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runkit_functions.c
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runkit_functions.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) 1997-2006 The PHP Group, (c) 2008-2015 Dmitry Zenovich |
| "runkit7" patches (c) 2015-2020 Tyson Andre |
+----------------------------------------------------------------------+
| This source file is subject to the new BSD license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.opensource.org/licenses/BSD-3-Clause |
| or at https://github.com/runkit7/runkit7/blob/master/LICENSE |
+----------------------------------------------------------------------+
| Author: Sara Golemon <pollita@php.net> |
| Modified by Dmitry Zenovich <dzenovich@gmail.com> |
| Modified for php7 by Tyson Andre <tysonandre775@hotmail.com> |
+----------------------------------------------------------------------+
*/
#include "runkit.h"
#include "php_runkit_hash.h"
#include "php_runkit_zend_execute_API.h"
#include "Zend/zend.h"
#if PHP_VERSION_ID >= 80000
#include "Zend/zend_attributes.h"
#endif
#ifdef ZEND_MAP_PTR_GET
#define RUNKIT_RUN_TIME_CACHE(op_array) \
ZEND_MAP_PTR_GET((op_array)->run_time_cache)
#else
#define RUNKIT_RUN_TIME_CACHE(op_array) \
((op_array)->run_time_cache)
#endif
/* {{{ php_runkit7_obtain_internal_function_rid() */
static int php_runkit7_obtain_internal_function_rid() {
// Obtain a reserved slot index that isn't used by any other internal extensions such as performance monitors.
int rid = RUNKIT_G(original_func_resource_handle);
ZEND_ASSERT(rid >= 0);
return rid;
} /* }}} */
// Get lvalue of the aliased user function for a fake internal function.
#define RUNKIT_ALIASED_USER_FUNCTION(fe) ((fe)->internal_function.reserved[php_runkit7_obtain_internal_function_rid()])
#define RUNKIT_IS_ALIAS_FOR_USER_FUNCTION(fe) ((fe)->type == ZEND_INTERNAL_FUNCTION && (fe)->internal_function.handler == php_runkit_function_alias_handler)
extern ZEND_API void zend_vm_set_opcode_handler(zend_op *op);
#ifdef PHP_RUNKIT_MANIPULATION
/* {{{ Top level declarations */
static void php_runkit_function_copy_ctor_same_type(zend_function *fe, zend_string *newname);
/* }}} */
/* {{{ php_runkit_check_call_stack
*/
int php_runkit_check_call_stack(zend_op_array *op_array)
{
zend_execute_data *ptr;
ptr = EG(current_execute_data);
while (ptr) {
// TODO: ???
if (ptr->func && ptr->func->op_array.opcodes == op_array->opcodes) {
return FAILURE;
}
ptr = ptr->prev_execute_data;
}
return SUCCESS;
}
/* }}} */
/* Temporary function name. This function is manipulated with functions in this file. */
#define RUNKIT_TEMP_FUNCNAME "__runkit_temporary_function__"
/* Temporary class name. A function in this class is manipulated with functions in this file. */
#define RUNKIT_TEMP_CLASSNAME "__runkit_temporary_class__"
/* Temporary method name. A function in this class is manipulated with functions in this file. */
#define RUNKIT_TEMP_METHODNAME "__runkit_temporary_method__"
/* Maintain order */
#define PHP_RUNKIT_FETCH_FUNCTION_INSPECT 0
#define PHP_RUNKIT_FETCH_FUNCTION_REMOVE 1
#define PHP_RUNKIT_FETCH_FUNCTION_RENAME 2
/* {{{ php_runkit_fetch_function
*/
static zend_function *php_runkit_fetch_function(zend_string *fname, int flag)
{
zend_function *fe;
zend_string *fname_lower;
fname_lower = zend_string_tolower(fname);
if ((fe = zend_hash_find_ptr(EG(function_table), fname_lower)) == NULL) {
zend_string_release(fname_lower);
php_error_docref(NULL, E_WARNING, "%s() not found", ZSTR_VAL(fname));
return NULL;
}
if (fe->type == ZEND_INTERNAL_FUNCTION &&
!RUNKIT_G(internal_override)) {
zend_string_release(fname_lower);
php_error_docref(NULL, E_WARNING, "%s() is an internal function and runkit.internal_override is disabled", ZSTR_VAL(fname));
return NULL;
}
if (fe->type != ZEND_USER_FUNCTION &&
fe->type != ZEND_INTERNAL_FUNCTION) {
zend_string_release(fname_lower);
php_error_docref(NULL, E_WARNING, "%s() is not a user or normal internal function", ZSTR_VAL(fname));
return NULL;
}
if (fe->type == ZEND_INTERNAL_FUNCTION &&
flag >= PHP_RUNKIT_FETCH_FUNCTION_REMOVE) {
if (!RUNKIT_G(replaced_internal_functions)) {
ALLOC_HASHTABLE(RUNKIT_G(replaced_internal_functions));
zend_hash_init(RUNKIT_G(replaced_internal_functions), 4, NULL, NULL, 0);
}
// FIXME figure out what this is intended to do (Restoring internal functions on request shutdown)
// This is also used to check if a function with a given name was originally internal.
// Cloning this - It would otherwise be deleted with runkit_function_redefine called later... (TODO: Add 1 to the refcount?)
