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98cdab53c3
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98124 91177308-0d34-0410-b5e6-96231b3b80d8
1854 lines
67 KiB
C++
1854 lines
67 KiB
C++
//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the AsmPrinter class.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/GCMetadataPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/Analysis/ConstantFolding.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/FormattedStream.h"
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#include <cerrno>
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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char AsmPrinter::ID = 0;
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AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
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MCContext &Ctx, MCStreamer &Streamer,
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const MCAsmInfo *T)
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: MachineFunctionPass(&ID), O(o),
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TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
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OutContext(Ctx), OutStreamer(Streamer),
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LastMI(0), LastFn(0), Counter(~0U), SetCounter(0), PrevDLT(NULL) {
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DW = 0; MMI = 0;
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VerboseAsm = Streamer.isVerboseAsm();
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}
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AsmPrinter::~AsmPrinter() {
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for (gcp_iterator I = GCMetadataPrinters.begin(),
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E = GCMetadataPrinters.end(); I != E; ++I)
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delete I->second;
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delete &OutStreamer;
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delete &OutContext;
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}
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/// getFunctionNumber - Return a unique ID for the current function.
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///
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unsigned AsmPrinter::getFunctionNumber() const {
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return MF->getFunctionNumber();
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}
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TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
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return TM.getTargetLowering()->getObjFileLowering();
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}
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/// getCurrentSection() - Return the current section we are emitting to.
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const MCSection *AsmPrinter::getCurrentSection() const {
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return OutStreamer.getCurrentSection();
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}
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void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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AU.addRequired<GCModuleInfo>();
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if (VerboseAsm)
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AU.addRequired<MachineLoopInfo>();
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}
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bool AsmPrinter::doInitialization(Module &M) {
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// Initialize TargetLoweringObjectFile.
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const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
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.Initialize(OutContext, TM);
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Mang = new Mangler(*MAI);
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// Allow the target to emit any magic that it wants at the start of the file.
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EmitStartOfAsmFile(M);
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// Very minimal debug info. It is ignored if we emit actual debug info. If we
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// don't, this at least helps the user find where a global came from.
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if (MAI->hasSingleParameterDotFile()) {
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// .file "foo.c"
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OutStreamer.EmitFileDirective(M.getModuleIdentifier());
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}
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GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
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assert(MI && "AsmPrinter didn't require GCModuleInfo?");
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for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
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if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
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MP->beginAssembly(O, *this, *MAI);
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if (!M.getModuleInlineAsm().empty())
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O << MAI->getCommentString() << " Start of file scope inline assembly\n"
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<< M.getModuleInlineAsm()
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<< '\n' << MAI->getCommentString()
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<< " End of file scope inline assembly\n";
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MMI = getAnalysisIfAvailable<MachineModuleInfo>();
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if (MMI)
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MMI->AnalyzeModule(M);
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DW = getAnalysisIfAvailable<DwarfWriter>();
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if (DW)
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DW->BeginModule(&M, MMI, O, this, MAI);
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return false;
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}
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void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
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switch ((GlobalValue::LinkageTypes)Linkage) {
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case GlobalValue::CommonLinkage:
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case GlobalValue::LinkOnceAnyLinkage:
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case GlobalValue::LinkOnceODRLinkage:
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case GlobalValue::WeakAnyLinkage:
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case GlobalValue::WeakODRLinkage:
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case GlobalValue::LinkerPrivateLinkage:
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if (MAI->getWeakDefDirective() != 0) {
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// .globl _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
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// .weak_definition _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
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} else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
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// .globl _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
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// FIXME: linkonce should be a section attribute, handled by COFF Section
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// assignment.
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// http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
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// .linkonce discard
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// FIXME: It would be nice to use .linkonce samesize for non-common
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// globals.
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O << LinkOnce;
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} else {
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// .weak _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
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}
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break;
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case GlobalValue::DLLExportLinkage:
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables should go into a section of
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// their name or something. For now, just emit them as external.
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case GlobalValue::ExternalLinkage:
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// If external or appending, declare as a global symbol.
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// .globl _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
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break;
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case GlobalValue::PrivateLinkage:
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case GlobalValue::InternalLinkage:
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break;
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default:
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llvm_unreachable("Unknown linkage type!");
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}
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}
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/// EmitGlobalVariable - Emit the specified global variable to the .s file.
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void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
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if (!GV->hasInitializer()) // External globals require no code.
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return;
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// Check to see if this is a special global used by LLVM, if so, emit it.
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if (EmitSpecialLLVMGlobal(GV))
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return;
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MCSymbol *GVSym = GetGlobalValueSymbol(GV);
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EmitVisibility(GVSym, GV->getVisibility());
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if (MAI->hasDotTypeDotSizeDirective())
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
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SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
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const TargetData *TD = TM.getTargetData();
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unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
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unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
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// Handle common and BSS local symbols (.lcomm).
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if (GVKind.isCommon() || GVKind.isBSSLocal()) {
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if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
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if (VerboseAsm) {
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WriteAsOperand(OutStreamer.GetCommentOS(), GV,
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/*PrintType=*/false, GV->getParent());
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OutStreamer.GetCommentOS() << '\n';
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}
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// Handle common symbols.
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if (GVKind.isCommon()) {
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// .comm _foo, 42, 4
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OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
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return;
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}
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// Handle local BSS symbols.
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if (MAI->hasMachoZeroFillDirective()) {
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const MCSection *TheSection =
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getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
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// .zerofill __DATA, __bss, _foo, 400, 5
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OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
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return;
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}
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if (MAI->hasLCOMMDirective()) {
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// .lcomm _foo, 42
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OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
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return;
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}
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// .local _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
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// .comm _foo, 42, 4
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OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
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return;
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}
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const MCSection *TheSection =
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getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
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// Handle the zerofill directive on darwin, which is a special form of BSS
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// emission.
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if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
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// .globl _foo
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
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// .zerofill __DATA, __common, _foo, 400, 5
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OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
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return;
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}
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OutStreamer.SwitchSection(TheSection);
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EmitLinkage(GV->getLinkage(), GVSym);
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EmitAlignment(AlignLog, GV);
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if (VerboseAsm) {
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WriteAsOperand(OutStreamer.GetCommentOS(), GV,
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/*PrintType=*/false, GV->getParent());
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OutStreamer.GetCommentOS() << '\n';
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}
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OutStreamer.EmitLabel(GVSym);
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EmitGlobalConstant(GV->getInitializer());
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if (MAI->hasDotTypeDotSizeDirective())
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// .size foo, 42
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OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
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OutStreamer.AddBlankLine();
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}
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/// EmitFunctionHeader - This method emits the header for the current
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/// function.
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void AsmPrinter::EmitFunctionHeader() {
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// Print out constants referenced by the function
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EmitConstantPool();
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// Print the 'header' of function.
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const Function *F = MF->getFunction();
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
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EmitVisibility(CurrentFnSym, F->getVisibility());
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EmitLinkage(F->getLinkage(), CurrentFnSym);
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EmitAlignment(MF->getAlignment(), F);
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if (MAI->hasDotTypeDotSizeDirective())
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OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
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if (VerboseAsm) {
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WriteAsOperand(OutStreamer.GetCommentOS(), F,
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/*PrintType=*/false, F->getParent());
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OutStreamer.GetCommentOS() << '\n';
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}
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// Emit the CurrentFnSym. This is a virtual function to allow targets to
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// do their wild and crazy things as required.
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EmitFunctionEntryLabel();
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// Add some workaround for linkonce linkage on Cygwin\MinGW.
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if (MAI->getLinkOnceDirective() != 0 &&
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(F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
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// FIXME: What is this?
