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NewTypeInference.java
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NewTypeInference.java
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/*
* Copyright 2013 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;
import com.google.javascript.jscomp.CodingConvention.AssertionFunctionSpec;
import com.google.javascript.jscomp.CodingConvention.Bind;
import com.google.javascript.jscomp.CodingConvention.ObjectLiteralCast;
import com.google.javascript.jscomp.graph.DiGraph.DiGraphEdge;
import com.google.javascript.jscomp.graph.DiGraph.DiGraphNode;
import com.google.javascript.jscomp.newtypes.DeclaredFunctionType;
import com.google.javascript.jscomp.newtypes.FunctionType;
import com.google.javascript.jscomp.newtypes.FunctionTypeBuilder;
import com.google.javascript.jscomp.newtypes.JSType;
import com.google.javascript.jscomp.newtypes.JSTypes;
import com.google.javascript.jscomp.newtypes.MismatchInfo;
import com.google.javascript.jscomp.newtypes.NominalType;
import com.google.javascript.jscomp.newtypes.QualifiedName;
import com.google.javascript.jscomp.newtypes.ToStringContext;
import com.google.javascript.jscomp.newtypes.TypeEnv;
import com.google.javascript.jscomp.newtypes.UniqueNameGenerator;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import com.google.javascript.rhino.TypeI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
/**
* New type inference algorithm.
*
* Main differences from the old type checker:
* - Infers types for unannotated functions
* - Stricter with missing-property warnings
* - Stricter when checking the operands of primitive operators
* - Requires constants to be typed
* - Tries to warn about misplaced annotations, rather than silently ignore them
*
* @author blickly@google.com (Ben Lickly)
* @author dimvar@google.com (Dimitris Vardoulakis)
*
*/
final class NewTypeInference implements CompilerPass {
static final DiagnosticType MISTYPED_ASSIGN_RHS = DiagnosticType.warning(
"JSC_NTI_MISTYPED_ASSIGN_RHS",
"The right side in the assignment is not a subtype of the left side.\n"
+ "{0}");
static final DiagnosticType INVALID_OPERAND_TYPE = DiagnosticType.warning(
"JSC_NTI_INVALID_OPERAND_TYPE",
"Invalid type(s) for operator {0}.\n"
+ "{1}");
static final DiagnosticType RETURN_NONDECLARED_TYPE = DiagnosticType.warning(
"JSC_NTI_RETURN_NONDECLARED_TYPE",
"Returned type does not match declared return type.\n"
+ "{0}");
static final DiagnosticType INVALID_INFERRED_RETURN_TYPE =
DiagnosticType.warning(
"JSC_NTI_INVALID_INFERRED_RETURN_TYPE",
"Function called in context that expects incompatible type.\n"
+ "{0}");
static final DiagnosticType INVALID_DECLARED_RETURN_TYPE_OF_GENERATOR_FUNCTION =
DiagnosticType.warning(
"JSC_NTI_INVALID_DECLARED_RETURN_TYPE_OF_GENERATOR_FUNCTION",
"A generator function must return a (supertype of) Generator.\n"
+ "{0}.");
static final DiagnosticType INVALID_ARGUMENT_TYPE = DiagnosticType.warning(
"JSC_NTI_INVALID_ARGUMENT_TYPE",
"Invalid type for parameter {0} of function {1}.\n"
+ "{2}");
static final DiagnosticType TEMPLATE_ARGUMENT_MISMATCH = DiagnosticType.warning(
"JSC_NTI_TEMPLATE_ARGUMENT_MISMATCH",
"Invalid type for the first parameter of tag function {0}.\n"
+ "{1}");
static final DiagnosticType TEMPLATE_ARGUMENT_MISSING = DiagnosticType.warning(
"JSC_NTI_TEMPLATE_ARGUMENT_MISSING",
"A tag function must take at least one argument.\n");
static final DiagnosticType CROSS_SCOPE_GOTCHA = DiagnosticType.warning(
"JSC_NTI_CROSS_SCOPE_GOTCHA",
"Variable {0} typed inconsistently across scopes.\n" +
"In outer scope : {1}\n" +
"In inner scope : {2}\n");
static final DiagnosticType POSSIBLY_INEXISTENT_PROPERTY =
