Bug 10036 - Wide-character support for Fortran is missing
Summary: Wide-character support for Fortran is missing
Status: RESOLVED FIXED
Alias: None
Product: gdb
Classification: Unclassified
Component: fortran (show other bugs)
Version: unknown
: P2 normal
Target Milestone: 7.4
Assignee: Tom Tromey
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-04-06 20:18 UTC by Tobias Burnus
Modified: 2011-06-29 15:54 UTC (History)
3 users (show)

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Last reconfirmed: 2011-06-28 18:05:36


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Description Tobias Burnus 2009-04-06 20:18:50 UTC
Fortran 2003 allows and Fortran 2008 mandates support for wide-character strings
in Fortran compilers. Those are then of the type "ISO/IEC 10646-1:2000 UCS-4
character type".

To my knowledge, GCC/gfortran 4.4/4.5 is the only Fortran compiler which
supports wide strings so far.

Example program (compile with "gfortran -fbackslash"; use "\u...." and
"\U........" to enter Unicode characters).
-------------------------------------
character(kind=4) :: c
character(kind=4,len=5) :: str
c = 4_'\u00AE'
str = 4_'\u00AE\u01DD'
open(6,encoding='utf-8')
print *, c
print *, str
end
-------------------------------------

Currently, gdb prints:

(gdb) pt c
type = character(kind=4) (1)
(gdb) pt str
type = character(kind=4) (5)
(gdb) p str
$1 = (92, 117, 48, 48, 65)
(gdb) p c
$2 = (92)

(Support for entering, e.g., UTF-8 directly in the source code is planned but
not yet implemented.)

 * * *

The support in gdb should be relatively simple on top of the wide-char support
for C, cf. http://sourceware.org/ml/gdb-patches/2009-01/msg00533.html (I'm not
sure whether that is the latest patch, but it is in the CVS tree.)
Comment 1 Tom Tromey 2011-06-28 18:05:36 UTC
Testing a patch.
Comment 2 cvs-commit@gcc.gnu.org 2011-06-29 15:32:43 UTC
CVSROOT:	/cvs/src
Module name:	src
Changes by:	tromey@sourceware.org	2011-06-29 15:32:40

Modified files:
	gdb            : ChangeLog c-lang.c dwarf2read.c f-lang.c 
	                 f-typeprint.c f-valprint.c valprint.c 
	                 valprint.h 
	gdb/testsuite  : ChangeLog 
Added files:
	gdb/testsuite/gdb.fortran: charset.exp charset.f90 

Log message:
	gdb
	PR fortran/10036:
	* valprint.h (generic_emit_char, generic_printstr): Declare.
	* valprint.c (wchar_printable, append_string_as_wide)
	(print_wchar): Move from c-lang.c.
	(generic_emit_char): New function; mostly taken from c_emit_char.
	(generic_printstr): New function; mostly taken from c_printstr.
	* f-valprint.c (f_val_print) <TYPE_CODE_ARRAY>: Handle strings
	represented as arrays.
	<TYPE_CODE_CHAR>: Treat as TYPE_CODE_INT; recognize as character
	type.
	* f-typeprint.c (f_type_print_base) <TYPE_CODE_CHAR>: Treat
	identically to TYPE_CODE_INT.
	* f-lang.c (f_get_encoding): New function.
	(f_emit_char): Use generic_emit_char.
	(f_printchar): Replace comment.
	(f_printstr): Use generic_printstr.
	* dwarf2read.c (read_base_type) <DW_ATE_unsigned>: Handle Fortran
	"character" types specially.
	<DW_ATE_signed_char, DW_ATE_unsigned_char>: Make TYPE_CODE_CHAR
	for Fortran.
	* c-lang.c (wchar_printable, append_string_as_wide, print_wchar):
	Move to valprint.c
	(c_emit_char): Call generic_emit_char.
	(c_printstr): Call generic_printstr.
	gdb/testsuite
	* gdb.fortran/charset.exp: New file.
	* gdb.fortran/charset.f90: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.13123&r2=1.13124
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/c-lang.c.diff?cvsroot=src&r1=1.93&r2=1.94
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/dwarf2read.c.diff?cvsroot=src&r1=1.542&r2=1.543
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/f-lang.c.diff?cvsroot=src&r1=1.65&r2=1.66
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/f-typeprint.c.diff?cvsroot=src&r1=1.35&r2=1.36
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/f-valprint.c.diff?cvsroot=src&r1=1.66&r2=1.67
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/valprint.c.diff?cvsroot=src&r1=1.111&r2=1.112
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/valprint.h.diff?cvsroot=src&r1=1.36&r2=1.37
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2757&r2=1.2758
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.fortran/charset.exp.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.fortran/charset.f90.diff?cvsroot=src&r1=NONE&r2=1.1
Comment 3 Tom Tromey 2011-06-29 15:54:17 UTC
Fix checked in.