CGStmt.cpp revision 28bbe4b8acc338476fe0825769b41fb32b423c72
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 14e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta#include "CGDebugInfo.h" 15e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta#include "CodeGenModule.h" 165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "CodeGenFunction.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" 2217d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson#include "llvm/InlineAsm.h" 2317d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson#include "llvm/Intrinsics.h" 24ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson#include "llvm/Target/TargetData.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()) { 3460e4fd95ed8c1f99697f4d9f73d07717b6e21048Devang Patel if (isa<DeclStmt>(S)) 3560e4fd95ed8c1f99697f4d9f73d07717b6e21048Devang Patel DI->setLocation(S->getLocEnd()); 3660e4fd95ed8c1f99697f4d9f73d07717b6e21048Devang Patel else 3760e4fd95ed8c1f99697f4d9f73d07717b6e21048Devang Patel DI->setLocation(S->getLocStart()); 385a6fbcfd8c15a2296f94a0473a68ec09d429827fDevang Patel DI->UpdateLineDirectiveRegion(Builder); 394d939e64142126b872e39c11dc995aa993f137feDevang Patel DI->EmitStopPoint(Builder); 400912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar } 410912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar} 420912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitStmt(const Stmt *S) { 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(S && "Null statement?"); 45a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar 460912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // Check if we can handle this without bothering to generate an 470912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // insert point or debug info. 480912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (EmitSimpleStmt(S)) 490912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar return; 500912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 51d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // Check if we are generating unreachable code. 52d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar if (!HaveInsertPoint()) { 53d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // If so, and the statement doesn't contain a label, then we do not need to 54d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // generate actual code. This is safe because (1) the current point is 55d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // unreachable, so we don't need to execute the code, and (2) we've already 56d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // handled the statements which update internal data structures (like the 57d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // local variable map) which could be used by subsequent statements. 58d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar if (!ContainsLabel(S)) { 59d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // Verify that any decl statements were handled as simple, they may be in 60d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // scope of subsequent reachable statements. 61d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar assert(!isa<DeclStmt>(*S) && "Unexpected DeclStmt!"); 62d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar return; 63d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar } 64d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar 65d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar // Otherwise, make a new block to hold the code. 66d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar EnsureInsertPoint(); 67d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar } 68d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar 690912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // Generate a stoppoint if we are emitting debug info. 700912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(S); 71e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (S->getStmtClass()) { 732a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::NoStmtClass: 742a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::CXXCatchStmtClass: 7528bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley case Stmt::SEHExceptStmtClass: 7628bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley case Stmt::SEHFinallyStmtClass: 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: 822a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::GotoStmtClass: 832a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::BreakStmtClass: 842a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::ContinueStmtClass: 852a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::DefaultStmtClass: 862a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::CaseStmtClass: 872a41637a995affa1563f4d82a8b026e326a2faa0John McCall llvm_unreachable("should have emitted these statements as simple"); 88cd5e60e1d4093b9a757cc85e35fccc093f8f8527Daniel Dunbar 892a41637a995affa1563f4d82a8b026e326a2faa0John McCall#define STMT(Type, Base) 902a41637a995affa1563f4d82a8b026e326a2faa0John McCall#define ABSTRACT_STMT(Op) 912a41637a995affa1563f4d82a8b026e326a2faa0John McCall#define EXPR(Type, Base) \ 922a41637a995affa1563f4d82a8b026e326a2faa0John McCall case Stmt::Type##Class: 932a41637a995affa1563f4d82a8b026e326a2faa0John McCall#include "clang/AST/StmtNodes.inc" 94cd5b22e12b6513163dd131589746c194090f14e6John McCall { 95cd5b22e12b6513163dd131589746c194090f14e6John McCall // Remember the block we came in on. 96cd5b22e12b6513163dd131589746c194090f14e6John McCall llvm::BasicBlock *incoming = Builder.GetInsertBlock(); 97cd5b22e12b6513163dd131589746c194090f14e6John McCall assert(incoming && "expression emission must have an insertion point"); 98cd5b22e12b6513163dd131589746c194090f14e6John McCall 992a41637a995affa1563f4d82a8b026e326a2faa0John McCall EmitIgnoredExpr(cast<Expr>(S)); 1001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 101cd5b22e12b6513163dd131589746c194090f14e6John McCall llvm::BasicBlock *outgoing = Builder.GetInsertBlock(); 102cd5b22e12b6513163dd131589746c194090f14e6John McCall assert(outgoing && "expression emission cleared block!"); 103cd5b22e12b6513163dd131589746c194090f14e6John McCall 104cd5b22e12b6513163dd131589746c194090f14e6John McCall // The expression emitters assume (reasonably!) that the insertion 105cd5b22e12b6513163dd131589746c194090f14e6John McCall // point is always set. To maintain that, the call-emission code 106cd5b22e12b6513163dd131589746c194090f14e6John McCall // for noreturn functions has to enter a new block with no 107cd5b22e12b6513163dd131589746c194090f14e6John McCall // predecessors. We want to kill that block and mark the current 108cd5b22e12b6513163dd131589746c194090f14e6John McCall // insertion point unreachable in the common case of a call like 109cd5b22e12b6513163dd131589746c194090f14e6John McCall // "exit();". Since expression emission doesn't otherwise create 110cd5b22e12b6513163dd131589746c194090f14e6John McCall // blocks with no predecessors, we can just test for that. 111cd5b22e12b6513163dd131589746c194090f14e6John McCall // However, we must be careful not to do this to our incoming 112cd5b22e12b6513163dd131589746c194090f14e6John McCall // block, because *statement* emission does sometimes create 113cd5b22e12b6513163dd131589746c194090f14e6John McCall // reachable blocks which will have no predecessors until later in 114cd5b22e12b6513163dd131589746c194090f14e6John McCall // the function. This occurs with, e.g., labels that are not 115cd5b22e12b6513163dd131589746c194090f14e6John McCall // reachable by fallthrough. 116cd5b22e12b6513163dd131589746c194090f14e6John McCall if (incoming != outgoing && outgoing->use_empty()) { 117cd5b22e12b6513163dd131589746c194090f14e6John McCall outgoing->eraseFromParent(); 118cd5b22e12b6513163dd131589746c194090f14e6John McCall Builder.ClearInsertionPoint(); 1195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 121cd5b22e12b6513163dd131589746c194090f14e6John McCall } 1222a41637a995affa1563f4d82a8b026e326a2faa0John McCall 1231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Stmt::IndirectGotoStmtClass: 1240ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar EmitIndirectGotoStmt(cast<IndirectGotoStmt>(*S)); break; 1255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::IfStmtClass: EmitIfStmt(cast<IfStmt>(*S)); break; 1275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::WhileStmtClass: EmitWhileStmt(cast<WhileStmt>(*S)); break; 1285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::DoStmtClass: EmitDoStmt(cast<DoStmt>(*S)); break; 1295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::ForStmtClass: EmitForStmt(cast<ForStmt>(*S)); break; 1301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case Stmt::ReturnStmtClass: EmitReturnStmt(cast<ReturnStmt>(*S)); break; 132a4275d194b656867bdcdb725b2a7ba3251a1a638Daniel Dunbar 13351b09f2c528c8460b5465c676173324e44176d62Devang Patel case Stmt::SwitchStmtClass: EmitSwitchStmt(cast<SwitchStmt>(*S)); break; 134fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case Stmt::AsmStmtClass: EmitAsmStmt(cast<AsmStmt>(*S)); break; 1350a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar 1360a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtTryStmtClass: 13764d5d6c5903157c521af496479d06dc26032d718Anders Carlsson EmitObjCAtTryStmt(cast<ObjCAtTryStmt>(*S)); 1381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump break; 1390a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtCatchStmtClass: 140dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlsson assert(0 && "@catch statements should be handled by EmitObjCAtTryStmt"); 141dde0a94120915fa925d1ffcdb997c7b44dc9fa21Anders Carlsson break; 1420a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtFinallyStmtClass: 14364d5d6c5903157c521af496479d06dc26032d718Anders Carlsson assert(0 && "@finally statements should be handled by EmitObjCAtTryStmt"); 1440a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 1450a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtThrowStmtClass: 14664d5d6c5903157c521af496479d06dc26032d718Anders Carlsson EmitObjCAtThrowStmt(cast<ObjCAtThrowStmt>(*S)); 1470a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 1480a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar case Stmt::ObjCAtSynchronizedStmtClass: 14910cac6f7115b59a466bb8d2d51cdddeb38aadc37Chris Lattner EmitObjCAtSynchronizedStmt(cast<ObjCAtSynchronizedStmt>(*S)); 1500a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 1511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Stmt::ObjCForCollectionStmtClass: 1523d8400d9a61aa4b63ff35e5cede405b32a41425eAnders Carlsson EmitObjCForCollectionStmt(cast<ObjCForCollectionStmt>(*S)); 1530a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar break; 1546815e941998659a55c20c147861b0f437928c3d8Anders Carlsson 1556815e941998659a55c20c147861b0f437928c3d8Anders Carlsson case Stmt::CXXTryStmtClass: 1566815e941998659a55c20c147861b0f437928c3d8Anders Carlsson EmitCXXTryStmt(cast<CXXTryStmt>(*S)); 1576815e941998659a55c20c147861b0f437928c3d8Anders Carlsson break; 158ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith case Stmt::CXXForRangeStmtClass: 159ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitCXXForRangeStmt(cast<CXXForRangeStmt>(*S)); 16028bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley case Stmt::SEHTryStmtClass: 16128bbe4b8acc338476fe0825769b41fb32b423c72John Wiegley // FIXME Not yet implemented 162ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith break; 1635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1660912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarbool CodeGenFunction::EmitSimpleStmt(const Stmt *S) { 1670912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar switch (S->getStmtClass()) { 1680912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar default: return false; 1690912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::NullStmtClass: break; 1700912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::CompoundStmtClass: EmitCompoundStmt(cast<CompoundStmt>(*S)); break; 171d286f05f1234bac289173f0eed88d7ecbaea0099Daniel Dunbar case Stmt::DeclStmtClass: EmitDeclStmt(cast<DeclStmt>(*S)); break; 1720912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::LabelStmtClass: EmitLabelStmt(cast<LabelStmt>(*S)); break; 1730912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::GotoStmtClass: EmitGotoStmt(cast<GotoStmt>(*S)); break; 1740912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::BreakStmtClass: EmitBreakStmt(cast<BreakStmt>(*S)); break; 1750912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::ContinueStmtClass: EmitContinueStmt(cast<ContinueStmt>(*S)); break; 1760912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::DefaultStmtClass: EmitDefaultStmt(cast<DefaultStmt>(*S)); break; 1770912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar case Stmt::CaseStmtClass: EmitCaseStmt(cast<CaseStmt>(*S)); break; 1780912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar } 1790912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 1800912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar return true; 1810912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar} 1820912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar 1833379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner/// EmitCompoundStmt - Emit a compound statement {..} node. If GetLast is true, 1843379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner/// this captures the expression result of the last sub-statement and returns it 1853379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner/// (for use by the statement expression extension). 1869b65551d0b387a7597fb39356a4d8ef10046445eChris LattnerRValue CodeGenFunction::EmitCompoundStmt(const CompoundStmt &S, bool GetLast, 187558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot AggSlot) { 1887d22bf00dbabca86ba791f56a99e006181fa22ddChris Lattner PrettyStackTraceLoc CrashInfo(getContext().getSourceManager(),S.getLBracLoc(), 1897d22bf00dbabca86ba791f56a99e006181fa22ddChris Lattner "LLVM IR generation of compound statement ('{}')"); 1901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 191e896d98548b02223c7740d807a0aa6e20fba7079Anders Carlsson CGDebugInfo *DI = getDebugInfo(); 1921c6a38bcea17801e9a4738753aee845381af2b6cSanjiv Gupta if (DI) { 193bbd9fa4b4a0fea47f94ac3eb4eaf5cc8079defe1Devang Patel DI->setLocation(S.getLBracLoc()); 1944d939e64142126b872e39c11dc995aa993f137feDevang Patel DI->EmitRegionStart(Builder); 1951c6a38bcea17801e9a4738753aee845381af2b6cSanjiv Gupta } 1961c6a38bcea17801e9a4738753aee845381af2b6cSanjiv Gupta 197c71c845fe77ee1f891d60232ec320912d88557eeAnders Carlsson // Keep track of the current cleanup stack depth. 198f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope Scope(*this); 1991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2003379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner for (CompoundStmt::const_body_iterator I = S.body_begin(), 2013379320c10001d7e1ee5d7e7142c417f797cfe82Chris Lattner E = S.body_end()-GetLast; I != E; ++I) 2025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitStmt(*I); 203e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta 2041c6a38bcea17801e9a4738753aee845381af2b6cSanjiv Gupta if (DI) { 205cd9199eb3dd1a665ea642f3918020a53e5ecb673Devang Patel DI->setLocation(S.getRBracLoc()); 2064d939e64142126b872e39c11dc995aa993f137feDevang Patel DI->EmitRegionEnd(Builder); 2071c6a38bcea17801e9a4738753aee845381af2b6cSanjiv Gupta } 2081c6a38bcea17801e9a4738753aee845381af2b6cSanjiv Gupta 20917d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson RValue RV; 2101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!GetLast) 21117d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson RV = RValue::get(0); 21217d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson else { 2131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We have to special case labels here. They are statements, but when put 21417d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson // at the end of a statement expression, they yield the value of their 21517d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson // subexpression. Handle this by walking through all labels we encounter, 21617d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson // emitting them before we evaluate the subexpr. 21717d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson const Stmt *LastStmt = S.body_back(); 21817d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson while (const LabelStmt *LS = dyn_cast<LabelStmt>(LastStmt)) { 219ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner EmitLabel(LS->getDecl()); 22017d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson LastStmt = LS->getSubStmt(); 22117d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson } 2221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22317d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson EnsureInsertPoint(); 2241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 225558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall RV = EmitAnyExpr(cast<Expr>(LastStmt), AggSlot); 22691d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner } 227a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar 22817d28a3e0b0efaba14534d0e6d6a307283d96b9fAnders Carlsson return RV; 2295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 231aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbarvoid CodeGenFunction::SimplifyForwardingBlocks(llvm::BasicBlock *BB) { 232aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar llvm::BranchInst *BI = dyn_cast<llvm::BranchInst>(BB->getTerminator()); 2331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 234aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // If there is a cleanup stack, then we it isn't worth trying to 235aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // simplify this block (we would need to remove it from the scope map 236aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // and cleanup entry). 