front_end/core/text_utils/WasmDisassembly.test.ts

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import {assert} from 'chai';
import {describe, it} from 'mocha';

import * as TextUtils from './text_utils.js';

const WasmDisassembly = TextUtils.WasmDisassembly.WasmDisassembly;

describe('WasmDisassembly', () => {
  const LINES = ['A', 'B', 'C', 'D', 'E', 'F', 'G', ' H', 'I'];
  const BYTECODE_OFFSETS = [0, 10, 23, 32, 35, 37, 39, 40, 75];
  const FUNCTION_BODY_OFFSETS = [{start: 35, end: 41}];

  it('reports the correct line numbers', () => {
    const disassembly = new WasmDisassembly(LINES, BYTECODE_OFFSETS, FUNCTION_BODY_OFFSETS);
    assert.strictEqual(disassembly.lineNumbers, BYTECODE_OFFSETS.length);
  });

  it('maps line numbers to bytecode offsets correctly', () => {
    const disassembly = new WasmDisassembly(LINES, BYTECODE_OFFSETS, FUNCTION_BODY_OFFSETS);
    for (const [lineNumber, bytecodeOffset] of BYTECODE_OFFSETS.entries()) {
      assert.strictEqual(disassembly.lineNumberToBytecodeOffset(lineNumber), bytecodeOffset);
    }
  });

  it('maps bytecode offsets to line numbers correctly', () => {
    const disassembly = new WasmDisassembly(LINES, BYTECODE_OFFSETS, FUNCTION_BODY_OFFSETS);
    for (const [lineNumber, bytecodeOffset] of BYTECODE_OFFSETS.entries()) {
      assert.strictEqual(disassembly.bytecodeOffsetToLineNumber(bytecodeOffset), lineNumber);
    }
  });

  it('yields non-breakable line numbers correctly', () => {
    const disassembly = new WasmDisassembly(LINES, BYTECODE_OFFSETS, FUNCTION_BODY_OFFSETS);
    assert.deepEqual([...disassembly.nonBreakableLineNumbers()], [0, 1, 2, 3, 8]);
  });

  it('can be converted to a DeferredContent', () => {
    const disassembly = new WasmDisassembly(LINES, BYTECODE_OFFSETS, FUNCTION_BODY_OFFSETS);
    const content = disassembly.asDeferedContent();

    if ('wasmDisassemblyInfo' in content) {
      assert.strictEqual(content.wasmDisassemblyInfo, disassembly);
    } else {
      assert.fail('wasmDissasembly not set on DeferredContent');
    }
    assert.isEmpty(content.content);
    assert.isFalse(content.isEncoded);
  });

  it('produces the joined lines for the "text" property', () => {
    const disassembly = new WasmDisassembly(LINES, BYTECODE_OFFSETS, FUNCTION_BODY_OFFSETS);

    assert.strictEqual(disassembly.text, 'A\nB\nC\nD\nE\nF\nG\n H\nI');
  });
});