DiagnosticType.warning(
"JSC_NTI_POSSIBLY_INEXISTENT_PROPERTY",
"Property {0} may not be present on {1}.");
static final DiagnosticType PROPERTY_ACCESS_ON_NONOBJECT =
DiagnosticType.warning(
"JSC_NTI_PROPERTY_ACCESS_ON_NONOBJECT",
"Cannot access property {0} of non-object type {1}.");
static final DiagnosticType NOT_UNIQUE_INSTANTIATION =
DiagnosticType.warning(
"JSC_NTI_NOT_UNIQUE_INSTANTIATION",
"When instantiating a polymorphic function,"
+ " you can only specify one type for each type variable.\n"
+ " Found {0} types for type variable {1}: {2},\n"
+ " when instantiating type: {3}");
static final DiagnosticType INVALID_INDEX_TYPE =
DiagnosticType.warning(
"JSC_NTI_INVALID_INDEX_TYPE",
"Invalid type for index.\n"
+ "{0}");
static final DiagnosticType BOTTOM_INDEX_TYPE =
DiagnosticType.warning(
"JSC_NTI_BOTTOM_INDEX_TYPE",
"This IObject {0} cannot be accessed with a valid type.\n"
+ " Usually the result of a bad union type.\n");
static final DiagnosticType INVALID_OBJLIT_PROPERTY_TYPE =
DiagnosticType.warning(
"JSC_NTI_INVALID_OBJLIT_PROPERTY_TYPE",
"Invalid type for object-literal property.\n"
+ "{0}");
static final DiagnosticType FORIN_EXPECTS_OBJECT =
DiagnosticType.warning(
"JSC_NTI_FORIN_EXPECTS_OBJECT",
"For/in expects an object, found type {0}.");
static final DiagnosticType FORIN_EXPECTS_STRING_KEY =
DiagnosticType.warning(
"JSC_NTI_FORIN_EXPECTS_STRING_KEY",
"For/in creates string keys, but variable has declared type {1}.");
static final DiagnosticType FOROF_EXPECTS_ITERABLE =
DiagnosticType.warning(
"JSC_NTI_FOROF_EXPECTS_ITERABLE", "For/of expects an iterable, found type {0}.");
static final DiagnosticType MISTYPED_FOROF_ELEMENT_TYPE =
DiagnosticType.warning(
"JSC_NTI_MISTYPED_FOROF_ELEMENT_TYPE",
"Invalid type for for/of element.\n"
+ "{0}");
static final DiagnosticType CONST_REASSIGNED =
DiagnosticType.warning(
"JSC_NTI_CONST_REASSIGNED",
"Cannot change the value of a constant.");
static final DiagnosticType CONST_PROPERTY_REASSIGNED =
DiagnosticType.warning(
"JSC_NTI_CONST_PROPERTY_REASSIGNED",
"Cannot change the value of a constant property.");
static final DiagnosticType CONST_PROPERTY_DELETED =
DiagnosticType.warning(
"JSC_NTI_CONSTANT_PROPERTY_DELETED",
"Constant property {0} cannot be deleted");
static final DiagnosticType NOT_A_CONSTRUCTOR =
DiagnosticType.warning(
"JSC_NTI_NOT_A_CONSTRUCTOR",
"Expected a constructor but found type {0}.");
static final DiagnosticType CANNOT_INSTANTIATE_ABSTRACT_CLASS =
DiagnosticType.warning(
"JSC_NTI_CANNOT_INSTANTIATE_ABSTRACT_CLASS",
"Cannot instantiate abstract class {0}.");
static final DiagnosticType UNDEFINED_SUPER_CLASS =
DiagnosticType.warning(
"JSC_UNDEFINED_SUPER_CLASS",
"Undefined super class for {0}.");
static final DiagnosticType ASSERT_FALSE =
DiagnosticType.warning(
"JSC_NTI_ASSERT_FALSE",
"Assertion is always false. Please use a throw or fail() instead.");
static final DiagnosticType UNKNOWN_ASSERTION_TYPE =
DiagnosticType.warning(
"JSC_NTI_UNKNOWN_ASSERTION_TYPE",
"Assert with unknown asserted type.");
static final DiagnosticType INVALID_THIS_TYPE_IN_BIND =
DiagnosticType.warning(
"JSC_NTI_INVALID_THIS_TYPE_IN_BIND",
"Invalid type for the first argument to bind.\n"
+ "{0}");
static final DiagnosticType CANNOT_BIND_CTOR =
DiagnosticType.warning(
"JSC_NTI_CANNOT_BIND_CTOR",
"We do not support using .bind on constructor functions.");
static final DiagnosticType GOOG_BIND_EXPECTS_FUNCTION =
DiagnosticType.warning(
"JSC_NTI_GOOG_BIND_EXPECTS_FUNCTION",
"The first argument to goog.bind/goog.partial must be a function,"
+ " found: {0}");
static final DiagnosticType BOTTOM_PROP =
DiagnosticType.warning(
"JSC_NTI_BOTTOM_PROP",
"Property {0} of {1} cannot have a valid type."