237f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (!EHStack.empty()) 238aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar return; 239aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar 240aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // Can only simplify direct branches. 241aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar if (!BI || !BI->isUnconditional()) 242aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar return; 243aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar 244aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar BB->replaceAllUsesWith(BI->getSuccessor(0)); 245aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar BI->eraseFromParent(); 246aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar BB->eraseFromParent(); 247aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar} 248aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar 249a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbarvoid CodeGenFunction::EmitBlock(llvm::BasicBlock *BB, bool IsFinished) { 250548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); 251548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall 252d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // Fall out of the current block (if necessary). 253d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar EmitBranch(BB); 254a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar 255a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar if (IsFinished && BB->use_empty()) { 256a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar delete BB; 257a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar return; 258a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar } 259a0c21a8faa79e88ac432d116eca58f7a7217195dDaniel Dunbar 260839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall // Place the block after the current block, if possible, or else at 261839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall // the end of the function. 262548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall if (CurBB && CurBB->getParent()) 263548ce5e78215a34f409d597bb2c1e9f897a8eda3John McCall CurFn->getBasicBlockList().insertAfter(CurBB, BB); 264839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall else 265839cbaa004a24e8f1ea14db5ed76e3d25ed28996John McCall CurFn->getBasicBlockList().push_back(BB); 266d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar Builder.SetInsertPoint(BB); 267d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar} 268d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar 269d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbarvoid CodeGenFunction::EmitBranch(llvm::BasicBlock *Target) { 270d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // Emit a branch from the current block to the target one if this 271d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // was a real block. If this was just a fall-through block after a 272d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // terminator, don't emit it. 273d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); 274d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar 275d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar if (!CurBB || CurBB->getTerminator()) { 276d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // If there is no insert point or the previous block is already 277d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar // terminated, don't touch it. 2785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 2795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, create a fall-through branch. 280d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar Builder.CreateBr(Target); 2815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2825e08ad3cc62ab94649959ae227a9a411a729bf49Daniel Dunbar 2835e08ad3cc62ab94649959ae227a9a411a729bf49Daniel Dunbar Builder.ClearInsertionPoint(); 2845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 286f1549f66a8216a78112286e3978cea2c29d6334cJohn McCallCodeGenFunction::JumpDest 287ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris LattnerCodeGenFunction::getJumpDestForLabel(const LabelDecl *D) { 288ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner JumpDest &Dest = LabelMap[D]; 289ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (Dest.isValid()) return Dest; 290f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 291f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Create, but don't insert, the new block. 292ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Dest = JumpDest(createBasicBlock(D->getName()), 293ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EHScopeStack::stable_iterator::invalid(), 294ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall NextCleanupDestIndex++); 295f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall return Dest; 296f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall} 297f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 298ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattnervoid CodeGenFunction::EmitLabel(const LabelDecl *D) { 299ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner JumpDest &Dest = LabelMap[D]; 300f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 301ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall // If we didn't need a forward reference to this label, just go 302f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // ahead and create a destination at the current scope. 303ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (!Dest.isValid()) { 304ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner Dest = getJumpDestInCurrentScope(D->getName()); 305f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 306f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Otherwise, we need to give this label a target depth and remove 307f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // it from the branch-fixups list. 308f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } else { 309ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall assert(!Dest.getScopeDepth().isValid() && "already emitted label!"); 310ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall Dest = JumpDest(Dest.getBlock(), 311ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EHStack.stable_begin(), 312ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall Dest.getDestIndex()); 313f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 314ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall ResolveBranchFixups(Dest.getBlock()); 315f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 316f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 317ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(Dest.getBlock()); 31891d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner} 31991d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner 32091d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattner 32191d723da7b68be5245c3ac58aa2a36d04658cfb8Chris Lattnervoid CodeGenFunction::EmitLabelStmt(const LabelStmt &S) { 322ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner EmitLabel(S.getDecl()); 3235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitStmt(S.getSubStmt()); 3245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitGotoStmt(const GotoStmt &S) { 3270912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // If this code is reachable then emit a stop point (if generating 3280912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // debug info). We have to do this ourselves because we are on the 3290912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // "simple" statement path. 3300912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (HaveInsertPoint()) 3310912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(&S); 33236a2ada69fdb457b0e46d0ef452c150b360d8888Mike Stump 333f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranchThroughCleanup(getJumpDestForLabel(S.getLabel())); 3345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 3355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3363d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3370ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbarvoid CodeGenFunction::EmitIndirectGotoStmt(const IndirectGotoStmt &S) { 338ad8dcf4a9df0e24051dc31bf9e6f3cd138a34298Chris Lattner if (const LabelDecl *Target = S.getConstantTarget()) { 33995c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall EmitBranchThroughCleanup(getJumpDestForLabel(Target)); 34095c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall return; 34195c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall } 34295c225de9fa3d79f70ef5008c0279580a7d9dcadJohn McCall 34349c952f853fe2d15dd9c9ff2a29c696bd18fca13Chris Lattner // Ensure that we have an i8* for our PHI node. 344d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner llvm::Value *V = Builder.CreateBitCast(EmitScalarExpr(S.getTarget()), 345d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Int8PtrTy, "addr"); 3463d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); 3473d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3483d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3493d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner // Get the basic block for the indirect goto. 3503d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner llvm::BasicBlock *IndGotoBB = GetIndirectGotoBlock(); 3513d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3523d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner // The first instruction in the block has to be the PHI for the switch dest, 3533d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner // add an entry for this branch. 3543d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner cast<llvm::PHINode>(IndGotoBB->begin())->addIncoming(V, CurBB); 3553d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner 3563d00fdc82fd550ae4bfbb2e700a1fc85bbd6d6fdChris Lattner EmitBranch(IndGotoBB); 3570ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar} 3580ffb125996336fc7602b162c0a9e392f1a93060fDaniel Dunbar 35962b72f642207ba2ba433d686df924dc9594e9897Chris Lattnervoid CodeGenFunction::EmitIfStmt(const IfStmt &S) { 3605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.4.1: The first substatement is executed if the expression compares 3615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // unequal to 0. The condition must be a scalar type. 362f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 36301234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor 3648cfe5a784133d90bf329fd20801824a6f71bb8caDouglas Gregor if (S.getConditionVariable()) 365b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 3661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3679bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // If the condition constant folds and can be elided, try to avoid emitting 3689bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // the condition and the dead arm of the if/else. 369c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner bool CondConstant; 370c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner if (ConstantFoldsToSimpleInteger(S.getCond(), CondConstant)) { 37162b72f642207ba2ba433d686df924dc9594e9897Chris Lattner // Figure out which block (then or else) is executed. 372c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner const Stmt *Executed = S.getThen(); 373c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner const Stmt *Skipped = S.getElse(); 374c2c90011a688c04a4e980282f08c267e081c4b00Chris Lattner if (!CondConstant) // Condition false? 37562b72f642207ba2ba433d686df924dc9594e9897Chris Lattner std::swap(Executed, Skipped); 3761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 37762b72f642207ba2ba433d686df924dc9594e9897Chris Lattner // If the skipped block has no labels in it, just emit the executed block. 37862b72f642207ba2ba433d686df924dc9594e9897Chris Lattner // This avoids emitting dead code and simplifies the CFG substantially. 3799bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner if (!ContainsLabel(Skipped)) { 38001234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor if (Executed) { 381f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ExecutedScope(*this); 38262b72f642207ba2ba433d686df924dc9594e9897Chris Lattner EmitStmt(Executed); 38301234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor } 38462b72f642207ba2ba433d686df924dc9594e9897Chris Lattner return; 38562b72f642207ba2ba433d686df924dc9594e9897Chris Lattner } 38662b72f642207ba2ba433d686df924dc9594e9897Chris Lattner } 3879bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner 3889bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // Otherwise, the condition did not fold, or we couldn't elide it. Just emit 3899bc47e29dce8f095be7a6d07dbb02a5a7a112949Chris Lattner // the conditional branch. 390781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar llvm::BasicBlock *ThenBlock = createBasicBlock("if.then"); 391781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar llvm::BasicBlock *ContBlock = createBasicBlock("if.end"); 392781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar llvm::BasicBlock *ElseBlock = ContBlock; 3935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (S.getElse()) 394781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar ElseBlock = createBasicBlock("if.else"); 395781d7ca9b2fd626ef34bdc3fe06765eeff7ab2bcDaniel Dunbar EmitBranchOnBoolExpr(S.getCond(), ThenBlock, ElseBlock); 3961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the 'then' code. 39801234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor EmitBlock(ThenBlock); 39901234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor { 400f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ThenScope(*this); 40101234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor EmitStmt(S.getThen()); 40201234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor } 403d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar EmitBranch(ContBlock); 4041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the 'else' code if present. 4065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (const Stmt *Else = S.getElse()) { 407acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel // There is no need to emit line number for unconditional branch. 408acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel if (getDebugInfo()) 409acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel Builder.SetCurrentDebugLocation(llvm::DebugLoc()); 4105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitBlock(ElseBlock); 41101234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor { 412f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ElseScope(*this); 41301234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor EmitStmt(Else); 41401234bbc1cb94946df8046ad95e17537082b4f71Douglas Gregor } 415acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel // There is no need to emit line number for unconditional branch. 416acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel if (getDebugInfo()) 417acd723666777b4ac1f79a97b6a300e6cf919d519Devang Patel Builder.SetCurrentDebugLocation(llvm::DebugLoc()); 418d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar EmitBranch(ContBlock); 4195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the continuation block for code after the if. 422c22d665ede76f70228055d638a087f4bd438292dDaniel Dunbar EmitBlock(ContBlock, true); 4235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 4245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitWhileStmt(const WhileStmt &S) { 426f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Emit the header for the loop, which will also become 427f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // the continue target. 428f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopHeader = getJumpDestInCurrentScope("while.cond"); 429ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopHeader.getBlock()); 430f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 431f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Create an exit block for when the condition fails, which will 432f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // also become the break target. 433f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopExit = getJumpDestInCurrentScope("while.end"); 43472cac2ccce8058833f56358e3391e28a8ddeeaa4Mike Stump 43572cac2ccce8058833f56358e3391e28a8ddeeaa4Mike Stump // Store the blocks to use for break and continue. 436f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(LoopExit, LoopHeader)); 4371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4385656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // C++ [stmt.while]p2: 4395656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // When the condition of a while statement is a declaration, the 4405656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // scope of the variable that is declared extends from its point 4415656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // of declaration (3.3.2) to the end of the while statement. 4425656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // [...] 