functions.c: backtraceHandler(): use libunwind and libelf-utils to provide stacktrace with source code line numbers

src/CMakeLists.txt

@@ -4,6 +4,8 @@ set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
 pkg_check_modules(RPM REQUIRED rpm)
 pkg_check_modules(SQLITE3 REQUIRED sqlite3)
+pkg_check_modules(LIBUNWIND REQUIRED libunwind)
+pkg_check_modules(LIBDW REQUIRED libdw)
 find_library(LIBIBERTY NAMES iberty)
 
 include_directories(include)
@@ -42,9 +44,11 @@ target_link_libraries(distromatic
   ${RPM_LIBRARIES}
   ${ZLIB_LIBRARIES}
   ${SQLITE3_LIBRARIES}
+  ${LIBUNWIND_LIBRARIES}
+  ${LIBDW_LIBRARIES}
   ${LIBIBERTY}
 )
-target_include_directories(distromatic PUBLIC ${RPM_INCLUDE_DIRS})
+target_include_directories(distromatic PUBLIC ${RPM_INCLUDE_DIRS} ${LIBUNWIND_INCLUDE_DIRS})
 #
 # NOTE: -fno-toplevel-reorder required to prevent Sqlite3 weird problems
 #
@@ -64,9 +68,11 @@ target_link_libraries(distroquery
   ${RPM_LIBRARIES}
   ${ZLIB_LIBRARIES}
   ${SQLITE3_LIBRARIES}
+  ${LIBUNWIND_LIBRARIES}
+  ${LIBDW_LIBRARIES}
   ${LIBIBERTY}
 )
-target_include_directories(distroquery PUBLIC ${RPM_INCLUDE_DIRS})
+target_include_directories(distroquery PUBLIC ${RPM_INCLUDE_DIRS} ${LIBUNWIND_INCLUDE_DIRS})
 
 install(
   TARGETS distromatic

src/distromatic.c

@@ -113,7 +113,7 @@ int handleObsoletedPackages(struct configTag *ct, int arch);
 
 static const char *copyright[] = {
 PACKAGE_NAME " version " PACKAGE_VERSION,
-"Copyright (C) 2004-2020 by Silvan Calarco <silvan.calarco@mambasoft.it>",
+"Copyright (C) 2004-2021 by Silvan Calarco <silvan.calarco@mambasoft.it>",
 "Copyright (C) 2006 by Davide Madrisan <davide.madrisan@gmail.com>",
 (char *)0
 };
@@ -162,7 +162,7 @@ static const char *helpmsg[] = {
 " -v, --version              display version and exit",
 "",
 "Examples:",
-" distromatic -t devel --genhtml --deps-table",
+" distromatic -t devel --genhtml --gendatatables",
 " distromatic -t stable/2.0 --changelogsince 010106",
 "",
 "Please report bugs to <"PACKAGE_BUGREPORT">.",

src/functions.c

@@ -1,7 +1,7 @@
 /*
  * distromatic - tool for RPM based repositories
  *
- * Copyright (C) 2004-2020 by Silvan Calarco <silvan.calarco@mambasoft.it>
+ * Copyright (C) 2004-2021 by Silvan Calarco <silvan.calarco@mambasoft.it>
  * Copyright (C) 2006 by Davide Madrisan <davide.madrisan@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify it under
@@ -67,29 +67,81 @@
 #include "functions.h"
 #include "changelog.h"
 
-#include <execinfo.h>
+#define UNW_LOCAL_ONLY
+#include <elfutils/libdwfl.h>
+#include <libunwind.h>
+#include <assert.h>
 
 static int debug_log = 0;
 static struct configDefaults configdefaults;
 static struct configTag *firstconfigtag = NULL;
 
 /* Obtain a backtrace and print it to stdout. */
+static void debugInfo(FILE *out, const void* ip)
+{
+	char *debuginfo_path=NULL;
+
+	Dwfl_Callbacks callbacks={
+		.find_elf=dwfl_linux_proc_find_elf,
+		.find_debuginfo=dwfl_standard_find_debuginfo,
+		.debuginfo_path=&debuginfo_path,
+	};
+
+	Dwfl* dwfl=dwfl_begin(&callbacks);
+	assert(dwfl!=NULL);
+
+	assert(dwfl_linux_proc_report (dwfl, getpid())==0);
+	assert(dwfl_report_end (dwfl, NULL, NULL)==0);
+
+	Dwarf_Addr addr = (uintptr_t)ip;
+
+	Dwfl_Module* module=dwfl_addrmodule (dwfl, addr);
+
+	const char* function_name = dwfl_module_addrname(module, addr);
+
+	fprintf(out, "%s(",function_name);
+
+	Dwfl_Line *line=dwfl_getsrc (dwfl, addr);
+	if(line!=NULL)
+	{
+		int nline;
+		Dwarf_Addr addr;
+		const char* filename=dwfl_lineinfo (line, &addr,&nline,NULL,NULL,NULL);
+		fprintf(out, "%s:%d",strrchr(filename,'/')+1,nline);
+	}
+	else
+	{
+    const char *module_name = dwfl_module_info(module,
+            NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+    fprintf(out, "in %s", module_name);
+	}
+}
+
 void backtraceHandler(int sig)
 {
-   void *array[10];
+  unw_context_t uc;
-   size_t size;
+  unw_getcontext(&uc);
-   char **strings;
-   size_t i;
 
-   size = backtrace (array, 10);
+  unw_cursor_t cursor;
-   strings = (char**)backtrace_symbols (array, size);
+  unw_init_local(&cursor, &uc);
 
-   fprintf(stderr, "Obtained %zd stack frames.\n", size);
+  fprintf(stderr, "*** Received signal %d; stack trace: ***\n", sig);
 
-   for (i = 0; i < size; i++)
+  while(unw_step(&cursor)>0) {
-      fprintf(stderr, "%s\n", strings[i]);
+    unw_word_t ip;
+    unw_get_reg(&cursor, UNW_REG_IP, &ip);
 
-   free (strings);
+    unw_word_t offset;
+    char name[32];
+    assert(unw_get_proc_name(&cursor, name,sizeof(name), &offset)==0);
+
+    fprintf(stderr, "\tat ");
+    debugInfo(stderr, (void*)(ip-4));
+    fprintf(stderr, ")\n");
+
+    if(strcmp(name,"main")==0)
+      break;
+  }
    exit(1);
 }