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zend_ast.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend 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.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Bob Weinand <bwoebi@php.net> |
| Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#include "zend_ast.h"
#include "zend_API.h"
#include "zend_operators.h"
#include "zend_language_parser.h"
#include "zend_smart_str.h"
#include "zend_exceptions.h"
#include "zend_constants.h"
#include "zend_enum.h"
ZEND_API zend_ast_process_t zend_ast_process = NULL;
static inline void *zend_ast_alloc(size_t size) {
return zend_arena_alloc(&CG(ast_arena), size);
}
static inline void *zend_ast_realloc(void *old, size_t old_size, size_t new_size) {
void *new = zend_ast_alloc(new_size);
memcpy(new, old, old_size);
return new;
}
static inline size_t zend_ast_size(uint32_t children) {
return sizeof(zend_ast) - sizeof(zend_ast *) + sizeof(zend_ast *) * children;
}
static inline size_t zend_ast_list_size(uint32_t children) {
return sizeof(zend_ast_list) - sizeof(zend_ast *) + sizeof(zend_ast *) * children;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_znode(znode *node) {
zend_ast_znode *ast;
ast = zend_ast_alloc(sizeof(zend_ast_znode));
ast->kind = ZEND_AST_ZNODE;
ast->attr = 0;
ast->lineno = CG(zend_lineno);
ast->node = *node;
return (zend_ast *) ast;
}
static zend_always_inline zend_ast * zend_ast_create_zval_int(zval *zv, uint32_t attr, uint32_t lineno) {
zend_ast_zval *ast;
ast = zend_ast_alloc(sizeof(zend_ast_zval));
ast->kind = ZEND_AST_ZVAL;
ast->attr = attr;
ZVAL_COPY_VALUE(&ast->val, zv);
Z_LINENO(ast->val) = lineno;
return (zend_ast *) ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_zval_with_lineno(zval *zv, uint32_t lineno) {
return zend_ast_create_zval_int(zv, 0, lineno);
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_zval_ex(zval *zv, zend_ast_attr attr) {
return zend_ast_create_zval_int(zv, attr, CG(zend_lineno));
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_zval(zval *zv) {
return zend_ast_create_zval_int(zv, 0, CG(zend_lineno));
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_zval_from_str(zend_string *str) {
zval zv;
ZVAL_STR(&zv, str);
return zend_ast_create_zval_int(&zv, 0, CG(zend_lineno));
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_zval_from_long(zend_long lval) {
zval zv;
ZVAL_LONG(&zv, lval);
return zend_ast_create_zval_int(&zv, 0, CG(zend_lineno));
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_constant(zend_string *name, zend_ast_attr attr) {
zend_ast_zval *ast;
ast = zend_ast_alloc(sizeof(zend_ast_zval));
ast->kind = ZEND_AST_CONSTANT;
ast->attr = attr;
ZVAL_STR(&ast->val, name);
Z_LINENO(ast->val) = CG(zend_lineno);
return (zend_ast *) ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_class_const_or_name(zend_ast *class_name, zend_ast *name) {
zend_string *name_str = zend_ast_get_str(name);
if (zend_string_equals_literal_ci(name_str, "class")) {
zend_string_release(name_str);
return zend_ast_create(ZEND_AST_CLASS_NAME, class_name);
} else {
return zend_ast_create(ZEND_AST_CLASS_CONST, class_name, name);
}
}
ZEND_API zend_ast *zend_ast_create_decl(
zend_ast_kind kind, uint32_t flags, uint32_t start_lineno, zend_string *doc_comment,
zend_string *name, zend_ast *child0, zend_ast *child1, zend_ast *child2, zend_ast *child3, zend_ast *child4
