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[msan] Add __msan_check_mem_is_initialized.

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An assert()-like function that checks that a memory range is fully initialized.

llvm-svn: 205413
This commit is contained in:
Evgeniy Stepanov 2014-04-02 11:50:42 +00:00
parent a55fcd35e9
commit 80cb930c09
3 changed files with 23 additions and 0 deletions
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4
compiler-rt/include/sanitizer/msan_interface.h
View File

@ -54,6 +54,10 @@ extern "C" {
memory range, or -1 if the whole range is good. */
intptr_t __msan_test_shadow(const volatile void *x, size_t size);
/* Checks that memory range is fully initialized, and reports an error if it
* is not. */
void __msan_check_mem_is_initialized(const volatile void *x, size_t size);
/* Set exit code when error(s) were detected.
Value of 0 means don't change the program exit code. */
void __msan_set_exit_code(int exit_code);

16
compiler-rt/lib/msan/msan.cc
View File

@ -383,6 +383,22 @@ sptr __msan_test_shadow(const void *x, uptr size) {
return -1;
}
void __msan_check_mem_is_initialized(const void *x, uptr size) {
if (!__msan::flags()->report_umrs) return;
sptr offset = __msan_test_shadow(x, size) < 0;
if (offset < 0)
return;
GET_CALLER_PC_BP_SP;
(void)sp;
__msan::PrintWarningWithOrigin(pc, bp,
__msan_get_origin(((char *)x) + offset));
if (__msan::flags()->halt_on_error) {
Printf("Exiting\n");
Die();
}
}
int __msan_set_poison_in_malloc(int do_poison) {
int old = flags()->poison_in_malloc;
flags()->poison_in_malloc = do_poison;

3
compiler-rt/lib/msan/msan_interface_internal.h
View File

@ -64,6 +64,9 @@ void __msan_load_unpoisoned(void *src, uptr size, void *dst);
SANITIZER_INTERFACE_ATTRIBUTE
sptr __msan_test_shadow(const void *x, uptr size);
SANITIZER_INTERFACE_ATTRIBUTE
void __msan_check_mem_is_initialized(const void *x, uptr size);
SANITIZER_INTERFACE_ATTRIBUTE
void __msan_set_origin(const void *a, uptr size, u32 origin);
SANITIZER_INTERFACE_ATTRIBUTE