// TODO: Properly specify the behavior to avoid memory leaks
if (!zend_hash_exists(RUNKIT_G(replaced_internal_functions), fname_lower)) {
Bucket *b;
zend_function *fe_copy;
// Copy over the original function - If the original function remains, it will be freed on module shutdown.
zend_string_addref(fe->common.function_name); // possibly unnecessary
fe_copy = php_runkit_function_clone(fe, fe->common.function_name, ZEND_INTERNAL_FUNCTION);
// Copy over the original persistent string - That string wouldn't be destroyed on request shutdown in fpm, and can be reused in future requests?
b = php_runkit_zend_hash_find_bucket(EG(function_table), fname_lower);
// php_error_docref(NULL, E_WARNING, "Finding persistent string %s: %llx\n", ZSTR_VAL(fname_lower), (long long)(uintptr_t)b);
// It's a persistent string, not an interned string? Is it always a persistent string (E.g. in NTS, ZTS, maintainer ZTS)?
if (b->key != NULL) {
zend_string_addref(b->key);
zend_string_release(fname_lower);
fname_lower = b->key;
// php_error_docref(NULL, E_WARNING, "Stealing persistent string %s\n", ZSTR_VAL(fname_lower));
} else {
zend_string_addref(fname_lower);
}
zend_hash_add_ptr(RUNKIT_G(replaced_internal_functions), fname_lower, fe_copy);
}
// printf("Adding fe %llx to replaced_internal_functions key=%s result=%llx\n", (long long)fe, ZSTR_VAL(fname_lower), (long long)result);
/*
* If internal functions have been modified then runkit's request shutdown handler
* should be called after all other modules' ones.
*/
php_runkit_hash_move_runkit_to_front();
EG(full_tables_cleanup) = 1; // dirty hack!
}
zend_string_release(fname_lower);
return fe;
}
/* }}} */
/* {{{ php_runkit_ensure_misplaced_internal_functions_table_exists */
static inline void php_runkit_ensure_misplaced_internal_functions_table_exists()
{
if (!RUNKIT_G(misplaced_internal_functions)) {
ALLOC_HASHTABLE(RUNKIT_G(misplaced_internal_functions));
zend_hash_init(RUNKIT_G(misplaced_internal_functions), 4, NULL, NULL, 0);
}
}
/* }}} */
/* {{{ php_runkit_add_to_misplaced_internal_functions */
static inline void php_runkit_add_to_misplaced_internal_functions(zend_function *fe, zend_string *name_lower)
{
if (fe->type == ZEND_INTERNAL_FUNCTION &&
(!RUNKIT_G(misplaced_internal_functions) ||
!zend_hash_exists(RUNKIT_G(misplaced_internal_functions), name_lower))
) {
zval tmp;
php_runkit_ensure_misplaced_internal_functions_table_exists();
// Add misplaced internal functions to a list of strings, to be wiped out on request shutdown (before restoring originals)
ZVAL_STR(&tmp, name_lower);
zend_string_addref(name_lower); // TODO: Free this in calls to php_runkit_destroy_misplaced_internal_function on shutdown?
zend_hash_next_index_insert(RUNKIT_G(misplaced_internal_functions), &tmp);
}
}
/* }}} */
/* {{{ php_runkit_destroy_misplaced_internal_function */
static inline void php_runkit_destroy_misplaced_internal_function(zend_function *fe, zend_string *fname_lower)
{
if (fe->type == ZEND_INTERNAL_FUNCTION && RUNKIT_G(misplaced_internal_functions) &&
zend_hash_exists(RUNKIT_G(misplaced_internal_functions), fname_lower)) {
// PHP_RUNKIT_FREE_INTERNAL_FUNCTION_NAME would have been called, but function destructor already deletes those?
zend_hash_del(RUNKIT_G(misplaced_internal_functions), fname_lower);
}
}
/* }}} */
#ifdef RT_CONSTANT_EX
/* {{{ php_runkit_set_opcode_constant
for absolute constant addresses (ZEND_USE_ABS_CONST_ADDR), changes op to point to the local copy of that literal.
Modifies op's contents. */
static void php_runkit_set_opcode_constant(const zval *literals, znode_op *op, zval *literalI)
{
debug_printf("php_runkit_set_opcode_constant(%llx, %llx, %d), USE_ABS=%d\n", (long long)literals, (long long)literalI, (int)sizeof(zval), ZEND_USE_ABS_CONST_ADDR);
#if ZEND_USE_ABS_CONST_ADDR
RT_CONSTANT_EX(literals, *op) = literalI;
#else
// TODO: Assert that this is in a meaningful range.
// TODO: is this ever necessary for relative constant addresses?
op->constant = ((char *)literalI) - ((char *)literals);
#endif
}
/* }}} */
#else
/* {{{ php_runkit_set_opcode_constant_relative
for absolute constant addresses, creates a local copy of that literal.
Modifies op's contents. */
static void php_runkit_set_opcode_constant_relative(const zend_op_array *op_array, const zend_op *opline, znode_op *op, zval *literalI)
{
debug_printf("php_runkit_set_opcode_constant_relative(%llx, %d), USE_ABS=%d\n", (long long)literalI, (int)sizeof(zval), ZEND_USE_ABS_CONST_ADDR);
#if ZEND_USE_ABS_CONST_ADDR
RUNKIT_RT_CONSTANT(op_array, opline, *op) = literalI;
#else
debug_printf("opcodes=%llx literals=%llx opline=%llx op=%llx literalI=%llx\n", (long long)op_array->opcodes, (long long)op_array->literals, (long long)opline, (long long)op, (long long)literalI);
// TODO: Assert that this is in a meaningful range.
// TODO: is this ever necessary for relative constant addresses?
// Opposite of ((zval*)(((char*)(opline)) + (int32_t)(node).constant))
op->constant = ((char *)literalI) - ((char *)opline);
#endif
}
/* }}} */
#endif
/* {{{ php_runkit_function_alias_handler
Used when an internal function is replaced by a user-defined/runkit function. Converts the ICALL to a UCALL.
