-- --
-- S p e c --
-- --
--- $Revision$
--- --
--- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-with Types; use Types;
+with Namet; use Namet;
+with Types; use Types;
+with Uintp; use Uintp;
+with Urealp; use Urealp;
package Scans is
-- The class column in this table indicates the token classes which
-- apply to the token, as defined by subsquent subtype declarations.
- -- Note: the coding in SCN depends on the fact that the first entry in
- -- this type declaration is *not* for a reserved word. For details on
- -- why there is this requirement, see Scn.Initialize_Scanner.
+ -- Note: Namet.Is_Keyword_Name depends on the fact that the first entry in
+ -- this type declaration is *not* for a reserved word. For details on why
+ -- there is this requirement, see Scans.Initialize_Ada_Keywords.
type Token_Type is (
Tok_Constant, -- CONSTANT Eterm, Sterm
Tok_Do, -- DO Eterm, Sterm
Tok_Is, -- IS Eterm, Sterm
+ Tok_Interface, -- INTERFACE Eterm, Sterm
Tok_Limited, -- LIMITED Eterm, Sterm
Tok_Of, -- OF Eterm, Sterm
Tok_Out, -- OUT Eterm, Sterm
Tok_Task, -- TASK Eterm, Sterm, Declk, Deckn, After_SM
Tok_Type, -- TYPE Eterm, Sterm, Declk, Deckn, After_SM
Tok_Subtype, -- SUBTYPE Eterm, Sterm, Declk, Deckn, After_SM
+ Tok_Overriding, -- OVERRIDING Eterm, Sterm, Declk, Declk, After_SM
+ Tok_Synchronized, -- SYNCHRONIZED Eterm, Sterm, Declk, Deckn, After_SM
Tok_Use, -- USE Eterm, Sterm, Declk, Deckn, After_SM
Tok_Function, -- FUNCTION Eterm, Sterm, Cunit, Declk, After_SM
Tok_Dot_Dot, -- .. Sterm, Chtok
- -- The following three entries are used only when scanning
- -- project files.
-
Tok_Project,
- Tok_Modifying,
+ Tok_Extends,
Tok_External,
+ -- These three entries represent keywords for the project file language
+ -- and can be returned only in the case of scanning project files.
+
+ Tok_Comment,
+ -- This entry is used when scanning project files (where it represents
+ -- an entire comment), and in preprocessing with the -C switch set
+ -- (where it represents just the "--" of a comment). For the project
+ -- file case, the text of the comment is stored in
+
+ Tok_End_Of_Line,
+ -- Represents an end of line. Not used during normal compilation scans
+ -- where end of line is ignored. Active for preprocessor scanning and
+ -- also when scanning project files (where it is neede because of ???)
+
+ Tok_Special,
+ -- Used only in preprocessor scanning (to represent one of the
+ -- characters '#', '$', '?', '@', '`', '\', '^', '~', or '_'. The
+ -- character value itself is stored in Scans.Special_Character.
No_Token);
-- No_Token is used for initializing Token values to indicate that
-- The following subtype declarations group the token types into classes.
-- These are used for class tests in the parser.
- subtype Token_Class_Numeric_Literal is
- Token_Type range Tok_Integer_Literal .. Tok_Real_Literal;
- -- Numeric literal
-
- subtype Token_Class_Literal is
- Token_Type range Tok_Integer_Literal .. Tok_Operator_Symbol;
- -- Literal
-
- subtype Token_Class_Lit_Or_Name is
- Token_Type range Tok_Integer_Literal .. Tok_Identifier;
-
- subtype Token_Class_Binary_Addop is
- Token_Type range Tok_Ampersand .. Tok_Plus;
- -- Binary adding operator (& + -)
-
- subtype Token_Class_Unary_Addop is
- Token_Type range Tok_Minus .. Tok_Plus;
- -- Unary adding operator (+ -)
-
- subtype Token_Class_Mulop is
- Token_Type range Tok_Asterisk .. Tok_Slash;
- -- Multiplying operator
-
- subtype Token_Class_Logop is
- Token_Type range Tok_And .. Tok_Xor;
- -- Logical operator (and, or, xor)
-
- subtype Token_Class_Relop is
- Token_Type range Tok_Less .. Tok_Box;
- -- Relational operator (= /= < <= > >= not, in plus <> to catch misuse
- -- of Pascal style not equal operator).
