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c982cfad87
addPassesToEmitMachineCode()
* Add support for registers and constants in getMachineOpValue()
This enables running "int main() { ret 0 }" via the PowerPC JIT.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16983 91177308-0d34-0410-b5e6-96231b3b80d8
134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
//===-- PPC32CodeEmitter.cpp - JIT Code Emitter for PowerPC32 -----*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 PowerPC 32-bit CodeEmitter and associated machinery to
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// JIT-compile bytecode to native PowerPC.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC32JITInfo.h"
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#include "PPC32TargetMachine.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/Debug.h"
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namespace llvm {
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namespace {
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class PPC32CodeEmitter : public MachineFunctionPass {
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TargetMachine &TM;
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MachineCodeEmitter &MCE;
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int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
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public:
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PPC32CodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
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: TM(T), MCE(M) {}
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const char *getPassName() const { return "PowerPC Machine Code Emitter"; }
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/// runOnMachineFunction - emits the given MachineFunction to memory
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///
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bool runOnMachineFunction(MachineFunction &MF);
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/// emitBasicBlock - emits the given MachineBasicBlock to memory
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///
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void emitBasicBlock(MachineBasicBlock &MBB);
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/// emitWord - write a 32-bit word to memory at the current PC
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///
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void emitWord(unsigned w) { MCE.emitWord(w); }
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/// getValueBit - return the particular bit of Val
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///
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unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
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/// getBinaryCodeForInstr - returns the assembled code for an instruction
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///
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unsigned getBinaryCodeForInstr(MachineInstr &MI);
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};
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}
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/// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
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/// machine code emitted. This uses a MachineCodeEmitter object to handle
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/// actually outputting the machine code and resolving things like the address
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/// of functions. This method should returns true if machine code emission is
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/// not supported.
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///
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bool PPC32TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
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MachineCodeEmitter &MCE) {
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// Machine code emitter pass for PowerPC
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PM.add(new PPC32CodeEmitter(*this, MCE));
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// Delete machine code for this function after emitting it
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PM.add(createMachineCodeDeleter());
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return false;
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}
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bool PPC32CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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MCE.startFunction(MF);
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MCE.emitConstantPool(MF.getConstantPool());
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for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
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emitBasicBlock(*I);
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MCE.finishFunction(MF);
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return false;
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}
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void PPC32CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
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emitWord(getBinaryCodeForInstr(*I));
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}
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int64_t PPC32CodeEmitter::getMachineOpValue(MachineInstr &MI,
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MachineOperand &MO) {
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int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
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// or things that get fixed up later by the JIT.
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if (MO.isPCRelativeDisp()) {
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std::cerr << "PPC32CodeEmitter: PC-relative disp unhandled\n";
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abort();
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} else if (MO.isRegister()) {
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rv = MO.getReg();
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} else if (MO.isImmediate()) {
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rv = MO.getImmedValue();
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#if 0
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} else if (MO.isGlobalAddress()) {
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} else if (MO.isMachineBasicBlock()) {
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MachineBasicBlock *MBB = MO.getMachineBasicBlock();
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} else if (MO.isExternalSymbol()) {
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} else if (MO.isFrameIndex()) {
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unsigned index = MO.getFrameIndex();
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} else if (MO.isConstantPoolIndex()) {
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unsigned index = MO.getCosntantPoolIndex();
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#endif
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} else {
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std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
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abort();
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}
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return rv;
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}
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void *PPC32JITInfo::getJITStubForFunction(Function *F,
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MachineCodeEmitter &MCE) {
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std::cerr << "PPC32JITInfo::getJITStubForFunction not implemented\n";
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abort();
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return 0;
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}
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void PPC32JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
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std::cerr << "PPC32JITInfo::replaceMachineCodeForFunction not implemented\n";
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abort();
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}
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#include "PPC32GenCodeEmitter.inc"
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} // end llvm namespace
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