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
23 namespace slang {
24
ReplaceStmt(clang::Stmt * OuterStmt,clang::Stmt * OldStmt,clang::Stmt * NewStmt)25 void 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
ReplaceInCompoundStmt(clang::CompoundStmt * CS)42 void 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
VisitStmt(clang::Stmt * S)64 void 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
VisitCompoundStmt(clang::CompoundStmt * CS)80 void RSASTReplace::VisitCompoundStmt(clang::CompoundStmt *CS) {
81 VisitStmt(CS);
82 ReplaceInCompoundStmt(CS);
83 return;
84 }
85
VisitCaseStmt(clang::CaseStmt * CS)86 void RSASTReplace::VisitCaseStmt(clang::CaseStmt *CS) {
87 if (matchesStmt(CS->getSubStmt())) {
88 CS->setSubStmt(mNewStmt);
89 } else {
90 VisitStmt(CS);
91 }
92 return;
93 }
94
VisitDefaultStmt(clang::DefaultStmt * DS)95 void RSASTReplace::VisitDefaultStmt(clang::DefaultStmt *DS) {
96 if (matchesStmt(DS->getSubStmt())) {
97 DS->setSubStmt(mNewStmt);
98 } else {
99 VisitStmt(DS);
100 }
101 return;
102 }
103
VisitDoStmt(clang::DoStmt * DS)104 void 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
VisitForStmt(clang::ForStmt * FS)115 void 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
VisitIfStmt(clang::IfStmt * IS)130 void 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
VisitSwitchCase(clang::SwitchCase * SC)143 void RSASTReplace::VisitSwitchCase(clang::SwitchCase *SC) {
144 slangAssert(false && "Both case and default have specialized handlers");
145 VisitStmt(SC);
146 return;
147 }
148
VisitSwitchStmt(clang::SwitchStmt * SS)149 void RSASTReplace::VisitSwitchStmt(clang::SwitchStmt *SS) {
150 if (matchesExpr(SS->getCond())) {
151 SS->setCond(mNewExpr);
152 } else {
153 VisitStmt(SS);
154 }
155 return;
156 }
157
VisitWhileStmt(clang::WhileStmt * WS)158 void 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