Commit 57cefb59 authored by Mathieu Duponchelle's avatar Mathieu Duponchelle 🐸 Committed by Mathieu Duponchelle

gstinfo: add Windows stacktraces support

This uses the DbgHelp library if available
parent c816ec4f
......@@ -155,6 +155,12 @@ static char *gst_info_printf_pointer_extension_func (const char *format,
#define BT_BUF_SIZE 100
#endif /* HAVE_BACKTRACE */
#ifdef HAVE_DBGHELP
#include <Windows.h>
#include <dbghelp.h>
#include <tlhelp32.h>
#endif /* HAVE_DBGHELP */
extern gboolean gst_is_initialized (void);
/* we want these symbols exported even if debug is disabled, to maintain
......@@ -2763,6 +2769,98 @@ generate_backtrace_trace (void)
#define generate_backtrace_trace() NULL
#endif /* HAVE_BACKTRACE */
#ifdef HAVE_DBGHELP
static void
dbghelp_initialize_symbols (HANDLE process)
{
static gsize initialization_value = 0;
if (g_once_init_enter (&initialization_value)) {
GST_INFO ("Initializing Windows symbol handler");
SymSetOptions (SYMOPT_LOAD_LINES);
SymInitialize (process, NULL, TRUE);
GST_INFO ("Initialized Windows symbol handler");
g_once_init_leave (&initialization_value, 1);
}
}
static gchar *
generate_dbghelp_trace (void)
{
HANDLE process = GetCurrentProcess ();
HANDLE thread = GetCurrentThread ();
IMAGEHLP_MODULE64 module_info;
DWORD machine;
CONTEXT context;
STACKFRAME64 frame = { 0 };
PVOID save_context;
GString *trace = g_string_new (NULL);
dbghelp_initialize_symbols (process);
memset (&context, 0, sizeof (CONTEXT));
context.ContextFlags = CONTEXT_FULL;
RtlCaptureContext (&context);
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrStack.Mode = AddrModeFlat;
frame.AddrFrame.Mode = AddrModeFlat;
#if (defined _M_IX86)
machine = IMAGE_FILE_MACHINE_I386;
frame.AddrFrame.Offset = context.Ebp;
frame.AddrPC.Offset = context.Eip;
frame.AddrStack.Offset = context.Esp;
#elif (defined _M_X64)
machine = IMAGE_FILE_MACHINE_AMD64;
frame.AddrFrame.Offset = context.Rbp;
frame.AddrPC.Offset = context.Rip;
frame.AddrStack.Offset = context.Rsp;
#else
goto done;
#endif
module_info.SizeOfStruct = sizeof (module_info);
save_context = (machine == IMAGE_FILE_MACHINE_I386) ? NULL : &context;
while (TRUE) {
char buffer[sizeof (SYMBOL_INFO) + MAX_SYM_NAME * sizeof (TCHAR)];
PSYMBOL_INFO symbol = (PSYMBOL_INFO) buffer;
IMAGEHLP_LINE64 line;
DWORD displacement = 0;
symbol->SizeOfStruct = sizeof (SYMBOL_INFO);
symbol->MaxNameLen = MAX_SYM_NAME;
line.SizeOfStruct = sizeof (line);
if (!StackWalk64 (machine, process, thread, &frame, save_context, 0,
SymFunctionTableAccess64, SymGetModuleBase64, 0))
break;
if (SymFromAddr (process, frame.AddrPC.Offset, 0, symbol))
g_string_append_printf (trace, "%s ", symbol->Name);
else
g_string_append (trace, "?? ");
if (SymGetLineFromAddr64 (process, frame.AddrPC.Offset, &displacement,
&line))
g_string_append_printf (trace, "(%s:%u)", line.FileName, line.LineNumber);
else if (SymGetModuleInfo64 (process, frame.AddrPC.Offset, &module_info))
g_string_append_printf (trace, "(%s)", module_info.ImageName);
else
g_string_append_printf (trace, "(%s)", "??");
g_string_append (trace, "\n");
}
done:
return g_string_free (trace, FALSE);
}
#endif /* HAVE_DBGHELP */
/**
* gst_debug_get_stack_trace:
* @flags: A set of #GstStackTraceFlags to determine how the stack
......@@ -2788,6 +2886,10 @@ gst_debug_get_stack_trace (GstStackTraceFlags flags)
trace = generate_unwind_trace (flags);
#endif /* HAVE_UNWIND */
#ifdef HAVE_DBGHELP
trace = generate_dbghelp_trace ();
#endif
if (trace)
return trace;
else if (have_backtrace)
......@@ -2799,7 +2901,7 @@ gst_debug_get_stack_trace (GstStackTraceFlags flags)
/**
* gst_debug_print_stack_trace:
*
* If libunwind or glibc backtrace are present
* If libunwind, glibc backtrace or DbgHelp are present
* a stack trace is printed.
*/
void
......
......@@ -348,7 +348,8 @@ endif
backtrace_deps = []
unwind_dep = dependency('libunwind', required : get_option('libunwind'))
dw_dep = dependency('libdw', required: get_option('libdw'))
backtrace_deps = [unwind_dep, dw_dep]
dbghelp_dep = dependency('DbgHelp', required : get_option('dbghelp'))
backtrace_deps = [unwind_dep, dw_dep, dbghelp_dep]
if unwind_dep.found()
cdata.set('HAVE_UNWIND', 1)
if dw_dep.found()
......@@ -356,12 +357,12 @@ if unwind_dep.found()
else
message('Support for backtraces is partial only.')
endif
elif cc.has_function('backtrace')
cdata.set('HAVE_BACKTRACE', 1)
elif dbghelp_dep.found()
cdata.set('HAVE_DBGHELP', 1)
else
if cc.has_function('backtrace')
cdata.set('HAVE_BACKTRACE', 1)
else
message('NO backtraces support.')
endif
message('NO backtraces support.')
endif
if cc.has_header('execinfo.h')
......
......@@ -21,6 +21,7 @@ option('memory-alignment', type: 'combo',
option('check', type : 'feature', value : 'auto', description : 'Build unit test libraries')
option('libunwind', type : 'feature', value : 'auto', description : 'Use libunwind to generate backtraces')
option('libdw', type : 'feature', value : 'auto', description : 'Use libdw to generate better backtraces from libunwind')
option('dbghelp', type : 'feature', value : 'auto', description : 'Use dbghelp to generate backtraces')
option('bash-completion', type : 'feature', value : 'auto', description : 'Install bash completion files')
# Common feature options
......
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