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//===-- PPC32CodeEmitter.cpp - JIT Code Emitter for PowerPC32 -----*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the PowerPC 32-bit CodeEmitter and associated machinery to
// JIT-compile bytecode to native PowerPC.
//
//===----------------------------------------------------------------------===//
#include "PPC32JITInfo.h"
#include "PPC32TargetMachine.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
namespace llvm {
namespace {
class PPC32CodeEmitter : public MachineFunctionPass {
TargetMachine &TM;
MachineCodeEmitter &MCE;
int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
public:
PPC32CodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
: TM(T), MCE(M) {}
const char *getPassName() const { return "PowerPC Machine Code Emitter"; }
/// runOnMachineFunction - emits the given MachineFunction to memory
///
bool runOnMachineFunction(MachineFunction &MF);
/// emitBasicBlock - emits the given MachineBasicBlock to memory
///
void emitBasicBlock(MachineBasicBlock &MBB);
/// emitWord - write a 32-bit word to memory at the current PC
///
void emitWord(unsigned w) { MCE.emitWord(w); }
/// getValueBit - return the particular bit of Val
///
unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
/// getBinaryCodeForInstr - returns the assembled code for an instruction
///
unsigned getBinaryCodeForInstr(MachineInstr &MI);
};
}
/// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
/// machine code emitted. This uses a MachineCodeEmitter object to handle
/// actually outputting the machine code and resolving things like the address
/// of functions. This method should returns true if machine code emission is
/// not supported.
///
bool PPC32TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
MachineCodeEmitter &MCE) {
// Machine code emitter pass for PowerPC
PM.add(new PPC32CodeEmitter(*this, MCE));
// Delete machine code for this function after emitting it
PM.add(createMachineCodeDeleter());
return false;
}
bool PPC32CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
MCE.startFunction(MF);
MCE.emitConstantPool(MF.getConstantPool());
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
emitBasicBlock(*I);
MCE.finishFunction(MF);
return false;
}
void PPC32CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
emitWord(getBinaryCodeForInstr(*I));
}
int64_t PPC32CodeEmitter::getMachineOpValue(MachineInstr &MI,
MachineOperand &MO) {
int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
// or things that get fixed up later by the JIT.
if (MO.isPCRelativeDisp()) {
std::cerr << "PPC32CodeEmitter: PC-relative disp unhandled\n";
abort();
} else if (MO.isRegister()) {
rv = MO.getReg();
} else if (MO.isImmediate()) {
rv = MO.getImmedValue();
#if 0
} else if (MO.isGlobalAddress()) {
} else if (MO.isMachineBasicBlock()) {
MachineBasicBlock *MBB = MO.getMachineBasicBlock();
} else if (MO.isExternalSymbol()) {
} else if (MO.isFrameIndex()) {
unsigned index = MO.getFrameIndex();
} else if (MO.isConstantPoolIndex()) {
unsigned index = MO.getCosntantPoolIndex();
#endif
} else {
std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
abort();
}
return rv;
}
void *PPC32JITInfo::getJITStubForFunction(Function *F,
MachineCodeEmitter &MCE) {
std::cerr << "PPC32JITInfo::getJITStubForFunction not implemented\n";
abort();
return 0;
}
void PPC32JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
std::cerr << "PPC32JITInfo::replaceMachineCodeForFunction not implemented\n";
abort();
}
#include "PPC32GenCodeEmitter.inc"
} // end llvm namespace
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