4435656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // The object created in a condition is destroyed and created 4445656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor // with each iteration of the loop. 445f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 4465656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 447f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (S.getConditionVariable()) 448b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 4495656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 45016b16206741f5139c4ad870632db8f9ea4c6c943Mike Stump // Evaluate the conditional in the while header. C99 6.8.5.1: The 45116b16206741f5139c4ad870632db8f9ea4c6c943Mike Stump // evaluation of the controlling expression takes place before each 45216b16206741f5139c4ad870632db8f9ea4c6c943Mike Stump // execution of the loop body. 4535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond()); 4545656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 4552c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel // while(1) is common, avoid extra exit blocks. Be sure 4565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // to correctly handle break/continue though. 4572c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel bool EmitBoolCondBranch = true; 4581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (llvm::ConstantInt *C = dyn_cast<llvm::ConstantInt>(BoolCondVal)) 4592c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel if (C->isOne()) 4602c30d8fee8981ca4f20a477456dae1b722b53f1dDevang Patel EmitBoolCondBranch = false; 4611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // As long as the condition is true, go to the loop body. 463f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall llvm::BasicBlock *LoopBody = createBasicBlock("while.body"); 464f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (EmitBoolCondBranch) { 465ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall llvm::BasicBlock *ExitBlock = LoopExit.getBlock(); 466f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (ConditionScope.requiresCleanups()) 467f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ExitBlock = createBasicBlock("while.exit"); 468f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 469f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall Builder.CreateCondBr(BoolCondVal, LoopBody, ExitBlock); 470f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 471ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (ExitBlock != LoopExit.getBlock()) { 472f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(ExitBlock); 473f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranchThroughCleanup(LoopExit); 474f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 475f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 4765656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 477f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Emit the loop body. We have to emit this in a cleanup scope 478f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // because it might be a singleton DeclStmt. 4795656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor { 480f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope BodyScope(*this); 4815656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor EmitBlock(LoopBody); 4825656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor EmitStmt(S.getBody()); 4835656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor } 484da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 4851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump BreakContinueStack.pop_back(); 4861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 487f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Immediately force cleanup. 488f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ConditionScope.ForceCleanup(); 4895656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 490f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Branch to the loop header again. 491ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBranch(LoopHeader.getBlock()); 4921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the exit block. 494ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopExit.getBlock(), true); 4955656e14d91405417182171a705ed3e3d2d6d7aa3Douglas Gregor 496aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // The LoopHeader typically is just a branch if we skipped emitting 497aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // a branch, try to erase it. 498f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (!EmitBoolCondBranch) 499ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall SimplifyForwardingBlocks(LoopHeader.getBlock()); 5005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitDoStmt(const DoStmt &S) { 503f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopExit = getJumpDestInCurrentScope("do.end"); 504f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopCond = getJumpDestInCurrentScope("do.cond"); 5051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 506da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner // Store the blocks to use for break and continue. 507f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(LoopExit, LoopCond)); 5081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 509f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Emit the body of the loop. 510f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall llvm::BasicBlock *LoopBody = createBasicBlock("do.body"); 511f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(LoopBody); 512f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall { 513f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope BodyScope(*this); 514f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitStmt(S.getBody()); 515f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 5161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 517e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson BreakContinueStack.pop_back(); 5181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 519ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopCond.getBlock()); 5201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.5.2: "The evaluation of the controlling expression takes place 5225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // after each execution of the loop body." 5231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Evaluate the conditional in the while header. 5255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.5p2/p4: The first substatement is executed if the expression 5265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // compares unequal to 0. The condition must be a scalar type. 5275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond()); 52805f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel 52905f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel // "do {} while (0)" is common in macros, avoid extra blocks. Be sure 53005f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel // to correctly handle break/continue though. 53105f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel bool EmitBoolCondBranch = true; 5321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (llvm::ConstantInt *C = dyn_cast<llvm::ConstantInt>(BoolCondVal)) 53305f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel if (C->isZero()) 53405f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel EmitBoolCondBranch = false; 53505f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel 5365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // As long as the condition is true, iterate the loop. 53705f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel if (EmitBoolCondBranch) 538ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall Builder.CreateCondBr(BoolCondVal, LoopBody, LoopExit.getBlock()); 5391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the exit block. 541ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopExit.getBlock()); 54205f6e6bb3a3e8e604c64f04f4ba7ef0e7569cf4eDevang Patel 543aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // The DoCond block typically is just a branch if we skipped 544aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar // emitting a branch, try to erase it. 545aa5bd87f1fd5f9ca47924248817c89325759b30eDaniel Dunbar if (!EmitBoolCondBranch) 546ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall SimplifyForwardingBlocks(LoopCond.getBlock()); 5475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitForStmt(const ForStmt &S) { 550f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest LoopExit = getJumpDestInCurrentScope("for.end"); 551f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 552f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ForScope(*this); 553da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 5540554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel CGDebugInfo *DI = getDebugInfo(); 5550554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel if (DI) { 5560554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel DI->setLocation(S.getSourceRange().getBegin()); 5570554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel DI->EmitRegionStart(Builder); 5580554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel } 5590554e0e30d24d9ad7d5e12f8e7583ebb5c9715bfDevang Patel 5605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Evaluate the first part before the loop. 5615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (S.getInit()) 5625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitStmt(S.getInit()); 5635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Start the loop with a block that tests the condition. 565f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If there's an increment, the continue scope will be overwritten 566f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // later. 567f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest Continue = getJumpDestInCurrentScope("for.cond"); 568ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall llvm::BasicBlock *CondBlock = Continue.getBlock(); 5695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer EmitBlock(CondBlock); 5705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 571d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor // Create a cleanup scope for the condition variable cleanups. 572f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 57399e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 574d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor llvm::Value *BoolCondVal = 0; 5755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (S.getCond()) { 57699e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor // If the for statement has a condition scope, emit the local variable 57799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor // declaration. 578ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall llvm::BasicBlock *ExitBlock = LoopExit.getBlock(); 579d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor if (S.getConditionVariable()) { 580b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 581d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor } 582f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 583f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If there are any cleanups between here and the loop-exit scope, 584f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // create a block to stage a loop exit along. 585f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (ForScope.requiresCleanups()) 586f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ExitBlock = createBasicBlock("for.cond.cleanup"); 58799e9b4d172f6877e6ba5ebe75bb8238721f5e01cDouglas Gregor 58831a0984b5cb4af99d2407c0f25bf5af68df681c6Chris Lattner // As long as the condition is true, iterate the loop. 5899615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ForBody = createBasicBlock("for.body"); 5901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // C99 6.8.5p2/p4: The first substatement is executed if the expression 5925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // compares unequal to 0. The condition must be a scalar type. 593d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor BoolCondVal = EvaluateExprAsBool(S.getCond()); 594f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall Builder.CreateCondBr(BoolCondVal, ForBody, ExitBlock); 595f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 596ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall if (ExitBlock != LoopExit.getBlock()) { 597f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(ExitBlock); 598f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranchThroughCleanup(LoopExit); 599f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 6001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitBlock(ForBody); 6025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 6035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Treat it as a non-zero constant. Don't even create a new block for the 6045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // body, just fall into it. 6055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the for loop doesn't have an increment we can just use the 608f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // condition as the continue block. Otherwise we'll need to create 609f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // a block for it (in the current scope, i.e. in the scope of the 610f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // condition), and that we will become our continue block. 611da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner if (S.getInc()) 612f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall Continue = getJumpDestInCurrentScope("for.inc"); 6131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 614da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner // Store the blocks to use for break and continue. 615f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(LoopExit, Continue)); 6163e9da66ac7e88d64d30ee777588677320660cf84Mike Stump 617d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor { 618d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor // Create a separate cleanup scope for the body, in case it is not 619d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor // a compound statement. 620f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope BodyScope(*this); 621d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor EmitStmt(S.getBody()); 622d975206755e26a391f4a1cd8bf8f96a6a65b05e6Douglas Gregor } 623da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 6245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If there is an increment, emit it next. 625ad12b6d643aba6c36f5cec4c9beb4977a12eace4Daniel Dunbar if (S.getInc()) { 626ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(Continue.getBlock()); 627883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner EmitStmt(S.getInc()); 628ad12b6d643aba6c36f5cec4c9beb4977a12eace4Daniel Dunbar } 6291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 63045d3fe1898d3726d269a0bd2ccb8527102e29d79Douglas Gregor BreakContinueStack.pop_back(); 631f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 632f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ConditionScope.ForceCleanup(); 633f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBranch(CondBlock); 634f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 635f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall ForScope.ForceCleanup(); 636f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 637bbd9fa4b4a0fea47f94ac3eb4eaf5cc8079defe1Devang Patel if (DI) { 638bbd9fa4b4a0fea47f94ac3eb4eaf5cc8079defe1Devang Patel DI->setLocation(S.getSourceRange().getEnd()); 6394d939e64142126b872e39c11dc995aa993f137feDevang Patel DI->EmitRegionEnd(Builder); 640bbd9fa4b4a0fea47f94ac3eb4eaf5cc8079defe1Devang Patel } 6415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 642da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner // Emit the fall-through block. 643ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(LoopExit.getBlock(), true); 6445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 646ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smithvoid CodeGenFunction::EmitCXXForRangeStmt(const CXXForRangeStmt &S) { 647ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith JumpDest LoopExit = getJumpDestInCurrentScope("for.end"); 648ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 649ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RunCleanupsScope ForScope(*this); 650ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 651ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith CGDebugInfo *DI = getDebugInfo(); 652ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DI) { 653ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DI->setLocation(S.getSourceRange().getBegin()); 654ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DI->EmitRegionStart(Builder); 655ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 656ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 657ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Evaluate the first pieces before the loop. 658ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getRangeStmt()); 659ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getBeginEndStmt()); 660ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 661ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Start the loop with a block that tests the condition. 662ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // If there's an increment, the continue scope will be overwritten 663ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // later. 664ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::BasicBlock *CondBlock = createBasicBlock("for.cond"); 665ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(CondBlock); 666ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 667ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // If there are any cleanups between here and the loop-exit scope, 668ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // create a block to stage a loop exit along. 669ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::BasicBlock *ExitBlock = LoopExit.getBlock(); 670ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (ForScope.requiresCleanups()) 671ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ExitBlock = createBasicBlock("for.cond.cleanup"); 672ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 673ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // The loop body, consisting of the specified body and the loop variable. 674ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::BasicBlock *ForBody = createBasicBlock("for.body"); 675ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 676ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // The body is executed if the expression, contextually converted 677ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // to bool, is true. 678ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond()); 679ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith Builder.CreateCondBr(BoolCondVal, ForBody, ExitBlock); 680ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 681ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (ExitBlock != LoopExit.getBlock()) { 682ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(ExitBlock); 683ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBranchThroughCleanup(LoopExit); 684ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 685ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 686ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(ForBody); 687ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 688ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Create a block for the increment. In case of a 'continue', we jump there. 689ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith JumpDest Continue = getJumpDestInCurrentScope("for.inc"); 690ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 691ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Store the blocks to use for break and continue. 692ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BreakContinueStack.push_back(BreakContinue(LoopExit, Continue)); 693ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 694ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith { 695ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Create a separate cleanup scope for the loop variable and body. 696ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith RunCleanupsScope BodyScope(*this); 697ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getLoopVarStmt()); 698ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getBody()); 699ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 700ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 701ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // If there is an increment, emit it next. 702ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(Continue.getBlock()); 703ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitStmt(S.getInc()); 704ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 705ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith BreakContinueStack.pop_back(); 706ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 707ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBranch(CondBlock); 708ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 709ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith ForScope.ForceCleanup(); 710ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 711ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith if (DI) { 712ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DI->setLocation(S.getSourceRange().getEnd()); 713ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith DI->EmitRegionEnd(Builder); 714ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith } 715ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 716ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith // Emit the fall-through block. 717ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith EmitBlock(LoopExit.getBlock(), true); 718ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith} 719ad762fcdc16b9e4705b12b09d92b8c026212b906Richard Smith 72029e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbarvoid CodeGenFunction::EmitReturnOfRValue(RValue RV, QualType Ty) { 72129e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar if (RV.isScalar()) { 72229e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar Builder.CreateStore(RV.getScalarVal(), ReturnValue); 72329e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar } else if (RV.isAggregate()) { 72429e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar EmitAggregateCopy(ReturnValue, RV.getAggregateAddr(), Ty); 72529e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar } else { 72629e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar StoreComplexToAddr(RV.getComplexVal(), ReturnValue, false); 72729e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar } 72882d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(ReturnBlock); 72929e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar} 73029e0bccf2bcce22b877f8b2ed173f564c116b97eDaniel Dunbar 7315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// EmitReturnStmt - Note that due to GCC extensions, this can have an operand 7325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// if the function returns void, or may be missing one if the function returns 7335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// non-void. Fun stuff :). 7345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitReturnStmt(const ReturnStmt &S) { 7355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emit the result value, even if unused, to evalute the side effects. 7365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const Expr *RV = S.getRetValue(); 7371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7385ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // FIXME: Clean this up by using an LValue for ReturnTemp, 7395ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // EmitStoreThroughLValue, and EmitAnyExpr. 740d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor if (S.getNRVOCandidate() && S.getNRVOCandidate()->isNRVOVariable() && 741d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor !Target.useGlobalsForAutomaticVariables()) { 742d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor // Apply the named return value optimization for this return statement, 743d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor // which means doing nothing: the appropriate result has already been 744d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor // constructed into the NRVO variable. 7453d91bbcdab155181556969cad6ec97014405acedDouglas Gregor 7463d91bbcdab155181556969cad6ec97014405acedDouglas Gregor // If there is an NRVO flag for this variable, set it to 1 into indicate 7473d91bbcdab155181556969cad6ec97014405acedDouglas Gregor // that the cleanup code should not destroy the variable. 748d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall if (llvm::Value *NRVOFlag = NRVOFlags[S.getNRVOCandidate()]) 749d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Builder.CreateStore(Builder.getTrue(), NRVOFlag); 750d86c477fb5d3fc34864afecbbb5443da9355e8fbDouglas Gregor } else if (!ReturnValue) { 7515ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // Make sure not to return anything, but evaluate the expression 7525ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // for side effects. 7535ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar if (RV) 754144ac61f9005a0da4327d4e62a4c453923b7bc0cEli Friedman EmitAnyExpr(RV); 7555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else if (RV == 0) { 7565ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar // Do nothing (return value is left uninitialized) 757d54b6ac2f4f6f0bd0076cbfa885b57277066f06cEli Friedman } else if (FnRetTy->isReferenceType()) { 758d54b6ac2f4f6f0bd0076cbfa885b57277066f06cEli Friedman // If this function returns a reference, take the address of the expression 759d54b6ac2f4f6f0bd0076cbfa885b57277066f06cEli Friedman // rather than the value. 76032f36baa6c8d491c374af622b4e3ac28d597453cAnders Carlsson RValue Result = EmitReferenceBindingToExpr(RV, /*InitializedDecl=*/0); 76133fd1fc1814a5573c972840d49317989e20deaceDouglas Gregor Builder.CreateStore(Result.getScalarVal(), ReturnValue); 7624b0029d5f8742760981a3bd58004f75454090a61Chris Lattner } else if (!hasAggregateLLVMType(RV->getType())) { 7635ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar Builder.CreateStore(EmitScalarExpr(RV), ReturnValue); 7649b2dc287177394a8f73833e2ad4f7ca8cd6f22bbChris Lattner } else if (RV->getType()->isAnyComplexType()) { 7655ca2084cf9b529563209429857f01fdae9dcdfa5Daniel Dunbar EmitComplexExprIntoAddr(RV, ReturnValue, false); 7665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 767558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall EmitAggExpr(RV, AggValueSlot::forAddr(ReturnValue, false, true)); 7685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 769144ac61f9005a0da4327d4e62a4c453923b7bc0cEli Friedman 77082d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(ReturnBlock); 7715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencervoid CodeGenFunction::EmitDeclStmt(const DeclStmt &S) { 77425b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar // As long as debug info is modeled with instructions, we have to ensure we 77525b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar // have a place to insert here and write the stop point here. 77625b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar if (getDebugInfo()) { 77725b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar EnsureInsertPoint(); 77825b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar EmitStopPoint(&S); 77925b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar } 78025b6ebf0f8c07514250ec76c987f84b6810d4d17Daniel Dunbar 781e4ea1f42c97a436df3e0ae8e129e6bc624ee6790Ted Kremenek for (DeclStmt::const_decl_iterator I = S.decl_begin(), E = S.decl_end(); 782e4ea1f42c97a436df3e0ae8e129e6bc624ee6790Ted Kremenek I != E; ++I) 783e4ea1f42c97a436df3e0ae8e129e6bc624ee6790Ted Kremenek EmitDecl(**I); 7846fa5f0943a84233b2e1ec9716eae55643225bfd4Chris Lattner} 785da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 7860912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarvoid CodeGenFunction::EmitBreakStmt(const BreakStmt &S) { 787da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner assert(!BreakContinueStack.empty() && "break stmt not in a loop or switch!"); 788da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 7890912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // If this code is reachable then emit a stop point (if generating 7900912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // debug info). We have to do this ourselves because we are on the 7910912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // "simple" statement path. 7920912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (HaveInsertPoint()) 7930912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(&S); 794ec9771d57f94cc204491b3174e88069d08cdd684Mike Stump 795f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest Block = BreakContinueStack.back().BreakBlock; 79682d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(Block); 797da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner} 798da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 7990912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbarvoid CodeGenFunction::EmitContinueStmt(const ContinueStmt &S) { 800da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner assert(!BreakContinueStack.empty() && "continue stmt not in a loop!"); 801da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner 8020912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // If this code is reachable then emit a stop point (if generating 8030912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // debug info). We have to do this ourselves because we are on the 8040912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // "simple" statement path. 8050912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar if (HaveInsertPoint()) 8060912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar EmitStopPoint(&S); 807ec9771d57f94cc204491b3174e88069d08cdd684Mike Stump 808f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest Block = BreakContinueStack.back().ContinueBlock; 80982d8ef0be44ddba608c1ce5c8b6b48da83bc1821Anders Carlsson EmitBranchThroughCleanup(Block); 810da13870e99fe33934b2122f06528a5063f78ae4cChris Lattner} 81151b09f2c528c8460b5465c676173324e44176d62Devang Patel 812c049e4f406a7f7179eba98659044a32508e53289Devang Patel/// EmitCaseStmtRange - If case statement range is not too big then 813c049e4f406a7f7179eba98659044a32508e53289Devang Patel/// add multiple cases to switch instruction, one for each value within 814c049e4f406a7f7179eba98659044a32508e53289Devang Patel/// the range. If range is too big then emit "if" condition check. 815c049e4f406a7f7179eba98659044a32508e53289Devang Patelvoid CodeGenFunction::EmitCaseStmtRange(const CaseStmt &S) { 8164efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar assert(S.getRHS() && "Expected RHS value in CaseStmt"); 817c049e4f406a7f7179eba98659044a32508e53289Devang Patel 81851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt LHS = S.getLHS()->EvaluateAsInt(getContext()); 81951fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson llvm::APSInt RHS = S.getRHS()->EvaluateAsInt(getContext()); 8204efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar 82116f23570999cac1fa13597386938450843003840Daniel Dunbar // Emit the code for this case. We do this first to make sure it is 82216f23570999cac1fa13597386938450843003840Daniel Dunbar // properly chained from our predecessor before generating the 82316f23570999cac1fa13597386938450843003840Daniel Dunbar // switch machinery to enter this block. 824f84dcda7e2ab2f6d5be5a8c52d22ef4c442dd762Daniel Dunbar EmitBlock(createBasicBlock("sw.bb")); 82516f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *CaseDest = Builder.GetInsertBlock(); 82616f23570999cac1fa13597386938450843003840Daniel Dunbar EmitStmt(S.getSubStmt()); 82716f23570999cac1fa13597386938450843003840Daniel Dunbar 8284efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar // If range is empty, do nothing. 8294efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar if (LHS.isSigned() ? RHS.slt(LHS) : RHS.ult(LHS)) 8304efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar return; 831c049e4f406a7f7179eba98659044a32508e53289Devang Patel 832c049e4f406a7f7179eba98659044a32508e53289Devang Patel llvm::APInt Range = RHS - LHS; 83316f23570999cac1fa13597386938450843003840Daniel Dunbar // FIXME: parameters such as this should not be hardcoded. 834c049e4f406a7f7179eba98659044a32508e53289Devang Patel if (Range.ult(llvm::APInt(Range.getBitWidth(), 64))) { 835c049e4f406a7f7179eba98659044a32508e53289Devang Patel // Range is small enough to add multiple switch instruction cases. 8364efde8d2c10b091bc9588de18c2c71dca2979e49Daniel Dunbar for (unsigned i = 0, e = Range.getZExtValue() + 1; i != e; ++i) { 83797d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(Builder.getInt(LHS), CaseDest); 8382d79d0f3ac0ea77b7bdfc3dd11de8cc3ccd91b8cDevang Patel LHS++; 8392d79d0f3ac0ea77b7bdfc3dd11de8cc3ccd91b8cDevang Patel } 840c049e4f406a7f7179eba98659044a32508e53289Devang Patel return; 8411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 8421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 84316f23570999cac1fa13597386938450843003840Daniel Dunbar // The range is too big. Emit "if" condition into a new block, 84416f23570999cac1fa13597386938450843003840Daniel Dunbar // making sure to save and restore the current insertion point. 84516f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *RestoreBB = Builder.GetInsertBlock(); 84616f23570999cac1fa13597386938450843003840Daniel Dunbar 84716f23570999cac1fa13597386938450843003840Daniel Dunbar // Push this test onto the chain of range checks (which terminates 84816f23570999cac1fa13597386938450843003840Daniel Dunbar // in the default basic block). The switch's default will be changed 84916f23570999cac1fa13597386938450843003840Daniel Dunbar // to the top of this chain after switch emission is complete. 85016f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *FalseDest = CaseRangeBlock; 85155e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar CaseRangeBlock = createBasicBlock("sw.caserange"); 85216f23570999cac1fa13597386938450843003840Daniel Dunbar 85316f23570999cac1fa13597386938450843003840Daniel Dunbar CurFn->getBasicBlockList().push_back(CaseRangeBlock); 85416f23570999cac1fa13597386938450843003840Daniel Dunbar Builder.SetInsertPoint(CaseRangeBlock); 855c049e4f406a7f7179eba98659044a32508e53289Devang Patel 856c049e4f406a7f7179eba98659044a32508e53289Devang Patel // Emit range check. 8571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::Value *Diff = 85897d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner Builder.CreateSub(SwitchInsn->getCondition(), Builder.getInt(LHS), "tmp"); 8591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::Value *Cond = 86097d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner Builder.CreateICmpULE(Diff, Builder.getInt(Range), "inbounds"); 861c049e4f406a7f7179eba98659044a32508e53289Devang Patel Builder.CreateCondBr(Cond, CaseDest, FalseDest); 862c049e4f406a7f7179eba98659044a32508e53289Devang Patel 86316f23570999cac1fa13597386938450843003840Daniel Dunbar // Restore the appropriate insertion point. 