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MC: Add WinCOFFObjectWriter implementation.
Origonal Windows COFF implementation by Nathan Jedffords. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109389 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
parent
6f4e4df100
commit
801a359116
@ -202,7 +202,7 @@ namespace COFF {
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IMAGE_REL_I386_REL32 = 0x0014
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};
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enum {
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enum COMDATType {
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IMAGE_COMDAT_SELECT_NODUPLICATES = 1,
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IMAGE_COMDAT_SELECT_ANY,
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IMAGE_COMDAT_SELECT_SAME_SIZE,
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@ -211,6 +211,58 @@ namespace COFF {
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IMAGE_COMDAT_SELECT_LARGEST
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};
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// Auxiliary Symbol Formats
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struct AuxiliaryFunctionDefinition {
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uint32_t TagIndex;
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uint32_t TotalSize;
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uint32_t PointerToLinenumber;
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uint32_t PointerToNextFunction;
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uint8_t unused[2];
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};
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struct AuxiliarybfAndefSymbol {
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uint8_t unused1[4];
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uint16_t Linenumber;
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uint8_t unused2[6];
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uint32_t PointerToNextFunction;
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uint8_t unused3[2];
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};
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struct AuxiliaryWeakExternal {
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uint32_t TagIndex;
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uint32_t Characteristics;
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uint8_t unused[10];
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};
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/// These are not documented in the spec, but are located in WinNT.h.
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enum WeakExternalCharacteristics {
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IMAGE_WEAK_EXTERN_SEARCH_NOLIBRARY = 1,
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IMAGE_WEAK_EXTERN_SEARCH_LIBRARY = 2,
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IMAGE_WEAK_EXTERN_SEARCH_ALIAS = 3
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};
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struct AuxiliaryFile {
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uint8_t FileName[18];
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};
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struct AuxiliarySectionDefinition {
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uint32_t Length;
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uint16_t NumberOfRelocations;
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uint16_t NumberOfLinenumbers;
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uint32_t CheckSum;
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uint16_t Number;
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uint8_t Selection;
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uint8_t unused[3];
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};
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union Auxiliary {
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AuxiliaryFunctionDefinition FunctionDefinition;
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AuxiliarybfAndefSymbol bfAndefSymbol;
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AuxiliaryWeakExternal WeakExternal;
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AuxiliaryFile File;
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AuxiliarySectionDefinition SectionDefinition;
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};
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} // End namespace llvm.
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} // End namespace COFF.
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@ -12,41 +12,537 @@
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "WinCOFFObjectWriter"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/COFF.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstdio>
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using namespace llvm;
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namespace {
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typedef llvm::SmallString<COFF::NameSize> name;
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class WinCOFFObjectWriter : public MCObjectWriter {
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public:
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WinCOFFObjectWriter(raw_ostream &OS);
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enum AuxiliaryType {
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ATFunctionDefinition,
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ATbfAndefSymbol,
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ATWeakExternal,
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ATFile,
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ATSectionDefinition
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};
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// MCObjectWriter interface implementation.
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struct AuxSymbol {
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AuxiliaryType AuxType;
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COFF::Auxiliary Aux;
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};
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void ExecutePostLayoutBinding(MCAssembler &Asm);
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class COFFSymbol {
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public:
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COFF::symbol Data;
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void RecordRelocation(const MCAssembler &Asm,
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const MCAsmLayout &Layout,
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const MCFragment *Fragment,
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const MCFixup &Fixup,
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MCValue Target,
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uint64_t &FixedValue);
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typedef llvm::SmallVector<AuxSymbol, 1> AuxiliarySymbols;
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void WriteObject(const MCAssembler &Asm, const MCAsmLayout &Layout);
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};
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name Name;
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size_t Index;
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AuxiliarySymbols Aux;
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COFFSymbol *Other;
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MCSymbolData const *MCData;
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COFFSymbol(llvm::StringRef name, size_t index);
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size_t size() const;
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void set_name_offset(uint32_t Offset);
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};
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// This class contains staging data for a COFF relocation entry.
