// StackTrace.cpp

// Implements the functions to print current stack traces

#include "Globals.h"
#include "StackTrace.h"
#ifdef _WIN32
	#include "../StackWalker.h"
#else
	#ifdef __GLIBC__
		#include <execinfo.h>
	#endif
	#include <unistd.h>
#endif

// FreeBSD uses size_t for the return type of backtrace()
#if defined(__FreeBSD__) && (__FreeBSD__ >= 10)
	#define btsize size_t
#else
	#define btsize int
#endif





void PrintStackTrace(void)
{
	#ifdef _WIN32
		// Reuse the StackWalker from the LeakFinder project already bound to MCS
		// Define a subclass of the StackWalker that outputs everything to stdout
		class PrintingStackWalker :
			public StackWalker
		{
			virtual void OnOutput(LPCSTR szText) override
			{
				puts(szText);
			}
		} sw;
		sw.ShowCallstack();
	#else
		#ifdef __GLIBC__
			// Use the backtrace() function to get and output the stackTrace:
			// Code adapted from http://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes
			void * stackTrace[30];
			btsize numItems = backtrace(stackTrace, ARRAYCOUNT(stackTrace));
			backtrace_symbols_fd(stackTrace, numItems, STDERR_FILENO);
		#endif
	#endif
}