mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79898 91177308-0d34-0410-b5e6-96231b3b80d8
707 lines
21 KiB
C++
707 lines
21 KiB
C++
//===- lib/MC/MCAssembler.cpp - Assembler Backend Implementation ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/Target/TargetMachOWriterInfo.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include <vector>
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using namespace llvm;
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class MachObjectWriter;
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static void WriteFileData(raw_ostream &OS, const MCSectionData &SD,
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MachObjectWriter &MOW);
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class MachObjectWriter {
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// See <mach-o/loader.h>.
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enum {
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Header_Magic32 = 0xFEEDFACE,
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Header_Magic64 = 0xFEEDFACF
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};
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static const unsigned Header32Size = 28;
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static const unsigned Header64Size = 32;
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static const unsigned SegmentLoadCommand32Size = 56;
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static const unsigned Section32Size = 68;
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static const unsigned SymtabLoadCommandSize = 24;
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static const unsigned DysymtabLoadCommandSize = 80;
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static const unsigned Nlist32Size = 12;
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enum HeaderFileType {
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HFT_Object = 0x1
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};
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enum LoadCommandType {
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LCT_Segment = 0x1,
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LCT_Symtab = 0x2,
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LCT_Dysymtab = 0xb
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};
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// See <mach-o/nlist.h>.
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enum SymbolTypeType {
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STT_Undefined = 0x00,
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STT_Absolute = 0x02,
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STT_Section = 0x0e
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};
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enum SymbolTypeFlags {
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// If any of these bits are set, then the entry is a stab entry number (see
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// <mach-o/stab.h>. Otherwise the other masks apply.
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STF_StabsEntryMask = 0xe0,
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STF_TypeMask = 0x0e,
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STF_External = 0x01,
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STF_PrivateExtern = 0x10
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};
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/// MachSymbolData - Helper struct for containing some precomputed information
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/// on symbols.
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struct MachSymbolData {
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MCSymbolData *SymbolData;
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uint64_t StringIndex;
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uint8_t SectionIndex;
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// Support lexicographic sorting.
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bool operator<(const MachSymbolData &RHS) const {
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const std::string &Name = SymbolData->getSymbol().getName();
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return Name < RHS.SymbolData->getSymbol().getName();
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}
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};
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raw_ostream &OS;
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bool IsLSB;
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public:
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MachObjectWriter(raw_ostream &_OS, bool _IsLSB = true)
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: OS(_OS), IsLSB(_IsLSB) {
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}
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/// @name Helper Methods
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/// @{
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void Write8(uint8_t Value) {
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OS << char(Value);
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}
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void Write16(uint16_t Value) {
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if (IsLSB) {
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Write8(uint8_t(Value >> 0));
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Write8(uint8_t(Value >> 8));
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} else {
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Write8(uint8_t(Value >> 8));
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Write8(uint8_t(Value >> 0));
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}
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}
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void Write32(uint32_t Value) {
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if (IsLSB) {
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Write16(uint16_t(Value >> 0));
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Write16(uint16_t(Value >> 16));
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} else {
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Write16(uint16_t(Value >> 16));
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Write16(uint16_t(Value >> 0));
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}
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}
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void Write64(uint64_t Value) {
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if (IsLSB) {
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Write32(uint32_t(Value >> 0));
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Write32(uint32_t(Value >> 32));
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} else {
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Write32(uint32_t(Value >> 32));
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Write32(uint32_t(Value >> 0));
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}
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}
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void WriteZeros(unsigned N) {
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const char Zeros[16] = { 0 };
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for (unsigned i = 0, e = N / 16; i != e; ++i)
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OS << StringRef(Zeros, 16);
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OS << StringRef(Zeros, N % 16);
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}
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void WriteString(const StringRef &Str, unsigned ZeroFillSize = 0) {
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OS << Str;
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if (ZeroFillSize)
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WriteZeros(ZeroFillSize - Str.size());
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}
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/// @}
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void WriteHeader32(unsigned NumLoadCommands, unsigned LoadCommandsSize) {
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// struct mach_header (28 bytes)
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uint64_t Start = OS.tell();
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(void) Start;
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Write32(Header_Magic32);
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// FIXME: Support cputype.
