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[msan] Add store_context_size= flag. 

A new flag to control stack trace size for store event (in
track-origins=2 mode) independently of malloc_context_size.

llvm-svn: 211896
This commit is contained in:
Evgeniy Stepanov 2014-06-27 12:48:01 +00:00
parent c237a1a2e3
commit c935ca8c3c
4 changed files with 12 additions and 7 deletions
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3
compiler-rt/lib/msan/msan.cc
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@ -145,6 +145,8 @@ static void ParseFlagsFromString(Flags *f, const char *str) {
ParseFlag(str, &f->wrap_signals, "wrap_signals", "");
ParseFlag(str, &f->print_stats, "print_stats", "");
ParseFlag(str, &f->atexit, "atexit", "");
ParseFlag(str, &f->store_context_size, "store_context_size", "");
if (f->store_context_size < 1) f->store_context_size = 1;
// keep_going is an old name for halt_on_error,
// and it has inverse meaning.
@ -177,6 +179,7 @@ static void InitializeFlags(Flags *f, const char *options) {
f->print_stats = false;
f->atexit = false;
f->halt_on_error = !&__msan_keep_going;
f->store_context_size = 20;
// Override from user-specified string.
if (__msan_default_options)

2
compiler-rt/lib/msan/msan.h
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@ -108,7 +108,7 @@ u32 ChainOrigin(u32 id, StackTrace *stack);
StackTrace stack; \
stack.size = 0; \
if (__msan_get_track_origins() > 1 && msan_inited) \
GetStackTrace(&stack, common_flags()->malloc_context_size, pc, bp, \
GetStackTrace(&stack, flags()->store_context_size, pc, bp, \
common_flags()->fast_unwind_on_malloc)
#define GET_FATAL_STACK_TRACE_PC_BP(pc, bp) \

1
compiler-rt/lib/msan/msan_flags.h
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@ -30,6 +30,7 @@ struct Flags {
bool print_stats;
bool halt_on_error;
bool atexit;
int store_context_size; // like malloc_context_size, but for uninit stores
};
Flags *flags();

3
compiler-rt/test/msan/chained_origin_empty_stack.cc
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@ -1,5 +1,5 @@
// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t && \
// RUN: MSAN_OPTIONS=malloc_context_size=1 not %run %t 2>&1 | FileCheck %s
// RUN: MSAN_OPTIONS=store_context_size=1 not %run %t 2>&1 | FileCheck %s
// Test that stack trace for the intermediate store is not empty.
@ -8,6 +8,7 @@
// CHECK: Uninitialized value was stored to memory at
// CHECK: #0 {{.*}} in fn_g
// CHECK-NOT: #1
// CHECK: Uninitialized value was created by an allocation of 'z' in the stack frame of function 'main'
// CHECK: #0 {{.*}} in main