forked from OSchip/llvm-project
90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
//===--- ParentMap.cpp - Mappings from Stmts to their Parents ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the ParentMap class.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ParentMap.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/Expr.h"
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#include "llvm/ADT/DenseMap.h"
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using namespace clang;
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typedef llvm::DenseMap<Stmt*, Stmt*> MapTy;
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static void BuildParentMap(MapTy& M, Stmt* S) {
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for (Stmt::child_iterator I=S->child_begin(), E=S->child_end(); I!=E; ++I)
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if (*I) {
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M[*I] = S;
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BuildParentMap(M, *I);
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}
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}
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ParentMap::ParentMap(Stmt* S) : Impl(0) {
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if (S) {
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MapTy *M = new MapTy();
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BuildParentMap(*M, S);
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Impl = M;
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}
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}
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ParentMap::~ParentMap() {
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delete (MapTy*) Impl;
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}
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Stmt* ParentMap::getParent(Stmt* S) const {
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MapTy* M = (MapTy*) Impl;
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MapTy::iterator I = M->find(S);
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return I == M->end() ? 0 : I->second;
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}
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bool ParentMap::isConsumedExpr(Expr* E) const {
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Stmt *P = getParent(E);
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Stmt *DirectChild = E;
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// Ignore parents that are parentheses or casts.
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while (P && (isa<ParenExpr>(P) || isa<CastExpr>(P))) {
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DirectChild = P;
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P = getParent(P);
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}
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if (!P)
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return false;
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switch (P->getStmtClass()) {
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default:
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return isa<Expr>(P);
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case Stmt::DeclStmtClass:
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return true;
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case Stmt::BinaryOperatorClass: {
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BinaryOperator *BE = cast<BinaryOperator>(P);
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// If it is a comma, only the right side is consumed.
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// If it isn't a comma, both sides are consumed.
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return BE->getOpcode()!=BinaryOperator::Comma ||DirectChild==BE->getRHS();
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}
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case Stmt::ForStmtClass:
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return DirectChild == cast<ForStmt>(P)->getCond();
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case Stmt::WhileStmtClass:
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return DirectChild == cast<WhileStmt>(P)->getCond();
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case Stmt::DoStmtClass:
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return DirectChild == cast<DoStmt>(P)->getCond();
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case Stmt::IfStmtClass:
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return DirectChild == cast<IfStmt>(P)->getCond();
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case Stmt::IndirectGotoStmtClass:
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return DirectChild == cast<IndirectGotoStmt>(P)->getTarget();
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case Stmt::SwitchStmtClass:
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return DirectChild == cast<SwitchStmt>(P)->getCond();
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case Stmt::ReturnStmtClass:
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return true;
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}
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}
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