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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- E X P _ A T A G --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2006-2016, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 with Atree; use Atree;
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27 with Einfo; use Einfo;
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28 with Elists; use Elists;
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29 with Exp_Disp; use Exp_Disp;
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30 with Exp_Util; use Exp_Util;
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31 with Namet; use Namet;
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32 with Nlists; use Nlists;
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33 with Nmake; use Nmake;
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34 with Opt; use Opt;
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35 with Rtsfind; use Rtsfind;
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36 with Sinfo; use Sinfo;
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37 with Sem_Aux; use Sem_Aux;
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38 with Sem_Disp; use Sem_Disp;
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39 with Sem_Util; use Sem_Util;
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40 with Stand; use Stand;
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41 with Snames; use Snames;
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42 with Tbuild; use Tbuild;
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43
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44 package body Exp_Atag is
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45
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46 -----------------------
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47 -- Local Subprograms --
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48 -----------------------
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49
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50 function Build_DT
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51 (Loc : Source_Ptr;
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52 Tag_Node : Node_Id) return Node_Id;
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53 -- Build code that displaces the Tag to reference the base of the wrapper
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54 -- record
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55 --
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56 -- Generates:
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57 -- To_Dispatch_Table_Ptr
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58 -- (To_Address (Tag_Node) - Tag_Node.Prims_Ptr'Position);
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59
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60 function Build_TSD
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61 (Loc : Source_Ptr;
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62 Tag_Node_Addr : Node_Id) return Node_Id;
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63 -- Build code that retrieves the address of the record containing the Type
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64 -- Specific Data generated by GNAT.
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65 --
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66 -- Generate: To_Type_Specific_Data_Ptr
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67 -- (To_Addr_Ptr (Tag_Node_Addr - Typeinfo_Offset).all);
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68
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69 ------------------------------------------------
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70 -- Build_Common_Dispatching_Select_Statements --
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71 ------------------------------------------------
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72
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73 procedure Build_Common_Dispatching_Select_Statements
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74 (Typ : Entity_Id;
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75 Stmts : List_Id)
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76 is
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77 Loc : constant Source_Ptr := Sloc (Typ);
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78 Tag_Node : Node_Id;
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79
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80 begin
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81 -- Generate:
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82 -- C := get_prim_op_kind (tag! (<type>VP), S);
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83
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84 -- where C is the out parameter capturing the call kind and S is the
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85 -- dispatch table slot number.
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86
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87 if Tagged_Type_Expansion then
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88 Tag_Node :=
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89 Unchecked_Convert_To (RTE (RE_Tag),
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90 New_Occurrence_Of
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91 (Node (First_Elmt (Access_Disp_Table (Typ))), Loc));
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92
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93 else
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94 Tag_Node :=
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95 Make_Attribute_Reference (Loc,
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96 Prefix => New_Occurrence_Of (Typ, Loc),
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97 Attribute_Name => Name_Tag);
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98 end if;
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99
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100 Append_To (Stmts,
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101 Make_Assignment_Statement (Loc,
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102 Name => Make_Identifier (Loc, Name_uC),
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103 Expression =>
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104 Make_Function_Call (Loc,
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105 Name =>
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106 New_Occurrence_Of (RTE (RE_Get_Prim_Op_Kind), Loc),
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107 Parameter_Associations => New_List (
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108 Tag_Node,
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109 Make_Identifier (Loc, Name_uS)))));
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110
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111 -- Generate:
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112
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113 -- if C = POK_Procedure
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114 -- or else C = POK_Protected_Procedure
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115 -- or else C = POK_Task_Procedure;
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116 -- then
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117 -- F := True;
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118 -- return;
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119
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120 -- where F is the out parameter capturing the status of a potential
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121 -- entry call.
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122
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123 Append_To (Stmts,
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124 Make_If_Statement (Loc,
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125
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126 Condition =>
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127 Make_Or_Else (Loc,
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128 Left_Opnd =>
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129 Make_Op_Eq (Loc,
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130 Left_Opnd => Make_Identifier (Loc, Name_uC),
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131 Right_Opnd =>
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132 New_Occurrence_Of (RTE (RE_POK_Procedure), Loc)),
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133 Right_Opnd =>
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134 Make_Or_Else (Loc,
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135 Left_Opnd =>
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136 Make_Op_Eq (Loc,
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137 Left_Opnd => Make_Identifier (Loc, Name_uC),
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138 Right_Opnd =>
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139 New_Occurrence_Of
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140 (RTE (RE_POK_Protected_Procedure), Loc)),
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141 Right_Opnd =>
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142 Make_Op_Eq (Loc,
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143 Left_Opnd => Make_Identifier (Loc, Name_uC),
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144 Right_Opnd =>
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145 New_Occurrence_Of
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146 (RTE (RE_POK_Task_Procedure), Loc)))),
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147
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148 Then_Statements =>
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149 New_List (
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150 Make_Assignment_Statement (Loc,
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151 Name => Make_Identifier (Loc, Name_uF),
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152 Expression => New_Occurrence_Of (Standard_True, Loc)),
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153 Make_Simple_Return_Statement (Loc))));
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154 end Build_Common_Dispatching_Select_Statements;
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155
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156 -------------------------
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157 -- Build_CW_Membership --
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158 -------------------------
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159
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160 procedure Build_CW_Membership
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161 (Loc : Source_Ptr;
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162 Obj_Tag_Node : in out Node_Id;
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163 Typ_Tag_Node : Node_Id;
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164 Related_Nod : Node_Id;
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165 New_Node : out Node_Id)
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166 is
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167 Tag_Addr : constant Entity_Id := Make_Temporary (Loc, 'D', Obj_Tag_Node);
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168 Obj_TSD : constant Entity_Id := Make_Temporary (Loc, 'D');
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169 Typ_TSD : constant Entity_Id := Make_Temporary (Loc, 'D');
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170 Index : constant Entity_Id := Make_Temporary (Loc, 'D');
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171
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172 begin
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173 -- Generate:
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174
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175 -- Tag_Addr : constant Tag := Address!(Obj_Tag);
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176 -- Obj_TSD : constant Type_Specific_Data_Ptr
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177 -- := Build_TSD (Tag_Addr);
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178 -- Typ_TSD : constant Type_Specific_Data_Ptr
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179 -- := Build_TSD (Address!(Typ_Tag));
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180 -- Index : constant Integer := Obj_TSD.Idepth - Typ_TSD.Idepth
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181 -- Index >= 0 and then Obj_TSD.Tags_Table (Index) = Typ'Tag
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182
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183 Insert_Action (Related_Nod,
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184 Make_Object_Declaration (Loc,
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185 Defining_Identifier => Tag_Addr,
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186 Constant_Present => True,
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187 Object_Definition => New_Occurrence_Of (RTE (RE_Address), Loc),
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188 Expression => Unchecked_Convert_To
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189 (RTE (RE_Address), Obj_Tag_Node)));
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190
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191 -- Unchecked_Convert_To relocates Obj_Tag_Node and therefore we must
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192 -- update it.
