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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- E X P A N D E R --
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6 -- --
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7 -- B o d y --
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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 with Atree; use Atree;
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27 with Debug; use Debug;
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28 with Debug_A; use Debug_A;
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29 with Exp_Aggr; use Exp_Aggr;
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30 with Exp_SPARK; use Exp_SPARK;
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31 with Exp_Attr; use Exp_Attr;
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32 with Exp_Ch2; use Exp_Ch2;
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33 with Exp_Ch3; use Exp_Ch3;
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34 with Exp_Ch4; use Exp_Ch4;
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35 with Exp_Ch5; use Exp_Ch5;
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36 with Exp_Ch6; use Exp_Ch6;
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37 with Exp_Ch7; use Exp_Ch7;
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38 with Exp_Ch8; use Exp_Ch8;
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39 with Exp_Ch9; use Exp_Ch9;
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40 with Exp_Ch11; use Exp_Ch11;
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41 with Exp_Ch12; use Exp_Ch12;
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42 with Exp_Ch13; use Exp_Ch13;
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43 with Exp_Prag; use Exp_Prag;
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44 with Ghost; use Ghost;
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45 with Opt; use Opt;
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46 with Rtsfind; use Rtsfind;
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47 with Sem; use Sem;
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48 with Sem_Ch8; use Sem_Ch8;
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49 with Sem_Util; use Sem_Util;
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50 with Sinfo; use Sinfo;
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51 with Table;
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52
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53 package body Expander is
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54
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55 ----------------
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56 -- Local Data --
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57 ----------------
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58
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59 -- The following table is used to save values of the Expander_Active flag
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60 -- when they are saved by Expander_Mode_Save_And_Set. We use an extendible
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61 -- table (which is a bit of overkill) because it is easier than figuring
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62 -- out a maximum value or bothering with range checks.
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63
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64 package Expander_Flags is new Table.Table (
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65 Table_Component_Type => Boolean,
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66 Table_Index_Type => Int,
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67 Table_Low_Bound => 0,
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68 Table_Initial => 32,
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69 Table_Increment => 200,
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70 Table_Name => "Expander_Flags");
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71
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72 Abort_Bug_Box_Error : exception;
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73 -- Arbitrary exception to raise for implementation of -gnatd.B. See "when
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74 -- N_Abort_Statement" below. See also debug.adb.
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75
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76 ------------
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77 -- Expand --
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78 ------------
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79
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80 -- WARNING: This routine manages Ghost regions. Return statements must be
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81 -- replaced by gotos which jump to the end of the routine and restore the
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82 -- Ghost mode.
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83
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84 procedure Expand (N : Node_Id) is
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131
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85 Saved_GM : constant Ghost_Mode_Type := Ghost_Mode;
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86 Saved_IGR : constant Node_Id := Ignored_Ghost_Region;
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87 -- Save the Ghost-related attributes to restore on exit
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111
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88
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89 begin
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90 -- If we were analyzing a default expression (or other spec expression)
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91 -- the Full_Analysis flag must be off. If we are in expansion mode then
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92 -- we must be performing a full analysis. If we are analyzing a generic
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93 -- then Expansion must be off.
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94
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95 pragma Assert
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96 (not (Full_Analysis and then In_Spec_Expression)
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97 and then (Full_Analysis or else not Expander_Active)
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98 and then not (Inside_A_Generic and then Expander_Active));
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99
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100 -- Establish the Ghost mode of the context to ensure that any generated
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101 -- nodes during expansion are marked as Ghost.
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102
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103 Set_Ghost_Mode (N);
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104
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105 -- The GNATprove_Mode flag indicates that a light expansion for formal
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106 -- verification should be used. This expansion is never done inside
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107 -- generics, because otherwise, this breaks the name resolution
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108 -- mechanism for generic instances.
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109
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110 if GNATprove_Mode then
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111 if not Inside_A_Generic then
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112 Expand_SPARK (N);
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113 end if;
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114
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115 Set_Analyzed (N, Full_Analysis);
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116
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117 -- Regular expansion is normally followed by special handling for
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118 -- transient scopes for unconstrained results, etc. but this is not
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119 -- needed, and in general cannot be done correctly, in this mode, so
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120 -- we are all done.