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O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
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// Emit pre-function debug and/or EH information.
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if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
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DW->BeginFunction(MF);
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}
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/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
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/// function. This can be overridden by targets as required to do custom stuff.
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void AsmPrinter::EmitFunctionEntryLabel() {
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OutStreamer.EmitLabel(CurrentFnSym);
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}
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/// EmitComments - Pretty-print comments for instructions.
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static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
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const MachineFunction *MF = MI.getParent()->getParent();
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const TargetMachine &TM = MF->getTarget();
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if (!MI.getDebugLoc().isUnknown()) {
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DILocation DLT = MF->getDILocation(MI.getDebugLoc());
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// Print source line info.
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DIScope Scope = DLT.getScope();
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// Omit the directory, because it's likely to be long and uninteresting.
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if (Scope.Verify())
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CommentOS << Scope.getFilename();
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else
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CommentOS << "<unknown>";
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CommentOS << ':' << DLT.getLineNumber();
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if (DLT.getColumnNumber() != 0)
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CommentOS << ':' << DLT.getColumnNumber();
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CommentOS << '\n';
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}
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// Check for spills and reloads
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int FI;
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const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
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// We assume a single instruction only has a spill or reload, not
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// both.
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const MachineMemOperand *MMO;
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if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
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if (FrameInfo->isSpillSlotObjectIndex(FI)) {
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MMO = *MI.memoperands_begin();
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CommentOS << MMO->getSize() << "-byte Reload\n";
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}
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} else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
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if (FrameInfo->isSpillSlotObjectIndex(FI))
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CommentOS << MMO->getSize() << "-byte Folded Reload\n";
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} else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
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if (FrameInfo->isSpillSlotObjectIndex(FI)) {
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MMO = *MI.memoperands_begin();
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CommentOS << MMO->getSize() << "-byte Spill\n";
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}
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} else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
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if (FrameInfo->isSpillSlotObjectIndex(FI))
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CommentOS << MMO->getSize() << "-byte Folded Spill\n";
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}
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// Check for spill-induced copies
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unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
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if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
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SrcSubIdx, DstSubIdx)) {
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if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
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CommentOS << " Reload Reuse\n";
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}
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}
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/// EmitFunctionBody - This method emits the body and trailer for a
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/// function.
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void AsmPrinter::EmitFunctionBody() {
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// Emit target-specific gunk before the function body.
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EmitFunctionBodyStart();
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// Print out code for the function.
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bool HasAnyRealCode = false;
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for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
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I != E; ++I) {
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// Print a label for the basic block.
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EmitBasicBlockStart(I);
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for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
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II != IE; ++II) {
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// Print the assembly for the instruction.
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if (!II->isLabel())
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HasAnyRealCode = true;
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++EmittedInsts;
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// FIXME: Clean up processDebugLoc.
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processDebugLoc(II, true);
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if (VerboseAsm)
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EmitComments(*II, OutStreamer.GetCommentOS());
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switch (II->getOpcode()) {
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case TargetOpcode::DBG_LABEL:
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case TargetOpcode::EH_LABEL:
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case TargetOpcode::GC_LABEL:
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printLabelInst(II);
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break;
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case TargetOpcode::INLINEASM:
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printInlineAsm(II);
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break;
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case TargetOpcode::IMPLICIT_DEF:
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printImplicitDef(II);
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break;
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case TargetOpcode::KILL:
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printKill(II);
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break;
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default:
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EmitInstruction(II);
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break;
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}
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// FIXME: Clean up processDebugLoc.
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processDebugLoc(II, false);
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}
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}
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// If the function is empty and the object file uses .subsections_via_symbols,
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// then we need to emit *something* to the function body to prevent the
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// labels from collapsing together. Just emit a 0 byte.
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if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
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OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
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// Emit target-specific gunk after the function body.
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EmitFunctionBodyEnd();
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if (MAI->hasDotTypeDotSizeDirective())
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O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
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// Emit post-function debug information.
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if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
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DW->EndFunction(MF);
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// Print out jump tables referenced by the function.
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EmitJumpTableInfo();
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OutStreamer.AddBlankLine();
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}
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bool AsmPrinter::doFinalization(Module &M) {
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// Emit global variables.
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I)
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EmitGlobalVariable(I);
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// Emit final debug information.
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if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
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DW->EndModule();
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// If the target wants to know about weak references, print them all.
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if (MAI->getWeakRefDirective()) {
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// FIXME: This is not lazy, it would be nice to only print weak references
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// to stuff that is actually used. Note that doing so would require targets
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// to notice uses in operands (due to constant exprs etc). This should
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// happen with the MC stuff eventually.
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// Print out module-level global variables here.
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
|
|
I != E; ++I) {
|
|
if (!I->hasExternalWeakLinkage()) continue;
|
|
OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
|
|
MCSA_WeakReference);
|
|
}
|
|
|
|
for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
|
|
if (!I->hasExternalWeakLinkage()) continue;
|
|
OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
|
|
MCSA_WeakReference);
|
|
}
|
|
}
|
|
|
|
if (MAI->hasSetDirective()) {
|
|
OutStreamer.AddBlankLine();
|
|
for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
|
|
I != E; ++I) {
|
|
MCSymbol *Name = GetGlobalValueSymbol(I);
|
|
|
|
const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
|
|
MCSymbol *Target = GetGlobalValueSymbol(GV);
|
|
|
|
if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
|
|
OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
|
|
else if (I->hasWeakLinkage())
|
|
OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
|
|
else
|
|
assert(I->hasLocalLinkage() && "Invalid alias linkage");
|
|
|
|
EmitVisibility(Name, I->getVisibility());
|
|
|
|
// Emit the directives as assignments aka .set:
|
|
OutStreamer.EmitAssignment(Name,
|
|
MCSymbolRefExpr::Create(Target, OutContext));
|
|
}
|
|
}
|
|
|
|
GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
|
|
assert(MI && "AsmPrinter didn't require GCModuleInfo?");
|
|
for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
|
|
if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
|
|
MP->finishAssembly(O, *this, *MAI);
|
|
|
|
// If we don't have any trampolines, then we don't require stack memory
|
|
// to be executable. Some targets have a directive to declare this.
|
|
Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
|
|
if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
|
|
if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
|
|
OutStreamer.SwitchSection(S);
|
|
|
|
// Allow the target to emit any magic that it wants at the end of the file,
|
|
// after everything else has gone out.
|
|
EmitEndOfAsmFile(M);
|
|
|
|
delete Mang; Mang = 0;
|
|
DW = 0; MMI = 0;
|
|
|
|
OutStreamer.Finish();
|
|
return false;
|
|
}
|
|
|
|
void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
|
|
this->MF = &MF;
|
|
// Get the function symbol.
|
|
CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
|
|
|
|
if (VerboseAsm)
|
|
LI = &getAnalysis<MachineLoopInfo>();
|
|
}
|
|
|
|
namespace {
|
|
// SectionCPs - Keep track the alignment, constpool entries per Section.
|
|
struct SectionCPs {
|
|
const MCSection *S;
|
|
unsigned Alignment;
|
|
SmallVector<unsigned, 4> CPEs;
|
|
SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
|
|
};
|
|
}
|
|
|
|
/// EmitConstantPool - Print to the current output stream assembly
|
|
/// representations of the constants in the constant pool MCP. This is
|
|
/// used to print out constants which have been "spilled to memory" by
|
|
/// the code generator.
|
|
///
|
|
void AsmPrinter::EmitConstantPool() {
|
|
const MachineConstantPool *MCP = MF->getConstantPool();
|
|
const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
|
|
if (CP.empty()) return;
|
|
|
|
// Calculate sections for constant pool entries. We collect entries to go into
|
|
// the same section together to reduce amount of section switch statements.
