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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 -- L I B . L O A D --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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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 Debug; use Debug;
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28 with Einfo; use Einfo;
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29 with Errout; use Errout;
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30 with Fname; use Fname;
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31 with Fname.UF; use Fname.UF;
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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 Osint; use Osint;
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36 with Osint.C; use Osint.C;
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37 with Output; use Output;
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38 with Par;
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39 with Restrict; use Restrict;
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40 with Scn; use Scn;
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41 with Sinfo; use Sinfo;
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42 with Sinput; use Sinput;
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43 with Sinput.L; use Sinput.L;
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44 with Stand; use Stand;
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45 with Tbuild; use Tbuild;
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46 with Uname; use Uname;
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47
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48 package body Lib.Load is
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49
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50 -----------------------
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51 -- Local Subprograms --
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52 -----------------------
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53
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54 function From_Limited_With_Chain return Boolean;
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55 -- Check whether a possible circular dependence includes units that
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56 -- have been loaded through limited_with clauses, in which case there
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57 -- is no real circularity.
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58
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59 function Spec_Is_Irrelevant
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60 (Spec_Unit : Unit_Number_Type;
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61 Body_Unit : Unit_Number_Type) return Boolean;
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62 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
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63 -- spec file that corresponds to the main unit which is a body. This
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64 -- function determines if the spec file is irrelevant and will be
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65 -- overridden by the body as described in RM 10.1.4(4). See description
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66 -- in "Special Handling of Subprogram Bodies" for further details.
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67
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68 procedure Write_Dependency_Chain;
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69 -- This procedure is used to generate error message info lines that
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70 -- trace the current dependency chain when a load error occurs.
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71
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72 ------------------------------
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73 -- Change_Main_Unit_To_Spec --
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74 ------------------------------
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75
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76 procedure Change_Main_Unit_To_Spec is
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77 U : Unit_Record renames Units.Table (Main_Unit);
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78 N : File_Name_Type;
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79 X : Source_File_Index;
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80
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81 begin
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82 -- Get name of unit body
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83
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84 Get_Name_String (U.Unit_File_Name);
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85
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86 -- Note: for the following we should really generalize and consult the
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87 -- file name pattern data, but for now we just deal with the common
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88 -- naming cases, which is probably good enough in practice ???
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89
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90 -- Change .adb to .ads
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91
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92 if Name_Len >= 5
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93 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb"
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94 then
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95 Name_Buffer (Name_Len) := 's';
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96
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97 -- Change .2.ada to .1.ada (Rational convention)
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98
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99 elsif Name_Len >= 7
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100 and then Name_Buffer (Name_Len - 5 .. Name_Len) = ".2.ada"
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101 then
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102 Name_Buffer (Name_Len - 4) := '1';
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103
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104 -- Change .ada to _.ada (DEC convention)
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105
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106 elsif Name_Len >= 5
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107 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".ada"
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108 then
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109 Name_Buffer (Name_Len - 3 .. Name_Len + 1) := "_.ada";
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110 Name_Len := Name_Len + 1;
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111
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112 -- No match, don't make the change
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113
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114 else
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115 return;
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116 end if;
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117
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118 -- Try loading the spec
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119
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120 N := Name_Find;
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121 X := Load_Source_File (N);
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122
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123 -- No change if we did not find the spec
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124
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125 if X <= No_Source_File then
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126 return;
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127 end if;
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128
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129 -- Otherwise modify Main_Unit entry to point to spec
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130
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131 U.Unit_File_Name := N;
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132 U.Source_Index := X;
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133 end Change_Main_Unit_To_Spec;
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134
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135 -------------------------------
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136 -- Create_Dummy_Package_Unit --
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137 -------------------------------
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138
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139 function Create_Dummy_Package_Unit
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140 (With_Node : Node_Id;
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141 Spec_Name : Unit_Name_Type) return Unit_Number_Type
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142 is
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143 Unum : Unit_Number_Type;
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144 Cunit_Entity : Entity_Id;
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145 Cunit : Node_Id;
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146 Du_Name : Node_Or_Entity_Id;
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147 End_Lab : Node_Id;
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148 Fname : constant File_Name_Type :=
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149 Get_File_Name (Spec_Name, Subunit => False);
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150 Pre_Name : constant Boolean :=
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151 Is_Predefined_File_Name (Fname, Renamings_Included => False);
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152 Ren_Name : constant Boolean :=
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153 Is_Predefined_Renaming_File_Name (Fname);
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154 GNAT_Name : constant Boolean :=
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155 Is_GNAT_File_Name (Fname);
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156 Save_CS : constant Boolean := Get_Comes_From_Source_Default;
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157
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158 begin
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159 -- The created dummy package unit does not come from source
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160
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161 Set_Comes_From_Source_Default (False);
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162
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163 -- Normal package
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164
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165 if Nkind (Name (With_Node)) = N_Identifier then
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166 Cunit_Entity :=
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167 Make_Defining_Identifier (No_Location,
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168 Chars => Chars (Name (With_Node)));
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169 Du_Name := Cunit_Entity;
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170 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
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171
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172 -- Child package
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173
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174 else
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175 Cunit_Entity :=
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176 Make_Defining_Identifier (No_Location,
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177 Chars => Chars (Selector_Name (Name (With_Node))));
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178 Du_Name :=
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179 Make_Defining_Program_Unit_Name (No_Location,
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180 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
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181 Defining_Identifier => Cunit_Entity);
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182
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183 Set_Is_Child_Unit (Cunit_Entity);