-
- subtype Token_Class_Name is
- Token_Type range Tok_Char_Literal .. Tok_Identifier;
- -- First token of name (4.1),
- -- (identifier, char literal, operator symbol)
-
- subtype Token_Class_Desig is
- Token_Type range Tok_Operator_Symbol .. Tok_Identifier;
- -- Token which can be a Designator (identifier, operator symbol)
-
- subtype Token_Class_Namext is
- Token_Type range Tok_Dot .. Tok_Left_Paren;
- -- Name extension tokens. These are tokens which can appear immediately
- -- after a name to extend it recursively (period, quote, left paren)
-
- subtype Token_Class_Consk is
- Token_Type range Tok_Left_Paren .. Tok_Range;
- -- Keywords which can start constraint
- -- (left paren, delta, digits, range)
-
- subtype Token_Class_Eterm is
- Token_Type range Tok_Colon_Equal .. Tok_Semicolon;
- -- Expression terminators. These tokens can never appear within a simple
- -- expression. This is used for error recovery purposes (if we encounter
- -- an error in an expression, we simply scan to the next Eterm token).
-
- subtype Token_Class_Sterm is
- Token_Type range Tok_Delta .. Tok_Dot_Dot;
- -- Simple_Expression terminators. A Simple_Expression must be followed
- -- by a token in this class, or an error message is issued complaining
- -- about a missing binary operator.
-
- subtype Token_Class_Atkwd is
- Token_Type range Tok_Delta .. Tok_Range;
- -- Attribute keywords. This class includes keywords which can be used
- -- as an Attribute_Designator, namely DELTA, DIGITS and RANGE
-
- subtype Token_Class_Cterm is
- Token_Type range Tok_EOF .. Tok_Vertical_Bar;
- -- Choice terminators. These tokens terminate a choice. This is used for
- -- error recovery purposes (if we encounter an error in a Choice, we
- -- simply scan to the next Cterm token).
-
- subtype Token_Class_Chtok is
- Token_Type range Tok_Arrow .. Tok_Dot_Dot;
- -- Choice tokens. These tokens signal a choice when used in an Aggregate
-
- subtype Token_Class_Cunit is
- Token_Type range Tok_Function .. Tok_Separate;
- -- Tokens which can begin a compilation unit
-
- subtype Token_Class_Declk is
- Token_Type range Tok_Entry .. Tok_Procedure;
- -- Keywords which start a declaration
-
- subtype Token_Class_Deckn is
- Token_Type range Tok_Entry .. Tok_Use;
- -- Keywords which start a declaration but can't start a compilation unit
-
- subtype Token_Class_After_SM is
- Token_Type range Tok_Less_Less .. Tok_EOF;
- -- Tokens which always, or almost always, appear after a semicolon. Used
- -- in the Resync_Past_Semicolon routine to avoid gobbling up stuff when
- -- a semicolon is missing. Of significance only for error recovery.
