1 files changed, 67 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp b/contrib/llvm-project/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp
new file mode 100644
index 000000000000..ea8e72be287d
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp
@@ -0,0 +1,67 @@
+//===-- backtrace_linux_libc.cpp --------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <assert.h>
+#include <execinfo.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "gwp_asan/definitions.h"
+#include "gwp_asan/optional/backtrace.h"
+#include "gwp_asan/optional/printf.h"
+#include "gwp_asan/options.h"
+
+namespace {
+size_t Backtrace(uintptr_t *TraceBuffer, size_t Size) {
+  static_assert(sizeof(uintptr_t) == sizeof(void *), "uintptr_t is not void*");
+
+  return backtrace(reinterpret_cast<void **>(TraceBuffer), Size);
+}
+
+// We don't need any custom handling for the Segv backtrace - the libc unwinder
+// has no problems with unwinding through a signal handler. Force inlining here
+// to avoid the additional frame.
+GWP_ASAN_ALWAYS_INLINE size_t SegvBacktrace(uintptr_t *TraceBuffer, size_t Size,
+                                            void * /*Context*/) {
+  return Backtrace(TraceBuffer, Size);
+}
+
+static void PrintBacktrace(uintptr_t *Trace, size_t TraceLength,
+                           gwp_asan::Printf_t Printf) {
+  if (TraceLength == 0) {
+    Printf("  <not found (does your allocator support backtracing?)>\n\n");
+    return;
+  }
+
+  char **BacktraceSymbols =
+      backtrace_symbols(reinterpret_cast<void **>(Trace), TraceLength);
+
+  for (size_t i = 0; i < TraceLength; ++i) {
+    if (!BacktraceSymbols)
+      Printf("  #%zu %p\n", i, Trace[i]);
+    else
+      Printf("  #%zu %s\n", i, BacktraceSymbols[i]);
+  }
+
+  Printf("\n");
+  if (BacktraceSymbols)
+    free(BacktraceSymbols);
+}
+} // anonymous namespace
+
+namespace gwp_asan {
+namespace backtrace {
+
+options::Backtrace_t getBacktraceFunction() { return Backtrace; }
+PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; }
+SegvBacktrace_t getSegvBacktraceFunction() { return SegvBacktrace; }
+
+} // namespace backtrace
+} // namespace gwp_asan