AsmPrinter.cpp revision a408333857f9fc404c69a4954590c348caef9e0d
193fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===// 293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev// 393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev// The LLVM Compiler Infrastructure 46d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// 56d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// This file is distributed under the University of Illinois Open Source 66d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// License. See LICENSE.TXT for details. 76d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// 86d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan//===----------------------------------------------------------------------===// 96d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// 106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// This file implements the AsmPrinter class. 116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan// 126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan//===----------------------------------------------------------------------===// 136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#define DEBUG_TYPE "asm-printer" 156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/AsmPrinter.h" 166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "DwarfDebug.h" 176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "DwarfException.h" 186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Module.h" 196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/GCMetadataPrinter.h" 206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/MachineConstantPool.h" 216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/MachineFrameInfo.h" 226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/MachineFunction.h" 236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/MachineJumpTableInfo.h" 246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/MachineLoopInfo.h" 256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/CodeGen/MachineModuleInfo.h" 266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Analysis/ConstantFolding.h" 276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Analysis/DebugInfo.h" 286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCAsmInfo.h" 296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCContext.h" 306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCExpr.h" 316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCInst.h" 326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCSection.h" 336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCStreamer.h" 346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/MC/MCSymbol.h" 356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Target/Mangler.h" 366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Target/TargetData.h" 376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Target/TargetInstrInfo.h" 38c427f5e8ab231012d7663a0ee408f1225bac971azhanyong.wan#include "llvm/Target/TargetLowering.h" 39c427f5e8ab231012d7663a0ee408f1225bac971azhanyong.wan#include "llvm/Target/TargetLoweringObjectFile.h" 406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/Target/TargetRegisterInfo.h" 416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/ADT/SmallString.h" 426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan#include "llvm/ADT/Statistic.h" 43535de5338c3a76bc75905694ac15731e3f0bfc8dzhanyong.wan#include "llvm/Support/ErrorHandling.h" 44535de5338c3a76bc75905694ac15731e3f0bfc8dzhanyong.wan#include "llvm/Support/Format.h" 45535de5338c3a76bc75905694ac15731e3f0bfc8dzhanyong.wan#include "llvm/Support/Timer.h" 46535de5338c3a76bc75905694ac15731e3f0bfc8dzhanyong.wanusing namespace llvm; 47673a0cb9079f8f37bd61588a3160e12daf70ec44vladlosev 48673a0cb9079f8f37bd61588a3160e12daf70ec44vladlosevstatic const char *DWARFGroupName = "DWARF Emission"; 49733a54a398766289b74cf3daebe083d7115cf388zhanyong.wanstatic const char *DbgTimerName = "DWARF Debug Writer"; 509644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wanstatic const char *EHTimerName = "DWARF Exception Writer"; 51733a54a398766289b74cf3daebe083d7115cf388zhanyong.wan 529644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wanSTATISTIC(EmittedInsts, "Number of machine instrs printed"); 539644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 549644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wanchar AsmPrinter::ID = 0; 559644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 56357070773163979334f922aea127388de17c26fakosak@google.comtypedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type; 57357070773163979334f922aea127388de17c26fakosak@google.comstatic gcp_map_type &getGCMap(void *&P) { 58357070773163979334f922aea127388de17c26fakosak@google.com if (P == 0) 59357070773163979334f922aea127388de17c26fakosak@google.com P = new gcp_map_type(); 60357070773163979334f922aea127388de17c26fakosak@google.com return *(gcp_map_type*)P; 61357070773163979334f922aea127388de17c26fakosak@google.com} 62357070773163979334f922aea127388de17c26fakosak@google.com 63357070773163979334f922aea127388de17c26fakosak@google.com 646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanAsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer) 656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan : MachineFunctionPass(&ID), 669644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan TM(tm), MAI(tm.getMCAsmInfo()), 679644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan OutContext(Streamer.getContext()), 689644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan OutStreamer(Streamer), 699644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) { 709644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan DD = 0; DE = 0; MMI = 0; LI = 0; 719644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan GCMetadataPrinters = 0; 729644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan VerboseAsm = Streamer.isVerboseAsm(); 739644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan} 749644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 759644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wanAsmPrinter::~AsmPrinter() { 769644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized"); 779644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 789644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan if (GCMetadataPrinters != 0) { 799644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan gcp_map_type &GCMap = getGCMap(GCMetadataPrinters); 809644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 819644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I) 826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan delete I->second; 839644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan delete &GCMap; 846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan GCMetadataPrinters = 0; 856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan delete &OutStreamer; 886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// getFunctionNumber - Return a unique ID for the current function. 916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// 926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanunsigned AsmPrinter::getFunctionNumber() const { 936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return MF->getFunctionNumber(); 946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanconst TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const { 976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return TM.getTargetLowering()->getObjFileLowering(); 986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// getTargetData - Return information about data layout. 1026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanconst TargetData &AsmPrinter::getTargetData() const { 1036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return *TM.getTargetData(); 1046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 1056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// getCurrentSection() - Return the current section we are emitting to. 1076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanconst MCSection *AsmPrinter::getCurrentSection() const { 1086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return OutStreamer.getCurrentSection(); 1096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 1106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 1146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AU.setPreservesAll(); 1156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MachineFunctionPass::getAnalysisUsage(AU); 1166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AU.addRequired<MachineModuleInfo>(); 1176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AU.addRequired<GCModuleInfo>(); 1186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) 1196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AU.addRequired<MachineLoopInfo>(); 1206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 1216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanbool AsmPrinter::doInitialization(Module &M) { 1236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 1246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMI->AnalyzeModule(M); 1256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Initialize TargetLoweringObjectFile. 1276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const_cast<TargetLoweringObjectFile&>(getObjFileLowering()) 1286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan .Initialize(OutContext, TM); 1296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Mang = new Mangler(OutContext, *TM.getTargetData()); 1316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Allow the target to emit any magic that it wants at the start of the file. 1336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitStartOfAsmFile(M); 1346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Very minimal debug info. It is ignored if we emit actual debug info. If we 1366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // don't, this at least helps the user find where a global came from. 1376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasSingleParameterDotFile()) { 1386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .file "foo.c" 1396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitFileDirective(M.getModuleIdentifier()); 1406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 1416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 1436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 1446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 1456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 1466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MP->beginAssembly(*this); 1476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit module-level inline asm if it exists. 1496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!M.getModuleInlineAsm().empty()) { 1506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.AddComment("Start of file scope inline assembly"); 1516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.AddBlankLine(); 1526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitInlineAsm(M.getModuleInlineAsm(), 0/*no loc cookie*/); 15345577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev OutStreamer.AddComment("End of file scope inline assembly"); 15493fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev OutStreamer.AddBlankLine(); 15593fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev } 1566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 1576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->doesSupportDebugInformation()) 15845577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev DD = new DwarfDebug(this, &M); 15993fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev 16093fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev if (MAI->doesSupportExceptionHandling()) 1616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE = new DwarfException(this); 1626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 16345577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev return false; 16493fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev} 16593fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev 1666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const { 1676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan switch ((GlobalValue::LinkageTypes)Linkage) { 16845577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev case GlobalValue::CommonLinkage: 16993fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev case GlobalValue::LinkOnceAnyLinkage: 17093fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev case GlobalValue::LinkOnceODRLinkage: 1716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case GlobalValue::WeakAnyLinkage: 1726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case GlobalValue::WeakODRLinkage: 17345577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev case GlobalValue::LinkerPrivateLinkage: 17493fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev if (MAI->getWeakDefDirective() != 0) { 17593fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // .globl _foo 1766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 1776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .weak_definition _foo 17845577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition); 17993fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) { 18093fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // .globl _foo 1816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 1826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: linkonce should be a section attribute, handled by COFF Section 18345577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev // assignment. 