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f1366c5524
DFSan changes the ABI of each function in the module. This makes it possible for a function with the native ABI to be called with the instrumented ABI, or vice versa, thus possibly invoking undefined behavior. A simple way of statically detecting instances of this problem is to prepend the prefix "dfs$" to the name of each instrumented-ABI function. This will not catch every such problem; in particular function pointers passed across the instrumented-native barrier cannot be used on the other side. These problems could potentially be caught dynamically. Differential Revision: http://llvm-reviews.chandlerc.com/D1373 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189052 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
1.5 KiB
LLVM
82 lines
1.5 KiB
LLVM
; RUN: opt < %s -dfsan -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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define i8 @load8(i8* %p) {
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; CHECK: @"dfs$load8"
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; CHECK: ptrtoint
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; CHECK: and
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; CHECK: mul
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; CHECK: inttoptr
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; CHECK: load
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; CHECK: store{{.*}}__dfsan_retval_tls
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; CHECK: ret i8
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%a = load i8* %p
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ret i8 %a
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}
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define i16 @load16(i16* %p) {
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; CHECK: @"dfs$load16"
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; CHECK: ptrtoint
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; CHECK: and
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; CHECK: mul
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; CHECK: inttoptr
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; CHECK: load
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; CHECK: load
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; CHECK: icmp ne
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; CHECK: call{{.*}}__dfsan_union
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; CHECK: store{{.*}}__dfsan_retval_tls
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; CHECK: ret i16
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%a = load i16* %p
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ret i16 %a
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}
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define i32 @load32(i32* %p) {
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; CHECK: @"dfs$load32"
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; CHECK: ptrtoint
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; CHECK: and
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; CHECK: mul
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; CHECK: inttoptr
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; CHECK: bitcast
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; CHECK: load
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; CHECK: trunc
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; CHECK: shl
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; CHECK: lshr
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; CHECK: or
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; CHECK: icmp eq
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; CHECK: store{{.*}}__dfsan_retval_tls
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; CHECK: ret i32
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; CHECK: call{{.*}}__dfsan_union_load
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%a = load i32* %p
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ret i32 %a
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}
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define i64 @load64(i64* %p) {
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; CHECK: @"dfs$load64"
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; CHECK: ptrtoint
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; CHECK: and
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; CHECK: mul
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; CHECK: inttoptr
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; CHECK: bitcast
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; CHECK: load
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; CHECK: trunc
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; CHECK: shl
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; CHECK: lshr
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; CHECK: or
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; CHECK: icmp eq
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; CHECK: store{{.*}}__dfsan_retval_tls
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; CHECK: ret i64
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; CHECK: call{{.*}}__dfsan_union_load
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; CHECK: getelementptr
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; CHECK: load
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; CHECK: icmp eq
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%a = load i64* %p
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ret i64 %a
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}
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