1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 -- This package contains various utility procedures to assist in
28 -- building specific types of tree nodes.
30 with Types; use Types;
34 function Checks_Off (N : Node_Id) return Node_Id;
35 pragma Inline (Checks_Off);
36 -- Returns an N_Unchecked_Expression node whose expression is the given
37 -- argument. The results is a subexpression identical to the argument,
38 -- except that it will be analyzed and resolved with checks off.
40 function Convert_To (Typ : Entity_Id; Expr : Node_Id) return Node_Id;
41 -- Returns an expression that represents the result of a checked convert
42 -- of expression Exp to type T. If the base type of Exp is T, then no
43 -- conversion is required, and Exp is returned unchanged. Otherwise an
44 -- N_Type_Conversion node is constructed to convert the expression.
45 -- If an N_Type_Conversion node is required, Relocate_Node is used on
46 -- Exp. This means that it is safe to replace a node by a Convert_To
47 -- of itself to some other type.
49 procedure Discard_Node (N : Node_Or_Entity_Id);
50 pragma Inline (Discard_Node);
51 -- This is a dummy procedure that simply returns and does nothing.
52 -- It is used when a function returning a Node_Id value is called
53 -- for its side effect (e.g. a call to Make to construct a node)
54 -- but the Node_Id value is not required.
56 procedure Discard_List (L : List_Id);
57 pragma Inline (Discard_List);
58 -- This is a dummy procedure that simply returns and does nothing.
59 -- It is used when a function returning a Node_Id value is called
60 -- for its side effect (e.g. a call to the pareser to parse a list
61 -- of compilation units), but the List_Id value is not required.
63 function Make_Byte_Aligned_Attribute_Reference
66 Attribute_Name : Name_Id) return Node_Id;
67 pragma Inline (Make_Byte_Aligned_Attribute_Reference);
68 -- Like the standard Make_Attribute_Reference but the special flag
69 -- Must_Be_Byte_Aligned is set in the attribute reference node. The
70 -- Attribute_Name must be Name_Address or Name_Unrestricted_Access.
72 function Make_DT_Component
75 I : Positive) return Node_Id;
76 -- Gives a reference to the Ith component of the Dispatch Table of
77 -- a given Tagged Type.
79 -- I = 1 --> Inheritance_Depth
80 -- I = 2 --> Tags (array of ancestors)
81 -- I = 3, 4 --> predefined primitive
82 -- function _Size (X : Typ) return Long_Long_Integer;
83 -- function _Equality (X : Typ; Y : Typ'Class) return Boolean;
84 -- I >= 5 --> User-Defined Primitive Operations
86 function Make_DT_Access
87 (Loc : Source_Ptr; Rec : Node_Id; Typ : Entity_Id) return Node_Id;
88 -- Create an access to the Dispatch Table by using the Tag field
89 -- of a tagged record : Acc_Dt (Rec.tag).all
91 function Make_Implicit_If_Statement
94 Then_Statements : List_Id;
95 Elsif_Parts : List_Id := No_List;
96 Else_Statements : List_Id := No_List) return Node_Id;
97 pragma Inline (Make_Implicit_If_Statement);
98 -- This function makes an N_If_Statement node whose fields are filled
99 -- in with the indicated values (see Sinfo), and whose Sloc field is
100 -- is set to Sloc (Node). The effect is identical to calling function
101 -- Nmake.Make_If_Statement except that there is a check for restriction
102 -- No_Implicit_Conditionals, and if this restriction is being violated,
103 -- an error message is posted on Node.
105 function Make_Implicit_Label_Declaration
107 Defining_Identifier : Node_Id;
108 Label_Construct : Node_Id) return Node_Id;
109 -- Used to contruct an implicit label declaration node, including setting
110 -- the proper Label_Construct field (since Label_Construct is a semantic
111 -- field, the normal call to Make_Implicit_Label_Declaration does not
114 function Make_Implicit_Loop_Statement
116 Statements : List_Id;
117 Identifier : Node_Id := Empty;
118 Iteration_Scheme : Node_Id := Empty;
119 Has_Created_Identifier : Boolean := False;
120 End_Label : Node_Id := Empty) return Node_Id;
121 -- This function makes an N_Loop_Statement node whose fields are filled
122 -- in with the indicated values (see Sinfo), and whose Sloc field is
123 -- is set to Sloc (Node). The effect is identical to calling function
124 -- Nmake.Make_Loop_Statement except that there is a check for restrictions
125 -- No_Implicit_Loops and No_Implicit_Conditionals (the first applying in
126 -- all cases, and the second only for while loops), and if one of these
127 -- restrictions is being violated, an error message is posted on Node.
129 function Make_Integer_Literal
131 Intval : Int) return Node_Id;
132 pragma Inline (Make_Integer_Literal);
133 -- A convenient form of Make_Integer_Literal taking Int instead of Uint
135 function Make_Raise_Constraint_Error
137 Condition : Node_Id := Empty;
138 Reason : RT_Exception_Code) return Node_Id;
139 pragma Inline (Make_Raise_Constraint_Error);
140 -- A convenient form of Make_Raise_Constraint_Error where the Reason
141 -- is given simply as an enumeration value, rather than a Uint code.
143 function Make_Raise_Program_Error
145 Condition : Node_Id := Empty;
146 Reason : RT_Exception_Code) return Node_Id;
147 pragma Inline (Make_Raise_Program_Error);
148 -- A convenient form of Make_Raise_Program_Error where the Reason
149 -- is given simply as an enumeration value, rather than a Uint code.
151 function Make_Raise_Storage_Error
153 Condition : Node_Id := Empty;
154 Reason : RT_Exception_Code) return Node_Id;
155 pragma Inline (Make_Raise_Storage_Error);
156 -- A convenient form of Make_Raise_Storage_Error where the Reason
157 -- is given simply as an enumeration value, rather than a Uint code.
159 function Make_Unsuppress_Block
162 Stmts : List_Id) return Node_Id;
163 -- Build a block with a pragma Suppress on 'Check'. Stmts is the
164 -- statements list that needs protection against the check
166 function New_Constraint_Error (Loc : Source_Ptr) return Node_Id;
167 -- This function builds a tree corresponding to the Ada statement
168 -- "raise Constraint_Error" and returns the root of this tree,
169 -- the N_Raise_Statement node.
171 function New_External_Name
172 (Related_Id : Name_Id;
173 Suffix : Character := ' ';
174 Suffix_Index : Int := 0;
175 Prefix : Character := ' ') return Name_Id;
176 function New_External_Name
177 (Related_Id : Name_Id;
179 Suffix_Index : Int := 0;
180 Prefix : Character := ' ') return Name_Id;
181 -- Builds a new entry in the names table of the form:
183 -- [Prefix &] Related_Id [& Suffix] [& Suffix_Index]
185 -- Prefix is prepended only if Prefix is non-blank (in which case it
186 -- must be an upper case letter other than O,Q,U,W (which are used for
187 -- identifier encoding, see Namet), and T is reserved for use by implicit
188 -- types. and X is reserved for use by debug type encoding (see package
189 -- Exp_Dbug). Note: the reason that Prefix is last is that it is almost
190 -- always omitted. The notable case of Prefix being non-null is when
191 -- it is 'T' for an implicit type.
193 -- Suffix_Index'Image is appended only if the value of Suffix_Index is
194 -- positive, or if Suffix_Index is negative 1, then a unique serialized
195 -- suffix is added. If Suffix_Index is zero, then no index is appended.
197 -- Suffix is also a single upper case letter other than O,Q,U,W,X and is a
198 -- required parameter (T is permitted). The constructed name is stored
199 -- using Find_Name so that it can be located using a subsequent Find_Name
200 -- operation (i.e. it is properly hashed into the names table). The upper
201 -- case letter given as the Suffix argument ensures that the name does
202 -- not clash with any Ada identifier name. These generated names are
203 -- permitted, but not required, to be made public by setting the flag
204 -- Is_Public in the associated entity.
206 function New_External_Name
208 Suffix_Index : Nat) return Name_Id;
209 -- Builds a new entry in the names table of the form
210 -- Suffix & Suffix_Index'Image
211 -- where Suffix is a single upper case letter other than O,Q,U,W,X and is
212 -- a required parameter (T is permitted). The constructed name is stored
213 -- using Find_Name so that it can be located using a subsequent Find_Name
214 -- operation (i.e. it is properly hashed into the names table). The upper
215 -- case letter given as the Suffix argument ensures that the name does
216 -- not clash with any Ada identifier name. These generated names are
217 -- permitted, but not required, to be made public by setting the flag
218 -- Is_Public in the associated entity.
220 function New_Internal_Name (Id_Char : Character) return Name_Id;
221 -- Id_Char is an upper case letter other than O,Q,U,W (which are reserved
222 -- for identifier encoding (see Namet package for details) and X which is
223 -- used for debug encoding (see Exp_Dbug). The letter T is permitted, but
224 -- is reserved by convention for the case of internally generated types.
225 -- The result of the call is a new generated unique name of the form XyyyU
226 -- where X is Id_Char, yyy is a unique serial number, and U is either a
227 -- lower case s or b indicating if the current unit is a spec or a body.
229 -- The name is entered into the names table using Name_Enter rather than
230 -- Name_Find, because there can never be a need to locate the entry using
231 -- the Name_Find procedure later on. Names created by New_Internal_Name
232 -- are guaranteed to be consistent from one compilation to another (i.e.
233 -- if the identical unit is compiled with a semantically consistent set
234 -- of sources, the numbers will be consistent. This means that it is fine
235 -- to use these as public symbols.
237 function New_Occurrence_Of
239 Loc : Source_Ptr) return Node_Id;
240 -- New_Occurrence_Of creates an N_Identifier node which is an
241 -- occurrence of the defining identifier which is passed as its
242 -- argument. The Entity and Etype of the result are set from
243 -- the given defining identifier as follows: Entity is simply
244 -- a copy of Def_Id. Etype is a copy of Def_Id for types, and
245 -- a copy of the Etype of Def_Id for other entities.
247 function New_Reference_To
249 Loc : Source_Ptr) return Node_Id;
250 -- This is like New_Occurrence_Of, but it does not set the Etype field.
251 -- It is used from the expander, where Etype fields are generally not set,
252 -- since they are set when the expanded tree is reanalyzed.
254 function New_Suffixed_Name
255 (Related_Id : Name_Id;
256 Suffix : String) return Name_Id;
257 -- This function is used to create special suffixed names used by the
258 -- debugger. Suffix is a string of upper case letters, used to construct
259 -- the required name. For instance, the special type used to record the
260 -- fixed-point small is called typ_SMALL where typ is the name of the
261 -- fixed-point type (as passed in Related_Id), and Suffix is "SMALL".
263 function OK_Convert_To (Typ : Entity_Id; Expr : Node_Id) return Node_Id;
264 -- Like Convert_To, except that a conversion node is always generated,
265 -- and the Conversion_OK flag is set on this conversion node.
267 function Unchecked_Convert_To
269 Expr : Node_Id) return Node_Id;
270 -- Like Convert_To, but if a conversion is actually needed, constructs
271 -- an N_Unchecked_Type_Conversion node to do the required conversion.
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