18493fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce 18593fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // .linkonce discard 1866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: It would be nice to use .linkonce samesize for non-common 1876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // globals. 18845577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev OutStreamer.EmitRawText(StringRef(LinkOnce)); 18993fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev } else { 19093fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // .weak _foo 1916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak); 1926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 19345577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev break; 19493fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev case GlobalValue::DLLExportLinkage: 19593fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev case GlobalValue::AppendingLinkage: 1966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: appending linkage variables should go into a section of 1976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // their name or something. For now, just emit them as external. 19845577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev case GlobalValue::ExternalLinkage: 19993fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // If external or appending, declare as a global symbol. 20093fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev // .globl _foo 2016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 2026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 2036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case GlobalValue::PrivateLinkage: 2046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case GlobalValue::InternalLinkage: 2056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 2066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan default: 2076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan llvm_unreachable("Unknown linkage type!"); 2086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 2096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 2106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitGlobalVariable - Emit the specified global variable to the .s file. 2136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 2146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!GV->hasInitializer()) // External globals require no code. 2156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 217fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev // Check to see if this is a special global used by LLVM, if so, emit it. 2186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (EmitSpecialLLVMGlobal(GV)) 2196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbol *GVSym = Mang->getSymbol(GV); 2226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitVisibility(GVSym, GV->getVisibility()); 2236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasDotTypeDotSizeDirective()) 2256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); 2266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 2286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const TargetData *TD = TM.getTargetData(); 2306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 2316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If the alignment is specified, we *must* obey it. Overaligning a global 2339644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan // with a specified alignment is a prompt way to break globals emitted to 2349644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan // sections and expected to be contiguous (e.g. ObjC metadata). 2356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned AlignLog; 2366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (unsigned GVAlign = GV->getAlignment()) 2376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AlignLog = Log2_32(GVAlign); 2386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan else 2396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AlignLog = TD->getPreferredAlignmentLog(GV); 2406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Handle common and BSS local symbols (.lcomm). 2426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GVKind.isCommon() || GVKind.isBSSLocal()) { 2436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 2446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) { 2466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan WriteAsOperand(OutStreamer.GetCommentOS(), GV, 2476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan /*PrintType=*/false, GV->getParent()); 2486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.GetCommentOS() << '\n'; 249fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev } 2506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Handle common symbols. 2526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GVKind.isCommon()) { 2536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .comm _foo, 42, 4 2546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 2556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 2576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Handle local BSS symbols. 2596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasMachoZeroFillDirective()) { 2606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCSection *TheSection = 2616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 2626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .zerofill __DATA, __bss, _foo, 400, 5 2636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 2646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 2666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasLCOMMDirective()) { 2686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .lcomm _foo, 42 2696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLocalCommonSymbol(GVSym, Size); 2706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 2726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .local _foo 2749644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local); 2759644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan // .comm _foo, 42, 4 2766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 2776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2786d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 2796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCSection *TheSection = 2816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 2826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2836d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Handle the zerofill directive on darwin, which is a special form of BSS 2846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // emission. 2856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) { 2866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .globl _foo 2876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 2886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .zerofill __DATA, __common, _foo, 400, 5 2896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 2906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 2916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 292fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev 2936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(TheSection); 2946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitLinkage(GV->getLinkage(), GVSym); 2966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitAlignment(AlignLog, GV); 2976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 2986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) { 2996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan WriteAsOperand(OutStreamer.GetCommentOS(), GV, 3006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan /*PrintType=*/false, GV->getParent()); 3016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.GetCommentOS() << '\n'; 3026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 3036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(GVSym); 3046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitGlobalConstant(GV->getInitializer()); 3066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasDotTypeDotSizeDirective()) 3086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .size foo, 42 3099644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext)); 3109644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 3116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.AddBlankLine(); 3126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 3136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitFunctionHeader - This method emits the header for the current 3156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// function. 3166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitFunctionHeader() { 3176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print out constants referenced by the function 3186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitConstantPool(); 3196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print the 'header' of function. 3216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const Function *F = MF->getFunction(); 3226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM)); 3246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitVisibility(CurrentFnSym, F->getVisibility()); 3256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitLinkage(F->getLinkage(), CurrentFnSym); 3276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitAlignment(MF->getAlignment(), F); 3286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 329fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev if (MAI->hasDotTypeDotSizeDirective()) 3306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction); 3316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) { 3336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan WriteAsOperand(OutStreamer.GetCommentOS(), F, 3346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan /*PrintType=*/false, F->getParent()); 3356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.GetCommentOS() << '\n'; 3366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 3376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit the CurrentFnSym. This is a virtual function to allow targets to 3396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // do their wild and crazy things as required. 3406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitFunctionEntryLabel(); 3416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If the function had address-taken blocks that got deleted, then we have 3436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // references to the dangling symbols. Emit them at the start of the function 3446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // so that we don't get references to undefined symbols. 3456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan std::vector<MCSymbol*> DeadBlockSyms; 3466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms); 3476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) { 3489644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan OutStreamer.AddComment("Address taken block that was later removed"); 3499644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan OutStreamer.EmitLabel(DeadBlockSyms[i]); 3506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 3516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Add some workaround for linkonce linkage on Cygwin\MinGW. 