mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 17:29:19 +00:00
Big change #1 for personality function references:
Eliminate the PersonalityPrefix/Suffix & NeedsIndirectEncoding fields from MAI: they aren't part of the asm syntax, they are related to the structure of the object file. To replace their functionality, add a new TLOF::getSymbolForDwarfGlobalReference method which asks targets to decide how to reference a global from EH in a pc-relative way. The default implementation just returns the symbol. The default darwin implementation references the symbol through an indirect $non_lazy_ptr stub. The bizarro x86-64 darwin specialization handles the weird "foo@GOTPCREL+4" hack. DwarfException.cpp now uses this to emit the reference to the symbol in the right way, and this also eliminates another horrible hack from DwarfException.cpp: - if (strcmp(MAI->getPersonalitySuffix(), "+4@GOTPCREL")) - O << "-" << MAI->getPCSymbol(); git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81991 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
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@ -84,17 +84,6 @@ namespace llvm {
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/// is "l" on Darwin, currently used for some ObjC metadata.
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/// is "l" on Darwin, currently used for some ObjC metadata.
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const char *LinkerPrivateGlobalPrefix; // Defaults to ""
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const char *LinkerPrivateGlobalPrefix; // Defaults to ""
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/// PersonalityPrefix/Suffix - If these are nonempty, these strings will
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/// enclose any personality function in the common frame section.
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///
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const char *PersonalityPrefix; // Defaults to ""
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const char *PersonalitySuffix; // Defaults to ""
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/// NeedsIndirectEncoding - If set, we need to set the indirect encoding bit
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/// for EH in Dwarf.
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///
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bool NeedsIndirectEncoding; // Defaults to false
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/// InlineAsmStart/End - If these are nonempty, they contain a directive to
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/// InlineAsmStart/End - If these are nonempty, they contain a directive to
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/// emit before and after an inline assembly statement.
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/// emit before and after an inline assembly statement.
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const char *InlineAsmStart; // Defaults to "#APP\n"
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const char *InlineAsmStart; // Defaults to "#APP\n"
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@ -353,15 +342,6 @@ namespace llvm {
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const char *getLinkerPrivateGlobalPrefix() const {
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const char *getLinkerPrivateGlobalPrefix() const {
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return LinkerPrivateGlobalPrefix;
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return LinkerPrivateGlobalPrefix;
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}
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}
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const char *getPersonalityPrefix() const {
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return PersonalityPrefix;
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}
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const char *getPersonalitySuffix() const {
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return PersonalitySuffix;
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}
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bool getNeedsIndirectEncoding() const {
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return NeedsIndirectEncoding;
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}
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const char *getInlineAsmStart() const {
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const char *getInlineAsmStart() const {
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return InlineAsmStart;
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return InlineAsmStart;
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}
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}
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@ -26,6 +26,7 @@ namespace llvm {
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class StringRef;
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class StringRef;
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class TargetMachine;
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class TargetMachine;
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class MCAsmInfo;
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class MCAsmInfo;
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class MCExpr;
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class TargetLoweringObjectFile {
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class TargetLoweringObjectFile {
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MCContext *Ctx;
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MCContext *Ctx;
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@ -173,6 +174,22 @@ public:
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return 0;
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return 0;
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}
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}
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/// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a
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/// pc-relative reference to the specified global variable from exception
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/// handling information. In addition to the symbol, this returns
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/// by-reference:
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///
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/// IsIndirect - True if the returned symbol is actually a stub that contains
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/// the address of the symbol, false if the symbol is the global itself.
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///
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/// IsPCRel - True if the symbol reference is already pc-relative, false if
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/// the caller needs to subtract off the address of the reference from the
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/// symbol.
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///
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virtual const MCExpr *
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getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
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bool &IsIndirect, bool &IsPCRel) const;
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protected:
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protected:
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virtual const MCSection *
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virtual const MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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@ -298,6 +315,12 @@ public:
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const MCSection *getNonLazySymbolPointerSection() const {
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const MCSection *getNonLazySymbolPointerSection() const {
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return NonLazySymbolPointerSection;
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return NonLazySymbolPointerSection;
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}
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}
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/// getSymbolForDwarfGlobalReference - The mach-o version of this method
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/// defaults to returning a stub reference.
