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504 lines
18 KiB
C++
504 lines
18 KiB
C++
//===-- X86/X86CodeEmitter.cpp - Convert X86 code to machine code ---------===//
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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 contains the pass that transforms the X86 machine instructions into
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// relocatable machine code.
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//
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//===----------------------------------------------------------------------===//
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#include "X86TargetMachine.h"
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#include "X86Relocations.h"
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#include "X86.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/MachineInstr.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Function.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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namespace {
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Statistic<>
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NumEmitted("x86-emitter", "Number of machine instructions emitted");
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}
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namespace {
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class Emitter : public MachineFunctionPass {
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const X86InstrInfo *II;
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MachineCodeEmitter &MCE;
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std::map<const MachineBasicBlock*, unsigned> BasicBlockAddrs;
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std::vector<std::pair<const MachineBasicBlock *, unsigned> > BBRefs;
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public:
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explicit Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
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Emitter(MachineCodeEmitter &mce, const X86InstrInfo& ii)
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: II(&ii), MCE(mce) {}
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bool runOnMachineFunction(MachineFunction &MF);
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virtual const char *getPassName() const {
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return "X86 Machine Code Emitter";
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}
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void emitInstruction(const MachineInstr &MI);
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private:
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void emitBasicBlock(const MachineBasicBlock &MBB);
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void emitPCRelativeBlockAddress(const MachineBasicBlock *BB);
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void emitPCRelativeValue(unsigned Address);
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void emitGlobalAddressForCall(GlobalValue *GV, bool isTailCall);
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void emitGlobalAddressForPtr(GlobalValue *GV, int Disp = 0);
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void emitExternalSymbolAddress(const char *ES, bool isPCRelative,
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bool isTailCall);
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void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
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void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
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void emitConstant(unsigned Val, unsigned Size);
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void emitMemModRMByte(const MachineInstr &MI,
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unsigned Op, unsigned RegOpcodeField);
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};
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}
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/// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
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/// to the specified MCE object.
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FunctionPass *llvm::createX86CodeEmitterPass(MachineCodeEmitter &MCE) {
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return new Emitter(MCE);
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}
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bool Emitter::runOnMachineFunction(MachineFunction &MF) {
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II = ((X86TargetMachine&)MF.getTarget()).getInstrInfo();
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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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// Resolve all forward branches now...
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for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
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unsigned Location = BasicBlockAddrs[BBRefs[i].first];
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unsigned Ref = BBRefs[i].second;
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MCE.emitWordAt(Location-Ref-4, (unsigned*)(intptr_t)Ref);
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}
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BBRefs.clear();
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BasicBlockAddrs.clear();
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return false;
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}
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void Emitter::emitBasicBlock(const MachineBasicBlock &MBB) {
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if (uint64_t Addr = MCE.getCurrentPCValue())
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BasicBlockAddrs[&MBB] = Addr;
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for (MachineBasicBlock::const_iterator I = MBB.begin(), E = MBB.end();
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I != E; ++I)
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emitInstruction(*I);
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}
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/// emitPCRelativeValue - Emit a 32-bit PC relative address.
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///
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void Emitter::emitPCRelativeValue(unsigned Address) {
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MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
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}
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/// emitPCRelativeBlockAddress - This method emits the PC relative address of
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/// the specified basic block, or if the basic block hasn't been emitted yet
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/// (because this is a forward branch), it keeps track of the information
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/// necessary to resolve this address later (and emits a dummy value).
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///
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void Emitter::emitPCRelativeBlockAddress(const MachineBasicBlock *MBB) {
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// If this is a backwards branch, we already know the address of the target,
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// so just emit the value.
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std::map<const MachineBasicBlock*, unsigned>::iterator I =
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BasicBlockAddrs.find(MBB);
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if (I != BasicBlockAddrs.end()) {
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emitPCRelativeValue(I->second);
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} else {
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// Otherwise, remember where this reference was and where it is to so we can
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// deal with it later.
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BBRefs.push_back(std::make_pair(MBB, MCE.getCurrentPCValue()));
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MCE.emitWord(0);
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}
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}
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/// emitGlobalAddressForCall - Emit the specified address to the code stream
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/// assuming this is part of a function call, which is PC relative.
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///
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void Emitter::emitGlobalAddressForCall(GlobalValue *GV, bool isTailCall) {
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MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
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X86::reloc_pcrel_word, GV, 0,
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!isTailCall /*Doesn'tNeedStub*/));
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MCE.emitWord(0);
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}
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/// emitGlobalAddress - Emit the specified address to the code stream assuming
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/// this is part of a "take the address of a global" instruction, which is not
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/// PC relative.
