Revert of Re-land FastAccessorBuilder.

test/cctest/test-api-fast-accessor-builder.cc

-// Copyright 2015 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.
-
-#include <stdlib.h>
-
-#include "include/v8.h"
-#include "include/v8-experimental.h"
-
-#include "src/api.h"
-#include "test/cctest/cctest.h"
-
-namespace {
-
-// These tests mean to exercise v8::FastAccessorBuilder. Since initially the
-// "native" accessor will get called, we need to 'warmup' any accessor first,
-// to make sure we're actually testing the v8::FastAccessorBuilder result.
-// To accomplish this, we will
-// - call each accesssor N times before the actual test.
-// - wrap that call in a function, so that all such calls will go
-//   through a single call site.
-// - register a native accessor which is different from the build one
-//   (so that our tests will always fail if we don't end up in the 'fast'
-//    accessor)
-//
-// This doesn't work if the src function is inlined - as it is when
-// --always-opt is enabled - since then every inlined functino is its own
-// callsite. Hence most test will check for i::FLAG_always_opt.
-#define WARMUP(src) "for(i = 0; i < 2; i++) { " src " } "
-
-static void NativePropertyAccessor(
-    const v8::FunctionCallbackInfo<v8::Value>& info) {
-  info.GetReturnValue().Set(v8_num(123));
-}
-
-}  // anonymous namespace
-
-
-// Build a simple "fast accessor" and verify that it is being called.
-TEST(FastAccessor) {
-  if (i::FLAG_always_opt || i::FLAG_optimize_for_size) return;
-
-  LocalContext env;
-  v8::Isolate* isolate = env->GetIsolate();
-  v8::HandleScope scope(isolate);
-
-  v8::Local<v8::FunctionTemplate> foo = v8::FunctionTemplate::New(isolate);
-
-  // Native accessor, bar, returns 123.
-  foo->PrototypeTemplate()->SetAccessorProperty(
-      v8_str("bar"),
-      v8::FunctionTemplate::New(isolate, NativePropertyAccessor));
-
-  // Fast accessor, barf, returns 124.
-  auto fab = v8::experimental::FastAccessorBuilder::New(isolate);
-  fab->ReturnValue(fab->IntegerConstant(124));
-  foo->PrototypeTemplate()->SetAccessorProperty(
-      v8_str("barf"), v8::FunctionTemplate::NewWithFastHandler(
-                          isolate, NativePropertyAccessor, fab));
-
-  // Install foo on the global object.
-  CHECK(env->Global()
-            ->Set(env.local(), v8_str("foo"),
-                  foo->GetFunction(env.local()).ToLocalChecked())
-            .FromJust());
-
-  // Wrap f.barf + IC warmup.
-  CompileRun(
-      "function barf() { f = new foo(); return f.barf }; " WARMUP("barf()"));
-
-  ExpectInt32("f = new foo(); f.bar", 123);
-  ExpectInt32("f = new foo(); f.barf", 123);  // First call in this call site.
-  ExpectInt32("barf()", 124);                 // Call via warmed-up callsite.
-}
-
-
-void AddInternalFieldAccessor(v8::Isolate* isolate,
-                              v8::Local<v8::Template> templ, const char* name,
-                              int field_no) {
-  auto builder = v8::experimental::FastAccessorBuilder::New(isolate);
-  builder->ReturnValue(
-      builder->LoadInternalField(builder->GetReceiver(), field_no));
-  templ->SetAccessorProperty(v8_str(name),
-                             v8::FunctionTemplate::NewWithFastHandler(
-                                 isolate, NativePropertyAccessor, builder));
-}
-
-
-// "Fast" accessor that accesses an internal field.
-TEST(FastAccessorWithInternalField) {
-  if (i::FLAG_always_opt || i::FLAG_optimize_for_size) return;
-
-  LocalContext env;
-  v8::Isolate* isolate = env->GetIsolate();
-  v8::HandleScope scope(isolate);
-
-  v8::Local<v8::ObjectTemplate> foo = v8::ObjectTemplate::New(isolate);
-  foo->SetInternalFieldCount(3);
-  AddInternalFieldAccessor(isolate, foo, "field0", 0);
-  AddInternalFieldAccessor(isolate, foo, "field1", 1);
-  AddInternalFieldAccessor(isolate, foo, "field2", 2);
-
-  // Create an instance w/ 3 internal fields, put in a string, a Smi, nothing.
