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//===-- sanitizer_symbolizer.cc -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is a stub for LLVM-based symbolizer.
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries. See sanitizer.h for details.
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_procmaps.h"
#include "sanitizer_symbolizer.h"
namespace __sanitizer {
bool IsFullNameOfDWARFSection(const char *full_name, const char *short_name) {
// Skip "__DWARF," prefix.
if (0 == internal_strncmp(full_name, "__DWARF,", 8)) {
full_name += 8;
}
// Skip . and _ prefices.
while (*full_name == '.' || *full_name == '_') {
full_name++;
}
return 0 == internal_strcmp(full_name, short_name);
}
void AddressInfo::Clear() {
InternalFree(module);
InternalFree(function);
InternalFree(file);
internal_memset(this, 0, sizeof(AddressInfo));
}
ModuleDIContext::ModuleDIContext(const char *module_name, uptr base_address) {
full_name_ = internal_strdup(module_name);
short_name_ = internal_strrchr(module_name, '/');
if (short_name_ == 0) {
short_name_ = full_name_;
} else {
short_name_++;
}
base_address_ = base_address;
n_ranges_ = 0;
mapped_addr_ = 0;
mapped_size_ = 0;
}
void ModuleDIContext::addAddressRange(uptr beg, uptr end) {
CHECK_LT(n_ranges_, kMaxNumberOfAddressRanges);
ranges_[n_ranges_].beg = beg;
ranges_[n_ranges_].end = end;
n_ranges_++;
}
bool ModuleDIContext::containsAddress(uptr address) const {
for (uptr i = 0; i < n_ranges_; i++) {
if (ranges_[i].beg <= address && address < ranges_[i].end)
return true;
}
return false;
}
void ModuleDIContext::getAddressInfo(AddressInfo *info) {
info->module = internal_strdup(full_name_);
info->module_offset = info->address - base_address_;
if (mapped_addr_ == 0)
CreateDIContext();
// FIXME: Use the actual debug info context here.
info->function = 0;
info->file = 0;
info->line = 0;
info->column = 0;
}
void ModuleDIContext::CreateDIContext() {
mapped_addr_ = (uptr)MapFileToMemory(full_name_, &mapped_size_);
CHECK(mapped_addr_);
DWARFSection debug_info;
DWARFSection debug_abbrev;
DWARFSection debug_line;
DWARFSection debug_aranges;
DWARFSection debug_str;
FindDWARFSection(mapped_addr_, "debug_info", &debug_info);
FindDWARFSection(mapped_addr_, "debug_abbrev", &debug_abbrev);
FindDWARFSection(mapped_addr_, "debug_line", &debug_line);
FindDWARFSection(mapped_addr_, "debug_aranges", &debug_aranges);
FindDWARFSection(mapped_addr_, "debug_str", &debug_str);
// FIXME: Construct actual debug info context using mapped_addr,
// mapped_size and pointers to DWARF sections in memory.
}
class Symbolizer {
public:
uptr SymbolizeCode(uptr addr, AddressInfo *frames, uptr max_frames) {
if (max_frames == 0)
return 0;
AddressInfo *info = &frames[0];
info->Clear();
info->address = addr;
ModuleDIContext *module = FindModuleForAddress(addr);
if (module) {
module->getAddressInfo(info);
return 1;
}
return 0;
}
private:
ModuleDIContext *FindModuleForAddress(uptr address) {
if (modules_ == 0) {
modules_ = (ModuleDIContext*)InternalAlloc(
kMaxNumberOfModuleContexts * sizeof(ModuleDIContext));
CHECK(modules_);
n_modules_ = GetListOfModules(modules_, kMaxNumberOfModuleContexts);
CHECK_GT(n_modules_, 0);
CHECK_LT(n_modules_, kMaxNumberOfModuleContexts);
}
for (uptr i = 0; i < n_modules_; i++) {
if (modules_[i].containsAddress(address)) {
return &modules_[i];
}
}
return 0;
}
static const uptr kMaxNumberOfModuleContexts = 4096;
// Array of module debug info contexts is leaked.
ModuleDIContext *modules_;
uptr n_modules_;
};
static Symbolizer symbolizer; // Linker initialized.
uptr SymbolizeCode(uptr address, AddressInfo *frames, uptr max_frames) {
return symbolizer.SymbolizeCode(address, frames, max_frames);
}
} // namespace __sanitizer
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