//===-- X86/X86CodeEmitter.cpp - Convert X86 code to machine code ---------===//
//
+// 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 contains the pass that transforms the X86 machine instructions into
-// actual executable machine code.
+// relocatable machine code.
//
//===----------------------------------------------------------------------===//
#include "X86TargetMachine.h"
+#include "X86Relocations.h"
#include "X86.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
-#include "llvm/Value.h"
-#include "Support/Statistic.h"
-#include "Support/Alloca.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Function.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Target/TargetOptions.h"
+#include <iostream>
+using namespace llvm;
namespace {
Statistic<>
NumEmitted("x86-emitter", "Number of machine instructions emitted");
-
- class JITResolver {
- MachineCodeEmitter &MCE;
-
- // LazyCodeGenMap - Keep track of call sites for functions that are to be
- // lazily resolved.
- std::map<unsigned, Function*> LazyCodeGenMap;
-
- // LazyResolverMap - Keep track of the lazy resolver created for a
- // particular function so that we can reuse them if necessary.
- std::map<Function*, unsigned> LazyResolverMap;
- public:
- JITResolver(MachineCodeEmitter &mce) : MCE(mce) {}
- unsigned getLazyResolver(Function *F);
- unsigned addFunctionReference(unsigned Address, Function *F);
-
- private:
- unsigned emitStubForFunction(Function *F);
- static void CompilationCallback();
- unsigned resolveFunctionReference(unsigned RetAddr);
- };
-
- JITResolver *TheJITResolver;
-}
-
-
-/// addFunctionReference - This method is called when we need to emit the
-/// address of a function that has not yet been emitted, so we don't know the
-/// address. Instead, we emit a call to the CompilationCallback method, and
-/// keep track of where we are.
-///
-unsigned JITResolver::addFunctionReference(unsigned Address, Function *F) {
- LazyCodeGenMap[Address] = F;
- return (intptr_t)&JITResolver::CompilationCallback;
-}
-
-unsigned JITResolver::resolveFunctionReference(unsigned RetAddr) {
- std::map<unsigned, Function*>::iterator I = LazyCodeGenMap.find(RetAddr);
- assert(I != LazyCodeGenMap.end() && "Not in map!");
- Function *F = I->second;
- LazyCodeGenMap.erase(I);
- return MCE.forceCompilationOf(F);
}
-unsigned JITResolver::getLazyResolver(Function *F) {
- std::map<Function*, unsigned>::iterator I = LazyResolverMap.lower_bound(F);
- if (I != LazyResolverMap.end() && I->first == F) return I->second;
-
-//std::cerr << "Getting lazy resolver for : " << ((Value*)F)->getName() << "\n";
-
- unsigned Stub = emitStubForFunction(F);
- LazyResolverMap.insert(I, std::make_pair(F, Stub));
- return Stub;
-}
-
-void JITResolver::CompilationCallback() {
- unsigned *StackPtr = (unsigned*)__builtin_frame_address(0);
- unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(0);
- assert(StackPtr[1] == RetAddr &&
- "Could not find return address on the stack!");
-
- // It's a stub if there is an interrupt marker after the call...
- bool isStub = ((unsigned char*)(intptr_t)RetAddr)[0] == 0xCD;
-
- // FIXME FIXME FIXME FIXME: __builtin_frame_address doesn't work if frame
- // pointer elimination has been performed. Having a variable sized alloca
- // disables frame pointer elimination currently, even if it's dead. This is a
- // gross hack.
- alloca(10+isStub);
- // FIXME FIXME FIXME FIXME
-
- // The call instruction should have pushed the return value onto the stack...
- RetAddr -= 4; // Backtrack to the reference itself...
-
-#if 0
- DEBUG(std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
- << " ESP=0x" << (unsigned)StackPtr << std::dec
- << ": Resolving call to function: "
- << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
-#endif
-
- // Sanity check to make sure this really is a call instruction...
- assert(((unsigned char*)(intptr_t)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
-
- unsigned NewVal = TheJITResolver->resolveFunctionReference(RetAddr);
-
- // Rewrite the call target... so that we don't fault every time we execute
- // the call.