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virtual const MCExpr *
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getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
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bool &IsIndirect, bool &IsPCRel) const;
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};
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};
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@ -17,9 +17,11 @@
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#include "llvm/CodeGen/MachineFrameInfo.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/MachineFunction.h"
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#include "llvm/CodeGen/MachineLocation.h"
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#include "llvm/CodeGen/MachineLocation.h"
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#include "llvm/MC/MCAsmInfo.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/MCSection.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/MCStreamer.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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@ -75,20 +77,22 @@ unsigned DwarfException::SizeOfEncodedValue(unsigned Encoding) {
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/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that
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/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that
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/// is shared among many Frame Description Entries. There is at least one CIE
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/// is shared among many Frame Description Entries. There is at least one CIE
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/// in every non-empty .debug_frame section.
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/// in every non-empty .debug_frame section.
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void DwarfException::EmitCIE(const Function *Personality, unsigned Index) {
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void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
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// Size and sign of stack growth.
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// Size and sign of stack growth.
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int stackGrowth =
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int stackGrowth =
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Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
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Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
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TargetFrameInfo::StackGrowsUp ?
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TargetFrameInfo::StackGrowsUp ?
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TD->getPointerSize() : -TD->getPointerSize();
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TD->getPointerSize() : -TD->getPointerSize();
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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// Begin eh frame section.
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// Begin eh frame section.
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Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getEHFrameSection());
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Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
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if (MAI->is_EHSymbolPrivate())
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if (MAI->is_EHSymbolPrivate())
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O << MAI->getPrivateGlobalPrefix();
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O << MAI->getPrivateGlobalPrefix();
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O << "EH_frame" << Index << ":\n";
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O << "EH_frame" << Index << ":\n";
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EmitLabel("section_eh_frame", Index);
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EmitLabel("section_eh_frame", Index);
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// Define base labels.
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// Define base labels.
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@ -107,11 +111,22 @@ void DwarfException::EmitCIE(const Function *Personality, unsigned Index) {
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Asm->EOL("CIE Version");
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Asm->EOL("CIE Version");
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// The personality presence indicates that language specific information will
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// The personality presence indicates that language specific information will
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// show up in the eh frame.
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// show up in the eh frame. Find out how we are supposed to lower the
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// personality function reference:
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const MCExpr *PersonalityRef = 0;
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bool IsPersonalityIndirect = false, IsPersonalityPCRel = false;
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if (PersonalityFn) {
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// FIXME: HANDLE STATIC CODEGEN MODEL HERE.
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// In non-static mode, ask the object file how to represent this reference.
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PersonalityRef =
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TLOF.getSymbolForDwarfGlobalReference(PersonalityFn, Asm->Mang,
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IsPersonalityIndirect,
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IsPersonalityPCRel);
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}
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// FIXME: Don't hardcode these encodings.
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unsigned PerEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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unsigned PerEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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if (Personality && MAI->getNeedsIndirectEncoding())
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if (IsPersonalityIndirect)
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PerEncoding |= dwarf::DW_EH_PE_indirect;
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PerEncoding |= dwarf::DW_EH_PE_indirect;
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unsigned LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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unsigned LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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unsigned FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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unsigned FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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@ -120,7 +135,7 @@ void DwarfException::EmitCIE(const Function *Personality, unsigned Index) {
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unsigned AugmentationSize = 0;
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unsigned AugmentationSize = 0;
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char *APtr = Augmentation + 1;
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char *APtr = Augmentation + 1;
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if (Personality) {
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if (PersonalityRef) {
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// There is a personality function.
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// There is a personality function.
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*APtr++ = 'P';
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*APtr++ = 'P';
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AugmentationSize += 1 + SizeOfEncodedValue(PerEncoding);
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AugmentationSize += 1 + SizeOfEncodedValue(PerEncoding);
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@ -159,15 +174,27 @@ void DwarfException::EmitCIE(const Function *Personality, unsigned Index) {
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Asm->EOL("Personality", PerEncoding);
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Asm->EOL("Personality", PerEncoding);
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// If there is a personality, we need to indicate the function's location.
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// If there is a personality, we need to indicate the function's location.
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if (Personality) {
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if (PersonalityRef) {
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// If the reference to the personality function symbol is not already
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// pc-relative, then we need to subtract our current address from it. Do
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// this by emitting a label and subtracting it from the expression we
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// already have. This is equivalent to emitting "foo - .", but we have to
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// emit the label for "." directly.
