forked from OSchip/llvm-project
130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
//===-- MachOEmitter.h - Target-independent Mach-O Emitter class ----------===//
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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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#ifndef MACHOCODEEMITTER_H
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#define MACHOCODEEMITTER_H
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#include "MachOWriter.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include <vector>
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namespace llvm {
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/// MachOCodeEmitter - This class is used by the MachOWriter to emit the code
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/// for functions to the Mach-O file.
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class MachOCodeEmitter : public MachineCodeEmitter {
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MachOWriter &MOW;
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/// Target machine description.
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TargetMachine &TM;
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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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const TargetAsmInfo *TAI;
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/// Relocations - These are the relocations that the function needs, as
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/// emitted.
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std::vector<MachineRelocation> Relocations;
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/// CPLocations - This is a map of constant pool indices to offsets from the
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/// start of the section for that constant pool index.
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std::vector<uintptr_t> CPLocations;
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/// CPSections - This is a map of constant pool indices to the MachOSection
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/// containing the constant pool entry for that index.
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std::vector<unsigned> CPSections;
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/// JTLocations - This is a map of jump table indices to offsets from the
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/// start of the section for that jump table index.
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std::vector<uintptr_t> JTLocations;
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/// MBBLocations - This vector is a mapping from MBB ID's to their address.
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/// It is filled in by the StartMachineBasicBlock callback and queried by
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/// the getMachineBasicBlockAddress callback.
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std::vector<uintptr_t> MBBLocations;
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public:
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MachOCodeEmitter(MachOWriter &mow) : MOW(mow), TM(MOW.TM)
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{
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is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
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isLittleEndian = TM.getTargetData()->isLittleEndian();
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TAI = TM.getTargetAsmInfo();
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}
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virtual void startFunction(MachineFunction &MF);
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virtual bool finishFunction(MachineFunction &MF);
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virtual void addRelocation(const MachineRelocation &MR) {
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Relocations.push_back(MR);
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}
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void emitConstantPool(MachineConstantPool *MCP);
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void emitJumpTables(MachineJumpTableInfo *MJTI);
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virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const {
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assert(CPLocations.size() > Index && "CP not emitted!");
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return CPLocations[Index];
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}
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virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const {
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assert(JTLocations.size() > Index && "JT not emitted!");
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return JTLocations[Index];
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}
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virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {
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if (MBBLocations.size() <= (unsigned)MBB->getNumber())
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MBBLocations.resize((MBB->getNumber()+1)*2);
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MBBLocations[MBB->getNumber()] = getCurrentPCOffset();
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}
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virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
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assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
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MBBLocations[MBB->getNumber()] && "MBB not emitted!");
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return MBBLocations[MBB->getNumber()];
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}
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virtual uintptr_t getLabelAddress(uint64_t Label) const {
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assert(0 && "get Label not implemented");
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abort();
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return 0;
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}
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virtual void emitLabel(uint64_t LabelID) {
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assert(0 && "emit Label not implemented");
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abort();
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}
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virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) { }
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/// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
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virtual void startGVStub(const GlobalValue* F, unsigned StubSize,
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unsigned Alignment = 1) {
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assert(0 && "JIT specific function called!");
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abort();
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}
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virtual void startGVStub(const GlobalValue* F, void *Buffer,
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unsigned StubSize) {
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assert(0 && "JIT specific function called!");
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abort();
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}
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virtual void *finishGVStub(const GlobalValue* F) {
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assert(0 && "JIT specific function called!");
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abort();
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return 0;
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}
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}; // end class MachOCodeEmitter
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} // end namespace llvm
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#endif
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