853 lines
25 KiB
JavaScript
853 lines
25 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview A class of the code path analyzer.
|
||
|
|
* @author Toru Nagashima
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Requirements
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
const assert = require("assert"),
|
||
|
|
{ breakableTypePattern } = require("../../shared/ast-utils"),
|
||
|
|
CodePath = require("./code-path"),
|
||
|
|
CodePathSegment = require("./code-path-segment"),
|
||
|
|
IdGenerator = require("./id-generator"),
|
||
|
|
debug = require("./debug-helpers");
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Helpers
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not a given node is a `case` node (not `default` node).
|
||
|
|
* @param {ASTNode} node A `SwitchCase` node to check.
|
||
|
|
* @returns {boolean} `true` if the node is a `case` node (not `default` node).
|
||
|
|
*/
|
||
|
|
function isCaseNode(node) {
|
||
|
|
return Boolean(node.test);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks if a given node appears as the value of a PropertyDefinition node.
|
||
|
|
* @param {ASTNode} node THe node to check.
|
||
|
|
* @returns {boolean} `true` if the node is a PropertyDefinition value,
|
||
|
|
* false if not.
|
||
|
|
*/
|
||
|
|
function isPropertyDefinitionValue(node) {
|
||
|
|
const parent = node.parent;
|
||
|
|
|
||
|
|
return parent && parent.type === "PropertyDefinition" && parent.value === node;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether the given logical operator is taken into account for the code
|
||
|
|
* path analysis.
|
||
|
|
* @param {string} operator The operator found in the LogicalExpression node
|
||
|
|
* @returns {boolean} `true` if the operator is "&&" or "||" or "??"
|
||
|
|
*/
|
||
|
|
function isHandledLogicalOperator(operator) {
|
||
|
|
return operator === "&&" || operator === "||" || operator === "??";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether the given assignment operator is a logical assignment operator.
|
||
|
|
* Logical assignments are taken into account for the code path analysis
|
||
|
|
* because of their short-circuiting semantics.
|
||
|
|
* @param {string} operator The operator found in the AssignmentExpression node
|
||
|
|
* @returns {boolean} `true` if the operator is "&&=" or "||=" or "??="
|
||
|
|
*/
|
||
|
|
function isLogicalAssignmentOperator(operator) {
|
||
|
|
return operator === "&&=" || operator === "||=" || operator === "??=";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets the label if the parent node of a given node is a LabeledStatement.
|
||
|
|
* @param {ASTNode} node A node to get.
|
||
|
|
* @returns {string|null} The label or `null`.
|
||
|
|
*/
|
||
|
|
function getLabel(node) {
|
||
|
|
if (node.parent.type === "LabeledStatement") {
|
||
|
|
return node.parent.label.name;
|
||
|
|
}
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not a given logical expression node goes different path
|
||
|
|
* between the `true` case and the `false` case.
|
||
|
|
* @param {ASTNode} node A node to check.
|
||
|
|
* @returns {boolean} `true` if the node is a test of a choice statement.
|
||
|
|
*/
|
||
|
|
function isForkingByTrueOrFalse(node) {
|
||
|
|
const parent = node.parent;
|
||
|
|
|
||
|
|
switch (parent.type) {
|
||
|
|
case "ConditionalExpression":
|
||
|
|
case "IfStatement":
|
||
|
|
case "WhileStatement":
|
||
|
|
case "DoWhileStatement":
|
||
|
|
case "ForStatement":
|
||
|
|
return parent.test === node;
|
||
|
|
|
||
|
|
case "LogicalExpression":
|
||
|
|
return isHandledLogicalOperator(parent.operator);
|
||
|
|
|
||
|
|
case "AssignmentExpression":
|
||
|
|
return isLogicalAssignmentOperator(parent.operator);
|
||
|
|
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets the boolean value of a given literal node.
|
||
|
|
*
|
||
|
|
* This is used to detect infinity loops (e.g. `while (true) {}`).
