From: "Björn Schäpers" <gcc@hazardy.de>
To: gcc-patches@gcc.gnu.org, gcc@gcc.gnu.org
Subject: [PATCH 4/4] libbacktrace: get debug information for loaded dlls
Date: Fri, 20 Jan 2023 11:54:09 +0100 [thread overview]
Message-ID: <20230120105409.54949-4-gcc@hazardy.de> (raw)
In-Reply-To: <20230120105409.54949-1-gcc@hazardy.de>
From: Björn Schäpers <bjoern@hazardy.de>
Fixes https://github.com/ianlancetaylor/libbacktrace/issues/53, except
that libraries loaded after the backtrace_initialize are not handled.
But as far as I can see that's the same for elf.
Tested on x86_64-linux and i686-w64-mingw32.
-- >8 --
* pecoff.c (coff_add): New argument for the module handle of the
file, to get the base address.
* pecoff.c (backtrace_initialize): Iterate over loaded libraries
and call coff_add.
Signed-off-by: Björn Schäpers <bjoern@hazardy.de>
---
libbacktrace/pecoff.c | 76 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 72 insertions(+), 4 deletions(-)
diff --git a/libbacktrace/pecoff.c b/libbacktrace/pecoff.c
index 296f1357b5f..40395109e51 100644
--- a/libbacktrace/pecoff.c
+++ b/libbacktrace/pecoff.c
@@ -49,6 +49,7 @@ POSSIBILITY OF SUCH DAMAGE. */
#endif
#include <windows.h>
+#include <psapi.h>
#endif
/* Coff file header. */
@@ -592,7 +593,8 @@ coff_syminfo (struct backtrace_state *state, uintptr_t addr,
static int
coff_add (struct backtrace_state *state, int descriptor,
backtrace_error_callback error_callback, void *data,
- fileline *fileline_fn, int *found_sym, int *found_dwarf)
+ fileline *fileline_fn, int *found_sym, int *found_dwarf,
+ uintptr_t module_handle ATTRIBUTE_UNUSED)
{
struct backtrace_view fhdr_view;
off_t fhdr_off;
@@ -623,7 +625,6 @@ coff_add (struct backtrace_state *state, int descriptor,
int is_64;
uintptr_t image_base;
uintptr_t base_address = 0;
- uintptr_t module_handle;
struct dwarf_sections dwarf_sections;
*found_sym = 0;
@@ -871,7 +872,6 @@ coff_add (struct backtrace_state *state, int descriptor,
}
#ifdef HAVE_WINDOWS_H
- module_handle = (uintptr_t) GetModuleHandleW (NULL);
base_address = module_handle - image_base;
#endif
@@ -914,12 +914,80 @@ backtrace_initialize (struct backtrace_state *state,
int found_sym;
int found_dwarf;
fileline coff_fileline_fn;
+ uintptr_t module_handle = 0;
+
+#ifdef HAVE_WINDOWS_H
+ DWORD i;
+ DWORD module_count;
+ DWORD bytes_needed_for_modules;
+ HMODULE *modules;
+ char module_name[MAX_PATH];
+ int module_found_sym;
+ fileline module_fileline_fn;
+
+ module_handle = (uintptr_t) GetModuleHandleW (NULL);
+#endif
ret = coff_add (state, descriptor, error_callback, data,
- &coff_fileline_fn, &found_sym, &found_dwarf);
+ &coff_fileline_fn, &found_sym, &found_dwarf, module_handle);
if (!ret)
return 0;
+#ifdef HAVE_WINDOWS_H
+ module_count = 1000;
+ alloc_modules:
+ modules = backtrace_alloc (state, module_count * sizeof(HMODULE),
+ error_callback, data);
+ if (modules == NULL)
+ goto skip_modules;
+ if (!EnumProcessModules (GetCurrentProcess (), modules, module_count,
+ &bytes_needed_for_modules))
+ {
+ error_callback(data, "Could not enumerate process modules",
+ (int) GetLastError ());
+ goto free_modules;
+ }
+ if (bytes_needed_for_modules > module_count * sizeof(HMODULE))
+ {
+ backtrace_free (state, modules, module_count * sizeof(HMODULE),
+ error_callback, data);
+ // Add an extra of 2, if some module is loaded in another thread.
