In the meantime I crafted up this perl script. It does not use the linkmap. I found the linkmap to be very hard to parse reliably in a script. So what I do now is to run "nm" (can be your own nm, no need for the lx106 one) on the final *.o file (the one that goes into esptool(2) for image generation). And then collect all symbols them, sort them by section (not region!) and order them by size.
One remark though: the size of individual symbols if notoriously hard to establish. This script collects the size as stated from "nm" and also calculates the size, as difference from the symbol's address and the next one. Both of them are not 100% reliable. The first does not include alignment/padding and is sometimes wrong for no apparent reason. The second one does include the padding, but is also wrong sometimes, probably because there are symbols somehow "hidden" for nm.
Having said that, it has helped me greatly to clean up both DRAM (move rodata to flash) and IRAM (move functions to flash). Free DRAM went from 4k to 12k, even though almost all strings were already in flash. I'd say, give it a go...
Code: Select all#!/usr/bin/perl -w
no warnings 'portable';
use Data::Dumper;
my($input) = $ARGV[0];
my($fd);
my($symbol, $address, $class, $type, $size, $line, $section, $source);
my(%symbols, %value);
my(%sections) = (
"bss" =>
{
"data" => 1,
"start" => hex("3ffe8000"),
"end" => hex("3fffbfff"),
},
"data" =>
{
"data" => 1,
"start" => hex("3ffe8000"),
"end" => hex("3fffbfff"),
},
"irom0.text" =>
{
"data" => 0,
"start" => hex("0x40200000"),
"end" => hex("0x402fa000"),
},
"rodata" =>
{
"data" => 1,
"start" => hex("0x3ffe8000"),
"end" => hex("0x3fffbfff"),
},
"text" =>
{
"data" => 0,
"start" => hex("0x40100000"),
"end" => hex("0x40108000"),
},
);
my(%class_to_text) = (
"A" => "global absolute",
"a" => "local absolute",
"B" => "global bss",
"b" => "local bss",
"C" => "common",
"D" => "global data",
"d" => "local data",
"G" => "global sdata",
"g" => "local sdata",
"I" => "indirect",
"N" => "debug",
"n" => "comment",
"p" => "stack unwind",
"R" => "global rodata",
"r" => "local rodata",
"S" => "global sbbs",
"s" => "local sbbs",
"T" => "global text",
"t" => "local text",
"U" => "undefined",
"u" => "unique",
"V" => "WEAK1",
"v" => "weak1",
"W" => "WEAK2",
"w" => "weak2",
"-" => "stab",
"?" => "unknown",
"" => "",
);
die("failed to start nm") if(!open($fd, "nm -n -l -a -fsysv --synthetic " . $input . " |"));
while(<$fd>)
{
chomp();
($symbol, $address, $class, $type, $size, $line, $section, $source) =
m/^([^\s|]+)\s*\|\s*([0-9a-f]+)\s*\|\s*([^\s]+)\s*\|\s*([^\s|]*)\s*\|\s*([0-9a-f]*)\s*\|\s*([\^s|]*)\s*\|\s*([a-zA-Z0-9._*]*)\s*(.*)$/o;
next if(!defined($symbol) || !defined($address) || !defined($class) || !defined($type) || !defined($size) || !defined($line) || !defined($section) || !defined($source));
next if($section !~ m/^\.[a-zA-Z]+/g);
$section =~ s/^.//o;
undef(%value);
$value{name} = $symbol;
$value{address} = hex($address);
$value{size_1} = hex($size);
$value{class} = $class;
$value{type} = $type;
($value{source_file}, $value{source_line}) = $source =~ m/\/([^\/]+):([0-9]+)$/o;
%{$symbols{section}{$section}{by_name}{$symbol}} = %value;
%{$symbols{section}{$section}{by_address}{hex($address)}} = %value;
}
close($fd);
my($sections_entry, $previous_address, $this_address, $previous, $this, $key);
