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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M --
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6 -- --
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7 -- S p e c --
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8 -- (Compiler Version) --
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9 -- --
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131
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10 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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11 -- --
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12 -- This specification is derived from the Ada Reference Manual for use with --
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13 -- GNAT. The copyright notice above, and the license provisions that follow --
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14 -- apply solely to the contents of the part following the private keyword. --
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15 -- --
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16 -- GNAT is free software; you can redistribute it and/or modify it under --
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17 -- terms of the GNU General Public License as published by the Free Soft- --
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18 -- ware Foundation; either version 3, or (at your option) any later ver- --
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19 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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20 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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21 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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22 -- --
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23 -- As a special exception under Section 7 of GPL version 3, you are granted --
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24 -- additional permissions described in the GCC Runtime Library Exception, --
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25 -- version 3.1, as published by the Free Software Foundation. --
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26 -- --
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27 -- You should have received a copy of the GNU General Public License and --
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28 -- a copy of the GCC Runtime Library Exception along with this program; --
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29 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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30 -- <http://www.gnu.org/licenses/>. --
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31 -- --
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32 -- GNAT was originally developed by the GNAT team at New York University. --
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33 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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34 -- --
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35 ------------------------------------------------------------------------------
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36
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37 -- This version of System is a generic version that is used in building the
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38 -- compiler. Right now, we have a host/target problem if we try to use the
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39 -- "proper" System, and since the compiler itself does not care about most
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40 -- System parameters, this generic version works fine.
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41
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42 pragma Restrictions (No_Implicit_Dynamic_Code);
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43 -- We want to avoid trampolines in the compiler, so it can be used in systems
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44 -- which prevent execution of code on the stack, e.g. in windows environments
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45 -- with DEP (Data Execution Protection) enabled.
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46
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47 pragma Restrictions (No_Finalization);
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48 -- Use restriction No_Finalization to avoid pulling finalization (not allowed
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49 -- in GNAT) inside sem_spark.adb, when defining type Perm_Tree_Access as an
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50 -- access type on incomplete type Perm_Tree_Wrapper (which is required for
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51 -- defining a recursive type).
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52
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53 package System is
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54 pragma Pure;
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55 -- Note that we take advantage of the implementation permission to make
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56 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
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57 -- 2005, this is Pure in any case (AI-362).
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58
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59 pragma No_Elaboration_Code_All;
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60 -- Allow the use of that restriction in units that WITH this unit
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61
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62 type Name is (SYSTEM_NAME_GNAT);
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63 System_Name : constant Name := SYSTEM_NAME_GNAT;
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64
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65 -- System-Dependent Named Numbers
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66
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67 Min_Int : constant := Long_Long_Integer'First;
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68 Max_Int : constant := Long_Long_Integer'Last;
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69
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70 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
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71 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
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72
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73 Max_Base_Digits : constant := Long_Long_Float'Digits;
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74 Max_Digits : constant := Long_Long_Float'Digits;
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75
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76 Max_Mantissa : constant := 63;
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77 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
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78
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79 Tick : constant := 0.01;
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80
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81 -- Storage-related Declarations
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82
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83 type Address is private;
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84 -- Note that we do NOT add pragma Preelaborable_Initialization in this
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85 -- version of System, since it is used for the compiler only, and typical
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86 -- earlier bootstrap compilers don't support this pragma. We don't need
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87 -- it in this context, so there is no problem in omitting it.
