15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- CGStmt.cpp - Emit LLVM Code from Statements ----------------------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This contains code to emit Stmt nodes as LLVM code. 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1455fc873017f10f6f566b182b70f6fc22aefa3464Chandler Carruth#include "CodeGenFunction.h" 15e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta#include "CGDebugInfo.h" 16e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta#include "CodeGenModule.h" 174b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne#include "TargetInfo.h" 18de7fb8413b13651fd85b7125d08b3c9ac2816d9dDaniel Dunbar#include "clang/AST/StmtVisitor.h" 197d22bf00dbabca86ba791f56a99e006181fa22ddChris Lattner#include "clang/Basic/PrettyStackTrace.h" 20fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson#include "clang/Basic/TargetInfo.h" 21fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson#include "llvm/ADT/StringExtras.h" 223b844ba7d5be205a9b4f5f0b0d1b7978977f4b8cChandler Carruth#include "llvm/IR/DataLayout.h" 233b844ba7d5be205a9b4f5f0b0d1b7978977f4b8cChandler Carruth#include "llvm/IR/InlineAsm.h" 243b844ba7d5be205a9b4f5f0b0d1b7978977f4b8cChandler Carruth#include "llvm/IR/Intrinsics.h" 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace CodeGen; 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// Statement Emission 305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 320912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarvoid CodeGenFunction::EmitStopPoint(const Stmt *S) { 33e896d98548b02223c7740d807a0aa6e20fba7079Anders Carlsson if (CGDebugInfo *DI = getDebugInfo()) { 3473fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher SourceLocation Loc; 3560e4fd95ed8c1f99697f4d9f73d07717b6e21048Devang Patel if (isa<DeclStmt>(S)) 3673fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher Loc = S->getLocEnd(); 3760e4fd95ed8c1f99697f4d9f73d07717b6e21048Devang Patel else 3873fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher Loc = S->getLocStart(); 3973fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher DI->EmitLocation(Builder, Loc); 400912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar } 410912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar} 420912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitStmt(const Stmt *S) { 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(S && "Null statement?"); 45a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar 46f9aac38d1290c17192a74b5bc2de52b9fb1a87caEric Christopher // These statements have their own debug info handling. 470912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (EmitSimpleStmt(S)) 480912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar return; 490912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 50d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // Check if we are generating unreachable code. 51d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar if (!HaveInsertPoint()) { 52d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // If so, and the statement doesn't contain a label, then we do not need to 53d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // generate actual code. This is safe because (1) the current point is 54d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // unreachable, so we don't need to execute the code, and (2) we've already 55d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // handled the statements which update internal data structures (like the 56d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // local variable map) which could be used by subsequent statements. 57d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar if (!ContainsLabel(S)) { 58d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // Verify that any decl statements were handled as simple, they may be in 59d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // scope of subsequent reachable statements. 60d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar assert(!isa<DeclStmt>(*S) && "Unexpected DeclStmt!"); 61d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar return; 62d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar } 63d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar 64d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // Otherwise, make a new block to hold the code. 65d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar EnsureInsertPoint(); 66d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar } 67d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar 680912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // Generate a stoppoint if we are emitting debug info. 690912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(S); 70e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (S->getStmtClass()) { 722a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::NoStmtClass: 732a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::CXXCatchStmtClass: 7428bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley case Stmt::SEHExceptStmtClass: 7528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley case Stmt::SEHFinallyStmtClass: 76ba0513de93d2fab6db5ab30b6927209fcc883078Douglas Gregor case Stmt::MSDependentExistsStmtClass: 772a41637a995affa1563f4d82a8b026e326a2faa0John McCall llvm_unreachable("invalid statement class to emit generically"); 782a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::NullStmtClass: 792a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::CompoundStmtClass: 802a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::DeclStmtClass: 812a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::LabelStmtClass: 82534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith case Stmt::AttributedStmtClass: 832a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::GotoStmtClass: 842a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::BreakStmtClass: 852a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::ContinueStmtClass: 862a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::DefaultStmtClass: 872a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::CaseStmtClass: 882a41637a995affa1563f4d82a8b026e326a2faa0John McCall llvm_unreachable("should have emitted these statements as simple"); 89cd5e60e1d4093b9a757cc85e35fccc093f8f8527Daniel Dunbar 902a41637a995affa1563f4d82a8b026e326a2faa0John McCall#define STMT(Type, Base) 912a41637a995affa1563f4d82a8b026e326a2faa0John McCall#define ABSTRACT_STMT(Op) 922a41637a995affa1563f4d82a8b026e326a2faa0John McCall#define EXPR(Type, Base) \ 932a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::Type##Class: 942a41637a995affa1563f4d82a8b026e326a2faa0John McCall#include "clang/AST/StmtNodes.inc" 95cd5b22e12b6513163dd131589746c194090f14e6John McCall { 96cd5b22e12b6513163dd131589746c194090f14e6John McCall // Remember the block we came in on. 97cd5b22e12b6513163dd131589746c194090f14e6John McCall llvm::BasicBlock *incoming = Builder.GetInsertBlock(); 98cd5b22e12b6513163dd131589746c194090f14e6John McCall assert(incoming && "expression emission must have an insertion point"); 99cd5b22e12b6513163dd131589746c194090f14e6John McCall 1002a41637a995affa1563f4d82a8b026e326a2faa0John McCall EmitIgnoredExpr(cast<Expr>(S)); 1011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 102cd5b22e12b6513163dd131589746c194090f14e6John McCall llvm::BasicBlock *outgoing = Builder.GetInsertBlock(); 103cd5b22e12b6513163dd131589746c194090f14e6John McCall assert(outgoing && "expression emission cleared block!"); 104cd5b22e12b6513163dd131589746c194090f14e6John McCall 105cd5b22e12b6513163dd131589746c194090f14e6John McCall // The expression emitters assume (reasonably!) that the insertion 106cd5b22e12b6513163dd131589746c194090f14e6John McCall // point is always set. To maintain that, the call-emission code 107cd5b22e12b6513163dd131589746c194090f14e6John McCall // for noreturn functions has to enter a new block with no 108cd5b22e12b6513163dd131589746c194090f14e6John McCall // predecessors. We want to kill that block and mark the current 109cd5b22e12b6513163dd131589746c194090f14e6John McCall // insertion point unreachable in the common case of a call like 110cd5b22e12b6513163dd131589746c194090f14e6John McCall // "exit();". Since expression emission doesn't otherwise create 111cd5b22e12b6513163dd131589746c194090f14e6John McCall // blocks with no predecessors, we can just test for that. 112cd5b22e12b6513163dd131589746c194090f14e6John McCall // However, we must be careful not to do this to our incoming 113cd5b22e12b6513163dd131589746c194090f14e6John McCall // block, because *statement* emission does sometimes create 114cd5b22e12b6513163dd131589746c194090f14e6John McCall // reachable blocks which will have no predecessors until later in 115cd5b22e12b6513163dd131589746c194090f14e6John McCall // the function. This occurs with, e.g., labels that are not 116cd5b22e12b6513163dd131589746c194090f14e6John McCall // reachable by fallthrough. 117cd5b22e12b6513163dd131589746c194090f14e6John McCall if (incoming != outgoing && outgoing->use_empty()) { 118cd5b22e12b6513163dd131589746c194090f14e6John McCall outgoing->eraseFromParent(); 119cd5b22e12b6513163dd131589746c194090f14e6John McCall Builder.ClearInsertionPoint(); 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 122cd5b22e12b6513163dd131589746c194090f14e6John McCall } 1232a41637a995affa1563f4d82a8b026e326a2faa0John McCall 1241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Stmt::IndirectGotoStmtClass: 1250ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar EmitIndirectGotoStmt(cast<IndirectGotoStmt>(*S)); break; 1265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::IfStmtClass: EmitIfStmt(cast<IfStmt>(*S)); break; 1285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::WhileStmtClass: EmitWhileStmt(cast<WhileStmt>(*S)); break; 1295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::DoStmtClass: EmitDoStmt(cast<DoStmt>(*S)); break; 1305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::ForStmtClass: EmitForStmt(cast<ForStmt>(*S)); break; 1311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::ReturnStmtClass: EmitReturnStmt(cast<ReturnStmt>(*S)); break; 133a4275d194b656867bdcdb725b2a7ba3251a1a638Daniel Dunbar 13451b09f2c528c8460b5465c676173324e44176d62Devang Patel case Stmt::SwitchStmtClass: EmitSwitchStmt(cast<SwitchStmt>(*S)); break; 135d1a8d2ef757ad880d48b2249a1619bf8209e9cf8Chad Rosier case Stmt::GCCAsmStmtClass: // Intentional fall-through. 136d1a8d2ef757ad880d48b2249a1619bf8209e9cf8Chad Rosier case Stmt::MSAsmStmtClass: EmitAsmStmt(cast<AsmStmt>(*S)); break; 1370a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar 1380a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtTryStmtClass: 13964d5d6c5903157c521af496479d06dc26032d718Anders Carlsson EmitObjCAtTryStmt(cast<ObjCAtTryStmt>(*S)); 1401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump break; 1410a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtCatchStmtClass: 142b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable( 143b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie "@catch statements should be handled by EmitObjCAtTryStmt"); 1440a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtFinallyStmtClass: 145b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable( 146b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie "@finally statements should be handled by EmitObjCAtTryStmt"); 1470a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtThrowStmtClass: 14864d5d6c5903157c521af496479d06dc26032d718Anders Carlsson EmitObjCAtThrowStmt(cast<ObjCAtThrowStmt>(*S)); 1490a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 1500a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtSynchronizedStmtClass: 15110cac6f7115b59a466bb8d2d51cdddeb38aadc37Chris Lattner EmitObjCAtSynchronizedStmt(cast<ObjCAtSynchronizedStmt>(*S)); 1520a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 1531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Stmt::ObjCForCollectionStmtClass: 1543d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson EmitObjCForCollectionStmt(cast<ObjCForCollectionStmt>(*S)); 1550a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 156f85e193739c953358c865005855253af4f68a497John McCall case Stmt::ObjCAutoreleasePoolStmtClass: 157f85e193739c953358c865005855253af4f68a497John McCall EmitObjCAutoreleasePoolStmt(cast<ObjCAutoreleasePoolStmt>(*S)); 158f85e193739c953358c865005855253af4f68a497John McCall break; 1596f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1606815e941998659a55c20c147861b0f437928c3d8Anders Carlsson case Stmt::CXXTryStmtClass: 1616815e941998659a55c20c147861b0f437928c3d8Anders Carlsson EmitCXXTryStmt(cast<CXXTryStmt>(*S)); 1626815e941998659a55c20c147861b0f437928c3d8Anders Carlsson break; 163ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith case Stmt::CXXForRangeStmtClass: 164ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitCXXForRangeStmt(cast<CXXForRangeStmt>(*S)); 16528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley case Stmt::SEHTryStmtClass: 16628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley // FIXME Not yet implemented 167ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith break; 1685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1710912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarbool CodeGenFunction::EmitSimpleStmt(const Stmt *S) { 1720912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar switch (S->getStmtClass()) { 1730912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar default: return false; 1740912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::NullStmtClass: break; 1750912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::CompoundStmtClass: EmitCompoundStmt(cast<CompoundStmt>(*S)); break; 176d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar case Stmt::DeclStmtClass: EmitDeclStmt(cast<DeclStmt>(*S)); break; 1770912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::LabelStmtClass: EmitLabelStmt(cast<LabelStmt>(*S)); break; 178534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith case Stmt::AttributedStmtClass: 179534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith EmitAttributedStmt(cast<AttributedStmt>(*S)); break; 1800912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::GotoStmtClass: EmitGotoStmt(cast<GotoStmt>(*S)); break; 1810912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::BreakStmtClass: EmitBreakStmt(cast<BreakStmt>(*S)); break; 1820912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::ContinueStmtClass: EmitContinueStmt(cast<ContinueStmt>(*S)); break; 1830912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::DefaultStmtClass: EmitDefaultStmt(cast<DefaultStmt>(*S)); break; 1840912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::CaseStmtClass: EmitCaseStmt(cast<CaseStmt>(*S)); break; 1850912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar } 1860912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 1870912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar return true; 1880912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar} 1890912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 1903379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner/// EmitCompoundStmt - Emit a compound statement {..} node. If GetLast is true, 1913379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner/// this captures the expression result of the last sub-statement and returns it 1923379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner/// (for use by the statement expression extension). 1939b65551d0b387a7597fb39356a4d8ef10046445eChris LattnerRValue CodeGenFunction::EmitCompoundStmt(const CompoundStmt &S, bool GetLast, 194558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot AggSlot) { 1957d22bf00dbabca86ba791f56a99e006181fa22ddChris Lattner PrettyStackTraceLoc CrashInfo(getContext().getSourceManager(),S.getLBracLoc(), 1967d22bf00dbabca86ba791f56a99e006181fa22ddChris Lattner "LLVM IR generation of compound statement ('{}')"); 1971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 198fdc5d565b30bd2009ec98aac4b5846a740aff767Eric Christopher // Keep track of the current cleanup stack depth, including debug scopes. 199fdc5d565b30bd2009ec98aac4b5846a740aff767Eric Christopher LexicalScope Scope(*this, S.getSourceRange()); 2001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 201a6504853d297c30cfa271f4710af5a3d5db59449David Blaikie return EmitCompoundStmtWithoutScope(S, GetLast, AggSlot); 202a6504853d297c30cfa271f4710af5a3d5db59449David Blaikie} 203a6504853d297c30cfa271f4710af5a3d5db59449David Blaikie 204a6504853d297c30cfa271f4710af5a3d5db59449David BlaikieRValue CodeGenFunction::EmitCompoundStmtWithoutScope(const CompoundStmt &S, bool GetLast, 205a6504853d297c30cfa271f4710af5a3d5db59449David Blaikie AggValueSlot AggSlot) { 206a6504853d297c30cfa271f4710af5a3d5db59449David Blaikie 2073379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner for (CompoundStmt::const_body_iterator I = S.body_begin(), 2083379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner E = S.body_end()-GetLast; I != E; ++I) 2095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitStmt(*I); 210e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta 21117d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson RValue RV; 2121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!GetLast) 21317d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson RV = RValue::get(0); 21417d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson else { 2151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We have to special case labels here. They are statements, but when put 21617d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson // at the end of a statement expression, they yield the value of their 21717d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson // subexpression. Handle this by walking through all labels we encounter, 21817d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson // emitting them before we evaluate the subexpr. 