-  v8::Local<v8::Object> obj = foo->NewInstance(env.local()).ToLocalChecked();
-  obj->SetInternalField(0, v8_str("Hi there!"));
-  obj->SetInternalField(1, v8::Integer::New(isolate, 4321));
-  CHECK(env->Global()->Set(env.local(), v8_str("obj"), obj).FromJust());
-
-  // Warmup.
-  CompileRun("function field0() { return obj.field0 }; " WARMUP("field0()"));
-  CompileRun("function field1() { return obj.field1 }; " WARMUP("field1()"));
-  CompileRun("function field2() { return obj.field2 }; " WARMUP("field2()"));
-
-  // Access fields.
-  ExpectString("field0()", "Hi there!");
-  ExpectInt32("field1()", 4321);
-  ExpectUndefined("field2()");
-}
-
-
-// "Fast" accessor with control flow via ...OrReturnNull methods.
-TEST(FastAccessorOrReturnNull) {
-  if (i::FLAG_always_opt || i::FLAG_optimize_for_size) return;
-
-  LocalContext env;
-  v8::Isolate* isolate = env->GetIsolate();
-  v8::HandleScope scope(isolate);
-
-  v8::Local<v8::ObjectTemplate> foo = v8::ObjectTemplate::New(isolate);
-  foo->SetInternalFieldCount(2);
-  {
-    // accessor "nullcheck": Return null if field 0 is non-null object; else 5.
-    auto builder = v8::experimental::FastAccessorBuilder::New(isolate);
-    auto val = builder->LoadInternalField(builder->GetReceiver(), 0);
-    builder->CheckNotZeroOrReturnNull(val);
-    builder->ReturnValue(builder->IntegerConstant(5));
-    foo->SetAccessorProperty(v8_str("nullcheck"),
-                             v8::FunctionTemplate::NewWithFastHandler(
-                                 isolate, NativePropertyAccessor, builder));
-  }
-  {
-    // accessor "maskcheck": Return null if field 1 has 3rd bit set.
-    auto builder = v8::experimental::FastAccessorBuilder::New(isolate);
-    auto val = builder->LoadInternalField(builder->GetReceiver(), 1);
-    builder->CheckFlagSetOrReturnNull(val, 0x4);
-    builder->ReturnValue(builder->IntegerConstant(42));
-    foo->SetAccessorProperty(v8_str("maskcheck"),
-                             v8::FunctionTemplate::NewWithFastHandler(
-                                 isolate, NativePropertyAccessor, builder));
-  }
-
-  // Create an instance.
-  v8::Local<v8::Object> obj = foo->NewInstance(env.local()).ToLocalChecked();
-  CHECK(env->Global()->Set(env.local(), v8_str("obj"), obj).FromJust());
-
-  // CheckNotZeroOrReturnNull:
-  CompileRun(
-      "function nullcheck() { return obj.nullcheck }; " WARMUP("nullcheck()"));
-  obj->SetAlignedPointerInInternalField(0, /* anything != nullptr */ isolate);
-  ExpectInt32("nullcheck()", 5);
-  obj->SetAlignedPointerInInternalField(0, nullptr);
-  ExpectNull("nullcheck()");
-
-  // CheckFlagSetOrReturnNull:
-  CompileRun(
-      "function maskcheck() { return obj.maskcheck }; " WARMUP("maskcheck()"));
-  obj->SetAlignedPointerInInternalField(1, reinterpret_cast<void*>(0xf0));
-  ExpectInt32("maskcheck()", 42);
-  obj->SetAlignedPointerInInternalField(1, reinterpret_cast<void*>(0xfe));
-  ExpectNull("maskcheck()");
-}
-
-
-// "Fast" accessor with simple control flow via explicit labels.
-TEST(FastAccessorControlFlowWithLabels) {
-  if (i::FLAG_always_opt || i::FLAG_optimize_for_size) return;
-
-  LocalContext env;
-  v8::Isolate* isolate = env->GetIsolate();
-  v8::HandleScope scope(isolate);
-
-  v8::Local<v8::ObjectTemplate> foo = v8::ObjectTemplate::New(isolate);
-  foo->SetInternalFieldCount(1);
-  {
-    // accessor isnull: 0 for nullptr, else 1.