) {
zend_ast_decl *ast;
ast = zend_ast_alloc(sizeof(zend_ast_decl));
ast->kind = kind;
ast->attr = 0;
ast->start_lineno = start_lineno;
ast->end_lineno = CG(zend_lineno);
ast->flags = flags;
ast->lex_pos = LANG_SCNG(yy_text);
ast->doc_comment = doc_comment;
ast->name = name;
ast->child[0] = child0;
ast->child[1] = child1;
ast->child[2] = child2;
ast->child[3] = child3;
ast->child[4] = child4;
return (zend_ast *) ast;
}
#if ZEND_AST_SPEC
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_0(zend_ast_kind kind) {
zend_ast *ast;
ZEND_ASSERT(kind >> ZEND_AST_NUM_CHILDREN_SHIFT == 0);
ast = zend_ast_alloc(zend_ast_size(0));
ast->kind = kind;
ast->attr = 0;
ast->lineno = CG(zend_lineno);
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_1(zend_ast_kind kind, zend_ast *child) {
zend_ast *ast;
uint32_t lineno;
ZEND_ASSERT(kind >> ZEND_AST_NUM_CHILDREN_SHIFT == 1);
ast = zend_ast_alloc(zend_ast_size(1));
ast->kind = kind;
ast->attr = 0;
ast->child[0] = child;
if (child) {
lineno = zend_ast_get_lineno(child);
} else {
lineno = CG(zend_lineno);
}
ast->lineno = lineno;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_2(zend_ast_kind kind, zend_ast *child1, zend_ast *child2) {
zend_ast *ast;
uint32_t lineno;
ZEND_ASSERT(kind >> ZEND_AST_NUM_CHILDREN_SHIFT == 2);
ast = zend_ast_alloc(zend_ast_size(2));
ast->kind = kind;
ast->attr = 0;
ast->child[0] = child1;
ast->child[1] = child2;
if (child1) {
lineno = zend_ast_get_lineno(child1);
} else if (child2) {
lineno = zend_ast_get_lineno(child2);
} else {
lineno = CG(zend_lineno);
}
ast->lineno = lineno;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_3(zend_ast_kind kind, zend_ast *child1, zend_ast *child2, zend_ast *child3) {
zend_ast *ast;
uint32_t lineno;
ZEND_ASSERT(kind >> ZEND_AST_NUM_CHILDREN_SHIFT == 3);
ast = zend_ast_alloc(zend_ast_size(3));
ast->kind = kind;
ast->attr = 0;
ast->child[0] = child1;
ast->child[1] = child2;
ast->child[2] = child3;
if (child1) {
lineno = zend_ast_get_lineno(child1);
} else if (child2) {
lineno = zend_ast_get_lineno(child2);
} else if (child3) {
lineno = zend_ast_get_lineno(child3);
} else {
lineno = CG(zend_lineno);
}
ast->lineno = lineno;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_4(zend_ast_kind kind, zend_ast *child1, zend_ast *child2, zend_ast *child3, zend_ast *child4) {
zend_ast *ast;
uint32_t lineno;
ZEND_ASSERT(kind >> ZEND_AST_NUM_CHILDREN_SHIFT == 4);
ast = zend_ast_alloc(zend_ast_size(4));
ast->kind = kind;
ast->attr = 0;
ast->child[0] = child1;
ast->child[1] = child2;
ast->child[2] = child3;
ast->child[3] = child4;
if (child1) {
lineno = zend_ast_get_lineno(child1);
} else if (child2) {
lineno = zend_ast_get_lineno(child2);
} else if (child3) {
lineno = zend_ast_get_lineno(child3);
} else if (child4) {
lineno = zend_ast_get_lineno(child4);
} else {
lineno = CG(zend_lineno);
}
ast->lineno = lineno;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_5(zend_ast_kind kind, zend_ast *child1, zend_ast *child2, zend_ast *child3, zend_ast *child4, zend_ast *child5) {
zend_ast *ast;
uint32_t lineno;
ZEND_ASSERT(kind >> ZEND_AST_NUM_CHILDREN_SHIFT == 5);
ast = zend_ast_alloc(zend_ast_size(5));
ast->kind = kind;
ast->attr = 0;
ast->child[0] = child1;
ast->child[1] = child2;
ast->child[2] = child3;
ast->child[3] = child4;
ast->child[4] = child5;
if (child1) {
lineno = zend_ast_get_lineno(child1);
} else if (child2) {
