// Copyright (c) 2021, Compiler Explorer Authors
// All rights reserved.
//
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import path from 'path';

import { RustCompiler } from './rust';

export class RustcCgGCCCompiler extends RustCompiler {
    static get key() { return 'rustc-cg-gcc'; }

    constructor(info, env) {
        super(info, env);
        this.compiler.supportsIrView = false;

        // Enable GCC dump code,
        this.compiler.supportsGccDump = true;

        // but do not try to filter out empty dumps:
        // This filtering needs to dump all files but currently libgccjit (used by
        // this rustc backend) and compiler-explorer's use of jails makes this task a bit tricky.
        // The user will be presented more dumps than effectively created.
        // Turning this to 'true' will break the dumps.

        this.compiler.removeEmptyGccDump = false;
    }

    getGccDumpOptions(gccDumpOptions, removeEmptyPasses){
        return [ '-C' , 'llvm-args=' + super.getGccDumpOptions(gccDumpOptions, removeEmptyPasses).join(' ')];
    }

    optionsForFilter(filters, outputFilename, userOptions) {
        // these options are direcly taken from rustc_codegen_gcc doc.
        // See https://github.com/antoyo/rustc_codegen_gcc
        let toolroot = path.resolve(path.dirname(this.compiler.exe), '..');

        let options = ['-C', 'panic=abort',
            '-Z', 'codegen-backend=librustc_codegen_gcc.so',
            '--sysroot', toolroot + '/sysroot' ];

        // rust.js makes the asumption that LLVM is used. This may go away when cranelift is available.
        // Until this is the case and the super() class is refactored, simply ditch -Cllvm arg.
        let super_options = super.optionsForFilter(filters, outputFilename, userOptions).filter(arg => !/-Cllvm.*/.test(arg));
        options = options.concat(super_options);
        return options;
    }
}