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struct COFFRelocation {
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COFF::relocation Data;
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COFFSymbol *Symb;
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COFFRelocation() : Symb(NULL) {}
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static size_t size() { return COFF::RelocationSize; }
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};
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typedef std::vector<COFFRelocation> relocations;
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class COFFSection {
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public:
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COFF::section Header;
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std::string Name;
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size_t Number;
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MCSectionData const *MCData;
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COFFSymbol *Symb;
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relocations Relocations;
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COFFSection(llvm::StringRef name, size_t Index);
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static size_t size();
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};
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// This class holds the COFF string table.
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class StringTable {
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typedef llvm::StringMap<size_t> map;
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map Map;
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void update_length();
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public:
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std::vector<char> Data;
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StringTable();
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size_t size() const;
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size_t insert(llvm::StringRef String);
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};
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class WinCOFFObjectWriter : public MCObjectWriter {
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public:
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typedef std::vector<COFFSymbol*> symbols;
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typedef std::vector<COFFSection*> sections;
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typedef StringMap<COFFSymbol *> name_symbol_map;
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typedef StringMap<COFFSection *> name_section_map;
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typedef DenseMap<MCSymbolData const *, COFFSymbol *> symbol_map;
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typedef DenseMap<MCSectionData const *, COFFSection *> section_map;
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// Root level file contents.
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COFF::header Header;
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sections Sections;
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symbols Symbols;
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StringTable Strings;
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// Maps used during object file creation.
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section_map SectionMap;
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symbol_map SymbolMap;
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WinCOFFObjectWriter(raw_ostream &OS);
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COFFSymbol *createSymbol(llvm::StringRef Name);
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COFFSection *createSection(llvm::StringRef Name);
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void InitCOFFEntity(COFFSymbol &Symbol);
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void InitCOFFEntity(COFFSection &Section);
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template <typename object_t, typename list_t>
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object_t *createCOFFEntity(llvm::StringRef Name, list_t &List);
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void DefineSection(MCSectionData const &SectionData);
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void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler);
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bool ExportSection(COFFSection *S);
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bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
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// Entity writing methods.
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void WriteFileHeader(const COFF::header &Header);
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void WriteSymbol(const COFFSymbol *S);
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void WriteAuxiliarySymbols(const COFFSymbol::AuxiliarySymbols &S);
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void WriteSectionHeader(const COFF::section &S);
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void WriteRelocation(const COFF::relocation &R);
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// MCObjectWriter interface implementation.
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void ExecutePostLayoutBinding(MCAssembler &Asm);
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void RecordRelocation(const MCAssembler &Asm,
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const MCAsmLayout &Layout,
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const MCFragment *Fragment,
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const MCFixup &Fixup,
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MCValue Target,
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uint64_t &FixedValue);
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void WriteObject(const MCAssembler &Asm, const MCAsmLayout &Layout);
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};
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}
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static inline void write_uint32_le(void *Data, uint32_t const &Value) {
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uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
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Ptr[0] = (Value & 0x000000FF) >> 0;
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Ptr[1] = (Value & 0x0000FF00) >> 8;
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Ptr[2] = (Value & 0x00FF0000) >> 16;
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Ptr[3] = (Value & 0xFF000000) >> 24;
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}
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static inline void write_uint16_le(void *Data, uint16_t const &Value) {
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uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
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Ptr[0] = (Value & 0x00FF) >> 0;
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Ptr[1] = (Value & 0xFF00) >> 8;
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}
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static inline void write_uint8_le(void *Data, uint8_t const &Value) {
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uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
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Ptr[0] = (Value & 0xFF) >> 0;
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}
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//------------------------------------------------------------------------------
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// Symbol class implementation
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COFFSymbol::COFFSymbol(llvm::StringRef name, size_t index)
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: Name(name.begin(), name.end()), Index(-1)
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, Other(NULL), MCData(NULL) {
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memset(&Data, 0, sizeof(Data));
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}
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size_t COFFSymbol::size() const {
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return COFF::SymbolSize + (Data.NumberOfAuxSymbols * COFF::SymbolSize);
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}
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// In the case that the name does not fit within 8 bytes, the offset
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// into the string table is stored in the last 4 bytes instead, leaving
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// the first 4 bytes as 0.
