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Tailcalls require stubs to be emitted. Otherwise, the compilation callback

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doesn't know who 'called' it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22136 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-05-19 05:54:33 +00:00
parent 6a5d1d42b7
commit 16cb6f82eb
2 changed files with 16 additions and 9 deletions
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23
lib/Target/X86/X86CodeEmitter.cpp
View File

@ -53,9 +53,10 @@ namespace {
void emitPCRelativeBlockAddress(const MachineBasicBlock *BB);
void emitPCRelativeValue(unsigned Address);
void emitGlobalAddressForCall(GlobalValue *GV);
void emitGlobalAddressForCall(GlobalValue *GV, bool isTailCall);
void emitGlobalAddressForPtr(GlobalValue *GV, int Disp = 0);
void emitExternalSymbolAddress(const char *ES, bool isPCRelative);
void emitExternalSymbolAddress(const char *ES, bool isPCRelative,
bool isTailCall);
void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
@ -139,9 +140,10 @@ void Emitter::emitPCRelativeBlockAddress(const MachineBasicBlock *MBB) {
/// 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) {
void Emitter::emitGlobalAddressForCall(GlobalValue *GV, bool isTailCall) {
MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
X86::reloc_pcrel_word, GV, 0, true));
X86::reloc_pcrel_word, GV, 0,
!isTailCall /*Doesn'tNeedStub*/));
MCE.emitWord(0);
}
@ -158,7 +160,8 @@ void Emitter::emitGlobalAddressForPtr(GlobalValue *GV, int Disp /* = 0 */) {
/// 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) {
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.emitWord(0);
@ -394,9 +397,13 @@ void Emitter::emitInstruction(const MachineInstr &MI) {
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()) {
emitExternalSymbolAddress(MO.getSymbolName(), true);
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 {
@ -421,7 +428,7 @@ void Emitter::emitInstruction(const MachineInstr &MI) {
} else if (MO1.isExternalSymbol()) {
assert(sizeOfImm(Desc) == 4 &&
"Don't know how to emit non-pointer values!");
emitExternalSymbolAddress(MO1.getSymbolName(), false);
emitExternalSymbolAddress(MO1.getSymbolName(), false, false);
} else {
emitConstant(MO1.getImmedValue(), sizeOfImm(Desc));
}

2
lib/Target/X86/X86ISelPattern.cpp
View File

@ -3918,7 +3918,7 @@ void ISel::EmitFastCCToFastCCTailCall(SDNode *TailCallNode) {
if (!isDirect) {
BuildMI(BB, X86::TAILJMPr, 1).addReg(CalleeReg);
} else if (GlobalAddressSDNode *GASD = dyn_cast<GlobalAddressSDNode>(Callee)){
BuildMI(BB, X86::TAILJMPd, 1).addGlobalAddress(GASD->getGlobal(),true);
BuildMI(BB, X86::TAILJMPd, 1).addGlobalAddress(GASD->getGlobal(), true);
} else {
ExternalSymbolSDNode *ESSDN = cast<ExternalSymbolSDNode>(Callee);
BuildMI(BB, X86::TAILJMPd, 1).addExternalSymbol(ESSDN->getSymbol(), true);