|
||
|
|
* Statements preceded by an infinity loop are unreachable if the loop didn't
|
||
|
|
* have any `break` statement.
|
||
|
|
* @param {ASTNode} node A node to get.
|
||
|
|
* @returns {boolean|undefined} a boolean value if the node is a Literal node,
|
||
|
|
* otherwise `undefined`.
|
||
|
|
*/
|
||
|
|
function getBooleanValueIfSimpleConstant(node) {
|
||
|
|
if (node.type === "Literal") {
|
||
|
|
return Boolean(node.value);
|
||
|
|
}
|
||
|
|
return void 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks that a given identifier node is a reference or not.
|
||
|
|
*
|
||
|
|
* This is used to detect the first throwable node in a `try` block.
|
||
|
|
* @param {ASTNode} node An Identifier node to check.
|
||
|
|
* @returns {boolean} `true` if the node is a reference.
|
||
|
|
*/
|
||
|
|
function isIdentifierReference(node) {
|
||
|
|
const parent = node.parent;
|
||
|
|
|
||
|
|
switch (parent.type) {
|
||
|
|
case "LabeledStatement":
|
||
|
|
case "BreakStatement":
|
||
|
|
case "ContinueStatement":
|
||
|
|
case "ArrayPattern":
|
||
|
|
case "RestElement":
|
||
|
|
case "ImportSpecifier":
|
||
|
|
case "ImportDefaultSpecifier":
|
||
|
|
case "ImportNamespaceSpecifier":
|
||
|
|
case "CatchClause":
|
||
|
|
return false;
|
||
|
|
|
||
|
|
case "FunctionDeclaration":
|
||
|
|
case "FunctionExpression":
|
||
|
|
case "ArrowFunctionExpression":
|
||
|
|
case "ClassDeclaration":
|
||
|
|
case "ClassExpression":
|
||
|
|
case "VariableDeclarator":
|
||
|
|
return parent.id !== node;
|
||
|
|
|
||
|
|
case "Property":
|
||
|
|
case "PropertyDefinition":
|
||
|
|
case "MethodDefinition":
|
||
|
|
return (
|
||
|
|
parent.key !== node ||
|
||
|
|
parent.computed ||
|
||
|
|
parent.shorthand
|
||
|
|
);
|
||
|
|
|
||
|
|
case "AssignmentPattern":
|
||
|
|
return parent.key !== node;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Updates the current segment with the head segment.
|
||
|
|
* This is similar to local branches and tracking branches of git.
|
||
|
|
*
|
||
|
|
* To separate the current and the head is in order to not make useless segments.
|
||
|
|
*
|
||
|
|
* In this process, both "onCodePathSegmentStart" and "onCodePathSegmentEnd"
|
||
|
|
* events are fired.
|
||
|
|
* @param {CodePathAnalyzer} analyzer The instance.
|
||
|
|
* @param {ASTNode} node The current AST node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function forwardCurrentToHead(analyzer, node) {
|
||
|
|
const codePath = analyzer.codePath;
|
||
|
|
const state = CodePath.getState(codePath);
|
||
|
|
const currentSegments = state.currentSegments;
|
||
|
|
const headSegments = state.headSegments;
|
||
|
|
const end = Math.max(currentSegments.length, headSegments.length);
|
||
|
|
let i, currentSegment, headSegment;
|
||
|
|
|
||
|
|
// Fires leaving events.
|
||
|
|
for (i = 0; i < end; ++i) {
|
||
|
|
currentSegment = currentSegments[i];
|
||
|
|
headSegment = headSegments[i];
|
||
|
|
|
||
|
|
if (currentSegment !== headSegment && currentSegment) {
|
||
|
|
|
||
|
|
const eventName = currentSegment.reachable
|
||
|
|
? "onCodePathSegmentEnd"
|
||
|
|
: "onUnreachableCodePathSegmentEnd";
|
||
|
|
|
||
|
|
debug.dump(`${eventName} ${currentSegment.id}`);
|
||
|
|
|
||
|
|
analyzer.emitter.emit(
|
||
|
|
eventName,
|
||
|
|
currentSegment,
|
||
|
|
node
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Update state.