864a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar if (RestoreBB) 865a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar Builder.SetInsertPoint(RestoreBB); 866a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar else 867a448fb2da03ece39978784793eea68760e8205a1Daniel Dunbar Builder.ClearInsertionPoint(); 868c049e4f406a7f7179eba98659044a32508e53289Devang Patel} 8692d79d0f3ac0ea77b7bdfc3dd11de8cc3ccd91b8cDevang Patel 870c049e4f406a7f7179eba98659044a32508e53289Devang Patelvoid CodeGenFunction::EmitCaseStmt(const CaseStmt &S) { 871b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner // Handle case ranges. 872c049e4f406a7f7179eba98659044a32508e53289Devang Patel if (S.getRHS()) { 873c049e4f406a7f7179eba98659044a32508e53289Devang Patel EmitCaseStmtRange(S); 874c049e4f406a7f7179eba98659044a32508e53289Devang Patel return; 875c049e4f406a7f7179eba98659044a32508e53289Devang Patel } 8761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 87797d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner llvm::ConstantInt *CaseVal = 87897d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner Builder.getInt(S.getLHS()->EvaluateAsInt(getContext())); 87997d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner 880421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // If the body of the case is just a 'break', and if there was no fallthrough, 881421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // try to not emit an empty block. 882b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner if (isa<BreakStmt>(S.getSubStmt())) { 883b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner JumpDest Block = BreakContinueStack.back().BreakBlock; 884b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner 885b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner // Only do this optimization if there are no cleanups that need emitting. 886b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner if (isObviouslyBranchWithoutCleanups(Block)) { 88797d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(CaseVal, Block.getBlock()); 888421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner 889421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // If there was a fallthrough into this case, make sure to redirect it to 890421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner // the end of the switch as well. 891421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner if (Builder.GetInsertBlock()) { 892421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner Builder.CreateBr(Block.getBlock()); 893421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner Builder.ClearInsertionPoint(); 894421048698b6b6bf86754190bcfe98a0ed82ee5b5Chris Lattner } 895b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner return; 896b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner } 897b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner } 898b11f9198111796ada02b57f62cdea92134fde9f7Chris Lattner 899f84dcda7e2ab2f6d5be5a8c52d22ef4c442dd762Daniel Dunbar EmitBlock(createBasicBlock("sw.bb")); 900c049e4f406a7f7179eba98659044a32508e53289Devang Patel llvm::BasicBlock *CaseDest = Builder.GetInsertBlock(); 90197d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(CaseVal, CaseDest); 9021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9035512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // Recursively emitting the statement is acceptable, but is not wonderful for 9045512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // code where we have many case statements nested together, i.e.: 9055512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // case 1: 9065512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // case 2: 9075512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // case 3: etc. 9085512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // Handling this recursively will create a new block for each case statement 9095512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // that falls through to the next case which is IR intensive. It also causes 9105512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // deep recursion which can run into stack depth limitations. Handle 9115512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // sequential non-range case statements specially. 9125512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner const CaseStmt *CurCase = &S; 9135512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner const CaseStmt *NextCase = dyn_cast<CaseStmt>(S.getSubStmt()); 9145512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner 91597d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner // Otherwise, iteratively add consecutive cases to this switch stmt. 9165512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner while (NextCase && NextCase->getRHS() == 0) { 9175512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner CurCase = NextCase; 91897d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner llvm::ConstantInt *CaseVal = 91997d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner Builder.getInt(CurCase->getLHS()->EvaluateAsInt(getContext())); 92097d5437f48f8d935bf053915ab3d250edfe5fad5Chris Lattner SwitchInsn->addCase(CaseVal, CaseDest); 9215512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner NextCase = dyn_cast<CaseStmt>(CurCase->getSubStmt()); 9225512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner } 9231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9245512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner // Normal default recursion for non-cases. 9255512f28fa7b26e87e613dc1558b29b2a89647809Chris Lattner EmitStmt(CurCase->getSubStmt()); 92651b09f2c528c8460b5465c676173324e44176d62Devang Patel} 92751b09f2c528c8460b5465c676173324e44176d62Devang Patel 92851b09f2c528c8460b5465c676173324e44176d62Devang Patelvoid CodeGenFunction::EmitDefaultStmt(const DefaultStmt &S) { 92916f23570999cac1fa13597386938450843003840Daniel Dunbar llvm::BasicBlock *DefaultBlock = SwitchInsn->getDefaultDest(); 9301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(DefaultBlock->empty() && 93155e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar "EmitDefaultStmt: Default block already defined?"); 93216f23570999cac1fa13597386938450843003840Daniel Dunbar EmitBlock(DefaultBlock); 93351b09f2c528c8460b5465c676173324e44176d62Devang Patel EmitStmt(S.getSubStmt()); 93451b09f2c528c8460b5465c676173324e44176d62Devang Patel} 93551b09f2c528c8460b5465c676173324e44176d62Devang Patel 936fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// CollectStatementsForCase - Given the body of a 'switch' statement and a 937fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// constant value that is being switched on, see if we can dead code eliminate 938fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// the body of the switch to a simple series of statements to emit. Basically, 939fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// on a switch (5) we want to find these statements: 940fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// case 5: 941fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// printf(...); <-- 942fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// ++i; <-- 943fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// break; 944fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 945fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// and add them to the ResultStmts vector. If it is unsafe to do this 946fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// transformation (for example, one of the elided statements contains a label 947fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// that might be jumped to), return CSFC_Failure. If we handled it and 'S' 948fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// should include statements after it (e.g. the printf() line is a substmt of 949fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// the case) then return CSFC_FallThrough. If we handled it and found a break 950fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// statement, then return CSFC_Success. 951fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 952fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// If Case is non-null, then we are looking for the specified case, checking 953fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// that nothing we jump over contains labels. If Case is null, then we found 954fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// the case and are looking for the break. 955fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 956fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// If the recursive walk actually finds our Case, then we set FoundCase to 957fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// true. 958fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// 959fda0f1f5a278548b012401be07e287c1697fc41cChris Lattnerenum CSFC_Result { CSFC_Failure, CSFC_FallThrough, CSFC_Success }; 960fda0f1f5a278548b012401be07e287c1697fc41cChris Lattnerstatic CSFC_Result CollectStatementsForCase(const Stmt *S, 961fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const SwitchCase *Case, 962fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner bool &FoundCase, 963fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner llvm::SmallVectorImpl<const Stmt*> &ResultStmts) { 9643858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If this is a null statement, just succeed. 9653858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (S == 0) 9663858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return Case ? CSFC_Success : CSFC_FallThrough; 9673858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 968fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // If this is the switchcase (case 4: or default) that we're looking for, then 969fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // we're in business. Just add the substatement. 970fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (const SwitchCase *SC = dyn_cast<SwitchCase>(S)) { 971fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (S == Case) { 972fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner FoundCase = true; 973fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CollectStatementsForCase(SC->getSubStmt(), 0, FoundCase, 974fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts); 975fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 976fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 977fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Otherwise, this is some other case or default statement, just ignore it. 978fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CollectStatementsForCase(SC->getSubStmt(), Case, FoundCase, 979fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts); 980fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 9813858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 9823858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we are in the live part of the code and we found our break statement, 9833858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // return a success! 9843858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (Case == 0 && isa<BreakStmt>(S)) 9853858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return CSFC_Success; 986fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 9873858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If this is a switch statement, then it might contain the SwitchCase, the 9883858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // break, or neither. 9893858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (const CompoundStmt *CS = dyn_cast<CompoundStmt>(S)) { 9903858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // Handle this as two cases: we might be looking for the SwitchCase (if so 9913858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // the skipped statements must be skippable) or we might already have it. 9923858938b043bac2f046304ff99a54905acdcc6ddChris Lattner CompoundStmt::const_body_iterator I = CS->body_begin(), E = CS->body_end(); 9933858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (Case) { 9943f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // Keep track of whether we see a skipped declaration. The code could be 9953f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // using the declaration even if it is skipped, so we can't optimize out 9963f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // the decl if the kept statements might refer to it. 9973f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner bool HadSkippedDecl = false; 9983f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner 9993858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we're looking for the case, just see if we can skip each of the 10003858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // substatements. 10013858938b043bac2f046304ff99a54905acdcc6ddChris Lattner for (; Case && I != E; ++I) { 10023f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner HadSkippedDecl |= isa<DeclStmt>(I); 10033f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner 10043858938b043bac2f046304ff99a54905acdcc6ddChris Lattner switch (CollectStatementsForCase(*I, Case, FoundCase, ResultStmts)) { 10053858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Failure: return CSFC_Failure; 10063858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Success: 10073858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // A successful result means that either 1) that the statement doesn't 10083858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // have the case and is skippable, or 2) does contain the case value 10099467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner // and also contains the break to exit the switch. In the later case, 10109467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner // we just verify the rest of the statements are elidable. 10119467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner if (FoundCase) { 10123f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // If we found the case and skipped declarations, we can't do the 10133f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // optimization. 10143f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner if (HadSkippedDecl) 10153f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner return CSFC_Failure; 10163f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner 10179467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner for (++I; I != E; ++I) 10189467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner if (CodeGenFunction::ContainsLabel(*I, true)) 10199467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner return CSFC_Failure; 10209467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner return CSFC_Success; 10219467110fcef8a3e4caf9e5d022cff0322afe6e8bChris Lattner } 10223858938b043bac2f046304ff99a54905acdcc6ddChris Lattner break; 10233858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_FallThrough: 10243858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we have a fallthrough condition, then we must have found the 10253858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // case started to include statements. Consider the rest of the 10263858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // statements in the compound statement as candidates for inclusion. 10273858938b043bac2f046304ff99a54905acdcc6ddChris Lattner assert(FoundCase && "Didn't find case but returned fallthrough?"); 10283858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // We recursively found Case, so we're not looking for it anymore. 10293858938b043bac2f046304ff99a54905acdcc6ddChris Lattner Case = 0; 10303f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner 10313f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // If we found the case and skipped declarations, we can't do the 10323f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner // optimization. 10333f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner if (HadSkippedDecl) 10343f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner return CSFC_Failure; 10353858938b043bac2f046304ff99a54905acdcc6ddChris Lattner break; 10363858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10373858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10383858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10393858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 10403858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // If we have statements in our range, then we know that the statements are 10413858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // live and need to be added to the set of statements we're tracking. 10423858938b043bac2f046304ff99a54905acdcc6ddChris Lattner for (; I != E; ++I) { 10433858938b043bac2f046304ff99a54905acdcc6ddChris Lattner switch (CollectStatementsForCase(*I, 0, FoundCase, ResultStmts)) { 10443858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Failure: return CSFC_Failure; 10453858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_FallThrough: 10463858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // A fallthrough result means that the statement was simple and just 10473858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // included in ResultStmt, keep adding them afterwards. 10483858938b043bac2f046304ff99a54905acdcc6ddChris Lattner break; 10493858938b043bac2f046304ff99a54905acdcc6ddChris Lattner case CSFC_Success: 10503858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // A successful result means that we found the break statement and 10513858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // stopped statement inclusion. We just ensure that any leftover stmts 10523858938b043bac2f046304ff99a54905acdcc6ddChris Lattner // are skippable and return success ourselves. 