|
|
SmallVector<SectionCPs, 4> CPSections;
|
|
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
|
|
const MachineConstantPoolEntry &CPE = CP[i];
|
|
unsigned Align = CPE.getAlignment();
|
|
|
|
SectionKind Kind;
|
|
switch (CPE.getRelocationInfo()) {
|
|
default: llvm_unreachable("Unknown section kind");
|
|
case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
|
|
case 1:
|
|
Kind = SectionKind::getReadOnlyWithRelLocal();
|
|
break;
|
|
case 0:
|
|
switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
|
|
case 4: Kind = SectionKind::getMergeableConst4(); break;
|
|
case 8: Kind = SectionKind::getMergeableConst8(); break;
|
|
case 16: Kind = SectionKind::getMergeableConst16();break;
|
|
default: Kind = SectionKind::getMergeableConst(); break;
|
|
}
|
|
}
|
|
|
|
const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
|
|
|
|
// The number of sections are small, just do a linear search from the
|
|
// last section to the first.
|
|
bool Found = false;
|
|
unsigned SecIdx = CPSections.size();
|
|
while (SecIdx != 0) {
|
|
if (CPSections[--SecIdx].S == S) {
|
|
Found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!Found) {
|
|
SecIdx = CPSections.size();
|
|
CPSections.push_back(SectionCPs(S, Align));
|
|
}
|
|
|
|
if (Align > CPSections[SecIdx].Alignment)
|
|
CPSections[SecIdx].Alignment = Align;
|
|
CPSections[SecIdx].CPEs.push_back(i);
|
|
}
|
|
|
|
// Now print stuff into the calculated sections.
|
|
for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
|
|
OutStreamer.SwitchSection(CPSections[i].S);
|
|
EmitAlignment(Log2_32(CPSections[i].Alignment));
|
|
|
|
unsigned Offset = 0;
|
|
for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
|
|
unsigned CPI = CPSections[i].CPEs[j];
|
|
MachineConstantPoolEntry CPE = CP[CPI];
|
|
|
|
// Emit inter-object padding for alignment.
|
|
unsigned AlignMask = CPE.getAlignment() - 1;
|
|
unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
|
|
OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
|
|
|
|
const Type *Ty = CPE.getType();
|
|
Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
|
|
|
|
// Emit the label with a comment on it.
|
|
if (VerboseAsm) {
|
|
OutStreamer.GetCommentOS() << "constant pool ";
|
|
WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
|
|
MF->getFunction()->getParent());
|
|
OutStreamer.GetCommentOS() << '\n';
|
|
}
|
|
OutStreamer.EmitLabel(GetCPISymbol(CPI));
|
|
|
|
if (CPE.isMachineConstantPoolEntry())
|
|
EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
|
|
else
|
|
EmitGlobalConstant(CPE.Val.ConstVal);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// EmitJumpTableInfo - Print assembly representations of the jump tables used
|
|
/// by the current function to the current output stream.
|
|
///
|
|
void AsmPrinter::EmitJumpTableInfo() {
|
|
const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
|
|
if (MJTI == 0) return;
|
|
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
|
|
if (JT.empty()) return;
|
|
|
|
// Pick the directive to use to print the jump table entries, and switch to
|
|
// the appropriate section.
|
|
const Function *F = MF->getFunction();
|
|
bool JTInDiffSection = false;
|
|
if (// In PIC mode, we need to emit the jump table to the same section as the
|
|
// function body itself, otherwise the label differences won't make sense.
|
|
// FIXME: Need a better predicate for this: what about custom entries?
|
|
MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
|
|
// We should also do if the section name is NULL or function is declared
|
|
// in discardable section
|
|
// FIXME: this isn't the right predicate, should be based on the MCSection
|
|
// for the function.
|
|
F->isWeakForLinker()) {
|
|
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
|
|
} else {
|
|
// Otherwise, drop it in the readonly section.
|
|
const MCSection *ReadOnlySection =
|
|
getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
|
|
OutStreamer.SwitchSection(ReadOnlySection);
|
|
JTInDiffSection = true;
|
|
}
|
|
|
|
EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
|
|
|
|
for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
|
|
const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
|
|
|
|
// If this jump table was deleted, ignore it.
|
|
if (JTBBs.empty()) continue;
|
|
|
|
// For the EK_LabelDifference32 entry, if the target supports .set, emit a
|
|
// .set directive for each unique entry. This reduces the number of
|
|
// relocations the assembler will generate for the jump table.
|
|
if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
|
|
MAI->hasSetDirective()) {
|
|
SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
|
|
const TargetLowering *TLI = TM.getTargetLowering();
|
|
const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
|
|
for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
|
|
const MachineBasicBlock *MBB = JTBBs[ii];
|
|
if (!EmittedSets.insert(MBB)) continue;
|
|
|
|
// .set LJTSet, LBB32-base
|
|
const MCExpr *LHS =
|
|
MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
|
|
OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
|
|
MCBinaryExpr::CreateSub(LHS, Base, OutContext));
|
|
}
|
|
}
|
|
|
|
// On some targets (e.g. Darwin) we want to emit two consequtive labels
|
|
// before each jump table. The first label is never referenced, but tells
|
|
// the assembler and linker the extents of the jump table object. The
|
|
// second label is actually referenced by the code.
|
|
if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
|
|
// FIXME: This doesn't have to have any specific name, just any randomly
|
|
// named and numbered 'l' label would work. Simplify GetJTISymbol.
|
|
OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
|
|
|
|
OutStreamer.EmitLabel(GetJTISymbol(JTI));
|
|
|
|
for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
|
|
EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
|
|
}
|
|
}
|
|
|
|
/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
|
|
/// current stream.
|
|
void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
|
|
const MachineBasicBlock *MBB,
|
|
unsigned UID) const {
|
|
const MCExpr *Value = 0;
|
|
switch (MJTI->getEntryKind()) {
|
|
case MachineJumpTableInfo::EK_Custom32:
|
|
Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
|
|
OutContext);
|
|
break;
|
|
case MachineJumpTableInfo::EK_BlockAddress:
|
|
// EK_BlockAddress - Each entry is a plain address of block, e.g.:
|
|
// .word LBB123
|
|
Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
|
|
break;
|
|
case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
|
|
// EK_GPRel32BlockAddress - Each entry is an address of block, encoded
|
|
// with a relocation as gp-relative, e.g.:
|
|
// .gprel32 LBB123
|
|
MCSymbol *MBBSym = MBB->getSymbol(OutContext);
|
|
OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
|
|
return;
|
|
}
|
|
|
|
case MachineJumpTableInfo::EK_LabelDifference32: {
|
|
// EK_LabelDifference32 - Each entry is the address of the block minus
|
|
// the address of the jump table. This is used for PIC jump tables where
|
|
// gprel32 is not supported. e.g.:
|
|
// .word LBB123 - LJTI1_2
|
|
// If the .set directive is supported, this is emitted as:
|
|
// .set L4_5_set_123, LBB123 - LJTI1_2
|
|
// .word L4_5_set_123
|
|
|
|
// If we have emitted set directives for the jump table entries, print
|
|
// them rather than the entries themselves. If we're emitting PIC, then
|
|
// emit the table entries as differences between two text section labels.
|
|
if (MAI->hasSetDirective()) {
|
|
// If we used .set, reference the .set's symbol.
|
|
Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
|
|
OutContext);
|
|
break;
|
|
}
|
|
// Otherwise, use the difference as the jump table entry.
