1 //===--- StmtCXX.cpp - Classes for representing C++ statements ------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the subclesses of Stmt class declared in StmtCXX.h
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/AST/StmtCXX.h"
15 
16 #include "clang/AST/ASTContext.h"
17 
18 using namespace clang;
19 
20 QualType CXXCatchStmt::getCaughtType() const {
21   if (ExceptionDecl)
22     return ExceptionDecl->getType();
23   return QualType();
24 }
25 
26 CXXTryStmt *CXXTryStmt::Create(const ASTContext &C, SourceLocation tryLoc,
27                                Stmt *tryBlock, ArrayRef<Stmt *> handlers) {
28   std::size_t Size = sizeof(CXXTryStmt);
29   Size += ((handlers.size() + 1) * sizeof(Stmt *));
30 
31   void *Mem = C.Allocate(Size, alignof(CXXTryStmt));
32   return new (Mem) CXXTryStmt(tryLoc, tryBlock, handlers);
33 }
34 
35 CXXTryStmt *CXXTryStmt::Create(const ASTContext &C, EmptyShell Empty,
36                                unsigned numHandlers) {
37   std::size_t Size = sizeof(CXXTryStmt);
38   Size += ((numHandlers + 1) * sizeof(Stmt *));
39 
40   void *Mem = C.Allocate(Size, alignof(CXXTryStmt));
41   return new (Mem) CXXTryStmt(Empty, numHandlers);
42 }
43 
44 CXXTryStmt::CXXTryStmt(SourceLocation tryLoc, Stmt *tryBlock,
45                        ArrayRef<Stmt *> handlers)
46     : Stmt(CXXTryStmtClass), TryLoc(tryLoc), NumHandlers(handlers.size()) {
47   Stmt **Stmts = reinterpret_cast<Stmt **>(this + 1);
48   Stmts[0] = tryBlock;
49   std::copy(handlers.begin(), handlers.end(), Stmts + 1);
50 }
51 
52 CXXForRangeStmt::CXXForRangeStmt(DeclStmt *Range,
53                                  DeclStmt *BeginStmt, DeclStmt *EndStmt,
54                                  Expr *Cond, Expr *Inc, DeclStmt *LoopVar,
55                                  Stmt *Body, SourceLocation FL,
56                                  SourceLocation CAL, SourceLocation CL,
57                                  SourceLocation RPL)
58     : Stmt(CXXForRangeStmtClass), ForLoc(FL), CoawaitLoc(CAL), ColonLoc(CL),
59       RParenLoc(RPL) {
60   SubExprs[RANGE] = Range;
61   SubExprs[BEGINSTMT] = BeginStmt;
62   SubExprs[ENDSTMT] = EndStmt;
63   SubExprs[COND] = Cond;
64   SubExprs[INC] = Inc;
65   SubExprs[LOOPVAR] = LoopVar;
66   SubExprs[BODY] = Body;
67 }
68 
69 Expr *CXXForRangeStmt::getRangeInit() {
70   DeclStmt *RangeStmt = getRangeStmt();
71   VarDecl *RangeDecl = dyn_cast_or_null<VarDecl>(RangeStmt->getSingleDecl());
72   assert(RangeDecl && "for-range should have a single var decl");
73   return RangeDecl->getInit();
74 }
75 
76 const Expr *CXXForRangeStmt::getRangeInit() const {
77   return const_cast<CXXForRangeStmt *>(this)->getRangeInit();
78 }
79 
80 VarDecl *CXXForRangeStmt::getLoopVariable() {
81   Decl *LV = cast<DeclStmt>(getLoopVarStmt())->getSingleDecl();
82   assert(LV && "No loop variable in CXXForRangeStmt");
83   return cast<VarDecl>(LV);
84 }
85 
86 const VarDecl *CXXForRangeStmt::getLoopVariable() const {
87   return const_cast<CXXForRangeStmt *>(this)->getLoopVariable();
88 }
89 
90 CoroutineBodyStmt *CoroutineBodyStmt::Create(
91     const ASTContext &C, CoroutineBodyStmt::CtorArgs const &Args) {
92   std::size_t Size = totalSizeToAlloc<Stmt *>(
93       CoroutineBodyStmt::FirstParamMove + Args.ParamMoves.size());
94 
95   void *Mem = C.Allocate(Size, alignof(CoroutineBodyStmt));
96   return new (Mem) CoroutineBodyStmt(Args);
97 }
98 
99 CoroutineBodyStmt *CoroutineBodyStmt::Create(const ASTContext &C, EmptyShell,
100                                              unsigned NumParams) {
101   std::size_t Size = totalSizeToAlloc<Stmt *>(
102       CoroutineBodyStmt::FirstParamMove + NumParams);
103 
104   void *Mem = C.Allocate(Size, alignof(CoroutineBodyStmt));
105   auto *Result = new (Mem) CoroutineBodyStmt(CtorArgs());
106   Result->NumParams = NumParams;
107   auto *ParamBegin = Result->getStoredStmts() + SubStmt::FirstParamMove;
108   std::uninitialized_fill(ParamBegin, ParamBegin + NumParams,
109                           static_cast<Stmt *>(nullptr));
110   return Result;
111 }
112 
113 CoroutineBodyStmt::CoroutineBodyStmt(CoroutineBodyStmt::CtorArgs const &Args)
114     : Stmt(CoroutineBodyStmtClass), NumParams(Args.ParamMoves.size()) {
115   Stmt **SubStmts = getStoredStmts();
116   SubStmts[CoroutineBodyStmt::Body] = Args.Body;
117   SubStmts[CoroutineBodyStmt::Promise] = Args.Promise;
118   SubStmts[CoroutineBodyStmt::InitSuspend] = Args.InitialSuspend;
119   SubStmts[CoroutineBodyStmt::FinalSuspend] = Args.FinalSuspend;
120   SubStmts[CoroutineBodyStmt::OnException] = Args.OnException;
121   SubStmts[CoroutineBodyStmt::OnFallthrough] = Args.OnFallthrough;
122   SubStmts[CoroutineBodyStmt::Allocate] = Args.Allocate;
123   SubStmts[CoroutineBodyStmt::Deallocate] = Args.Deallocate;
124   SubStmts[CoroutineBodyStmt::ReturnValue] = Args.ReturnValue;
125   SubStmts[CoroutineBodyStmt::ResultDecl] = Args.ResultDecl;
126   SubStmts[CoroutineBodyStmt::ReturnStmt] = Args.ReturnStmt;
127   SubStmts[CoroutineBodyStmt::ReturnStmtOnAllocFailure] =
128       Args.ReturnStmtOnAllocFailure;
129   std::copy(Args.ParamMoves.begin(), Args.ParamMoves.end(),
130             const_cast<Stmt **>(getParamMoves().data()));
131 }
132