Author: kcc Date: Sat Sep 17 00:03:05 2016 New Revision: 281809 URL: http://llvm.org/viewvc/llvm-project?rev=281809&view=rev Log: [sanitizer-coverage] change trace-pc to use 8-byte guards
Modified: cfe/trunk/docs/SanitizerCoverage.rst Modified: cfe/trunk/docs/SanitizerCoverage.rst URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/SanitizerCoverage.rst?rev=281809&r1=281808&r2=281809&view=diff ============================================================================== --- cfe/trunk/docs/SanitizerCoverage.rst (original) +++ cfe/trunk/docs/SanitizerCoverage.rst Sat Sep 17 00:03:05 2016 @@ -331,24 +331,23 @@ on every edge: .. code-block:: none - if (guard_variable != 0xff) + if (guard_variable >= 0) __sanitizer_cov_trace_pc_guard(&guard_variable) -Every edge will have its own 1-byte `guard_variable`. -All such guard variables will reside in a dedicated section -(i.e. they essentially form an array). - -Similarly to `trace-pc,indirect-calls`, with `trace-pc-guards,indirect-calls` -``__sanitizer_cov_trace_pc_indirect(void *callee)`` will be inserted on every indirect call. +Every edge will have its own 8-byte `guard_variable`. The compler will also insert a module constructor that will call .. code-block:: c++ - // The guard section is the address range [start, stop). - __sanitizer_cov_trace_pc_guard_init(void *start, void *stop); + // The guards are [start, stop). + // This function may be called multiple times with the same values of start/stop. + __sanitizer_cov_trace_pc_guard_init(uint64_t *start, uint64_t *stop); + +Similarly to `trace-pc,indirect-calls`, with `trace-pc-guards,indirect-calls` +``__sanitizer_cov_trace_pc_indirect(void *callee)`` will be inserted on every indirect call. -The functions `__sanitizer_cov_trace_pc_guard[_init]` should be defined by the user. +The functions `__sanitizer_cov_trace_pc_*` should be defined by the user. Tracing data flow ================= _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits