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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,
compileFunction,
cachableBuiltins
} = require('internal/bootstrap/cache');
const {
types: {
isUint8Array
}
} = require('util');
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 `${(num / (1024 ** 3)).toFixed(2)}GB`;
}
}
/**
* Generates the source code of definitions of the char arrays
* that contains the code cache and the source code of the
* initializers of the code cache.
*
* @param {string} key ID of the builtin module
* @param {Uint8Array} cache Code cache of the builtin module
* @return { definition: string, initializer: string }
*/
function getInitalizer(key, cache) {
const defName = `${key.replace(/\//g, '_').replace(/-/g, '_')}_raw`;
const definition = `static const uint8_t ${defName}[] = {\n` +
`${cache.join(',')}\n};`;
const dataDef = 'std::make_unique<v8::ScriptCompiler::CachedData>(' +
`${defName}, static_cast<int>(arraysize(${defName})), ` +
'policy)';
const initializer =
'code_cache_.emplace(\n' +
` "${key}",\n` +
` ${dataDef}\n` +
');';
return {
definition, initializer
};
}
const cacheDefinitions = [];
const cacheInitializers = [];
let totalCacheSize = 0;
function lexical(a, b) {
if (a < b) {
return -1;
}
if (a > b) {
return 1;
}
return 0;
}
for (const key of cachableBuiltins.sort(lexical)) {
compileFunction(key); // compile it
const cachedData = getCodeCache(key);
if (!isUint8Array(cachedData)) {
console.error(`Failed to generate code cache for '${key}'`);
process.exit(1);
}
const size = cachedData.byteLength;
totalCacheSize += size;
const {
definition, initializer,
} = getInitalizer(key, cachedData);
cacheDefinitions.push(definition);
cacheInitializers.push(initializer);
console.log(`Generated cache for '${key}', size = ${formatSize(size)}` +
`, total = ${formatSize(totalCacheSize)}`);
}
const result = `#include "node_native_module.h"
#include "node_internals.h"
// This file is generated by tools/generate_code_cache.js
// and is used when configure is run with \`--code-cache-path\`
namespace node {
namespace native_module {
${cacheDefinitions.join('\n\n')}
void NativeModuleLoader::LoadCodeCache() {
auto policy = v8::ScriptCompiler::CachedData::BufferPolicy::BufferNotOwned;
${cacheInitializers.join('\n ')}
}
} // namespace native_module
} // namespace node
`;
fs.writeFileSync(resultPath, result);
console.log(`Generated code cache C++ file to ${resultPath}`);
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