10533858938b043bac2f046304ff99a54905acdcc6ddChris Lattner for (++I; I != E; ++I) 10543858938b043bac2f046304ff99a54905acdcc6ddChris Lattner if (CodeGenFunction::ContainsLabel(*I, true)) 10553858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return CSFC_Failure; 10563858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return CSFC_Success; 10573858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10583858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10593858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 10603858938b043bac2f046304ff99a54905acdcc6ddChris Lattner return Case ? CSFC_Success : CSFC_FallThrough; 10613858938b043bac2f046304ff99a54905acdcc6ddChris Lattner } 10623858938b043bac2f046304ff99a54905acdcc6ddChris Lattner 1063fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Okay, this is some other statement that we don't handle explicitly, like a 1064fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // for statement or increment etc. If we are skipping over this statement, 1065fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // just verify it doesn't have labels, which would make it invalid to elide. 1066fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (Case) { 10673f06e274736eab9821ce0dc2bd8e166fe0e3aa7eChris Lattner if (CodeGenFunction::ContainsLabel(S, true)) 1068fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CSFC_Failure; 1069fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CSFC_Success; 1070fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1071fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1072fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Otherwise, we want to include this statement. Everything is cool with that 1073fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // so long as it doesn't contain a break out of the switch we're in. 1074fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (CodeGenFunction::containsBreak(S)) return CSFC_Failure; 1075fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1076fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Otherwise, everything is great. Include the statement and tell the caller 1077fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // that we fall through and include the next statement as well. 1078fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts.push_back(S); 1079fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CSFC_FallThrough; 1080fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner} 1081fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1082fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// FindCaseStatementsForValue - Find the case statement being jumped to and 1083fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// then invoke CollectStatementsForCase to find the list of statements to emit 1084fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// for a switch on constant. See the comment above CollectStatementsForCase 1085fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner/// for more details. 1086fda0f1f5a278548b012401be07e287c1697fc41cChris Lattnerstatic bool FindCaseStatementsForValue(const SwitchStmt &S, 1087fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const llvm::APInt &ConstantCondValue, 1088fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner llvm::SmallVectorImpl<const Stmt*> &ResultStmts, 1089fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ASTContext &C) { 1090fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // First step, find the switch case that is being branched to. We can do this 1091fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // efficiently by scanning the SwitchCase list. 1092fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const SwitchCase *Case = S.getSwitchCaseList(); 1093fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const DefaultStmt *DefaultCase = 0; 1094fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1095fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner for (; Case; Case = Case->getNextSwitchCase()) { 1096fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // It's either a default or case. Just remember the default statement in 1097fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // case we're not jumping to any numbered cases. 1098fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (const DefaultStmt *DS = dyn_cast<DefaultStmt>(Case)) { 1099fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner DefaultCase = DS; 1100fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner continue; 1101fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1102fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1103fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Check to see if this case is the one we're looking for. 1104fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner const CaseStmt *CS = cast<CaseStmt>(Case); 1105fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Don't handle case ranges yet. 1106fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (CS->getRHS()) return false; 1107fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1108fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // If we found our case, remember it as 'case'. 1109fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (CS->getLHS()->EvaluateAsInt(C) == ConstantCondValue) 1110fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner break; 1111fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1112fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1113fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // If we didn't find a matching case, we use a default if it exists, or we 1114fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // elide the whole switch body! 1115fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (Case == 0) { 1116fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // It is safe to elide the body of the switch if it doesn't contain labels 1117fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // etc. If it is safe, return successfully with an empty ResultStmts list. 1118fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (DefaultCase == 0) 1119fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return !CodeGenFunction::ContainsLabel(&S); 1120fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner Case = DefaultCase; 1121fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1122fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1123fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Ok, we know which case is being jumped to, try to collect all the 1124fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // statements that follow it. This can fail for a variety of reasons. Also, 1125fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // check to see that the recursive walk actually found our case statement. 1126fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Insane cases like this can fail to find it in the recursive walk since we 1127fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // don't handle every stmt kind: 1128fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // switch (4) { 1129fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // while (1) { 1130fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // case 4: ... 1131fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner bool FoundCase = false; 1132fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return CollectStatementsForCase(S.getBody(), Case, FoundCase, 1133fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner ResultStmts) != CSFC_Failure && 1134fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner FoundCase; 1135fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner} 1136fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 113751b09f2c528c8460b5465c676173324e44176d62Devang Patelvoid CodeGenFunction::EmitSwitchStmt(const SwitchStmt &S) { 1138f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest SwitchExit = getJumpDestInCurrentScope("sw.epilog"); 1139f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 1140f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall RunCleanupsScope ConditionScope(*this); 1141d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor 1142d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor if (S.getConditionVariable()) 1143b6bbcc9995186799a60ce17d0c1acff31601653aJohn McCall EmitAutoVarDecl(*S.getConditionVariable()); 1144d3d5301c44138b92bf01286183f5bf310cdd37cfDouglas Gregor 1145fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // See if we can constant fold the condition of the switch and therefore only 1146fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // emit the live case statement (if any) of the switch. 1147fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner llvm::APInt ConstantCondValue; 1148fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (ConstantFoldsToSimpleInteger(S.getCond(), ConstantCondValue)) { 1149fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner llvm::SmallVector<const Stmt*, 4> CaseStmts; 1150fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner if (FindCaseStatementsForValue(S, ConstantCondValue, CaseStmts, 1151fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner getContext())) { 1152fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner RunCleanupsScope ExecutedScope(*this); 1153fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 1154fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // Okay, we can dead code eliminate everything except this case. Emit the 1155fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner // specified series of statements and we're good. 1156fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner for (unsigned i = 0, e = CaseStmts.size(); i != e; ++i) 1157fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner EmitStmt(CaseStmts[i]); 1158fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner return; 1159fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1160fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner } 1161fda0f1f5a278548b012401be07e287c1697fc41cChris Lattner 116251b09f2c528c8460b5465c676173324e44176d62Devang Patel llvm::Value *CondV = EmitScalarExpr(S.getCond()); 116351b09f2c528c8460b5465c676173324e44176d62Devang Patel 116451b09f2c528c8460b5465c676173324e44176d62Devang Patel // Handle nested switch statements. 116551b09f2c528c8460b5465c676173324e44176d62Devang Patel llvm::SwitchInst *SavedSwitchInsn = SwitchInsn; 1166c049e4f406a7f7179eba98659044a32508e53289Devang Patel llvm::BasicBlock *SavedCRBlock = CaseRangeBlock; 116751b09f2c528c8460b5465c676173324e44176d62Devang Patel 116816f23570999cac1fa13597386938450843003840Daniel Dunbar // Create basic block to hold stuff that comes after switch 116916f23570999cac1fa13597386938450843003840Daniel Dunbar // statement. We also need to create a default block now so that 117016f23570999cac1fa13597386938450843003840Daniel Dunbar // explicit case ranges tests can have a place to jump to on 117116f23570999cac1fa13597386938450843003840Daniel Dunbar // failure. 117255e874299f2ad827646a4ca9ea38c402aaeb38c9Daniel Dunbar llvm::BasicBlock *DefaultBlock = createBasicBlock("sw.default"); 117316f23570999cac1fa13597386938450843003840Daniel Dunbar SwitchInsn = Builder.CreateSwitch(CondV, DefaultBlock); 117416f23570999cac1fa13597386938450843003840Daniel Dunbar CaseRangeBlock = DefaultBlock; 117551b09f2c528c8460b5465c676173324e44176d62Devang Patel 11760912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar // Clear the insertion point to indicate we are in unreachable code. 11770912425f79418a215c2fbd2d8fc9511244a4aa46Daniel Dunbar Builder.ClearInsertionPoint(); 1178d28a80d64616b66c91d28bb4c08ca2d8c594de4eEli Friedman 1179e9b8c0a38549692f1b8f688c05c35442fc620865Devang Patel // All break statements jump to NextBlock. If BreakContinueStack is non empty 1180e9b8c0a38549692f1b8f688c05c35442fc620865Devang Patel // then reuse last ContinueBlock. 1181f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall JumpDest OuterContinue; 1182e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson if (!BreakContinueStack.empty()) 1183f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall OuterContinue = BreakContinueStack.back().ContinueBlock; 1184e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson 1185f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall BreakContinueStack.push_back(BreakContinue(SwitchExit, OuterContinue)); 118651b09f2c528c8460b5465c676173324e44176d62Devang Patel 118751b09f2c528c8460b5465c676173324e44176d62Devang Patel // Emit switch body. 118851b09f2c528c8460b5465c676173324e44176d62Devang Patel EmitStmt(S.getBody()); 11891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1190e4b6d342c29d5cb9d311756100df1603810fa892Anders Carlsson BreakContinueStack.pop_back(); 119151b09f2c528c8460b5465c676173324e44176d62Devang Patel 119216f23570999cac1fa13597386938450843003840Daniel Dunbar // Update the default block in case explicit case range tests have 119316f23570999cac1fa13597386938450843003840Daniel Dunbar // been chained on top. 119416f23570999cac1fa13597386938450843003840Daniel Dunbar SwitchInsn->setSuccessor(0, CaseRangeBlock); 11951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1196f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If a default was never emitted: 119716f23570999cac1fa13597386938450843003840Daniel Dunbar if (!DefaultBlock->getParent()) { 1198f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // If we have cleanups, emit the default block so that there's a 1199f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // place to jump through the cleanups from. 1200f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall if (ConditionScope.requiresCleanups()) { 1201f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall EmitBlock(DefaultBlock); 1202f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall 1203f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall // Otherwise, just forward the default block to the switch end. 1204f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } else { 1205ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall DefaultBlock->replaceAllUsesWith(SwitchExit.getBlock()); 1206f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall delete DefaultBlock; 1207f1549f66a8216a78112286e3978cea2c29d6334cJohn McCall } 120816f23570999cac1fa13597386938450843003840Daniel Dunbar } 120916f23570999cac1fa13597386938450843003840Daniel Dunbar 1210ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall ConditionScope.ForceCleanup(); 1211ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall 121216f23570999cac1fa13597386938450843003840Daniel Dunbar // Emit continuation. 1213ff8e11579fc904aa4032d90d2be6ce1ac5fc9fe1John McCall EmitBlock(SwitchExit.getBlock(), true); 121451b09f2c528c8460b5465c676173324e44176d62Devang Patel 121551b09f2c528c8460b5465c676173324e44176d62Devang Patel SwitchInsn = SavedSwitchInsn; 1216c049e4f406a7f7179eba98659044a32508e53289Devang Patel CaseRangeBlock = SavedCRBlock; 121751b09f2c528c8460b5465c676173324e44176d62Devang Patel} 1218fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 12192819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattnerstatic std::string 1220444be7366d0a1e172c0290a1ea54c1cb16b5947cDaniel DunbarSimplifyConstraint(const char *Constraint, const TargetInfo &Target, 12212819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner llvm::SmallVectorImpl<TargetInfo::ConstraintInfo> *OutCons=0) { 1222fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::string Result; 12231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1224fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson while (*Constraint) { 1225fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson switch (*Constraint) { 1226fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson default: 12272f474ea9ef7505df5d092287c48c19974222293bJohn Thompson Result += Target.convertConstraint(*Constraint); 1228fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson break; 1229fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Ignore these 1230fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case '*': 1231fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case '?': 1232fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case '!': 1233ef44e1110711276ffffe4b22d4ba0cebd49cb330John Thompson case '=': // Will see this and the following in mult-alt constraints. 