21917d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson const Stmt *LastStmt = S.body_back(); 22017d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson while (const LabelStmt *LS = dyn_cast<LabelStmt>(LastStmt)) { 221ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner EmitLabel(LS->getDecl()); 22217d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson LastStmt = LS->getSubStmt(); 22317d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson } 2241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22517d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson EnsureInsertPoint(); 2261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 227558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall RV = EmitAnyExpr(cast<Expr>(LastStmt), AggSlot); 22891d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner } 229a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar 23017d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson return RV; 2315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 233aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbarvoid CodeGenFunction::SimplifyForwardingBlocks(llvm::BasicBlock *BB) { 234aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar llvm::BranchInst *BI = dyn_cast<llvm::BranchInst>(BB->getTerminator()); 2351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 236aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // If there is a cleanup stack, then we it isn't worth trying to 237aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // simplify this block (we would need to remove it from the scope map 238aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // and cleanup entry). 239f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (!EHStack.empty()) 240aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar return; 241aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar 242aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // Can only simplify direct branches. 243aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar if (!BI || !BI->isUnconditional()) 244aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar return; 245aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar 2463d7c780d93ebcb84a1224de8c44835ea43e82b15Eli Friedman // Can only simplify empty blocks. 2473d7c780d93ebcb84a1224de8c44835ea43e82b15Eli Friedman if (BI != BB->begin()) 2483d7c780d93ebcb84a1224de8c44835ea43e82b15Eli Friedman return; 2493d7c780d93ebcb84a1224de8c44835ea43e82b15Eli Friedman 250aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar BB->replaceAllUsesWith(BI->getSuccessor(0)); 251aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar BI->eraseFromParent(); 252aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar BB->eraseFromParent(); 253aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar} 254aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar 255a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbarvoid CodeGenFunction::EmitBlock(llvm::BasicBlock *BB, bool IsFinished) { 256548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); 257548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall 258d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // Fall out of the current block (if necessary). 259d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar EmitBranch(BB); 260a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar 261a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar if (IsFinished && BB->use_empty()) { 262a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar delete BB; 263a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar return; 264a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar } 265a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar 266839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall // Place the block after the current block, if possible, or else at 267839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall // the end of the function. 268548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall if (CurBB && CurBB->getParent()) 269548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall CurFn->getBasicBlockList().insertAfter(CurBB, BB); 270839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall else 271839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall CurFn->getBasicBlockList().push_back(BB); 272d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar Builder.SetInsertPoint(BB); 273d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar} 274d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar 275d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbarvoid CodeGenFunction::EmitBranch(llvm::BasicBlock *Target) { 276d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // Emit a branch from the current block to the target one if this 277d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // was a real block. If this was just a fall-through block after a 278d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // terminator, don't emit it. 279d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); 280d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar 281d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar if (!CurBB || CurBB->getTerminator()) { 282d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // If there is no insert point or the previous block is already 283d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // terminated, don't touch it. 2845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 2855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, create a fall-through branch. 286d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar Builder.CreateBr(Target); 2875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2885e08ad3cc62ab94649959ae227a9a411a729bf49Daniel Dunbar 2895e08ad3cc62ab94649959ae227a9a411a729bf49Daniel Dunbar Builder.ClearInsertionPoint(); 2905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 292777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCallvoid CodeGenFunction::EmitBlockAfterUses(llvm::BasicBlock *block) { 293777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall bool inserted = false; 294777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall for (llvm::BasicBlock::use_iterator 295777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall i = block->use_begin(), e = block->use_end(); i != e; ++i) { 296777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall if (llvm::Instruction *insn = dyn_cast<llvm::Instruction>(*i)) { 297777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall CurFn->getBasicBlockList().insertAfter(insn->getParent(), block); 298777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall inserted = true; 299777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall break; 300777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall } 301777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall } 302777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall 303777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall if (!inserted) 304777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall CurFn->getBasicBlockList().push_back(block); 305777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall 306777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall Builder.SetInsertPoint(block); 307777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall} 308777d6e56ad9b1fed9866daf3ee6486d85c5b7d32John McCall 309f1549f66a8216a78112286e3978cea2c29d6334cJohn McCallCodeGenFunction::JumpDest 310ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris LattnerCodeGenFunction::getJumpDestForLabel(const LabelDecl *D) { 311ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner JumpDest &Dest = LabelMap[D]; 312ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (Dest.isValid()) return Dest; 313f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 314f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Create, but don't insert, the new block. 315ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Dest = JumpDest(createBasicBlock(D->getName()), 316ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EHScopeStack::stable_iterator::invalid(), 317ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall NextCleanupDestIndex++); 318f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall return Dest; 319f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall} 320f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 321ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattnervoid CodeGenFunction::EmitLabel(const LabelDecl *D) { 322ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner JumpDest &Dest = LabelMap[D]; 323f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 324ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall // If we didn't need a forward reference to this label, just go 325f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // ahead and create a destination at the current scope. 326ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (!Dest.isValid()) { 327ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Dest = getJumpDestInCurrentScope(D->getName()); 328f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 329f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Otherwise, we need to give this label a target depth and remove 330f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // it from the branch-fixups list. 331f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } else { 332ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall assert(!Dest.getScopeDepth().isValid() && "already emitted label!"); 333ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall Dest = JumpDest(Dest.getBlock(), 334ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EHStack.stable_begin(), 335ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall Dest.getDestIndex()); 336f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 337ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall ResolveBranchFixups(Dest.getBlock()); 338f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 339f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 340ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(Dest.getBlock()); 34191d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner} 34291d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner 34391d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner 34491d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattnervoid CodeGenFunction::EmitLabelStmt(const LabelStmt &S) { 345ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner EmitLabel(S.getDecl()); 3465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitStmt(S.getSubStmt()); 3475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 349534986f2b21e6050bf00163cd6423fd92155a6edRichard Smithvoid CodeGenFunction::EmitAttributedStmt(const AttributedStmt &S) { 350534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith EmitStmt(S.getSubStmt()); 351534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith} 352534986f2b21e6050bf00163cd6423fd92155a6edRichard Smith 3535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitGotoStmt(const GotoStmt &S) { 3540912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // If this code is reachable then emit a stop point (if generating 3550912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // debug info). We have to do this ourselves because we are on the 3560912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // "simple" statement path. 3570912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (HaveInsertPoint()) 3580912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(&S); 35936a2ada69fdb457b0e46d0ef452c150b360d8888Mike Stump 360f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranchThroughCleanup(getJumpDestForLabel(S.getLabel())); 3615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3633d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3640ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbarvoid CodeGenFunction::EmitIndirectGotoStmt(const IndirectGotoStmt &S) { 365ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner if (const LabelDecl *Target = S.getConstantTarget()) { 36695c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall EmitBranchThroughCleanup(getJumpDestForLabel(Target)); 36795c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall return; 36895c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall } 36995c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall 37049c952f853fe2d15dd9c9ff2a29c696bd18fca13Chris Lattner // Ensure that we have an i8* for our PHI node. 371d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner llvm::Value *V = Builder.CreateBitCast(EmitScalarExpr(S.getTarget()), 372d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Int8PtrTy, "addr"); 3733d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); 3743d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3753d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner // Get the basic block for the indirect goto. 3763d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner llvm::BasicBlock *IndGotoBB = GetIndirectGotoBlock(); 3776f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 3783d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner // The first instruction in the block has to be the PHI for the switch dest, 3793d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner // add an entry for this branch. 3803d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner cast<llvm::PHINode>(IndGotoBB->begin())->addIncoming(V, CurBB); 3816f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 3823d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner EmitBranch(IndGotoBB); 3830ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar} 3840ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 38562b72f642207ba2ba433d686df924dc9594e9897Chris Lattnervoid CodeGenFunction::EmitIfStmt(const IfStmt &S) { 3865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.1: The first substatement is executed if the expression compares 3875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // unequal to 0. The condition must be a scalar type. 388f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 38901234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor 3908cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor if (S.getConditionVariable()) 391b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 3921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3939bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // If the condition constant folds and can be elided, try to avoid emitting 3949bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // the condition and the dead arm of the if/else. 395c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner bool CondConstant; 396c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner if (ConstantFoldsToSimpleInteger(S.getCond(), CondConstant)) { 39762b72f642207ba2ba433d686df924dc9594e9897Chris Lattner // Figure out which block (then or else) is executed. 398c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner const Stmt *Executed = S.getThen(); 399c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner const Stmt *Skipped = S.getElse(); 400c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner if (!CondConstant) // Condition false? 40162b72f642207ba2ba433d686df924dc9594e9897Chris Lattner std::swap(Executed, Skipped); 4021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 40362b72f642207ba2ba433d686df924dc9594e9897Chris Lattner // If the skipped block has no labels in it, just emit the executed block. 40462b72f642207ba2ba433d686df924dc9594e9897Chris Lattner // This avoids emitting dead code and simplifies the CFG substantially. 4059bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner if (!ContainsLabel(Skipped)) { 40601234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor if (Executed) { 407f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ExecutedScope(*this); 40862b72f642207ba2ba433d686df924dc9594e9897Chris Lattner EmitStmt(Executed); 40901234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor } 41062b72f642207ba2ba433d686df924dc9594e9897Chris Lattner return; 41162b72f642207ba2ba433d686df924dc9594e9897Chris Lattner } 41262b72f642207ba2ba433d686df924dc9594e9897Chris Lattner } 4139bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner 4149bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // Otherwise, the condition did not fold, or we couldn't elide it. Just emit 4159bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // the conditional branch. 416781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar llvm::BasicBlock *ThenBlock = createBasicBlock("if.then"); 417781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar llvm::BasicBlock *ContBlock = createBasicBlock("if.end"); 418781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar llvm::BasicBlock *ElseBlock = ContBlock; 4195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (S.getElse()) 420781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar ElseBlock = createBasicBlock("if.else"); 421781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar EmitBranchOnBoolExpr(S.getCond(), ThenBlock, ElseBlock); 4221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the 'then' code. 42401234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor EmitBlock(ThenBlock); 42501234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor { 426f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ThenScope(*this); 42701234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor EmitStmt(S.getThen()); 42801234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor } 429d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar EmitBranch(ContBlock); 4301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the 'else' code if present. 4325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (const Stmt *Else = S.getElse()) { 433acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel // There is no need to emit line number for unconditional branch. 434acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel if (getDebugInfo()) 435acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel Builder.SetCurrentDebugLocation(llvm::DebugLoc()); 4365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitBlock(ElseBlock); 43701234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor { 438f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ElseScope(*this); 43901234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor EmitStmt(Else); 44001234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor } 441acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel // There is no need to emit line number for unconditional branch. 442acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel if (getDebugInfo()) 443acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel Builder.SetCurrentDebugLocation(llvm::DebugLoc()); 444d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar EmitBranch(ContBlock); 4455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the continuation block for code after the if. 448c22d665ede76f70228055d638a087f4bd438292dDaniel Dunbar EmitBlock(ContBlock, true); 4495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 4505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitWhileStmt(const WhileStmt &S) { 452f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Emit the header for the loop, which will also become 453f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // the continue target. 