/Zend/zend_compile.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: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Nikita Popov <nikic@php.net>                                |
   +----------------------------------------------------------------------+
*/

#include <zend_language_parser.h>
#include "zend.h"
#include "zend_compile.h"
#include "zend_constants.h"
#include "zend_llist.h"
#include "zend_API.h"
#include "zend_exceptions.h"
#include "zend_interfaces.h"
#include "zend_virtual_cwd.h"
#include "zend_multibyte.h"
#include "zend_language_scanner.h"
#include "zend_inheritance.h"
#include "zend_vm.h"

#define SET_NODE(target, src) do { \
		target ## _type = (src)->op_type; \
		if ((src)->op_type == IS_CONST) { \
			target.constant = zend_add_literal(&(src)->u.constant); \
		} else { \
			target = (src)->u.op; \
		} \
	} while (0)

#define GET_NODE(target, src) do { \
		(target)->op_type = src ## _type; \
		if ((target)->op_type == IS_CONST) { \
			ZVAL_COPY_VALUE(&(target)->u.constant, CT_CONSTANT(src)); \
		} else { \
			(target)->u.op = src; \
		} \
	} while (0)

#define FC(member) (CG(file_context).member)

typedef struct _zend_loop_var {
	zend_uchar opcode;
	zend_uchar var_type;
	uint32_t   var_num;
	uint32_t   try_catch_offset;
} zend_loop_var;

static inline uint32_t zend_alloc_cache_slots(unsigned count) {
	if (count == 0) {
		return (uint32_t) -1;
	}

	zend_op_array *op_array = CG(active_op_array);
	uint32_t ret = op_array->cache_size;
	op_array->cache_size += count * sizeof(void*);
	return ret;
}

static inline uint32_t zend_alloc_cache_slot(void) {
	return zend_alloc_cache_slots(1);
}

ZEND_API zend_op_array *(*zend_compile_file)(zend_file_handle *file_handle, int type);
ZEND_API zend_op_array *(*zend_compile_string)(zval *source_string, const char *filename);

#ifndef ZTS
ZEND_API zend_compiler_globals compiler_globals;
ZEND_API zend_executor_globals executor_globals;
#endif

static zend_op *zend_emit_op(znode *result, zend_uchar opcode, znode *op1, znode *op2);
static zend_bool zend_try_ct_eval_array(zval *result, zend_ast *ast);

static void init_op(zend_op *op)
{
	MAKE_NOP(op);
	op->extended_value = 0;
	op->lineno = CG(zend_lineno);
}

static zend_always_inline uint32_t get_next_op_number(void)
{
	return CG(active_op_array)->last;
}

static zend_op *get_next_op(void)
{
	zend_op_array *op_array = CG(active_op_array);
	uint32_t next_op_num = op_array->last++;
	zend_op *next_op;

	if (UNEXPECTED(next_op_num >= CG(context).opcodes_size)) {
		CG(context).opcodes_size *= 4;
		op_array->opcodes = erealloc(op_array->opcodes, CG(context).opcodes_size * sizeof(zend_op));
	}

	next_op = &(op_array->opcodes[next_op_num]);

	init_op(next_op);

	return next_op;
}

static zend_brk_cont_element *get_next_brk_cont_element(void)
{
	CG(context).last_brk_cont++;
	CG(context).brk_cont_array = erealloc(CG(context).brk_cont_array, sizeof(zend_brk_cont_element) * CG(context).last_brk_cont);
	return &CG(context).brk_cont_array[CG(context).last_brk_cont-1];
}

static void zend_destroy_property_info_internal(zval *zv) /* {{{ */
{
	zend_property_info *property_info = Z_PTR_P(zv);

	zend_string_release(property_info->name);
	zend_type_release(property_info->type, /* persistent */ 1);
	free(property_info);
}
/* }}} */

static zend_string *zend_build_runtime_definition_key(zend_string *name, uint32_t start_lineno) /* {{{ */
{
	zend_string *filename = CG(active_op_array)->filename;
	zend_string *result = zend_strpprintf(0, "%c%s%s:%" PRIu32 "$%" PRIx32,
		'\0', ZSTR_VAL(name), ZSTR_VAL(filename), start_lineno, CG(rtd_key_counter)++);
	return zend_new_interned_string(result);
}
/* }}} */

static zend_bool zend_get_unqualified_name(const zend_string *name, const char **result, size_t *result_len) /* {{{ */
{
	const char *ns_separator = zend_memrchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
	if (ns_separator != NULL) {
		*result = ns_separator + 1;
		*result_len = ZSTR_VAL(name) + ZSTR_LEN(name) - *result;
		return 1;
	}

	return 0;
}
/* }}} */

struct reserved_class_name {
	const char *name;
	size_t len;
};
static const struct reserved_class_name reserved_class_names[] = {
	{ZEND_STRL("bool")},
	{ZEND_STRL("false")},
	{ZEND_STRL("float")},
	{ZEND_STRL("int")},
	{ZEND_STRL("null")},
	{ZEND_STRL("parent")},
	{ZEND_STRL("self")},
	{ZEND_STRL("static")},
	{ZEND_STRL("string")},
	{ZEND_STRL("true")},
	{ZEND_STRL("void")},
	{ZEND_STRL("iterable")},
	{ZEND_STRL("object")},
	{NULL, 0}
};

static zend_bool zend_is_reserved_class_name(const zend_string *name) /* {{{ */
{
	const struct reserved_class_name *reserved = reserved_class_names;

	const char *uqname = ZSTR_VAL(name);
	size_t uqname_len = ZSTR_LEN(name);
	zend_get_unqualified_name(name, &uqname, &uqname_len);

	for (; reserved->name; ++reserved) {
		if (uqname_len == reserved->len
			&& zend_binary_strcasecmp(uqname, uqname_len, reserved->name, reserved->len) == 0
		) {
			return 1;
		}
	}

	return 0;
}
/* }}} */

void zend_assert_valid_class_name(const zend_string *name) /* {{{ */
{
	if (zend_is_reserved_class_name(name)) {
		zend_error_noreturn(E_COMPILE_ERROR,
			"Cannot use '%s' as class name as it is reserved", ZSTR_VAL(name));
	}
}
/* }}} */

typedef struct _builtin_type_info {
	const char* name;
	const size_t name_len;
	const zend_uchar type;
} builtin_type_info;

static const builtin_type_info builtin_types[] = {
	{ZEND_STRL("null"), IS_NULL},
	{ZEND_STRL("false"), IS_FALSE},
	{ZEND_STRL("int"), IS_LONG},
	{ZEND_STRL("float"), IS_DOUBLE},
	{ZEND_STRL("string"), IS_STRING},
	{ZEND_STRL("bool"), _IS_BOOL},
	{ZEND_STRL("void"), IS_VOID},
	{ZEND_STRL("iterable"), IS_ITERABLE},
	{ZEND_STRL("object"), IS_OBJECT},
	{NULL, 0, IS_UNDEF}
};

typedef struct {
	const char *name;
	size_t name_len;
	const char *correct_name;
} confusable_type_info;

static const confusable_type_info confusable_types[] = {
	{ZEND_STRL("boolean"), "bool"},
	{ZEND_STRL("integer"), "int"},
	{ZEND_STRL("double"), "float"},
	{ZEND_STRL("resource"), NULL},
	{NULL, 0, NULL},
};

static zend_always_inline zend_uchar zend_lookup_builtin_type_by_name(const zend_string *name) /* {{{ */
{
	const builtin_type_info *info = &builtin_types[0];

	for (; info->name; ++info) {
		if (ZSTR_LEN(name) == info->name_len
			&& zend_binary_strcasecmp(ZSTR_VAL(name), ZSTR_LEN(name), info->name, info->name_len) == 0
		) {
			return info->type;
		}
	}

	return 0;
}
/* }}} */

static zend_always_inline zend_bool zend_is_confusable_type(const zend_string *name, const char **correct_name) /* {{{ */
{
	const confusable_type_info *info = confusable_types;

