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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$" to the name of each instrumented-ABI function. This will not catch every such problem; in particular function pointers passed across the instrumented-native barrier cannot be used on the other side. These problems could potentially be caught dynamically. Differential Revision: http://llvm-reviews.chandlerc.com/D1373 llvm-svn: 189052
24 lines
935 B
LLVM
24 lines
935 B
LLVM
; RUN: opt < %s -dfsan -dfsan-args-abi -dfsan-debug-nonzero-labels -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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declare i32 @g()
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; CHECK: define { i32, i16 } @"dfs$f"(i32, i16)
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define i32 @f(i32) {
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; CHECK: [[LOCALLABELALLOCA:%.*]] = alloca i16
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; CHECK: [[ARGCMP:%.*]] = icmp ne i16 %1, 0
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; CHECK: br i1 [[ARGCMP]]
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%i = alloca i32
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store i32 %0, i32* %i
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; CHECK: [[CALL:%.*]] = call { i32, i16 } @"dfs$g"()
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; CHECK: [[CALLLABEL:%.*]] = extractvalue { i32, i16 } [[CALL]], 1
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; CHECK: [[CALLCMP:%.*]] = icmp ne i16 [[CALLLABEL]], 0
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; CHECK: br i1 [[CALLCMP]]
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%call = call i32 @g()
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; CHECK: [[LOCALLABEL:%.*]] = load i16* [[LOCALLABELALLOCA]]
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; CHECK: [[LOCALCMP:%.*]] = icmp ne i16 [[LOCALLABEL]], 0
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; CHECK: br i1 [[LOCALCMP]]
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%load = load i32* %i
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ret i32 %load
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}
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