|
||
|
|
state.currentSegments = headSegments;
|
||
|
|
|
||
|
|
// Fires entering events.
|
||
|
|
for (i = 0; i < end; ++i) {
|
||
|
|
currentSegment = currentSegments[i];
|
||
|
|
headSegment = headSegments[i];
|
||
|
|
|
||
|
|
if (currentSegment !== headSegment && headSegment) {
|
||
|
|
|
||
|
|
const eventName = headSegment.reachable
|
||
|
|
? "onCodePathSegmentStart"
|
||
|
|
: "onUnreachableCodePathSegmentStart";
|
||
|
|
|
||
|
|
debug.dump(`${eventName} ${headSegment.id}`);
|
||
|
|
|
||
|
|
CodePathSegment.markUsed(headSegment);
|
||
|
|
analyzer.emitter.emit(
|
||
|
|
eventName,
|
||
|
|
headSegment,
|
||
|
|
node
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Updates the current segment with empty.
|
||
|
|
* This is called at the last of functions or the program.
|
||
|
|
* @param {CodePathAnalyzer} analyzer The instance.
|
||
|
|
* @param {ASTNode} node The current AST node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function leaveFromCurrentSegment(analyzer, node) {
|
||
|
|
const state = CodePath.getState(analyzer.codePath);
|
||
|
|
const currentSegments = state.currentSegments;
|
||
|
|
|
||
|
|
for (let i = 0; i < currentSegments.length; ++i) {
|
||
|
|
const currentSegment = currentSegments[i];
|
||
|
|
const eventName = currentSegment.reachable
|
||
|
|
? "onCodePathSegmentEnd"
|
||
|
|
: "onUnreachableCodePathSegmentEnd";
|
||
|
|
|
||
|
|
debug.dump(`${eventName} ${currentSegment.id}`);
|
||
|
|
|
||
|
|
analyzer.emitter.emit(
|
||
|
|
eventName,
|
||
|
|
currentSegment,
|
||
|
|
node
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
state.currentSegments = [];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Updates the code path due to the position of a given node in the parent node
|
||
|
|
* thereof.
|
||
|
|
*
|
||
|
|
* For example, if the node is `parent.consequent`, this creates a fork from the
|
||
|
|
* current path.
|
||
|
|
* @param {CodePathAnalyzer} analyzer The instance.
|
||
|
|
* @param {ASTNode} node The current AST node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function preprocess(analyzer, node) {
|
||
|
|
const codePath = analyzer.codePath;
|
||
|
|
const state = CodePath.getState(codePath);
|
||
|
|
const parent = node.parent;
|
||
|
|
|
||
|
|
switch (parent.type) {
|
||
|
|
|
||
|
|
// The `arguments.length == 0` case is in `postprocess` function.
|
||
|
|
case "CallExpression":
|
||
|
|
if (parent.optional === true && parent.arguments.length >= 1 && parent.arguments[0] === node) {
|
||
|
|
state.makeOptionalRight();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case "MemberExpression":
|
||
|
|
if (parent.optional === true && parent.property === node) {
|
||
|
|
state.makeOptionalRight();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "LogicalExpression":
|
||
|
|
if (
|
||
|
|
parent.right === node &&
|
||
|
|
isHandledLogicalOperator(parent.operator)
|
||
|
|
) {
|
||
|
|
state.makeLogicalRight();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "AssignmentExpression":
|
||
|
|
if (
|
||
|
|
parent.right === node &&
|
||
|
|
isLogicalAssignmentOperator(parent.operator)
|
||
|
|
) {
|
||
|
|
state.makeLogicalRight();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ConditionalExpression":
|
||
|
|
case "IfStatement":
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Fork if this node is at `consequent`/`alternate`.
