Merging r269882:

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r269882 | slthakur | 2016-05-18 11:39:26 +0530 (Wed, 18 May 2016) | 7 lines

[LSAN] Fix test swapcontext.cc on MIPS

There is no frame validity check in the slow unwinder like there is in the fast unwinder due to which lsan reports a leak even for heap allocated coroutine in the test swapcontext.cc. Since mips/linux uses slow unwindwer instead of fast unwinder, the test fails for mips/linux. Therefore adding the checks before unwinding fixes the test for mips/linux.

Reviewed by aizatsky.
Differential: http://reviews.llvm.org/D19961

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git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_38@270672 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 14 insertions, 8 deletions

diff --git a/lib/asan/asan_stack.h b/lib/asan/asan_stack.h
index 5c5181509..cc95e0f30 100644
--- a/lib/asan/asan_stack.h
+++ b/lib/asan/asan_stack.h
@@ -48,7 +48,10 @@ void GetStackTraceWithPcBpAndContext(BufferedStackTrace *stack, uptr max_depth,
       uptr stack_top = t->stack_top();
       uptr stack_bottom = t->stack_bottom();
       ScopedUnwinding unwind_scope(t);
-      stack->Unwind(max_depth, pc, bp, context, stack_top, stack_bottom, fast);
+      if (!SANITIZER_MIPS || IsValidFrame(bp, stack_top, stack_bottom)) {
+        stack->Unwind(max_depth, pc, bp, context, stack_top, stack_bottom,
+                      fast);
+      }
     } else if (!t && !fast) {
       /* If GetCurrentThread() has failed, try to do slow unwind anyways. */
       stack->Unwind(max_depth, pc, bp, context, 0, 0, false);
diff --git a/lib/lsan/lsan.h b/lib/lsan/lsan.h
index 53783cdc9..ec5eb93dc 100644
--- a/lib/lsan/lsan.h
+++ b/lib/lsan/lsan.h
@@ -24,8 +24,11 @@
       stack_top = t->stack_end();                                              \
       stack_bottom = t->stack_begin();                                         \
     }                                                                          \
-    stack.Unwind(max_size, StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(),    \
-                 /* context */ 0, stack_top, stack_bottom, fast);              \
+    if (!SANITIZER_MIPS ||                                                     \
+        IsValidFrame(GET_CURRENT_FRAME(), stack_top, stack_bottom)) {          \
+      stack.Unwind(max_size, StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(),  \
+                   /* context */ 0, stack_top, stack_bottom, fast);            \
+    }                                                                          \
   }
 
 #define GET_STACK_TRACE_FATAL \
diff --git a/lib/sanitizer_common/sanitizer_stacktrace.cc b/lib/sanitizer_common/sanitizer_stacktrace.cc
index 7862575b3..04da55fc9 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ b/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -40,11 +40,6 @@ void BufferedStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
   top_frame_bp = 0;
 }
 
-// Check if given pointer points into allocated stack area.
-static inline bool IsValidFrame(uptr frame, uptr stack_top, uptr stack_bottom) {
-  return frame > stack_bottom && frame < stack_top - 2 * sizeof (uhwptr);
-}
-
 // In GCC on ARM bp points to saved lr, not fp, so we should check the next
 // cell in stack to be a saved frame pointer. GetCanonicFrame returns the
 // pointer to saved frame pointer in any case.
diff --git a/lib/sanitizer_common/sanitizer_stacktrace.h b/lib/sanitizer_common/sanitizer_stacktrace.h
index 969cedb16..90142dffd 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.h
+++ b/lib/sanitizer_common/sanitizer_stacktrace.h
@@ -110,6 +110,11 @@ struct BufferedStackTrace : public StackTrace {
   void operator=(const BufferedStackTrace &);
 };
 
+// Check if given pointer points into allocated stack area.
+static inline bool IsValidFrame(uptr frame, uptr stack_top, uptr stack_bottom) {
+  return frame > stack_bottom && frame < stack_top - 2 * sizeof (uhwptr);
+}
+
 }  // namespace __sanitizer
 
 // Use this macro if you want to print stack trace with the caller