Merge pull request #1492 from 0xProject/feature/sol-cov-sol-profiler-sol-trace-divorce

Refactor out sol-cov, sol-profiler and sol-trace into their separate packages

18 files changed, 1468 insertions, 0 deletions

diff --git a/packages/sol-tracing-utils/src/artifact_adapters/abstract_artifact_adapter.ts b/packages/sol-tracing-utils/src/artifact_adapters/abstract_artifact_adapter.ts
new file mode 100644
index 000000000..fcc6562ad
--- /dev/null
+++ b/packages/sol-tracing-utils/src/artifact_adapters/abstract_artifact_adapter.ts
@@ -0,0 +1,5 @@
+import { ContractData } from '../types';
+
+export abstract class AbstractArtifactAdapter {
+    public abstract async collectContractsDataAsync(): Promise<ContractData[]>;
+}
diff --git a/packages/sol-tracing-utils/src/artifact_adapters/sol_compiler_artifact_adapter.ts b/packages/sol-tracing-utils/src/artifact_adapters/sol_compiler_artifact_adapter.ts
new file mode 100644
index 000000000..57391abbe
--- /dev/null
+++ b/packages/sol-tracing-utils/src/artifact_adapters/sol_compiler_artifact_adapter.ts
@@ -0,0 +1,61 @@
+import { logUtils } from '@0x/utils';
+import { CompilerOptions, ContractArtifact } from 'ethereum-types';
+import * as fs from 'fs';
+import * as glob from 'glob';
+import * as _ from 'lodash';
+import * as path from 'path';
+
+import { ContractData } from '../types';
+
+import { AbstractArtifactAdapter } from './abstract_artifact_adapter';
+
+const CONFIG_FILE = 'compiler.json';
+
+export class SolCompilerArtifactAdapter extends AbstractArtifactAdapter {
+    private readonly _artifactsPath: string;
+    private readonly _sourcesPath: string;
+    /**
+     * Instantiates a SolCompilerArtifactAdapter
+     * @param artifactsPath Path to your artifacts directory
+     * @param sourcesPath Path to your contract sources directory
+     */
+    constructor(artifactsPath?: string, sourcesPath?: string) {
+        super();
+        const config: CompilerOptions = fs.existsSync(CONFIG_FILE)
+            ? JSON.parse(fs.readFileSync(CONFIG_FILE).toString())
+            : {};
+        if (_.isUndefined(artifactsPath) && _.isUndefined(config.artifactsDir)) {
+            throw new Error(`artifactsDir not found in ${CONFIG_FILE}`);
+        }
+        this._artifactsPath = (artifactsPath || config.artifactsDir) as string;
+        if (_.isUndefined(sourcesPath) && _.isUndefined(config.contractsDir)) {
+            throw new Error(`contractsDir not found in ${CONFIG_FILE}`);
+        }
+        this._sourcesPath = (sourcesPath || config.contractsDir) as string;
+    }
+    public async collectContractsDataAsync(): Promise<ContractData[]> {
+        const artifactsGlob = `${this._artifactsPath}/**/*.json`;
+        const artifactFileNames = glob.sync(artifactsGlob, { absolute: true });
+        const contractsData: ContractData[] = [];
+        for (const artifactFileName of artifactFileNames) {
+            const artifact: ContractArtifact = JSON.parse(fs.readFileSync(artifactFileName).toString());
+            if (_.isUndefined(artifact.compilerOutput.evm)) {
+                logUtils.warn(`${artifactFileName} doesn't contain bytecode. Skipping...`);
+                continue;
+            }
+            let sources = _.keys(artifact.sources);
+            sources = _.map(sources, relativeFilePath => path.resolve(this._sourcesPath, relativeFilePath));
+            const sourceCodes = _.map(sources, (source: string) => fs.readFileSync(source).toString());
+            const contractData = {
+                sourceCodes,
+                sources,
+                bytecode: artifact.compilerOutput.evm.bytecode.object,
+                sourceMap: artifact.compilerOutput.evm.bytecode.sourceMap,
+                runtimeBytecode: artifact.compilerOutput.evm.deployedBytecode.object,
+                sourceMapRuntime: artifact.compilerOutput.evm.deployedBytecode.sourceMap,
+            };
+            contractsData.push(contractData);
+        }
+        return contractsData;
+    }
+}
diff --git a/packages/sol-tracing-utils/src/artifact_adapters/truffle_artifact_adapter.ts b/packages/sol-tracing-utils/src/artifact_adapters/truffle_artifact_adapter.ts
new file mode 100644
index 000000000..bb2b15153
--- /dev/null
+++ b/packages/sol-tracing-utils/src/artifact_adapters/truffle_artifact_adapter.ts
@@ -0,0 +1,88 @@
+import { Compiler, CompilerOptions } from '@0x/sol-compiler';
+import * as fs from 'fs';
+import * as glob from 'glob';
+import * as path from 'path';
+
+import { ContractData } from '../types';
+
+import { AbstractArtifactAdapter } from './abstract_artifact_adapter';
+import { SolCompilerArtifactAdapter } from './sol_compiler_artifact_adapter';
+
+const DEFAULT_TRUFFLE_ARTIFACTS_DIR = './build/contracts';
+
+interface TruffleConfig {
+    solc?: any;
+    contracts_build_directory?: string;
+}
+
+export class TruffleArtifactAdapter extends AbstractArtifactAdapter {
+    private readonly _solcVersion: string;
+    private readonly _projectRoot: string;
+    /**
+     * Instantiates a TruffleArtifactAdapter
+     * @param projectRoot Path to the truffle project's root directory
+     * @param solcVersion Solidity version with which to compile all the contracts
+     */
+    constructor(projectRoot: string, solcVersion: string) {
+        super();
+        this._solcVersion = solcVersion;
+        this._projectRoot = projectRoot;
+    }
+    public async collectContractsDataAsync(): Promise<ContractData[]> {
+        const artifactsDir = '.0x-artifacts';
+        const contractsDir = path.join(this._projectRoot, 'contracts');
+        const truffleConfig = this._getTruffleConfig();
+        const solcConfig = truffleConfig.solc || {};
+        const truffleArtifactsDirectory = truffleConfig.contracts_build_directory || DEFAULT_TRUFFLE_ARTIFACTS_DIR;
+        this._assertSolidityVersionIsCorrect(truffleArtifactsDirectory);
+        const compilerOptions: CompilerOptions = {
+            contractsDir,
+            artifactsDir,
+            compilerSettings: {
+                ...solcConfig,
+                outputSelection: {
+                    ['*']: {
+                        ['*']: ['abi', 'evm.bytecode.object', 'evm.deployedBytecode.object'],
+                    },
+                },
+            },
+            contracts: '*',
+            solcVersion: this._solcVersion,
+        };
+        const compiler = new Compiler(compilerOptions);
+        await compiler.compileAsync();
+        const solCompilerArtifactAdapter = new SolCompilerArtifactAdapter(artifactsDir, contractsDir);
+        const contractsDataFrom0xArtifacts = await solCompilerArtifactAdapter.collectContractsDataAsync();
