[libbacktrace] Add altlink field to struct dwarf_data

Add an altlink field to struct dwarf_data, and initialize it with the pointer
to the struct dwarf_data for the .gnu_debugaltlink.

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

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

git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@267994 138bc75d-0d04-0410-961f-82ee72b054a4

6 files changed, 22 insertions, 2 deletions

diff --git a/libbacktrace/ChangeLog b/libbacktrace/ChangeLog
index f2d2954b1c6..dfb17f5905e 100644
--- a/libbacktrace/ChangeLog
+++ b/libbacktrace/ChangeLog
@@ -1,5 +1,15 @@
 2019-01-17  Tom de Vries  <tdevries@suse.de>
 
+	* dwarf.c (struct dwarf_data): Add altlink field.
+	(backtrace_dwarf_add): Add and handle fileline_altlink parameter.
+	* elf.c	(elf_add): Add argument to backtrace_dwarf_add call.
+	(phdr_callback, backtrace_initialize): Add argument to elf_add calls.
+	* internal.h (backtrace_dwarf_add): Add fileline_altlink parameter.
+	* 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>
+
 	* 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
diff --git a/libbacktrace/dwarf.c b/libbacktrace/dwarf.c
index 190c6fc131f..83cdb52ef26 100644
--- a/libbacktrace/dwarf.c
+++ b/libbacktrace/dwarf.c
@@ -343,6 +343,8 @@ struct dwarf_data
 {
   /* The data for the next file we know about.  */
   struct dwarf_data *next;
+  /* The data for .gnu_debugaltlink.  */
+  struct dwarf_data *altlink;
   /* The base address for this file.  */
   uintptr_t base_address;
   /* A sorted list of address ranges.  */
@@ -3000,6 +3002,7 @@ build_dwarf_data (struct backtrace_state *state,
 		  const unsigned char *dwarf_str,
 		  size_t dwarf_str_size,
 		  int is_bigendian,
+		  struct dwarf_data *altlink,
 		  backtrace_error_callback error_callback,
 		  void *data)
 {
@@ -3028,6 +3031,7 @@ build_dwarf_data (struct backtrace_state *state,
     return NULL;
 
   fdata->next = NULL;
+  fdata->altlink = altlink;
   fdata->base_address = base_address;
   fdata->addrs = addrs;
   fdata->addrs_count = addrs_count;
@@ -3063,6 +3067,7 @@ backtrace_dwarf_add (struct backtrace_state *state,
 		     const unsigned char *dwarf_str,
 		     size_t dwarf_str_size,
 		     int is_bigendian,
+		     struct dwarf_data *fileline_altlink,
 		     backtrace_error_callback error_callback,
 		     void *data, fileline *fileline_fn,
 		     struct dwarf_data **fileline_entry)
@@ -3073,7 +3078,7 @@ backtrace_dwarf_add (struct backtrace_state *state,
 			    dwarf_line, dwarf_line_size, dwarf_abbrev,
 			    dwarf_abbrev_size, dwarf_ranges, dwarf_ranges_size,
 			    dwarf_str, dwarf_str_size, is_bigendian,
-			    error_callback, data);
+			    fileline_altlink, error_callback, data);
   if (fdata == NULL)
     return 0;
 
diff --git a/libbacktrace/elf.c b/libbacktrace/elf.c
index a863327df10..87e7b0d361d 100644
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
@@ -3097,6 +3097,7 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
       debuglink_view_valid = 0;
     }
 
+  struct dwarf_data *fileline_altlink = NULL;
   if (debugaltlink_name != NULL)
     {
       int d;
@@ -3108,7 +3109,7 @@ 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, NULL,
+			 fileline_fn, found_sym, found_dwarf, &fileline_altlink,
 			 0, 1, debugaltlink_buildid_data,
 			 debugaltlink_buildid_size);
 	  backtrace_release_view (state, &debugaltlink_view, error_callback,
@@ -3265,6 +3266,7 @@ 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,
+			    fileline_altlink,
 			    error_callback, data, fileline_fn,
 			    fileline_entry))
     goto fail;
diff --git a/libbacktrace/internal.h b/libbacktrace/internal.h
index d9ab401ce41..e8389779322 100644
--- a/libbacktrace/internal.h
+++ b/libbacktrace/internal.h
@@ -303,6 +303,7 @@ extern int backtrace_dwarf_add (struct backtrace_state *state,
 				const unsigned char *dwarf_str,
 				size_t dwarf_str_size,
 				int is_bigendian,
+				struct dwarf_data *fileline_altlink,
 				backtrace_error_callback error_callback,
 				void *data, fileline *fileline_fn,
 				struct dwarf_data **fileline_entry);
diff --git a/libbacktrace/pecoff.c b/libbacktrace/pecoff.c
index cd20cbe17a7..da1982fd3ca 100644
--- a/libbacktrace/pecoff.c
+++ b/libbacktrace/pecoff.c
@@ -867,6 +867,7 @@ coff_add (struct backtrace_state *state, int descriptor,
 			    sections[DEBUG_STR].data,
 			    sections[DEBUG_STR].size,
 			    0, /* FIXME */
+			    NULL,
 			    error_callback, data, fileline_fn,
 			    NULL))
     goto fail;
diff --git a/libbacktrace/xcoff.c b/libbacktrace/xcoff.c
index 095800b4f71..d50b5bc517e 100644
--- a/libbacktrace/xcoff.c
+++ b/libbacktrace/xcoff.c
@@ -1315,6 +1315,7 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
 				dwsect[DWSECT_STR].data,
 				dwsect[DWSECT_STR].size,
 				1, /* big endian */
+				NULL,
 				error_callback, data, fileline_fn,
 				NULL))
 	goto fail;