llvm-6502/lib/Target/PowerPC/PPCCodeEmitter.cpp

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//===-- PPCCodeEmitter.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 "PPCTargetMachine.h"
#include "PPCRelocations.h"
#include "PPC.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/TargetOptions.h"
#include <iostream>
using namespace llvm;
namespace {
class PPCCodeEmitter : public MachineFunctionPass {
TargetMachine &TM;
MachineCodeEmitter &MCE;
// Tracks which instruction references which BasicBlock
std::vector<std::pair<MachineBasicBlock*, unsigned*> > BBRefs;
// Tracks where each BasicBlock starts
std::map<MachineBasicBlock*, long> BBLocations;
/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
///
int getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
public:
PPCCodeEmitter(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 - This function, generated by the
/// CodeEmitterGenerator using TableGen, produces the binary encoding for
/// machine instructions.
///
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 PPCTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
MachineCodeEmitter &MCE) {
// Machine code emitter pass for PowerPC
PM.add(new PPCCodeEmitter(*this, MCE));
// Delete machine code for this function after emitting it
PM.add(createMachineCodeDeleter());
return false;
}
bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
MF.getTarget().getRelocationModel() != Reloc::Static) &&
"JIT relocation model must be set to static or default!");
MCE.startFunction(MF);
MCE.emitConstantPool(MF.getConstantPool());
for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
emitBasicBlock(*BB);
MCE.finishFunction(MF);
// Resolve branches to BasicBlocks for the entire function
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
intptr_t Location = BBLocations[BBRefs[i].first];
unsigned *Ref = BBRefs[i].second;
DEBUG(std::cerr << "Fixup @ " << (void*)Ref << " to " << (void*)Location
<< "\n");
unsigned Instr = *Ref;
intptr_t BranchTargetDisp = (Location - (intptr_t)Ref) >> 2;
switch (Instr >> 26) {
default: assert(0 && "Unknown branch user!");
case 18: // This is B or BL
*Ref |= (BranchTargetDisp & ((1 << 24)-1)) << 2;
break;
case 16: // This is BLT,BLE,BEQ,BGE,BGT,BNE, or other bcx instruction
*Ref |= (BranchTargetDisp & ((1 << 14)-1)) << 2;
break;
}
}
BBRefs.clear();
BBLocations.clear();
return false;
}
void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
BBLocations[&MBB] = MCE.getCurrentPCValue();
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){
MachineInstr &MI = *I;
unsigned Opcode = MI.getOpcode();
switch (MI.getOpcode()) {
default:
emitWord(getBinaryCodeForInstr(*I));
break;
case PPC::IMPLICIT_DEF_GPR:
case PPC::IMPLICIT_DEF_F8:
case PPC::IMPLICIT_DEF_F4:
case PPC::IMPLICIT_DEF_VRRC:
break; // pseudo opcode, no side effects
case PPC::MovePCtoLR:
assert(0 && "CodeEmitter does not support MovePCtoLR instruction");
break;
}
}
}
int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
int rv = 0; // Return value; defaults to 0 for unhandled cases
// or things that get fixed up later by the JIT.
if (MO.isRegister()) {
rv = PPCRegisterInfo::getRegisterNumbering(MO.getReg());
// Special encoding for MTCRF and MFOCRF, which uses a bit mask for the
// register, not the register number directly.
if ((MI.getOpcode() == PPC::MTCRF || MI.getOpcode() == PPC::MFOCRF) &&
(MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7)) {
rv = 0x80 >> rv;
}
} else if (MO.isImmediate()) {
rv = MO.getImmedValue();
} else if (MO.isGlobalAddress() || MO.isExternalSymbol()) {
bool isExternal = MO.isExternalSymbol() ||
MO.getGlobal()->hasWeakLinkage() ||
MO.getGlobal()->hasLinkOnceLinkage() ||
(MO.getGlobal()->isExternal() &&
!MO.getGlobal()->hasNotBeenReadFromBytecode());
unsigned Reloc = 0;
if (MI.getOpcode() == PPC::BL)
Reloc = PPC::reloc_pcrel_bx;
else {
switch (MI.getOpcode()) {
default: MI.dump(); assert(0 && "Unknown instruction for relocation!");
case PPC::LIS:
if (isExternal)
Reloc = PPC::reloc_absolute_ptr_high; // Pointer to stub
else
Reloc = PPC::reloc_absolute_high; // Pointer to symbol
break;
case PPC::LA:
assert(!isExternal && "Something in the ISEL changed\n");
Reloc = PPC::reloc_absolute_low;
break;
case PPC::LBZ:
case PPC::LHA:
case PPC::LHZ:
case PPC::LWZ:
case PPC::LFS:
case PPC::LFD:
case PPC::STB:
case PPC::STH:
case PPC::STW:
case PPC::STFS:
case PPC::STFD:
if (isExternal)
Reloc = PPC::reloc_absolute_ptr_low;
else
Reloc = PPC::reloc_absolute_low;
break;
}
}
if (MO.isGlobalAddress())
MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
Reloc, MO.getGlobal(), 0));
else
MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
Reloc, MO.getSymbolName(), 0));
} else if (MO.isMachineBasicBlock()) {
unsigned* CurrPC = (unsigned*)(intptr_t)MCE.getCurrentPCValue();
BBRefs.push_back(std::make_pair(MO.getMachineBasicBlock(), CurrPC));
} else if (MO.isConstantPoolIndex()) {
unsigned index = MO.getConstantPoolIndex();
unsigned Opcode = MI.getOpcode();
rv = MCE.getConstantPoolEntryAddress(index);
if (Opcode == PPC::LIS || Opcode == PPC::ADDIS) {
// lis wants hi16(addr)
if ((short)rv < 0) rv += 1 << 16;
rv >>= 16;
} else if (Opcode == PPC::LWZ || Opcode == PPC::LA ||
Opcode == PPC::LI ||
Opcode == PPC::LFS || Opcode == PPC::LFD) {
// These load opcodes want lo16(addr)
rv &= 0xffff;
} else {
assert(0 && "Unknown constant pool using instruction!");
}
} else {
std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
abort();
}
return rv;
}
#include "PPCGenCodeEmitter.inc"