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184
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185 End_Lab :=
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186 Make_Designator (No_Location,
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187 Name => Copy_Separate_Tree (Prefix (Name (With_Node))),
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188 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
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189 end if;
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190
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191 Set_Scope (Cunit_Entity, Standard_Standard);
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192
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193 Cunit :=
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194 Make_Compilation_Unit (No_Location,
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195 Context_Items => Empty_List,
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196 Unit =>
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197 Make_Package_Declaration (No_Location,
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198 Specification =>
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199 Make_Package_Specification (No_Location,
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200 Defining_Unit_Name => Du_Name,
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201 Visible_Declarations => Empty_List,
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202 End_Label => End_Lab)),
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203 Aux_Decls_Node =>
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204 Make_Compilation_Unit_Aux (No_Location));
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205
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206 -- Mark the dummy package as analyzed to prevent analysis of this
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207 -- (non-existent) unit in -gnatQ mode because at the moment the
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208 -- structure and attributes of this dummy package does not allow
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209 -- a normal analysis of this unit
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210
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211 Set_Analyzed (Cunit);
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212
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213 Units.Increment_Last;
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214 Unum := Units.Last;
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215
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216 Units.Table (Unum) :=
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217 (Cunit => Cunit,
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218 Cunit_Entity => Cunit_Entity,
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219 Dependency_Num => 0,
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220 Dynamic_Elab => False,
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221 Error_Location => Sloc (With_Node),
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222 Expected_Unit => Spec_Name,
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223 Fatal_Error => Error_Detected,
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224 Generate_Code => False,
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225 Has_RACW => False,
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226 Filler => False,
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227 Ident_String => Empty,
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228
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229 Is_Predefined_Renaming => Ren_Name,
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230 Is_Predefined_Unit => Pre_Name or Ren_Name,
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231 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
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232 Filler2 => False,
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233
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234 Loading => False,
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235 Main_Priority => Default_Main_Priority,
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236 Main_CPU => Default_Main_CPU,
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237 Primary_Stack_Count => 0,
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238 Sec_Stack_Count => 0,
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239 Munit_Index => 0,
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240 No_Elab_Code_All => False,
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241 Serial_Number => 0,
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242 Source_Index => No_Source_File,
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243 Unit_File_Name => Fname,
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244 Unit_Name => Spec_Name,
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245 Version => 0,
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246 OA_Setting => 'O');
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247
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248 Init_Unit_Name (Unum, Spec_Name);
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249
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250 Set_Comes_From_Source_Default (Save_CS);
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251 Set_Error_Posted (Cunit_Entity);
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252 Set_Error_Posted (Cunit);
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253 return Unum;
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254 end Create_Dummy_Package_Unit;
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255
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256 -----------------------------
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257 -- From_Limited_With_Chain --
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258 -----------------------------
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259
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260 function From_Limited_With_Chain return Boolean is
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261 Curr_Num : constant Unit_Number_Type :=
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262 Load_Stack.Table (Load_Stack.Last).Unit_Number;
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263
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264 begin
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265 -- True if the current load operation is through a limited_with clause
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266 -- and we are not within a loop of regular with_clauses.
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267
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268 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop
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269 if Load_Stack.Table (U).Unit_Number = Curr_Num then
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270 return False;
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271
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272 elsif Present (Load_Stack.Table (U).With_Node)
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273 and then Limited_Present (Load_Stack.Table (U).With_Node)
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274 then
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275 return True;
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276 end if;
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277 end loop;
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278
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279 return False;
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280 end From_Limited_With_Chain;
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281
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282 ----------------
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283 -- Initialize --
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284 ----------------
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285
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286 procedure Initialize is
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287 begin
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288 Units.Init;
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289 Load_Stack.Init;
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290 end Initialize;
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291
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292 ------------------------
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293 -- Initialize_Version --
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294 ------------------------
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295
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296 procedure Initialize_Version (U : Unit_Number_Type) is
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297 begin
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298 Units.Table (U).Version := Source_Checksum (Source_Index (U));
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299 end Initialize_Version;
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300
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301 ----------------------
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302 -- Load_Main_Source --
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303 ----------------------
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304
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305 procedure Load_Main_Source is
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306 Fname : constant File_Name_Type := Next_Main_Source;
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307 Pre_Name : constant Boolean :=
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308 Is_Predefined_File_Name (Fname, Renamings_Included => False);
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309 Ren_Name : constant Boolean :=
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310 Is_Predefined_Renaming_File_Name (Fname);
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311 GNAT_Name : constant Boolean :=
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312 Is_GNAT_File_Name (Fname);
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313 Version : Word := 0;
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314
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315 begin
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316 Load_Stack.Increment_Last;
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317 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty);
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318
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319 -- Initialize unit table entry for Main_Unit. Note that we don't know
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320 -- the unit name yet, that gets filled in when the parser parses the
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321 -- main unit, at which time a check is made that it matches the main
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322 -- file name, and then the Unit_Name field is set. The Cunit and
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323 -- Cunit_Entity fields also get filled in later by the parser.
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324
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325 Units.Increment_Last;
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326
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327 Units.Table (Main_Unit).Unit_File_Name := Fname;
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328
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329 if Fname /= No_File then
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330 Main_Source_File := Load_Source_File (Fname);
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331 Current_Error_Source_File := Main_Source_File;
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332
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333 if Main_Source_File > No_Source_File then
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334 Version := Source_Checksum (Main_Source_File);
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335
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336 else
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337 -- To avoid emitting a source location (since there is no file),
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338 -- we write a custom error message instead of using the machinery
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339 -- in errout.adb.