+        return contractsDataFrom0xArtifacts;
+    }
+    private _getTruffleConfig(): TruffleConfig {
+        const truffleConfigFileShort = path.resolve(path.join(this._projectRoot, 'truffle.js'));
+        const truffleConfigFileLong = path.resolve(path.join(this._projectRoot, 'truffle-config.js'));
+        if (fs.existsSync(truffleConfigFileShort)) {
+            const truffleConfig = require(truffleConfigFileShort);
+            return truffleConfig;
+        } else if (fs.existsSync(truffleConfigFileLong)) {
+            const truffleConfig = require(truffleConfigFileLong);
+            return truffleConfig;
+        } else {
+            throw new Error(
+                `Neither ${truffleConfigFileShort} nor ${truffleConfigFileLong} exists. Make sure the project root is correct`,
+            );
+        }
+    }
+    private _assertSolidityVersionIsCorrect(truffleArtifactsDirectory: string): void {
+        const artifactsGlob = `${truffleArtifactsDirectory}/**/*.json`;
+        const artifactFileNames = glob.sync(artifactsGlob, { absolute: true });
+        for (const artifactFileName of artifactFileNames) {
+            const artifact = JSON.parse(fs.readFileSync(artifactFileName).toString());
+            const compilerVersion = artifact.compiler.version;
+            if (!compilerVersion.startsWith(this._solcVersion)) {
+                throw new Error(
+                    `${artifact.contractName} was compiled with solidity ${compilerVersion} but specified version is ${
+                        this._solcVersion
+                    } making it impossible to process traces`,
+                );
+            }
+        }
+    }
+}
diff --git a/packages/sol-tracing-utils/src/ast_visitor.ts b/packages/sol-tracing-utils/src/ast_visitor.ts
new file mode 100644
index 000000000..e55cdf6ec
--- /dev/null
+++ b/packages/sol-tracing-utils/src/ast_visitor.ts
@@ -0,0 +1,168 @@
+import * as _ from 'lodash';
+import * as Parser from 'solidity-parser-antlr';
+
+import { BranchMap, FnMap, LocationByOffset, SingleFileSourceRange, StatementMap } from './types';
+
+export interface CoverageEntriesDescription {
+    fnMap: FnMap;
+    branchMap: BranchMap;
+    statementMap: StatementMap;
+    modifiersStatementIds: number[];
+}
+
+enum BranchType {
+    If = 'if',
+    ConditionalExpression = 'cond-expr',
+    BinaryExpression = 'binary-expr',
+}
+
+export class ASTVisitor {
+    private _entryId = 0;
+    private readonly _fnMap: FnMap = {};
+    private readonly _branchMap: BranchMap = {};
+    private readonly _modifiersStatementIds: number[] = [];
+    private readonly _statementMap: StatementMap = {};
+    private readonly _locationByOffset: LocationByOffset;
+    private readonly _ignoreRangesBeginningAt: number[];
+    // keep track of contract/function ranges that are to be ignored
+    // so we can also ignore any children nodes within the contract/function
+    private readonly _ignoreRangesWithin: Array<[number, number]> = [];
+    constructor(locationByOffset: LocationByOffset, ignoreRangesBeginningAt: number[] = []) {
+        this._locationByOffset = locationByOffset;
+        this._ignoreRangesBeginningAt = ignoreRangesBeginningAt;
+    }
+    public getCollectedCoverageEntries(): CoverageEntriesDescription {
+        const coverageEntriesDescription = {
+            fnMap: this._fnMap,
+            branchMap: this._branchMap,
+            statementMap: this._statementMap,
+            modifiersStatementIds: this._modifiersStatementIds,
+        };
+        return coverageEntriesDescription;
+    }
+    public IfStatement(ast: Parser.IfStatement): void {
+        this._visitStatement(ast);
+        this._visitBinaryBranch(ast, ast.trueBody, ast.falseBody || ast, BranchType.If);
+    }
+    public FunctionDefinition(ast: Parser.FunctionDefinition): void {
+        this._visitFunctionLikeDefinition(ast);
+    }
+    public ContractDefinition(ast: Parser.ContractDefinition): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            this._ignoreRangesWithin.push(ast.range as [number, number]);
+        }
+    }
+    public ModifierDefinition(ast: Parser.ModifierDefinition): void {
+        this._visitFunctionLikeDefinition(ast);
+    }
+    public ForStatement(ast: Parser.ForStatement): void {
+        this._visitStatement(ast);
+    }
+    public ReturnStatement(ast: Parser.ReturnStatement): void {
+        this._visitStatement(ast);
+    }
+    public BreakStatement(ast: Parser.BreakStatement): void {
+        this._visitStatement(ast);
+    }
+    public ContinueStatement(ast: Parser.ContinueStatement): void {
+        this._visitStatement(ast);
+    }
+    public EmitStatement(ast: any /* TODO: Parser.EmitStatement */): void {
+        this._visitStatement(ast);
+    }
+    public VariableDeclarationStatement(ast: Parser.VariableDeclarationStatement): void {
+        this._visitStatement(ast);
+    }
+    public Statement(ast: Parser.Statement): void {
+        this._visitStatement(ast);
+    }
+    public WhileStatement(ast: Parser.WhileStatement): void {
+        this._visitStatement(ast);
+    }
+    public SimpleStatement(ast: Parser.SimpleStatement): void {
+        this._visitStatement(ast);
+    }
+    public ThrowStatement(ast: Parser.ThrowStatement): void {
+        this._visitStatement(ast);
+    }
+    public DoWhileStatement(ast: Parser.DoWhileStatement): void {
+        this._visitStatement(ast);
+    }
+    public ExpressionStatement(ast: Parser.ExpressionStatement): void {
+        this._visitStatement(ast.expression);
+    }
+    public InlineAssemblyStatement(ast: Parser.InlineAssemblyStatement): void {
+        this._visitStatement(ast);
+    }
+    public BinaryOperation(ast: Parser.BinaryOperation): void {
+        const BRANCHING_BIN_OPS = ['&&', '||'];
+        if (_.includes(BRANCHING_BIN_OPS, ast.operator)) {
+            this._visitBinaryBranch(ast, ast.left, ast.right, BranchType.BinaryExpression);
+        }
+    }
+    public Conditional(ast: Parser.Conditional): void {
+        this._visitBinaryBranch(ast, ast.trueExpression, ast.falseExpression, BranchType.ConditionalExpression);
+    }
+    public ModifierInvocation(ast: Parser.ModifierInvocation): void {
+        const BUILTIN_MODIFIERS = ['public', 'view', 'payable', 'external', 'internal', 'pure', 'constant'];
+        if (!_.includes(BUILTIN_MODIFIERS, ast.name)) {
+            if (this._shouldIgnoreExpression(ast)) {
+                return;
+            }
+            this._modifiersStatementIds.push(this._entryId);
+            this._visitStatement(ast);
+        }
+    }
+    private _visitBinaryBranch(
+        ast: Parser.ASTNode,
