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WinEH: Create a parent frame alloca for HandlerType xdata tables

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We don't have any logic to emit those tables yet, so the SDAG lowering
of this intrinsic is just a stub.  We can see the intrinsic in the
prepared IR, though.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2015-03-27 04:17:07 +00:00
parent 6284bcd95b
commit db573736fd
6 changed files with 49 additions and 1 deletions
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11
docs/ExceptionHandling.rst
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@ -551,6 +551,17 @@ This object is used by Windows native exception handling on non-x86 platforms
where xdata unwind information is used. It is typically an 8 byte chunk of
memory treated as two 32-bit integers.
``llvm.eh.parentframe``
----------------------
.. code-block:: llvm
void @llvm.eh.parentframe(i8*)
This intrinsic designates the provided static alloca as the object which holds
the address of the parent frame.
This object is used by Windows native exception handling on non-x86 platforms
where xdata unwind information is used.
SJLJ Intrinsics
---------------

4
include/llvm/IR/Intrinsics.td
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@ -425,6 +425,10 @@ def int_eh_actions : Intrinsic<[llvm_ptr_ty], [llvm_vararg_ty], []>;
// for WinEH.
def int_eh_unwindhelp : Intrinsic<[], [llvm_ptr_ty], []>;
// Designates the provided static alloca as the object which holds the address
// of the parent frame. Required for WinEH.
def int_eh_parentframe : Intrinsic<[], [llvm_ptrptr_ty], []>;
// __builtin_unwind_init is an undocumented GCC intrinsic that causes all
// callee-saved registers to be saved and restored (regardless of whether they
// are used) in the calling function. It is used by libgcc_eh.

12
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -5446,13 +5446,23 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
case Intrinsic::eh_begincatch:
case Intrinsic::eh_endcatch:
llvm_unreachable("begin/end catch intrinsics not lowered in codegen");
case Intrinsic::eh_parentframe: {
AllocaInst *Slot =
cast<AllocaInst>(I.getArgOperand(0)->stripPointerCasts());
assert(FuncInfo.StaticAllocaMap.count(Slot) &&
"can only use static allocas with llvm.eh.parentframe");
int FI = FuncInfo.StaticAllocaMap[Slot];
// TODO: Save this in the not-yet-existent WinEHFuncInfo struct.
(void)FI;
return nullptr;
}
case Intrinsic::eh_unwindhelp: {
AllocaInst *Slot =
cast<AllocaInst>(I.getArgOperand(0)->stripPointerCasts());
assert(FuncInfo.StaticAllocaMap.count(Slot) &&
"can only use static allocas with llvm.eh.unwindhelp");
int FI = FuncInfo.StaticAllocaMap[Slot];
// TODO: Save this in the not-yet-existant WinEHFuncInfo struct.
// TODO: Save this in the not-yet-existent WinEHFuncInfo struct.
(void)FI;
return nullptr;
}

10
lib/CodeGen/WinEHPrepare.cpp
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@ -695,6 +695,16 @@ bool WinEHPrepare::outlineHandler(ActionHandler *Action, Function *SrcFn,
if (!LPadMap.isInitialized())
LPadMap.mapLandingPad(LPad);
if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
// Insert an alloca for the object which holds the address of the parent's
// frame pointer. The stack offset of this object needs to be encoded in
// xdata.
AllocaInst *ParentFrame = new AllocaInst(Int8PtrType, "parentframe", Entry);
Builder.CreateStore(&Handler->getArgumentList().back(), ParentFrame,
/*isStore=*/true);
Function *ParentFrameFn =
Intrinsic::getDeclaration(M, Intrinsic::eh_parentframe);
Builder.CreateCall(ParentFrameFn, ParentFrame);
Constant *Sel = CatchAction->getSelector();
Director.reset(new WinEHCatchDirector(Handler, Sel, VarInfo, LPadMap));
LPadMap.remapSelector(VMap, ConstantInt::get(Type::getInt32Ty(Context), 1));

7
lib/IR/Verifier.cpp
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@ -2909,6 +2909,13 @@ void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
break;
}
case Intrinsic::eh_parentframe: {
auto *AI = dyn_cast<AllocaInst>(CI.getArgOperand(0)->stripPointerCasts());
Assert(AI && AI->isStaticAlloca(),
"llvm.eh.parentframe requires a static alloca", &CI);
break;
}
case Intrinsic::eh_unwindhelp: {
auto *AI = dyn_cast<AllocaInst>(CI.getArgOperand(0)->stripPointerCasts());
Assert(AI && AI->isStaticAlloca(),

6
test/CodeGen/WinEH/cppeh-catch-unwind.ll
View File

@ -180,6 +180,9 @@ eh.resume: ; preds = %catch.dispatch7
; CHECK-LABEL: define internal i8* @"\01?test@@YAXXZ.catch"(i8*, i8*) {
; CHECK: entry:
; CHECK: [[PARENTFRAME:\%.+]] = alloca i8*
; CHECK: store volatile i8* %1, i8** [[PARENTFRAME]]
; CHECK: call void @llvm.eh.parentframe(i8** [[PARENTFRAME]])
; CHECK: [[RECOVER_TMP1:\%.+]] = call i8* @llvm.framerecover(i8* bitcast (void ()* @"\01?test@@YAXXZ" to i8*), i8* %1, i32 0)
; CHECK: [[TMP1_PTR:\%.+]] = bitcast i8* [[RECOVER_TMP1]] to i32*
; CHECK: call void @"\01?handle_exception@@YAXXZ"()
@ -196,6 +199,9 @@ eh.resume: ; preds = %catch.dispatch7
; CHECK-LABEL: define internal i8* @"\01?test@@YAXXZ.catch1"(i8*, i8*) {
; CHECK: entry:
; CHECK: [[PARENTFRAME:\%.+]] = alloca i8*
; CHECK: store volatile i8* %1, i8** [[PARENTFRAME]]
; CHECK: call void @llvm.eh.parentframe(i8** [[PARENTFRAME]])
; CHECK: [[RECOVER_TMP0:\%.+]] = call i8* @llvm.framerecover(i8* bitcast (void ()* @"\01?test@@YAXXZ" to i8*), i8* %1, i32 2)
; CHECK: [[TMP0_PTR:\%.+]] = bitcast i8* [[RECOVER_TMP0]] to i32*
; CHECK: invoke void @"\01?handle_exception@@YAXXZ"()