g-dirope.ads: Minor reformatting Document that bounds of result of Base_Name match the input...
2005-09-01 Robert Dewar <dewar@adacore.com> Arnaud Charlet <charlet@adacore.com> * g-dirope.ads: Minor reformatting Document that bounds of result of Base_Name match the input index positions. Add documentation on environment variable syntax for Expand_Path * gnat_ugn.texi: Update documentation to include mention of -m switches Document new treatment of wide characters in max line length style check. Remove -gnatL/-gnatZ switches, no longer used. Add note on pragmas Assertion_Policy and Debug_Policy in discussion of -gnata switch. * gnat_rm.texi: Add doc for two argument form of pragma Float_Representation. Add documentation for pragma No_Strict_Aliasing Add note that explicit component clause overrides pragma Pack. Add documentation of pragma Debug_Policy From-SVN: r103891
This commit is contained in:
Robert Dewar
Arnaud Charlet
parent
bbb9131042
commit
c1cd0d9675
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@ -6,7 +6,7 @@
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1998-2004 Ada Core Technologies, Inc. --
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-- Copyright (C) 1998-2005 Ada Core Technologies, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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@ -94,7 +94,7 @@ package GNAT.Directory_Operations is
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-- Dir_Name. Raises Directory_Error if Dir_Name cannot be removed.
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function Get_Current_Dir return Dir_Name_Str;
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-- Returns the current working directory for the execution environment.
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-- Returns the current working directory for the execution environment
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procedure Get_Current_Dir (Dir : out Dir_Name_Str; Last : out Natural);
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-- Returns the current working directory for the execution environment
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@ -137,6 +137,10 @@ package GNAT.Directory_Operations is
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-- The comparison of Suffix is case-insensitive on systems such as Windows
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-- and VMS where the file search is case-insensitive (e.g. on such systems,
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-- Base_Name ("/Users/AdaCore/BB12.patch", ".Patch") returns "BB12").
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--
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-- Note that the index bounds of the result match the corresponding indexes
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-- in the Path string (you cannot assume that the lower bound of the
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-- returned string is one).
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function File_Extension (Path : Path_Name) return String;
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-- Return the file extension. This is defined as the string after the
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@ -150,16 +154,7 @@ package GNAT.Directory_Operations is
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-- path information. This is equivalent to Base_Name with default Extension
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-- value.
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type Path_Style is
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(UNIX,
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-- Use '/' as the directory separator. The default on Unix systems
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-- and on OpenVMS.
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DOS,
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-- Use '\' as the directory separator. The default on Windows.
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System_Default);
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type Path_Style is (UNIX, DOS, System_Default);
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function Format_Pathname
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(Path : Path_Name;
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Style : Path_Style := System_Default) return Path_Name;
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@ -168,26 +163,20 @@ package GNAT.Directory_Operations is
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-- function will help to provide a consistent naming scheme running for
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-- different environments. If style is set to System_Default the routine
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-- will use the default directory separator on the running environment.
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--
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-- The Style argument indicates the syntax to be used for path names:
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--
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-- UNIX
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-- Use '/' as the directory separator. The default on Unix systems
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-- and on OpenVMS.
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--
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-- DOS
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-- Use '\' as the directory separator. The default on Windows.
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--
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-- System_Default
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-- Use the default style for the current system
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type Environment_Style is
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(UNIX,
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-- Environment variables and OpenVMS logical names use $ as prefix and
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-- can use curly brackets as in ${HOME}/mydir. If there is no closing
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-- curly bracket for an opening one then translation is done, so for
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-- example ${VAR/toto is returned as ${VAR/toto.
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DOS,
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-- Environment variables uses % as prefix and suffix
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-- (e.g. %HOME%/mydir). The name DOS refer to "DOS-like" environment.
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-- This includes al Windows systems.
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Both,
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-- Recognize both forms described above.
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System_Default);
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-- Uses either UNIX on Unix and OpenVMS systems, or DOS on Windows and
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-- OS/2 depending on the running environment.