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void COFFSymbol::set_name_offset(uint32_t Offset) {
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write_uint32_le(Data.Name + 0, 0);
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write_uint32_le(Data.Name + 4, Offset);
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}
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//------------------------------------------------------------------------------
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// Section class implementation
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COFFSection::COFFSection(llvm::StringRef name, size_t Index)
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: Name(name), Number(Index + 1)
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, MCData(NULL), Symb(NULL) {
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memset(&Header, 0, sizeof(Header));
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}
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size_t COFFSection::size() {
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return COFF::SectionSize;
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}
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//------------------------------------------------------------------------------
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// StringTable class implementation
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/// Write the length of the string table into Data.
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/// The length of the string table includes uint32 length header.
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void StringTable::update_length() {
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write_uint32_le(&Data.front(), Data.size());
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}
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StringTable::StringTable() {
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// The string table data begins with the length of the entire string table
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// including the length header. Allocate space for this header.
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Data.resize(4);
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}
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size_t StringTable::size() const {
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return Data.size();
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}
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/// Add String to the table iff it is not already there.
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/// @returns the index into the string table where the string is now located.
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size_t StringTable::insert(llvm::StringRef String) {
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map::iterator i = Map.find(String);
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if (i != Map.end())
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return i->second;
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size_t Offset = Data.size();
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// Insert string data into string table.
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Data.insert(Data.end(), String.begin(), String.end());
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Data.push_back('\0');
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// Put a reference to it in the map.
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Map[String] = Offset;
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// Update the internal length field.
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update_length();
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return Offset;
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}
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//------------------------------------------------------------------------------
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// WinCOFFObjectWriter class implementation
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WinCOFFObjectWriter::WinCOFFObjectWriter(raw_ostream &OS)
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: MCObjectWriter(OS, true) {
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memset(&Header, 0, sizeof(Header));
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// TODO: Move magic constant out to COFF.h
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Header.Machine = 0x14C; // x86
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}
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COFFSymbol *WinCOFFObjectWriter::createSymbol(llvm::StringRef Name) {
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return createCOFFEntity<COFFSymbol>(Name, Symbols);
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}
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COFFSection *WinCOFFObjectWriter::createSection(llvm::StringRef Name) {
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return createCOFFEntity<COFFSection>(Name, Sections);
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}
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/// This function initializes a symbol by entering its name into the string
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/// table if it is too long to fit in the symbol table header.
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void WinCOFFObjectWriter::InitCOFFEntity(COFFSymbol &S) {
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if (S.Name.size() > COFF::NameSize) {
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size_t StringTableEntry = Strings.insert(S.Name.c_str());
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S.set_name_offset(StringTableEntry);
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} else
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memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
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}
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/// This function initializes a section by entering its name into the string
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/// table if it is too long to fit in the section table header.
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void WinCOFFObjectWriter::InitCOFFEntity(COFFSection &S) {
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if (S.Name.size() > COFF::NameSize) {
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size_t StringTableEntry = Strings.insert(S.Name.c_str());
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// FIXME: Why is this number 999999? This number is never mentioned in the
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// spec. I'm assuming this is due to the printed value needing to fit into
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// the S.Header.Name field. In which case why not 9999999 (7 9's instead of
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// 6)? The spec does not state if this entry should be null terminated in
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// this case, and thus this seems to be the best way to do it. I think I
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// just solved my own FIXME...
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if (StringTableEntry > 999999)
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report_fatal_error("COFF string table is greater than 999999 bytes.");
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sprintf(S.Header.Name, "/%d", StringTableEntry);
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} else
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memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
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}
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/// A template used to lookup or create a symbol/section, and initialize it if
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/// needed.
