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91bead7905
llvm-6502/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Chris Lattner 91bead7905 add a new EmitInlineAsm function to asmprinter to handle inline asm. 
If we have an MCAsmStreamer, we continue to emit asm textually, 
otherwise we (currently) emit an error to errs and ignore it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100289 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03 21:35:55 +00:00

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//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the AsmPrinter class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/GCMetadataPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include <cerrno>
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
char AsmPrinter::ID = 0;
AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
MCStreamer &Streamer)
: MachineFunctionPass(&ID), O(o),
TM(tm), MAI(tm.getMCAsmInfo()), TRI(tm.getRegisterInfo()),
OutContext(Streamer.getContext()),
OutStreamer(Streamer),
LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
DW = 0; MMI = 0;
VerboseAsm = Streamer.isVerboseAsm();
}
AsmPrinter::~AsmPrinter() {
for (gcp_iterator I = GCMetadataPrinters.begin(),
E = GCMetadataPrinters.end(); I != E; ++I)
delete I->second;
delete &OutStreamer;
}
/// getFunctionNumber - Return a unique ID for the current function.
///
unsigned AsmPrinter::getFunctionNumber() const {
return MF->getFunctionNumber();
}
TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
return TM.getTargetLowering()->getObjFileLowering();
}
/// getCurrentSection() - Return the current section we are emitting to.
const MCSection *AsmPrinter::getCurrentSection() const {
return OutStreamer.getCurrentSection();
}
void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
AU.addRequired<MachineModuleInfo>();
AU.addRequired<GCModuleInfo>();
if (VerboseAsm)
AU.addRequired<MachineLoopInfo>();
}
bool AsmPrinter::doInitialization(Module &M) {
MMI = getAnalysisIfAvailable<MachineModuleInfo>();
MMI->AnalyzeModule(M);
// Initialize TargetLoweringObjectFile.
const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
.Initialize(OutContext, TM);
Mang = new Mangler(OutContext, *TM.getTargetData());
// Allow the target to emit any magic that it wants at the start of the file.
EmitStartOfAsmFile(M);
// Very minimal debug info. It is ignored if we emit actual debug info. If we
// don't, this at least helps the user find where a global came from.
if (MAI->hasSingleParameterDotFile()) {
// .file "foo.c"
OutStreamer.EmitFileDirective(M.getModuleIdentifier());
}
GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
assert(MI && "AsmPrinter didn't require GCModuleInfo?");
for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
MP->beginAssembly(O, *this, *MAI);
// Emit module-level inline asm if it exists.
if (!M.getModuleInlineAsm().empty()) {
OutStreamer.AddComment("Start of file scope inline assembly");
OutStreamer.AddBlankLine();
EmitInlineAsm(M.getModuleInlineAsm());
OutStreamer.AddComment("End of file scope inline assembly");
OutStreamer.AddBlankLine();
}
DW = getAnalysisIfAvailable<DwarfWriter>();
if (DW)
DW->BeginModule(&M, MMI, O, this, MAI);
return false;
}
void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
switch ((GlobalValue::LinkageTypes)Linkage) {
case GlobalValue::CommonLinkage:
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::LinkerPrivateLinkage:
if (MAI->getWeakDefDirective() != 0) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
// .weak_definition _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
} else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
// FIXME: linkonce should be a section attribute, handled by COFF Section
// assignment.
// http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
// .linkonce discard
// FIXME: It would be nice to use .linkonce samesize for non-common
// globals.
O << LinkOnce;
} else {
// .weak _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
}
break;
case GlobalValue::DLLExportLinkage:
case GlobalValue::AppendingLinkage:
// FIXME: appending linkage variables should go into a section of
// their name or something. For now, just emit them as external.
case GlobalValue::ExternalLinkage:
// If external or appending, declare as a global symbol.
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
break;
case GlobalValue::PrivateLinkage:
case GlobalValue::InternalLinkage:
break;
default:
llvm_unreachable("Unknown linkage type!");
}
}
/// EmitGlobalVariable - Emit the specified global variable to the .s file.
void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
if (!GV->hasInitializer()) // External globals require no code.
return;
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(GV))
return;
MCSymbol *GVSym = Mang->getSymbol(GV);
EmitVisibility(GVSym, GV->getVisibility());
if (MAI->hasDotTypeDotSizeDirective())
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
const TargetData *TD = TM.getTargetData();
unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
// Handle common and BSS local symbols (.lcomm).
if (GVKind.isCommon() || GVKind.isBSSLocal()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
if (VerboseAsm) {
WriteAsOperand(OutStreamer.GetCommentOS(), GV,
/*PrintType=*/false, GV->getParent());
OutStreamer.GetCommentOS() << '\n';
}
// Handle common symbols.
if (GVKind.isCommon()) {
// .comm _foo, 42, 4
OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
return;
}
// Handle local BSS symbols.