3536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->getLinkOnceDirective() != 0 && 3546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) { 3556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: What is this? 3566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbol *FakeStub = 3576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+ 3586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CurrentFnSym->getName()); 3596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(FakeStub); 3606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 3616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit pre-function debug and/or EH information. 3636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (DE) { 3646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 3656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(EHTimerName, DWARFGroupName); 3666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE->BeginFunction(MF); 3676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 3686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE->BeginFunction(MF); 3696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 370fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev } 3716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (DD) { 3726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 3736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(DbgTimerName, DWARFGroupName); 3746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->beginFunction(MF); 3756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 3766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->beginFunction(MF); 3776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 3786d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 3796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 3806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the 3826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// function. This can be overridden by targets as required to do custom stuff. 3836d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitFunctionEntryLabel() { 3846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(CurrentFnSym); 3856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 3866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitComments - Pretty-print comments for instructions. 3896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanstatic void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) { 3909644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan const MachineFunction *MF = MI.getParent()->getParent(); 3919644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan const TargetMachine &TM = MF->getTarget(); 3926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 3936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DebugLoc DL = MI.getDebugLoc(); 3946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!DL.isUnknown()) { // Print source line info. 3956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DIScope Scope(DL.getScope(MF->getFunction()->getContext())); 3966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Omit the directory, because it's likely to be long and uninteresting. 3976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (Scope.Verify()) 3986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << Scope.getFilename(); 3996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan else 4006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << "<unknown>"; 4016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << ':' << DL.getLine(); 4026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (DL.getCol() != 0) 4036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << ':' << DL.getCol(); 4046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << '\n'; 4056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Check for spills and reloads 4086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan int FI; 4096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MachineFrameInfo *FrameInfo = MF->getFrameInfo(); 4116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // We assume a single instruction only has a spill or reload, not 4136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // both. 414fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev const MachineMemOperand *MMO; 4156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 4166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (FrameInfo->isSpillSlotObjectIndex(FI)) { 4176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMO = *MI.memoperands_begin(); 4186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << MMO->getSize() << "-byte Reload\n"; 4196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 4216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (FrameInfo->isSpillSlotObjectIndex(FI)) 4226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << MMO->getSize() << "-byte Folded Reload\n"; 4236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 4246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (FrameInfo->isSpillSlotObjectIndex(FI)) { 4256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMO = *MI.memoperands_begin(); 4266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << MMO->getSize() << "-byte Spill\n"; 4276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 4296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (FrameInfo->isSpillSlotObjectIndex(FI)) 4306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << MMO->getSize() << "-byte Folded Spill\n"; 4316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Check for spill-induced copies 4346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 4359644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 4369644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan SrcSubIdx, DstSubIdx)) { 4376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse)) 4386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CommentOS << " Reload Reuse\n"; 4396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 4416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitImplicitDef - This method emits the specified machine instruction 4436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// that is an implicit def. 4446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanstatic void EmitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) { 4456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned RegNo = MI->getOperand(0).getReg(); 4466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AP.OutStreamer.AddComment(Twine("implicit-def: ") + 4476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AP.TM.getRegisterInfo()->getName(RegNo)); 4486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AP.OutStreamer.AddBlankLine(); 4496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 4506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanstatic void EmitKill(const MachineInstr *MI, AsmPrinter &AP) { 4526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan std::string Str = "kill:"; 4536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 4546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MachineOperand &Op = MI->getOperand(i); 4556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(Op.isReg() && "KILL instruction must have only register operands"); 4566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Str += ' '; 4576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Str += AP.TM.getRegisterInfo()->getName(Op.getReg()); 4586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Str += (Op.isDef() ? "<def>" : "<kill>"); 4596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AP.OutStreamer.AddComment(Str); 461fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev AP.OutStreamer.AddBlankLine(); 4626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 4636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitDebugValueComment - This method handles the target-independent form 4656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// of DBG_VALUE, returning true if it was able to do so. A false return 4666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// means the target will need to handle MI in EmitInstruction. 4676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanstatic bool EmitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) { 4686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // This code handles only the 3-operand target-independent form. 4696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MI->getNumOperands() != 3) 4706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return false; 4716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan SmallString<128> Str; 4736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan raw_svector_ostream OS(Str); 4746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: "; 4756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // cast away const; DIetc do not take const operands for some reason. 4776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata())); 4786d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << V.getName() << " <- "; 4796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 4806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Register or immediate value. Register 0 means undef. 4816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MI->getOperand(0).isFPImm()) { 4829644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF()); 4839644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) { 4846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << (double)APF.convertToFloat(); 4856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) { 4866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << APF.convertToDouble(); 4876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 4886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // There is no good way to print long double. Convert a copy to 4896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // double. Ah well, it's only a comment. 4906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan bool ignored; 4916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 4926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan &ignored); 4936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << "(long double) " << APF.convertToDouble(); 4946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 4956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else if (MI->getOperand(0).isImm()) { 4966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << MI->getOperand(0).getImm(); 4976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 4986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(MI->getOperand(0).isReg() && "Unknown operand type"); 4996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MI->getOperand(0).getReg() == 0) { 5006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Suppress offset, it is not meaningful here. 5016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << "undef"; 5026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // NOTE: Want this comment at start of line, don't emit with AddComment. 5036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AP.OutStreamer.EmitRawText(OS.str()); 5046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return true; 5056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg()); 5076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OS << '+' << MI->getOperand(1).getImm(); 510fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev // NOTE: Want this comment at start of line, don't emit with AddComment. 5116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan AP.OutStreamer.EmitRawText(OS.str()); 5126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return true; 5136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 5146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitFunctionBody - This method emits the body and trailer for a 5166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// function. 5176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitFunctionBody() { 5186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit target-specific gunk before the function body. 5196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitFunctionBodyStart(); 5206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo(); 5226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print out code for the function. 5246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan bool HasAnyRealCode = false; 5256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 5266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan I != E; ++I) { 5276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print a label for the basic block. 5286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitBasicBlockStart(I); 5296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 5306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan II != IE; ++II) { 5316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print the assembly for the instruction. 