예제 #1
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  /**
   * Test for one of the bugs causing issue 8284. JsObfuscateNamer was used to assign obfuscated
   * names to deduped functions and as a result it might have modified the other names that had been
   * assigned invalidating the irrevocable decision made by the deduper.
   */
  public void testRerunNamerError() throws Exception {
    JsProgram program = new JsProgram();
    // Reference to a in _.b is to the top level scope a function where the one in _.c is to the
    // local a definition.
    //
    // After deduping _.b and _.c the identifier a in the deduped function points to the top level
    // scope a function and runing a namer afterwards makes the deduping invalid.

    // CAVEAT: The two functions that have {return a;} as their bodies are not actually duplicates
    // but we use them to model functions that refer to names at different scopes. Because this
    // optimization only runs on JsFunctions that come from Java source this situation does not
    // happen.
    String js =
        "var c; function a(){return f1;}; function f1() {_.b = function() {return a;} }; "
            + "function f2() { var a = null; _.c = function() {return a;} };f1();f2();_.b();_.c();";
    List<JsStatement> input =
        JsParser.parse(SourceOrigin.UNKNOWN, program.getScope(), new StringReader(js));
    program.getGlobalBlock().getStatements().addAll(input);

    // Mark all functions as if they were translated from Java sources.
    setAllFromJava(program);

    // Get the JsNames for the top level a and the f2() scoped a.
    JsName topScope_a = program.getScope().findExistingName("a");
    JsName f2_a = null;
    for (JsScope scope : program.getScope().getChildren()) {
      if (scope.toString().startsWith("function f2->")) {
        f2_a = scope.findExistingName("a");
      }
    }

    assertTrue(topScope_a != f2_a);

    optimize(program, JsSymbolResolver.class, JsDuplicateFunctionRemoverProxy.class);

    // collect values assigned to some identifiers.
    final Map<String, JsName> assignments = AssignmentGatherer.exec(program);

    // If the function have been dedupped then there is a constraint that the different JsNames
    // they referred to are obfuscated to the same id.
    // Hence if _.c and _.b are collapsed the top scope name "a" and the one in f2() need to remain
    // the same.
    assertTrue(
        assignments.get("_.b") != assignments.get("_.c")
            || topScope_a.getShortIdent().equals(f2_a.getShortIdent()));
  }
예제 #2
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  public void testVirtualRemoveDuplicates() throws Exception {
    JsProgram program = new JsProgram();
    String js = "_.method1=function(){};_.method2=function(){};_.method1();_.method2();";
    List<JsStatement> input =
        JsParser.parse(SourceOrigin.UNKNOWN, program.getScope(), new StringReader(js));
    program.getGlobalBlock().getStatements().addAll(input);

    // Mark all functions as if they were translated from Java sources.
    setAllFromJava(program);

    String firstName = new MockNameGenerator().getFreshName();
    assertEquals(
        "_.method1="
            + firstName
            + ";_.method2="
            + firstName
            + ";_.method1();_.method2();function "
            + firstName
            + "(){}\n",
        optimize(program, JsSymbolResolver.class, JsDuplicateFunctionRemoverProxy.class));
  }
예제 #3
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  /**
   * Test for one of the bugs causing issue 8284. JsObfuscateNamer was reassigning the same names
   * across different fragments.
   */
  public void testDuplicateNamesWithCodeSplitterError() throws Exception {
    JsProgram program = new JsProgram();
    // Reference to a in .b is to the top level scope a function where the one in _.c is to the
    // local a definition.
    //
    // After deduping _.b and _.c the identifier a in the deduped function points to the top level
    // scope a function and runing a namer afterwards makes the deduping invalid.
    String fragment0js = "_.a=function (){return _.a;}; _.b=function (){return _.a}; _.a();_.b();";
    String fragment1js = "_.c=function (){return _.c;}; _.d=function (){return _.c}; _.c();_.d();";

    List<JsStatement> fragment0 =
        JsParser.parse(SourceOrigin.UNKNOWN, program.getScope(), new StringReader(fragment0js));
    List<JsStatement> fragment1 =
        JsParser.parse(SourceOrigin.UNKNOWN, program.getScope(), new StringReader(fragment1js));
    program.setFragmentCount(2);
    program.getFragmentBlock(0).getStatements().addAll(fragment0);
    program.getFragmentBlock(1).getStatements().addAll(fragment1);

    // Mark all functions as if they were translated from Java sources.
    setAllFromJava(program);

    optimize(program, JsSymbolResolver.class, JsDuplicateFunctionRemoverProxy.class);

    // There should be two distinct dedupped functions here.
    MockNameGenerator tempFreshNameGenerator = new MockNameGenerator();
    String firstName = tempFreshNameGenerator.getFreshName();
    String secondName = tempFreshNameGenerator.getFreshName();

    assertNotNull(program.getScope().findExistingName(secondName));
  }
 private Node transform(JsNameRef x) {
   Node n;
   JsName name = x.getName();
   boolean isExternal = name == null || !name.isObfuscatable();
   if (x.getQualifier() != null) {
     n = IR.getprop(transform(x.getQualifier()), transformNameAsString(x.getShortIdent(), x));
     if (isExternal) {
       this.externalProperties.add(x.getShortIdent());
     }
   } else {
     n = transformName(x.getShortIdent(), x);
     if (isExternal) {
       this.externalVars.add(x.getShortIdent());
     } else if (name.getEnclosing() == program.getScope()) {
       this.globalVars.add(x.getShortIdent());
     }
   }
   applyOriginalName(n, x);
   return applySourceInfo(n, x);
 }
예제 #5
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 /**
  * Verifies the JavaScript function corresponding to <code>test.EntryPoint.onModuleLoad</code>.
  */
 private static void checkOnModuleLoad(JsProgram program, String expectedJavascript) {
   JsName onModuleLoad = program.getScope().findExistingName("test_EntryPoint_onModuleLoad__V");
   assertNotNull(onModuleLoad);
   assert onModuleLoad.getStaticRef() instanceof JsFunction;
   assertEquals(expectedJavascript, serializeJs(onModuleLoad.getStaticRef()));
 }
예제 #6
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 protected final void execImpl() {
   reset();
   visit(program.getScope());
   reset();
   visit(program.getObjectScope());
 }