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Write32(TargetMachOWriterInfo::HDR_CPU_TYPE_I386);
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// FIXME: Support cpusubtype.
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Write32(TargetMachOWriterInfo::HDR_CPU_SUBTYPE_I386_ALL);
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Write32(HFT_Object);
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// Object files have a single load command, the segment.
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Write32(NumLoadCommands);
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Write32(LoadCommandsSize);
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Write32(0); // Flags
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assert(OS.tell() - Start == Header32Size);
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}
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/// WriteSegmentLoadCommand32 - Write a 32-bit segment load command.
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///
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/// \arg NumSections - The number of sections in this segment.
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/// \arg SectionDataSize - The total size of the sections.
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void WriteSegmentLoadCommand32(unsigned NumSections,
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uint64_t SectionDataStartOffset,
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uint64_t SectionDataSize) {
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// struct segment_command (56 bytes)
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uint64_t Start = OS.tell();
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(void) Start;
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Write32(LCT_Segment);
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Write32(SegmentLoadCommand32Size + NumSections * Section32Size);
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WriteString("", 16);
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Write32(0); // vmaddr
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Write32(SectionDataSize); // vmsize
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Write32(SectionDataStartOffset); // file offset
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Write32(SectionDataSize); // file size
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Write32(0x7); // maxprot
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Write32(0x7); // initprot
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Write32(NumSections);
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Write32(0); // flags
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assert(OS.tell() - Start == SegmentLoadCommand32Size);
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}
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void WriteSection32(const MCSectionData &SD, uint64_t FileOffset) {
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// struct section (68 bytes)
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uint64_t Start = OS.tell();
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(void) Start;
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// FIXME: cast<> support!
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const MCSectionMachO &Section =
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static_cast<const MCSectionMachO&>(SD.getSection());
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WriteString(Section.getSectionName(), 16);
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WriteString(Section.getSegmentName(), 16);
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Write32(0); // address
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Write32(SD.getFileSize()); // size
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Write32(FileOffset);
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assert(isPowerOf2_32(SD.getAlignment()) && "Invalid alignment!");
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Write32(Log2_32(SD.getAlignment()));
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Write32(0); // file offset of relocation entries
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Write32(0); // number of relocation entrions
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Write32(Section.getTypeAndAttributes());
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Write32(0); // reserved1
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Write32(Section.getStubSize()); // reserved2
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assert(OS.tell() - Start == Section32Size);
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}
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void WriteSymtabLoadCommand(uint32_t SymbolOffset, uint32_t NumSymbols,
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uint32_t StringTableOffset,
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uint32_t StringTableSize) {
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// struct symtab_command (24 bytes)
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uint64_t Start = OS.tell();
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(void) Start;
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Write32(LCT_Symtab);
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Write32(SymtabLoadCommandSize);
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Write32(SymbolOffset);
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Write32(NumSymbols);
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Write32(StringTableOffset);
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Write32(StringTableSize);
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assert(OS.tell() - Start == SymtabLoadCommandSize);
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}
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void WriteDysymtabLoadCommand(uint32_t FirstLocalSymbol,
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uint32_t NumLocalSymbols,
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uint32_t FirstExternalSymbol,
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uint32_t NumExternalSymbols,
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uint32_t FirstUndefinedSymbol,
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uint32_t NumUndefinedSymbols,
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uint32_t IndirectSymbolOffset,
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uint32_t NumIndirectSymbols) {
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// struct dysymtab_command (80 bytes)
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uint64_t Start = OS.tell();
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(void) Start;
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Write32(LCT_Dysymtab);
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Write32(DysymtabLoadCommandSize);
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Write32(FirstLocalSymbol);
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Write32(NumLocalSymbols);
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Write32(FirstExternalSymbol);
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Write32(NumExternalSymbols);
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Write32(FirstUndefinedSymbol);
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Write32(NumUndefinedSymbols);
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Write32(0); // tocoff
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Write32(0); // ntoc
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Write32(0); // modtaboff
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Write32(0); // nmodtab
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Write32(0); // extrefsymoff
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Write32(0); // nextrefsyms
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Write32(IndirectSymbolOffset);
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Write32(NumIndirectSymbols);
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Write32(0); // extreloff
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Write32(0); // nextrel
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Write32(0); // locreloff
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Write32(0); // nlocrel
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assert(OS.tell() - Start == DysymtabLoadCommandSize);
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}
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void WriteNlist32(MachSymbolData &MSD) {
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MCSymbol &Symbol = MSD.SymbolData->getSymbol();
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uint8_t Type = 0;
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// Set the N_TYPE bits. See <mach-o/nlist.h>.