5329644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan if (!II->isLabel()) 5339644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan HasAnyRealCode = true; 5346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan ++EmittedInsts; 5366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (ShouldPrintDebugScopes) { 5386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 5396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(DbgTimerName, DWARFGroupName); 5406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->beginScope(II); 5416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 5426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->beginScope(II); 5436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) 5476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitComments(*II, OutStreamer.GetCommentOS()); 5486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan switch (II->getOpcode()) { 5506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::DBG_LABEL: 5516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::EH_LABEL: 5526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::GC_LABEL: 5536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol()); 5546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 5556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::INLINEASM: 5566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitInlineAsm(II); 5576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 5586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::DBG_VALUE: 5596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) { 5606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!EmitDebugValueComment(II, *this)) 5616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitInstruction(II); 562fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev } 5636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 5646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::IMPLICIT_DEF: 5656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) EmitImplicitDef(II, *this); 5666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 5676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case TargetOpcode::KILL: 5686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) EmitKill(II, *this); 5696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 5706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan default: 5716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitInstruction(II); 5726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 5736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (ShouldPrintDebugScopes) { 5766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 5776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(DbgTimerName, DWARFGroupName); 5786d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->endScope(II); 5796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 5806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->endScope(II); 5816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5836d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5849644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan } 5859644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 5866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If the function is empty and the object file uses .subsections_via_symbols, 5876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // then we need to emit *something* to the function body to prevent the 5886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // labels from collapsing together. Just emit a noop. 5896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) { 5906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCInst Noop; 5916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan TM.getInstrInfo()->getNoopForMachoTarget(Noop); 5926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (Noop.getOpcode()) 5936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitInstruction(Noop); 5946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan else // Target not mc-ized yet. 5956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitRawText(StringRef("\tnop\n")); 5966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 5976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 5986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit target-specific gunk after the function body. 5996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitFunctionBodyEnd(); 6006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If the target wants a .size directive for the size of the function, emit 6026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // it. 6036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasDotTypeDotSizeDirective()) { 6046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Create a symbol for the end of function, so we can get the size as 6056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // difference between the function label and the temp label. 6066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbol *FnEndLabel = OutContext.CreateTempSymbol(); 6076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(FnEndLabel); 6086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCExpr *SizeExp = 6106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext), 6116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbolRefExpr::Create(CurrentFnSym, OutContext), 6126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutContext); 6136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitELFSize(CurrentFnSym, SizeExp); 6146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 616fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev // Emit post-function debug information. 617fbd53a53c1e01dec71c65754cf73282e4759bc40vladlosev if (DD) { 6186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 6196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(DbgTimerName, DWARFGroupName); 6206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->endFunction(MF); 6216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 6226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->endFunction(MF); 6236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (DE) { 6266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 6276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(EHTimerName, DWARFGroupName); 6286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE->EndFunction(); 6296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 6306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE->EndFunction(); 6316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMI->EndFunction(); 6346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print out jump tables referenced by the function. 6366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitJumpTableInfo(); 6376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.AddBlankLine(); 6396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 6409644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 6419644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 6426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanbool AsmPrinter::doFinalization(Module &M) { 6436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit global variables. 6446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 6456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan I != E; ++I) 6466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitGlobalVariable(I); 6476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Finalize debug and EH information. 6496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (DE) { 6506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 6516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(EHTimerName, DWARFGroupName); 6526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE->EndModule(); 6536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 6546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DE->EndModule(); 6556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan delete DE; DE = 0; 6576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (DD) { 6596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TimePassesIsEnabled) { 6606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan NamedRegionTimer T(DbgTimerName, DWARFGroupName); 6616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->endModule(); 6626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 6636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan DD->endModule(); 6646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan delete DD; DD = 0; 6666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If the target wants to know about weak references, print them all. 6696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->getWeakRefDirective()) { 6706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: This is not lazy, it would be nice to only print weak references 6716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // to stuff that is actually used. Note that doing so would require targets 6726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // to notice uses in operands (due to constant exprs etc). This should 6736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // happen with the MC stuff eventually. 6746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Print out module-level global variables here. 6766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 6776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan I != E; ++I) { 6786d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!I->hasExternalWeakLinkage()) continue; 6796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference); 6806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 6836d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!I->hasExternalWeakLinkage()) continue; 6846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference); 6856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 6876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasSetDirective()) { 6896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.AddBlankLine(); 6906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 6916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan I != E; ++I) { 6926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbol *Name = Mang->getSymbol(I); 6936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 6956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbol *Target = Mang->getSymbol(GV); 6966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 6976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 6986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(Name, MCSA_Global); 6996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan else if (I->hasWeakLinkage()) 7006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference); 7016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan else 7026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(I->hasLocalLinkage() && "Invalid alias linkage"); 7036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitVisibility(Name, I->getVisibility()); 7056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit the directives as assignments aka .set: 7076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitAssignment(Name, 7086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbolRefExpr::Create(Target, OutContext)); 7096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 7106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 7116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 7136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 7146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 7156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 7166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MP->finishAssembly(*this); 7176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If we don't have any trampolines, then we don't require stack memory 7196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // to be executable. Some targets have a directive to declare this. 7206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 7216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 7226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext)) 7236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(S); 7246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Allow the target to emit any magic that it wants at the end of the file, 7266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // after everything else has gone out. 7276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitEndOfAsmFile(M); 7286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan delete Mang; Mang = 0; 7306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MMI = 0; 7316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.Finish(); 7336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return false; 7346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 7356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 7376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan this->MF = &MF; 7386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Get the function symbol. 