	/* Intentionally using case-sensitive comparison here, because "integer" is likely intended
	 * as a scalar type, while "Integer" is likely a class type. */
	for (; info->name; ++info) {
		if (ZSTR_LEN(name) == info->name_len
			&& memcmp(ZSTR_VAL(name), info->name, info->name_len) == 0
		) {
			*correct_name = info->correct_name;
			return 1;
		}
	}

	return 0;
}
/* }}} */

static zend_bool zend_is_not_imported(zend_string *name) {
	/* Assuming "name" is unqualified here. */
	return !FC(imports) || zend_hash_find_ptr_lc(FC(imports), name) == NULL;
}

void zend_oparray_context_begin(zend_oparray_context *prev_context) /* {{{ */
{
	*prev_context = CG(context);
	CG(context).opcodes_size = INITIAL_OP_ARRAY_SIZE;
	CG(context).vars_size = 0;
	CG(context).literals_size = 0;
	CG(context).fast_call_var = -1;
	CG(context).try_catch_offset = -1;
	CG(context).current_brk_cont = -1;
	CG(context).last_brk_cont = 0;
	CG(context).brk_cont_array = NULL;
	CG(context).labels = NULL;
}
/* }}} */

void zend_oparray_context_end(zend_oparray_context *prev_context) /* {{{ */
{
	if (CG(context).brk_cont_array) {
		efree(CG(context).brk_cont_array);
		CG(context).brk_cont_array = NULL;
	}
	if (CG(context).labels) {
		zend_hash_destroy(CG(context).labels);
		FREE_HASHTABLE(CG(context).labels);
		CG(context).labels = NULL;
	}
	CG(context) = *prev_context;
}
/* }}} */

static void zend_reset_import_tables(void) /* {{{ */
{
	if (FC(imports)) {
		zend_hash_destroy(FC(imports));
		efree(FC(imports));
		FC(imports) = NULL;
	}

	if (FC(imports_function)) {
		zend_hash_destroy(FC(imports_function));
		efree(FC(imports_function));
		FC(imports_function) = NULL;
	}

	if (FC(imports_const)) {
		zend_hash_destroy(FC(imports_const));
		efree(FC(imports_const));
		FC(imports_const) = NULL;
	}
}
/* }}} */

static void zend_end_namespace(void) /* {{{ */ {
	FC(in_namespace) = 0;
	zend_reset_import_tables();
	if (FC(current_namespace)) {
		zend_string_release_ex(FC(current_namespace), 0);
		FC(current_namespace) = NULL;
	}
}
/* }}} */

void zend_file_context_begin(zend_file_context *prev_context) /* {{{ */
{
	*prev_context = CG(file_context);
	FC(imports) = NULL;
	FC(imports_function) = NULL;
	FC(imports_const) = NULL;
	FC(current_namespace) = NULL;
	FC(in_namespace) = 0;
	FC(has_bracketed_namespaces) = 0;
	FC(declarables).ticks = 0;
	zend_hash_init(&FC(seen_symbols), 8, NULL, NULL, 0);
}
/* }}} */

void zend_file_context_end(zend_file_context *prev_context) /* {{{ */
{
	zend_end_namespace();
	zend_hash_destroy(&FC(seen_symbols));
	CG(file_context) = *prev_context;
}
/* }}} */

void zend_init_compiler_data_structures(void) /* {{{ */
{
	zend_stack_init(&CG(loop_var_stack), sizeof(zend_loop_var));
	zend_stack_init(&CG(delayed_oplines_stack), sizeof(zend_op));
	CG(active_class_entry) = NULL;
	CG(in_compilation) = 0;
	CG(skip_shebang) = 0;

	CG(encoding_declared) = 0;
	CG(memoized_exprs) = NULL;
	CG(memoize_mode) = 0;
}
/* }}} */

static void zend_register_seen_symbol(zend_string *name, uint32_t kind) {
	zval *zv = zend_hash_find(&FC(seen_symbols), name);
	if (zv) {
		Z_LVAL_P(zv) |= kind;
	} else {
		zval tmp;
		ZVAL_LONG(&tmp, kind);
		zend_hash_add_new(&FC(seen_symbols), name, &tmp);
	}
}

static zend_bool zend_have_seen_symbol(zend_string *name, uint32_t kind) {
	zval *zv = zend_hash_find(&FC(seen_symbols), name);
	return zv && (Z_LVAL_P(zv) & kind) != 0;
}

ZEND_API void file_handle_dtor(zend_file_handle *fh) /* {{{ */
{

	zend_file_handle_dtor(fh);
}
/* }}} */

void init_compiler(void) /* {{{ */
{
	CG(arena) = zend_arena_create(64 * 1024);
	CG(active_op_array) = NULL;
	memset(&CG(context), 0, sizeof(CG(context)));
	zend_init_compiler_data_structures();
	zend_init_rsrc_list();
	zend_hash_init(&CG(filenames_table), 8, NULL, ZVAL_PTR_DTOR, 0);
	zend_llist_init(&CG(open_files), sizeof(zend_file_handle), (void (*)(void *)) file_handle_dtor, 0);
	CG(unclean_shutdown) = 0;

	CG(delayed_variance_obligations) = NULL;
	CG(delayed_autoloads) = NULL;
}
/* }}} */

void shutdown_compiler(void) /* {{{ */
{
	zend_stack_destroy(&CG(loop_var_stack));
	zend_stack_destroy(&CG(delayed_oplines_stack));
	zend_hash_destroy(&CG(filenames_table));
	zend_arena_destroy(CG(arena));

	if (CG(delayed_variance_obligations)) {
		zend_hash_destroy(CG(delayed_variance_obligations));
		FREE_HASHTABLE(CG(delayed_variance_obligations));
		CG(delayed_variance_obligations) = NULL;
	}
	if (CG(delayed_autoloads)) {
		zend_hash_destroy(CG(delayed_autoloads));
		FREE_HASHTABLE(CG(delayed_autoloads));
		CG(delayed_autoloads) = NULL;
	}
}
/* }}} */

ZEND_API zend_string *zend_set_compiled_filename(zend_string *new_compiled_filename) /* {{{ */
{
	zval *p, rv;

	if ((p = zend_hash_find(&CG(filenames_table), new_compiled_filename))) {
		ZEND_ASSERT(Z_TYPE_P(p) == IS_STRING);
		CG(compiled_filename) = Z_STR_P(p);
		return Z_STR_P(p);
	}

	new_compiled_filename = zend_new_interned_string(zend_string_copy(new_compiled_filename));
	ZVAL_STR(&rv, new_compiled_filename);
	zend_hash_add_new(&CG(filenames_table), new_compiled_filename, &rv);

	CG(compiled_filename) = new_compiled_filename;
	return new_compiled_filename;
}
/* }}} */

ZEND_API void zend_restore_compiled_filename(zend_string *original_compiled_filename) /* {{{ */
{
	CG(compiled_filename) = original_compiled_filename;
}
/* }}} */

ZEND_API zend_string *zend_get_compiled_filename(void) /* {{{ */
{
	return CG(compiled_filename);
}
/* }}} */

ZEND_API int zend_get_compiled_lineno(void) /* {{{ */
{
	return CG(zend_lineno);
}
/* }}} */