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type Environment_Style is (UNIX, DOS, Both, System_Default);
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function Expand_Path
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(Path : Path_Name;
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Mode : Environment_Style := System_Default) return Path_Name;
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@ -198,6 +187,29 @@ package GNAT.Directory_Operations is
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-- variable does not exists the variable will be replaced by the empty
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-- string. Two dollar or percent signs are replaced by a single
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-- dollar/percent sign. Note that a variable must start with a letter.
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--
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-- The Mode argument indicates the recognized syntax for environment
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-- variables as follows:
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--
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-- UNIX
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-- Environment variables and OpenVMS logical names use $ as prefix and
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-- can use curly brackets as in ${HOME}/mydir. If there is no closing
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-- curly bracket for an opening one then no translation is done, so for
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-- example ${VAR/toto is returned as ${VAR/toto. The use of {} brackets
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-- is required if the environment variable name contains other than
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-- alphanumeric characters.
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--
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-- DOS
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-- Environment variables uses % as prefix and suffix (e.g. %HOME%/dir).
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-- The name DOS refer to "DOS-like" environment. This includes all
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-- Windows systems.
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--
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-- Both
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-- Recognize both forms described above.
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--
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-- System_Default
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-- Uses either UNIX on Unix and OpenVMS systems, or DOS on Windows and
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-- OS/2 depending on the running environment.
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---------------
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-- Iterators --
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@ -215,7 +227,7 @@ package GNAT.Directory_Operations is
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-- Raises Directory_Error if Dir has not be opened (Dir = Null_Dir).
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function Is_Open (Dir : Dir_Type) return Boolean;
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-- Returns True if Dir is open, or False otherwise.
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-- Returns True if Dir is open, or False otherwise
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procedure Read
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(Dir : in out Dir_Type;
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@ -251,6 +263,6 @@ private
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Dir_Seps : constant Ada.Strings.Maps.Character_Set :=
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Ada.Strings.Maps.To_Set ("/\");
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-- UNIX and DOS style directory separators.
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-- UNIX and DOS style directory separators
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end GNAT.Directory_Operations;
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@ -118,6 +118,7 @@ Implementation Defined Pragmas
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* Pragma CPP_Virtual::
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* Pragma CPP_Vtable::
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* Pragma Debug::
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* Pragma Debug_Policy::
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* Pragma Detect_Blocking::
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* Pragma Elaboration_Checks::
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* Pragma Eliminate::
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@ -156,6 +157,7 @@ Implementation Defined Pragmas
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* Pragma Machine_Attribute::
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* Pragma Main_Storage::
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* Pragma No_Return::
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* Pragma No_Strict_Aliasing ::
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* Pragma Normalize_Scalars::
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* Pragma Obsolescent::
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* Pragma Passive::
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@ -649,6 +651,7 @@ consideration, the use of these pragmas should be minimized.
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* Pragma CPP_Virtual::
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* Pragma CPP_Vtable::
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* Pragma Debug::
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* Pragma Debug_Policy::
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* Pragma Detect_Blocking::
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* Pragma Elaboration_Checks::
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* Pragma Eliminate::
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@ -687,6 +690,7 @@ consideration, the use of these pragmas should be minimized.
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* Pragma Machine_Attribute::
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* Pragma Main_Storage::
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* Pragma No_Return::
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* Pragma No_Strict_Aliasing::
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* Pragma Normalize_Scalars::
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* Pragma Obsolescent::
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* Pragma Passive::
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@ -1362,12 +1366,45 @@ PROCEDURE_CALL_WITHOUT_SEMICOLON ::=
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The argument has the syntactic form of an expression, meeting the
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syntactic requirements for pragmas.
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If assertions are not enabled on the command line, this pragma has no
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effect. If asserts are enabled, the semantics of the pragma is exactly
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If debug pragmas are not enabled, this pragma has no
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effect. If debug pragmas are enabled, the semantics of the pragma is exactly
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equivalent to the procedure call statement corresponding to the argument
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with a terminating semicolon. Pragmas are permitted in sequences of
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declarations, so you can use pragma @code{Debug} to intersperse calls to
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debug procedures in the middle of declarations.