7396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CurrentFnSym = Mang->getSymbol(MF.getFunction()); 7406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 74145577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev if (isVerbose()) 74293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev LI = &getAnalysis<MachineLoopInfo>(); 74393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev} 7446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wannamespace { 74645577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev // SectionCPs - Keep track the alignment, constpool entries per Section. 74793fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev struct SectionCPs { 74893fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev const MCSection *S; 7496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned Alignment; 7506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan SmallVector<unsigned, 4> CPEs; 75145577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 75293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev }; 75393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev} 7546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitConstantPool - Print to the current output stream assembly 75645577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev/// representations of the constants in the constant pool MCP. This is 75793fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev/// used to print out constants which have been "spilled to memory" by 75893fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev/// the code generator. 7596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// 7606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitConstantPool() { 76145577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev const MachineConstantPool *MCP = MF->getConstantPool(); 76293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 76393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev if (CP.empty()) return; 7646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Calculate sections for constant pool entries. We collect entries to go into 76645577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev // the same section together to reduce amount of section switch statements. 76793fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev SmallVector<SectionCPs, 4> CPSections; 76893fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev for (unsigned i = 0, e = CP.size(); i != e; ++i) { 7696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MachineConstantPoolEntry &CPE = CP[i]; 7706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned Align = CPE.getAlignment(); 77145577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev 77293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev SectionKind Kind; 77393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev switch (CPE.getRelocationInfo()) { 7746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan default: llvm_unreachable("Unknown section kind"); 7756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 77645577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev case 1: 77793fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev Kind = SectionKind::getReadOnlyWithRelLocal(); 77893fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev break; 7796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case 0: 7806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 78145577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev case 4: Kind = SectionKind::getMergeableConst4(); break; 78293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev case 8: Kind = SectionKind::getMergeableConst8(); break; 78393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev case 16: Kind = SectionKind::getMergeableConst16();break; 7846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan default: Kind = SectionKind::getMergeableConst(); break; 7856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 78645577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev } 78793fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev 78893fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 7896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 7906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // The number of sections are small, just do a linear search from the 79145577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev // last section to the first. 79293fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev bool Found = false; 79393fed47dbf8e6bc3d39d3f769cb5039551747257vladlosev unsigned SecIdx = CPSections.size(); 7946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan while (SecIdx != 0) { 7956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (CPSections[--SecIdx].S == S) { 7966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Found = true; 7976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 7986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 7996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!Found) { 8016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan SecIdx = CPSections.size(); 8026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CPSections.push_back(SectionCPs(S, Align)); 8036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (Align > CPSections[SecIdx].Alignment) 8066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CPSections[SecIdx].Alignment = Align; 8076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan CPSections[SecIdx].CPEs.push_back(i); 8086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Now print stuff into the calculated sections. 8116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 8126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(CPSections[i].S); 8136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitAlignment(Log2_32(CPSections[i].Alignment)); 8146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned Offset = 0; 8166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 8176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned CPI = CPSections[i].CPEs[j]; 8186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MachineConstantPoolEntry CPE = CP[CPI]; 8196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit inter-object padding for alignment. 8216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned AlignMask = CPE.getAlignment() - 1; 8226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 8236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/); 8246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const Type *Ty = CPE.getType(); 8266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 8276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Emit the label with a comment on it. 8296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (isVerbose()) { 8306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.GetCommentOS() << "constant pool "; 8316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(), 8326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MF->getFunction()->getParent()); 8336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.GetCommentOS() << '\n'; 8346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(GetCPISymbol(CPI)); 8366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (CPE.isMachineConstantPoolEntry()) 8386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 8396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan else 8406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitGlobalConstant(CPE.Val.ConstVal); 8416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 8446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitJumpTableInfo - Print assembly representations of the jump tables used 8466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// by the current function to the current output stream. 8476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// 8486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitJumpTableInfo() { 8496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo(); 8506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MJTI == 0) return; 8516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return; 8526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 8536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (JT.empty()) return; 8546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Pick the directive to use to print the jump table entries, and switch to 8566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // the appropriate section. 8576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const Function *F = MF->getFunction(); 8586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan bool JTInDiffSection = false; 8596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (// In PIC mode, we need to emit the jump table to the same section as the 8606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // function body itself, otherwise the label differences won't make sense. 8616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: Need a better predicate for this: what about custom entries? 8626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 || 8636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // We should also do if the section name is NULL or function is declared 8646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // in discardable section 8656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: this isn't the right predicate, should be based on the MCSection 8666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // for the function. 8676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan F->isWeakForLinker()) { 8686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM)); 8696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } else { 8706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Otherwise, drop it in the readonly section. 8716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCSection *ReadOnlySection = 8726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 8736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(ReadOnlySection); 8746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan JTInDiffSection = true; 8756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 8766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8776d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData()))); 8786d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) { 8806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 8816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If this jump table was deleted, ignore it. 8836d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (JTBBs.empty()) continue; 8846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // For the EK_LabelDifference32 entry, if the target supports .set, emit a 8866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .set directive for each unique entry. This reduces the number of 8876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // relocations the assembler will generate for the jump table. 8886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 && 8896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MAI->hasSetDirective()) { 8906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets; 8916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const TargetLowering *TLI = TM.getTargetLowering(); 8926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext); 8936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 8946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MachineBasicBlock *MBB = JTBBs[ii]; 8956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!EmittedSets.insert(MBB)) continue; 8966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 8976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .set LJTSet, LBB32-base 8986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCExpr *LHS = 8996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext); 9006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()), 9016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCBinaryExpr::CreateSub(LHS, Base, OutContext)); 9026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // On some targets (e.g. Darwin) we want to emit two consequtive labels 9066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // before each jump table. The first label is never referenced, but tells 9076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // the assembler and linker the extents of the jump table object. The 9086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // second label is actually referenced by the code. 9096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) 9106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // FIXME: This doesn't have to have any specific name, just any randomly 9116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // named and numbered 'l' label would work. Simplify GetJTISymbol. 