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285 lines
7.7 KiB
C++
285 lines
7.7 KiB
C++
//===- SourceEntityWalker.cpp - Routines for semantic source info ---------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/IDE/SourceEntityWalker.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/ASTWalker.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Expr.h"
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#include "swift/AST/Module.h"
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#include "swift/AST/Pattern.h"
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#include "swift/AST/TypeRepr.h"
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#include "swift/AST/Types.h"
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#include "swift/Basic/SourceManager.h"
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using namespace swift;
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using namespace ide;
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namespace {
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class SemaAnnotator : public ASTWalker {
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SourceEntityWalker &SEWalker;
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SmallVector<ConstructorRefCallExpr *, 2> CtorRefs;
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bool Cancelled = false;
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public:
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explicit SemaAnnotator(SourceEntityWalker &SEWalker)
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: SEWalker(SEWalker) { }
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bool isDone() const { return Cancelled; }
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private:
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bool walkToDeclPre(Decl *D) override;
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std::pair<bool, Expr *> walkToExprPre(Expr *E) override;
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bool walkToTypeReprPre(TypeRepr *T) override;
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bool walkToDeclPost(Decl *D) override;
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Expr *walkToExprPost(Expr *E) override;
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bool walkToTypeReprPost(TypeRepr *T) override;
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std::pair<bool, Stmt *> walkToStmtPre(Stmt *S) override;
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Stmt *walkToStmtPost(Stmt *S) override;
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std::pair<bool, Pattern *> walkToPatternPre(Pattern *P) override;
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bool passReference(ValueDecl *D, SourceLoc Loc);
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TypeDecl *getTypeDecl(Type Ty);
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bool shouldIgnore(Decl *D, bool &ShouldVisitChildren);
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ValueDecl *extractDecl(Expr *Fn) const {
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Fn))
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return DRE->getDecl();
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return nullptr;
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}
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};
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}
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bool SemaAnnotator::walkToDeclPre(Decl *D) {
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if (isDone())
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return false;
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bool ShouldVisitChildren;
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if (shouldIgnore(D, ShouldVisitChildren))
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return ShouldVisitChildren;
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SourceLoc Loc = D->getLoc();
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unsigned NameLen = 0;
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if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
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if (VD->hasName())
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NameLen = VD->getName().getLength();
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} else if (ExtensionDecl *ED = dyn_cast<ExtensionDecl>(D)) {
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if (TypeRepr *TR = ED->getExtendedTypeLoc().getTypeRepr()) {
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SourceRange SR = TR->getSourceRange();
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Loc = SR.Start;
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NameLen = ED->getASTContext().SourceMgr.getByteDistance(SR.Start, SR.End);
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} else {
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Loc = SourceLoc();
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}
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} else {
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return true;
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}
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CharSourceRange Range = (Loc.isValid()) ? CharSourceRange(Loc, NameLen)
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: CharSourceRange();
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return SEWalker.walkToDeclPre(D, Range);
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}
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bool SemaAnnotator::walkToDeclPost(Decl *D) {
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if (isDone())
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return false;
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bool ShouldVisitChildren;
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if (shouldIgnore(D, ShouldVisitChildren))
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return true;
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bool Continue = SEWalker.walkToDeclPost(D);
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if (!Continue)
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Cancelled = true;
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return Continue;
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}
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std::pair<bool, Stmt *> SemaAnnotator::walkToStmtPre(Stmt *S) {
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bool TraverseChildren = SEWalker.walkToStmtPre(S);
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return { TraverseChildren, S };
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}
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Stmt *SemaAnnotator::walkToStmtPost(Stmt *S) {
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bool Continue = SEWalker.walkToStmtPost(S);
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if (!Continue)
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Cancelled = true;
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return Continue ? S : nullptr;
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}
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std::pair<bool, Expr *> SemaAnnotator::walkToExprPre(Expr *E) {
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if (isDone())
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return { false, nullptr };
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if (!SEWalker.walkToExprPre(E))
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return { false, E };
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if (ConstructorRefCallExpr *CtorRefE = dyn_cast<ConstructorRefCallExpr>(E))
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CtorRefs.push_back(CtorRefE);
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if (E->isImplicit())
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return { true, E };
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
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if (!passReference(DRE->getDecl(), E->getLoc()))
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return { false, nullptr };
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} else if (MemberRefExpr *MRE = dyn_cast<MemberRefExpr>(E)) {
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// Visit in source order.
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if (!MRE->getBase()->walk(*this))
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return { false, nullptr };
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if (!passReference(MRE->getMember().getDecl(), E->getLoc()))
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return { false, nullptr };
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// We already visited the children.