|
||
|
|
* `popForkContext()` exists at `IfStatement:exit` and
|
||
|
|
* `ConditionalExpression:exit`.
|
||
|
|
*/
|
||
|
|
if (parent.consequent === node) {
|
||
|
|
state.makeIfConsequent();
|
||
|
|
} else if (parent.alternate === node) {
|
||
|
|
state.makeIfAlternate();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "SwitchCase":
|
||
|
|
if (parent.consequent[0] === node) {
|
||
|
|
state.makeSwitchCaseBody(false, !parent.test);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "TryStatement":
|
||
|
|
if (parent.handler === node) {
|
||
|
|
state.makeCatchBlock();
|
||
|
|
} else if (parent.finalizer === node) {
|
||
|
|
state.makeFinallyBlock();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "WhileStatement":
|
||
|
|
if (parent.test === node) {
|
||
|
|
state.makeWhileTest(getBooleanValueIfSimpleConstant(node));
|
||
|
|
} else {
|
||
|
|
assert(parent.body === node);
|
||
|
|
state.makeWhileBody();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "DoWhileStatement":
|
||
|
|
if (parent.body === node) {
|
||
|
|
state.makeDoWhileBody();
|
||
|
|
} else {
|
||
|
|
assert(parent.test === node);
|
||
|
|
state.makeDoWhileTest(getBooleanValueIfSimpleConstant(node));
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ForStatement":
|
||
|
|
if (parent.test === node) {
|
||
|
|
state.makeForTest(getBooleanValueIfSimpleConstant(node));
|
||
|
|
} else if (parent.update === node) {
|
||
|
|
state.makeForUpdate();
|
||
|
|
} else if (parent.body === node) {
|
||
|
|
state.makeForBody();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ForInStatement":
|
||
|
|
case "ForOfStatement":
|
||
|
|
if (parent.left === node) {
|
||
|
|
state.makeForInOfLeft();
|
||
|
|
} else if (parent.right === node) {
|
||
|
|
state.makeForInOfRight();
|
||
|
|
} else {
|
||
|
|
assert(parent.body === node);
|
||
|
|
state.makeForInOfBody();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "AssignmentPattern":
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Fork if this node is at `right`.
|
||
|
|
* `left` is executed always, so it uses the current path.
|
||
|
|
* `popForkContext()` exists at `AssignmentPattern:exit`.
|
||
|
|
*/
|
||
|
|
if (parent.right === node) {
|
||
|
|
state.pushForkContext();
|
||
|
|
state.forkBypassPath();
|
||
|
|
state.forkPath();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Updates the code path due to the type of a given node in entering.
|
||
|
|
* @param {CodePathAnalyzer} analyzer The instance.
|
||
|
|
* @param {ASTNode} node The current AST node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function processCodePathToEnter(analyzer, node) {
|
||
|
|
let codePath = analyzer.codePath;
|
||
|
|
let state = codePath && CodePath.getState(codePath);
|
||
|
|
const parent = node.parent;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a new code path and trigger the onCodePathStart event
|
||
|
|
* based on the currently selected node.
|
||
|
|
* @param {string} origin The reason the code path was started.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function startCodePath(origin) {
|
||
|
|
if (codePath) {
|
||
|
|
|
||
|
|
// Emits onCodePathSegmentStart events if updated.
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
debug.dumpState(node, state, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create the code path of this scope.
|
||
|
|
codePath = analyzer.codePath = new CodePath({
|
||
|
|
id: analyzer.idGenerator.next(),
|
||
|
|
origin,
|
||
|
|
upper: codePath,
|
||
|
|
onLooped: analyzer.onLooped
|
||
|
|
});
|
||
|
|
state = CodePath.getState(codePath);
|
||
|
|
|
||
|
|
// Emits onCodePathStart events.