454f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopHeader = getJumpDestInCurrentScope("while.cond"); 455ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopHeader.getBlock()); 456f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 457f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Create an exit block for when the condition fails, which will 458f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // also become the break target. 459f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopExit = getJumpDestInCurrentScope("while.end"); 46072cac2ccce8058833f56358e3391e28a8ddeeaa4Mike Stump 46172cac2ccce8058833f56358e3391e28a8ddeeaa4Mike Stump // Store the blocks to use for break and continue. 462f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(LoopExit, LoopHeader)); 4631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4645656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // C++ [stmt.while]p2: 4655656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // When the condition of a while statement is a declaration, the 4665656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // scope of the variable that is declared extends from its point 4675656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // of declaration (3.3.2) to the end of the while statement. 4685656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // [...] 4695656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // The object created in a condition is destroyed and created 4705656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // with each iteration of the loop. 471f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 4725656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 473f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (S.getConditionVariable()) 474b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 4756f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 47616b16206741f5139c4ad870632db8f9ea4c6c943Mike Stump // Evaluate the conditional in the while header. C99 6.8.5.1: The 47716b16206741f5139c4ad870632db8f9ea4c6c943Mike Stump // evaluation of the controlling expression takes place before each 47816b16206741f5139c4ad870632db8f9ea4c6c943Mike Stump // execution of the loop body. 4795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond()); 4806f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 4812c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel // while(1) is common, avoid extra exit blocks. Be sure 4825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // to correctly handle break/continue though. 4832c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel bool EmitBoolCondBranch = true; 4841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (llvm::ConstantInt *C = dyn_cast<llvm::ConstantInt>(BoolCondVal)) 4852c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel if (C->isOne()) 4862c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel EmitBoolCondBranch = false; 4871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // As long as the condition is true, go to the loop body. 489f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall llvm::BasicBlock *LoopBody = createBasicBlock("while.body"); 490f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (EmitBoolCondBranch) { 491ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall llvm::BasicBlock *ExitBlock = LoopExit.getBlock(); 492f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (ConditionScope.requiresCleanups()) 493f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ExitBlock = createBasicBlock("while.exit"); 494f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 495f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall Builder.CreateCondBr(BoolCondVal, LoopBody, ExitBlock); 496f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 497ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (ExitBlock != LoopExit.getBlock()) { 498f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(ExitBlock); 499f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranchThroughCleanup(LoopExit); 500f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 501f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 5026f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 503f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Emit the loop body. We have to emit this in a cleanup scope 504f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // because it might be a singleton DeclStmt. 5055656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor { 506f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope BodyScope(*this); 5075656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor EmitBlock(LoopBody); 5085656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor EmitStmt(S.getBody()); 5095656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 510da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 5111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump BreakContinueStack.pop_back(); 5121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 513f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Immediately force cleanup. 514f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ConditionScope.ForceCleanup(); 5155656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 516f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Branch to the loop header again. 517ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBranch(LoopHeader.getBlock()); 5181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the exit block. 520ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopExit.getBlock(), true); 5215656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 522aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // The LoopHeader typically is just a branch if we skipped emitting 523aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // a branch, try to erase it. 524f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (!EmitBoolCondBranch) 525ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall SimplifyForwardingBlocks(LoopHeader.getBlock()); 5265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitDoStmt(const DoStmt &S) { 529f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopExit = getJumpDestInCurrentScope("do.end"); 530f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopCond = getJumpDestInCurrentScope("do.cond"); 5311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 532da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner // Store the blocks to use for break and continue. 533f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(LoopExit, LoopCond)); 5341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 535f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Emit the body of the loop. 536f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall llvm::BasicBlock *LoopBody = createBasicBlock("do.body"); 537f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(LoopBody); 538f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall { 539f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope BodyScope(*this); 540f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitStmt(S.getBody()); 541f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 5421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 543e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson BreakContinueStack.pop_back(); 5441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 545ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopCond.getBlock()); 5461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.5.2: "The evaluation of the controlling expression takes place 5485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // after each execution of the loop body." 5491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Evaluate the conditional in the while header. 5515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.5p2/p4: The first substatement is executed if the expression 5525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // compares unequal to 0. The condition must be a scalar type. 5535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond()); 55405f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel 55505f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel // "do {} while (0)" is common in macros, avoid extra blocks. Be sure 55605f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel // to correctly handle break/continue though. 55705f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel bool EmitBoolCondBranch = true; 5581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (llvm::ConstantInt *C = dyn_cast<llvm::ConstantInt>(BoolCondVal)) 55905f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel if (C->isZero()) 56005f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel EmitBoolCondBranch = false; 56105f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel 5625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // As long as the condition is true, iterate the loop. 56305f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel if (EmitBoolCondBranch) 564ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall Builder.CreateCondBr(BoolCondVal, LoopBody, LoopExit.getBlock()); 5651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the exit block. 567ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopExit.getBlock()); 56805f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel 569aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // The DoCond block typically is just a branch if we skipped 570aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // emitting a branch, try to erase it. 571aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar if (!EmitBoolCondBranch) 572ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall SimplifyForwardingBlocks(LoopCond.getBlock()); 5735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitForStmt(const ForStmt &S) { 576f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopExit = getJumpDestInCurrentScope("for.end"); 577f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 578f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ForScope(*this); 579da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 5800554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel CGDebugInfo *DI = getDebugInfo(); 58173fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher if (DI) 58273fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher DI->EmitLexicalBlockStart(Builder, S.getSourceRange().getBegin()); 5830554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel 5845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Evaluate the first part before the loop. 5855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (S.getInit()) 5865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitStmt(S.getInit()); 5875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Start the loop with a block that tests the condition. 589f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If there's an increment, the continue scope will be overwritten 590f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // later. 591f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest Continue = getJumpDestInCurrentScope("for.cond"); 592ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall llvm::BasicBlock *CondBlock = Continue.getBlock(); 5935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitBlock(CondBlock); 5945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 595d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor // Create a cleanup scope for the condition variable cleanups. 596f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 5976f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 598d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor llvm::Value *BoolCondVal = 0; 5995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (S.getCond()) { 60099e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor // If the for statement has a condition scope, emit the local variable 60199e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor // declaration. 602ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall llvm::BasicBlock *ExitBlock = LoopExit.getBlock(); 603d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor if (S.getConditionVariable()) { 604b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 605d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor } 606f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 607f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If there are any cleanups between here and the loop-exit scope, 608f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // create a block to stage a loop exit along. 609f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (ForScope.requiresCleanups()) 610f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ExitBlock = createBasicBlock("for.cond.cleanup"); 6116f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 61231a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // As long as the condition is true, iterate the loop. 6139615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ForBody = createBasicBlock("for.body"); 6141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.5p2/p4: The first substatement is executed if the expression 6165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // compares unequal to 0. The condition must be a scalar type. 617d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor BoolCondVal = EvaluateExprAsBool(S.getCond()); 618f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall Builder.CreateCondBr(BoolCondVal, ForBody, ExitBlock); 619f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 620ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (ExitBlock != LoopExit.getBlock()) { 621f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(ExitBlock); 622f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranchThroughCleanup(LoopExit); 623f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 6241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitBlock(ForBody); 6265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 6275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Treat it as a non-zero constant. Don't even create a new block for the 6285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // body, just fall into it. 6295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the for loop doesn't have an increment we can just use the 632f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // condition as the continue block. Otherwise we'll need to create 633f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // a block for it (in the current scope, i.e. in the scope of the 634f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // condition), and that we will become our continue block. 635da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner if (S.getInc()) 636f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall Continue = getJumpDestInCurrentScope("for.inc"); 6371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 638da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner // Store the blocks to use for break and continue. 639f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(LoopExit, Continue)); 6403e9da66ac7e88d64d30ee777588677320660cf84Mike Stump 641d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor { 642d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor // Create a separate cleanup scope for the body, in case it is not 643d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor // a compound statement. 644f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope BodyScope(*this); 645d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor EmitStmt(S.getBody()); 646d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor } 647da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 6485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If there is an increment, emit it next. 649ad12b6d643aba6c36f5cec4c9beb4977a12eace4Daniel Dunbar if (S.getInc()) { 650ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(Continue.getBlock()); 651883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner EmitStmt(S.getInc()); 652ad12b6d643aba6c36f5cec4c9beb4977a12eace4Daniel Dunbar } 6531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 65445d3fe1898d3726d269a0bd2ccb8527102e29d79Douglas Gregor BreakContinueStack.pop_back(); 655f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 656f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ConditionScope.ForceCleanup(); 657f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranch(CondBlock); 658f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 659f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ForScope.ForceCleanup(); 660f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 66173fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher if (DI) 66273fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher DI->EmitLexicalBlockEnd(Builder, S.getSourceRange().getEnd()); 6635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 664da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner // Emit the fall-through block. 665ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopExit.getBlock(), true); 6665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 668ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithvoid CodeGenFunction::EmitCXXForRangeStmt(const CXXForRangeStmt &S) { 669ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith JumpDest LoopExit = getJumpDestInCurrentScope("for.end"); 670ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 671ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RunCleanupsScope ForScope(*this); 672ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 673ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CGDebugInfo *DI = getDebugInfo(); 67473fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher if (DI) 67573fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher DI->EmitLexicalBlockStart(Builder, S.getSourceRange().getBegin()); 676ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 677ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Evaluate the first pieces before the loop. 678ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getRangeStmt()); 679ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getBeginEndStmt()); 680ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 681ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Start the loop with a block that tests the condition. 682ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // If there's an increment, the continue scope will be overwritten 683ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // later. 684ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::BasicBlock *CondBlock = createBasicBlock("for.cond"); 685ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(CondBlock); 686ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 687ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // If there are any cleanups between here and the loop-exit scope, 688ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // create a block to stage a loop exit along. 689ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::BasicBlock *ExitBlock = LoopExit.getBlock(); 690ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (ForScope.requiresCleanups()) 691ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExitBlock = createBasicBlock("for.cond.cleanup"); 6926f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 693ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // The loop body, consisting of the specified body and the loop variable. 694ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::BasicBlock *ForBody = createBasicBlock("for.body"); 695ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 696ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // The body is executed if the expression, contextually converted 697ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // to bool, is true. 698ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond()); 699ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Builder.CreateCondBr(BoolCondVal, ForBody, ExitBlock); 700ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 701ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (ExitBlock != LoopExit.getBlock()) { 702ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(ExitBlock); 703ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBranchThroughCleanup(LoopExit); 704ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 705ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 706ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(ForBody); 707ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 708ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Create a block for the increment. In case of a 'continue', we jump there. 709ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith JumpDest Continue = getJumpDestInCurrentScope("for.inc"); 710ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 711ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Store the blocks to use for break and continue. 712ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BreakContinueStack.push_back(BreakContinue(LoopExit, Continue)); 713ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 714ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith { 715ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Create a separate cleanup scope for the loop variable and body. 716ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RunCleanupsScope BodyScope(*this); 717ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getLoopVarStmt()); 718ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getBody()); 719ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 720ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 721ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // If there is an increment, emit it next. 722ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(Continue.getBlock()); 723ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getInc()); 724ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 725ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BreakContinueStack.pop_back(); 726ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 727ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBranch(CondBlock); 728ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 729ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ForScope.ForceCleanup(); 730ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 73173fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher if (DI) 73273fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher DI->EmitLexicalBlockEnd(Builder, S.getSourceRange().getEnd()); 733ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 734ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Emit the fall-through block. 735ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(LoopExit.getBlock(), true); 736ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 737ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 73829e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbarvoid CodeGenFunction::EmitReturnOfRValue(RValue RV, QualType Ty) { 73929e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar if (RV.isScalar()) { 74029e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar Builder.CreateStore(RV.getScalarVal(), ReturnValue); 74129e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar } else if (RV.isAggregate()) { 742649b4a1a9b5e6f768ca0cb84bd97b00f51083e15Chad Rosier EmitAggregateCopy(ReturnValue, RV.getAggregateAddr(), Ty); 74329e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar } else { 7449d232c884ea9872d6555df0fd7359699819bc1f1John McCall EmitStoreOfComplex(RV.getComplexVal(), 7459d232c884ea9872d6555df0fd7359699819bc1f1John McCall MakeNaturalAlignAddrLValue(ReturnValue, Ty), 7469d232c884ea9872d6555df0fd7359699819bc1f1John McCall /*init*/ true); 74729e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar } 74882d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(ReturnBlock); 74929e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar} 75029e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar 7515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EmitReturnStmt - Note that due to GCC extensions, this can have an operand 7525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// if the function returns void, or may be missing one if the function returns 7535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// non-void. Fun stuff :). 7545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitReturnStmt(const ReturnStmt &S) { 7555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the result value, even if unused, to evalute the side effects. 7565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const Expr *RV = S.getRetValue(); 7571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7589f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall // Treat block literals in a return expression as if they appeared 7599f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall // in their own scope. This permits a small, easily-implemented 7609f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall // exception to our over-conservative rules about not jumping to 7619f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall // statements following block literals with non-trivial cleanups. 7629f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall RunCleanupsScope cleanupScope(*this); 7639f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall if (const ExprWithCleanups *cleanups = 7649f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall dyn_cast_or_null<ExprWithCleanups>(RV)) { 7659f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall enterFullExpression(cleanups); 7669f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall RV = cleanups->getSubExpr(); 7679f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall } 7689f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall 7695ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // FIXME: Clean this up by using an LValue for ReturnTemp, 7705ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // EmitStoreThroughLValue, and EmitAnyExpr. 771d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor if (S.getNRVOCandidate() && S.getNRVOCandidate()->isNRVOVariable() && 772d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !Target.useGlobalsForAutomaticVariables()) { 773d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor // Apply the named return value optimization for this return statement, 774d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor // which means doing nothing: the appropriate result has already been 775d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor // constructed into the NRVO variable. 7766f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 7773d91bbcdab155181556969cad6ec97014405acedDouglas Gregor // If there is an NRVO flag for this variable, set it to 1 into indicate 7783d91bbcdab155181556969cad6ec97014405acedDouglas Gregor // that the cleanup code should not destroy the variable. 779d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall if (llvm::Value *NRVOFlag = NRVOFlags[S.getNRVOCandidate()]) 780d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Builder.CreateStore(Builder.getTrue(), NRVOFlag); 781d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor } else if (!ReturnValue) { 7825ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // Make sure not to return anything, but evaluate the expression 7835ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // for side effects. 7845ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar if (RV) 785144ac61f9005a0da4327d4e62a4c453923b7bc0cEli Friedman EmitAnyExpr(RV); 7865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else if (RV == 0) { 7875ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // Do nothing (return value is left uninitialized) 788d54b6ac2f4f6f0bd0076cbfa885b57277066f06cEli Friedman } else if (FnRetTy->isReferenceType()) { 789d54b6ac2f4f6f0bd0076cbfa885b57277066f06cEli Friedman // If this function returns a reference, take the address of the expression 790d54b6ac2f4f6f0bd0076cbfa885b57277066f06cEli Friedman // rather than the value. 79132f36baa6c8d491c374af622b4e3ac28d597453cAnders Carlsson RValue Result = EmitReferenceBindingToExpr(RV, /*InitializedDecl=*/0); 79233fd1fc1814a5573c972840d49317989e20deaceDouglas Gregor Builder.CreateStore(Result.getScalarVal(), ReturnValue); 7935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 7949d232c884ea9872d6555df0fd7359699819bc1f1John McCall switch (getEvaluationKind(RV->getType())) { 7959d232c884ea9872d6555df0fd7359699819bc1f1John McCall case TEK_Scalar: 7969d232c884ea9872d6555df0fd7359699819bc1f1John McCall Builder.CreateStore(EmitScalarExpr(RV), ReturnValue); 7979d232c884ea9872d6555df0fd7359699819bc1f1John McCall break; 7989d232c884ea9872d6555df0fd7359699819bc1f1John McCall case TEK_Complex: 7999d232c884ea9872d6555df0fd7359699819bc1f1John McCall EmitComplexExprIntoLValue(RV, 8009d232c884ea9872d6555df0fd7359699819bc1f1John McCall MakeNaturalAlignAddrLValue(ReturnValue, RV->getType()), 8019d232c884ea9872d6555df0fd7359699819bc1f1John McCall /*isInit*/ true); 8029d232c884ea9872d6555df0fd7359699819bc1f1John McCall break; 8039d232c884ea9872d6555df0fd7359699819bc1f1John McCall case TEK_Aggregate: { 8049d232c884ea9872d6555df0fd7359699819bc1f1John McCall CharUnits Alignment = getContext().getTypeAlignInChars(RV->getType()); 8059d232c884ea9872d6555df0fd7359699819bc1f1John McCall EmitAggExpr(RV, AggValueSlot::forAddr(ReturnValue, Alignment, 8069d232c884ea9872d6555df0fd7359699819bc1f1John McCall Qualifiers(), 8079d232c884ea9872d6555df0fd7359699819bc1f1John McCall AggValueSlot::IsDestructed, 8089d232c884ea9872d6555df0fd7359699819bc1f1John McCall AggValueSlot::DoesNotNeedGCBarriers, 8099d232c884ea9872d6555df0fd7359699819bc1f1John McCall AggValueSlot::IsNotAliased)); 8109d232c884ea9872d6555df0fd7359699819bc1f1John McCall break; 8119d232c884ea9872d6555df0fd7359699819bc1f1John McCall } 8129d232c884ea9872d6555df0fd7359699819bc1f1John McCall } 8135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 814144ac61f9005a0da4327d4e62a4c453923b7bc0cEli Friedman 8159f357de8d5823f9b13cf33ad1f6af1dd69b7669fJohn McCall cleanupScope.ForceCleanup(); 81682d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(ReturnBlock); 8175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitDeclStmt(const DeclStmt &S) { 8209198126067a447f8aaccf9fff09be294c8bcb81eDevang Patel // As long as debug info is modeled with instructions, we have to ensure we 8219198126067a447f8aaccf9fff09be294c8bcb81eDevang Patel // have a place to insert here and write the stop point here. 8222b124ea9d2c27c6d002ecd4623f6321e305d907eEric Christopher if (HaveInsertPoint()) 8239198126067a447f8aaccf9fff09be294c8bcb81eDevang Patel EmitStopPoint(&S); 8249198126067a447f8aaccf9fff09be294c8bcb81eDevang Patel 825e4ea1f42c97a436df3e0ae8e129e6bc624ee6790Ted Kremenek for (DeclStmt::const_decl_iterator I = S.decl_begin(), E = S.decl_end(); 826e4ea1f42c97a436df3e0ae8e129e6bc624ee6790Ted Kremenek I != E; ++I) 827e4ea1f42c97a436df3e0ae8e129e6bc624ee6790Ted Kremenek EmitDecl(**I); 8286fa5f0943a84233b2e1ec9716eae55643225bfd4Chris Lattner} 829da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 8300912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarvoid CodeGenFunction::EmitBreakStmt(const BreakStmt &S) { 831da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner assert(!BreakContinueStack.empty() && "break stmt not in a loop or switch!"); 832da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 8330912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // If this code is reachable then emit a stop point (if generating 8340912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // debug info). We have to do this ourselves because we are on the 8350912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // "simple" statement path. 8360912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (HaveInsertPoint()) 8370912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(&S); 838ec9771d57f94cc204491b3174e88069d08cdd684Mike Stump 839f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest Block = BreakContinueStack.back().BreakBlock; 84082d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(Block); 841da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner} 842da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 8430912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarvoid CodeGenFunction::EmitContinueStmt(const ContinueStmt &S) { 844da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner assert(!BreakContinueStack.empty() && "continue stmt not in a loop!"); 845da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 8460912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // If this code is reachable then emit a stop point (if generating 8470912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // debug info). We have to do this ourselves because we are on the 8480912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // "simple" statement path. 8490912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (HaveInsertPoint()) 8500912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(&S); 851ec9771d57f94cc204491b3174e88069d08cdd684Mike Stump 852f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest Block = BreakContinueStack.back().ContinueBlock; 85382d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(Block); 854da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner} 85551b09f2c528c8460b5465c676173324e44176d62Devang Patel 856c049e4f406a7f7179eba98659044a32508e53289Devang Patel/// EmitCaseStmtRange - If case statement range is not too big then 857c049e4f406a7f7179eba98659044a32508e53289Devang Patel/// add multiple cases to switch instruction, one for each value within 858c049e4f406a7f7179eba98659044a32508e53289Devang Patel/// the range. If range is too big then emit "if" condition check. 859c049e4f406a7f7179eba98659044a32508e53289Devang Patelvoid CodeGenFunction::EmitCaseStmtRange(const CaseStmt &S) { 8604efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar assert(S.getRHS() && "Expected RHS value in CaseStmt"); 861c049e4f406a7f7179eba98659044a32508e53289Devang Patel 862a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LHS = S.getLHS()->EvaluateKnownConstInt(getContext()); 863a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt RHS = S.getRHS()->EvaluateKnownConstInt(getContext()); 8644efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar 86516f23570999cac1fa13597386938450843003840Daniel Dunbar // Emit the code for this case. We do this first to make sure it is 86616f23570999cac1fa13597386938450843003840Daniel Dunbar // properly chained from our predecessor before generating the 86716f23570999cac1fa13597386938450843003840Daniel Dunbar // switch machinery to enter this block. 868f84dcda7e2ab2f6d5be5a8c52d22ef4c442dd762Daniel Dunbar EmitBlock(createBasicBlock("sw.bb")); 86916f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *CaseDest = Builder.GetInsertBlock(); 87016f23570999cac1fa13597386938450843003840Daniel Dunbar EmitStmt(S.getSubStmt()); 87116f23570999cac1fa13597386938450843003840Daniel Dunbar 8724efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar // If range is empty, do nothing. 8734efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar if (LHS.isSigned() ? RHS.slt(LHS) : RHS.ult(LHS)) 8744efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar return; 875c049e4f406a7f7179eba98659044a32508e53289Devang Patel 876c049e4f406a7f7179eba98659044a32508e53289Devang Patel llvm::APInt Range = RHS - LHS; 87716f23570999cac1fa13597386938450843003840Daniel Dunbar // FIXME: parameters such as this should not be hardcoded. 878c049e4f406a7f7179eba98659044a32508e53289Devang Patel if (Range.ult(llvm::APInt(Range.getBitWidth(), 64))) { 879c049e4f406a7f7179eba98659044a32508e53289Devang Patel // Range is small enough to add multiple switch instruction cases. 8804efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar for (unsigned i = 0, e = Range.getZExtValue() + 1; i != e; ++i) { 88197d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(Builder.getInt(LHS), CaseDest); 8822d79d0f3ac0ea77b7bdfc3dd11de8cc3ccd91b8cDevang Patel LHS++; 8832d79d0f3ac0ea77b7bdfc3dd11de8cc3ccd91b8cDevang Patel } 884c049e4f406a7f7179eba98659044a32508e53289Devang Patel return; 8851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 8861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 88716f23570999cac1fa13597386938450843003840Daniel Dunbar // The range is too big. Emit "if" condition into a new block, 88816f23570999cac1fa13597386938450843003840Daniel Dunbar // making sure to save and restore the current insertion point. 88916f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *RestoreBB = Builder.GetInsertBlock(); 89016f23570999cac1fa13597386938450843003840Daniel Dunbar 89116f23570999cac1fa13597386938450843003840Daniel Dunbar // Push this test onto the chain of range checks (which terminates 89216f23570999cac1fa13597386938450843003840Daniel Dunbar // in the default basic block). The switch's default will be changed 89316f23570999cac1fa13597386938450843003840Daniel Dunbar // to the top of this chain after switch emission is complete. 