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193
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194 Obj_Tag_Node := Expression (Expression (Parent (Tag_Addr)));
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195
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196 Insert_Action (Related_Nod,
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197 Make_Object_Declaration (Loc,
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198 Defining_Identifier => Obj_TSD,
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199 Constant_Present => True,
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200 Object_Definition =>
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201 New_Occurrence_Of (RTE (RE_Type_Specific_Data_Ptr), Loc),
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202 Expression =>
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203 Build_TSD (Loc, New_Occurrence_Of (Tag_Addr, Loc))),
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204 Suppress => All_Checks);
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205
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206 Insert_Action (Related_Nod,
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207 Make_Object_Declaration (Loc,
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208 Defining_Identifier => Typ_TSD,
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209 Constant_Present => True,
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210 Object_Definition =>
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211 New_Occurrence_Of (RTE (RE_Type_Specific_Data_Ptr), Loc),
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212 Expression =>
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213 Build_TSD (Loc,
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214 Unchecked_Convert_To (RTE (RE_Address), Typ_Tag_Node))),
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215 Suppress => All_Checks);
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216
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217 Insert_Action (Related_Nod,
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218 Make_Object_Declaration (Loc,
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219 Defining_Identifier => Index,
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220 Constant_Present => True,
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221 Object_Definition => New_Occurrence_Of (Standard_Integer, Loc),
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222 Expression =>
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223 Make_Op_Subtract (Loc,
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224 Left_Opnd =>
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225 Make_Selected_Component (Loc,
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226 Prefix => New_Occurrence_Of (Obj_TSD, Loc),
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227 Selector_Name =>
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228 New_Occurrence_Of
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229 (RTE_Record_Component (RE_Idepth), Loc)),
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230
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231 Right_Opnd =>
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232 Make_Selected_Component (Loc,
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233 Prefix => New_Occurrence_Of (Typ_TSD, Loc),
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234 Selector_Name =>
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235 New_Occurrence_Of
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236 (RTE_Record_Component (RE_Idepth), Loc)))),
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237 Suppress => All_Checks);
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238
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239 New_Node :=
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240 Make_And_Then (Loc,
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241 Left_Opnd =>
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242 Make_Op_Ge (Loc,
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243 Left_Opnd => New_Occurrence_Of (Index, Loc),
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244 Right_Opnd => Make_Integer_Literal (Loc, Uint_0)),
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245
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246 Right_Opnd =>
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247 Make_Op_Eq (Loc,
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248 Left_Opnd =>
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249 Make_Indexed_Component (Loc,
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250 Prefix =>
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251 Make_Selected_Component (Loc,
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252 Prefix => New_Occurrence_Of (Obj_TSD, Loc),
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253 Selector_Name =>
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254 New_Occurrence_Of
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255 (RTE_Record_Component (RE_Tags_Table), Loc)),
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256 Expressions =>
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257 New_List (New_Occurrence_Of (Index, Loc))),
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258
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259 Right_Opnd => Typ_Tag_Node));
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260 end Build_CW_Membership;
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261
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262 --------------
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263 -- Build_DT --
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264 --------------
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265
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266 function Build_DT
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267 (Loc : Source_Ptr;
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268 Tag_Node : Node_Id) return Node_Id
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269 is
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270 begin
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271 return
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272 Make_Function_Call (Loc,
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273 Name => New_Occurrence_Of (RTE (RE_DT), Loc),
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274 Parameter_Associations => New_List (
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275 Unchecked_Convert_To (RTE (RE_Tag), Tag_Node)));
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276 end Build_DT;
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277
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278 ----------------------------
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279 -- Build_Get_Access_Level --
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280 ----------------------------
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281
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282 function Build_Get_Access_Level
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283 (Loc : Source_Ptr;
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284 Tag_Node : Node_Id) return Node_Id
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285 is
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286 begin
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287 return
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288 Make_Selected_Component (Loc,
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289 Prefix =>
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290 Build_TSD (Loc,
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291 Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
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292 Selector_Name =>
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293 New_Occurrence_Of
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294 (RTE_Record_Component (RE_Access_Level), Loc));
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295 end Build_Get_Access_Level;
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296
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297 -------------------------
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298 -- Build_Get_Alignment --
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299 -------------------------
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300
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301 function Build_Get_Alignment
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302 (Loc : Source_Ptr;
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303 Tag_Node : Node_Id) return Node_Id
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304 is
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305 begin
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306 return
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307 Make_Selected_Component (Loc,
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308 Prefix =>
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309 Build_TSD (Loc, Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
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310 Selector_Name =>
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311 New_Occurrence_Of (RTE_Record_Component (RE_Alignment), Loc));
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312 end Build_Get_Alignment;
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313
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314 ------------------------------------------
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315 -- Build_Get_Predefined_Prim_Op_Address --
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316 ------------------------------------------
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317
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318 procedure Build_Get_Predefined_Prim_Op_Address
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319 (Loc : Source_Ptr;
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320 Position : Uint;
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321 Tag_Node : in out Node_Id;
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322 New_Node : out Node_Id)
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323 is
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324 Ctrl_Tag : Node_Id;
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325
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326 begin
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327 Ctrl_Tag := Unchecked_Convert_To (RTE (RE_Address), Tag_Node);
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328
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329 -- Unchecked_Convert_To relocates the controlling tag node and therefore
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330 -- we must update it.
