Re: [patch] const array types

[Ken Werner <ken at linux dot vnet dot ibm dot com>]

On Tuesday, October 05, 2010 8:25:05 pm Ulrich Weigand wrote:
> Ken Werner wrote:
> > +      return set_die_type (die, base_type, cu);;
> 
> Extra semicolon.

Fixed.

> Do we need the local_compiler_xfail_check for these tests?  If so, we'd
> need it before each of the tests; if not, we don't need it at all ...

Good point. Since const seems to be broken with gcc 2 -gstabs for primitives I 
guess this is also the case for arrays. Therefore I've put the 
local_compiler_xfail_check in front of each test.

Attached is a new version of the patch.
Ok to apply?

Thanks
Ken

ChangeLog:

2010-10-06  Ken Werner  <ken.werner@de.ibm.com>

	* gdb/dwarf2read.c (read_tag_const_type): Handle const arrays.

testsuite/ChangeLog:

2010-10-06  Ken Werner  <ken.werner@de.ibm.com>

	* gdb.base/constvars.c (logical, lugged, luck, lunar, lumen, lurk,
	lush, lynx) New constant.
	* gdb.base/constvars.exp: Test const array types.
	* gdb.dwarf2/dw2-strp.exp: Add const qualifier for ptype tests.


Index: gdb/dwarf2read.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2read.c,v
retrieving revision 1.468
diff -p -u -r1.468 dwarf2read.c
--- gdb/dwarf2read.c	5 Oct 2010 03:10:28 -0000	1.468
+++ gdb/dwarf2read.c	6 Oct 2010 11:49:33 -0000
@@ -7607,6 +7607,29 @@ read_tag_const_type (struct die_info *di
   if (cv_type)
     return cv_type;
 
+  /* In case the const qualifier is applied to an array type, the element type
+     is so qualified, not the array type (section 6.7.3 of C99).  */
+  if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
+    {
+      struct type *el_type, *inner_array;
+
+      base_type = copy_type (base_type);
+      inner_array = base_type;
+
+      while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
+	{
+	  TYPE_TARGET_TYPE (inner_array) =
+	    copy_type (TYPE_TARGET_TYPE (inner_array));
+	  inner_array = TYPE_TARGET_TYPE (inner_array);
+	}
+
+      el_type = TYPE_TARGET_TYPE (inner_array);
+      TYPE_TARGET_TYPE (inner_array) =
+	make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
+
+      return set_die_type (die, base_type, cu);
+    }
+
   cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
   return set_die_type (die, cv_type, cu);
 }
Index: gdb/testsuite/gdb.base/constvars.c
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.base/constvars.c,v
retrieving revision 1.4
diff -p -u -r1.4 constvars.c
--- gdb/testsuite/gdb.base/constvars.c	12 Nov 2009 19:35:26 -0000	1.4
+++ gdb/testsuite/gdb.base/constvars.c	6 Oct 2010 11:49:33 -0000
@@ -84,6 +84,16 @@ main (void)
   float          *const   lissome   = &leeway;
   double         *const   locust    = &legacy;
 
+  /* constant arrays */
+  const char logical[2] = {laconic, laconic};
+  const unsigned char lugged[2] = {laggard, laggard};
+  const short luck[2] = {lagoon, lagoon};
+  const unsigned short lunar[2] = {laity, laity};
+  const long lumen[2] = {lambent, lambent};
+  const unsigned long lurk[2] = {laminated, laminated};
+  const float lush[2] = {lampoon, lampoon};
+  const double lynx[2] = {languid, languid};
+
   /* volatile variables */
 
   volatile char vox = 'X';
Index: gdb/testsuite/gdb.base/constvars.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.base/constvars.exp,v
retrieving revision 1.23
diff -p -u -r1.23 constvars.exp
--- gdb/testsuite/gdb.base/constvars.exp	24 May 2010 22:03:59 -0000	1.23
+++ gdb/testsuite/gdb.base/constvars.exp	6 Oct 2010 11:49:33 -0000
@@ -253,6 +253,23 @@ proc do_constvar_tests {} {
     gdb_test "ptype locust" "type = double \\* const"
 
     local_compiler_xfail_check
+    gdb_test "ptype logical" "type = const char \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype lugged" "type = const unsigned char \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype luck" "type = const short( int)? \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype lunar" "type = const (unsigned short|short unsigned)( int)? \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype lumen" "type = const long( int)? \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype lurk" "type = const (unsigned long|long unsigned)( int)? \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype lush" "type = const float \\\[2\\\]"
+    local_compiler_xfail_check
+    gdb_test "ptype lynx" "type = const double \\\[2\\\]"
+
+    local_compiler_xfail_check
     local_compiler_xfail_check_2
     gdb_test "ptype crass" "type = struct crass \{\[\r\n\]+\[\ \t\]+char \\* const ptr;\[\r\n\]+\}"
     local_compiler_xfail_check
Index: gdb/testsuite/gdb.dwarf2/dw2-strp.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.dwarf2/dw2-strp.exp,v
retrieving revision 1.4
diff -p -u -r1.4 dw2-strp.exp
--- gdb/testsuite/gdb.dwarf2/dw2-strp.exp	1 Jan 2010 07:32:02 -0000	1.4
+++ gdb/testsuite/gdb.dwarf2/dw2-strp.exp	6 Oct 2010 11:49:33 -0000
@@ -49,7 +49,7 @@ gdb_reinitialize_dir $srcdir/$subdir
 gdb_load ${binfile}
 
 gdb_test "p a_string" " = \"hello world!\\\\n\""
-gdb_test "ptype a_string" "type = char \\\[14\\\]"
+gdb_test "ptype a_string" "type = const char \\\[14\\\]"
 
 gdb_test "p a_string2" " = \"hello world2\\\\n\""
-gdb_test "ptype a_string2" "type = char \\\[14\\\]"
+gdb_test "ptype a_string2" "type = const char \\\[14\\\]"