|
|
Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
|
|
const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
|
|
Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
|
|
break;
|
|
}
|
|
}
|
|
|
|
assert(Value && "Unknown entry kind!");
|
|
|
|
unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
|
|
OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
|
|
}
|
|
|
|
|
|
/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
|
|
/// special global used by LLVM. If so, emit it and return true, otherwise
|
|
/// do nothing and return false.
|
|
bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
|
|
if (GV->getName() == "llvm.used") {
|
|
if (MAI->hasNoDeadStrip()) // No need to emit this at all.
|
|
EmitLLVMUsedList(GV->getInitializer());
|
|
return true;
|
|
}
|
|
|
|
// Ignore debug and non-emitted data. This handles llvm.compiler.used.
|
|
if (GV->getSection() == "llvm.metadata" ||
|
|
GV->hasAvailableExternallyLinkage())
|
|
return true;
|
|
|
|
if (!GV->hasAppendingLinkage()) return false;
|
|
|
|
assert(GV->hasInitializer() && "Not a special LLVM global!");
|
|
|
|
const TargetData *TD = TM.getTargetData();
|
|
unsigned Align = Log2_32(TD->getPointerPrefAlignment());
|
|
if (GV->getName() == "llvm.global_ctors") {
|
|
OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
|
|
EmitAlignment(Align, 0);
|
|
EmitXXStructorList(GV->getInitializer());
|
|
|
|
if (TM.getRelocationModel() == Reloc::Static &&
|
|
MAI->hasStaticCtorDtorReferenceInStaticMode()) {
|
|
StringRef Sym(".constructors_used");
|
|
OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
|
|
MCSA_Reference);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
if (GV->getName() == "llvm.global_dtors") {
|
|
OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
|
|
EmitAlignment(Align, 0);
|
|
EmitXXStructorList(GV->getInitializer());
|
|
|
|
if (TM.getRelocationModel() == Reloc::Static &&
|
|
MAI->hasStaticCtorDtorReferenceInStaticMode()) {
|
|
StringRef Sym(".destructors_used");
|
|
OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
|
|
MCSA_Reference);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
|
|
/// global in the specified llvm.used list for which emitUsedDirectiveFor
|
|
/// is true, as being used with this directive.
|
|
void AsmPrinter::EmitLLVMUsedList(Constant *List) {
|
|
// Should be an array of 'i8*'.
|
|
ConstantArray *InitList = dyn_cast<ConstantArray>(List);
|
|
if (InitList == 0) return;
|
|
|
|
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
|
|
const GlobalValue *GV =
|
|
dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
|
|
if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
|
|
OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
|
|
MCSA_NoDeadStrip);
|
|
}
|
|
}
|
|
|
|
/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
|
|
/// function pointers, ignoring the init priority.
|
|
void AsmPrinter::EmitXXStructorList(Constant *List) {
|
|
// Should be an array of '{ int, void ()* }' structs. The first value is the
|
|
// init priority, which we ignore.
|
|
if (!isa<ConstantArray>(List)) return;
|
|
ConstantArray *InitList = cast<ConstantArray>(List);
|
|
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
|
|
if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
|
|
if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
|
|
|
|
if (CS->getOperand(1)->isNullValue())
|
|
return; // Found a null terminator, exit printing.
|
|
// Emit the function pointer.
|
|
EmitGlobalConstant(CS->getOperand(1));
|
|
}
|
|
}
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Emission and print routines
|
|
//
|
|
|
|
/// EmitInt8 - Emit a byte directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt8(int Value) const {
|
|
OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
|
|
}
|
|
|
|
/// EmitInt16 - Emit a short directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt16(int Value) const {
|
|
OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
|
|
}
|
|
|
|
/// EmitInt32 - Emit a long directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt32(int Value) const {
|
|
OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
|
|
}
|
|
|
|
/// EmitInt64 - Emit a long long directive and value.
|
|
///
|
|
void AsmPrinter::EmitInt64(uint64_t Value) const {
|
|
OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
|
|
}
|
|
|
|
/// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
|
|
/// in bytes of the directive is specified by Size and Hi/Lo specify the
|
|
/// labels. This implicitly uses .set if it is available.
|
|
void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
|
|
unsigned Size) const {
|
|
// Get the Hi-Lo expression.
|
|
const MCExpr *Diff =
|
|
MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
|
|
MCSymbolRefExpr::Create(Lo, OutContext),
|
|
OutContext);
|
|
|
|
if (!MAI->hasSetDirective()) {
|
|
OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, emit with .set (aka assignment).
|
|
MCSymbol *SetLabel =
|
|
OutContext.GetOrCreateTemporarySymbol(Twine(MAI->getPrivateGlobalPrefix()) +
|
|
"set" + Twine(SetCounter++));
|
|
OutStreamer.EmitAssignment(SetLabel, Diff);
|
|
OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// EmitAlignment - Emit an alignment directive to the specified power of
|
|
// two boundary. For example, if you pass in 3 here, you will get an 8
|
|
// byte alignment. If a global value is specified, and if that global has
|
|
// an explicit alignment requested, it will unconditionally override the
|
|
// alignment request. However, if ForcedAlignBits is specified, this value
|
|
// has final say: the ultimate alignment will be the max of ForcedAlignBits
|
|
// and the alignment computed with NumBits and the global.
|
|
//
|
|
// The algorithm is:
|
|
// Align = NumBits;
|
|
// if (GV && GV->hasalignment) Align = GV->getalignment();
|
|
// Align = std::max(Align, ForcedAlignBits);
|
|
//
|
|
void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
|
|
unsigned ForcedAlignBits,
|
|
bool UseFillExpr) const {
|
|
if (GV && GV->getAlignment())
|
|
NumBits = Log2_32(GV->getAlignment());
|
|
NumBits = std::max(NumBits, ForcedAlignBits);
|
|
|
|
if (NumBits == 0) return; // No need to emit alignment.
|
|
|
|
if (getCurrentSection()->getKind().isText())
|
|
OutStreamer.EmitCodeAlignment(1 << NumBits);
|
|
else
|
|
OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
|
|
}
|
|
|
|
/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
|
|
///
|
|
static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
|
|
MCContext &Ctx = AP.OutContext;
|
|
|
|
if (CV->isNullValue() || isa<UndefValue>(CV))
|
|
return MCConstantExpr::Create(0, Ctx);
|
|
|
|
if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
|
|
return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
|
|
|
|
if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
|
|
return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
|
|
if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
|
|
return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
|
|
|
|
const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
|
|
if (CE == 0) {
|
|
llvm_unreachable("Unknown constant value to lower!");
|
|
return MCConstantExpr::Create(0, Ctx);
|
|
}
|
|
|
|
switch (CE->getOpcode()) {
|
|
default:
|
|
// If the code isn't optimized, there may be outstanding folding
|
|
// opportunities. Attempt to fold the expression using TargetData as a
|
|
// last resort before giving up.
|
|
if (Constant *C =
|
|
ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
|
|
if (C != CE)
|
|
return LowerConstant(C, AP);
|
|
#ifndef NDEBUG
|
|
CE->dump();
|
|
#endif
|
|
llvm_unreachable("FIXME: Don't support this constant expr");
|
|
case Instruction::GetElementPtr: {
|
|
const TargetData &TD = *AP.TM.getTargetData();
|
|
// Generate a symbolic expression for the byte address
|
|
const Constant *PtrVal = CE->getOperand(0);
|
|
SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
|
|
int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
|
|
IdxVec.size());
|
|
|
|
const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
|
|
if (Offset == 0)
|
|
return Base;
|
|
|
|
// Truncate/sext the offset to the pointer size.
