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Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting fall out by removing unused variables. Remaining warnings have to do with unused functions (I didn't want to delete code without review) and unused variables in generated code. Maintainers should clean up the remaining issues when they see them. All changes pass DejaGnu tests and Olden. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31380 91177308-0d34-0410-b5e6-96231b3b80d8
204 lines
6.8 KiB
C++
204 lines
6.8 KiB
C++
//===-- PPCCodeEmitter.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 "PPCTargetMachine.h"
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#include "PPCRelocations.h"
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#include "PPC.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.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/MachineInstrBuilder.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Target/TargetOptions.h"
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#include <iostream>
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN PPCCodeEmitter : public MachineFunctionPass {
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TargetMachine &TM;
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MachineCodeEmitter &MCE;
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/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
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///
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int getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
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public:
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PPCCodeEmitter(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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/// 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 - This function, generated by the
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/// CodeEmitterGenerator using TableGen, produces the binary encoding for
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/// machine instructions.
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///
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unsigned getBinaryCodeForInstr(MachineInstr &MI);
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};
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}
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/// createPPCCodeEmitterPass - Return a pass that emits the collected PPC code
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/// to the specified MCE object.
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FunctionPass *llvm::createPPCCodeEmitterPass(PPCTargetMachine &TM,
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MachineCodeEmitter &MCE) {
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return new PPCCodeEmitter(TM, MCE);
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}
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#ifdef __APPLE__
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extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
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#endif
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bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
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MF.getTarget().getRelocationModel() != Reloc::Static) &&
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"JIT relocation model must be set to static or default!");
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do {
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MCE.startFunction(MF);
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for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
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emitBasicBlock(*BB);
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} while (MCE.finishFunction(MF));
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return false;
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}
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void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
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MCE.StartMachineBasicBlock(&MBB);
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){
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MachineInstr &MI = *I;
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switch (MI.getOpcode()) {
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default:
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MCE.emitWordBE(getBinaryCodeForInstr(*I));
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break;
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case PPC::IMPLICIT_DEF_GPRC:
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case PPC::IMPLICIT_DEF_G8RC:
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case PPC::IMPLICIT_DEF_F8:
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case PPC::IMPLICIT_DEF_F4:
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case PPC::IMPLICIT_DEF_VRRC:
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break; // pseudo opcode, no side effects
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case PPC::MovePCtoLR:
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assert(0 && "CodeEmitter does not support MovePCtoLR instruction");
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break;
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}
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}
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}
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int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
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intptr_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.isRegister()) {
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rv = PPCRegisterInfo::getRegisterNumbering(MO.getReg());
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// Special encoding for MTCRF and MFOCRF, which uses a bit mask for the
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// register, not the register number directly.
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if ((MI.getOpcode() == PPC::MTCRF || MI.getOpcode() == PPC::MFOCRF) &&
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(MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7)) {
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rv = 0x80 >> rv;
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}
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} else if (MO.isImmediate()) {
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rv = MO.getImmedValue();
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} else if (MO.isGlobalAddress() || MO.isExternalSymbol() ||
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MO.isConstantPoolIndex() || MO.isJumpTableIndex()) {
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unsigned Reloc = 0;
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if (MI.getOpcode() == PPC::BL)
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Reloc = PPC::reloc_pcrel_bx;
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else {
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switch (MI.getOpcode()) {
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default: DEBUG(MI.dump()); assert(0 && "Unknown instruction for relocation!");
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case PPC::LIS:
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case PPC::LIS8:
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case PPC::ADDIS:
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case PPC::ADDIS8:
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Reloc = PPC::reloc_absolute_high; // Pointer to symbol
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break;
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case PPC::LI:
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case PPC::LI8:
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case PPC::LA:
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// Loads.
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case PPC::LBZ:
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case PPC::LHA:
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case PPC::LHZ:
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case PPC::LWZ:
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case PPC::LFS:
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case PPC::LFD:
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case PPC::LWZ8:
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// Stores.
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case PPC::STB:
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case PPC::STH:
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case PPC::STW:
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case PPC::STFS:
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case PPC::STFD:
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Reloc = PPC::reloc_absolute_low;
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break;
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case PPC::LWA:
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case PPC::LD:
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case PPC::STD:
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case PPC::STD_32:
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Reloc = PPC::reloc_absolute_low_ix;
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break;
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}
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}
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if (MO.isGlobalAddress())
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MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
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Reloc, MO.getGlobal(), 0));
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else if (MO.isExternalSymbol())
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MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
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Reloc, MO.getSymbolName(), 0));
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else if (MO.isConstantPoolIndex())
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MCE.addRelocation(MachineRelocation::getConstPool(
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MCE.getCurrentPCOffset(),
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Reloc, MO.getConstantPoolIndex(), 0));
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else // isJumpTableIndex
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MCE.addRelocation(MachineRelocation::getJumpTable(
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MCE.getCurrentPCOffset(),
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Reloc, MO.getJumpTableIndex(), 0));
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} else if (MO.isMachineBasicBlock()) {
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unsigned Reloc = 0;
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unsigned Opcode = MI.getOpcode();
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if (Opcode == PPC::B || Opcode == PPC::BL || Opcode == PPC::BLA)
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Reloc = PPC::reloc_pcrel_bx;
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else
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// BLT,BLE,BEQ,BGE,BGT,BNE, or other bcx instruction
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Reloc = PPC::reloc_pcrel_bcx;
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MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
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Reloc,
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MO.getMachineBasicBlock()));
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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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#include "PPCGenCodeEmitter.inc"
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