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121
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122 goto Leave;
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123
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124 -- There are three reasons for the Expander_Active flag to be false
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125
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126 -- The first is when are not generating code. In this mode the
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127 -- Full_Analysis flag indicates whether we are performing a complete
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131
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128 -- analysis, in which case Full_Analysis = True or a preanalysis in
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111
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129 -- which case Full_Analysis = False. See the spec of Sem for more info
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130 -- on this.
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131
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132 -- The second reason for the Expander_Active flag to be False is that
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131
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133 -- we are performing a preanalysis. During preanalysis all expansion
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111
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134 -- activity is turned off to make sure nodes are semantically decorated
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135 -- but no extra nodes are generated. This is for instance needed for
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136 -- the first pass of aggregate semantic processing. Note that in this
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137 -- case the Full_Analysis flag is set to False because the node will
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138 -- subsequently be re-analyzed with expansion on (see the spec of sem).
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139
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140 -- Finally, expansion is turned off in a regular compilation if there
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141 -- are serious errors. In that case there will be no further expansion,
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142 -- but one cleanup action may be required: if a transient scope was
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143 -- created (e.g. for a function that returns an unconstrained type) the
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144 -- scope may still be on the stack, and must be removed explicitly,
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145 -- given that the expansion actions that would normally process it will
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146 -- not take place. This prevents cascaded errors due to stack mismatch.
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147
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148 elsif not Expander_Active then
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149 Set_Analyzed (N, Full_Analysis);
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150
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151 if Serious_Errors_Detected > 0 and then Scope_Is_Transient then
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152 Scope_Stack.Table
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153 (Scope_Stack.Last).Actions_To_Be_Wrapped := (others => No_List);
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154 Pop_Scope;
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155 end if;
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156
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157 goto Leave;
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158
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159 else
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160 begin
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161 Debug_A_Entry ("expanding ", N);
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162
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163 -- Processing depends on node kind. For full details on the
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164 -- expansion activity required in each case, see bodies of
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165 -- corresponding expand routines.
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166
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167 case Nkind (N) is
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168 when N_Abort_Statement =>
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169 Expand_N_Abort_Statement (N);
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170
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171 -- If -gnatd.B switch was given, crash the compiler. See
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172 -- debug.adb for explanation.
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173
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174 if Debug_Flag_Dot_BB then
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175 raise Abort_Bug_Box_Error;
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176 end if;
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177
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178 when N_Accept_Statement =>
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179 Expand_N_Accept_Statement (N);
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180
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181 when N_Aggregate =>
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182 Expand_N_Aggregate (N);
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183
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184 when N_Allocator =>
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185 Expand_N_Allocator (N);
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186
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187 when N_And_Then =>
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188 Expand_N_And_Then (N);
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189
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190 when N_Assignment_Statement =>
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191 Expand_N_Assignment_Statement (N);
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192
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193 when N_Asynchronous_Select =>
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194 Expand_N_Asynchronous_Select (N);
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195
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196 when N_Attribute_Definition_Clause =>
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197 Expand_N_Attribute_Definition_Clause (N);
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198
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199 when N_Attribute_Reference =>
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200 Expand_N_Attribute_Reference (N);
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201
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202 when N_Block_Statement =>
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203 Expand_N_Block_Statement (N);
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204
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205 when N_Case_Expression =>
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206 Expand_N_Case_Expression (N);
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207
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208 when N_Case_Statement =>
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209 Expand_N_Case_Statement (N);
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210
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211 when N_Conditional_Entry_Call =>
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212 Expand_N_Conditional_Entry_Call (N);
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213
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214 when N_Delay_Relative_Statement =>
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215 Expand_N_Delay_Relative_Statement (N);
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216
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217 when N_Delay_Until_Statement =>
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218 Expand_N_Delay_Until_Statement (N);
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219
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220 when N_Delta_Aggregate =>
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221 Expand_N_Delta_Aggregate (N);
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222
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223 when N_Entry_Body =>
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224 Expand_N_Entry_Body (N);
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225
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226 when N_Entry_Call_Statement =>
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227 Expand_N_Entry_Call_Statement (N);
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228
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229 when N_Entry_Declaration =>
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230 Expand_N_Entry_Declaration (N);
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231
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232 when N_Exception_Declaration =>
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233 Expand_N_Exception_Declaration (N);
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234
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235 when N_Exception_Renaming_Declaration =>
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236 Expand_N_Exception_Renaming_Declaration (N);
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237
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238 when N_Exit_Statement =>
