GDB: apply ast pretty printing to specialized structures (php#17884)

The `ZendAstPrettyPrinter` had logic to handle the various structures that are
based on `zend_ast`, like `zend_ast_decl`, but the printer was only installed
when the value was a `zend_ast`, meaning that for the specialized structures
the details wouldn't be shown unless they were cast (in GDB) to `zend_ast`.
Instead, just register the printer for the specialized structures too.

Author: DanielEScherzer

main/debug_gdb_scripts.c

@@ -826,7 +826,11 @@ asm(
     ".ascii \"pp_set.add_printer('zend_ast_kind', '^zend_ast_kind$', ZendAstKindPrettyPrinter)\\n\"\n"
     ".ascii \"\\n\"\n"
     ".ascii \"class ZendAstPrettyPrinter(gdb.printing.PrettyPrinter):\\n\"\n"
-    ".ascii \"    \\\"Print a zend_ast\\\"\\n\"\n"
+    ".ascii \"    \\\"\\\"\\\"\\n\"\n"
+    ".ascii \"        Print a zend_ast, or one of the specialized structures based on it:\\n\"\n"
+    ".ascii \"        zend_ast_decl, zend_ast_list, zend_ast_op_array, zend_ast_zval, or\\n\"\n"
+    ".ascii \"        zend_ast_znode\\n\"\n"
+    ".ascii \"    \\\"\\\"\\\"\\n\"\n"
     ".ascii \"\\n\"\n"
     ".ascii \"    def __init__(self, val):\\n\"\n"
     ".ascii \"        self.val = val\\n\"\n"
@@ -899,6 +903,11 @@ asm(
     ".ascii \"\\n\"\n"
     ".ascii \"\\n\"\n"
     ".ascii \"pp_set.add_printer('zend_ast', '^_zend_ast$', ZendAstPrettyPrinter)\\n\"\n"
+    ".ascii \"pp_set.add_printer('zend_ast_decl', '^_zend_ast_decl$', ZendAstPrettyPrinter)\\n\"\n"
+    ".ascii \"pp_set.add_printer('zend_ast_list', '^_zend_ast_list$', ZendAstPrettyPrinter)\\n\"\n"
+    ".ascii \"pp_set.add_printer('zend_ast_op_array', '^_zend_ast_op_array$', ZendAstPrettyPrinter)\\n\"\n"
+    ".ascii \"pp_set.add_printer('zend_ast_zval', '^_zend_ast_zval$', ZendAstPrettyPrinter)\\n\"\n"
+    ".ascii \"pp_set.add_printer('zend_ast_znode', '^_zend_ast_znode$', ZendAstPrettyPrinter)\\n\"\n"
     ".ascii \"\\n\"\n"
     ".ascii \"class ZvalPrettyPrinter(gdb.printing.PrettyPrinter):\\n\"\n"
     ".ascii \"    \\\"Print a zval\\\"\\n\"\n"

scripts/gdb/php_gdb.py

@@ -156,7 +156,11 @@ def to_string(self):
 pp_set.add_printer('zend_ast_kind', '^zend_ast_kind$', ZendAstKindPrettyPrinter)
 
 class ZendAstPrettyPrinter(gdb.printing.PrettyPrinter):
-    "Print a zend_ast"
+    """
+        Print a zend_ast, or one of the specialized structures based on it:
+        zend_ast_decl, zend_ast_list, zend_ast_op_array, zend_ast_zval, or
+        zend_ast_znode
+    """
 
     def __init__(self, val):
         self.val = val
@@ -229,6 +233,11 @@ def num_children(self):
 
 
 pp_set.add_printer('zend_ast', '^_zend_ast$', ZendAstPrettyPrinter)
+pp_set.add_printer('zend_ast_decl', '^_zend_ast_decl$', ZendAstPrettyPrinter)
+pp_set.add_printer('zend_ast_list', '^_zend_ast_list$', ZendAstPrettyPrinter)
+pp_set.add_printer('zend_ast_op_array', '^_zend_ast_op_array$', ZendAstPrettyPrinter)
+pp_set.add_printer('zend_ast_zval', '^_zend_ast_zval$', ZendAstPrettyPrinter)
+pp_set.add_printer('zend_ast_znode', '^_zend_ast_znode$', ZendAstPrettyPrinter)
 
 class ZvalPrettyPrinter(gdb.printing.PrettyPrinter):
     "Print a zval"