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///
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void Emitter::emitGlobalAddressForPtr(GlobalValue *GV, int Disp /* = 0 */) {
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MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
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X86::reloc_absolute_word, GV));
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MCE.emitWord(Disp); // The relocated value will be added to the displacement
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}
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/// emitExternalSymbolAddress - Arrange for the address of an external symbol to
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/// be emitted to the current location in the function, and allow it to be PC
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/// relative.
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void Emitter::emitExternalSymbolAddress(const char *ES, bool isPCRelative,
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bool isTailCall) {
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MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
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isPCRelative ? X86::reloc_pcrel_word : X86::reloc_absolute_word, ES));
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MCE.emitWord(0);
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}
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/// N86 namespace - Native X86 Register numbers... used by X86 backend.
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///
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namespace N86 {
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enum {
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EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
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};
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}
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// getX86RegNum - This function maps LLVM register identifiers to their X86
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// specific numbering, which is used in various places encoding instructions.
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//
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static unsigned getX86RegNum(unsigned RegNo) {
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switch(RegNo) {
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case X86::EAX: case X86::AX: case X86::AL: return N86::EAX;
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case X86::ECX: case X86::CX: case X86::CL: return N86::ECX;
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case X86::EDX: case X86::DX: case X86::DL: return N86::EDX;
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case X86::EBX: case X86::BX: case X86::BL: return N86::EBX;
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case X86::ESP: case X86::SP: case X86::AH: return N86::ESP;
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case X86::EBP: case X86::BP: case X86::CH: return N86::EBP;
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case X86::ESI: case X86::SI: case X86::DH: return N86::ESI;
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case X86::EDI: case X86::DI: case X86::BH: return N86::EDI;
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case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3:
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case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
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return RegNo-X86::ST0;
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default:
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assert(MRegisterInfo::isVirtualRegister(RegNo) &&
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"Unknown physical register!");
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assert(0 && "Register allocator hasn't allocated reg correctly yet!");
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return 0;
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}
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}
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inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
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unsigned RM) {
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assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
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return RM | (RegOpcode << 3) | (Mod << 6);
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}
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void Emitter::emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeFld){
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MCE.emitByte(ModRMByte(3, RegOpcodeFld, getX86RegNum(ModRMReg)));
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}
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void Emitter::emitSIBByte(unsigned SS, unsigned Index, unsigned Base) {
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// SIB byte is in the same format as the ModRMByte...
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MCE.emitByte(ModRMByte(SS, Index, Base));
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}
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void Emitter::emitConstant(unsigned Val, unsigned Size) {
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// Output the constant in little endian byte order...
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for (unsigned i = 0; i != Size; ++i) {
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MCE.emitByte(Val & 255);
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Val >>= 8;
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}
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}
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static bool isDisp8(int Value) {
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return Value == (signed char)Value;
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}
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void Emitter::emitMemModRMByte(const MachineInstr &MI,
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unsigned Op, unsigned RegOpcodeField) {
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const MachineOperand &Op3 = MI.getOperand(Op+3);
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GlobalValue *GV = 0;
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int DispVal = 0;
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if (Op3.isGlobalAddress()) {
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GV = Op3.getGlobal();
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DispVal = Op3.getOffset();
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} else {
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DispVal = Op3.getImmedValue();
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}
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const MachineOperand &Base = MI.getOperand(Op);
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const MachineOperand &Scale = MI.getOperand(Op+1);
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const MachineOperand &IndexReg = MI.getOperand(Op+2);
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unsigned BaseReg = 0;
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if (Base.isConstantPoolIndex()) {
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// Emit a direct address reference [disp32] where the displacement of the
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// constant pool entry is controlled by the MCE.
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assert(!GV && "Constant Pool reference cannot be relative to global!");
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DispVal += MCE.getConstantPoolEntryAddress(Base.getConstantPoolIndex());
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} else {
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BaseReg = Base.getReg();
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}
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// Is a SIB byte needed?
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if (IndexReg.getReg() == 0 && BaseReg != X86::ESP) {
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if (BaseReg == 0) { // Just a displacement?
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// Emit special case [disp32] encoding
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
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if (GV)
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emitGlobalAddressForPtr(GV, DispVal);
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else
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emitConstant(DispVal, 4);
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} else {
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unsigned BaseRegNo = getX86RegNum(BaseReg);
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if (GV) {
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// Emit the most general non-SIB encoding: [REG+disp32]
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MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
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emitGlobalAddressForPtr(GV, DispVal);
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} else if (DispVal == 0 && BaseRegNo != N86::EBP) {
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// Emit simple indirect register encoding... [EAX] f.e.