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340
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341 Set_Standard_Error;
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342
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343 if Main_Source_File = No_Access_To_Source_File then
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344 Write_Str
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345 ("no read access for file """ & Get_Name_String (Fname)
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346 & """");
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347 else
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348 Write_Str
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349 ("file """ & Get_Name_String (Fname) & """ not found");
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350 end if;
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351
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352 Write_Eol;
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353 Set_Standard_Output;
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354 end if;
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355
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356 Units.Table (Main_Unit) :=
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357 (Cunit => Empty,
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358 Cunit_Entity => Empty,
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359 Dependency_Num => 0,
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360 Dynamic_Elab => False,
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361 Error_Location => No_Location,
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362 Expected_Unit => No_Unit_Name,
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363 Fatal_Error => None,
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364 Generate_Code => False,
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365 Has_RACW => False,
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366 Filler => False,
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367 Ident_String => Empty,
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368
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369 Is_Predefined_Renaming => Ren_Name,
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370 Is_Predefined_Unit => Pre_Name or Ren_Name,
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371 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
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372 Filler2 => False,
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373
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374 Loading => True,
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375 Main_Priority => Default_Main_Priority,
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376 Main_CPU => Default_Main_CPU,
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377 Primary_Stack_Count => 0,
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378 Sec_Stack_Count => 0,
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379
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380 Munit_Index => 0,
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381 No_Elab_Code_All => False,
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382 Serial_Number => 0,
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383 Source_Index => Main_Source_File,
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384 Unit_File_Name => Fname,
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385 Unit_Name => No_Unit_Name,
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386 Version => Version,
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387 OA_Setting => 'O');
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388 end if;
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389 end Load_Main_Source;
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390
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391 ---------------
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392 -- Load_Unit --
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393 ---------------
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394
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395 function Load_Unit
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396 (Load_Name : Unit_Name_Type;
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397 Required : Boolean;
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398 Error_Node : Node_Id;
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399 Subunit : Boolean;
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400 Corr_Body : Unit_Number_Type := No_Unit;
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401 Renamings : Boolean := False;
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402 With_Node : Node_Id := Empty;
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403 PMES : Boolean := False) return Unit_Number_Type
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404 is
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405 Calling_Unit : Unit_Number_Type;
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406 Uname_Actual : Unit_Name_Type;
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407 Unum : Unit_Number_Type;
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408 Unump : Unit_Number_Type;
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409 Fname : File_Name_Type;
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410 Pre_Name : Boolean;
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411 Ren_Name : Boolean;
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412 GNAT_Name : Boolean;
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413 Src_Ind : Source_File_Index;
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414 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
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415
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416 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions :=
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417 Cunit_Boolean_Restrictions_Save;
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418 -- Save current restrictions for restore at end
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419
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420 begin
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421 Parsing_Main_Extended_Source := PMES;
|
|
|
422
|
|
|
423 -- Initialize restrictions to config restrictions for unit to load if
|
|
|
424 -- it is part of the main extended source, otherwise reset them.
|
|
|
425
|
|
|
426 -- Note: it's a bit odd but PMES is False for subunits, which is why
|
|
|
427 -- we have the OR here. Should be investigated some time???
|
|
|
428
|
|
|
429 if PMES or Subunit then
|
|
|
430 Restore_Config_Cunit_Boolean_Restrictions;
|
|
|
431 else
|
|
|
432 Reset_Cunit_Boolean_Restrictions;
|
|
|
433 end if;
|
|
|
434
|
|
|
435 -- If renamings are allowed and we have a child unit name, then we
|
|
|
436 -- must first load the parent to deal with finding the real name.
|
|
|
437 -- Retain the with_clause that names the child, so that if it is
|
|
|
438 -- limited, the parent is loaded under the same condition.
|
|
|
439
|
|
|
440 if Renamings and then Is_Child_Name (Load_Name) then
|
|
|
441 Unump :=
|
|
|
442 Load_Unit
|
|
|
443 (Load_Name => Get_Parent_Spec_Name (Load_Name),
|
|
|
444 Required => Required,
|
|
|
445 Subunit => False,
|
|
|
446 Renamings => True,
|
|
|
447 Error_Node => Error_Node,
|
|
|
448 With_Node => With_Node);
|
|
|
449
|
|
|
450 if Unump = No_Unit then
|
|
|
451 Parsing_Main_Extended_Source := Save_PMES;
|
|
|
452 return No_Unit;
|
|
|
453 end if;
|
|
|
454
|
|
|
455 -- If parent is a renaming, then we use the renamed package as
|
|
|
456 -- the actual parent for the subsequent load operation.
|
|
|
457
|
|
|
458 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then
|
|
|
459 Uname_Actual :=
|
|
|
460 New_Child
|
|
|
461 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump)))));
|
|
|
462
|
|
|
463 -- If the load is for a with_clause, for visibility purposes both
|
|
|
464 -- the renamed entity and renaming one must be available in the
|
|
|
465 -- current unit: the renamed one in order to retrieve the child
|
|
|
466 -- unit, and the original one because it may be used as a prefix
|
|
|
467 -- in the body of the current unit. We add an explicit with_clause
|
|
|
468 -- for the original parent so that the renaming declaration is
|
|
|
469 -- properly loaded and analyzed.
