#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
MCCodeEmitter &CE,
raw_ostream &OS);
- void AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment, bool External);
-
// MCStreamer interface
- virtual void InitSections();
- virtual void InitToTextSection();
- virtual void EmitLabel(MCSymbol *Symbol);
- virtual void EmitDebugLabel(MCSymbol *Symbol);
- virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
- virtual void EmitThumbFunc(MCSymbol *Func);
- virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
- virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
- virtual void BeginCOFFSymbolDef(MCSymbol const *Symbol);
- virtual void EmitCOFFSymbolStorageClass(int StorageClass);
- virtual void EmitCOFFSymbolType(int Type);
- virtual void EndCOFFSymbolDef();
- virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
- virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
- virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment);
- virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment);
- virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size,unsigned ByteAlignment);
- virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment);
- virtual void EmitFileDirective(StringRef Filename);
- virtual void EmitWin64EHHandlerData();
- virtual void FinishImpl();
-
- static bool classof(const MCStreamer *S) {
- return S->getKind() == SK_WinCOFFStreamer;
- }
+ void InitSections() override;
+ void EmitLabel(MCSymbol *Symbol) override;
+ void EmitDebugLabel(MCSymbol *Symbol) override;
+ void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
+ void EmitThumbFunc(MCSymbol *Func) override;
+ bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
+ void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
+ void BeginCOFFSymbolDef(MCSymbol const *Symbol) override;
+ void EmitCOFFSymbolStorageClass(int StorageClass) override;
+ void EmitCOFFSymbolType(int Type) override;
+ void EndCOFFSymbolDef() override;
+ void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
+ void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
+ void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
+ void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) override;
+ void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) override;
+ void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size,unsigned ByteAlignment) override;
+ void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) override;
+ void EmitFileDirective(StringRef Filename) override;
+ void EmitIdent(StringRef IdentString) override;
+ void EmitWin64EHHandlerData() override;
+ void FinishImpl() override;
private:
- virtual void EmitInstToData(const MCInst &Inst) {
+ void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override {
MCDataFragment *DF = getOrCreateDataFragment();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
- getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
VecOS.flush();
// Add the fixups and data.
}
DF->getContents().append(Code.begin(), Code.end());
}
-
- void SetSection(StringRef Section,
- unsigned Characteristics,
- SectionKind Kind) {
- SwitchSection(getContext().getCOFFSection(Section, Characteristics, Kind));
- }
-
- void SetSectionText() {
- SetSection(".text",
- COFF::IMAGE_SCN_CNT_CODE
- | COFF::IMAGE_SCN_MEM_EXECUTE
- | COFF::IMAGE_SCN_MEM_READ,
- SectionKind::getText());
- EmitCodeAlignment(4, 0);
- }
-
- void SetSectionData() {
- SetSection(".data",
- COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
- | COFF::IMAGE_SCN_MEM_READ
- | COFF::IMAGE_SCN_MEM_WRITE,
- SectionKind::getDataRel());
- EmitCodeAlignment(4, 0);
- }
-
- void SetSectionBSS() {
- SetSection(".bss",
- COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA
- | COFF::IMAGE_SCN_MEM_READ
- | COFF::IMAGE_SCN_MEM_WRITE,
- SectionKind::getBSS());
- EmitCodeAlignment(4, 0);
- }
};
} // end anonymous namespace.
WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
MCCodeEmitter &CE, raw_ostream &OS)
- : MCObjectStreamer(SK_WinCOFFStreamer, Context, MAB, OS, &CE),
- CurSymbol(NULL) {}
-
-void WinCOFFStreamer::AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment, bool External) {
- assert(!Symbol->isInSection() && "Symbol must not already have a section!");
-
- std::string SectionName(".bss$linkonce");
- SectionName.append(Symbol->getName().begin(), Symbol->getName().end());
-
- MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol);
+ : MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {}
- unsigned Characteristics =
- COFF::IMAGE_SCN_LNK_COMDAT |
- COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
- COFF::IMAGE_SCN_MEM_READ |
- COFF::IMAGE_SCN_MEM_WRITE;
-
- int Selection = COFF::IMAGE_COMDAT_SELECT_LARGEST;
-
- const MCSection *Section = MCStreamer::getContext().getCOFFSection(
- SectionName, Characteristics, SectionKind::getBSS(), Selection);
-
- MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section);
-
- if (SectionData.getAlignment() < ByteAlignment)
- SectionData.setAlignment(ByteAlignment);
-
- SymbolData.setExternal(External);
-
- AssignSection(Symbol, Section);
-
- if (ByteAlignment != 1)
- new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData);
+// MCStreamer interface
- SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData));
-}
+void WinCOFFStreamer::InitSections() {
+ // FIXME: this is identical to the ELF one.
+ // This emulates the same behavior of GNU as. This makes it easier
+ // to compare the output as the major sections are in the same order.
