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//===-- sanitizer_symbolizer_markup.cpp -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between various sanitizers' runtime libraries.
//
// This generic support for offline symbolizing is based on the
// Fuchsia port. We don't do any actual symbolization per se.
// Instead, we emit text containing raw addresses and raw linkage
// symbol names, embedded in Fuchsia's symbolization markup format.
// See the spec at:
// https://llvm.org/docs/SymbolizerMarkupFormat.html
//===----------------------------------------------------------------------===//
#include "sanitizer_symbolizer_markup.h"
#include "sanitizer_common.h"
#include "sanitizer_symbolizer.h"
#include "sanitizer_symbolizer_markup_constants.h"
namespace __sanitizer {
void MarkupStackTracePrinter::RenderData(InternalScopedString *buffer,
const char *format, const DataInfo *DI,
const char *strip_path_prefix) {
RenderContext(buffer);
buffer->AppendF(kFormatData, DI->start);
}
bool MarkupStackTracePrinter::RenderNeedsSymbolization(const char *format) {
return false;
}
// We don't support the stack_trace_format flag at all.
void MarkupStackTracePrinter::RenderFrame(InternalScopedString *buffer,
const char *format, int frame_no,
uptr address, const AddressInfo *info,
bool vs_style,
const char *strip_path_prefix) {
CHECK(!RenderNeedsSymbolization(format));
RenderContext(buffer);
buffer->AppendF(kFormatFrame, frame_no, address);
}
bool MarkupSymbolizerTool::SymbolizePC(uptr addr, SymbolizedStack *stack) {
char buffer[kFormatFunctionMax];
internal_snprintf(buffer, sizeof(buffer), kFormatFunction, addr);
stack->info.function = internal_strdup(buffer);
return true;
}
bool MarkupSymbolizerTool::SymbolizeData(uptr addr, DataInfo *info) {
info->Clear();
info->start = addr;
return true;
}
const char *MarkupSymbolizerTool::Demangle(const char *name) {
static char buffer[kFormatDemangleMax];
internal_snprintf(buffer, sizeof(buffer), kFormatDemangle, name);
return buffer;
}
// Fuchsia's implementation of symbolizer markup doesn't need to emit contextual
// elements at this point.
// Fuchsia's logging infrastructure emits enough information about
// process memory layout that a post-processing filter can do the
// symbolization and pretty-print the markup.
#if !SANITIZER_FUCHSIA
static bool ModulesEq(const LoadedModule &module,
const RenderedModule &renderedModule) {
return module.base_address() == renderedModule.base_address &&
internal_memcmp(module.uuid(), renderedModule.uuid,
module.uuid_size()) == 0 &&
internal_strcmp(module.full_name(), renderedModule.full_name) == 0;
}
static bool ModuleHasBeenRendered(
const LoadedModule &module,
const InternalMmapVectorNoCtor<RenderedModule> &renderedModules) {
for (const auto &renderedModule : renderedModules)
if (ModulesEq(module, renderedModule))
return true;
return false;
}
static void RenderModule(InternalScopedString *buffer,
const LoadedModule &module, uptr moduleId) {
InternalScopedString buildIdBuffer;
for (uptr i = 0; i < module.uuid_size(); i++)
buildIdBuffer.AppendF("%02x", module.uuid()[i]);
buffer->AppendF(kFormatModule, moduleId, module.full_name(),
buildIdBuffer.data());
buffer->Append("\n");
}
static void RenderMmaps(InternalScopedString *buffer,
const LoadedModule &module, uptr moduleId) {
InternalScopedString accessBuffer;
// All module mmaps are readable at least
for (const auto &range : module.ranges()) {
accessBuffer.Append("r");
if (range.writable)
accessBuffer.Append("w");
if (range.executable)
accessBuffer.Append("x");
//{{{mmap:%starting_addr:%size_in_hex:load:%moduleId:r%(w|x):%relative_addr}}}
// module.base_address == dlpi_addr
// range.beg == dlpi_addr + p_vaddr
// relative address == p_vaddr == range.beg - module.base_address
buffer->AppendF(kFormatMmap, range.beg, range.end - range.beg, moduleId,
accessBuffer.data(), range.beg - module.base_address());
buffer->Append("\n");
accessBuffer.clear();
}
}
void MarkupStackTracePrinter::RenderContext(InternalScopedString *buffer) {
if (renderedModules_.size() == 0)
buffer->Append("{{{reset}}}\n");
const auto &modules = Symbolizer::GetOrInit()->GetRefreshedListOfModules();
for (const auto &module : modules) {
if (ModuleHasBeenRendered(module, renderedModules_))
continue;
// symbolizer markup id, used to refer to this modules from other contextual
// elements
uptr moduleId = renderedModules_.size();
RenderModule(buffer, module, moduleId);
RenderMmaps(buffer, module, moduleId);
renderedModules_.push_back({
internal_strdup(module.full_name()),
module.base_address(),
{},
});
// kModuleUUIDSize is the size of curModule.uuid
CHECK_GE(kModuleUUIDSize, module.uuid_size());
internal_memcpy(renderedModules_.back().uuid, module.uuid(),
module.uuid_size());
}
}
#endif // !SANITIZER_FUCHSIA
} // namespace __sanitizer
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