9126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(GetJTISymbol(JTI, true)); 9136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitLabel(GetJTISymbol(JTI)); 9156d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 9176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitJumpTableEntry(MJTI, JTBBs[ii], JTI); 9186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan} 9206d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9216d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the 9226d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// current stream. 9236d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanvoid AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI, 9246d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MachineBasicBlock *MBB, 9256d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned UID) const { 9266d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCExpr *Value = 0; 9276d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan switch (MJTI->getEntryKind()) { 9286d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case MachineJumpTableInfo::EK_Inline: 9296d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan llvm_unreachable("Cannot emit EK_Inline jump table entry"); break; 9306d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case MachineJumpTableInfo::EK_Custom32: 9316d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID, 9326d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutContext); 9336d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 9346d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case MachineJumpTableInfo::EK_BlockAddress: 9356d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // EK_BlockAddress - Each entry is a plain address of block, e.g.: 9366d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .word LBB123 9376d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext); 9386d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 9396d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case MachineJumpTableInfo::EK_GPRel32BlockAddress: { 9406d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // EK_GPRel32BlockAddress - Each entry is an address of block, encoded 9416d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // with a relocation as gp-relative, e.g.: 9426d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .gprel32 LBB123 9436d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSymbol *MBBSym = MBB->getSymbol(); 9446d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext)); 9456d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return; 9466d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9476d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9486d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan case MachineJumpTableInfo::EK_LabelDifference32: { 9496d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // EK_LabelDifference32 - Each entry is the address of the block minus 9506d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // the address of the jump table. This is used for PIC jump tables where 9516d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // gprel32 is not supported. e.g.: 9526d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .word LBB123 - LJTI1_2 9536d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If the .set directive is supported, this is emitted as: 9546d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .set L4_5_set_123, LBB123 - LJTI1_2 9556d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // .word L4_5_set_123 9566d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9576d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If we have emitted set directives for the jump table entries, print 9586d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // them rather than the entries themselves. If we're emitting PIC, then 9596d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // emit the table entries as differences between two text section labels. 9606d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasSetDirective()) { 9616d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // If we used .set, reference the .set's symbol. 9626d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()), 9636d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutContext); 9646d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 9656d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9666d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Otherwise, use the difference as the jump table entry. 9676d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext); 9686d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext); 9696d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext); 9706d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan break; 9716d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9726d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9736d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9746d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(Value && "Unknown entry kind!"); 9756d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9766d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData()); 97745577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0); 97845577eac2c9317f5a8adfe7a9d37f62f45832b96vladlosev} 9796d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9806d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9816d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 9826d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// special global used by LLVM. If so, emit it and return true, otherwise 9836d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan/// do nothing and return false. 9846d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wanbool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 9856d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GV->getName() == "llvm.used") { 9866d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (MAI->hasNoDeadStrip()) // No need to emit this at all. 9876d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitLLVMUsedList(GV->getInitializer()); 9886d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return true; 9896d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 9906d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9916d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan // Ignore debug and non-emitted data. This handles llvm.compiler.used. 9926d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GV->getSection() == "llvm.metadata" || 9936d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan GV->hasAvailableExternallyLinkage()) 9946d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return true; 9956d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9966d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (!GV->hasAppendingLinkage()) return false; 9976d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 9986d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan assert(GV->hasInitializer() && "Not a special LLVM global!"); 9996d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 10006d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan const TargetData *TD = TM.getTargetData(); 10016d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 10026d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GV->getName() == "llvm.global_ctors") { 10036d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection()); 10046d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitAlignment(Align, 0); 10056d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitXXStructorList(GV->getInitializer()); 10066d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan 10076d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (TM.getRelocationModel() == Reloc::Static && 10086d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MAI->hasStaticCtorDtorReferenceInStaticMode()) { 10096d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan StringRef Sym(".constructors_used"); 10106d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 10116d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan MCSA_Reference); 10126d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 10136d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan return true; 10146d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan } 10159644db857432db95bc64f5d6db5867b1c7cf1679zhanyong.wan 10166d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan if (GV->getName() == "llvm.global_dtors") { 10176d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 10186d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitAlignment(Align, 0); 10196d63ee6720540cadb8919037c5d41a6413cc9101zhanyong.wan EmitXXStructorList(GV->getInitializer()); 1020c427f5e8ab231012d7663a0ee408f1225bac971azhanyong.wan 1021 if (TM.getRelocationModel() == Reloc::Static && 1022 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 1023 StringRef Sym(".destructors_used"); 1024 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 1025 MCSA_Reference); 1026 } 1027 return true; 1028 } 1029 1030 return false; 1031} 1032 1033/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 1034/// global in the specified llvm.used list for which emitUsedDirectiveFor 1035/// is true, as being used with this directive. 1036void AsmPrinter::EmitLLVMUsedList(Constant *List) { 1037 // Should be an array of 'i8*'. 1038 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 1039 if (InitList == 0) return; 1040 1041 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 1042 const GlobalValue *GV = 1043 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 1044 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) 1045 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip); 1046 } 1047} 1048 1049/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 1050/// function pointers, ignoring the init priority. 1051void AsmPrinter::EmitXXStructorList(Constant *List) { 1052 // Should be an array of '{ int, void ()* }' structs. The first value is the 1053 // init priority, which we ignore. 1054 if (!isa<ConstantArray>(List)) return; 1055 ConstantArray *InitList = cast<ConstantArray>(List); 1056 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 1057 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 1058 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 1059 1060 if (CS->getOperand(1)->isNullValue()) 1061 return; // Found a null terminator, exit printing. 1062 // Emit the function pointer. 1063 EmitGlobalConstant(CS->getOperand(1)); 1064 } 1065} 1066 1067//===--------------------------------------------------------------------===// 1068// Emission and print routines 1069// 1070 1071/// EmitInt8 - Emit a byte directive and value. 1072/// 1073void AsmPrinter::EmitInt8(int Value) const { 1074 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/); 1075} 1076 1077/// EmitInt16 - Emit a short directive and value. 1078/// 1079void AsmPrinter::EmitInt16(int Value) const { 1080 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/); 1081} 1082 1083/// EmitInt32 - Emit a long directive and value. 1084/// 1085void AsmPrinter::EmitInt32(int Value) const { 1086 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/); 1087} 1088 1089/// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size 1090/// in bytes of the directive is specified by Size and Hi/Lo specify the 1091/// labels. This implicitly uses .set if it is available. 1092void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo, 1093 unsigned Size) const { 1094 // Get the Hi-Lo expression. 1095 const MCExpr *Diff = 1096 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext), 1097 MCSymbolRefExpr::Create(Lo, OutContext), 1098 OutContext); 1099 1100 if (!MAI->hasSetDirective()) { 1101 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/); 1102 return; 1103 } 1104 1105 // Otherwise, emit with .set (aka assignment). 1106 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++); 1107 OutStreamer.EmitAssignment(SetLabel, Diff); 1108 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/); 1109} 1110 1111/// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo" 1112/// where the size in bytes of the directive is specified by Size and Hi/Lo 1113/// specify the labels. This implicitly uses .set if it is available. 1114void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset, 1115 const MCSymbol *Lo, unsigned Size) 1116 const { 1117 1118 // Emit Hi+Offset - Lo 1119 // Get the Hi+Offset expression. 1120 const MCExpr *Plus = 1121 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext), 1122 MCConstantExpr::Create(Offset, OutContext), 1123 OutContext); 1124 1125 // Get the Hi+Offset-Lo expression. 1126 const MCExpr *Diff = 1127 MCBinaryExpr::CreateSub(Plus, 1128 MCSymbolRefExpr::Create(Lo, OutContext), 1129 OutContext); 1130 1131 if (!MAI->hasSetDirective()) 1132 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/); 1133 else { 1134 // Otherwise, emit with .set (aka assignment). 1135 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++); 1136 OutStreamer.EmitAssignment(SetLabel, Diff); 1137 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/); 1138 } 1139} 1140 1141 1142//===----------------------------------------------------------------------===// 1143 1144// EmitAlignment - Emit an alignment directive to the specified power of 1145// two boundary. For example, if you pass in 3 here, you will get an 8 1146// byte alignment. If a global value is specified, and if that global has 1147// an explicit alignment requested, it will unconditionally override the 1148// alignment request. However, if ForcedAlignBits is specified, this value 1149// has final say: the ultimate alignment will be the max of ForcedAlignBits 1150// and the alignment computed with NumBits and the global. 1151// 1152// The algorithm is: 1153// Align = NumBits; 1154// if (GV && GV->hasalignment) Align = GV->getalignment(); 1155// Align = std::max(Align, ForcedAlignBits); 1156// 1157void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 1158 unsigned ForcedAlignBits, 1159 bool UseFillExpr) const { 1160 if (GV && GV->getAlignment()) 1161 NumBits = Log2_32(GV->getAlignment()); 1162 NumBits = std::max(NumBits, ForcedAlignBits); 1163 1164 if (NumBits == 0) return; // No need to emit alignment. 1165 1166 if (getCurrentSection()->getKind().isText()) 1167 OutStreamer.EmitCodeAlignment(1 << NumBits); 1168 else 1169 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0); 1170} 1171 1172//===----------------------------------------------------------------------===// 1173// Constant emission. 1174//===----------------------------------------------------------------------===// 1175 1176/// LowerConstant - Lower the specified LLVM Constant to an MCExpr. 1177/// 1178static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) { 1179 MCContext &Ctx = AP.OutContext; 1180 1181 if (CV->isNullValue() || isa<UndefValue>(CV)) 1182 return MCConstantExpr::Create(0, Ctx); 1183 1184 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) 1185 return MCConstantExpr::Create(CI->getZExtValue(), Ctx); 1186 1187 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 1188 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx); 1189 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) 1190 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx); 1191 1192 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 1193 if (CE == 0) { 1194 llvm_unreachable("Unknown constant value to lower!"); 1195 return MCConstantExpr::Create(0, Ctx); 1196 } 1197 1198 switch (CE->getOpcode()) { 1199 default: 1200 // If the code isn't optimized, there may be outstanding folding 1201 // opportunities. Attempt to fold the expression using TargetData as a 1202 // last resort before giving up. 1203 if (Constant *C = 1204 ConstantFoldConstantExpression(CE, AP.TM.getTargetData())) 1205 if (C != CE) 1206 return LowerConstant(C, AP); 1207#ifndef NDEBUG 1208 CE->dump(); 1209#endif 1210 llvm_unreachable("FIXME: Don't support this constant expr"); 1211 case Instruction::GetElementPtr: { 1212 const TargetData &TD = *AP.TM.getTargetData(); 1213 // Generate a symbolic expression for the byte address 1214 const Constant *PtrVal = CE->getOperand(0); 1215 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end()); 1216 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0], 1217 IdxVec.size()); 1218 1219 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP); 1220 if (Offset == 0) 1221 return Base; 1222 1223 // Truncate/sext the offset to the pointer size. 1224 if (TD.getPointerSizeInBits() != 64) { 1225 int SExtAmount = 64-TD.getPointerSizeInBits(); 1226 Offset = (Offset << SExtAmount) >> SExtAmount; 1227 } 1228 1229 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx), 1230 Ctx); 1231 } 1232 1233 case Instruction::Trunc: 1234 // We emit the value and depend on the assembler to truncate the generated 1235 // expression properly. This is important for differences between 1236 // blockaddress labels. Since the two labels are in the same function, it 1237 // is reasonable to treat their delta as a 32-bit value. 1238 // FALL THROUGH. 1239 case Instruction::BitCast: 1240 return LowerConstant(CE->getOperand(0), AP); 1241 1242 case Instruction::IntToPtr: { 1243 const TargetData &TD = *AP.TM.getTargetData(); 1244 // Handle casts to pointers by changing them into casts to the appropriate 1245 // integer type. This promotes constant folding and simplifies this code. 1246 Constant *Op = CE->getOperand(0); 1247 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()), 1248 false/*ZExt*/); 1249 return LowerConstant(Op, AP); 1250 } 1251 1252 case Instruction::PtrToInt: { 1253 const TargetData &TD = *AP.TM.getTargetData(); 1254 // Support only foldable casts to/from pointers that can be eliminated by 1255 // changing the pointer to the appropriately sized integer type. 1256 Constant *Op = CE->getOperand(0); 1257 const Type *Ty = CE->getType(); 1258 1259 const MCExpr *OpExpr = LowerConstant(Op, AP); 1260 1261 // We can emit the pointer value into this slot if the slot is an 1262 // integer slot equal to the size of the pointer. 1263 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType())) 1264 return OpExpr; 1265 1266 // Otherwise the pointer is smaller than the resultant integer, mask off 1267 // the high bits so we are sure to get a proper truncation if the input is 1268 // a constant expr. 1269 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType()); 1270 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx); 1271 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx); 1272 } 1273 1274 // The MC library also has a right-shift operator, but it isn't consistently 1275 // signed or unsigned between different targets. 1276 case Instruction::Add: 1277 case Instruction::Sub: 1278 case Instruction::Mul: 1279 case Instruction::SDiv: 1280 case Instruction::SRem: 1281 case Instruction::Shl: 1282 case Instruction::And: 1283 case Instruction::Or: 1284 case Instruction::Xor: { 1285 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP); 1286 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP); 1287 switch (CE->getOpcode()) { 1288 default: llvm_unreachable("Unknown binary operator constant cast expr"); 1289 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx); 1290 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx); 1291 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx); 1292 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx); 1293 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx); 1294 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx); 1295 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx); 1296 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx); 1297 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx); 1298 } 1299 } 1300 } 1301} 1302 1303static void EmitGlobalConstantImpl(const Constant *C, unsigned AddrSpace, 1304 AsmPrinter &AP); 1305 1306static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 1307 AsmPrinter &AP) { 1308 if (AddrSpace != 0 || !CA->isString()) { 1309 // Not a string. Print the values in successive locations 1310 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 1311 EmitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP); 1312 return; 1313 } 1314 1315 // Otherwise, it can be emitted as .ascii. 1316 SmallVector<char, 128> TmpVec; 1317 TmpVec.reserve(CA->getNumOperands()); 1318 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 1319 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue()); 1320 1321 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace); 1322} 1323 1324static void EmitGlobalConstantVector(const ConstantVector *CV, 1325 unsigned AddrSpace, AsmPrinter &AP) { 1326 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i) 1327 EmitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP); 1328} 1329 1330static void EmitGlobalConstantStruct(const ConstantStruct *CS, 1331 unsigned AddrSpace, AsmPrinter &AP) { 1332 // Print the fields in successive locations. Pad to align if needed! 1333 const TargetData *TD = AP.TM.getTargetData(); 1334 unsigned Size = TD->getTypeAllocSize(CS->getType()); 1335 const StructLayout *Layout = TD->getStructLayout(CS->getType()); 1336 uint64_t SizeSoFar = 0; 1337 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 1338 const Constant *Field = CS->getOperand(i); 1339 1340 // Check if padding is needed and insert one or more 0s. 1341 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType()); 1342 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1)) 1343 - Layout->getElementOffset(i)) - FieldSize; 1344 SizeSoFar += FieldSize + PadSize; 1345 1346 // Now print the actual field value. 1347 EmitGlobalConstantImpl(Field, AddrSpace, AP); 1348 1349 // Insert padding - this may include padding to increase the size of the 1350 // current field up to the ABI size (if the struct is not packed) as well 1351 // as padding to ensure that the next field starts at the right offset. 1352 AP.OutStreamer.EmitZeros(PadSize, AddrSpace); 1353 } 1354 assert(SizeSoFar == Layout->getSizeInBytes() && 1355 "Layout of constant struct may be incorrect!"); 1356} 1357 1358static void EmitGlobalConstantUnion(const ConstantUnion *CU, 1359 unsigned AddrSpace, AsmPrinter &AP) { 1360 const TargetData *TD = AP.TM.getTargetData(); 1361 unsigned Size = TD->getTypeAllocSize(CU->getType()); 1362 1363 const Constant *Contents = CU->getOperand(0); 1364 unsigned FilledSize = TD->getTypeAllocSize(Contents->getType()); 1365 1366 // Print the actually filled part 1367 EmitGlobalConstantImpl(Contents, AddrSpace, AP); 1368 1369 // And pad with enough zeroes 1370 AP.OutStreamer.EmitZeros(Size-FilledSize, AddrSpace); 1371} 1372 1373static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace, 1374 AsmPrinter &AP) { 1375 // FP Constants are printed as integer constants to avoid losing 1376 // precision. 1377 if (CFP->getType()->isDoubleTy()) { 1378 if (AP.isVerbose()) { 1379 double Val = CFP->getValueAPF().convertToDouble(); 1380 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'; 1381 } 1382 1383 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1384 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1385 return; 1386 } 1387 1388 if (CFP->getType()->isFloatTy()) { 1389 if (AP.isVerbose()) { 1390 float Val = CFP->getValueAPF().convertToFloat(); 1391 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'; 1392 } 1393 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1394 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace); 1395 return; 1396 } 1397 1398 if (CFP->getType()->isX86_FP80Ty()) { 1399 // all long double variants are printed as hex 1400 // API needed to prevent premature destruction 1401 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1402 const uint64_t *p = API.getRawData(); 1403 if (AP.isVerbose()) { 1404 // Convert to double so we can print the approximate val as a comment. 1405 APFloat DoubleVal = CFP->getValueAPF(); 1406 bool ignored; 1407 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1408 &ignored); 1409 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= " 1410 << DoubleVal.convertToDouble() << '\n'; 1411 } 1412 1413 if (AP.TM.getTargetData()->isBigEndian()) { 1414 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1415 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1416 } else { 1417 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1418 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1419 } 1420 1421 // Emit the tail padding for the long double. 1422 const TargetData &TD = *AP.TM.getTargetData(); 1423 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 1424 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 1425 return; 1426 } 1427 1428 assert(CFP->getType()->isPPC_FP128Ty() && 1429 "Floating point constant type not handled"); 1430 // All long double variants are printed as hex 1431 // API needed to prevent premature destruction. 