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Allow to fetch function address

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This commit is contained in:
Dmitry Stogov 2020-03-12 11:40:48 +03:00
commit ecdaf83f5f
2 changed files with 78 additions and 1 deletions
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20
ext/ffi/ffi.c
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@ -2355,7 +2355,7 @@ static zval *zend_ffi_read_var(zval *object, zval *member, int read_type, void *
if (ffi->symbols) {
sym = zend_hash_find_ptr(ffi->symbols, var_name);
if (sym && sym->kind != ZEND_FFI_SYM_VAR && sym->kind != ZEND_FFI_SYM_CONST) {
if (sym && sym->kind != ZEND_FFI_SYM_VAR && sym->kind != ZEND_FFI_SYM_CONST && sym->kind != ZEND_FFI_SYM_FUNC) {
sym = NULL;
}
}
@ -2369,6 +2369,24 @@ static zval *zend_ffi_read_var(zval *object, zval *member, int read_type, void *
if (sym->kind == ZEND_FFI_SYM_VAR) {
zend_ffi_cdata_to_zval(NULL, sym->addr, ZEND_FFI_TYPE(sym->type), read_type, rv, (zend_ffi_flags)sym->is_const, 0);
} else if (sym->kind == ZEND_FFI_SYM_FUNC) {
zend_ffi_cdata *cdata;
zend_ffi_type *new_type = emalloc(sizeof(zend_ffi_type));
new_type->kind = ZEND_FFI_TYPE_POINTER;
new_type->attr = 0;
new_type->size = sizeof(void*);
new_type->align = _Alignof(void*);
new_type->pointer.type = ZEND_FFI_TYPE(sym->type);
cdata = emalloc(sizeof(zend_ffi_cdata));
zend_ffi_object_init(&cdata->std, zend_ffi_cdata_ce);
cdata->std.handlers = &zend_ffi_cdata_handlers;
cdata->type = ZEND_FFI_TYPE_MAKE_OWNED(new_type);
cdata->flags = ZEND_FFI_FLAG_CONST;
cdata->ptr_holder = sym->addr;
cdata->ptr = &cdata->ptr_holder;
ZVAL_OBJ(rv, &cdata->std);
} else {
ZVAL_LONG(rv, sym->value);
}

59
ext/ffi/tests/101.phpt Normal file
View File

@ -0,0 +1,59 @@
--TEST--
FFI 101: PHP symbols (function address)
--SKIPIF--
<?php require_once('skipif.inc'); ?>
<?php
try {
FFI::cdef("extern void *zend_printf;");
} catch (Throwable $e) {
die('skip PHP symbols not available');
}
?>
--INI--
ffi.enable=1
--FILE--
<?php
// Check if target supports "fastcall" calling convention
try {
FFI::cdef("extern size_t __attribute__((fastcall)) (*zend_printf)(const char *format);");
$fastcall = "__attribute__((fastcall)) ";
} catch (Throwable $e) {
$fastcall = "";
}
$zend = FFI::cdef("
const char *get_zend_version(void);
//char *get_zend_version(void);
extern size_t (*zend_printf)(const char *format, ...);
unsigned long $fastcall zend_hash_func(const char *str, size_t len);
void $fastcall zend_str_tolower(char *str, size_t length);
");
$f = $zend->get_zend_version;
var_dump(trim(explode("\n",$f())[0]));
//var_dump(trim(FFI::string($zend->get_zend_version())));
var_dump($zend->zend_printf);
var_dump(($zend->zend_printf)("Hello %s!\n", "World"));
$f = $zend->zend_hash_func;
var_dump($f("file", strlen("file")));
$str = $zend->new("char[16]");
FFI::memcpy($str, "Hello World!", strlen("Hello World!"));
$f = $zend->zend_str_tolower;
$f($str, strlen("Hello World!"));
var_dump(FFI::string($str));
?>
--EXPECTF--
string(%d) "Zend Engine %s"
object(FFI\CData:uint%d_t(*)())#%d (1) {
[0]=>
object(FFI\CData:uint%d_t())#%d (0) {
}
}
Hello World!
int(13)
int(%i)
string(12) "hello world!"