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8f32e5f0d6
Summary: Initially, these intrinsics seemed like part of a family of "frame" related intrinsics, but now I think that's more confusing than helpful. Initially, the LangRef specified that this would create a new kind of allocation that would be allocated at a fixed offset from the frame pointer (EBP/RBP). We ended up dropping that design, and leaving the stack frame layout alone. These intrinsics are really about sharing local stack allocations, not frame pointers. I intend to go further and add an `llvm.localaddress()` intrinsic that returns whatever register (EBP, ESI, ESP, RBX) is being used to address locals, which should not be confused with the frame pointer. Naming suggestions at this point are welcome, I'm happy to re-run sed. Reviewers: majnemer, nicholas Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D11011 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241633 91177308-0d34-0410-b5e6-96231b3b80d8
100 lines
3.5 KiB
LLVM
100 lines
3.5 KiB
LLVM
; RUN: opt -mtriple=x86_64-pc-windows-msvc -winehprepare -S -o - < %s | FileCheck %s
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; This test was generated from the following source:
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;
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; class SomeClass {
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; public:
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; SomeClass();
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; ~SomeClass();
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; };
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;
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; void test() {
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; SomeClass obj;
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; may_throw();
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; }
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; ModuleID = 'min-unwind.cpp'
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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%class.SomeClass = type { [28 x i32] }
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; The function entry should be rewritten like this.
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; CHECK: define void @_Z4testv()
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; CHECK: entry:
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; CHECK: [[OBJ_PTR:\%.+]] = alloca %class.SomeClass, align 4
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; CHECK: call void @_ZN9SomeClassC1Ev(%class.SomeClass* [[OBJ_PTR]])
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; CHECK: call void (...) @llvm.localescape(%class.SomeClass* [[OBJ_PTR]])
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; CHECK: invoke void @_Z9may_throwv()
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; CHECK: to label %invoke.cont unwind label %[[LPAD_LABEL:lpad[0-9]*]]
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; Function Attrs: uwtable
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define void @_Z4testv() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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%obj = alloca %class.SomeClass, align 4
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%exn.slot = alloca i8*
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%ehselector.slot = alloca i32
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call void @_ZN9SomeClassC1Ev(%class.SomeClass* %obj)
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invoke void @_Z9may_throwv()
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to label %invoke.cont unwind label %lpad
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invoke.cont: ; preds = %entry
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call void @_ZN9SomeClassD1Ev(%class.SomeClass* %obj)
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ret void
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; CHECK: [[LPAD_LABEL]]:{{[ ]+}}; preds = %entry
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; CHECK: landingpad { i8*, i32 }
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; CHECK-NEXT: cleanup
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; CHECK-NEXT: [[RECOVER:\%.+]] = call i8* (...) @llvm.eh.actions(i32 0, void (i8*, i8*)* @_Z4testv.cleanup)
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; CHECK-NEXT: indirectbr i8* [[RECOVER]], []
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lpad: ; preds = %entry
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%tmp = landingpad { i8*, i32 }
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cleanup
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%tmp1 = extractvalue { i8*, i32 } %tmp, 0
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store i8* %tmp1, i8** %exn.slot
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%tmp2 = extractvalue { i8*, i32 } %tmp, 1
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store i32 %tmp2, i32* %ehselector.slot
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call void @_ZN9SomeClassD1Ev(%class.SomeClass* %obj)
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br label %eh.resume
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; CHECK-NOT: eh.resume:
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eh.resume: ; preds = %lpad
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%exn = load i8*, i8** %exn.slot
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%sel = load i32, i32* %ehselector.slot
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%lpad.val = insertvalue { i8*, i32 } undef, i8* %exn, 0
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%lpad.val2 = insertvalue { i8*, i32 } %lpad.val, i32 %sel, 1
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resume { i8*, i32 } %lpad.val2
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; CHECK: }
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}
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; This cleanup handler should be outlined.
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; CHECK: define internal void @_Z4testv.cleanup(i8*, i8*)
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; CHECK: entry:
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; CHECK: [[RECOVER_OBJ:\%.+]] = call i8* @llvm.localrecover(i8* bitcast (void ()* @_Z4testv to i8*), i8* %1, i32 0)
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; CHECK: [[OBJ_PTR1:\%.+]] = bitcast i8* [[RECOVER_OBJ]] to %class.SomeClass*
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; CHECK: call void @_ZN9SomeClassD1Ev(%class.SomeClass* [[OBJ_PTR1]])
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; CHECK: ret void
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; CHECK: }
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declare void @_ZN9SomeClassC1Ev(%class.SomeClass*) #1
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declare void @_Z9may_throwv() #1
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declare i32 @__CxxFrameHandler3(...)
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declare void @_ZN9SomeClassD1Ev(%class.SomeClass*) #1
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attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { noinline noreturn nounwind }
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attributes #3 = { noreturn nounwind }
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attributes #4 = { nounwind }
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!llvm.ident = !{!0}
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!0 = !{!"clang version 3.7.0 (trunk 226027)"}
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