Revision: 18610
Author: [email protected]
Date: Wed Jan 15 09:31:26 2014 UTC
Log: Experimental parser: elide cursor reads in some cases
[email protected]
BUG=
Review URL: https://codereview.chromium.org/139303002
http://code.google.com/p/v8/source/detail?r=18610
Modified:
/branches/experimental/parser/tools/lexer_generator/code_generator.jinja
/branches/experimental/parser/tools/lexer_generator/code_generator.py
=======================================
---
/branches/experimental/parser/tools/lexer_generator/code_generator.jinja
Wed Jan 15 09:00:41 2014 UTC
+++
/branches/experimental/parser/tools/lexer_generator/code_generator.jinja
Wed Jan 15 09:31:26 2014 UTC
@@ -205,7 +205,9 @@
{{ write_label('state_entry', node_number_chain) }}
- READ_CURSOR();
+ {% if not state['can_elide_read'] -%}
+ READ_CURSOR();
+ {%- endif -%}
{% if debug_print %}
fprintf(stderr,
=======================================
--- /branches/experimental/parser/tools/lexer_generator/code_generator.py
Tue Jan 14 10:36:59 2014 UTC
+++ /branches/experimental/parser/tools/lexer_generator/code_generator.py
Wed Jan 15 09:31:26 2014 UTC
@@ -99,6 +99,7 @@
'node_number' : None,
'original_node_number' : state.node_number(),
'transitions' : transitions,
+ 'can_elide_read' : len(transitions) == 0,
'switch_transitions' : [],
'deferred_transitions' : [],
'long_char_transitions' : [],
@@ -286,6 +287,9 @@
state['match_action'] = (state['match_action'][0], value)
if state['match_action'][0] != 'goto_start':
states[value[-1]]['entry_points']['after_entry_code'] = True
+ state['can_elide_read'] = False
+ else:
+ states[value[-1]]['can_elide_read'] = False
@staticmethod
def __mark_entry_points(dfa_states):
--
--
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