index e7410d6efa4c38619a7b662541e9b87d7cf235c1..548ef97962de88c35e58006cd95b93af331d6378 100644 (file)
return false;
}
+static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
+ GlobalValue::LinkageTypes Linkage = GV->getLinkage();
+ if (Linkage != GlobalValue::LinkOnceODRLinkage)
+ return false;
+
+ if (!MAI.hasWeakDefCanBeHiddenDirective())
+ return false;
+
+ if (GV->hasUnnamedAddr())
+ return true;
+
+ // This is only used for MachO, so right now it doesn't really matter how
+ // we handle alias. Revisit this once the MachO linker implements aliases.
+ if (isa<GlobalAlias>(GV))
+ return false;
+
+ // If it is a non constant variable, it needs to be uniqued across shared
+ // objects.
+ if (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
+ if (!Var->isConstant())
+ return false;
+ }
+
+ GlobalStatus GS;
+ if (!GlobalStatus::analyzeGlobal(GV, GS) && !GS.IsCompared)
+ return true;
+
+ return false;
+}
+
void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
GlobalValue::LinkageTypes Linkage = GV->getLinkage();
switch (Linkage) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
- bool CanBeHidden = false;
-
- if (Linkage == GlobalValue::LinkOnceODRLinkage &&
- MAI->hasWeakDefCanBeHiddenDirective()) {
- if (GV->hasUnnamedAddr()) {
- CanBeHidden = true;
- } else {
- GlobalStatus GS;
- if (!GlobalStatus::analyzeGlobal(GV, GS) && !GS.IsCompared)
- CanBeHidden = true;
- }
- }
-
- if (!CanBeHidden)
+ if (!canBeHidden(GV, *MAI))
// .weak_definition _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
else
llvm_unreachable("Unknown linkage type!");
}
+void AsmPrinter::getNameWithPrefix(SmallVectorImpl<char> &Name,
+ const GlobalValue *GV) const {
+ TM.getNameWithPrefix(Name, GV, *Mang);
+}
+
MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
- return getObjFileLowering().getSymbol(*Mang, GV);
+ return TM.getSymbol(GV, *Mang);
}
/// EmitGlobalVariable - Emit the specified global variable to the .s file.
// Handle local BSS symbols.
if (MAI->hasMachoZeroFillDirective()) {
const MCSection *TheSection =
- getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
+ getObjFileLowering().SectionForGlobal(GV, GVKind, *Mang, TM);
// .zerofill __DATA, __bss, _foo, 400, 5
OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
return;
}
const MCSection *TheSection =
- getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
+ getObjFileLowering().SectionForGlobal(GV, GVKind, *Mang, TM);
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
// Print the 'header' of function.
const Function *F = MF->getFunction();
- OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
+ OutStreamer.SwitchSection(
+ getObjFileLowering().SectionForGlobal(F, *Mang, TM));
EmitVisibility(CurrentFnSym, F->getVisibility());
EmitLinkage(F, CurrentFnSym);
void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
const MCSymbol *Label = MI.getOperand(0).getMCSymbol();
- if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
+ ExceptionHandling::ExceptionsType ExceptionHandlingType =
+ MAI->getExceptionHandlingType();
+ if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
+ ExceptionHandlingType != ExceptionHandling::ARM)
return;
if (needsCFIMoves() == CFI_M_None)
if (isVerbose()) emitKill(II, *this);
break;
default:
- if (!TM.hasMCUseLoc())
- MCLineEntry::Make(&OutStreamer, getCurrentSection());
-
EmitInstruction(II);
break;
}
OutStreamer.AddBlankLine();
}
+/// Emit a dwarf register operation.
+static void emitDwarfRegOp(const AsmPrinter &AP, int Reg) {
+ assert(Reg >= 0);
+ if (Reg < 32) {
+ AP.OutStreamer.AddComment(dwarf::
+ OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
+ AP.EmitInt8(dwarf::DW_OP_reg0 + Reg);
+ } else {
+ AP.OutStreamer.AddComment("DW_OP_regx");
+ AP.EmitInt8(dwarf::DW_OP_regx);
+ AP.OutStreamer.AddComment(Twine(Reg));
+ AP.EmitULEB128(Reg);
+ }
+}
+
+/// Emit an (double-)indirect dwarf register operation.
+static void emitDwarfRegOpIndirect(const AsmPrinter &AP,
+ int Reg, int Offset, bool Deref) {
+ assert(Reg >= 0);
+ if (Reg < 32) {
+ AP.OutStreamer.AddComment(dwarf::
+ OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
+ AP.EmitInt8(dwarf::DW_OP_breg0 + Reg);
+ } else {
+ AP.OutStreamer.AddComment("DW_OP_bregx");
+ AP.EmitInt8(dwarf::DW_OP_bregx);
+ AP.OutStreamer.AddComment(Twine(Reg));
+ AP.EmitULEB128(Reg);
+ }
+ AP.EmitSLEB128(Offset);
+ if (Deref)
+ AP.EmitInt8(dwarf::DW_OP_deref);
+}
+
+/// Emit a dwarf register operation for describing
+/// - a small value occupying only part of a register or
+/// - a small register representing only part of a value.
+static void emitDwarfRegOpPiece(const AsmPrinter &AP,
+ int Reg, unsigned Size, unsigned Offset) {
+ assert(Reg >= 0);
+ assert(Size > 0);
+
+ emitDwarfRegOp(AP, Reg);
+ // Emit Mask
+ if (Offset > 0) {
+ AP.OutStreamer.AddComment("DW_OP_bit_piece");
+ AP.EmitInt8(dwarf::DW_OP_bit_piece);
+ AP.OutStreamer.AddComment(Twine(Size));
+ AP.EmitULEB128(Size);
+ AP.OutStreamer.AddComment(Twine(Offset));
+ AP.EmitULEB128(Offset);
+ } else {
+ AP.OutStreamer.AddComment("DW_OP_piece");
+ AP.EmitInt8(dwarf::DW_OP_piece);
+ unsigned ByteSize = Size / 8; // Assuming 8 bits per byte.