+ "Maybe the result of a union of incompatible types?");
static final DiagnosticType INVALID_CAST =
DiagnosticType.warning("JSC_NTI_INVALID_CAST",
"invalid cast - the types do not have a common subtype\n" +
"from: {0}\n" +
"to : {1}");
static final DiagnosticType GLOBAL_THIS = DiagnosticType.warning(
"JSC_NTI_USED_GLOBAL_THIS",
"Dangerous use of the global THIS object");
static final DiagnosticType MISSING_RETURN_STATEMENT =
DiagnosticType.warning(
"JSC_NTI_MISSING_RETURN_STATEMENT",
"Missing return statement. Function expected to return {0}.");
static final DiagnosticType CONSTRUCTOR_NOT_CALLABLE =
DiagnosticType.warning(
"JSC_NTI_CONSTRUCTOR_NOT_CALLABLE",
"Constructor {0} should be called with the \"new\" keyword");
static final DiagnosticType ILLEGAL_OBJLIT_KEY =
DiagnosticType.warning(
"JSC_NTI_ILLEGAL_OBJLIT_KEY",
"Illegal key, the object literal is a {0}");
static final DiagnosticType ILLEGAL_PROPERTY_CREATION =
DiagnosticType.warning(
"JSC_NTI_ILLEGAL_PROPERTY_CREATION",
"Cannot add property {0} to a struct instance after it is constructed.");
static final DiagnosticType IN_USED_WITH_STRUCT =
DiagnosticType.warning(
"JSC_NTI_IN_USED_WITH_STRUCT",
"Cannot use the IN operator with structs");
static final DiagnosticType ADDING_PROPERTY_TO_NON_OBJECT =
DiagnosticType.warning(
"JSC_NTI_ADDING_PROPERTY_TO_NON_OBJECT",
"Cannot create property {0} on non-object type {1}.");
public static final DiagnosticType INEXISTENT_PROPERTY =
DiagnosticType.warning(
"JSC_NTI_INEXISTENT_PROPERTY",
"Property {0} never defined on {1}");
static final DiagnosticType NOT_CALLABLE =
DiagnosticType.warning(
"JSC_NTI_NOT_FUNCTION_TYPE",
"Cannot call non-function type {0}");
static final DiagnosticType WRONG_ARGUMENT_COUNT =
DiagnosticType.warning(
"JSC_NTI_WRONG_ARGUMENT_COUNT",
"Function {0}: called with {1} argument(s). " +
"Function requires at least {2} argument(s){3}.");
static final DiagnosticType ILLEGAL_PROPERTY_ACCESS =
DiagnosticType.warning(
"JSC_NTI_ILLEGAL_PROPERTY_ACCESS",
"Cannot do {0} access on a {1}");
static final DiagnosticType UNKNOWN_TYPEOF_VALUE =
DiagnosticType.warning(
"JSC_NTI_UNKNOWN_TYPEOF_VALUE",
"unknown type: {0}");
static final DiagnosticType UNKNOWN_NAMESPACE_PROPERTY =
DiagnosticType.warning(
"JSC_NTI_UNKNOWN_NAMESPACE_PROPERTY",
"Cannot determine the type of namespace property {0}. "
+ "Maybe a prefix of the property name has been redefined?");
static final DiagnosticType INCOMPATIBLE_STRICT_COMPARISON =
DiagnosticType.warning(
"JSC_INCOMPATIBLE_STRICT_COMPARISON",
"Cannot perform strict equality / inequality comparisons on incompatible types:\n"
+ "left : {0}\n"
+ "right: {1}");
static final DiagnosticType ABSTRACT_SUPER_METHOD_NOT_CALLABLE =
DiagnosticType.warning(
"JSC_NTI_ABSTRACT_SUPER_METHOD_NOT_CALLABLE",
"Abstract super method {0} cannot be called");
static final DiagnosticType REFLECT_CONSTRUCTOR_EXPECTED =
DiagnosticType.warning(
"JSC_NTI_REFLECT_CONSTRUCTOR_EXPECTED",
"Constructor expected as first argument");
// Not part of ALL_DIAGNOSTICS because it should not be enabled with
// --jscomp_error=newCheckTypes. It should only be enabled explicitly.
static final DiagnosticType NULLABLE_DEREFERENCE =
DiagnosticType.disabled(
"JSC_NTI_NULLABLE_DEREFERENCE",
"Attempt to use nullable type {0}.");
static final DiagnosticType UNKNOWN_EXPR_TYPE =
DiagnosticType.disabled(
"JSC_NTI_UNKNOWN_EXPR_TYPE",
"This {0} expression has the unknown type.");
static final DiagnosticType YIELD_NONDECLARED_TYPE = DiagnosticType.warning(
"JSC_NTI_YIELD_NONDECLARED_TYPE",
"Yielded type does not match declared return type.\n"
+ "{0}");
static final DiagnosticType YIELD_ALL_EXPECTS_ITERABLE = DiagnosticType.warning(
"JSC_NTI_YIELD_ALL_EXPECTS_ITERABLE",
"Expression yield* expects an iterable, found type {0}.");
static final DiagnosticType CANNOT_USE_UNRESOLVED_TYPE = DiagnosticType.warning(
"JSC_CANNOT_USE_UNRESOLVED_TYPE",
"Cannot use unresolved type {0}. Please include the type definition in your application.");
