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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 _ S E L --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1992-2015, 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 Einfo; use Einfo;
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27 with Nlists; use Nlists;
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28 with Nmake; use Nmake;
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29 with Opt; use Opt;
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30 with Rtsfind; use Rtsfind;
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31 with Sinfo; use Sinfo;
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32 with Snames; use Snames;
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33 with Stand; use Stand;
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34 with Tbuild; use Tbuild;
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35
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36 package body Exp_Sel is
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37
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38 -----------------------
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39 -- Build_Abort_Block --
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40 -----------------------
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41
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42 function Build_Abort_Block
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43 (Loc : Source_Ptr;
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44 Abr_Blk_Ent : Entity_Id;
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45 Cln_Blk_Ent : Entity_Id;
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46 Blk : Node_Id) return Node_Id
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47 is
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48 begin
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49 return
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50 Make_Block_Statement (Loc,
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51 Identifier => New_Occurrence_Of (Abr_Blk_Ent, Loc),
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52
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53 Declarations => No_List,
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54
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55 Handled_Statement_Sequence =>
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56 Make_Handled_Sequence_Of_Statements (Loc,
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57 Statements =>
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58 New_List (
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59 Make_Implicit_Label_Declaration (Loc,
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60 Defining_Identifier => Cln_Blk_Ent,
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61 Label_Construct => Blk),
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62 Blk),
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63
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64 Exception_Handlers =>
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65 New_List (Build_Abort_Block_Handler (Loc))));
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66 end Build_Abort_Block;
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67
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68 -------------------------------
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69 -- Build_Abort_Block_Handler --
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70 -------------------------------
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71
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72 function Build_Abort_Block_Handler (Loc : Source_Ptr) return Node_Id is
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73 Stmt : Node_Id;
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74
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75 begin
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76
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77 -- With ZCX exceptions, aborts are not defered in handlers. With SJLJ,
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78 -- they are deferred at the beginning of Abort_Signal handlers.
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79
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80 if ZCX_Exceptions then
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81 Stmt := Make_Null_Statement (Loc);
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82
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83 else
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84 Stmt :=
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85 Make_Procedure_Call_Statement (Loc,
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86 Name => New_Occurrence_Of (RTE (RE_Abort_Undefer), Loc),
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87 Parameter_Associations => No_List);
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88 end if;
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89
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90 return Make_Implicit_Exception_Handler (Loc,
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91 Exception_Choices =>
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92 New_List (New_Occurrence_Of (Stand.Abort_Signal, Loc)),
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93 Statements => New_List (Stmt));
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94 end Build_Abort_Block_Handler;
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95
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96 -------------
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97 -- Build_B --
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98 -------------
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99
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100 function Build_B
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101 (Loc : Source_Ptr;
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102 Decls : List_Id) return Entity_Id
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103 is
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104 B : constant Entity_Id := Make_Temporary (Loc, 'B');
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105 begin
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106 Append_To (Decls,
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107 Make_Object_Declaration (Loc,
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108 Defining_Identifier => B,
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109 Object_Definition => New_Occurrence_Of (Standard_Boolean, Loc),
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110 Expression => New_Occurrence_Of (Standard_False, Loc)));
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111 return B;
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112 end Build_B;
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113
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114 -------------
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115 -- Build_C --
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116 -------------
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117
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118 function Build_C
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119 (Loc : Source_Ptr;
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120 Decls : List_Id) return Entity_Id
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121 is
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122 C : constant Entity_Id := Make_Temporary (Loc, 'C');
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123 begin
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124 Append_To (Decls,
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125 Make_Object_Declaration (Loc,
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126 Defining_Identifier => C,
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127 Object_Definition =>
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128 New_Occurrence_Of (RTE (RE_Prim_Op_Kind), Loc)));
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129 return C;
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130 end Build_C;
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131
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132 -------------------------
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133 -- Build_Cleanup_Block --
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134 -------------------------
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135
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136 function Build_Cleanup_Block
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137 (Loc : Source_Ptr;
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138 Blk_Ent : Entity_Id;
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139 Stmts : List_Id;
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140 Clean_Ent : Entity_Id) return Node_Id
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141 is
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142 Cleanup_Block : constant Node_Id :=
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143 Make_Block_Statement (Loc,