|
|
if (TD.getPointerSizeInBits() != 64) {
|
|
int SExtAmount = 64-TD.getPointerSizeInBits();
|
|
Offset = (Offset << SExtAmount) >> SExtAmount;
|
|
}
|
|
|
|
return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
|
|
Ctx);
|
|
}
|
|
|
|
case Instruction::Trunc:
|
|
// We emit the value and depend on the assembler to truncate the generated
|
|
// expression properly. This is important for differences between
|
|
// blockaddress labels. Since the two labels are in the same function, it
|
|
// is reasonable to treat their delta as a 32-bit value.
|
|
// FALL THROUGH.
|
|
case Instruction::BitCast:
|
|
return LowerConstant(CE->getOperand(0), AP);
|
|
|
|
case Instruction::IntToPtr: {
|
|
const TargetData &TD = *AP.TM.getTargetData();
|
|
// Handle casts to pointers by changing them into casts to the appropriate
|
|
// integer type. This promotes constant folding and simplifies this code.
|
|
Constant *Op = CE->getOperand(0);
|
|
Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
|
|
false/*ZExt*/);
|
|
return LowerConstant(Op, AP);
|
|
}
|
|
|
|
case Instruction::PtrToInt: {
|
|
const TargetData &TD = *AP.TM.getTargetData();
|
|
// Support only foldable casts to/from pointers that can be eliminated by
|
|
// changing the pointer to the appropriately sized integer type.
|
|
Constant *Op = CE->getOperand(0);
|
|
const Type *Ty = CE->getType();
|
|
|
|
const MCExpr *OpExpr = LowerConstant(Op, AP);
|
|
|
|
// We can emit the pointer value into this slot if the slot is an
|
|
// integer slot equal to the size of the pointer.
|
|
if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
|
|
return OpExpr;
|
|
|
|
// Otherwise the pointer is smaller than the resultant integer, mask off
|
|
// the high bits so we are sure to get a proper truncation if the input is
|
|
// a constant expr.
|
|
unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
|
|
const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
|
|
return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
|
|
}
|
|
|
|
// The MC library also has a right-shift operator, but it isn't consistently
|
|
// signed or unsigned between different targets.
|
|
case Instruction::Add:
|
|
case Instruction::Sub:
|
|
case Instruction::Mul:
|
|
case Instruction::SDiv:
|
|
case Instruction::SRem:
|
|
case Instruction::Shl:
|
|
case Instruction::And:
|
|
case Instruction::Or:
|
|
case Instruction::Xor: {
|
|
const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
|
|
const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
|
|
switch (CE->getOpcode()) {
|
|
default: llvm_unreachable("Unknown binary operator constant cast expr");
|
|
case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
|
|
case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
|
|
case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
|
|
case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
|
|
case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
|
|
case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
|
|
case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
|
|
case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
|
|
case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
|
|
AsmPrinter &AP) {
|
|
if (AddrSpace != 0 || !CA->isString()) {
|
|
// Not a string. Print the values in successive locations
|
|
for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
|
|
AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, it can be emitted as .ascii.
|
|
SmallVector<char, 128> TmpVec;
|
|
TmpVec.reserve(CA->getNumOperands());
|
|
for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
|
|
TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
|
|
|
|
AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
|
|
}
|
|
|
|
static void EmitGlobalConstantVector(const ConstantVector *CV,
|
|
unsigned AddrSpace, AsmPrinter &AP) {
|
|
for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
|
|
AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
|
|
}
|
|
|
|
static void EmitGlobalConstantStruct(const ConstantStruct *CS,
|
|
unsigned AddrSpace, AsmPrinter &AP) {
|
|
// Print the fields in successive locations. Pad to align if needed!
|
|
const TargetData *TD = AP.TM.getTargetData();
|
|
unsigned Size = TD->getTypeAllocSize(CS->getType());
|
|
const StructLayout *Layout = TD->getStructLayout(CS->getType());
|
|
uint64_t SizeSoFar = 0;
|
|
for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
|
|
const Constant *Field = CS->getOperand(i);
|
|
|
|
// Check if padding is needed and insert one or more 0s.
|
|
uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
|
|
uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
|
|
- Layout->getElementOffset(i)) - FieldSize;
|
|
SizeSoFar += FieldSize + PadSize;
|
|
|
|
// Now print the actual field value.
|
|
AP.EmitGlobalConstant(Field, AddrSpace);
|
|
|
|
// Insert padding - this may include padding to increase the size of the
|
|
// current field up to the ABI size (if the struct is not packed) as well
|
|
// as padding to ensure that the next field starts at the right offset.
|
|
AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
|
|
}
|
|
assert(SizeSoFar == Layout->getSizeInBytes() &&
|
|
"Layout of constant struct may be incorrect!");
|
|
}
|
|
|
|
static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
|
|
AsmPrinter &AP) {
|
|
// FP Constants are printed as integer constants to avoid losing
|
|
// precision.
|
|
if (CFP->getType()->isDoubleTy()) {
|
|
if (AP.VerboseAsm) {
|
|
double Val = CFP->getValueAPF().convertToDouble();
|
|
AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
|
|
}
|
|
|
|
uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
|
|
AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
|
|
return;
|
|
}
|
|
|
|
if (CFP->getType()->isFloatTy()) {
|
|
if (AP.VerboseAsm) {
|
|
float Val = CFP->getValueAPF().convertToFloat();
|
|
AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
|
|
}
|
|
uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
|
|
AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
|
|
return;
|
|
}
|
|
|
|
if (CFP->getType()->isX86_FP80Ty()) {
|
|
// all long double variants are printed as hex
|
|
// api needed to prevent premature destruction
|
|
APInt API = CFP->getValueAPF().bitcastToAPInt();
|
|
const uint64_t *p = API.getRawData();
|
|
if (AP.VerboseAsm) {
|
|
// Convert to double so we can print the approximate val as a comment.
|
|
APFloat DoubleVal = CFP->getValueAPF();
|
|
bool ignored;
|
|
DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
|
|
&ignored);
|
|
AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
|
|
<< DoubleVal.convertToDouble() << '\n';
|
|
}
|
|
|
|
if (AP.TM.getTargetData()->isBigEndian()) {
|
|
AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
|
|
AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
|
|
} else {
|
|
AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
|
|
AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
|
|
}
|
|
|
|
// Emit the tail padding for the long double.
|
|
const TargetData &TD = *AP.TM.getTargetData();
|
|
AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
|
|
TD.getTypeStoreSize(CFP->getType()), AddrSpace);
|
|
return;
|
|
}
|
|
|
|
assert(CFP->getType()->isPPC_FP128Ty() &&
|
|
"Floating point constant type not handled");
|
|
// All long double variants are printed as hex api needed to prevent
|
|
// premature destruction.
|
|
APInt API = CFP->getValueAPF().bitcastToAPInt();
|
|
const uint64_t *p = API.getRawData();
|
|
if (AP.TM.getTargetData()->isBigEndian()) {
|
|
AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
|
|
AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
|
|
} else {
|
|
AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
|
|
AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
|
|
}
|
|
}
|
|
|
|
static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
|
|
unsigned AddrSpace, AsmPrinter &AP) {
|
|
const TargetData *TD = AP.TM.getTargetData();
|
|
unsigned BitWidth = CI->getBitWidth();
|
|
assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
|
|
|
|
// We don't expect assemblers to support integer data directives
|
|
// for more than 64 bits, so we emit the data in at most 64-bit
|
|
// quantities at a time.
|
|
const uint64_t *RawData = CI->getValue().getRawData();
|
|
for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
|
|
uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
|
|
AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
|
|
}
|
|
}
|
|
|
|
/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
|
|
void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
|
|
if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
|
|
uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
|
|
if (Size == 0) Size = 1; // An empty "_foo:" followed by a section is undef.