+ SwitchSection(getContext().getObjectFileInfo()->getTextSection());
+ EmitCodeAlignment(4);
-// MCStreamer interface
+ SwitchSection(getContext().getObjectFileInfo()->getDataSection());
+ EmitCodeAlignment(4);
-void WinCOFFStreamer::InitToTextSection() {
- SetSectionText();
-}
+ SwitchSection(getContext().getObjectFileInfo()->getBSSSection());
+ EmitCodeAlignment(4);
-void WinCOFFStreamer::InitSections() {
- SetSectionText();
- SetSectionData();
- SetSectionBSS();
- SetSectionText();
+ SwitchSection(getContext().getObjectFileInfo()->getTextSection());
}
void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol && "Symbol must be non-null!");
assert((Symbol->isInSection()
? Symbol->getSection().getVariant() == MCSection::SV_COFF
- : true) && "Got non COFF section in the COFF backend!");
+ : true) && "Got non-COFF section in the COFF backend!");
switch (Attribute) {
case MCSA_WeakReference:
case MCSA_Weak: {
void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
assert((Symbol->isInSection()
? Symbol->getSection().getVariant() == MCSection::SV_COFF
- : true) && "Got non COFF section in the COFF backend!");
- assert(CurSymbol == NULL && "EndCOFFSymbolDef must be called between calls "
- "to BeginCOFFSymbolDef!");
+ : true) && "Got non-COFF section in the COFF backend!");
+ assert(!CurSymbol && "EndCOFFSymbolDef must be called between calls "
+ "to BeginCOFFSymbolDef!");
CurSymbol = Symbol;
}
void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
- assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
+ assert(CurSymbol && "BeginCOFFSymbolDef must be called first!");
assert((StorageClass & ~0xFF) == 0 && "StorageClass must only have data in "
"the first byte!");
}
void WinCOFFStreamer::EmitCOFFSymbolType(int Type) {
- assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
+ assert(CurSymbol && "BeginCOFFSymbolDef must be called first!");
assert((Type & ~0xFFFF) == 0 && "Type must only have data in the first 2 "
"bytes");
}
void WinCOFFStreamer::EndCOFFSymbolDef() {
- assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
- CurSymbol = NULL;
+ assert(CurSymbol && "BeginCOFFSymbolDef must be called first!");
+ CurSymbol = nullptr;
}
-void WinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol)
-{
+void WinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
MCDataFragment *DF = getOrCreateDataFragment();
+ DF->getFixups().push_back(MCFixup::Create(
+ DF->getContents().size(), MCSymbolRefExpr::Create(Symbol, getContext()),
+ FK_SecRel_2));
+ DF->getContents().resize(DF->getContents().size() + 4, 0);
+}
- DF->getFixups().push_back(
- MCFixup::Create(DF->getContents().size(),
- MCSymbolRefExpr::Create (Symbol, getContext ()),
- FK_SecRel_4));
+void WinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+ DF->getFixups().push_back(MCFixup::Create(
+ DF->getContents().size(), MCSymbolRefExpr::Create(Symbol, getContext()),
+ FK_SecRel_4));
DF->getContents().resize(DF->getContents().size() + 4, 0);
}
unsigned ByteAlignment) {
assert((Symbol->isInSection()
? Symbol->getSection().getVariant() == MCSection::SV_COFF
- : true) && "Got non COFF section in the COFF backend!");
- AddCommonSymbol(Symbol, Size, ByteAlignment, true);
+ : true) && "Got non-COFF section in the COFF backend!");
+
+ if (ByteAlignment > 32)
+ report_fatal_error(
+ "The linker won't align common symbols beyond 32 bytes.");
+
+ AssignSection(Symbol, nullptr);
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setExternal(true);
+ SD.setCommon(Size, ByteAlignment);
}
void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {
- assert((Symbol->isInSection()
- ? Symbol->getSection().getVariant() == MCSection::SV_COFF
- : true) && "Got non COFF section in the COFF backend!");
- AddCommonSymbol(Symbol, Size, ByteAlignment, false);
+ assert(!Symbol->isInSection() && "Symbol must not already have a section!");
+
+ const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection();
+ MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section);
+ if (SectionData.getAlignment() < ByteAlignment)
+ SectionData.setAlignment(ByteAlignment);
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setExternal(false);
+
+ AssignSection(Symbol, Section);
+
+ if (ByteAlignment != 1)
+ new MCAlignFragment(ByteAlignment, /*_Value=*/0, /*_ValueSize=*/0,
+ ByteAlignment, &SectionData);
+
+ SD.setFragment(
+ new MCFillFragment(/*_Value=*/0, /*_ValueSize=*/0, Size, &SectionData));
}
void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
}
void WinCOFFStreamer::EmitFileDirective(StringRef Filename) {
- // Ignore for now, linkers don't care, and proper debug
- // info will be a much large effort.
+ getAssembler().addFileName(Filename);
+}
+
+// TODO: Implement this if you want to emit .comment section in COFF obj files.
+void WinCOFFStreamer::EmitIdent(StringRef IdentString) {
+ llvm_unreachable("unsupported directive");
}
void WinCOFFStreamer::EmitWin64EHHandlerData() {
}
void WinCOFFStreamer::FinishImpl() {
+ EmitFrames(nullptr, true);
EmitW64Tables();
MCObjectStreamer::FinishImpl();
}
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