Revision: 18584
Author: dcar...@chromium.org
Date: Tue Jan 14 13:01:46 2014 UTC
Log: Experimental parser: cleanup cursing
TBR=ma...@chromium.org
BUG=
Review URL: https://codereview.chromium.org/138013003
http://code.google.com/p/v8/source/detail?r=18584
Modified:
/branches/experimental/parser/tools/lexer_generator/code_generator.jinja
=======================================
---
/branches/experimental/parser/tools/lexer_generator/code_generator.jinja
Tue Jan 14 12:22:39 2014 UTC
+++
/branches/experimental/parser/tools/lexer_generator/code_generator.jinja
Tue Jan 14 13:01:46 2014 UTC
@@ -74,12 +74,12 @@
{% elif type == 'set_marker' %}
marker_ = cursor_ - {{value}};
{% elif type == 'set_has_escapes' %}
- next_.has_escapes = true;
+ next_.has_escapes = true;
{% elif type == 'octal_inside_string' %}
- last_octal_end_ = cursor_;
- next_.has_escapes = true;
+ last_octal_end_ = cursor_;
+ next_.has_escapes = true;
{% elif type == 'line_terminator_in_multiline_comment' %}
- has_multiline_comment_before_next_ = true;
+ has_multiline_comment_before_next_ = true;
{% elif type == 'check_escaped_identifier_start' %}
if (!ValidIdentifierStart()) goto default_action;
next_.has_escapes = true;
@@ -99,22 +99,20 @@
{#- match actions must all explicitly jump or return -#}
{% macro dispatch_match_action(type, value) -%}
{% if type == 'terminate' %}
- DO_EOS();
- return;
+ {{dispatch_match_action('backtrack', ('1', 'EOS'))}}
{% elif type == 'terminate_illegal' %}
start_ = marker_;
- BACKWARD(1);
- DO_TOKEN(Token::ILLEGAL);
- return;
+ {{dispatch_match_action('backtrack', ('1', 'ILLEGAL'))}}
{% elif type == 'skip' %}
- SKIP();
+ RESET_START();
goto state_entry_0;
{% elif type == 'skip_and_terminate' %}
- SKIP();
+ RESET_START();
--start_;
{{dispatch_match_action('terminate', None)}}
{% elif type == 'line_terminator' %}
- DO_LINE_TERMINATOR();
+ RESET_START();
+ has_line_terminator_before_next_ = true;
goto state_entry_0;
{% elif type == 'token' %}
DO_TOKEN(Token::{{value}})
@@ -128,7 +126,9 @@
DO_TOKEN(stored_token)
return;
{% elif type == 'do_token_and_go_forward' %}
- DO_TOKEN_AND_GO_FORWARD(Token::{{value}})
+ DO_TOKEN(Token::{{value}});
+ FORWARD();
+ RESET_START();
return;
{% elif type == 'harmony_token' %}
if (harmony_{{value[0]}}_) {
@@ -282,48 +282,31 @@
#include "lexer/experimental-scanner.h"
-#define PREPARE_TOKEN() { \
- next_.beg_pos = start_ - buffer_; \
- next_.end_pos = cursor_ - buffer_; \
+#define RESET_START() { \
start_ = cursor_; \
}
#define DO_TOKEN(T) { \
- PREPARE_TOKEN(); \
+ next_.beg_pos = start_ - buffer_; \
+ next_.end_pos = cursor_ - buffer_; \
next_.token = T; \
-}
-
-#define DO_TOKEN_AND_GO_FORWARD(T) { \
- PREPARE_TOKEN(); \
- FORWARD(); \
- next_.token = T; \
- start_ = cursor_; \
-}
-
-#define DO_EOS() { \
- cursor_ -= 1; \
- DO_TOKEN(Token::EOS); \
-}
-
-#define DO_LINE_TERMINATOR(s) { \
- start_ = cursor_; \
- has_line_terminator_before_next_ = true; \
+ RESET_START(); \
}
#define FORWARD() { \
- if (++cursor_ >= buffer_end_) primary_char = 0; \
- else primary_char = *(cursor_); \
+ cursor_++; \
+ READ_CURSOR(); \
}
#define BACKWARD(n) { \
cursor_ -= n; \
+ READ_CURSOR(); \
+}
+
+#define READ_CURSOR() { \
if (cursor_ >= buffer_end_) primary_char = 0; \
else primary_char = *(cursor_); \
}
-
-#define SKIP() { \
- start_ = cursor_; \
-}
#ifdef DEBUG
#define CRASH() { ((void(*)())0)(); }
@@ -335,12 +318,12 @@
namespace internal {
template<>
void ExperimentalScanner<{{char_type}}>::Scan() {
+
+ // Setup environment.
next_.has_escapes = false;
- // Setup environment.
Token::Value stored_token;
{{char_type}} primary_char;
- if (cursor_ >= buffer_end_) primary_char = 0;
- else primary_char = *(cursor_);
+ READ_CURSOR();
{# first node is start node #}
{% for dfa_state in dfa_states -%}
--
--
v8-dev mailing list
v8-dev@googlegroups.com
http://groups.google.com/group/v8-dev
---
You received this message because you are subscribed to the Google Groups "v8-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to v8-dev+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