static final DiagnosticGroup COMPATIBLE_DIAGNOSTICS = new DiagnosticGroup(
ABSTRACT_SUPER_METHOD_NOT_CALLABLE,
CANNOT_BIND_CTOR,
CANNOT_INSTANTIATE_ABSTRACT_CLASS,
CONST_PROPERTY_DELETED,
CONST_PROPERTY_REASSIGNED,
CONST_REASSIGNED,
REFLECT_CONSTRUCTOR_EXPECTED,
CONSTRUCTOR_NOT_CALLABLE,
FORIN_EXPECTS_STRING_KEY,
FOROF_EXPECTS_ITERABLE,
MISTYPED_FOROF_ELEMENT_TYPE,
GLOBAL_THIS,
GOOG_BIND_EXPECTS_FUNCTION,
ILLEGAL_OBJLIT_KEY,
ILLEGAL_PROPERTY_ACCESS,
ILLEGAL_PROPERTY_CREATION,
IN_USED_WITH_STRUCT,
INEXISTENT_PROPERTY,
INVALID_ARGUMENT_TYPE,
TEMPLATE_ARGUMENT_MISMATCH,
TEMPLATE_ARGUMENT_MISSING,
INVALID_CAST,
INVALID_INDEX_TYPE,
INVALID_OBJLIT_PROPERTY_TYPE,
MISSING_RETURN_STATEMENT,
MISTYPED_ASSIGN_RHS,
NOT_A_CONSTRUCTOR,
NOT_CALLABLE,
POSSIBLY_INEXISTENT_PROPERTY,
RETURN_NONDECLARED_TYPE,
UNKNOWN_ASSERTION_TYPE,
UNKNOWN_TYPEOF_VALUE,
WRONG_ARGUMENT_COUNT,
YIELD_ALL_EXPECTS_ITERABLE,
INVALID_DECLARED_RETURN_TYPE_OF_GENERATOR_FUNCTION);
// TODO(dimvar): Check for which of these warnings it makes sense to keep
// going after warning, e.g., for NOT_UNIQUE_INSTANTIATION, we must instantiate
// to the join of the types.
static final DiagnosticGroup NEW_DIAGNOSTICS =
new DiagnosticGroup(
ADDING_PROPERTY_TO_NON_OBJECT,
ASSERT_FALSE,
BOTTOM_INDEX_TYPE,
BOTTOM_PROP,
CANNOT_USE_UNRESOLVED_TYPE,
CROSS_SCOPE_GOTCHA,
FORIN_EXPECTS_OBJECT,
INCOMPATIBLE_STRICT_COMPARISON,
INVALID_INFERRED_RETURN_TYPE,
INVALID_OPERAND_TYPE,
INVALID_THIS_TYPE_IN_BIND,
NOT_UNIQUE_INSTANTIATION,
PROPERTY_ACCESS_ON_NONOBJECT,
UNKNOWN_NAMESPACE_PROPERTY,
YIELD_NONDECLARED_TYPE);
public static class WarningReporter {
AbstractCompiler compiler;
WarningReporter(AbstractCompiler compiler) { this.compiler = compiler; }
void add(JSError warning) {
String filename = warning.node.getSourceFileName();
// Avoid some warnings in code generated by the ES6 transpilation.
// TODO(dimvar): typecheck that code properly and remove this.
if ((filename != null && filename.startsWith(" [synthetic")) || JSType.mockToString) {
return;
}
compiler.report(warning);
}
}
private final WarningReporter warnings;
private List<TypeMismatch> mismatches;
private List<TypeMismatch> implicitInterfaceUses;
private final AbstractCompiler compiler;
private final CodingConvention convention;
private TypeTransformation ttlObj;
private final Map<DiGraphEdge<Node, ControlFlowGraph.Branch>, TypeEnv> envs;
private final Map<NTIScope, JSType> summaries;
private final Map<Node, DeferredCheck> deferredChecks;
private ControlFlowGraph<Node> cfg;
private NTIScope currentScope;
// This TypeEnv should be computed once per scope
private TypeEnv typeEnvFromDeclaredTypes = null;
// Throws are not connected to the implicit return of the CFG. Record type environments here
// to use when computing the summary of a function.
private List<TypeEnv> exitEnvs = null;
private GlobalTypeInfo symbolTable;
private JSTypes commonTypes;
// RETVAL_ID is used when we calculate the summary type of a function
private static final String RETVAL_ID = "%return";
// YIELDVAL_ID is used when we calculate the summary type of a generator function
private static final String YIELDVAL_ID = "%yield";
private static final String THIS_ID = "this";
@SuppressWarnings("ConstantField")
private final String ABSTRACT_METHOD_NAME;
private final Map<String, AssertionFunctionSpec> assertionFunctionsMap;
// To avoid creating warning objects for disabled warnings
private final boolean reportUnknownTypes;
private final boolean reportNullDeref;
// Fields used in the compatibility mode
private final boolean joinTypesWhenInstantiatingGenerics;
private final boolean allowPropertyOnSubtypes;
private final boolean areTypeVariablesUnknown;
// Used in per-library type checking
private final boolean warnForUnresolvedTypes;
// Used only for development
private static final boolean showDebuggingPrints = false;
static boolean measureMem = false;
private static long peakMem = 0;
// Used to avoid typing this.commonTypes.TYPENAME everywhere.
