1 files changed, 75 insertions, 0 deletions
diff --git a/stacktrace.c b/stacktrace.c
new file mode 100644
index 0000000..1e79bfa
--- /dev/null
+++ b/stacktrace.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <unwind.h>
+#include <sys/types.h>
+
+// =============================================================================
+// stack trace functions
+// =============================================================================
+
+typedef struct
+{
+    size_t count;
+    intptr_t* addrs;
+} stack_crawl_state_t;
+
+
+/* depends how the system includes define this */
+#ifdef HAVE_UNWIND_CONTEXT_STRUCT
+typedef struct _Unwind_Context __unwind_context;
+#else
+typedef _Unwind_Context __unwind_context;
+#endif
+
+static _Unwind_Reason_Code trace_function(__unwind_context *context, void *arg)
+{
+    stack_crawl_state_t* state = (stack_crawl_state_t*)arg;
+    if (state->count) {
+        intptr_t ip = (intptr_t)_Unwind_GetIP(context);
+        if (ip) {
+            state->addrs[0] = ip;
+            state->addrs++;
+            state->count--;
+            return _URC_NO_REASON;
+        }
+    }
+    /*
+     * If we run out of space to record the address or 0 has been seen, stop
+     * unwinding the stack.
+     */
+    return _URC_END_OF_STACK;
+}
+
+int heaptracker_stacktrace(intptr_t* addrs, size_t max_entries)
+{
+    stack_crawl_state_t state;
+    state.count = max_entries;
+    state.addrs = (intptr_t*)addrs;
+    _Unwind_Backtrace(trace_function, (void*)&state);
+    return max_entries - state.count;
+}