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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 -- R E S T R I C T --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, 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 -- This package deals with the implementation of the Restrictions pragma
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27
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28 with Aspects; use Aspects;
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29 with Namet; use Namet;
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30 with Rident; use Rident;
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31 with Snames; use Snames;
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32 with Table;
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33 with Types; use Types;
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34 with Uintp; use Uintp;
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35
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36 package Restrict is
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37
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38 Restrictions : Restrictions_Info := No_Restrictions;
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39 -- This variable records restrictions found in any units in the main
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40 -- extended unit, and in the case of restrictions checked for partition
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41 -- consistency, restrictions found in any with'ed units, parent specs
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42 -- etc., since we may as well check as much as we can at compile time.
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43 -- These variables should not be referenced directly by clients. Instead
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44 -- use Check_Restriction to record a violation of a restriction, and
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45 -- Restriction_Active to test if a given restriction is active.
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46
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47 Restrictions_Loc : array (All_Restrictions) of Source_Ptr :=
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48 (others => No_Location);
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49 -- Locations of Restrictions pragmas for error message purposes.
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50 -- Valid only if corresponding entry in Restrictions is set. A value
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51 -- of No_Location is used for implicit restrictions set by another
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52 -- pragma, and a value of System_Location is used for restrictions
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53 -- set from package Standard by the processing in Targparm.
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54
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55 Restriction_Profile_Name : array (All_Restrictions) of Profile_Name;
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56 -- Entries in this array are valid only if the corresponding restriction in
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57 -- Restrictions is set. The value is the corresponding profile name if the
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58 -- restriction was set by a Profile or Profile_Warnings pragma. The value
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59 -- is No_Profile in all other cases.
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60
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61 Main_Restrictions : Restrictions_Info := No_Restrictions;
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62 -- This variable records only restrictions found in any units of the
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63 -- main extended unit. These are the variables used for ali file output,
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64 -- since we want the binder to be able to accurately diagnose inter-unit
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65 -- restriction violations.
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66
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67 Restriction_Warnings : Rident.Restriction_Flags := (others => False);
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68 -- If one of these flags is set, then it means that violation of the
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69 -- corresponding restriction results only in a warning message, not
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70 -- in an error message, and the restriction is not otherwise enforced.
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71 -- Note that the flags in Restrictions are set to indicate that the
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72 -- restriction is set in this case, but Main_Restrictions is never
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73 -- set if Restriction_Warnings is set, so this does not look like a
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74 -- restriction to the binder.
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75
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76 -- The following declarations establish a mapping between restriction
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77 -- identifiers, and the names of corresponding restricted library units.
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78
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79 type Unit_Entry is record
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80 Res_Id : Restriction_Id;
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81 Filenm : String (1 .. 8);
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82 end record;
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83
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84 Unit_Array : constant array (Positive range <>) of Unit_Entry := (
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85 (No_Asynchronous_Control, "a-astaco"),
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86 (No_Calendar, "a-calend"),
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87 (No_Calendar, "calendar"),
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88 (No_Delay, "a-calend"),
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89 (No_Delay, "calendar"),
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90 (No_Dynamic_Priorities, "a-dynpri"),
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91 (No_Finalization, "a-finali"),
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92 (No_IO, "a-direio"),
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93 (No_IO, "directio"),
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94 (No_IO, "a-sequio"),
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95 (No_IO, "sequenio"),
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96 (No_IO, "a-ststio"),
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97 (No_IO, "a-textio"),
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98 (No_IO, "text_io "),
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99 (No_IO, "a-witeio"),
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100 (No_Task_Attributes_Package, "a-tasatt"),
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101 (No_Unchecked_Conversion, "a-unccon"),
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102 (No_Unchecked_Conversion, "unchconv"),
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103 (No_Unchecked_Deallocation, "a-uncdea"),
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104 (No_Unchecked_Deallocation, "unchdeal"));
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105
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106 -- The following map has True for all GNAT-defined Restrictions. It is used
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107 -- to implement pragma Restrictions (No_Implementation_Restrictions) (which
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108 -- is why this restriction itself is excluded from the list).