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MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
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} else if (isDisp8(DispVal)) {
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// Emit the disp8 encoding... [REG+disp8]
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MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
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emitConstant(DispVal, 1);
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} else {
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// Emit the most general non-SIB encoding: [REG+disp32]
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MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
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emitConstant(DispVal, 4);
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}
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}
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} else { // We need a SIB byte, so start by outputting the ModR/M byte first
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assert(IndexReg.getReg() != X86::ESP && "Cannot use ESP as index reg!");
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bool ForceDisp32 = false;
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bool ForceDisp8 = false;
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if (BaseReg == 0) {
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// If there is no base register, we emit the special case SIB byte with
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// MOD=0, BASE=5, to JUST get the index, scale, and displacement.
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
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ForceDisp32 = true;
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} else if (GV) {
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// Emit the normal disp32 encoding...
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MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
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ForceDisp32 = true;
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} else if (DispVal == 0 && BaseReg != X86::EBP) {
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// Emit no displacement ModR/M byte
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
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} else if (isDisp8(DispVal)) {
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// Emit the disp8 encoding...
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MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
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ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
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} else {
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// Emit the normal disp32 encoding...
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MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
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}
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// Calculate what the SS field value should be...
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static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
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unsigned SS = SSTable[Scale.getImmedValue()];
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if (BaseReg == 0) {
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// Handle the SIB byte for the case where there is no base. The
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// displacement has already been output.
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assert(IndexReg.getReg() && "Index register must be specified!");
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emitSIBByte(SS, getX86RegNum(IndexReg.getReg()), 5);
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} else {
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unsigned BaseRegNo = getX86RegNum(BaseReg);
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unsigned IndexRegNo;
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if (IndexReg.getReg())
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IndexRegNo = getX86RegNum(IndexReg.getReg());
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else
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IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
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emitSIBByte(SS, IndexRegNo, BaseRegNo);
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}
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// Do we need to output a displacement?
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if (DispVal != 0 || ForceDisp32 || ForceDisp8) {
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if (!ForceDisp32 && isDisp8(DispVal))
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emitConstant(DispVal, 1);
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else if (GV)
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emitGlobalAddressForPtr(GV, DispVal);
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else
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emitConstant(DispVal, 4);
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}
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}
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}
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static unsigned sizeOfImm(const TargetInstrDescriptor &Desc) {
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switch (Desc.TSFlags & X86II::ImmMask) {
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case X86II::Imm8: return 1;
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case X86II::Imm16: return 2;
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case X86II::Imm32: return 4;
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default: assert(0 && "Immediate size not set!");
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return 0;
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}
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}
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void Emitter::emitInstruction(const MachineInstr &MI) {
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NumEmitted++; // Keep track of the # of mi's emitted
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unsigned Opcode = MI.getOpcode();
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const TargetInstrDescriptor &Desc = II->get(Opcode);
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// Emit the repeat opcode prefix as needed.
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if ((Desc.TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
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// Emit the operand size opcode prefix as needed.
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if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);
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// Emit the double precision sse fp opcode prefix as needed.
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if ((Desc.TSFlags & X86II::Op0Mask) == X86II::XD) {
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MCE.emitByte(0xF2); MCE.emitByte(0x0F);
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}
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// Emit the double precision sse fp opcode prefix as needed.
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if ((Desc.TSFlags & X86II::Op0Mask) == X86II::XS) {
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MCE.emitByte(0xF3); MCE.emitByte(0x0F);
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}
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switch (Desc.TSFlags & X86II::Op0Mask) {
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case X86II::TB:
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MCE.emitByte(0x0F); // Two-byte opcode prefix
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break;
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case X86II::REP: break; // already handled.
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case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
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case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
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MCE.emitByte(0xD8+
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(((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
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>> X86II::Op0Shift));
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break; // Two-byte opcode prefix
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default: assert(0 && "Invalid prefix!");
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case 0: break; // No prefix!