+        left: Parser.ASTNode,
+        right: Parser.ASTNode,
+        type: BranchType,
+    ): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            return;
+        }
+        this._branchMap[this._entryId++] = {
+            line: this._getExpressionRange(ast).start.line,
+            type,
+            locations: [this._getExpressionRange(left), this._getExpressionRange(right)],
+        };
+    }
+    private _visitStatement(ast: Parser.ASTNode): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            return;
+        }
+        this._statementMap[this._entryId++] = this._getExpressionRange(ast);
+    }
+    private _getExpressionRange(ast: Parser.ASTNode): SingleFileSourceRange {
+        const astRange = ast.range as [number, number];
+        const start = this._locationByOffset[astRange[0]];
+        const end = this._locationByOffset[astRange[1] + 1];
+        const range = {
+            start,
+            end,
+        };
+        return range;
+    }
+    private _shouldIgnoreExpression(ast: Parser.ASTNode): boolean {
+        const [astStart, astEnd] = ast.range as [number, number];
+        const isRangeIgnored = _.some(
+            this._ignoreRangesWithin,
+            ([rangeStart, rangeEnd]: [number, number]) => astStart >= rangeStart && astEnd <= rangeEnd,
+        );
+        return this._ignoreRangesBeginningAt.includes(astStart) || isRangeIgnored;
+    }
+    private _visitFunctionLikeDefinition(ast: Parser.ModifierDefinition | Parser.FunctionDefinition): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            this._ignoreRangesWithin.push(ast.range as [number, number]);
+            return;
+        }
+        const loc = this._getExpressionRange(ast);
+        this._fnMap[this._entryId++] = {
+            name: ast.name,
+            line: loc.start.line,
+            loc,
+        };
+        this._visitStatement(ast);
+    }
+}
diff --git a/packages/sol-tracing-utils/src/collect_coverage_entries.ts b/packages/sol-tracing-utils/src/collect_coverage_entries.ts
new file mode 100644
index 000000000..bdbcd613e
--- /dev/null
+++ b/packages/sol-tracing-utils/src/collect_coverage_entries.ts
@@ -0,0 +1,41 @@
+import * as ethUtil from 'ethereumjs-util';
+import * as _ from 'lodash';
+import * as parser from 'solidity-parser-antlr';
+
+import { ASTVisitor, CoverageEntriesDescription } from './ast_visitor';
+import { getLocationByOffset } from './source_maps';
+
+const IGNORE_RE = /\/\*\s*solcov\s+ignore\s+next\s*\*\/\s*/gm;
+
+// Parsing source code for each transaction/code is slow and therefore we cache it
+const coverageEntriesBySourceHash: { [sourceHash: string]: CoverageEntriesDescription } = {};
+
+export const collectCoverageEntries = (contractSource: string) => {
+    const sourceHash = ethUtil.sha3(contractSource).toString('hex');
+    if (_.isUndefined(coverageEntriesBySourceHash[sourceHash]) && !_.isUndefined(contractSource)) {
+        const ast = parser.parse(contractSource, { range: true });
+        const locationByOffset = getLocationByOffset(contractSource);
+        const ignoreRangesBegingingAt = gatherRangesToIgnore(contractSource);
+        const visitor = new ASTVisitor(locationByOffset, ignoreRangesBegingingAt);
+        parser.visit(ast, visitor);
+        coverageEntriesBySourceHash[sourceHash] = visitor.getCollectedCoverageEntries();
+    }
+    const coverageEntriesDescription = coverageEntriesBySourceHash[sourceHash];
+    return coverageEntriesDescription;
+};
+
+// Gather the start index of all code blocks preceeded by "/* solcov ignore next */"
+function gatherRangesToIgnore(contractSource: string): number[] {
+    const ignoreRangesStart = [];
+
+    let match;
+    do {
+        match = IGNORE_RE.exec(contractSource);
+        if (match) {
+            const matchLen = match[0].length;
+            ignoreRangesStart.push(match.index + matchLen);
+        }
+    } while (match);
+
+    return ignoreRangesStart;
+}
diff --git a/packages/sol-tracing-utils/src/constants.ts b/packages/sol-tracing-utils/src/constants.ts
new file mode 100644
index 000000000..34d62b537
--- /dev/null
+++ b/packages/sol-tracing-utils/src/constants.ts
@@ -0,0 +1,8 @@
+// tslint:disable:number-literal-format
+export const constants = {
+    NEW_CONTRACT: 'NEW_CONTRACT' as 'NEW_CONTRACT',
+    PUSH1: 0x60,
+    PUSH2: 0x61,
+    PUSH32: 0x7f,
+    TIMESTAMP: 0x42,
+};
diff --git a/packages/sol-tracing-utils/src/get_source_range_snippet.ts b/packages/sol-tracing-utils/src/get_source_range_snippet.ts
new file mode 100644
index 000000000..f578675d3
--- /dev/null
+++ b/packages/sol-tracing-utils/src/get_source_range_snippet.ts
@@ -0,0 +1,185 @@
+import * as ethUtil from 'ethereumjs-util';
+import * as _ from 'lodash';
+import * as Parser from 'solidity-parser-antlr';
+
+import { SingleFileSourceRange, SourceRange, SourceSnippet } from './types';
+import { utils } from './utils';
+
+interface ASTInfo {
+    type: string;
+    node: Parser.ASTNode;
+    name: string | null;
+    range?: SingleFileSourceRange;
+}
+
+// Parsing source code for each transaction/code is slow and therefore we cache it
+const parsedSourceByHash: { [sourceHash: string]: Parser.ASTNode } = {};
+
+/**
+ * Gets the source range snippet by source range to be used by revert trace.
+ * @param sourceRange source range
+ * @param sourceCode source code
+ */
+export function getSourceRangeSnippet(sourceRange: SourceRange, sourceCode: string): SourceSnippet | null {
+    const sourceHash = ethUtil.sha3(sourceCode).toString('hex');
+    if (_.isUndefined(parsedSourceByHash[sourceHash])) {
+        parsedSourceByHash[sourceHash] = Parser.parse(sourceCode, { loc: true });
+    }
+    const astNode = parsedSourceByHash[sourceHash];
+    const visitor = new ASTInfoVisitor();
+    Parser.visit(astNode, visitor);
+    const astInfo = visitor.getASTInfoForRange(sourceRange);
+    if (astInfo === null) {
+        return null;
+    }
+    const sourceCodeInRange = utils.getRange(sourceCode, sourceRange.location);
+    return {
+        ...astInfo,
+        range: astInfo.range as SingleFileSourceRange,
+        source: sourceCodeInRange,
+        fileName: sourceRange.fileName,
+    };
+}
+
+// A visitor which collects ASTInfo for most nodes in the AST.
+class ASTInfoVisitor {
+    private readonly _astInfos: ASTInfo[] = [];
+    public getASTInfoForRange(sourceRange: SourceRange): ASTInfo | null {
+        // HACK(albrow): Sometimes the source range doesn't exactly match that
+        // of astInfo. To work around that we try with a +/-1 offset on
+        // end.column. If nothing matches even with the offset, we return null.