lineno = zend_ast_get_lineno(child2);
} else if (child3) {
lineno = zend_ast_get_lineno(child3);
} else if (child4) {
lineno = zend_ast_get_lineno(child4);
} else if (child5) {
lineno = zend_ast_get_lineno(child5);
} else {
lineno = CG(zend_lineno);
}
ast->lineno = lineno;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_list_0(zend_ast_kind kind) {
zend_ast *ast;
zend_ast_list *list;
ast = zend_ast_alloc(zend_ast_list_size(4));
list = (zend_ast_list *) ast;
list->kind = kind;
list->attr = 0;
list->lineno = CG(zend_lineno);
list->children = 0;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_list_1(zend_ast_kind kind, zend_ast *child) {
zend_ast *ast;
zend_ast_list *list;
uint32_t lineno;
ast = zend_ast_alloc(zend_ast_list_size(4));
list = (zend_ast_list *) ast;
list->kind = kind;
list->attr = 0;
list->children = 1;
list->child[0] = child;
if (child) {
lineno = zend_ast_get_lineno(child);
if (lineno > CG(zend_lineno)) {
lineno = CG(zend_lineno);
}
} else {
lineno = CG(zend_lineno);
}
list->lineno = lineno;
return ast;
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_list_2(zend_ast_kind kind, zend_ast *child1, zend_ast *child2) {
zend_ast *ast;
zend_ast_list *list;
uint32_t lineno;
ast = zend_ast_alloc(zend_ast_list_size(4));
list = (zend_ast_list *) ast;
list->kind = kind;
list->attr = 0;
list->children = 2;
list->child[0] = child1;
list->child[1] = child2;
if (child1) {
lineno = zend_ast_get_lineno(child1);
if (lineno > CG(zend_lineno)) {
lineno = CG(zend_lineno);
}
} else if (child2) {
lineno = zend_ast_get_lineno(child2);
if (lineno > CG(zend_lineno)) {
lineno = CG(zend_lineno);
}
} else {
list->children = 0;
lineno = CG(zend_lineno);
}
list->lineno = lineno;
return ast;
}
#else
static zend_ast *zend_ast_create_from_va_list(zend_ast_kind kind, zend_ast_attr attr, va_list va) {
uint32_t i, children = kind >> ZEND_AST_NUM_CHILDREN_SHIFT;
zend_ast *ast;
ast = zend_ast_alloc(zend_ast_size(children));
ast->kind = kind;
ast->attr = attr;
ast->lineno = (uint32_t) -1;
for (i = 0; i < children; ++i) {
ast->child[i] = va_arg(va, zend_ast *);
if (ast->child[i] != NULL) {
uint32_t lineno = zend_ast_get_lineno(ast->child[i]);
if (lineno < ast->lineno) {
ast->lineno = lineno;
}
}
}
if (ast->lineno == UINT_MAX) {
ast->lineno = CG(zend_lineno);
}
return ast;
}
ZEND_API zend_ast *zend_ast_create_ex(zend_ast_kind kind, zend_ast_attr attr, ...) {
va_list va;
zend_ast *ast;
va_start(va, attr);
ast = zend_ast_create_from_va_list(kind, attr, va);
va_end(va);
return ast;
}
ZEND_API zend_ast *zend_ast_create(zend_ast_kind kind, ...) {
va_list va;
zend_ast *ast;
va_start(va, kind);
ast = zend_ast_create_from_va_list(kind, 0, va);
va_end(va);
return ast;
}
ZEND_API zend_ast *zend_ast_create_list(uint32_t init_children, zend_ast_kind kind, ...) {
zend_ast *ast;
zend_ast_list *list;
ast = zend_ast_alloc(zend_ast_list_size(4));
list = (zend_ast_list *) ast;
list->kind = kind;
list->attr = 0;
list->lineno = CG(zend_lineno);
list->children = 0;
{
va_list va;
uint32_t i;
va_start(va, kind);
for (i = 0; i < init_children; ++i) {
zend_ast *child = va_arg(va, zend_ast *);
ast = zend_ast_list_add(ast, child);
if (child != NULL) {
uint32_t lineno = zend_ast_get_lineno(child);
if (lineno < ast->lineno) {
ast->lineno = lineno;
}
}
}
va_end(va);
}
return ast;
}
#endif
static inline bool is_power_of_two(uint32_t n) {
return ((n != 0) && (n == (n & (~n + 1))));
