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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$" to the name of each instrumented-ABI function. This will not catch every such problem; in particular function pointers passed across the instrumented-native barrier cannot be used on the other side. These problems could potentially be caught dynamically. Differential Revision: http://llvm-reviews.chandlerc.com/D1373 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189052 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
766 B
LLVM
24 lines
766 B
LLVM
; RUN: opt < %s -dfsan -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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; CHECK: @__dfsan_arg_tls = external thread_local(initialexec) global [64 x i16]
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; CHECK: @__dfsan_retval_tls = external thread_local(initialexec) global i16
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declare i32 @f(i32)
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declare float @llvm.sqrt.f32(float)
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; CHECK: @"dfs$call"
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define i32 @call() {
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; CHECK: store{{.*}}__dfsan_arg_tls
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; CHECK: call{{.*}}@"dfs$f"
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; CHECK: load{{.*}}__dfsan_retval_tls
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%r = call i32 @f(i32 0)
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; CHECK-NOT: store{{.*}}__dfsan_arg_tls
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%i = call float @llvm.sqrt.f32(float -1.0)
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; CHECK: store{{.*}}__dfsan_retval_tls
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; CHECK: ret i32
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ret i32 %r
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}
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