if (MAI->hasMachoZeroFillDirective()) {
const MCSection *TheSection =
getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
// .zerofill __DATA, __bss, _foo, 400, 5
OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
return;
}
if (MAI->hasLCOMMDirective()) {
// .lcomm _foo, 42
OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
return;
}
// .local _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
// .comm _foo, 42, 4
OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
return;
}
const MCSection *TheSection =
getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
// .zerofill __DATA, __common, _foo, 400, 5
OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
return;
}
OutStreamer.SwitchSection(TheSection);
EmitLinkage(GV->getLinkage(), GVSym);
EmitAlignment(AlignLog, GV);
if (VerboseAsm) {
WriteAsOperand(OutStreamer.GetCommentOS(), GV,
/*PrintType=*/false, GV->getParent());
OutStreamer.GetCommentOS() << '\n';
}
OutStreamer.EmitLabel(GVSym);
EmitGlobalConstant(GV->getInitializer());
if (MAI->hasDotTypeDotSizeDirective())
// .size foo, 42
OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
OutStreamer.AddBlankLine();
}
/// EmitFunctionHeader - This method emits the header for the current
/// function.
void AsmPrinter::EmitFunctionHeader() {
// Print out constants referenced by the function
EmitConstantPool();
// Print the 'header' of function.
const Function *F = MF->getFunction();
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
EmitVisibility(CurrentFnSym, F->getVisibility());
EmitLinkage(F->getLinkage(), CurrentFnSym);
EmitAlignment(MF->getAlignment(), F);
if (MAI->hasDotTypeDotSizeDirective())
OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
if (VerboseAsm) {
WriteAsOperand(OutStreamer.GetCommentOS(), F,
/*PrintType=*/false, F->getParent());
OutStreamer.GetCommentOS() << '\n';
}
// Emit the CurrentFnSym. This is a virtual function to allow targets to
// do their wild and crazy things as required.
EmitFunctionEntryLabel();
// If the function had address-taken blocks that got deleted, then we have
// references to the dangling symbols. Emit them at the start of the function
// so that we don't get references to undefined symbols.
std::vector<MCSymbol*> DeadBlockSyms;
MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
OutStreamer.AddComment("Address taken block that was later removed");
OutStreamer.EmitLabel(DeadBlockSyms[i]);
}
// Add some workaround for linkonce linkage on Cygwin\MinGW.
if (MAI->getLinkOnceDirective() != 0 &&
(F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
// FIXME: What is this?
O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
// Emit pre-function debug and/or EH information.
if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
DW->BeginFunction(MF);
}
/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
/// function. This can be overridden by targets as required to do custom stuff.
void AsmPrinter::EmitFunctionEntryLabel() {
OutStreamer.EmitLabel(CurrentFnSym);
}
/// EmitComments - Pretty-print comments for instructions.
static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
const MachineFunction *MF = MI.getParent()->getParent();
const TargetMachine &TM = MF->getTarget();
DebugLoc DL = MI.getDebugLoc();
if (!DL.isUnknown()) { // Print source line info.
DIScope Scope(DL.getScope(MF->getFunction()->getContext()));
// Omit the directory, because it's likely to be long and uninteresting.
if (Scope.Verify())
CommentOS << Scope.getFilename();
else
CommentOS << "<unknown>";
CommentOS << ':' << DL.getLine();
if (DL.getCol() != 0)
CommentOS << ':' << DL.getCol();
CommentOS << '\n';
}
// Check for spills and reloads
int FI;
const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
// We assume a single instruction only has a spill or reload, not
// both.
const MachineMemOperand *MMO;
if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
if (FrameInfo->isSpillSlotObjectIndex(FI)) {
MMO = *MI.memoperands_begin();
CommentOS << MMO->getSize() << "-byte Reload\n";
}
} else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
if (FrameInfo->isSpillSlotObjectIndex(FI))
CommentOS << MMO->getSize() << "-byte Folded Reload\n";
} else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
if (FrameInfo->isSpillSlotObjectIndex(FI)) {
MMO = *MI.memoperands_begin();
CommentOS << MMO->getSize() << "-byte Spill\n";
}
} else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
if (FrameInfo->isSpillSlotObjectIndex(FI))
CommentOS << MMO->getSize() << "-byte Folded Spill\n";
}
// Check for spill-induced copies
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
SrcSubIdx, DstSubIdx)) {
if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
CommentOS << " Reload Reuse\n";
}
}
/// EmitFunctionBody - This method emits the body and trailer for a
/// function.
void AsmPrinter::EmitFunctionBody() {
// Emit target-specific gunk before the function body.
EmitFunctionBodyStart();
// Print out code for the function.
bool HasAnyRealCode = false;
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
I != E; ++I) {
// Print a label for the basic block.