}
ZEND_API zend_ast * ZEND_FASTCALL zend_ast_list_add(zend_ast *ast, zend_ast *op) {
zend_ast_list *list = zend_ast_get_list(ast);
if (list->children >= 4 && is_power_of_two(list->children)) {
list = zend_ast_realloc(list,
zend_ast_list_size(list->children), zend_ast_list_size(list->children * 2));
}
list->child[list->children++] = op;
return (zend_ast *) list;
}
static zend_result zend_ast_add_array_element(zval *result, zval *offset, zval *expr)
{
switch (Z_TYPE_P(offset)) {
case IS_UNDEF:
if (!zend_hash_next_index_insert(Z_ARRVAL_P(result), expr)) {
zend_throw_error(NULL,
"Cannot add element to the array as the next element is already occupied");
return FAILURE;
}
break;
case IS_STRING:
zend_symtable_update(Z_ARRVAL_P(result), Z_STR_P(offset), expr);
zval_ptr_dtor_str(offset);
break;
case IS_NULL:
zend_symtable_update(Z_ARRVAL_P(result), ZSTR_EMPTY_ALLOC(), expr);
break;
case IS_LONG:
zend_hash_index_update(Z_ARRVAL_P(result), Z_LVAL_P(offset), expr);
break;
case IS_FALSE:
zend_hash_index_update(Z_ARRVAL_P(result), 0, expr);
break;
case IS_TRUE:
zend_hash_index_update(Z_ARRVAL_P(result), 1, expr);
break;
case IS_DOUBLE:
zend_hash_index_update(Z_ARRVAL_P(result), zend_dval_to_lval(Z_DVAL_P(offset)), expr);
break;
case IS_RESOURCE:
zend_error(E_WARNING, "Resource ID#%d used as offset, casting to integer (%d)", Z_RES_HANDLE_P(offset), Z_RES_HANDLE_P(offset));
zend_hash_index_update(Z_ARRVAL_P(result), Z_RES_HANDLE_P(offset), expr);
break;
default:
zend_type_error("Illegal offset type");
return FAILURE;
}
return SUCCESS;
}
static zend_result zend_ast_add_unpacked_element(zval *result, zval *expr) {
if (EXPECTED(Z_TYPE_P(expr) == IS_ARRAY)) {
HashTable *ht = Z_ARRVAL_P(expr);
zval *val;
zend_string *key;
ZEND_HASH_FOREACH_STR_KEY_VAL(ht, key, val) {
if (key) {
zend_hash_update(Z_ARRVAL_P(result), key, val);
} else {
if (!zend_hash_next_index_insert(Z_ARRVAL_P(result), val)) {
zend_throw_error(NULL,
"Cannot add element to the array as the next element is already occupied");
return FAILURE;
}
}
Z_TRY_ADDREF_P(val);
} ZEND_HASH_FOREACH_END();
return SUCCESS;
}
/* Objects or references cannot occur in a constant expression. */
zend_throw_error(NULL, "Only arrays and Traversables can be unpacked");
return FAILURE;
}
ZEND_API zend_result ZEND_FASTCALL zend_ast_evaluate(zval *result, zend_ast *ast, zend_class_entry *scope)
{
zval op1, op2;
zend_result ret = SUCCESS;
switch (ast->kind) {
case ZEND_AST_BINARY_OP:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
} else if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
} else {
binary_op_type op = get_binary_op(ast->attr);
ret = op(result, &op1, &op2);
zval_ptr_dtor_nogc(&op1);
zval_ptr_dtor_nogc(&op2);
}
break;
case ZEND_AST_GREATER:
case ZEND_AST_GREATER_EQUAL:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
} else if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
} else {
/* op1 > op2 is the same as op2 < op1 */
binary_op_type op = ast->kind == ZEND_AST_GREATER
? is_smaller_function : is_smaller_or_equal_function;
ret = op(result, &op2, &op1);
zval_ptr_dtor_nogc(&op1);
zval_ptr_dtor_nogc(&op2);
}
break;
case ZEND_AST_UNARY_OP:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
} else {
unary_op_type op = get_unary_op(ast->attr);
ret = op(result, &op1);
zval_ptr_dtor_nogc(&op1);
}
break;
case ZEND_AST_ZVAL:
{
zval *zv = zend_ast_get_zval(ast);