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239 Expand_N_Exit_Statement (N);
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240
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241 when N_Expanded_Name =>
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242 Expand_N_Expanded_Name (N);
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243
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244 when N_Explicit_Dereference =>
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245 Expand_N_Explicit_Dereference (N);
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246
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247 when N_Expression_With_Actions =>
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248 Expand_N_Expression_With_Actions (N);
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249
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250 when N_Extended_Return_Statement =>
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251 Expand_N_Extended_Return_Statement (N);
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252
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253 when N_Extension_Aggregate =>
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254 Expand_N_Extension_Aggregate (N);
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255
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256 when N_Free_Statement =>
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257 Expand_N_Free_Statement (N);
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258
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259 when N_Freeze_Entity =>
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260 Expand_N_Freeze_Entity (N);
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261
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262 when N_Full_Type_Declaration =>
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263 Expand_N_Full_Type_Declaration (N);
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264
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265 when N_Function_Call =>
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266 Expand_N_Function_Call (N);
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267
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268 when N_Generic_Instantiation =>
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269 Expand_N_Generic_Instantiation (N);
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270
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271 when N_Goto_Statement =>
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272 Expand_N_Goto_Statement (N);
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273
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274 when N_Handled_Sequence_Of_Statements =>
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275 Expand_N_Handled_Sequence_Of_Statements (N);
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276
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277 when N_Identifier =>
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278 Expand_N_Identifier (N);
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279
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280 when N_If_Expression =>
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281 Expand_N_If_Expression (N);
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282
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283 when N_Indexed_Component =>
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284 Expand_N_Indexed_Component (N);
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285
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286 when N_If_Statement =>
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287 Expand_N_If_Statement (N);
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288
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289 when N_In =>
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290 Expand_N_In (N);
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291
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292 when N_Loop_Statement =>
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293 Expand_N_Loop_Statement (N);
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294
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295 when N_Not_In =>
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296 Expand_N_Not_In (N);
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297
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298 when N_Null =>
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299 Expand_N_Null (N);
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300
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301 when N_Object_Declaration =>
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302 Expand_N_Object_Declaration (N);
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303
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304 when N_Object_Renaming_Declaration =>
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305 Expand_N_Object_Renaming_Declaration (N);
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306
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307 when N_Op_Add =>
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308 Expand_N_Op_Add (N);
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309
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310 when N_Op_Abs =>
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311 Expand_N_Op_Abs (N);
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312
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313 when N_Op_And =>
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314 Expand_N_Op_And (N);
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315
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316 when N_Op_Concat =>
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317 Expand_N_Op_Concat (N);
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318
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319 when N_Op_Divide =>
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320 Expand_N_Op_Divide (N);
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321
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322 when N_Op_Eq =>
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323 Expand_N_Op_Eq (N);
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324
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325 when N_Op_Expon =>
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326 Expand_N_Op_Expon (N);
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327
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328 when N_Op_Ge =>
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329 Expand_N_Op_Ge (N);
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330
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331 when N_Op_Gt =>
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332 Expand_N_Op_Gt (N);
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333
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334 when N_Op_Le =>
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335 Expand_N_Op_Le (N);
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336
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337 when N_Op_Lt =>
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338 Expand_N_Op_Lt (N);
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339
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340 when N_Op_Minus =>
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341 Expand_N_Op_Minus (N);
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342
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343 when N_Op_Mod =>
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344 Expand_N_Op_Mod (N);
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345
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346 when N_Op_Multiply =>
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347 Expand_N_Op_Multiply (N);
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348
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349 when N_Op_Ne =>
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350 Expand_N_Op_Ne (N);
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351
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352 when N_Op_Not =>
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353 Expand_N_Op_Not (N);
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354
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355 when N_Op_Or =>
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356 Expand_N_Op_Or (N);
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357
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358 when N_Op_Plus =>
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359 Expand_N_Op_Plus (N);
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360
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361 when N_Op_Rem =>
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362 Expand_N_Op_Rem (N);
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363
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364 when N_Op_Rotate_Left =>
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365 Expand_N_Op_Rotate_Left (N);
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366
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367 when N_Op_Rotate_Right =>
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368 Expand_N_Op_Rotate_Right (N);
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369
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370 when N_Op_Shift_Left =>
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371 Expand_N_Op_Shift_Left (N);
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372
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373 when N_Op_Shift_Right =>
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374 Expand_N_Op_Shift_Right (N);
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375
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376 when N_Op_Shift_Right_Arithmetic =>
