WIP: prototype ffi support

test/cctest/test-ffi.cc

+// 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.
+
+#include <math.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "src/compiler/ffi-compiler.h"
+
+#include "test/cctest/cctest.h"
+
+using namespace v8::base;
+using namespace v8::internal;
+using namespace v8::internal::compiler;
+
+static int foo() {
+  printf("hello world from native code\n");
+  return 42;
+}
+
+TEST(Run_FFI_Hello) {
+  Isolate* isolate = CcTest::InitIsolateOnce();
+  HandleScope scope(isolate);
+
+  Handle<String> name = isolate->factory()->InternalizeUtf8String("foo");
+  Handle<Object> undefined = isolate->factory()->undefined_value();
+
+  MachineType reps[] = {MachineType::Int32()};
+  static v8::internal::MachineSignature sig_foo(1, 0, reps);
+  v8::internal::ffi::NativeFunction func = {&sig_foo,
+                                            reinterpret_cast<uint8_t*>(foo)};
+
+  Handle<JSFunction> jsfunc = CompileJSToNativeWrapper(isolate, name, func);
+
+  Handle<Object> result =
+      Execution::Call(isolate, jsfunc, undefined, 0, nullptr).ToHandleChecked();
+
+  CHECK_EQ(42.0, result->Number());
+}
+
+static int add2(int x, int y) { return x + y; }
+
+TEST(Run_FFI_add2) {
+  Isolate* isolate = CcTest::InitIsolateOnce();
+  HandleScope scope(isolate);
+
+  Handle<String> name = isolate->factory()->InternalizeUtf8String("add2");
+  Handle<Object> undefined = isolate->factory()->undefined_value();
+
+  MachineType reps[] = {MachineType::Int32(), MachineType::Int32(),
+                        MachineType::Int32()};
+  static v8::internal::MachineSignature sig(1, 2, reps);
+  v8::internal::ffi::NativeFunction func = {&sig,
+                                            reinterpret_cast<uint8_t*>(add2)};
+
+  Handle<JSFunction> jsfunc = CompileJSToNativeWrapper(isolate, name, func);
+
+  // Simple math should work.
+  {
+    Handle<Object> args[] = {isolate->factory()->NewNumber(1.0),
+                             isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(42.0, result->Number());
+  }
+
+  // Truncate floating point to integer.
+  {
+    Handle<Object> args[] = {isolate->factory()->NewNumber(1.9),
+                             isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(42.0, result->Number());
+  }
+
+  // INT_MAX + 1 should wrap.
+  {
+    Handle<Object> args[] = {isolate->factory()->NewNumber(kMaxInt),
+                             isolate->factory()->NewNumber(1)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(kMinInt, result->Number());
+  }
+
+  // INT_MIN + -1 should wrap.
+  {
+    Handle<Object> args[] = {isolate->factory()->NewNumber(kMinInt),
+                             isolate->factory()->NewNumber(-1)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(kMaxInt, result->Number());
+  }
+
+  // Numbers get truncated to the 32 least significant bits.
+  {
+    Handle<Object> args[] = {isolate->factory()->NewNumber(1ull << 40),
+                             isolate->factory()->NewNumber(-1)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(-1, result->Number());
+  }
+
+  // String '57' converts to 57.
+  {
+    Handle<Object> args[] = {
+        isolate->factory()->NewStringFromAsciiChecked("57"),
+        isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(98.0, result->Number());
+  }
+
+  // String 'foo' converts to 0.
+  // TODO(ofrobots): should this throw instead?
+  {
+    Handle<Object> args[] = {
+        isolate->factory()->NewStringFromAsciiChecked("foo"),
+        isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(41.0, result->Number());
+  }
+
+  // String '58o' converts to 0.
+  // TODO(ofrobots): should this throw instead?
+  {
+    Handle<Object> args[] = {
+        isolate->factory()->NewStringFromAsciiChecked("58o"),
+        isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(41.0, result->Number());
+  }
+
+  // NaN converts to 0.
+  // TODO(ofrobots): should this throw instead?
+  {
+    Handle<Object> args[] = {isolate->factory()->nan_value(),
+                             isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(41.0, result->Number());
+  }
+
+  // null converts to 0.
+  // TODO(ofrobots): should this throw instead?
+  {
+    Handle<Object> args[] = {isolate->factory()->null_value(),
+                             isolate->factory()->NewNumber(41.0)};
+    Handle<Object> result =
+        Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+            .ToHandleChecked();
+    CHECK_EQ(41.0, result->Number());
+  }
+}
+
+static int add7(int x1, int x2, int x3, int x4, int x5, int x6, int x7) {
+  return x1 + x2 + x3 + x4 + x5 + x6 + x7;
+}
+
+TEST(Run_FFI_add7) {
+  Isolate* isolate = CcTest::InitIsolateOnce();
+  HandleScope scope(isolate);
+
+  Handle<String> name = isolate->factory()->InternalizeUtf8String("add7");
+  Handle<Object> undefined = isolate->factory()->undefined_value();
+
+  MachineType reps[] = {MachineType::Int32(), MachineType::Int32(),
+                        MachineType::Int32(), MachineType::Int32(),
+                        MachineType::Int32(), MachineType::Int32(),
+                        MachineType::Int32(), MachineType::Int32()};
+  static v8::internal::MachineSignature sig(1, 7, reps);
+  v8::internal::ffi::NativeFunction func = {&sig,
+                                            reinterpret_cast<uint8_t*>(add7)};
+
+  Handle<JSFunction> jsfunc = CompileJSToNativeWrapper(isolate, name, func);
+
+  Handle<Object> args[] = {
+      isolate->factory()->NewNumber(1.0), isolate->factory()->NewNumber(2.0),
+      isolate->factory()->NewNumber(3.0), isolate->factory()->NewNumber(4.0),
+      isolate->factory()->NewNumber(5.0), isolate->factory()->NewNumber(6.0),
+      isolate->factory()->NewNumber(7.0)};
+  Handle<Object> result =
+      Execution::Call(isolate, jsfunc, undefined, arraysize(args), args)
+          .ToHandleChecked();
+
+  CHECK_EQ(28.0, result->Number());
+}