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