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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 _ C O D E --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1996-2019, 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. 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 -- Processing for handling code statements
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27
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28 with Types; use Types;
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29
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30 with System; use System;
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31 package Exp_Code is
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32
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33 procedure Expand_Asm_Call (N : Node_Id);
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34 -- Expands a call to Asm into an equivalent N_Code_Statement node
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35
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36 -- The following routines provide an abstract interface to analyze
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37 -- code statements, for use by Gigi processing for code statements.
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38 -- Note that the implementations of these routines must not attempt
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39 -- to expand tables that are frozen on entry to Gigi.
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40
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41 -- WARNING: There is a matching C declaration of these subprograms in fe.h
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42
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43 function Is_Asm_Volatile (N : Node_Id) return Boolean;
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44 -- Given an N_Code_Statement node N, return True if Volatile=True is
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45 -- specified, and False if Volatile=False is specified (or set by default).
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46
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47 function Asm_Template (N : Node_Id) return Node_Id;
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48 -- Given an N_Code_Statement node N, returns string literal node for
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49 -- template in call
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50
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51 procedure Clobber_Setup (N : Node_Id);
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52 -- Given an N_Code_Statement node N, setup to process the clobber list
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53 -- with subsequent calls to Clobber_Get_Next.
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54
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55 function Clobber_Get_Next return System.Address;
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56 -- Can only be called after a previous call to Clobber_Setup. The
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57 -- returned value is a pointer to a null terminated (C format) string
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58 -- for the next register argument. Null_Address is returned when there
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59 -- are no more arguments.
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60
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61 procedure Setup_Asm_Inputs (N : Node_Id);
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62 -- Given an N_Code_Statement node N, setup to read list of Asm_Input
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63 -- arguments. The protocol is to construct a loop as follows:
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64 --
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65 -- Setup_Asm_Inputs (N);
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66 -- while Present (Asm_Input_Value)
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67 -- body
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68 -- Next_Asm_Input;
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69 -- end loop;
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70 --
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71 -- where the loop body calls Asm_Input_Constraint or Asm_Input_Value to
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72 -- obtain the constraint string or input value expression from the current
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73 -- Asm_Input argument.
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74
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75 function Asm_Input_Constraint return Node_Id;
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76 -- Called within a loop initialized by Setup_Asm_Inputs and controlled
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77 -- by Next_Asm_Input as described above. Returns a string literal node
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78 -- for the constraint component of the current Asm_Input_Parameter, or
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79 -- Empty if there are no more Asm_Input parameters.
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80
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81 function Asm_Input_Value return Node_Id;
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82 -- Called within a loop initialized by Setup_Asm_Inputs and controlled
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83 -- by Next_Asm_Input as described above. Returns the expression node for
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84 -- the value component of the current Asm_Input parameter, or Empty if
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85 -- there are no more Asm_Input parameters, or Error if an error was
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86 -- previously detected in the input parameters (note that the backend
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87 -- need not worry about this case, since it won't be called if there
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88 -- were any such serious errors detected).
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89
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90 procedure Next_Asm_Input;
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91 -- Step to next Asm_Input parameter. It is an error to call this procedure
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92 -- if there are no more available parameters (which is impossible if the
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93 -- call appears in a loop as in the above example).
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94
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95 procedure Setup_Asm_Outputs (N : Node_Id);
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96 -- Given an N_Code_Statement node N, setup to read list of Asm_Output
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97 -- arguments. The protocol is to construct a loop as follows:
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98 --
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99 -- Setup_Asm_Outputs (N);
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100 -- while Present (Asm_Output_Variable)
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101 -- body
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102 -- Next_Asm_Output;
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103 -- end loop;
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104 --
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105 -- where the loop body calls Asm_Output_Constraint or Asm_Output_Variable
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106 -- to obtain the constraint string or output variable name from the current
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107 -- Asm_Output argument.
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108
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109 function Asm_Output_Constraint return Node_Id;
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110 -- Called within a loop initialized by Setup_Asm_Outputs and controlled
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111 -- by Next_Asm_Output as described above. Returns a string literal node
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112 -- for the constraint component of the current Asm_Output_Parameter, or
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113 -- Empty if there are no more Asm_Output parameters.
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114
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115 function Asm_Output_Variable return Node_Id;
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116 -- Called within a loop initialized by Setup_Asm_Outputs and controlled by
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117 -- Next_Asm_Output as described above. Returns the expression node for the
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118 -- output variable component of the current Asm_Output parameter, or Empty
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119 -- if there are no more Asm_Output parameters, or Error if an error was
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120 -- previously detected in the input parameters (note that the backend need
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121 -- not worry about this case, since it won't be called if there were any
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122 -- such serious errors detected).
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123
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124 procedure Next_Asm_Output;
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125 -- Step to next Asm_Output parameter. It is an error to call this procedure
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126 -- if there are no more available parameters (which is impossible if the
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127 -- call appears in a loop as in the above example).
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128
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129 end Exp_Code;
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