|
|
|
470
|
|
|
471 if Present (With_Node) then
|
|
|
472 Insert_After (With_Node,
|
|
|
473 Make_With_Clause (Sloc (With_Node),
|
|
|
474 Name => Copy_Separate_Tree (Prefix (Name (With_Node)))));
|
|
|
475 end if;
|
|
|
476
|
|
|
477 -- Save the renaming entity, to establish its visibility when
|
|
|
478 -- installing the context. The implicit with is on this entity,
|
|
|
479 -- not on the package it renames. This is somewhat redundant given
|
|
|
480 -- the with_clause just created, but it simplifies subsequent
|
|
|
481 -- expansion of the current with_clause. Optimizable ???
|
|
|
482
|
|
|
483 if Nkind (Error_Node) = N_With_Clause
|
|
|
484 and then Nkind (Name (Error_Node)) = N_Selected_Component
|
|
|
485 then
|
|
|
486 declare
|
|
|
487 Par : Node_Id := Name (Error_Node);
|
|
|
488
|
|
|
489 begin
|
|
|
490 while Nkind (Par) = N_Selected_Component
|
|
|
491 and then Chars (Selector_Name (Par)) /=
|
|
|
492 Chars (Cunit_Entity (Unump))
|
|
|
493 loop
|
|
|
494 Par := Prefix (Par);
|
|
|
495 end loop;
|
|
|
496
|
|
|
497 -- Case of some intermediate parent is a renaming
|
|
|
498
|
|
|
499 if Nkind (Par) = N_Selected_Component then
|
|
|
500 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
|
|
|
501
|
|
|
502 -- Case where the ultimate parent is a renaming
|
|
|
503
|
|
|
504 else
|
|
|
505 Set_Entity (Par, Cunit_Entity (Unump));
|
|
|
506 end if;
|
|
|
507 end;
|
|
|
508 end if;
|
|
|
509
|
|
|
510 -- If the parent is not a renaming, then get its name (this may
|
|
|
511 -- be different from the parent spec name obtained above because
|
|
|
512 -- of renamings higher up in the hierarchy).
|
|
|
513
|
|
|
514 else
|
|
|
515 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
|
|
|
516 end if;
|
|
|
517
|
|
|
518 -- Here if unit to be loaded is not a child unit
|
|
|
519
|
|
|
520 else
|
|
|
521 Uname_Actual := Load_Name;
|
|
|
522 end if;
|
|
|
523
|
|
|
524 Fname := Get_File_Name (Uname_Actual, Subunit);
|
|
|
525 Pre_Name :=
|
|
|
526 Is_Predefined_File_Name (Fname, Renamings_Included => False);
|
|
|
527 Ren_Name := Is_Predefined_Renaming_File_Name (Fname);
|
|
|
528 GNAT_Name := Is_GNAT_File_Name (Fname);
|
|
|
529
|
|
|
530 if Debug_Flag_L then
|
|
|
531 Write_Eol;
|
|
|
532 Write_Str ("*** Load request for unit: ");
|
|
|
533 Write_Unit_Name (Load_Name);
|
|
|
534
|
|
|
535 if Required then
|
|
|
536 Write_Str (" (Required = True)");
|
|
|
537 else
|
|
|
538 Write_Str (" (Required = False)");
|
|
|
539 end if;
|
|
|
540
|
|
|
541 Write_Eol;
|
|
|
542
|
|
|
543 if Uname_Actual /= Load_Name then
|
|
|
544 Write_Str ("*** Actual unit loaded: ");
|
|
|
545 Write_Unit_Name (Uname_Actual);
|
|
|
546 end if;
|
|
|
547 end if;
|
|
|
548
|
|
|
549 -- Capture error location if it is for the main unit. The idea is to
|
|
|
550 -- post errors on the main unit location, not the most recent unit.
|
|
|
551 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
|
|
|
552
|
|
|
553 if Present (Error_Node)
|
|
|
554 and then Unit_Name (Main_Unit) /= No_Unit_Name
|
|
|
555 then
|
|
|
556 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
|
|
|
557 -- do the trick here, but that's wrong, it is much too early to
|
|
|
558 -- call this routine. We are still in the parser, and the required
|
|
|
559 -- semantic information is not established yet. So we base the
|
|
|
560 -- judgment on unit names.
|
|
|
561
|
|
|
562 Get_External_Unit_Name_String (Unit_Name (Main_Unit));
|
|
|
563
|
|
|
564 declare
|
|
|
565 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
|
|
|
566
|
|
|
567 begin
|
|
|
568 Get_External_Unit_Name_String
|
|
|
569 (Unit_Name (Get_Source_Unit (Error_Node)));
|
|
|
570
|
|
|
571 -- If the two names are identical, then for sure we are part
|
|
|
572 -- of the extended main unit
|
|
|
573
|
|
|
574 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
|
|
|
575 Load_Msg_Sloc := Sloc (Error_Node);
|
|
|
576
|
|
|
577 -- If the load is called from a with_type clause, the error
|
|
|
578 -- node is correct.
|
|
|
579
|
|
|
580 -- Otherwise, check for the subunit case, and if so, consider
|
|
|
581 -- we have a match if one name is a prefix of the other name.