EmitBasicBlockStart(I);
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
II != IE; ++II) {
// Print the assembly for the instruction.
if (!II->isLabel())
HasAnyRealCode = true;
++EmittedInsts;
// FIXME: Clean up processDebugLoc.
processDebugLoc(II, true);
if (VerboseAsm)
EmitComments(*II, OutStreamer.GetCommentOS());
switch (II->getOpcode()) {
case TargetOpcode::DBG_LABEL:
case TargetOpcode::EH_LABEL:
case TargetOpcode::GC_LABEL:
printLabelInst(II);
break;
case TargetOpcode::INLINEASM:
printInlineAsm(II);
break;
case TargetOpcode::IMPLICIT_DEF:
printImplicitDef(II);
break;
case TargetOpcode::KILL:
printKill(II);
break;
default:
EmitInstruction(II);
break;
}
// FIXME: Clean up processDebugLoc.
processDebugLoc(II, false);
}
}
// If the function is empty and the object file uses .subsections_via_symbols,
// then we need to emit *something* to the function body to prevent the
// labels from collapsing together. Just emit a 0 byte.
if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
// Emit target-specific gunk after the function body.
EmitFunctionBodyEnd();
if (MAI->hasDotTypeDotSizeDirective())
O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
// Emit post-function debug information.
if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
DW->EndFunction(MF);
// Print out jump tables referenced by the function.
EmitJumpTableInfo();
OutStreamer.AddBlankLine();
}
bool AsmPrinter::doFinalization(Module &M) {
// Emit global variables.
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
EmitGlobalVariable(I);
// Emit final debug information.
if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
DW->EndModule();
// If the target wants to know about weak references, print them all.
if (MAI->getWeakRefDirective()) {
// FIXME: This is not lazy, it would be nice to only print weak references
// to stuff that is actually used. Note that doing so would require targets
// to notice uses in operands (due to constant exprs etc). This should
// happen with the MC stuff eventually.
// Print out module-level global variables here.
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (!I->hasExternalWeakLinkage()) continue;
OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
}
for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
if (!I->hasExternalWeakLinkage()) continue;
OutStreamer.EmitSymbolAttribute(Mang->getSymbol(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 = Mang->getSymbol(I);
const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
MCSymbol *Target = Mang->getSymbol(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 = Mang->getSymbol(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;
if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) 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);
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_Inline:
llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
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);
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();
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);
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(Mang->getSymbol(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));
}
}
/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
void AsmPrinter::EmitInlineAsm(StringRef Str) {
assert(!Str.empty() && "Can't emit empty inline asm block");
// If the output streamer is actually a .s file, just emit the blob textually.
// This is useful in case the asm parser doesn't handle something but the
// system assembler does.
if (OutStreamer.hasRawTextSupport()) {
OutStreamer.EmitRawText(Str);
return;
}
errs() << "Inline asm not supported by this streamer!\n";
}
//===--------------------------------------------------------------------===//
// 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.GetOrCreateSymbol(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.Mang->getSymbol(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 EmitGlobalConstantUnion(const ConstantUnion *CU,
unsigned AddrSpace, AsmPrinter &AP) {
const TargetData *TD = AP.TM.getTargetData();
unsigned Size = TD->getTypeAllocSize(CU->getType());
const Constant *Contents = CU->getOperand(0);
unsigned FilledSize = TD->getTypeAllocSize(Contents->getType());
// Print the actually filled part
AP.EmitGlobalConstant(Contents, AddrSpace);
// And pad with enough zeroes
AP.OutStreamer.EmitZeros(Size-FilledSize, AddrSpace);
}
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 (isa<ConstantPointerNull>(CV)) {
unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
OutStreamer.EmitIntValue(0, Size, AddrSpace);
return;
}
if (const ConstantUnion *CVU = dyn_cast<ConstantUnion>(CV))
return EmitGlobalConstantUnion(CVU, AddrSpace, *this);
if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
return EmitGlobalConstantVector(V, AddrSpace, *this);
// 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;
if (!BeforePrintingInsn)
// After printing instruction
DW->EndScope(MI);
else
DW->BeginScope(MI);
}
/// 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();
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 {
OutStreamer.EmitLabel(MI->getOperand(0).getMCSymbol());
}
/// 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 MMI->getAddrLabelSymbol(BA->getBasicBlock());
}
MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
return MMI->getAddrLabelSymbol(BB);
}
/// GetCPISymbol - Return the symbol for the specified constant pool entry.
MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
return OutContext.GetOrCreateSymbol
(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.GetOrCreateSymbol
(Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
Twine(UID) + "_set_" + Twine(MBBID));
}
/// 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());
return OutContext.GetOrCreateSymbol(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 any labels that were used to
// reference the block. It is possible that there is more than one label
// here, because multiple LLVM BB's may have been RAUW'd to this block after
// the references were generated.
if (MBB->hasAddressTaken()) {
const BasicBlock *BB = MBB->getBasicBlock();
if (VerboseAsm)
OutStreamer.AddComment("Block address taken");
std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
for (unsigned i = 0, e = Syms.size(); i != e; ++i)
OutStreamer.EmitLabel(Syms[i]);
}
// 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());
}
}
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;
}
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