ZEND_API zend_bool zend_is_compiling(void) /* {{{ */
{
	return CG(in_compilation);
}
/* }}} */

static zend_always_inline uint32_t get_temporary_variable(void) /* {{{ */
{
	return (uint32_t)CG(active_op_array)->T++;
}
/* }}} */

static int lookup_cv(zend_string *name) /* {{{ */{
	zend_op_array *op_array = CG(active_op_array);
	int i = 0;
	zend_ulong hash_value = zend_string_hash_val(name);

	while (i < op_array->last_var) {
		if (ZSTR_H(op_array->vars[i]) == hash_value
		 && zend_string_equals(op_array->vars[i], name)) {
			return EX_NUM_TO_VAR(i);
		}
		i++;
	}
	i = op_array->last_var;
	op_array->last_var++;
	if (op_array->last_var > CG(context).vars_size) {
		CG(context).vars_size += 16; /* FIXME */
		op_array->vars = erealloc(op_array->vars, CG(context).vars_size * sizeof(zend_string*));
	}

	op_array->vars[i] = zend_string_copy(name);
	return EX_NUM_TO_VAR(i);
}
/* }}} */

static inline zend_string *zval_make_interned_string(zval *zv) /* {{{ */
{
	ZEND_ASSERT(Z_TYPE_P(zv) == IS_STRING);
	Z_STR_P(zv) = zend_new_interned_string(Z_STR_P(zv));
	if (ZSTR_IS_INTERNED(Z_STR_P(zv))) {
		Z_TYPE_FLAGS_P(zv) = 0;
	}
	return Z_STR_P(zv);
}

/* Common part of zend_add_literal and zend_append_individual_literal */
static inline void zend_insert_literal(zend_op_array *op_array, zval *zv, int literal_position) /* {{{ */
{
	zval *lit = CT_CONSTANT_EX(op_array, literal_position);
	if (Z_TYPE_P(zv) == IS_STRING) {
		zval_make_interned_string(zv);
	}
	ZVAL_COPY_VALUE(lit, zv);
	Z_EXTRA_P(lit) = 0;
}
/* }}} */

/* Is used while compiling a function, using the context to keep track
   of an approximate size to avoid to relocate to often.
   Literals are truncated to actual size in the second compiler pass (pass_two()). */
static int zend_add_literal(zval *zv) /* {{{ */
{
	zend_op_array *op_array = CG(active_op_array);
	int i = op_array->last_literal;
	op_array->last_literal++;
	if (i >= CG(context).literals_size) {
		while (i >= CG(context).literals_size) {
			CG(context).literals_size += 16; /* FIXME */
		}
		op_array->literals = (zval*)erealloc(op_array->literals, CG(context).literals_size * sizeof(zval));
	}
	zend_insert_literal(op_array, zv, i);
	return i;
}
/* }}} */

static inline int zend_add_literal_string(zend_string **str) /* {{{ */
{
	int ret;
	zval zv;
	ZVAL_STR(&zv, *str);
	ret = zend_add_literal(&zv);
	*str = Z_STR(zv);
	return ret;
}
/* }}} */

static int zend_add_func_name_literal(zend_string *name) /* {{{ */
{
	/* Original name */
	int ret = zend_add_literal_string(&name);

	/* Lowercased name */
	zend_string *lc_name = zend_string_tolower(name);
	zend_add_literal_string(&lc_name);

	return ret;
}
/* }}} */

static int zend_add_ns_func_name_literal(zend_string *name) /* {{{ */
{
	const char *unqualified_name;
	size_t unqualified_name_len;

	/* Original name */
	int ret = zend_add_literal_string(&name);

	/* Lowercased name */
	zend_string *lc_name = zend_string_tolower(name);
	zend_add_literal_string(&lc_name);

	/* Lowercased unqualfied name */
	if (zend_get_unqualified_name(name, &unqualified_name, &unqualified_name_len)) {
		lc_name = zend_string_alloc(unqualified_name_len, 0);
		zend_str_tolower_copy(ZSTR_VAL(lc_name), unqualified_name, unqualified_name_len);
		zend_add_literal_string(&lc_name);
	}

	return ret;
}
/* }}} */

static int zend_add_class_name_literal(zend_string *name) /* {{{ */
{
	/* Original name */
	int ret = zend_add_literal_string(&name);

	/* Lowercased name */
	zend_string *lc_name = zend_string_tolower(name);
	zend_add_literal_string(&lc_name);

	return ret;
}
/* }}} */

static int zend_add_const_name_literal(zend_string *name, zend_bool unqualified) /* {{{ */
{
	zend_string *tmp_name;

	int ret = zend_add_literal_string(&name);

	size_t ns_len = 0, after_ns_len = ZSTR_LEN(name);
	const char *after_ns = zend_memrchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
	if (after_ns) {
		after_ns += 1;
		ns_len = after_ns - ZSTR_VAL(name) - 1;
		after_ns_len = ZSTR_LEN(name) - ns_len - 1;

		/* lowercased namespace name & original constant name */
		tmp_name = zend_string_init(ZSTR_VAL(name), ZSTR_LEN(name), 0);
		zend_str_tolower(ZSTR_VAL(tmp_name), ns_len);
		zend_add_literal_string(&tmp_name);

		if (!unqualified) {
			return ret;
		}
	} else {
		after_ns = ZSTR_VAL(name);
	}

	/* original unqualified constant name */
	tmp_name = zend_string_init(after_ns, after_ns_len, 0);
	zend_add_literal_string(&tmp_name);

	return ret;
}
/* }}} */

#define LITERAL_STR(op, str) do { \
		zval _c; \
		ZVAL_STR(&_c, str); \
		op.constant = zend_add_literal(&_c); \
	} while (0)

void zend_stop_lexing(void)
{
	if (LANG_SCNG(on_event)) {
		LANG_SCNG(on_event)(ON_STOP, END, 0, LANG_SCNG(on_event_context));
	}

	LANG_SCNG(yy_cursor) = LANG_SCNG(yy_limit);
}

static inline void zend_begin_loop(
		zend_uchar free_opcode, const znode *loop_var, zend_bool is_switch) /* {{{ */
{
	zend_brk_cont_element *brk_cont_element;
	int parent = CG(context).current_brk_cont;
	zend_loop_var info = {0};

	CG(context).current_brk_cont = CG(context).last_brk_cont;
	brk_cont_element = get_next_brk_cont_element();
	brk_cont_element->parent = parent;
	brk_cont_element->is_switch = is_switch;

	if (loop_var && (loop_var->op_type & (IS_VAR|IS_TMP_VAR))) {
		uint32_t start = get_next_op_number();

		info.opcode = free_opcode;
		info.var_type = loop_var->op_type;
		info.var_num = loop_var->u.op.var;
		brk_cont_element->start = start;
	} else {
		info.opcode = ZEND_NOP;
		/* The start field is used to free temporary variables in case of exceptions.
		 * We won't try to free something of we don't have loop variable.  */
		brk_cont_element->start = -1;
	}

	zend_stack_push(&CG(loop_var_stack), &info);
}
/* }}} */

static inline void zend_end_loop(int cont_addr, const znode *var_node) /* {{{ */
{
	uint32_t end = get_next_op_number();
	zend_brk_cont_element *brk_cont_element
		= &CG(context).brk_cont_array[CG(context).current_brk_cont];
	brk_cont_element->cont = cont_addr;
	brk_cont_element->brk = end;
	CG(context).current_brk_cont = brk_cont_element->parent;

	zend_stack_del_top(&CG(loop_var_stack));
}
/* }}} */

void zend_do_free(znode *op1) /* {{{ */
{
	if (op1->op_type == IS_TMP_VAR) {
		zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];

