[inspector] Expose GetPossibleBreakpoints for wasm

test/inspector/debugger/wasm-get-breakable-locations.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: --expose-wasm
+
+load('test/mjsunit/wasm/wasm-constants.js');
+load('test/mjsunit/wasm/wasm-module-builder.js');
+
+var builder = new WasmModuleBuilder();
+
+// clang-format off
+var func_idx = builder.addFunction('helper', kSig_v_v)
+    .addLocals({i32_count: 1})
+    .addBody([
+        kExprNop,
+        kExprI32Const, 12,
+        kExprSetLocal, 0,
+    ]).index;
+
+builder.addFunction('main', kSig_v_i)
+    .addBody([
+        kExprGetLocal, 0,
+        kExprIf, kWasmStmt,
+          kExprBlock, kWasmStmt,
+            kExprCallFunction, func_idx,
+          kExprEnd,
+        kExprEnd
+    ]).exportAs('main');
+// clang-format on
+
+var module_bytes = builder.toArray();
+
+function testFunction(bytes) {
+  var buffer = new ArrayBuffer(bytes.length);
+  var view = new Uint8Array(buffer);
+  for (var i = 0; i < bytes.length; i++) {
+    view[i] = bytes[i] | 0;
+  }
+
+  var module = new WebAssembly.Module(buffer);
+}
+
+var addSourceUrl = (code, url) => '//# sourceURL=' + url + '\n' + code;
+
+InspectorTest.addScript(
+    addSourceUrl(testFunction.toString(), 'v8://test/testFunction'));
+InspectorTest.addScript('var module_bytes = ' + JSON.stringify(module_bytes));
+
+Protocol.Debugger.enable();
+Protocol.Debugger.onScriptParsed(handleScriptParsed);
+InspectorTest.log('Running testFunction...');
+Protocol.Runtime
+    .evaluate({
+      'expression': addSourceUrl(
+          'testFunction(module_bytes)', 'v8://test/runTestFunction')
+    })
+    .then(getBreakableLocationsForAllWasmScripts)
+    .then(() => InspectorTest.log('Finished!'))
+    .then(InspectorTest.completeTest);
+
+var numScripts = 0;
+var wasmScripts = [];
+function handleScriptParsed(messageObject) {
+  var scriptId = messageObject.params.scriptId;
+  var url = messageObject.params.url;
+  InspectorTest.log('Script nr ' + numScripts + ' parsed. URL: ' + url);
+  ++numScripts;
+
+  if (url.startsWith('wasm://')) {
+    InspectorTest.log('This is a wasm script (nr ' + wasmScripts.length + ').');
+    wasmScripts.push(scriptId);
+  }
+}
+
+function printBreakableLocations(message, expectedScriptId, source) {
+  if (!message.result || !message.result.locations) {
+    InspectorTest.logMessage(message);
+    return;
+  }
+  var lines = source.split('\n');
+  var locations = message.result.locations;
+  InspectorTest.log(locations.length + ' breakable location(s):');
+  for (var i = 0; i < locations.length; ++i) {
+    if (locations[i].scriptId != expectedScriptId) {
+      InspectorTest.log(
+          'SCRIPT ID MISMATCH!! ' + locations[i].scriptId + ' != ' +
+          expectedScriptId);
+    }
+    var line = '<illegal line number>';
+    if (locations[i].lineNumber < lines.length) {
+      line = lines[locations[i].lineNumber];
+      if (locations[i].columnNumber < line.length) {
+        line = line.substr(0, locations[i].columnNumber) + '>' +
+            line.substr(locations[i].columnNumber);
+      }
+    }
+    InspectorTest.log(
+        '[' + i + '] ' + locations[i].lineNumber + ':' +
+        locations[i].columnNumber + ' || ' + line);
+  }
+}
+
+function getSourceFromMessage(message) {
+  if (!message.result || !message.result.scriptSource) {

[kozy, 2017/01/25 18:34:19]

Why do you need this method? If you have only valid scriptIds then this method
always should return valid result that you can just use as msg =>
msg.result.scriptSource.

[Clemens Hammacher, 2017/01/25 20:23:54]

I thought it helps debugging in the error case. Removed it.

+    InspectorTest.logMessage(message);
+    return '';
+  }
+  return message.result.scriptSource;
+}
+
+function checkGetBreakableLocations(wasmScriptNr) {
+  InspectorTest.log(
+      'Requesting all breakable locations in wasm script ' + wasmScriptNr);
+  var scriptId = wasmScripts[wasmScriptNr];
+  var source;
+  return Protocol.Debugger.getScriptSource({scriptId: scriptId})
+      .then((message) => source = getSourceFromMessage(message))
+      .then(
+          () => Protocol.Debugger.getPossibleBreakpoints(
+              {start: {lineNumber: 0, columnNumber: 0, scriptId: scriptId}}))
+      .then((message) => printBreakableLocations(message, scriptId, source))
+      .then(
+          () => InspectorTest.log(
+              'Requesting breakable locations in lines [0,3)'))
+      .then(() => Protocol.Debugger.getPossibleBreakpoints({
+        start: {lineNumber: 0, columnNumber: 0, scriptId: scriptId},
+        end: {lineNumber: 3, columnNumber: 0, scriptId: scriptId}
+      }))
+      .then((message) => printBreakableLocations(message, scriptId, source))
+      .then(
+          () => InspectorTest.log(
+              'Requesting breakable locations in lines [4,6)'))
+      .then(() => Protocol.Debugger.getPossibleBreakpoints({

[kozy, 2017/01/25 18:34:19]

Could we add following test:
getPossibleBreakpoints(wasmScript)
execute(wasmScript)
and check that all possible paused occurred?

[Clemens Hammacher, 2017/01/25 20:23:54]

Fair enough :)
Added this test, moving over two fixes from the other CL
http://crrev.com/2651043004.

+        start: {lineNumber: 4, columnNumber: 0, scriptId: scriptId},
+        end: {lineNumber: 6, columnNumber: 0, scriptId: scriptId}
+      }))
+      .then((message) => printBreakableLocations(message, scriptId, source));
+}
+
+function getBreakableLocationsForAllWasmScripts() {
+  InspectorTest.log('Querying breakable locations for all wasm scripts now...');
+  var promise = Promise.resolve();
+  for (var wasmScriptNr = 0; wasmScriptNr < wasmScripts.length;
+       ++wasmScriptNr) {
+    promise = promise.then(checkGetBreakableLocations.bind(null, wasmScriptNr));
+  }
+  return promise;
+}