1234ef44e1110711276ffffe4b22d4ba0cebd49cb330John Thompson case '+': 1235ef44e1110711276ffffe4b22d4ba0cebd49cb330John Thompson break; 12362f474ea9ef7505df5d092287c48c19974222293bJohn Thompson case ',': 12372f474ea9ef7505df5d092287c48c19974222293bJohn Thompson Result += "|"; 1238fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson break; 1239fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson case 'g': 1240fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Result += "imr"; 1241fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson break; 1242300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson case '[': { 12432819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner assert(OutCons && 1244300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson "Must pass output names to constraints with a symbolic name"); 1245300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson unsigned Index; 12461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool result = Target.resolveSymbolicName(Constraint, 12472819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner &(*OutCons)[0], 12482819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner OutCons->size(), Index); 1249cbf40f913aa2aa5de6e0540fed209405d00a2c69Chris Lattner assert(result && "Could not resolve symbolic name"); (void)result; 1250300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson Result += llvm::utostr(Index); 1251300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson break; 1252300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson } 1253fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 12541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1255fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraint++; 1256fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 12571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1258fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson return Result; 1259fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson} 1260fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 126103117d1b2e32d18652401b12d9049871992bf3adRafael Espindola/// AddVariableConstraints - Look at AsmExpr and if it is a variable declared 126203117d1b2e32d18652401b12d9049871992bf3adRafael Espindola/// as using a particular register add that as a constraint that will be used 126303117d1b2e32d18652401b12d9049871992bf3adRafael Espindola/// in this asm stmt. 12640ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindolastatic std::string 126503117d1b2e32d18652401b12d9049871992bf3adRafael EspindolaAddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr, 126603117d1b2e32d18652401b12d9049871992bf3adRafael Espindola const TargetInfo &Target, CodeGenModule &CGM, 126703117d1b2e32d18652401b12d9049871992bf3adRafael Espindola const AsmStmt &Stmt) { 12680ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(&AsmExpr); 12690ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola if (!AsmDeclRef) 12700ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 12710ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola const ValueDecl &Value = *AsmDeclRef->getDecl(); 12720ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola const VarDecl *Variable = dyn_cast<VarDecl>(&Value); 12730ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola if (!Variable) 12740ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 12750ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola AsmLabelAttr *Attr = Variable->getAttr<AsmLabelAttr>(); 12760ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola if (!Attr) 12770ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 12780ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola llvm::StringRef Register = Attr->getLabel(); 1279baf86955a9a390f2643a1ea9806832eb4a92f716Rafael Espindola assert(Target.isValidGCCRegisterName(Register)); 128033a53440eb025dc511b7dcb27dea8029cc28b34fRafael Espindola // FIXME: We should check which registers are compatible with "r" or "x". 128133a53440eb025dc511b7dcb27dea8029cc28b34fRafael Espindola if (Constraint != "r" && Constraint != "x") { 12820ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola CGM.ErrorUnsupported(&Stmt, "__asm__"); 12830ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return Constraint; 12840ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola } 12850ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola return "{" + Register.str() + "}"; 12860ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola} 12870ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola 12886d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedmanllvm::Value* 12896d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli FriedmanCodeGenFunction::EmitAsmInputLValue(const AsmStmt &S, 12906d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman const TargetInfo::ConstraintInfo &Info, 12916d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman LValue InputValue, QualType InputType, 12926d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman std::string &ConstraintStr) { 1293634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson llvm::Value *Arg; 12941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (Info.allowsRegister() || !Info.allowsMemory()) { 12956d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman if (!CodeGenFunction::hasAggregateLLVMType(InputType)) { 12966d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = EmitLoadOfLValue(InputValue, InputType).getScalarVal(); 1297634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } else { 12986d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman const llvm::Type *Ty = ConvertType(InputType); 1299ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson uint64_t Size = CGM.getTargetData().getTypeSizeInBits(Ty); 1300ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson if (Size <= 64 && llvm::isPowerOf2_64(Size)) { 1301d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Ty = llvm::IntegerType::get(getLLVMContext(), Size); 1302ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson Ty = llvm::PointerType::getUnqual(Ty); 13031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13046d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = Builder.CreateLoad(Builder.CreateBitCast(InputValue.getAddress(), 13056d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Ty)); 1306ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson } else { 13076d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = InputValue.getAddress(); 1308ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson ConstraintStr += '*'; 1309ebaae2a3103b443d50444d335ab5ab0ff7680da2Anders Carlsson } 1310634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } 1311634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } else { 13126d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman Arg = InputValue.getAddress(); 1313634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson ConstraintStr += '*'; 1314634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson } 13151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1316634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson return Arg; 1317634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson} 1318634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson 13196d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedmanllvm::Value* CodeGenFunction::EmitAsmInput(const AsmStmt &S, 13206d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman const TargetInfo::ConstraintInfo &Info, 13216d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman const Expr *InputExpr, 13226d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman std::string &ConstraintStr) { 13236d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman if (Info.allowsRegister() || !Info.allowsMemory()) 13246d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman if (!CodeGenFunction::hasAggregateLLVMType(InputExpr->getType())) 13256d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman return EmitScalarExpr(InputExpr); 13266d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman 13276d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman InputExpr = InputExpr->IgnoreParenNoopCasts(getContext()); 13286d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman LValue Dest = EmitLValue(InputExpr); 13296d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman return EmitAsmInputLValue(S, Info, Dest, InputExpr->getType(), ConstraintStr); 13306d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman} 13316d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman 133247fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner/// getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline 13335d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner/// asm call instruction. The !srcloc MDNode contains a list of constant 13345d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner/// integers which are the source locations of the start of each line in the 13355d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner/// asm. 133647fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattnerstatic llvm::MDNode *getAsmSrcLocInfo(const StringLiteral *Str, 133747fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner CodeGenFunction &CGF) { 13385d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner llvm::SmallVector<llvm::Value *, 8> Locs; 13395d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner // Add the location of the first line to the MDNode. 13405d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner Locs.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 13415d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner Str->getLocStart().getRawEncoding())); 13425d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner llvm::StringRef StrVal = Str->getString(); 13435d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner if (!StrVal.empty()) { 13445d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner const SourceManager &SM = CGF.CGM.getContext().getSourceManager(); 13455d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner const LangOptions &LangOpts = CGF.CGM.getLangOptions(); 13465d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner 13475d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner // Add the location of the start of each subsequent line of the asm to the 13485d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner // MDNode. 13495d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner for (unsigned i = 0, e = StrVal.size()-1; i != e; ++i) { 13505d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner if (StrVal[i] != '\n') continue; 13515d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner SourceLocation LineLoc = Str->getLocationOfByte(i+1, SM, LangOpts, 13525d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner CGF.Target); 13535d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner Locs.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 13545d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner LineLoc.getRawEncoding())); 13555d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner } 13565d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner } 13575d93653247eeedaff5f0712178953b63d71a0b3bChris Lattner 13586f141659cab11109d9931d92d0988f8850778de3Jay Foad return llvm::MDNode::get(CGF.getLLVMContext(), Locs); 135947fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner} 136047fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner 1361fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlssonvoid CodeGenFunction::EmitAsmStmt(const AsmStmt &S) { 1362458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner // Analyze the asm string to decompose it into its pieces. We know that Sema 1363458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner // has already done this, so it is guaranteed to be successful. 1364458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner llvm::SmallVector<AsmStmt::AsmStringPiece, 4> Pieces; 1365fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner unsigned DiagOffs; 1366fb5058ef67c054296c88db18ab1b3717845cb71dChris Lattner S.AnalyzeAsmString(Pieces, getContext(), DiagOffs); 13671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1368458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner // Assemble the pieces into the final asm string. 1369458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner std::string AsmString; 1370458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner for (unsigned i = 0, e = Pieces.size(); i != e; ++i) { 1371458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner if (Pieces[i].isString()) 1372458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner AsmString += Pieces[i].getString(); 1373458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner else if (Pieces[i].getModifier() == '\0') 1374458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner AsmString += '$' + llvm::utostr(Pieces[i].getOperandNo()); 1375458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner else 1376458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner AsmString += "${" + llvm::utostr(Pieces[i].getOperandNo()) + ':' + 1377458cd9c8a79b25b87dcea43c9d97a4c59f194799Chris Lattner Pieces[i].getModifier() + '}'; 1378281f55c8c6aed79f1ac1c6ee848bd94ebd7f936fDaniel Dunbar } 13791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1380481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner // Get all the output and input constraints together. 1381481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; 1382481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner llvm::SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; 1383481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner 13841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0, e = S.getNumOutputs(); i != e; i++) { 1385481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo Info(S.getOutputConstraint(i), 1386481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner S.getOutputName(i)); 1387b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner bool IsValid = Target.validateOutputConstraint(Info); (void)IsValid; 1388b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner assert(IsValid && "Failed to parse output constraint"); 1389481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner OutputConstraintInfos.push_back(Info); 13901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 13911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1392481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner for (unsigned i = 0, e = S.getNumInputs(); i != e; i++) { 1393481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo Info(S.getInputConstraint(i), 1394481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner S.getInputName(i)); 1395b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner bool IsValid = Target.validateInputConstraint(OutputConstraintInfos.data(), 1396b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner S.getNumOutputs(), Info); 1397b992259f7790d3fb9fc5c2eb7182d7af9d64f9acChris Lattner assert(IsValid && "Failed to parse input constraint"); (void)IsValid; 1398481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner InputConstraintInfos.push_back(Info); 1399481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner } 14001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1401fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::string Constraints; 14021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1403ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner std::vector<LValue> ResultRegDests; 1404ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner std::vector<QualType> ResultRegQualTys; 1405a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner std::vector<const llvm::Type *> ResultRegTypes; 1406a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner std::vector<const llvm::Type *> ResultTruncRegTypes; 1407fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::vector<const llvm::Type*> ArgTypes; 1408fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson std::vector<llvm::Value*> Args; 1409f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson 1410f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson // Keep track of inout constraints. 1411f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson std::string InOutConstraints; 1412f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson std::vector<llvm::Value*> InOutArgs; 1413f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson std::vector<const llvm::Type*> InOutArgTypes; 141403eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 14151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (unsigned i = 0, e = S.getNumOutputs(); i != e; i++) { 1416481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i]; 141703eb543cf7ebee463b33b5802b83ac92c21770cfAnders Carlsson 1418fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Simplify the output constraint. 1419481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner std::string OutputConstraint(S.getOutputConstraint(i)); 1420a5694b8b0096215137bf1c273764ec93ac4898fdLauro Ramos Venancio OutputConstraint = SimplifyConstraint(OutputConstraint.c_str() + 1, Target); 14211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1422810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner const Expr *OutExpr = S.getOutputExpr(i); 1423810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner OutExpr = OutExpr->IgnoreParenNoopCasts(getContext()); 14241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 142503117d1b2e32d18652401b12d9049871992bf3adRafael Espindola OutputConstraint = AddVariableConstraints(OutputConstraint, *OutExpr, Target, 14260ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola CGM, S); 14270ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola 1428810f6d5d6223adaab0ccf0139f40de6484ad1bb5Chris Lattner LValue Dest = EmitLValue(OutExpr); 1429ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner if (!Constraints.empty()) 1430bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson Constraints += ','; 1431bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson 1432a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // If this is a register output, then make the inline asm return it 1433a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // by-value. If this is a memory result, return the value by-reference. 1434ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner if (!Info.allowsMemory() && !hasAggregateLLVMType(OutExpr->getType())) { 1435a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner Constraints += "=" + OutputConstraint; 1436ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner ResultRegQualTys.push_back(OutExpr->getType()); 1437ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner ResultRegDests.push_back(Dest); 1438a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultRegTypes.push_back(ConvertTypeForMem(OutExpr->getType())); 1439a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultTruncRegTypes.push_back(ResultRegTypes.back()); 14401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1441a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // If this output is tied to an input, and if the input is larger, then 1442a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // we need to set the actual result type of the inline asm node to be the 1443a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // same as the input type. 1444a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (Info.hasMatchingInput()) { 1445ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner unsigned InputNo; 1446ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner for (InputNo = 0; InputNo != S.getNumInputs(); ++InputNo) { 1447ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner TargetInfo::ConstraintInfo &Input = InputConstraintInfos[InputNo]; 1448aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (Input.hasTiedOperand() && Input.getTiedOperand() == i) 1449a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner break; 1450ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner } 1451ebfc9857de58a326c84629915d9ffe3f36d8cc26Chris Lattner assert(InputNo != S.getNumInputs() && "Didn't find matching input!"); 14521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1453a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner QualType InputTy = S.getInputExpr(InputNo)->getType(); 1454aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner QualType OutputType = OutExpr->getType(); 14551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1456a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner uint64_t InputSize = getContext().getTypeSize(InputTy); 1457aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (getContext().getTypeSize(OutputType) < InputSize) { 1458aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Form the asm to return the value as a larger integer or fp type. 1459aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner ResultRegTypes.back() = ConvertType(InputTy); 1460a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1461a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1462f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen if (const llvm::Type* AdjTy = 14634b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne getTargetHooks().adjustInlineAsmType(*this, OutputConstraint, 14644b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne ResultRegTypes.back())) 1465f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen ResultRegTypes.back() = AdjTy; 1466fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } else { 1467fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson ArgTypes.push_back(Dest.getAddress()->getType()); 1468cad3ab611ebd3bee3ce6395d649640047f904cdeAnders Carlsson Args.push_back(Dest.getAddress()); 1469f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson Constraints += "=*"; 1470fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += OutputConstraint; 1471f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson } 14721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 147344def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.isReadWrite()) { 1474f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson InOutConstraints += ','; 1475634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson 1476fca9361839ecc53224c764517e62fc0e15166004Anders Carlsson const Expr *InputExpr = S.getOutputExpr(i); 14776d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman llvm::Value *Arg = EmitAsmInputLValue(S, Info, Dest, InputExpr->getType(), 14786d7cfd7ef82e42ff30ee1dafd2883fd94e9f8294Eli Friedman InOutConstraints); 14791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 148044def070435a2b5d67f0534f7a3a85a7389d60f2Chris Lattner if (Info.allowsRegister()) 14819f2505b934745b18d580ade4dac7b8b16952a30cAnders Carlsson InOutConstraints += llvm::utostr(i); 14829f2505b934745b18d580ade4dac7b8b16952a30cAnders Carlsson else 14839f2505b934745b18d580ade4dac7b8b16952a30cAnders Carlsson InOutConstraints += OutputConstraint; 14842763b3af0a527c3a63cb058b90c22db0b7bcf558Anders Carlsson 1485fca9361839ecc53224c764517e62fc0e15166004Anders Carlsson InOutArgTypes.push_back(Arg->getType()); 1486fca9361839ecc53224c764517e62fc0e15166004Anders Carlsson InOutArgs.push_back(Arg); 1487f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson } 1488fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 14891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1490fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson unsigned NumConstraints = S.getNumOutputs() + S.getNumInputs(); 14911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1492fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson for (unsigned i = 0, e = S.getNumInputs(); i != e; i++) { 1493fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson const Expr *InputExpr = S.getInputExpr(i); 1494fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 1495481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; 1496481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner 1497ede9d900809c4fd0298d52f5a63088ecb8302275Chris Lattner if (!Constraints.empty()) 1498fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += ','; 14991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1500fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Simplify the input constraint. 1501481fef9e25128fe87b19e41c48f771ee20c33cbeChris Lattner std::string InputConstraint(S.getInputConstraint(i)); 1502300fb5d0ef7edc87f3fdba17fc8b1184013b35aeAnders Carlsson InputConstraint = SimplifyConstraint(InputConstraint.c_str(), Target, 15032819fa85651526d59ade4fdc9da2cadd7b132973Chris Lattner &OutputConstraintInfos); 1504fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 15050ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola InputConstraint = 150603117d1b2e32d18652401b12d9049871992bf3adRafael Espindola AddVariableConstraints(InputConstraint, 15070ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola *InputExpr->IgnoreParenNoopCasts(getContext()), 15080ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola Target, CGM, S); 15090ec89f928ce5b3294c2ed644ec1a42656e1af39dRafael Espindola 1510634717238844cf3f51039411be1b27fe1fac622eAnders Carlsson llvm::Value *Arg = EmitAsmInput(S, Info, InputExpr, Constraints); 15111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15124df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // If this input argument is tied to a larger output result, extend the 15134df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // input to be the same size as the output. The LLVM backend wants to see 15144df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // the input and output of a matching constraint be the same size. Note 15154df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // that GCC does not define what the top bits are here. We use zext because 15164df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // that is usually cheaper, but LLVM IR should really get an anyext someday. 15174df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner if (Info.hasTiedOperand()) { 15184df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner unsigned Output = Info.getTiedOperand(); 1519aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner QualType OutputType = S.getOutputExpr(Output)->getType(); 15204df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner QualType InputTy = InputExpr->getType(); 15211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1522aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (getContext().getTypeSize(OutputType) > 15234df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner getContext().getTypeSize(InputTy)) { 15244df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner // Use ptrtoint as appropriate so that we can do our extension. 15254df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner if (isa<llvm::PointerType>(Arg->getType())) 152677b89b87c3b9220fea1bc80f6d6598d2003cc8a8Chris Lattner Arg = Builder.CreatePtrToInt(Arg, IntPtrTy); 1527aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner const llvm::Type *OutputTy = ConvertType(OutputType); 1528aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (isa<llvm::IntegerType>(OutputTy)) 1529aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner Arg = Builder.CreateZExt(Arg, OutputTy); 1530aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner else 1531aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner Arg = Builder.CreateFPExt(Arg, OutputTy); 15324df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner } 15334df4ee0ff6f804e9d3dd478712e3b5b20cd3bf2fChris Lattner } 1534f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen if (const llvm::Type* AdjTy = 15354b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne getTargetHooks().adjustInlineAsmType(*this, InputConstraint, 15364b93d660c6326ec79b5e369317d1051cf826c2f3Peter Collingbourne Arg->getType())) 1537f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen Arg = Builder.CreateBitCast(Arg, AdjTy); 15381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1539fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson ArgTypes.push_back(Arg->getType()); 1540fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Args.push_back(Arg); 1541fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += InputConstraint; 1542fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 15431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1544f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson // Append the "input" part of inout constraints last. 1545f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson for (unsigned i = 0, e = InOutArgs.size(); i != e; i++) { 1546f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson ArgTypes.push_back(InOutArgTypes[i]); 1547f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson Args.push_back(InOutArgs[i]); 1548f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson } 1549f39a4211bdea6c136562a5225e5a84d54e62dc8fAnders Carlsson Constraints += InOutConstraints; 15501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1551fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Clobbers 1552fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson for (unsigned i = 0, e = S.getNumClobbers(); i != e; i++) { 155383c021c6d33aa173cf1a6e3bc61006dabb042703Anders Carlsson llvm::StringRef Clobber = S.getClobber(i)->getString(); 1554fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson 155583c021c6d33aa173cf1a6e3bc61006dabb042703Anders Carlsson Clobber = Target.getNormalizedGCCRegisterName(Clobber); 15561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1557ea041758d49215167e473a515b8d46e77b170ccfAnders Carlsson if (i != 0 || NumConstraints != 0) 1558fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += ','; 15591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1560ea041758d49215167e473a515b8d46e77b170ccfAnders Carlsson Constraints += "~{"; 1561fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += Clobber; 1562ea041758d49215167e473a515b8d46e77b170ccfAnders Carlsson Constraints += '}'; 1563fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 15641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1565fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson // Add machine specific clobbers 1566ccf614c479ac93326a01e7b373b30759eed7807fEli Friedman std::string MachineClobbers = Target.getClobbers(); 1567ccf614c479ac93326a01e7b373b30759eed7807fEli Friedman if (!MachineClobbers.empty()) { 1568fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson if (!Constraints.empty()) 1569fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson Constraints += ','; 1570ccf614c479ac93326a01e7b373b30759eed7807fEli Friedman Constraints += MachineClobbers; 1571fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson } 1572bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson 1573bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson const llvm::Type *ResultType; 1574a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (ResultRegTypes.empty()) 1575d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall ResultType = llvm::Type::getVoidTy(getLLVMContext()); 1576a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner else if (ResultRegTypes.size() == 1) 1577a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultType = ResultRegTypes[0]; 1578bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson else 1579d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall ResultType = llvm::StructType::get(getLLVMContext(), ResultRegTypes); 15801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const llvm::FunctionType *FTy = 1582fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson llvm::FunctionType::get(ResultType, ArgTypes, false); 15831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::InlineAsm *IA = 15851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump llvm::InlineAsm::get(FTy, AsmString, Constraints, 1586fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson S.isVolatile() || S.getNumOutputs() == 0); 1587bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson llvm::CallInst *Result = Builder.CreateCall(IA, Args.begin(), Args.end()); 1588bc0822bad87ac4d2dcac8e1b71960301656a2699Anders Carlsson Result->addAttribute(~0, llvm::Attribute::NoUnwind); 15891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1590fc1a9c312d249a2c7458f763f848ba42685c23f8Chris Lattner // Slap the source location of the inline asm into a !srcloc metadata on the 1591fc1a9c312d249a2c7458f763f848ba42685c23f8Chris Lattner // call. 159247fc7e93b6af9e6a967231133a2f4bc626eeed26Chris Lattner Result->setMetadata("srcloc", getAsmSrcLocInfo(S.getAsmString(), *this)); 15931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1594a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // Extract all of the register value results from the asm. 1595a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner std::vector<llvm::Value*> RegResults; 1596a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (ResultRegTypes.size() == 1) { 1597a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner RegResults.push_back(Result); 1598bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson } else { 1599a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner for (unsigned i = 0, e = ResultRegTypes.size(); i != e; ++i) { 1600bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson llvm::Value *Tmp = Builder.CreateExtractValue(Result, i, "asmresult"); 1601a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner RegResults.push_back(Tmp); 1602a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1603a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 16041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1605a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner for (unsigned i = 0, e = RegResults.size(); i != e; ++i) { 1606a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner llvm::Value *Tmp = RegResults[i]; 16071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1608a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // If the result type of the LLVM IR asm doesn't match the result type of 1609a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner // the expression, do the conversion. 1610a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner if (ResultRegTypes[i] != ResultTruncRegTypes[i]) { 1611a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner const llvm::Type *TruncTy = ResultTruncRegTypes[i]; 1612aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner 1613aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // Truncate the integer result to the right size, note that TruncTy can be 1614aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner // a pointer. 1615aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner if (TruncTy->isFloatingPointTy()) 1616aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner Tmp = Builder.CreateFPTrunc(Tmp, TruncTy); 16172dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman else if (TruncTy->isPointerTy() && Tmp->getType()->isIntegerTy()) { 1618aab64d0b7f41ed30b15ba9210ed859424cbc7455Chris Lattner uint64_t ResSize = CGM.getTargetData().getTypeSizeInBits(TruncTy); 1619d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Tmp = Builder.CreateTrunc(Tmp, 1620d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::IntegerType::get(getLLVMContext(), (unsigned)ResSize)); 1621a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner Tmp = Builder.CreateIntToPtr(Tmp, TruncTy); 16222dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman } else if (Tmp->getType()->isPointerTy() && TruncTy->isIntegerTy()) { 16232dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman uint64_t TmpSize =CGM.getTargetData().getTypeSizeInBits(Tmp->getType()); 1624d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall Tmp = Builder.CreatePtrToInt(Tmp, 1625d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::IntegerType::get(getLLVMContext(), (unsigned)TmpSize)); 16262dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman Tmp = Builder.CreateTrunc(Tmp, TruncTy); 16272dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman } else if (TruncTy->isIntegerTy()) { 16282dca88fc6d3e606a8131712be1800e3a4b90ca3eDan Gohman Tmp = Builder.CreateTrunc(Tmp, TruncTy); 1629f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen } else if (TruncTy->isVectorTy()) { 1630f6e2c2039f76fa58799f6d155892d54fc95755e1Dale Johannesen Tmp = Builder.CreateBitCast(Tmp, TruncTy); 1631a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner } 1632bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson } 16331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1634a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner EmitStoreThroughLValue(RValue::get(Tmp), ResultRegDests[i], 1635a077b5c8631596f8d7a588933a9de5d08e9ba428Chris Lattner ResultRegQualTys[i]); 1636bad3a94d506874355fc15b336c6f0ed360e46a06Anders Carlsson } 1637fb1aeb804c08d5288a923fb278161783e6abdc66Anders Carlsson} 1638