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a9ac81b53d
Catch objects with a displacement of zero do not initialize a catch object. The displacement is relative to %rsp at the end of the function's prologue for x86_64 targets. If we place an object at the top-of-stack, we will end up wit a displacement of zero resulting in our catch object remaining uninitialized. Address this by creating our catch objects as fixed objects. We will ensure that the UnwindHelp object is created after the catch objects so that no catch object will have a displacement of zero. Differential Revision: http://reviews.llvm.org/D17823 llvm-svn: 262546
92 lines
2.7 KiB
LLVM
92 lines
2.7 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "x86_64-pc-windows-msvc"
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declare void @throw()
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declare i32 @__CxxFrameHandler3(...)
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define void @test1() personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%alloca2 = alloca i8*, align 4
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%alloca1 = alloca i8*, align 4
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store volatile i8* null, i8** %alloca1
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invoke void @throw()
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to label %unreachable unwind label %catch.dispatch
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; CHECK-LABEL: test1:
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; CHECK: movq $0, -8(%rbp)
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; CHECK: callq throw
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catch.dispatch: ; preds = %entry
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%cs = catchswitch within none [label %catch.pad] unwind to caller
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catch.pad: ; preds = %catch.dispatch
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%cp = catchpad within %cs [i8* null, i32 0, i8** %alloca1]
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store volatile i8* null, i8** %alloca1
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%bc1 = bitcast i8** %alloca1 to i8*
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call void @llvm.lifetime.end(i64 4, i8* nonnull %bc1)
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%bc2 = bitcast i8** %alloca2 to i8*
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call void @llvm.lifetime.start(i64 4, i8* %bc2)
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store volatile i8* null, i8** %alloca1
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unreachable
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; CHECK-LABEL: "?catch$2@?0?test1@4HA"
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; CHECK: movq $0, -8(%rbp)
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; CHECK: movq $0, -8(%rbp)
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; CHECK: ud2
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unreachable: ; preds = %entry
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unreachable
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}
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; CHECK-LABEL: $cppxdata$test1:
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; CHECK: .long 56 # CatchObjOffset
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define void @test2() personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%alloca2 = alloca i8*, align 4
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%alloca1 = alloca i8*, align 4
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store volatile i8* null, i8** %alloca1
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invoke void @throw()
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to label %unreachable unwind label %catch.dispatch
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; CHECK-LABEL: test2:
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; CHECK: movq $0, -16(%rbp)
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; CHECK: callq throw
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catch.dispatch: ; preds = %entry
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%cs = catchswitch within none [label %catch.pad] unwind to caller
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catch.pad: ; preds = %catch.dispatch
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%cp = catchpad within %cs [i8* null, i32 0, i8** null]
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store volatile i8* null, i8** %alloca1
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%bc1 = bitcast i8** %alloca1 to i8*
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call void @llvm.lifetime.end(i64 4, i8* nonnull %bc1)
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%bc2 = bitcast i8** %alloca2 to i8*
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call void @llvm.lifetime.start(i64 4, i8* %bc2)
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store volatile i8* null, i8** %alloca1
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unreachable
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; CHECK-LABEL: "?catch$2@?0?test2@4HA"
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; CHECK: movq $0, -16(%rbp)
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; CHECK: movq $0, -16(%rbp)
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; CHECK: ud2
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unreachable: ; preds = %entry
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unreachable
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}
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; CHECK-LABEL: $cppxdata$test2:
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; CHECK: .long 0 # CatchObjOffset
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture) #0
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) #0
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attributes #0 = { argmemonly nounwind }
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