-    auto builder = v8::experimental::FastAccessorBuilder::New(isolate);
-    auto label = builder->MakeLabel();
-    auto val = builder->LoadInternalField(builder->GetReceiver(), 0);
-    builder->CheckNotZeroOrJump(val, label);
-    builder->ReturnValue(builder->IntegerConstant(0));
-    builder->SetLabel(label);
-    builder->ReturnValue(builder->IntegerConstant(1));
-    foo->SetAccessorProperty(v8_str("isnull"),
-                             v8::FunctionTemplate::NewWithFastHandler(
-                                 isolate, NativePropertyAccessor, builder));
-  }
-
-  // Create an instance.
-  v8::Local<v8::Object> obj = foo->NewInstance(env.local()).ToLocalChecked();
-  CHECK(env->Global()->Set(env.local(), v8_str("obj"), obj).FromJust());
-
-  // CheckNotZeroOrReturnNull:
-  CompileRun("function isnull() { return obj.isnull }; " WARMUP("isnull()"));
-  obj->SetAlignedPointerInInternalField(0, /* anything != nullptr */ isolate);
-  ExpectInt32("isnull()", 1);
-  obj->SetAlignedPointerInInternalField(0, nullptr);
-  ExpectInt32("isnull()", 0);
-}
-
-
-// "Fast" accessor, loading things.
-TEST(FastAccessorLoad) {
-  if (i::FLAG_always_opt || i::FLAG_optimize_for_size) return;
-
-  LocalContext env;
-  v8::Isolate* isolate = env->GetIsolate();
-  v8::HandleScope scope(isolate);
-
-  v8::Local<v8::ObjectTemplate> foo = v8::ObjectTemplate::New(isolate);
-  foo->SetInternalFieldCount(1);
-
-  // Internal field 0 is a pointer to a C++ data structure that we wish to load
-  // field values from.
-  struct {
-    size_t intval;
-    v8::Local<v8::String> v8val;
-  } val = {54321, v8_str("Hello")};
-
-  {
-    // accessor intisnonzero
-    int intval_offset =
-        static_cast<int>(reinterpret_cast<intptr_t>(&val.intval) -
-                         reinterpret_cast<intptr_t>(&val));
-    auto builder = v8::experimental::FastAccessorBuilder::New(isolate);
-    auto label = builder->MakeLabel();
-    auto val = builder->LoadValue(
-        builder->LoadInternalField(builder->GetReceiver(), 0), intval_offset);
-    builder->CheckNotZeroOrJump(val, label);
-    builder->ReturnValue(builder->IntegerConstant(0));
-    builder->SetLabel(label);
-    builder->ReturnValue(builder->IntegerConstant(1));
-    foo->SetAccessorProperty(v8_str("nonzero"),
-                             v8::FunctionTemplate::NewWithFastHandler(
-                                 isolate, NativePropertyAccessor, builder));
-  }
-  {
-    // accessor loadval
-    int v8val_offset = static_cast<int>(reinterpret_cast<intptr_t>(&val.v8val) -
-                                        reinterpret_cast<intptr_t>(&val));
-    auto builder = v8::experimental::FastAccessorBuilder::New(isolate);
-    builder->ReturnValue(builder->LoadObject(
-        builder->LoadInternalField(builder->GetReceiver(), 0), v8val_offset));
-    foo->SetAccessorProperty(v8_str("loadval"),
-                             v8::FunctionTemplate::NewWithFastHandler(
-                                 isolate, NativePropertyAccessor, builder));
-  }
-
-  // Create an instance.
-  v8::Local<v8::Object> obj = foo->NewInstance(env.local()).ToLocalChecked();
-  obj->SetAlignedPointerInInternalField(0, &val);
-  CHECK(env->Global()->Set(env.local(), v8_str("obj"), obj).FromJust());
-
-  // Access val.intval:
-  CompileRun("function nonzero() { return obj.nonzero }; " WARMUP("nonzero()"));
-  ExpectInt32("nonzero()", 1);
-  val.intval = 0;
-  ExpectInt32("nonzero()", 0);
-  val.intval = 27;
-  ExpectInt32("nonzero()", 1);
-
-  // Access val.v8val:
-  CompileRun("function loadval() { return obj.loadval }; " WARMUP("loadval()"));
-  ExpectString("loadval()", "Hello");
-}