ZVAL_COPY(result, zv);
break;
}
case ZEND_AST_CONSTANT:
{
zend_string *name = zend_ast_get_constant_name(ast);
zval *zv = zend_get_constant_ex(name, scope, ast->attr);
if (UNEXPECTED(zv == NULL)) {
ZVAL_UNDEF(result);
return FAILURE;
}
ZVAL_COPY_OR_DUP(result, zv);
break;
}
case ZEND_AST_CONSTANT_CLASS:
if (scope) {
ZVAL_STR_COPY(result, scope->name);
} else {
ZVAL_EMPTY_STRING(result);
}
break;
case ZEND_AST_CLASS_NAME:
if (!scope) {
zend_throw_error(NULL, "Cannot use \"self\" when no class scope is active");
return FAILURE;
}
if (ast->attr == ZEND_FETCH_CLASS_SELF) {
ZVAL_STR_COPY(result, scope->name);
} else if (ast->attr == ZEND_FETCH_CLASS_PARENT) {
if (!scope->parent) {
zend_throw_error(NULL,
"Cannot use \"parent\" when current class scope has no parent");
return FAILURE;
}
ZVAL_STR_COPY(result, scope->parent->name);
} else {
ZEND_ASSERT(0 && "Should have errored during compilation");
}
break;
case ZEND_AST_AND:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
break;
}
if (zend_is_true(&op1)) {
if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
break;
}
ZVAL_BOOL(result, zend_is_true(&op2));
zval_ptr_dtor_nogc(&op2);
} else {
ZVAL_FALSE(result);
}
zval_ptr_dtor_nogc(&op1);
break;
case ZEND_AST_OR:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
break;
}
if (zend_is_true(&op1)) {
ZVAL_TRUE(result);
} else {
if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
break;
}
ZVAL_BOOL(result, zend_is_true(&op2));
zval_ptr_dtor_nogc(&op2);
}
zval_ptr_dtor_nogc(&op1);
break;
case ZEND_AST_CONDITIONAL:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
break;
}
if (zend_is_true(&op1)) {
if (!ast->child[1]) {
*result = op1;
} else {
if (UNEXPECTED(zend_ast_evaluate(result, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
break;
}
zval_ptr_dtor_nogc(&op1);
}
} else {
if (UNEXPECTED(zend_ast_evaluate(result, ast->child[2], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
break;
}
zval_ptr_dtor_nogc(&op1);
}
break;
case ZEND_AST_COALESCE:
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
break;
}
if (Z_TYPE(op1) > IS_NULL) {
*result = op1;
} else {
if (UNEXPECTED(zend_ast_evaluate(result, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
break;
}
zval_ptr_dtor_nogc(&op1);
}
break;
case ZEND_AST_UNARY_PLUS:
if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
} else {
ZVAL_LONG(&op1, 0);
ret = add_function(result, &op1, &op2);
zval_ptr_dtor_nogc(&op2);
}
break;
case ZEND_AST_UNARY_MINUS:
if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
} else {
ZVAL_LONG(&op1, 0);
ret = sub_function(result, &op1, &op2);
zval_ptr_dtor_nogc(&op2);
}
break;
case ZEND_AST_ARRAY:
{
uint32_t i;
zend_ast_list *list = zend_ast_get_list(ast);
if (!list->children) {
ZVAL_EMPTY_ARRAY(result);
break;
}
array_init(result);
for (i = 0; i < list->children; i++) {
zend_ast *elem = list->child[i];
if (elem->kind == ZEND_AST_UNPACK) {
if (UNEXPECTED(zend_ast_evaluate(&op1, elem->child[0], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(result);
return FAILURE;
}
if (UNEXPECTED(zend_ast_add_unpacked_element(result, &op1) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
zval_ptr_dtor_nogc(result);
return FAILURE;
}
zval_ptr_dtor_nogc(&op1);
continue;
}
if (elem->child[1]) {
if (UNEXPECTED(zend_ast_evaluate(&op1, elem->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(result);
return FAILURE;
}
} else {
