Create and use an llvm.eh.sjlj.functioncontext intrinsic.

This intrinsic is used to pass the index of the function context to the back-end
for further processing. The back-end is in charge of filling in the rest of the
entries.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-09-28 03:36:43 +00:00
parent 2b6bd7ba58
commit 6ef94175d1
4 changed files with 29 additions and 4 deletions

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@ -174,6 +174,10 @@ class MachineFrameInfo {
/// StackProtectorIdx - The frame index for the stack protector. /// StackProtectorIdx - The frame index for the stack protector.
int StackProtectorIdx; int StackProtectorIdx;
/// FunctionContextIdx - The frame index for the function context. Used for
/// SjLj exceptions.
int FunctionContextIdx;
/// MaxCallFrameSize - This contains the size of the largest call frame if the /// MaxCallFrameSize - This contains the size of the largest call frame if the
/// target uses frame setup/destroy pseudo instructions (as defined in the /// target uses frame setup/destroy pseudo instructions (as defined in the
/// TargetFrameInfo class). This information is important for frame pointer /// TargetFrameInfo class). This information is important for frame pointer
@ -220,6 +224,7 @@ public:
AdjustsStack = false; AdjustsStack = false;
HasCalls = false; HasCalls = false;
StackProtectorIdx = -1; StackProtectorIdx = -1;
FunctionContextIdx = -1;
MaxCallFrameSize = 0; MaxCallFrameSize = 0;
CSIValid = false; CSIValid = false;
LocalFrameSize = 0; LocalFrameSize = 0;
@ -244,6 +249,11 @@ public:
int getStackProtectorIndex() const { return StackProtectorIdx; } int getStackProtectorIndex() const { return StackProtectorIdx; }
void setStackProtectorIndex(int I) { StackProtectorIdx = I; } void setStackProtectorIndex(int I) { StackProtectorIdx = I; }
/// getFunctionContextIndex/setFunctionContextIndex - Return the index for the
/// function context object. This object is used for SjLj exceptions.
int getFunctionContextIndex() const { return FunctionContextIdx; }
void setFunctionContextIndex(int I) { FunctionContextIdx = I; }
/// isFrameAddressTaken - This method may be called any time after instruction /// isFrameAddressTaken - This method may be called any time after instruction
/// selection is complete to determine if there is a call to /// selection is complete to determine if there is a call to
/// \@llvm.frameaddress in this function. /// \@llvm.frameaddress in this function.

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@ -322,12 +322,13 @@ def int_eh_unwind_init: Intrinsic<[]>,
def int_eh_dwarf_cfa : Intrinsic<[llvm_ptr_ty], [llvm_i32_ty]>; def int_eh_dwarf_cfa : Intrinsic<[llvm_ptr_ty], [llvm_i32_ty]>;
let Properties = [IntrNoMem] in { let Properties = [IntrNoMem] in {
def int_eh_sjlj_lsda : Intrinsic<[llvm_ptr_ty]>; def int_eh_sjlj_lsda : Intrinsic<[llvm_ptr_ty]>;
def int_eh_sjlj_callsite: Intrinsic<[], [llvm_i32_ty]>; def int_eh_sjlj_callsite : Intrinsic<[], [llvm_i32_ty]>;
def int_eh_sjlj_functioncontext : Intrinsic<[], [llvm_ptr_ty]>;
} }
def int_eh_sjlj_dispatch_setup : Intrinsic<[], [llvm_i32_ty]>; def int_eh_sjlj_dispatch_setup : Intrinsic<[], [llvm_i32_ty]>;
def int_eh_sjlj_setjmp : Intrinsic<[llvm_i32_ty], [llvm_ptr_ty]>; def int_eh_sjlj_setjmp : Intrinsic<[llvm_i32_ty], [llvm_ptr_ty]>;
def int_eh_sjlj_longjmp : Intrinsic<[], [llvm_ptr_ty]>; def int_eh_sjlj_longjmp : Intrinsic<[], [llvm_ptr_ty]>;
//===---------------- Generic Variable Attribute Intrinsics----------------===// //===---------------- Generic Variable Attribute Intrinsics----------------===//
// //

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@ -4754,6 +4754,14 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
MMI.setCurrentCallSite(CI->getZExtValue()); MMI.setCurrentCallSite(CI->getZExtValue());
return 0; return 0;
} }
case Intrinsic::eh_sjlj_functioncontext: {
// Get and store the index of the function context.
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
AllocaInst *FnCtx = cast<AllocaInst>(I.getArgOperand(0));
int FI = FuncInfo.StaticAllocaMap[FnCtx];
MFI->setFunctionContextIndex(FI);
return 0;
}
case Intrinsic::eh_sjlj_setjmp: { case Intrinsic::eh_sjlj_setjmp: {
setValue(&I, DAG.getNode(ISD::EH_SJLJ_SETJMP, dl, MVT::i32, getRoot(), setValue(&I, DAG.getNode(ISD::EH_SJLJ_SETJMP, dl, MVT::i32, getRoot(),
getValue(I.getArgOperand(0)))); getValue(I.getArgOperand(0))));

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@ -721,6 +721,12 @@ void SjLjEHPass::setupFunctionContext(Function &F,
AllocaInst *FuncCtx = AllocaInst *FuncCtx =
new AllocaInst(FunctionContextTy, 0, Align, "fn_context", EntryBB->begin()); new AllocaInst(FunctionContextTy, 0, Align, "fn_context", EntryBB->begin());
// Store a pointer to the function context so that the back-end will know
// where to look for it.
CallInst::Create(Intrinsic::getDeclaration(F.getParent(),
Intrinsic::eh_sjlj_functioncontext),
FuncCtx, "", EntryBB->getTerminator());
// Fill in the function context structure. // Fill in the function context structure.
Value *Idxs[2]; Value *Idxs[2];
Type *Int32Ty = Type::getInt32Ty(F.getContext()); Type *Int32Ty = Type::getInt32Ty(F.getContext());