- *(unsigned*)(intptr_t)RetAddr = NewVal-RetAddr-4;
-
- if (isStub) {
- // If this is a stub, rewrite the call into an unconditional branch
- // instruction so that two return addresses are not pushed onto the stack
- // when the requested function finally gets called. This also makes the
- // 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
- ((unsigned char*)(intptr_t)RetAddr)[-1] = 0xE9;
- }
-
- // Change the return address to reexecute the call instruction...
- StackPtr[1] -= 5;
-}
-
-/// emitStubForFunction - This method is used by the JIT when it needs to emit
-/// the address of a function for a function whose code has not yet been
-/// generated. In order to do this, it generates a stub which jumps to the lazy
-/// function compiler, which will eventually get fixed to call the function
-/// directly.
-///
-unsigned JITResolver::emitStubForFunction(Function *F) {
- MCE.startFunctionStub(*F, 6);
- MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
-
- unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
- MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
-
- MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
- return (intptr_t)MCE.finishFunctionStub(*F);
-}
-
-
-
namespace {
class Emitter : public MachineFunctionPass {
const X86InstrInfo *II;
MachineCodeEmitter &MCE;
- std::map<BasicBlock*, unsigned> BasicBlockAddrs;
- std::vector<std::pair<BasicBlock*, unsigned> > BBRefs;
+ std::vector<std::pair<MachineBasicBlock *, unsigned> > BBRefs;
public:
- Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
+ explicit Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
+ Emitter(MachineCodeEmitter &mce, const X86InstrInfo& ii)
+ : II(&ii), MCE(mce) {}
bool runOnMachineFunction(MachineFunction &MF);
return "X86 Machine Code Emitter";
}
+ void emitInstruction(const MachineInstr &MI);
+
private:
void emitBasicBlock(MachineBasicBlock &MBB);
- void emitInstruction(MachineInstr &MI);
-
- void emitPCRelativeBlockAddress(BasicBlock *BB);
- void emitMaybePCRelativeValue(unsigned Address, bool isPCRelative);
- void emitGlobalAddressForCall(GlobalValue *GV);
- void emitGlobalAddressForPtr(GlobalValue *GV);
+ void emitPCRelativeBlockAddress(MachineBasicBlock *MBB);
+ void emitPCRelativeValue(unsigned Address);
+ void emitGlobalAddressForCall(GlobalValue *GV, bool isTailCall);
+ void emitGlobalAddressForPtr(GlobalValue *GV, int Disp = 0);
+ void emitExternalSymbolAddress(const char *ES, bool isPCRelative,
+ bool isTailCall);
void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
};
}
-/// 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 X86TargetMachine::addPassesToEmitMachineCode(PassManager &PM,
- MachineCodeEmitter &MCE) {
- PM.add(new Emitter(MCE));
- return false;
+/// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
+/// to the specified MCE object.
+FunctionPass *llvm::createX86CodeEmitterPass(MachineCodeEmitter &MCE) {
+ return new Emitter(MCE);
}
bool Emitter::runOnMachineFunction(MachineFunction &MF) {
- II = &((X86TargetMachine&)MF.getTarget()).getInstrInfo();
+ assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
+ MF.getTarget().getRelocationModel() != Reloc::Static) &&
+ "JIT relocation model must be set to static or default!");
+ II = ((X86TargetMachine&)MF.getTarget()).getInstrInfo();
- MCE.startFunction(MF);
- MCE.emitConstantPool(MF.getConstantPool());
- for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
- emitBasicBlock(*I);
- MCE.finishFunction(MF);
+ do {
+ BBRefs.clear();
- // Resolve all forward branches now...
+ MCE.startFunction(MF);
+ for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
+ emitBasicBlock(*I);
+ } while (MCE.finishFunction(MF));
+
+ // Resolve all forward branches now.