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template <typename object_t, typename list_t>
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object_t *WinCOFFObjectWriter::createCOFFEntity(llvm::StringRef Name,
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list_t &List) {
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object_t *Object = new object_t(Name, List.size());
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InitCOFFEntity(*Object);
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List.push_back(Object);
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return Object;
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}
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/// This function takes a section data object from the assembler
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/// and creates the associated COFF section staging object.
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void WinCOFFObjectWriter::DefineSection(MCSectionData const &SectionData) {
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// FIXME: Not sure how to verify this (at least in a debug build).
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MCSectionCOFF const &Sec =
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static_cast<MCSectionCOFF const &>(SectionData.getSection());
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COFFSection *coff_section = createSection(Sec.getSectionName());
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COFFSymbol *coff_symbol = createSymbol(Sec.getSectionName());
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coff_section->Symb = coff_symbol;
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coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_STATIC;
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coff_symbol->Data.SectionNumber = coff_section->Number;
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// In this case the auxiliary symbol is a Section Definition.
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coff_symbol->Aux.resize(1);
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memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
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coff_symbol->Aux[0].AuxType = ATSectionDefinition;
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coff_symbol->Aux[0].Aux.SectionDefinition.Number = coff_section->Number;
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coff_symbol->Aux[0].Aux.SectionDefinition.Selection = Sec.getSelection();
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coff_section->Header.Characteristics = Sec.getCharacteristics();
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uint32_t &Characteristics = coff_section->Header.Characteristics;
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switch (SectionData.getAlignment()) {
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case 1: Characteristics |= COFF::IMAGE_SCN_ALIGN_1BYTES; break;
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case 2: Characteristics |= COFF::IMAGE_SCN_ALIGN_2BYTES; break;
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case 4: Characteristics |= COFF::IMAGE_SCN_ALIGN_4BYTES; break;
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case 8: Characteristics |= COFF::IMAGE_SCN_ALIGN_8BYTES; break;
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case 16: Characteristics |= COFF::IMAGE_SCN_ALIGN_16BYTES; break;
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case 32: Characteristics |= COFF::IMAGE_SCN_ALIGN_32BYTES; break;
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case 64: Characteristics |= COFF::IMAGE_SCN_ALIGN_64BYTES; break;
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case 128: Characteristics |= COFF::IMAGE_SCN_ALIGN_128BYTES; break;
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case 256: Characteristics |= COFF::IMAGE_SCN_ALIGN_256BYTES; break;
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case 512: Characteristics |= COFF::IMAGE_SCN_ALIGN_512BYTES; break;
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case 1024: Characteristics |= COFF::IMAGE_SCN_ALIGN_1024BYTES; break;
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case 2048: Characteristics |= COFF::IMAGE_SCN_ALIGN_2048BYTES; break;
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case 4096: Characteristics |= COFF::IMAGE_SCN_ALIGN_4096BYTES; break;
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case 8192: Characteristics |= COFF::IMAGE_SCN_ALIGN_8192BYTES; break;
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default:
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llvm_unreachable("unsupported section alignment");
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}
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// Bind internal COFF section to MC section.
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coff_section->MCData = &SectionData;
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SectionMap[&SectionData] = coff_section;
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}
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/// This function takes a section data object from the assembler
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/// and creates the associated COFF symbol staging object.
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void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
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MCAssembler &Assembler) {
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COFFSymbol *coff_symbol = createSymbol(SymbolData.getSymbol().getName());
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coff_symbol->Data.Type = (SymbolData.getFlags() & 0x0000FFFF) >> 0;
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coff_symbol->Data.StorageClass = (SymbolData.getFlags() & 0x00FF0000) >> 16;
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// If no storage class was specified in the streamer, define it here.