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109
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110 Implementation_Restriction : constant array (All_Restrictions) of Boolean :=
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111 (Simple_Barriers => True,
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112 No_Calendar => True,
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113 No_Default_Initialization => True,
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114 No_Direct_Boolean_Operators => True,
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115 No_Dispatching_Calls => True,
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116 No_Dynamic_Attachment => True,
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117 No_Elaboration_Code => True,
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118 No_Enumeration_Maps => True,
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119 No_Entry_Calls_In_Elaboration_Code => True,
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120 No_Entry_Queue => True,
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121 No_Exception_Handlers => True,
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122 No_Exception_Propagation => True,
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123 No_Exception_Registration => True,
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124 No_Finalization => True,
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125 No_Fixed_IO => True,
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126 No_Implementation_Attributes => True,
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127 No_Implementation_Pragmas => True,
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128 No_Implicit_Conditionals => True,
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129 No_Implicit_Aliasing => True,
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130 No_Implicit_Dynamic_Code => True,
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131 No_Implicit_Loops => True,
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132 No_Initialize_Scalars => True,
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133 No_Local_Protected_Objects => True,
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134 No_Long_Long_Integers => True,
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135 No_Multiple_Elaboration => True,
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136 No_Protected_Type_Allocators => True,
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137 No_Relative_Delay => True,
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138 No_Requeue_Statements => True,
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139 No_Secondary_Stack => True,
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140 No_Select_Statements => True,
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141 No_Standard_Storage_Pools => True,
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142 No_Stream_Optimizations => True,
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143 No_Streams => True,
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144 No_Task_Attributes_Package => True,
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145 No_Task_Termination => True,
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146 No_Tasking => True,
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147 No_Wide_Characters => True,
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148 Static_Priorities => True,
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149 Static_Storage_Size => True,
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150 Pure_Barriers => True,
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151 SPARK_05 => True,
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152 others => False);
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153
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154 --------------------------
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155 -- No_Dependences Table --
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156 --------------------------
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157
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158 -- The following table records entries made by Restrictions pragmas
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159 -- that specify a parameter for No_Dependence. Each such pragma makes
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160 -- an entry in this table.
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161
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162 -- Note: we have chosen to implement this restriction in the "syntactic"
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163 -- form, where we do not check that the named package is a language defined
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164 -- package, but instead we allow arbitrary package names. The discussion of
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165 -- this issue is not complete in the ARG, but the sense seems to be leaning
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166 -- in this direction, which makes more sense to us, since it is much more
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167 -- useful, and much easier to implement.
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168
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169 type ND_Entry is record
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170 Unit : Node_Id;
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171 -- The unit parameter from the No_Dependence pragma
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172
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173 Warn : Boolean;
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174 -- True if from Restriction_Warnings, False if from Restrictions
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175
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176 Profile : Profile_Name;
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177 -- Set to name of profile from which No_Dependence entry came, or to
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178 -- No_Profile if a pragma Restriction set the No_Dependence entry.
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179 end record;
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180
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181 package No_Dependences is new Table.Table (
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182 Table_Component_Type => ND_Entry,
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183 Table_Index_Type => Int,
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184 Table_Low_Bound => 0,
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185 Table_Initial => 200,
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186 Table_Increment => 200,
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187 Table_Name => "Name_No_Dependences");
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188
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189 ----------------------------
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190 -- No_Use_Of_Entity Table --
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191 ----------------------------
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192
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193 -- The following table records entries made by Restrictions pragmas
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194 -- that specify a parameter for No_Use_Of_Entity. Each such pragma makes
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195 -- an entry in this table.
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196
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197 -- Note: we have chosen to implement this restriction in the "syntactic"
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198 -- form, where we allow arbitrary fully qualified names to be specified.
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199
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200 type NE_Entry is record
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201 Entity : Node_Id;
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202 -- The entity parameter from the No_Use_Of_Entity pragma. This is in
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203 -- the form of a selected component, since that is the way the parser
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204 -- processes it, and we don't further analyze it.
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205
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206 Warn : Boolean;
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207 -- True if from Restriction_Warnings, False if from Restrictions
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208
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209 Profile : Profile_Name;
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210 -- Set to name of profile from which No_Use_Of_Entity entry came, or to
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211 -- No_Profile if a pragma Restriction set the No_Use_Of_Entity entry.
