3100 lines
83 KiB
C
3100 lines
83 KiB
C
/* DWARF debugging format support for GDB.
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Copyright (C) 1991 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support, portions based on dbxread.c,
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mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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FIXME: Figure out how to get the frame pointer register number in the
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execution environment of the target. Remove R_FP kludge
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FIXME: Add generation of dependencies list to partial symtab code.
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FIXME: Currently we ignore host/target byte ordering and integer size
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differences. Should remap data from external form to an internal form
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before trying to use it.
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FIXME: Resolve minor differences between what information we put in the
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partial symbol table and what dbxread puts in. For example, we don't yet
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put enum constants there. And dbxread seems to invent a lot of typedefs
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we never see. Use the new printpsym command to see the partial symbol table
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contents.
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FIXME: Figure out a better way to tell gdb about the name of the function
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contain the user's entry point (I.E. main())
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FIXME: The current DWARF specification has a very strong bias towards
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machines with 32-bit integers, as it assumes that many attributes of the
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program (such as an address) will fit in such an integer. There are many
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references in the spec to things that are 2, 4, or 8 bytes long. Given that
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we will probably run into problems on machines where some of these assumptions
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are invalid (64-bit ints for example), we don't bother at this time to try to
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make this code more flexible and just use shorts, ints, and longs (and their
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sizes) where it seems appropriate. I.E. we use a short int to hold DWARF
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tags, and assume that the tag size in the file is the same as sizeof(short).
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FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
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other things to work on, if you get bored. :-)
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*/
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#include <stdio.h>
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include <fcntl.h>
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#include "defs.h"
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#include "bfd.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "elf/dwarf.h"
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#include "ansidecl.h"
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#include "buildsym.h"
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#ifdef MAINTENANCE /* Define to 1 to compile in some maintenance stuff */
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#define SQUAWK(stuff) dwarfwarn stuff
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#else
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#define SQUAWK(stuff)
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#endif
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#ifndef R_FP /* FIXME */
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#define R_FP 14 /* Kludge to get frame pointer register number */
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#endif
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typedef unsigned int DIEREF; /* Reference to a DIE */
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#ifndef GCC_PRODUCER
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#define GCC_PRODUCER "GNU C "
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#endif
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#define STREQ(a,b) (strcmp(a,b)==0)
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#define STREQN(a,b,n) (strncmp(a,b,n)==0)
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/* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
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FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
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However, the Issue 2 DWARF specification from AT&T defines it as
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a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
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For backwards compatibility with the AT&T compiler produced executables
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we define AT_short_element_list for this variant. */
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#define AT_short_element_list (0x00f0|FORM_BLOCK2)
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/* External variables referenced. */
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extern CORE_ADDR startup_file_start; /* From blockframe.c */
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extern CORE_ADDR startup_file_end; /* From blockframe.c */
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extern CORE_ADDR entry_scope_lowpc; /* From blockframe.c */
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extern CORE_ADDR entry_scope_highpc; /* From blockframc.c */
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extern CORE_ADDR main_scope_lowpc; /* From blockframe.c */
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extern CORE_ADDR main_scope_highpc; /* From blockframc.c */
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extern int info_verbose; /* From main.c; nonzero => verbose */
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/* The DWARF debugging information consists of two major pieces,
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one is a block of DWARF Information Entries (DIE's) and the other
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is a line number table. The "struct dieinfo" structure contains
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the information for a single DIE, the one currently being processed.
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In order to make it easier to randomly access the attribute fields
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of the current DIE, which are specifically unordered within the DIE
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each DIE is scanned and an instance of the "struct dieinfo"
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structure is initialized.
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Initialization is done in two levels. The first, done by basicdieinfo(),
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just initializes those fields that are vital to deciding whether or not
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to use this DIE, how to skip past it, etc. The second, done by the
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function completedieinfo(), fills in the rest of the information.
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Attributes which have block forms are not interpreted at the time
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the DIE is scanned, instead we just save pointers to the start
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of their value fields.
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Some fields have a flag <name>_p that is set when the value of the
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field is valid (I.E. we found a matching attribute in the DIE). Since
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we may want to test for the presence of some attributes in the DIE,
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such as AT_low_pc, without restricting the values of the field,
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we need someway to note that we found such an attribute.
