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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 -- A D A B K E N D --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 2001-2019, AdaCore --
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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 ------------------------------------------------------------------------------
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22
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23 -- This is the version of the Back_End package for back ends written in Ada
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24
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25 with Atree; use Atree;
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26 with Debug;
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27 with Lib;
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28 with Opt; use Opt;
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29 with Output; use Output;
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30 with Osint; use Osint;
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31 with Osint.C; use Osint.C;
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32 with Switch.C; use Switch.C;
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33 with Types; use Types;
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34
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35 with System.OS_Lib; use System.OS_Lib;
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36
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37 package body Adabkend is
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38
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39 use Switch;
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40
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41 -------------------
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42 -- Call_Back_End --
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43 -------------------
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44
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45 procedure Call_Back_End is
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46 begin
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47 if (Opt.Verbose_Mode or Opt.Full_List)
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48 and then not Debug.Debug_Flag_7
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49 then
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50 Write_Eol;
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51 Write_Str (Product_Name);
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52 Write_Str (", Copyright ");
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53 Write_Str (Copyright_Years);
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54 Write_Str (" Ada Core Technologies, Inc.");
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55 Write_Str (" (http://www.adacore.com)");
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56 Write_Eol;
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57 Write_Eol;
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58 end if;
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59
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60 -- The front end leaves the Current_Error_Node at a location that is
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61 -- meaningless and confusing when emitting bug boxes from the back end.
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62 -- Reset the global variable in order to emit "No source file position
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63 -- information available" messages on back end crashes.
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64
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65 Current_Error_Node := Empty;
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66
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67 Driver (Lib.Cunit (Types.Main_Unit));
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68 end Call_Back_End;
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69
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131
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70 -----------------------------
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71 -- Scan_Compiler_Arguments --
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72 -----------------------------
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111
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73
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74 procedure Scan_Compiler_Arguments is
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75 Output_File_Name_Seen : Boolean := False;
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76 -- Set to True after having scanned the file_name for switch
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77 -- "-gnatO file_name"
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78
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79 Argument_Count : constant Integer := Arg_Count - 1;
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80 -- Number of arguments (excluding program name)
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81
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82 Args : Argument_List (1 .. Argument_Count);
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83 Next_Arg : Positive := 1;
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84
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85 procedure Scan_Back_End_Switches (Switch_Chars : String);
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86 -- Procedure to scan out switches stored in Switch_Chars. The first
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87 -- character is known to be a valid switch character, and there are no
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88 -- blanks or other switch terminator characters in the string, so the
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89 -- entire string should consist of valid switch characters, except that
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90 -- an optional terminating NUL character is allowed.
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91 --
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92 -- If the switch is not valid, control will not return. The switches
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93 -- must still be scanned to skip the "-o" arguments, or internal GCC
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94 -- switches, which may be safely ignored by other back ends.
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95
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96 ----------------------------
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97 -- Scan_Back_End_Switches --
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98 ----------------------------
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99
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100 procedure Scan_Back_End_Switches (Switch_Chars : String) is
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101 First : constant Positive := Switch_Chars'First + 1;
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102 Last : constant Natural := Switch_Last (Switch_Chars);
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103
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104 begin
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105 -- Process any back end switches, returning if the switch does not
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106 -- affect code generation or falling through if it does, so the
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107 -- switch will get stored.
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108
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109 -- Skip -o, -G or internal GCC switches together with their argument.
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110
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111 if Switch_Chars (First .. Last) = "o"
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112 or else Switch_Chars (First .. Last) = "G"
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113 or else Is_Internal_GCC_Switch (Switch_Chars)
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114 then
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115 Next_Arg := Next_Arg + 1;
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116 return; -- ignore this switch
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117
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118 -- Set optimization indicators appropriately. In gcc-based GNAT this
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119 -- is picked up from imported variables set by the gcc driver, but
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120 -- for compilers with non-gcc back ends we do it here to allow use of
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121 -- these switches by the front end. Allowed optimization switches are
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122 -- -Os (optimize for size), -O[0123], -O (same as -O1), -Ofast
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123 -- (disregard strict standards compliance), and -Og (optimize
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124 -- debugging experience).
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125
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126 elsif Switch_Chars (First) = 'O' then
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127 if First = Last then
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128 Optimization_Level := 1;
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129
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130 elsif Last - First = 1 then
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131 if Switch_Chars (Last) = 's' then
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132 Optimize_Size := 1;
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133 Optimization_Level := 2; -- Consistent with gcc setting
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134
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135 elsif Switch_Chars (Last) in '0' .. '3' then
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136 Optimization_Level :=
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137 Character'Pos (Switch_Chars (Last)) - Character'Pos ('0');
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138
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139 -- Switch -Og is between -O0 and -O1 in GCC. Consider it like
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140 -- -O0 for other back ends.
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141
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142 elsif Switch_Chars (Last) = 'g' then
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143 Optimization_Level := 0;
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144
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145 else
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146 Fail ("invalid switch: " & Switch_Chars);
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147 end if;
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148
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145
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149 -- Switch -Ofast enables -O3
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150
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151 elsif Switch_Chars (First + 1 .. Last) = "fast" then
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152 Optimization_Level := 3;
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153
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154 else
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155 Fail ("invalid switch: " & Switch_Chars);
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156 end if;
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157
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158 elsif Switch_Chars (First .. Last) = "quiet" then
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159 return; -- ignore this switch
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160
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161 elsif Switch_Chars (First .. Last) = "c" then
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162 return; -- ignore this switch
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163
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164 -- The -x switch and its language name argument will generally be
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165 -- ignored by non-gcc back ends. In any case, we save the switch and
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166 -- argument in the compilation switches.