|
|
|
582
|
|
|
583 else
|
|
|
584 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
|
|
|
585 or else
|
|
|
586 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
|
|
|
587 N_Subunit
|
|
|
588 then
|
|
|
589 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
|
|
|
590
|
|
|
591 if Name_Buffer (1 .. Name_Len)
|
|
|
592 =
|
|
|
593 Main_Unit_Name (1 .. Name_Len)
|
|
|
594 then
|
|
|
595 Load_Msg_Sloc := Sloc (Error_Node);
|
|
|
596 end if;
|
|
|
597 end if;
|
|
|
598 end if;
|
|
|
599 end;
|
|
|
600 end if;
|
|
|
601
|
|
|
602 -- If we are generating error messages, then capture calling unit
|
|
|
603
|
|
|
604 if Present (Error_Node) then
|
|
|
605 Calling_Unit := Get_Source_Unit (Error_Node);
|
|
|
606 else
|
|
|
607 Calling_Unit := No_Unit;
|
|
|
608 end if;
|
|
|
609
|
|
|
610 -- See if we already have an entry for this unit
|
|
|
611
|
|
145
|
612 Unum := Unit_Names.Get (Uname_Actual);
|
|
|
613 if Unum = No_Unit then
|
|
|
614 Unum := Units.Last + 1;
|
|
|
615 end if;
|
|
111
|
616
|
|
|
617 -- Whether or not the entry was found, Unum is now the right value,
|
|
|
618 -- since it is one more than Units.Last (i.e. the index of the new
|
|
|
619 -- entry we will create) in the not found case.
|
|
|
620
|
|
|
621 -- A special check is necessary in the unit not found case. If the unit
|
|
|
622 -- is not found, but the file in which it lives has already been loaded,
|
|
|
623 -- then we have the problem that the file does not contain the unit that
|
|
|
624 -- is needed. We simply treat this as a file not found condition.
|
|
|
625
|
|
|
626 -- We skip this test in multiple unit per file mode since in this
|
|
|
627 -- case we can have multiple units from the same source file.
|
|
|
628
|
|
|
629 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then
|
|
|
630 for J in Units.First .. Units.Last loop
|
|
|
631 if Fname = Units.Table (J).Unit_File_Name then
|
|
|
632 if Debug_Flag_L then
|
|
|
633 Write_Str (" file does not contain unit, Unit_Number = ");
|
|
|
634 Write_Int (Int (Unum));
|
|
|
635 Write_Eol;
|
|
|
636 Write_Eol;
|
|
|
637 end if;
|
|
|
638
|
|
|
639 if Present (Error_Node) then
|
|
|
640 Get_Name_String (Fname);
|
|
|
641
|
|
|
642 if Is_Predefined_File_Name (Fname) then
|
|
|
643 Error_Msg_Unit_1 := Uname_Actual;
|
|
|
644 Error_Msg
|
|
|
645 ("$$ is not a language defined unit", Load_Msg_Sloc);
|
|
|
646 else
|
|
|
647 Error_Msg_File_1 := Fname;
|
|
|
648 Error_Msg_Unit_1 := Uname_Actual;
|
|
|
649 Error_Msg ("File{ does not contain unit$", Load_Msg_Sloc);
|
|
|
650 end if;
|
|
|
651
|
|
|
652 Write_Dependency_Chain;
|
|
|
653 Unum := No_Unit;
|
|
|
654 goto Done;
|
|
|
655
|
|
|
656 else
|
|
|
657 Unum := No_Unit;
|
|
|
658 goto Done;
|
|
|
659 end if;
|
|
|
660 end if;
|
|
|
661 end loop;
|
|
|
662 end if;
|
|
|
663
|
|
|
664 -- If we are proceeding with load, then make load stack entry,
|
|
|
665 -- and indicate the kind of with_clause responsible for the load.
|
|
|
666
|
|
|
667 Load_Stack.Increment_Last;
|
|
|
668 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node);
|
|
|
669
|
|
|
670 -- Case of entry already in table
|
|
|
671
|
|
|
672 if Unum <= Units.Last then
|
|
|
673
|
|
|
674 -- Here is where we check for a circular dependency, which is
|
|
|
675 -- an attempt to load a unit which is currently in the process
|
|
|
676 -- of being loaded. We do *not* care about a circular chain that
|
|
|
677 -- leads back to a body, because this kind of circular dependence
|
|
|
678 -- legitimately occurs (e.g. two package bodies that contain
|
|
|
679 -- inlined subprogram referenced by the other).
|
|
|
680
|
|
|
681 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
|
|
|
682 -- their purpose is precisely to create legal circular structures.