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212 end record;
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213
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214 package No_Use_Of_Entity is new Table.Table (
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215 Table_Component_Type => NE_Entry,
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216 Table_Index_Type => Int,
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217 Table_Low_Bound => 0,
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218 Table_Initial => 200,
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219 Table_Increment => 200,
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220 Table_Name => "Name_No_Use_Of_Entity");
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221
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222 -- Note that in addition to making an entry in this table, we also set the
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223 -- Boolean2 flag of the Name_Table entry for the simple name of the entity.
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224 -- This is used to avoid most useless searches of this table.
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225
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226 -----------------
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227 -- Subprograms --
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228 -----------------
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229
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230 -- Note: several of these subprograms can generate error messages (e.g.
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231 -- Check_Restriction). These routines should be called in the analyzer
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232 -- rather than the expander, so that the associated error messages are
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233 -- correctly generated in semantics only (-gnatc) mode.
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234
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235 function Abort_Allowed return Boolean;
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236 pragma Inline (Abort_Allowed);
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237 -- Tests to see if abort is allowed by the current restrictions settings.
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238 -- For abort to be allowed, either No_Abort_Statements must be False,
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239 -- or Max_Asynchronous_Select_Nesting must be non-zero.
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240
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241 procedure Check_Compiler_Unit (Feature : String; N : Node_Id);
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242 -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then
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243 -- a message is posted on node N noting use of the given feature is not
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244 -- permitted in the compiler (bootstrap considerations).
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245
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246 procedure Check_Compiler_Unit (Feature : String; Loc : Source_Ptr);
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247 -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then a
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248 -- message is posted at location Loc noting use of the given feature is not
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249 -- permitted in the compiler (bootstrap considerations).
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250
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251 procedure Check_Restricted_Unit (U : Unit_Name_Type; N : Node_Id);
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252 -- Checks if loading of unit U is prohibited by the setting of some
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253 -- restriction (e.g. No_IO restricts the loading of unit Ada.Text_IO).
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254 -- If a restriction exists post error message at the given node.
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255
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256 procedure Check_Restriction
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257 (Msg_Issued : out Boolean;
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258 R : Restriction_Id;
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259 N : Node_Id;
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260 V : Uint := Uint_Minus_1);
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261 -- Checks that the given restriction is not set, and if it is set, an
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262 -- appropriate message is posted on the given node, in which case
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263 -- Msg_Issued is set to True (and False otherwise). Also records the
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264 -- violation in the appropriate internal arrays. Note that it is mandatory
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265 -- to always use this routine to check if a restriction is violated. Such
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266 -- checks must never be done directly by the caller, since otherwise
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267 -- violations in the absence of restrictions are not properly recorded. The
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268 -- value of V is relevant only for parameter restrictions, and in this case
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269 -- indicates the exact count for the violation. If the exact count is not
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270 -- known, V is left at its default of -1 which indicates an unknown count.
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271
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272 procedure Check_Restriction
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273 (R : Restriction_Id;
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274 N : Node_Id;
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275 V : Uint := Uint_Minus_1);
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276 -- Wrapper on Check_Restriction with Msg_Issued, with the out-parameter
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277 -- being ignored here.
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278
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279 procedure Check_Restriction_No_Dependence (U : Node_Id; Err : Node_Id);
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280 -- Called when a dependence on a unit is created (either implicitly, or by
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281 -- an explicit WITH clause). U is a node for the unit involved, and Err is
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282 -- the node to which an error will be attached if necessary.
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283
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284 procedure Check_Restriction_No_Specification_Of_Aspect (N : Node_Id);
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285 -- N is the node id for an N_Aspect_Specification. An error message
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286 -- (warning) will be issued if a restriction (warning) was previously set
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287 -- for this aspect using Set_No_Specification_Of_Aspect.
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288
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289 procedure Check_Restriction_No_Use_Of_Attribute (N : Node_Id);
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290 -- N denotes an attribute definition clause or an attribute reference. An
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291 -- error message (warning) will be issued if a restriction (warning) was
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292 -- previously set for this attribute using Set_No_Use_Of_Attribute.