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
- unsigned Location = BasicBlockAddrs[BBRefs[i].first];
+ unsigned Location = MCE.getMachineBasicBlockAddress(BBRefs[i].first);
unsigned Ref = BBRefs[i].second;
- *(unsigned*)(intptr_t)Ref = Location-Ref-4;
+ *((unsigned*)(intptr_t)Ref) = Location-Ref-4;
}
BBRefs.clear();
- BasicBlockAddrs.clear();
return false;
}
void Emitter::emitBasicBlock(MachineBasicBlock &MBB) {
- if (uint64_t Addr = MCE.getCurrentPCValue())
- BasicBlockAddrs[MBB.getBasicBlock()] = Addr;
-
- for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
- emitInstruction(**I);
+ MCE.StartMachineBasicBlock(&MBB);
+ for (MachineBasicBlock::const_iterator I = MBB.begin(), E = MBB.end();
+ I != E; ++I)
+ emitInstruction(*I);
}
-
-/// emitPCRelativeBlockAddress - This method emits the PC relative address of
-/// the specified basic block, or if the basic block hasn't been emitted yet
-/// (because this is a forward branch), it keeps track of the information
-/// necessary to resolve this address later (and emits a dummy value).
+/// emitPCRelativeValue - Emit a 32-bit PC relative address.
///
-void Emitter::emitPCRelativeBlockAddress(BasicBlock *BB) {
- // FIXME: Emit backward branches directly
- BBRefs.push_back(std::make_pair(BB, MCE.getCurrentPCValue()));
- MCE.emitWord(0); // Emit a dummy value
+void Emitter::emitPCRelativeValue(unsigned Address) {
+ MCE.emitWordLE(Address-MCE.getCurrentPCValue()-4);
}
-/// emitMaybePCRelativeValue - Emit a 32-bit address which may be PC relative.
+/// emitPCRelativeBlockAddress - This method keeps track of the information
+/// necessary to resolve the address of this block later and emits a dummy
+/// value.
///
-void Emitter::emitMaybePCRelativeValue(unsigned Address, bool isPCRelative) {
- if (isPCRelative)
- MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
- else
- MCE.emitWord(Address);
+void Emitter::emitPCRelativeBlockAddress(MachineBasicBlock *MBB) {
+ // Remember where this reference was and where it is to so we can
+ // deal with it later.
+ BBRefs.push_back(std::make_pair(MBB, MCE.getCurrentPCValue()));
+ MCE.emitWordLE(0);
}
/// emitGlobalAddressForCall - Emit the specified address to the code stream
/// assuming this is part of a function call, which is PC relative.
///
-void Emitter::emitGlobalAddressForCall(GlobalValue *GV) {
- // Get the address from the backend...
- unsigned Address = MCE.getGlobalValueAddress(GV);
-
- // If the machine code emitter doesn't know what the address IS yet, we have
- // to take special measures.
- //
- if (Address == 0) {
- // FIXME: this is JIT specific!
- if (TheJITResolver == 0)
- TheJITResolver = new JITResolver(MCE);
- Address = TheJITResolver->addFunctionReference(MCE.getCurrentPCValue(),
- (Function*)GV);
- }
- emitMaybePCRelativeValue(Address, true);
+void Emitter::emitGlobalAddressForCall(GlobalValue *GV, bool isTailCall) {
+ MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
+ X86::reloc_pcrel_word, GV, 0,
+ !isTailCall /*Doesn'tNeedStub*/));
+ MCE.emitWordLE(0);
}
/// emitGlobalAddress - Emit the specified address to the code stream assuming
/// this is part of a "take the address of a global" instruction, which is not
/// PC relative.
///
-void Emitter::emitGlobalAddressForPtr(GlobalValue *GV) {
- // Get the address from the backend...
- unsigned Address = MCE.getGlobalValueAddress(GV);
-
- // If the machine code emitter doesn't know what the address IS yet, we have
- // to take special measures.
- //
- if (Address == 0) {
- // FIXME: this is JIT specific!
