add support for erlang to beam bytecode (#3094)gh-1286

* add support for erlang to beam bytecode

* changed call by 'this' to overridden functions

* Update base-compiler.js

Co-authored-by: Patrick Quist <partouf@gmail.com>

6 files changed, 134 insertions, 0 deletions

diff --git a/etc/config/erlang.defaults.properties b/etc/config/erlang.defaults.properties
new file mode 100644
index 000000000..b6fb121ad
--- /dev/null
+++ b/etc/config/erlang.defaults.properties
@@ -0,0 +1,20 @@
+# Default settings for Erlang
+compilers=&erlang
+compilerType=erlang
+versionFlag=
+objdumper=
+instructionSet=beam
+
+group.erlang.compilers=erlcdefault
+compiler.erlcdefault.exe=/usr/bin/erl
+compiler.erlcdefault.runtime=/usr/bin/erl
+compiler.erlcdefault.name=erl default
+
+defaultCompiler=erlcdefault
+demangler=
+postProcess=
+options=-S
+supportsBinary=false
+needsMulti=false
+supportsExecute=false
+interpreted=true
diff --git a/examples/erlang/default.erl b/examples/erlang/default.erl
new file mode 100644
index 000000000..163980025
--- /dev/null
+++ b/examples/erlang/default.erl
@@ -0,0 +1,4 @@
+-module(square).
+-export([square/1]).
+
+square(A) -> A*A.
diff --git a/lib/compilers/_all.js b/lib/compilers/_all.js
index 1e2139374..bc99138c8 100644
--- a/lib/compilers/_all.js
+++ b/lib/compilers/_all.js
@@ -37,6 +37,7 @@ export { CrystalCompiler } from './crystal';
 export { DefaultCompiler } from './default';
 export { DMDCompiler } from './dmd';
 export { EllccCompiler } from './ellcc';
+export { ErlangCompiler } from './erlang';
 export { EWARMCompiler } from './ewarm';
 export { EWAVRCompiler } from './ewavr';
 export { FakeCompiler } from './fake-for-test';
diff --git a/lib/compilers/argument-parsers.js b/lib/compilers/argument-parsers.js
index 1944711a1..aeed08a50 100644
--- a/lib/compilers/argument-parsers.js
+++ b/lib/compilers/argument-parsers.js
@@ -157,6 +157,13 @@ export class ClangParser extends BaseParser {
     }
 }
 
+export class ErlangParser extends BaseParser {
+    static async parse(compiler) {
+        await ErlangParser.getOptions(compiler, '-help');
+        return compiler;
+    }
+}
+
 export class PascalParser extends BaseParser {
     static async parse(compiler) {
         await PascalParser.getOptions(compiler, '-help');
diff --git a/lib/compilers/erlang.js b/lib/compilers/erlang.js
new file mode 100644
index 000000000..b844b822b
--- /dev/null
+++ b/lib/compilers/erlang.js
@@ -0,0 +1,96 @@
+// Copyright (c) 2021, Compiler Explorer Authors
+// 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.
+
+import path from 'path';
+
+import { BaseCompiler } from '../base-compiler';
+import { logger } from '../logger';
+
+import { ErlangParser } from './argument-parsers';
+
+export class ErlangCompiler extends BaseCompiler {
+    static get key() { return 'erlang'; }
+
+    /* eslint-disable no-unused-vars */
+    optionsForFilter(filters, outputFilename) {
+        return [
+            '-noshell',
+            '-eval',
+            '{ok, Input} = init:get_argument(input),' +
+                '{ok, _, Output} = compile:file(Input, [\'S\', binary, no_line_info, report]),' +
+                'Binary = io_lib:format("~p", [Output]),' +
+                `file:write_file("${outputFilename}", list_to_binary(Binary)),` +
+                'halt().',
+        ];
+    }
+    /* eslint-enable no-unused-vars */
+
+    async runCompiler(compiler, options, inputFilename, execOptions) {
+        if (!execOptions) {
+            execOptions = this.getDefaultExecOptions();
+        }
+
+        if (!execOptions.customCwd) {
+            execOptions.customCwd = path.dirname(inputFilename);
+        }
+
+        const result = await this.exec(compiler, options.concat(['-input', inputFilename]), execOptions);
+        result.inputFilename = inputFilename;
+        const transformedInput = result.filenameTransform(inputFilename);
+        this.parseCompilationOutput(result, transformedInput);
+        return result;
+    }
+    
+    
+    getVersion() {
+        logger.info(`Gathering ${this.compiler.id} version information on ${this.compiler.exe}...`);
+        if (this.compiler.explicitVersion) {
+            logger.debug(`${this.compiler.id} has forced version output: ${this.compiler.explicitVersion}`);
+            return {stdout: [this.compiler.explicitVersion], stderr: [], code: 0};
+        }
+        const execOptions = this.getDefaultExecOptions();
+        const versionCmd = this.compilerProps(`compiler.${this.compiler.id}.runtime`);
+        execOptions.timeoutMs = 0; // No timeout for --version. A sort of workaround for slow EFS/NFS on the prod site
+        execOptions.ldPath = this.getSharedLibraryPathsAsLdLibraryPaths([]);
+        
+        try {
+            return this.execCompilerCached(
+                versionCmd,
+                ['-noshell', '-eval', 'io:fwrite("~s~n", [erlang:system_info(otp_release)]), halt().'],
+                execOptions,
+            );
+        } catch (err) {
+            logger.error(`Unable to get version for compiler '${this.compiler.exe}' - ${err}`);
+            return null;
+        }
+    }
+        
+    getOutputFilename(dirPath, outputFilebase) {
+        return path.join(dirPath, `${outputFilebase}.S`);
+    }
+
+    getArgumentParser() {
+        return ErlangParser;
+    }
+}
diff --git a/lib/languages.js b/lib/languages.js
index ddd22c4cf..cc54de978 100644
--- a/lib/languages.js
+++ b/lib/languages.js
@@ -116,6 +116,12 @@ export const languages = {
         extensions: ['.d'],
         alias: [],
     },
+    erlang: {
+        name: 'Erlang',
+        monaco: 'erlang',
+        extensions: ['.erl', '.hrl'],
+        alias: [],
+    },
     go: {
         name: 'Go',
         monaco: 'go',