|
|
return OutStreamer.EmitZeros(Size, AddrSpace);
|
|
}
|
|
|
|
if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
|
|
unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
|
|
switch (Size) {
|
|
case 1:
|
|
case 2:
|
|
case 4:
|
|
case 8:
|
|
if (VerboseAsm)
|
|
OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
|
|
OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
|
|
return;
|
|
default:
|
|
EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
|
|
return EmitGlobalConstantArray(CVA, AddrSpace, *this);
|
|
|
|
if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
|
|
return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
|
|
|
|
if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
|
|
return EmitGlobalConstantFP(CFP, AddrSpace, *this);
|
|
|
|
if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
|
|
return EmitGlobalConstantVector(V, AddrSpace, *this);
|
|
|
|
if (isa<ConstantPointerNull>(CV)) {
|
|
unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
|
|
OutStreamer.EmitIntValue(0, Size, AddrSpace);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
|
|
// thread the streamer with EmitValue.
|
|
OutStreamer.EmitValue(LowerConstant(CV, *this),
|
|
TM.getTargetData()->getTypeAllocSize(CV->getType()),
|
|
AddrSpace);
|
|
}
|
|
|
|
void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
|
|
// Target doesn't support this yet!
|
|
llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
|
|
}
|
|
|
|
/// PrintSpecial - Print information related to the specified machine instr
|
|
/// that is independent of the operand, and may be independent of the instr
|
|
/// itself. This can be useful for portably encoding the comment character
|
|
/// or other bits of target-specific knowledge into the asmstrings. The
|
|
/// syntax used is ${:comment}. Targets can override this to add support
|
|
/// for their own strange codes.
|
|
void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
|
|
if (!strcmp(Code, "private")) {
|
|
O << MAI->getPrivateGlobalPrefix();
|
|
} else if (!strcmp(Code, "comment")) {
|
|
if (VerboseAsm)
|
|
O << MAI->getCommentString();
|
|
} else if (!strcmp(Code, "uid")) {
|
|
// Comparing the address of MI isn't sufficient, because machineinstrs may
|
|
// be allocated to the same address across functions.
|
|
const Function *ThisF = MI->getParent()->getParent()->getFunction();
|
|
|
|
// If this is a new LastFn instruction, bump the counter.
|
|
if (LastMI != MI || LastFn != ThisF) {
|
|
++Counter;
|
|
LastMI = MI;
|
|
LastFn = ThisF;
|
|
}
|
|
O << Counter;
|
|
} else {
|
|
std::string msg;
|
|
raw_string_ostream Msg(msg);
|
|
Msg << "Unknown special formatter '" << Code
|
|
<< "' for machine instr: " << *MI;
|
|
llvm_report_error(Msg.str());
|
|
}
|
|
}
|
|
|
|
/// processDebugLoc - Processes the debug information of each machine
|
|
/// instruction's DebugLoc.
|
|
void AsmPrinter::processDebugLoc(const MachineInstr *MI,
|
|
bool BeforePrintingInsn) {
|
|
if (!MAI || !DW || !MAI->doesSupportDebugInformation()
|
|
|| !DW->ShouldEmitDwarfDebug())
|
|
return;
|
|
DebugLoc DL = MI->getDebugLoc();
|
|
if (DL.isUnknown())
|
|
return;
|
|
DILocation CurDLT = MF->getDILocation(DL);
|
|
if (!CurDLT.getScope().Verify())
|
|
return;
|
|
|
|
if (!BeforePrintingInsn) {
|
|
// After printing instruction
|
|
DW->EndScope(MI);
|
|
} else if (CurDLT.getNode() != PrevDLT) {
|
|
MCSymbol *L = DW->RecordSourceLine(CurDLT.getLineNumber(),
|
|
CurDLT.getColumnNumber(),
|
|
CurDLT.getScope().getNode());
|
|
DW->BeginScope(MI, L);
|
|
PrevDLT = CurDLT.getNode();
|
|
}
|
|
}
|
|
|
|
|
|
/// printInlineAsm - This method formats and prints the specified machine
|
|
/// instruction that is an inline asm.
|
|
void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
|
|
unsigned NumOperands = MI->getNumOperands();
|
|
|
|
// Count the number of register definitions.
|
|
unsigned NumDefs = 0;
|
|
for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
|
|
++NumDefs)
|
|
assert(NumDefs != NumOperands-1 && "No asm string?");
|
|
|
|
assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
|
|
|
|
// Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
|
|
const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
|
|
|
|
O << '\t';
|
|
|
|
// If this asmstr is empty, just print the #APP/#NOAPP markers.
|
|
// These are useful to see where empty asm's wound up.
|
|
if (AsmStr[0] == 0) {
|
|
O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
|
|
O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
|
|
return;
|
|
}
|
|
|
|
O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
|
|
|
|
// The variant of the current asmprinter.
|
|
int AsmPrinterVariant = MAI->getAssemblerDialect();
|
|
|
|
int CurVariant = -1; // The number of the {.|.|.} region we are in.
|
|
const char *LastEmitted = AsmStr; // One past the last character emitted.
|
|
|
|
while (*LastEmitted) {
|
|
switch (*LastEmitted) {
|
|
default: {
|
|
// Not a special case, emit the string section literally.
|
|
const char *LiteralEnd = LastEmitted+1;
|
|
while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
|
|
*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
|
|
++LiteralEnd;
|
|
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
|
|
O.write(LastEmitted, LiteralEnd-LastEmitted);
|
|
LastEmitted = LiteralEnd;
|
|
break;
|
|
}
|
|
case '\n':
|
|
++LastEmitted; // Consume newline character.
|
|
O << '\n'; // Indent code with newline.
|
|
break;
|
|
case '$': {
|
|
++LastEmitted; // Consume '$' character.
|
|
bool Done = true;
|
|
|
|
// Handle escapes.
|
|
switch (*LastEmitted) {
|
|
default: Done = false; break;
|
|
case '$': // $$ -> $
|
|
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
|
|
O << '$';
|
|
++LastEmitted; // Consume second '$' character.
|
|
break;
|
|
case '(': // $( -> same as GCC's { character.
|
|
++LastEmitted; // Consume '(' character.
|
|
if (CurVariant != -1) {
|
|
llvm_report_error("Nested variants found in inline asm string: '"
|
|
+ std::string(AsmStr) + "'");
|
|
}
|
|
CurVariant = 0; // We're in the first variant now.
|
|
break;
|
|
case '|':
|
|
++LastEmitted; // consume '|' character.
|
|
if (CurVariant == -1)
|
|
O << '|'; // this is gcc's behavior for | outside a variant
|
|
else
|
|
++CurVariant; // We're in the next variant.
|
|
break;
|
|
case ')': // $) -> same as GCC's } char.
|
|
++LastEmitted; // consume ')' character.
|
|
if (CurVariant == -1)
|
|
O << '}'; // this is gcc's behavior for } outside a variant
|
|
else
|
|
CurVariant = -1;
|
|
break;
|
|
}
|
|
if (Done) break;
|
|
|
|
bool HasCurlyBraces = false;
|
|
if (*LastEmitted == '{') { // ${variable}
|
|
++LastEmitted; // Consume '{' character.
|
|
HasCurlyBraces = true;
|
|
}
|
|
|
|
// If we have ${:foo}, then this is not a real operand reference, it is a
|
|
// "magic" string reference, just like in .td files. Arrange to call
|
|
// PrintSpecial.
