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9408fc6842
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 llvm-svn: 72754
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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