/* DWARF debugging format support for GDB.
- Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
+ Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*
#include "complaints.h"
#include <fcntl.h>
-#include <string.h>
+#include "gdb_string.h"
#ifndef NO_SYS_FILE
#include <sys/file.h>
#define CHILL_PRODUCER "GNU Chill "
#endif
+/* Provide a default mapping from a DWARF register number to a gdb REGNUM. */
+#ifndef DWARF_REG_TO_REGNUM
+#define DWARF_REG_TO_REGNUM(num) (num)
+#endif
+
/* Flags to target_to_host() that tell whether or not the data object is
expected to be signed. Used, for example, when fetching a signed
integer in the target environment which is used as a signed integer
unsigned long at_bit_size;
BLOCK * at_element_list;
unsigned long at_stmt_list;
- unsigned long at_low_pc;
- unsigned long at_high_pc;
+ CORE_ADDR at_low_pc;
+ CORE_ADDR at_high_pc;
unsigned long at_language;
unsigned long at_member;
unsigned long at_discr;
static int dbroff; /* Relative offset from start of .debug section */
static char *lnbase; /* Base pointer to line section */
static int isreg; /* Kludge to identify register variables */
+static int optimized_out; /* Kludge to identify optimized out variables */
/* Kludge to identify basereg references. Nonzero if we have an offset
relative to a basereg. */
static int offreg;
only used to pass one value (baseaddr) at the moment. */
static struct section_offsets *base_section_offsets;
-/* Each partial symbol table entry contains a pointer to private data for the
- read_symtab() function to use when expanding a partial symbol table entry
- to a full symbol table entry. For DWARF debugging info, this data is
- contained in the following structure and macros are provided for easy
- access to the members given a pointer to a partial symbol table entry.
-
- dbfoff Always the absolute file offset to the start of the ".debug"
- section for the file containing the DIE's being accessed.
-
- dbroff Relative offset from the start of the ".debug" access to the
- first DIE to be accessed. When building the partial symbol
- table, this value will be zero since we are accessing the
- entire ".debug" section. When expanding a partial symbol
- table entry, this value will be the offset to the first
- DIE for the compilation unit containing the symbol that
- triggers the expansion.
-
- dblength The size of the chunk of DIE's being examined, in bytes.
-
- lnfoff The absolute file offset to the line table fragment. Ignored
- when building partial symbol tables, but used when expanding
- them, and contains the absolute file offset to the fragment
- of the ".line" section containing the line numbers for the
- current compilation unit.
- */
+/* We put a pointer to this structure in the read_symtab_private field
+ of the psymtab. */
struct dwfinfo {
- file_ptr dbfoff; /* Absolute file offset to start of .debug section */
- int dbroff; /* Relative offset from start of .debug section */
- int dblength; /* Size of the chunk of DIE's being examined */
- file_ptr lnfoff; /* Absolute file offset to line table fragment */
+ /* Always the absolute file offset to the start of the ".debug"
+ section for the file containing the DIE's being accessed. */
+ file_ptr dbfoff;
+ /* Relative offset from the start of the ".debug" section to the
+ first DIE to be accessed. When building the partial symbol
+ table, this value will be zero since we are accessing the
+ entire ".debug" section. When expanding a partial symbol
+ table entry, this value will be the offset to the first
+ DIE for the compilation unit containing the symbol that
+ triggers the expansion. */
+ int dbroff;
+ /* The size of the chunk of DIE's being examined, in bytes. */
+ int dblength;
+ /* The absolute file offset to the line table fragment. Ignored
+ when building partial symbol tables, but used when expanding
+ them, and contains the absolute file offset to the fragment
+ of the ".line" section containing the line numbers for the
+ current compilation unit. */
+ file_ptr lnfoff;
};
#define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
static int
attribute_size PARAMS ((unsigned int));
-static unsigned long
+static CORE_ADDR
target_to_host PARAMS ((char *, int, int, struct objfile *));
static void
static void
add_partial_symbol PARAMS ((struct dieinfo *, struct objfile *));
-static void
-init_psymbol_list PARAMS ((struct objfile *, int));
-
static void
basicdieinfo PARAMS ((struct dieinfo *, char *, struct objfile *));
/* We have an existing partially constructed type, so bash it
into the correct type. */
TYPE_TARGET_TYPE (ftype) = type;
- TYPE_FUNCTION_TYPE (type) = ftype;
TYPE_LENGTH (ftype) = 1;
TYPE_CODE (ftype) = TYPE_CODE_FUNC;
}
Given pointer to a string of bytes that define a location, compute
the location and return the value.
