mirror of
https://github.com/c64scene-ar/llvm-6502.git
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a321dcd38d
one new .cpp file, in preparation for merging in the Direct Object Emission changes we're working on. No functional changes. Fixed coding style issues on the original patch. Patch by Aaron Gray git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72754 91177308-0d34-0410-b5e6-96231b3b80d8
264 lines
8.9 KiB
C++
264 lines
8.9 KiB
C++
//=== MachOWriter.h - Target-independent Mach-O writer support --*- C++ -*-===//
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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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//
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// This file defines the MachOWriter class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MACHOWRITER_H
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#define MACHOWRITER_H
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#include "MachO.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachOWriterInfo.h"
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#include <map>
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namespace llvm {
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class GlobalVariable;
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class Mangler;
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class MachineCodeEmitter;
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class MachOCodeEmitter;
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class OutputBuffer;
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class raw_ostream;
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/// MachOWriter - This class implements the common target-independent code for
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/// writing Mach-O files. Targets should derive a class from this to
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/// parameterize the output format.
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///
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class MachOWriter : public MachineFunctionPass {
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friend class MachOCodeEmitter;
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public:
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static char ID;
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MachineCodeEmitter &getMachineCodeEmitter() const {
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return *(MachineCodeEmitter*)MCE;
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}
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MachOWriter(raw_ostream &O, TargetMachine &TM);
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virtual ~MachOWriter();
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virtual const char *getPassName() const {
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return "Mach-O Writer";
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}
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protected:
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/// Output stream to send the resultant object file to.
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///
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raw_ostream &O;
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/// Target machine description.
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///
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TargetMachine &TM;
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/// Mang - The object used to perform name mangling for this module.
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///
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Mangler *Mang;
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/// MCE - The MachineCodeEmitter object that we are exposing to emit machine
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/// code for functions to the .o file.
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MachOCodeEmitter *MCE;
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/// is64Bit/isLittleEndian - This information is inferred from the target
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/// machine directly, indicating what header values and flags to set.
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bool is64Bit, isLittleEndian;
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// Target Asm Info
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const TargetAsmInfo *TAI;
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/// Header - An instance of MachOHeader that we will update while we build
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/// the file, and then emit during finalization.
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MachOHeader Header;
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/// doInitialization - Emit the file header and all of the global variables
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/// for the module to the Mach-O file.
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bool doInitialization(Module &M);
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bool runOnMachineFunction(MachineFunction &MF);
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/// doFinalization - Now that the module has been completely processed, emit
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/// the Mach-O file to 'O'.
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bool doFinalization(Module &M);
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private:
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/// SectionList - This is the list of sections that we have emitted to the
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/// file. Once the file has been completely built, the segment load command
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/// SectionCommands are constructed from this info.
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std::vector<MachOSection*> SectionList;
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/// SectionLookup - This is a mapping from section name to SectionList entry
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std::map<std::string, MachOSection*> SectionLookup;
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/// GVSection - This is a mapping from a GlobalValue to a MachOSection,
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/// to aid in emitting relocations.
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std::map<GlobalValue*, MachOSection*> GVSection;
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/// GVOffset - This is a mapping from a GlobalValue to an offset from the
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/// start of the section in which the GV resides, to aid in emitting
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/// relocations.
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std::map<GlobalValue*, intptr_t> GVOffset;
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/// getSection - Return the section with the specified name, creating a new
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/// section if one does not already exist.
