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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 -- S Y S T E M . S T A N D A R D _ L I B R A R Y --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package is included in all programs. It contains declarations that
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33 -- are required to be part of every Ada program. A special mechanism is
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34 -- required to ensure that these are loaded, since it may be the case in
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35 -- some programs that the only references to these required packages are
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36 -- from C code or from code generated directly by Gigi, and in both cases
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37 -- the binder is not aware of such references.
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38
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39 -- System.Standard_Library also includes data that must be present in every
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40 -- program, in particular data for all the standard exceptions, and also some
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41 -- subprograms that must be present in every program.
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42
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43 -- The binder unconditionally includes s-stalib.ali, which ensures that this
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44 -- package and the packages it references are included in all Ada programs,
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45 -- together with the included data.
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46
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47 pragma Compiler_Unit_Warning;
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48
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49 pragma Polling (Off);
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50 -- We must turn polling off for this unit, because otherwise we get
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51 -- elaboration circularities with Ada.Exceptions if polling is on.
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52
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53 with Ada.Unchecked_Conversion;
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54
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55 package System.Standard_Library is
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56
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57 -- Historical note: pragma Preelaborate was surrounded by a pair of pragma
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58 -- Warnings (Off/On) to circumvent a bootstrap issue.
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59
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60 pragma Preelaborate;
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61
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62 subtype Big_String is String (1 .. Positive'Last);
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63 pragma Suppress_Initialization (Big_String);
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64 -- Type used to obtain string access to given address. Initialization is
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65 -- suppressed, since we never want to have variables of this type, and
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66 -- we never want to attempt initialiazation of virtual variables of this
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67 -- type (e.g. when pragma Normalize_Scalars is used).
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68
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69 type Big_String_Ptr is access all Big_String;
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70 for Big_String_Ptr'Storage_Size use 0;
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71 -- We use this access type to pass a pointer to an area of storage to be
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72 -- accessed as a string. Of course when this pointer is used, it is the
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73 -- responsibility of the accessor to ensure proper bounds. The storage
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74 -- size clause ensures we do not allocate variables of this type.
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75
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76 function To_Ptr is
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77 new Ada.Unchecked_Conversion (System.Address, Big_String_Ptr);
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78
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79 -------------------------------------
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80 -- Exception Declarations and Data --
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81 -------------------------------------
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82
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83 type Raise_Action is access procedure;
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84 -- A pointer to a procedure used in the Raise_Hook field
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85
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86 type Exception_Data;
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87 type Exception_Data_Ptr is access all Exception_Data;
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88 -- An equivalent of Exception_Id that is public
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89
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90 -- The following record defines the underlying representation of exceptions
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91
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92 -- WARNING: Any changes to this may need to be reflected in the following
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93 -- locations in the compiler and runtime code:
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94
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95 -- 1. The Internal_Exception routine in s-exctab.adb
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96 -- 2. The processing in gigi that tests Not_Handled_By_Others
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97 -- 3. Expand_N_Exception_Declaration in Exp_Ch11
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98 -- 4. The construction of the exception type in Cstand
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99
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100 type Exception_Data is record
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101 Not_Handled_By_Others : Boolean;
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102 -- Normally set False, indicating that the exception is handled in the
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103 -- usual way by others (i.e. an others handler handles the exception).
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104 -- Set True to indicate that this exception is not caught by others
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105 -- handlers, but must be explicitly named in a handler. This latter
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106 -- setting is currently used by the Abort_Signal.
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107
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108 Lang : Character;
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109 -- A character indicating the language raising the exception.
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110 -- Set to "A" for exceptions defined by an Ada program.
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111 -- Set to "C" for imported C++ exceptions.
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112
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113 Name_Length : Natural;
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114 -- Length of fully expanded name of exception
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115
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116 Full_Name : System.Address;
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117 -- Fully expanded name of exception, null terminated
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118 -- You can use To_Ptr to convert this to a string.
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119
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120 HTable_Ptr : Exception_Data_Ptr;
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121 -- Hash table pointer used to link entries together in the hash table
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122 -- built (by Register_Exception in s-exctab.adb) for converting between
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123 -- identities and names.
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124
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125 Foreign_Data : Address;
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126 -- Data for imported exceptions. Not used in the Ada case. This
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127 -- represents the address of the RTTI for the C++ case.
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128
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129 Raise_Hook : Raise_Action;
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130 -- This field can be used to place a "hook" on an exception. If the
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131 -- value is non-null, then it points to a procedure which is called
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132 -- whenever the exception is raised. This call occurs immediately,
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133 -- before any other actions taken by the raise (and in particular
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134 -- before any unwinding of the stack occurs).
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135 end record;
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136
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137 -- Definitions for standard predefined exceptions defined in Standard,
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138
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139 -- Why are the NULs necessary here, seems like they should not be
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140 -- required, since Gigi is supposed to add a Nul to each name ???
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141
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142 Constraint_Error_Name : constant String := "CONSTRAINT_ERROR" & ASCII.NUL;
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143 Program_Error_Name : constant String := "PROGRAM_ERROR" & ASCII.NUL;
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144 Storage_Error_Name : constant String := "STORAGE_ERROR" & ASCII.NUL;
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145 Tasking_Error_Name : constant String := "TASKING_ERROR" & ASCII.NUL;
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146 Abort_Signal_Name : constant String := "_ABORT_SIGNAL" & ASCII.NUL;
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147
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148 Numeric_Error_Name : constant String := "NUMERIC_ERROR" & ASCII.NUL;
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149 -- This is used only in the Ada 83 case, but it is not worth having a
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150 -- separate version of s-stalib.ads for use in Ada 83 mode.
