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   const size_t Size = totalSizeToAlloc<Stmt *>(handlers.size() + 1);
29   void *Mem = C.Allocate(Size, alignof(CXXTryStmt));
30   return new (Mem) CXXTryStmt(tryLoc, tryBlock, handlers);
31 }
32 
33 CXXTryStmt *CXXTryStmt::Create(const ASTContext &C, EmptyShell Empty,
34                                unsigned numHandlers) {
35   const size_t Size = totalSizeToAlloc<Stmt *>(numHandlers + 1);
36   void *Mem = C.Allocate(Size, alignof(CXXTryStmt));
37   return new (Mem) CXXTryStmt(Empty, numHandlers);
38 }
39 
40 CXXTryStmt::CXXTryStmt(SourceLocation tryLoc, Stmt *tryBlock,
41                        ArrayRef<Stmt *> handlers)
42     : Stmt(CXXTryStmtClass), TryLoc(tryLoc), NumHandlers(handlers.size()) {
43   Stmt **Stmts = getStmts();
44   Stmts[0] = tryBlock;
45   std::copy(handlers.begin(), handlers.end(), Stmts + 1);
46 }
47 
48 CXXForRangeStmt::CXXForRangeStmt(DeclStmt *Range,
49                                  DeclStmt *BeginStmt, DeclStmt *EndStmt,
50                                  Expr *Cond, Expr *Inc, DeclStmt *LoopVar,
51                                  Stmt *Body, SourceLocation FL,
52                                  SourceLocation CAL, SourceLocation CL,
53                                  SourceLocation RPL)
54     : Stmt(CXXForRangeStmtClass), ForLoc(FL), CoawaitLoc(CAL), ColonLoc(CL),
55       RParenLoc(RPL) {
56   SubExprs[RANGE] = Range;
57   SubExprs[BEGINSTMT] = BeginStmt;
58   SubExprs[ENDSTMT] = EndStmt;
59   SubExprs[COND] = Cond;
60   SubExprs[INC] = Inc;
61   SubExprs[LOOPVAR] = LoopVar;
62   SubExprs[BODY] = Body;
63 }
64 
65 Expr *CXXForRangeStmt::getRangeInit() {
66   DeclStmt *RangeStmt = getRangeStmt();
67   VarDecl *RangeDecl = dyn_cast_or_null<VarDecl>(RangeStmt->getSingleDecl());
68   assert(RangeDecl && "for-range should have a single var decl");
69   return RangeDecl->getInit();
70 }
71 
72 const Expr *CXXForRangeStmt::getRangeInit() const {
73   return const_cast<CXXForRangeStmt *>(this)->getRangeInit();
74 }
75 
76 VarDecl *CXXForRangeStmt::getLoopVariable() {
77   Decl *LV = cast<DeclStmt>(getLoopVarStmt())->getSingleDecl();
78   assert(LV && "No loop variable in CXXForRangeStmt");
79   return cast<VarDecl>(LV);
80 }
81 
82 const VarDecl *CXXForRangeStmt::getLoopVariable() const {
83   return const_cast<CXXForRangeStmt *>(this)->getLoopVariable();
84 }
85 
86 CoroutineBodyStmt *CoroutineBodyStmt::Create(
87     const ASTContext &C, CoroutineBodyStmt::CtorArgs const &Args) {
88   std::size_t Size = totalSizeToAlloc<Stmt *>(
89       CoroutineBodyStmt::FirstParamMove + Args.ParamMoves.size());
90 
91   void *Mem = C.Allocate(Size, alignof(CoroutineBodyStmt));
92   return new (Mem) CoroutineBodyStmt(Args);
93 }
94 
95 CoroutineBodyStmt *CoroutineBodyStmt::Create(const ASTContext &C, EmptyShell,
96                                              unsigned NumParams) {
97   std::size_t Size = totalSizeToAlloc<Stmt *>(
98       CoroutineBodyStmt::FirstParamMove + NumParams);
99 
100   void *Mem = C.Allocate(Size, alignof(CoroutineBodyStmt));
101   auto *Result = new (Mem) CoroutineBodyStmt(CtorArgs());
102   Result->NumParams = NumParams;
103   auto *ParamBegin = Result->getStoredStmts() + SubStmt::FirstParamMove;
104   std::uninitialized_fill(ParamBegin, ParamBegin + NumParams,
105                           static_cast<Stmt *>(nullptr));
106   return Result;
107 }
108 
109 CoroutineBodyStmt::CoroutineBodyStmt(CoroutineBodyStmt::CtorArgs const &Args)
110     : Stmt(CoroutineBodyStmtClass), NumParams(Args.ParamMoves.size()) {
111   Stmt **SubStmts = getStoredStmts();
112   SubStmts[CoroutineBodyStmt::Body] = Args.Body;
113   SubStmts[CoroutineBodyStmt::Promise] = Args.Promise;
114   SubStmts[CoroutineBodyStmt::InitSuspend] = Args.InitialSuspend;
115   SubStmts[CoroutineBodyStmt::FinalSuspend] = Args.FinalSuspend;
116   SubStmts[CoroutineBodyStmt::OnException] = Args.OnException;
117   SubStmts[CoroutineBodyStmt::OnFallthrough] = Args.OnFallthrough;
118   SubStmts[CoroutineBodyStmt::Allocate] = Args.Allocate;
119   SubStmts[CoroutineBodyStmt::Deallocate] = Args.Deallocate;
120   SubStmts[CoroutineBodyStmt::ReturnValue] = Args.ReturnValue;
121   SubStmts[CoroutineBodyStmt::ResultDecl] = Args.ResultDecl;
122   SubStmts[CoroutineBodyStmt::ReturnStmt] = Args.ReturnStmt;
123   SubStmts[CoroutineBodyStmt::ReturnStmtOnAllocFailure] =
124       Args.ReturnStmtOnAllocFailure;
125   std::copy(Args.ParamMoves.begin(), Args.ParamMoves.end(),
126             const_cast<Stmt **>(getParamMoves().data()));
127 }
128