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[sancov] pc_guard_init is called at least once per DSO.

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Summary: Documentation update for https://reviews.llvm.org/D29662

Differential Revision: https://reviews.llvm.org/D29722

llvm-svn: 294522
This commit is contained in:
Mike Aizatsky 2017-02-08 21:28:39 +00:00
parent a14fbe0cf3
commit 9afa12bbc5
1 changed files with 5 additions and 4 deletions
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9
clang/docs/SanitizerCoverage.rst
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@ -355,7 +355,8 @@ The compler will also insert a module constructor that will call
.. code-block:: c++
// The guards are [start, stop).
// This function may be called multiple times with the same values of start/stop.
// This function will be called at least once per DSO and may be called
// more than once with the same values of start/stop.
__sanitizer_cov_trace_pc_guard_init(uint32_t *start, uint32_t *stop);
With `trace-pc-guards,indirect-calls`
@ -373,10 +374,10 @@ Example:
#include <sanitizer/coverage_interface.h>
// This callback is inserted by the compiler as a module constructor
// into every compilation unit. 'start' and 'stop' correspond to the
// into every DSO. 'start' and 'stop' correspond to the
// beginning and end of the section with the guards for the entire
// binary (executable or DSO) and so it will be called multiple times
// with the same parameters.
// binary (executable or DSO). The callback will be called at least
// once per DSO and may be called multiple times with the same parameters.
extern "C" void __sanitizer_cov_trace_pc_guard_init(uint32_t *start,
uint32_t *stop) {
static uint64_t N; // Counter for the guards.