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331
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332 Tag_Node := Expression (Ctrl_Tag);
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333
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334 -- Build code that retrieves the address of the dispatch table
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335 -- containing the predefined Ada primitives:
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336 --
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337 -- Generate:
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338 -- To_Predef_Prims_Table_Ptr
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339 -- (To_Addr_Ptr (To_Address (Tag) - Predef_Prims_Offset).all);
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340
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341 New_Node :=
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342 Make_Indexed_Component (Loc,
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343 Prefix =>
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344 Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
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345 Make_Explicit_Dereference (Loc,
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346 Unchecked_Convert_To (RTE (RE_Addr_Ptr),
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347 Make_Function_Call (Loc,
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348 Name =>
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349 Make_Expanded_Name (Loc,
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350 Chars => Name_Op_Subtract,
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351 Prefix =>
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352 New_Occurrence_Of
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353 (RTU_Entity (System_Storage_Elements), Loc),
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354 Selector_Name =>
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355 Make_Identifier (Loc, Name_Op_Subtract)),
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356 Parameter_Associations => New_List (
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357 Ctrl_Tag,
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358 New_Occurrence_Of
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359 (RTE (RE_DT_Predef_Prims_Offset), Loc)))))),
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360 Expressions =>
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361 New_List (Make_Integer_Literal (Loc, Position)));
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362 end Build_Get_Predefined_Prim_Op_Address;
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363
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364 -----------------------------
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365 -- Build_Inherit_CPP_Prims --
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366 -----------------------------
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367
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368 function Build_Inherit_CPP_Prims (Typ : Entity_Id) return List_Id is
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369 Loc : constant Source_Ptr := Sloc (Typ);
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370 CPP_Nb_Prims : constant Nat := CPP_Num_Prims (Typ);
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371 CPP_Table : array (1 .. CPP_Nb_Prims) of Boolean := (others => False);
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372 CPP_Typ : constant Entity_Id := Enclosing_CPP_Parent (Typ);
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373 Result : constant List_Id := New_List;
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374 Parent_Typ : constant Entity_Id := Etype (Typ);
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375 E : Entity_Id;
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376 Elmt : Elmt_Id;
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377 Parent_Tag : Entity_Id;
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378 Prim : Entity_Id;
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379 Prim_Pos : Nat;
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380 Typ_Tag : Entity_Id;
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381
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382 begin
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383 pragma Assert (not Is_CPP_Class (Typ));
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384
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385 -- No code needed if this type has no primitives inherited from C++
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386
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387 if CPP_Nb_Prims = 0 then
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388 return Result;
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389 end if;
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390
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391 -- Stage 1: Inherit and override C++ slots of the primary dispatch table
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392
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393 -- Generate:
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394 -- Typ'Tag (Prim_Pos) := Prim'Unrestricted_Access;
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395
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396 Parent_Tag := Node (First_Elmt (Access_Disp_Table (Parent_Typ)));
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397 Typ_Tag := Node (First_Elmt (Access_Disp_Table (Typ)));
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398
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399 Elmt := First_Elmt (Primitive_Operations (Typ));
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400 while Present (Elmt) loop
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401 Prim := Node (Elmt);
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402 E := Ultimate_Alias (Prim);
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403 Prim_Pos := UI_To_Int (DT_Position (E));
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404
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405 -- Skip predefined, abstract, and eliminated primitives. Skip also
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406 -- primitives not located in the C++ part of the dispatch table.