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377 Expand_N_Op_Shift_Right_Arithmetic (N);
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378
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379 when N_Op_Subtract =>
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380 Expand_N_Op_Subtract (N);
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381
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382 when N_Op_Xor =>
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383 Expand_N_Op_Xor (N);
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384
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385 when N_Or_Else =>
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386 Expand_N_Or_Else (N);
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387
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388 when N_Package_Body =>
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389 Expand_N_Package_Body (N);
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390
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391 when N_Package_Declaration =>
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392 Expand_N_Package_Declaration (N);
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393
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394 when N_Package_Renaming_Declaration =>
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395 Expand_N_Package_Renaming_Declaration (N);
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396
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397 when N_Subprogram_Renaming_Declaration =>
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398 Expand_N_Subprogram_Renaming_Declaration (N);
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399
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400 when N_Pragma =>
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401 Expand_N_Pragma (N);
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402
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403 when N_Procedure_Call_Statement =>
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404 Expand_N_Procedure_Call_Statement (N);
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405
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406 when N_Protected_Type_Declaration =>
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407 Expand_N_Protected_Type_Declaration (N);
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408
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409 when N_Protected_Body =>
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410 Expand_N_Protected_Body (N);
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411
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412 when N_Qualified_Expression =>
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413 Expand_N_Qualified_Expression (N);
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414
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415 when N_Quantified_Expression =>
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416 Expand_N_Quantified_Expression (N);
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417
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418 when N_Raise_Statement =>
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419 Expand_N_Raise_Statement (N);
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420
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421 when N_Raise_Constraint_Error =>
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422 Expand_N_Raise_Constraint_Error (N);
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423
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424 when N_Raise_Expression =>
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425 Expand_N_Raise_Expression (N);
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426
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427 when N_Raise_Program_Error =>
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428 Expand_N_Raise_Program_Error (N);
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429
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430 when N_Raise_Storage_Error =>
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431 Expand_N_Raise_Storage_Error (N);
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432
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433 when N_Real_Literal =>
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434 Expand_N_Real_Literal (N);
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435
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436 when N_Record_Representation_Clause =>
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437 Expand_N_Record_Representation_Clause (N);
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438
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439 when N_Requeue_Statement =>
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440 Expand_N_Requeue_Statement (N);
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441
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442 when N_Simple_Return_Statement =>
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443 Expand_N_Simple_Return_Statement (N);
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444
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445 when N_Selected_Component =>
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446 Expand_N_Selected_Component (N);
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447
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448 when N_Selective_Accept =>
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449 Expand_N_Selective_Accept (N);
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450
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451 when N_Single_Protected_Declaration =>
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452 Expand_N_Single_Protected_Declaration (N);
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453
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454 when N_Single_Task_Declaration =>
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455 Expand_N_Single_Task_Declaration (N);
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456
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457 when N_Slice =>
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458 Expand_N_Slice (N);
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459
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460 when N_Subtype_Indication =>
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461 Expand_N_Subtype_Indication (N);
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462
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463 when N_Subprogram_Body =>
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464 Expand_N_Subprogram_Body (N);
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465
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466 when N_Subprogram_Body_Stub =>
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467 Expand_N_Subprogram_Body_Stub (N);
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468
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469 when N_Subprogram_Declaration =>
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470 Expand_N_Subprogram_Declaration (N);
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471
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472 when N_Task_Body =>
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473 Expand_N_Task_Body (N);
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474
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475 when N_Task_Type_Declaration =>
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476 Expand_N_Task_Type_Declaration (N);
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477
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478 when N_Timed_Entry_Call =>
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479 Expand_N_Timed_Entry_Call (N);
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480
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481 when N_Type_Conversion =>
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482 Expand_N_Type_Conversion (N);
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483
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484 when N_Unchecked_Expression =>
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485 Expand_N_Unchecked_Expression (N);
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486
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487 when N_Unchecked_Type_Conversion =>
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488 Expand_N_Unchecked_Type_Conversion (N);
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489
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490 when N_Variant_Part =>
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491 Expand_N_Variant_Part (N);
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492
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|
493 -- For all other node kinds, no expansion activity required
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494
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495 when others =>
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496 null;
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|
497 end case;
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|
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498
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|
|
499 exception
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|
500 when RE_Not_Available =>
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|
|
501 goto Leave;
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502 end;
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503
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|
|
504 -- Set result as analyzed and then do a possible transient wrap. The
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|
|
505 -- transient wrap must be done after the Analyzed flag is set on, so
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506 -- that we do not get a recursive attempt to expand the node N.