		while (opline->opcode == ZEND_END_SILENCE ||
		       opline->opcode == ZEND_OP_DATA) {
			opline--;
		}

		if (opline->result_type == IS_TMP_VAR && opline->result.var == op1->u.op.var) {
			switch (opline->opcode) {
				case ZEND_BOOL:
				case ZEND_BOOL_NOT:
					/* boolean resuls don't have to be freed */
					return;
				case ZEND_POST_INC_STATIC_PROP:
				case ZEND_POST_DEC_STATIC_PROP:
				case ZEND_POST_INC_OBJ:
				case ZEND_POST_DEC_OBJ:
				case ZEND_POST_INC:
				case ZEND_POST_DEC:
					/* convert $i++ to ++$i */
					opline->opcode -= 2;
					opline->result_type = IS_UNUSED;
					return;
				case ZEND_ASSIGN:
				case ZEND_ASSIGN_DIM:
				case ZEND_ASSIGN_OBJ:
				case ZEND_ASSIGN_STATIC_PROP:
				case ZEND_ASSIGN_OP:
				case ZEND_ASSIGN_DIM_OP:
				case ZEND_ASSIGN_OBJ_OP:
				case ZEND_ASSIGN_STATIC_PROP_OP:
				case ZEND_PRE_INC_STATIC_PROP:
				case ZEND_PRE_DEC_STATIC_PROP:
				case ZEND_PRE_INC_OBJ:
				case ZEND_PRE_DEC_OBJ:
				case ZEND_PRE_INC:
				case ZEND_PRE_DEC:
					opline->result_type = IS_UNUSED;
					return;
			}
		}

		zend_emit_op(NULL, ZEND_FREE, op1, NULL);
	} else if (op1->op_type == IS_VAR) {
		zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
		while (opline->opcode == ZEND_END_SILENCE ||
				opline->opcode == ZEND_EXT_FCALL_END ||
				opline->opcode == ZEND_OP_DATA) {
			opline--;
		}
		if (opline->result_type == IS_VAR
			&& opline->result.var == op1->u.op.var) {
			if (opline->opcode == ZEND_FETCH_THIS) {
				opline->opcode = ZEND_NOP;
				opline->result_type = IS_UNUSED;
			} else {
				opline->result_type = IS_UNUSED;
			}
		} else {
			while (opline >= CG(active_op_array)->opcodes) {
				if ((opline->opcode == ZEND_FETCH_LIST_R ||
                     opline->opcode == ZEND_FETCH_LIST_W) &&
				    opline->op1_type == IS_VAR &&
				    opline->op1.var == op1->u.op.var) {
					zend_emit_op(NULL, ZEND_FREE, op1, NULL);
					return;
				}
				if (opline->result_type == IS_VAR
					&& opline->result.var == op1->u.op.var) {
					if (opline->opcode == ZEND_NEW) {
						zend_emit_op(NULL, ZEND_FREE, op1, NULL);
					}
					break;
				}
				opline--;
			}
		}
	} else if (op1->op_type == IS_CONST) {
		/* Destroy value without using GC: When opcache moves arrays into SHM it will
		 * free the zend_array structure, so references to it from outside the op array
		 * become invalid. GC would cause such a reference in the root buffer. */
		zval_ptr_dtor_nogc(&op1->u.constant);
	}
}
/* }}} */

uint32_t zend_add_class_modifier(uint32_t flags, uint32_t new_flag) /* {{{ */
{
	uint32_t new_flags = flags | new_flag;
	if ((flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flag & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS)) {
		zend_throw_exception(zend_ce_compile_error,
			"Multiple abstract modifiers are not allowed", 0);
		return 0;
	}
	if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
		zend_throw_exception(zend_ce_compile_error, "Multiple final modifiers are not allowed", 0);
		return 0;
	}
	if ((new_flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flags & ZEND_ACC_FINAL)) {
		zend_throw_exception(zend_ce_compile_error,
			"Cannot use the final modifier on an abstract class", 0);
		return 0;
	}
	return new_flags;
}
/* }}} */

uint32_t zend_add_member_modifier(uint32_t flags, uint32_t new_flag) /* {{{ */
{
	uint32_t new_flags = flags | new_flag;
	if ((flags & ZEND_ACC_PPP_MASK) && (new_flag & ZEND_ACC_PPP_MASK)) {
		zend_throw_exception(zend_ce_compile_error,
			"Multiple access type modifiers are not allowed", 0);
		return 0;
	}
	if ((flags & ZEND_ACC_ABSTRACT) && (new_flag & ZEND_ACC_ABSTRACT)) {
		zend_throw_exception(zend_ce_compile_error, "Multiple abstract modifiers are not allowed", 0);
		return 0;
	}
	if ((flags & ZEND_ACC_STATIC) && (new_flag & ZEND_ACC_STATIC)) {
		zend_throw_exception(zend_ce_compile_error, "Multiple static modifiers are not allowed", 0);
		return 0;
	}
	if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
		zend_throw_exception(zend_ce_compile_error, "Multiple final modifiers are not allowed", 0);
		return 0;
	}
	if ((new_flags & ZEND_ACC_ABSTRACT) && (new_flags & ZEND_ACC_FINAL)) {
		zend_throw_exception(zend_ce_compile_error,
			"Cannot use the final modifier on an abstract class member", 0);
		return 0;
	}
	return new_flags;
}
/* }}} */

ZEND_API zend_string *zend_create_member_string(zend_string *class_name, zend_string *member_name) {
	return zend_string_concat3(
		ZSTR_VAL(class_name), ZSTR_LEN(class_name),
		"::", sizeof("::") - 1,
		ZSTR_VAL(member_name), ZSTR_LEN(member_name));
}

zend_string *zend_concat_names(char *name1, size_t name1_len, char *name2, size_t name2_len) {
	return zend_string_concat3(name1, name1_len, "\\", 1, name2, name2_len);
}

zend_string *zend_prefix_with_ns(zend_string *name) {
	if (FC(current_namespace)) {
		zend_string *ns = FC(current_namespace);
		return zend_concat_names(ZSTR_VAL(ns), ZSTR_LEN(ns), ZSTR_VAL(name), ZSTR_LEN(name));
	} else {
		return zend_string_copy(name);
	}
}

zend_string *zend_resolve_non_class_name(
	zend_string *name, uint32_t type, zend_bool *is_fully_qualified,
	zend_bool case_sensitive, HashTable *current_import_sub
) {
	char *compound;
	*is_fully_qualified = 0;

	if (ZSTR_VAL(name)[0] == '\\') {
		/* Remove \ prefix (only relevant if this is a string rather than a label) */
		*is_fully_qualified = 1;
		return zend_string_init(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 1, 0);
	}

	if (type == ZEND_NAME_FQ) {
		*is_fully_qualified = 1;
		return zend_string_copy(name);
	}

	if (type == ZEND_NAME_RELATIVE) {
		*is_fully_qualified = 1;
		return zend_prefix_with_ns(name);
	}

	if (current_import_sub) {
		/* If an unqualified name is a function/const alias, replace it. */
		zend_string *import_name;
		if (case_sensitive) {
			import_name = zend_hash_find_ptr(current_import_sub, name);
		} else {
			import_name = zend_hash_find_ptr_lc(current_import_sub, name);
		}

		if (import_name) {
			*is_fully_qualified = 1;
			return zend_string_copy(import_name);
		}
	}

	compound = memchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
	if (compound) {
		*is_fully_qualified = 1;
	}