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if (!IsPersonalityPCRel) {
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SmallString<64> Name;
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raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
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<< "personalityref_addr" << Asm->getFunctionNumber() << "_" << Index;
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MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str());
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Asm->OutStreamer.EmitLabel(DotSym);
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PersonalityRef =
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MCBinaryExpr::CreateSub(PersonalityRef,
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MCSymbolRefExpr::Create(DotSym,Asm->OutContext),
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Asm->OutContext);
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}
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O << MAI->getData32bitsDirective();
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O << MAI->getData32bitsDirective();
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PersonalityRef->print(O, MAI);
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O << MAI->getPersonalityPrefix();
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O << Asm->Mang->getMangledName(Personality);
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O << MAI->getPersonalitySuffix();
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if (strcmp(MAI->getPersonalitySuffix(), "+4@GOTPCREL"))
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O << "-" << MAI->getPCSymbol();
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Asm->EOL("Personality");
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Asm->EOL("Personality");
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Asm->EmitInt8(LSDAEncoding);
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Asm->EmitInt8(LSDAEncoding);
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@ -185,8 +212,7 @@ void DwarfException::EmitCIE(const Function *Personality, unsigned Index) {
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// On Darwin the linker honors the alignment of eh_frame, which means it must
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// On Darwin the linker honors the alignment of eh_frame, which means it must
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// be 8-byte on 64-bit targets to match what gcc does. Otherwise you get
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// be 8-byte on 64-bit targets to match what gcc does. Otherwise you get
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// holes which confuse readers of eh_frame.
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// holes which confuse readers of eh_frame.
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Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
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Asm->EmitAlignment(TD->getPointerSize() == 4 ? 2 : 3, 0, 0, false);
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0, 0, false);
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EmitLabel("eh_frame_common_end", Index);
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EmitLabel("eh_frame_common_end", Index);
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Asm->EOL();
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Asm->EOL();
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@ -30,9 +30,6 @@ MCAsmInfo::MCAsmInfo() {
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GlobalPrefix = "";
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GlobalPrefix = "";
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PrivateGlobalPrefix = ".";
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PrivateGlobalPrefix = ".";
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LinkerPrivateGlobalPrefix = "";
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LinkerPrivateGlobalPrefix = "";
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PersonalityPrefix = "";
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PersonalitySuffix = "";
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NeedsIndirectEncoding = false;
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InlineAsmStart = "APP";
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InlineAsmStart = "APP";
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InlineAsmEnd = "NO_APP";
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InlineAsmEnd = "NO_APP";
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AssemblerDialect = 0;
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AssemblerDialect = 0;
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@ -20,9 +20,8 @@ MCAsmInfoDarwin::MCAsmInfoDarwin() {
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// Syntax:
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// Syntax:
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GlobalPrefix = "_";
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GlobalPrefix = "_";
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PrivateGlobalPrefix = "L";
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PrivateGlobalPrefix = "L";
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LinkerPrivateGlobalPrefix = "l"; // Marker for some ObjC metadata
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LinkerPrivateGlobalPrefix = "l";
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NeedsSet = true;
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NeedsSet = true;
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NeedsIndirectEncoding = true;
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AllowQuotesInName = true;
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AllowQuotesInName = true;
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HasSingleParameterDotFile = false;
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HasSingleParameterDotFile = false;
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@ -22,9 +22,6 @@ PPCMCAsmInfoDarwin::PPCMCAsmInfoDarwin(bool is64Bit) {
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if (!is64Bit)
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if (!is64Bit)
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Data64bitsDirective = 0; // We can't emit a 64-bit unit in PPC32 mode.
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Data64bitsDirective = 0; // We can't emit a 64-bit unit in PPC32 mode.
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AssemblerDialect = 1; // New-Style mnemonics.
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AssemblerDialect = 1; // New-Style mnemonics.
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PersonalityPrefix = "L";
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PersonalitySuffix = "$non_lazy_ptr";
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}
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}
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PPCLinuxMCAsmInfo::PPCLinuxMCAsmInfo(bool is64Bit) {
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PPCLinuxMCAsmInfo::PPCLinuxMCAsmInfo(bool is64Bit) {
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#include "llvm/Function.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/MC/MCContext.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/MCSectionMachO.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetData.h"
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@ -275,6 +276,30 @@ TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
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return DataSection;
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return DataSection;
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}
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}
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/// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a
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/// pc-relative reference to the specified global variable from exception
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/// handling information. In addition to the symbol, this returns
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/// by-reference:
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///
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/// IsIndirect - True if the returned symbol is actually a stub that contains
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/// the address of the symbol, false if the symbol is the global itself.