+ AP.OutStreamer.AddComment(Twine(ByteSize));
+ AP.EmitULEB128(ByteSize);
+ }
+}
+
/// EmitDwarfRegOp - Emit dwarf register operation.
void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc,
bool Indirect) const {
const TargetRegisterInfo *TRI = TM.getRegisterInfo();
int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
- for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid() && Reg < 0;
- ++SR) {
- Reg = TRI->getDwarfRegNum(*SR, false);
- // FIXME: Get the bit range this register uses of the superregister
- // so that we can produce a DW_OP_bit_piece
- }
+ if (Reg < 0) {
+ // Walk up the super-register chain until we find a valid number.
+ for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid(); ++SR) {
+ Reg = TRI->getDwarfRegNum(*SR, false);
+ if (Reg >= 0) {
+ unsigned Idx = TRI->getSubRegIndex(*SR, MLoc.getReg());
+ unsigned Size = TRI->getSubRegIdxSize(Idx);
+ unsigned Offset = TRI->getSubRegIdxOffset(Idx);
+ emitDwarfRegOpPiece(*this, Reg, Size, Offset);
- // FIXME: Handle cases like a super register being encoded as
- // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
+ if (MLoc.isIndirect())
+ EmitInt8(dwarf::DW_OP_deref);
- // FIXME: We have no reasonable way of handling errors in here. The
- // caller might be in the middle of an dwarf expression. We should
- // probably assert that Reg >= 0 once debug info generation is more mature.
+ if (Indirect)
+ EmitInt8(dwarf::DW_OP_deref);
+
+ return;
+ }
+
+ // FIXME: Handle cases like a super register being encoded as
+ // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
- if (MLoc.isIndirect() || Indirect) {
- if (Reg < 32) {
- OutStreamer.AddComment(
- dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
- EmitInt8(dwarf::DW_OP_breg0 + Reg);
- } else {
- OutStreamer.AddComment("DW_OP_bregx");
- EmitInt8(dwarf::DW_OP_bregx);
- OutStreamer.AddComment(Twine(Reg));
- EmitULEB128(Reg);
- }
- EmitSLEB128(!MLoc.isIndirect() ? 0 : MLoc.getOffset());
- if (MLoc.isIndirect() && Indirect)
- EmitInt8(dwarf::DW_OP_deref);
- } else {
- if (Reg < 32) {
- OutStreamer.AddComment(
- dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
- EmitInt8(dwarf::DW_OP_reg0 + Reg);
- } else {
- OutStreamer.AddComment("DW_OP_regx");
- EmitInt8(dwarf::DW_OP_regx);
- OutStreamer.AddComment(Twine(Reg));
- EmitULEB128(Reg);
}
+ // FIXME: We have no reasonable way of handling errors in here. The
+ // caller might be in the middle of an dwarf expression. We should
+ // probably assert that Reg >= 0 once debug info generation is more mature.
+ OutStreamer.AddComment("nop (invalid dwarf register number)");
+ EmitInt8(dwarf::DW_OP_nop);
+ return;
}
- // FIXME: Produce a DW_OP_bit_piece if we used a superregister
+ if (MLoc.isIndirect())
+ emitDwarfRegOpIndirect(*this, Reg, MLoc.getOffset(), Indirect);
+ else if (Indirect)
+ emitDwarfRegOpIndirect(*this, Reg, 0, false);
+ else
+ emitDwarfRegOp(*this, Reg);
}
bool AsmPrinter::doFinalization(Module &M) {
SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
M.getModuleFlagsMetadata(ModuleFlags);
if (!ModuleFlags.empty())
- getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM);
+ getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, *Mang, TM);
// Make sure we wrote out everything we need.
OutStreamer.Flush();
// 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));
+ OutStreamer.SwitchSection(
+ getObjFileLowering().SectionForGlobal(F, *Mang, TM));
} else {
// Otherwise, drop it in the readonly section.
const MCSection *ReadOnlySection =
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))
+ if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, *Mang, TM))
OutStreamer.EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
}
}
if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
const MDNode *N = NMD->getOperand(i);
- assert(N->getNumOperands() == 1 &&
+ assert(N->getNumOperands() == 1 &&
"llvm.ident metadata entry can have only one operand");
const MDString *S = cast<MDString>(N->getOperand(0));
OutStreamer.EmitIdent(S->getString());
@@ -1500,7 +1579,7 @@ void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
if (getCurrentSection()->getKind().isText())
OutStreamer.EmitCodeAlignment(1 << NumBits);
else
- OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
+ OutStreamer.EmitValueToAlignment(1 << NumBits);
}
//===----------------------------------------------------------------------===//
}
if (const MCExpr *RelocExpr =
- AP.getObjFileLowering().getExecutableRelativeSymbol(CE, AP.Mang))
+ AP.getObjFileLowering().getExecutableRelativeSymbol(CE, *AP.Mang,
+ AP.TM))
return RelocExpr;
switch (CE->getOpcode()) {
MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
StringRef Suffix) const {
- return getObjFileLowering().getSymbolWithGlobalValueBase(*Mang, GV, Suffix);
+ return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, *Mang,
+ TM);
}
/// GetExternalSymbolSymbol - Return the MCSymbol for the specified