	if (compound && FC(imports)) {
		/* If the first part of a qualified name is an alias, substitute it. */
		size_t len = compound - ZSTR_VAL(name);
		zend_string *import_name = zend_hash_str_find_ptr_lc(FC(imports), ZSTR_VAL(name), len);

		if (import_name) {
			return zend_concat_names(
				ZSTR_VAL(import_name), ZSTR_LEN(import_name), ZSTR_VAL(name) + len + 1, ZSTR_LEN(name) - len - 1);
		}
	}

	return zend_prefix_with_ns(name);
}
/* }}} */

zend_string *zend_resolve_function_name(zend_string *name, uint32_t type, zend_bool *is_fully_qualified) /* {{{ */
{
	return zend_resolve_non_class_name(
		name, type, is_fully_qualified, 0, FC(imports_function));
}
/* }}} */

zend_string *zend_resolve_const_name(zend_string *name, uint32_t type, zend_bool *is_fully_qualified) /* {{{ */ {
	return zend_resolve_non_class_name(
		name, type, is_fully_qualified, 1, FC(imports_const));
}
/* }}} */

zend_string *zend_resolve_class_name(zend_string *name, uint32_t type) /* {{{ */
{
	char *compound;

	if (type == ZEND_NAME_RELATIVE) {
		return zend_prefix_with_ns(name);
	}

	if (type == ZEND_NAME_FQ || ZSTR_VAL(name)[0] == '\\') {
		/* Remove \ prefix (only relevant if this is a string rather than a label) */
		if (ZSTR_VAL(name)[0] == '\\') {
			name = zend_string_init(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 1, 0);
		} else {
			zend_string_addref(name);
		}
		/* Ensure that \self, \parent and \static are not used */
		if (ZEND_FETCH_CLASS_DEFAULT != zend_get_class_fetch_type(name)) {
			zend_error_noreturn(E_COMPILE_ERROR, "'\\%s' is an invalid class name", ZSTR_VAL(name));
		}
		return name;
	}

	if (FC(imports)) {
		compound = memchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
		if (compound) {
			/* If the first part of a qualified name is an alias, substitute it. */
			size_t len = compound - ZSTR_VAL(name);
			zend_string *import_name =
				zend_hash_str_find_ptr_lc(FC(imports), ZSTR_VAL(name), len);

			if (import_name) {
				return zend_concat_names(
					ZSTR_VAL(import_name), ZSTR_LEN(import_name), ZSTR_VAL(name) + len + 1, ZSTR_LEN(name) - len - 1);
			}
		} else {
			/* If an unqualified name is an alias, replace it. */
			zend_string *import_name
				= zend_hash_find_ptr_lc(FC(imports), name);

			if (import_name) {
				return zend_string_copy(import_name);
			}
		}
	}

	/* If not fully qualified and not an alias, prepend the current namespace */
	return zend_prefix_with_ns(name);
}
/* }}} */

zend_string *zend_resolve_class_name_ast(zend_ast *ast) /* {{{ */
{
	zval *class_name = zend_ast_get_zval(ast);
	if (Z_TYPE_P(class_name) != IS_STRING) {
		zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
	}
	return zend_resolve_class_name(Z_STR_P(class_name), ast->attr);
}
/* }}} */

static void label_ptr_dtor(zval *zv) /* {{{ */
{
	efree_size(Z_PTR_P(zv), sizeof(zend_label));
}
/* }}} */

static void str_dtor(zval *zv)  /* {{{ */ {
	zend_string_release_ex(Z_STR_P(zv), 0);
}
/* }}} */

static zend_bool zend_is_call(zend_ast *ast);

static uint32_t zend_add_try_element(uint32_t try_op) /* {{{ */
{
	zend_op_array *op_array = CG(active_op_array);
	uint32_t try_catch_offset = op_array->last_try_catch++;
	zend_try_catch_element *elem;

	op_array->try_catch_array = safe_erealloc(
		op_array->try_catch_array, sizeof(zend_try_catch_element), op_array->last_try_catch, 0);

	elem = &op_array->try_catch_array[try_catch_offset];
	elem->try_op = try_op;
	elem->catch_op = 0;
	elem->finally_op = 0;
	elem->finally_end = 0;

	return try_catch_offset;
}
/* }}} */

ZEND_API void function_add_ref(zend_function *function) /* {{{ */
{
	if (function->type == ZEND_USER_FUNCTION) {
		zend_op_array *op_array = &function->op_array;

		if (op_array->refcount) {
			(*op_array->refcount)++;
		}
		if (op_array->static_variables
			&& !(GC_FLAGS(op_array->static_variables) & IS_ARRAY_IMMUTABLE)) {
			GC_ADDREF(op_array->static_variables);
		}

		if (CG(compiler_options) & ZEND_COMPILE_PRELOAD) {
			ZEND_ASSERT(op_array->fn_flags & ZEND_ACC_PRELOADED);
			ZEND_MAP_PTR_NEW(op_array->run_time_cache);
			ZEND_MAP_PTR_NEW(op_array->static_variables_ptr);
		} else {
			ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, &op_array->static_variables);
			ZEND_MAP_PTR_INIT(op_array->run_time_cache, zend_arena_alloc(&CG(arena), sizeof(void*)));
			ZEND_MAP_PTR_SET(op_array->run_time_cache, NULL);
		}
	}

	if (function->common.function_name) {
		zend_string_addref(function->common.function_name);
	}
}
/* }}} */

static zend_never_inline ZEND_COLD ZEND_NORETURN void do_bind_function_error(zend_string *lcname, zend_op_array *op_array, zend_bool compile_time) /* {{{ */
{
	zval *zv = zend_hash_find_ex(compile_time ? CG(function_table) : EG(function_table), lcname, 1);
	int error_level = compile_time ? E_COMPILE_ERROR : E_ERROR;
	zend_function *old_function;

	ZEND_ASSERT(zv != NULL);
	old_function = (zend_function*)Z_PTR_P(zv);
	if (old_function->type == ZEND_USER_FUNCTION
		&& old_function->op_array.last > 0) {
		zend_error_noreturn(error_level, "Cannot redeclare %s() (previously declared in %s:%d)",
					op_array ? ZSTR_VAL(op_array->function_name) : ZSTR_VAL(old_function->common.function_name),
					ZSTR_VAL(old_function->op_array.filename),
					old_function->op_array.opcodes[0].lineno);
	} else {
		zend_error_noreturn(error_level, "Cannot redeclare %s()",
			op_array ? ZSTR_VAL(op_array->function_name) : ZSTR_VAL(old_function->common.function_name));
	}
}

ZEND_API int do_bind_function(zval *lcname) /* {{{ */
{
	zend_function *function;
	zval *rtd_key, *zv;

	rtd_key = lcname + 1;
	zv = zend_hash_find_ex(EG(function_table), Z_STR_P(rtd_key), 1);
	if (UNEXPECTED(!zv)) {
		do_bind_function_error(Z_STR_P(lcname), NULL, 0);
		return FAILURE;
	}
	function = (zend_function*)Z_PTR_P(zv);
	zv = zend_hash_set_bucket_key(EG(function_table), (Bucket*)zv, Z_STR_P(lcname));
	if (UNEXPECTED(!zv)) {
		do_bind_function_error(Z_STR_P(lcname), &function->op_array, 0);
		return FAILURE;
	}
	return SUCCESS;
}
/* }}} */