+ A location description containing no atoms indicates that the
+ object is optimized out. The global optimized_out flag is set for
+ those, the return value is meaningless.
When computing values involving the current value of the frame pointer,
the value zero is used, which results in a value relative to the frame
stack[stacki] = 0;
isreg = 0;
offreg = 0;
+ optimized_out = 1;
loc_value_size = TARGET_FT_LONG_SIZE (current_objfile);
while (loc < end)
{
+ optimized_out = 0;
loc_atom_code = target_to_host (loc, SIZEOF_LOC_ATOM_CODE, GET_UNSIGNED,
current_objfile);
loc += SIZEOF_LOC_ATOM_CODE;
break;
case OP_REG:
/* push register (number) */
- stack[++stacki] = target_to_host (loc, loc_value_size,
- GET_UNSIGNED, current_objfile);
+ stack[++stacki]
+ = DWARF_REG_TO_REGNUM (target_to_host (loc, loc_value_size,
+ GET_UNSIGNED,
+ current_objfile));
loc += loc_value_size;
isreg = 1;
break;
/*
-LOCAL FUNCTION
-
- init_psymbol_list -- initialize storage for partial symbols
-
-SYNOPSIS
-
- static void init_psymbol_list (struct objfile *objfile, int total_symbols)
-
-DESCRIPTION
-
- Initializes storage for all of the partial symbols that will be
- created by dwarf_build_psymtabs and subsidiaries.
- */
-
-static void
-init_psymbol_list (objfile, total_symbols)
- struct objfile *objfile;
- int total_symbols;
-{
- /* Free any previously allocated psymbol lists. */
-
- if (objfile -> global_psymbols.list)
- {
- mfree (objfile -> md, (PTR)objfile -> global_psymbols.list);
- }
- if (objfile -> static_psymbols.list)
- {
- mfree (objfile -> md, (PTR)objfile -> static_psymbols.list);
- }
-
- /* Current best guess is that there are approximately a twentieth
- of the total symbols (in a debugging file) are global or static
- oriented symbols */
-
- objfile -> global_psymbols.size = total_symbols / 10;
- objfile -> static_psymbols.size = total_symbols / 10;
- objfile -> global_psymbols.next =
- objfile -> global_psymbols.list = (struct partial_symbol *)
- xmmalloc (objfile -> md, objfile -> global_psymbols.size
- * sizeof (struct partial_symbol));
- objfile -> static_psymbols.next =
- objfile -> static_psymbols.list = (struct partial_symbol *)
- xmmalloc (objfile -> md, objfile -> static_psymbols.size
- * sizeof (struct partial_symbol));
-}
-
-/*
-
LOCAL FUNCTION
add_enum_psymbol -- add enumeration members to partial symbol table
{
SYMBOL_VALUE (sym) = locval (dip -> at_location);
add_symbol_to_list (sym, list_in_scope);
- if (isreg)
+ if (optimized_out)
+ {
+ SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
+ }
+ else if (isreg)
{
SYMBOL_CLASS (sym) = LOC_REGISTER;
}
use it as signed data, then we need to explicitly sign extend the
result until the bfd library is able to do this for us.
+ FIXME: Would a 32 bit target ever need an 8 byte result?
+
*/
-static unsigned long
+static CORE_ADDR
target_to_host (from, nbytes, signextend, objfile)
char *from;
int nbytes;
int signextend; /* FIXME: Unused */
struct objfile *objfile;
{
- unsigned long rtnval;
+ CORE_ADDR rtnval;
switch (nbytes)
{
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