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//
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// FIXME: Are the prebound or indirect fields possible here?
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if (Symbol.isUndefined())
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Type = STT_Undefined;
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else if (Symbol.isAbsolute())
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Type = STT_Absolute;
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else
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Type = STT_Section;
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// FIXME: Set STAB bits.
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// FIXME: Set private external bit.
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// Set external bit.
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if (MSD.SymbolData->isExternal() || Symbol.isUndefined())
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Type |= STF_External;
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// struct nlist (12 bytes)
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Write32(MSD.StringIndex);
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Write8(Type);
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Write8(MSD.SectionIndex);
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Write16(0); // FIXME: Desc
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Write32(0); // FIXME: Value
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}
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/// ComputeSymbolTable - Compute the symbol table data
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///
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/// \param StringTable [out] - The string table data.
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/// \param StringIndexMap [out] - Map from symbol names to offsets in the
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/// string table.
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void ComputeSymbolTable(MCAssembler &Asm, SmallString<256> &StringTable,
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std::vector<MachSymbolData> &LocalSymbolData,
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std::vector<MachSymbolData> &ExternalSymbolData,
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std::vector<MachSymbolData> &UndefinedSymbolData) {
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// Build section lookup table.
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DenseMap<const MCSection*, uint8_t> SectionIndexMap;
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unsigned Index = 1;
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for (MCAssembler::iterator it = Asm.begin(),
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ie = Asm.end(); it != ie; ++it, ++Index)
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SectionIndexMap[&it->getSection()] = Index;
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assert(Index <= 256 && "Too many sections!");
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// Index 0 is always the empty string.
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StringMap<uint64_t> StringIndexMap;
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StringTable += '\x00';
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// Build the symbol arrays and the string table, but only for non-local
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// symbols.
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//
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// The particular order that we collect the symbols and create the string
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// table, then sort the symbols is chosen to match 'as'. Even though it
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// doesn't matter for correctness, this is important for letting us diff .o
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// files.
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for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
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ie = Asm.symbol_end(); it != ie; ++it) {
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MCSymbol &Symbol = it->getSymbol();
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if (!it->isExternal() && !Symbol.isUndefined())
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continue;
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uint64_t &Entry = StringIndexMap[Symbol.getName()];
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if (!Entry) {
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Entry = StringTable.size();
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StringTable += Symbol.getName();
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StringTable += '\x00';
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}
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MachSymbolData MSD;
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MSD.SymbolData = it;
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MSD.StringIndex = Entry;
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if (Symbol.isUndefined()) {
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MSD.SectionIndex = 0;
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UndefinedSymbolData.push_back(MSD);
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} else if (Symbol.isAbsolute()) {
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MSD.SectionIndex = 0;
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ExternalSymbolData.push_back(MSD);
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} else {
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MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection());
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assert(MSD.SectionIndex && "Invalid section index!");
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ExternalSymbolData.push_back(MSD);
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}
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}
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// Now add the data for local symbols.