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407
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408 if not Is_Predefined_Dispatching_Operation (Prim)
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409 and then not Is_Predefined_Dispatching_Operation (E)
|
|
|
410 and then not Present (Interface_Alias (Prim))
|
|
|
411 and then not Is_Abstract_Subprogram (E)
|
|
|
412 and then not Is_Eliminated (E)
|
|
|
413 and then Prim_Pos <= CPP_Nb_Prims
|
|
|
414 and then Find_Dispatching_Type (E) = Typ
|
|
|
415 then
|
|
|
416 -- Remember that this slot is used
|
|
|
417
|
|
|
418 pragma Assert (CPP_Table (Prim_Pos) = False);
|
|
|
419 CPP_Table (Prim_Pos) := True;
|
|
|
420
|
|
|
421 Append_To (Result,
|
|
|
422 Make_Assignment_Statement (Loc,
|
|
|
423 Name =>
|
|
|
424 Make_Indexed_Component (Loc,
|
|
|
425 Prefix =>
|
|
|
426 Make_Explicit_Dereference (Loc,
|
|
|
427 Unchecked_Convert_To
|
|
|
428 (Node (Last_Elmt (Access_Disp_Table (Typ))),
|
|
|
429 New_Occurrence_Of (Typ_Tag, Loc))),
|
|
|
430 Expressions =>
|
|
|
431 New_List (Make_Integer_Literal (Loc, Prim_Pos))),
|
|
|
432
|
|
|
433 Expression =>
|
|
|
434 Unchecked_Convert_To (RTE (RE_Prim_Ptr),
|
|
|
435 Make_Attribute_Reference (Loc,
|
|
|
436 Prefix => New_Occurrence_Of (E, Loc),
|
|
|
437 Attribute_Name => Name_Unrestricted_Access))));
|
|
|
438 end if;
|
|
|
439
|
|
|
440 Next_Elmt (Elmt);
|
|
|
441 end loop;
|
|
|
442
|
|
|
443 -- If all primitives have been overridden then there is no need to copy
|
|
|
444 -- from Typ's parent its dispatch table. Otherwise, if some primitive is
|
|
|
445 -- inherited from the parent we copy only the C++ part of the dispatch
|
|
|
446 -- table from the parent before the assignments that initialize the
|
|
|
447 -- overridden primitives.
|
|
|
448
|
|
|
449 -- Generate:
|
|
|
450
|
|
|
451 -- type CPP_TypG is array (1 .. CPP_Nb_Prims) ofd Prim_Ptr;
|
|
|
452 -- type CPP_TypH is access CPP_TypG;
|
|
|
453 -- CPP_TypG!(Typ_Tag).all := CPP_TypG!(Parent_Tag).all;
|
|
|
454
|
|
|
455 -- Note: There is no need to duplicate the declarations of CPP_TypG and
|
|
|
456 -- CPP_TypH because, for expansion of dispatching calls, these
|
|
|
457 -- entities are stored in the last elements of Access_Disp_Table.
|
|
|
458
|
|
|
459 for J in CPP_Table'Range loop
|
|
|
460 if not CPP_Table (J) then
|
|
|
461 Prepend_To (Result,
|
|
|
462 Make_Assignment_Statement (Loc,
|
|
|
463 Name =>
|
|
|
464 Make_Explicit_Dereference (Loc,
|
|
|
465 Unchecked_Convert_To
|
|
|
466 (Node (Last_Elmt (Access_Disp_Table (CPP_Typ))),
|
|
|
467 New_Occurrence_Of (Typ_Tag, Loc))),
|
|
|
468 Expression =>
|
|
|
469 Make_Explicit_Dereference (Loc,
|
|
|
470 Unchecked_Convert_To
|
|
|
471 (Node (Last_Elmt (Access_Disp_Table (CPP_Typ))),
|
|
|
472 New_Occurrence_Of (Parent_Tag, Loc)))));
|
|
|
473 exit;
|
|
|
474 end if;
|
|
|
475 end loop;
|
|
|
476
|
|
|
477 -- Stage 2: Inherit and override C++ slots of secondary dispatch tables
|
|
|
478
|
|
|
479 declare
|
|
|
480 Iface : Entity_Id;
|
|
|
481 Iface_Nb_Prims : Nat;
|
|
|
482 Parent_Ifaces_List : Elist_Id;
|
|
|
483 Parent_Ifaces_Comp_List : Elist_Id;
|
|
|
484 Parent_Ifaces_Tag_List : Elist_Id;
|
|
|
485 Parent_Iface_Tag_Elmt : Elmt_Id;
|
|
|
486 Typ_Ifaces_List : Elist_Id;
|
|
|
487 Typ_Ifaces_Comp_List : Elist_Id;
|
|
|
488 Typ_Ifaces_Tag_List : Elist_Id;
|
|
|
489 Typ_Iface_Tag_Elmt : Elmt_Id;
|
|
|
490
|
|
|
491 begin
|
|
|
492 Collect_Interfaces_Info
|
|
|
493 (T => Parent_Typ,
|
|
|
494 Ifaces_List => Parent_Ifaces_List,
|
|
|
495 Components_List => Parent_Ifaces_Comp_List,
|
|
|
496 Tags_List => Parent_Ifaces_Tag_List);