+ module_count = bytes_needed_for_modules / sizeof(HMODULE) + 2;
+ modules = NULL;
+ goto alloc_modules;
+ }
+
+ for (i = 0; i < bytes_needed_for_modules / sizeof(HMODULE); ++i)
+ {
+ if (GetModuleFileNameA (modules[i], module_name, MAX_PATH - 1))
+ {
+ if (strcmp (filename, module_name) == 0)
+ continue;
+
+ module_handle = (uintptr_t) GetModuleHandleA (module_name);
+ if (module_handle == 0)
+ continue;
+
+ descriptor = backtrace_open (module_name, error_callback, data, NULL);
+ if (descriptor < 0)
+ continue;
+
+ coff_add (state, descriptor, error_callback, data,
+ &module_fileline_fn, &module_found_sym, &found_dwarf,
+ module_handle);
+ if (module_found_sym)
+ found_sym = 1;
+ }
+ }
+
+ free_modules:
+ if (modules)
+ backtrace_free(state, modules, module_count * sizeof(HMODULE),
+ error_callback, data);
+ modules = NULL;
+ skip_modules:
+#endif
+
if (!state->threaded)
{
if (found_sym)
--
2.38.1
next prev parent reply other threads:[~2023-01-20 10:54 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-20 10:54 [PATCH 1/4] libbacktrace: change all pc related variables to uintptr_t Björn Schäpers
2023-01-20 10:54 ` [PATCH 2/4] libbacktrace: detect executable path on windows Björn Schäpers
2023-01-23 23:00 ` Ian Lance Taylor
2023-01-24 13:11 ` Eli Zaretskii
2023-01-24 14:35 ` Ian Lance Taylor
2023-01-24 16:52 ` Eli Zaretskii
2023-01-24 17:58 ` Ian Lance Taylor
2023-01-24 18:11 ` Eli Zaretskii
2023-01-24 18:32 ` Ian Lance Taylor
2023-02-05 9:20 ` Björn Schäpers
2023-02-06 0:22 ` Ian Lance Taylor
2023-11-20 19:56 ` Björn Schäpers
2023-11-29 22:05 ` Ian Lance Taylor
2023-01-24 21:00 ` Björn Schäpers
2023-01-20 10:54 ` [PATCH 3/4] libbacktrace: work with aslr " Björn Schäpers
2023-01-20 13:39 ` Eli Zaretskii
2023-01-20 16:46 ` Gabriel Ravier
2023-01-20 19:19 ` Eli Zaretskii
2023-01-20 20:39 ` Gabriel Ravier
2023-01-21 4:05 ` Eli Zaretskii
2023-01-21 9:18 ` LIU Hao
2023-01-21 9:25 ` Eli Zaretskii
2023-01-21 10:47 ` Gabriel Ravier
2023-01-21 11:42 ` Eli Zaretskii
2023-11-20 19:57 ` Björn Schäpers
2023-11-20 20:07 ` Eli Zaretskii
2023-11-21 19:35 ` Björn Schäpers
2023-11-22 1:13 ` LIU Hao
2023-11-30 19:25 ` Ian Lance Taylor
2023-01-20 10:54 ` Björn Schäpers [this message]
2023-11-30 19:53 ` [PATCH 4/4] libbacktrace: get debug information for loaded dlls Ian Lance Taylor
2023-11-30 20:16 ` Eli Zaretskii
2024-01-02 23:12 ` Björn Schäpers
2024-01-04 22:33 ` [PATCH 5/4] libbacktrace: improve getting " Björn Schäpers
2024-01-06 22:15 ` [PATCH 6/4] libbacktrace: Add loaded dlls after initialize Björn Schäpers
2024-01-07 6:50 ` Eli Zaretskii
[not found] ` <4cb3a2a5-c0b3-40c8-b460-f21d65a9aea2@hazardy.de>
2024-01-07 14:46 ` Eli Zaretskii
2024-01-07 16:07 ` Björn Schäpers
2024-01-07 17:03 ` Eli Zaretskii
2024-01-09 20:02 ` Björn Schäpers
2024-01-10 12:34 ` Eli Zaretskii
2024-03-15 20:41 ` Björn Schäpers
2024-07-29 16:46 ` Ian Lance Taylor
2024-07-29 17:58 ` Eli Zaretskii
2024-07-29 19:41 ` Björn Schäpers
2024-07-30 16:28 ` Ian Lance Taylor
2024-01-23 22:37 ` [PATCH 5/4] libbacktrace: improve getting debug information for loaded dlls Ian Lance Taylor
2024-01-25 19:53 ` Björn Schäpers
2024-01-25 22:04 ` Ian Lance Taylor
2024-03-15 20:40 ` Björn Schäpers
2024-04-25 20:14 ` Björn Schäpers
2024-04-28 18:16 ` Ian Lance Taylor
2024-05-02 19:23 ` Björn Schäpers
2024-05-03 22:27 ` Ian Lance Taylor
2024-01-23 21:24 ` [PATCH 4/4] libbacktrace: get " Björn Schäpers
2023-01-20 22:25 ` [PATCH 1/4] libbacktrace: change all pc related variables to uintptr_t Ian Lance Taylor
2023-01-23 20:17 ` Björn Schäpers
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