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Fix some issues in SymbolResolver

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This commit is contained in:
Sam Vervaeck 2020-05-27 09:11:03 +02:00
parent 672cc62778
commit ad525ec712
3 changed files with 118 additions and 90 deletions
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3
src/checks.ts
View file

@ -75,7 +75,8 @@ export class CheckReferences extends NodeVisitor {
protected visitBoltReferenceTypeExpression(node: BoltReferenceTypeExpression) {
const scope = this.resolver.getScopeForNode(node, ScopeType.Type);
assert(scope !== null);
const resolvedSym = this.resolver.resolveSymbolPath(getSymbolPathFromNode(node.path), scope!);
const symbolPath = getSymbolPathFromNode(node.path);
const resolvedSym = this.resolver.resolveSymbolPath(symbolPath, scope!);
if (resolvedSym === null) {
this.diagnostics.add({
message: E_TYPE_DECLARATION_NOT_FOUND,

2
src/common.ts
View file

@ -226,7 +226,7 @@ export function isExported(node: Syntax) {
case SyntaxKind.BoltImplDeclaration:
return (node.modifiers & BoltModifiers.IsPublic) > 0;
default:
throw new Error(`The node ${kindToString(node.kind)} can not be exported.`)
return false;
}
}

183
src/resolver.ts
View file

@ -41,7 +41,7 @@ export function getSymbolPathFromNode(node: BoltSyntax): SymbolPath {
if (node.modulePath === null) {
return new SymbolPath([], false, name);
}
return new SymbolPath(node.modulePath.map(id => id.text), false, name);
return new SymbolPath(node.modulePath.elements.map(id => id.text), false, name);
case SyntaxKind.BoltModulePath:
return new SymbolPath(
node.elements.slice(0, -1).map(el => el.text),
@ -105,7 +105,7 @@ class NodeScopeSource implements ScopeSource {
interface ResolutionStrategy {
getSymbolName(node: Syntax): string;
getScopeType(node: Syntax): ScopeType;
getNextScopeSources(source: ScopeSource, kind: ScopeType): IterableIterator<ScopeSource>;
getNextScopeSource(source: ScopeSource, kind: ScopeType): ScopeSource | null;
}
export class BoltSymbolResolutionStrategy implements ResolutionStrategy {
@ -117,9 +117,9 @@ export class BoltSymbolResolutionStrategy implements ResolutionStrategy {
case SyntaxKind.BoltFunctionDeclaration:
case SyntaxKind.BoltTypeAliasDeclaration:
case SyntaxKind.BoltRecordDeclaration:
case SyntaxKind.BoltBindPattern:
case SyntaxKind.BoltTraitDeclaration:
case SyntaxKind.BoltImplDeclaration:
case SyntaxKind.BoltTypeParameter:
return true;
default:
return false;
@ -128,6 +128,8 @@ export class BoltSymbolResolutionStrategy implements ResolutionStrategy {
public getSymbolName(node: Syntax): string {
switch (node.kind) {
case SyntaxKind.BoltTypeParameter:
return node.name.text;
case SyntaxKind.BoltModule:
return node.name[node.name.length-1].text;
case SyntaxKind.BoltBindPattern:
@ -149,51 +151,63 @@ export class BoltSymbolResolutionStrategy implements ResolutionStrategy {
}
}
public getScopeType(node: Syntax): ScopeType {
public getScopeTypes(node: Syntax): ScopeType[] {
switch (node.kind) {
case SyntaxKind.BoltVariableDeclaration:
case SyntaxKind.BoltBindPattern:
return [ ScopeType.Variable ];
case SyntaxKind.BoltFunctionDeclaration:
return ScopeType.Variable;
case SyntaxKind.BoltImplDeclaration:
return [ ScopeType.Type, ScopeType.Variable ];
case SyntaxKind.BoltTraitDeclaration:
case SyntaxKind.BoltTypeAliasDeclaration:
case SyntaxKind.BoltRecordDeclaration:
return ScopeType.Type;
return [ ScopeType.Type, ScopeType.Module ];
case SyntaxKind.BoltFunctionDeclaration:
case SyntaxKind.BoltImplDeclaration:
case SyntaxKind.BoltTypeAliasDeclaration:
case SyntaxKind.BoltTypeParameter:
return [ ScopeType.Type ];
case SyntaxKind.BoltModule:
return ScopeType.Module;
return [ ScopeType.Module ];
default:
throw new Error(`Could not derive scope type of node ${kindToString(node.kind)}.`)
}
}
public introducesNewScope(node: Syntax, kind: ScopeType): boolean {
public introducesNewScope(source: ScopeSource, kind: ScopeType): boolean {
if (source instanceof PackageScopeSource || source instanceof GlobalScopeSource) {
return true;
}
if (source instanceof NodeScopeSource) {
switch (kind) {
case ScopeType.Variable:
return node.kind === SyntaxKind.BoltSourceFile
|| node.kind === SyntaxKind.BoltModule
|| node.kind === SyntaxKind.BoltFunctionDeclaration
|| node.kind === SyntaxKind.BoltBlockExpression;
return source.node.kind === SyntaxKind.BoltSourceFile
|| source.node.kind === SyntaxKind.BoltModule
|| source.node.kind === SyntaxKind.BoltFunctionDeclaration
|| source.node.kind === SyntaxKind.BoltBlockExpression;