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if (coff_symbol->Data.StorageClass == 0) {
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bool external = SymbolData.isExternal() || (SymbolData.Fragment == NULL);
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coff_symbol->Data.StorageClass =
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external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
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}
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if (SymbolData.getFlags() & COFF::SF_WeakReference) {
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coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
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|
||||
const MCExpr *Value = SymbolData.getSymbol().getVariableValue();
|
||||
|
||||
// FIXME: This assert message isn't very good.
|
||||
assert(Value->getKind() == MCExpr::SymbolRef &&
|
||||
"Value must be a SymbolRef!");
|
||||
|
||||
const MCSymbolRefExpr *SymbolRef =
|
||||
static_cast<const MCSymbolRefExpr *>(Value);
|
||||
|
||||
const MCSymbolData &OtherSymbolData =
|
||||
Assembler.getSymbolData(SymbolRef->getSymbol());
|
||||
|
||||
// FIXME: This assert message isn't very good.
|
||||
assert(SymbolMap.find(&OtherSymbolData) != SymbolMap.end() &&
|
||||
"OtherSymbolData must be in the symbol map!");
|
||||
|
||||
coff_symbol->Other = SymbolMap[&OtherSymbolData];
|
||||
|
||||
// Setup the Weak External auxiliary symbol.
|
||||
coff_symbol->Aux.resize(1);
|
||||
memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
|
||||
coff_symbol->Aux[0].AuxType = ATWeakExternal;
|
||||
coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = 0;
|
||||
coff_symbol->Aux[0].Aux.WeakExternal.Characteristics =
|
||||
COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY;
|
||||
}
|
||||
|
||||
// Bind internal COFF symbol to MC symbol.
|
||||
coff_symbol->MCData = &SymbolData;
|
||||
SymbolMap[&SymbolData] = coff_symbol;
|
||||
}
|
||||
|
||||
bool WinCOFFObjectWriter::ExportSection(COFFSection *S) {
|
||||
return (S->Header.Characteristics
|
||||
& COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0;
|
||||
}
|
||||
|
||||
bool WinCOFFObjectWriter::ExportSymbol(MCSymbolData const &SymbolData,
|
||||
MCAssembler &Asm) {
|
||||
// This doesn't seem to be right. Strings referred to from the .data section
|
||||
// need symbols so they can be linked to code in the .text section right?
|
||||
|
||||
// return Asm.isSymbolLinkerVisible (&SymbolData);
|
||||
|
||||
// For now, all symbols are exported, the linker will sort it out for us.
|
||||
return true;
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
// entity writing methods
|
||||
|
||||
void WinCOFFObjectWriter::WriteFileHeader(const COFF::header &Header) {
|
||||
WriteLE16(Header.Machine);
|
||||
WriteLE16(Header.NumberOfSections);
|
||||
WriteLE32(Header.TimeDateStamp);
|
||||
WriteLE32(Header.PointerToSymbolTable);
|
||||
WriteLE32(Header.NumberOfSymbols);
|
||||
WriteLE16(Header.SizeOfOptionalHeader);
|
||||
WriteLE16(Header.Characteristics);
|
||||
}
|
||||
|
||||