- if (TheJITResolver == 0)
- TheJITResolver = new JITResolver(MCE);
- Address = TheJITResolver->getLazyResolver((Function*)GV);
- }
-
- emitMaybePCRelativeValue(Address, false);
+void Emitter::emitGlobalAddressForPtr(GlobalValue *GV, int Disp /* = 0 */) {
+ MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
+ X86::reloc_absolute_word, GV));
+ MCE.emitWordLE(Disp); // The relocated value will be added to the displacement
}
-
+/// emitExternalSymbolAddress - Arrange for the address of an external symbol to
+/// be emitted to the current location in the function, and allow it to be PC
+/// relative.
+void Emitter::emitExternalSymbolAddress(const char *ES, bool isPCRelative,
+ bool isTailCall) {
+ MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
+ isPCRelative ? X86::reloc_pcrel_word : X86::reloc_absolute_word, ES));
+ MCE.emitWordLE(0);
+}
/// N86 namespace - Native X86 Register numbers... used by X86 backend.
///
case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3:
case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
return RegNo-X86::ST0;
+
+ case X86::XMM0: case X86::XMM1: case X86::XMM2: case X86::XMM3:
+ case X86::XMM4: case X86::XMM5: case X86::XMM6: case X86::XMM7:
+ return RegNo-X86::XMM0;
+
default:
- assert(RegNo >= MRegisterInfo::FirstVirtualRegister &&
+ assert(MRegisterInfo::isVirtualRegister(RegNo) &&
"Unknown physical register!");
assert(0 && "Register allocator hasn't allocated reg correctly yet!");
return 0;
void Emitter::emitMemModRMByte(const MachineInstr &MI,
unsigned Op, unsigned RegOpcodeField) {
- const MachineOperand &Disp = MI.getOperand(Op+3);
- if (MI.getOperand(Op).isConstantPoolIndex()) {
- // Emit a direct address reference [disp32] where the displacement of the
- // constant pool entry is controlled by the MCE.
- MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
- unsigned Index = MI.getOperand(Op).getConstantPoolIndex();
- unsigned Address = MCE.getConstantPoolEntryAddress(Index);
- MCE.emitWord(Address+Disp.getImmedValue());
- return;
+ const MachineOperand &Op3 = MI.getOperand(Op+3);
+ GlobalValue *GV = 0;
+ int DispVal = 0;
+
+ if (Op3.isGlobalAddress()) {
+ GV = Op3.getGlobal();
+ DispVal = Op3.getOffset();
+ } else if (Op3.isConstantPoolIndex()) {
+ DispVal += MCE.getConstantPoolEntryAddress(Op3.getConstantPoolIndex());
+ DispVal += Op3.getOffset();
+ } else if (Op3.isJumpTableIndex()) {
+ DispVal += MCE.getJumpTableEntryAddress(Op3.getJumpTableIndex());
+ } else {
+ DispVal = Op3.getImmedValue();
}
- const MachineOperand &BaseReg = MI.getOperand(Op);
+ const MachineOperand &Base = MI.getOperand(Op);
const MachineOperand &Scale = MI.getOperand(Op+1);
const MachineOperand &IndexReg = MI.getOperand(Op+2);
+ unsigned BaseReg = Base.getReg();
+
// Is a SIB byte needed?
- if (IndexReg.getReg() == 0 && BaseReg.getReg() != X86::ESP) {
- if (BaseReg.getReg() == 0) { // Just a displacement?
+ if (IndexReg.getReg() == 0 && BaseReg != X86::ESP) {
+ if (BaseReg == 0) { // Just a displacement?
// Emit special case [disp32] encoding
MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
- emitConstant(Disp.getImmedValue(), 4);
+ if (GV)
+ emitGlobalAddressForPtr(GV, DispVal);
+ else
+ emitConstant(DispVal, 4);
} else {
- unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
- if (Disp.getImmedValue() == 0 && BaseRegNo != N86::EBP) {
+ unsigned BaseRegNo = getX86RegNum(BaseReg);
+ if (GV) {
+ // Emit the most general non-SIB encoding: [REG+disp32]
+ MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
+ emitGlobalAddressForPtr(GV, DispVal);
+ } else if (DispVal == 0 && BaseRegNo != N86::EBP) {
// Emit simple indirect register encoding... [EAX] f.e.
MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
- } else if (isDisp8(Disp.getImmedValue())) {
+ } else if (isDisp8(DispVal)) {
// Emit the disp8 encoding... [REG+disp8]
MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
- emitConstant(Disp.getImmedValue(), 1);
+ emitConstant(DispVal, 1);
} else {
// Emit the most general non-SIB encoding: [REG+disp32]
MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
- emitConstant(Disp.getImmedValue(), 4);
+ emitConstant(DispVal, 4);
}
}
bool ForceDisp32 = false;
bool ForceDisp8 = false;
- if (BaseReg.getReg() == 0) {
+ if (BaseReg == 0) {
// If there is no base register, we emit the special case SIB byte with
// MOD=0, BASE=5, to JUST get the index, scale, and displacement.
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
ForceDisp32 = true;
- } else if (Disp.getImmedValue() == 0 && BaseReg.getReg() != X86::EBP) {
+ } else if (GV) {
+ // Emit the normal disp32 encoding...
+ MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
+ ForceDisp32 = true;
+ } else if (DispVal == 0 && BaseReg != X86::EBP) {
// Emit no displacement ModR/M byte
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
- } else if (isDisp8(Disp.getImmedValue())) {
+ } else if (isDisp8(DispVal)) {
// Emit the disp8 encoding...
MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
unsigned SS = SSTable[Scale.getImmedValue()];
- if (BaseReg.getReg() == 0) {
+ if (BaseReg == 0) {
// Handle the SIB byte for the case where there is no base. The
// displacement has already been output.
assert(IndexReg.getReg() && "Index register must be specified!");
emitSIBByte(SS, getX86RegNum(IndexReg.getReg()), 5);
} else {
- unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
+ unsigned BaseRegNo = getX86RegNum(BaseReg);
unsigned IndexRegNo;
if (IndexReg.getReg())
- IndexRegNo = getX86RegNum(IndexReg.getReg());
+ IndexRegNo = getX86RegNum(IndexReg.getReg());
else
- IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
+ IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
emitSIBByte(SS, IndexRegNo, BaseRegNo);
}
// Do we need to output a displacement?
- if (Disp.getImmedValue() != 0 || ForceDisp32 || ForceDisp8) {
- if (!ForceDisp32 && isDisp8(Disp.getImmedValue()))
- emitConstant(Disp.getImmedValue(), 1);
+ if (DispVal != 0 || ForceDisp32 || ForceDisp8) {
+ if (!ForceDisp32 && isDisp8(DispVal))
+ emitConstant(DispVal, 1);
+ else if (GV)
+ emitGlobalAddressForPtr(GV, DispVal);
else
- emitConstant(Disp.getImmedValue(), 4);
+ emitConstant(DispVal, 4);
}
}
}
-static unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
- switch (Desc.TSFlags & X86II::ArgMask) {
- case X86II::Arg8: return 1;
- case X86II::Arg16: return 2;
- case X86II::Arg32: return 4;
- case X86II::ArgF32: return 4;
- case X86II::ArgF64: return 8;
- case X86II::ArgF80: return 10;
- default: assert(0 && "Memory size not set!");
+static unsigned sizeOfImm(const TargetInstrDescriptor &Desc) {
+ switch (Desc.TSFlags & X86II::ImmMask) {
+ case X86II::Imm8: return 1;
+ case X86II::Imm16: return 2;
+ case X86II::Imm32: return 4;
+ default: assert(0 && "Immediate size not set!");
return 0;
}
}
-void Emitter::emitInstruction(MachineInstr &MI) {
+void Emitter::emitInstruction(const MachineInstr &MI) {
NumEmitted++; // Keep track of the # of mi's emitted
unsigned Opcode = MI.getOpcode();
const TargetInstrDescriptor &Desc = II->get(Opcode);
- // Emit instruction prefixes if neccesary
- if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);// Operand size...
+ // Emit the repeat opcode prefix as needed.
+ if ((Desc.TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
+
+ // Emit the operand size opcode prefix as needed.
