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Inline GDB scripts in the PHP binary (#13600)

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This inlines .gdbinit and php_gdb.py in the .debug_gdb_scripts section of the PHP binary so that GDB can auto-load them regardless of the current directory or the availability of the PHP source code (albeit some functionalities of php_gdb.py currently rely on the source being available).
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Arnaud Le Blanc 2024-04-16 15:10:01 +02:00 • committed by GitHub
parent af5db45dc9
commit 46b6ad6dae
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6 changed files with 1091 additions and 2 deletions
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53
scripts/gdb/debug_gdb_scripts_gen.php Executable file
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#!/usr/bin/env php
<?php
$rootDir = dirname(__DIR__, 2);
$mainDir = sprintf('%s/main', $rootDir);
$outputFile = sprintf('%s/debug_gdb_scripts.c', $mainDir);
printf("Generating %s\n", $outputFile);
$gdbscript = file_get_contents(sprintf("%s/.gdbinit", $rootDir));
$pyscript = file_get_contents(sprintf("%s/php_gdb.py", __DIR__));
// We can not inline .gdbinit, but we can embed it in the python script.
$pyscript = sprintf(
"gdb.execute('''\n%s\n''')\n%s",
addcslashes($gdbscript, '\'\\'),
$pyscript,
);
$ccode = sprintf(
<<<'C'
/*
* Generated by %s.
*
* This inlines .gdbinit and php_gdb.py into the .debug_gdb_scripts
* section of the binary, so that they can be found by gdb.
*
* See https://sourceware.org/gdb/current/onlinedocs/gdb.html/dotdebug_005fgdb_005fscripts-section.html#dotdebug_005fgdb_005fscripts-section
*/
asm(
".pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n"
".byte 4 /* Python Text */\n"
".ascii \"gdb.inlined-script\\n\"\n"
%s
".byte 0\n"
".popsection\n"
);
C,
basename(__FILE__),
implode("\n ", array_map(function ($line) {
$escapedPy = addcslashes($line."\n", "\"\n\\");
$escapedAsm = addcslashes(sprintf(".ascii \"%s\"\n", $escapedPy), "\"\n\\");
return sprintf('"%s"', $escapedAsm);
}, explode("\n", $pyscript))),
);
$len = file_put_contents($outputFile, $ccode);
if ($len !== strlen($ccode)) {
printf("Failed\n");
exit(1);
}