lib/asm-parser-dart.js

// Copyright (c) 2022, Compiler Explorer Authors
// All rights reserved.
//
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import { AsmParser } from './asm-parser';
import { AsmRegex } from './asmregex';

import * as utils from './utils';

export class DartAsmParser extends AsmParser {
    constructor() {
        super();

        this.lineRe = /^(file:)?(\/[^:]+):(?<line>\d+).*/;
    }

    processBinaryAsm(asmResult, filters) {
        const startTime = process.hrtime.bigint();
        const asm = [];
        const labelDefinitions = {};
        const dontMaskFilenames = filters.dontMaskFilenames;

        let asmLines = asmResult.split('\n');
        const startingLineCount = asmLines.length;
        let source = null;
        let func = null;
        let mayRemovePreviousLabel = filters.libraryCode;

        function maybeRemovePreviousLabel() {
            if (mayRemovePreviousLabel) {
                const previousLabelStart = labelDefinitions[func];
                if (previousLabelStart) {
                    asm.splice(previousLabelStart - 1);
                }
            }
        }

        // Handle "error" documents.
        if (asmLines.length === 1 && asmLines[0][0] === '<') {
            return {
                asm: [{text: asmLines[0], source: null}],
            };
        }

        if (filters.preProcessBinaryAsmLines !== undefined) {
            asmLines = filters.preProcessBinaryAsmLines(asmLines);
        }

        for (const line of asmLines) {
            const labelsInLine = [];

            if (asm.length >= this.maxAsmLines) {
                if (asm.length === this.maxAsmLines) {
                    asm.push({
                        text: '[truncated; too many lines]',
                        source: null,
                        labels: labelsInLine,
                    });
                }
                continue;
            }
            let match = line.match(this.lineRe);
            if (match) {
                if (dontMaskFilenames) {
                    source = {
                        file: utils.maskRootdir(match[1]),
                        line: parseInt(match.groups.line),
                        mainsource: true,
                    };
                } else {
                    source = {file: null, line: parseInt(match.groups.line), mainsource: true};
                }
                continue;
            }

            match = line.match(this.labelRe);
            if (match) {
                maybeRemovePreviousLabel();
                mayRemovePreviousLabel = filters.libraryCode;
                source = null;
                func = match[2];
                if (this.isUserFunction(func)) {
                    asm.push({
                        text: func + ':',
                        source: null,
                        labels: labelsInLine,
                    });
                    labelDefinitions[func] = asm.length;
                }
                continue;
            }

            if (func && line === `${func}():`) continue;

            if (!func || !this.isUserFunction(func)) continue;

            // note: normally the source.file will be null if it's code from example.ext
            //  but with filters.dontMaskFilenames it will be filled with the actual filename
            //  instead we can test source.mainsource in that situation
            const isMainsource = source && ((source.file === null) || source.mainsource);
            if (isMainsource) {
                mayRemovePreviousLabel = false;
            }

            match = line.match(this.asmOpcodeRe);
            if (match) {
                const address = parseInt(match.groups.address, 16);
                const opcodes = match.groups.opcodes.split(' ').filter(x => !!x);
                const disassembly = ' ' + AsmRegex.filterAsmLine(match.groups.disasm, filters);
                const destMatch = line.match(this.destRe);
                if (destMatch) {
                    const labelName = destMatch[2];
                    const startCol = disassembly.indexOf(labelName) + 1;
                    labelsInLine.push({
                        name: labelName,
                        range: {
                            startCol: startCol,
                            endCol: startCol + labelName.length,
                        },
                    });
                }
                asm.push({
                    opcodes: opcodes,
                    address: address,
                    text: disassembly,
                    source: source,
                    labels: labelsInLine,
                });
            }
        }

        maybeRemovePreviousLabel();

        this.removeLabelsWithoutDefinition(asm, labelDefinitions);

        const endTime = process.hrtime.bigint();

        return {
            asm: asm,
            labelDefinitions: labelDefinitions,
            parsingTime: ((endTime - startTime) / BigInt(1000000)).toString(),
            filteredCount: startingLineCount - asm.length,
        };
    }
}