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llvm-6502/test/CodeGen/WinEH/cppeh-inalloca.ll
Reid Kleckner 8f32e5f0d6 Rename llvm.frameescape and llvm.framerecover to localescape and localrecover 
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
2015-07-07 22:25:32 +00:00

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; RUN: opt -mtriple=x86_64-pc-windows-msvc -winehprepare -S -o - < %s | FileCheck %s
; This test is built from the following code:
; struct A {
; A(int a);
; A(const A &o);
; ~A();
; int a;
; };
;
; void may_throw();
;
; int test(A a) {
; try {
; may_throw();
; }
; catch (int e) {
; return a.a + e;
; }
; return 0;
; }
;
; The test was built for a 32-bit Windows target and then the reference to
; the inalloca instruction was manually sunk into the landingpad.
; ModuleID = 'cppeh-inalloca.cpp'
%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
%struct.A = type { i32 }
$"\01??_R0H@8" = comdat any
@"\01??_7type_info@@6B@" = external constant i8*
@"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
; The function entry should be rewritten like this.
; CHECK: define i32 @"\01?test@@YAHUA@@@Z"(<{ %struct.A }>* inalloca)
; CHECK: entry:
; CHECK: [[TMP_REGMEM:\%.+]] = alloca <{ %struct.A }>*
; CHECK: store <{ %struct.A }>* %0, <{ %struct.A }>** [[TMP_REGMEM]]
; CHECK: [[RETVAL:\%.+]] = alloca i32, align 4
; CHECK: [[E_PTR:\%.+]] = alloca i32, align 4
; CHECK: [[CLEANUP_SLOT:\%.+]] = alloca i32
; CHECK: call void (...) @llvm.localescape(i32* %e, <{ %struct.A }>** [[TMP_REGMEM]], i32* [[RETVAL]], i32* [[CLEANUP_SLOT]])
; CHECK: invoke void @"\01?may_throw@@YAXXZ"()
; CHECK: to label %invoke.cont unwind label %[[LPAD_LABEL:lpad[0-9]*]]
define i32 @"\01?test@@YAHUA@@@Z"(<{ %struct.A }>* inalloca) #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
entry:
%retval = alloca i32, align 4
%exn.slot = alloca i8*
%ehselector.slot = alloca i32
%e = alloca i32, align 4
%cleanup.dest.slot = alloca i32
invoke void @"\01?may_throw@@YAXXZ"()
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %entry
br label %try.cont
; CHECK: [[LPAD_LABEL]]:{{[ ]+}}; preds = %entry
; CHECK: landingpad { i8*, i32 }
; CHECK-NEXT: cleanup
; CHECK-NEXT: catch i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*)
; CHECK-NEXT: [[RECOVER:\%recover.*]] = call i8* (...) @llvm.eh.actions(i32 1, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*), i32 0, i8* (i8*, i8*)* @"\01?test@@YAHUA@@@Z.catch", i32 0, void (i8*, i8*)* @"\01?test@@YAHUA@@@Z.cleanup")
; CHECK-NEXT: indirectbr i8* [[RECOVER]], [label %cleanup]
lpad: ; preds = %entry
%1 = landingpad { i8*, i32 }
cleanup
catch i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*)
%2 = extractvalue { i8*, i32 } %1, 0
store i8* %2, i8** %exn.slot
%3 = extractvalue { i8*, i32 } %1, 1
store i32 %3, i32* %ehselector.slot
br label %catch.dispatch
; CHECK-NOT: catch.dispatch:
catch.dispatch: ; preds = %lpad
%sel = load i32, i32* %ehselector.slot
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*)) #3
%matches = icmp eq i32 %sel, %4
br i1 %matches, label %catch, label %ehcleanup
; CHECK-NOT: catch:
catch: ; preds = %catch.dispatch
%exn = load i8*, i8** %exn.slot
%e.i8 = bitcast i32* %e to i8*
call void @llvm.eh.begincatch(i8* %exn, i8* %e.i8) #3
%a = getelementptr inbounds <{ %struct.A }>, <{ %struct.A }>* %0, i32 0, i32 0
%a1 = getelementptr inbounds %struct.A, %struct.A* %a, i32 0, i32 0
%tmp8 = load i32, i32* %a1, align 4
%tmp9 = load i32, i32* %e, align 4
%add = add nsw i32 %tmp8, %tmp9
store i32 %add, i32* %retval
store i32 1, i32* %cleanup.dest.slot
call void @llvm.eh.endcatch() #3
br label %cleanup
try.cont: ; preds = %invoke.cont
store i32 0, i32* %retval
store i32 1, i32* %cleanup.dest.slot
br label %cleanup
; The cleanup block should be re-written like this.
