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| author | Peter Collingbourne <peter@pcc.me.uk> | 2013-08-15 18:51:12 +0000 |
|---|---|---|
| committer | Peter Collingbourne <peter@pcc.me.uk> | 2013-08-15 18:51:12 +0000 |
| commit | a77d9f726a7e3c51f04d1d74d091ae1a87d63544 (patch) | |
| tree | 592811f844f575bd90c72a6fbb0affde15bc8a36 /test/Instrumentation | |
| parent | e4272979978951bece0141cdd9f6a4481b34656f (diff) | |
| download | external_llvm-a77d9f726a7e3c51f04d1d74d091ae1a87d63544.zip external_llvm-a77d9f726a7e3c51f04d1d74d091ae1a87d63544.tar.gz external_llvm-a77d9f726a7e3c51f04d1d74d091ae1a87d63544.tar.bz2 | |
DataFlowSanitizer: Add a debugging feature to help us track nonzero labels.
Summary:
When the -dfsan-debug-nonzero-labels parameter is supplied, the code
is instrumented such that when a call parameter, return value or load
produces a nonzero label, the function __dfsan_nonzero_label is called.
The idea is that a debugger breakpoint can be set on this function
in a nominally label-free program to help identify any bugs in the
instrumentation pass causing labels to be introduced.
Reviewers: eugenis
CC: llvm-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D1405
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188472 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Instrumentation')
| -rw-r--r-- | test/Instrumentation/DataFlowSanitizer/debug-nonzero-labels.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/Instrumentation/DataFlowSanitizer/debug-nonzero-labels.ll b/test/Instrumentation/DataFlowSanitizer/debug-nonzero-labels.ll new file mode 100644 index 0000000..4329fd1 --- /dev/null +++ b/test/Instrumentation/DataFlowSanitizer/debug-nonzero-labels.ll @@ -0,0 +1,23 @@ +; RUN: opt < %s -dfsan -dfsan-args-abi -dfsan-debug-nonzero-labels -S | FileCheck %s +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" + +declare i32 @g() + +; CHECK: define { i32, i16 } @f(i32, i16) +define i32 @f(i32) { + ; CHECK: [[LOCALLABELALLOCA:%.*]] = alloca i16 + ; CHECK: [[ARGCMP:%.*]] = icmp ne i16 %1, 0 + ; CHECK: br i1 [[ARGCMP]] + %i = alloca i32 + store i32 %0, i32* %i + ; CHECK: [[CALL:%.*]] = call { i32, i16 } @g() + ; CHECK: [[CALLLABEL:%.*]] = extractvalue { i32, i16 } [[CALL]], 1 + ; CHECK: [[CALLCMP:%.*]] = icmp ne i16 [[CALLLABEL]], 0 + ; CHECK: br i1 [[CALLCMP]] + %call = call i32 @g() + ; CHECK: [[LOCALLABEL:%.*]] = load i16* [[LOCALLABELALLOCA]] + ; CHECK: [[LOCALCMP:%.*]] = icmp ne i16 [[LOCALLABEL]], 0 + ; CHECK: br i1 [[LOCALCMP]] + %load = load i32* %i + ret i32 %load +} |