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This patch allows the gdb DWARF reader to handle variables located in Fortran common blocks. This fixes 20 unexpected failures in the gdb.fortran testsuite with host, target and build triplet x86_64-apple-darwin13.4.0 with gfortran 4.9.2.
gdb/ChangeLog:
2015-03-30 George Helffrich <ghfbsd@gmail.com>
* dwarf2read.c (read_common_block): Relocate symbols in Fortran common
blocks properly.
(read_new_symbol_full): Don't discard zero-offset symbols in Fortran
common blocks.
(_initialize_dwarf2_read): Add debug diagnostic print for common
symbols.
* psymtab.c (print_partial_symbols): Recognize and print
COMMON_BLOCK_DOMAIN.
* symmisc.c (print_symbol): Recognize and dump LOC_COMMON_BLOCK.
---
--- dwarf2read.c.orig 2015-02-21 02:11:44.000000000 +0900
+++ dwarf2read.c 2016-03-29 19:43:48.000000000 +0900
@@ -84,6 +84,9 @@ static unsigned int dwarf2_read_debug =
/* When non-zero, dump DIEs after they are read in. */
static unsigned int dwarf2_die_debug = 0;
+/* When non-zero, report definition of common block variables. */
+static unsigned int dwarf2_common_debug = 0;
+
/* When non-zero, cross-check physname against demangler. */
static int check_physname = 0;
@@ -13877,6 +13880,57 @@ static void
read_common_block (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
+ CORE_ADDR baseaddr;
+ struct program_space *psp;
+ struct minimal_symbol *msym = NULL;
+ struct objfile *objfile = cu->objfile;
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
+ const char *name;
+
+ attr = dwarf2_attr (die, DW_AT_name, cu);
+ name = dwarf2_compute_name (NULL, die, cu, 1);
+ if (dwarf2_common_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "Read common blk %s (%s)\n",
+ DW_STRING(attr), name);
+ }
+ ALL_PSPACES (psp)
+ ALL_PSPACE_OBJFILES (psp, objfile)
+ if (objfile->flags & OBJF_MAINLINE) goto found;
+found:
+ if (objfile->flags & OBJF_MAINLINE)
+ ALL_OBJFILE_MSYMBOLS (objfile, msym)
+ {
+ struct obj_section *section = MSYMBOL_OBJ_SECTION (objfile, msym);
+
+ if (0 == strcmp(MSYMBOL_LINKAGE_NAME (msym), name))
+ {
+ if (dwarf2_common_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, " Found %s at ", name);
+ fputs_filtered (paddress (gdbarch,
+ MSYMBOL_VALUE_ADDRESS (objfile, msym)),
+ gdb_stdlog);
+ }
+ if (section && dwarf2_common_debug)
+ {
+ if (section->the_bfd_section != NULL)
+ fprintf_filtered (gdb_stdlog, " section %s",
+ bfd_section_name (objfile->obfd,
+ section->the_bfd_section));
+ else
+ fprintf_filtered (gdb_stdlog, " spurious section %ld",
+ (long) (section - objfile->sections));
+ }
+ if (dwarf2_common_debug)
+ fprintf_unfiltered (gdb_stdlog, "\n");
+
+ /* Found base of common, now use it to relocate symbols in it */
+ baseaddr = MSYMBOL_VALUE_ADDRESS (objfile, msym);
+ break;
+ }
+ }
attr = dwarf2_attr (die, DW_AT_location, cu);
if (attr)
@@ -13958,6 +14012,31 @@ read_common_block (struct die_info *die,
else
dwarf2_complex_location_expr_complaint ();
}
+
+ if (dwarf2_common_debug)
+ {
+ struct attribute *name = dwarf2_attr (child_die, DW_AT_name, cu);
+ fprintf_unfiltered (gdb_stdlog,
+ " Define common blk var %s at ",
+ DW_STRING(name));