ZVAL_UNDEF(&op1);
}
if (UNEXPECTED(zend_ast_evaluate(&op2, elem->child[0], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
zval_ptr_dtor_nogc(result);
return FAILURE;
}
if (UNEXPECTED(zend_ast_add_array_element(result, &op1, &op2) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
zval_ptr_dtor_nogc(&op2);
zval_ptr_dtor_nogc(result);
return FAILURE;
}
}
}
break;
case ZEND_AST_DIM:
if (ast->child[1] == NULL) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for reading");
}
if (UNEXPECTED(zend_ast_evaluate(&op1, ast->child[0], scope) != SUCCESS)) {
ret = FAILURE;
break;
}
// DIM on objects is disallowed because it allows executing arbitrary expressions
if (Z_TYPE(op1) == IS_OBJECT) {
zval_ptr_dtor_nogc(&op1);
zend_throw_error(NULL, "Cannot use [] on objects in constant expression");
ret = FAILURE;
break;
}
if (UNEXPECTED(zend_ast_evaluate(&op2, ast->child[1], scope) != SUCCESS)) {
zval_ptr_dtor_nogc(&op1);
ret = FAILURE;
break;
}
zend_fetch_dimension_const(result, &op1, &op2, (ast->attr & ZEND_DIM_IS) ? BP_VAR_IS : BP_VAR_R);
zval_ptr_dtor_nogc(&op1);
zval_ptr_dtor_nogc(&op2);
if (UNEXPECTED(EG(exception))) {
return FAILURE;
}
break;
case ZEND_AST_CONST_ENUM_INIT:
{
zend_ast *class_name_ast = ast->child[0];
zend_string *class_name = zend_ast_get_str(class_name_ast);
zend_ast *case_name_ast = ast->child[1];
zend_string *case_name = zend_ast_get_str(case_name_ast);
zend_ast *case_value_ast = ast->child[2];
zval *case_value_zv = case_value_ast != NULL
? zend_ast_get_zval(case_value_ast)
: NULL;
zend_class_entry *ce = zend_lookup_class(class_name);
zend_enum_new(result, ce, case_name, case_value_zv);
break;
}
case ZEND_AST_CLASS_CONST:
{
zend_string *class_name = zend_ast_get_str(ast->child[0]);
zend_string *const_name = zend_ast_get_str(ast->child[1]);
zval *zv = zend_get_class_constant_ex(class_name, const_name, scope, ast->attr);
if (UNEXPECTED(zv == NULL)) {
ZVAL_UNDEF(result);
return FAILURE;
}
ZVAL_COPY_OR_DUP(result, zv);
break;
}
default:
zend_throw_error(NULL, "Unsupported constant expression");
ret = FAILURE;
}
return ret;
}
static size_t ZEND_FASTCALL zend_ast_tree_size(zend_ast *ast)
{
size_t size;
if (ast->kind == ZEND_AST_ZVAL || ast->kind == ZEND_AST_CONSTANT) {
size = sizeof(zend_ast_zval);
} else if (zend_ast_is_list(ast)) {
uint32_t i;
zend_ast_list *list = zend_ast_get_list(ast);
size = zend_ast_list_size(list->children);
for (i = 0; i < list->children; i++) {
if (list->child[i]) {
size += zend_ast_tree_size(list->child[i]);
}
}
} else {
uint32_t i, children = zend_ast_get_num_children(ast);
size = zend_ast_size(children);
for (i = 0; i < children; i++) {
if (ast->child[i]) {
size += zend_ast_tree_size(ast->child[i]);
}
}
}
return size;
}
static void* ZEND_FASTCALL zend_ast_tree_copy(zend_ast *ast, void *buf)
{
if (ast->kind == ZEND_AST_ZVAL) {
zend_ast_zval *new = (zend_ast_zval*)buf;
new->kind = ZEND_AST_ZVAL;
new->attr = ast->attr;
ZVAL_COPY(&new->val, zend_ast_get_zval(ast));
buf = (void*)((char*)buf + sizeof(zend_ast_zval));
} else if (ast->kind == ZEND_AST_CONSTANT) {
zend_ast_zval *new = (zend_ast_zval*)buf;
new->kind = ZEND_AST_CONSTANT;
new->attr = ast->attr;
ZVAL_STR_COPY(&new->val, zend_ast_get_constant_name(ast));
buf = (void*)((char*)buf + sizeof(zend_ast_zval));
} else if (zend_ast_is_list(ast)) {
zend_ast_list *list = zend_ast_get_list(ast);
zend_ast_list *new = (zend_ast_list*)buf;
