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c8ed1954f2
We still want to allow line wrapping, so only issue the warning when the indentation of the expression and the return keyword is the same. radar://11945406 Swift SVN r9984
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
//===--- MiscDiagnostics.cpp - AST-Level Diagnostics ----------------------===//
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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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//
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// This file implements AST-level diagnostics.
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//
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//===----------------------------------------------------------------------===//
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#include "MiscDiagnostics.h"
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#include "TypeChecker.h"
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#include "swift/Basic/SourceManager.h"
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using namespace swift;
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//===--------------------------------------------------------------------===//
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// Diagnose assigning variable to itself.
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//===--------------------------------------------------------------------===//
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static Decl *findSimpleReferencedDecl(const Expr *E) {
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if (auto *LE = dyn_cast<LoadExpr>(E))
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E = LE->getSubExpr();
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if (auto *DRE = dyn_cast<DeclRefExpr>(E))
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return DRE->getDecl();
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return nullptr;
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}
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static std::pair<Decl *, Decl *> findReferencedDecl(const Expr *E) {
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if (auto *LE = dyn_cast<LoadExpr>(E))
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E = LE->getSubExpr();
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if (auto *D = findSimpleReferencedDecl(E))
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return std::make_pair(nullptr, D);
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if (auto *MRE = dyn_cast<MemberRefExpr>(E)) {
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return std::make_pair(findSimpleReferencedDecl(MRE->getBase()),
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MRE->getMember().getDecl());
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}
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return std::make_pair(nullptr, nullptr);
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}
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static void diagSelfAssignment(TypeChecker &TC, const Expr *E) {
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auto *AE = dyn_cast<AssignExpr>(E);
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if (!AE)
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return;
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auto LHSDecl = findReferencedDecl(AE->getDest());
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auto RHSDecl = findReferencedDecl(AE->getSrc());
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if (LHSDecl.second && LHSDecl == RHSDecl) {
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TC.diagnose(AE->getLoc(), LHSDecl.first ? diag::self_assignment_prop
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: diag::self_assignment_var)
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.highlight(AE->getDest()->getSourceRange())
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.highlight(AE->getSrc()->getSourceRange());
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}
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}
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//===--------------------------------------------------------------------===//
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// Diagnose unreachable code.
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//===--------------------------------------------------------------------===//
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/// Issue a warning on code containing retrun expression on a differnt line than
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/// the return keyword and both have the same indentation:
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/// ...
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/// return
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/// foo()
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static void diagUnreachableCode(TypeChecker &TC, const Stmt *S) {
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auto *RS = dyn_cast<ReturnStmt>(S);
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if (!RS)
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return;
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if (!RS->hasResult())
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return;
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auto RetExpr = RS->getResult();
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auto RSLoc = RS->getStartLoc();
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auto RetExprLoc = RetExpr->getStartLoc();
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if (RSLoc.isInvalid() || RetExprLoc.isInvalid() || (RSLoc == RetExprLoc))
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return;
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SourceManager &SM = TC.Context.SourceMgr;
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if (SM.getLineAndColumn(RSLoc).second ==
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SM.getLineAndColumn(RetExprLoc).second) {
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TC.diagnose(RetExpr->getStartLoc(), diag::unreachable_code_after_return);
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return;
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}
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return;
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}
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//===--------------------------------------------------------------------===//
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// High-level entry points.
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//===--------------------------------------------------------------------===//
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void swift::performExprDiagnostics(TypeChecker &TC, const Expr *E) {
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diagSelfAssignment(TC, E);
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}
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void swift::performStmtDiagnostics(TypeChecker &TC, const Stmt *S) {
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return diagUnreachableCode(TC, S);
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}
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