-
- subtype Token_Class_Labeled_Stmt is
- Token_Type range Tok_Begin .. Tok_While;
- -- Tokens which start labeled statements
-
- type Token_Flag_Array is array (Token_Type) of Boolean;
- Is_Reserved_Keyword : constant Token_Flag_Array := Token_Flag_Array'(
- Tok_Mod .. Tok_Rem => True,
- Tok_New .. Tok_Null => True,
- Tok_Delta .. Tok_Range => True,
- Tok_And .. Tok_Xor => True,
- Tok_In .. Tok_Not => True,
- Tok_Abstract .. Tok_Then => True,
- Tok_Abort .. Tok_Separate => True,
- others => False);
- -- Flag array used to test for reserved word
+ subtype Token_Class_Numeric_Literal is
+ Token_Type range Tok_Integer_Literal .. Tok_Real_Literal;
+ -- Numeric literal
+
+ subtype Token_Class_Literal is
+ Token_Type range Tok_Integer_Literal .. Tok_Operator_Symbol;
+ -- Literal
+
+ subtype Token_Class_Lit_Or_Name is
+ Token_Type range Tok_Integer_Literal .. Tok_Identifier;
+
+ subtype Token_Class_Binary_Addop is
+ Token_Type range Tok_Ampersand .. Tok_Plus;
+ -- Binary adding operator (& + -)
+
+ subtype Token_Class_Unary_Addop is
+ Token_Type range Tok_Minus .. Tok_Plus;
+ -- Unary adding operator (+ -)
+
+ subtype Token_Class_Mulop is
+ Token_Type range Tok_Asterisk .. Tok_Slash;
+ -- Multiplying operator
+
+ subtype Token_Class_Logop is
+ Token_Type range Tok_And .. Tok_Xor;
+ -- Logical operator (and, or, xor)
+
+ subtype Token_Class_Relop is
+ Token_Type range Tok_Less .. Tok_Box;
+ -- Relational operator (= /= < <= > >= not, in plus <> to catch misuse
+ -- of Pascal style not equal operator).
+
+ subtype Token_Class_Name is
+ Token_Type range Tok_Char_Literal .. Tok_Identifier;
+ -- First token of name (4.1),
+ -- (identifier, char literal, operator symbol)
+
+ subtype Token_Class_Desig is
+ Token_Type range Tok_Operator_Symbol .. Tok_Identifier;
+ -- Token which can be a Designator (identifier, operator symbol)
+
+ subtype Token_Class_Namext is
+ Token_Type range Tok_Dot .. Tok_Left_Paren;
+ -- Name extension tokens. These are tokens which can appear immediately
+ -- after a name to extend it recursively (period, quote, left paren)
+
+ subtype Token_Class_Consk is
+ Token_Type range Tok_Left_Paren .. Tok_Range;
+ -- Keywords which can start constraint
+ -- (left paren, delta, digits, range)
+
+ subtype Token_Class_Eterm is
+ Token_Type range Tok_Colon_Equal .. Tok_Semicolon;
+ -- Expression terminators. These tokens can never appear within a simple
+ -- expression. This is used for error recovery purposes (if we encounter
+ -- an error in an expression, we simply scan to the next Eterm token).
+
+ subtype Token_Class_Sterm is
+ Token_Type range Tok_Delta .. Tok_Dot_Dot;
+ -- Simple_Expression terminators. A Simple_Expression must be followed
+ -- by a token in this class, or an error message is issued complaining
+ -- about a missing binary operator.
+
+ subtype Token_Class_Atkwd is
+ Token_Type range Tok_Delta .. Tok_Range;
+ -- Attribute keywords. This class includes keywords which can be used
+ -- as an Attribute_Designator, namely DELTA, DIGITS and RANGE
+
+ subtype Token_Class_Cterm is
+ Token_Type range Tok_EOF .. Tok_Vertical_Bar;
+ -- Choice terminators. These tokens terminate a choice. This is used for
+ -- error recovery purposes (if we encounter an error in a Choice, we
+ -- simply scan to the next Cterm token).