|
|
|
683
|
|
|
684 if Loading (Unum)
|
|
|
685 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
|
|
|
686 or else Acts_As_Spec (Units.Table (Unum).Cunit))
|
|
|
687 and then (Nkind (Error_Node) /= N_With_Clause
|
|
|
688 or else not Limited_Present (Error_Node))
|
|
|
689 and then not From_Limited_With_Chain
|
|
|
690 then
|
|
|
691 if Debug_Flag_L then
|
|
|
692 Write_Str (" circular dependency encountered");
|
|
|
693 Write_Eol;
|
|
|
694 end if;
|
|
|
695
|
|
|
696 if Present (Error_Node) then
|
|
|
697 Error_Msg ("circular unit dependency", Load_Msg_Sloc);
|
|
|
698 Write_Dependency_Chain;
|
|
|
699 else
|
|
|
700 Load_Stack.Decrement_Last;
|
|
|
701 end if;
|
|
|
702
|
|
|
703 Unum := No_Unit;
|
|
|
704 goto Done;
|
|
|
705 end if;
|
|
|
706
|
|
|
707 if Debug_Flag_L then
|
|
|
708 Write_Str (" unit already in file table, Unit_Number = ");
|
|
|
709 Write_Int (Int (Unum));
|
|
|
710 Write_Eol;
|
|
|
711 end if;
|
|
|
712
|
|
|
713 Load_Stack.Decrement_Last;
|
|
|
714 goto Done;
|
|
|
715
|
|
|
716 -- Unit is not already in table, so try to open the file
|
|
|
717
|
|
|
718 else
|
|
|
719 if Debug_Flag_L then
|
|
|
720 Write_Str (" attempt unit load, Unit_Number = ");
|
|
|
721 Write_Int (Int (Unum));
|
|
|
722 Write_Eol;
|
|
|
723 end if;
|
|
|
724
|
|
|
725 Src_Ind := Load_Source_File (Fname);
|
|
|
726
|
|
|
727 -- Make a partial entry in the file table, used even in the file not
|
|
|
728 -- found case to print the dependency chain including the last entry
|
|
|
729
|
|
|
730 Units.Increment_Last;
|
|
145
|
731 Init_Unit_Name (Unum, Uname_Actual);
|
|
111
|
732
|
|
|
733 -- File was found
|
|
|
734
|
|
|
735 if Src_Ind > No_Source_File then
|
|
|
736 Units.Table (Unum) :=
|
|
|
737 (Cunit => Empty,
|
|
|
738 Cunit_Entity => Empty,
|
|
|
739 Dependency_Num => 0,
|
|
|
740 Dynamic_Elab => False,
|
|
|
741 Error_Location => Sloc (Error_Node),
|
|
|
742 Expected_Unit => Uname_Actual,
|
|
|
743 Fatal_Error => None,
|
|
|
744 Generate_Code => False,
|
|
|
745 Has_RACW => False,
|
|
|
746 Filler => False,
|
|
|
747 Ident_String => Empty,
|
|
|
748
|
|
|
749 Is_Predefined_Renaming => Ren_Name,
|
|
|
750 Is_Predefined_Unit => Pre_Name or Ren_Name,
|
|
|
751 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name,
|
|
|
752 Filler2 => False,
|
|
|
753
|
|
|
754 Loading => True,
|
|
|
755 Main_Priority => Default_Main_Priority,
|
|
|
756 Main_CPU => Default_Main_CPU,
|
|
|
757 Primary_Stack_Count => 0,
|
|
|
758 Sec_Stack_Count => 0,
|
|
|
759 Munit_Index => 0,
|
|
|
760 No_Elab_Code_All => False,
|
|
|
761 Serial_Number => 0,
|
|
|
762 Source_Index => Src_Ind,
|
|
|
763 Unit_File_Name => Fname,
|
|
|
764 Unit_Name => Uname_Actual,
|
|
|
765 Version => Source_Checksum (Src_Ind),
|
|
|
766 OA_Setting => 'O');
|
|
|
767
|
|
|
768 -- Parse the new unit
|
|
|
769
|
|
|
770 declare
|
|
|
771 Save_Index : constant Nat := Multiple_Unit_Index;
|
|
|
772 Save_PMES : constant Boolean := Parsing_Main_Extended_Source;
|
|
|
773
|
|
|
774 begin
|
|
|
775 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual);
|
|
|
776 Units.Table (Unum).Munit_Index := Multiple_Unit_Index;
|
|
|
777 Initialize_Scanner (Unum, Source_Index (Unum));
|
|
|
778
|
|
|
779 if Calling_Unit = Main_Unit and then Subunit then
|
|
|
780 Parsing_Main_Extended_Source := True;
|
|
|
781 end if;
|
|
|
782
|
|
|
783 Discard_List (Par (Configuration_Pragmas => False));
|
|
|
784
|
|
|
785 Parsing_Main_Extended_Source := Save_PMES;
|
|
|
786
|
|
|
787 Multiple_Unit_Index := Save_Index;
|
|
|
788 Set_Loading (Unum, False);
|
|
|
789 end;
|
|
|
790
|
|
|
791 -- If spec is irrelevant, then post errors and quit
|
|
|
792
|
|
|
793 if Corr_Body /= No_Unit
|
|
|
794 and then Spec_Is_Irrelevant (Unum, Corr_Body)
|
|
|
795 then
|
|
|
796 Error_Msg_File_1 := Unit_File_Name (Corr_Body);
|
|
|
797 Error_Msg
|
|
|
798 ("cannot compile subprogram in file {!", Load_Msg_Sloc);
|
|
|
799 Error_Msg_File_1 := Unit_File_Name (Unum);
|
|
|
800 Error_Msg
|
|
|
801 ("\incorrect spec in file { must be removed first!",
|
|
|
802 Load_Msg_Sloc);
|
|
|
803 Unum := No_Unit;
|
|
|
804 goto Done;
|
|
|
805 end if;
|
|
|
806
|
|
|
807 -- If loaded unit had an error, then caller inherits setting
|
|
|
808
|
|
|
809 if Present (Error_Node) then
|
|
|
810 case Units.Table (Unum).Fatal_Error is
|
|
|
811
|
|
|
812 -- Nothing to do if with'ed unit had no error
|
|
|
813
|
|
|
814 when None =>
|
|
|
815 null;
|
|
|
816
|
|
|
817 -- If with'ed unit had a detected fatal error, propagate it
|
|
|
818
|
|
|
819 when Error_Detected =>
|
|
|
820 Units.Table (Calling_Unit).Fatal_Error := Error_Detected;
|
|
|
821
|
|
|
822 -- If with'ed unit had an ignored error, then propagate it
|
|
|
823 -- but do not overide an existring setting.