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88 Null_Address : constant Address;
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89
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90 Storage_Unit : constant := Standard'Storage_Unit;
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91 Word_Size : constant := Standard'Word_Size;
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92 Memory_Size : constant := 2 ** Standard'Address_Size;
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93
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94 -- Address comparison
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95
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96 function "<" (Left, Right : Address) return Boolean;
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97 function "<=" (Left, Right : Address) return Boolean;
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98 function ">" (Left, Right : Address) return Boolean;
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99 function ">=" (Left, Right : Address) return Boolean;
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100 function "=" (Left, Right : Address) return Boolean;
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101
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102 pragma Import (Intrinsic, "<");
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103 pragma Import (Intrinsic, "<=");
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104 pragma Import (Intrinsic, ">");
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105 pragma Import (Intrinsic, ">=");
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106 pragma Import (Intrinsic, "=");
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107
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108 -- Other System-Dependent Declarations
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109
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110 type Bit_Order is (High_Order_First, Low_Order_First);
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111 Default_Bit_Order : constant Bit_Order :=
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112 Bit_Order'Val (Standard'Default_Bit_Order);
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113 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
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114
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115 -- Priority-related Declarations (RM D.1)
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116
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117 Max_Priority : constant Positive := 30;
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118 Max_Interrupt_Priority : constant Positive := 31;
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119
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120 subtype Any_Priority is Integer range 0 .. 31;
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121 subtype Priority is Any_Priority range 0 .. 30;
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122 subtype Interrupt_Priority is Any_Priority range 31 .. 31;
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123
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124 Default_Priority : constant Priority := 15;
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125
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126 private
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127
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128 type Address is mod Memory_Size;
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129 Null_Address : constant Address := 0;
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130
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131 --------------------------------------
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132 -- System Implementation Parameters --
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133 --------------------------------------
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134
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135 -- These parameters provide information about the target that is used by
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136 -- the compiler. They are in the private part of System, where they can be
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137 -- accessed using the special circuitry in the Targparm unit whose source
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138 -- should be consulted for more detailed descriptions of the individual
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139 -- switch values.
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140
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141 -- This version of system.ads is used only for building the compiler.
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142 -- We really ought to use the proper target system (i.e. the one that
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143 -- corresponds to the host for the compiler), but that causes as yet
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144 -- unsolved makefile problems. For the most part the setting of these
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145 -- parameters is not too critical for the compiler version (e.g. we
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146 -- do not use floating-point anyway in the compiler).
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147
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148 AAMP : constant Boolean := False;
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149 Backend_Divide_Checks : constant Boolean := False;
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150 Backend_Overflow_Checks : constant Boolean := False;
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151 Command_Line_Args : constant Boolean := True;
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152 Configurable_Run_Time : constant Boolean := False;
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153 Denorm : constant Boolean := True;
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154 Duration_32_Bits : constant Boolean := False;
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155 Exit_Status_Supported : constant Boolean := True;
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156 Fractional_Fixed_Ops : constant Boolean := False;
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157 Frontend_Layout : constant Boolean := False;
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158 Machine_Overflows : constant Boolean := False;
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159 Machine_Rounds : constant Boolean := True;
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160 Preallocated_Stacks : constant Boolean := False;
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161 Signed_Zeros : constant Boolean := True;
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162 Stack_Check_Default : constant Boolean := False;
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163 Stack_Check_Probes : constant Boolean := False;
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164 Stack_Check_Limits : constant Boolean := False;
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165 Support_Aggregates : constant Boolean := True;
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166 Support_Composite_Assign : constant Boolean := True;
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167 Support_Composite_Compare : constant Boolean := True;
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168 Support_Long_Shifts : constant Boolean := True;
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169 Always_Compatible_Rep : constant Boolean := True;
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170 Suppress_Standard_Library : constant Boolean := False;
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171 Use_Ada_Main_Program_Name : constant Boolean := False;
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172 Frontend_Exceptions : constant Boolean := False;
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173 ZCX_By_Default : constant Boolean := True;
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174
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175 -- Obsolete entries, to be removed eventually (bootstrap issues)
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176
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177 Front_End_ZCX_Support : constant Boolean := False;
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178 High_Integrity_Mode : constant Boolean := False;
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179 Long_Shifts_Inlined : constant Boolean := True;
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180 Functions_Return_By_DSP : constant Boolean := False;
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181 Support_64_Bit_Divides : constant Boolean := True;
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182 GCC_ZCX_Support : constant Boolean := True;
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183
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184 end System;
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