//===--- StmtCXX.cpp - Classes for representing C++ statements ------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the subclesses of Stmt class declared in StmtCXX.h
//
//===----------------------------------------------------------------------===//

#include "clang/AST/StmtCXX.h"

#include "clang/AST/ASTContext.h"

using namespace clang;

QualType CXXCatchStmt::getCaughtType() const {
  if (ExceptionDecl)
    return ExceptionDecl->getType();
  return QualType();
}

CXXTryStmt *CXXTryStmt::Create(const ASTContext &C, SourceLocation tryLoc,
                               Stmt *tryBlock, ArrayRef<Stmt *> handlers) {
  std::size_t Size = sizeof(CXXTryStmt);
  Size += ((handlers.size() + 1) * sizeof(Stmt *));

  void *Mem = C.Allocate(Size, alignof(CXXTryStmt));
  return new (Mem) CXXTryStmt(tryLoc, tryBlock, handlers);
}

CXXTryStmt *CXXTryStmt::Create(const ASTContext &C, EmptyShell Empty,
                               unsigned numHandlers) {
  std::size_t Size = sizeof(CXXTryStmt);
  Size += ((numHandlers + 1) * sizeof(Stmt *));

  void *Mem = C.Allocate(Size, alignof(CXXTryStmt));
  return new (Mem) CXXTryStmt(Empty, numHandlers);
}

CXXTryStmt::CXXTryStmt(SourceLocation tryLoc, Stmt *tryBlock,
                       ArrayRef<Stmt *> handlers)
    : Stmt(CXXTryStmtClass), TryLoc(tryLoc), NumHandlers(handlers.size()) {
  Stmt **Stmts = reinterpret_cast<Stmt **>(this + 1);
  Stmts[0] = tryBlock;
  std::copy(handlers.begin(), handlers.end(), Stmts + 1);
}

CXXForRangeStmt::CXXForRangeStmt(DeclStmt *Range,
                                 DeclStmt *BeginStmt, DeclStmt *EndStmt,
                                 Expr *Cond, Expr *Inc, DeclStmt *LoopVar,
                                 Stmt *Body, SourceLocation FL,
                                 SourceLocation CAL, SourceLocation CL,
                                 SourceLocation RPL)
    : Stmt(CXXForRangeStmtClass), ForLoc(FL), CoawaitLoc(CAL), ColonLoc(CL),
      RParenLoc(RPL) {
  SubExprs[RANGE] = Range;
  SubExprs[BEGINSTMT] = BeginStmt;
  SubExprs[ENDSTMT] = EndStmt;
  SubExprs[COND] = Cond;
  SubExprs[INC] = Inc;
  SubExprs[LOOPVAR] = LoopVar;
  SubExprs[BODY] = Body;
}

Expr *CXXForRangeStmt::getRangeInit() {
  DeclStmt *RangeStmt = getRangeStmt();
  VarDecl *RangeDecl = dyn_cast_or_null<VarDecl>(RangeStmt->getSingleDecl());
  assert(RangeDecl && "for-range should have a single var decl");
  return RangeDecl->getInit();
}

const Expr *CXXForRangeStmt::getRangeInit() const {
  return const_cast<CXXForRangeStmt *>(this)->getRangeInit();
}

VarDecl *CXXForRangeStmt::getLoopVariable() {
  Decl *LV = cast<DeclStmt>(getLoopVarStmt())->getSingleDecl();
  assert(LV && "No loop variable in CXXForRangeStmt");
  return cast<VarDecl>(LV);
}

const VarDecl *CXXForRangeStmt::getLoopVariable() const {
  return const_cast<CXXForRangeStmt *>(this)->getLoopVariable();
}

CoroutineBodyStmt *CoroutineBodyStmt::Create(
    const ASTContext &C, CoroutineBodyStmt::CtorArgs const &Args) {
  std::size_t Size = totalSizeToAlloc<Stmt *>(
      CoroutineBodyStmt::FirstParamMove + Args.ParamMoves.size());

  void *Mem = C.Allocate(Size, alignof(CoroutineBodyStmt));
  return new (Mem) CoroutineBodyStmt(Args);
}

CoroutineBodyStmt *CoroutineBodyStmt::Create(const ASTContext &C, EmptyShell,
                                             unsigned NumParams) {
  std::size_t Size = totalSizeToAlloc<Stmt *>(
      CoroutineBodyStmt::FirstParamMove + NumParams);

  void *Mem = C.Allocate(Size, alignof(CoroutineBodyStmt));
  auto *Result = new (Mem) CoroutineBodyStmt(CtorArgs());
  Result->NumParams = NumParams;
  auto *ParamBegin = Result->getStoredStmts() + SubStmt::FirstParamMove;
  std::uninitialized_fill(ParamBegin, ParamBegin + NumParams,
                          static_cast<Stmt *>(nullptr));
  return Result;
}

CoroutineBodyStmt::CoroutineBodyStmt(CoroutineBodyStmt::CtorArgs const &Args)
    : Stmt(CoroutineBodyStmtClass), NumParams(Args.ParamMoves.size()) {
  Stmt **SubStmts = getStoredStmts();
  SubStmts[CoroutineBodyStmt::Body] = Args.Body;
  SubStmts[CoroutineBodyStmt::Promise] = Args.Promise;
  SubStmts[CoroutineBodyStmt::InitSuspend] = Args.InitialSuspend;
  SubStmts[CoroutineBodyStmt::FinalSuspend] = Args.FinalSuspend;
  SubStmts[CoroutineBodyStmt::OnException] = Args.OnException;
  SubStmts[CoroutineBodyStmt::OnFallthrough] = Args.OnFallthrough;
  SubStmts[CoroutineBodyStmt::Allocate] = Args.Allocate;
  SubStmts[CoroutineBodyStmt::Deallocate] = Args.Deallocate;
  SubStmts[CoroutineBodyStmt::ReturnValue] = Args.ReturnValue;
  SubStmts[CoroutineBodyStmt::ResultDecl] = Args.ResultDecl;
  SubStmts[CoroutineBodyStmt::ReturnStmt] = Args.ReturnStmt;
  SubStmts[CoroutineBodyStmt::ReturnStmtOnAllocFailure] =
      Args.ReturnStmtOnAllocFailure;
  std::copy(Args.ParamMoves.begin(), Args.ParamMoves.end(),
            const_cast<Stmt **>(getParamMoves().data()));
}