uint32_t i;
new->kind = list->kind;
new->attr = list->attr;
new->children = list->children;
buf = (void*)((char*)buf + zend_ast_list_size(list->children));
for (i = 0; i < list->children; i++) {
if (list->child[i]) {
new->child[i] = (zend_ast*)buf;
buf = zend_ast_tree_copy(list->child[i], buf);
} else {
new->child[i] = NULL;
}
}
} else {
uint32_t i, children = zend_ast_get_num_children(ast);
zend_ast *new = (zend_ast*)buf;
new->kind = ast->kind;
new->attr = ast->attr;
buf = (void*)((char*)buf + zend_ast_size(children));
for (i = 0; i < children; i++) {
if (ast->child[i]) {
new->child[i] = (zend_ast*)buf;
buf = zend_ast_tree_copy(ast->child[i], buf);
} else {
new->child[i] = NULL;
}
}
}
return buf;
}
ZEND_API zend_ast_ref * ZEND_FASTCALL zend_ast_copy(zend_ast *ast)
{
size_t tree_size;
zend_ast_ref *ref;
ZEND_ASSERT(ast != NULL);
tree_size = zend_ast_tree_size(ast) + sizeof(zend_ast_ref);
ref = emalloc(tree_size);
zend_ast_tree_copy(ast, GC_AST(ref));
GC_SET_REFCOUNT(ref, 1);
GC_TYPE_INFO(ref) = GC_CONSTANT_AST;
return ref;
}
ZEND_API void ZEND_FASTCALL zend_ast_destroy(zend_ast *ast)
{
tail_call:
if (!ast) {
return;
}
if (EXPECTED(ast->kind >= ZEND_AST_VAR)) {
uint32_t i, children = zend_ast_get_num_children(ast);
for (i = 1; i < children; i++) {
zend_ast_destroy(ast->child[i]);
}
ast = ast->child[0];
goto tail_call;
} else if (EXPECTED(ast->kind == ZEND_AST_ZVAL)) {
zval_ptr_dtor_nogc(zend_ast_get_zval(ast));
} else if (EXPECTED(zend_ast_is_list(ast))) {
zend_ast_list *list = zend_ast_get_list(ast);
if (list->children) {
uint32_t i;
for (i = 1; i < list->children; i++) {
zend_ast_destroy(list->child[i]);
}
ast = list->child[0];
goto tail_call;
}
} else if (EXPECTED(ast->kind == ZEND_AST_CONSTANT)) {
zend_string_release_ex(zend_ast_get_constant_name(ast), 0);
} else if (EXPECTED(ast->kind >= ZEND_AST_FUNC_DECL)) {
zend_ast_decl *decl = (zend_ast_decl *) ast;
if (decl->name) {
zend_string_release_ex(decl->name, 0);
}
if (decl->doc_comment) {
zend_string_release_ex(decl->doc_comment, 0);
}
zend_ast_destroy(decl->child[0]);
zend_ast_destroy(decl->child[1]);
zend_ast_destroy(decl->child[2]);
zend_ast_destroy(decl->child[3]);
ast = decl->child[4];
goto tail_call;
}
}
ZEND_API void ZEND_FASTCALL zend_ast_ref_destroy(zend_ast_ref *ast)
{
zend_ast_destroy(GC_AST(ast));
efree(ast);
}
ZEND_API void zend_ast_apply(zend_ast *ast, zend_ast_apply_func fn) {
if (zend_ast_is_list(ast)) {
zend_ast_list *list = zend_ast_get_list(ast);
uint32_t i;
for (i = 0; i < list->children; ++i) {
fn(&list->child[i]);
}
} else {
uint32_t i, children = zend_ast_get_num_children(ast);
for (i = 0; i < children; ++i) {
fn(&ast->child[i]);
}
}
}
/*
* Operator Precedence
* ====================
* priority associativity operators
* ----------------------------------
* 10 left include, include_once, eval, require, require_once
* 20 left ,
* 30 left or
* 40 left xor
* 50 left and
* 60 right print
* 70 right yield
* 80 right =>
* 85 right yield from
* 90 right = += -= *= /= .= %= &= |= ^= <<= >>= **=
* 100 left ? :
* 110 right ??
* 120 left ||
* 130 left &&
* 140 left |
* 150 left ^
* 160 left &
* 170 non-associative == != === !==
* 180 non-associative < <= > >= <=>
* 185 left .
* 190 left << >>
* 200 left + -
* 210 left * / %
* 220 right !
* 230 non-associative instanceof
* 240 right + - ++ -- ~ (type) @
* 250 right **
* 260 left [
* 270 non-associative clone new