@SuppressWarnings("ConstantField")
private JSType BOOLEAN;
@SuppressWarnings("ConstantField")
private JSType BOTTOM;
@SuppressWarnings("ConstantField")
private JSType FALSE_TYPE;
@SuppressWarnings("ConstantField")
private JSType FALSY;
@SuppressWarnings("ConstantField")
private JSType NULL;
@SuppressWarnings("ConstantField")
private JSType NULL_OR_UNDEFINED;
@SuppressWarnings("ConstantField")
private JSType NUMBER;
@SuppressWarnings("ConstantField")
private JSType NUMBER_OR_STRING;
@SuppressWarnings("ConstantField")
private JSType STRING;
@SuppressWarnings("ConstantField")
private JSType TOP_OBJECT;
@SuppressWarnings("ConstantField")
private JSType TRUE_TYPE;
@SuppressWarnings("ConstantField")
private JSType TRUTHY;
@SuppressWarnings("ConstantField")
private JSType UNDEFINED;
@SuppressWarnings("ConstantField")
private JSType UNKNOWN;
NewTypeInference(AbstractCompiler compiler) {
this.warnings = new WarningReporter(compiler);
this.compiler = compiler;
this.convention = compiler.getCodingConvention();
this.envs = new LinkedHashMap<>();
this.summaries = new LinkedHashMap<>();
this.deferredChecks = new LinkedHashMap<>();
this.ABSTRACT_METHOD_NAME = convention.getAbstractMethodName();
this.reportUnknownTypes =
compiler.getOptions().enables(DiagnosticGroups.REPORT_UNKNOWN_TYPES);
this.reportNullDeref = compiler.getOptions()
.enables(DiagnosticGroups.NEW_CHECK_TYPES_ALL_CHECKS);
assertionFunctionsMap = new LinkedHashMap<>();
for (AssertionFunctionSpec assertionFunction : convention.getAssertionFunctions()) {
assertionFunctionsMap.put(
assertionFunction.getFunctionName(),
assertionFunction);
}
boolean inCompatibilityMode =
compiler.getOptions().disables(DiagnosticGroups.NEW_CHECK_TYPES_EXTRA_CHECKS);
this.joinTypesWhenInstantiatingGenerics = inCompatibilityMode;
this.allowPropertyOnSubtypes = inCompatibilityMode;
this.areTypeVariablesUnknown = inCompatibilityMode;
this.warnForUnresolvedTypes = compiler.getOptions().inIncrementalCheckMode();
}
@VisibleForTesting // Only used from tests
public NTIScope processForTesting(Node externs, Node root) {
process(externs, root);
return symbolTable.getGlobalScope();
}
@Override
public void process(Node externs, Node root) {
try {
this.symbolTable = (GlobalTypeInfo) compiler.getGlobalTypeInfo();
this.commonTypes = this.symbolTable.getCommonTypes();
this.ttlObj = new TypeTransformation(compiler, this.symbolTable.getGlobalScope());
this.mismatches = symbolTable.getMismatches();
this.implicitInterfaceUses = symbolTable.getImplicitInterfaceUses();
this.BOOLEAN = this.commonTypes.BOOLEAN;
this.BOTTOM = this.commonTypes.BOTTOM;
this.FALSE_TYPE = this.commonTypes.FALSE_TYPE;
this.FALSY = this.commonTypes.FALSY;
this.NULL = this.commonTypes.NULL;
this.NULL_OR_UNDEFINED = this.commonTypes.NULL_OR_UNDEFINED;
this.NUMBER = this.commonTypes.NUMBER;
this.NUMBER_OR_STRING = this.commonTypes.NUMBER_OR_STRING;
this.STRING = this.commonTypes.STRING;
this.TOP_OBJECT = this.commonTypes.getTopObject();
this.TRUE_TYPE = this.commonTypes.TRUE_TYPE;
this.TRUTHY = this.commonTypes.TRUTHY;
this.UNDEFINED = this.commonTypes.UNDEFINED;
this.UNKNOWN = this.commonTypes.UNKNOWN;
for (NTIScope scope : symbolTable.getScopes()) {
analyzeFunction(scope);
envs.clear();
}
for (DeferredCheck check : deferredChecks.values()) {
check.runCheck(summaries, warnings);
}
if (measureMem) {
System.out.println("Peak mem: " + peakMem + "MB");
}
} catch (Exception unexpectedException) {
String message = unexpectedException.getMessage();
if (currentScope != null) {
message += "\nIn scope: " + currentScope;
}
this.compiler.throwInternalError(message, unexpectedException);
}
}
static void updatePeakMem() {
Runtime rt = Runtime.getRuntime();
long currentUsedMem = (rt.totalMemory() - rt.freeMemory()) / (1024 * 1024);
if (currentUsedMem > peakMem) {
peakMem = currentUsedMem;
}
}
private static void println(Object ... objs) {
if (showDebuggingPrints) {
StringBuilder b = new StringBuilder();
for (Object obj : objs) {
b.append(obj);
}
System.out.println(b);
}
}
private void registerMismatchAndWarn(JSError error, JSType found, JSType required) {
TypeMismatch.registerMismatch(
this.mismatches, this.implicitInterfaceUses, found, required, error);
warnings.add(error);
}
private void registerImplicitUses(Node src, JSType from, JSType to) {
TypeMismatch.recordImplicitInterfaceUses(this.implicitInterfaceUses, src, from, to);
// Match the OTI behavior that trusts casts from Object, to avoid disambiguation regressions.
