1 //===--- ParentMap.cpp - Mappings from Stmts to their Parents ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the ParentMap class.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ParentMap.h"
15 #include "clang/AST/Decl.h"
16 #include "clang/AST/Expr.h"
17 #include "llvm/ADT/DenseMap.h"
19 using namespace clang;
21 typedef llvm::DenseMap<Stmt*, Stmt*> MapTy;
23 enum OpaqueValueMode {
28 static void BuildParentMap(MapTy& M, Stmt* S,
29 OpaqueValueMode OVMode = OV_Transparent) {
31 switch (S->getStmtClass()) {
32 case Stmt::PseudoObjectExprClass: {
33 assert(OVMode == OV_Transparent && "Should not appear alongside OVEs");
34 PseudoObjectExpr *POE = cast<PseudoObjectExpr>(S);
36 M[POE->getSyntacticForm()] = S;
37 BuildParentMap(M, POE->getSyntacticForm(), OV_Transparent);
39 for (PseudoObjectExpr::semantics_iterator I = POE->semantics_begin(),
40 E = POE->semantics_end();
43 BuildParentMap(M, *I, OV_Opaque);
47 case Stmt::BinaryConditionalOperatorClass: {
48 assert(OVMode == OV_Transparent && "Should not appear alongside OVEs");
49 BinaryConditionalOperator *BCO = cast<BinaryConditionalOperator>(S);
51 M[BCO->getCommon()] = S;
52 BuildParentMap(M, BCO->getCommon(), OV_Transparent);
54 M[BCO->getCond()] = S;
55 BuildParentMap(M, BCO->getCond(), OV_Opaque);
57 M[BCO->getTrueExpr()] = S;
58 BuildParentMap(M, BCO->getTrueExpr(), OV_Opaque);
60 M[BCO->getFalseExpr()] = S;
61 BuildParentMap(M, BCO->getFalseExpr(), OV_Transparent);
65 case Stmt::OpaqueValueExprClass:
66 if (OVMode == OV_Transparent) {
67 OpaqueValueExpr *OVE = cast<OpaqueValueExpr>(S);
68 M[OVE->getSourceExpr()] = S;
69 BuildParentMap(M, OVE->getSourceExpr(), OV_Transparent);
73 for (Stmt::child_range I = S->children(); I; ++I) {
76 BuildParentMap(M, *I, OVMode);
83 ParentMap::ParentMap(Stmt* S) : Impl(0) {
85 MapTy *M = new MapTy();
86 BuildParentMap(*M, S);
91 ParentMap::~ParentMap() {
95 void ParentMap::addStmt(Stmt* S) {
97 BuildParentMap(*(MapTy*) Impl, S);
101 Stmt* ParentMap::getParent(Stmt* S) const {
102 MapTy* M = (MapTy*) Impl;
103 MapTy::iterator I = M->find(S);
104 return I == M->end() ? 0 : I->second;
107 Stmt *ParentMap::getParentIgnoreParens(Stmt *S) const {
108 do { S = getParent(S); } while (S && isa<ParenExpr>(S));
112 Stmt *ParentMap::getParentIgnoreParenCasts(Stmt *S) const {
116 while (S && (isa<ParenExpr>(S) || isa<CastExpr>(S)));
121 Stmt *ParentMap::getParentIgnoreParenImpCasts(Stmt *S) const {
124 } while (S && isa<Expr>(S) && cast<Expr>(S)->IgnoreParenImpCasts() != S);
129 Stmt *ParentMap::getOuterParenParent(Stmt *S) const {
131 while (isa<ParenExpr>(S)) {
138 bool ParentMap::isConsumedExpr(Expr* E) const {
139 Stmt *P = getParent(E);
140 Stmt *DirectChild = E;
142 // Ignore parents that are parentheses or casts.
143 while (P && (isa<ParenExpr>(P) || isa<CastExpr>(P))) {
151 switch (P->getStmtClass()) {
154 case Stmt::DeclStmtClass:
156 case Stmt::BinaryOperatorClass: {
157 BinaryOperator *BE = cast<BinaryOperator>(P);
158 // If it is a comma, only the right side is consumed.
159 // If it isn't a comma, both sides are consumed.
160 return BE->getOpcode()!=BO_Comma ||DirectChild==BE->getRHS();
162 case Stmt::ForStmtClass:
163 return DirectChild == cast<ForStmt>(P)->getCond();
164 case Stmt::WhileStmtClass:
165 return DirectChild == cast<WhileStmt>(P)->getCond();
166 case Stmt::DoStmtClass:
167 return DirectChild == cast<DoStmt>(P)->getCond();
168 case Stmt::IfStmtClass:
169 return DirectChild == cast<IfStmt>(P)->getCond();
170 case Stmt::IndirectGotoStmtClass:
171 return DirectChild == cast<IndirectGotoStmt>(P)->getTarget();
172 case Stmt::SwitchStmtClass:
173 return DirectChild == cast<SwitchStmt>(P)->getCond();
174 case Stmt::ReturnStmtClass: