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// Copyright (c) 2015, Matt Godbolt
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
const temp = require('temp'),
path = require('path'),
fs = require('fs-extra'),
denodeify = require('denodeify'),
asm = require('./asm'),
utils = require('./utils'),
_ = require('underscore'),
exec = require('./exec'),
logger = require('./logger').logger,
compilerOptInfo = require("compiler-opt-info"),
argumentParsers = require("./compilers/argument-parsers"),
cfg = require('./cfg'),
languages = require('./languages').list;
class BaseCompiler {
constructor(compiler, env) {
this.compiler = compiler;
this.lang = languages[compiler.lang];
if (!this.lang) {
throw new Error(`Missing language info for ${compiler.lang}`);
}
this.compileFilename = `example${this.lang.extensions[0]}`;
this.env = env;
this.compilerProps = _.partial(this.env.compilerPropsL, this.lang.id);
this.compiler.supportsIntel = !!this.compiler.intelAsm;
if (!this.compiler.options) this.compiler.options = "";
if (!this.compiler.optArg) this.compiler.optArg = "";
if (!this.compiler.supportsOptOutput) this.compiler.supportsOptOutput = false;
if (!this.compiler.disabledFilters)
this.compiler.disabledFilters = [];
else if (typeof this.compiler.disabledFilters == "string")
this.compiler.disabledFilters = this.compiler.disabledFilters.split(',');
this.writeFile = denodeify(fs.writeFile);
this.readFile = denodeify(fs.readFile);
this.stat = denodeify(fs.stat);
}
newTempDir() {
return new Promise((resolve, reject) => {
temp.mkdir({prefix: 'compiler-explorer-compiler', dir: process.env.tmpDir}, (err, dirPath) => {
if (err)
reject(`Unable to open temp file: ${err}`);
else
resolve(dirPath);
});
});
}
optOutputRequested(options) {
return options.some(x => x === "-fsave-optimization-record");
}
getRemote() {
if (this.compiler.exe === null && this.compiler.remote)
return this.compiler.remote;
return false;
}
exec(compiler, args, options) {
// Here only so can be overridden by compiler implementations.
return exec.execute(compiler, args, options);
}
getDefaultExecOptions() {
return {
timeoutMs: this.env.ceProps("compileTimeoutMs", 7500),
maxErrorOutput: this.env.ceProps("max-error-output", 5000),
env: this.env.getEnv(this.compiler.needsMulti),
wrapper: this.compilerProps("compiler-wrapper")
};
}
runCompiler(compiler, options, inputFilename, execOptions) {
if (!execOptions) {
execOptions = this.getDefaultExecOptions();
}
return this.exec(compiler, options, execOptions).then(result => {
result.inputFilename = inputFilename;
result.stdout = utils.parseOutput(result.stdout, inputFilename);
result.stderr = utils.parseOutput(result.stderr, inputFilename);
return result;
});
}
supportsObjdump() {
return this.compiler.objdumper !== "";
}
objdump(outputFilename, result, maxSize, intelAsm, demangle) {
let args = ["-d", outputFilename, "-l", "--insn-width=16"];
if (demangle) args = args.concat("-C");
if (intelAsm) args = args.concat(["-M", "intel"]);
return this.exec(this.compiler.objdumper, args, {maxOutput: maxSize})
.then(objResult => {
result.asm = objResult.stdout;
if (objResult.code !== 0) {
result.asm = `<No output: objdump returned ${objResult.code}>`;
}
return result;
});
}
execBinary(executable, result, maxSize) {
return exec.sandbox(executable, [], {
maxOutput: maxSize,
timeoutMs: 2000
}) // TODO make config
.then(execResult => {
execResult.stdout = utils.parseOutput(execResult.stdout);
execResult.stderr = utils.parseOutput(execResult.stderr);
result.execResult = execResult;
return result;
}).catch(err => {
// TODO: is this the best way? Perhaps failures in sandbox shouldn't reject
// with "results", but instead should play on?