+ fputs_filtered (paddress (gdbarch,
+ SYMBOL_VALUE_ADDRESS (sym)),
+ gdb_stdlog);
+ fputs_filtered (" -> ", gdb_stdlog);
+ if (msym)
+ fputs_filtered (paddress (gdbarch,
+ SYMBOL_VALUE_ADDRESS (sym)
+ + baseaddr),
+ gdb_stdlog);
+ else
+ fputs_filtered ("(unknown)", gdb_stdlog);
+ fputs_filtered ("\n", gdb_stdlog);
+ }
+
+ /* Relocate symbol in common block */
+ if (msym)
+ SYMBOL_VALUE_ADDRESS (sym) += baseaddr;
+
}
}
@@ -18165,6 +18244,8 @@ new_symbol_full (struct die_info *die, s
attr = dwarf2_attr (die, DW_AT_location, cu);
if (attr)
{
+ unsigned int fortran_common_symbol = 0;
+
var_decode_location (attr, sym, cu);
attr2 = dwarf2_attr (die, DW_AT_external, cu);
@@ -18172,16 +18253,23 @@ new_symbol_full (struct die_info *die, s
scope by DW_TAG_common_block. */
if (cu->language == language_fortran && die->parent
&& die->parent->tag == DW_TAG_common_block)
- attr2 = NULL;
+ {
+ attr2 = NULL;
+ fortran_common_symbol = 1;
+ }
if (SYMBOL_CLASS (sym) == LOC_STATIC
&& SYMBOL_VALUE_ADDRESS (sym) == 0
+ && !fortran_common_symbol
&& !dwarf2_per_objfile->has_section_at_zero)
{
/* When a static variable is eliminated by the linker,
the corresponding debug information is not stripped
out, but the variable address is set to null;
- do not add such variables into symbol table. */
+ do not add such variables into symbol table.
+
+ An exception is Fortran, for which the first symbol
+ in a common block will have address/offset 0. */
}
else if (attr2 && (DW_UNSND (attr2) != 0))
{
@@ -23195,6 +23283,16 @@ The value is the maximum depth to print.
NULL,
&setdebuglist, &showdebuglist);
+ add_setshow_zuinteger_cmd ("dwarf2-common",
+ no_class, &dwarf2_common_debug, _("\
+Set debugging of dwarf2 common block handling."), _("\
+Show debugging of dwarf2 common block handling."), _("\
+When enabled (non-zero), common block variables are printed as they are\n\
+are relocated to their position in the common section."),
+ NULL,
+ NULL,
+ &setdebuglist, &showdebuglist);
+
add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
Set cross-checking of \"physname\" code against demangler."), _("\
Show cross-checking of \"physname\" code against demangler."), _("\
--- symmisc.c.orig 2015-02-21 02:11:44.000000000 +0900
+++ symmisc.c 2016-03-27 18:46:17.000000000 +0900
@@ -626,6 +626,15 @@ print_symbol (void *args)
fprintf_filtered (outfile, "optimized out");
break;
+ case LOC_COMMON_BLOCK:
+ fprintf_filtered (outfile, "common block storage");
+
+ if (section)
+ fprintf_filtered (outfile, " section %s",
+ bfd_section_name (section->the_bfd_section->owner,
+ section->the_bfd_section));
+ break;
+
default:
fprintf_filtered (outfile, "botched symbol class %x",
SYMBOL_CLASS (symbol));
--- psymtab.c.orig 2015-02-21 02:11:44.000000000 +0900
+++ psymtab.c 2016-03-27 18:13:25.000000000 +0900
@@ -915,6 +915,9 @@ print_partial_symbols (struct gdbarch *g
case LABEL_DOMAIN:
fputs_filtered ("label domain, ", outfile);
break;
+ case COMMON_BLOCK_DOMAIN:
+ fputs_filtered ("common block domain, ", outfile);
+ break;
default:
fputs_filtered ("<invalid domain>, ", outfile);
break;
---
G Helffrich
ghfbsd@gmail.com
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