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Move X86 specific code out of the JIT into the X86 backend

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6516 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-06-01 23:23:50 +00:00
parent efc84a4082
commit 04b0b309c4
2 changed files with 430 additions and 26 deletions
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228
lib/Target/X86/MachineCodeEmitter.cpp
View File

@ -13,12 +13,126 @@
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Value.h"
namespace {
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)__builtin_return_address(0);
assert(StackPtr[1] == RetAddr &&
"Could not find return address on the stack!");
bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD; // Interrupt marker?
// 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*)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*)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*)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;
public:
Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
bool runOnMachineFunction(MachineFunction &MF);
@ -31,6 +145,11 @@ namespace {
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 emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
void emitConstant(unsigned Val, unsigned Size);
@ -61,16 +180,91 @@ bool Emitter::runOnMachineFunction(MachineFunction &MF) {
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
emitBasicBlock(*I);
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 Ref = BBRefs[i].second;
*(unsigned*)Ref = Location-Ref-4;
}
BBRefs.clear();
BasicBlockAddrs.clear();
return false;
}
void Emitter::emitBasicBlock(MachineBasicBlock &MBB) {
MCE.startBasicBlock(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);
}
/// 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).
///
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
}
/// emitMaybePCRelativeValue - Emit a 32-bit address which may be PC relative.
///
void Emitter::emitMaybePCRelativeValue(unsigned Address, bool isPCRelative) {
if (isPCRelative)
MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
else
MCE.emitWord(Address);
}
/// 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);
}
/// 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);
}
namespace N86 { // Native X86 Register numbers...
enum {
EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
@ -134,11 +328,12 @@ 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 is
// controlled by the MCE.
// 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();
MCE.emitFunctionConstantValueAddress(Index, Disp.getImmedValue());
unsigned Address = MCE.getConstantPoolEntryAddress(Index);
MCE.emitWord(Address+Disp.getImmedValue());
return;
}
@ -219,7 +414,7 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
}
}
unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
static unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
switch (Desc.TSFlags & X86II::ArgMask) {
case X86II::Arg8: return 1;
case X86II::Arg16: return 2;
@ -232,7 +427,6 @@ unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
}
}
void Emitter::emitInstruction(MachineInstr &MI) {
unsigned Opcode = MI.getOpcode();
const TargetInstrDescriptor &Desc = II->get(Opcode);
@ -267,11 +461,15 @@ void Emitter::emitInstruction(MachineInstr &MI) {
if (MI.getNumOperands() == 1) {
MachineOperand &MO = MI.getOperand(0);
if (MO.isPCRelativeDisp()) {
MCE.emitPCRelativeDisp(MO.getVRegValue());
// Conditional branch... FIXME: this should use an MBB destination!
emitPCRelativeBlockAddress(cast<BasicBlock>(MO.getVRegValue()));
} else if (MO.isGlobalAddress()) {
MCE.emitGlobalAddress(MO.getGlobal(), MO.isPCRelative());
assert(MO.isPCRelative() && "Call target is not PC Relative?");
emitGlobalAddressForCall(MO.getGlobal());
} else if (MO.isExternalSymbol()) {
MCE.emitGlobalAddress(MO.getSymbolName(), MO.isPCRelative());
unsigned Address = MCE.getGlobalValueAddress(MO.getSymbolName());
assert(Address && "Unknown external symbol!");
emitMaybePCRelativeValue(Address, MO.isPCRelative());
} else {
assert(0 && "Unknown RawFrm operand!");
}
@ -287,13 +485,17 @@ void Emitter::emitInstruction(MachineInstr &MI) {
unsigned Size = sizeOfPtr(Desc);
if (Value *V = MO1.getVRegValueOrNull()) {
assert(Size == 4 && "Don't know how to emit non-pointer values!");
MCE.emitGlobalAddress(cast<GlobalValue>(V), false);
emitGlobalAddressForPtr(cast<GlobalValue>(V));
} else if (MO1.isGlobalAddress()) {
assert(Size == 4 && "Don't know how to emit non-pointer values!");
MCE.emitGlobalAddress(MO1.getGlobal(), MO1.isPCRelative());
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!");
MCE.emitGlobalAddress(MO1.getSymbolName(), MO1.isPCRelative());
unsigned Address = MCE.getGlobalValueAddress(MO1.getSymbolName());
assert(Address && "Unknown external symbol!");
emitMaybePCRelativeValue(Address, MO1.isPCRelative());
} else {
emitConstant(MO1.getImmedValue(), Size);
}