case ScopeType.Type:
return node.kind === SyntaxKind.BoltModule
|| node.kind === SyntaxKind.BoltSourceFile
|| node.kind === SyntaxKind.BoltFunctionDeclaration
|| node.kind === SyntaxKind.BoltRecordDeclaration
|| node.kind === SyntaxKind.BoltTraitDeclaration
|| node.kind === SyntaxKind.BoltImplDeclaration;
return source.node.kind === SyntaxKind.BoltModule
|| source.node.kind === SyntaxKind.BoltSourceFile
|| source.node.kind === SyntaxKind.BoltFunctionDeclaration
|| source.node.kind === SyntaxKind.BoltRecordDeclaration
|| source.node.kind === SyntaxKind.BoltTraitDeclaration
|| source.node.kind === SyntaxKind.BoltImplDeclaration;
case ScopeType.Module:
return node.kind === SyntaxKind.BoltModule
|| node.kind === SyntaxKind.BoltRecordDeclaration
|| node.kind === SyntaxKind.BoltSourceFile;
return source.node.kind === SyntaxKind.BoltModule
|| source.node.kind === SyntaxKind.BoltRecordDeclaration
|| source.node.kind === SyntaxKind.BoltTraitDeclaration
|| source.node.kind === SyntaxKind.BoltSourceFile;
default:
throw new Error(`Invalid scope type detected.`)
}
}
throw new Error(`Invalid source type detected.`)
}
public *getNextScopeSources(source: ScopeSource, kind: ScopeType): IterableIterator<ScopeSource> {
public getNextScopeSource(source: ScopeSource, kind: ScopeType): ScopeSource | null {
// If we are in the global scope, there is no scope above it.
if (source instanceof GlobalScopeSource) {
return;
return null;
}
// If we are at a scope that was created by an AST node, we
@ -204,14 +218,12 @@ export class BoltSymbolResolutionStrategy implements ResolutionStrategy {
let currNode = source.node;
while (true) {
if (currNode.kind === SyntaxKind.BoltSourceFile) {
yield new PackageScopeSource(currNode.package);
return;
return new PackageScopeSource(currNode.package);
}
const nextNode = currNode.parentNode;
assert(nextNode !== null);
if (this.introducesNewScope(nextNode, kind)) {
yield new NodeScopeSource(nextNode);
return;
if (this.introducesNewScope(new NodeScopeSource(nextNode), kind)) {
return new NodeScopeSource(nextNode);
}
currNode = nextNode;
}
@ -220,8 +232,7 @@ export class BoltSymbolResolutionStrategy implements ResolutionStrategy {
// If we already are at the local package scope level, we go one up
// to the global scope shared by all packages.
if (source instanceof PackageScopeSource) {
yield new GlobalScopeSource();
return;
return new GlobalScopeSource();;
}
throw new Error(`Unknown scope source provided.`)
@ -239,6 +250,17 @@ class Scope {
private nextScope: Scope | null | undefined;
private symbols = new FastStringMap<string, SymbolInfo>();
public static findOrCreate(resolver: SymbolResolver, kind: ScopeType, source: ScopeSource): Scope {
const key = `${kind}:${source.id}`;
if (Scope.scopeCache.has(key)) {
return Scope.scopeCache.get(key);
} else {
const newScope = new Scope(resolver, kind, source);
Scope.scopeCache.set(key, newScope);
return newScope;
}
}
constructor(
private resolver: SymbolResolver,
public kind: ScopeType,
@ -252,26 +274,22 @@ class Scope {
}
public getScope(kind: ScopeType) {
if (Scope.scopeCache.has(this.globallyUniqueKey)) {
return Scope.scopeCache.get(this.globallyUniqueKey);
let source: ScopeSource = this.source;
while (!this.resolver.strategy.introducesNewScope(source, kind)) {
const nextSource = this.resolver.strategy.getNextScopeSource(source, kind);
assert(nextSource !== null);
source = nextSource!;
}
const newScope = new Scope(this.resolver, kind, this.source);
Scope.scopeCache.set(newScope.globallyUniqueKey, newScope);
return newScope;
return Scope.findOrCreate(this.resolver, kind, source);
}
public *getNextScopes(): IterableIterator<Scope> {
public getNextScope(): Scope | null {
let results = [];
for (const nextSource of this.resolver.strategy.getNextScopeSources(this.source, this.kind)) {
const key = `${this.kind}:${nextSource.id}`;
if (Scope.scopeCache.has(key)) {
yield Scope.scopeCache.get(key);
} else {
const newScope = new Scope(this.resolver, this.kind, nextSource);
Scope.scopeCache.set(key, newScope);
yield newScope;
}
const nextSource = this.resolver.strategy.getNextScopeSource(this.source, this.kind);
if (nextSource === null) {
return null;
}
return Scope.findOrCreate(this.resolver, this.kind, nextSource);
}
public getLocalSymbol(name: string) {
@ -293,16 +311,17 @@ class Scope {
}
public getSymbol(name: string): SymbolInfo | null {
const stack: Scope[] = [ this ];
while (stack.length > 0) {
const currScope = stack.pop()!;
let currScope: Scope = this;
while (true) {