; CHECK: cleanup:{{[ ]+}}; preds = %[[LPAD_LABEL]], %try.cont
; CHECK: %a2 = getelementptr inbounds <{ %struct.A }>, <{ %struct.A }>* %0, i32 0, i32 0
; CHECK: call x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A* %a2)
; CHECK: [[TMP1:\%.+]] = load i32, i32* [[RETVAL]]
; CHECK: ret i32 [[TMP1]]
cleanup: ; preds = %try.cont, %catch
%a2 = getelementptr inbounds <{ %struct.A }>, <{ %struct.A }>* %0, i32 0, i32 0
call x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A* %a2) #3
%tmp10 = load i32, i32* %retval
ret i32 %tmp10
; CHECK-NOT: ehcleanup:
ehcleanup: ; preds = %catch.dispatch
%a3 = getelementptr inbounds <{ %struct.A }>, <{ %struct.A }>* %0, i32 0, i32 0
call x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A* %a3) #3
br label %eh.resume
; CHECK-NOT: eh.resume:
eh.resume: ; preds = %ehcleanup
%exn2 = load i8*, i8** %exn.slot
%sel3 = load i32, i32* %ehselector.slot
%lpad.val = insertvalue { i8*, i32 } undef, i8* %exn2, 0
%lpad.val4 = insertvalue { i8*, i32 } %lpad.val, i32 %sel3, 1
resume { i8*, i32 } %lpad.val4
; CHECK: }
}
; The following catch handler should be outlined.
; CHECK: define internal i8* @"\01?test@@YAHUA@@@Z.catch"(i8*, i8*)
; CHECK: entry:
; CHECK: [[RECOVER_E:\%.+]] = call i8* @llvm.localrecover(i8* bitcast (i32 (<{ %struct.A }>*)* @"\01?test@@YAHUA@@@Z" to i8*), i8* %1, i32 0)
; CHECK: [[E_PTR:\%.+]] = bitcast i8* [[RECOVER_E]] to i32*
; CHECK: [[RECOVER_EH_TEMP:\%.+]] = call i8* @llvm.localrecover(i8* bitcast (i32 (<{ %struct.A }>*)* @"\01?test@@YAHUA@@@Z" to i8*), i8* %1, i32 1)
; CHECK: [[EH_TEMP:\%.+]] = bitcast i8* [[RECOVER_EH_TEMP]] to <{ %struct.A }>**
; CHECK: [[RECOVER_RETVAL:\%.+]] = call i8* @llvm.localrecover(i8* bitcast (i32 (<{ %struct.A }>*)* @"\01?test@@YAHUA@@@Z" to i8*), i8* %1, i32 2)
; CHECK: [[RETVAL1:\%.+]] = bitcast i8* [[RECOVER_RETVAL]] to i32*
; CHECK: [[RECOVER_CLEANUPSLOT:\%.+]] = call i8* @llvm.localrecover(i8* bitcast (i32 (<{ %struct.A }>*)* @"\01?test@@YAHUA@@@Z" to i8*), i8* %1, i32 3)
; CHECK: [[CLEANUPSLOT1:\%.+]] = bitcast i8* [[RECOVER_CLEANUPSLOT]] to i32*
; CHECK: [[E_I8PTR:\%.+]] = bitcast i32* [[E_PTR]] to i8*
; CHECK: [[TMP_RELOAD:\%.+]] = load <{ %struct.A }>*, <{ %struct.A }>** [[EH_TEMP]]
; CHECK: [[RECOVER_A:\%.+]] = getelementptr inbounds <{ %struct.A }>, <{ %struct.A }>* [[TMP_RELOAD]], i32 0, i32 0
; CHECK: [[A1:\%.+]] = getelementptr inbounds %struct.A, %struct.A* [[RECOVER_A]], i32 0, i32 0
; CHECK: [[TMP2:\%.+]] = load i32, i32* [[A1]], align 4
; CHECK: [[TMP3:\%.+]] = load i32, i32* [[E_PTR]], align 4
; CHECK: [[ADD:\%.+]] = add nsw i32 [[TMP2]], [[TMP3]]
; CHECK: store i32 [[ADD]], i32* [[RETVAL1]]
; CHECK: store i32 1, i32* [[CLEANUPSLOT1]]
; CHECK: ret i8* blockaddress(@"\01?test@@YAHUA@@@Z", %cleanup)
; CHECK: }
; The following cleanup handler should be outlined.
; CHECK: define internal void @"\01?test@@YAHUA@@@Z.cleanup"(i8*, i8*)
; CHECK: entry:
; CHECK: [[RECOVER_EH_TEMP1:\%.+]] = call i8* @llvm.localrecover(i8* bitcast (i32 (<{ %struct.A }>*)* @"\01?test@@YAHUA@@@Z" to i8*), i8* %1, i32 1)
; CHECK: [[EH_TEMP1:\%.+]] = bitcast i8* [[RECOVER_EH_TEMP]] to <{ %struct.A }>**
; CHECK: [[TMP_RELOAD1:\%.+]] = load <{ %struct.A }>*, <{ %struct.A }>** [[EH_TEMP1]]
; CHECK: [[A3:\%.+]] = getelementptr inbounds <{ %struct.A }>, <{ %struct.A }>* [[TMP_RELOAD1]], i32 0, i32 0
; CHECK: call x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A* [[A3]])
; CHECK: ret void
; CHECK: }
declare void @"\01?may_throw@@YAXXZ"() #0
declare i32 @__CxxFrameHandler3(...)
; Function Attrs: nounwind readnone
declare i32 @llvm.eh.typeid.for(i8*) #1
declare void @llvm.eh.begincatch(i8*, i8*)
declare void @llvm.eh.endcatch()
; Function Attrs: nounwind
declare x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A*) #2
attributes #0 = { "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" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind "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" }
attributes #3 = { nounwind }
!llvm.ident = !{!0}
!0 = !{!"clang version 3.7.0 (trunk 228868)"}
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