// Copyright 2016 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Flags: --allow-natives-syntax function get_thin_string(a, b) { var str = a + b; // Make a ConsString. var o = {}; o[str]; // Turn it into a ThinString. return str; } var str = get_thin_string("foo", "bar"); var re = /.o+ba./; assertEquals(["foobar"], re.exec(str)); assertEquals(["foobar"], re.exec(str)); assertEquals(["foobar"], re.exec(str)); function CheckCS() { assertEquals("o", str.substring(1, 2)); assertEquals("f".charCodeAt(0), str.charCodeAt(0)); assertEquals("f", str.split(/oo/)[0]); }; %PrepareFunctionForOptimization(CheckCS); CheckCS(); %OptimizeFunctionOnNextCall(CheckCS); CheckCS(); function CheckTF() { try { } catch (e) { } // Turbofan. assertEquals("o", str.substring(1, 2)); assertEquals("f".charCodeAt(0), str.charCodeAt(0)); assertEquals("f", str.split(/oo/)[0]); }; %PrepareFunctionForOptimization(CheckTF); CheckTF(); %OptimizeFunctionOnNextCall(CheckTF); CheckTF(); // Flat cons strings can point to a thin string. function get_cons_thin_string(a, b) { // Make a ConsString. var s = a + b; // Flatten it. s.endsWith("a"); // Internalize the first part. var o = {}; o[s]; return s; } var s = get_cons_thin_string("__________", "@@@@@@@@@@a"); s.match(/.*a/); assertEquals("________", s.substring(0, 8)); function cc1(s) { assertEquals(95, s.charCodeAt(0)); assertEquals(95, s.codePointAt(0)); }; %PrepareFunctionForOptimization(cc1); cc1(s); cc1(s); %OptimizeFunctionOnNextCall(cc1); cc1(s); // Sliced strings can have a thin string as their parent. function get_sliced_thin_string(a, b) { // Make a long thin string. var s = a + b; // Slice a substring out of it. var slice = s.substring(0, 20); // Make the original string thin. var o = {}; o[s]; return slice; } var t = get_sliced_thin_string( 'abcdefghijklmnopqrstuvwxyz', 'abcdefghijklmnopqrstuvwxyz'); assertEquals("abcdefghijklmnopqrst", decodeURI(t)); function cc2(s) { assertEquals(97, s.charCodeAt(0)); assertEquals(97, s.codePointAt(0)); }; %PrepareFunctionForOptimization(cc2); cc2(t); cc2(t); %OptimizeFunctionOnNextCall(cc2); cc2(t); function string_table_lookup_sliced_thin_string(a, b) { // Make a ConsString. var s = a + b; // Slice a substring out of it. var slice = s.substring(0, 20); // Make the original string thin. var o = {}; o[s]; // Try to internalize the SlicedString. o[slice]; } string_table_lookup_sliced_thin_string( 'abcdefghijklmnopqrstuvwxyz', '0123456789');