|
||
|
|
debug.dump(`onCodePathStart ${codePath.id}`);
|
||
|
|
analyzer.emitter.emit("onCodePathStart", codePath, node);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Special case: The right side of class field initializer is considered
|
||
|
|
* to be its own function, so we need to start a new code path in this
|
||
|
|
* case.
|
||
|
|
*/
|
||
|
|
if (isPropertyDefinitionValue(node)) {
|
||
|
|
startCodePath("class-field-initializer");
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Intentional fall through because `node` needs to also be
|
||
|
|
* processed by the code below. For example, if we have:
|
||
|
|
*
|
||
|
|
* class Foo {
|
||
|
|
* a = () => {}
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* In this case, we also need start a second code path.
|
||
|
|
*/
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (node.type) {
|
||
|
|
case "Program":
|
||
|
|
startCodePath("program");
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "FunctionDeclaration":
|
||
|
|
case "FunctionExpression":
|
||
|
|
case "ArrowFunctionExpression":
|
||
|
|
startCodePath("function");
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "StaticBlock":
|
||
|
|
startCodePath("class-static-block");
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ChainExpression":
|
||
|
|
state.pushChainContext();
|
||
|
|
break;
|
||
|
|
case "CallExpression":
|
||
|
|
if (node.optional === true) {
|
||
|
|
state.makeOptionalNode();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case "MemberExpression":
|
||
|
|
if (node.optional === true) {
|
||
|
|
state.makeOptionalNode();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "LogicalExpression":
|
||
|
|
if (isHandledLogicalOperator(node.operator)) {
|
||
|
|
state.pushChoiceContext(
|
||
|
|
node.operator,
|
||
|
|
isForkingByTrueOrFalse(node)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "AssignmentExpression":
|
||
|
|
if (isLogicalAssignmentOperator(node.operator)) {
|
||
|
|
state.pushChoiceContext(
|
||
|
|
node.operator.slice(0, -1), // removes `=` from the end
|
||
|
|
isForkingByTrueOrFalse(node)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ConditionalExpression":
|
||
|
|
case "IfStatement":
|
||
|
|
state.pushChoiceContext("test", false);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "SwitchStatement":
|
||
|
|
state.pushSwitchContext(
|
||
|
|
node.cases.some(isCaseNode),
|
||
|
|
getLabel(node)
|
||
|
|
);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "TryStatement":
|
||
|
|
state.pushTryContext(Boolean(node.finalizer));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "SwitchCase":
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Fork if this node is after the 2st node in `cases`.
|
||
|
|
* It's similar to `else` blocks.
|
||
|
|
* The next `test` node is processed in this path.
|
||
|
|
*/
|
||
|
|
if (parent.discriminant !== node && parent.cases[0] !== node) {
|
||
|
|
state.forkPath();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "WhileStatement":
|
||
|
|
case "DoWhileStatement":
|
||
|
|
case "ForStatement":
|
||
|
|
case "ForInStatement":
|
||
|
|
case "ForOfStatement":
|
||
|
|
state.pushLoopContext(node.type, getLabel(node));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "LabeledStatement":
|
||
|
|
if (!breakableTypePattern.test(node.body.type)) {
|
||
|
|
state.pushBreakContext(false, node.label.name);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Emits onCodePathSegmentStart events if updated.
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
debug.dumpState(node, state, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Updates the code path due to the type of a given node in leaving.
|
||
|
|
* @param {CodePathAnalyzer} analyzer The instance.
|
||
|
|
* @param {ASTNode} node The current AST node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function processCodePathToExit(analyzer, node) {
|
||
|
|
|
||
|
|
const codePath = analyzer.codePath;
|
||
|
|
const state = CodePath.getState(codePath);
|
||
|
|
let dontForward = false;
|
||
|
|
|
||
|
|
switch (node.type) {
|
||
|
|
case "ChainExpression":
|
||
|
|
state.popChainContext();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "IfStatement":
|
||
|
|
case "ConditionalExpression":
|
||
|
|
state.popChoiceContext();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "LogicalExpression":
|
||
|
|
if (isHandledLogicalOperator(node.operator)) {
|
||
|
|
state.popChoiceContext();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "AssignmentExpression":
|
||
|
|
if (isLogicalAssignmentOperator(node.operator)) {
|
||
|
|
state.popChoiceContext();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "SwitchStatement":
|
||
|
|
state.popSwitchContext();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "SwitchCase":
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is the same as the process at the 1st `consequent` node in
|
||
|
|
* `preprocess` function.