// TODO(dimvar): useful for the bodies of assertion functions, but unsafe. Make stricter?
if (!src.isCast()) {
TypeMismatch.recordImplicitUseOfNativeObject(this.mismatches, src, from, to);
}
}
private TypeEnv getInEnv(DiGraphNode<Node, ControlFlowGraph.Branch> dn) {
List<DiGraphEdge<Node, ControlFlowGraph.Branch>> inEdges = dn.getInEdges();
// True for code considered dead in the CFG
if (inEdges.isEmpty()) {
return getEntryTypeEnv();
}
if (inEdges.size() == 1) {
return envs.get(inEdges.get(0));
}
Set<TypeEnv> envSet = new LinkedHashSet<>();
for (DiGraphEdge<Node, ControlFlowGraph.Branch> de : inEdges) {
TypeEnv env = envs.get(de);
if (env != null) {
envSet.add(env);
}
}
if (envSet.isEmpty()) {
return null;
}
return TypeEnv.join(envSet);
}
private TypeEnv getOutEnv(DiGraphNode<Node, ControlFlowGraph.Branch> dn) {
List<DiGraphEdge<Node, ControlFlowGraph.Branch>> outEdges = dn.getOutEdges();
if (outEdges.isEmpty()) {
// This occurs when visiting a throw in the backward direction.
checkArgument(dn.getValue().isThrow());
return this.typeEnvFromDeclaredTypes;
}
if (outEdges.size() == 1) {
return envs.get(outEdges.get(0));
}
Set<TypeEnv> envSet = new LinkedHashSet<>();
for (DiGraphEdge<Node, ControlFlowGraph.Branch> de : outEdges) {
TypeEnv env = envs.get(de);
if (env != null) {
envSet.add(env);
}
}
checkState(!envSet.isEmpty());
return TypeEnv.join(envSet);
}
private TypeEnv setOutEnv(
DiGraphNode<Node, ControlFlowGraph.Branch> dn, TypeEnv e) {
for (DiGraphEdge<Node, ControlFlowGraph.Branch> de : dn.getOutEdges()) {
envs.put(de, e);
}
return e;
}
// Initialize the type environments on the CFG edges before the FWD analysis.
private void initEdgeEnvsFwd(TypeEnv entryEnv) {
envs.clear();
// For function scopes, add the formal parameters and the free variables
// from outer scopes to the environment.
Set<String> nonLocals = new LinkedHashSet<>();
if (this.currentScope.hasThis()) {
nonLocals.add(THIS_ID);
}
if (this.currentScope.isFunction()) {
if (this.currentScope.getName() != null) {
nonLocals.add(this.currentScope.getName());
}
nonLocals.addAll(this.currentScope.getOuterVars());
nonLocals.addAll(this.currentScope.getFormals());
entryEnv = envPutType(entryEnv, RETVAL_ID, UNDEFINED);
} else {
nonLocals.addAll(this.currentScope.getExterns());
}
for (String name : nonLocals) {
JSType declType = this.currentScope.getDeclaredTypeOf(name);
JSType initType = declType;
if (initType == null) {
initType = envGetType(entryEnv, name);
} else if (this.areTypeVariablesUnknown) {
initType = initType.substituteGenericsWithUnknown();
}
println("Adding non-local ", name,
" with decltype: ", declType,
" and inittype: ", initType);
entryEnv = envPutType(entryEnv, name, initType);
}
// For all scopes, add local variables and (local) function definitions
// to the environment.
for (String local : this.currentScope.getLocals()) {
if (!this.currentScope.isFunctionNamespace(local)) {
entryEnv = envPutType(entryEnv, local, UNDEFINED);
}
}
for (String fnName : this.currentScope.getLocalFunDefs()) {
entryEnv = envPutType(entryEnv, fnName, getSummaryOfLocalFunDef(fnName));
}
println("Keeping env: ", entryEnv);
setOutEnv(this.cfg.getEntry(), entryEnv);
}
private TypeEnv getTypeEnvFromDeclaredTypes() {
TypeEnv env = new TypeEnv();
Set<String> varNames = this.currentScope.getOuterVars();
Set<String> locals = this.currentScope.getLocals();
varNames.addAll(locals);
varNames.addAll(this.currentScope.getExterns());
if (this.currentScope.hasThis()) {
varNames.add(THIS_ID);
}
if (this.currentScope.isFunction()) {
Node fn = this.currentScope.getRoot();
if (!this.currentScope.hasThis()
// Can't use NodeUtil.referencesSuper here because that function is correct only
// on valid ASTs, but here we may have an invalid AST that contains super inside
// a function.