1432 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1433 const uint64_t *p = API.getRawData(); 1434 if (AP.TM.getTargetData()->isBigEndian()) { 1435 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1436 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1437 } else { 1438 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1439 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1440 } 1441} 1442 1443static void EmitGlobalConstantLargeInt(const ConstantInt *CI, 1444 unsigned AddrSpace, AsmPrinter &AP) { 1445 const TargetData *TD = AP.TM.getTargetData(); 1446 unsigned BitWidth = CI->getBitWidth(); 1447 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1448 1449 // We don't expect assemblers to support integer data directives 1450 // for more than 64 bits, so we emit the data in at most 64-bit 1451 // quantities at a time. 1452 const uint64_t *RawData = CI->getValue().getRawData(); 1453 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1454 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i]; 1455 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1456 } 1457} 1458 1459static void EmitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace, 1460 AsmPrinter &AP) { 1461 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) { 1462 uint64_t Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType()); 1463 return AP.OutStreamer.EmitZeros(Size, AddrSpace); 1464 } 1465 1466 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1467 unsigned Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType()); 1468 switch (Size) { 1469 case 1: 1470 case 2: 1471 case 4: 1472 case 8: 1473 if (AP.isVerbose()) 1474 AP.OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue()); 1475 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace); 1476 return; 1477 default: 1478 EmitGlobalConstantLargeInt(CI, AddrSpace, AP); 1479 return; 1480 } 1481 } 1482 1483 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 1484 return EmitGlobalConstantArray(CVA, AddrSpace, AP); 1485 1486 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 1487 return EmitGlobalConstantStruct(CVS, AddrSpace, AP); 1488 1489 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1490 return EmitGlobalConstantFP(CFP, AddrSpace, AP); 1491 1492 if (isa<ConstantPointerNull>(CV)) { 1493 unsigned Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType()); 1494 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace); 1495 return; 1496 } 1497 1498 if (const ConstantUnion *CVU = dyn_cast<ConstantUnion>(CV)) 1499 return EmitGlobalConstantUnion(CVU, AddrSpace, AP); 1500 1501 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1502 return EmitGlobalConstantVector(V, AddrSpace, AP); 1503 1504 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it 1505 // thread the streamer with EmitValue. 1506 AP.OutStreamer.EmitValue(LowerConstant(CV, AP), 1507 AP.TM.getTargetData()->getTypeAllocSize(CV->getType()), 1508 AddrSpace); 1509} 1510 1511/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1512void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1513 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1514 if (Size) 1515 EmitGlobalConstantImpl(CV, AddrSpace, *this); 1516 else if (MAI->hasSubsectionsViaSymbols()) { 1517 // If the global has zero size, emit a single byte so that two labels don't 1518 // look like they are at the same location. 1519 OutStreamer.EmitIntValue(0, 1, AddrSpace); 1520 } 1521} 1522 1523void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1524 // Target doesn't support this yet! 1525 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1526} 1527 1528void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const { 1529 if (Offset > 0) 1530 OS << '+' << Offset; 1531 else if (Offset < 0) 1532 OS << Offset; 1533} 1534 1535//===----------------------------------------------------------------------===// 1536// Symbol Lowering Routines. 1537//===----------------------------------------------------------------------===// 1538 1539/// GetTempSymbol - Return the MCSymbol corresponding to the assembler 1540/// temporary label with the specified stem and unique ID. 1541MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const { 1542 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + 1543 Name + Twine(ID)); 1544} 1545 1546/// GetTempSymbol - Return an assembler temporary label with the specified 1547/// stem. 1548MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const { 1549 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+ 1550 Name); 1551} 1552 1553 1554MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const { 1555 return MMI->getAddrLabelSymbol(BA->getBasicBlock()); 1556} 1557 1558MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const { 1559 return MMI->getAddrLabelSymbol(BB); 1560} 1561 1562/// GetCPISymbol - Return the symbol for the specified constant pool entry. 1563MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const { 1564 return OutContext.GetOrCreateSymbol 1565 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber()) 1566 + "_" + Twine(CPID)); 1567} 1568 1569/// GetJTISymbol - Return the symbol for the specified jump table entry. 1570MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const { 1571 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate); 1572} 1573 1574/// GetJTSetSymbol - Return the symbol for the specified jump table .set 1575/// FIXME: privatize to AsmPrinter. 1576MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const { 1577 return OutContext.GetOrCreateSymbol 1578 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" + 1579 Twine(UID) + "_set_" + Twine(MBBID)); 1580} 1581 1582/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1583/// global value name as its base, with the specified suffix, and where the 1584/// symbol is forced to have private linkage if ForcePrivate is true. 1585MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1586 StringRef Suffix, 1587 bool ForcePrivate) const { 1588 SmallString<60> NameStr; 1589 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1590 NameStr.append(Suffix.begin(), Suffix.end()); 1591 return OutContext.GetOrCreateSymbol(NameStr.str()); 1592} 1593 1594/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1595/// ExternalSymbol. 1596MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1597 SmallString<60> NameStr; 1598 Mang->getNameWithPrefix(NameStr, Sym); 1599 return OutContext.GetOrCreateSymbol(NameStr.str()); 1600} 1601 1602 1603 1604/// PrintParentLoopComment - Print comments about parent loops of this one. 1605static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1606 unsigned FunctionNumber) { 1607 if (Loop == 0) return; 1608 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber); 1609 OS.indent(Loop->getLoopDepth()*2) 1610 << "Parent Loop BB" << FunctionNumber << "_" 1611 << Loop->getHeader()->getNumber() 1612 << " Depth=" << Loop->getLoopDepth() << '\n'; 1613} 1614 1615 1616/// PrintChildLoopComment - Print comments about child loops within 1617/// the loop for this basic block, with nesting. 1618static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1619 unsigned FunctionNumber) { 1620 // Add child loop information 1621 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){ 1622 OS.indent((*CL)->getLoopDepth()*2) 1623 << "Child Loop BB" << FunctionNumber << "_" 1624 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth() 1625 << '\n'; 1626 PrintChildLoopComment(OS, *CL, FunctionNumber); 1627 } 1628} 1629 1630/// EmitBasicBlockLoopComments - Pretty-print comments for basic blocks. 1631static void EmitBasicBlockLoopComments(const MachineBasicBlock &MBB, 1632 const MachineLoopInfo *LI, 1633 const AsmPrinter &AP) { 1634 // Add loop depth information 1635 const MachineLoop *Loop = LI->getLoopFor(&MBB); 1636 if (Loop == 0) return; 1637 1638 MachineBasicBlock *Header = Loop->getHeader(); 1639 assert(Header && "No header for loop"); 1640 1641 // If this block is not a loop header, just print out what is the loop header 1642 // and return. 1643 if (Header != &MBB) { 1644 AP.OutStreamer.AddComment(" in Loop: Header=BB" + 1645 Twine(AP.getFunctionNumber())+"_" + 1646 Twine(Loop->getHeader()->getNumber())+ 1647 " Depth="+Twine(Loop->getLoopDepth())); 1648 return; 1649 } 1650 1651 // Otherwise, it is a loop header. Print out information about child and 1652 // parent loops. 1653 raw_ostream &OS = AP.OutStreamer.GetCommentOS(); 1654 1655 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber()); 1656 1657 OS << "=>"; 1658 OS.indent(Loop->getLoopDepth()*2-2); 1659 1660 OS << "This "; 1661 if (Loop->empty()) 1662 OS << "Inner "; 1663 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n'; 1664 1665 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber()); 1666} 1667 1668 1669/// EmitBasicBlockStart - This method prints the label for the specified 1670/// MachineBasicBlock, an alignment (if present) and a comment describing 1671/// it if appropriate. 1672void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1673 // Emit an alignment directive for this block, if needed. 1674 if (unsigned Align = MBB->getAlignment()) 1675 EmitAlignment(Log2_32(Align)); 1676 1677 // If the block has its address taken, emit any labels that were used to 1678 // reference the block. It is possible that there is more than one label 1679 // here, because multiple LLVM BB's may have been RAUW'd to this block after 1680 // the references were generated. 1681 if (MBB->hasAddressTaken()) { 1682 const BasicBlock *BB = MBB->getBasicBlock(); 1683 if (isVerbose()) 1684 OutStreamer.AddComment("Block address taken"); 1685 1686 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB); 1687 1688 for (unsigned i = 0, e = Syms.size(); i != e; ++i) 1689 OutStreamer.EmitLabel(Syms[i]); 1690 } 1691 1692 // Print the main label for the block. 1693 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) { 1694 if (isVerbose() && OutStreamer.hasRawTextSupport()) { 1695 if (const BasicBlock *BB = MBB->getBasicBlock()) 1696 if (BB->hasName()) 1697 OutStreamer.AddComment("%" + BB->getName()); 1698 1699 EmitBasicBlockLoopComments(*MBB, LI, *this); 1700 1701 // NOTE: Want this comment at start of line, don't emit with AddComment. 1702 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" + 1703 Twine(MBB->getNumber()) + ":"); 1704 } 1705 } else { 1706 if (isVerbose()) { 1707 if (const BasicBlock *BB = MBB->getBasicBlock()) 1708 if (BB->hasName()) 1709 OutStreamer.AddComment("%" + BB->getName()); 1710 EmitBasicBlockLoopComments(*MBB, LI, *this); 1711 } 1712 1713 OutStreamer.EmitLabel(MBB->getSymbol()); 1714 } 1715} 1716 1717void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const { 1718 MCSymbolAttr Attr = MCSA_Invalid; 1719 1720 switch (Visibility) { 1721 default: break; 1722 case GlobalValue::HiddenVisibility: 1723 Attr = MAI->getHiddenVisibilityAttr(); 1724 break; 1725 case GlobalValue::ProtectedVisibility: 1726 Attr = MAI->getProtectedVisibilityAttr(); 1727 break; 1728 } 1729 1730 if (Attr != MCSA_Invalid) 1731 OutStreamer.EmitSymbolAttribute(Sym, Attr); 1732} 1733 1734/// isBlockOnlyReachableByFallthough - Return true if the basic block has 1735/// exactly one predecessor and the control transfer mechanism between 1736/// the predecessor and this block is a fall-through. 1737bool AsmPrinter:: 1738isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const { 1739 // If this is a landing pad, it isn't a fall through. If it has no preds, 1740 // then nothing falls through to it. 1741 if (MBB->isLandingPad() || MBB->pred_empty()) 1742 return false; 1743 1744 // If there isn't exactly one predecessor, it can't be a fall through. 1745 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI; 1746 ++PI2; 1747 if (PI2 != MBB->pred_end()) 1748 return false; 1749 1750 // The predecessor has to be immediately before this block. 1751 const MachineBasicBlock *Pred = *PI; 1752 1753 if (!Pred->isLayoutSuccessor(MBB)) 1754 return false; 1755 1756 // If the block is completely empty, then it definitely does fall through. 1757 if (Pred->empty()) 1758 return true; 1759 1760 // Otherwise, check the last instruction. 1761 const MachineInstr &LastInst = Pred->back(); 1762 return !LastInst.getDesc().isBarrier(); 1763} 1764 1765 1766 1767GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1768 if (!S->usesMetadata()) 1769 return 0; 1770 1771 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters); 1772 gcp_map_type::iterator GCPI = GCMap.find(S); 1773 if (GCPI != GCMap.end()) 1774 return GCPI->second; 1775 1776 const char *Name = S->getName().c_str(); 1777 1778 for (GCMetadataPrinterRegistry::iterator 1779 I = GCMetadataPrinterRegistry::begin(), 1780 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1781 if (strcmp(Name, I->getName()) == 0) { 1782 GCMetadataPrinter *GMP = I->instantiate(); 1783 GMP->S = S; 1784 GCMap.insert(std::make_pair(S, GMP)); 1785 return GMP; 1786 } 1787 1788 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name)); 1789 return 0; 1790} 1791 1792