+        const offset = {
+            start: {
+                line: 0,
+                column: 0,
+            },
+            end: {
+                line: 0,
+                column: 0,
+            },
+        };
+        let astInfo = this._getASTInfoForRange(sourceRange, offset);
+        if (astInfo !== null) {
+            return astInfo;
+        }
+        offset.end.column += 1;
+        astInfo = this._getASTInfoForRange(sourceRange, offset);
+        if (astInfo !== null) {
+            return astInfo;
+        }
+        offset.end.column -= 2;
+        astInfo = this._getASTInfoForRange(sourceRange, offset);
+        if (astInfo !== null) {
+            return astInfo;
+        }
+        return null;
+    }
+    public ContractDefinition(ast: Parser.ContractDefinition): void {
+        this._visitContractDefinition(ast);
+    }
+    public IfStatement(ast: Parser.IfStatement): void {
+        this._visitStatement(ast);
+    }
+    public FunctionDefinition(ast: Parser.FunctionDefinition): void {
+        this._visitFunctionLikeDefinition(ast);
+    }
+    public ModifierDefinition(ast: Parser.ModifierDefinition): void {
+        this._visitFunctionLikeDefinition(ast);
+    }
+    public ForStatement(ast: Parser.ForStatement): void {
+        this._visitStatement(ast);
+    }
+    public ReturnStatement(ast: Parser.ReturnStatement): void {
+        this._visitStatement(ast);
+    }
+    public BreakStatement(ast: Parser.BreakStatement): void {
+        this._visitStatement(ast);
+    }
+    public ContinueStatement(ast: Parser.ContinueStatement): void {
+        this._visitStatement(ast);
+    }
+    public EmitStatement(ast: any /* TODO: Parser.EmitStatement */): void {
+        this._visitStatement(ast);
+    }
+    public VariableDeclarationStatement(ast: Parser.VariableDeclarationStatement): void {
+        this._visitStatement(ast);
+    }
+    public Statement(ast: Parser.Statement): void {
+        this._visitStatement(ast);
+    }
+    public WhileStatement(ast: Parser.WhileStatement): void {
+        this._visitStatement(ast);
+    }
+    public SimpleStatement(ast: Parser.SimpleStatement): void {
+        this._visitStatement(ast);
+    }
+    public ThrowStatement(ast: Parser.ThrowStatement): void {
+        this._visitStatement(ast);
+    }
+    public DoWhileStatement(ast: Parser.DoWhileStatement): void {
+        this._visitStatement(ast);
+    }
+    public ExpressionStatement(ast: Parser.ExpressionStatement): void {
+        this._visitStatement(ast.expression);
+    }
+    public InlineAssemblyStatement(ast: Parser.InlineAssemblyStatement): void {
+        this._visitStatement(ast);
+    }
+    public ModifierInvocation(ast: Parser.ModifierInvocation): void {
+        const BUILTIN_MODIFIERS = ['public', 'view', 'payable', 'external', 'internal', 'pure', 'constant'];
+        if (!_.includes(BUILTIN_MODIFIERS, ast.name)) {
+            this._visitStatement(ast);
+        }
+    }
+    private _visitStatement(ast: Parser.ASTNode): void {
+        this._astInfos.push({
+            type: ast.type,
+            node: ast,
+            name: null,
+            range: ast.loc,
+        });
+    }
+    private _visitFunctionLikeDefinition(ast: Parser.ModifierDefinition | Parser.FunctionDefinition): void {
+        this._astInfos.push({
+            type: ast.type,
+            node: ast,
+            name: ast.name,
+            range: ast.loc,
+        });
+    }
+    private _visitContractDefinition(ast: Parser.ContractDefinition): void {
+        this._astInfos.push({
+            type: ast.type,
+            node: ast,
+            name: ast.name,
+            range: ast.loc,
+        });
+    }
+    private _getASTInfoForRange(sourceRange: SourceRange, offset: SingleFileSourceRange): ASTInfo | null {
+        const offsetSourceRange = {
+            ...sourceRange,
+            location: {
+                start: {
+                    line: sourceRange.location.start.line + offset.start.line,
+                    column: sourceRange.location.start.column + offset.start.column,
+                },
+                end: {
+                    line: sourceRange.location.end.line + offset.end.line,
+                    column: sourceRange.location.end.column + offset.end.column,
+                },
+            },
+        };
+        for (const astInfo of this._astInfos) {
+            const astInfoRange = astInfo.range as SingleFileSourceRange;
+            if (
+                astInfoRange.start.column === offsetSourceRange.location.start.column &&
+                astInfoRange.start.line === offsetSourceRange.location.start.line &&
+                astInfoRange.end.column === offsetSourceRange.location.end.column &&
+                astInfoRange.end.line === offsetSourceRange.location.end.line
+            ) {
+                return astInfo;
+            }
+        }
+        return null;
+    }
+}
diff --git a/packages/sol-tracing-utils/src/globals.d.ts b/packages/sol-tracing-utils/src/globals.d.ts
new file mode 100644
index 000000000..e799b3529
--- /dev/null
+++ b/packages/sol-tracing-utils/src/globals.d.ts
@@ -0,0 +1,7 @@
+// tslint:disable:completed-docs
+declare module '*.json' {
+    const json: any;
+    /* tslint:disable */
+    export default json;
+    /* tslint:enable */
+}
diff --git a/packages/sol-tracing-utils/src/index.ts b/packages/sol-tracing-utils/src/index.ts
new file mode 100644
index 000000000..413e5305e
--- /dev/null
+++ b/packages/sol-tracing-utils/src/index.ts
@@ -0,0 +1,39 @@
+export { SolCompilerArtifactAdapter } from './artifact_adapters/sol_compiler_artifact_adapter';
+export { TruffleArtifactAdapter } from './artifact_adapters/truffle_artifact_adapter';
+export { AbstractArtifactAdapter } from './artifact_adapters/abstract_artifact_adapter';
+
+export {
+    ContractData,
+    EvmCallStack,
+    SourceRange,
+    SourceSnippet,
+    StatementCoverage,
+    StatementDescription,
+    BranchCoverage,
+    BranchDescription,
+    Subtrace,
+    TraceInfo,
+    Coverage,
+    LineColumn,
+    LineCoverage,
+    FunctionCoverage,
+    FunctionDescription,
+    SingleFileSourceRange,
+    BranchMap,
+    EvmCallStackEntry,
+    FnMap,
+    LocationByOffset,
+    StatementMap,
+    TraceInfoBase,
+    TraceInfoExistingContract,
+    TraceInfoNewContract,
+} from './types';
+export { collectCoverageEntries } from './collect_coverage_entries';
+export { TraceCollector, SingleFileSubtraceHandler } from './trace_collector';
+export { TraceInfoSubprovider } from './trace_info_subprovider';
+export { utils } from './utils';
+export { constants } from './constants';
+export { parseSourceMap } from './source_maps';
+export { getSourceRangeSnippet } from './get_source_range_snippet';
+export { getRevertTrace } from './revert_trace';
+export { TraceCollectionSubprovider } from './trace_collection_subprovider';
diff --git a/packages/sol-tracing-utils/src/instructions.ts b/packages/sol-tracing-utils/src/instructions.ts
new file mode 100644
index 000000000..40987dbe5
--- /dev/null
+++ b/packages/sol-tracing-utils/src/instructions.ts
@@ -0,0 +1,23 @@
+import { constants } from './constants';
+
+const isPush = (inst: number) => inst >= constants.PUSH1 && inst <= constants.PUSH32;
+
+const pushDataLength = (inst: number) => inst - constants.PUSH1 + 1;
+
+const instructionLength = (inst: number) => (isPush(inst) ? pushDataLength(inst) + 1 : 1);
+
+export const getPcToInstructionIndexMapping = (bytecode: Uint8Array) => {
+    const result: {
+        [programCounter: number]: number;
+    } = {};
+    let byteIndex = 0;
+    let instructionIndex = 0;
+    while (byteIndex < bytecode.length) {
+        const instruction = bytecode[byteIndex];
+        const length = instructionLength(instruction);
+        result[byteIndex] = instructionIndex;
+        byteIndex += length;
+        instructionIndex += 1;
+    }
+    return result;
+};
diff --git a/packages/sol-tracing-utils/src/revert_trace.ts b/packages/sol-tracing-utils/src/revert_trace.ts
new file mode 100644
index 000000000..4d474120c
--- /dev/null
+++ b/packages/sol-tracing-utils/src/revert_trace.ts
@@ -0,0 +1,95 @@
+import { logUtils } from '@0x/utils';
+import { OpCode, StructLog } from 'ethereum-types';
+
+import * as _ from 'lodash';
+
+import { EvmCallStack } from './types';
+import { utils } from './utils';
+
+/**
+ * Converts linear trace to a call stack by following calls and returns
+ * @param structLogs Linear trace
+ * @param startAddress The address of initial context
+ */
+export function getRevertTrace(structLogs: StructLog[], startAddress: string): EvmCallStack {
+    const evmCallStack: EvmCallStack = [];
+    const addressStack = [startAddress];
+    if (_.isEmpty(structLogs)) {
+        return [];
+    }
+    const normalizedStructLogs = utils.normalizeStructLogs(structLogs);
+    // tslint:disable-next-line:prefer-for-of
+    for (let i = 0; i < normalizedStructLogs.length; i++) {
+        const structLog = normalizedStructLogs[i];
+        if (structLog.depth !== addressStack.length - 1) {
+            throw new Error("Malformed trace. Trace depth doesn't match call stack depth");
+        }
+        // After that check we have a guarantee that call stack is never empty
+        // If it would: callStack.length - 1 === structLog.depth === -1
+        // That means that we can always safely pop from it
+
+        if (utils.isCallLike(structLog.op)) {
+            const currentAddress = _.last(addressStack) as string;
+            const jumpAddressOffset = 1;
+            const newAddress = utils.getAddressFromStackEntry(
+                structLog.stack[structLog.stack.length - jumpAddressOffset - 1],
+            );
+
+            // Sometimes calls don't change the execution context (current address). When we do a transfer to an
+            // externally owned account - it does the call and immediately returns because there is no fallback
+            // function. We manually check if the call depth had changed to handle that case.