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if (!walkToExprPost(E))
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return { false, nullptr };
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return { false, E };
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} else if (auto OtherCtorE = dyn_cast<OtherConstructorDeclRefExpr>(E)) {
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if (!passReference(OtherCtorE->getDecl(), OtherCtorE->getConstructorLoc()))
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return { false, nullptr };
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} else if (SubscriptExpr *SE = dyn_cast<SubscriptExpr>(E)) {
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if (SE->hasDecl())
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if (!passReference(SE->getDecl().getDecl(), E->getLoc()))
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return { false, nullptr };
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} else if (BinaryExpr *BinE = dyn_cast<BinaryExpr>(E)) {
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// Visit in source order.
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if (!BinE->getArg()->getElement(0)->walk(*this))
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return { false, nullptr };
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if (!BinE->getFn()->walk(*this))
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return { false, nullptr };
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if (!BinE->getArg()->getElement(1)->walk(*this))
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return { false, nullptr };
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// We already visited the children.
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if (!walkToExprPost(E))
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return { false, nullptr };
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return { false, E };
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}
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return { true, E };
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}
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bool SemaAnnotator::walkToTypeReprPre(TypeRepr *T) {
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if (isDone())
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return false;
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if (auto IdT = dyn_cast<ComponentIdentTypeRepr>(T)) {
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if (ValueDecl *VD = IdT->getBoundDecl())
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return passReference(VD, IdT->getIdLoc());
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if (TypeDecl *TyD = getTypeDecl(IdT->getBoundType()))
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return passReference(TyD, IdT->getIdLoc());
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}
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return true;
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}
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Expr *SemaAnnotator::walkToExprPost(Expr *E) {
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if (isa<ConstructorRefCallExpr>(E)) {
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assert(CtorRefs.back() == E);
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CtorRefs.pop_back();
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}
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bool Continue = SEWalker.walkToExprPost(E);
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if (!Continue)
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Cancelled = true;
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return Continue ? E : nullptr;
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}
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bool SemaAnnotator::walkToTypeReprPost(TypeRepr *T) {
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if (isDone())
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return false;
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return true;
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}
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std::pair<bool, Pattern *> SemaAnnotator::walkToPatternPre(Pattern *P) {
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auto *TP = dyn_cast<TypedPattern>(P);
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if (!TP || !TP->isPropagatedType())
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return { true, P };
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// If the typed pattern was propagated from somewhere, just walk the
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// subpattern. The type will be walked as a part of another TypedPattern.
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TP->getSubPattern()->walk(*this);
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return { false, P };
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}
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bool SemaAnnotator::passReference(ValueDecl *D, SourceLoc Loc) {
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unsigned NameLen = D->getName().getLength();
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TypeDecl *CtorTyRef = nullptr;
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if (TypeDecl *TD = dyn_cast<TypeDecl>(D)) {
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if (!CtorRefs.empty() && Loc.isValid()) {
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Expr *Fn = CtorRefs.back()->getFn();
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if (Fn->getLoc() == Loc) {
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D = extractDecl(Fn);
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CtorTyRef = TD;
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}
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}
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}
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CharSourceRange Range = (Loc.isValid()) ? CharSourceRange(Loc, NameLen)
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: CharSourceRange();
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bool Continue = SEWalker.visitDeclReference(D, Range, CtorTyRef);
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if (!Continue)
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Cancelled = true;
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return Continue;
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}
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TypeDecl *SemaAnnotator::getTypeDecl(Type Ty) {
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if (Ty.isNull())
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return nullptr;
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if (NameAliasType *NAT = dyn_cast<NameAliasType>(Ty.getPointer()))
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return NAT->getDecl();
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return Ty->getAnyNominal();
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}
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bool SemaAnnotator::shouldIgnore(Decl *D, bool &ShouldVisitChildren) {
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if (D->isImplicit()) {
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ShouldVisitChildren = false;
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return true;
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}
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return false;
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}
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bool SourceEntityWalker::walk(SourceFile &SrcFile) {
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SemaAnnotator Annotator(*this);
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return SrcFile.walk(Annotator);
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}
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bool SourceEntityWalker::walk(Module &Mod) {
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SemaAnnotator Annotator(*this);
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return Mod.walk(Annotator);
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}
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bool SourceEntityWalker::walk(Decl *D) {
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SemaAnnotator Annotator(*this);
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return D->walk(Annotator);
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}
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bool SourceEntityWalker::walk(DeclContext *DC) {
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SemaAnnotator Annotator(*this);
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return DC->walkContext(Annotator);
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}
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void SourceEntityWalker::anchor() {}
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