[compiler-rt] r210267 - [asancov] Faster coverage in memory-mapped mode.
Evgeniy Stepanov
eugeni.stepanov at gmail.com
Thu Jun 5 07:38:53 PDT 2014
Author: eugenis
Date: Thu Jun 5 09:38:53 2014
New Revision: 210267
URL: http://llvm.org/viewvc/llvm-project?rev=210267&view=rev
Log:
[asancov] Faster coverage in memory-mapped mode.
Use caller pc of __sanitizer_cov_module_init to figure out
when 2 sequential calls are from the same module; skip
.sancov.map file update in this case.
Modified:
compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_libcdep.cc
compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h?rev=210267&r1=210266&r2=210267&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h Thu Jun 5 09:38:53 2014
@@ -192,7 +192,7 @@ void PrepareForSandboxing(__sanitizer_sa
void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args);
void SetSandboxingCallback(void (*f)());
-void CovUpdateMapping();
+void CovUpdateMapping(uptr caller_pc = 0);
void CovBeforeFork();
void CovAfterFork(int child_pid);
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_libcdep.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_libcdep.cc?rev=210267&r1=210266&r2=210267&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_libcdep.cc (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_libcdep.cc Thu Jun 5 09:38:53 2014
@@ -174,12 +174,6 @@ void CoverageData::Extend(uptr npcs) {
}
atomic_store(&pc_array_size, size, memory_order_release);
-
- if (SANITIZER_ANDROID) {
- // dlopen/dlclose interceptors do not work on Android, so we rely on
- // Extend() calls to update .sancov.map.
- CovUpdateMapping();
- }
}
// Simply add the pc into the vector under lock. If the function is called more
@@ -371,6 +365,12 @@ SANITIZER_INTERFACE_ATTRIBUTE void __san
coverage_data.Init();
}
SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_module_init(uptr npcs) {
+ if (SANITIZER_ANDROID && common_flags()->coverage &&
+ common_flags()->coverage_direct) {
+ // dlopen/dlclose interceptors do not work on Android, so we rely on
+ // Extend() calls to update .sancov.map.
+ CovUpdateMapping(GET_CALLER_PC());
+ }
coverage_data.Extend(npcs);
}
SANITIZER_INTERFACE_ATTRIBUTE
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc?rev=210267&r1=210266&r2=210267&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc Thu Jun 5 09:38:53 2014
@@ -40,30 +40,36 @@ static const uptr kMaxTextSize = 64 * 10
struct CachedMapping {
public:
- bool TestAndUpdate(const char *new_mapping) {
+ bool NeedsUpdate(uptr pc) {
int new_pid = internal_getpid();
- if (last_mapping && last_pid == new_pid &&
- internal_strcmp(last_mapping, new_mapping) == 0)
+ if (last_pid == new_pid && pc && pc >= last_range_start &&
+ pc < last_range_end)
return false;
- if (!last_mapping) last_mapping = (char *)InternalAlloc(kMaxTextSize);
last_pid = new_pid;
- internal_strncpy(last_mapping, new_mapping, kMaxTextSize);
return true;
}
+ void SetModuleRange(uptr start, uptr end) {
+ last_range_start = start;
+ last_range_end = end;
+ }
+
private:
- char *last_mapping;
+ uptr last_range_start, last_range_end;
int last_pid;
};
static CachedMapping cached_mapping;
static StaticSpinMutex mapping_mu;
-void CovUpdateMapping() {
+void CovUpdateMapping(uptr caller_pc) {
if (!common_flags()->coverage || !common_flags()->coverage_direct) return;
SpinMutexLock l(&mapping_mu);
+ if (!cached_mapping.NeedsUpdate(caller_pc))
+ return;
+
InternalScopedString text(kMaxTextSize);
InternalScopedBuffer<char> modules_data(kMaxNumberOfModules *
sizeof(LoadedModule));
@@ -76,17 +82,16 @@ void CovUpdateMapping() {
for (int i = 0; i < n_modules; ++i) {
char *module_name = StripModuleName(modules[i].full_name());
for (unsigned j = 0; j < modules[i].n_ranges(); ++j) {
- text.append("%zx %zx %zx %s\n", modules[i].address_range_start(j),
- modules[i].address_range_end(j), modules[i].base_address(),
- module_name);
+ uptr start = modules[i].address_range_start(j);
+ uptr end = modules[i].address_range_end(j);
+ uptr base = modules[i].base_address();
+ text.append("%zx %zx %zx %s\n", start, end, base, module_name);
+ if (caller_pc && caller_pc >= start && caller_pc < end)
+ cached_mapping.SetModuleRange(start, end);
}
InternalFree(module_name);
}
- // Do not write mapping if it is the same as the one we've wrote last time.
- if (!cached_mapping.TestAndUpdate(text.data()))
- return;
-
int err;
InternalScopedString tmp_path(64 +
internal_strlen(common_flags()->coverage_dir));
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