Merge lp:~trond-norbye/pandora-build/printstack into lp:pandora-build

[Trond Norbye]

[Trond Norbye (trond-norbye)]

Added a "function" to the output header to dump the callstack to a stream by either printstack on the systems that support that, or by the backtrace function from execinfo.h if that's available. If none of the methods is supported it just prints out a notification telling so..

the signature of the "function" would be:

void pandora_print_callstack(FILE *stream)

Unmerged revisions

82. By Trond Norbye on 2009-12-06

Added pandora_print_callstack()

=== added file 'm4/pandora_print_callstack.m4'
--- m4/pandora_print_callstack.m4	1970-01-01 00:00:00 +0000
+++ m4/pandora_print_callstack.m4	2009-12-06 10:10:23 +0000
@@ -0,0 +1,59 @@
+dnl  Copyright (C) 2009 Sun Microsystems
+dnl This file is free software; Sun Microsystems
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Try to define a macro to dump the current callstack.
+AC_DEFUN([PANDORA_PRINT_CALLSTACK],[
+  AC_CHECK_HEADERS([ucontext.h])
+  AS_IF([test "x$ac_cv_header_ucontext_h" = "xyes"],
+  	[ AC_CHECK_FUNCS([printstack]) ])
+
+  AS_IF([ test "x$ac_cv_func_printstack" != "xyes"],
+        [ AC_CHECK_HEADERS([dlfcn.h])
+          AC_CHECK_HEADERS([execinfo.h])
+          AC_CHECK_FUNCS([backtrace])
+          AC_CHECK_FUNCS([backtrace_symbols_fd]) ])
+
+  AH_BOTTOM([
+#ifdef __cplusplus
+#include <cstdio>
+#define PANDORA_PRINTSTACK_STD_PREFIX std::
+#else
+#include <stdio.h>
+#define PANDORA_PRINTSTACK_STD_PREFIX
+#endif
+
+#if defined(HAVE_UCONTEXT_H) && defined(HAVE_PRINTSTACK)
+#include <ucontext.h>
+#define pandora_print_callstack(a) \
+printstack(PANDORA_PRINTSTACK_STD_PREFIX fileno(a))
+#elif defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE) && defined(HAVE_BACKTRACE_SYMBOLS_FD)
+
+#include <execinfo.h>
+
+#define pandora_print_callstack(a) \
+{ \
+  void *stack[100];  \
+  int depth = backtrace(stack, 100); \
+  backtrace_symbols_fd(stack, depth, PANDORA_PRINTSTACK_STD_PREFIX fileno(a)); \
+}
+#elif defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE) && defined(HAVE_BACKTRACE_SYMBOLS) && !defined(HAVE_BACKTRACE_SYMBOLS_FD)
+
+#include <execinfo.h>
+
+#define pandora_print_callstack(a) \
+{ \
+  void *stack[100];  \
+  int depth= backtrace(stack, 100); \
+  char **symbol= backtrace_symbols(stack, depth); \
+  for (int x= 0; x < size; ++x) \
+    PANDORA_PRINTSTACK_STD_PREFIX fprintf(a, "%s\n", symbol[x]); \
+}
+#else
+#define pandora_print_callstack(a) \
+    PANDORA_PRINTSTACK_STD_PREFIX fprintf(a, \
+      "Stackdump not supported for this platform\n");
+#endif
+  ])
+])