89416f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *FalseDest = CaseRangeBlock; 89555e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar CaseRangeBlock = createBasicBlock("sw.caserange"); 89616f23570999cac1fa13597386938450843003840Daniel Dunbar 89716f23570999cac1fa13597386938450843003840Daniel Dunbar CurFn->getBasicBlockList().push_back(CaseRangeBlock); 89816f23570999cac1fa13597386938450843003840Daniel Dunbar Builder.SetInsertPoint(CaseRangeBlock); 899c049e4f406a7f7179eba98659044a32508e53289Devang Patel 900c049e4f406a7f7179eba98659044a32508e53289Devang Patel // Emit range check. 9011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::Value *Diff = 902578faa837b552403e2002b97fdfbfde14f2448e5Benjamin Kramer Builder.CreateSub(SwitchInsn->getCondition(), Builder.getInt(LHS)); 9031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::Value *Cond = 90497d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner Builder.CreateICmpULE(Diff, Builder.getInt(Range), "inbounds"); 905c049e4f406a7f7179eba98659044a32508e53289Devang Patel Builder.CreateCondBr(Cond, CaseDest, FalseDest); 906c049e4f406a7f7179eba98659044a32508e53289Devang Patel 90716f23570999cac1fa13597386938450843003840Daniel Dunbar // Restore the appropriate insertion point. 908a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar if (RestoreBB) 909a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar Builder.SetInsertPoint(RestoreBB); 910a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar else 911a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar Builder.ClearInsertionPoint(); 912c049e4f406a7f7179eba98659044a32508e53289Devang Patel} 9132d79d0f3ac0ea77b7bdfc3dd11de8cc3ccd91b8cDevang Patel 914c049e4f406a7f7179eba98659044a32508e53289Devang Patelvoid CodeGenFunction::EmitCaseStmt(const CaseStmt &S) { 915d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian // If there is no enclosing switch instance that we're aware of, then this 916d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian // case statement and its block can be elided. This situation only happens 917d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian // when we've constant-folded the switch, are emitting the constant case, 918d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian // and part of the constant case includes another case statement. For 919d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian // instance: switch (4) { case 4: do { case 5: } while (1); } 920303b4f946470a054cea8f91af54008aeb3c09507Fariborz Jahanian if (!SwitchInsn) { 921303b4f946470a054cea8f91af54008aeb3c09507Fariborz Jahanian EmitStmt(S.getSubStmt()); 922d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian return; 923303b4f946470a054cea8f91af54008aeb3c09507Fariborz Jahanian } 924d66715d83e64b6bfd0bddebe51874b1b7a64abefFariborz Jahanian 925b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner // Handle case ranges. 926c049e4f406a7f7179eba98659044a32508e53289Devang Patel if (S.getRHS()) { 927c049e4f406a7f7179eba98659044a32508e53289Devang Patel EmitCaseStmtRange(S); 928c049e4f406a7f7179eba98659044a32508e53289Devang Patel return; 929c049e4f406a7f7179eba98659044a32508e53289Devang Patel } 9301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 93197d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner llvm::ConstantInt *CaseVal = 932a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Builder.getInt(S.getLHS()->EvaluateKnownConstInt(getContext())); 93397d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner 934421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // If the body of the case is just a 'break', and if there was no fallthrough, 935421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // try to not emit an empty block. 93617083601193528a5d3770b688ffdf700f7df3c45Chad Rosier if ((CGM.getCodeGenOpts().OptimizationLevel > 0) && 93717083601193528a5d3770b688ffdf700f7df3c45Chad Rosier isa<BreakStmt>(S.getSubStmt())) { 938b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner JumpDest Block = BreakContinueStack.back().BreakBlock; 9396f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 940b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner // Only do this optimization if there are no cleanups that need emitting. 941b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner if (isObviouslyBranchWithoutCleanups(Block)) { 94297d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(CaseVal, Block.getBlock()); 943421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner 944421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // If there was a fallthrough into this case, make sure to redirect it to 945421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // the end of the switch as well. 946421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner if (Builder.GetInsertBlock()) { 947421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner Builder.CreateBr(Block.getBlock()); 948421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner Builder.ClearInsertionPoint(); 949421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner } 950b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner return; 951b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner } 952b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner } 9536f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 954f84dcda7e2ab2f6d5be5a8c52d22ef4c442dd762Daniel Dunbar EmitBlock(createBasicBlock("sw.bb")); 955c049e4f406a7f7179eba98659044a32508e53289Devang Patel llvm::BasicBlock *CaseDest = Builder.GetInsertBlock(); 95697d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(CaseVal, CaseDest); 9571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9585512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // Recursively emitting the statement is acceptable, but is not wonderful for 9595512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // code where we have many case statements nested together, i.e.: 9605512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // case 1: 9615512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // case 2: 9625512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // case 3: etc. 9635512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // Handling this recursively will create a new block for each case statement 9645512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // that falls through to the next case which is IR intensive. It also causes 9655512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // deep recursion which can run into stack depth limitations. Handle 9665512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // sequential non-range case statements specially. 9675512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner const CaseStmt *CurCase = &S; 9685512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner const CaseStmt *NextCase = dyn_cast<CaseStmt>(S.getSubStmt()); 9695512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner 97097d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner // Otherwise, iteratively add consecutive cases to this switch stmt. 9715512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner while (NextCase && NextCase->getRHS() == 0) { 9725512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner CurCase = NextCase; 97397d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner llvm::ConstantInt *CaseVal = 974a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Builder.getInt(CurCase->getLHS()->EvaluateKnownConstInt(getContext())); 97597d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(CaseVal, CaseDest); 9765512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner NextCase = dyn_cast<CaseStmt>(CurCase->getSubStmt()); 9775512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner } 9781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9795512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // Normal default recursion for non-cases. 9805512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner EmitStmt(CurCase->getSubStmt()); 98151b09f2c528c8460b5465c676173324e44176d62Devang Patel} 98251b09f2c528c8460b5465c676173324e44176d62Devang Patel 98351b09f2c528c8460b5465c676173324e44176d62Devang Patelvoid CodeGenFunction::EmitDefaultStmt(const DefaultStmt &S) { 98416f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *DefaultBlock = SwitchInsn->getDefaultDest(); 9851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(DefaultBlock->empty() && 98655e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar "EmitDefaultStmt: Default block already defined?"); 98716f23570999cac1fa13597386938450843003840Daniel Dunbar EmitBlock(DefaultBlock); 98851b09f2c528c8460b5465c676173324e44176d62Devang Patel EmitStmt(S.getSubStmt()); 98951b09f2c528c8460b5465c676173324e44176d62Devang Patel} 99051b09f2c528c8460b5465c676173324e44176d62Devang Patel 991fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// CollectStatementsForCase - Given the body of a 'switch' statement and a 992fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// constant value that is being switched on, see if we can dead code eliminate 993fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// the body of the switch to a simple series of statements to emit. Basically, 994fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// on a switch (5) we want to find these statements: 995fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// case 5: 996fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// printf(...); <-- 997fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// ++i; <-- 998fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// break; 999fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 1000fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// and add them to the ResultStmts vector. If it is unsafe to do this 1001fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// transformation (for example, one of the elided statements contains a label 1002fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// that might be jumped to), return CSFC_Failure. If we handled it and 'S' 1003fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// should include statements after it (e.g. the printf() line is a substmt of 1004fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// the case) then return CSFC_FallThrough. If we handled it and found a break 1005fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// statement, then return CSFC_Success. 1006fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 1007fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// If Case is non-null, then we are looking for the specified case, checking 1008fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// that nothing we jump over contains labels. If Case is null, then we found 1009fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// the case and are looking for the break. 1010fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 1011fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// If the recursive walk actually finds our Case, then we set FoundCase to 1012fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// true. 1013fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 1014fda0f1f5a278548b012401be07e287c1697fc41cChris Lattnerenum CSFC_Result { CSFC_Failure, CSFC_FallThrough, CSFC_Success }; 1015fda0f1f5a278548b012401be07e287c1697fc41cChris Lattnerstatic CSFC_Result CollectStatementsForCase(const Stmt *S, 1016fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const SwitchCase *Case, 1017fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner bool &FoundCase, 10185f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<const Stmt*> &ResultStmts) { 10193858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If this is a null statement, just succeed. 10203858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (S == 0) 10213858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return Case ? CSFC_Success : CSFC_FallThrough; 10226f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1023fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // If this is the switchcase (case 4: or default) that we're looking for, then 1024fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // we're in business. Just add the substatement. 1025fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (const SwitchCase *SC = dyn_cast<SwitchCase>(S)) { 1026fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (S == Case) { 1027fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner FoundCase = true; 1028fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CollectStatementsForCase(SC->getSubStmt(), 0, FoundCase, 1029fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts); 1030fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 10316f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1032fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Otherwise, this is some other case or default statement, just ignore it. 1033fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CollectStatementsForCase(SC->getSubStmt(), Case, FoundCase, 1034fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts); 1035fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 10363858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 10373858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we are in the live part of the code and we found our break statement, 10383858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // return a success! 10393858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (Case == 0 && isa<BreakStmt>(S)) 10403858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return CSFC_Success; 10416f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 10423858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If this is a switch statement, then it might contain the SwitchCase, the 10433858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // break, or neither. 10443858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (const CompoundStmt *CS = dyn_cast<CompoundStmt>(S)) { 10453858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // Handle this as two cases: we might be looking for the SwitchCase (if so 10463858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // the skipped statements must be skippable) or we might already have it. 10473858938b043bac2f046304ff99a54905acdcc6ddChris Lattner CompoundStmt::const_body_iterator I = CS->body_begin(), E = CS->body_end(); 10483858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (Case) { 10493f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // Keep track of whether we see a skipped declaration. The code could be 10503f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // using the declaration even if it is skipped, so we can't optimize out 10513f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // the decl if the kept statements might refer to it. 10523f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner bool HadSkippedDecl = false; 10536f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 10543858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we're looking for the case, just see if we can skip each of the 10553858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // substatements. 10563858938b043bac2f046304ff99a54905acdcc6ddChris Lattner for (; Case && I != E; ++I) { 10574d509341bd5db06a517daa311379f52bb540bc34Eli Friedman HadSkippedDecl |= isa<DeclStmt>(*I); 10586f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 10593858938b043bac2f046304ff99a54905acdcc6ddChris Lattner switch (CollectStatementsForCase(*I, Case, FoundCase, ResultStmts)) { 10603858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Failure: return CSFC_Failure; 10613858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Success: 10623858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // A successful result means that either 1) that the statement doesn't 10633858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // have the case and is skippable, or 2) does contain the case value 10649467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner // and also contains the break to exit the switch. In the later case, 10659467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner // we just verify the rest of the statements are elidable. 10669467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner if (FoundCase) { 10673f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // If we found the case and skipped declarations, we can't do the 10683f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // optimization. 10693f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner if (HadSkippedDecl) 10703f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner return CSFC_Failure; 10716f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 10729467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner for (++I; I != E; ++I) 10739467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner if (CodeGenFunction::ContainsLabel(*I, true)) 10749467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner return CSFC_Failure; 10759467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner return CSFC_Success; 10769467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner } 10773858938b043bac2f046304ff99a54905acdcc6ddChris Lattner break; 10783858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_FallThrough: 10793858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we have a fallthrough condition, then we must have found the 10803858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // case started to include statements. Consider the rest of the 10813858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // statements in the compound statement as candidates for inclusion. 10823858938b043bac2f046304ff99a54905acdcc6ddChris Lattner assert(FoundCase && "Didn't find case but returned fallthrough?"); 10833858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // We recursively found Case, so we're not looking for it anymore. 10843858938b043bac2f046304ff99a54905acdcc6ddChris Lattner Case = 0; 10856f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 10863f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // If we found the case and skipped declarations, we can't do the 10873f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // optimization. 