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[Patch, tentative] Show output section size contribution from each input file in map file
- From: Senthil Kumar Selvaraj <senthil_kumar dot selvaraj at atmel dot com>
- To: <binutils at sourceware dot org>
- Cc: <nickc at redhat dot com>
- Date: Wed, 20 May 2015 18:14:46 +0530
- Subject: [Patch, tentative] Show output section size contribution from each input file in map file
- Authentication-results: sourceware.org; auth=none
Hi,
This very rough patch adds extra information to the map file to show
how much each input file contributed to output sections in the output
file. While this information can already by computed by
grepping/summing existing map file output, this patch makes that
unnecessary - it groups by input bfd.
The primary motivation is to help embedded developers (or anyone who is
paranoid about code size) quickly figure out where most of the code/data
is coming from.
This is how the output looks (for an AVR ELF).
<snip>
Input files and contributions to output file.
/home/saaadhu/avr/install/lib/gcc/avr/6.0.0/../../../../avr/lib/avr51/crtatmega1280.o
.text 0xf6
.note.gnu.avr.deviceinfo
0x40
.debug_info 0xbbc
.debug_abbrev 0xb1a
.debug_line 0x1d
.debug_str 0x3e9
/tmp/cclzAVJF.o
.text 0x12
.comment 0x29
_exit.o
.text 0x4
.debug_aranges 0x20
.debug_info 0x93
.debug_abbrev 0x14
.debug_line 0x70
_clear_bss.o
.text 0x10
.debug_aranges 0x20
.debug_info 0x93
.debug_abbrev 0x14
.debug_line 0x94
What do you guys think? Is there a better way to do this?
Regards
Senthil
diff --git a/ld/ldlang.c b/ld/ldlang.c
index c96c21f..bf97f57 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -2052,6 +2052,15 @@ lang_map_flags (flagword flag)
minfo ("l");
}
+
+static bfd_boolean
+is_section_discarded (asection *s)
+{
+ return ((s->output_section == NULL
+ || s->output_section->owner != link_info.output_bfd)
+ && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0);
+}
+
void
lang_map (void)
{
@@ -2067,9 +2076,7 @@ lang_map (void)
continue;
for (s = file->the_bfd->sections; s != NULL; s = s->next)
- if ((s->output_section == NULL
- || s->output_section->owner != link_info.output_bfd)
- && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0)
+ if (is_section_discarded (s))
{
if (! dis_header_printed)
{
@@ -2133,6 +2140,66 @@ lang_map (void)
lang_statement_iteration++;
print_statements ();
+ fprintf (config.map_file, _("\nInput files and contributions to "
+ "output file."));
+
+ LANG_FOR_EACH_INPUT_STATEMENT (f)
+ {
+ if ((f->the_bfd->flags & (BFD_LINKER_CREATED | DYNAMIC)) != 0
+ || f->flags.just_syms || f->the_bfd->filename == NULL)
+ continue;
+
+ bfd_boolean does_bfd_contribute = FALSE;
+
+ lang_output_section_statement_type *os;
+ for (os = &lang_output_section_statement.head->output_section_statement;
+ os != NULL;
+ os = os->next)
+ {
+ asection *output_section = os->bfd_section;
+ if (output_section == NULL)
+ continue;
+
+ asection *i;
+ bfd_size_type size_from_this_bfd = 0;
+
+ for (i = f->the_bfd->sections; i != NULL; i = i->next)
+ {
+ if (is_section_discarded (i))
+ continue;
+
+ if (i->output_section == output_section)
+ size_from_this_bfd += i->size;
+ }
+
+ if (size_from_this_bfd > 0)
+ {
+ int len;
+
+ if (does_bfd_contribute == FALSE)
+ {
+ does_bfd_contribute = TRUE;
+ fprintf (config.map_file, "\n\n%s\n", f->the_bfd->filename);
+ }
+
+ minfo ("\n%s", output_section->name);
+
+ len = strlen (output_section->name);
+ if (len >= SECTION_NAME_MAP_LENGTH - 1)
+ {
+ print_nl ();
+ len = 0;
+ }
+ while (len < SECTION_NAME_MAP_LENGTH)
+ {
+ print_space ();
+ ++len;
+ }
+ minfo ("%W", size_from_this_bfd);
+ }
+ }
+ }
+
ldemul_extra_map_file_text (link_info.output_bfd, &link_info, config.map_file);
}