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Cygwin support. Patch by Anton Korobeynikov!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28672 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -129,6 +129,8 @@ namespace {
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SDOperand &Base, SDOperand &Scale,
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SDOperand &Index, SDOperand &Disp);
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void EmitSpecialCodeForMain(MachineBasicBlock *BB, MachineFrameInfo *MFI);
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inline void getAddressOperands(X86ISelAddressMode &AM, SDOperand &Base,
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SDOperand &Scale, SDOperand &Index,
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SDOperand &Disp) {
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@ -250,8 +252,11 @@ void X86DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
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/// EmitSpecialCodeForMain - Emit any code that needs to be executed only in
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/// the main function.
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static void EmitSpecialCodeForMain(MachineBasicBlock *BB,
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MachineFrameInfo *MFI) {
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void X86DAGToDAGISel::EmitSpecialCodeForMain(MachineBasicBlock *BB,
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MachineFrameInfo *MFI) {
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if (Subtarget->TargetType == X86Subtarget::isCygwin)
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BuildMI(BB, X86::CALLpcrel32, 1).addExternalSymbol("__main");
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// Switch the FPU to 64-bit precision mode for better compatibility and speed.
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int CWFrameIdx = MFI->CreateStackObject(2, 2);
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addFrameReference(BuildMI(BB, X86::FNSTCW16m, 4), CWFrameIdx);
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@ -14,9 +14,12 @@
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#include "X86.h"
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#include "X86RegisterInfo.h"
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#include "X86Subtarget.h"
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#include "X86TargetMachine.h"
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#include "X86InstrBuilder.h"
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#include "llvm/Constants.h"
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#include "llvm/Type.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineFunction.h"
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@ -635,7 +638,14 @@ X86RegisterInfo::getCalleeSaveRegClasses() const {
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// if frame pointer elimination is disabled.
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//
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static bool hasFP(MachineFunction &MF) {
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return NoFramePointerElim || MF.getFrameInfo()->hasVarSizedObjects();
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const Function* Fn = MF.getFunction();
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const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
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return (NoFramePointerElim ||
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MF.getFrameInfo()->hasVarSizedObjects() ||
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(Fn->hasExternalLinkage() &&
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Fn->getName() == "main" &&
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Subtarget->TargetType == X86Subtarget::isCygwin));
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}
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void X86RegisterInfo::
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@ -730,6 +740,9 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
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MachineBasicBlock::iterator MBBI = MBB.begin();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
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const Function* Fn = MF.getFunction();
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const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
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MachineInstr *MI;
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// Get the number of bytes to allocate from the FrameInfo
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@ -744,7 +757,6 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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// Round the size to a multiple of the alignment (don't forget the 4 byte
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// offset though).
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unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
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NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
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}
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@ -775,6 +787,13 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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MBB.insert(MBBI, MI);
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}
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// If it's main() on Cygwin\Mingw32 we should align stack as well
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if (Fn->hasExternalLinkage() && Fn->getName() == "main" &&
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Subtarget->TargetType == X86Subtarget::isCygwin) {
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MI = BuildMI(X86::AND32ri, 2, X86::ESP).addImm(-Align);
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MBB.insert(MBBI, MI);
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}
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}
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void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
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