|
|
|
497
|
|
|
498 Collect_Interfaces_Info
|
|
|
499 (T => Typ,
|
|
|
500 Ifaces_List => Typ_Ifaces_List,
|
|
|
501 Components_List => Typ_Ifaces_Comp_List,
|
|
|
502 Tags_List => Typ_Ifaces_Tag_List);
|
|
|
503
|
|
|
504 Parent_Iface_Tag_Elmt := First_Elmt (Parent_Ifaces_Tag_List);
|
|
|
505 Typ_Iface_Tag_Elmt := First_Elmt (Typ_Ifaces_Tag_List);
|
|
|
506 while Present (Parent_Iface_Tag_Elmt) loop
|
|
|
507 Parent_Tag := Node (Parent_Iface_Tag_Elmt);
|
|
|
508 Typ_Tag := Node (Typ_Iface_Tag_Elmt);
|
|
|
509
|
|
|
510 pragma Assert
|
|
|
511 (Related_Type (Parent_Tag) = Related_Type (Typ_Tag));
|
|
|
512 Iface := Related_Type (Parent_Tag);
|
|
|
513
|
|
|
514 Iface_Nb_Prims :=
|
|
|
515 UI_To_Int (DT_Entry_Count (First_Tag_Component (Iface)));
|
|
|
516
|
|
|
517 if Iface_Nb_Prims > 0 then
|
|
|
518
|
|
|
519 -- Update slots of overridden primitives
|
|
|
520
|
|
|
521 declare
|
|
|
522 Last_Nod : constant Node_Id := Last (Result);
|
|
|
523 Nb_Prims : constant Nat := UI_To_Int
|
|
|
524 (DT_Entry_Count
|
|
|
525 (First_Tag_Component (Iface)));
|
|
|
526 Elmt : Elmt_Id;
|
|
|
527 Prim : Entity_Id;
|
|
|
528 E : Entity_Id;
|
|
|
529 Prim_Pos : Nat;
|
|
|
530
|
|
|
531 Prims_Table : array (1 .. Nb_Prims) of Boolean;
|
|
|
532
|
|
|
533 begin
|
|
|
534 Prims_Table := (others => False);
|
|
|
535
|
|
|
536 Elmt := First_Elmt (Primitive_Operations (Typ));
|
|
|
537 while Present (Elmt) loop
|
|
|
538 Prim := Node (Elmt);
|
|
|
539 E := Ultimate_Alias (Prim);
|
|
|
540
|
|
|
541 if not Is_Predefined_Dispatching_Operation (Prim)
|
|
|
542 and then Present (Interface_Alias (Prim))
|
|
|
543 and then Find_Dispatching_Type (Interface_Alias (Prim))
|
|
|
544 = Iface
|
|
|
545 and then not Is_Abstract_Subprogram (E)
|
|
|
546 and then not Is_Eliminated (E)
|
|
|
547 and then Find_Dispatching_Type (E) = Typ
|
|
|
548 then
|
|
|
549 Prim_Pos := UI_To_Int (DT_Position (Prim));
|
|
|
550
|
|
|
551 -- Remember that this slot is already initialized
|
|
|
552
|
|
|
553 pragma Assert (Prims_Table (Prim_Pos) = False);
|
|
|
554 Prims_Table (Prim_Pos) := True;
|
|
|
555
|
|
|
556 Append_To (Result,
|
|
|
557 Make_Assignment_Statement (Loc,
|
|
|
558 Name =>
|
|
|
559 Make_Indexed_Component (Loc,
|
|
|
560 Prefix =>
|
|
|
561 Make_Explicit_Dereference (Loc,
|
|
|
562 Unchecked_Convert_To
|
|
|
563 (Node
|
|
|
564 (Last_Elmt
|
|
|
565 (Access_Disp_Table (Iface))),
|
|
|
566 New_Occurrence_Of (Typ_Tag, Loc))),
|
|
|
567 Expressions =>
|
|
|
568 New_List
|
|
|
569 (Make_Integer_Literal (Loc, Prim_Pos))),
|
|
|
570
|
|
|
571 Expression =>
|
|
|
572 Unchecked_Convert_To (RTE (RE_Prim_Ptr),
|
|
|
573 Make_Attribute_Reference (Loc,
|
|
|
574 Prefix => New_Occurrence_Of (E, Loc),
|
|
|
575 Attribute_Name =>
|
|
|
576 Name_Unrestricted_Access))));
|
|
|
577 end if;
|
|
|
578
|
|
|
579 Next_Elmt (Elmt);
|
|
|
580 end loop;
|
|
|
581
|
|
|
582 -- Check if all primitives from the parent have been
|
|
|
583 -- overridden (to avoid copying the whole secondary
|
|
|
584 -- table from the parent).
|
|
|
585
|
|
|
586 -- IfaceG!(Typ_Sec_Tag).all := IfaceG!(Parent_Sec_Tag).all;
|
|
|
587
|
|
|
588 for J in Prims_Table'Range loop
|
|
|
589 if not Prims_Table (J) then
|
|
|
590 Insert_After (Last_Nod,
|
|
|
591 Make_Assignment_Statement (Loc,
|
|
|
592 Name =>
|
|
|
593 Make_Explicit_Dereference (Loc,
|
|
|
594 Unchecked_Convert_To
|
|
|
595 (Node (Last_Elmt (Access_Disp_Table (Iface))),
|
|
|
596 New_Occurrence_Of (Typ_Tag, Loc))),
|
|
|
597 Expression =>
|
|
|
598 Make_Explicit_Dereference (Loc,
|
|
|
599 Unchecked_Convert_To
|
|
|