result.execResult = {
stdout: err.stdout ? utils.parseOutput(err.stdout) : [],
stderr: err.stderr ? utils.parseOutput(err.stderr) : [],
code: err.code !== undefined ? err.code : -1
};
return result;
});
}
filename(fn) {
return fn;
}
optionsForFilter(filters, outputFilename) {
let options = ['-g', '-o', this.filename(outputFilename)];
if (this.compiler.intelAsm && filters.intel && !filters.binary) {
options = options.concat(this.compiler.intelAsm.split(" "));
}
if (!filters.binary) options = options.concat('-S');
return options;
}
prepareArguments(userOptions, filters, backendOptions, inputFilename, outputFilename) {
let options = this.optionsForFilter(filters, outputFilename, userOptions);
backendOptions = backendOptions || {};
if (this.compiler.options) {
options = options.concat(this.compiler.options.split(" "));
}
if (this.compiler.supportsOptOutput && backendOptions.produceOptInfo) {
options = options.concat(this.compiler.optArg);
}
userOptions = this.filterUserOptions(userOptions);
return options.concat(userOptions || []).concat([this.filename(inputFilename)]);
}
filterUserOptions(userOptions) {
return userOptions;
}
generateAST(inputFilename, options) {
// These options make Clang produce an AST dump
let newOptions = _.filter(options, option => option !== '-fcolor-diagnostics')
.concat(["-Xclang", "-ast-dump", "-fsyntax-only"]);
let execOptions = this.getDefaultExecOptions();
// A higher max output is needed for when the user includes headers
execOptions.maxOutput = 1024 * 1024 * 1024;
return this.runCompiler(this.compiler.exe, newOptions, this.filename(inputFilename), execOptions)
.then(this.processAstOutput);
}
getOutputFilename(dirPath, outputFilebase) {
// NB keep lower case as ldc compiler `tolower`s the output name
return path.join(dirPath, `${outputFilebase}.s`);
}
generateGccDump(inputFilename, options, gccDumpOptions) {
// Maybe we should not force any RTL dump and let user hand-pick what he needs
const addOpts = [];
/* if not defined, consider it true */
if (gccDumpOptions.treeDump !== false) {
addOpts.push("-fdump-tree-all");
}
if (gccDumpOptions.rtlDump !== false) {
addOpts.push("-fdump-rtl-all");
}
const newOptions = options.concat(addOpts);
const execOptions = this.getDefaultExecOptions();
// A higher max output is needed for when the user includes headers
execOptions.maxOutput = 1024 * 1024 * 1024;
return this.runCompiler(this.compiler.exe, newOptions, this.filename(inputFilename), execOptions)
.then(result => this.processGccDumpOutput(gccDumpOptions, result));
}
checkOutputFileAndDoPostProcess(asmResult, outputFilename, filters) {
return this.stat(outputFilename)
.then(stat => asmResult.asmSize = stat.size)
.then(() => this.postProcess(asmResult, outputFilename, filters));
}
compile(source, options, backendOptions, filters) {
const optionsError = this.checkOptions(options);
if (optionsError) return Promise.reject(optionsError);
const sourceError = this.checkSource(source);
if (sourceError) return Promise.reject(sourceError);
// Don't run binary for unsupported compilers, even if we're asked.