ZEND_API int do_bind_class(zval *lcname, zend_string *lc_parent_name) /* {{{ */
{
	zend_class_entry *ce;
	zval *rtd_key, *zv;

	rtd_key = lcname + 1;

	zv = zend_hash_find_ex(EG(class_table), Z_STR_P(rtd_key), 1);

	if (UNEXPECTED(!zv)) {
		ce = zend_hash_find_ptr(EG(class_table), Z_STR_P(lcname));
		if (ce) {
			zend_error_noreturn(E_COMPILE_ERROR, "Cannot declare %s %s, because the name is already in use", zend_get_object_type(ce), ZSTR_VAL(ce->name));
			return FAILURE;
		} else {
			do {
				ZEND_ASSERT(EG(current_execute_data)->func->op_array.fn_flags & ZEND_ACC_PRELOADED);
				if (zend_preload_autoload
				  && zend_preload_autoload(EG(current_execute_data)->func->op_array.filename) == SUCCESS) {
					zv = zend_hash_find_ex(EG(class_table), Z_STR_P(rtd_key), 1);
					if (EXPECTED(zv != NULL)) {
						break;
					}
				}
				zend_error_noreturn(E_ERROR, "Class %s wasn't preloaded", Z_STRVAL_P(lcname));
				return FAILURE;
			} while (0);
		}
	}

	/* Register the derived class */
	ce = (zend_class_entry*)Z_PTR_P(zv);
	zv = zend_hash_set_bucket_key(EG(class_table), (Bucket*)zv, Z_STR_P(lcname));
	if (UNEXPECTED(!zv)) {
		zend_error_noreturn(E_COMPILE_ERROR, "Cannot declare %s %s, because the name is already in use", zend_get_object_type(ce), ZSTR_VAL(ce->name));
		return FAILURE;
	}

	if (zend_do_link_class(ce, lc_parent_name) == FAILURE) {
		/* Reload bucket pointer, the hash table may have been reallocated */
		zv = zend_hash_find(EG(class_table), Z_STR_P(lcname));
		zend_hash_set_bucket_key(EG(class_table), (Bucket *) zv, Z_STR_P(rtd_key));
		return FAILURE;
	}

	return SUCCESS;
}
/* }}} */

static zend_string *add_type_string(zend_string *type, zend_string *new_type) {
	zend_string *result;
	if (type == NULL) {
		return zend_string_copy(new_type);
	}

	result = zend_string_concat3(
		ZSTR_VAL(type), ZSTR_LEN(type), "|", 1, ZSTR_VAL(new_type), ZSTR_LEN(new_type));
	zend_string_release(type);
	return result;
}

static zend_string *resolve_class_name(zend_string *name, zend_class_entry *scope) {
	if (scope) {
		if (zend_string_equals_literal_ci(name, "self")) {
			name = scope->name;
		} else if (zend_string_equals_literal_ci(name, "parent") && scope->parent) {
			name = scope->parent->name;
		}
	}
	return name;
}

zend_string *zend_type_to_string_resolved(zend_type type, zend_class_entry *scope) {
	zend_string *str = NULL;
	if (ZEND_TYPE_HAS_LIST(type)) {
		zend_type *list_type;
		ZEND_TYPE_LIST_FOREACH(ZEND_TYPE_LIST(type), list_type) {
			if (ZEND_TYPE_HAS_CE(*list_type)) {
				str = add_type_string(str, ZEND_TYPE_CE(*list_type)->name);
			} else {
				str = add_type_string(str, resolve_class_name(ZEND_TYPE_NAME(*list_type), scope));
			}
		} ZEND_TYPE_LIST_FOREACH_END();
	} else if (ZEND_TYPE_HAS_NAME(type)) {
		str = zend_string_copy(resolve_class_name(ZEND_TYPE_NAME(type), scope));
	} else if (ZEND_TYPE_HAS_CE(type)) {
		str = zend_string_copy(ZEND_TYPE_CE(type)->name);
	}

	uint32_t type_mask = ZEND_TYPE_FULL_MASK(type);
	if (type_mask & MAY_BE_STATIC) {
		zend_string *name = ZSTR_KNOWN(ZEND_STR_STATIC);
		if (scope) {
			zend_class_entry *called_scope = zend_get_called_scope(EG(current_execute_data));
			if (called_scope) {
				name = called_scope->name;
			}
		}
		str = add_type_string(str, name);
	}
	if (type_mask & MAY_BE_CALLABLE) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_CALLABLE));
	}
	if (type_mask & MAY_BE_ITERABLE) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_ITERABLE));
	}
	if (type_mask & MAY_BE_OBJECT) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_OBJECT));
	}
	if (type_mask & MAY_BE_ARRAY) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_ARRAY));
	}
	if (type_mask & MAY_BE_STRING) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_STRING));
	}
	if (type_mask & MAY_BE_LONG) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_INT));
	}
	if (type_mask & MAY_BE_DOUBLE) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_FLOAT));
	}
	if ((type_mask & MAY_BE_BOOL) == MAY_BE_BOOL) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_BOOL));
	} else if (type_mask & MAY_BE_FALSE) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_FALSE));
	}
	if (type_mask & MAY_BE_VOID) {
		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_VOID));
	}

	if (type_mask & MAY_BE_NULL) {
		zend_bool is_union = !str || memchr(ZSTR_VAL(str), '|', ZSTR_LEN(str)) != NULL;
		if (!is_union) {
			zend_string *nullable_str = zend_string_concat2("?", 1, ZSTR_VAL(str), ZSTR_LEN(str));
			zend_string_release(str);
			return nullable_str;
		}

		str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_NULL_LOWERCASE));
	}
	return str;
}

ZEND_API zend_string *zend_type_to_string(zend_type type) {
	return zend_type_to_string_resolved(type, NULL);
}

static zend_bool is_generator_compatible_class_type(zend_string *name) {
	return zend_string_equals_literal_ci(name, "Traversable")
		|| zend_string_equals_literal_ci(name, "Iterator")
		|| zend_string_equals_literal_ci(name, "Generator");
}

static void zend_mark_function_as_generator() /* {{{ */
{
	if (!CG(active_op_array)->function_name) {
		zend_error_noreturn(E_COMPILE_ERROR,
			"The \"yield\" expression can only be used inside a function");
	}

	if (CG(active_op_array)->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
		zend_type return_type = CG(active_op_array)->arg_info[-1].type;
		zend_bool valid_type = (ZEND_TYPE_FULL_MASK(return_type) & MAY_BE_ITERABLE) != 0;
		if (!valid_type) {
			zend_type *single_type;
			ZEND_TYPE_FOREACH(return_type, single_type) {
				if (ZEND_TYPE_HAS_NAME(*single_type)
						&& is_generator_compatible_class_type(ZEND_TYPE_NAME(*single_type))) {
					valid_type = 1;
					break;
				}
			} ZEND_TYPE_FOREACH_END();
		}

		if (!valid_type) {
			zend_string *str = zend_type_to_string(return_type);
			zend_error_noreturn(E_COMPILE_ERROR,
				"Generators may only declare a return type containing " \
				"Generator, Iterator, Traversable, or iterable, %s is not permitted",
				ZSTR_VAL(str));
		}
	}

	CG(active_op_array)->fn_flags |= ZEND_ACC_GENERATOR;
}
/* }}} */

ZEND_API uint32_t zend_build_delayed_early_binding_list(const zend_op_array *op_array) /* {{{ */
{
	if (op_array->fn_flags & ZEND_ACC_EARLY_BINDING) {
		uint32_t  first_early_binding_opline = (uint32_t)-1;
		uint32_t *prev_opline_num = &first_early_binding_opline;
		zend_op  *opline = op_array->opcodes;
		zend_op  *end = opline + op_array->last;

		while (opline < end) {
			if (opline->opcode == ZEND_DECLARE_CLASS_DELAYED) {
				*prev_opline_num = opline - op_array->opcodes;
				prev_opline_num = &opline->result.opline_num;
			}
			++opline;
		}
		*prev_opline_num = -1;
		return first_early_binding_opline;
	}
	return (uint32_t)-1;
}
/* }}} */