void WinCOFFObjectWriter::WriteSymbol(const COFFSymbol *S) {
|
||||
WriteBytes(StringRef(S->Data.Name, COFF::NameSize));
|
||||
WriteLE32(S->Data.Value);
|
||||
WriteLE16(S->Data.SectionNumber);
|
||||
WriteLE16(S->Data.Type);
|
||||
Write8(S->Data.StorageClass);
|
||||
Write8(S->Data.NumberOfAuxSymbols);
|
||||
WriteAuxiliarySymbols(S->Aux);
|
||||
}
|
||||
|
||||
void WinCOFFObjectWriter::WriteAuxiliarySymbols(
|
||||
const COFFSymbol::AuxiliarySymbols &S) {
|
||||
for(COFFSymbol::AuxiliarySymbols::const_iterator i = S.begin(), e = S.end();
|
||||
i != e; ++i) {
|
||||
switch(i->AuxType) {
|
||||
case ATFunctionDefinition:
|
||||
WriteLE32(i->Aux.FunctionDefinition.TagIndex);
|
||||
WriteLE32(i->Aux.FunctionDefinition.TotalSize);
|
||||
WriteLE32(i->Aux.FunctionDefinition.PointerToLinenumber);
|
||||
WriteLE32(i->Aux.FunctionDefinition.PointerToNextFunction);
|
||||
WriteZeros(sizeof(i->Aux.FunctionDefinition.unused));
|
||||
break;
|
||||
case ATbfAndefSymbol:
|
||||
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused1));
|
||||
WriteLE16(i->Aux.bfAndefSymbol.Linenumber);
|
||||
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused2));
|
||||
WriteLE32(i->Aux.bfAndefSymbol.PointerToNextFunction);
|
||||
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused3));
|
||||
break;
|
||||
case ATWeakExternal:
|
||||
WriteLE32(i->Aux.WeakExternal.TagIndex);
|
||||
WriteLE32(i->Aux.WeakExternal.Characteristics);
|
||||
WriteZeros(sizeof(i->Aux.WeakExternal.unused));
|
||||
break;
|
||||
case ATFile:
|
||||
WriteBytes(StringRef(reinterpret_cast<const char *>(i->Aux.File.FileName),
|
||||
sizeof(i->Aux.File.FileName)));
|
||||
break;
|
||||
case ATSectionDefinition:
|
||||
WriteLE32(i->Aux.SectionDefinition.Length);
|
||||
WriteLE16(i->Aux.SectionDefinition.NumberOfRelocations);
|
||||
WriteLE16(i->Aux.SectionDefinition.NumberOfLinenumbers);
|
||||
WriteLE32(i->Aux.SectionDefinition.CheckSum);
|
||||
WriteLE16(i->Aux.SectionDefinition.Number);
|
||||
Write8(i->Aux.SectionDefinition.Selection);
|
||||
WriteZeros(sizeof(i->Aux.SectionDefinition.unused));
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void WinCOFFObjectWriter::WriteSectionHeader(const COFF::section &S) {
|
||||
WriteBytes(StringRef(S.Name, COFF::NameSize));
|
||||
|
||||
WriteLE32(S.VirtualSize);
|
||||
WriteLE32(S.VirtualAddress);
|
||||
WriteLE32(S.SizeOfRawData);
|
||||
WriteLE32(S.PointerToRawData);
|
||||
WriteLE32(S.PointerToRelocations);
|
||||
WriteLE32(S.PointerToLineNumbers);
|
||||
WriteLE16(S.NumberOfRelocations);
|
||||
WriteLE16(S.NumberOfLineNumbers);
|
||||
WriteLE32(S.Characteristics);
|
||||
}
|
||||
|
||||
void WinCOFFObjectWriter::WriteRelocation(const COFF::relocation &R) {
|
||||
WriteLE32(R.VirtualAddress);
|
||||
WriteLE32(R.SymbolTableIndex);
|
||||
WriteLE16(R.Type);
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
// MCObjectWriter interface implementations
|
||||
|
||||
void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
|
||||
// "Define" each section & symbol. This creates section & symbol
|
||||
// entries in the staging area and gives them their final indexes.