if (filters.binary && !this.compiler.supportsBinary) {
delete filters.binary;
}
const key = {compiler: this.compiler, source, options, backendOptions, filters};
return this.env.cacheGet(key)
.then((result) => {
if (result) return result;
if (filters.binary && !source.match(this.compilerProps("stubRe"))) {
source += "\n" + this.compilerProps("stubText") + "\n";
}
return this.env.enqueue(() => {
const tempFileAndDirPromise = this.newTempDir()
.then(dirPath => {
const inputFilename = path.join(dirPath, this.compileFilename);
return this.writeFile(inputFilename, source).then(() => ({
inputFilename: inputFilename,
dirPath: dirPath
}));
});
const compileToAsmPromise = tempFileAndDirPromise.then(info => {
const inputFilename = info.inputFilename;
const inputFilenameSafe = this.filename(inputFilename);
const dirPath = info.dirPath;
const outputFilebase = "output";
const outputFilename = this.getOutputFilename(dirPath, outputFilebase);
options = _.compact(
this.prepareArguments(options, filters, backendOptions, inputFilename, outputFilename)
);
const execOptions = this.getDefaultExecOptions();
const asmPromise = this.runCompiler(this.compiler.exe, options, inputFilenameSafe, execOptions);
let astPromise;
if (backendOptions && backendOptions.produceAst && this.compiler.supportsAstView) {
astPromise = this.generateAST(inputFilename, options);
} else {
astPromise = Promise.resolve("");
}
let gccDumpPromise;
if (backendOptions && backendOptions.produceGccDump && backendOptions.produceGccDump.opened &&
this.compiler.supportsGccDump) {
gccDumpPromise = this.generateGccDump(
inputFilename, options, backendOptions.produceGccDump);
}
else {
gccDumpPromise = Promise.resolve("");
}
return Promise.all([asmPromise, astPromise, gccDumpPromise])
.then(([asmResult, astResult, gccDumpResult]) => {
asmResult.dirPath = dirPath;
asmResult.compilationOptions = options;
// Here before the check to ensure dump reports even on failure cases
if (this.compiler.supportsGccDump && gccDumpResult) {
asmResult.gccDumpOutput = gccDumpResult;
}
if (asmResult.code !== 0) {
asmResult.asm = "<Compilation failed>";
return asmResult;
}
asmResult.hasOptOutput = false;
if (this.compiler.supportsOptOutput && this.optOutputRequested(options)) {
const optPath = path.join(dirPath, `${outputFilebase}.opt.yaml`);
if (fs.existsSync(optPath)) {
asmResult.hasOptOutput = true;
asmResult.optPath = optPath;
}
}
if (astResult) {
asmResult.hasAstOutput = true;
asmResult.astOutput = astResult;
}
return this.checkOutputFileAndDoPostProcess(asmResult, outputFilename, filters);
});
});
return compileToAsmPromise
.then(results => {
//TODO(jared): this isn't ideal. Rethink
let result;
let optOutput;
if (results.length) {
result = results[0];
optOutput = results[1];
} else {
result = results;
}
if (result.dirPath) {
fs.remove(result.dirPath);
result.dirPath = undefined;
}
if (result.okToCache) {
result.asm = this.asm.process(result.asm, filters);
} else {
result.asm = [{text: result.asm}];
}
if (result.hasOptOutput) {
delete result.optPath;
result.optOutput = optOutput;
}
return result;
})
.then(result => filters.demangle ? this.postProcessAsm(result, filters) : result)
.then(result => {
if (this.compiler.supportsCfg && backendOptions && backendOptions.produceCfg) {
result.cfg = cfg.generateStructure(this.compiler.version, result.asm);
}
return result;
})
.then(result => {
if (result.okToCache) {
// TODO: asynchronously do this? Is it possible to "fire and forget" the promise?
// Do we want to do it higher up?
return this.env.cachePut(key, result).then(() => result);
}
else
return result;
});
});
});
}
postProcessAsm(result) {
if (!result.okToCache) return result;
const demanglerExe = this.compiler.demangler;
if (!demanglerExe) return result;
const demanglerClass = require(this.compiler.demanglerClassFile).Demangler;
const demangler = new demanglerClass(demanglerExe, this);
return demangler.process(result);