Params: zend_execute_data *execute_data, zval *return_value */
static ZEND_NAMED_FUNCTION(php_runkit_function_alias_handler)
{
zend_function *fbc_inner;
zend_function *fbc = execute_data->func;
int result;
#if ZEND_DEBUG
ZEND_ASSERT(fbc->type == ZEND_INTERNAL_FUNCTION);
#endif
fbc_inner = (zend_function *)RUNKIT_ALIASED_USER_FUNCTION(fbc);
// fprintf(stderr, "Fetched handler %llx from fbc=%llx aliased=%p reserved=%p\n", (long long)(uintptr_t)fbc_inner, (long long)(uintptr_t)fbc, RUNKIT_ALIASED_USER_FUNCTION(fbc), fbc->internal_function.reserved);
#if ZEND_DEBUG
ZEND_ASSERT(fbc_inner->type == ZEND_USER_FUNCTION);
#endif
// printf("In php_runkit_function_alias_handler! fbc=%llx fbc_inner=%llx execute_data=%llx return_value=%llx\n", (long long) fbc, (long long) fbc_inner, (long long)execute_data, (long long)return_value);
// TODO: Pass a context?
// TODO: Copy the implementation of zend_call_function, use it to set up an additional stack entry....
// FIXME modify current_execute_data for stack traces.
// FIXME : 4th param check_this should be 1 if this is a method.
// Fake the stack and call the inner function.
// Set up the execution of the new command.
result = runkit_forward_call_user_function(fbc, fbc_inner, INTERNAL_FUNCTION_PARAM_PASSTHRU);
(void)result;
// printf("In php_runkit_function_alias_handler! execute_data=%llx return_value=%llx, return code = %d\n", (long long)execute_data, (long long)return_value, (int)result);
// TODO: Throw an exception
return;
// FIXME: This is wrong, it did not start executing the command, it only set it up for execution. Try doing something similar to call_user_func_array?
}
/* }}} */
/* {{{ php_runkit_function_create_alias_internal_function */
/** Create a fake internal function which will call the duplicated user function instead. */
static void php_runkit_function_create_alias_internal_function(zend_function *fe, zend_function *fe_inner)
{
// Zero out the parts that will be an internal function.
memset((((uint8_t *)fe) + sizeof(fe->common)), 0, sizeof(zend_function) - sizeof(fe->common));
#if ZEND_DEBUG
ZEND_ASSERT(fe_inner->type == ZEND_USER_FUNCTION);
#endif
// TODO: Figure out refcount tracking of function names when aliases are used.
fe->type = ZEND_INTERNAL_FUNCTION;
fe->common.function_name = fe_inner->common.function_name;
zend_string_addref(fe->common.function_name);
debug_printf("Copying handler to %llx\n", (long long)(uintptr_t)php_runkit_function_alias_handler);
fe->internal_function.handler = php_runkit_function_alias_handler;
RUNKIT_ALIASED_USER_FUNCTION(fe) = fe_inner;
// fprintf(stderr, "Copying handler to %llx for fbc=%llx aliased=%p reserved=%p\n", (long long)(uintptr_t)php_runkit_function_alias_handler, (long long)(uintptr_t)fe, RUNKIT_ALIASED_USER_FUNCTION(fe), fe->internal_function.reserved);
}
/* }}} */
/* {{{ php_runkit_function_copy_ctor
Duplicate structures in a zend_function where necessary to make an outright duplicate.
Does additional work to ensure that the type of the final function is orig_fe_type. */
int php_runkit_function_copy_ctor(zend_function *fe, zend_string *newname, char orig_fe_type)
{
if (fe->type == orig_fe_type) {
php_runkit_function_copy_ctor_same_type(fe, newname);
return SUCCESS;
} else if (orig_fe_type == ZEND_INTERNAL_FUNCTION) { /* We replaced an internal function with a user function. */
zend_function *fe_inner = pemalloc(sizeof(zend_op_array), 1);
memcpy(fe_inner, fe, sizeof(zend_op_array));
php_runkit_function_copy_ctor_same_type(fe_inner, newname);
php_runkit_function_create_alias_internal_function(fe, fe_inner);
// printf("Allocated fe_inner=%llx type=%d\n", (long long)fe_inner, (int)fe_inner->type);
return SUCCESS;
}
php_runkit_function_copy_ctor_same_type(fe, newname);
return SUCCESS;
}
/* }}} */
/* {{{ runkit_allocate_opcode_copy
Allocates a zend_op_array with enough memory to store the opcodes (As well as literals, if required for php 7.3) */
static zend_op *runkit_allocate_opcode_copy(const zend_op_array *const op_array)
{
#if PHP_VERSION_ID >= 70300
// Adjustment for https://github.com/runkit7/runkit7/issues/126
// I assume that PHP's pass_two() from Zend/zend_opcache.c would be done by now
if (!(ZEND_USE_ABS_CONST_ADDR) &&
(op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) &&
op_array->literals) {
// Allocate enough space for op_array->opcode_copy and op_array->last_literal()
size_t bytes_to_allocate = ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
sizeof(zval) * op_array->last_literal;
zend_op *opcode = (zend_op *)emalloc(bytes_to_allocate);
debug_printf("Allocating %d bytes for opcode array last=%d last_literal=%d\n", (int)bytes_to_allocate, (int)op_array->last, (int)op_array->last_literal);
memset(opcode, 0, bytes_to_allocate);
return opcode;
// Skip the memcpy step for the op_array and the literals in php 7.3+
}
#endif
debug_printf("Allocating %d bytes for opcode array without literals\n", (int)(sizeof(zend_op) * op_array->last));