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for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
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ie = Asm.symbol_end(); it != ie; ++it) {
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MCSymbol &Symbol = it->getSymbol();
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if (it->isExternal() || Symbol.isUndefined())
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continue;
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uint64_t &Entry = StringIndexMap[Symbol.getName()];
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if (!Entry) {
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Entry = StringTable.size();
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StringTable += Symbol.getName();
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StringTable += '\x00';
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}
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MachSymbolData MSD;
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MSD.SymbolData = it;
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MSD.StringIndex = Entry;
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if (Symbol.isAbsolute()) {
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MSD.SectionIndex = 0;
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LocalSymbolData.push_back(MSD);
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} else {
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MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection());
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assert(MSD.SectionIndex && "Invalid section index!");
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LocalSymbolData.push_back(MSD);
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}
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}
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// External and undefined symbols are required to be in lexicographic order.
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std::sort(ExternalSymbolData.begin(), ExternalSymbolData.end());
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std::sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end());
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// The string table is padded to a multiple of 4.
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//
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// FIXME: Check to see if this varies per arch.
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while (StringTable.size() % 4)
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StringTable += '\x00';
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}
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void WriteObject(MCAssembler &Asm) {
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unsigned NumSections = Asm.size();
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// Compute symbol table information.
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SmallString<256> StringTable;
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std::vector<MachSymbolData> LocalSymbolData;
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std::vector<MachSymbolData> ExternalSymbolData;
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std::vector<MachSymbolData> UndefinedSymbolData;
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unsigned NumSymbols = Asm.symbol_size();
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// No symbol table command is written if there are no symbols.
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if (NumSymbols)
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ComputeSymbolTable(Asm, StringTable, LocalSymbolData, ExternalSymbolData,
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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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// section headers) and the symbol table.
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unsigned NumLoadCommands = 1;
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uint64_t LoadCommandsSize =
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SegmentLoadCommand32Size + NumSections * Section32Size;
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// Add the symbol table load command sizes, if used.
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if (NumSymbols) {
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NumLoadCommands += 2;
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LoadCommandsSize += SymtabLoadCommandSize + DysymtabLoadCommandSize;
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}
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uint64_t FileOffset = Header32Size + LoadCommandsSize;
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uint64_t SectionDataStartOffset = FileOffset;
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uint64_t SectionDataSize = 0;
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unsigned Index = 0;
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for (MCAssembler::iterator it = Asm.begin(),
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ie = Asm.end(); it != ie; ++it, ++Index) {
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SectionFileOffsets[Index] = FileOffset;
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FileOffset += it->getFileSize();
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SectionDataSize += it->getFileSize();
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}
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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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WriteSegmentLoadCommand32(NumSections, SectionDataStartOffset,
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SectionDataSize);
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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(),
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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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if (NumSymbols) {
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// The string table is written after all the section data.
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uint64_t SymbolTableOffset = SectionDataStartOffset + SectionDataSize;
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uint64_t StringTableOffset =
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SymbolTableOffset + NumSymbols * Nlist32Size;
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WriteSymtabLoadCommand(SymbolTableOffset, NumSymbols,
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StringTableOffset, StringTable.size());
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unsigned FirstLocalSymbol = 0;
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unsigned NumLocalSymbols = LocalSymbolData.size();
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unsigned FirstExternalSymbol = FirstLocalSymbol + NumLocalSymbols;
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unsigned NumExternalSymbols = ExternalSymbolData.size();
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unsigned FirstUndefinedSymbol = FirstExternalSymbol + NumExternalSymbols;
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unsigned NumUndefinedSymbols = UndefinedSymbolData.size();
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// FIXME: Get correct symbol indices and counts for indirect symbols.
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unsigned IndirectSymbolOffset = 0;
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unsigned NumIndirectSymbols = 0;
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WriteDysymtabLoadCommand(FirstLocalSymbol, NumLocalSymbols,
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FirstExternalSymbol, NumExternalSymbols,
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FirstUndefinedSymbol, NumUndefinedSymbols,
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IndirectSymbolOffset, NumIndirectSymbols);
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}
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// Write the actual section data.