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144 Identifier =>
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145 New_Occurrence_Of (Blk_Ent, Loc),
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146 Declarations => No_List,
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147 Handled_Statement_Sequence =>
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148 Make_Handled_Sequence_Of_Statements (Loc,
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149 Statements => Stmts),
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150 Is_Asynchronous_Call_Block => True);
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151
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152 begin
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153 Set_Entry_Cancel_Parameter (Blk_Ent, Clean_Ent);
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154
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155 return Cleanup_Block;
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156 end Build_Cleanup_Block;
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157
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158 -------------
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159 -- Build_K --
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160 -------------
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161
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162 function Build_K
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163 (Loc : Source_Ptr;
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164 Decls : List_Id;
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165 Obj : Entity_Id) return Entity_Id
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166 is
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167 K : constant Entity_Id := Make_Temporary (Loc, 'K');
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168 Tag_Node : Node_Id;
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169
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170 begin
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171 if Tagged_Type_Expansion then
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172 Tag_Node := Unchecked_Convert_To (RTE (RE_Tag), Obj);
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173 else
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174 Tag_Node :=
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175 Make_Attribute_Reference (Loc,
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176 Prefix => Obj,
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177 Attribute_Name => Name_Tag);
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178 end if;
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179
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180 Append_To (Decls,
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181 Make_Object_Declaration (Loc,
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182 Defining_Identifier => K,
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183 Object_Definition =>
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184 New_Occurrence_Of (RTE (RE_Tagged_Kind), Loc),
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185 Expression =>
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186 Make_Function_Call (Loc,
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187 Name => New_Occurrence_Of (RTE (RE_Get_Tagged_Kind), Loc),
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188 Parameter_Associations => New_List (Tag_Node))));
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189 return K;
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190 end Build_K;
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191
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192 -------------
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193 -- Build_S --
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194 -------------
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195
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196 function Build_S
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197 (Loc : Source_Ptr;
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198 Decls : List_Id) return Entity_Id
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199 is
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200 S : constant Entity_Id := Make_Temporary (Loc, 'S');
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201 begin
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202 Append_To (Decls,
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203 Make_Object_Declaration (Loc,
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204 Defining_Identifier => S,
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205 Object_Definition => New_Occurrence_Of (Standard_Integer, Loc)));
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206 return S;
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207 end Build_S;
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208
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209 ------------------------
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210 -- Build_S_Assignment --
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211 ------------------------
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212
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213 function Build_S_Assignment
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214 (Loc : Source_Ptr;
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215 S : Entity_Id;
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216 Obj : Entity_Id;
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217 Call_Ent : Entity_Id) return Node_Id
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218 is
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219 Typ : constant Entity_Id := Etype (Obj);
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220
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221 begin
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222 if Tagged_Type_Expansion then
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223 return
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224 Make_Assignment_Statement (Loc,
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225 Name => New_Occurrence_Of (S, Loc),
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226 Expression =>
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227 Make_Function_Call (Loc,
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228 Name => New_Occurrence_Of (RTE (RE_Get_Offset_Index), Loc),
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229 Parameter_Associations => New_List (
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230 Unchecked_Convert_To (RTE (RE_Tag), Obj),
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231 Make_Integer_Literal (Loc, DT_Position (Call_Ent)))));
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232
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233 -- VM targets
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234
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235 else
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236 return
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237 Make_Assignment_Statement (Loc,
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238 Name => New_Occurrence_Of (S, Loc),
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239 Expression =>
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240 Make_Function_Call (Loc,
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241 Name => New_Occurrence_Of (RTE (RE_Get_Offset_Index), Loc),
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242
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243 Parameter_Associations => New_List (
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244
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245 -- Obj_Typ
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246
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247 Make_Attribute_Reference (Loc,
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248 Prefix => Obj,
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249 Attribute_Name => Name_Tag),
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250
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251 -- Iface_Typ
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252
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253 Make_Attribute_Reference (Loc,
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254 Prefix => New_Occurrence_Of (Typ, Loc),
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255 Attribute_Name => Name_Tag),
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256
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257 -- Position
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258
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259 Make_Integer_Literal (Loc, DT_Position (Call_Ent)))));
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260 end if;
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261 end Build_S_Assignment;
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262
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263 end Exp_Sel;
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