[libbacktrace] Return struct dwarf_data pointer from elf_add

Allow the caller of elf_add access to the struct dwarf_data pointer
corresponding to the added elf.

2019-01-17  Tom de Vries  <tdevries@suse.de>

	* internal.h (backtrace_dwarf_add): Add fileline_entry parameter.
	* dwarf.c (backtrace_dwarf_add): Add and handle fileline_entry parameter.
	* elf.c	(elf_add): Add and handle fileline_entry parameter.  Add
	argument to backtrace_dwarf_add call.
	(phdr_callback, backtrace_initialize): Add argument to elf_add calls.
	* pecoff.c (coff_add): Add argument to backtrace_dwarf_add call.
	* xcoff.c (xcoff_add): Same.

From-SVN: r267993

libbacktrace/ChangeLog

 2019-01-17  Tom de Vries  <tdevries@suse.de>
 
+	* internal.h (backtrace_dwarf_add): Add fileline_entry parameter.
+	* dwarf.c (backtrace_dwarf_add): Add and handle fileline_entry parameter.
+	* elf.c	(elf_add): Add and handle fileline_entry parameter.  Add
+	argument to backtrace_dwarf_add call.
+	(phdr_callback, backtrace_initialize): Add argument to elf_add calls.
+	* pecoff.c (coff_add): Add argument to backtrace_dwarf_add call.
+	* xcoff.c (xcoff_add): Same.
+
+2019-01-17  Tom de Vries  <tdevries@suse.de>
+
 	* elf.c (elf_add): Add and handle with_buildid_data and
 	with_buildid_size parameters.  Handle .gnu_debugaltlink section.
 	(phdr_callback, backtrace_initialize): Add arguments to elf_add calls.

libbacktrace/dwarf.c

@@ -3064,7 +3064,8 @@ backtrace_dwarf_add (struct backtrace_state *state,
 		     size_t dwarf_str_size,
 		     int is_bigendian,
 		     backtrace_error_callback error_callback,
-		     void *data, fileline *fileline_fn)
+		     void *data, fileline *fileline_fn,
+		     struct dwarf_data **fileline_entry)
 {
   struct dwarf_data *fdata;
 
@@ -3076,6 +3077,9 @@ backtrace_dwarf_add (struct backtrace_state *state,
   if (fdata == NULL)
     return 0;
 
+  if (fileline_entry != NULL)
+    *fileline_entry = fdata;
+
   if (!state->threaded)
     {
       struct dwarf_data **pp;

libbacktrace/elf.c

@@ -2638,8 +2638,8 @@ static int
 elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 	 uintptr_t base_address, backtrace_error_callback error_callback,
 	 void *data, fileline *fileline_fn, int *found_sym, int *found_dwarf,
-	 int exe, int debuginfo, const char *with_buildid_data,
-	 uint32_t with_buildid_size)
+	 struct dwarf_data **fileline_entry, int exe, int debuginfo,
+	 const char *with_buildid_data, uint32_t with_buildid_size)
 {
   struct backtrace_view ehdr_view;
   b_elf_ehdr ehdr;
@@ -3042,7 +3042,8 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 	    backtrace_release_view (state, &debugaltlink_view, error_callback,
 				    data);
 	  ret = elf_add (state, NULL, d, base_address, error_callback, data,
-			 fileline_fn, found_sym, found_dwarf, 0, 1, NULL, 0);
+			 fileline_fn, found_sym, found_dwarf, NULL, 0, 1, NULL,
+			 0);
 	  if (ret < 0)
 	    backtrace_close (d, error_callback, data);
 	  else
@@ -3080,7 +3081,8 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 	    backtrace_release_view (state, &debugaltlink_view, error_callback,
 				    data);
 	  ret = elf_add (state, NULL, d, base_address, error_callback, data,
-			 fileline_fn, found_sym, found_dwarf, 0, 1, NULL, 0);
+			 fileline_fn, found_sym, found_dwarf, NULL, 0, 1, NULL,
+			 0);
 	  if (ret < 0)
 	    backtrace_close (d, error_callback, data);
 	  else
@@ -3106,8 +3108,9 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 	  int ret;
 
 	  ret = elf_add (state, filename, d, base_address, error_callback, data,
-			 fileline_fn, found_sym, found_dwarf, 0, 1,
-			 debugaltlink_buildid_data, debugaltlink_buildid_size);
+			 fileline_fn, found_sym, found_dwarf, NULL,
+			 0, 1, debugaltlink_buildid_data,
+			 debugaltlink_buildid_size);
 	  backtrace_release_view (state, &debugaltlink_view, error_callback,
 				  data);
 	  debugaltlink_view_valid = 0;
@@ -3262,7 +3265,8 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 			    sections[DEBUG_STR].data,
 			    sections[DEBUG_STR].size,
 			    ehdr.e_ident[EI_DATA] == ELFDATA2MSB,
-			    error_callback, data, fileline_fn))
+			    error_callback, data, fileline_fn,
+			    fileline_entry))
     goto fail;
 
   *found_dwarf = 1;
@@ -3352,7 +3356,7 @@ phdr_callback (struct dl_phdr_info *info, size_t size ATTRIBUTE_UNUSED,
 
   if (elf_add (pd->state, filename, descriptor, info->dlpi_addr,
 	       pd->error_callback, pd->data, &elf_fileline_fn, pd->found_sym,
-	       &found_dwarf, 0, 0, NULL, 0))
+	       &found_dwarf, NULL, 0, 0, NULL, 0))
     {
       if (found_dwarf)
 	{
@@ -3380,7 +3384,8 @@ backtrace_initialize (struct backtrace_state *state, const char *filename,
   struct phdr_data pd;
 
   ret = elf_add (state, filename, descriptor, 0, error_callback, data,
-		 &elf_fileline_fn, &found_sym, &found_dwarf, 1, 0, NULL, 0);
+		 &elf_fileline_fn, &found_sym, &found_dwarf, NULL, 1, 0, NULL,
+		 0);
   if (!ret)
     return 0;
 

libbacktrace/internal.h

@@ -286,6 +286,8 @@ extern int backtrace_initialize (struct backtrace_state *state,
 				 void *data,
 				 fileline *fileline_fn);
 
+struct dwarf_data;
+
 /* Add file/line information for a DWARF module.  */
 
 extern int backtrace_dwarf_add (struct backtrace_state *state,
@@ -302,7 +304,8 @@ extern int backtrace_dwarf_add (struct backtrace_state *state,
 				size_t dwarf_str_size,
 				int is_bigendian,
 				backtrace_error_callback error_callback,
-				void *data, fileline *fileline_fn);
+				void *data, fileline *fileline_fn,
+				struct dwarf_data **fileline_entry);
 
 /* A test-only hook for elf_uncompress_zdebug.  */
 

libbacktrace/pecoff.c

@@ -867,7 +867,8 @@ coff_add (struct backtrace_state *state, int descriptor,
 			    sections[DEBUG_STR].data,
 			    sections[DEBUG_STR].size,
 			    0, /* FIXME */
-			    error_callback, data, fileline_fn))
+			    error_callback, data, fileline_fn,
+			    NULL))
     goto fail;
 
   *found_dwarf = 1;

libbacktrace/xcoff.c

@@ -1315,7 +1315,8 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
 				dwsect[DWSECT_STR].data,
 				dwsect[DWSECT_STR].size,
 				1, /* big endian */
-				error_callback, data, fileline_fn))
+				error_callback, data, fileline_fn,
+				NULL))
 	goto fail;
     }