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debug procedures in the middle of declarations. Debug pragmas can be
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enabled either by use of the command line switch @code{-gnata} or by use
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of the configuration pragma @code{Debug_Policy}.
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@node Pragma Debug_Policy
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@unnumberedsec Pragma Debug_Policy
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@findex Debug_Policy
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@noindent
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Syntax:
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@smallexample @c ada
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pragma Debug_Policy (CHECK | IGNORE);
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@end smallexample
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@noindent
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If the argument is @code{CHECK}, then pragma @code{DEBUG} is enabled.
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If the argument is @code{IGNORE}, then pragma @code{DEBUG} is ignored.
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This pragma overrides the effect of the @code{-gnata} switch on the
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command line.
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If debug pragmas are not enabled, this pragma has no
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effect. If debug pragmas are enabled, the semantics of the pragma is exactly
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equivalent to the procedure call statement corresponding to the argument
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with a terminating semicolon. Pragmas are permitted in sequences of
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declarations, so you can use pragma @code{Debug} to intersperse calls to
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debug procedures in the middle of declarations. Debug pragmas can be
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enabled either by use of the command line switch @code{-gnata} or by use
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of the configuration pragma @code{Debug_Policy}.
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@node Pragma Detect_Blocking
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@unnumberedsec Pragma Detect_Blocking
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@ -1981,13 +2018,13 @@ execution, hence the name.
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Syntax:
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@smallexample @c ada
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pragma Float_Representation (FLOAT_REP);
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pragma Float_Representation (FLOAT_REP[, float_type_LOCAL_NAME]);
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FLOAT_REP ::= VAX_Float | IEEE_Float
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@end smallexample
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@noindent
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This pragma
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In the one argument form, this pragma is a configuration pragma which
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allows control over the internal representation chosen for the predefined
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floating point types declared in the packages @code{Standard} and
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@code{System}. On all systems other than OpenVMS, the argument must
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@ -1998,6 +2035,24 @@ the standard runtime libraries be recompiled. See the
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description of the @code{GNAT LIBRARY} command in the OpenVMS version
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of the GNAT Users Guide for details on the use of this command.
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The two argument form specifies the representation to be used for
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the specified floating-poin type. On all systems other than OpenVMS,
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the argument must
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be @code{IEEE_Float} and the pragma has no effect. On OpenVMS, the
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argument may be @code{VAX_Float} to specify the use of the VAX float
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format, as follows:
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@itemize @bullet
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@item
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For digits values up to 6, F float format will be used.
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@item
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For digits values from 7 to 9, G float format will be used.
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@item
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For digits values from 10 to 15, F float format will be used.
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@item
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Digits values above 15 are not allowed.
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@end itemize
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@node Pragma Ident
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@unnumberedsec Pragma Ident
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@findex Ident
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@ -2670,7 +2725,7 @@ package p is
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new_name_for_i : Integer;
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pragma Linker_Alias (new_name_for_i, "i");
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end p;
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end p;
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@end smallexample
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@node Pragma Linker_Constructor
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@ -2865,6 +2920,26 @@ Another use of this pragma is to suppress incorrect warnings about
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missing returns in functions, where the last statement of a function
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statement sequence is a call to such a procedure.
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@node Pragma No_Strict_Aliasing
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@unnumberedsec Pragma No_Strict_Aliasing
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@findex No_Strict_Aliasing
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@noindent
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Syntax:
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@smallexample @c ada
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ppragma No_Strict_Aliasing [([Entity =>] type_LOCAL_NAME)];
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@end smallexample
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@noindent
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@var{type_LOCAL_NAME} must refer to an access type
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declaration in the current declarative part. The effect is to inhibit
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strict aliasing optimization for the given type. The form with no
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arguments is a configuration pragma which applies to all access types
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declared in units to which the pragma applies. For a detailed
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description of the strict aliasing optimization, and the situations
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in which it must be suppressed, see section "Optimization and Strict Aliasing"
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in the @value{EDITION} User's Guide.