+ if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);
switch (Desc.TSFlags & X86II::Op0Mask) {
case X86II::TB:
MCE.emitByte(0x0F); // Two-byte opcode prefix
break;
+ case X86II::REP: break; // already handled.
+ case X86II::XS: // F3 0F
+ MCE.emitByte(0xF3);
+ MCE.emitByte(0x0F);
+ break;
+ case X86II::XD: // F2 0F
+ MCE.emitByte(0xF2);
+ MCE.emitByte(0x0F);
+ break;
case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
MCE.emitByte(0xD8+
- (((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
- >> X86II::Op0Shift));
+ (((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
+ >> X86II::Op0Shift));
break; // Two-byte opcode prefix
default: assert(0 && "Invalid prefix!");
case 0: break; // No prefix!
switch (Desc.TSFlags & X86II::FormMask) {
default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
case X86II::Pseudo:
- if (Opcode != X86::IMPLICIT_USE)
- std::cerr << "X86 Machine Code Emitter: No 'form', not emitting: " << MI;
+#ifndef NDEBUG
+ switch (Opcode) {
+ default:
+ assert(0 && "psuedo instructions should be removed before code emission");
+ case X86::IMPLICIT_USE:
+ case X86::IMPLICIT_DEF:
+ case X86::IMPLICIT_DEF_R8:
+ case X86::IMPLICIT_DEF_R16:
+ case X86::IMPLICIT_DEF_R32:
+ case X86::IMPLICIT_DEF_FR32:
+ case X86::IMPLICIT_DEF_FR64:
+ case X86::IMPLICIT_DEF_VR64:
+ case X86::IMPLICIT_DEF_VR128:
+ case X86::FP_REG_KILL:
+ break;
+ }
+#endif
break;
case X86II::RawFrm:
MCE.emitByte(BaseOpcode);
if (MI.getNumOperands() == 1) {
- MachineOperand &MO = MI.getOperand(0);
- if (MO.isPCRelativeDisp()) {
- // Conditional branch... FIXME: this should use an MBB destination!
- emitPCRelativeBlockAddress(cast<BasicBlock>(MO.getVRegValue()));
+ const MachineOperand &MO = MI.getOperand(0);
+ if (MO.isMachineBasicBlock()) {
+ emitPCRelativeBlockAddress(MO.getMachineBasicBlock());
} else if (MO.isGlobalAddress()) {
- assert(MO.isPCRelative() && "Call target is not PC Relative?");
- emitGlobalAddressForCall(MO.getGlobal());
+ bool isTailCall = Opcode == X86::TAILJMPd ||
+ Opcode == X86::TAILJMPr || Opcode == X86::TAILJMPm;
+ emitGlobalAddressForCall(MO.getGlobal(), isTailCall);
} else if (MO.isExternalSymbol()) {
- unsigned Address = MCE.getGlobalValueAddress(MO.getSymbolName());
- assert(Address && "Unknown external symbol!");
- emitMaybePCRelativeValue(Address, MO.isPCRelative());
+ bool isTailCall = Opcode == X86::TAILJMPd ||
+ Opcode == X86::TAILJMPr || Opcode == X86::TAILJMPm;
+ emitExternalSymbolAddress(MO.getSymbolName(), true, isTailCall);
+ } else if (MO.isImmediate()) {
+ emitConstant(MO.getImmedValue(), sizeOfImm(Desc));
} else {
- assert(0 && "Unknown RawFrm operand!");
+ assert(0 && "Unknown RawFrm operand!");
}
}
break;
case X86II::AddRegFrm:
MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
if (MI.getNumOperands() == 2) {
- MachineOperand &MO1 = MI.getOperand(1);
- if (MO1.isImmediate() || MO1.getVRegValueOrNull() ||
- MO1.isGlobalAddress() || MO1.isExternalSymbol()) {
- unsigned Size = sizeOfPtr(Desc);
- if (Value *V = MO1.getVRegValueOrNull()) {
- assert(Size == 4 && "Don't know how to emit non-pointer values!");
- emitGlobalAddressForPtr(cast<GlobalValue>(V));
- } else if (MO1.isGlobalAddress()) {
- assert(Size == 4 && "Don't know how to emit non-pointer values!");
- assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
