Provide compiler hook for altering the AST pre-compilation.

Author: sgolemon

Zend/zend_ast.c

@@ -23,6 +23,8 @@
 #include "zend_API.h"
 #include "zend_operators.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);
 }

Zend/zend_ast.h

@@ -186,6 +186,9 @@ typedef struct _zend_ast_decl {
 	zend_ast *child[3];
 } zend_ast_decl;
 
+typedef void (*zend_ast_process_t)(zend_ast *ast);
+extern zend_ast_process_t zend_ast_process;
+
 ZEND_API zend_ast *zend_ast_create_zval_ex(zval *zv, zend_ast_attr attr);
 
 ZEND_API zend_ast *zend_ast_create_ex(zend_ast_kind kind, zend_ast_attr attr, ...);