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293
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294 procedure Check_Restriction_No_Use_Of_Entity (N : Node_Id);
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295 -- N is the node id for an entity reference. An error message (warning)
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296 -- will be issued if a restriction (warning) was previously set for this
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297 -- entity name using Set_No_Use_Of_Entity.
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298
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299 procedure Check_Restriction_No_Use_Of_Pragma (N : Node_Id);
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300 -- N is the node of a pragma. An error message (warning) will be issued
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301 -- if a restriction (warning) was previously set for this pragma using
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302 -- Set_No_Use_Of_Pragma.
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303
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304 procedure Check_Elaboration_Code_Allowed (N : Node_Id);
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305 -- Tests to see if elaboration code is allowed by the current restrictions
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306 -- settings. This function is called by Gigi when it needs to define an
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307 -- elaboration routine. If elaboration code is not allowed, an error
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308 -- message is posted on the node given as argument.
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309
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310 procedure Check_SPARK_05_Restriction
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311 (Msg : String;
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312 N : Node_Id;
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313 Force : Boolean := False);
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314 -- Node N represents a construct not allowed in SPARK_05 mode. If this is
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315 -- a source node, or if the restriction is forced (Force = True), and
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316 -- the SPARK_05 restriction is set, then an error is issued on N. Msg
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317 -- is appended to the restriction failure message.
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318
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319 procedure Check_SPARK_05_Restriction
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320 (Msg1 : String;
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321 Msg2 : String;
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322 N : Node_Id);
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323 -- Same as Check_SPARK_05_Restriction except there is a continuation
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324 -- message Msg2 following the initial message Msg1.
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325
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326 procedure Check_No_Implicit_Aliasing (Obj : Node_Id);
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327 -- Obj is a node for which Is_Aliased_View is True, which is being used in
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328 -- a context (e.g. 'Access) where no implicit aliasing is allowed if the
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329 -- restriction No_Implicit_Aliasing is set. This procedure checks for the
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330 -- case where the restriction is active and Obj does not meet the required
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331 -- rules for avoiding implicit aliases, and issues a restriction message.
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332
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333 procedure Check_Implicit_Dynamic_Code_Allowed (N : Node_Id);
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334 -- Tests to see if dynamic code generation (dynamically generated
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335 -- trampolines, in particular) is allowed by the current restrictions
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336 -- settings. This function is called by Gigi when it needs to generate code
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337 -- that generates a trampoline. If not allowed, an error message is posted
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338 -- on the node given as argument.
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339
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340 procedure Check_No_Implicit_Heap_Alloc (N : Node_Id);
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341 -- Equivalent to Check_Restriction (No_Implicit_Heap_Allocations, N).
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342 -- Provided for easy use by back end, which has to check this restriction.
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343
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344 procedure Check_No_Implicit_Task_Alloc (N : Node_Id);
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345 -- Equivalent to Check_Restriction (No_Implicit_Task_Allocations, N).
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346 -- Provided for easy use by back end, which has to check this restriction.
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347
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348 procedure Check_No_Implicit_Protected_Alloc (N : Node_Id);
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349 -- Equivalent to:
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350 -- Check_Restriction (No_Implicit_Protected_Object_Allocations, N)
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351 -- Provided for easy use by back end, which has to check this restriction.
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352
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353 procedure Check_Obsolescent_2005_Entity (E : Entity_Id; N : Node_Id);
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354 -- This routine checks if the entity E is one of the obsolescent entries
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355 -- in Ada.Characters.Handling in Ada 2005 and No_Obsolescent_Features
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356 -- restriction is active. If so an appropriate message is given. N is
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357 -- the node on which the message is to be placed. It's a bit kludgy to
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358 -- have this highly specialized routine rather than some wonderful general
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359 -- mechanism (e.g. a special pragma) to handle this case, but there are
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360 -- only six cases, and it is not worth the effort to do something general.
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361
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362 procedure Check_Wide_Character_Restriction (E : Entity_Id; N : Node_Id);
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363 -- This procedure checks if the No_Wide_Character restriction is active,
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364 -- and if so, if N Comes_From_Source, and the root type of E is one of
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365 -- [Wide_]Wide_Character or [Wide_]Wide_String, then the restriction
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366 -- violation is recorded, and an appropriate message given.