ZEND_API void zend_do_delayed_early_binding(zend_op_array *op_array, uint32_t first_early_binding_opline) /* {{{ */
{
	if (first_early_binding_opline != (uint32_t)-1) {
		zend_bool orig_in_compilation = CG(in_compilation);
		uint32_t opline_num = first_early_binding_opline;
		void **run_time_cache;

		if (!ZEND_MAP_PTR(op_array->run_time_cache)) {
			void *ptr;

			ZEND_ASSERT(op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE);
			ptr = emalloc(op_array->cache_size + sizeof(void*));
			ZEND_MAP_PTR_INIT(op_array->run_time_cache, ptr);
			ptr = (char*)ptr + sizeof(void*);
			ZEND_MAP_PTR_SET(op_array->run_time_cache, ptr);
			memset(ptr, 0, op_array->cache_size);
		}
		run_time_cache = RUN_TIME_CACHE(op_array);

		CG(in_compilation) = 1;
		while (opline_num != (uint32_t)-1) {
			const zend_op *opline = &op_array->opcodes[opline_num];
			zval *lcname = RT_CONSTANT(opline, opline->op1);
			zval *zv = zend_hash_find_ex(EG(class_table), Z_STR_P(lcname + 1), 1);

			if (zv) {
				zend_class_entry *ce = Z_CE_P(zv);
				zend_string *lc_parent_name = Z_STR_P(RT_CONSTANT(opline, opline->op2));
				zend_class_entry *parent_ce = zend_hash_find_ex_ptr(EG(class_table), lc_parent_name, 1);

				if (parent_ce) {
					if (zend_try_early_bind(ce, parent_ce, Z_STR_P(lcname), zv)) {
						/* Store in run-time cache */
						((void**)((char*)run_time_cache + opline->extended_value))[0] = ce;
					}
				}
			}
			opline_num = op_array->opcodes[opline_num].result.opline_num;
		}
		CG(in_compilation) = orig_in_compilation;
	}
}
/* }}} */

ZEND_API zend_string *zend_mangle_property_name(const char *src1, size_t src1_length, const char *src2, size_t src2_length, int internal) /* {{{ */
{
	size_t prop_name_length = 1 + src1_length + 1 + src2_length;
	zend_string *prop_name = zend_string_alloc(prop_name_length, internal);

	ZSTR_VAL(prop_name)[0] = '\0';
	memcpy(ZSTR_VAL(prop_name) + 1, src1, src1_length+1);
	memcpy(ZSTR_VAL(prop_name) + 1 + src1_length + 1, src2, src2_length+1);
	return prop_name;
}
/* }}} */

static zend_always_inline size_t zend_strnlen(const char* s, size_t maxlen) /* {{{ */
{
	size_t len = 0;
	while (*s++ && maxlen--) len++;
	return len;
}
/* }}} */

ZEND_API int zend_unmangle_property_name_ex(const zend_string *name, const char **class_name, const char **prop_name, size_t *prop_len) /* {{{ */
{
	size_t class_name_len;
	size_t anonclass_src_len;

	*class_name = NULL;

	if (!ZSTR_LEN(name) || ZSTR_VAL(name)[0] != '\0') {
		*prop_name = ZSTR_VAL(name);
		if (prop_len) {
			*prop_len = ZSTR_LEN(name);
		}
		return SUCCESS;
	}
	if (ZSTR_LEN(name) < 3 || ZSTR_VAL(name)[1] == '\0') {
		zend_error(E_NOTICE, "Illegal member variable name");
		*prop_name = ZSTR_VAL(name);
		if (prop_len) {
			*prop_len = ZSTR_LEN(name);
		}
		return FAILURE;
	}

	class_name_len = zend_strnlen(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 2);
	if (class_name_len >= ZSTR_LEN(name) - 2 || ZSTR_VAL(name)[class_name_len + 1] != '\0') {
		zend_error(E_NOTICE, "Corrupt member variable name");
		*prop_name = ZSTR_VAL(name);
		if (prop_len) {
			*prop_len = ZSTR_LEN(name);
		}
		return FAILURE;
	}

	*class_name = ZSTR_VAL(name) + 1;
	anonclass_src_len = zend_strnlen(*class_name + class_name_len + 1, ZSTR_LEN(name) - class_name_len - 2);
	if (class_name_len + anonclass_src_len + 2 != ZSTR_LEN(name)) {
		class_name_len += anonclass_src_len + 1;
	}
	*prop_name = ZSTR_VAL(name) + class_name_len + 2;
	if (prop_len) {
		*prop_len = ZSTR_LEN(name) - class_name_len - 2;
	}
	return SUCCESS;
}
/* }}} */

static zend_bool can_ct_eval_const(zend_constant *c) {
	if (ZEND_CONSTANT_FLAGS(c) & CONST_DEPRECATED) {
		return 0;
	}
	if ((ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT)
			&& !(CG(compiler_options) & ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION)
			&& !((ZEND_CONSTANT_FLAGS(c) & CONST_NO_FILE_CACHE)
				&& (CG(compiler_options) & ZEND_COMPILE_WITH_FILE_CACHE))) {
		return 1;
	}
	if (Z_TYPE(c->value) < IS_OBJECT
			&& !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION)) {
		return 1;
	}
	return 0;
}

static zend_bool zend_try_ct_eval_const(zval *zv, zend_string *name, zend_bool is_fully_qualified) /* {{{ */
{
	zend_constant *c = zend_hash_find_ptr(EG(zend_constants), name);
	if (c && can_ct_eval_const(c)) {
		ZVAL_COPY_OR_DUP(zv, &c->value);
		return 1;
	}

	{
		/* Substitute true, false and null (including unqualified usage in namespaces) */
		const char *lookup_name = ZSTR_VAL(name);
		size_t lookup_len = ZSTR_LEN(name);

		if (!is_fully_qualified) {
			zend_get_unqualified_name(name, &lookup_name, &lookup_len);
		}

		if ((c = zend_get_special_const(lookup_name, lookup_len))) {
			ZVAL_COPY_VALUE(zv, &c->value);
			return 1;
		}

		return 0;
	}
}
/* }}} */

static inline zend_bool zend_is_scope_known() /* {{{ */
{
	if (CG(active_op_array)->fn_flags & ZEND_ACC_CLOSURE) {
		/* Closures can be rebound to a different scope */
		return 0;
	}

	if (!CG(active_class_entry)) {
		/* The scope is known if we're in a free function (no scope), but not if we're in
		 * a file/eval (which inherits including/eval'ing scope). */
		return CG(active_op_array)->function_name != NULL;
	}

