1 files changed, 20 insertions, 3 deletions
diff --git a/include/backtrace/Backtrace.h b/include/backtrace/Backtrace.h
index bd4134c..e07d322 100644
--- a/include/backtrace/Backtrace.h
+++ b/include/backtrace/Backtrace.h
@@ -17,6 +17,7 @@
 #ifndef _BACKTRACE_BACKTRACE_H
 #define _BACKTRACE_BACKTRACE_H
 
+#include <inttypes.h>
 #include <stdint.h>
 
 #include <string>
@@ -25,6 +26,14 @@
 #include <backtrace/backtrace_constants.h>
 #include <backtrace/BacktraceMap.h>
 
+#if __LP64__
+#define PRIPTR "016" PRIxPTR
+typedef uint64_t word_t;
+#else
+#define PRIPTR "08" PRIxPTR
+typedef uint32_t word_t;
+#endif
+
 struct backtrace_frame_data_t {
   size_t num;             // The current fame number.
   uintptr_t pc;           // The absolute pc.
@@ -38,6 +47,14 @@ struct backtrace_frame_data_t {
 // Forward declarations.
 class BacktraceImpl;
 
+#if defined(__APPLE__)
+struct __darwin_ucontext;
+typedef __darwin_ucontext ucontext_t;
+#else
+struct ucontext;
+typedef ucontext ucontext_t;
+#endif
+
 class Backtrace {
 public:
   // Create the correct Backtrace object based on what is to be unwound.
@@ -55,7 +72,7 @@ public:
   virtual ~Backtrace();
 
   // Get the current stack trace and store in the backtrace_ structure.
-  virtual bool Unwind(size_t num_ignore_frames);
+  virtual bool Unwind(size_t num_ignore_frames, ucontext_t* context = NULL);
 
   // Get the function name and offset into the function given the pc.
   // If the string is empty, then no valid function name was found.
@@ -65,7 +82,7 @@ public:
   virtual const backtrace_map_t* FindMap(uintptr_t pc);
 
   // Read the data at a specific address.
-  virtual bool ReadWord(uintptr_t ptr, uint32_t* out_value) = 0;
+  virtual bool ReadWord(uintptr_t ptr, word_t* out_value) = 0;
 
   // Create a string representing the formatted line of backtrace information
   // for a single frame.
@@ -96,7 +113,7 @@ public:
 protected:
   Backtrace(BacktraceImpl* impl, pid_t pid, BacktraceMap* map);
 
-  virtual bool VerifyReadWordArgs(uintptr_t ptr, uint32_t* out_value);
+  virtual bool VerifyReadWordArgs(uintptr_t ptr, word_t* out_value);
 
   bool BuildMap();