return safe_emalloc(sizeof(zend_op), op_array->last, 0);
}
/* }}} */
/* {{{ runkit_allocate_literals */
static zval *runkit_allocate_literals(const zend_op_array *const op_array, zend_op *opcode_copy)
{
#if PHP_VERSION_ID >= 70300
// Adjustment for https://github.com/runkit7/runkit7/issues/126
// I assume that PHP's pass_two() from Zend/zend_opcode.c would be done by now
if (!(ZEND_USE_ABS_CONST_ADDR) &&
(op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO)) {
// Reuse the extra space allocated for runkit_allocate_opcode_copy
debug_printf("Allocating literals at relative offset %d last=%d\n", (int)(ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16)), (int)op_array->last);
return (zval *)(((char *)opcode_copy) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
}
#else
(void)opcode_copy;
#endif
debug_printf("Allocating literals with emalloc last_literal=%d\n", op_array->last_literal);
return safe_emalloc(op_array->last_literal, sizeof(zval), 0);
}
/* }}} */
/* {{{ php_runkit_arginfo_type_addref
Adds a reference to the type or union type of this argument. See zend_type_release() and destroy_op_array() from Zend/zend_opcode.c */
static void php_runkit_arginfo_type_addref(zend_arg_info *arginfo)
{
#if PHP_VERSION_ID < 80000
if (ZEND_TYPE_IS_CLASS(arginfo->type)) {
// This works as the opposite for both php 7.2 and 7.3 (zend_string_release or zend_string_release_ex
zend_string_addref(ZEND_TYPE_NAME(arginfo->type));
}
#else
zend_type type = arginfo->type;
if (ZEND_TYPE_HAS_LIST(type)) {
zend_type *atomic_type;
zend_type_list *type_list = ZEND_TYPE_LIST(type);
size_t size_in_bytes = ZEND_TYPE_LIST_SIZE(type_list->num_types);
zend_type_list *new_type_list = emalloc(size_in_bytes);
memcpy(new_type_list, type_list, size_in_bytes);
arginfo->type.ptr = new_type_list;
ZEND_TYPE_LIST_FOREACH(type_list, atomic_type) {
if (ZEND_TYPE_HAS_NAME(*atomic_type)) {
zend_string_addref(ZEND_TYPE_NAME(*atomic_type));
}
} ZEND_TYPE_LIST_FOREACH_END();
} else if (ZEND_TYPE_HAS_NAME(type)) {
zend_string_addref(ZEND_TYPE_NAME(type));
}
#endif
}
/* }}} */
/* {{{ php_runkit_function_copy_ctor_same_type
Duplicates structures in an zend_function, creating a function of the same type (user/internal) as the original function
This does the opposite of some parts of destroy_op_array() from Zend/zend_opcode.c
*/
static void php_runkit_function_copy_ctor_same_type(zend_function *fe, zend_string *newname)
{
zval *literals;
void *run_time_cache;
zend_string **dupvars; // Array of zend_string*s
zend_op *last_op;
zend_op *opcode_copy;
zend_op_array *const op_array = &(fe->op_array);
uint32_t i;
if (newname) {
zend_string_addref(newname);
fe->common.function_name = newname;
} else {
zend_string_addref(fe->common.function_name);
// TODO: is this a memory leak?
// fe->common.function_name = fe->common.function_name;
}
if (fe->common.type == ZEND_USER_FUNCTION) {
if (op_array->vars) {
i = op_array->last_var;
dupvars = safe_emalloc(op_array->last_var, sizeof(zend_string *), 0);
while (i > 0) {
i--;
dupvars[i] = op_array->vars[i];
zend_string_addref(dupvars[i]);
}
op_array->vars = dupvars;
}
// TODO: Remove ZEND_ACC_IMMUTABLE from func.common.fn_flags, like php 7.4?
// TODO: Look into other php 7.4 changes required for d57cd36e47b627dee5b825760163f8e62e23ab28
if (op_array->static_variables) {
// Similar to zend_closures.c's zend_create_closure copying static variables, zend_compile.c's do_bind_function
// TODO: Does that work with references?
// 979: This seems to be calling an internal function returning a reference, then crashing?
// ZEND_ASSERT((call->func->common.fn_flags & ZEND_ACC_RETURN_REFERENCE)
// ? Z_ISREF_P(ret) : !Z_ISREF_P(ret));
op_array->static_variables = zend_array_dup(op_array->static_variables);
#if PHP_VERSION_ID >= 70400
#if PHP_VERSION_ID >= 80200
/* zend_shutdown_executor_values frees static_variables, destroy_op_array frees static_variables_ptr */
HashTable *ht_dup = zend_array_dup(op_array->static_variables);
ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, ht_dup);
#else
ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, &(op_array->static_variables));
#endif
#endif
}
if (RUNKIT_RUN_TIME_CACHE(op_array)) {
// TODO: Garbage collect these, somehow?
run_time_cache = pemalloc(op_array->cache_size, 1);
memset(run_time_cache, 0, op_array->cache_size);
#ifdef ZEND_MAP_PTR_SET
ZEND_MAP_PTR_SET(op_array->run_time_cache, run_time_cache);
#else
op_array->run_time_cache = run_time_cache;
#endif
}
opcode_copy = runkit_allocate_opcode_copy(op_array);
last_op = op_array->opcodes + op_array->last;
// TODO: See if this code works on 32-bit PHP.
for (i = 0; i < op_array->last; i++) {
opcode_copy[i] = op_array->opcodes[i];
debug_printf("opcode = %s, is_const=%d, constant=%d\n", zend_get_opcode_name((int)opcode_copy[i].opcode), (int)(opcode_copy[i].op1_type == IS_CONST), op_array->opcodes[i].op1.constant);
if (opcode_copy[i].op1_type != IS_CONST) {
// TODO: What about switch statements in php 7.2, etc?