	/* For traits self etc refers to the using class, not the trait itself */
	return (CG(active_class_entry)->ce_flags & ZEND_ACC_TRAIT) == 0;
}
/* }}} */

static inline zend_bool class_name_refers_to_active_ce(zend_string *class_name, uint32_t fetch_type) /* {{{ */
{
	if (!CG(active_class_entry)) {
		return 0;
	}
	if (fetch_type == ZEND_FETCH_CLASS_SELF && zend_is_scope_known()) {
		return 1;
	}
	return fetch_type == ZEND_FETCH_CLASS_DEFAULT
		&& zend_string_equals_ci(class_name, CG(active_class_entry)->name);
}
/* }}} */

uint32_t zend_get_class_fetch_type(zend_string *name) /* {{{ */
{
	if (zend_string_equals_literal_ci(name, "self")) {
		return ZEND_FETCH_CLASS_SELF;
	} else if (zend_string_equals_literal_ci(name, "parent")) {
		return ZEND_FETCH_CLASS_PARENT;
	} else if (zend_string_equals_literal_ci(name, "static")) {
		return ZEND_FETCH_CLASS_STATIC;
	} else {
		return ZEND_FETCH_CLASS_DEFAULT;
	}
}
/* }}} */

static uint32_t zend_get_class_fetch_type_ast(zend_ast *name_ast) /* {{{ */
{
	/* Fully qualified names are always default refs */
	if (name_ast->attr == ZEND_NAME_FQ) {
		return ZEND_FETCH_CLASS_DEFAULT;
	}

	return zend_get_class_fetch_type(zend_ast_get_str(name_ast));
}
/* }}} */

static zend_string *zend_resolve_const_class_name_reference(zend_ast *ast, const char *type)
{
	zend_string *class_name = zend_ast_get_str(ast);
	if (ZEND_FETCH_CLASS_DEFAULT != zend_get_class_fetch_type_ast(ast)) {
		zend_error_noreturn(E_COMPILE_ERROR,
			"Cannot use '%s' as %s, as it is reserved",
			ZSTR_VAL(class_name), type);
	}
	return zend_resolve_class_name(class_name, ast->attr);
}

static void zend_ensure_valid_class_fetch_type(uint32_t fetch_type) /* {{{ */
{
	if (fetch_type != ZEND_FETCH_CLASS_DEFAULT && zend_is_scope_known()) {
		zend_class_entry *ce = CG(active_class_entry);
		if (!ce) {
			zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"%s\" when no class scope is active",
				fetch_type == ZEND_FETCH_CLASS_SELF ? "self" :
				fetch_type == ZEND_FETCH_CLASS_PARENT ? "parent" : "static");
		} else if (fetch_type == ZEND_FETCH_CLASS_PARENT && !ce->parent_name) {
			zend_error_noreturn(E_COMPILE_ERROR,
				"Cannot use \"parent\" when current class scope has no parent");
		}
	}
}
/* }}} */

static zend_bool zend_try_compile_const_expr_resolve_class_name(zval *zv, zend_ast *class_ast) /* {{{ */
{
	uint32_t fetch_type;
	zval *class_name;

	if (class_ast->kind != ZEND_AST_ZVAL) {
		return 0;
	}

	class_name = zend_ast_get_zval(class_ast);

	if (Z_TYPE_P(class_name) != IS_STRING) {
		zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
	}

	fetch_type = zend_get_class_fetch_type(Z_STR_P(class_name));
	zend_ensure_valid_class_fetch_type(fetch_type);

	switch (fetch_type) {
		case ZEND_FETCH_CLASS_SELF:
			if (CG(active_class_entry) && zend_is_scope_known()) {
				ZVAL_STR_COPY(zv, CG(active_class_entry)->name);
				return 1;
			}
			return 0;
		case ZEND_FETCH_CLASS_PARENT:
			if (CG(active_class_entry) && CG(active_class_entry)->parent_name
					&& zend_is_scope_known()) {
				ZVAL_STR_COPY(zv, CG(active_class_entry)->parent_name);
				return 1;
			}
			return 0;
		case ZEND_FETCH_CLASS_STATIC:
			return 0;
		case ZEND_FETCH_CLASS_DEFAULT:
			ZVAL_STR(zv, zend_resolve_class_name_ast(class_ast));
			return 1;
		EMPTY_SWITCH_DEFAULT_CASE()
	}
}
/* }}} */

/* We don't use zend_verify_const_access because we need to deal with unlinked classes. */
static zend_bool zend_verify_ct_const_access(zend_class_constant *c, zend_class_entry *scope)
{
	if (Z_ACCESS_FLAGS(c->value) & ZEND_ACC_PUBLIC) {
		return 1;
	} else if (Z_ACCESS_FLAGS(c->value) & ZEND_ACC_PRIVATE) {
		return c->ce == scope;
	} else {
		zend_class_entry *ce = c->ce;
		while (1) {
			if (ce == scope) {
				return 1;
			}
			if (!ce->parent) {
				break;
			}
			if (ce->ce_flags & ZEND_ACC_RESOLVED_PARENT) {
				ce = ce->parent;
			} else {
				ce = zend_hash_find_ptr_lc(CG(class_table), ce->parent_name);
				if (!ce) {
					break;
				}
			}
		}
		/* Reverse case cannot be true during compilation */
		return 0;
	}
}

static zend_bool zend_try_ct_eval_class_const(zval *zv, zend_string *class_name, zend_string *name) /* {{{ */
{
	uint32_t fetch_type = zend_get_class_fetch_type(class_name);
	zend_class_constant *cc;
	zval *c;

	if (class_name_refers_to_active_ce(class_name, fetch_type)) {
		cc = zend_hash_find_ptr(&CG(active_class_entry)->constants_table, name);
	} else if (fetch_type == ZEND_FETCH_CLASS_DEFAULT && !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION)) {
		zend_class_entry *ce = zend_hash_find_ptr_lc(CG(class_table), class_name);
		if (ce) {
			cc = zend_hash_find_ptr(&ce->constants_table, name);
		} else {
			return 0;
		}
	} else {
		return 0;
	}

	if (CG(compiler_options) & ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION) {
		return 0;
	}

	if (!cc || !zend_verify_ct_const_access(cc, CG(active_class_entry))) {
		return 0;
	}

	c = &cc->value;

	/* Substitute case-sensitive (or lowercase) persistent class constants */
	if (Z_TYPE_P(c) < IS_OBJECT) {
		ZVAL_COPY_OR_DUP(zv, c);
		return 1;
	}

	return 0;
}
/* }}} */

static void zend_add_to_list(void *result, void *item) /* {{{ */
{
	void** list = *(void**)result;
	size_t n = 0;

	if (list) {
		while (list[n]) {
			n++;
		}
	}

	list = erealloc(list, sizeof(void*) * (n+2));

	list[n]   = item;
	list[n+1] = NULL;

	*(void**)result = list;
}
/* }}} */

void zend_do_extended_stmt(void) /* {{{ */
{
	zend_op *opline;

	if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_STMT)) {
		return;
	}

	opline = get_next_op();

	opline->opcode = ZEND_EXT_STMT;
}
/* }}} */

void zend_do_extended_fcall_begin(void) /* {{{ */
{
	zend_op *opline;

	if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_FCALL)) {
		return;
	}

	opline = get_next_op();

	opline->opcode = ZEND_EXT_FCALL_BEGIN;
}
/* }}} */

void zend_do_extended_fcall_end(void) /* {{{ */
{
	zend_op *opline;

	if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_FCALL)) {
		return;
	}

	opline = get_next_op();

	opline->opcode = ZEND_EXT_FCALL_END;
}
/* }}} */

zend_bool zend_is_auto_global_str(char *name, size_t len) /* {{{ */ {
	zend_auto_global *auto_global;

	if ((auto_global = zend_hash_str_find_ptr(CG(auto_globals), name, len)) != NULL) {
		if (auto_global->armed) {
			auto_global->armed = auto_global->auto_global_callback(auto_global->name);
		}
		return 1;
	}
	return 0;
}
/* }}} */

zend_bool zend_is_auto_global(zend_string *name) /* {{{ */
{
	zend_auto_global *auto_global;

	if ((auto_global = zend_hash_find_ptr(CG(auto_globals), name)) != NULL) {
		if (auto_global->armed) {
			auto_global->armed = auto_global->auto_global_callback(auto_global->name);
		}
		return 1;
	}
	return 0;
}
/* }}} */

int zend_register_auto_global(zend_string *name, zend_bool jit, z…