1 files changed, 200 insertions, 0 deletions
diff --git a/libbacktrace/Corkscrew.cpp b/libbacktrace/Corkscrew.cpp
new file mode 100644
index 0000000..8ba1e80
--- /dev/null
+++ b/libbacktrace/Corkscrew.cpp
@@ -0,0 +1,200 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "libbacktrace"
+
+#include <backtrace/backtrace.h>
+
+#include <string.h>
+
+#include <backtrace-arch.h>
+#include <cutils/log.h>
+#include <corkscrew/backtrace.h>
+
+#ifndef __USE_GNU
+#define __USE_GNU
+#endif
+#include <dlfcn.h>
+
+#include "Corkscrew.h"
+
+//-------------------------------------------------------------------------
+// CorkscrewCommon functions.
+//-------------------------------------------------------------------------
+bool CorkscrewCommon::GenerateFrameData(
+    backtrace_frame_t* cork_frames, ssize_t num_frames) {
+  if (num_frames < 0) {
+    ALOGW("CorkscrewCommon::GenerateFrameData: libcorkscrew unwind failed.\n");
+    return false;
+  }
+
+  backtrace_t* data = GetBacktraceData();
+  data->num_frames = num_frames;
+  for (size_t i = 0; i < data->num_frames; i++) {
+    backtrace_frame_data_t* frame = &data->frames[i];
+    frame->pc = cork_frames[i].absolute_pc;
+    frame->sp = cork_frames[i].stack_top;
+    frame->stack_size = cork_frames[i].stack_size;
+    frame->map_name = NULL;
+    frame->map_offset = 0;
+    frame->func_name = NULL;
+    frame->func_offset = 0;
+
+    uintptr_t map_start;
+    frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
+    if (frame->map_name) {
+      frame->map_offset = frame->pc - map_start;
+    }
+
+    std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
+    if (!func_name.empty()) {
+      frame->func_name = strdup(func_name.c_str());
+    }
+  }
+  return true;
+}
+
+//-------------------------------------------------------------------------
+// CorkscrewCurrent functions.
+//-------------------------------------------------------------------------
+CorkscrewCurrent::CorkscrewCurrent() {
+}
+
+CorkscrewCurrent::~CorkscrewCurrent() {
+}
+
+bool CorkscrewCurrent::Unwind(size_t num_ignore_frames) {
+  backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
+  ssize_t num_frames = unwind_backtrace(frames, num_ignore_frames, MAX_BACKTRACE_FRAMES);
+
+  return GenerateFrameData(frames, num_frames);
+}
+
+std::string CorkscrewCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
+  *offset = 0;
+
+  // Get information about the current thread.
+  Dl_info info;
+  const backtrace_map_info_t* map_info = backtrace_obj_->FindMapInfo(pc);
+  const char* symbol_name = NULL;
+  if (map_info && dladdr((const void*)pc, &info) && info.dli_sname) {
+    *offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase;
+    symbol_name = info.dli_sname;
+
+    return symbol_name;
+  }
+  return "";
+}
+
+//-------------------------------------------------------------------------
+// CorkscrewThread functions.
+//-------------------------------------------------------------------------
+CorkscrewThread::CorkscrewThread() {
+}
+
+CorkscrewThread::~CorkscrewThread() {
+  if (corkscrew_map_info_) {
+    free_map_info_list(corkscrew_map_info_);
+    corkscrew_map_info_ = NULL;
+  }
+}
+
+bool CorkscrewThread::Init() {
+  corkscrew_map_info_ = load_map_info_list(backtrace_obj_->Pid());
+  return corkscrew_map_info_ != NULL;
+}
+
+void CorkscrewThread::ThreadUnwind(
+    siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames) {
+  backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
+  ssize_t num_frames = unwind_backtrace_signal_arch(
+      siginfo, sigcontext, corkscrew_map_info_, frames, num_ignore_frames,
+      MAX_BACKTRACE_FRAMES);
+  if (num_frames > 0) {
+    backtrace_t* data = GetBacktraceData();
+    data->num_frames = num_frames;
+    for (size_t i = 0; i < data->num_frames; i++) {
+      backtrace_frame_data_t* frame = &data->frames[i];
+      frame->pc = frames[i].absolute_pc;
+      frame->sp = frames[i].stack_top;
+      frame->stack_size = frames[i].stack_size;
+
+      frame->map_offset = 0;
+      frame->map_name = NULL;
+      frame->map_offset = 0;
+
+      frame->func_offset = 0;
+      frame->func_name = NULL;
+    }
+  }
+}
+
+//-------------------------------------------------------------------------
+// CorkscrewPtrace functions.
+//-------------------------------------------------------------------------
+CorkscrewPtrace::CorkscrewPtrace() : ptrace_context_(NULL) {
+}
+
+CorkscrewPtrace::~CorkscrewPtrace() {
+  if (ptrace_context_) {
+    free_ptrace_context(ptrace_context_);
+    ptrace_context_ = NULL;
+  }
+}
+
+bool CorkscrewPtrace::Unwind(size_t num_ignore_frames) {
+  ptrace_context_ = load_ptrace_context(backtrace_obj_->Tid());
+
+  backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
+  ssize_t num_frames = unwind_backtrace_ptrace(
+      backtrace_obj_->Tid(), ptrace_context_, frames, num_ignore_frames,
+      MAX_BACKTRACE_FRAMES);
+
+  return GenerateFrameData(frames, num_frames);
+}
+
+std::string CorkscrewPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
+  // Get information about a different process.
+  const map_info_t* map_info;
+  const symbol_t* symbol;
+  find_symbol_ptrace(ptrace_context_, pc, &map_info, &symbol);
+  char* symbol_name = NULL;
+  if (symbol) {
+    if (map_info) {
+      *offset = pc - map_info->start - symbol->start;
+    }
+    symbol_name = symbol->name;
+    return symbol_name;
+  }
+
+  return "";
+}
+
+//-------------------------------------------------------------------------
+// C++ object createion functions.
+//-------------------------------------------------------------------------
+Backtrace* CreateCurrentObj() {
+  return new BacktraceCurrent(new CorkscrewCurrent());
+}
+
+Backtrace* CreatePtraceObj(pid_t pid, pid_t tid) {
+  return new BacktracePtrace(new CorkscrewPtrace(), pid, tid);
+}
+
+Backtrace* CreateThreadObj(pid_t tid) {
+  CorkscrewThread* thread_obj = new CorkscrewThread();
+  return new BacktraceThread(thread_obj, thread_obj, tid);
+}