v8/test/cctest/test-func-name-inference.cc

// Copyright 2007-2009 the V8 project authors. All rights reserved.
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#include "v8.h"

#include "api.h"
#include "runtime.h"
#include "cctest.h"


using ::v8::internal::Handle;
using ::v8::internal::JSFunction;
using ::v8::internal::Object;
using ::v8::internal::Script;
using ::v8::internal::SharedFunctionInfo;
using ::v8::internal::String;

namespace i = ::v8::internal;


static v8::Persistent<v8::Context> env;


static void InitializeVM() {
  if (env.IsEmpty()) {
    v8::HandleScope scope;
    env = v8::Context::New();
  }
  v8::HandleScope scope;
  env->Enter();
}


static void CheckFunctionName(v8::Handle<v8::Script> script,
                              const char* func_pos_src,
                              const char* ref_inferred_name) {
  // Get script source.
  Handle<JSFunction> fun = v8::Utils::OpenHandle(*script);
  Handle<Script> i_script(Script::cast(fun->shared()->script()));
  CHECK(i_script->source()->IsString());
  Handle<String> script_src(String::cast(i_script->source()));

  // Find the position of a given func source substring in the source.
  Handle<String> func_pos_str =
      i::Factory::NewStringFromAscii(i::CStrVector(func_pos_src));
  int func_pos = i::Runtime::StringMatch(script_src, func_pos_str, 0);
  CHECK_NE(0, func_pos);

  // Obtain SharedFunctionInfo for the function.
  Object* shared_func_info_ptr =
      i::Runtime::FindSharedFunctionInfoInScript(i_script, func_pos);
  CHECK(shared_func_info_ptr != i::Heap::undefined_value());
  Handle<SharedFunctionInfo> shared_func_info(
      SharedFunctionInfo::cast(shared_func_info_ptr));

  // Verify inferred function name.
  i::SmartPointer<char> inferred_name =
      shared_func_info->inferred_name()->ToCString();
  CHECK_EQ(ref_inferred_name, *inferred_name);
}


static v8::Handle<v8::Script> Compile(const char* src) {
  return v8::Script::Compile(v8::String::New(src));
}


TEST(GlobalProperty) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "fun1 = function() { return 1; }\n"
      "fun2 = function() { return 2; }\n");
  CheckFunctionName(script, "return 1", "fun1");
  CheckFunctionName(script, "return 2", "fun2");
}


TEST(GlobalVar) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "var fun1 = function() { return 1; }\n"
      "var fun2 = function() { return 2; }\n");
  CheckFunctionName(script, "return 1", "fun1");
  CheckFunctionName(script, "return 2", "fun2");
}


TEST(LocalVar) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function outer() {\n"
      "  var fun1 = function() { return 1; }\n"
      "  var fun2 = function() { return 2; }\n"
      "}");
  CheckFunctionName(script, "return 1", "fun1");
  CheckFunctionName(script, "return 2", "fun2");
}


TEST(InConstructor) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function MyClass() {\n"
      "  this.method1 = function() { return 1; }\n"
      "  this.method2 = function() { return 2; }\n"
      "}");
  CheckFunctionName(script, "return 1", "MyClass.method1");
  CheckFunctionName(script, "return 2", "MyClass.method2");
}


TEST(Factory) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function createMyObj() {\n"
      "  var obj = {};\n"
      "  obj.method1 = function() { return 1; }\n"
      "  obj.method2 = function() { return 2; }\n"
      "  return obj;\n"
      "}");
  CheckFunctionName(script, "return 1", "obj.method1");
  CheckFunctionName(script, "return 2", "obj.method2");
}


TEST(Static) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function MyClass() {}\n"
      "MyClass.static1 = function() { return 1; }\n"
      "MyClass.static2 = function() { return 2; }\n"
      "MyClass.MyInnerClass = {}\n"
      "MyClass.MyInnerClass.static3 = function() { return 3; }\n"
      "MyClass.MyInnerClass.static4 = function() { return 4; }");
  CheckFunctionName(script, "return 1", "MyClass.static1");
  CheckFunctionName(script, "return 2", "MyClass.static2");
  CheckFunctionName(script, "return 3", "MyClass.MyInnerClass.static3");
  CheckFunctionName(script, "return 4", "MyClass.MyInnerClass.static4");
}


TEST(Prototype) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function MyClass() {}\n"
      "MyClass.prototype.method1 = function() { return 1; }\n"
      "MyClass.prototype.method2 = function() { return 2; }\n"
      "MyClass.MyInnerClass = function() {}\n"
      "MyClass.MyInnerClass.prototype.method3 = function() { return 3; }\n"
      "MyClass.MyInnerClass.prototype.method4 = function() { return 4; }");
  CheckFunctionName(script, "return 1", "MyClass.method1");
  CheckFunctionName(script, "return 2", "MyClass.method2");
  CheckFunctionName(script, "return 3", "MyClass.MyInnerClass.method3");
  CheckFunctionName(script, "return 4", "MyClass.MyInnerClass.method4");
}


TEST(ObjectLiteral) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function MyClass() {}\n"
      "MyClass.prototype = {\n"
      "  method1: function() { return 1; },\n"
      "  method2: function() { return 2; } }");
  CheckFunctionName(script, "return 1", "MyClass.method1");
  CheckFunctionName(script, "return 2", "MyClass.method2");
}


TEST(AsParameter) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function f1(a) { return a(); }\n"
      "function f2(a, b) { return a() + b(); }\n"
      "var result1 = f1(function() { return 1; })\n"
      "var result2 = f2(function() { return 2; }, function() { return 3; })");
  // Can't infer names here.
  CheckFunctionName(script, "return 1", "");
  CheckFunctionName(script, "return 2", "");
  CheckFunctionName(script, "return 3", "");
}


TEST(MultipleFuncsConditional) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "fun1 = 0 ?\n"
      "    function() { return 1; } :\n"
      "    function() { return 2; }");
  CheckFunctionName(script, "return 1", "fun1");
  CheckFunctionName(script, "return 2", "fun1");
}


TEST(MultipleFuncsInLiteral) {
  InitializeVM();
  v8::HandleScope scope;

  v8::Handle<v8::Script> script = Compile(
      "function MyClass() {}\n"
      "MyClass.prototype = {\n"
      "  method1: 0 ? function() { return 1; } :\n"
      "               function() { return 2; } }");
  CheckFunctionName(script, "return 1", "MyClass.method1");
  CheckFunctionName(script, "return 2", "MyClass.method1");
}