+            const nextStructLog = normalizedStructLogs[i + 1];
+            if (nextStructLog.depth !== structLog.depth) {
+                addressStack.push(newAddress);
+                evmCallStack.push({
+                    address: currentAddress,
+                    structLog,
+                });
+            }
+        } else if (utils.isEndOpcode(structLog.op) && structLog.op !== OpCode.Revert) {
+            // Just like with calls, sometimes returns/stops don't change the execution context (current address).
+            const nextStructLog = normalizedStructLogs[i + 1];
+            if (_.isUndefined(nextStructLog) || nextStructLog.depth !== structLog.depth) {
+                evmCallStack.pop();
+                addressStack.pop();
+            }
+            if (structLog.op === OpCode.SelfDestruct) {
+                // After contract execution, we look at all sub-calls to external contracts, and for each one, fetch
+                // the bytecode and compute the coverage for the call. If the contract is destroyed with a call
+                // to `selfdestruct`, we are unable to fetch it's bytecode and compute coverage.
+                // TODO: Refactor this logic to fetch the sub-called contract bytecode before the selfdestruct is called
+                // in order to handle this edge-case.
+                logUtils.warn(
+                    "Detected a selfdestruct. We currently do not support that scenario. We'll just skip the trace part for a destructed contract",
+                );
+            }
+        } else if (structLog.op === OpCode.Revert) {
+            evmCallStack.push({
+                address: _.last(addressStack) as string,
+                structLog,
+            });
+            return evmCallStack;
+        } else if (structLog.op === OpCode.Create) {
+            // TODO: Extract the new contract address from the stack and handle that scenario
+            logUtils.warn(
+                "Detected a contract created from within another contract. We currently do not support that scenario. We'll just skip that trace",
+            );
+            return [];
+        } else {
+            if (structLog !== _.last(normalizedStructLogs)) {
+                const nextStructLog = normalizedStructLogs[i + 1];
+                if (nextStructLog.depth === structLog.depth) {
+                    continue;
+                } else if (nextStructLog.depth === structLog.depth - 1) {
+                    addressStack.pop();
+                } else {
+                    throw new Error('Malformed trace. Unexpected call depth change');
+                }
+            }
+        }
+    }
+    if (evmCallStack.length !== 0) {
+        logUtils.warn('Malformed trace. Call stack non empty at the end. (probably out of gas)');
+    }
+    return [];
+}
diff --git a/packages/sol-tracing-utils/src/source_maps.ts b/packages/sol-tracing-utils/src/source_maps.ts
new file mode 100644
index 000000000..af0fb4035
--- /dev/null
+++ b/packages/sol-tracing-utils/src/source_maps.ts
@@ -0,0 +1,91 @@
+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 map 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;
+}
diff --git a/packages/sol-tracing-utils/src/trace.ts b/packages/sol-tracing-utils/src/trace.ts
new file mode 100644
index 000000000..770080af3
--- /dev/null
+++ b/packages/sol-tracing-utils/src/trace.ts
@@ -0,0 +1,104 @@
+import { logUtils } from '@0x/utils';
+import { OpCode, StructLog } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { utils } from './utils';
+
+export interface TraceByContractAddress {
+    [contractAddress: string]: StructLog[];
+}
+
+/**
+ * Converts linear stack trace to `TraceByContractAddress`.
+ * @param structLogs stack trace
+ * @param startAddress initial context address
+ */
+export function getTracesByContractAddress(structLogs: StructLog[], startAddress: string): TraceByContractAddress {
+    const traceByContractAddress: TraceByContractAddress = {};
+    let currentTraceSegment = [];
+    const addressStack = [startAddress];
+    if (_.isEmpty(structLogs)) {
+        return traceByContractAddress;
+    }
+    const normalizedStructLogs = utils.normalizeStructLogs(structLogs);
+    // tslint:disable-next-line:prefer-for-of
+    for (let i = 0; i < normalizedStructLogs.length; i++) {
+        const structLog = normalizedStructLogs[i];
+        if (structLog.depth !== addressStack.length - 1) {
+            throw new Error("Malformed trace. Trace depth doesn't match call stack depth");
+        }
+        // After that check we have a guarantee that call stack is never empty
+        // If it would: callStack.length - 1 === structLog.depth === -1
+        // That means that we can always safely pop from it
+        currentTraceSegment.push(structLog);
+
+        if (utils.isCallLike(structLog.op)) {
+            const currentAddress = _.last(addressStack) as string;
+            const jumpAddressOffset = 1;
+            const newAddress = utils.getAddressFromStackEntry(
+                structLog.stack[structLog.stack.length - jumpAddressOffset - 1],
+            );
+
+            // Sometimes calls don't change the execution context (current address). When we do a transfer to an
+            // externally owned account - it does the call and immediately returns because there is no fallback
+            // function. We manually check if the call depth had changed to handle that case.
+            const nextStructLog = normalizedStructLogs[i + 1];
+            if (nextStructLog.depth !== structLog.depth) {
+                addressStack.push(newAddress);
+                traceByContractAddress[currentAddress] = (traceByContractAddress[currentAddress] || []).concat(
+                    currentTraceSegment,
+                );
+                currentTraceSegment = [];
+            }
+        } else if (utils.isEndOpcode(structLog.op)) {
+            const currentAddress = addressStack.pop() as string;
+            traceByContractAddress[currentAddress] = (traceByContractAddress[currentAddress] || []).concat(
+                currentTraceSegment,
+            );
+            currentTraceSegment = [];
+            if (structLog.op === OpCode.SelfDestruct) {
+                // After contract execution, we look at all sub-calls to external contracts, and for each one, fetch
+                // the bytecode and compute the coverage for the call. If the contract is destroyed with a call
+                // to `selfdestruct`, we are unable to fetch it's bytecode and compute coverage.
+                // TODO: Refactor this logic to fetch the sub-called contract bytecode before the selfdestruct is called
+                // in order to handle this edge-case.
+                logUtils.warn(
+                    "Detected a selfdestruct. We currently do not support that scenario. We'll just skip the trace part for a destructed contract",
+                );
+            }
+        } else if (structLog.op === OpCode.Create) {
+            // TODO: Extract the new contract address from the stack and handle that scenario
+            logUtils.warn(
+                "Detected a contract created from within another contract. We currently do not support that scenario. We'll just skip that trace",
+            );
+            return traceByContractAddress;
+        } else {
+            if (structLog !== _.last(normalizedStructLogs)) {
+                const nextStructLog = normalizedStructLogs[i + 1];
+                if (nextStructLog.depth === structLog.depth) {
+                    continue;
+                } else if (nextStructLog.depth === structLog.depth - 1) {
+                    const currentAddress = addressStack.pop() as string;
+                    traceByContractAddress[currentAddress] = (traceByContractAddress[currentAddress] || []).concat(
+                        currentTraceSegment,
+                    );
+                    currentTraceSegment = [];
+                } else {
+                    throw new Error('Malformed trace. Unexpected call depth change');
+                }
+            }
+        }
+    }
+    if (addressStack.length !== 0) {
+        logUtils.warn('Malformed trace. Call stack non empty at the end');
+    }
+    if (currentTraceSegment.length !== 0) {
+        const currentAddress = addressStack.pop() as string;
+        traceByContractAddress[currentAddress] = (traceByContractAddress[currentAddress] || []).concat(
+            currentTraceSegment,
+        );
+        currentTraceSegment = [];
+        logUtils.warn('Malformed trace. Current trace segment non empty at the end');
+    }
+    return traceByContractAddress;
+}
diff --git a/packages/sol-tracing-utils/src/trace_collection_subprovider.ts b/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
new file mode 100644
index 000000000..25e38768d
--- /dev/null
+++ b/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
@@ -0,0 +1,188 @@
+import { BlockchainLifecycle } from '@0x/dev-utils';
+import { Callback, ErrorCallback, NextCallback, Subprovider } from '@0x/subproviders';
+import { CallDataRPC, marshaller, Web3Wrapper } from '@0x/web3-wrapper';
+import { JSONRPCRequestPayload, Provider, TxData } from 'ethereum-types';
+import * as _ from 'lodash';
+import { Lock } from 'semaphore-async-await';
+
+import { constants } from './constants';
+import { BlockParamLiteral } from './types';
+
+interface MaybeFakeTxData extends TxData {
+    isFakeTransaction?: boolean;
+}
+
+const BLOCK_GAS_LIMIT = 6000000;
+
+export interface TraceCollectionSubproviderConfig {
+    shouldCollectTransactionTraces: boolean;
+    shouldCollectCallTraces: boolean;
+    shouldCollectGasEstimateTraces: boolean;
+}
+
+// Because there is no notion of a call trace in the Ethereum rpc - we collect them in a rather non-obvious/hacky way.
