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llvm-mc/Mach-O: Add section padding where needed (to align the next section).
Also, simplify some of Mach-O writer code which can now use section addresses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80067 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -82,7 +82,7 @@ public:
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uint64_t getAddress() const;
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uint64_t getAddress() const;
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unsigned getFileSize() const {
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uint64_t getFileSize() const {
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assert(FileSize != ~UINT64_C(0) && "File size not set!");
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assert(FileSize != ~UINT64_C(0) && "File size not set!");
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return FileSize;
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return FileSize;
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}
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}
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@ -267,6 +267,9 @@ private:
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/// initialized.
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/// initialized.
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uint64_t Address;
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uint64_t Address;
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/// Size - The content size of this section. This is ~0 until initialized.
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uint64_t Size;
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/// FileSize - The size of this section in the object file. This is ~0 until
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/// FileSize - The size of this section in the object file. This is ~0 until
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/// initialized.
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/// initialized.
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uint64_t FileSize;
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uint64_t FileSize;
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@ -305,13 +308,19 @@ public:
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//
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//
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// FIXME: This could all be kept private to the assembler implementation.
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// FIXME: This could all be kept private to the assembler implementation.
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unsigned getAddress() const {
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uint64_t getAddress() const {
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assert(Address != ~UINT64_C(0) && "Address not set!");
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assert(Address != ~UINT64_C(0) && "Address not set!");
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return Address;
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return Address;
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}
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}
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void setAddress(uint64_t Value) { Address = Value; }
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void setAddress(uint64_t Value) { Address = Value; }
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unsigned getFileSize() const {
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uint64_t getSize() const {
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assert(Size != ~UINT64_C(0) && "File size not set!");
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return Size;
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}
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void setSize(uint64_t Value) { Size = Value; }
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uint64_t getFileSize() const {
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assert(FileSize != ~UINT64_C(0) && "File size not set!");
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assert(FileSize != ~UINT64_C(0) && "File size not set!");
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return FileSize;
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return FileSize;
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}
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}
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@ -414,7 +423,11 @@ private:
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/// LayoutSection - Assign offsets and sizes to the fragments in the section
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/// LayoutSection - Assign offsets and sizes to the fragments in the section
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/// \arg SD, and update the section size. The section file offset should
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/// \arg SD, and update the section size. The section file offset should
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/// already have been computed.
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/// already have been computed.
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void LayoutSection(MCSectionData &SD);
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///
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/// \param NextAlign - The alignment for the section end address, which may
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/// add padding bytes to the section (these are included in the section "file"
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/// size, but not its regular size).
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void LayoutSection(MCSectionData &SD, unsigned NextAlign);
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public:
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public:
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/// Construct a new assembler instance.
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/// Construct a new assembler instance.
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@ -217,7 +217,7 @@ public:
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WriteString(Section.getSectionName(), 16);
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WriteString(Section.getSectionName(), 16);
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WriteString(Section.getSegmentName(), 16);
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WriteString(Section.getSegmentName(), 16);
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Write32(SD.getAddress()); // address
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Write32(SD.getAddress()); // address
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Write32(SD.getFileSize()); // size
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Write32(SD.getSize()); // size
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Write32(FileOffset);
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Write32(FileOffset);
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assert(isPowerOf2_32(SD.getAlignment()) && "Invalid alignment!");
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assert(isPowerOf2_32(SD.getAlignment()) && "Invalid alignment!");
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@ -508,11 +508,6 @@ public:
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ComputeSymbolTable(Asm, StringTable, LocalSymbolData, ExternalSymbolData,
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ComputeSymbolTable(Asm, StringTable, LocalSymbolData, ExternalSymbolData,
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UndefinedSymbolData);
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UndefinedSymbolData);
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// Compute the file offsets for all the sections in advance, so that we can
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// write things out in order.
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SmallVector<uint64_t, 16> SectionFileOffsets;
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SectionFileOffsets.resize(NumSections);
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// The section data starts after the header, the segment load command (and
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// The section data starts after the header, the segment load command (and
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// section headers) and the symbol table.
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// section headers) and the symbol table.