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MachOSection *getSection(const std::string &seg, const std::string §,
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unsigned Flags = 0) {
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MachOSection *MOS = SectionLookup[seg+sect];
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if (MOS) return MOS;
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MOS = new MachOSection(seg, sect);
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SectionList.push_back(MOS);
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MOS->Index = SectionList.size();
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MOS->flags = MachOSection::S_REGULAR | Flags;
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SectionLookup[seg+sect] = MOS;
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return MOS;
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}
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MachOSection *getTextSection(bool isCode = true) {
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if (isCode)
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return getSection("__TEXT", "__text",
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MachOSection::S_ATTR_PURE_INSTRUCTIONS |
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MachOSection::S_ATTR_SOME_INSTRUCTIONS);
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else
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return getSection("__TEXT", "__text");
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}
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MachOSection *getBSSSection() {
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return getSection("__DATA", "__bss", MachOSection::S_ZEROFILL);
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}
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MachOSection *getDataSection() {
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return getSection("__DATA", "__data");
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}
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MachOSection *getConstSection(Constant *C) {
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const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
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if (CVA && CVA->isCString())
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return getSection("__TEXT", "__cstring",
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MachOSection::S_CSTRING_LITERALS);
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const Type *Ty = C->getType();
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if (Ty->isPrimitiveType() || Ty->isInteger()) {
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unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
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switch(Size) {
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default: break; // Fall through to __TEXT,__const
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case 4:
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return getSection("__TEXT", "__literal4",
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MachOSection::S_4BYTE_LITERALS);
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case 8:
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return getSection("__TEXT", "__literal8",
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MachOSection::S_8BYTE_LITERALS);
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case 16:
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return getSection("__TEXT", "__literal16",
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MachOSection::S_16BYTE_LITERALS);
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}
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}
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return getSection("__TEXT", "__const");
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}
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MachOSection *getJumpTableSection() {
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if (TM.getRelocationModel() == Reloc::PIC_)
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return getTextSection(false);
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else
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return getSection("__TEXT", "__const");
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}
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/// MachOSymTab - This struct contains information about the offsets and
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/// size of symbol table information.
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/// segment.
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struct MachOSymTab {
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uint32_t cmd; // LC_SYMTAB
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uint32_t cmdsize; // sizeof( MachOSymTab )
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uint32_t symoff; // symbol table offset
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uint32_t nsyms; // number of symbol table entries
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uint32_t stroff; // string table offset
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uint32_t strsize; // string table size in bytes
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// Constants for the cmd field
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// see <mach-o/loader.h>
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enum { LC_SYMTAB = 0x02 // link-edit stab symbol table info
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};
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MachOSymTab() : cmd(LC_SYMTAB), cmdsize(6 * sizeof(uint32_t)), symoff(0),
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nsyms(0), stroff(0), strsize(0) { }
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};
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/// SymTab - The "stab" style symbol table information
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MachOSymTab SymTab;
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/// DySymTab - symbol table info for the dynamic link editor
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MachODySymTab DySymTab;
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protected:
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/// SymbolTable - This is the list of symbols we have emitted to the file.
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/// This actually gets rearranged before emission to the file (to put the
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/// local symbols first in the list).
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std::vector<MachOSym> SymbolTable;
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/// SymT - A buffer to hold the symbol table before we write it out at the
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/// appropriate location in the file.
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DataBuffer SymT;
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/// StrT - A buffer to hold the string table before we write it out at the
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/// appropriate location in the file.
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DataBuffer StrT;
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/// PendingSyms - This is a list of externally defined symbols that we have
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/// been asked to emit, but have not seen a reference to. When a reference
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/// is seen, the symbol will move from this list to the SymbolTable.
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std::vector<GlobalValue*> PendingGlobals;
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/// DynamicSymbolTable - This is just a vector of indices into
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/// SymbolTable to aid in emitting the DYSYMTAB load command.
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std::vector<unsigned> DynamicSymbolTable;
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static void InitMem(const Constant *C, void *Addr, intptr_t Offset,
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const TargetData *TD,
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std::vector<MachineRelocation> &MRs);
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private:
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void AddSymbolToSection(MachOSection *MOS, GlobalVariable *GV);
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void EmitGlobal(GlobalVariable *GV);
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void EmitHeaderAndLoadCommands();
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void EmitSections();
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void EmitRelocations();
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void BufferSymbolAndStringTable();
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void CalculateRelocations(MachOSection &MOS);
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MachineRelocation GetJTRelocation(unsigned Offset,
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MachineBasicBlock *MBB) const {
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return TM.getMachOWriterInfo()->GetJTRelocation(Offset, MBB);
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}
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/// GetTargetRelocation - Returns the number of relocations.
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unsigned GetTargetRelocation(MachineRelocation &MR,
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unsigned FromIdx,
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unsigned ToAddr,
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unsigned ToIndex,
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OutputBuffer &RelocOut,
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OutputBuffer &SecOut,
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bool Scattered,
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bool Extern) {
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return TM.getMachOWriterInfo()->GetTargetRelocation(MR, FromIdx, ToAddr,
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ToIndex, RelocOut,
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SecOut, Scattered,
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Extern);
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}
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};
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}
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#endif
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