zend_op *opline;
zend_op *jmp_addr_op1;
switch (opcode_copy[i].opcode) {
#ifdef ZEND_GOTO
case ZEND_GOTO:
#endif
#ifdef ZEND_FAST_CALL
case ZEND_FAST_CALL:
#endif
case ZEND_JMP:
opline = &opcode_copy[i];
jmp_addr_op1 = OP_JMP_ADDR(opline, opline->op1);
// TODO: I don't know if this is really the same as jmp_addr. FIXME
if (jmp_addr_op1 >= op_array->opcodes &&
jmp_addr_op1 < last_op) {
#if ZEND_USE_ABS_JMP_ADDR
opline->op1.jmp_addr = opcode_copy + (op_array->opcodes[i].op1.jmp_addr - op_array->opcodes);
#else
opline->op1.jmp_offset += ((char *)op_array->opcodes) - ((char *)opcode_copy);
#endif
}
}
}
if (opcode_copy[i].op2_type != IS_CONST) {
zend_op *opline;
zend_op *jmp_addr_op2;
switch (opcode_copy[i].opcode) {
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
#ifdef ZEND_JMP_SET
case ZEND_JMP_SET:
#endif
#ifdef ZEND_JMP_SET_VAR
case ZEND_JMP_SET_VAR:
#endif
opline = &opcode_copy[i];
jmp_addr_op2 = OP_JMP_ADDR(opline, opline->op2);
// TODO: I don't know if this is really the same as jmp_addr. FIXME
if (jmp_addr_op2 >= op_array->opcodes &&
jmp_addr_op2 < last_op) {
#if ZEND_USE_ABS_JMP_ADDR
opline->op2.jmp_addr = opcode_copy + (op_array->opcodes[i].op2.jmp_addr - op_array->opcodes);
#else
opline->op2.jmp_offset += ((char *)op_array->opcodes) - ((char *)opcode_copy);
#endif
}
}
}
}
debug_printf("op_array.literals = %llx, last_literal = %d\n", (long long)op_array->literals, op_array->last_literal);
if (op_array->literals) {
uint32_t k;
debug_printf(" old op_array.literals = %llx, opcodes=%llx\n", (long long)op_array->literals, (long long)op_array->opcodes);
literals = runkit_allocate_literals(op_array, opcode_copy);
debug_printf("copied op_array.literals = %llx, opcodes=%llx\n", (long long)literals, (long long)opcode_copy);
for (i = op_array->last_literal; i > 0; ) {
i--;
// This code copies the zvals from the original function's op array to the new function's op array.
// TODO: Re-examine this line to see if reference counting was done properly.
// TODO: fix all of the other places old types of copies were used.
literals[i] = op_array->literals[i];
Z_TRY_ADDREF(literals[i]);
debug_printf("Copying literal of type %d\n", (int)Z_TYPE(literals[i]));
}
for (k = 0; k < op_array->last; k++) {
zend_op *const new_op = &opcode_copy[k];
zend_bool found_op1 = 0;
zend_bool found_op2 = 0;
debug_printf("%d(%s)\ttype=%d %d\n", k, zend_get_opcode_name(new_op->opcode), (int)new_op->op1_type, (int)new_op->op2_type);
for (i = op_array->last_literal; i > 0; ) {
i--;
// TODO: This may be completely unnecessary on 64-bit systems. This may be broken on 32-bit systems.
#ifdef RT_CONSTANT_EX
if (!found_op1 && new_op->op1_type == IS_CONST && RT_CONSTANT_EX(literals, new_op->op1) == &op_array->literals[i]) {
debug_printf("old op1 constant #%d = %d\n", (int)k, new_op->op1.constant);
php_runkit_set_opcode_constant(literals, &(new_op->op1), &literals[i]);
debug_printf("new op1 constant #%d = %d\n", (int)k, new_op->op1.constant);
found_op1 = 1;
}
if (!found_op2 && new_op->op2_type == IS_CONST && RT_CONSTANT_EX(literals, new_op->op2) == &op_array->literals[i]) {
debug_printf("old op2 constant #%d = %d\n", (int)k, new_op->op2.constant);
php_runkit_set_opcode_constant(literals, &(new_op->op2), &literals[i]);
debug_printf("new op2 constant #%d = %d\n", (int)k, new_op->op2.constant);
found_op2 = 1;
}
#else
// e.g. this is used on 64-bit builds of PHP.
// The start of the literals zval array is memory aligned so the relative addressing may be different when copied.
if (!found_op1 && new_op->op1_type == IS_CONST && RUNKIT_RT_CONSTANT(op_array, &op_array->opcodes[k], new_op->op1) == &op_array->literals[i]) {
debug_printf("old op1 constant #%d = %d (v2)\n", (int)k, new_op->op1.constant);
php_runkit_set_opcode_constant_relative(op_array, new_op, &(new_op->op1), &literals[i]);
debug_printf("new op1 constant #%d = %d (v2)\n", (int)k, new_op->op1.constant);
found_op1 = 1;
}
if (!found_op2 && new_op->op2_type == IS_CONST && RUNKIT_RT_CONSTANT(op_array, &op_array->opcodes[k], new_op->op2) == &op_array->literals[i]) {
debug_printf("old op2 constant #%d = %d (v2)\n", (int)k, new_op->op2.constant);
php_runkit_set_opcode_constant_relative(op_array, new_op, &(new_op->op2), &literals[i]);
debug_printf("new op2 constant #%d = %d (v2)\n", (int)k, new_op->op2.constant);
found_op2 = 1;
}
#endif
}
}
op_array->literals = literals;
}
op_array->opcodes = opcode_copy;
op_array->refcount = (uint32_t *)emalloc(sizeof(uint32_t));
*op_array->refcount = 1;
if (op_array->doc_comment) {
zend_string_addref(op_array->doc_comment);
}
if (op_array->filename) {
zend_string_addref(op_array->filename);
}
op_array->try_catch_array = (zend_try_catch_element *)estrndup((char *)op_array->try_catch_array, sizeof(zend_try_catch_element) * op_array->last_try_catch);
if (op_array->live_range) {
op_array->live_range = (zend_live_range *)estrndup((char *)op_array->live_range, sizeof(zend_live_range) * op_array->last_live_range);
}
/* TODO: Is the copying of arg info correct when copying internal arginfo to/from user-defined arg info? The offset for internal functions is always -1. */
if (op_array->arg_info) {
zend_arg_info *tmpArginfo;
zend_arg_info *originalArginfo;
// NOTE: This is the offset calculation for a user-defined function.