for $section (sort(keys(%{$symbols{section}})))
{
undef($previous_address);
if(!exists($sections{$section}))
{
printf("section %s is unknown\n", $section);
next;
}
$sections_entry = \%{$sections{$section}};
$$sections_entry{size_1} = 0;
$$sections_entry{size_2} = 0;
for $this_address (sort(keys(%{$symbols{section}{$section}{by_address}})))
{
if(!defined($previous_address))
{
$previous_address = $this_address;
next;
}
$previous = \%{$symbols{section}{$section}{by_address}{$previous_address}};
$this = \%{$symbols{section}{$section}{by_address}{$this_address}};
if(($$this{address} < $$sections_entry{start}) || ($$this{address} > $$sections_entry{end}))
{
printf(" invalid address for symbol %s for section %s: %x\n", $$this{name}, $section, $$this{address});
next;
}
$$previous{size_2} = $$this{address} - $$previous{address};
$$sections_entry{size_1} += $$previous{size_1};
$$sections_entry{size_2} += $$previous{size_2};
$key = sprintf("%-10s:%4x:%s", $section, $$previous{size_2}, $$previous{address});
%{$symbols{section}{$section}{by_size}{$key}} = %{$previous};
$previous_address = $this_address;
}
$$this{size_2} = $$this{size_1};
$$sections_entry{size_1} += $$this{size_1};
$$sections_entry{size_2} += $$this{size_1};
$key = sprintf("%-10s:%4x:%s", $section, $$this{size_2}, $$this{address});
%{$symbols{section}{$section}{by_size}{$key}} = %{$this};
}
my(%section_to_region) =
(
"bss" => "dram",
"data" => "dram",
"rodata" => "dram",
"text" => "iram",
"irom0.text" => "flash",
);
my($region, %region);
printf("sections\n");
for $section (qw[bss data rodata text irom0.text])
{
$region = $section_to_region{$section};
printf(" %-10s used: %6d region: %s\n",
$section,
$sections{$section}{size_2},
$region);
$region{$region}{name} = $region;
$region{$region}{start} = $sections{$section}{start};
$region{$region}{end} = $sections{$section}{end};
$region{$region}{size} += $sections{$section}{size_2};
}
printf("\nregions\n");
my($length);
for $region (qw[dram iram flash])
{
$length = $region{$region}{end} - $region{$region}{start};
$free = $length - $region{$region}{size};
printf(" %-10s start: 0x%8x end: 0x%8x length: %7d used: %6d free: %6d %3d%%\n",
$region,
$region{$region}{start},
$region{$region}{end},
$length,
$region{$region}{size},
$free,
($free * 100) / $length,
);
}
printf("\nsymbols\n");
my($name, $section2, $source_line, $source_file);
printf(" %-10s %-6s %-14s %-8s %-5s %-5s %-44s %-4s %s\n", "section", "region", "class", "address", "size1", "size2", "name", "line", "file");
for $section (qw[bss data rodata text irom0.text])
{
$region = $section_to_region{$section};
for $key (sort(keys(%{$symbols{section}{$section}{by_size}})))
{
($section2, $size, $address) = $key =~ m/^([^\s]+)\s*:\s*([0-9a-f]+)\s*:(.*)/o;
$this = \%{$symbols{section}{$section}{by_address}{$address}};
$source_line = $$this{source_line};
$source_file = $$this{source_file};
$source_file = "" if(!defined($source_file));
if(!defined($source_line))
{
$source_line = "";
}
else
{
$source_line = sprintf("%4s", $source_line);
}
printf(" %-10s %-6s %-14s %08x %5d %5d %-44s %-4s %s\n", $section2, $region, $class_to_text{$$this{class}}, $address, $$this{size_1}, $$this{size_2},
$$this{name}, $source_line, $source_file);
}
}
Posted: Thu Mar 21, 2019 7:36 pm