10883f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner if (HadSkippedDecl) 10893f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner return CSFC_Failure; 10903858938b043bac2f046304ff99a54905acdcc6ddChris Lattner break; 10913858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10923858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10933858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10943858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 10953858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we have statements in our range, then we know that the statements are 10963858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // live and need to be added to the set of statements we're tracking. 10973858938b043bac2f046304ff99a54905acdcc6ddChris Lattner for (; I != E; ++I) { 10983858938b043bac2f046304ff99a54905acdcc6ddChris Lattner switch (CollectStatementsForCase(*I, 0, FoundCase, ResultStmts)) { 10993858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Failure: return CSFC_Failure; 11003858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_FallThrough: 11013858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // A fallthrough result means that the statement was simple and just 11023858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // included in ResultStmt, keep adding them afterwards. 11033858938b043bac2f046304ff99a54905acdcc6ddChris Lattner break; 11043858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Success: 11053858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // A successful result means that we found the break statement and 11063858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // stopped statement inclusion. We just ensure that any leftover stmts 11073858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // are skippable and return success ourselves. 11083858938b043bac2f046304ff99a54905acdcc6ddChris Lattner for (++I; I != E; ++I) 11093858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (CodeGenFunction::ContainsLabel(*I, true)) 11103858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return CSFC_Failure; 11113858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return CSFC_Success; 11126f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier } 11133858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 11146f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 11153858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return Case ? CSFC_Success : CSFC_FallThrough; 11163858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 11173858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 1118fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Okay, this is some other statement that we don't handle explicitly, like a 1119fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // for statement or increment etc. If we are skipping over this statement, 1120fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // just verify it doesn't have labels, which would make it invalid to elide. 1121fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (Case) { 11223f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner if (CodeGenFunction::ContainsLabel(S, true)) 1123fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CSFC_Failure; 1124fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CSFC_Success; 1125fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 11266f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1127fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Otherwise, we want to include this statement. Everything is cool with that 1128fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // so long as it doesn't contain a break out of the switch we're in. 1129fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (CodeGenFunction::containsBreak(S)) return CSFC_Failure; 11306f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1131fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Otherwise, everything is great. Include the statement and tell the caller 1132fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // that we fall through and include the next statement as well. 1133fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts.push_back(S); 1134fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CSFC_FallThrough; 1135fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner} 1136fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1137fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// FindCaseStatementsForValue - Find the case statement being jumped to and 1138fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// then invoke CollectStatementsForCase to find the list of statements to emit 1139fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// for a switch on constant. See the comment above CollectStatementsForCase 1140fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// for more details. 1141fda0f1f5a278548b012401be07e287c1697fc41cChris Lattnerstatic bool FindCaseStatementsForValue(const SwitchStmt &S, 1142e1ecdc168175719d74e112bcacd4aae5e12d4631Richard Trieu const llvm::APSInt &ConstantCondValue, 11435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<const Stmt*> &ResultStmts, 1144fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ASTContext &C) { 1145fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // First step, find the switch case that is being branched to. We can do this 1146fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // efficiently by scanning the SwitchCase list. 1147fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const SwitchCase *Case = S.getSwitchCaseList(); 1148fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const DefaultStmt *DefaultCase = 0; 11496f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1150fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner for (; Case; Case = Case->getNextSwitchCase()) { 1151fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // It's either a default or case. Just remember the default statement in 1152fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // case we're not jumping to any numbered cases. 1153fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (const DefaultStmt *DS = dyn_cast<DefaultStmt>(Case)) { 1154fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner DefaultCase = DS; 1155fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner continue; 1156fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 11576f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1158fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Check to see if this case is the one we're looking for. 1159fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const CaseStmt *CS = cast<CaseStmt>(Case); 1160fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Don't handle case ranges yet. 1161fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (CS->getRHS()) return false; 11626f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1163fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // If we found our case, remember it as 'case'. 1164a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (CS->getLHS()->EvaluateKnownConstInt(C) == ConstantCondValue) 1165fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner break; 1166fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 11676f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1168fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // If we didn't find a matching case, we use a default if it exists, or we 1169fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // elide the whole switch body! 1170fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (Case == 0) { 1171fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // It is safe to elide the body of the switch if it doesn't contain labels 1172fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // etc. If it is safe, return successfully with an empty ResultStmts list. 1173fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (DefaultCase == 0) 1174fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return !CodeGenFunction::ContainsLabel(&S); 1175fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner Case = DefaultCase; 1176fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1177fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1178fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Ok, we know which case is being jumped to, try to collect all the 1179fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // statements that follow it. This can fail for a variety of reasons. Also, 1180fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // check to see that the recursive walk actually found our case statement. 1181fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Insane cases like this can fail to find it in the recursive walk since we 1182fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // don't handle every stmt kind: 1183fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // switch (4) { 1184fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // while (1) { 1185fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // case 4: ... 1186fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner bool FoundCase = false; 1187fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CollectStatementsForCase(S.getBody(), Case, FoundCase, 1188fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts) != CSFC_Failure && 1189fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner FoundCase; 1190fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner} 1191fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 119251b09f2c528c8460b5465c676173324e44176d62Devang Patelvoid CodeGenFunction::EmitSwitchStmt(const SwitchStmt &S) { 1193f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest SwitchExit = getJumpDestInCurrentScope("sw.epilog"); 1194f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 1195f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 1196d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor 1197d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor if (S.getConditionVariable()) 1198b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 1199d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor 1200985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian // Handle nested switch statements. 1201985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian llvm::SwitchInst *SavedSwitchInsn = SwitchInsn; 1202985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian llvm::BasicBlock *SavedCRBlock = CaseRangeBlock; 1203985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian 1204fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // See if we can constant fold the condition of the switch and therefore only 1205fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // emit the live case statement (if any) of the switch. 1206e1ecdc168175719d74e112bcacd4aae5e12d4631Richard Trieu llvm::APSInt ConstantCondValue; 1207fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (ConstantFoldsToSimpleInteger(S.getCond(), ConstantCondValue)) { 12085f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<const Stmt*, 4> CaseStmts; 1209fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (FindCaseStatementsForValue(S, ConstantCondValue, CaseStmts, 1210fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner getContext())) { 1211fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner RunCleanupsScope ExecutedScope(*this); 1212fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1213985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian // At this point, we are no longer "within" a switch instance, so 1214985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian // we can temporarily enforce this to ensure that any embedded case 1215985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian // statements are not emitted. 1216985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian SwitchInsn = 0; 1217985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian 1218fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Okay, we can dead code eliminate everything except this case. Emit the 1219fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // specified series of statements and we're good. 1220fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner for (unsigned i = 0, e = CaseStmts.size(); i != e; ++i) 1221fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner EmitStmt(CaseStmts[i]); 1222985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian 1223fc65ec83f6719f06e460b61f83a3ba1e80c18d04Eric Christopher // Now we want to restore the saved switch instance so that nested 1224fc65ec83f6719f06e460b61f83a3ba1e80c18d04Eric Christopher // switches continue to function properly 1225985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian SwitchInsn = SavedSwitchInsn; 1226985df1c1f2d0666a09bc03f3593929286b0dea65Fariborz Jahanian 1227fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return; 1228fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1229fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 12306f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 123151b09f2c528c8460b5465c676173324e44176d62Devang Patel llvm::Value *CondV = EmitScalarExpr(S.getCond()); 123251b09f2c528c8460b5465c676173324e44176d62Devang Patel 123316f23570999cac1fa13597386938450843003840Daniel Dunbar // Create basic block to hold stuff that comes after switch 123416f23570999cac1fa13597386938450843003840Daniel Dunbar // statement. We also need to create a default block now so that 123516f23570999cac1fa13597386938450843003840Daniel Dunbar // explicit case ranges tests can have a place to jump to on 123616f23570999cac1fa13597386938450843003840Daniel Dunbar // failure. 123755e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar llvm::BasicBlock *DefaultBlock = createBasicBlock("sw.default"); 123816f23570999cac1fa13597386938450843003840Daniel Dunbar SwitchInsn = Builder.CreateSwitch(CondV, DefaultBlock); 123916f23570999cac1fa13597386938450843003840Daniel Dunbar CaseRangeBlock = DefaultBlock; 124051b09f2c528c8460b5465c676173324e44176d62Devang Patel 12410912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // Clear the insertion point to indicate we are in unreachable code. 12420912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar Builder.ClearInsertionPoint(); 1243d28a80d64616b66c91d28bb4c08ca2d8c594de4eEli Friedman 1244e9b8c0a38549692f1b8f688c05c35442fc620865Devang Patel // All break statements jump to NextBlock. If BreakContinueStack is non empty 1245e9b8c0a38549692f1b8f688c05c35442fc620865Devang Patel // then reuse last ContinueBlock. 1246f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest OuterContinue; 1247e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson if (!BreakContinueStack.empty()) 1248f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall OuterContinue = BreakContinueStack.back().ContinueBlock; 1249e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson 1250f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(SwitchExit, OuterContinue)); 125151b09f2c528c8460b5465c676173324e44176d62Devang Patel 125251b09f2c528c8460b5465c676173324e44176d62Devang Patel // Emit switch body. 125351b09f2c528c8460b5465c676173324e44176d62Devang Patel EmitStmt(S.getBody()); 12541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1255e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson BreakContinueStack.pop_back(); 125651b09f2c528c8460b5465c676173324e44176d62Devang Patel 125716f23570999cac1fa13597386938450843003840Daniel Dunbar // Update the default block in case explicit case range tests have 125816f23570999cac1fa13597386938450843003840Daniel Dunbar // been chained on top. 1259ab14ae2ab16088b6a7f69eac6e152c3e9f9ea01bStepan Dyatkovskiy SwitchInsn->setDefaultDest(CaseRangeBlock); 12601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1261f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If a default was never emitted: 126216f23570999cac1fa13597386938450843003840Daniel Dunbar if (!DefaultBlock->getParent()) { 1263f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If we have cleanups, emit the default block so that there's a 1264f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // place to jump through the cleanups from. 1265f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (ConditionScope.requiresCleanups()) { 1266f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(DefaultBlock); 1267f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 1268f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Otherwise, just forward the default block to the switch end. 1269f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } else { 1270ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall DefaultBlock->replaceAllUsesWith(SwitchExit.getBlock()); 1271f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall delete DefaultBlock; 1272f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 127316f23570999cac1fa13597386938450843003840Daniel Dunbar } 127416f23570999cac1fa13597386938450843003840Daniel Dunbar 1275ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall ConditionScope.ForceCleanup(); 1276ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall 127716f23570999cac1fa13597386938450843003840Daniel Dunbar // Emit continuation. 1278ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(SwitchExit.getBlock(), true); 127951b09f2c528c8460b5465c676173324e44176d62Devang Patel 128051b09f2c528c8460b5465c676173324e44176d62Devang Patel SwitchInsn = SavedSwitchInsn; 1281c049e4f406a7f7179eba98659044a32508e53289Devang Patel CaseRangeBlock = SavedCRBlock; 128251b09f2c528c8460b5465c676173324e44176d62Devang Patel} 1283fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 12842819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattnerstatic std::string 1285444be7366d0a1e172c0290a1ea54c1cb16b5947cDaniel DunbarSimplifyConstraint(const char *Constraint, const TargetInfo &Target, 12865f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<TargetInfo::ConstraintInfo> *OutCons=0) { 1287fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::string Result; 12881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1289fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson while (*Constraint) { 1290fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson switch (*Constraint) { 1291fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson default: 1292002333f8b2cf1a8614e532f6ce366b21af85142cStuart Hastings Result += Target.convertConstraint(Constraint); 1293fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson break; 1294fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Ignore these 1295fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case '*': 1296fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case '?': 1297fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case '!': 1298ef44e1110711276ffffe4b22d4ba0cebd49cb330John Thompson case '=': // Will see this and the following in mult-alt constraints. 