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ac1c1c4377
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$" to the name of each instrumented-ABI function. This will not catch every such problem; in particular function pointers passed across the instrumented-native barrier cannot be used on the other side. These problems could potentially be caught dynamically. Differential Revision: http://llvm-reviews.chandlerc.com/D1373 llvm-svn: 189052
48 lines
1.4 KiB
LLVM
48 lines
1.4 KiB
LLVM
; RUN: opt < %s -dfsan -dfsan-args-abi -dfsan-abilist=%S/Inputs/abilist.txt -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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; CHECK: i32 @discard(i32 %a, i32 %b)
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define i32 @discard(i32 %a, i32 %b) {
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ret i32 0
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}
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; CHECK: i32 @functional(i32 %a, i32 %b)
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define i32 @functional(i32 %a, i32 %b) {
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%c = add i32 %a, %b
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ret i32 %c
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}
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declare void @custom1(i32 %a, i32 %b)
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declare i32 @custom2(i32 %a, i32 %b)
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; CHECK: @"dfs$f"
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define void @f() {
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; CHECK: %[[LABELRETURN:.*]] = alloca i16
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; CHECK: call void @__dfsw_custom1(i32 1, i32 2, i16 0, i16 0)
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call void @custom1(i32 1, i32 2)
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; CHECK: call i32 @__dfsw_custom2(i32 1, i32 2, i16 0, i16 0, i16* %[[LABELRETURN]])
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call i32 @custom2(i32 1, i32 2)
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ret void
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}
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; CHECK: define linkonce_odr { i32, i16 } @"dfsw$custom2"(i32, i32, i16, i16)
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; CHECK: %[[LABELRETURN2:.*]] = alloca i16
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; CHECK: %[[RV:.*]] = call i32 @__dfsw_custom2
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; CHECK: %[[RVSHADOW:.*]] = load i16* %[[LABELRETURN2]]
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; CHECK: insertvalue {{.*}}[[RV]], 0
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; CHECK: insertvalue {{.*}}[[RVSHADOW]], 1
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; CHECK: ret { i32, i16 }
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; CHECK: @"dfs$g"
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define i32 (i32, i32)* @g() {
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; CHECK: ret {{.*}} @"dfsw$custom2"
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ret i32 (i32, i32)* @custom2
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}
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; CHECK: declare void @__dfsw_custom1(i32, i32, i16, i16)
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; CHECK: declare i32 @__dfsw_custom2(i32, i32, i16, i16, i16*)
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