&& NodeUtil.containsType(fn.getLastChild(), Token.SUPER, NodeUtil.MATCH_NOT_FUNCTION)) {
// This function is a static method on some class. To do lookups of the
// class name, we add the root of the qualified name to the environment.
Node funNameNode = NodeUtil.getBestLValue(fn);
Node qnameRoot = NodeUtil.getRootOfQualifiedName(funNameNode);
checkState(qnameRoot.isName());
varNames.add(qnameRoot.getString());
}
if (this.currentScope.getName() != null) {
varNames.add(this.currentScope.getName());
}
varNames.addAll(this.currentScope.getFormals());
// In the rare case when there is a local variable named "arguments",
// this entry will be overwritten in the foreach loop below.
JSType argumentsType;
DeclaredFunctionType dft = this.currentScope.getDeclaredTypeForOwnBody();
if (dft.getOptionalArity() == 0 && dft.hasRestFormals()) {
argumentsType = dft.getRestFormalsType();
} else {
argumentsType = UNKNOWN;
}
env = envPutType(env, "arguments",
commonTypes.getArgumentsArrayType(argumentsType));
}
for (String varName : varNames) {
if (!this.currentScope.isLocalFunDef(varName)) {
JSType declType = this.currentScope.getDeclaredTypeOf(varName);
if (declType == null) {
declType = UNKNOWN;
} else if (areTypeVariablesUnknown) {
declType = declType.substituteGenericsWithUnknown();
}
env = envPutType(env, varName, declType);
}
}
for (String fnName : this.currentScope.getLocalFunDefs()) {
env = envPutType(env, fnName, getSummaryOfLocalFunDef(fnName));
}
return env;
}
private JSType getSummaryOfLocalFunDef(String name) {
NTIScope fnScope = this.currentScope.getScope(name);
JSType fnType = summaries.get(fnScope);
if (fnType != null) {
return fnType;
}
// Functions defined in externs have no summary, so use the declared type
fnType = this.currentScope.getDeclaredTypeOf(name);
if (fnType.getFunType() == null) {
// Can happen when a function defined in externs clashes with a variable
// defined by a catch block.
// TODO(dimvar): once we fix scoping for catch blocks, uncomment the
// precondition below.
checkState(fnType.isUnknown());
return this.commonTypes.qmarkFunction();
// Preconditions.checkState(fnType.getFunType() != null,
// "Needed function but found %s", fnType);
}
return changeTypeIfFunctionNamespace(fnScope, fnType);
}
private void analyzeFunction(NTIScope scope) {
println("=== Analyzing function: ", scope.getReadableName(), " ===");
currentScope = scope;
exitEnvs = new ArrayList<>();
ControlFlowAnalysis cfa = new ControlFlowAnalysis(compiler, false, false);
cfa.process(null, scope.getRoot());
this.cfg = cfa.getCfg();
println(this.cfg);
// The size is > 1 when multiple files are compiled
// Preconditions.checkState(cfg.getEntry().getOutEdges().size() == 1);
NTIWorkset workset = NTIWorkset.create(this.cfg);
this.typeEnvFromDeclaredTypes = getTypeEnvFromDeclaredTypes();
if (scope.isFunction() && scope.hasUndeclaredFormalsOrOuters()) {
// Ideally, we would like to only set the in-edges of the implicit return
// rather than all edges. However, we cannot do that because of a bug in
// workset construction. (The test testBadWorksetConstruction would fail.)
// In buildWorksetHelper, if a loop contains break, we add the FOLLOW node
// of the loop before adding the loop header twice. So, the 2nd addition
// of the loop header has no effect. We should fix workset creation
// (eg, by putting edges instead of nodes in seen, or some other way that
// correctly waits for all incoming edges).
for (DiGraphEdge<Node, ControlFlowGraph.Branch> e : this.cfg.getEdges()) {
envs.put(e, this.typeEnvFromDeclaredTypes);
}
analyzeFunctionBwd(workset);
// TODO(dimvar): Revisit what we throw away after the bwd analysis
TypeEnv entryEnv = getEntryTypeEnv();
// Start undeclared outer variables at their inferred type if it exists.
// Gives better results than starting them at unknown.