600 (Node (Last_Elmt (Access_Disp_Table (Iface))),
|
|
|
601 New_Occurrence_Of (Parent_Tag, Loc)))));
|
|
|
602 exit;
|
|
|
603 end if;
|
|
|
604 end loop;
|
|
|
605 end;
|
|
|
606 end if;
|
|
|
607
|
|
|
608 Next_Elmt (Typ_Iface_Tag_Elmt);
|
|
|
609 Next_Elmt (Parent_Iface_Tag_Elmt);
|
|
|
610 end loop;
|
|
|
611 end;
|
|
|
612
|
|
|
613 return Result;
|
|
|
614 end Build_Inherit_CPP_Prims;
|
|
|
615
|
|
|
616 -------------------------
|
|
|
617 -- Build_Inherit_Prims --
|
|
|
618 -------------------------
|
|
|
619
|
|
|
620 function Build_Inherit_Prims
|
|
|
621 (Loc : Source_Ptr;
|
|
|
622 Typ : Entity_Id;
|
|
|
623 Old_Tag_Node : Node_Id;
|
|
|
624 New_Tag_Node : Node_Id;
|
|
|
625 Num_Prims : Nat) return Node_Id
|
|
|
626 is
|
|
|
627 begin
|
|
|
628 if RTE_Available (RE_DT) then
|
|
|
629 return
|
|
|
630 Make_Assignment_Statement (Loc,
|
|
|
631 Name =>
|
|
|
632 Make_Slice (Loc,
|
|
|
633 Prefix =>
|
|
|
634 Make_Selected_Component (Loc,
|
|
|
635 Prefix =>
|
|
|
636 Build_DT (Loc, New_Tag_Node),
|
|
|
637 Selector_Name =>
|
|
|
638 New_Occurrence_Of
|
|
|
639 (RTE_Record_Component (RE_Prims_Ptr), Loc)),
|
|
|
640 Discrete_Range =>
|
|
|
641 Make_Range (Loc,
|
|
|
642 Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
|
643 High_Bound => Make_Integer_Literal (Loc, Num_Prims))),
|
|
|
644
|
|
|
645 Expression =>
|
|
|
646 Make_Slice (Loc,
|
|
|
647 Prefix =>
|
|
|
648 Make_Selected_Component (Loc,
|
|
|
649 Prefix =>
|
|
|
650 Build_DT (Loc, Old_Tag_Node),
|
|
|
651 Selector_Name =>
|
|
|
652 New_Occurrence_Of
|
|
|
653 (RTE_Record_Component (RE_Prims_Ptr), Loc)),
|
|
|
654 Discrete_Range =>
|
|
|
655 Make_Range (Loc,
|
|
|
656 Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
|
657 High_Bound => Make_Integer_Literal (Loc, Num_Prims))));
|
|
|
658 else
|
|
|
659 return
|
|
|
660 Make_Assignment_Statement (Loc,
|
|
|
661 Name =>
|
|
|
662 Make_Slice (Loc,
|
|
|
663 Prefix =>
|
|
|
664 Unchecked_Convert_To
|
|
|
665 (Node (Last_Elmt (Access_Disp_Table (Typ))),
|
|
|
666 New_Tag_Node),
|
|
|
667 Discrete_Range =>
|
|
|
668 Make_Range (Loc,
|
|
|
669 Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
|
670 High_Bound => Make_Integer_Literal (Loc, Num_Prims))),
|
|
|
671
|
|
|
672 Expression =>
|
|
|
673 Make_Slice (Loc,
|
|
|
674 Prefix =>
|
|
|
675 Unchecked_Convert_To
|
|
|
676 (Node (Last_Elmt (Access_Disp_Table (Typ))),
|
|
|
677 Old_Tag_Node),
|
|
|
678 Discrete_Range =>
|
|
|
679 Make_Range (Loc,
|
|
|
680 Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
|
681 High_Bound => Make_Integer_Literal (Loc, Num_Prims))));
|
|
|
682 end if;
|
|
|
683 end Build_Inherit_Prims;
|
|
|
684
|
|
|
685 -------------------------------
|
|
|
686 -- Build_Get_Prim_Op_Address --
|
|
|
687 -------------------------------
|
|
|
688
|
|
|
689 procedure Build_Get_Prim_Op_Address
|
|
|
690 (Loc : Source_Ptr;
|
|
|
691 Typ : Entity_Id;
|
|
|
692 Position : Uint;
|
|
|
693 Tag_Node : in out Node_Id;
|
|
|
694 New_Node : out Node_Id)
|
|
|
695 is
|
|
|
696 New_Prefix : Node_Id;
|
|
|
697
|
|
|
698 begin
|
|
|
699 pragma Assert
|
|
|
700 (Position <= DT_Entry_Count (First_Tag_Component (Typ)));
|
|
|
701
|
|
|
702 -- At the end of the Access_Disp_Table list we have the type
|
|
|
703 -- declaration required to convert the tag into a pointer to
|
|
|
704 -- the prims_ptr table (see Freeze_Record_Type).
|
|
|
705
|
|
|
706 New_Prefix :=
|
|
|
707 Unchecked_Convert_To
|
|
|
708 (Node (Last_Elmt (Access_Disp_Table (Typ))), Tag_Node);
|
|
|
709
|
|
|
710 -- Unchecked_Convert_To relocates the controlling tag node and therefore
|
|
|
711 -- we must update it.