}
processOptOutput(hasOptOutput, optPath) {
let output = [];
return new Promise(resolve => {
fs.createReadStream(optPath, {encoding: "utf-8"})
.pipe(new compilerOptInfo.LLVMOptTransformer())
.on("data", opt => {
if (opt.DebugLoc && opt.DebugLoc.File && opt.DebugLoc.File.indexOf(this.compileFilename) > -1) {
output.push(opt);
}
})
.on("end", () => {
if (this.compiler.demangler) {
const result = JSON.stringify(output, null, 4);
this.exec(this.compiler.demangler, ["-n", "-p"], {input: result})
.then(demangleResult => resolve(JSON.parse(demangleResult.stdout)))
.catch(exception => {
logger.warn(`Caught exception ${exception} during opt demangle parsing`);
resolve(output);
});
} else {
resolve(output);
}
});
});
}
couldSupportASTDump(version) {
const versionRegex = /version (\d.\d+)/;
const versionMatch = versionRegex.exec(version);
if (versionMatch) {
const versionNum = parseFloat(versionMatch[1]);
return version.toLowerCase().indexOf("clang") > -1 && versionNum >= 3.3;
}
return false;
}
isCfgCompiler(compilerVersion) {
return compilerVersion.includes("clang") ||
compilerVersion.indexOf("g++") === 0 ||
compilerVersion.indexOf("gdc") === 0;
}
processAstOutput(output) {
output = output.stdout;
output = output.map(x => x.text);
// Top level decls start with |- or `-
const topLevelRegex = /^([|`])-/;
// Refers to the user's source file rather than a system header
const sourceRegex = /<source>/g;
// Refers to whatever the most recent file specified was
const lineRegex = /<line:/;
let mostRecentIsSource = false;
// Remove all AST nodes which aren't directly from the user's source code
for (let i = 0; i < output.length; ++i) {
if (output[i].match(topLevelRegex)) {
if (output[i].match(lineRegex) && mostRecentIsSource) {
//do nothing
}
// This is a system header or implicit definition,
// remove everything up to the next top level decl
else if (!output[i].match(sourceRegex)) {
// Top level decls with invalid sloc as the file don't change the most recent file
let slocRegex = /<<invalid sloc>>/;
if (!output[i].match(slocRegex)) {
mostRecentIsSource = false;
}
let spliceMax = i + 1;
while (output[spliceMax] && !output[spliceMax].match(topLevelRegex)) {
spliceMax++;
}
output.splice(i, spliceMax - i);
--i;
}
else {
mostRecentIsSource = true;
}
}
}
output = output.join('\n');
// Filter out the symbol addresses
const addressRegex = /^([^A-Za-z]*[A-Za-z]+) 0x[a-z0-9]+/mg;
output = output.replace(addressRegex, '$1');
// Filter out <invalid sloc> and <<invalid sloc>>
let slocRegex = / ?<?<invalid sloc>>?/g;
output = output.replace(slocRegex, '');
// Unify file references
output = output.replace(sourceRegex, 'line');
return output;
}
processGccDumpOutput(opts, result) {
const rootDir = path.dirname(result.inputFilename);
const allFiles = fs.readdirSync(rootDir);
const base = path.basename(result.inputFilename);
if (opts.treeDump === false && opts.rtlDump === false) {
return {
all: [],
selectedPass: "",
currentPassOutput: 'Nothing selected for dump:\nselect at least one of Tree/RTL filter',
syntaxHighlight: false
};
}
const allPasses = [];
for (let i in allFiles) {
const pass_str_idx = allFiles[i].indexOf(`${base}.`);
if (pass_str_idx !== -1) {
allPasses.push(allFiles[i].substring(base.length + 1));
}
}
const output = {
all: allPasses,
selectedPass: opts.pass,
currentPassOutput: '<No pass selected>',
syntaxHighlight: false
};
if (opts.pass) {
const passDump = `${result.inputFilename}.${opts.pass}`;
if (fs.existsSync(passDump) && fs.statSync(passDump).isFile()) {
output.currentPassOutput = fs.readFileSync(passDump, 'utf-8');
if (output.currentPassOutput.match(/^\s*$/)) {
output.currentPassOutput = 'File for selected pass is empty.';
} else {
output.syntaxHighlight = true;
}
} else {
// most probably filter has changed and the request is outdated.
output.currentPassOutput = `Pass '${output.selectedPass}' was requested
but is not valid anymore with current filters.