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367
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368 function Get_Restriction_Id
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369 (N : Name_Id) return Restriction_Id;
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370 -- Given an identifier name, determines if it is a valid restriction
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371 -- identifier, and if so returns the corresponding Restriction_Id value,
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372 -- otherwise returns Not_A_Restriction_Id.
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373
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374 function OK_No_Dependence_Unit_Name (N : Node_Id) return Boolean;
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375 -- Used in checking No_Dependence argument of pragma Restrictions or
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376 -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns
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377 -- True if N has the proper form for a unit name, False otherwise.
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378
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379 function OK_No_Use_Of_Entity_Name (N : Node_Id) return Boolean;
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380 -- Used in checking No_Use_Of_Entity argument of pragma Restrictions or
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381 -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns
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382 -- True if N has the proper form for an entity name, False otherwise.
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383
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384 function Is_In_Hidden_Part_In_SPARK (Loc : Source_Ptr) return Boolean;
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385 -- Determine if given location is covered by a hidden region range in the
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386 -- SPARK hides table.
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387
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388 function No_Exception_Handlers_Set return Boolean;
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389 -- Test to see if current restrictions settings specify that no exception
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390 -- handlers are present. This function is called by Gigi when it needs to
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391 -- expand an AT END clean up identifier with no exception handler. True
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392 -- will be returned if the configurable run-time is activated, and either
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393 -- of the restrictions No_Exception_Handlers or No_Exception_Propagation is
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394 -- set. In the latter case, the source may contain handlers but they either
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395 -- get converted using the local goto transformation or deleted.
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396
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397 function No_Exception_Propagation_Active return Boolean;
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398 -- Test to see if current restrictions settings specify that no
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399 -- exception propagation is activated.
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400
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401 function Process_Restriction_Synonyms (N : Node_Id) return Name_Id;
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402 -- Id is a node whose Chars field contains the name of a restriction.
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403 -- If it is one of synonyms that we allow for historical purposes (for
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404 -- list see System.Rident), then the proper official name is returned.
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405
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406 function Restriction_Active (R : All_Restrictions) return Boolean;
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407 pragma Inline (Restriction_Active);
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408 -- Determines if a given restriction is active. This call should only be
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409 -- used where the compiled code depends on whether the restriction is
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410 -- active. Always use Check_Restriction to record a violation. Note that
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411 -- this returns False if we only have a Restriction_Warnings set, since
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412 -- restriction warnings should never affect generated code. If you want
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413 -- to know if a call to Check_Restriction is needed then use the function
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414 -- Restriction_Check_Required instead.
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415
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416 function Restriction_Check_Required (R : All_Restrictions) return Boolean;
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417 pragma Inline (Restriction_Check_Required);
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418 -- Determines if either a Restriction_Warnings or Restrictions pragma has
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419 -- been given for the specified restriction. If true, then a subsequent
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420 -- call to Check_Restriction is required if the restriction is violated.
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421 -- This must not be used to guard code generation that depends on whether
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422 -- a restriction is active (see Restriction_Active above). Typically it
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423 -- is used to avoid complex code to determine if a restriction is violated,
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424 -- executing this code only if needed.
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425
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426 function Restricted_Profile return Boolean;
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427 -- Tests if set of restrictions corresponding to Restricted_Tasking profile
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428 -- is currently in effect (set by pragma Profile, or by an appropriate set
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429 -- of individual Restrictions pragmas). Returns True only if all the
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430 -- required restrictions are set.
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431
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432 procedure Set_Hidden_Part_In_SPARK (Loc1, Loc2 : Source_Ptr);
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433 -- Insert a new hidden region range in the SPARK hides table. The effect
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434 -- is to hide any SPARK violation messages which are in the range Loc1 to
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435 -- Loc2-1 (i.e. Loc2 is the first location for reenabling checks).
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436
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437 procedure Set_Profile_Restrictions
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438 (P : Profile_Name;
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439 N : Node_Id;
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440 Warn : Boolean);
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441 -- Sets the set of restrictions associated with the given profile name. N
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442 -- is the node of the construct to which error messages are to be attached
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443 -- as required. Warn is set True for the case of Profile_Warnings where the
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444 -- restrictions are set as warnings rather than legality requirements, and
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445 -- is also True for Profile if the Treat_Restrictions_As_Warnings flag is
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446 -- set. It is false for Profile if this flag is not set.
