1/*
2 * Copyright 2011, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "slang_rs_ast_replace.h"
18
19#include "slang_assert.h"
20
21#include "llvm/Support/Casting.h"
22
23namespace slang {
24
25void RSASTReplace::ReplaceStmt(
26    clang::Stmt *OuterStmt,
27    clang::Stmt *OldStmt,
28    clang::Stmt *NewStmt) {
29  mOldStmt = OldStmt;
30  mNewStmt = NewStmt;
31  mOuterStmt = OuterStmt;
32
33  // This simplifies use in various Stmt visitor passes where the only
34  // valid type is an Expr.
35  mOldExpr = llvm::dyn_cast<clang::Expr>(OldStmt);
36  if (mOldExpr) {
37    mNewExpr = llvm::dyn_cast<clang::Expr>(NewStmt);
38  }
39  Visit(mOuterStmt);
40}
41
42void RSASTReplace::ReplaceInCompoundStmt(clang::CompoundStmt *CS) {
43  clang::Stmt **UpdatedStmtList = new clang::Stmt*[CS->size()];
44
45  unsigned UpdatedStmtCount = 0;
46  clang::CompoundStmt::body_iterator bI = CS->body_begin();
47  clang::CompoundStmt::body_iterator bE = CS->body_end();
48
49  for ( ; bI != bE; bI++) {
50    if (matchesStmt(*bI)) {
51      UpdatedStmtList[UpdatedStmtCount++] = mNewStmt;
52    } else {
53      UpdatedStmtList[UpdatedStmtCount++] = *bI;
54    }
55  }
56
57  CS->setStmts(C, UpdatedStmtList, UpdatedStmtCount);
58
59  delete [] UpdatedStmtList;
60
61  return;
62}
63
64void RSASTReplace::VisitStmt(clang::Stmt *S) {
65  // This function does the actual iteration through all sub-Stmt's within
66  // a given Stmt. Note that this function is skipped by all of the other
67  // Visit* functions if we have already found a higher-level match.
68  for (clang::Stmt::child_iterator I = S->child_begin(), E = S->child_end();
69       I != E;
70       I++) {
71    if (clang::Stmt *Child = *I) {
72      if (!matchesStmt(Child)) {
73        Visit(Child);
74      }
75    }
76  }
77  return;
78}
79
80void RSASTReplace::VisitCompoundStmt(clang::CompoundStmt *CS) {
81  VisitStmt(CS);
82  ReplaceInCompoundStmt(CS);
83  return;
84}
85
86void RSASTReplace::VisitCaseStmt(clang::CaseStmt *CS) {
87  if (matchesStmt(CS->getSubStmt())) {
88    CS->setSubStmt(mNewStmt);
89  } else {
90    VisitStmt(CS);
91  }
92  return;
93}
94
95void RSASTReplace::VisitDefaultStmt(clang::DefaultStmt *DS) {
96  if (matchesStmt(DS->getSubStmt())) {
97    DS->setSubStmt(mNewStmt);
98  } else {
99    VisitStmt(DS);
100  }
101  return;
102}
103
104void RSASTReplace::VisitDoStmt(clang::DoStmt *DS) {
105  if (matchesExpr(DS->getCond())) {
106    DS->setCond(mNewExpr);
107  } else if (matchesStmt(DS->getBody())) {
108    DS->setBody(mNewStmt);
109  } else {
110    VisitStmt(DS);
111  }
112  return;
113}
114
115void RSASTReplace::VisitForStmt(clang::ForStmt *FS) {
116  if (matchesStmt(FS->getInit())) {
117    FS->setInit(mNewStmt);
118  } else if (matchesExpr(FS->getCond())) {
119    FS->setCond(mNewExpr);
120  } else if (matchesExpr(FS->getInc())) {
121    FS->setInc(mNewExpr);
122  } else if (matchesStmt(FS->getBody())) {
123    FS->setBody(mNewStmt);
124  } else {
125    VisitStmt(FS);
126  }
127  return;
128}
129
130void RSASTReplace::VisitIfStmt(clang::IfStmt *IS) {
131  if (matchesExpr(IS->getCond())) {
132    IS->setCond(mNewExpr);
133  } else if (matchesStmt(IS->getThen())) {
134    IS->setThen(mNewStmt);
135  } else if (matchesStmt(IS->getElse())) {
136    IS->setElse(mNewStmt);
137  } else {
138    VisitStmt(IS);
139  }
140  return;
141}
142
143void RSASTReplace::VisitSwitchCase(clang::SwitchCase *SC) {
144  slangAssert(false && "Both case and default have specialized handlers");
145  VisitStmt(SC);
146  return;
147}
148
149void RSASTReplace::VisitSwitchStmt(clang::SwitchStmt *SS) {
150  if (matchesExpr(SS->getCond())) {
151    SS->setCond(mNewExpr);
152  } else {
153    VisitStmt(SS);
154  }
155  return;
156}
157
158void RSASTReplace::VisitWhileStmt(clang::WhileStmt *WS) {
159  if (matchesExpr(WS->getCond())) {
160    WS->setCond(mNewExpr);
161  } else if (matchesStmt(WS->getBody())) {
162    WS->setBody(mNewStmt);
163  } else {
164    VisitStmt(WS);
165  }
166  return;
167}
168
169}  // namespace slang
170