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///
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/// IsPCRel - True if the symbol reference is already pc-relative, false if
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/// the caller needs to subtract off the address of the reference from the
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/// symbol.
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///
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const MCExpr *TargetLoweringObjectFile::
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getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
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bool &IsIndirect, bool &IsPCRel) const {
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// The generic implementation of this just returns a direct reference to the
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// symbol.
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IsIndirect = false;
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IsPCRel = false;
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SmallString<128> Name;
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Mang->getNameWithPrefix(Name, GV, false);
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return MCSymbolRefExpr::Create(Name.str(), getContext());
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}
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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@ -929,6 +954,19 @@ shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const {
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return true;
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return true;
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}
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}
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const MCExpr *TargetLoweringObjectFileMachO::
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getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
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bool &IsIndirect, bool &IsPCRel) const {
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// The mach-o version of this method defaults to returning a stub reference.
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IsIndirect = true;
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IsPCRel = false;
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SmallString<128> Name;
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Mang->getNameWithPrefix(Name, GV, true);
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Name += "$non_lazy_ptr";
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return MCSymbolRefExpr::Create(Name.str(), getContext());
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}
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// COFF
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// COFF
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@ -1046,3 +1084,4 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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return getDataSection();
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return getDataSection();
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}
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}
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@ -16,6 +16,7 @@
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#include "X86InstrBuilder.h"
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#include "X86InstrBuilder.h"
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#include "X86ISelLowering.h"
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#include "X86ISelLowering.h"
|
||||||
#include "X86TargetMachine.h"
|
#include "X86TargetMachine.h"
|
||||||
|
#include "X86TargetObjectFile.h"
|
||||||
#include "llvm/CallingConv.h"
|
#include "llvm/CallingConv.h"
|
||||||
#include "llvm/Constants.h"
|
#include "llvm/Constants.h"
|
||||||
#include "llvm/DerivedTypes.h"
|
#include "llvm/DerivedTypes.h"
|
||||||
@ -36,7 +37,6 @@
|
|||||||
#include "llvm/Support/MathExtras.h"
|
#include "llvm/Support/MathExtras.h"
|
||||||
#include "llvm/Support/Debug.h"
|
#include "llvm/Support/Debug.h"
|
||||||
#include "llvm/Support/ErrorHandling.h"
|
#include "llvm/Support/ErrorHandling.h"
|
||||||
#include "llvm/Target/TargetLoweringObjectFile.h"
|
|
||||||
#include "llvm/Target/TargetOptions.h"
|
#include "llvm/Target/TargetOptions.h"
|
||||||
#include "llvm/ADT/SmallSet.h"
|
#include "llvm/ADT/SmallSet.h"
|
||||||
#include "llvm/ADT/StringExtras.h"
|
#include "llvm/ADT/StringExtras.h"
|
||||||
@ -63,6 +63,8 @@ static TargetLoweringObjectFile *createTLOF(X86TargetMachine &TM) {
|
|||||||
switch (TM.getSubtarget<X86Subtarget>().TargetType) {
|
switch (TM.getSubtarget<X86Subtarget>().TargetType) {
|
||||||
default: llvm_unreachable("unknown subtarget type");
|
default: llvm_unreachable("unknown subtarget type");
|
||||||
case X86Subtarget::isDarwin:
|
case X86Subtarget::isDarwin:
|
||||||
|
if (TM.getSubtarget<X86Subtarget>().is64Bit())
|
||||||
|
return new X8664_MachoTargetObjectFile();
|
||||||
return new TargetLoweringObjectFileMachO();
|
return new TargetLoweringObjectFileMachO();
|
||||||
case X86Subtarget::isELF:
|
case X86Subtarget::isELF:
|
||||||
return new TargetLoweringObjectFileELF();
|
return new TargetLoweringObjectFileELF();
|
||||||
|
@ -57,14 +57,6 @@ X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
|
|||||||
// Leopard and above support aligned common symbols.
|
// Leopard and above support aligned common symbols.