|
|
|
824
|
|
|
825 when Error_Ignored =>
|
|
|
826 if Units.Table (Calling_Unit).Fatal_Error = None then
|
|
|
827 Units.Table (Calling_Unit).Fatal_Error :=
|
|
|
828 Error_Ignored;
|
|
|
829 end if;
|
|
|
830 end case;
|
|
|
831 end if;
|
|
|
832
|
|
|
833 -- Remove load stack entry and return the entry in the file table
|
|
|
834
|
|
|
835 Load_Stack.Decrement_Last;
|
|
|
836
|
|
|
837 -- All done, return unit number
|
|
|
838
|
|
|
839 goto Done;
|
|
|
840
|
|
|
841 -- Case of file not found
|
|
|
842
|
|
|
843 else
|
|
|
844 if Debug_Flag_L then
|
|
|
845 if Src_Ind = No_Access_To_Source_File then
|
|
|
846 Write_Str (" no read access to file, load failed");
|
|
|
847 else
|
|
|
848 Write_Str (" file was not found, load failed");
|
|
|
849 end if;
|
|
|
850
|
|
|
851 Write_Eol;
|
|
|
852 end if;
|
|
|
853
|
|
|
854 -- Generate message if unit required
|
|
|
855
|
|
|
856 if Required then
|
|
|
857 Get_Name_String (Fname);
|
|
|
858
|
|
|
859 if Is_Predefined_File_Name (Fname) then
|
|
|
860
|
|
|
861 -- This is a predefined library unit which is not present
|
|
|
862 -- in the run time. If a predefined unit is not available
|
|
|
863 -- it may very likely be the case that there is also pragma
|
|
|
864 -- Restriction forbidding its usage. This is typically the
|
|
|
865 -- case when building a configurable run time, where the
|
|
|
866 -- usage of certain run-time units is restricted by means
|
|
|
867 -- of both the corresponding pragma Restriction (such as
|
|
|
868 -- No_Calendar), and by not including the unit. Hence, we
|
|
|
869 -- check whether this predefined unit is forbidden, so that
|
|
|
870 -- the message about the restriction violation is generated,
|
|
|
871 -- if needed.
|
|
|
872
|
|
|
873 if Present (Error_Node) then
|
|
|
874 Check_Restricted_Unit (Load_Name, Error_Node);
|
|
|
875 end if;
|
|
|
876
|
|
|
877 Error_Msg_Unit_1 := Uname_Actual;
|
|
|
878 Error_Msg -- CODEFIX
|
|
|
879 ("$$ is not a predefined library unit", Load_Msg_Sloc);
|
|
|
880
|
|
|
881 else
|
|
|
882 Error_Msg_File_1 := Fname;
|
|
|
883
|
|
|
884 if Src_Ind = No_Access_To_Source_File then
|
|
|
885 Error_Msg ("no read access to file{", Load_Msg_Sloc);
|
|
|
886 else
|
|
|
887 Error_Msg ("file{ not found", Load_Msg_Sloc);
|
|
|
888 end if;
|
|
|
889 end if;
|
|
|
890
|
|
|
891 Write_Dependency_Chain;
|
|
|
892
|
|
|
893 -- Remove unit from stack, to avoid cascaded errors on
|
|
|
894 -- subsequent missing files.
|
|
|
895
|
|
|
896 Load_Stack.Decrement_Last;
|
|
145
|
897 Remove_Unit (Unum);
|
|
111
|
898
|
|
|
899 -- If unit not required, remove load stack entry and the junk
|
|
|
900 -- file table entry, and return No_Unit to indicate not found,
|
|
|
901
|
|
|
902 else
|
|
|
903 Load_Stack.Decrement_Last;
|
|
145
|
904 Remove_Unit (Unum);
|
|
111
|
905 end if;
|
|
|
906
|
|
|
907 Unum := No_Unit;
|
|
|
908 goto Done;
|
|
|
909 end if;
|
|
|
910 end if;
|
|
|
911
|
|
|
912 -- Here to exit, with result in Unum
|
|
|
913
|
|
|
914 <<Done>>
|
|
|
915 Parsing_Main_Extended_Source := Save_PMES;
|
|
|
916 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions);
|
|
|
917 return Unum;
|
|
|
918 end Load_Unit;
|
|
|
919
|
|
|
920 --------------------------
|
|
|
921 -- Make_Child_Decl_Unit --
|
|
|
922 --------------------------
|
|
|
923
|
|
|
924 procedure Make_Child_Decl_Unit (N : Node_Id) is
|
|
145
|
925 Unit_Decl : constant Node_Id := Library_Unit (N);
|
|
|
926 Unit_Num : constant Unit_Number_Type := Get_Cunit_Unit_Number (N);
|
|
111
|
927
|
|
|
928 begin
|
|
|
929 Units.Increment_Last;
|
|
145
|
930 Units.Table (Units.Last) := Units.Table (Unit_Num);
|
|
111
|
931 Units.Table (Units.Last).Cunit := Unit_Decl;
|
|
|
932 Units.Table (Units.Last).Cunit_Entity :=
|
|
|
933 Defining_Identifier
|
|
|
934 (Defining_Unit_Name (Specification (Unit (Unit_Decl))));
|
|
145
|
935 Init_Unit_Name (Units.Last, Get_Spec_Name (Unit_Name (Unit_Num)));
|
|
111
|
936
|
|
|
937 -- The library unit created for of a child subprogram unit plays no
|
|
|
938 -- role in code generation and binding, so label it accordingly.
