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Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/doc/extend.texi | 335 | ||||
| -rw-r--r-- | gcc/doc/gcc.texi | 1 |
3 files changed, 341 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 23c2c4d..219130d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2001-08-10 Richard Henderson <rth@redhat.com> + + * doc/extend.texi (C Implementation): New chapter. + * doc/gcc.texi (Top): Link it in. + 2001-08-10 Andrew Cagney <ac131313@redhat.com> * doc/install.texi (Specific): Fix CVS merge botch. diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 293bce6..23deda1 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -2,6 +2,341 @@ @c This is part of the GCC manual. @c For copying conditions, see the file gcc.texi. +@node C Implementation +@chapter C Implementation-defined behavior +@cindex implementation-defined behavior, C language + +A conforming implementation of ISO C is required to document its +choice of behavior in each of the areas that are designated +``implementation defined.'' The following lists all such areas, +along with the section number from the ISO/IEC 9899:1999 standard. + +@menu +* Translation implementation:: +* Environment implementation:: +* Identifiers implementation:: +* Characters implementation:: +* Integers implementation:: +* Floating point implementation:: +* Arrays and pointers implementation:: +* Hints implementation:: +* Structures unions enumerations and bit-fields implementation:: +* Qualifiers implementation:: +* Preprocessing directives implementation:: +* Library functions implementation:: +* Architecture implementation:: +* Locale-specific behavior implementation:: +@end menu + +@node Translation implementation +@section Translation + +@itemize @bullet +@item +@cite{How a diagnostic is identified (3.10, 5.1.1.3).} + +@item +@cite{Whether each nonempty sequence of white-space characters other than +new-line is retained or replaced by one space character in translation +phase 3 (5.1.1.2).} +@end itemize + +@node Environment implementation +@section Environment + +The behavior of these points are dependant on the implementation +of the C library, and are not defined by GCC itself. + +@node Identifiers implementation +@section Identifiers + +@itemize @bullet +@item +@cite{Which additional multibyte characters may appear in identifiers +and their correspondence to universal character names (6.4.2).} + +@item +@cite{The number of significant initial characters in an identifier +(5.2.4.1, 6.4.2).} +@end itemize + +@node Characters implementation +@section Characters + +@itemize @bullet +@item +@cite{The number of bits in a byte (3.6).} + +@item +@cite{The values of the members of the execution character set (5.2.1).} + +@item +@cite{The unique value of the member of the execution character set produced +for each of the standard alphabetic escape sequences (5.2.2).} + +@item +@cite{The value of a @code{char} object into which has been stored any +character other than a member of the basic execution character set (6.2.5).} + +@item +@cite{Which of @code{signed char} or @code{unsigned char} has the same range, +representation, and behavior as ``plain'' char (6.2.5, 6.3.1.1).} + +@item +@cite{The mapping of members of the source character set (in character +constants and string literals) to members of the execution character +set (6.4.4.4, 5.1.1.2).} + +@item +@cite{The value of an integer character constant containing more than one +character or containing a character or escape sequence that does not map +to a single-byte execution character (6.4.4.4).} + +@item +@cite{The value of a wide character constant containing more than one +multibyte character, or containing a multibyte character or escape +sequence not represented in the extended execution character set (6.4.4.4).} + +@item +@cite{The current locale used to convert a wide character constant consisting +of a single multibyte character that maps to a member of the extended +execution character set into a corresponding wide character code (6.4.4.4).} + +@item +@cite{The current locale used to convert a wide string literal into +corresponding wide character codes (6.4.5).} + +@item +@cite{The value of a string literal containing a multibyte character or escape +sequence not represented in the execution character set (6.4.5).} +@end itemize + +@node Integers implementation +@section Integers + +@itemize @bullet +@item +@cite{Any extended integer types that exist in the implementation (6.2.5).} + +@item +@cite{Whether signed integer types are represented using sign and magnitude, +two's complement, or one's complement, and whether the extraordinary value +is a trap representation or an ordinary value (6.2.6.2).} + +@item +@cite{The rank of any extended integer type relative to another extended +integer type with the same precision (6.3.1.1).} + +@item +@cite{The result of, or the signal raised by, converting an integer to a +signed integer type when the value cannot be represented in an object of +that type (6.3.1.3).} + +@item +@cite{The results of some bitwise operations on signed integers (6.5).} +@end itemize + +@node Floating point implementation +@section Floating point + +@itemize @bullet +@item +@cite{The accuracy of the floating-point operations and of the library +functions in @file{<math.h>} and @file{<complex.h>} that return floating-point +results (5.2.4.2.2).} + +@item +@cite{The rounding behaviors characterized by non-standard values +of @code{FLT_ROUNDS} (5.2.4.2.2).} + +@item +@cite{The evaluation methods characterized by non-standard negative +values of @code{FLT_EVAL_METHOD} (5.2.4.2.2).} + +@item +@cite{The direction of rounding when an integer is converted to a +floating-point number that cannot exactly represent the original +value (6.3.1.4).} + +@item +@cite{The direction of rounding when a floating-point number is +converted to a narrower floating-point number (6.3.1.5).