+
+ subtype Token_Class_Chtok is
+ Token_Type range Tok_Arrow .. Tok_Dot_Dot;
+ -- Choice tokens. These tokens signal a choice when used in an Aggregate
+
+ subtype Token_Class_Cunit is
+ Token_Type range Tok_Function .. Tok_Separate;
+ -- Tokens which can begin a compilation unit
+
+ subtype Token_Class_Declk is
+ Token_Type range Tok_Entry .. Tok_Procedure;
+ -- Keywords which start a declaration
+
+ subtype Token_Class_Deckn is
+ Token_Type range Tok_Entry .. Tok_Use;
+ -- Keywords which start a declaration but can't start a compilation unit
+
+ subtype Token_Class_After_SM is
+ Token_Type range Tok_Less_Less .. Tok_EOF;
+ -- Tokens which always, or almost always, appear after a semicolon. Used
+ -- in the Resync_Past_Semicolon routine to avoid gobbling up stuff when
+ -- a semicolon is missing. Of significance only for error recovery.
+
+ subtype Token_Class_Labeled_Stmt is
+ Token_Type range Tok_Begin .. Tok_While;
+ -- Tokens which start labeled statements
+
+ type Token_Flag_Array is array (Token_Type) of Boolean;
+ Is_Reserved_Keyword : constant Token_Flag_Array :=
+ Token_Flag_Array'
+ (Tok_Mod .. Tok_Rem => True,
+ Tok_New .. Tok_Null => True,
+ Tok_Delta .. Tok_Range => True,
+ Tok_And .. Tok_Xor => True,
+ Tok_In .. Tok_Not => True,
+ Tok_Abstract .. Tok_Then => True,
+ Tok_Abort .. Tok_Separate => True,
+ others => False);
+ -- Flag array used to test for reserved word
+
+ procedure Initialize_Ada_Keywords;
+ -- Set up Token_Type values in Names table entries for Ada reserved
+ -- words.
--------------------------
-- Scan State Variables --
-- on the line containing the current token. This is used for error
-- recovery circuits which depend on looking at the column line up.
+ Type_Token_Location : Source_Ptr;
+ -- Within a type declaration, gives the location of the TYPE keyword that
+ -- opened the type declaration. Used in checking the end column of a record
+ -- declaration, which can line up either with the TYPE keyword, or with the
+ -- start of the line containing the RECORD keyword.
+
Checksum : Word;
-- Used to accumulate a CRC representing the tokens in the source
-- file being compiled. This CRC includes only program tokens, and
-- initialized to True, and then reset when the version number is found.
-- We do things this way to minimize the impact on comment scanning.
+ Character_Code : Char_Code;
+ -- Valid only when Token is Tok_Char_Literal
+
+ Real_Literal_Value : Ureal;
+ -- Valid only when Token is Tok_Real_Literal
+
+ Int_Literal_Value : Uint;
+ -- Valid only when Token = Tok_Integer_Literal;
+
+ String_Literal_Id : String_Id;
+ -- Id for currently scanned string value.
+ -- Valid only when Token = Tok_String_Literal or Tok_Operator_Symbol.
+
+ Wide_Character_Found : Boolean := False;
+ -- Set True if wide character found.
+ -- Valid only when Token = Tok_String_Literal.
+
+ Special_Character : Character;
+ -- Valid only when Token = Tok_Special. Returns one of the characters
+ -- '#', '$', '?', '@', '`', '\', '^', '~', or '_'.
+ --
+ -- Why only this set? What about wide characters???
+
+ Comment_Id : Name_Id := No_Name;
+ -- Valid only when Token = Tok_Comment. Store the string that follows
+ -- the "--" of a comment when scanning project files.
+ --
+ -- Is it really right for this to be a Name rather than a String, what
+ -- about the case of Wide_Wide_Characters???
+
--------------------------------------------------------
-- Procedures for Saving and Restoring the Scan State --
--------------------------------------------------------
-- Saves the current scan state for possible later restoration. Note that
-- there is no harm in saving the state and then never restoring it.
- procedure Restore_Scan_State (Saved_State : in Saved_Scan_State);
+ procedure Restore_Scan_State (Saved_State : Saved_Scan_State);
pragma Inline (Restore_Scan_State);
-- Restores a scan state saved by a call to Save_Scan_State.
-- The saved scan state must refer to the current source file.
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