Please select another pass or change filters.`;
output.selectedPass = "";
}
}
return output;
}
execPostProcess(result, postProcesses, outputFilename, maxSize) {
const postCommand = `cat "${outputFilename}" | ${postProcesses.join(" | ")}`;
return this.exec("bash", ["-c", postCommand], {maxOutput: maxSize})
.then(postResult => this.handlePostProcessResult(result, postResult));
}
postProcess(result, outputFilename, filters) {
const postProcess = _.compact(this.compiler.postProcess);
const maxSize = this.env.ceProps("max-asm-size", 8 * 1024 * 1024);
let optPromise, asmPromise, execPromise;
if (result.hasOptOutput) {
optPromise = this.processOptOutput(result.hasOptOutput, result.optPath);
} else {
optPromise = Promise.resolve("");
}
if (filters.binary && this.supportsObjdump()) {
asmPromise = this.objdump(outputFilename, result, maxSize, filters.intel, filters.demangle);
} else {
asmPromise = this.stat(outputFilename).then(stat => {
if (stat.size >= maxSize) {
result.asm = `<No output: generated assembly was too large (${stat.size} > ${maxSize} bytes)>`;
return result;
}
if (postProcess.length) {
return this.execPostProcess(result, postProcess, outputFilename, maxSize);
} else {
return this.readFile(outputFilename).then(contents => {
result.asm = contents.toString();
return Promise.resolve(result);
});
}
},
() => {
result.asm = "<No output file>";
return result;
});
}
if (filters.execute) {
const maxExecOutputSize = this.env.ceProps("max-executable-output-size", 32 * 1024);
execPromise = this.execBinary(outputFilename, result, maxExecOutputSize);
} else {
execPromise = Promise.resolve("");
}
return Promise.all([asmPromise, optPromise, execPromise]);
}
handlePostProcessResult(result, postResult) {
result.asm = postResult.stdout;
if (postResult.code !== 0) {
result.asm = `<Error during post processing: ${postResult.code}>`;
logger.error("Error during post-processing", result);
}
return result;
}
checkOptions(options) {
const error = this.env.findBadOptions(options);
if (error.length > 0) return `Bad options: ${error.join(", ")}`;
return null;
}
// This check for arbitrary user-controlled preprocessor inclusions
// can be circumvented in more than one way. The goal here is to respond
// to simple attempts with a clear diagnostic; the service still needs to
// assume that malicious actors can make the compiler open arbitrary files.
checkSource(source) {
const re = /^\s*#\s*i(nclude|mport)(_next)?\s+["<](\/|.*\.\.)[">]/;
const failed = [];
utils.splitLines(source).forEach((line, index) => {
if (line.match(re)) {
failed.push(`<stdin>:${index + 1}:1: no absolute or relative includes please`);
}
});
if (failed.length > 0) return failed.join("\n");
return null;
}
getArgumentParser() {
let exe = this.compiler.exe.toLowerCase();
if (exe.indexOf("clang") >= 0) { // check this first as "clang++" matches "g++"
return argumentParsers.Clang;
} else if (exe.indexOf("g++") >= 0 || exe.indexOf("gcc") >= 0) {
return argumentParsers.GCC;
}
//there is a lot of code around that makes this assumption.
//probably not the best thing to do :D
return argumentParsers.GCC;
}
getVersion() {
logger.info(`Gathering ${this.compiler.id} version information on ${this.compiler.exe}`);
const execOptions = this.getDefaultExecOptions();
const versionFlag = this.compiler.versionFlag || '--version';
execOptions.timeoutMs = 0; // No timeout for --version. A sort of workaround for slow EFS/NFS on the prod site
return this.exec(this.compiler.exe, [versionFlag], execOptions);
}
initialise() {
if (!this.asm) this.asm = new asm.AsmParser(this.compilerProps);
if (this.getRemote()) return Promise.resolve(this);
const compiler = this.compiler.exe;
const versionRe = new RegExp(this.compiler.versionRe || '.*', 'i');
return this.env.enqueue(() => {
return this.getVersion();
}).then(result => {
if (result.code !== 0) {
logger.warn(`Compiler '${compiler}' - non-zero result ${result.code}`);
}
let version = "";
_.each(utils.splitLines(result.stdout + result.stderr), line => {
if (version) return;
const match = line.match(versionRe);
if (match) version = match[0];
});
if (!version) {
logger.error(`Unable to find compiler version for '${compiler}':`, result, 'with re', versionRe);
return null;
}
logger.debug(`${compiler} is version '${version}'`);
this.compiler.version = version;
this.compiler.supportsCfg = this.isCfgCompiler(version);
this.compiler.supportsAstView = this.couldSupportASTDump(version);
return this.getArgumentParser().parse(this);
}, err => {
logger.error(`Unable to get version for compiler '${compiler}' - ${err}`);
return null;
});
}
getInfo() {
return this.compiler;
}
getDefaultFilters() {
// TODO; propagate to UI?
return {
intel: true,
commentOnly: true,
directives: true,
labels: true,
optOutput: false
};
}
}
module.exports = BaseCompiler;