const sym = currScope.getLocalSymbol(name);
if (sym !== null) {
return sym;
}
for (const nextScope of currScope.getNextScopes()) {
stack.push(nextScope);
const nextScope = currScope.getNextScope();
if (nextScope === null) {
break;
}
currScope = nextScope;
}
return null;
}
@ -349,11 +368,13 @@ export class SymbolResolver {
public registerSourceFile(node: SourceFile): void {
for (const childNode of node.preorder()) {
if (this.strategy.hasSymbol(node)) {
const name = this.strategy.getSymbolName(node);
const scope = this.getScopeForNode(node, this.strategy.getScopeType(node));
if (this.strategy.hasSymbol(childNode)) {
for (const scopeType of this.strategy.getScopeTypes(childNode)) {
const name = this.strategy.getSymbolName(childNode);
const scope = this.getScopeSurroundingNode(childNode, scopeType);
assert(scope !== null);
scope!.addNodeAsSymbol(name, node);
scope!.addNodeAsSymbol(name, childNode);
}
}
}
@ -374,13 +395,19 @@ export class SymbolResolver {
}
}
}
break;
default:
throw new Error(`Could not import symbols due to an unknown node.`)
}
}
} else {
for (const exportedNode of this.getAllExportedNodes(sourceFile)) {
const scope = this.getScopeForNode(importDir, this.strategy.getScopeType(exportedNode));
for (const exportedScopeType of this.strategy.getScopeTypes(exportedNode)) {
const importName = this.strategy.getSymbolName(exportedNode);
const scope = this.getScopeForNode(importDir, exportedScopeType);
assert(scope !== null);
scope!.addNodeAsSymbol(this.strategy.getSymbolName(exportedNode), exportedNode);
scope!.addNodeAsSymbol(importName, exportedNode);
}
}
}
}
@ -398,42 +425,40 @@ export class SymbolResolver {
}
}
public getScopeSurroundingNode(node: Syntax, kind: ScopeType): Scope | null {
public getScopeSurroundingNode(node: Syntax, kind: ScopeType = this.strategy.getScopeType(node)): Scope | null {
assert(node.parentNode !== null);
return this.getScopeForNode(node.parentNode!, kind);
}
public getScopeForNode(node: Syntax, kind: ScopeType): Scope | null {
public getScopeForNode(node: Syntax, kind: ScopeType = this.strategy.getScopeType(node)): Scope | null {
let source: ScopeSource = new NodeScopeSource(node);
if (!this.strategy.introducesNewScope(source, kind)) {
const sources = [...this.strategy.getNextScopeSources(source, kind)];
if (sources.length === 0) {
const nextSource = this.strategy.getNextScopeSource(source, kind);
if (nextSource === null) {
return null;
}
assert(sources.length === 1);
source = sources[0];
source = nextSource;
}
return new Scope(this, kind, source);
return Scope.findOrCreate(this, kind, source);
}
public resolveModulePath(path: string[], scope: Scope): Scope | null {
const stack: Scope[] = [ scope ];
let modScope = scope.getScope(ScopeType.Module);
// We will keep looping until we are at the topmost module of
// the package corresponding to `node`.
while (stack.length > 0) {
while (true) {
let shouldSearchNextScopes = false;
let scope = stack.pop()!;
let currScope = scope;
let failedToFindScope = false;
let currScope = modScope;
// Go through each of the parent names in normal order, resolving to the module
// that declared the name, and mark when we failed to look up the inner module.
for (const name of path) {
const sym = currScope.getLocalSymbol(name);
if (sym === null) {
shouldSearchNextScopes = true;
failedToFindScope = true;
break;
}
assert(every(sym.declarations.values(), decl => decl.kind === SyntaxKind.BoltModule));
@ -441,23 +466,25 @@ export class SymbolResolver {
}
// If the previous loop did not fail, we are done.
if (!shouldSearchNextScopes) {
return currScope;
if (!failedToFindScope) {
return currScope.getScope(scope.kind);
}
// We continue the outer loop by going up one scope.
for (const nextScope of scope.getNextScopes()) {
stack.push(nextScope);
const nextScope = modScope.getNextScope();
if (nextScope === null) {
break;
}
modScope = nextScope;
}
return null;
}
public getSymbolForNode(node: Syntax) {
public getSymbolForNode(node: Syntax, kind: ScopeType = this.strategy.getScopeType(node)) {
assert(this.strategy.hasSymbol(node));
const scope = this.getScopeForNode(node, this.strategy.getScopeType(node));
const scope = this.getScopeForNode(node, kind);
if (scope === null) {
return null;
}
@ -491,7 +518,7 @@ export class SymbolResolver {
// Once we've handled any module path that might have been present,
// we resolve the actual symbol using a helper method.
const sym = scope.getExportedSymbol(path.name);
const sym = scope.getSymbol(path.name);
if (sym === null) {
return null;