|
||||
|
||||
for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; i++)
|
||||
DefineSection(*i);
|
||||
|
||||
for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
|
||||
e = Asm.symbol_end(); i != e; i++) {
|
||||
if (ExportSymbol(*i, Asm))
|
||||
DefineSymbol(*i, Asm);
|
||||
}
|
||||
}
|
||||
|
||||
void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
|
||||
@ -55,10 +551,174 @@ void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
|
||||
const MCFixup &Fixup,
|
||||
MCValue Target,
|
||||
uint64_t &FixedValue) {
|
||||
assert(Target.getSymA() != NULL && "Relocation must reference a symbol!");
|
||||
assert(Target.getSymB() == NULL &&
|
||||
"Relocation must reference only one symbol!");
|
||||
|
||||
MCSectionData const *SectionData = Fragment->getParent();
|
||||
MCSymbolData const *SymbolData =
|
||||
&Asm.getSymbolData(Target.getSymA()->getSymbol());
|
||||
|
||||
assert(SectionMap.find(SectionData) != SectionMap.end() &&
|
||||
"Section must already have been defined in ExecutePostLayoutBinding!");
|
||||
assert(SymbolMap.find(SymbolData) != SymbolMap.end() &&
|
||||
"Symbol must already have been defined in ExecutePostLayoutBinding!");
|
||||
|
||||
COFFSection *coff_section = SectionMap[SectionData];
|
||||
COFFSymbol *coff_symbol = SymbolMap[SymbolData];
|
||||
|
||||
FixedValue = Target.getConstant();
|
||||
|
||||
COFFRelocation Reloc;
|
||||
|
||||
Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
|
||||
Reloc.Symb = coff_symbol;
|
||||
|
||||
Reloc.Data.VirtualAddress += Fixup.getOffset();
|
||||
|
||||
switch (Fixup.getKind()) {
|
||||
case FirstTargetFixupKind: // reloc_pcrel_4byte
|
||||
Reloc.Data.Type = COFF::IMAGE_REL_I386_REL32;
|
||||
FixedValue += 4;
|
||||
break;
|
||||
case FK_Data_4:
|
||||
Reloc.Data.Type = COFF::IMAGE_REL_I386_DIR32;
|
||||
break;
|
||||
default:
|
||||
llvm_unreachable("unsupported relocation type");
|
||||
}
|
||||
|
||||
coff_section->Relocations.push_back(Reloc);
|
||||
}
|
||||
|
||||
void WinCOFFObjectWriter::WriteObject(const MCAssembler &Asm,
|
||||
const MCAsmLayout &Layout) {
|
||||
// Assign symbol and section indexes and offsets.
|
||||
|
||||
Header.NumberOfSymbols = 0;
|
||||
|
||||
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
|
||||
COFFSymbol *coff_symbol = *i;
|
||||
MCSymbolData const *SymbolData = coff_symbol->MCData;
|
||||
|
||||
coff_symbol->Index = Header.NumberOfSymbols++;
|
||||
|
||||
// Update section number & offset for symbols that have them.
|
||||
if ((SymbolData != NULL) && (SymbolData->Fragment != NULL)) {
|
||||
COFFSection *coff_section = SectionMap[SymbolData->Fragment->getParent()];
|
||||
|
||||
coff_symbol->Data.SectionNumber = coff_section->Number;
|
||||
coff_symbol->Data.Value = Layout.getFragmentOffset(SymbolData->Fragment);
|
||||
}
|
||||
|
||||
// Update auxiliary symbol info.
|
||||
coff_symbol->Data.NumberOfAuxSymbols = coff_symbol->Aux.size();
|
||||
Header.NumberOfSymbols += coff_symbol->Data.NumberOfAuxSymbols;
|
||||
}
|
||||
|
||||
// Fixup weak external references.
|
||||
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
|
||||
COFFSymbol *symb = *i;
|
||||
|
||||
if (symb->Other != NULL) {
|
||||
assert(symb->Aux.size() == 1 &&
|
||||
"Symbol must contain one aux symbol!");
|
||||
assert(symb->Aux[0].AuxType == ATWeakExternal &&
|
||||
"Symbol's aux symbol must be a Weak External!");
|
||||
symb->Aux[0].Aux.WeakExternal.TagIndex = symb->Other->Index;
|
||||
}
|
||||
}
|
||||
|
||||
// Assign file offsets to COFF object file structures.