// num_args calculation taken from zend_opcode.c destroy_op_array
//
// TODO: Add tests that functions with return types are properly created and destroyed.
// TODO: Specify what runkit should do about return types, what is an error, what is valid.
uint32_t num_args = op_array->num_args;
int32_t offset = 0;
if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
offset++;
num_args++;
}
if (op_array->fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
tmpArginfo = (zend_arg_info *)safe_emalloc(sizeof(zend_arg_info), num_args, 0);
originalArginfo = &((op_array->arg_info)[-offset]);
for (i = 0; i < num_args; i++) {
tmpArginfo[i] = originalArginfo[i];
if (tmpArginfo[i].name) {
zend_string_addref((tmpArginfo[i].name));
}
php_runkit_arginfo_type_addref(&tmpArginfo[i]);
}
op_array->arg_info = &tmpArginfo[offset];
}
} else {
/* This is an internal class */
#if PHP_VERSION_ID >= 80000
if ((op_array->fn_flags & (ZEND_ACC_HAS_RETURN_TYPE|ZEND_ACC_HAS_TYPE_HINTS)) &&
op_array->arg_info) {
zend_arg_info *tmpArginfo;
zend_arg_info *originalArginfo;
// num_args calculation taken from zend_opcode.c free_internal_arg_info
// TODO: Add tests that functions with return types are properly created and destroyed.
// TODO: Specify what runkit should do about return types, what is an error, what is valid.
uint32_t num_args = op_array->num_args + 1;
const int32_t offset = 1;
if (op_array->fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
tmpArginfo = pemalloc(sizeof(zend_arg_info) * num_args, 1);
originalArginfo = &((op_array->arg_info)[-offset]);
for (i = 0; i < num_args; i++) {
tmpArginfo[i] = originalArginfo[i];
/*
if (tmpArginfo[i].name) {
zend_string_addref((tmpArginfo[i].name));
}
*/
php_runkit_arginfo_type_addref(&tmpArginfo[i]);
}
op_array->arg_info = &tmpArginfo[offset];
} else {
op_array->arg_info = NULL;
}
#endif
}
// I'm not sure why this was originally added in upstream -- Removing this isn't causing test failures in php 7.
// NOTE: If this line is uncommented, then PHP 7.3 would fail during cleanup of op arrays,
// because Zend's function destructor expects functions that didn't complete pass two to have a separate allocated array for literals.
// fe->common.fn_flags &= ~ZEND_ACC_DONE_PASS_TWO;
fe->common.prototype = fe;
}
/* }}} */
/* {{{ php_runkit_function_clone
Makes a duplicate of fe that doesn't share any static variables, zvals, etc.
TODO: Is there anything I can use from zend_duplicate_function? */
zend_function *php_runkit_function_clone(zend_function *fe, zend_string *newname, char orig_fe_type)
{
// Make a persistent allocation.
// TODO: Clean it up after a request?
zend_function *new_function = pemalloc(sizeof(zend_function), 1);
if (fe->type == ZEND_INTERNAL_FUNCTION) {
memset(new_function, 0, sizeof(zend_function));
memcpy(new_function, fe, sizeof(zend_internal_function));
} else {
memcpy(new_function, fe, sizeof(zend_function));
}
php_runkit_function_copy_ctor(new_function, newname, orig_fe_type);
return new_function;
}
/* }}} */
void php_runkit_free_inner_if_aliased_function(zend_function *fe)
{
if (RUNKIT_IS_ALIAS_FOR_USER_FUNCTION(fe)) {
zval zv_inner;
zend_function *fe_inner;
fe_inner = (zend_function *)RUNKIT_ALIASED_USER_FUNCTION(fe);
// TODO: Free these earlier if possible.
debug_printf("Freeing internal function %llx of %llx: %s\n", (long long)(uintptr_t)(fe_inner), (long long)(uintptr_t)fe, (char *)ZSTR_VAL(fe_inner->common.function_name));
#if ZEND_DEBUG
ZEND_ASSERT(fe_inner->type == ZEND_USER_FUNCTION);
#endif
ZVAL_FUNC(&zv_inner, fe_inner);
zend_function_dtor(&zv_inner);
pefree(fe_inner, 1);
}
}
/* {{{ php_runkit_function_dtor_impl - Destroys functions, handles special fields added if they're from runkit. */
void php_runkit_function_dtor_impl(zend_function *fe, zend_bool is_clone)
{
zval zv;
zend_bool is_user_function;
is_user_function = fe->type == ZEND_USER_FUNCTION;
php_runkit_free_inner_if_aliased_function(fe);
ZVAL_FUNC(&zv, fe);
zend_function_dtor(&zv);
// Note: This can only be used with zend_functions created by php_runkit_function_clone.
// ZEND_INTERNAL_FUNCTIONs are freed.
if (is_clone && is_user_function) {
pefree(fe, 1);
}
}
/* }}} */
/* {{{ php_runkit_function_dtor - Only to be used if we are sure this was created by runkit with runkit_function_clone. */
void php_runkit_function_dtor(zend_function *fe)
{
php_runkit_function_dtor_impl(fe, 1);
}
/* }}} */
// The original destructor of the affected function_table.
static dtor_func_t __function_table_orig_pDestructor = NULL;
static void php_runkit_function_table_dtor(zval *pDest)
{
zend_function *fe = (zend_function *)Z_PTR_P(pDest);
if (RUNKIT_IS_ALIAS_FOR_USER_FUNCTION(fe)) {
php_runkit_free_inner_if_aliased_function(fe);
} else {
// Don't free the inner if it's one of the ZEND_INTERNAL_FUNCTIONs moved elsewhere
if (fe->type != ZEND_INTERNAL_FUNCTION && __function_table_orig_pDestructor != NULL) {
__function_table_orig_pDestructor(pDest);
}
}
}
/* {{{ php_runkit_function_create_clone_alias_user_function - Create a user function aliasing an internal function */
static zend_function *php_runkit_function_create_clone_alias_user_function(zend_function *sfe)
{
#if ZEND_DEBUG
ZEND_ASSERT(sfe->type == ZEND_INTERNAL_FUNCTION);
#endif
/*
// FIXME support making user functions that are aliases of internal functions and callable.