228
lib/Target/X86/X86CodeEmitter.cpp
View File

@ -13,12 +13,126 @@
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Value.h"
namespace {
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)__builtin_return_address(0);
assert(StackPtr[1] == RetAddr &&
"Could not find return address on the stack!");
bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD; // Interrupt marker?
// 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*)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*)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*)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;
public:
Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
bool runOnMachineFunction(MachineFunction &MF);
@ -31,6 +145,11 @@ namespace {
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 emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
void emitConstant(unsigned Val, unsigned Size);
@ -61,16 +180,91 @@ bool Emitter::runOnMachineFunction(MachineFunction &MF) {
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
emitBasicBlock(*I);
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 Ref = BBRefs[i].second;
*(unsigned*)Ref = Location-Ref-4;
}
BBRefs.clear();
BasicBlockAddrs.clear();
return false;
}
void Emitter::emitBasicBlock(MachineBasicBlock &MBB) {
MCE.startBasicBlock(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);
}
/// 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).
///
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
}
/// emitMaybePCRelativeValue - Emit a 32-bit address which may be PC relative.
///
void Emitter::emitMaybePCRelativeValue(unsigned Address, bool isPCRelative) {
if (isPCRelative)
MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
else
MCE.emitWord(Address);
}
/// 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);
}
/// 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);
}
namespace N86 { // Native X86 Register numbers...
enum {
EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
@ -134,11 +328,12 @@ 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 is
// controlled by the MCE.
// 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();
MCE.emitFunctionConstantValueAddress(Index, Disp.getImmedValue());
unsigned Address = MCE.getConstantPoolEntryAddress(Index);
MCE.emitWord(Address+Disp.getImmedValue());
return;
}
@ -219,7 +414,7 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
}
}
unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
static unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
switch (Desc.TSFlags & X86II::ArgMask) {
case X86II::Arg8: return 1;
case X86II::Arg16: return 2;
@ -232,7 +427,6 @@ unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
}
}
void Emitter::emitInstruction(MachineInstr &MI) {
unsigned Opcode = MI.getOpcode();
const TargetInstrDescriptor &Desc = II->get(Opcode);
@ -267,11 +461,15 @@ void Emitter::emitInstruction(MachineInstr &MI) {
if (MI.getNumOperands() == 1) {
MachineOperand &MO = MI.getOperand(0);
if (MO.isPCRelativeDisp()) {
MCE.emitPCRelativeDisp(MO.getVRegValue());
// Conditional branch... FIXME: this should use an MBB destination!
emitPCRelativeBlockAddress(cast<BasicBlock>(MO.getVRegValue()));
} else if (MO.isGlobalAddress()) {
MCE.emitGlobalAddress(MO.getGlobal(), MO.isPCRelative());
assert(MO.isPCRelative() && "Call target is not PC Relative?");
emitGlobalAddressForCall(MO.getGlobal());
} else if (MO.isExternalSymbol()) {
MCE.emitGlobalAddress(MO.getSymbolName(), MO.isPCRelative());
unsigned Address = MCE.getGlobalValueAddress(MO.getSymbolName());
assert(Address && "Unknown external symbol!");
emitMaybePCRelativeValue(Address, MO.isPCRelative());
} else {
assert(0 && "Unknown RawFrm operand!");
}
@ -287,13 +485,17 @@ void Emitter::emitInstruction(MachineInstr &MI) {
unsigned Size = sizeOfPtr(Desc);
if (Value *V = MO1.getVRegValueOrNull()) {
assert(Size == 4 && "Don't know how to emit non-pointer values!");
MCE.emitGlobalAddress(cast<GlobalValue>(V), false);
emitGlobalAddressForPtr(cast<GlobalValue>(V));
} else if (MO1.isGlobalAddress()) {
assert(Size == 4 && "Don't know how to emit non-pointer values!");
MCE.emitGlobalAddress(MO1.getGlobal(), MO1.isPCRelative());
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!");
MCE.emitGlobalAddress(MO1.getSymbolName(), MO1.isPCRelative());
unsigned Address = MCE.getGlobalValueAddress(MO1.getSymbolName());
assert(Address && "Unknown external symbol!");
emitMaybePCRelativeValue(Address, MO1.isPCRelative());
} else {
emitConstant(MO1.getImmedValue(), Size);
}