1299ef44e1110711276ffffe4b22d4ba0cebd49cb330John Thompson case '+': 1300ef44e1110711276ffffe4b22d4ba0cebd49cb330John Thompson break; 1301e6b3dbae38f62164cab3989380cd940242d80120Ulrich Weigand case '#': // Ignore the rest of the constraint alternative. 1302e6b3dbae38f62164cab3989380cd940242d80120Ulrich Weigand while (Constraint[1] && Constraint[1] != ',') 1303e6b3dbae38f62164cab3989380cd940242d80120Ulrich Weigand Constraint++; 1304e6b3dbae38f62164cab3989380cd940242d80120Ulrich Weigand break; 13052f474ea9ef7505df5d092287c48c19974222293bJohn Thompson case ',': 13062f474ea9ef7505df5d092287c48c19974222293bJohn Thompson Result += "|"; 1307fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson break; 1308fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case 'g': 1309fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Result += "imr"; 1310fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson break; 1311300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson case '[': { 13122819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner assert(OutCons && 1313300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson "Must pass output names to constraints with a symbolic name"); 1314300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson unsigned Index; 13151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool result = Target.resolveSymbolicName(Constraint, 13162819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner &(*OutCons)[0], 13172819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner OutCons->size(), Index); 1318cbf40f913aa2aa5de6e0540fed209405d00a2c69Chris Lattner assert(result && "Could not resolve symbolic name"); (void)result; 1319300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson Result += llvm::utostr(Index); 1320300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson break; 1321300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson } 1322fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 13231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1324fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraint++; 1325fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 13261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1327fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson return Result; 1328fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson} 1329fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 133003117d1b2e32d18652401b12d9049871992bf3adRafael Espindola/// AddVariableConstraints - Look at AsmExpr and if it is a variable declared 133103117d1b2e32d18652401b12d9049871992bf3adRafael Espindola/// as using a particular register add that as a constraint that will be used 133203117d1b2e32d18652401b12d9049871992bf3adRafael Espindola/// in this asm stmt. 13330ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindolastatic std::string 133403117d1b2e32d18652401b12d9049871992bf3adRafael EspindolaAddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr, 133503117d1b2e32d18652401b12d9049871992bf3adRafael Espindola const TargetInfo &Target, CodeGenModule &CGM, 1336a23b91d542e336be5051ac54f394e860fb756911Chad Rosier const AsmStmt &Stmt) { 13370ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(&AsmExpr); 13380ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola if (!AsmDeclRef) 13390ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 13400ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola const ValueDecl &Value = *AsmDeclRef->getDecl(); 13410ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola const VarDecl *Variable = dyn_cast<VarDecl>(&Value); 13420ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola if (!Variable) 13430ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 1344a43ef3e0511dc48d98d61598163c9deddc09cb9cEli Friedman if (Variable->getStorageClass() != SC_Register) 1345a43ef3e0511dc48d98d61598163c9deddc09cb9cEli Friedman return Constraint; 13460ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola AsmLabelAttr *Attr = Variable->getAttr<AsmLabelAttr>(); 13470ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola if (!Attr) 13480ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 13495f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Register = Attr->getLabel(); 1350baf86955a9a390f2643a1ea9806832eb4a92f716Rafael Espindola assert(Target.isValidGCCRegisterName(Register)); 1351e3e07a5b3490bc2977859d56bac211afac2236fbEric Christopher // We're using validateOutputConstraint here because we only care if 1352e3e07a5b3490bc2977859d56bac211afac2236fbEric Christopher // this is a register constraint. 1353e3e07a5b3490bc2977859d56bac211afac2236fbEric Christopher TargetInfo::ConstraintInfo Info(Constraint, ""); 1354e3e07a5b3490bc2977859d56bac211afac2236fbEric Christopher if (Target.validateOutputConstraint(Info) && 1355e3e07a5b3490bc2977859d56bac211afac2236fbEric Christopher !Info.allowsRegister()) { 13560ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola CGM.ErrorUnsupported(&Stmt, "__asm__"); 13570ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 13580ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola } 135943fec879a527c74ff01d8aa2bf94a12432249fc7Eric Christopher // Canonicalize the register here before returning it. 136043fec879a527c74ff01d8aa2bf94a12432249fc7Eric Christopher Register = Target.getNormalizedGCCRegisterName(Register); 13610ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return "{" + Register.str() + "}"; 13620ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola} 13630ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola 13646d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedmanllvm::Value* 136542b60551eff3a424e191b293bfd606559dc96bffChad RosierCodeGenFunction::EmitAsmInputLValue(const TargetInfo::ConstraintInfo &Info, 13666d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman LValue InputValue, QualType InputType, 13676d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman std::string &ConstraintStr) { 1368634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson llvm::Value *Arg; 13691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (Info.allowsRegister() || !Info.allowsMemory()) { 13709d232c884ea9872d6555df0fd7359699819bc1f1John McCall if (CodeGenFunction::hasScalarEvaluationKind(InputType)) { 1371545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall Arg = EmitLoadOfLValue(InputValue).getScalarVal(); 1372634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } else { 13732acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *Ty = ConvertType(InputType); 137425a6a84cf5067b32c271e3ba078676dee838798dMicah Villmow uint64_t Size = CGM.getDataLayout().getTypeSizeInBits(Ty); 1375ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson if (Size <= 64 && llvm::isPowerOf2_64(Size)) { 1376d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Ty = llvm::IntegerType::get(getLLVMContext(), Size); 1377ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson Ty = llvm::PointerType::getUnqual(Ty); 13781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13796d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = Builder.CreateLoad(Builder.CreateBitCast(InputValue.getAddress(), 13806d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Ty)); 1381ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson } else { 13826d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = InputValue.getAddress(); 1383ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson ConstraintStr += '*'; 1384ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson } 1385634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } 1386634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } else { 13876d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = InputValue.getAddress(); 1388634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson ConstraintStr += '*'; 1389634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } 13901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1391634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson return Arg; 1392634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson} 1393634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson 139442b60551eff3a424e191b293bfd606559dc96bffChad Rosierllvm::Value* CodeGenFunction::EmitAsmInput( 13956d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman const TargetInfo::ConstraintInfo &Info, 13966d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman const Expr *InputExpr, 13976d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman std::string &ConstraintStr) { 13986d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman if (Info.allowsRegister() || !Info.allowsMemory()) 13999d232c884ea9872d6555df0fd7359699819bc1f1John McCall if (CodeGenFunction::hasScalarEvaluationKind(InputExpr->getType())) 14006d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman return EmitScalarExpr(InputExpr); 14016d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman 14026d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman InputExpr = InputExpr->IgnoreParenNoopCasts(getContext()); 14036d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman LValue Dest = EmitLValue(InputExpr); 140442b60551eff3a424e191b293bfd606559dc96bffChad Rosier return EmitAsmInputLValue(Info, Dest, InputExpr->getType(), ConstraintStr); 14056d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman} 14066d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman 140747fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner/// getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline 14085d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner/// asm call instruction. The !srcloc MDNode contains a list of constant 14095d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner/// integers which are the source locations of the start of each line in the 14105d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner/// asm. 141147fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattnerstatic llvm::MDNode *getAsmSrcLocInfo(const StringLiteral *Str, 141247fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner CodeGenFunction &CGF) { 14135f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<llvm::Value *, 8> Locs; 14145d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner // Add the location of the first line to the MDNode. 14155d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner Locs.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 14165d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner Str->getLocStart().getRawEncoding())); 14175f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef StrVal = Str->getString(); 14185d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner if (!StrVal.empty()) { 14195d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner const SourceManager &SM = CGF.CGM.getContext().getSourceManager(); 14204e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &LangOpts = CGF.CGM.getLangOpts(); 14216f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 14225d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner // Add the location of the start of each subsequent line of the asm to the 14235d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner // MDNode. 14245d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner for (unsigned i = 0, e = StrVal.size()-1; i != e; ++i) { 14255d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner if (StrVal[i] != '\n') continue; 14265d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner SourceLocation LineLoc = Str->getLocationOfByte(i+1, SM, LangOpts, 14275d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner CGF.Target); 14285d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner Locs.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 14295d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner LineLoc.getRawEncoding())); 14305d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner } 14316f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier } 14326f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 14336f141659cab11109d9931d92d0988f8850778de3Jay Foad return llvm::MDNode::get(CGF.getLLVMContext(), Locs); 143447fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner} 143547fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner 1436a23b91d542e336be5051ac54f394e860fb756911Chad Rosiervoid CodeGenFunction::EmitAsmStmt(const AsmStmt &S) { 1437be3ace834ee7438915e73d2115365d57d03ceb99Chad Rosier // Assemble the final asm string. 1438da083b2ce8db27ce6e508cb77cb12c0fc8b7cad9Chad Rosier std::string AsmString = S.generateAsmString(getContext()); 14391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1440481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner // Get all the output and input constraints together. 14415f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 14425f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1443481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner 14441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0, e = S.getNumOutputs(); i != e; i++) { 1445481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo Info(S.getOutputConstraint(i), 1446481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner S.getOutputName(i)); 1447b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner bool IsValid = Target.validateOutputConstraint(Info); (void)IsValid; 1448b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner assert(IsValid && "Failed to parse output constraint"); 1449481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner OutputConstraintInfos.push_back(Info); 14501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 14511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1452481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner for (unsigned i = 0, e = S.getNumInputs(); i != e; i++) { 1453481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo Info(S.getInputConstraint(i), 1454481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner S.getInputName(i)); 1455b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner bool IsValid = Target.validateInputConstraint(OutputConstraintInfos.data(), 1456b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner S.getNumOutputs(), Info); 1457b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner assert(IsValid && "Failed to parse input constraint"); (void)IsValid; 1458481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner InputConstraintInfos.push_back(Info); 1459481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner } 14601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1461fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::string Constraints; 14621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1463ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner std::vector<LValue> ResultRegDests; 1464ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner std::vector<QualType> ResultRegQualTys; 1465ef6de3da8572607f786303c07150daa6e140ab19Jay Foad std::vector<llvm::Type *> ResultRegTypes; 1466ef6de3da8572607f786303c07150daa6e140ab19Jay Foad std::vector<llvm::Type *> ResultTruncRegTypes; 1467d1c0c940ebc8e55d5c4672f61abedf87d6ea36f4Chad Rosier std::vector<llvm::Type *> ArgTypes; 1468fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::vector<llvm::Value*> Args; 1469f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson 1470f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson // Keep track of inout constraints. 1471f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson std::string InOutConstraints; 1472f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson std::vector<llvm::Value*> InOutArgs; 14739cbe4f0ba01ec304e1e3d071c071f7bca33631c0Chris Lattner std::vector<llvm::Type*> InOutArgTypes; 147403eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 14751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0, e = S.getNumOutputs(); i != e; i++) { 1476481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i]; 147703eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 1478fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Simplify the output constraint. 1479481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner std::string OutputConstraint(S.getOutputConstraint(i)); 1480a5694b8b0096215137bf1c273764ec93ac4898fdLauro Ramos Venancio OutputConstraint = SimplifyConstraint(OutputConstraint.c_str() + 1, Target); 14811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1482810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *OutExpr = S.getOutputExpr(i); 1483810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner OutExpr = OutExpr->IgnoreParenNoopCasts(getContext()); 14841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1485a18f539628a6506bae6af52eacd541cebefff762Eric Christopher OutputConstraint = AddVariableConstraints(OutputConstraint, *OutExpr, 1486a18f539628a6506bae6af52eacd541cebefff762Eric Christopher Target, CGM, S); 14870ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola 1488810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner LValue Dest = EmitLValue(OutExpr); 1489ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner if (!Constraints.empty()) 1490bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson Constraints += ','; 1491bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson 1492a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // If this is a register output, then make the inline asm return it 1493a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // by-value. If this is a memory result, return the value by-reference. 