for (String varName : scope.getOuterVars()) {
JSType inferred = scope.getInferredTypeOf(varName);
if (inferred != null) {
entryEnv = envPutType(entryEnv, varName, inferred);
}
}
initEdgeEnvsFwd(entryEnv);
if (measureMem) {
updatePeakMem();
}
} else {
TypeEnv entryEnv = this.typeEnvFromDeclaredTypes;
initEdgeEnvsFwd(entryEnv);
}
this.typeEnvFromDeclaredTypes = null;
analyzeFunctionFwd(workset);
if (scope.isFunction()) {
createSummary(scope);
}
if (measureMem) {
updatePeakMem();
}
}
private void analyzeFunctionBwd(NTIWorkset workset) {
for (DiGraphNode<Node, ControlFlowGraph.Branch> dn : workset.backward()) {
Node n = dn.getValue();
TypeEnv outEnv = checkNotNull(getOutEnv(dn));
TypeEnv inEnv;
println("\tBWD Statment: ", n);
println("\t\toutEnv: ", outEnv);
switch (n.getToken()) {
case EXPR_RESULT:
inEnv = analyzeExprBwd(n.getFirstChild(), outEnv, UNKNOWN).env;
break;
case RETURN: {
Node retExp = n.getFirstChild();
if (retExp == null) {
inEnv = outEnv;
} else {
JSType declRetType = this.currentScope.getDeclaredTypeForOwnBody().getReturnType();
declRetType = firstNonNull(declRetType, UNKNOWN);
inEnv = analyzeExprBwd(retExp, outEnv, declRetType).env;
}
break;
}
case VAR: {
if (NodeUtil.isTypedefDecl(n)) {
inEnv = outEnv;
break;
}
inEnv = outEnv;
for (Node nameNode = n.getFirstChild(); nameNode != null;
nameNode = nameNode.getNext()) {
String varName = nameNode.getString();
Node rhs = nameNode.getFirstChild();
JSType declType = this.currentScope.getDeclaredTypeOf(varName);
inEnv = envPutType(inEnv, varName, UNKNOWN);
if (rhs == null || this.currentScope.isLocalFunDef(varName)) {
continue;
}
JSType inferredType = envGetType(outEnv, varName);
JSType requiredType;
if (declType == null) {
requiredType = inferredType;
} else {
// TODO(dimvar): look if the meet is needed
requiredType = JSType.meet(declType, inferredType);
requiredType = firstNonBottom(requiredType, UNKNOWN);
}
inEnv = analyzeExprBwd(rhs, inEnv, requiredType).env;
}
break;
}
case BLOCK:
case ROOT:
case BREAK:
case CATCH:
case CONTINUE:
case DEFAULT_CASE:
case DEBUGGER:
case EMPTY:
case SCRIPT:
case TRY:
case WITH:
inEnv = outEnv;
break;
case DO:
case FOR:
case FOR_IN:
case FOR_OF:
case IF:
case WHILE:
Node expr =
(n.isForIn() || n.isForOf()) ? n.getFirstChild() : NodeUtil.getConditionExpression(n);
inEnv = analyzeExprBwd(expr, outEnv).env;
break;
case THROW:
case CASE:
case SWITCH:
inEnv = analyzeExprBwd(n.getFirstChild(), outEnv).env;
break;
default:
if (NodeUtil.isStatement(n)) {
throw new RuntimeException("Unhandled statement type: " + n.getToken());
} else {
inEnv = analyzeExprBwd(n, outEnv).env;
break;
}
}
println("\t\tinEnv: ", inEnv);
for (DiGraphEdge<Node, ControlFlowGraph.Branch> de : dn.getInEdges()) {
envs.put(de, inEnv);
}
}
}
private void analyzeFunctionFwd(NTIWorkset workset) {
for (DiGraphNode<Node, ControlFlowGraph.Branch> dn : workset.forward()) {
Node n = dn.getValue();
Node parent = n.getParent();
checkState(n != null, "Implicit return should not be in workset.");
TypeEnv inEnv = getInEnv(dn);
TypeEnv outEnv = null;
if (parent.isScript()
|| (parent.isNormalBlock() && parent.getParent().isFunction())) {
// All joins have merged; forget changes
inEnv = inEnv.clearChangeLog();
}
println("\tFWD Statment: ", n);
println("\t\tinEnv: ", inEnv);
boolean conditional = false;
switch (n.getToken()) {
case BLOCK:
case ROOT:
case BREAK:
case CONTINUE:
case DEFAULT_CASE:
case DEBUGGER:
case EMPTY:
case FUNCTION:
case SCRIPT:
case TRY:
case WITH: // We don't typecheck WITH, we just avoid crashing.
outEnv = inEnv;
break;
case CATCH:
Node catchVar = n.getFirstChild();
String catchVarname = catchVar.getString();
outEnv = envPutType(inEnv, catchVarname, UNKNOWN);
maybeSetTypeI(catchVar, UNKNOWN);
break;
case EXPR_RESULT:
println("\tsemi ", n.getFirstChild().getToken());
if (n.getBooleanProp(Node.ANALYZED_DURING_GTI)) {
n.removeProp(Node.ANALYZED_DURING_GTI);
outEnv = inEnv;
} else {
outEnv = analyzeExprFwd(n.getFirstChild(), inEnv, UNKNOWN).env;
}
break;
case RETURN:
outEnv = analyzeReturnFwd(n, inEnv);
break;
case DO:
case IF:
case FOR:
case WHILE:
conditional = true;
analyzeConditionalStmFwd(dn, NodeUtil.getConditionExpression(n), inEnv);
break;
case FOR_IN:
outEnv = analyzeForInFwd(n, inEnv);
break;
case FOR_OF:
outEnv = analyzeForOfFwd(n, inEnv);
break;
case CASE: {
conditional = true;
// See analyzeExprFwd#Token.CASE for how to handle this precisely
analyzeConditionalStmFwd(dn, n, inEnv);
break;