|
|
if (HasCurlyBraces && *LastEmitted == ':') {
|
|
++LastEmitted;
|
|
const char *StrStart = LastEmitted;
|
|
const char *StrEnd = strchr(StrStart, '}');
|
|
if (StrEnd == 0) {
|
|
llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
|
|
+ std::string(AsmStr) + "'");
|
|
}
|
|
|
|
std::string Val(StrStart, StrEnd);
|
|
PrintSpecial(MI, Val.c_str());
|
|
LastEmitted = StrEnd+1;
|
|
break;
|
|
}
|
|
|
|
const char *IDStart = LastEmitted;
|
|
char *IDEnd;
|
|
errno = 0;
|
|
long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
|
|
if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
|
|
llvm_report_error("Bad $ operand number in inline asm string: '"
|
|
+ std::string(AsmStr) + "'");
|
|
}
|
|
LastEmitted = IDEnd;
|
|
|
|
char Modifier[2] = { 0, 0 };
|
|
|
|
if (HasCurlyBraces) {
|
|
// If we have curly braces, check for a modifier character. This
|
|
// supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
|
|
if (*LastEmitted == ':') {
|
|
++LastEmitted; // Consume ':' character.
|
|
if (*LastEmitted == 0) {
|
|
llvm_report_error("Bad ${:} expression in inline asm string: '"
|
|
+ std::string(AsmStr) + "'");
|
|
}
|
|
|
|
Modifier[0] = *LastEmitted;
|
|
++LastEmitted; // Consume modifier character.
|
|
}
|
|
|
|
if (*LastEmitted != '}') {
|
|
llvm_report_error("Bad ${} expression in inline asm string: '"
|
|
+ std::string(AsmStr) + "'");
|
|
}
|
|
++LastEmitted; // Consume '}' character.
|
|
}
|
|
|
|
if ((unsigned)Val >= NumOperands-1) {
|
|
llvm_report_error("Invalid $ operand number in inline asm string: '"
|
|
+ std::string(AsmStr) + "'");
|
|
}
|
|
|
|
// Okay, we finally have a value number. Ask the target to print this
|
|
// operand!
|
|
if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
|
|
unsigned OpNo = 1;
|
|
|
|
bool Error = false;
|
|
|
|
// Scan to find the machine operand number for the operand.
|
|
for (; Val; --Val) {
|
|
if (OpNo >= MI->getNumOperands()) break;
|
|
unsigned OpFlags = MI->getOperand(OpNo).getImm();
|
|
OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
|
|
}
|
|
|
|
if (OpNo >= MI->getNumOperands()) {
|
|
Error = true;
|
|
} else {
|
|
unsigned OpFlags = MI->getOperand(OpNo).getImm();
|
|
++OpNo; // Skip over the ID number.
|
|
|
|
if (Modifier[0] == 'l') // labels are target independent
|
|
O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
|
|
else {
|
|
AsmPrinter *AP = const_cast<AsmPrinter*>(this);
|
|
if ((OpFlags & 7) == 4) {
|
|
Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
|
|
Modifier[0] ? Modifier : 0);
|
|
} else {
|
|
Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
|
|
Modifier[0] ? Modifier : 0);
|
|
}
|
|
}
|
|
}
|
|
if (Error) {
|
|
std::string msg;
|
|
raw_string_ostream Msg(msg);
|
|
Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
|
|
MI->print(Msg);
|
|
llvm_report_error(Msg.str());
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
|
|
/// printImplicitDef - This method prints the specified machine instruction
|
|
/// that is an implicit def.
|
|
void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
|
|
if (!VerboseAsm) return;
|
|
O.PadToColumn(MAI->getCommentColumn());
|
|
O << MAI->getCommentString() << " implicit-def: "
|
|
<< TRI->getName(MI->getOperand(0).getReg());
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
|
|
void AsmPrinter::printKill(const MachineInstr *MI) const {
|
|
if (!VerboseAsm) return;
|
|
O.PadToColumn(MAI->getCommentColumn());
|
|
O << MAI->getCommentString() << " kill:";
|
|
for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
|
|
const MachineOperand &op = MI->getOperand(n);
|
|
assert(op.isReg() && "KILL instruction must have only register operands");
|
|
O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
|
|
}
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
|
|
/// printLabel - This method prints a local label used by debug and
|
|
/// exception handling tables.
|
|
void AsmPrinter::printLabelInst(const MachineInstr *MI) const {
|
|
MCSymbol *Sym =
|
|
OutContext.GetOrCreateTemporarySymbol(Twine(MAI->getPrivateGlobalPrefix()) +
|
|
"label" + Twine(MI->getOperand(0).getImm()));
|
|
OutStreamer.EmitLabel(Sym);
|
|
}
|
|
|
|
void AsmPrinter::printLabel(unsigned Id) const {
|
|
MCSymbol *Sym =
|
|
OutContext.GetOrCreateTemporarySymbol(Twine(MAI->getPrivateGlobalPrefix()) +
|
|
"label" + Twine(Id));
|
|
OutStreamer.EmitLabel(Sym);
|
|
}
|
|
|
|
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
|
|
/// instruction, using the specified assembler variant. Targets should
|
|
/// override this to format as appropriate.
|
|
bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
|
|
unsigned AsmVariant, const char *ExtraCode) {
|
|
// Target doesn't support this yet!
|
|
return true;
|
|
}
|
|
|
|
bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
|
|
unsigned AsmVariant,
|
|
const char *ExtraCode) {
|
|
// Target doesn't support this yet!
|
|
return true;
|
|
}
|
|
|
|
MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
|
|
return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock());
|
|
}
|
|
|
|
MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
|
|
const BasicBlock *BB) const {
|
|
assert(BB->hasName() &&
|
|
"Address of anonymous basic block not supported yet!");
|
|
|
|
// This code must use the function name itself, and not the function number,
|
|
// since it must be possible to generate the label name from within other
|
|
// functions.
|
|
SmallString<60> FnName;
|
|
Mang->getNameWithPrefix(FnName, F, false);
|
|
|
|
// FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
|
|
SmallString<60> NameResult;
|
|
Mang->getNameWithPrefix(NameResult,
|
|
StringRef("BA") + Twine((unsigned)FnName.size()) +
|
|
"_" + FnName.str() + "_" + BB->getName(),
|
|
Mangler::Private);
|
|
|
|
return OutContext.GetOrCreateTemporarySymbol(NameResult.str());
|
|
}
|
|
|
|
/// GetCPISymbol - Return the symbol for the specified constant pool entry.
|
|
MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
|
|
return OutContext.GetOrCreateTemporarySymbol
|
|
(Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
|
|
+ "_" + Twine(CPID));
|
|
}
|
|
|
|
/// GetJTISymbol - Return the symbol for the specified jump table entry.
|
|
MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
|
|
return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
|
|
}
|
|
|
|
/// GetJTSetSymbol - Return the symbol for the specified jump table .set
|
|
/// FIXME: privatize to AsmPrinter.
|
|
MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
|
|
return OutContext.GetOrCreateTemporarySymbol
|
|
(Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
|
|
Twine(UID) + "_set_" + Twine(MBBID));
|
|
}
|
|
|
|
/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
|
|
/// value.
|
|
MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
|
|
SmallString<60> NameStr;
|
|
Mang->getNameWithPrefix(NameStr, GV, false);
|
|
|
|
if (!GV->hasPrivateLinkage())
|
|
return OutContext.GetOrCreateSymbol(NameStr.str());
|
|
return OutContext.GetOrCreateTemporarySymbol(NameStr.str());
|
|
}
|
|
|
|
/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
|
|
/// global value name as its base, with the specified suffix, and where the
|
|
/// symbol is forced to have private linkage if ForcePrivate is true.