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|
|
507
|
|
|
508 Set_Analyzed (N);
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|
|
509
|
|
|
510 -- Deal with transient scopes
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|
|
511
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|
|
512 if Scope_Is_Transient and then N = Node_To_Be_Wrapped then
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|
|
513 case Nkind (N) is
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|
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514 when N_Procedure_Call_Statement
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|
|
515 | N_Statement_Other_Than_Procedure_Call
|
|
|
516 =>
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|
|
517 Wrap_Transient_Statement (N);
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|
|
518
|
|
|
519 when N_Object_Declaration
|
|
|
520 | N_Object_Renaming_Declaration
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|
|
521 | N_Subtype_Declaration
|
|
|
522 =>
|
|
|
523 Wrap_Transient_Declaration (N);
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|
|
524
|
|
|
525 when others =>
|
|
|
526 Wrap_Transient_Expression (N);
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|
|
527 end case;
|
|
|
528 end if;
|
|
|
529
|
|
|
530 Debug_A_Exit ("expanding ", N, " (done)");
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|
|
531 end if;
|
|
|
532
|
|
|
533 <<Leave>>
|
|
131
|
534 Restore_Ghost_Region (Saved_GM, Saved_IGR);
|
|
111
|
535 end Expand;
|
|
|
536
|
|
|
537 ---------------------------
|
|
|
538 -- Expander_Mode_Restore --
|
|
|
539 ---------------------------
|
|
|
540
|
|
|
541 procedure Expander_Mode_Restore is
|
|
|
542 begin
|
|
|
543 -- Not active (has no effect) in ASIS and GNATprove modes (see comments
|
|
|
544 -- in spec of Expander_Mode_Save_And_Set).
|
|
|
545
|
|
|
546 if ASIS_Mode or GNATprove_Mode then
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|
|
547 return;
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|
|
548 end if;
|
|
|
549
|
|
|
550 -- Otherwise restore the flag
|
|
|
551
|
|
|
552 Expander_Active := Expander_Flags.Table (Expander_Flags.Last);
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|
|
553 Expander_Flags.Decrement_Last;
|
|
|
554
|
|
|
555 -- Keep expander off if serious errors detected. In this case we do not
|
|
|
556 -- need expansion, and continued expansion may cause cascaded errors or
|
|
|
557 -- compiler bombs.
|
|
|
558
|
|
|
559 if Serious_Errors_Detected /= 0 then
|
|
|
560 Expander_Active := False;
|
|
|
561 end if;
|
|
|
562 end Expander_Mode_Restore;
|
|
|
563
|
|
|
564 --------------------------------
|
|
|
565 -- Expander_Mode_Save_And_Set --
|
|
|
566 --------------------------------
|
|
|
567
|
|
|
568 procedure Expander_Mode_Save_And_Set (Status : Boolean) is
|
|
|
569 begin
|
|
|
570 -- Not active (has no effect) in ASIS and GNATprove modes (see comments
|
|
|
571 -- in spec of Expander_Mode_Save_And_Set).
|
|
|
572
|
|
|
573 if ASIS_Mode or GNATprove_Mode then
|
|
|
574 return;
|
|
|
575 end if;
|
|
|
576
|
|
|
577 -- Otherwise save and set the flag
|
|
|
578
|
|
|
579 Expander_Flags.Increment_Last;
|
|
|
580 Expander_Flags.Table (Expander_Flags.Last) := Expander_Active;
|
|
|
581 Expander_Active := Status;
|
|
|
582 end Expander_Mode_Save_And_Set;
|
|
|
583
|
|
|
584 end Expander;
|
