[compiler-rt] r231361 - Symbolizer refactoring: Link symbolizer tools into a fallback chain
Kuba Brecka
kuba.brecka at gmail.com
Thu Mar 5 01:47:13 PST 2015
Author: kuba.brecka
Date: Thu Mar 5 03:47:13 2015
New Revision: 231361
URL: http://llvm.org/viewvc/llvm-project?rev=231361&view=rev
Log:
Symbolizer refactoring: Link symbolizer tools into a fallback chain
Reviewed at http://reviews.llvm.org/D8049
Modified:
compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_internal.h
compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_internal.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_internal.h?rev=231361&r1=231360&r2=231361&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_internal.h (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_internal.h Thu Mar 5 03:47:13 2015
@@ -28,6 +28,13 @@ const char *ExtractUptr(const char *str,
class SymbolizerTool {
public:
+ // POSIXSymbolizer implements a "fallback chain" of symbolizer tools. In a
+ // request to symbolize an address, if one tool returns false, the next tool
+ // in the chain will be tried.
+ SymbolizerTool *next;
+
+ SymbolizerTool() : next(nullptr) { }
+
// Can't declare pure virtual functions in sanitizer runtimes:
// __cxa_pure_virtual might be unavailable.
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc?rev=231361&r1=231360&r2=231361&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc Thu Mar 5 03:47:13 2015
@@ -350,8 +350,8 @@ class InternalSymbolizer : public Symbol
class POSIXSymbolizer : public Symbolizer {
public:
- explicit POSIXSymbolizer(SymbolizerTool *symbolizer_tool)
- : Symbolizer(), symbolizer_tool_(symbolizer_tool) {}
+ explicit POSIXSymbolizer(IntrusiveList<SymbolizerTool> tools)
+ : Symbolizer(), tools_(tools) {}
SymbolizedStack *SymbolizePC(uptr addr) override {
BlockingMutexLock l(&mu_);
@@ -362,9 +362,12 @@ class POSIXSymbolizer : public Symbolize
return res;
// Always fill data about module name and offset.
res->info.FillModuleInfo(module_name, module_offset);
- if (symbolizer_tool_) {
+ for (auto iter = Iterator(&tools_); iter.hasNext();) {
+ auto *tool = iter.next();
SymbolizerScope sym_scope(this);
- symbolizer_tool_->SymbolizePC(addr, res);
+ if (tool->SymbolizePC(addr, res)) {
+ return res;
+ }
}
return res;
}
@@ -379,9 +382,12 @@ class POSIXSymbolizer : public Symbolize
info->Clear();
info->module = internal_strdup(module_name);
info->module_offset = module_offset;
- if (symbolizer_tool_) {
+ for (auto iter = Iterator(&tools_); iter.hasNext();) {
+ auto *tool = iter.next();
SymbolizerScope sym_scope(this);
- symbolizer_tool_->SymbolizeData(addr, info);
+ if (tool->SymbolizeData(addr, info)) {
+ return true;
+ }
}
return true;
}
@@ -393,22 +399,24 @@ class POSIXSymbolizer : public Symbolize
}
bool CanReturnFileLineInfo() override {
- return symbolizer_tool_ != nullptr;
+ return !tools_.empty();
}
void Flush() override {
BlockingMutexLock l(&mu_);
- if (symbolizer_tool_) {
+ for (auto iter = Iterator(&tools_); iter.hasNext();) {
+ auto *tool = iter.next();
SymbolizerScope sym_scope(this);
- symbolizer_tool_->Flush();
+ tool->Flush();
}
}
const char *Demangle(const char *name) override {
BlockingMutexLock l(&mu_);
- if (symbolizer_tool_) {
+ for (auto iter = Iterator(&tools_); iter.hasNext();) {
+ auto *tool = iter.next();
SymbolizerScope sym_scope(this);
- if (const char *demangled = symbolizer_tool_->Demangle(name))
+ if (const char *demangled = tool->Demangle(name))
return demangled;
}
return DemangleCXXABI(name);
@@ -472,7 +480,8 @@ class POSIXSymbolizer : public Symbolize
bool modules_fresh_;
BlockingMutex mu_;
- SymbolizerTool *const symbolizer_tool_; // Leaked.
+ typedef IntrusiveList<SymbolizerTool>::Iterator Iterator;
+ IntrusiveList<SymbolizerTool> tools_;
};
static SymbolizerTool *ChooseSymbolizer(LowLevelAllocator *allocator) {
@@ -507,8 +516,12 @@ static SymbolizerTool *ChooseSymbolizer(
}
Symbolizer *Symbolizer::PlatformInit() {
- return new(symbolizer_allocator_)
- POSIXSymbolizer(ChooseSymbolizer(&symbolizer_allocator_));
+ IntrusiveList<SymbolizerTool> list;
+ list.clear();
+ if (SymbolizerTool *tool = ChooseSymbolizer(&symbolizer_allocator_)) {
+ list.push_back(tool);
+ }
+ return new(symbolizer_allocator_) POSIXSymbolizer(list);
}
} // namespace __sanitizer
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