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06fe9815da
This adds support for TSan C++ exception handling, where we need to add extra calls to __tsan_func_exit when a function is exitted via exception mechanisms. Otherwise the shadow stack gets corrupted (leaked). This patch moves and enhances the existing implementation of EscapeEnumerator that finds all possible function exit points, and adds extra EH cleanup blocks where needed. Differential Revision: https://reviews.llvm.org/D26177 llvm-svn: 286893
37 lines
1.0 KiB
LLVM
37 lines
1.0 KiB
LLVM
; RUN: opt < %s -tsan -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-unknown-linux-gnu"
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; no sanitize_thread attribute here
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define i32 @read_4_bytes(i32* %a) {
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entry:
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%tmp1 = load i32, i32* %a, align 4
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ret i32 %tmp1
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}
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; CHECK: define i32 @read_4_bytes(i32* %a) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %tmp1 = load i32, i32* %a, align 4
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; CHECK: ret i32 %tmp1
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; no sanitize_thread attribute here
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define i32 @read_4_bytes_and_call(i32* %a) {
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entry:
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call void @foo()
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%tmp1 = load i32, i32* %a, align 4
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ret i32 %tmp1
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}
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; CHECK: define i32 @read_4_bytes_and_call(i32* %a) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %0 = call i8* @llvm.returnaddress(i32 0)
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; CHECK-NEXT: call void @__tsan_func_entry(i8* %0)
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: %tmp1 = load i32, i32* %a, align 4
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; CHECK-NEXT: call void @__tsan_func_exit()
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; CHECK-NEXT: ret i32 %tmp1
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declare void @foo() nounwind
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