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151
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152 Constraint_Error_Def : aliased Exception_Data :=
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153 (Not_Handled_By_Others => False,
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154 Lang => 'A',
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155 Name_Length => Constraint_Error_Name'Length,
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156 Full_Name => Constraint_Error_Name'Address,
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157 HTable_Ptr => null,
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158 Foreign_Data => Null_Address,
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159 Raise_Hook => null);
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160
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161 Numeric_Error_Def : aliased Exception_Data :=
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162 (Not_Handled_By_Others => False,
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163 Lang => 'A',
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164 Name_Length => Numeric_Error_Name'Length,
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165 Full_Name => Numeric_Error_Name'Address,
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166 HTable_Ptr => null,
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167 Foreign_Data => Null_Address,
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168 Raise_Hook => null);
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169
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170 Program_Error_Def : aliased Exception_Data :=
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171 (Not_Handled_By_Others => False,
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172 Lang => 'A',
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173 Name_Length => Program_Error_Name'Length,
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174 Full_Name => Program_Error_Name'Address,
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175 HTable_Ptr => null,
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176 Foreign_Data => Null_Address,
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177 Raise_Hook => null);
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178
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179 Storage_Error_Def : aliased Exception_Data :=
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180 (Not_Handled_By_Others => False,
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181 Lang => 'A',
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182 Name_Length => Storage_Error_Name'Length,
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183 Full_Name => Storage_Error_Name'Address,
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184 HTable_Ptr => null,
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185 Foreign_Data => Null_Address,
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186 Raise_Hook => null);
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187
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188 Tasking_Error_Def : aliased Exception_Data :=
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189 (Not_Handled_By_Others => False,
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190 Lang => 'A',
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191 Name_Length => Tasking_Error_Name'Length,
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192 Full_Name => Tasking_Error_Name'Address,
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193 HTable_Ptr => null,
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194 Foreign_Data => Null_Address,
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195 Raise_Hook => null);
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196
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197 Abort_Signal_Def : aliased Exception_Data :=
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198 (Not_Handled_By_Others => True,
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199 Lang => 'A',
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200 Name_Length => Abort_Signal_Name'Length,
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201 Full_Name => Abort_Signal_Name'Address,
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202 HTable_Ptr => null,
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203 Foreign_Data => Null_Address,
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204 Raise_Hook => null);
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205
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206 pragma Export (C, Constraint_Error_Def, "constraint_error");
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207 pragma Export (C, Numeric_Error_Def, "numeric_error");
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208 pragma Export (C, Program_Error_Def, "program_error");
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209 pragma Export (C, Storage_Error_Def, "storage_error");
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210 pragma Export (C, Tasking_Error_Def, "tasking_error");
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211 pragma Export (C, Abort_Signal_Def, "_abort_signal");
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212
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213 Local_Partition_ID : Natural := 0;
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214 -- This variable contains the local Partition_ID that will be used when
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215 -- building exception occurrences. In distributed mode, it will be
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216 -- set by each partition to the correct value during the elaboration.
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217
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218 type Exception_Trace_Kind is
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219 (RM_Convention,
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220 -- No particular trace is requested, only unhandled exceptions
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221 -- in the environment task (following the RM) will be printed.
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222 -- This is the default behavior.
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223
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224 Every_Raise,
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225 -- Denotes the initial raise event for any exception occurrence, either
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226 -- explicit or due to a specific language rule, within the context of a
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227 -- task or not.
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228
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229 Unhandled_Raise,
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230 -- Denotes the raise events corresponding to exceptions for which there
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231 -- is no user defined handler. This includes unhandled exceptions in
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232 -- task bodies.
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233
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234 Unhandled_Raise_In_Main
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235 -- Same as Unhandled_Raise, except exceptions in task bodies are not
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236 -- included. Same as RM_Convention, except (1) the message is printed as
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237 -- soon as the environment task completes due to an unhandled exception
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238 -- (before awaiting the termination of dependent tasks, and before
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239 -- library-level finalization), and (2) a symbolic traceback is given
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240 -- if possible. This is the default behavior if the binder switch -E is
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241 -- used.
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242 );
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243 -- Provide a way to denote different kinds of automatic traces related
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244 -- to exceptions that can be requested.
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245
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246 Exception_Trace : Exception_Trace_Kind := RM_Convention;
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247 pragma Atomic (Exception_Trace);
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248 -- By default, follow the RM convention
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249
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250 -----------------
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251 -- Subprograms --
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252 -----------------
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253
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254 procedure Abort_Undefer_Direct;
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255 pragma Inline (Abort_Undefer_Direct);
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256 -- A little procedure that just calls Abort_Undefer.all, for use in
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257 -- clean up procedures, which only permit a simple subprogram name.
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258
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259 procedure Adafinal;
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260 -- Performs the Ada Runtime finalization the first time it is invoked.
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261 -- All subsequent calls are ignored.
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262
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263 end System.Standard_Library;
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