+// On each call - we create a snapshot, execute the call as a transaction, get the trace, revert the snapshot.
+// That allows us to avoid influencing test behaviour.
+
+/**
+ * This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
+ * It collects traces of all transactions that were sent and all calls that were executed through JSON RPC. It must
+ * be extended by implementing the _recordTxTraceAsync method which is called for every transaction.
+ */
+export abstract class TraceCollectionSubprovider extends Subprovider {
+    protected _web3Wrapper!: Web3Wrapper;
+    // Lock is used to not accept normal transactions while doing call/snapshot magic because they'll be reverted later otherwise
+    private readonly _lock = new Lock();
+    private readonly _defaultFromAddress: string;
+    private _isEnabled = true;
+    private readonly _config: TraceCollectionSubproviderConfig;
+    /**
+     * Instantiates a TraceCollectionSubprovider instance
+     * @param defaultFromAddress default from address to use when sending transactions
+     */
+    constructor(defaultFromAddress: string, config: TraceCollectionSubproviderConfig) {
+        super();
+        this._defaultFromAddress = defaultFromAddress;
+        this._config = config;
+    }
+    /**
+     * Starts trace collection
+     */
+    public start(): void {
+        this._isEnabled = true;
+    }
+    /**
+     * Stops trace collection
+     */
+    public stop(): void {
+        this._isEnabled = false;
+    }
+    /**
+     * This method conforms to the web3-provider-engine interface.
+     * It is called internally by the ProviderEngine when it is this subproviders
+     * turn to handle a JSON RPC request.
+     * @param payload JSON RPC payload
+     * @param next Callback to call if this subprovider decides not to handle the request
+     * @param _end Callback to call if subprovider handled the request and wants to pass back the request.
+     */
+    // tslint:disable-next-line:prefer-function-over-method async-suffix
+    public async handleRequest(payload: JSONRPCRequestPayload, next: NextCallback, _end: ErrorCallback): Promise<void> {
+        if (this._isEnabled) {
+            switch (payload.method) {
+                case 'eth_sendTransaction':
+                    if (!this._config.shouldCollectTransactionTraces) {
+                        next();
+                    } else {
+                        const txData = payload.params[0];
+                        next(this._onTransactionSentAsync.bind(this, txData));
+                    }
+                    return;
+
+                case 'eth_call':
+                    if (!this._config.shouldCollectCallTraces) {
+                        next();
+                    } else {
+                        const callData = payload.params[0];
+                        next(this._onCallOrGasEstimateExecutedAsync.bind(this, callData));
+                    }
+                    return;
+
+                case 'eth_estimateGas':
+                    if (!this._config.shouldCollectGasEstimateTraces) {
+                        next();
+                    } else {
+                        const estimateGasData = payload.params[0];
+                        next(this._onCallOrGasEstimateExecutedAsync.bind(this, estimateGasData));
+                    }
+                    return;
+
+                default:
+                    next();
+                    return;
+            }
+        } else {
+            next();
+            return;
+        }
+    }
+    /**
+     * Set's the subprovider's engine to the ProviderEngine it is added to.
+     * This is only called within the ProviderEngine source code, do not call
+     * directly.
+     * @param engine The ProviderEngine this subprovider is added to
+     */
+    public setEngine(engine: Provider): void {
+        super.setEngine(engine);
+        this._web3Wrapper = new Web3Wrapper(engine);
+    }
+    protected abstract async _recordTxTraceAsync(
+        address: string,
+        data: string | undefined,
+        txHash: string,
+    ): Promise<void>;
+    private async _onTransactionSentAsync(
+        txData: MaybeFakeTxData,
+        err: Error | null,
+        txHash: string | undefined,
+        cb: Callback,
+    ): Promise<void> {
+        if (!txData.isFakeTransaction) {
+            // This transaction is a usual transaction. Not a call executed as one.
+            // And we don't want it to be executed within a snapshotting period
+            await this._lock.acquire();
+        }
+        const NULL_ADDRESS = '0x0';
+        if (_.isNull(err)) {
+            const toAddress =
+                _.isUndefined(txData.to) || txData.to === NULL_ADDRESS ? constants.NEW_CONTRACT : txData.to;
+            await this._recordTxTraceAsync(toAddress, txData.data, txHash as string);
+        } else {
+            const latestBlock = await this._web3Wrapper.getBlockWithTransactionDataAsync(BlockParamLiteral.Latest);
+            const transactions = latestBlock.transactions;
+            for (const transaction of transactions) {
+                const toAddress =
+                    _.isUndefined(txData.to) || txData.to === NULL_ADDRESS ? constants.NEW_CONTRACT : txData.to;
+                await this._recordTxTraceAsync(toAddress, transaction.input, transaction.hash);
+            }
+        }
+        if (!txData.isFakeTransaction) {
+            // This transaction is a usual transaction. Not a call executed as one.
+            // And we don't want it to be executed within a snapshotting period
+            this._lock.release();
+        }
+        cb();
+    }
+    private async _onCallOrGasEstimateExecutedAsync(
+        callData: Partial<CallDataRPC>,
+        _err: Error | null,
+        _callResult: string,
+        cb: Callback,
+    ): Promise<void> {
+        await this._recordCallOrGasEstimateTraceAsync(callData);
+        cb();
+    }
+    private async _recordCallOrGasEstimateTraceAsync(callData: Partial<CallDataRPC>): Promise<void> {
+        // We don't want other transactions to be exeucted during snashotting period, that's why we lock the
+        // transaction execution for all transactions except our fake ones.
+        await this._lock.acquire();
+        const blockchainLifecycle = new BlockchainLifecycle(this._web3Wrapper);
+        await blockchainLifecycle.startAsync();
+        const fakeTxData = {
+            gas: BLOCK_GAS_LIMIT.toString(16), // tslint:disable-line:custom-no-magic-numbers
+            isFakeTransaction: true, // This transaction (and only it) is allowed to come through when the lock is locked
+            ...callData,
+            from: callData.from || this._defaultFromAddress,
+        };
+        try {
+            const txData = marshaller.unmarshalTxData(fakeTxData);
+            const txHash = await this._web3Wrapper.sendTransactionAsync(txData);
+            await this._web3Wrapper.awaitTransactionMinedAsync(txHash, 0);
+        } catch (err) {
+            // TODO(logvinov) Check that transaction failed and not some other exception
+            // Even if this transaction failed - we've already recorded it's trace.