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for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
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WriteFileData(OS, *it, *this);
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// Write the symbol table data, if used.
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if (NumSymbols) {
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// FIXME: Check that offsets match computed ones.
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// FIXME: Some of these are ordered by name to help the linker.
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// Write the symbol table entries.
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for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i)
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WriteNlist32(LocalSymbolData[i]);
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for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i)
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WriteNlist32(ExternalSymbolData[i]);
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for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
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WriteNlist32(UndefinedSymbolData[i]);
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// Write the string table.
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OS << StringTable.str();
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}
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}
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};
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/* *** */
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MCFragment::MCFragment() : Kind(FragmentType(~0)) {
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}
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MCFragment::MCFragment(FragmentType _Kind, MCSectionData *SD)
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: Kind(_Kind),
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FileSize(~UINT64_C(0))
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|
{
|
|
if (SD)
|
|
SD->getFragmentList().push_back(this);
|
|
}
|
|
|
|
MCFragment::~MCFragment() {
|
|
}
|
|
|
|
/* *** */
|
|
|
|
MCSectionData::MCSectionData() : Section(*(MCSection*)0) {}
|
|
|
|
MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
|
|
: Section(_Section),
|
|
Alignment(1),
|
|
FileSize(~UINT64_C(0))
|
|
{
|
|
if (A)
|
|
A->getSectionList().push_back(this);
|
|
}
|
|
|
|
/* *** */
|
|
|
|
MCSymbolData::MCSymbolData() : Symbol(*(MCSymbol*)0) {}
|
|
|
|
MCSymbolData::MCSymbolData(MCSymbol &_Symbol, MCFragment *_Fragment,
|
|
uint64_t _Offset, MCAssembler *A)
|
|
: Symbol(_Symbol), Fragment(_Fragment), Offset(_Offset),
|
|
IsExternal(false)
|
|
{
|
|
if (A)
|
|
A->getSymbolList().push_back(this);
|
|
}
|
|
|
|
/* *** */
|
|
|
|
MCAssembler::MCAssembler(raw_ostream &_OS) : OS(_OS) {}
|
|
|
|
MCAssembler::~MCAssembler() {
|
|
}
|
|
|
|
void MCAssembler::LayoutSection(MCSectionData &SD) {
|
|
uint64_t Offset = 0;
|
|
|
|
for (MCSectionData::iterator it = SD.begin(), ie = SD.end(); it != ie; ++it) {
|
|
MCFragment &F = *it;
|
|
|
|
F.setOffset(Offset);
|
|
|
|
// Evaluate fragment size.
|
|
switch (F.getKind()) {
|
|
case MCFragment::FT_Align: {
|
|
MCAlignFragment &AF = cast<MCAlignFragment>(F);
|
|
|
|
uint64_t AlignedOffset = RoundUpToAlignment(Offset, AF.getAlignment());
|
|
uint64_t PaddingBytes = AlignedOffset - Offset;
|
|
|
|
if (PaddingBytes > AF.getMaxBytesToEmit())
|
|
AF.setFileSize(0);
|
|
else
|
|
AF.setFileSize(PaddingBytes);
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_Data:
|
|
case MCFragment::FT_Fill:
|
|
F.setFileSize(F.getMaxFileSize());
|
|
break;
|
|
|
|
case MCFragment::FT_Org: {
|
|
MCOrgFragment &OF = cast<MCOrgFragment>(F);
|
|
|
|
if (!OF.getOffset().isAbsolute())
|
|
llvm_unreachable("FIXME: Not yet implemented!");
|
|
uint64_t OrgOffset = OF.getOffset().getConstant();
|
|
|
|
// FIXME: We need a way to communicate this error.