// Currently, we just leave them as the original internal function.
if (1) {
zend_function *fe;
fe = emalloc(sizeof(zend_op_array), 1);
memcpy(fe, sfe, sizeof(sfe->common)); // Copy the common parts of internal function to the user function
memset((((uint8_t*) fe) + sizeof(fe->common)), 0, sizeof(zend_op) - sizeof(fe->common));
fe->op_array.refcount = (uint32_t*)emalloc(sizeof(uint32_t));
*(fe->op_array.refcount) = 1;
// TODO: initialize op_array.opcodes with the desired operations.
fe->reserved[0] = sfe;
return fe;
}
*/
return sfe;
}
/* }}} */
/* {{{ php_runkit_remove_from_function_table - This handles special cases where we associate aliased functions with the original */
int php_runkit_remove_from_function_table(HashTable *function_table, zend_string *func_lower)
{
// To be called for internal functions (TODO: internal methods?)
// TODO: Have a way to detect function clones.
int result;
__function_table_orig_pDestructor = function_table->pDestructor;
function_table->pDestructor = php_runkit_function_table_dtor;
result = zend_hash_del(function_table, func_lower);
function_table->pDestructor = __function_table_orig_pDestructor;
__function_table_orig_pDestructor = NULL;
return result;
}
/* }}} */
/* {{{ php_runkit_update_ptr_in_function_table - This handles special cases where we associate aliased functions with the original, and then replace that with zend_hash_update */
void *php_runkit_update_ptr_in_function_table(HashTable *function_table, zend_string *func_lower, zend_function *f)
{
// To be called for internal functions (TODO: internal methods?)
// TODO: Have a way to detect function clones.
void *result;
__function_table_orig_pDestructor = function_table->pDestructor;
function_table->pDestructor = php_runkit_function_table_dtor;
result = zend_hash_update_ptr(function_table, func_lower, f);
function_table->pDestructor = __function_table_orig_pDestructor;
__function_table_orig_pDestructor = NULL;
return result;
}
/* }}} */
/* {{{ runkit_zend_hash_add_or_update_function_table_ptr */
static inline void *runkit_zend_hash_add_or_update_function_table_ptr(HashTable *function_table, zend_string *key, void *pData, uint32_t flag)
{
void *result;
__function_table_orig_pDestructor = function_table->pDestructor;
function_table->pDestructor = php_runkit_function_table_dtor;
result = runkit_zend_hash_add_or_update_ptr(function_table, key, pData, flag);
function_table->pDestructor = __function_table_orig_pDestructor;
__function_table_orig_pDestructor = NULL;
return result;
}
/* }}} */
/* {{{ php_runkit_clear_function_runtime_cache */
static void php_runkit_clear_function_runtime_cache(zend_function *f)
{
zend_op_array *op_array;
if (f->type != ZEND_USER_FUNCTION) {
return;
}
op_array = &(f->op_array);
if (op_array->cache_size == 0 || RUNKIT_RUN_TIME_CACHE(op_array) == NULL) {
return;
}
// TODO: Does memset do what I want it to do?
memset(RUNKIT_RUN_TIME_CACHE(op_array), 0, op_array->cache_size);
}
/* }}} */
/* {{{ php_runkit_clear_function_runtime_cache_for_function_table */
static void php_runkit_clear_function_runtime_cache_for_function_table(HashTable *function_table) {
zend_function* f;
ZEND_HASH_FOREACH_PTR(function_table, f) {
php_runkit_clear_function_runtime_cache(f);
} ZEND_HASH_FOREACH_END();
}
/* }}} */
/* {{{ php_runkit_clear_all_functions_runtime_cache */
void php_runkit_clear_all_functions_runtime_cache()
{
uint32_t i;
zend_execute_data *ptr;
zend_class_entry *ce;
php_runkit_clear_function_runtime_cache_for_function_table(EG(function_table));
ZEND_HASH_FOREACH_PTR(EG(class_table), ce) {
php_runkit_clear_function_runtime_cache_for_function_table(&(ce->function_table));
} ZEND_HASH_FOREACH_END();
// TODO: Does this make sense, does it work with a runtime cache?
for (ptr = EG(current_execute_data); ptr != NULL; ptr = ptr->prev_execute_data) {
// TODO: I assume that ptr->run_time_cache is the same pointer, if set?
if (ptr->func == NULL || ptr->func->type == ZEND_INTERNAL_FUNCTION || ptr->func->op_array.cache_size == 0 || RUNKIT_RUN_TIME_CACHE(&(ptr->func->op_array)) == NULL) {
continue;
}
memset(RUNKIT_RUN_TIME_CACHE(&(ptr->func->op_array)), 0, ptr->func->op_array.cache_size);
}
PHP_RUNKIT_ITERATE_THROUGH_OBJECTS_STORE_BEGIN(i)
if (object->ce == zend_ce_closure) {
zend_closure *cl = (zend_closure *)object;
php_runkit_clear_function_runtime_cache(&cl->func);
}
PHP_RUNKIT_ITERATE_THROUGH_OBJECTS_STORE_END
}
/* }}} */
/* {{{ php_runkit_fix_hardcoded_stack_sizes */
static inline void php_runkit_fix_hardcoded_stack_sizes(zend_function *f, zend_string *called_name_lower, zend_function *called_f)
{
// called_name_lower is the lowercase function name.