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unsigned NumLoadCommands = 1;
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unsigned NumLoadCommands = 1;
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@ -525,27 +520,22 @@ public:
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LoadCommandsSize += SymtabLoadCommandSize + DysymtabLoadCommandSize;
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LoadCommandsSize += SymtabLoadCommandSize + DysymtabLoadCommandSize;
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}
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}
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uint64_t FileOffset = Header32Size + LoadCommandsSize;
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uint64_t SectionDataStart = Header32Size + LoadCommandsSize;
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uint64_t SectionDataStartOffset = FileOffset;
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uint64_t SectionDataEnd = SectionDataStart;
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uint64_t SectionDataSize = 0;
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uint64_t SectionDataSize = 0;
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unsigned Index = 0;
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if (!Asm.getSectionList().empty()) {
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for (MCAssembler::iterator it = Asm.begin(),
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MCSectionData &SD = Asm.getSectionList().back();
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ie = Asm.end(); it != ie; ++it, ++Index) {
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SectionDataSize = SD.getAddress() + SD.getSize();
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SectionFileOffsets[Index] = FileOffset;
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SectionDataEnd = SectionDataStart + SD.getAddress() + SD.getFileSize();
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FileOffset += it->getFileSize();
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SectionDataSize += it->getFileSize();
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}
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}
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// Write the prolog, starting with the header and load command...
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// Write the prolog, starting with the header and load command...
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WriteHeader32(NumLoadCommands, LoadCommandsSize);
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WriteHeader32(NumLoadCommands, LoadCommandsSize);
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WriteSegmentLoadCommand32(NumSections, SectionDataStartOffset,
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WriteSegmentLoadCommand32(NumSections, SectionDataStart, SectionDataSize);
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SectionDataSize);
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// ... and then the section headers.
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// ... and then the section headers.
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Index = 0;
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for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
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for (MCAssembler::iterator it = Asm.begin(),
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WriteSection32(*it, SectionDataStart + it->getAddress());
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ie = Asm.end(); it != ie; ++it, ++Index)
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WriteSection32(*it, SectionFileOffsets[Index]);
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// Write the symbol table load command, if used.
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// Write the symbol table load command, if used.
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if (NumSymbols) {
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if (NumSymbols) {
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@ -563,11 +553,10 @@ public:
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// If used, the indirect symbols are written after the section data.
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// If used, the indirect symbols are written after the section data.
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if (NumIndirectSymbols)
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if (NumIndirectSymbols)
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IndirectSymbolOffset = SectionDataStartOffset + SectionDataSize;
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IndirectSymbolOffset = SectionDataEnd;
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// The symbol table is written after the indirect symbol data.
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// The symbol table is written after the indirect symbol data.
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uint64_t SymbolTableOffset =
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uint64_t SymbolTableOffset = SectionDataEnd + IndirectSymbolSize;
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SectionDataStartOffset + SectionDataSize + IndirectSymbolSize;
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// The string table is written after symbol table.
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// The string table is written after symbol table.
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uint64_t StringTableOffset =
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uint64_t StringTableOffset =
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@ -675,6 +664,7 @@ MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
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: Section(_Section),
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: Section(_Section),
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Alignment(1),
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Alignment(1),
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Address(~UINT64_C(0)),
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Address(~UINT64_C(0)),
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Size(~UINT64_C(0)),
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FileSize(~UINT64_C(0))
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FileSize(~UINT64_C(0))
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{
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{
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if (A)
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if (A)
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@ -701,26 +691,24 @@ MCAssembler::MCAssembler(raw_ostream &_OS) : OS(_OS) {}
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MCAssembler::~MCAssembler() {
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MCAssembler::~MCAssembler() {
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}
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}
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void MCAssembler::LayoutSection(MCSectionData &SD) {
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void MCAssembler::LayoutSection(MCSectionData &SD, unsigned NextAlign) {
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uint64_t Offset = 0;
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uint64_t Address = SD.getAddress();
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for (MCSectionData::iterator it = SD.begin(), ie = SD.end(); it != ie; ++it) {
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for (MCSectionData::iterator it = SD.begin(), ie = SD.end(); it != ie; ++it) {
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MCFragment &F = *it;
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MCFragment &F = *it;
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F.setOffset(Offset);
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F.setOffset(Address - SD.getAddress());
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// Evaluate fragment size.
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// Evaluate fragment size.
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switch (F.getKind()) {
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switch (F.getKind()) {
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case MCFragment::FT_Align: {
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case MCFragment::FT_Align: {
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MCAlignFragment &AF = cast<MCAlignFragment>(F);
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MCAlignFragment &AF = cast<MCAlignFragment>(F);
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uint64_t AlignedOffset = RoundUpToAlignment(Offset, AF.getAlignment());
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uint64_t Size = RoundUpToAlignment(Address, AF.getAlignment()) - Address;
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uint64_t PaddingBytes = AlignedOffset - Offset;
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if (Size > AF.getMaxBytesToEmit())
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if (PaddingBytes > AF.getMaxBytesToEmit())
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AF.setFileSize(0);
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AF.setFileSize(0);
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else
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else
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AF.setFileSize(PaddingBytes);
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AF.setFileSize(Size);
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break;
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break;
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}
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}
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@ -735,22 +723,24 @@ void MCAssembler::LayoutSection(MCSectionData &SD) {
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if (!OF.getOffset().isAbsolute())
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if (!OF.getOffset().isAbsolute())
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llvm_unreachable("FIXME: Not yet implemented!");
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llvm_unreachable("FIXME: Not yet implemented!");
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uint64_t OrgOffset = OF.getOffset().getConstant();
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uint64_t OrgOffset = OF.getOffset().getConstant();
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uint64_t Offset = Address - SD.getAddress();
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// FIXME: We need a way to communicate this error.