|
||
|
|
* Must do if this `consequent` is empty.
|
||
|
|
*/
|
||
|
|
if (node.consequent.length === 0) {
|
||
|
|
state.makeSwitchCaseBody(true, !node.test);
|
||
|
|
}
|
||
|
|
if (state.forkContext.reachable) {
|
||
|
|
dontForward = true;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "TryStatement":
|
||
|
|
state.popTryContext();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "BreakStatement":
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
state.makeBreak(node.label && node.label.name);
|
||
|
|
dontForward = true;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ContinueStatement":
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
state.makeContinue(node.label && node.label.name);
|
||
|
|
dontForward = true;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ReturnStatement":
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
state.makeReturn();
|
||
|
|
dontForward = true;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "ThrowStatement":
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
state.makeThrow();
|
||
|
|
dontForward = true;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "Identifier":
|
||
|
|
if (isIdentifierReference(node)) {
|
||
|
|
state.makeFirstThrowablePathInTryBlock();
|
||
|
|
dontForward = true;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "CallExpression":
|
||
|
|
case "ImportExpression":
|
||
|
|
case "MemberExpression":
|
||
|
|
case "NewExpression":
|
||
|
|
case "YieldExpression":
|
||
|
|
state.makeFirstThrowablePathInTryBlock();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "WhileStatement":
|
||
|
|
case "DoWhileStatement":
|
||
|
|
case "ForStatement":
|
||
|
|
case "ForInStatement":
|
||
|
|
case "ForOfStatement":
|
||
|
|
state.popLoopContext();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "AssignmentPattern":
|
||
|
|
state.popForkContext();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case "LabeledStatement":
|
||
|
|
if (!breakableTypePattern.test(node.body.type)) {
|
||
|
|
state.popBreakContext();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Emits onCodePathSegmentStart events if updated.
|
||
|
|
if (!dontForward) {
|
||
|
|
forwardCurrentToHead(analyzer, node);
|
||
|
|
}
|
||
|
|
debug.dumpState(node, state, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Updates the code path to finalize the current code path.
|
||
|
|
* @param {CodePathAnalyzer} analyzer The instance.
|
||
|
|
* @param {ASTNode} node The current AST node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function postprocess(analyzer, node) {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Ends the code path for the current node.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function endCodePath() {
|
||
|
|
let codePath = analyzer.codePath;
|
||
|
|
|
||
|
|
// Mark the current path as the final node.
|
||
|
|
CodePath.getState(codePath).makeFinal();
|
||
|
|
|
||
|
|
// Emits onCodePathSegmentEnd event of the current segments.
|
||
|
|
leaveFromCurrentSegment(analyzer, node);
|
||
|
|
|
||
|
|
// Emits onCodePathEnd event of this code path.
|
||
|
|
debug.dump(`onCodePathEnd ${codePath.id}`);
|
||
|
|
analyzer.emitter.emit("onCodePathEnd", codePath, node);
|
||
|
|
debug.dumpDot(codePath);
|
||
|
|
|
||
|
|
codePath = analyzer.codePath = analyzer.codePath.upper;
|
||
|
|
if (codePath) {
|
||
|
|
debug.dumpState(node, CodePath.getState(codePath), true);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (node.type) {
|
||
|
|
case "Program":
|
||
|
|
case "FunctionDeclaration":
|
||
|
|
case "FunctionExpression":
|
||
|
|
case "ArrowFunctionExpression":
|
||
|
|
case "StaticBlock": {
|
||
|
|
endCodePath();
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// The `arguments.length >= 1` case is in `preprocess` function.