|
|
MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
|
|
StringRef Suffix,
|
|
bool ForcePrivate) const {
|
|
SmallString<60> NameStr;
|
|
Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
|
|
NameStr.append(Suffix.begin(), Suffix.end());
|
|
if (!GV->hasPrivateLinkage() && !ForcePrivate)
|
|
return OutContext.GetOrCreateSymbol(NameStr.str());
|
|
return OutContext.GetOrCreateTemporarySymbol(NameStr.str());
|
|
}
|
|
|
|
/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
|
|
/// ExternalSymbol.
|
|
MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
|
|
SmallString<60> NameStr;
|
|
Mang->getNameWithPrefix(NameStr, Sym);
|
|
return OutContext.GetOrCreateSymbol(NameStr.str());
|
|
}
|
|
|
|
|
|
|
|
/// PrintParentLoopComment - Print comments about parent loops of this one.
|
|
static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
|
|
unsigned FunctionNumber) {
|
|
if (Loop == 0) return;
|
|
PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
|
|
OS.indent(Loop->getLoopDepth()*2)
|
|
<< "Parent Loop BB" << FunctionNumber << "_"
|
|
<< Loop->getHeader()->getNumber()
|
|
<< " Depth=" << Loop->getLoopDepth() << '\n';
|
|
}
|
|
|
|
|
|
/// PrintChildLoopComment - Print comments about child loops within
|
|
/// the loop for this basic block, with nesting.
|
|
static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
|
|
unsigned FunctionNumber) {
|
|
// Add child loop information
|
|
for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
|
|
OS.indent((*CL)->getLoopDepth()*2)
|
|
<< "Child Loop BB" << FunctionNumber << "_"
|
|
<< (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
|
|
<< '\n';
|
|
PrintChildLoopComment(OS, *CL, FunctionNumber);
|
|
}
|
|
}
|
|
|
|
/// PrintBasicBlockLoopComments - Pretty-print comments for basic blocks.
|
|
static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
|
|
const MachineLoopInfo *LI,
|
|
const AsmPrinter &AP) {
|
|
// Add loop depth information
|
|
const MachineLoop *Loop = LI->getLoopFor(&MBB);
|
|
if (Loop == 0) return;
|
|
|
|
MachineBasicBlock *Header = Loop->getHeader();
|
|
assert(Header && "No header for loop");
|
|
|
|
// If this block is not a loop header, just print out what is the loop header
|
|
// and return.
|
|
if (Header != &MBB) {
|
|
AP.OutStreamer.AddComment(" in Loop: Header=BB" +
|
|
Twine(AP.getFunctionNumber())+"_" +
|
|
Twine(Loop->getHeader()->getNumber())+
|
|
" Depth="+Twine(Loop->getLoopDepth()));
|
|
return;
|
|
}
|
|
|
|
// Otherwise, it is a loop header. Print out information about child and
|
|
// parent loops.
|
|
raw_ostream &OS = AP.OutStreamer.GetCommentOS();
|
|
|
|
PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
|
|
|
|
OS << "=>";
|
|
OS.indent(Loop->getLoopDepth()*2-2);
|
|
|
|
OS << "This ";
|
|
if (Loop->empty())
|
|
OS << "Inner ";
|
|
OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
|
|
|
|
PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
|
|
}
|
|
|
|
|
|
/// EmitBasicBlockStart - This method prints the label for the specified
|
|
/// MachineBasicBlock, an alignment (if present) and a comment describing
|
|
/// it if appropriate.
|
|
void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
|
|
// Emit an alignment directive for this block, if needed.
|
|
if (unsigned Align = MBB->getAlignment())
|
|
EmitAlignment(Log2_32(Align));
|
|
|
|
// If the block has its address taken, emit a special label to satisfy
|
|
// references to the block. This is done so that we don't need to
|
|
// remember the number of this label, and so that we can make
|
|
// forward references to labels without knowing what their numbers
|
|
// will be.
|
|
if (MBB->hasAddressTaken()) {
|
|
const BasicBlock *BB = MBB->getBasicBlock();
|
|
if (VerboseAsm)
|
|
OutStreamer.AddComment("Address Taken");
|
|
OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
|
|
}
|
|
|
|
// Print the main label for the block.
|
|
if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
|
|
if (VerboseAsm) {
|
|
// NOTE: Want this comment at start of line.
|
|
O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
|
|
if (const BasicBlock *BB = MBB->getBasicBlock())
|
|
if (BB->hasName())
|
|
OutStreamer.AddComment("%" + BB->getName());
|
|
|
|
PrintBasicBlockLoopComments(*MBB, LI, *this);
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
} else {
|
|
if (VerboseAsm) {
|
|
if (const BasicBlock *BB = MBB->getBasicBlock())
|
|
if (BB->hasName())
|
|
OutStreamer.AddComment("%" + BB->getName());
|
|
PrintBasicBlockLoopComments(*MBB, LI, *this);
|
|
}
|
|
|
|
OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
|
|
}
|
|
}
|
|
|
|
void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
|
|
MCSymbolAttr Attr = MCSA_Invalid;
|
|
|
|
switch (Visibility) {
|
|
default: break;
|
|
case GlobalValue::HiddenVisibility:
|
|
Attr = MAI->getHiddenVisibilityAttr();
|
|
break;
|
|
case GlobalValue::ProtectedVisibility:
|
|
Attr = MAI->getProtectedVisibilityAttr();
|
|
break;
|
|
}
|
|
|
|
if (Attr != MCSA_Invalid)
|
|
OutStreamer.EmitSymbolAttribute(Sym, Attr);
|
|
}
|
|
|
|
void AsmPrinter::printOffset(int64_t Offset) const {
|
|
if (Offset > 0)
|
|
O << '+' << Offset;
|
|
else if (Offset < 0)
|
|
O << Offset;
|
|
}
|
|
|
|
/// isBlockOnlyReachableByFallthough - Return true if the basic block has
|
|
/// exactly one predecessor and the control transfer mechanism between
|
|
/// the predecessor and this block is a fall-through.
|
|
bool AsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB)
|
|
const {
|
|
// If this is a landing pad, it isn't a fall through. If it has no preds,
|
|
// then nothing falls through to it.
|
|
if (MBB->isLandingPad() || MBB->pred_empty())
|
|
return false;
|
|
|
|
// If there isn't exactly one predecessor, it can't be a fall through.
|
|
MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
|
|
++PI2;
|
|
if (PI2 != MBB->pred_end())
|
|
return false;
|
|
|
|
// The predecessor has to be immediately before this block.
|
|
const MachineBasicBlock *Pred = *PI;
|
|
|
|
if (!Pred->isLayoutSuccessor(MBB))
|
|
return false;
|
|
|
|
// If the block is completely empty, then it definitely does fall through.
|
|
if (Pred->empty())
|
|
return true;
|
|
|
|
// Otherwise, check the last instruction.
|
|
const MachineInstr &LastInst = Pred->back();
|
|
return !LastInst.getDesc().isBarrier();
|
|
}
|
|
|
|
|
|
|
|
GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
|
|
if (!S->usesMetadata())
|
|
return 0;
|
|
|
|
gcp_iterator GCPI = GCMetadataPrinters.find(S);
|
|
if (GCPI != GCMetadataPrinters.end())
|
|
return GCPI->second;
|
|
|
|
const char *Name = S->getName().c_str();
|
|
|
|
for (GCMetadataPrinterRegistry::iterator
|
|
I = GCMetadataPrinterRegistry::begin(),
|
|
E = GCMetadataPrinterRegistry::end(); I != E; ++I)
|
|
if (strcmp(Name, I->getName()) == 0) {
|
|
GCMetadataPrinter *GMP = I->instantiate();
|
|
GMP->S = S;
|
|
GCMetadataPrinters.insert(std::make_pair(S, GMP));
|
|
return GMP;
|
|
}
|
|
|
|
llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
|
|
return 0;
|
|
}
|
|
|