|
|
if (OrgOffset < Offset)
|
|
llvm_report_error("invalid .org offset '" + Twine(OrgOffset) +
|
|
"' (section offset '" + Twine(Offset) + "'");
|
|
|
|
F.setFileSize(OrgOffset - Offset);
|
|
break;
|
|
}
|
|
}
|
|
|
|
Offset += F.getFileSize();
|
|
}
|
|
|
|
// FIXME: Pad section?
|
|
SD.setFileSize(Offset);
|
|
}
|
|
|
|
/// WriteFileData - Write the \arg F data to the output file.
|
|
static void WriteFileData(raw_ostream &OS, const MCFragment &F,
|
|
MachObjectWriter &MOW) {
|
|
uint64_t Start = OS.tell();
|
|
(void) Start;
|
|
|
|
// FIXME: Embed in fragments instead?
|
|
switch (F.getKind()) {
|
|
case MCFragment::FT_Align: {
|
|
MCAlignFragment &AF = cast<MCAlignFragment>(F);
|
|
uint64_t Count = AF.getFileSize() / AF.getValueSize();
|
|
|
|
// FIXME: This error shouldn't actually occur (the front end should emit
|
|
// multiple .align directives to enforce the semantics it wants), but is
|
|
// severe enough that we want to report it. How to handle this?
|
|
if (Count * AF.getValueSize() != AF.getFileSize())
|
|
llvm_report_error("undefined .align directive, value size '" +
|
|
Twine(AF.getValueSize()) +
|
|
"' is not a divisor of padding size '" +
|
|
Twine(AF.getFileSize()) + "'");
|
|
|
|
for (uint64_t i = 0; i != Count; ++i) {
|
|
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;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_Data:
|
|
OS << cast<MCDataFragment>(F).getContents().str();
|
|
break;
|
|
|
|
case MCFragment::FT_Fill: {
|
|
MCFillFragment &FF = cast<MCFillFragment>(F);
|
|
|
|
if (!FF.getValue().isAbsolute())
|
|
llvm_unreachable("FIXME: Not yet implemented!");
|
|
int64_t Value = FF.getValue().getConstant();
|
|
|
|
for (uint64_t i = 0, e = FF.getCount(); i != e; ++i) {
|
|
switch (FF.getValueSize()) {
|
|
default:
|
|
assert(0 && "Invalid size!");
|
|
case 1: MOW.Write8 (uint8_t (Value)); break;
|
|
case 2: MOW.Write16(uint16_t(Value)); break;
|
|
case 4: MOW.Write32(uint32_t(Value)); break;
|
|
case 8: MOW.Write64(uint64_t(Value)); break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_Org: {
|
|
MCOrgFragment &OF = cast<MCOrgFragment>(F);
|
|
|
|
for (uint64_t i = 0, e = OF.getFileSize(); i != e; ++i)
|
|
MOW.Write8(uint8_t(OF.getValue()));
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
assert(OS.tell() - Start == F.getFileSize());
|
|
}
|
|
|
|
/// WriteFileData - Write the \arg SD data to the output file.
|
|
static void WriteFileData(raw_ostream &OS, const MCSectionData &SD,
|
|
MachObjectWriter &MOW) {
|
|
uint64_t Start = OS.tell();
|
|
(void) Start;
|
|
|
|
for (MCSectionData::const_iterator it = SD.begin(),
|
|
ie = SD.end(); it != ie; ++it)
|
|
WriteFileData(OS, *it, MOW);
|
|
|
|
assert(OS.tell() - Start == SD.getFileSize());
|
|
}
|
|
|
|
void MCAssembler::Finish() {
|
|
// Layout the sections and fragments.
|
|
for (iterator it = begin(), ie = end(); it != ie; ++it)
|
|
LayoutSection(*it);
|
|
|
|
// Write the object file.
|
|
MachObjectWriter MOW(OS);
|
|
MOW.WriteObject(*this);
|
|
|
|
OS.flush();
|
|
}
|