|
|
|
939
|
|
|
940 Units.Table (Units.Last).Generate_Code := False;
|
|
|
941 Set_Has_No_Elaboration_Code (Unit_Decl);
|
|
|
942 end Make_Child_Decl_Unit;
|
|
|
943
|
|
|
944 ------------------------
|
|
|
945 -- Make_Instance_Unit --
|
|
|
946 ------------------------
|
|
|
947
|
|
|
948 -- If the unit is an instance, it appears as a package declaration, but
|
|
|
949 -- contains both declaration and body of the instance. The body becomes
|
|
|
950 -- the main unit of the compilation, and the declaration is inserted
|
|
|
951 -- at the end of the unit table. The main unit now has the name of a
|
|
|
952 -- body, which is constructed from the name of the original spec,
|
|
|
953 -- and is attached to the compilation node of the original unit. The
|
|
|
954 -- declaration has been attached to a new compilation unit node, and
|
|
|
955 -- code will have to be generated for it.
|
|
|
956
|
|
|
957 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is
|
|
|
958 Sind : constant Source_File_Index := Source_Index (Main_Unit);
|
|
|
959
|
|
|
960 begin
|
|
|
961 Units.Increment_Last;
|
|
|
962
|
|
|
963 if In_Main then
|
|
|
964 Units.Table (Units.Last) := Units.Table (Main_Unit);
|
|
|
965 Units.Table (Units.Last).Cunit := Library_Unit (N);
|
|
|
966 Units.Table (Units.Last).Generate_Code := True;
|
|
145
|
967 Init_Unit_Name (Units.Last, Unit_Name (Main_Unit));
|
|
|
968
|
|
111
|
969 Units.Table (Main_Unit).Cunit := N;
|
|
145
|
970 Units.Table (Main_Unit).Version := Source_Checksum (Sind);
|
|
|
971 Init_Unit_Name (Main_Unit,
|
|
111
|
972 Get_Body_Name
|
|
145
|
973 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N)))));
|
|
111
|
974
|
|
|
975 else
|
|
|
976 -- Duplicate information from instance unit, for the body. The unit
|
|
|
977 -- node N has been rewritten as a body, but it was placed in the
|
|
|
978 -- units table when first loaded as a declaration.
|
|
|
979
|
|
|
980 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N));
|
|
|
981 Units.Table (Units.Last).Cunit := Library_Unit (N);
|
|
|
982 end if;
|
|
|
983 end Make_Instance_Unit;
|
|
|
984
|
|
|
985 ------------------------
|
|
|
986 -- Spec_Is_Irrelevant --
|
|
|
987 ------------------------
|
|
|
988
|
|
|
989 function Spec_Is_Irrelevant
|
|
|
990 (Spec_Unit : Unit_Number_Type;
|
|
|
991 Body_Unit : Unit_Number_Type) return Boolean
|
|
|
992 is
|
|
|
993 Sunit : constant Node_Id := Cunit (Spec_Unit);
|
|
|
994 Bunit : constant Node_Id := Cunit (Body_Unit);
|
|
|
995
|
|
|
996 begin
|
|
|
997 -- The spec is irrelevant if the body is a subprogram body, and the spec
|
|
|
998 -- is other than a subprogram spec or generic subprogram spec. Note that
|
|
|
999 -- the names must be the same, we don't need to check that, because we
|
|
|
1000 -- already know that from the fact that the file names are the same.
|
|
|
1001
|
|
|
1002 return
|
|
|
1003 Nkind (Unit (Bunit)) = N_Subprogram_Body
|
|
|
1004 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
|
|
|
1005 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
|
|
|
1006 end Spec_Is_Irrelevant;
|
|
|
1007
|
|
|
1008 --------------------
|
|
|
1009 -- Version_Update --
|
|
|
1010 --------------------
|
|
|
1011
|
|
|
1012 procedure Version_Update (U : Node_Id; From : Node_Id) is
|
|
|
1013 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
|
|
|
1014 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
|
|
|
1015 begin
|
|
|
1016 if Source_Index (Fnum) > No_Source_File then
|
|
|
1017 Units.Table (Unum).Version :=
|
|
|
1018 Units.Table (Unum).Version
|
|
|
1019 xor
|
|
|
1020 Source_Checksum (Source_Index (Fnum));
|
|
|
1021 end if;
|
|
|
1022 end Version_Update;
|
|
|
1023
|
|
|
1024 ----------------------------
|
|
|
1025 -- Write_Dependency_Chain --
|
|
|
1026 ----------------------------
|
|
|
1027
|
|
|
1028 procedure Write_Dependency_Chain is
|
|
|
1029 begin
|
|
|
1030 -- The dependency chain is only written if it is at least two entries
|
|
|
1031 -- deep, otherwise it is trivial (the main unit depending on a unit
|
|
|
1032 -- that it obviously directly depends on).
|
|
|
1033
|
|
|
1034 if Load_Stack.Last - 1 > Load_Stack.First then
|
|
|
1035 for U in Load_Stack.First .. Load_Stack.Last - 1 loop
|
|
|
1036 Error_Msg_Unit_1 :=
|
|
|
1037 Unit_Name (Load_Stack.Table (U).Unit_Number);
|
|
|
1038 Error_Msg_Unit_2 :=
|
|
|
1039 Unit_Name (Load_Stack.Table (U + 1).Unit_Number);
|
|
|
1040 Error_Msg ("$ depends on $!", Load_Msg_Sloc);
|
|
|
1041 end loop;
|
|
|
1042 end if;
|
|
|
1043 end Write_Dependency_Chain;
|
|
|
1044
|
|
|
1045 end Lib.Load;
|
