Added concept of interned strings. All strings constants known at compile time are allocated in a single copy and never changed.

1 files changed, 12 insertions, 0 deletions

diff --git a/Zend/zend_globals.h b/Zend/zend_globals.h
index 368e88ec39..19be67d1de 100644
--- a/Zend/zend_globals.h
+++ b/Zend/zend_globals.h
@@ -140,6 +140,18 @@ struct _zend_compiler_globals {
 	HashTable *labels;
 	zend_stack labels_stack;
 
+	/* interned strings */
+	char *interned_strings_start;
+	char *interned_strings_end;
+	char *interned_strings_top;
+	char *interned_strings_snapshot_top;
+
+	HashTable interned_strings;
+
+	char *(*new_interned_string)(char *str, int len, int free_src TSRMLS_DC);
+	void (*interned_strings_snapshot)(TSRMLS_D);
+	void (*interned_strings_restore)(TSRMLS_D);
+
 #ifdef ZEND_MULTIBYTE
 	zend_encoding **script_encoding_list;
 	size_t script_encoding_list_size;