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// FIXME: We need a way to communicate this error.
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if (OrgOffset < Offset)
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if (OrgOffset < Offset)
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llvm_report_error("invalid .org offset '" + Twine(OrgOffset) +
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llvm_report_error("invalid .org offset '" + Twine(OrgOffset) +
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"' (section offset '" + Twine(Offset) + "'");
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"' (at offset '" + Twine(Offset) + "'");
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F.setFileSize(OrgOffset - Offset);
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F.setFileSize(OrgOffset - Offset);
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break;
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break;
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}
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}
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}
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}
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Offset += F.getFileSize();
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Address += F.getFileSize();
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}
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}
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// FIXME: Pad section?
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// Set the section sizes.
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SD.setFileSize(Offset);
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SD.setSize(Address - SD.getAddress());
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SD.setFileSize(RoundUpToAlignment(Address, NextAlign) - SD.getAddress());
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}
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}
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/// WriteFileData - Write the \arg F data to the output file.
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/// WriteFileData - Write the \arg F data to the output file.
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@ -836,16 +826,32 @@ static void WriteFileData(raw_ostream &OS, const MCSectionData &SD,
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ie = SD.end(); it != ie; ++it)
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ie = SD.end(); it != ie; ++it)
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WriteFileData(OS, *it, MOW);
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WriteFileData(OS, *it, MOW);
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// Add section padding.
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assert(SD.getFileSize() >= SD.getSize() && "Invalid section sizes!");
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MOW.WriteZeros(SD.getFileSize() - SD.getSize());
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assert(OS.tell() - Start == SD.getFileSize());
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assert(OS.tell() - Start == SD.getFileSize());
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}
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}
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void MCAssembler::Finish() {
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void MCAssembler::Finish() {
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// Layout the sections and fragments.
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// Layout the sections and fragments.
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uint64_t Address = 0;
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uint64_t Address = 0;
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for (iterator it = begin(), ie = end(); it != ie; ++it) {
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for (iterator it = begin(), ie = end(); it != ie;) {
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it->setAddress(Address);
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MCSectionData &SD = *it;
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LayoutSection(*it);
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Address += it->getFileSize();
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// Select the amount of padding alignment we need, based on either the next
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// sections alignment or the default alignment.
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//
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// FIXME: This should probably match the native word size.
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unsigned NextAlign = 4;
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++it;
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if (it != ie)
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NextAlign = it->getAlignment();
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// Layout the section fragments and its size.
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SD.setAddress(Address);
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LayoutSection(SD, NextAlign);
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Address += SD.getFileSize();
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}
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}
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// Write the object file.
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// Write the object file.
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87
test/MC/MachO/section-align-1.s
Normal file
87
test/MC/MachO/section-align-1.s
Normal file
@ -0,0 +1,87 @@
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// RUN: llvm-mc -triple i386-apple-darwin9 %s -filetype=obj -o - | macho-dump | FileCheck %s
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name:
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.byte 0
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// Check that symbol table is aligned to 4 bytes.