+            _.noop();
+        }
+        await blockchainLifecycle.revertAsync();
+        this._lock.release();
+    }
+}
diff --git a/packages/sol-tracing-utils/src/trace_collector.ts b/packages/sol-tracing-utils/src/trace_collector.ts
new file mode 100644
index 000000000..943e208cf
--- /dev/null
+++ b/packages/sol-tracing-utils/src/trace_collector.ts
@@ -0,0 +1,93 @@
+import { promisify } from '@0x/utils';
+import { stripHexPrefix } from 'ethereumjs-util';
+import * as fs from 'fs';
+import { Collector } from 'istanbul';
+import * as _ from 'lodash';
+import { getLogger, levels, Logger } from 'loglevel';
+import * as mkdirp from 'mkdirp';
+
+import { AbstractArtifactAdapter } from './artifact_adapters/abstract_artifact_adapter';
+import { constants } from './constants';
+import { parseSourceMap } from './source_maps';
+import {
+    ContractData,
+    Coverage,
+    SourceRange,
+    Subtrace,
+    TraceInfo,
+    TraceInfoExistingContract,
+    TraceInfoNewContract,
+} from './types';
+import { utils } from './utils';
+
+const mkdirpAsync = promisify<undefined>(mkdirp);
+
+export type SingleFileSubtraceHandler = (
+    contractData: ContractData,
+    subtrace: Subtrace,
+    pcToSourceRange: { [programCounter: number]: SourceRange },
+    fileIndex: number,
+) => Coverage;
+
+/**
+ * TraceCollector is used by CoverageSubprovider to compute code coverage based on collected trace data.
+ */
+export class TraceCollector {
+    private readonly _artifactAdapter: AbstractArtifactAdapter;
+    private readonly _logger: Logger;
+    private _contractsData!: ContractData[];
+    private readonly _collector = new Collector();
+    private readonly _singleFileSubtraceHandler: SingleFileSubtraceHandler;
+
+    /**
+     * Instantiates a TraceCollector instance
+     * @param artifactAdapter Adapter for used artifacts format (0x, truffle, giveth, etc.)
+     * @param isVerbose If true, we will log any unknown transactions. Otherwise we will ignore them
+     * @param singleFileSubtraceHandler A handler function for computing partial coverage for a single file & subtrace
+     */
+    constructor(
+        artifactAdapter: AbstractArtifactAdapter,
+        isVerbose: boolean,
+        singleFileSubtraceHandler: SingleFileSubtraceHandler,
+    ) {
+        this._artifactAdapter = artifactAdapter;
+        this._logger = getLogger('sol-tracing-utils');
+        this._logger.setLevel(isVerbose ? levels.TRACE : levels.ERROR);
+        this._singleFileSubtraceHandler = singleFileSubtraceHandler;
+    }
+    public async writeOutputAsync(): Promise<void> {
+        const finalCoverage = this._collector.getFinalCoverage();
+        const stringifiedCoverage = JSON.stringify(finalCoverage, null, '\t');
+        await mkdirpAsync('coverage');
+        fs.writeFileSync('coverage/coverage.json', stringifiedCoverage);
+    }
+    public async computeSingleTraceCoverageAsync(traceInfo: TraceInfo): Promise<void> {
+        if (_.isUndefined(this._contractsData)) {
+            this._contractsData = await this._artifactAdapter.collectContractsDataAsync();
+        }
+        const isContractCreation = traceInfo.address === constants.NEW_CONTRACT;
+        const bytecode = isContractCreation
+            ? (traceInfo as TraceInfoNewContract).bytecode
+            : (traceInfo as TraceInfoExistingContract).runtimeBytecode;
+        const contractData = utils.getContractDataIfExists(this._contractsData, bytecode);
+        if (_.isUndefined(contractData)) {
+            const errMsg = isContractCreation
+                ? `Unknown contract creation transaction`
+                : `Transaction to an unknown address: ${traceInfo.address}`;
+            this._logger.warn(errMsg);
+            return;
+        }
+        const bytecodeHex = stripHexPrefix(bytecode);
+        const sourceMap = isContractCreation ? contractData.sourceMap : contractData.sourceMapRuntime;
+        const pcToSourceRange = parseSourceMap(contractData.sourceCodes, sourceMap, bytecodeHex, contractData.sources);
+        for (let fileIndex = 0; fileIndex < contractData.sources.length; fileIndex++) {
+            const singleFileCoverageForTrace = this._singleFileSubtraceHandler(
+                contractData,
+                traceInfo.subtrace,
+                pcToSourceRange,
+                fileIndex,
+            );
+            this._collector.add(singleFileCoverageForTrace);
+        }
+    }
+}
diff --git a/packages/sol-tracing-utils/src/trace_info_subprovider.ts b/packages/sol-tracing-utils/src/trace_info_subprovider.ts
new file mode 100644
index 000000000..635a68f58
--- /dev/null
+++ b/packages/sol-tracing-utils/src/trace_info_subprovider.ts
@@ -0,0 +1,59 @@
+import * as _ from 'lodash';
+
+import { constants } from './constants';
+import { getTracesByContractAddress } from './trace';
+import { TraceCollectionSubprovider } from './trace_collection_subprovider';
+import { TraceInfo, TraceInfoExistingContract, TraceInfoNewContract } from './types';
+
+// TraceInfoSubprovider is extended by subproviders which need to work with one
+// TraceInfo at a time. It has one abstract method: _handleTraceInfoAsync, which
+// is called for each TraceInfo.
+export abstract class TraceInfoSubprovider extends TraceCollectionSubprovider {
+    protected abstract _handleTraceInfoAsync(traceInfo: TraceInfo): Promise<void>;
+    protected async _recordTxTraceAsync(address: string, data: string | undefined, txHash: string): Promise<void> {
+        await this._web3Wrapper.awaitTransactionMinedAsync(txHash, 0);
+        const trace = await this._web3Wrapper.getTransactionTraceAsync(txHash, {
+            disableMemory: true,
+            disableStack: false,
+            disableStorage: true,
+        });
+        const tracesByContractAddress = getTracesByContractAddress(trace.structLogs, address);
+        const subcallAddresses = _.keys(tracesByContractAddress);
+        if (address === constants.NEW_CONTRACT) {
+            for (const subcallAddress of subcallAddresses) {
+                let traceInfo: TraceInfoNewContract | TraceInfoExistingContract;
+                if (subcallAddress === 'NEW_CONTRACT') {
+                    const traceForThatSubcall = tracesByContractAddress[subcallAddress];
+                    traceInfo = {
+                        subtrace: traceForThatSubcall,
+                        txHash,
+                        address: subcallAddress,
+                        bytecode: data as string,
+                    };
+                } else {
+                    const runtimeBytecode = await this._web3Wrapper.getContractCodeAsync(subcallAddress);
+                    const traceForThatSubcall = tracesByContractAddress[subcallAddress];
+                    traceInfo = {
+                        subtrace: traceForThatSubcall,
+                        txHash,
+                        address: subcallAddress,
+                        runtimeBytecode,
+                    };
+                }
+                await this._handleTraceInfoAsync(traceInfo);
+            }
+        } else {
+            for (const subcallAddress of subcallAddresses) {
+                const runtimeBytecode = await this._web3Wrapper.getContractCodeAsync(subcallAddress);
+                const traceForThatSubcall = tracesByContractAddress[subcallAddress];
+                const traceInfo: TraceInfoExistingContract = {
+                    subtrace: traceForThatSubcall,
+                    txHash,
+                    address: subcallAddress,
+                    runtimeBytecode,
+                };
+                await this._handleTraceInfoAsync(traceInfo);
+            }
+        }
+    }
+}
diff --git a/packages/sol-tracing-utils/src/types.ts b/packages/sol-tracing-utils/src/types.ts
