1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8
9 #include "include/libplatform/libplatform.h"
10 #include "include/v8.h"
11
main(int argc,char * argv[])12 int main(int argc, char* argv[]) {
13 // Initialize V8.
14 v8::V8::InitializeICUDefaultLocation(argv[0]);
15 v8::V8::InitializeExternalStartupData(argv[0]);
16 std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();
17 v8::V8::InitializePlatform(platform.get());
18 v8::V8::Initialize();
19
20 // Create a new Isolate and make it the current one.
21 v8::Isolate::CreateParams create_params;
22 create_params.array_buffer_allocator =
23 v8::ArrayBuffer::Allocator::NewDefaultAllocator();
24 v8::Isolate* isolate = v8::Isolate::New(create_params);
25 {
26 v8::Isolate::Scope isolate_scope(isolate);
27
28 // Create a stack-allocated handle scope.
29 v8::HandleScope handle_scope(isolate);
30
31 // Create a new context.
32 v8::Local<v8::Context> context = v8::Context::New(isolate);
33
34 // Enter the context for compiling and running the hello world script.
35 v8::Context::Scope context_scope(context);
36
37 {
38 // Create a string containing the JavaScript source code.
39 v8::Local<v8::String> source =
40 v8::String::NewFromUtf8(isolate, "'Hello' + ', World!'",
41 v8::NewStringType::kNormal)
42 .ToLocalChecked();
43
44 // Compile the source code.
45 v8::Local<v8::Script> script =
46 v8::Script::Compile(context, source).ToLocalChecked();
47
48 // Run the script to get the result.
49 v8::Local<v8::Value> result = script->Run(context).ToLocalChecked();
50
51 // Convert the result to an UTF8 string and print it.
52 v8::String::Utf8Value utf8(isolate, result);
53 printf("%s\n", *utf8);
54 }
55
56 {
57 // Use the JavaScript API to generate a WebAssembly module.
58 //
59 // |bytes| contains the binary format for the following module:
60 //
61 // (func (export "add") (param i32 i32) (result i32)
62 // get_local 0
63 // get_local 1
64 // i32.add)
65 //
66 const char* csource = R"(
67 let bytes = new Uint8Array([
68 0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x07, 0x01,
69 0x60, 0x02, 0x7f, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x07,
70 0x07, 0x01, 0x03, 0x61, 0x64, 0x64, 0x00, 0x00, 0x0a, 0x09, 0x01,
71 0x07, 0x00, 0x20, 0x00, 0x20, 0x01, 0x6a, 0x0b
72 ]);
73 let module = new WebAssembly.Module(bytes);
74 let instance = new WebAssembly.Instance(module);
75 instance.exports.add(3, 4);
76 )";
77
78 // Create a string containing the JavaScript source code.
79 v8::Local<v8::String> source =
80 v8::String::NewFromUtf8(isolate, csource, v8::NewStringType::kNormal)
81 .ToLocalChecked();
82
83 // Compile the source code.
84 v8::Local<v8::Script> script =
85 v8::Script::Compile(context, source).ToLocalChecked();
86
87 // Run the script to get the result.
88 v8::Local<v8::Value> result = script->Run(context).ToLocalChecked();
89
90 // Convert the result to a uint32 and print it.
91 uint32_t number = result->Uint32Value(context).ToChecked();
92 printf("3 + 4 = %u\n", number);
93 }
94 }
95
96 // Dispose the isolate and tear down V8.
97 isolate->Dispose();
98 v8::V8::Dispose();
99 v8::V8::ShutdownPlatform();
100 delete create_params.array_buffer_allocator;
101 return 0;
102 }
103