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@node Pragma Normalize_Scalars
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@unnumberedsec Pragma Normalize_Scalars
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@findex Normalize_Scalars
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@ -4033,7 +4108,7 @@ Note that if a warning is desired for all calls to a given subprogram,
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regardless of whether they occur in the same unit as the subprogram
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declaration, then this pragma should not be used (calls from another
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unit would not be flagged); pragma Obsolescent can be used instead
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for this purpose (@xref{Pragma Obsolescent}).
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for this purpose, see @xref{Pragma Obsolescent}.
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@node Pragma Unreserve_All_Interrupts
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@unnumberedsec Pragma Unreserve_All_Interrupts
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@ -4245,7 +4320,7 @@ Address of such an entity, for example to guard potential references,
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as shown in the example below.
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Some file formats do not support weak symbols so not all target machines
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support this pragma.
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support this pragma.
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@smallexample @c ada
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-- Example of the use of pragma Weak_External
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@ -9167,7 +9242,7 @@ Only @code{Size} may be specified for such types.
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@cindex Component_Size Clause
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@noindent
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Normally, the value specified in a component clause must be consistent
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Normally, the value specified in a component size clause must be consistent
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with the subtype of the array component with regard to size and alignment.
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In other words, the value specified must be at least equal to the size
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of this subtype, and must be a multiple of the alignment value.
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@ -9189,6 +9264,10 @@ then the resulting array has a length of 31 bytes (248 bits = 8 * 31).
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Of course access to the components of such an array is considerably
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less efficient than if the natural component size of 32 is used.
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Note that there is no point in giving both a component size clause
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and a pragma Pack for the same array type. if such duplicate
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clauses are given, the pragma Pack will be ignored.
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@node Bit_Order Clauses
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@section Bit_Order Clauses
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@cindex Bit_Order Clause
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@ -331,6 +331,7 @@ Performance Considerations
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* Optimization Levels::
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* Debugging Optimized Code::
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* Inlining of Subprograms::
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* Other Optimization Switches::
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* Optimization and Strict Aliasing::
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@ifset vms
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* Coverage Analysis::
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@ -3752,7 +3753,8 @@ Allow full Ada 2005 features.
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@item -gnata
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@cindex @option{-gnata} (@command{gcc})
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Assertions enabled. @code{Pragma Assert} and @code{pragma Debug} to be
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activated.
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activated. Note that these pragmas can also be controlled using the
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configuration pragmas @code{Assertion_Policy} and @code{Debug_Policy}.
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@item -gnatA
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@cindex @option{-gnatA} (@command{gcc})
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@ -3865,11 +3867,6 @@ Limit file names to @var{n} (1-999) characters ^(@code{k} = krunch)^^.
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@cindex @option{-gnatl} (@command{gcc})
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Output full source listing with embedded error messages.
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@item -gnatL
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@cindex @option{-gnatL} (@command{gcc})
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This switch is deprecated. You can use @option{--RTS=sjlj} instead to enable
|
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@code{setjmp/longjmp} exception mechanism.
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@item -gnatm=@var{n}
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@cindex @option{-gnatm} (@command{gcc})
|
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Limit number of detected error or warning messages to @var{n}
|
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|
|
@ -3996,10 +3993,6 @@ Distribution stub generation and compilation
|
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to be generated and compiled).
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@end ifset
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@item -gnatZ
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This switch is deprecated. When zero cost exception handling is not the
|
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default and this is supported, you can use @option{--RTS=zcx} instead.
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|
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@item ^-I^/SEARCH=^@var{dir}
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@cindex @option{^-I^/SEARCH^} (@command{gcc})
|
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@cindex RTL
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|
|
@ -4054,16 +4047,13 @@ No optimization, the default setting if no @option{-O} appears
|
|||
|
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@item n = 1
|
||||
Normal optimization, the default if you specify @option{-O} without
|
||||
an operand.
|
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an operand. A good compromise between code quality and compilation
|
||||
time.
|
||||
|
||||
@item n = 2
|
||||
Extensive optimization
|
||||
Extensive optimization, may improve execution time, possibly at the cost of
|
||||
substantially increased compilation time.
|
||||
|
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@item n = 3
|
||||
Extensive optimization with automatic inlining of subprograms not
|
||||
specified by pragma @code{Inline}. This applies only to
|
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inlining within a unit. For details on control of inlining
|
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see @ref{Subprogram Inlining Control}.