new file mode 100644
index 000000000..54ade0400
--- /dev/null
+++ b/packages/sol-tracing-utils/src/types.ts
@@ -0,0 +1,126 @@
+import { StructLog } from 'ethereum-types';
+import * as Parser from 'solidity-parser-antlr';
+
+export interface LineColumn {
+    line: number;
+    column: number;
+}
+
+export interface SourceRange {
+    location: SingleFileSourceRange;
+    fileName: string;
+}
+
+export interface SingleFileSourceRange {
+    start: LineColumn;
+    end: LineColumn;
+}
+
+export interface LocationByOffset {
+    [offset: number]: LineColumn;
+}
+
+export interface FunctionDescription {
+    name: string;
+    line: number;
+    loc: SingleFileSourceRange;
+    skip?: boolean;
+}
+
+export type StatementDescription = SingleFileSourceRange;
+
+export interface BranchDescription {
+    line: number;
+    type: 'if' | 'switch' | 'cond-expr' | 'binary-expr';
+    locations: SingleFileSourceRange[];
+}
+
+export interface FnMap {
+    [functionId: string]: FunctionDescription;
+}
+
+export interface BranchMap {
+    [branchId: string]: BranchDescription;
+}
+
+export interface StatementMap {
+    [statementId: string]: StatementDescription;
+}
+
+export interface LineCoverage {
+    [lineNo: number]: number;
+}
+
+export interface FunctionCoverage {
+    [functionId: string]: number;
+}
+
+export interface StatementCoverage {
+    [statementId: string]: number;
+}
+
+export interface BranchCoverage {
+    [branchId: string]: number[];
+}
+
+export interface Coverage {
+    [fineName: string]: {
+        l?: LineCoverage;
+        f: FunctionCoverage;
+        s: StatementCoverage;
+        b: BranchCoverage;
+        fnMap: FnMap;
+        branchMap: BranchMap;
+        statementMap: StatementMap;
+        path: string;
+    };
+}
+
+export interface ContractData {
+    bytecode: string;
+    sourceMap: string;
+    runtimeBytecode: string;
+    sourceMapRuntime: string;
+    sourceCodes: string[];
+    sources: string[];
+}
+
+// Part of the trace executed within the same context
+export type Subtrace = StructLog[];
+
+export interface TraceInfoBase {
+    subtrace: Subtrace;
+    txHash: string;
+}
+
+export interface TraceInfoNewContract extends TraceInfoBase {
+    address: 'NEW_CONTRACT';
+    bytecode: string;
+}
+
+export interface TraceInfoExistingContract extends TraceInfoBase {
+    address: string;
+    runtimeBytecode: string;
+}
+
+export type TraceInfo = TraceInfoNewContract | TraceInfoExistingContract;
+
+export enum BlockParamLiteral {
+    Latest = 'latest',
+}
+
+export interface EvmCallStackEntry {
+    structLog: StructLog;
+    address: string;
+}
+
+export type EvmCallStack = EvmCallStackEntry[];
+
+export interface SourceSnippet {
+    source: string;
+    fileName: string;
+    type: string;
+    node: Parser.ASTNode;
+    name: string | null;
+    range: SingleFileSourceRange;
+}
diff --git a/packages/sol-tracing-utils/src/utils.ts b/packages/sol-tracing-utils/src/utils.ts
new file mode 100644
index 000000000..d8bc65e73
--- /dev/null
+++ b/packages/sol-tracing-utils/src/utils.ts
@@ -0,0 +1,87 @@
+import { addressUtils, BigNumber } from '@0x/utils';
+import { OpCode, StructLog } from 'ethereum-types';
+import { addHexPrefix } from 'ethereumjs-util';
+import * as _ from 'lodash';
+
+import { ContractData, LineColumn, SingleFileSourceRange } from './types';
+
+// This is the minimum length of valid contract bytecode. The Solidity compiler
+// metadata is 86 bytes. If you add the '0x' prefix, we get 88.
+const MIN_CONTRACT_BYTECODE_LENGTH = 88;
+
+export const utils = {
+    compareLineColumn(lhs: LineColumn, rhs: LineColumn): number {
+        return lhs.line !== rhs.line ? lhs.line - rhs.line : lhs.column - rhs.column;
+    },
+    removeHexPrefix(hex: string): string {
+        const hexPrefix = '0x';
+        return hex.startsWith(hexPrefix) ? hex.slice(hexPrefix.length) : hex;
+    },
+    isRangeInside(childRange: SingleFileSourceRange, parentRange: SingleFileSourceRange): boolean {
+        return (
+            utils.compareLineColumn(parentRange.start, childRange.start) <= 0 &&
+            utils.compareLineColumn(childRange.end, parentRange.end) <= 0
+        );
+    },
+    bytecodeToBytecodeRegex(bytecode: string): string {
+        const bytecodeRegex = bytecode
+            // Library linking placeholder: __ConvertLib____________________________
+            .replace(/_.*_/, '.*')
+            // Last 86 characters is solidity compiler metadata that's different between compilations
+            .replace(/.{86}$/, '')
+            // Libraries contain their own address at the beginning of the code and it's impossible to know it in advance
+            .replace(/^0x730000000000000000000000000000000000000000/, '0x73........................................');
+        // HACK: Node regexes can't be longer that 32767 characters. Contracts bytecode can. We just truncate the regexes. It's safe in practice.
+        const MAX_REGEX_LENGTH = 32767;
+        const truncatedBytecodeRegex = bytecodeRegex.slice(0, MAX_REGEX_LENGTH);
+        return truncatedBytecodeRegex;
+    },
+    getContractDataIfExists(contractsData: ContractData[], bytecode: string): ContractData | undefined {
+        if (!bytecode.startsWith('0x')) {
+            throw new Error(`0x hex prefix missing: ${bytecode}`);
+        }
+        const contractData = _.find(contractsData, contractDataCandidate => {
+            const bytecodeRegex = utils.bytecodeToBytecodeRegex(contractDataCandidate.bytecode);
+            // If the bytecode is less than the minimum length, we are probably
+            // dealing with an interface. This isn't what we're looking for.
+            if (bytecodeRegex.length < MIN_CONTRACT_BYTECODE_LENGTH) {
+                return false;
+            }
+            const runtimeBytecodeRegex = utils.bytecodeToBytecodeRegex(contractDataCandidate.runtimeBytecode);
+            if (runtimeBytecodeRegex.length < MIN_CONTRACT_BYTECODE_LENGTH) {
+                return false;
+            }
+            // We use that function to find by bytecode or runtimeBytecode. Those are quasi-random strings so
+            // collisions are practically impossible and it allows us to reuse that code
+            return !_.isNull(bytecode.match(bytecodeRegex)) || !_.isNull(bytecode.match(runtimeBytecodeRegex));
+        });
+        return contractData;
+    },
+    isCallLike(op: OpCode): boolean {
+        return _.includes([OpCode.CallCode, OpCode.StaticCall, OpCode.Call, OpCode.DelegateCall], op);
+    },
+    isEndOpcode(op: OpCode): boolean {
+        return _.includes([OpCode.Return, OpCode.Stop, OpCode.Revert, OpCode.Invalid, OpCode.SelfDestruct], op);
+    },
+    getAddressFromStackEntry(stackEntry: string): string {
+        const hexBase = 16;
+        return addressUtils.padZeros(new BigNumber(addHexPrefix(stackEntry)).toString(hexBase));
+    },
+    normalizeStructLogs(structLogs: StructLog[]): StructLog[] {
+        if (structLogs[0].depth === 1) {
+            // Geth uses 1-indexed depth counter whilst ganache starts from 0
+            const newStructLogs = _.map(structLogs, structLog => ({
+                ...structLog,
+                depth: structLog.depth - 1,
+            }));
+            return newStructLogs;
+        }
+        return structLogs;
+    },
+    getRange(sourceCode: string, range: SingleFileSourceRange): string {
+        const lines = sourceCode.split('\n').slice(range.start.line - 1, range.end.line);
+        lines[lines.length - 1] = lines[lines.length - 1].slice(0, range.end.column);
+        lines[0] = lines[0].slice(range.start.column);
+        return lines.join('\n');
+    },
+};