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Add support for the Objective-C personality function to the instruction

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combining of the landingpad instruction. The ObjC personality function acts
almost identically to the C++ personality function. In particular, it uses
"null" as a "catch-all" value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142256 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-10-17 21:20:24 +00:00
parent 6f9c28060f
commit 76f267df17
2 changed files with 57 additions and 2 deletions
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7
lib/Transforms/InstCombine/InstructionCombining.cpp
View File

@ -1414,7 +1414,8 @@ Instruction *InstCombiner::visitExtractValueInst(ExtractValueInst &EV) {
enum Personality_Type {
Unknown_Personality,
GNU_Ada_Personality,
GNU_CXX_Personality
GNU_CXX_Personality,
GNU_ObjC_Personality
};
/// RecognizePersonality - See if the given exception handling personality
@ -1426,7 +1427,8 @@ static Personality_Type RecognizePersonality(Value *Pers) {
return Unknown_Personality;
return StringSwitch<Personality_Type>(F->getName())
.Case("__gnat_eh_personality", GNU_Ada_Personality)
.Case("__gxx_personality_v0", GNU_CXX_Personality)
.Case("__gxx_personality_v0", GNU_CXX_Personality)
.Case("__objc_personality_v0", GNU_ObjC_Personality)
.Default(Unknown_Personality);
}
@ -1440,6 +1442,7 @@ static bool isCatchAll(Personality_Type Personality, Constant *TypeInfo) {
// match foreign exceptions (or didn't, before gcc-4.7).
return false;
case GNU_CXX_Personality:
case GNU_ObjC_Personality:
return TypeInfo->isNullValue();
}
llvm_unreachable("Unknown personality!");

52
test/Transforms/InstCombine/LandingPadClauses.ll
View File

@ -6,6 +6,7 @@
declare i32 @generic_personality(i32, i64, i8*, i8*)
declare i32 @__gxx_personality_v0(i32, i64, i8*, i8*)
declare i32 @__objc_personality_v0(i32, i64, i8*, i8*)
declare void @bar()
@ -179,3 +180,54 @@ lpad.d:
; CHECK-NEXT: null
; CHECK-NEXT: unreachable
}
define void @foo_objc() {
; CHECK: @foo_objc
invoke void @bar()
to label %cont.a unwind label %lpad.a
cont.a:
invoke void @bar()
to label %cont.b unwind label %lpad.b
cont.b:
invoke void @bar()
to label %cont.c unwind label %lpad.c
cont.c:
invoke void @bar()
to label %cont.d unwind label %lpad.d
cont.d:
ret void
lpad.a:
%a = landingpad { i8*, i32 } personality i32 (i32, i64, i8*, i8*)* @__objc_personality_v0
catch i32* null
catch i32* @T1
unreachable
; CHECK: %a = landingpad
; CHECK-NEXT: null
; CHECK-NEXT: unreachable
lpad.b:
%b = landingpad { i8*, i32 } personality i32 (i32, i64, i8*, i8*)* @__objc_personality_v0
filter [1 x i32*] zeroinitializer
unreachable
; CHECK: %b = landingpad
; CHECK-NEXT: cleanup
; CHECK-NEXT: unreachable
lpad.c:
%c = landingpad { i8*, i32 } personality i32 (i32, i64, i8*, i8*)* @__objc_personality_v0
filter [2 x i32*] [i32* @T1, i32* null]
unreachable
; CHECK: %c = landingpad
; CHECK-NEXT: cleanup
; CHECK-NEXT: unreachable
lpad.d:
%d = landingpad { i8*, i32 } personality i32 (i32, i64, i8*, i8*)* @__objc_personality_v0
cleanup
catch i32* null
unreachable
; CHECK: %d = landingpad
; CHECK-NEXT: null
; CHECK-NEXT: unreachable
}