- emitGlobalAddressForPtr(MO1.getGlobal());
- } else if (MO1.isExternalSymbol()) {
- assert(Size == 4 && "Don't know how to emit non-pointer values!");
-
- unsigned Address = MCE.getGlobalValueAddress(MO1.getSymbolName());
- assert(Address && "Unknown external symbol!");
- emitMaybePCRelativeValue(Address, MO1.isPCRelative());
- } else {
- emitConstant(MO1.getImmedValue(), Size);
- }
+ const MachineOperand &MO1 = MI.getOperand(1);
+ if (Value *V = MO1.getVRegValueOrNull()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ emitGlobalAddressForPtr(cast<GlobalValue>(V));
+ } else if (MO1.isGlobalAddress()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
+ emitGlobalAddressForPtr(MO1.getGlobal(), MO1.getOffset());
+ } else if (MO1.isExternalSymbol()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ emitExternalSymbolAddress(MO1.getSymbolName(), false, false);
+ } else if (MO1.isJumpTableIndex()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ emitConstant(MCE.getJumpTableEntryAddress(MO1.getJumpTableIndex()), 4);
+ } else {
+ emitConstant(MO1.getImmedValue(), sizeOfImm(Desc));
}
}
break;
case X86II::MRMDestReg: {
MCE.emitByte(BaseOpcode);
- MachineOperand &SrcOp = MI.getOperand(1+II->isTwoAddrInstr(Opcode));
- emitRegModRMByte(MI.getOperand(0).getReg(), getX86RegNum(SrcOp.getReg()));
- if (MI.getNumOperands() == 4)
- emitConstant(MI.getOperand(3).getImmedValue(), sizeOfPtr(Desc));
+ emitRegModRMByte(MI.getOperand(0).getReg(),
+ getX86RegNum(MI.getOperand(1).getReg()));
+ 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(MI.getNumOperands()-1).getReg(),
+ 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, MI.getNumOperands()-4,
- getX86RegNum(MI.getOperand(0).getReg()));
+ emitMemModRMByte(MI, 1, getX86RegNum(MI.getOperand(0).getReg()));
+ if (MI.getNumOperands() == 2+4)
+ emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
break;
- case X86II::MRMS0r: case X86II::MRMS1r:
- case X86II::MRMS2r: case X86II::MRMS3r:
- case X86II::MRMS4r: case X86II::MRMS5r:
- case X86II::MRMS6r: case X86II::MRMS7r:
+ 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::MRMS0r);
+ (Desc.TSFlags & X86II::FormMask)-X86II::MRM0r);
if (MI.getOperand(MI.getNumOperands()-1).isImmediate()) {
- unsigned Size = sizeOfPtr(Desc);
- emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(), Size);
+ emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(),
+ sizeOfImm(Desc));
}
break;
- case X86II::MRMS0m: case X86II::MRMS1m:
- case X86II::MRMS2m: case X86II::MRMS3m:
- case X86II::MRMS4m: case X86II::MRMS5m:
- case X86II::MRMS6m: case X86II::MRMS7m:
+ 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::MRMS0m);
+ emitMemModRMByte(MI, 0, (Desc.TSFlags & X86II::FormMask)-X86II::MRM0m);
if (MI.getNumOperands() == 5) {
- unsigned Size = sizeOfPtr(Desc);
- emitConstant(MI.getOperand(4).getImmedValue(), Size);
+ 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 if (MI.getOperand(4).isJumpTableIndex())
+ emitConstant(MCE.getJumpTableEntryAddress(MI.getOperand(4)
+ .getJumpTableIndex()), 4);
+ else
+ assert(0 && "Unknown operand!");
}
break;
+
+ case X86II::MRMInitReg:
+ MCE.emitByte(BaseOpcode);
+ emitRegModRMByte(MI.getOperand(0).getReg(),
+ getX86RegNum(MI.getOperand(0).getReg()));
+ break;
}
}
projects / oota-llvm.git / blobdiff