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Currently EH lowering code expects typeinfo to be global only.

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This assumption is not satisfied due to global mergeing.
Workaround the issue by temporary disablinge mergeing of const globals.
Also, ignore LLVM "special" globals. This fixes PR7716

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109423 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2010-07-26 18:45:39 +00:00
parent 88dafec7f9
commit b5a0ef99f8
2 changed files with 106 additions and 2 deletions
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13
lib/Target/ARM/ARMGlobalMerge.cpp
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@ -178,6 +178,11 @@ bool ARMGlobalMerge::doInitialization(Module& M) {
if (I->getAlignment() != 0)
continue;
// Ignore all 'special' globals.
if (I->getName().startswith("llvm.") ||
I->getName().startswith(".llvm."))
continue;
if (TD->getTypeAllocSize(I->getType()) < MaxOffset) {
if (I->isConstant())
ConstGlobals.push_back(I);
@ -188,8 +193,12 @@ bool ARMGlobalMerge::doInitialization(Module& M) {
if (Globals.size() > 1)
Changed |= doMerge(Globals, M, false);
if (ConstGlobals.size() > 1)
Changed |= doMerge(ConstGlobals, M, true);
// FIXME: This currently breaks the EH processing due to way how the
// typeinfo detection works. We might want to detect the TIs and ignore
// them in the future.
// if (ConstGlobals.size() > 1)
// Changed |= doMerge(ConstGlobals, M, true);
return Changed;
}

95
test/CodeGen/ARM/2010-07-26-GlobalMerge.ll Normal file
View File

@ -0,0 +1,95 @@
; RUN: llc -enable-correct-eh-support < %s
; PR7716
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
target triple = "thumbv7-apple-darwin10.0.0"
%0 = type { i8*, i8* }
%struct.A = type { i32 }
@d = internal global i32 0, align 4 ; <i32*> [#uses=6]
@_ZTVN10__cxxabiv117__class_type_infoE = external global i8* ; <i8**> [#uses=1]
@_ZTS1A = internal constant [3 x i8] c"1A\00" ; <[3 x i8]*> [#uses=1]
@_ZTI1A = internal constant %0 { i8* bitcast (i8** getelementptr inbounds (i8** @_ZTVN10__cxxabiv117__class_type_infoE, i32 2) to i8*), i8* getelementptr inbounds ([3 x i8]* @_ZTS1A, i32 0, i32 0) } ; <%0*> [#uses=1]
@.str2 = private constant [18 x i8] c"c == %d, d == %d\0A\00" ; <[18 x i8]*> [#uses=1]
@.str3 = private constant [16 x i8] c"A(const A&) %d\0A\00" ; <[16 x i8]*> [#uses=1]
@.str4 = private constant [9 x i8] c"~A() %d\0A\00" ; <[9 x i8]*> [#uses=1]
@.str5 = private constant [8 x i8] c"A() %d\0A\00" ; <[8 x i8]*> [#uses=1]
@str = internal constant [14 x i8] c"Throwing 1...\00" ; <[14 x i8]*> [#uses=1]
@str1 = internal constant [8 x i8] c"Caught.\00" ; <[8 x i8]*> [#uses=1]
declare i32 @printf(i8* nocapture, ...) nounwind
declare i8* @__cxa_allocate_exception(i32)
declare i8* @llvm.eh.exception() nounwind readonly
declare i32 @__gxx_personality_sj0(...)
declare i32 @llvm.eh.selector(i8*, i8*, ...) nounwind
declare i32 @llvm.eh.typeid.for(i8*) nounwind
declare void @_Unwind_SjLj_Resume(i8*)
define internal void @_ZN1AD1Ev(%struct.A* nocapture %this) nounwind ssp align 2 {
entry:
%tmp.i = getelementptr inbounds %struct.A* %this, i32 0, i32 0 ; <i32*> [#uses=1]
%tmp2.i = load i32* %tmp.i ; <i32> [#uses=1]
%call.i = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([9 x i8]* @.str4, i32 0, i32 0), i32 %tmp2.i) nounwind ; <i32> [#uses=0]
%tmp3.i = load i32* @d ; <i32> [#uses=1]
%inc.i = add nsw i32 %tmp3.i, 1 ; <i32> [#uses=1]
store i32 %inc.i, i32* @d
ret void
}
declare void @__cxa_throw(i8*, i8*, i8*)
define i32 @main() ssp {
entry:
%puts.i = tail call i32 @puts(i8* getelementptr inbounds ([14 x i8]* @str, i32 0, i32 0)) ; <i32> [#uses=0]
%exception.i = tail call i8* @__cxa_allocate_exception(i32 4) nounwind ; <i8*> [#uses=2]
%tmp2.i.i.i = bitcast i8* %exception.i to i32* ; <i32*> [#uses=1]
store i32 1, i32* %tmp2.i.i.i
%call.i.i.i = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([8 x i8]* @.str5, i32 0, i32 0), i32 1) nounwind ; <i32> [#uses=0]
invoke void @__cxa_throw(i8* %exception.i, i8* bitcast (%0* @_ZTI1A to i8*), i8* bitcast (void (%struct.A*)* @_ZN1AD1Ev to i8*)) noreturn
to label %.noexc unwind label %lpad
.noexc: ; preds = %entry
unreachable
try.cont: ; preds = %lpad
%0 = tail call i8* @__cxa_get_exception_ptr(i8* %exn) nounwind ; <i8*> [#uses=0]
%call.i.i = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([16 x i8]* @.str3, i32 0, i32 0), i32 2) nounwind ; <i32> [#uses=0]
%1 = tail call i8* @__cxa_begin_catch(i8* %exn) nounwind ; <i8*> [#uses=0]
%puts = tail call i32 @puts(i8* getelementptr inbounds ([8 x i8]* @str1, i32 0, i32 0)) ; <i32> [#uses=0]
%call.i.i3 = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([9 x i8]* @.str4, i32 0, i32 0), i32 2) nounwind ; <i32> [#uses=0]
%tmp3.i.i = load i32* @d ; <i32> [#uses=1]
%inc.i.i4 = add nsw i32 %tmp3.i.i, 1 ; <i32> [#uses=1]
store i32 %inc.i.i4, i32* @d
tail call void @__cxa_end_catch()
%tmp13 = load i32* @d ; <i32> [#uses=1]
%call14 = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([18 x i8]* @.str2, i32 0, i32 0), i32 2, i32 %tmp13) ; <i32> [#uses=0]
%tmp16 = load i32* @d ; <i32> [#uses=1]
%cmp = icmp ne i32 %tmp16, 2 ; <i1> [#uses=1]
%conv = zext i1 %cmp to i32 ; <i32> [#uses=1]
ret i32 %conv
lpad: ; preds = %entry
%exn = tail call i8* @llvm.eh.exception() nounwind ; <i8*> [#uses=4]
%eh.selector = tail call i32 (i8*, i8*, ...)* @llvm.eh.selector(i8* %exn, i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*), i8* bitcast (%0* @_ZTI1A to i8*), i8* null) nounwind ; <i32> [#uses=1]
%2 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%0* @_ZTI1A to i8*)) nounwind ; <i32> [#uses=1]
%3 = icmp eq i32 %eh.selector, %2 ; <i1> [#uses=1]
br i1 %3, label %try.cont, label %eh.resume
eh.resume: ; preds = %lpad
tail call void @_Unwind_SjLj_Resume(i8* %exn) noreturn
unreachable
}
declare i8* @__cxa_get_exception_ptr(i8*)
declare i8* @__cxa_begin_catch(i8*)
declare void @__cxa_end_catch()
declare i32 @puts(i8* nocapture) nounwind