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// CHECK: ('cputype', 7)
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// CHECK: ('cpusubtype', 3)
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// CHECK: ('filetype', 1)
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// CHECK: ('num_load_commands', 1)
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// CHECK: ('load_commands_size', 228)
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// CHECK: ('flag', 0)
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// CHECK: ('load_commands', [
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// CHECK: # Load Command 0
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// CHECK: (('command', 1)
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// CHECK: ('size', 124)
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// CHECK: ('segment_name', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
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// CHECK: ('vm_addr', 0)
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// CHECK: ('vm_size', 1)
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// CHECK: ('file_offset', 256)
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// CHECK: ('file_size', 1)
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// CHECK: ('maxprot', 7)
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// CHECK: ('initprot', 7)
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// CHECK: ('num_sections', 1)
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// CHECK: ('flags', 0)
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// CHECK: ('sections', [
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// CHECK: # Section 0
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// CHECK: (('section_name', '__text\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
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// CHECK: ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
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// CHECK: ('address', 0)
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// CHECK: ('size', 1)
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// CHECK: ('offset', 256)
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// CHECK: ('alignment', 0)
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// CHECK: ('reloc_offset', 0)
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// CHECK: ('num_reloc', 0)
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// CHECK: ('flags', 0x80000000)
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// CHECK: ('reserved1', 0)
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// CHECK: ('reserved2', 0)
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// CHECK: ),
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// CHECK: ])
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// CHECK: ),
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// CHECK: # Load Command 1
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// CHECK: (('command', 2)
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// CHECK: ('size', 24)
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// CHECK: ('symoff', 260)
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// CHECK: ('nsyms', 1)
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// CHECK: ('stroff', 272)
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// CHECK: ('strsize', 8)
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// CHECK: ('_string_data', '\x00name\x00\x00\x00')
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// CHECK: ('_symbols', [
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// CHECK: # Symbol 0
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// CHECK: (('n_strx', 1)
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// CHECK: ('n_type', 0xe)
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// CHECK: ('n_sect', 1)
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// CHECK: ('n_desc', 0)
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// CHECK: ('n_value', 0)
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// CHECK: ('_string', 'name')
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// CHECK: ),
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// CHECK: ])
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// CHECK: ),
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// CHECK: # Load Command 2
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// CHECK: (('command', 11)
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// CHECK: ('size', 80)
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// CHECK: ('ilocalsym', 0)
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// CHECK: ('nlocalsym', 1)
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// CHECK: ('iextdefsym', 1)
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// CHECK: ('nextdefsym', 0)
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// CHECK: ('iundefsym', 1)
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// CHECK: ('nundefsym', 0)
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// CHECK: ('tocoff', 0)
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// CHECK: ('ntoc', 0)
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// CHECK: ('modtaboff', 0)
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// CHECK: ('nmodtab', 0)
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// CHECK: ('extrefsymoff', 0)
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// CHECK: ('nextrefsyms', 0)
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// CHECK: ('indirectsymoff', 0)
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// CHECK: ('nindirectsyms', 0)
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// CHECK: ('extreloff', 0)
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// CHECK: ('nextrel', 0)
