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author | Daniel Dunbar <daniel@zuster.org> | 2010-03-19 09:28:55 +0000 |
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committer | Daniel Dunbar <daniel@zuster.org> | 2010-03-19 09:28:55 +0000 |
commit | bdd9281f356d326155dc2ca5585a708e09e90600 (patch) | |
tree | 40e49a642a996dfcf1bce6ba91ca79e6c2d4bcb7 /lib | |
parent | 87190c473c216e481e0a70475577e496b3a3449e (diff) | |
download | external_llvm-bdd9281f356d326155dc2ca5585a708e09e90600.zip external_llvm-bdd9281f356d326155dc2ca5585a708e09e90600.tar.gz external_llvm-bdd9281f356d326155dc2ca5585a708e09e90600.tar.bz2 |
MCAssembler: Pull out MCObjectWriter class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98948 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r-- | lib/MC/MCAssembler.cpp | 208 |
1 files changed, 126 insertions, 82 deletions
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp index c4c3a8a..ad42364 100644 --- a/lib/MC/MCAssembler.cpp +++ b/lib/MC/MCAssembler.cpp @@ -42,10 +42,9 @@ STATISTIC(EmittedFragments, "Number of emitted assembler fragments"); // object file, which may truncate it. We should detect that truncation where // invalid and report errors back. +class MCObjectWriter; static void WriteFileData(raw_ostream &OS, const MCSectionData &SD, - MachObjectWriter &MOW); - -static uint64_t WriteNopData(uint64_t Count, MachObjectWriter &MOW); + MCObjectWriter *MOW); /// isVirtualSection - Check if this is a section which does not actually exist /// in the object file. @@ -79,7 +78,106 @@ static bool isFixupKindPCRel(unsigned Kind) { } } -class MachObjectWriter { +class MCObjectWriter { + MCObjectWriter(const MCObjectWriter &); // DO NOT IMPLEMENT + void operator=(const MCObjectWriter &); // DO NOT IMPLEMENT + +protected: + raw_ostream &OS; + + unsigned IsLittleEndian : 1; + +protected: // Can only create subclasses. + MCObjectWriter(raw_ostream &_OS, bool _IsLittleEndian) + : OS(_OS), IsLittleEndian(_IsLittleEndian) {} + virtual ~MCObjectWriter(); + +public: + + bool isLittleEndian() { return IsLittleEndian; } + + raw_ostream &getStream() { return OS; } + + /// @name Binary Output Methods + /// @{ + + void Write8(uint8_t Value) { + OS << char(Value); + } + + void WriteLE16(uint16_t Value) { + Write8(uint8_t(Value >> 0)); + Write8(uint8_t(Value >> 8)); + } + + void WriteLE32(uint32_t Value) { + WriteLE16(uint16_t(Value >> 0)); + WriteLE16(uint16_t(Value >> 16)); + } + + void WriteLE64(uint64_t Value) { + WriteLE32(uint32_t(Value >> 0)); + WriteLE32(uint32_t(Value >> 32)); + } + + void WriteBE16(uint16_t Value) { + Write8(uint8_t(Value >> 8)); + Write8(uint8_t(Value >> 0)); + } + + void WriteBE32(uint32_t Value) { + WriteBE16(uint16_t(Value >> 16)); + WriteBE16(uint16_t(Value >> 0)); + } + + void WriteBE64(uint64_t Value) { + WriteBE32(uint32_t(Value >> 32)); + WriteBE32(uint32_t(Value >> 0)); + } + + void Write16(uint16_t Value) { + if (IsLittleEndian) + WriteLE16(Value); + else + WriteBE16(Value); + } + + void Write32(uint32_t Value) { + if (IsLittleEndian) + WriteLE32(Value); + else + WriteBE32(Value); + } + + void Write64(uint64_t Value) { + if (IsLittleEndian) + WriteLE64(Value); + else + WriteBE64(Value); + } + + void WriteZeros(unsigned N) { + const char Zeros[16] = { 0 }; + + for (unsigned i = 0, e = N / 16; i != e; ++i) + OS << StringRef(Zeros, 16); + + OS << StringRef(Zeros, N % 16); + } + + void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) { + OS << Str; + if (ZeroFillSize) + WriteZeros(ZeroFillSize - Str.size()); + } + + /// @} +}; + +MCObjectWriter::~MCObjectWriter() { +} + +class MachObjectWriter : public MCObjectWriter { // See <mach-o/loader.h>. enum { Header_Magic32 = 0xFEEDFACE, @@ -166,9 +264,7 @@ class MachObjectWriter { } }; - raw_ostream &OS; unsigned Is64Bit : 1; - unsigned IsLSB : 1; /// @name Relocation Data /// @{ @@ -192,64 +288,10 @@ class MachObjectWriter { /// @} public: - MachObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool _IsLSB = true) - : OS(_OS), Is64Bit(_Is64Bit), IsLSB(_IsLSB) { + MachObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool _IsLittleEndian = true) + : MCObjectWriter(_OS, _IsLittleEndian), Is64Bit(_Is64Bit) { } - /// @name Helper Methods - /// @{ - - void Write8(uint8_t Value) { - OS << char(Value); - } - - void Write16(uint16_t Value) { - if (IsLSB) { - Write8(uint8_t(Value >> 0)); - Write8(uint8_t(Value >> 8)); - } else { - Write8(uint8_t(Value >> 8)); - Write8(uint8_t(Value >> 0)); - } - } - - void Write32(uint32_t Value) { - if (IsLSB) { - Write16(uint16_t(Value >> 0)); - Write16(uint16_t(Value >> 16)); - } else { - Write16(uint16_t(Value >> 16)); - Write16(uint16_t(Value >> 0)); - } - } - - void Write64(uint64_t Value) { - if (IsLSB) { - Write32(uint32_t(Value >> 0)); - Write32(uint32_t(Value >> 32)); - } else { - Write32(uint32_t(Value >> 32)); - Write32(uint32_t(Value >> 0)); - } - } - - void WriteZeros(unsigned N) { - const char Zeros[16] = { 0 }; - - for (unsigned i = 0, e = N / 16; i != e; ++i) - OS << StringRef(Zeros, 16); - - OS << StringRef(Zeros, N % 16); - } - - void WriteString(StringRef Str, unsigned ZeroFillSize = 0) { - OS << Str; - if (ZeroFillSize) - WriteZeros(ZeroFillSize - Str.size()); - } - - /// @} - void WriteHeader(unsigned NumLoadCommands, unsigned LoadCommandsSize, bool SubsectionsViaSymbols) { uint32_t Flags = 0; @@ -300,7 +342,7 @@ public: Write32(SegmentLoadCommandSize + NumSections * (Is64Bit ? Section64Size : Section32Size)); - WriteString("", 16); + WriteBytes("", 16); if (Is64Bit) { Write64(0); // vmaddr Write64(VMSize); // vmsize @@ -337,8 +379,8 @@ public: // FIXME: cast<> support! const MCSectionMachO &Section = static_cast<const MCSectionMachO&>(SD.getSection()); - WriteString(Section.getSectionName(), 16); - WriteString(Section.getSegmentName(), 16); + WriteBytes(Section.getSectionName(), 16); + WriteBytes(Section.getSegmentName(), 16); if (Is64Bit) { Write64(SD.getAddress()); // address Write64(SD.getSize()); // size @@ -874,7 +916,7 @@ public: // Write the actual section data. for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it) - WriteFileData(OS, *it, *this); + WriteFileData(OS, *it, this); // Write the extra padding. WriteZeros(SectionDataPadding); @@ -1262,7 +1304,7 @@ void MCAssembler::LayoutSection(MCSectionData &SD) { /// the \arg Count is more than the maximum optimal nops. /// /// FIXME this is X86 32-bit specific and should move to a better place. -static uint64_t WriteNopData(uint64_t Count, MachObjectWriter &MOW) { +static uint64_t WriteNopData(uint64_t Count, MCObjectWriter *OW) { static const uint8_t Nops[16][16] = { // nop {0x90}, @@ -1310,14 +1352,14 @@ static uint64_t WriteNopData(uint64_t Count, MachObjectWriter &MOW) { return 0; for (uint64_t i = 0; i < Count; i++) - MOW.Write8 (uint8_t(Nops[Count - 1][i])); + OW->Write8(uint8_t(Nops[Count - 1][i])); return Count; } /// WriteFileData - Write the \arg F data to the output file. static void WriteFileData(raw_ostream &OS, const MCFragment &F, - MachObjectWriter &MOW) { + MCObjectWriter *OW) { uint64_t Start = OS.tell(); (void) Start; @@ -1342,7 +1384,7 @@ static void WriteFileData(raw_ostream &OS, const MCFragment &F, // the Count bytes. Then if that did not fill any bytes or there are any // bytes left to fill use the the Value and ValueSize to fill the rest. if (AF.getEmitNops()) { - uint64_t NopByteCount = WriteNopData(Count, MOW); + uint64_t NopByteCount = WriteNopData(Count, OW); Count -= NopByteCount; } @@ -1350,10 +1392,10 @@ static void WriteFileData(raw_ostream &OS, const MCFragment &F, switch (AF.getValueSize()) { default: assert(0 && "Invalid size!"); - case 1: MOW.Write8 (uint8_t (AF.getValue())); break; - case 2: MOW.Write16(uint16_t(AF.getValue())); break; - case 4: MOW.Write32(uint32_t(AF.getValue())); break; - case 8: MOW.Write64(uint64_t(AF.getValue())); break; + case 1: OW->Write8 (uint8_t (AF.getValue())); break; + case 2: OW->Write16(uint16_t(AF.getValue())); break; + case 4: OW->Write32(uint32_t(AF.getValue())); break; + case 8: OW->Write64(uint64_t(AF.getValue())); break; } } break; @@ -1370,10 +1412,10 @@ static void WriteFileData(raw_ostream &OS, const MCFragment &F, switch (FF.getValueSize()) { default: assert(0 && "Invalid size!"); - case 1: MOW.Write8 (uint8_t (FF.getValue())); break; - case 2: MOW.Write16(uint16_t(FF.getValue())); break; - case 4: MOW.Write32(uint32_t(FF.getValue())); break; - case 8: MOW.Write64(uint64_t(FF.getValue())); break; + case 1: OW->Write8 (uint8_t (FF.getValue())); break; + case 2: OW->Write16(uint16_t(FF.getValue())); break; + case 4: OW->Write32(uint32_t(FF.getValue())); break; + case 8: OW->Write64(uint64_t(FF.getValue())); break; } } break; @@ -1383,7 +1425,7 @@ static void WriteFileData(raw_ostream &OS, const MCFragment &F, MCOrgFragment &OF = cast<MCOrgFragment>(F); for (uint64_t i = 0, e = OF.getFileSize(); i != e; ++i) - MOW.Write8(uint8_t(OF.getValue())); + OW->Write8(uint8_t(OF.getValue())); break; } @@ -1399,7 +1441,7 @@ static void WriteFileData(raw_ostream &OS, const MCFragment &F, /// WriteFileData - Write the \arg SD data to the output file. static void WriteFileData(raw_ostream &OS, const MCSectionData &SD, - MachObjectWriter &MOW) { + MCObjectWriter *OW) { // Ignore virtual sections. if (isVirtualSection(SD.getSection())) { assert(SD.getFileSize() == 0); @@ -1411,11 +1453,11 @@ static void WriteFileData(raw_ostream &OS, const MCSectionData &SD, for (MCSectionData::const_iterator it = SD.begin(), ie = SD.end(); it != ie; ++it) - WriteFileData(OS, *it, MOW); + WriteFileData(OS, *it, OW); // Add section padding. assert(SD.getFileSize() >= SD.getSize() && "Invalid section sizes!"); - MOW.WriteZeros(SD.getFileSize() - SD.getSize()); + OW->WriteZeros(SD.getFileSize() - SD.getSize()); assert(OS.tell() - Start == SD.getFileSize()); } @@ -1442,6 +1484,8 @@ void MCAssembler::Finish() { MOW.ExecutePostLayoutBinding(*this); // Evaluate and apply the fixups, generating relocation entries as necessary. + // + // FIXME: Share layout object. MCAsmLayout Layout(*this); for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) { for (MCSectionData::iterator it2 = it->begin(), |