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generate_code_cache.js
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139 lines (119 loc) · 4.03 KB
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'use strict';
// Flags: --expose-internals
// This file generates the code cache for builtin modules and
// writes them into static char arrays of a C++ file that can be
// compiled into the binary using the `--code-cache-path` option
// of `configure`.
const {
getCodeCache,
getSource,
cachableBuiltins
} = require('internal/bootstrap/cache');
function hash(str) {
if (process.versions.openssl) {
return require('crypto').createHash('sha256').update(str).digest('hex');
}
return '';
}
const fs = require('fs');
const resultPath = process.argv[2];
if (!resultPath) {
console.error(`Usage: ${process.argv[0]} ${process.argv[1]}` +
'path/to/node_code_cache.cc');
process.exit(1);
}
/**
* Format a number of a size in bytes into human-readable strings
* @param {number} num
* @return {string}
*/
function formatSize(num) {
if (num < 1024) {
return `${(num).toFixed(2)}B`;
} else if (num < 1024 ** 2) {
return `${(num / 1024).toFixed(2)}KB`;
} else if (num < 1024 ** 3) {
return `${(num / (1024 ** 2)).toFixed(2)}MB`;
} else {
return `${(num / (1024 ** 3)).toFixed(2)}GB`;
}
}
/**
* Generates the source code of definitions of the char arrays
* that contains the code cache and the source code of the
* initializers of the code cache.
*
* @param {string} key ID of the builtin module
* @param {Buffer} cache Code cache of the builtin module
* @return { definition: string, initializer: string }
*/
function getInitalizer(key, cache) {
const defName = key.replace(/\//g, '_').replace(/-/g, '_');
const definition = `static uint8_t ${defName}_raw[] = {\n` +
`${cache.join(',')}\n};`;
const source = getSource(key);
const sourceHash = hash(source);
const initializer = `
v8::Local<v8::ArrayBuffer> ${defName}_ab =
v8::ArrayBuffer::New(isolate, ${defName}_raw, ${cache.length});
v8::Local<v8::Uint8Array> ${defName}_array =
v8::Uint8Array::New(${defName}_ab, 0, ${cache.length});
target->Set(context,
FIXED_ONE_BYTE_STRING(isolate, "${key}"),
${defName}_array).FromJust();
`;
const hashIntializer = `
target->Set(context,
FIXED_ONE_BYTE_STRING(isolate, "${key}"),
OneByteString(isolate, "${sourceHash}")).FromJust();
`;
return {
definition, initializer, hashIntializer, sourceHash
};
}
const cacheDefinitions = [];
const cacheInitializers = [];
const cacheHashInitializers = [];
let totalCacheSize = 0;
for (const key of cachableBuiltins) {
const cachedData = getCodeCache(key);
if (!cachedData.length) {
console.error(`Failed to generate code cache for '${key}'`);
process.exit(1);
}
const length = cachedData.length;
totalCacheSize += length;
const {
definition, initializer, hashIntializer, sourceHash
} = getInitalizer(key, cachedData);
cacheDefinitions.push(definition);
cacheInitializers.push(initializer);
cacheHashInitializers.push(hashIntializer);
console.log(`Generated cache for '${key}', size = ${formatSize(length)}` +
`, hash = ${sourceHash}, total = ${formatSize(totalCacheSize)}`);
}
const result = `#include "node.h"
#include "node_code_cache.h"
#include "v8.h"
#include "env.h"
#include "env-inl.h"
// This file is generated by tools/generate_code_cache.js
// and is used when configure is run with \`--code-cache-path\`
namespace node {
${cacheDefinitions.join('\n\n')}
// The target here will be returned as \`internalBinding('code_cache')\`
void DefineCodeCache(Environment* env, v8::Local<v8::Object> target) {
v8::Isolate* isolate = env->isolate();
v8::Local<v8::Context> context = env->context();
${cacheInitializers.join('\n')}
}
// The target here will be returned as \`internalBinding('code_cache_hash')\`
void DefineCodeCacheHash(Environment* env, v8::Local<v8::Object> target) {
v8::Isolate* isolate = env->isolate();
v8::Local<v8::Context> context = env->context();
${cacheHashInitializers.join('\n')}
}
} // namespace node
`;
fs.writeFileSync(resultPath, result);
console.log(`Generated code cache C++ file to ${resultPath}`);