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import * as _ from 'lodash';
import { getPcToInstructionIndexMapping } from './instructions';
import { LocationByOffset, SourceRange } from './types';
const RADIX = 10;
export interface SourceLocation {
offset: number;
length: number;
fileIndex: number;
}
/**
* Receives a string with newlines and returns a hash of byte offset to LineColumn
* @param str A string to process
*/
export function getLocationByOffset(str: string): LocationByOffset {
const locationByOffset: LocationByOffset = { 0: { line: 1, column: 0 } };
let currentOffset = 0;
for (const char of str.split('')) {
const location = locationByOffset[currentOffset];
const isNewline = char === '\n';
locationByOffset[currentOffset + 1] = {
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
* @param sourceCodes sources contents
* @param srcMap source map string
* @param bytecodeHex contract bytecode
* @param sources sources file names
*/
export function parseSourceMap(
sourceCodes: string[],
srcMap: string,
bytecodeHex: string,
sources: string[],
): { [programCounter: number]: SourceRange } {
const bytecode = Uint8Array.from(Buffer.from(bytecodeHex, 'hex'));
const pcToInstructionIndex: { [programCounter: number]: number } = getPcToInstructionIndexMapping(bytecode);
const locationByOffsetByFileIndex = _.map(sourceCodes, s => (_.isUndefined(s) ? {} : getLocationByOffset(s)));
const entries = srcMap.split(';');
let lastParsedEntry: SourceLocation = {} as any;
const instructionIndexToSourceRange: { [instructionIndex: number]: SourceRange } = {};
_.each(entries, (entry: string, i: number) => {
// tslint:disable-next-line:no-unused-variable
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 && !_.isUndefined(locationByOffsetByFileIndex[parsedEntry.fileIndex])) {
const sourceRange = {
location: {
start: locationByOffsetByFileIndex[parsedEntry.fileIndex][parsedEntry.offset],
end: locationByOffsetByFileIndex[parsedEntry.fileIndex][parsedEntry.offset + parsedEntry.length],
},
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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