// f is a function which may or may not call called_name_lower, and may or may not have already been fixed.
// TODO: Make this work with namespaced function names
// TODO: Do method names also need to be fixed?
// TODO: Do I only need to worry about user function calls within the same file?
// FIXME work on namespaced functions
zend_op_array *op_array;
zend_op *opline_it;
zend_op *end;
if (f == NULL || f->type != ZEND_USER_FUNCTION) {
return;
}
op_array = &(f->op_array);
opline_it = op_array->opcodes;
end = opline_it + op_array->last;
//printf("Calling php_runkit_fix_hardcoded_stack_sizes for user func last=%d\n", op_array->last);
for (; opline_it < end; opline_it++) {
// printf("Calling opcode=%d\n", opline_it->opcode);
// PHP uses different constants (More constant space needed for ZEND_INIT_FCALL_BY_NAME),
// instead of converting to ZEND_INIT_FCALL_BY_NAME, recalculate the maximum amount of stack space opline_it may need.
if (opline_it->opcode == ZEND_INIT_FCALL) {
zval *function_name = (zval *)(RUNKIT_RT_CONSTANT(op_array, opline_it, opline_it->op2));
//printf("Checking init_fcall, function name = %s\n", ZSTR_VAL(Z_STR_P(function_name)));
if (zend_string_equals(Z_STR_P(function_name), called_name_lower)) {
// Modify that opline with the recalculated required stack size
uint32_t new_size = zend_vm_calc_used_stack(opline_it->extended_value, called_f);
if (new_size > opline_it->op1.num) {
opline_it->op1.num = new_size;
}
}
}
}
}
/* }}} */
/* {{{ php_runkit_fix_hardcoded_stack_sizes_for_function_table */
static void php_runkit_fix_hardcoded_stack_sizes_for_function_table(HashTable *function_table, zend_string *called_name_lower, zend_function *called_f)
{
zend_function *f;
ZEND_HASH_FOREACH_PTR(function_table, f) {
php_runkit_fix_hardcoded_stack_sizes(f, called_name_lower, called_f);
} ZEND_HASH_FOREACH_END();
}
/* }}} */
/* {{{ php_runkit_fix_hardcoded_stack_sizes */
void php_runkit_fix_all_hardcoded_stack_sizes(zend_string *called_name_lower, zend_function *called_f)
{
uint32_t i;
zend_class_entry *ce;
zend_execute_data *ptr;
php_runkit_fix_hardcoded_stack_sizes_for_function_table(EG(function_table), called_name_lower, called_f);
ZEND_HASH_FOREACH_PTR(EG(class_table), ce) {
php_runkit_fix_hardcoded_stack_sizes_for_function_table(&(ce->function_table), called_name_lower, called_f);
} ZEND_HASH_FOREACH_END();
// This is also needed to get the top-level {main} script, which isn't in the function table
// FIXME what about other scripts that are include()ed
for (ptr = EG(current_execute_data); ptr != NULL; ptr = ptr->prev_execute_data) {
// TODO: I assume that ptr->run_time_cache is the same pointer, if set?
if (ptr->func == NULL || ptr->func->type != ZEND_USER_FUNCTION) {
continue;
}
php_runkit_fix_hardcoded_stack_sizes(ptr->func, called_name_lower, called_f);
}
PHP_RUNKIT_ITERATE_THROUGH_OBJECTS_STORE_BEGIN(i)
if (object->ce == zend_ce_closure) {
zend_closure *cl = (zend_closure *)object;
php_runkit_fix_hardcoded_stack_sizes(&cl->func, called_name_lower, called_f);
}
PHP_RUNKIT_ITERATE_THROUGH_OBJECTS_STORE_END
}
/* }}} */
/* {{{ php_runkit_reflection_update_property */
static void php_runkit_reflection_update_property(zend_object *object, const char *name, zval *value)
{
// Copied from ext/reflection's reflection_update_property
#if PHP_VERSION_ID >= 80000
zend_string *name_string = zend_string_init(name, strlen(name), 0);
zend_std_write_property(object, name_string, value, NULL);
zend_string_release(name_string);
#else
zval obj;
zval member;
ZVAL_OBJ(&obj, object);
ZVAL_STRING(&member, name);
zend_std_write_property(&obj, &member, value, NULL);
zval_ptr_dtor(&member);
#endif
if (Z_REFCOUNTED_P(value)) {
Z_DELREF_P(value);
}
}
/* }}} */
/* {{{ php_runkit_update_reflection_object_name */
void php_runkit_update_reflection_object_name(zend_object *object, int handle, const char *name)
{
zval prop_value;
ZVAL_STRING(&prop_value, name);
php_runkit_reflection_update_property(object, RUNKIT_G(name_str), &prop_value);
}
/* }}} */
/* {{{ php_runkit_free_reflection_function */
static void php_runkit_free_reflection_function(zend_function *fptr)
{
// Exact copy of ext/reflection's _free_function
if (fptr && (fptr->internal_function.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE)) {
zend_string_release(fptr->internal_function.function_name);
zend_free_trampoline(fptr);
}
}
/* }}} */
/* {{{ reflection_object_from_obj
Copied from ext/reflection/php_reflection.c */
static inline reflection_object *reflection_object_from_obj(zend_object *obj)
{
return (reflection_object *)((char *)(obj)-XtOffsetOf(reflection_object, zo));
}
/* }}} */
/* {{{ php_runkit_delete_reflection_function_ptr
Frees the parts of a reflection object referring to the removed method/function(/parameter?) */
static void php_runkit_delete_reflection_function_ptr(reflection_object *intern)
{
// Copied from ext/reflection's reflection_free_objects_storage
parameter_reference *reference;