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import * as _ from 'lodash';
import { getPcToInstructionIndexMapping } from './instructions';
import { LineColumn, LocationByOffset, SourceRange } from './types';
const RADIX = 10;
export interface SourceLocation {
offset: number;
length: number;
fileIndex: number;
}
export const getLocationByOffset = (str: string) => {
const locationByOffset: LocationByOffset = {};
let currentOffset = 0;
for (const char of str.split('')) {
const location = locationByOffset[currentOffset - 1] || { line: 1, column: 0 };
const isNewline = char === '\n';
locationByOffset[currentOffset] = {
line: location.line + (isNewline ? 1 : 0),
column: isNewline ? 0 : location.column + 1,
};
currentOffset++;
}
return locationByOffset;
};
// Parses a sourcemap string
// The solidity sourcemap format is documented here: https://github.com/ethereum/solidity/blob/develop/docs/miscellaneous.rst#source-mappings
export const parseSourceMap = (sourceCodes: string[], srcMap: string, bytecodeHex: string, sources: string[]) => {
const bytecode = Uint8Array.from(Buffer.from(bytecodeHex, 'hex'));
const pcToInstructionIndex: { [programCounter: number]: number } = getPcToInstructionIndexMapping(bytecode);
const locationByOffsetByFileIndex = _.map(sourceCodes, getLocationByOffset);
const entries = srcMap.split(';');
const parsedEntries: SourceLocation[] = [];
let lastParsedEntry: SourceLocation = {} as any;
const instructionIndexToSourceRange: { [instructionIndex: number]: SourceRange } = {};
_.each(entries, (entry: string, i: number) => {
const [instructionIndexStrIfExists, lengthStrIfExists, fileIndexStrIfExists, jumpTypeStrIfExists] = entry.split(
':',
);
const instructionIndexIfExists = parseInt(instructionIndexStrIfExists, RADIX);
const lengthIfExists = parseInt(lengthStrIfExists, RADIX);
const fileIndexIfExists = parseInt(fileIndexStrIfExists, RADIX);
const offset = _.isNaN(instructionIndexIfExists) ? lastParsedEntry.offset : instructionIndexIfExists;
const length = _.isNaN(lengthIfExists) ? lastParsedEntry.length : lengthIfExists;
const fileIndex = _.isNaN(fileIndexIfExists) ? lastParsedEntry.fileIndex : fileIndexIfExists;
const parsedEntry = {
offset,
length,
fileIndex,
};
if (parsedEntry.fileIndex !== -1) {
const sourceRange = {
location: {
start: locationByOffsetByFileIndex[parsedEntry.fileIndex][parsedEntry.offset - 1],
end:
locationByOffsetByFileIndex[parsedEntry.fileIndex][parsedEntry.offset + parsedEntry.length - 1],
},
fileName: sources[parsedEntry.fileIndex],
};
instructionIndexToSourceRange[i] = sourceRange;
} else {
// Some assembly code generated by Solidity can't be mapped back to a line of source code.
// Source: https://github.com/ethereum/solidity/issues/3629
}
lastParsedEntry = parsedEntry;
});
const pcsToSourceRange: { [programCounter: number]: SourceRange } = {};
for (const programCounterKey of _.keys(pcToInstructionIndex)) {
const pc = parseInt(programCounterKey, RADIX);
const instructionIndex: number = pcToInstructionIndex[pc];
pcsToSourceRange[pc] = instructionIndexToSourceRange[instructionIndex];
}
return pcsToSourceRange;
};
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