144 lines
5.3 KiB
C++
144 lines
5.3 KiB
C++
//===-- sanitizer_symbolizer_markup.cc ------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between various sanitizers' runtime libraries.
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//
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// Implementation of offline markup symbolizer.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_SYMBOLIZER_MARKUP
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#if SANITIZER_FUCHSIA
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#include "sanitizer_symbolizer_fuchsia.h"
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#elif SANITIZER_RTEMS
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#include "sanitizer_symbolizer_rtems.h"
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#endif
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#include "sanitizer_stacktrace.h"
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#include "sanitizer_symbolizer.h"
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#include <limits.h>
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#include <unwind.h>
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namespace __sanitizer {
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// This generic support for offline symbolizing is based on the
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// Fuchsia port. We don't do any actual symbolization per se.
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// Instead, we emit text containing raw addresses and raw linkage
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// symbol names, embedded in Fuchsia's symbolization markup format.
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// Fuchsia's logging infrastructure emits enough information about
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// process memory layout that a post-processing filter can do the
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// symbolization and pretty-print the markup. See the spec at:
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// https://fuchsia.googlesource.com/zircon/+/master/docs/symbolizer_markup.md
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// This is used by UBSan for type names, and by ASan for global variable names.
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// It's expected to return a static buffer that will be reused on each call.
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const char *Symbolizer::Demangle(const char *name) {
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static char buffer[kFormatDemangleMax];
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internal_snprintf(buffer, sizeof(buffer), kFormatDemangle, name);
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return buffer;
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}
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// This is used mostly for suppression matching. Making it work
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// would enable "interceptor_via_lib" suppressions. It's also used
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// once in UBSan to say "in module ..." in a message that also
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// includes an address in the module, so post-processing can already
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// pretty-print that so as to indicate the module.
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bool Symbolizer::GetModuleNameAndOffsetForPC(uptr pc, const char **module_name,
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uptr *module_address) {
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return false;
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}
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// This is used in some places for suppression checking, which we
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// don't really support for Fuchsia. It's also used in UBSan to
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// identify a PC location to a function name, so we always fill in
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// the function member with a string containing markup around the PC
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// value.
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// TODO(mcgrathr): Under SANITIZER_GO, it's currently used by TSan
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// to render stack frames, but that should be changed to use
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// RenderStackFrame.
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SymbolizedStack *Symbolizer::SymbolizePC(uptr addr) {
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SymbolizedStack *s = SymbolizedStack::New(addr);
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char buffer[kFormatFunctionMax];
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internal_snprintf(buffer, sizeof(buffer), kFormatFunction, addr);
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s->info.function = internal_strdup(buffer);
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return s;
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}
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// Always claim we succeeded, so that RenderDataInfo will be called.
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bool Symbolizer::SymbolizeData(uptr addr, DataInfo *info) {
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info->Clear();
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info->start = addr;
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return true;
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}
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// We ignore the format argument to __sanitizer_symbolize_global.
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void RenderData(InternalScopedString *buffer, const char *format,
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const DataInfo *DI, const char *strip_path_prefix) {
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buffer->append(kFormatData, DI->start);
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}
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// We don't support the stack_trace_format flag at all.
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void RenderFrame(InternalScopedString *buffer, const char *format, int frame_no,
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const AddressInfo &info, bool vs_style,
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const char *strip_path_prefix, const char *strip_func_prefix) {
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buffer->append(kFormatFrame, frame_no, info.address);
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}
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Symbolizer *Symbolizer::PlatformInit() {
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return new (symbolizer_allocator_) Symbolizer({});
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}
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void Symbolizer::LateInitialize() { Symbolizer::GetOrInit(); }
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void StartReportDeadlySignal() {}
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void ReportDeadlySignal(const SignalContext &sig, u32 tid,
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UnwindSignalStackCallbackType unwind,
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const void *unwind_context) {}
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#if SANITIZER_CAN_SLOW_UNWIND
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struct UnwindTraceArg {
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BufferedStackTrace *stack;
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u32 max_depth;
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};
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_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
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UnwindTraceArg *arg = static_cast<UnwindTraceArg *>(param);
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CHECK_LT(arg->stack->size, arg->max_depth);
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uptr pc = _Unwind_GetIP(ctx);
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if (pc < PAGE_SIZE) return _URC_NORMAL_STOP;
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arg->stack->trace_buffer[arg->stack->size++] = pc;
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return (arg->stack->size == arg->max_depth ? _URC_NORMAL_STOP
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: _URC_NO_REASON);
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}
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void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
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CHECK_GE(max_depth, 2);
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size = 0;
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UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
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_Unwind_Backtrace(Unwind_Trace, &arg);
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CHECK_GT(size, 0);
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// We need to pop a few frames so that pc is on top.
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uptr to_pop = LocatePcInTrace(pc);
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// trace_buffer[0] belongs to the current function so we always pop it,
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// unless there is only 1 frame in the stack trace (1 frame is always better
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// than 0!).
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PopStackFrames(Min(to_pop, static_cast<uptr>(1)));
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trace_buffer[0] = pc;
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}
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void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
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u32 max_depth) {
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CHECK_NE(context, nullptr);
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UNREACHABLE("signal context doesn't exist");
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}
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#endif // SANITIZER_CAN_SLOW_UNWIND
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} // namespace __sanitizer
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#endif // SANITIZER_SYMBOLIZER_MARKUP
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