|
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@end table
|
||||
@end ifclear
|
||||
|
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|
|
@ -4094,11 +4084,6 @@ Perform some optimizations, but omit ones that are costly.
|
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@item DEVELOPMENT
|
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Same as @code{SOME}.
|
||||
|
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@item INLINING
|
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Full optimization, and also attempt automatic inlining of small
|
||||
subprograms within a unit even when pragma @code{Inline}
|
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is not specified (@pxref{Inlining of Subprograms}).
|
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|
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@item UNROLL_LOOPS
|
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Try to unroll loops. This keyword may be specified together with
|
||||
any keyword above other than @code{NONE}. Loop unrolling
|
||||
|
|
@ -5537,10 +5522,10 @@ If the ^letter m^word LINE_LENGTH^ appears in the string after @option{-gnaty}
|
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then the length of source lines must not exceed 79 characters, including
|
||||
any trailing blanks. The value of 79 allows convenient display on an
|
||||
80 character wide device or window, allowing for possible special
|
||||
treatment of 80 character lines. Note that this count is of raw
|
||||
treatment of 80 character lines. Note that this count is of
|
||||
characters in the source text. This means that a tab character counts
|
||||
as one character in this count and a wide character sequence counts as
|
||||
several characters (however many are needed in the encoding).
|
||||
as one character in this count but a wide character sequence counts as
|
||||
a single character (however many bytes are needed in the encoding).
|
||||
|
||||
@item ^Mnnn^MAX_LENGTH=nnn^
|
||||
@emph{Set maximum line length.}
|
||||
|
|
@ -8911,7 +8896,9 @@ some guidelines on debugging optimized code.
|
|||
* Optimization Levels::
|
||||
* Debugging Optimized Code::
|
||||
* Inlining of Subprograms::
|
||||
* Other Optimization Switches::
|
||||
* Optimization and Strict Aliasing::
|
||||
|
||||
@ifset vms
|
||||
* Coverage Analysis::
|
||||
@end ifset
|
||||
|
|
@ -9019,8 +9006,16 @@ No optimization (the default);
|
|||
generates unoptimized code but has
|
||||
the fastest compilation time.
|
||||
|
||||
Note that many other compilers do fairly extensive optimization
|
||||
even if "no optimization" is specified. When using gcc, it is
|
||||
very unusual to use ^-O0^/OPTIMIZE=NONE^ for production if
|
||||
execution time is of any concern, since ^-O0^/OPTIMIZE=NONE^
|
||||
really does mean no optimization at all. This difference between
|
||||
gcc and other compilers should be kept in mind when doing
|
||||
performance comparisons.
|
||||
|
||||
@item ^-O1^/OPTIMIZE=SOME^
|
||||
Medium level optimization;
|
||||
Moderate optimization;
|
||||
optimizes reasonably well but does not
|
||||
degrade compilation time significantly.
|
||||
|
||||
|
|
@ -9309,6 +9304,20 @@ that you should not automatically assume that @option{-O3} is better than
|
|||
@option{-O2}, and indeed you should use @option{-O3} only if tests show that
|
||||
it actually improves performance.
|
||||
|
||||
@node Other Optimization Switches
|
||||
@subsection Other Optimization Switches
|
||||
@cindex Optimization Switches
|
||||
|
||||
Since @code{GNAT} uses the @code{gcc} back end, all the specialized
|
||||
@code{gcc} optimization switches are potentially usable. These switches
|
||||
have not been extensively tested with GNAT but can generally be expected
|
||||
to work. Examples of switches in this category are
|
||||
@option{-funroll-loops} and
|
||||
the various target-specific @option{-m} options (in particular, it has been
|
||||
observed that @option{-march=pentium4} can significantly improve performance
|
||||
on appropriate machines. For full details of these switches, see the
|
||||
@code{gcc} manual.
|
||||
|
||||
@node Optimization and Strict Aliasing
|
||||
@subsection Optimization and Strict Aliasing
|
||||
@cindex Aliasing
|
||||
|
|
|
|||
Loading…
Reference in New Issue