|
|
|
712
|
|
|
713 Tag_Node := Expression (New_Prefix);
|
|
|
714
|
|
|
715 New_Node :=
|
|
|
716 Make_Indexed_Component (Loc,
|
|
|
717 Prefix => New_Prefix,
|
|
|
718 Expressions => New_List (Make_Integer_Literal (Loc, Position)));
|
|
|
719 end Build_Get_Prim_Op_Address;
|
|
|
720
|
|
|
721 -----------------------------
|
|
|
722 -- Build_Get_Transportable --
|
|
|
723 -----------------------------
|
|
|
724
|
|
|
725 function Build_Get_Transportable
|
|
|
726 (Loc : Source_Ptr;
|
|
|
727 Tag_Node : Node_Id) return Node_Id
|
|
|
728 is
|
|
|
729 begin
|
|
|
730 return
|
|
|
731 Make_Selected_Component (Loc,
|
|
|
732 Prefix =>
|
|
|
733 Build_TSD (Loc,
|
|
|
734 Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
|
|
|
735 Selector_Name =>
|
|
|
736 New_Occurrence_Of
|
|
|
737 (RTE_Record_Component (RE_Transportable), Loc));
|
|
|
738 end Build_Get_Transportable;
|
|
|
739
|
|
|
740 ------------------------------------
|
|
|
741 -- Build_Inherit_Predefined_Prims --
|
|
|
742 ------------------------------------
|
|
|
743
|
|
|
744 function Build_Inherit_Predefined_Prims
|
|
|
745 (Loc : Source_Ptr;
|
|
|
746 Old_Tag_Node : Node_Id;
|
|
|
747 New_Tag_Node : Node_Id) return Node_Id
|
|
|
748 is
|
|
|
749 begin
|
|
|
750 return
|
|
|
751 Make_Assignment_Statement (Loc,
|
|
|
752 Name =>
|
|
|
753 Make_Slice (Loc,
|
|
|
754 Prefix =>
|
|
|
755 Make_Explicit_Dereference (Loc,
|
|
|
756 Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
|
|
|
757 Make_Explicit_Dereference (Loc,
|
|
|
758 Unchecked_Convert_To (RTE (RE_Addr_Ptr),
|
|
|
759 New_Tag_Node)))),
|
|
|
760 Discrete_Range => Make_Range (Loc,
|
|
|
761 Make_Integer_Literal (Loc, Uint_1),
|
|
|
762 New_Occurrence_Of (RTE (RE_Max_Predef_Prims), Loc))),
|
|
|
763
|
|
|
764 Expression =>
|
|
|
765 Make_Slice (Loc,
|
|
|
766 Prefix =>
|
|
|
767 Make_Explicit_Dereference (Loc,
|
|
|
768 Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
|
|
|
769 Make_Explicit_Dereference (Loc,
|
|
|
770 Unchecked_Convert_To (RTE (RE_Addr_Ptr),
|
|
|
771 Old_Tag_Node)))),
|
|
|
772 Discrete_Range =>
|
|
|
773 Make_Range (Loc,
|
|
|
774 Make_Integer_Literal (Loc, 1),
|
|
|
775 New_Occurrence_Of (RTE (RE_Max_Predef_Prims), Loc))));
|
|
|
776 end Build_Inherit_Predefined_Prims;
|
|
|
777
|
|
|
778 -------------------------
|
|
|
779 -- Build_Offset_To_Top --
|
|
|
780 -------------------------
|
|
|
781
|
|
|
782 function Build_Offset_To_Top
|
|
|
783 (Loc : Source_Ptr;
|
|
|
784 This_Node : Node_Id) return Node_Id
|
|
|
785 is
|
|
|
786 Tag_Node : Node_Id;
|
|
|
787
|
|
|
788 begin
|
|
|
789 Tag_Node :=
|
|
|
790 Make_Explicit_Dereference (Loc,
|
|
|
791 Unchecked_Convert_To (RTE (RE_Tag_Ptr), This_Node));
|
|
|
792
|
|
|
793 return
|
|
|
794 Make_Explicit_Dereference (Loc,
|
|
|
795 Unchecked_Convert_To (RTE (RE_Offset_To_Top_Ptr),
|
|
|
796 Make_Function_Call (Loc,
|
|
|
797 Name =>
|
|
|
798 Make_Expanded_Name (Loc,
|
|
|
799 Chars => Name_Op_Subtract,
|
|
|
800 Prefix =>
|
|
|
801 New_Occurrence_Of
|
|
|
802 (RTU_Entity (System_Storage_Elements), Loc),
|
|
|
803 Selector_Name => Make_Identifier (Loc, Name_Op_Subtract)),
|
|
|
804 Parameter_Associations => New_List (
|
|
|
805 Unchecked_Convert_To (RTE (RE_Address), Tag_Node),
|
|
|
806 New_Occurrence_Of
|
|
|
807 (RTE (RE_DT_Offset_To_Top_Offset), Loc)))));
|
|
|
808 end Build_Offset_To_Top;
|
|
|
809
|
|
|
810 ------------------------------------------
|
|
|
811 -- Build_Set_Predefined_Prim_Op_Address --
|
|
|
812 ------------------------------------------
|
|
|
813
|
|
|
814 function Build_Set_Predefined_Prim_Op_Address
|
|
|
815 (Loc : Source_Ptr;
|
|
|
816 Tag_Node : Node_Id;
|
|
|
817 Position : Uint;
|
|
|
818 Address_Node : Node_Id) return Node_Id
|
|
|
819 is
|
|
|
820 begin
|
|
|
821 return
|
|
|
822 Make_Assignment_Statement (Loc,
|
|
|
823 Name =>
|
|
|
824 Make_Indexed_Component (Loc,
|
|
|
825 Prefix =>
|
|
|
826 Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
|
|
|
827 Make_Explicit_Dereference (Loc,
|
|
|
