[wasm] Fix binary search for asm.js offsets

test/mjsunit/wasm/asm-wasm-stack.js

 // 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: --validate-asm --allow-natives-syntax
 
 var filename = '(?:[^ ]+/)?test/mjsunit/wasm/asm-wasm-stack.js';
 filename = filename.replace(/\//g, '[/\\\\]');
 
 function checkPreformattedStack(e, expected_lines) {
@@ skipping 31 matching lines @@
 function throwException() {
   throw new Error('exception from JS');
 }
 
 function generateWasmFromAsmJs(stdlib, foreign, heap) {
   'use asm';
   var throwFunc = foreign.throwFunc;
   function callThrow() {
     throwFunc();
   }
-  function redirectFun() {
-    callThrow();
+  function redirectFun(i) {
+    i = i|0;
+    switch (i|0) {
+      case 0: callThrow(); break;
+      case 1: redirectFun(0); break;
+      case 2: redirectFun(1); break;
+    }
   }
   return redirectFun;
 }
 
 (function PreformattedStackTraceFromJS() {
   var fun = generateWasmFromAsmJs(this, {throwFunc: throwException}, undefined);
   var e = null;
   try {
-    fun();
+    fun(0);
   } catch (ex) {
     e = ex;
   }
   assertInstanceof(e, Error, 'exception should have been thrown');
   checkPreformattedStack(e, [
     '^Error: exception from JS$',
     '^ *at throwException \\(' + filename + ':43:9\\)$',
     '^ *at callThrow \\(' + filename + ':50:5\\)$',
-    '^ *at redirectFun \\(' + filename + ':53:5\\)$',
-    '^ *at PreformattedStackTraceFromJS \\(' + filename + ':62:5\\)$',
-    '^ *at ' + filename + ':75:3$'
+    '^ *at redirectFun \\(' + filename + ':55:15\\)$',
+    '^ *at PreformattedStackTraceFromJS \\(' + filename + ':67:5\\)$',
+    '^ *at ' + filename + ':80:3$'
   ]);
 })();
 
 // Now collect the Callsite objects instead of just a string.
 Error.prepareStackTrace = function(error, frames) {
   return frames;
 };
 
 (function CallsiteObjectsFromJS() {
   var fun = generateWasmFromAsmJs(this, {throwFunc: throwException}, undefined);
   var e = null;
   try {
-    fun();
+    fun(2);
   } catch (ex) {
     e = ex;
   }
   assertInstanceof(e, Error, 'exception should have been thrown');
   checkFunctionsOnCallsites(e, [
     ['throwException', 43, 9],         // --
     ['callThrow', 50, 5],              // --
-    ['redirectFun', 53, 5],            // --
-    ['CallsiteObjectsFromJS', 86, 5],  // --
-    [null, 98, 3]
+    ['redirectFun', 55, 15],            // --
+    ['redirectFun', 56, 15],            // --
+    ['redirectFun', 57, 15],            // --
+    ['CallsiteObjectsFromJS', 91, 5],  // --
+    [null, 105, 3]
   ]);
 })();