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447
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448 procedure Set_Restriction
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449 (R : All_Boolean_Restrictions;
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450 N : Node_Id);
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451 -- N is a node (typically a pragma node) that has the effect of setting
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452 -- Boolean restriction R. The restriction is set in Restrictions, and
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453 -- also in Main_Restrictions if this is the main unit.
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454
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455 procedure Set_Restriction
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456 (R : All_Parameter_Restrictions;
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457 N : Node_Id;
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458 V : Integer);
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459 -- Similar to the above, except that this is used for the case of a
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460 -- parameter restriction, and the corresponding value V is given.
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461
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462 procedure Set_Restriction_No_Dependence
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463 (Unit : Node_Id;
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464 Warn : Boolean;
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465 Profile : Profile_Name := No_Profile);
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466 -- Sets given No_Dependence restriction in table if not there already. Warn
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467 -- is True if from Restriction_Warnings, or for Restrictions if the flag
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468 -- Treat_Restrictions_As_Warnings is set. False if from Restrictions and
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469 -- this flag is not set. Profile is set to a non-default value if the
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470 -- No_Dependence restriction comes from a Profile pragma.
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471
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472 procedure Set_Restriction_No_Specification_Of_Aspect
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473 (N : Node_Id;
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474 Warning : Boolean);
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475 -- N is the node id for an identifier from a pragma Restrictions for the
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476 -- No_Specification_Of_Aspect pragma. An error message will be issued if
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477 -- the identifier is not a valid aspect name. Warning is set True for the
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478 -- case of a Restriction_Warnings pragma specifying this restriction and
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479 -- False for a Restrictions pragma specifying this restriction.
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480
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481 procedure Set_Restriction_No_Specification_Of_Aspect (A_Id : Aspect_Id);
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482 -- Version used by Get_Target_Parameters (via Tbuild)
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483
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484 procedure Set_Restriction_No_Use_Of_Attribute
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485 (N : Node_Id;
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486 Warning : Boolean);
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487 -- N is the node id for the identifier in a pragma Restrictions for
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488 -- No_Use_Of_Attribute. Caller has verified that this is a valid attribute
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489 -- designator.
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490
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491 procedure Set_Restriction_No_Use_Of_Attribute (A_Id : Attribute_Id);
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492 -- Version used by Get_Target_Parameters (via Tbuild)
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493
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494 procedure Set_Restriction_No_Use_Of_Entity
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495 (Entity : Node_Id;
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496 Warning : Boolean;
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497 Profile : Profile_Name := No_Profile);
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498 -- Sets given No_Use_Of_Entity restriction in table if not there already.
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499 -- Warn is True if from Restriction_Warnings, or for Restrictions if the
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500 -- flag Treat_Restrictions_As_Warnings is set. False if from Restrictions
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501 -- and this flag is not set. Profile is set to a non-default value if the
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502 -- No_Dependence restriction comes from a Profile pragma. This procedure
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503 -- also takes care of setting the Boolean2 flag of the simple name for
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504 -- the entity (to optimize table searches).
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505
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506 procedure Set_Restriction_No_Use_Of_Pragma
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507 (N : Node_Id;
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508 Warning : Boolean);
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509 -- N is the node id for the identifier in a pragma Restrictions for
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510 -- No_Use_Of_Pragma. Caller has verified that this is a valid pragma id.
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511
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512 procedure Set_Restriction_No_Use_Of_Pragma (A_Id : Pragma_Id);
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513 -- Version used in call from Get_Target_Parameters (via Tbuild).
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514
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515 function Tasking_Allowed return Boolean;
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516 pragma Inline (Tasking_Allowed);
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517 -- Tests if tasking operations are allowed by the current restrictions
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518 -- settings. For tasking to be allowed Max_Tasks must be non-zero.