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// CHECK: ('locreloff', 0)
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// CHECK: ('nlocrel', 0)
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// CHECK: ('_indirect_symbols', [
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// CHECK: ])
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// CHECK: ),
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// CHECK: ])
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137
test/MC/MachO/section-align-2.s
Normal file
137
test/MC/MachO/section-align-2.s
Normal file
@ -0,0 +1,137 @@
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// RUN: llvm-mc -triple i386-apple-darwin9 %s -filetype=obj -o - | macho-dump | FileCheck %s
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.byte 0
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// There should be 3 padding bytes here.
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.data
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.align 2
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foo:
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.org 8
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bar:
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|
.byte 0
|
||||||
|
|
||||||
|
.const
|
||||||
|
baz:
|
||||||
|
|
||||||
|
// CHECK: ('cputype', 7)
|
||||||
|
// CHECK: ('cpusubtype', 3)
|
||||||
|
// CHECK: ('filetype', 1)
|
||||||
|
// CHECK: ('num_load_commands', 1)
|
||||||
|
// CHECK: ('load_commands_size', 364)
|
||||||
|
// CHECK: ('flag', 0)
|
||||||
|
// CHECK: ('load_commands', [
|
||||||
|
// CHECK: # Load Command 0
|
||||||
|
// CHECK: (('command', 1)
|
||||||
|
// CHECK: ('size', 260)
|
||||||
|
// CHECK: ('segment_name', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('vm_addr', 0)
|
||||||
|
// CHECK: ('vm_size', 13)
|
||||||
|
// CHECK: ('file_offset', 392)
|
||||||
|
// CHECK: ('file_size', 13)
|
||||||
|
// CHECK: ('maxprot', 7)
|
||||||
|
// CHECK: ('initprot', 7)
|
||||||
|
// CHECK: ('num_sections', 3)
|
||||||
|
// CHECK: ('flags', 0)
|
||||||
|
// CHECK: ('sections', [
|
||||||
|
// CHECK: # Section 0
|
||||||
|
// CHECK: (('section_name', '__text\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('address', 0)
|
||||||
|
// CHECK: ('size', 1)
|
||||||
|
// CHECK: ('offset', 392)
|
||||||
|
// CHECK: ('alignment', 0)
|
||||||
|
// CHECK: ('reloc_offset', 0)
|
||||||
|
// CHECK: ('num_reloc', 0)
|
||||||
|
// CHECK: ('flags', 0x80000000)
|
||||||
|
// CHECK: ('reserved1', 0)
|
||||||
|
// CHECK: ('reserved2', 0)
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: # Section 1
|
||||||
|
// CHECK: (('section_name', '__data\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('address', 4)
|
||||||
|
// CHECK: ('size', 9)
|
||||||
|
// CHECK: ('offset', 396)
|
||||||
|
// CHECK: ('alignment', 2)
|
||||||
|
// CHECK: ('reloc_offset', 0)
|
||||||
|
// CHECK: ('num_reloc', 0)
|
||||||
|
// CHECK: ('flags', 0x0)
|
||||||
|
// CHECK: ('reserved1', 0)
|
||||||
|
// CHECK: ('reserved2', 0)
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: # Section 2
|
||||||
|
// CHECK: (('section_name', '__const\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('address', 13)
|
||||||
|
// CHECK: ('size', 0)
|
||||||
|
// CHECK: ('offset', 405)
|
||||||
|
// CHECK: ('alignment', 0)
|
||||||
|
// CHECK: ('reloc_offset', 0)
|
||||||
|
// CHECK: ('num_reloc', 0)
|
||||||
|
// CHECK: ('flags', 0x0)
|
||||||
|
// CHECK: ('reserved1', 0)
|
||||||
|
// CHECK: ('reserved2', 0)
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: ])
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: # Load Command 1
|
||||||
|
// CHECK: (('command', 2)
|
||||||
|
// CHECK: ('size', 24)
|
||||||
|
// CHECK: ('symoff', 408)
|
||||||
|
// CHECK: ('nsyms', 3)
|
||||||
|
// CHECK: ('stroff', 444)
|
||||||
|
// CHECK: ('strsize', 16)
|
||||||
|
// CHECK: ('_string_data', '\x00foo\x00bar\x00baz\x00\x00\x00\x00')
|
||||||
|
// CHECK: ('_symbols', [
|
||||||
|
// CHECK: # Symbol 0
|
||||||
|
// CHECK: (('n_strx', 1)
|
||||||
|
// CHECK: ('n_type', 0xe)
|
||||||
|
// CHECK: ('n_sect', 2)
|
||||||
|
// CHECK: ('n_desc', 0)
|
||||||
|
// CHECK: ('n_value', 4)
|
||||||
|
// CHECK: ('_string', 'foo')
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: # Symbol 1
|
||||||
|
// CHECK: (('n_strx', 5)
|
||||||
|
// CHECK: ('n_type', 0xe)
|
||||||
|
// CHECK: ('n_sect', 2)
|
||||||
|
// CHECK: ('n_desc', 0)
|
||||||
|
// CHECK: ('n_value', 12)
|
||||||
|
// CHECK: ('_string', 'bar')
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: # Symbol 2
|
||||||
|
// CHECK: (('n_strx', 9)
|
||||||
|
// CHECK: ('n_type', 0xe)
|
||||||
|
// CHECK: ('n_sect', 3)
|
||||||
|
// CHECK: ('n_desc', 0)
|
||||||
|
// CHECK: ('n_value', 13)
|
||||||
|
// CHECK: ('_string', 'baz')
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: ])
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: # Load Command 2
|
||||||
|
// CHECK: (('command', 11)
|
||||||
|
// CHECK: ('size', 80)
|
||||||
|
// CHECK: ('ilocalsym', 0)
|
||||||
|
// CHECK: ('nlocalsym', 3)
|
||||||
|
// CHECK: ('iextdefsym', 3)
|
||||||
|
// CHECK: ('nextdefsym', 0)
|
||||||
|
// CHECK: ('iundefsym', 3)
|
||||||
|
// CHECK: ('nundefsym', 0)
|
||||||
|
// CHECK: ('tocoff', 0)
|
||||||
|
// CHECK: ('ntoc', 0)
|
||||||
|
// CHECK: ('modtaboff', 0)
|
||||||
|
// CHECK: ('nmodtab', 0)
|
||||||
|
// CHECK: ('extrefsymoff', 0)
|
||||||
|
// CHECK: ('nextrefsyms', 0)
|
||||||
|
// CHECK: ('indirectsymoff', 0)
|
||||||
|
// CHECK: ('nindirectsyms', 0)
|
||||||
|
// CHECK: ('extreloff', 0)
|
||||||
|
// CHECK: ('nextrel', 0)
|
||||||
|
// CHECK: ('locreloff', 0)
|
||||||
|
// CHECK: ('nlocrel', 0)
|
||||||
|
// CHECK: ('_indirect_symbols', [
|
||||||
|
// CHECK: ])
|
||||||
|
// CHECK: ),
|
||||||
|
// CHECK: ])
|
Loading…
Reference in New Issue
Block a user