14949d232c884ea9872d6555df0fd7359699819bc1f1John McCall if (!Info.allowsMemory() && hasScalarEvaluationKind(OutExpr->getType())) { 1495a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner Constraints += "=" + OutputConstraint; 1496ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner ResultRegQualTys.push_back(OutExpr->getType()); 1497ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner ResultRegDests.push_back(Dest); 1498a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultRegTypes.push_back(ConvertTypeForMem(OutExpr->getType())); 1499a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultTruncRegTypes.push_back(ResultRegTypes.back()); 15001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1501a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // If this output is tied to an input, and if the input is larger, then 1502a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // we need to set the actual result type of the inline asm node to be the 1503a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // same as the input type. 1504a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (Info.hasMatchingInput()) { 1505ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner unsigned InputNo; 1506ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner for (InputNo = 0; InputNo != S.getNumInputs(); ++InputNo) { 1507ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner TargetInfo::ConstraintInfo &Input = InputConstraintInfos[InputNo]; 1508aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Input.hasTiedOperand() && Input.getTiedOperand() == i) 1509a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner break; 1510ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner } 1511ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner assert(InputNo != S.getNumInputs() && "Didn't find matching input!"); 15121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1513a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner QualType InputTy = S.getInputExpr(InputNo)->getType(); 1514aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner QualType OutputType = OutExpr->getType(); 15151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1516a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner uint64_t InputSize = getContext().getTypeSize(InputTy); 1517aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (getContext().getTypeSize(OutputType) < InputSize) { 1518aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Form the asm to return the value as a larger integer or fp type. 1519aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner ResultRegTypes.back() = ConvertType(InputTy); 1520a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1521a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1522ef6de3da8572607f786303c07150daa6e140ab19Jay Foad if (llvm::Type* AdjTy = 15234b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne getTargetHooks().adjustInlineAsmType(*this, OutputConstraint, 15244b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne ResultRegTypes.back())) 1525f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen ResultRegTypes.back() = AdjTy; 1526fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } else { 1527fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson ArgTypes.push_back(Dest.getAddress()->getType()); 1528cad3ab611ebd3bee3ce6395d649640047f904cdeAnders Carlsson Args.push_back(Dest.getAddress()); 1529f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson Constraints += "=*"; 1530fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += OutputConstraint; 1531f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson } 15321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 153344def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.isReadWrite()) { 1534f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson InOutConstraints += ','; 1535634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson 1536fca9361839ecc53224c764517e62fc0e15166004Anders Carlsson const Expr *InputExpr = S.getOutputExpr(i); 153742b60551eff3a424e191b293bfd606559dc96bffChad Rosier llvm::Value *Arg = EmitAsmInputLValue(Info, Dest, InputExpr->getType(), 15386d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman InOutConstraints); 15391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1540acb5310542b82e7acf5f5a91fa619e4b7efeff5cBill Wendling if (llvm::Type* AdjTy = 1541acb5310542b82e7acf5f5a91fa619e4b7efeff5cBill Wendling getTargetHooks().adjustInlineAsmType(*this, OutputConstraint, 1542acb5310542b82e7acf5f5a91fa619e4b7efeff5cBill Wendling Arg->getType())) 1543acb5310542b82e7acf5f5a91fa619e4b7efeff5cBill Wendling Arg = Builder.CreateBitCast(Arg, AdjTy); 1544acb5310542b82e7acf5f5a91fa619e4b7efeff5cBill Wendling 154544def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) 15469f2505b934745b18d580ade4dac7b8b16952a30cAnders Carlsson InOutConstraints += llvm::utostr(i); 15479f2505b934745b18d580ade4dac7b8b16952a30cAnders Carlsson else 15489f2505b934745b18d580ade4dac7b8b16952a30cAnders Carlsson InOutConstraints += OutputConstraint; 15492763b3af0a527c3a63cb058b90c22db0b7bcf558Anders Carlsson 1550fca9361839ecc53224c764517e62fc0e15166004Anders Carlsson InOutArgTypes.push_back(Arg->getType()); 1551fca9361839ecc53224c764517e62fc0e15166004Anders Carlsson InOutArgs.push_back(Arg); 1552f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson } 1553fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 15541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1555fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson unsigned NumConstraints = S.getNumOutputs() + S.getNumInputs(); 15561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1557fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson for (unsigned i = 0, e = S.getNumInputs(); i != e; i++) { 1558fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson const Expr *InputExpr = S.getInputExpr(i); 1559fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 1560481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 1561481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner 1562ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner if (!Constraints.empty()) 1563fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += ','; 15641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1565fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Simplify the input constraint. 1566481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner std::string InputConstraint(S.getInputConstraint(i)); 1567300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson InputConstraint = SimplifyConstraint(InputConstraint.c_str(), Target, 15682819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner &OutputConstraintInfos); 1569fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 15700ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola InputConstraint = 157103117d1b2e32d18652401b12d9049871992bf3adRafael Espindola AddVariableConstraints(InputConstraint, 15720ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola *InputExpr->IgnoreParenNoopCasts(getContext()), 15730ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola Target, CGM, S); 15740ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola 157542b60551eff3a424e191b293bfd606559dc96bffChad Rosier llvm::Value *Arg = EmitAsmInput(Info, InputExpr, Constraints); 15761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15774df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // If this input argument is tied to a larger output result, extend the 15784df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // input to be the same size as the output. The LLVM backend wants to see 15794df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // the input and output of a matching constraint be the same size. Note 15804df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // that GCC does not define what the top bits are here. We use zext because 15814df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // that is usually cheaper, but LLVM IR should really get an anyext someday. 15824df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner if (Info.hasTiedOperand()) { 15834df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner unsigned Output = Info.getTiedOperand(); 1584aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner QualType OutputType = S.getOutputExpr(Output)->getType(); 15854df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner QualType InputTy = InputExpr->getType(); 15861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1587aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (getContext().getTypeSize(OutputType) > 15884df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner getContext().getTypeSize(InputTy)) { 15894df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // Use ptrtoint as appropriate so that we can do our extension. 15904df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner if (isa<llvm::PointerType>(Arg->getType())) 159177b89b87c3b9220fea1bc80f6d6598d2003cc8a8Chris Lattner Arg = Builder.CreatePtrToInt(Arg, IntPtrTy); 15922acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *OutputTy = ConvertType(OutputType); 1593aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (isa<llvm::IntegerType>(OutputTy)) 1594aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner Arg = Builder.CreateZExt(Arg, OutputTy); 159593f1322684e928a559286ba1c7cb83af077aa658Peter Collingbourne else if (isa<llvm::PointerType>(OutputTy)) 159693f1322684e928a559286ba1c7cb83af077aa658Peter Collingbourne Arg = Builder.CreateZExt(Arg, IntPtrTy); 159793f1322684e928a559286ba1c7cb83af077aa658Peter Collingbourne else { 159893f1322684e928a559286ba1c7cb83af077aa658Peter Collingbourne assert(OutputTy->isFloatingPointTy() && "Unexpected output type"); 1599aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner Arg = Builder.CreateFPExt(Arg, OutputTy); 160093f1322684e928a559286ba1c7cb83af077aa658Peter Collingbourne } 16014df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner } 16024df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner } 1603acb5310542b82e7acf5f5a91fa619e4b7efeff5cBill Wendling if (llvm::Type* AdjTy = 16044b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne getTargetHooks().adjustInlineAsmType(*this, InputConstraint, 16054b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne Arg->getType())) 1606f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen Arg = Builder.CreateBitCast(Arg, AdjTy); 16071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1608fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson ArgTypes.push_back(Arg->getType()); 1609fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Args.push_back(Arg); 1610fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += InputConstraint; 1611fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 16121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1613f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson // Append the "input" part of inout constraints last. 1614f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson for (unsigned i = 0, e = InOutArgs.size(); i != e; i++) { 1615f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson ArgTypes.push_back(InOutArgTypes[i]); 1616f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson Args.push_back(InOutArgs[i]); 1617f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson } 1618f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson Constraints += InOutConstraints; 16191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1620fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Clobbers 1621fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson for (unsigned i = 0, e = S.getNumClobbers(); i != e; i++) { 162233f0558f75f70061707d1388e305b8f92f4e55deChad Rosier StringRef Clobber = S.getClobber(i); 1623fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 1624de31fd7eeebdc64fb043463e7f515dab8eccac8dEric Christopher if (Clobber != "memory" && Clobber != "cc") 162583c021c6d33aa173cf1a6e3bc61006dabb042703Anders Carlsson Clobber = Target.getNormalizedGCCRegisterName(Clobber); 16261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1627ea041758d49215167e473a515b8d46e77b170ccfAnders Carlsson if (i != 0 || NumConstraints != 0) 1628fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += ','; 16291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1630ea041758d49215167e473a515b8d46e77b170ccfAnders Carlsson Constraints += "~{"; 1631fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += Clobber; 1632ea041758d49215167e473a515b8d46e77b170ccfAnders Carlsson Constraints += '}'; 1633fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 16341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1635fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Add machine specific clobbers 1636ccf614c479ac93326a01e7b373b30759eed7807fEli Friedman std::string MachineClobbers = Target.getClobbers(); 1637ccf614c479ac93326a01e7b373b30759eed7807fEli Friedman if (!MachineClobbers.empty()) { 1638fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson if (!Constraints.empty()) 1639fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += ','; 1640ccf614c479ac93326a01e7b373b30759eed7807fEli Friedman Constraints += MachineClobbers; 1641fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 1642bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson 16432acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *ResultType; 1644a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (ResultRegTypes.empty()) 16458b418685e9e4f02f4eb2a76e1ec063e07552b68dChris Lattner ResultType = VoidTy; 1646a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner else if (ResultRegTypes.size() == 1) 1647a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultType = ResultRegTypes[0]; 1648bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson else 1649d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall ResultType = llvm::StructType::get(getLLVMContext(), ResultRegTypes); 16501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16512acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::FunctionType *FTy = 1652fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson llvm::FunctionType::get(ResultType, ArgTypes, false); 16531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16542ab7d43e450333d52fdf087bf2558a74dbe3c9fdChad Rosier bool HasSideEffect = S.isVolatile() || S.getNumOutputs() == 0; 1655fcf75a3d8c072eabbf25c9b33ccbb1b8bd042cfcChad Rosier llvm::InlineAsm::AsmDialect AsmDialect = isa<MSAsmStmt>(&S) ? 1656fcf75a3d8c072eabbf25c9b33ccbb1b8bd042cfcChad Rosier llvm::InlineAsm::AD_Intel : llvm::InlineAsm::AD_ATT; 16571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::InlineAsm *IA = 1658790cbd84d07f0dc9253ade9f67e6ed8c43f08a59Chad Rosier llvm::InlineAsm::get(FTy, AsmString, Constraints, HasSideEffect, 1659fcf75a3d8c072eabbf25c9b33ccbb1b8bd042cfcChad Rosier /* IsAlignStack */ false, AsmDialect); 16604c7d9f1507d0f102bd4133bba63348636facd469Jay Foad llvm::CallInst *Result = Builder.CreateCall(IA, Args); 1661785b778203a474c6e4b9e17ae91cd2a358868877Bill Wendling Result->addAttribute(llvm::AttributeSet::FunctionIndex, 166215e05e932ccf9ba2621394834b62684b42d6fd40Peter Collingbourne llvm::Attribute::NoUnwind); 16631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1664fc1a9c312d249a2c7458f763f848ba42685c23f8Chris Lattner // Slap the source location of the inline asm into a !srcloc metadata on the 1665a23b91d542e336be5051ac54f394e860fb756911Chad Rosier // call. FIXME: Handle metadata for MS-style inline asms. 1666a23b91d542e336be5051ac54f394e860fb756911Chad Rosier if (const GCCAsmStmt *gccAsmStmt = dyn_cast<GCCAsmStmt>(&S)) 1667a23b91d542e336be5051ac54f394e860fb756911Chad Rosier Result->setMetadata("srcloc", getAsmSrcLocInfo(gccAsmStmt->getAsmString(), 1668a23b91d542e336be5051ac54f394e860fb756911Chad Rosier *this)); 16691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1670a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // Extract all of the register value results from the asm. 1671a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner std::vector<llvm::Value*> RegResults; 1672a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (ResultRegTypes.size() == 1) { 1673a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner RegResults.push_back(Result); 1674bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson } else { 1675a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner for (unsigned i = 0, e = ResultRegTypes.size(); i != e; ++i) { 1676bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson llvm::Value *Tmp = Builder.CreateExtractValue(Result, i, "asmresult"); 1677a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner RegResults.push_back(Tmp); 1678a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1679a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 16801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1681a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner for (unsigned i = 0, e = RegResults.size(); i != e; ++i) { 1682a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner llvm::Value *Tmp = RegResults[i]; 16831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1684a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // If the result type of the LLVM IR asm doesn't match the result type of 1685a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // the expression, do the conversion. 1686a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (ResultRegTypes[i] != ResultTruncRegTypes[i]) { 16872acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *TruncTy = ResultTruncRegTypes[i]; 16886f61ba2e57aac6fc76638addce18ed59137ab9c1Chad Rosier 1689aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Truncate the integer result to the right size, note that TruncTy can be 1690aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // a pointer. 1691aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (TruncTy->isFloatingPointTy()) 1692aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner Tmp = Builder.CreateFPTrunc(Tmp, TruncTy); 16932dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman else if (TruncTy->isPointerTy() && Tmp->getType()->isIntegerTy()) { 169425a6a84cf5067b32c271e3ba078676dee838798dMicah Villmow uint64_t ResSize = CGM.getDataLayout().getTypeSizeInBits(TruncTy); 1695d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Tmp = Builder.CreateTrunc(Tmp, 1696d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::IntegerType::get(getLLVMContext(), (unsigned)ResSize)); 1697a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner Tmp = Builder.CreateIntToPtr(Tmp, TruncTy); 16982dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman } else if (Tmp->getType()->isPointerTy() && TruncTy->isIntegerTy()) { 169925a6a84cf5067b32c271e3ba078676dee838798dMicah Villmow uint64_t TmpSize =CGM.getDataLayout().getTypeSizeInBits(Tmp->getType()); 1700d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Tmp = Builder.CreatePtrToInt(Tmp, 1701d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::IntegerType::get(getLLVMContext(), (unsigned)TmpSize)); 17022dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman Tmp = Builder.CreateTrunc(Tmp, TruncTy); 17032dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman } else if (TruncTy->isIntegerTy()) { 17042dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman Tmp = Builder.CreateTrunc(Tmp, TruncTy); 1705f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen } else if (TruncTy->isVectorTy()) { 1706f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen Tmp = Builder.CreateBitCast(Tmp, TruncTy); 1707a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1708bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson } 17091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1710545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall EmitStoreThroughLValue(RValue::get(Tmp), ResultRegDests[i]); 1711bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson } 1712fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson} 1713