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519
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520 ----------------------------------------------
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521 -- Handling of Boolean Compilation Switches --
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522 ----------------------------------------------
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523
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524 -- The following declarations are used for proper saving and restoring of
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525 -- restrictions for separate compilation units. There are two cases:
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526
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527 -- For partition-wide restrictions, we just let the restrictions pragmas
|
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528 -- pile up, and we never reset them. We might as well detect what we can
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529 -- at compile time. If e.g. a with'ed unit has a restriction for one of
|
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530 -- the partition-wide restrictions, then the binder will enforce it on
|
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531 -- all units in the partition, including the unit with the WITH. Although
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532 -- it would not be wrong to leave this till bind time, we might as well
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533 -- flag it earlier at compile time.
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534
|
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535 -- For non-partition-wide restrictions, we have quite a different state
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536 -- of affairs. Here it would be quite wrong to carry a restriction from
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537 -- a with'ed unit to another with'ed unit, or from a package spec to the
|
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538 -- package body. This means that we have to reset these non-partition
|
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539 -- wide restrictions at the start of each separate compilation unit. For
|
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540 -- units in the extended main program, we need to reset them all to the
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|
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541 -- values set by the configuration pragma file(s). For units not in the
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542 -- extended main program, e.g. with'ed units, we might as well reset all
|
|
|
543 -- of these restrictions to off (False). The actual initial values will
|
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544 -- be taken from the config files active when those units are compiled
|
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|
545 -- as main units.
|
|
|
546
|
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|
547 type Save_Cunit_Boolean_Restrictions is private;
|
|
|
548 -- Type used for saving and restoring compilation unit restrictions.
|
|
|
549
|
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|
550 function Cunit_Boolean_Restrictions_Save
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|
|
551 return Save_Cunit_Boolean_Restrictions;
|
|
|
552 -- This function saves the compilation unit restriction settings, leaving
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|
553 -- them unchanged. This is used e.g. at the start of processing a context
|
|
|
554 -- clause, so that the main unit restrictions can be restored after all
|
|
|
555 -- the with'ed units have been processed.
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|
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556
|
|
|
557 procedure Cunit_Boolean_Restrictions_Restore
|
|
|
558 (R : Save_Cunit_Boolean_Restrictions);
|
|
|
559 -- This is the corresponding restore procedure to restore restrictions
|
|
|
560 -- previously saved by Cunit_Boolean_Restrictions_Save. However it does
|
|
|
561 -- not reset No_Elaboration_Code, this stays set if it was set before
|
|
|
562 -- the call, and also if it is set before the call, then the Config
|
|
|
563 -- setting is also updated to include this restriction. This is what
|
|
|
564 -- implements the special handling of No_Elaboration_Code.
|
|
|
565
|
|
|
566 procedure Save_Config_Cunit_Boolean_Restrictions;
|
|
|
567 -- This saves the current compilation unit restrictions in an internal
|
|
|
568 -- variable, and leaves them unchanged. This is called immediately after
|
|
|
569 -- processing the configuration file pragmas, to record the restrictions
|
|
|
570 -- set by these configuration file pragmas.
|
|
|
571
|
|
|
572 procedure Restore_Config_Cunit_Boolean_Restrictions;
|
|
|
573 -- This restores the value saved by the previous call to save config values
|
|
|
574 -- saved by Save_Config_Cunit_Boolean_Restrictions. It is called at the
|
|
|
575 -- start of processing a new unit that is part of the main sources (e.g.
|
|
|
576 -- a package spec when the main unit is a package body).
|
|
|
577
|
|
|
578 procedure Reset_Cunit_Boolean_Restrictions;
|
|
|
579 -- Turns off all non-partition-wide boolean restrictions
|
|
|
580
|
|
|
581 procedure Add_To_Config_Boolean_Restrictions (R : Restriction_Id);
|
|
|
582 -- Add specified restriction to stored configuration boolean restrictions.
|
|
|
583 -- This is used for handling the special case of No_Elaboration_Code.
|
|
|
584
|
|
|
585 private
|
|
|
586 type Save_Cunit_Boolean_Restrictions is
|
|
|
587 array (Cunit_Boolean_Restrictions) of Boolean;
|
|
|
588 -- Type used for saving and restoring compilation unit restrictions.
|
|
|
589 -- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
|
|
|
590
|
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|
591 end Restrict;
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