// This file is part of PUMA.
// Copyright (C) 1999-2003  The PUMA developer team.
//
// This program is free software;  you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA  02111-1307  USA

#ifndef __ext_gnu_csemexpr_ah__
#define __ext_gnu_csemexpr_ah__

#include "Puma/GnuCTree.h"
#include "Puma/CLabelInfo.h"
#include "Puma/CLocalScope.h"

namespace Puma {

class CTypeInfo;

// gnu statement expression extension

// C semantic extension
slice class ExtGnuStmtExprsCSemExpr {
public:
  Puma::CTypeInfo *resolve (Puma::CT_GnuStatementExpr *, Puma::CTree *);
  Puma::CTypeInfo *resolveLabelAddr (Puma::CT_UnaryExpr *);
};

// C++ semantic extension
slice class ExtGnuStmtExprsCCSemExpr {
public:
  Puma::CTypeInfo *resolve (Puma::CT_GnuStatementExpr *, Puma::CTree *);
  Puma::CTypeInfo *resolveLabelAddr (Puma::CT_UnaryExpr *);
};

// gnu conditional expressions with two operands
slice class ExtGnuCondExprCSemExpr {
public:
  Puma::CTypeInfo *resolve_gnu (Puma::CT_IfThenExpr *, Puma::CTree *);
};

} // namespace Puma

slice Puma::CTypeInfo *Puma::ExtGnuStmtExprsCSemExpr::resolve (
  Puma::CT_GnuStatementExpr *node, Puma::CTree *) {

  Puma::CTypeInfo *result = &Puma::CTYPE_UNDEFINED;

  if (! current_scope->LocalScope ()) {
    SEM_ERROR (node,
               "braced-group within expression allowed only inside a function");
  } else {

    // first analyse the compound statement in this expression
    Puma::CSemVisitor csv (err);
    csv.run (node->Son (1), current_scope);

    // check the compound statement semantically
    Puma::CT_CmpdStmt *cmpd = node->CmpdStmt ();
    if (cmpd->Entries () >= 1 &&
        cmpd->Entry (cmpd->Entries () - 1)->NodeName () ==
        Puma::CT_ExprStmt::NodeId ()) {
      Puma::CT_ExprStmt *expr_stmt = (Puma::CT_ExprStmt*)cmpd->Entry (cmpd->Entries () - 1);
      result = expr_stmt->Expr ()->Type ();
    }
    else
      // an empty statement expression or one that does not end with a
      // statement expression has type void!
      result = &Puma::CTYPE_VOID;
  }

  node->setTypeRef (result);
  return result;
}

slice Puma::CTypeInfo *Puma::ExtGnuStmtExprsCSemExpr::resolveLabelAddr (
    CT_UnaryExpr *expr) {
  Puma::CFunctionInfo *finfo = current_scope->LocalScope ()->Function ();
  if (finfo) {
    Puma::CT_SimpleName *label = (Puma::CT_SimpleName*) expr->Son (1);
    Puma::CObjectInfo *linfo = finfo->Label (label->Text ());
    if (! linfo) {
      SEM_ERROR (label, "label `" << label->Text () << "' used but not defined");
    } else {
      label->Object (linfo);
      label->setTypeRef (linfo->TypeInfo ());
    }
  }
  Puma::CTypeInfo *type = new Puma::CTypePointer (&Puma::CTYPE_VOID);
  expr->setType (type);
  return type;
}

slice Puma::CTypeInfo *Puma::ExtGnuStmtExprsCCSemExpr::resolve (
  Puma::CT_GnuStatementExpr *node, Puma::CTree *) {

  Puma::CTypeInfo *result = &Puma::CTYPE_UNDEFINED;

  if (! current_scope->LocalScope ()) {
    SEM_ERROR (node,
               "braced-group within expression allowed only inside a function");
  } else {

    // first analyse the compound statement in this expression
    Puma::CCSemVisitor csv (err);
    csv.run (node->Son (1), current_scope);

    // check the compound statement semantically
    Puma::CT_CmpdStmt *cmpd = node->CmpdStmt ();
    if (cmpd->Entries () >= 1 &&
        cmpd->Entry (cmpd->Entries () - 1)->NodeName () ==
        Puma::CT_ExprStmt::NodeId ()) {
      Puma::CT_ExprStmt *expr_stmt = (Puma::CT_ExprStmt*)cmpd->Entry (cmpd->Entries () - 1);
      result = expr_stmt->Expr ()->Type ();
    }
    else
      // an empty statement expression or one that does not end with a
      // statement expression has type void!
      result = &Puma::CTYPE_VOID;
  }

  node->setTypeRef (result);
  return result;
}

slice Puma::CTypeInfo *Puma::ExtGnuStmtExprsCCSemExpr::resolveLabelAddr (
    CT_UnaryExpr *expr) {
  Puma::CFunctionInfo *finfo = current_scope->LocalScope ()->Function ();
  if (finfo) {
    Puma::CT_SimpleName *label = (Puma::CT_SimpleName*) expr->Son (1);
    Puma::CObjectInfo *linfo = finfo->Label (label->Text ());
    if (! linfo) {
      SEM_ERROR (label, "label `" << label->Text () << "' used but not defined");
    } else {
      label->Object (linfo);
      label->setTypeRef (linfo->TypeInfo ());
    }
  }
  Puma::CTypeInfo *type = new Puma::CTypePointer (&Puma::CTYPE_VOID);
  expr->setType (type);
  return type;
}

slice Puma::CTypeInfo *Puma::ExtGnuCondExprCSemExpr::resolve_gnu (CT_IfThenExpr *node, CTree *base) {
  CTypeInfo *result, *t1, *t2, *t3;
  CTree *op1, *op2, *op3;
  CConstant *v1;

  conv_to_ptr = 1;

  // resolve operands
  t1 = resolveExpr (node->Condition (), node);
  t2 = t1;
  t3 = resolveExpr (node->RightOperand (), node);
  op1 = node->Condition ();
  op2 = op1;
  op3 = node->RightOperand ();

  // determine the result type
  result = cond_expr_type (node, t1, op1, t2, op2, t3, op3);

  // apply arithmetic conversions if needed
  if (t2->isArithmetic () && t3->isArithmetic ()) {
    if (*t2 > *t3) {
      result = cast_to (t2, op3, node);
      op3 = node->RightOperand ();
    } else if (*t2 < *t3) {
      result = t3;
    } else
      result = t2;
  }

  // handle constants
  v1 = op1->Value () ? op1->Value ()->Constant () : 0;
  if (v1) {
    if (v1->isNull ()) {
      if (op3->Value ())
        node->setValueRef (op3->Value ());
    } else {
      if (op2->Value ())
        node->setValue (op2->Value ()->Constant ()->cast_to (t2));
    }
  }

  if (!result || result == t2 || result == t3 || *result == CTYPE_UNDEFINED)
    node->setTypeRef (result);
  else
    node->setType (result);
  return result;
}


#endif /* __ext_gnu_csemexpr_ah__ */