[V8] Removed SourceLocationRestrict

This method uses in messages.js in GetSourceLine and GetPositionInLine. This methods uses in v8::Message API methods and there is no documentation about it.
Method looks obsolete.
One of the strange side effect is shown by attached issue.

BUG=chromium:468781
R=yangguo@chromium.org
LOG=Y

Review URL: https://codereview.chromium.org/1022333004

Cr-Commit-Position: refs/heads/master@{#27374}

src/messages.js

@@ -352,7 +352,6 @@ function GetSourceLine(message) {
   var start_position = %MessageGetStartPosition(message);
   var location = script.locationFromPosition(start_position, true);
   if (location == null) return "";
-  location.restrict();
   return location.sourceText();
 }
 
@@ -653,57 +652,6 @@ function SourceLocation(script, position, line, column, start, end) {
   this.end = end;
 }
 
-var kLineLengthLimit = 78;
-
-/**
- * Restrict source location start and end positions to make the source slice
- * no more that a certain number of characters wide.
- * @param {number} opt_limit The with limit of the source text with a default
- *     of 78
- * @param {number} opt_before The number of characters to prefer before the
- *     position with a default value of 10 less that the limit
- */
-function SourceLocationRestrict(opt_limit, opt_before) {
-  // Find the actual limit to use.
-  var limit;
-  var before;
-  if (!IS_UNDEFINED(opt_limit)) {
-    limit = opt_limit;
-  } else {
-    limit = kLineLengthLimit;
-  }
-  if (!IS_UNDEFINED(opt_before)) {
-    before = opt_before;
-  } else {
-    // If no before is specified center for small limits and perfer more source
-    // before the the position that after for longer limits.
-    if (limit <= 20) {
-      before = $floor(limit / 2);
-    } else {
-      before = limit - 10;
-    }
-  }
-  if (before >= limit) {
-    before = limit - 1;
-  }
-
-  // If the [start, end[ interval is too big we restrict
-  // it in one or both ends. We make sure to always produce
-  // restricted intervals of maximum allowed size.
-  if (this.end - this.start > limit) {
-    var start_limit = this.position - before;
-    var end_limit = this.position + limit - before;
-    if (this.start < start_limit && end_limit < this.end) {
-      this.start = start_limit;
-      this.end = end_limit;
-    } else if (this.start < start_limit) {
-      this.start = this.end - limit;
-    } else {
-      this.end = this.start + limit;
-    }
-  }
-}
-
 
 /**
  * Get the source text for a SourceLocation
@@ -721,7 +669,6 @@ function SourceLocationSourceText() {
 SetUpLockedPrototype(SourceLocation,
   $Array("script", "position", "line", "column", "start", "end"),
   $Array(
-    "restrict", SourceLocationRestrict,
     "sourceText", SourceLocationSourceText
  )
 );
@@ -778,7 +725,6 @@ function GetPositionInLine(message) {
   var start_position = %MessageGetStartPosition(message);
   var location = script.locationFromPosition(start_position, false);
   if (location == null) return -1;
-  location.restrict();
   return start_position - location.start;
 }
 

test/mjsunit/debug-sourceinfo.js

@@ -63,9 +63,9 @@ var comment_lines = 28;
 
 // This is the last position in the entire file (note: this equals
 // file size of <debug-sourceinfo.js> - 1, since starting at 0).
-var last_position = 13890;
+var last_position = 11337;
 // This is the last line of entire file (note: starting at 0).
-var last_line = 350;
+var last_line = 265;
 // This is the last column of last line (note: starting at 0 and +1, due
 // to trailing <LF>).
 var last_column = 1;
@@ -257,94 +257,9 @@ assertEquals(last_position, script.locationFromPosition(last_position).position)
 assertEquals(last_line, script.locationFromPosition(last_position).line);
 assertEquals(last_column, script.locationFromPosition(last_position).column);
 
-// Test source line and restriction. All the following tests start from line 1
-// column 2 in function b, which is the call to c.
-//   c(true);
-//   ^
-
+// Test that script.sourceLine(line) works.
 var location;
 
-location = script.locationFromLine(1, 0, start_b);
-assertEquals('  c(true);', location.sourceText());
-
-result = ['c', ' c', ' c(', '  c(', '  c(t']
-for (var i = 1; i <= 5; i++) {
-  location = script.locationFromLine(1, 2, start_b);
-  location.restrict(i);
-  assertEquals(result[i - 1], location.sourceText());
-}
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(1, 0);
-assertEquals('c', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(2, 0);
-assertEquals('c(', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(2, 1);
-assertEquals(' c', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(2, 2);
-assertEquals(' c', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(2, 3);
-assertEquals(' c', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(3, 1);
-assertEquals(' c(', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(5, 0);
-assertEquals('c(tru', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(5, 2);
-assertEquals('  c(t', location.sourceText());
-
-location = script.locationFromLine(1, 2, start_b);
-location.restrict(5, 4);
-assertEquals('  c(t', location.sourceText());
-
-// All the following tests start from line 1 column 10 in function b, which is
-// the final character.
-//   c(true);
-//          ^
-
-location = script.locationFromLine(1, 10, start_b);
-location.restrict(5, 0);
-assertEquals('rue);', location.sourceText());
-
-location = script.locationFromLine(1, 10, start_b);
-location.restrict(7, 0);
-assertEquals('(true);', location.sourceText());
-
-// All the following tests start from line 1 column 0 in function b, which is
-// the first character.
-//   c(true);
-//^
-
-location = script.locationFromLine(1, 0, start_b);
-location.restrict(5, 0);
-assertEquals('  c(t', location.sourceText());
-
-location = script.locationFromLine(1, 0, start_b);
-location.restrict(5, 4);
-assertEquals('  c(t', location.sourceText());
-
-location = script.locationFromLine(1, 0, start_b);
-location.restrict(7, 0);
-assertEquals('  c(tru', location.sourceText());
-
-location = script.locationFromLine(1, 0, start_b);
-location.restrict(7, 6);
-assertEquals('  c(tru', location.sourceText());
-
-// Test that script.sourceLine(line) works.
 for (line = 0; line < num_lines_d; line++) {
   var line_content_regexp = new RegExp("  x = " + (line + 1));
   assertTrue(line_content_regexp.test(script.sourceLine(start_line_d + line)));