828 Unchecked_Convert_To (RTE (RE_Addr_Ptr), Tag_Node))),
|
|
|
829 Expressions =>
|
|
|
830 New_List (Make_Integer_Literal (Loc, Position))),
|
|
|
831
|
|
|
832 Expression => Address_Node);
|
|
|
833 end Build_Set_Predefined_Prim_Op_Address;
|
|
|
834
|
|
|
835 -------------------------------
|
|
|
836 -- Build_Set_Prim_Op_Address --
|
|
|
837 -------------------------------
|
|
|
838
|
|
|
839 function Build_Set_Prim_Op_Address
|
|
|
840 (Loc : Source_Ptr;
|
|
|
841 Typ : Entity_Id;
|
|
|
842 Tag_Node : Node_Id;
|
|
|
843 Position : Uint;
|
|
|
844 Address_Node : Node_Id) return Node_Id
|
|
|
845 is
|
|
|
846 Ctrl_Tag : Node_Id := Tag_Node;
|
|
|
847 New_Node : Node_Id;
|
|
|
848
|
|
|
849 begin
|
|
|
850 Build_Get_Prim_Op_Address (Loc, Typ, Position, Ctrl_Tag, New_Node);
|
|
|
851
|
|
|
852 return
|
|
|
853 Make_Assignment_Statement (Loc,
|
|
|
854 Name => New_Node,
|
|
|
855 Expression => Address_Node);
|
|
|
856 end Build_Set_Prim_Op_Address;
|
|
|
857
|
|
|
858 -----------------------------
|
|
|
859 -- Build_Set_Size_Function --
|
|
|
860 -----------------------------
|
|
|
861
|
|
|
862 function Build_Set_Size_Function
|
|
|
863 (Loc : Source_Ptr;
|
|
|
864 Tag_Node : Node_Id;
|
|
|
865 Size_Func : Entity_Id) return Node_Id is
|
|
|
866 begin
|
|
|
867 pragma Assert (Chars (Size_Func) = Name_uSize
|
|
|
868 and then RTE_Record_Component_Available (RE_Size_Func));
|
|
|
869 return
|
|
|
870 Make_Assignment_Statement (Loc,
|
|
|
871 Name =>
|
|
|
872 Make_Selected_Component (Loc,
|
|
|
873 Prefix =>
|
|
|
874 Build_TSD (Loc,
|
|
|
875 Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
|
|
|
876 Selector_Name =>
|
|
|
877 New_Occurrence_Of
|
|
|
878 (RTE_Record_Component (RE_Size_Func), Loc)),
|
|
|
879 Expression =>
|
|
|
880 Unchecked_Convert_To (RTE (RE_Size_Ptr),
|
|
|
881 Make_Attribute_Reference (Loc,
|
|
|
882 Prefix => New_Occurrence_Of (Size_Func, Loc),
|
|
|
883 Attribute_Name => Name_Unrestricted_Access)));
|
|
|
884 end Build_Set_Size_Function;
|
|
|
885
|
|
|
886 ------------------------------------
|
|
|
887 -- Build_Set_Static_Offset_To_Top --
|
|
|
888 ------------------------------------
|
|
|
889
|
|
|
890 function Build_Set_Static_Offset_To_Top
|
|
|
891 (Loc : Source_Ptr;
|
|
|
892 Iface_Tag : Node_Id;
|
|
|
893 Offset_Value : Node_Id) return Node_Id is
|
|
|
894 begin
|
|
|
895 return
|
|
|
896 Make_Assignment_Statement (Loc,
|
|
|
897 Make_Explicit_Dereference (Loc,
|
|
|
898 Unchecked_Convert_To (RTE (RE_Offset_To_Top_Ptr),
|
|
|
899 Make_Function_Call (Loc,
|
|
|
900 Name =>
|
|
|
901 Make_Expanded_Name (Loc,
|
|
|
902 Chars => Name_Op_Subtract,
|
|
|
903 Prefix =>
|
|
|
904 New_Occurrence_Of
|
|
|
905 (RTU_Entity (System_Storage_Elements), Loc),
|
|
|
906 Selector_Name => Make_Identifier (Loc, Name_Op_Subtract)),
|
|
|
907 Parameter_Associations => New_List (
|
|
|
908 Unchecked_Convert_To (RTE (RE_Address), Iface_Tag),
|
|
|
909 New_Occurrence_Of
|
|
|
910 (RTE (RE_DT_Offset_To_Top_Offset), Loc))))),
|
|
|
911 Offset_Value);
|
|
|
912 end Build_Set_Static_Offset_To_Top;
|
|
|
913
|
|
|
914 ---------------
|
|
|
915 -- Build_TSD --
|
|
|
916 ---------------
|
|
|
917
|
|
|
918 function Build_TSD
|
|
|
919 (Loc : Source_Ptr;
|
|
|
920 Tag_Node_Addr : Node_Id) return Node_Id is
|
|
|
921 begin
|
|
|
922 return
|
|
|
923 Unchecked_Convert_To (RTE (RE_Type_Specific_Data_Ptr),
|
|
|
924 Make_Explicit_Dereference (Loc,
|
|
|
925 Prefix => Unchecked_Convert_To (RTE (RE_Addr_Ptr),
|
|
|
926 Make_Function_Call (Loc,
|
|
|
927 Name =>
|
|
|
928 Make_Expanded_Name (Loc,
|
|
|
929 Chars => Name_Op_Subtract,
|
|
|
930 Prefix =>
|
|
|
931 New_Occurrence_Of
|
|
|
932 (RTU_Entity (System_Storage_Elements), Loc),
|
|
|
933 Selector_Name => Make_Identifier (Loc, Name_Op_Subtract)),
|
|
|
934
|
|
|
935 Parameter_Associations => New_List (
|
|
|
936 Tag_Node_Addr,
|
|
|
937 New_Occurrence_Of
|
|
|
938 (RTE (RE_DT_Typeinfo_Ptr_Size), Loc))))));
|
|
|
939 end Build_TSD;
|
|
|
940
|
|
|
941 end Exp_Atag;
|