|
||||
|
||||
unsigned offset = 0;
|
||||
|
||||
offset += COFF::HeaderSize;
|
||||
offset += COFF::SectionSize * Asm.size();
|
||||
|
||||
Header.NumberOfSections = Sections.size();
|
||||
|
||||
for (MCAssembler::const_iterator i = Asm.begin(),
|
||||
e = Asm.end();
|
||||
i != e; i++) {
|
||||
COFFSection *Sec = SectionMap[i];
|
||||
|
||||
Sec->Header.SizeOfRawData = Layout.getSectionFileSize(i);
|
||||
|
||||
if (ExportSection(Sec)) {
|
||||
Sec->Header.PointerToRawData = offset;
|
||||
|
||||
offset += Sec->Header.SizeOfRawData;
|
||||
}
|
||||
|
||||
if (Sec->Relocations.size() > 0) {
|
||||
Sec->Header.NumberOfRelocations = Sec->Relocations.size();
|
||||
Sec->Header.PointerToRelocations = offset;
|
||||
|
||||
offset += COFF::RelocationSize * Sec->Relocations.size();
|
||||
|
||||
for (relocations::iterator cr = Sec->Relocations.begin(),
|
||||
er = Sec->Relocations.end();
|
||||
cr != er; cr++) {
|
||||
(*cr).Data.SymbolTableIndex = (*cr).Symb->Index;
|
||||
}
|
||||
}
|
||||
|
||||
assert(Sec->Symb->Aux.size() == 1 && "Section's symbol must have one aux!");
|
||||
AuxSymbol &Aux = Sec->Symb->Aux[0];
|
||||
assert(Aux.AuxType == ATSectionDefinition &&
|
||||
"Section's symbol's aux symbol must be a Section Definition!");
|
||||
Aux.Aux.SectionDefinition.Length = Sec->Header.SizeOfRawData;
|
||||
Aux.Aux.SectionDefinition.NumberOfRelocations =
|
||||
Sec->Header.NumberOfRelocations;
|
||||
Aux.Aux.SectionDefinition.NumberOfLinenumbers =
|
||||
Sec->Header.NumberOfLineNumbers;
|
||||
}
|
||||
|
||||
Header.PointerToSymbolTable = offset;
|
||||
|
||||
// Write it all to disk...
|
||||
WriteFileHeader(Header);
|
||||
|
||||
{
|
||||
sections::iterator i, ie;
|
||||
MCAssembler::const_iterator j, je;
|
||||
|
||||
for (i = Sections.begin(), ie = Sections.end(); i != ie; i++)
|
||||
WriteSectionHeader((*i)->Header);
|
||||
|
||||
for (i = Sections.begin(), ie = Sections.end(),
|
||||
j = Asm.begin(), je = Asm.end();
|
||||
(i != ie) && (j != je); i++, j++) {
|
||||
if ((*i)->Header.PointerToRawData != 0) {
|
||||
assert(OS.tell() == (*i)->Header.PointerToRawData &&
|
||||
"Section::PointerToRawData is insane!");
|
||||
|
||||
Asm.WriteSectionData(j, Layout, this);
|
||||
}
|
||||
|
||||
if ((*i)->Relocations.size() > 0) {
|
||||
assert(OS.tell() == (*i)->Header.PointerToRelocations &&
|
||||
"Section::PointerToRelocations is insane!");
|
||||
|
||||
for (relocations::const_iterator k = (*i)->Relocations.begin(),
|
||||
ke = (*i)->Relocations.end();
|
||||
k != ke; k++) {
|
||||
WriteRelocation(k->Data);
|
||||
}
|
||||
} else
|
||||
assert((*i)->Header.PointerToRelocations == 0 &&
|
||||
"Section::PointerToRelocations is insane!");
|
||||
}
|
||||
}
|
||||
|
||||
assert(OS.tell() == Header.PointerToSymbolTable &&
|
||||
"Header::PointerToSymbolTable is insane!");
|
||||
|
||||
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++)
|
||||
WriteSymbol(*i);
|
||||
|
||||
OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
@ -68,4 +728,4 @@ namespace llvm {
|
||||
MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS) {
|
||||
return new WinCOFFObjectWriter(OS);
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user