|
||
|
|
case "CallExpression":
|
||
|
|
if (node.optional === true && node.arguments.length === 0) {
|
||
|
|
CodePath.getState(analyzer.codePath).makeOptionalRight();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Special case: The right side of class field initializer is considered
|
||
|
|
* to be its own function, so we need to end a code path in this
|
||
|
|
* case.
|
||
|
|
*
|
||
|
|
* We need to check after the other checks in order to close the
|
||
|
|
* code paths in the correct order for code like this:
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* class Foo {
|
||
|
|
* a = () => {}
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* In this case, The ArrowFunctionExpression code path is closed first
|
||
|
|
* and then we need to close the code path for the PropertyDefinition
|
||
|
|
* value.
|
||
|
|
*/
|
||
|
|
if (isPropertyDefinitionValue(node)) {
|
||
|
|
endCodePath();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Public Interface
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The class to analyze code paths.
|
||
|
|
* This class implements the EventGenerator interface.
|
||
|
|
*/
|
||
|
|
class CodePathAnalyzer {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {EventGenerator} eventGenerator An event generator to wrap.
|
||
|
|
*/
|
||
|
|
constructor(eventGenerator) {
|
||
|
|
this.original = eventGenerator;
|
||
|
|
this.emitter = eventGenerator.emitter;
|
||
|
|
this.codePath = null;
|
||
|
|
this.idGenerator = new IdGenerator("s");
|
||
|
|
this.currentNode = null;
|
||
|
|
this.onLooped = this.onLooped.bind(this);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Does the process to enter a given AST node.
|
||
|
|
* This updates state of analysis and calls `enterNode` of the wrapped.
|
||
|
|
* @param {ASTNode} node A node which is entering.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
enterNode(node) {
|
||
|
|
this.currentNode = node;
|
||
|
|
|
||
|
|
// Updates the code path due to node's position in its parent node.
|
||
|
|
if (node.parent) {
|
||
|
|
preprocess(this, node);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Updates the code path.
|
||
|
|
* And emits onCodePathStart/onCodePathSegmentStart events.
|
||
|
|
*/
|
||
|
|
processCodePathToEnter(this, node);
|
||
|
|
|
||
|
|
// Emits node events.
|
||
|
|
this.original.enterNode(node);
|
||
|
|
|
||
|
|
this.currentNode = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Does the process to leave a given AST node.
|
||
|
|
* This updates state of analysis and calls `leaveNode` of the wrapped.
|
||
|
|
* @param {ASTNode} node A node which is leaving.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
leaveNode(node) {
|
||
|
|
this.currentNode = node;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Updates the code path.
|
||
|
|
* And emits onCodePathStart/onCodePathSegmentStart events.
|
||
|
|
*/
|
||
|
|
processCodePathToExit(this, node);
|
||
|
|
|
||
|
|
// Emits node events.
|
||
|
|
this.original.leaveNode(node);
|
||
|
|
|
||
|
|
// Emits the last onCodePathStart/onCodePathSegmentStart events.
|
||
|
|
postprocess(this, node);
|
||
|
|
|
||
|
|
this.currentNode = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This is called on a code path looped.
|
||
|
|
* Then this raises a looped event.
|
||
|
|
* @param {CodePathSegment} fromSegment A segment of prev.
|
||
|
|
* @param {CodePathSegment} toSegment A segment of next.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
onLooped(fromSegment, toSegment) {
|
||
|
|
if (fromSegment.reachable && toSegment.reachable) {
|
||
|
|
debug.dump(`onCodePathSegmentLoop ${fromSegment.id} -> ${toSegment.id}`);
|
||
|
|
this.emitter.emit(
|
||
|
|
"onCodePathSegmentLoop",
|
||
|
|
fromSegment,
|
||
|
|
toSegment,
|
||
|
|
this.currentNode
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = CodePathAnalyzer;
|