|
||||||
COMMDirectiveTakesAlignment = Triple.getDarwinMajorNumber() >= 9;
|
COMMDirectiveTakesAlignment = Triple.getDarwinMajorNumber() >= 9;
|
||||||
|
|
||||||
if (is64Bit) {
|
|
||||||
PersonalityPrefix = "";
|
|
||||||
PersonalitySuffix = "+4@GOTPCREL";
|
|
||||||
} else {
|
|
||||||
PersonalityPrefix = "L";
|
|
||||||
PersonalitySuffix = "$non_lazy_ptr";
|
|
||||||
}
|
|
||||||
|
|
||||||
CommentString = "##";
|
CommentString = "##";
|
||||||
PCSymbol = ".";
|
PCSymbol = ".";
|
||||||
|
|
||||||
|
33
lib/Target/X86/X86TargetObjectFile.cpp
Normal file
33
lib/Target/X86/X86TargetObjectFile.cpp
Normal file
@ -0,0 +1,33 @@
|
|||||||
|
//===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===//
|
||||||
|
//
|
||||||
|
// The LLVM Compiler Infrastructure
|
||||||
|
//
|
||||||
|
// This file is distributed under the University of Illinois Open Source
|
||||||
|
// License. See LICENSE.TXT for details.
|
||||||
|
//
|
||||||
|
//===----------------------------------------------------------------------===//
|
||||||
|
|
||||||
|
#include "X86TargetObjectFile.h"
|
||||||
|
#include "llvm/ADT/SmallString.h"
|
||||||
|
#include "llvm/Support/Mangler.h"
|
||||||
|
#include "llvm/MC/MCExpr.h"
|
||||||
|
using namespace llvm;
|
||||||
|
|
||||||
|
const MCExpr *X8664_MachoTargetObjectFile::
|
||||||
|
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
||||||
|
bool &IsIndirect, bool &IsPCRel) const {
|
||||||
|
|
||||||
|
// On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
|
||||||
|
// is an indirect pc-relative reference.
|
||||||
|
IsIndirect = true;
|
||||||
|
IsPCRel = true;
|
||||||
|
|
||||||
|
SmallString<128> Name;
|
||||||
|
Mang->getNameWithPrefix(Name, GV, false);
|
||||||
|
Name += "@GOTPCREL";
|
||||||
|
const MCExpr *Res =
|
||||||
|
MCSymbolRefExpr::Create(Name.str(), getContext());
|
||||||
|
const MCExpr *Four = MCConstantExpr::Create(4, getContext());
|
||||||
|
return MCBinaryExpr::CreateAdd(Res, Four, getContext());
|
||||||
|
}
|
||||||
|
|
28
lib/Target/X86/X86TargetObjectFile.h
Normal file
28
lib/Target/X86/X86TargetObjectFile.h
Normal file
@ -0,0 +1,28 @@
|
|||||||
|
//===-- llvm/Target/X86/X86TargetObjectFile.h - X86 Object Info -*- C++ -*-===//
|
||||||
|
//
|
||||||
|
// The LLVM Compiler Infrastructure
|
||||||
|
//
|
||||||
|
// This file is distributed under the University of Illinois Open Source
|
||||||
|
// License. See LICENSE.TXT for details.
|
||||||
|
//
|
||||||
|
//===----------------------------------------------------------------------===//
|
||||||
|
|
||||||
|
#ifndef LLVM_TARGET_X86_TARGETOBJECTFILE_H
|
||||||
|
#define LLVM_TARGET_X86_TARGETOBJECTFILE_H
|
||||||
|
|
||||||
|
#include "llvm/Target/TargetLoweringObjectFile.h"
|
||||||
|
|
||||||
|
namespace llvm {
|
||||||
|
|
||||||
|
/// X8664_MachoTargetObjectFile - This TLOF implementation is used for
|
||||||
|
/// Darwin/x86-64.
|
||||||
|
class X8664_MachoTargetObjectFile : public TargetLoweringObjectFileMachO {
|
||||||
|
public:
|
||||||
|
|
||||||
|
virtual const MCExpr *
|
||||||
|
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
||||||
|
bool &IsIndirect, bool &IsPCRel) const;
|
||||||
|
};
|
||||||
|
} // end namespace llvm
|
||||||
|
|
||||||
|
#endif
|
Loading…
Reference in New Issue
Block a user