} + +@item +@cite{How the nearest representable value or the larger or smaller +representable value immediately adjacent to the nearest representable +value is chosen for certain floating constants (6.4.4.2).} + +@item +@cite{Whether and how floating expressions are contracted when not +disallowed by the @code{FP_CONTRACT} pragma (6.5).} + +@item +@cite{The default state for the @code{FENV_ACCESS} pragma (7.6.1).} + +@item +@cite{Additional floating-point exceptions, rounding modes, environments, +and classifications, and their macro names (7.6, 7.12).} + +@item +@cite{The default state for the @code{FP_CONTRACT} pragma (7.12.2).} + +@item +@cite{Whether the ``inexact'' floating-point exception can be raised +when the rounded result actually does equal the mathematical result +in an IEC 60559 conformant implementation (F.9).} + +@item +@cite{Whether the ``underflow'' (and ``inexact'') floating-point +exception can be raised when a result is tiny but not inexact in an +IEC 60559 conformant implementation (F.9).} + +@end itemize + +@node Arrays and pointers implementation +@section Arrays and pointers + +@itemize @bullet +@item +@cite{The result of converting a pointer to an integer or +vice versa (6.3.2.3).} + +@item +@cite{The size of the result of subtracting two pointers to elements +of the same array (6.5.6).} + +@end itemize + +@node Hints implementation +@section Hints + +@itemize @bullet +@item +@cite{The extent to which suggestions made by using the @code{register} +storage-class specifier are effective (6.7.1).} + +@item +@cite{The extent to which suggestions made by using the inline function +specifier are effective (6.7.4).} + +@end itemize + +@node Structures unions enumerations and bit-fields implementation +@section Structures, unions, enumerations, and bit-fields + +@itemize @bullet +@item +@cite{Whether a ``plain'' int bit-field is treated as a @code{signed int} +bit-field or as an @code{unsigned int} bit-field (6.7.2, 6.7.2.1).} + +@item +@cite{Allowable bit-field types other than @code{_Bool}, @code{signed int}, +and @code{unsigned int} (6.7.2.1).} + +@item +@cite{Whether a bit-field can straddle a storage-unit boundary (6.7.2.1).} + +@item +@cite{The order of allocation of bit-fields within a unit (6.7.2.1).} + +@item +@cite{The alignment of non-bit-field members of structures (6.7.2.1).} + +@item +@cite{The integer type compatible with each enumerated type (6.7.2.2).} + +@end itemize + +@node Qualifiers implementation +@section Qualifiers + +@itemize @bullet +@item +@cite{What constitutes an access to an object that has volatile-qualified +type (6.7.3).} + +@end itemize + +@node Preprocessing directives implementation +@section Preprocessing directives + +@itemize @bullet +@item +@cite{How sequences in both forms of header names are mapped to headers +or external source file names (6.4.7).} + +@item +@cite{Whether the value of a character constant in a constant expression +that controls conditional inclusion matches the value of the same character +constant in the execution character set (6.10.1).} + +@item +@cite{Whether the value of a single-character character constant in a +constant expression that controls conditional inclusion may have a +negative value (6.10.1).} + +@item +@cite{The places that are searched for an included @samp{<>} delimited +header, and how the places are specified or the header is +identified (6.10.2).} + +@item +@cite{How the named source file is searched for in an included @samp{""} +delimited header (6.10.2).} + +@item +@cite{The method by which preprocessing tokens (possibly resulting from +macro expansion) in a @code{#include} directive are combined into a header +name (6.10.2).} + +@item +@cite{The nesting limit for @code{#include} processing (6.10.2).} + +@item +@cite{Whether the @samp{#} operator inserts a @samp{\} character before +the @samp{\} character that begins a universal character name in a +character constant or string literal (6.10.3.2).} + +@item +@cite{The behavior on each recognized non-@code{STDC #pragma} +directive (6.10.6).} + +@item +@cite{The definitions for @code{__DATE__} and @code{__TIME__} when +respectively, the date and time of translation are not available (6.10.8).} + +@end itemize + +@node Library functions implementation +@section Library functions + +The behavior of these points are dependant on the implementation +of the C library, and are not defined by GCC itself. + +@node Architecture implementation +@section Architecture + +@itemize @bullet +@item +@cite{The values or expressions assigned to the macros specified in the +headers @file{<float.h>}, @file{<limits.h>}, and @file{<stdint.h>} +(5.2.4.2, 7.18.2, 7.18.3).} + +@item +@cite{The number, order, and encoding of bytes in any object +(when not explicitly specified in this International Standard) (6.2.6.1).} + +@item +@cite{The value of the result of the sizeof operator (6.5.3.4).} + +@end itemize + +@node Locale-specific behavior implementation +@section Locale-specific behavior + +The behavior of these points are dependant on the implementation +of the C library, and are not defined by GCC itself. + @node C Extensions @chapter Extensions to the C Language Family @cindex extensions, C language diff --git a/gcc/doc/gcc.texi b/gcc/doc/gcc.texi index 252f934..4435742 100644 --- a/gcc/doc/gcc.texi +++ b/gcc/doc/gcc.texi @@ -254,6 +254,7 @@ bugs. It corresponds to GCC version 3.1. * Standards:: Language standards supported by GCC. * Invoking GCC:: Command options supported by @samp{gcc}. * Installation:: How to configure, compile and install GCC. +* C Implementation:: How GCC implements the ISO C specification. * C Extensions:: GNU extensions to the C language family. * C++ Extensions:: GNU extensions to the C++ language. * Objective-C:: GNU Objective-C runtime features. |