[PATCH] Standalone LSan initialization. Also includes GET_STACK_TRACE which doesn't belong anywhere else.

[Sergey Matveev]

Hi kcc, glider, samsonov, dvyukov,

See http://llvm-reviews.chandlerc.com/D702 for previous discussion.

http://llvm-reviews.chandlerc.com/D762

Files:
  lib/lsan/lsan.cc
  lib/lsan/lsan.h

Index: lib/lsan/lsan.cc
===================================================================
--- /dev/null
+++ lib/lsan/lsan.cc
@@ -0,0 +1,80 @@
+//=-- lsan.cc -------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of LeakSanitizer.
+// Standalone LSan RTL.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lsan.h"
+
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
+#include "lsan_allocator.h"
+#include "lsan_common.h"
+#include "lsan_thread.h"
+
+namespace __lsan {
+
+void GetStackTrace(StackTrace *stack, uptr max_s, uptr pc, uptr bp, bool fast) {
+  if (!fast)
+    return stack->SlowUnwindStack(pc, max_s);
+  stack->size = 0;
+  stack->trace[0] = pc;
+  if (max_s > 1) {
+    stack->max_size = max_s;
+    ThreadContext *current_context = CurrentThreadContext();
+    if (current_context) {
+      stack->FastUnwindStack(pc, bp,
+                             current_context->stack_end(),
+                             current_context->stack_begin());
+    } else {
+      // Thread not yet inited. Fall back to the slow method.
+      stack->SlowUnwindStack(pc, max_s);
+    }
+  }
+}
+
+static void InitializeCommonFlags() {
+  CommonFlags *cf = common_flags();
+  cf->external_symbolizer_path = GetEnv("LSAN_SYMBOLIZER_PATH");
+  cf->symbolize = (cf->external_symbolizer_path &&
+      cf->external_symbolizer_path[0]);
+  cf->strip_path_prefix = "";
+  cf->fast_unwind_on_malloc = true;
+  cf->malloc_context_size = 30;
+
+  ParseCommonFlagsFromString(GetEnv("LSAN_OPTIONS"));
+}
+
+void Init() {
+  static bool inited;
+  if (inited)
+    return;
+  inited = true;
+  SanitizerToolName = "LeakSanitizer";
+  InitializeCommonFlags();
+  InitializeAllocator();
+  InitCommonLsan();
+  InitTlsSize();
+  InitializeInterceptors();
+  InitializeThreadRegistry();
+  u32 tid = ThreadCreate(0, 0, true);
+  CHECK_EQ(tid, 0);
+  ThreadStart(tid, GetTid());
+
+  // Start symbolizer process if necessary.
+  const char* external_symbolizer = common_flags()->external_symbolizer_path;
+  if (common_flags()->symbolize && external_symbolizer &&
+      external_symbolizer[0]) {
+    InitializeExternalSymbolizer(external_symbolizer);
+  }
+}
+
+}  // namespace __lsan
Index: lib/lsan/lsan.h
===================================================================
--- /dev/null
+++ lib/lsan/lsan.h
@@ -0,0 +1,31 @@
+//=-- lsan.h --------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of LeakSanitizer.
+// Private header for standalone LSan RTL.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
+
+#define GET_STACK_TRACE                                                        \
+  StackTrace stack;                                                            \
+  GetStackTrace(&stack, __sanitizer::common_flags()->malloc_context_size,      \
+                StackTrace::GetCurrentPc(),                                    \
+                GET_CURRENT_FRAME(),                                           \
+                __sanitizer::common_flags()->fast_unwind_on_malloc)
+
+namespace __lsan {
+
+void Init();
+void GetStackTrace(StackTrace *stack, uptr max_s, uptr pc, uptr bp, bool fast);
+void InitializeInterceptors();
+
+}  // namespace __lsan
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