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}
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unsigned char BaseOpcode = II->getBaseOpcodeFor(Opcode);
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switch (Desc.TSFlags & X86II::FormMask) {
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default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
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case X86II::Pseudo:
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if (Opcode != X86::IMPLICIT_USE &&
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Opcode != X86::IMPLICIT_DEF &&
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Opcode != X86::FP_REG_KILL)
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std::cerr << "X86 Machine Code Emitter: No 'form', not emitting: " << MI;
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break;
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case X86II::RawFrm:
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MCE.emitByte(BaseOpcode);
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if (MI.getNumOperands() == 1) {
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const MachineOperand &MO = MI.getOperand(0);
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if (MO.isMachineBasicBlock()) {
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emitPCRelativeBlockAddress(MO.getMachineBasicBlock());
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} else if (MO.isGlobalAddress()) {
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assert(MO.isPCRelative() && "Call target is not PC Relative?");
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bool isTailCall = Opcode == X86::TAILJMPd ||
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Opcode == X86::TAILJMPr || Opcode == X86::TAILJMPm;
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emitGlobalAddressForCall(MO.getGlobal(), isTailCall);
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} else if (MO.isExternalSymbol()) {
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bool isTailCall = Opcode == X86::TAILJMPd ||
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Opcode == X86::TAILJMPr || Opcode == X86::TAILJMPm;
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emitExternalSymbolAddress(MO.getSymbolName(), true, isTailCall);
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} else if (MO.isImmediate()) {
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emitConstant(MO.getImmedValue(), sizeOfImm(Desc));
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} else {
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assert(0 && "Unknown RawFrm operand!");
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}
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}
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break;
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case X86II::AddRegFrm:
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MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
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if (MI.getNumOperands() == 2) {
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const MachineOperand &MO1 = MI.getOperand(1);
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if (Value *V = MO1.getVRegValueOrNull()) {
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assert(sizeOfImm(Desc) == 4 &&
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"Don't know how to emit non-pointer values!");
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emitGlobalAddressForPtr(cast<GlobalValue>(V));
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} else if (MO1.isGlobalAddress()) {
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assert(sizeOfImm(Desc) == 4 &&
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"Don't know how to emit non-pointer values!");
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assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
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emitGlobalAddressForPtr(MO1.getGlobal(), MO1.getOffset());
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} else if (MO1.isExternalSymbol()) {
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assert(sizeOfImm(Desc) == 4 &&
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"Don't know how to emit non-pointer values!");
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emitExternalSymbolAddress(MO1.getSymbolName(), false, false);
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} else {
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emitConstant(MO1.getImmedValue(), sizeOfImm(Desc));
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}
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}
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break;
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case X86II::MRMDestReg: {
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MCE.emitByte(BaseOpcode);
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emitRegModRMByte(MI.getOperand(0).getReg(),
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getX86RegNum(MI.getOperand(1).getReg()));
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if (MI.getNumOperands() == 3)
|
|
emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
|
|
break;
|
|
}
|
|
case X86II::MRMDestMem:
|
|
MCE.emitByte(BaseOpcode);
|
|
emitMemModRMByte(MI, 0, getX86RegNum(MI.getOperand(4).getReg()));
|
|
if (MI.getNumOperands() == 6)
|
|
emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
|
|
break;
|
|
|
|
case X86II::MRMSrcReg:
|
|
MCE.emitByte(BaseOpcode);
|
|
|
|
emitRegModRMByte(MI.getOperand(1).getReg(),
|
|
getX86RegNum(MI.getOperand(0).getReg()));
|
|
if (MI.getNumOperands() == 3)
|
|
emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
|
|
break;
|
|
|
|
case X86II::MRMSrcMem:
|
|
MCE.emitByte(BaseOpcode);
|
|
emitMemModRMByte(MI, 1, getX86RegNum(MI.getOperand(0).getReg()));
|
|
if (MI.getNumOperands() == 2+4)
|
|
emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
|
|
break;
|
|
|
|
case X86II::MRM0r: case X86II::MRM1r:
|
|
case X86II::MRM2r: case X86II::MRM3r:
|
|
case X86II::MRM4r: case X86II::MRM5r:
|
|
case X86II::MRM6r: case X86II::MRM7r:
|
|
MCE.emitByte(BaseOpcode);
|
|
emitRegModRMByte(MI.getOperand(0).getReg(),
|
|
(Desc.TSFlags & X86II::FormMask)-X86II::MRM0r);
|
|
|
|
if (MI.getOperand(MI.getNumOperands()-1).isImmediate()) {
|
|
emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(),
|
|
sizeOfImm(Desc));
|
|
}
|
|
break;
|
|
|
|
case X86II::MRM0m: case X86II::MRM1m:
|
|
case X86II::MRM2m: case X86II::MRM3m:
|
|
case X86II::MRM4m: case X86II::MRM5m:
|
|
case X86II::MRM6m: case X86II::MRM7m:
|
|
MCE.emitByte(BaseOpcode);
|
|
emitMemModRMByte(MI, 0, (Desc.TSFlags & X86II::FormMask)-X86II::MRM0m);
|
|
|
|
if (MI.getNumOperands() == 5) {
|
|
if (MI.getOperand(4).isImmediate())
|
|
emitConstant(MI.getOperand(4).getImmedValue(), sizeOfImm(Desc));
|
|
else if (MI.getOperand(4).isGlobalAddress())
|
|
emitGlobalAddressForPtr(MI.getOperand(4).getGlobal(),
|
|
MI.getOperand(4).getOffset());
|
|
else
|
|
assert(0 && "Unknown operand!");
|
|
}
|
|
break;
|
|
}
|
|
}
|