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167
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168 elsif Switch_Chars (First .. Last) = "x" then
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169 Lib.Store_Compilation_Switch (Switch_Chars);
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170 Next_Arg := Next_Arg + 1;
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171
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172 declare
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173 Argv : constant String := Args (Next_Arg).all;
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174
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175 begin
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176 if Is_Switch (Argv) then
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177 Fail ("language name missing after -x");
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178 else
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179 Lib.Store_Compilation_Switch (Argv);
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180 end if;
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181 end;
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182
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183 return;
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184
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185 -- Special check, the back-end switch -fno-inline also sets the
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186 -- front end flags to entirely inhibit all inlining. So we store it
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187 -- and set the appropriate flags.
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188
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189 elsif Switch_Chars (First .. Last) = "fno-inline" then
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190 Lib.Store_Compilation_Switch (Switch_Chars);
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191 Opt.Disable_FE_Inline := True;
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192 Opt.Disable_FE_Inline_Always := True;
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193 return;
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194
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195 -- Similar processing for -fpreserve-control-flow
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196
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197 elsif Switch_Chars (First .. Last) = "fpreserve-control-flow" then
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198 Lib.Store_Compilation_Switch (Switch_Chars);
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199 Opt.Suppress_Control_Flow_Optimizations := True;
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200 return;
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201
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202 -- Recognize -gxxx switches
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203
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204 elsif Switch_Chars (First) = 'g' then
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205 Debugger_Level := 2;
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206
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207 if First < Last then
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208 case Switch_Chars (First + 1) is
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209 when '0' =>
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210 Debugger_Level := 0;
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211 when '1' =>
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212 Debugger_Level := 1;
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213 when '2' =>
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214 Debugger_Level := 2;
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215 when '3' =>
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216 Debugger_Level := 3;
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217 when others =>
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218 null;
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219 end case;
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220 end if;
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221
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222 -- Ignore all other back-end switches
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111
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223
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224 elsif Is_Back_End_Switch (Switch_Chars) then
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225 null;
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226
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227 -- Give error for junk switch
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228
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229 else
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230 Fail ("invalid switch: " & Switch_Chars);
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231 end if;
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232
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233 -- Store any other GCC switches
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234
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235 Lib.Store_Compilation_Switch (Switch_Chars);
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236 end Scan_Back_End_Switches;
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237
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238 -- Start of processing for Scan_Compiler_Args
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239
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240 begin
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241 -- Put all the arguments in argument list Args
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242
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243 for Arg in 1 .. Argument_Count loop
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244 declare
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245 Argv : String (1 .. Len_Arg (Arg));
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246 begin
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247 Fill_Arg (Argv'Address, Arg);
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248 Args (Arg) := new String'(Argv);
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249 end;
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250 end loop;
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251
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252 -- Loop through command line arguments, storing them for later access
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253
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254 while Next_Arg <= Argument_Count loop
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255 Look_At_Arg : declare
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256 Argv : constant String := Args (Next_Arg).all;
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257
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258 begin
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259 if Argv'Length = 0 then
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260 Fail ("Empty argument");
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261 end if;
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262
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263 -- If the previous switch has set the Output_File_Name_Present
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264 -- flag (that is we have seen a -gnatO), then the next argument
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265 -- is the name of the output object file.
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266
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267 if Opt.Output_File_Name_Present
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268 and then not Output_File_Name_Seen
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269 then
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270 if Is_Switch (Argv) then
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271 Fail ("Object file name missing after -gnatO");
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272 else
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273 Set_Output_Object_File_Name (Argv);
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274 Output_File_Name_Seen := True;
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275 end if;
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276
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277 -- If the previous switch has set the Search_Directory_Present
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278 -- flag (that is if we have just seen -I), then the next
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279 -- argument is a search directory path.
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280
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281 elsif Search_Directory_Present then
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282 if Is_Switch (Argv) then
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283 Fail ("search directory missing after -I");
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284 else
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285 Add_Src_Search_Dir (Argv);
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286
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287 -- Add directory to lib search so that back end can take as
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288 -- input ALI files if needed. Otherwise this won't have any
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289 -- impact on the compiler.
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290
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291 Add_Lib_Search_Dir (Argv);
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292
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293 Search_Directory_Present := False;
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294 end if;
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295
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296 -- If not a switch, must be a file name
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297
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298 elsif not Is_Switch (Argv) then
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299 Add_File (Argv);
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300
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301 -- We must recognize -nostdinc to suppress visibility on the
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302 -- standard GNAT RTL sources.
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303
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304 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
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305 Opt.No_Stdinc := True;
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306
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307 -- Front end switch
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308
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309 elsif Is_Front_End_Switch (Argv) then
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310 Scan_Front_End_Switches (Argv, Args, Next_Arg);
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311
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312 -- All non-front-end switches are back-end switches
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313
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314 else
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315 Scan_Back_End_Switches (Argv);
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316 end if;
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317 end Look_At_Arg;
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318
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319 Next_Arg := Next_Arg + 1;
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320 end loop;
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321 end Scan_Compiler_Arguments;
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322
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323 end Adabkend;
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