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*/
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typedef char BLOCK;
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struct dieinfo {
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char * die; /* Pointer to the raw DIE data */
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long dielength; /* Length of the raw DIE data */
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DIEREF dieref; /* Offset of this DIE */
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short dietag; /* Tag for this DIE */
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long at_padding;
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long at_sibling;
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BLOCK * at_location;
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char * at_name;
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unsigned short at_fund_type;
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BLOCK * at_mod_fund_type;
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long at_user_def_type;
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BLOCK * at_mod_u_d_type;
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short at_ordering;
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BLOCK * at_subscr_data;
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long at_byte_size;
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short at_bit_offset;
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long at_bit_size;
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BLOCK * at_element_list;
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long at_stmt_list;
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long at_low_pc;
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long at_high_pc;
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long at_language;
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long at_member;
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long at_discr;
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BLOCK * at_discr_value;
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short at_visibility;
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long at_import;
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BLOCK * at_string_length;
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char * at_comp_dir;
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char * at_producer;
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long at_frame_base;
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long at_start_scope;
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long at_stride_size;
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long at_src_info;
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short at_prototyped;
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unsigned int has_at_low_pc:1;
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unsigned int has_at_stmt_list:1;
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unsigned int short_element_list:1;
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};
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static int diecount; /* Approximate count of dies for compilation unit */
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static struct dieinfo *curdie; /* For warnings and such */
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static char *dbbase; /* Base pointer to dwarf info */
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static int dbroff; /* Relative offset from start of .debug section */
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static char *lnbase; /* Base pointer to line section */
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static int isreg; /* Kludge to identify register variables */
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static int offreg; /* Kludge to identify basereg references */
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static CORE_ADDR baseaddr; /* Add to each symbol value */
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/* Each partial symbol table entry contains a pointer to private data for the
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read_symtab() function to use when expanding a partial symbol table entry
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to a full symbol table entry. For DWARF debugging info, this data is
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contained in the following structure and macros are provided for easy
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access to the members given a pointer to a partial symbol table entry.
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dbfoff Always the absolute file offset to the start of the ".debug"
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section for the file containing the DIE's being accessed.
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dbroff Relative offset from the start of the ".debug" access to the
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first DIE to be accessed. When building the partial symbol
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table, this value will be zero since we are accessing the
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entire ".debug" section. When expanding a partial symbol
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table entry, this value will be the offset to the first
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DIE for the compilation unit containing the symbol that
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triggers the expansion.
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dblength The size of the chunk of DIE's being examined, in bytes.
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lnfoff The absolute file offset to the line table fragment. Ignored
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when building partial symbol tables, but used when expanding
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them, and contains the absolute file offset to the fragment
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of the ".line" section containing the line numbers for the
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current compilation unit.
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*/
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struct dwfinfo {
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int dbfoff; /* Absolute file offset to start of .debug section */
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int dbroff; /* Relative offset from start of .debug section */
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int dblength; /* Size of the chunk of DIE's being examined */
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int lnfoff; /* Absolute file offset to line table fragment */
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};
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#define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
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#define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
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#define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
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#define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
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/* The generic symbol table building routines have separate lists for
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file scope symbols and all all other scopes (local scopes). So
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we need to select the right one to pass to add_symbol_to_list().
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We do it by keeping a pointer to the correct list in list_in_scope.
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FIXME: The original dwarf code just treated the file scope as the first
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local scope, and all other local scopes as nested local scopes, and worked
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fine. Check to see if we really need to distinguish these in buildsym.c */
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struct pending **list_in_scope = &file_symbols;
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/* DIES which have user defined types or modified user defined types refer to
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other DIES for the type information. Thus we need to associate the offset
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of a DIE for a user defined type with a pointer to the type information.
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Originally this was done using a simple but expensive algorithm, with an
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array of unsorted structures, each containing an offset/type-pointer pair.
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This array was scanned linearly each time a lookup was done. The result
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was that gdb was spending over half it's startup time munging through this
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array of pointers looking for a structure that had the right offset member.
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The second attempt used the same array of structures, but the array was
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sorted using qsort each time a new offset/type was recorded, and a binary
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search was used to find the type pointer for a given DIE offset. This was
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even slower, due to the overhead of sorting the array each time a new
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offset/type pair was entered.
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The third attempt uses a fixed size array of type pointers, indexed by a
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value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
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we can divide any DIE offset by 4 to obtain a unique index into this fixed
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size array. Since each element is a 4 byte pointer, it takes exactly as
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much memory to hold this array as to hold the DWARF info for a given
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compilation unit. But it gets freed as soon as we are done with it. */
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static struct type **utypes; /* Pointer to array of user type pointers */
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static int numutypes; /* Max number of user type pointers */
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/* Forward declarations of static functions so we don't have to worry
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about ordering within this file. The EXFUN macro may be slightly
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misleading. Should probably be called DCLFUN instead, or something
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more intuitive, since it can be used for both static and external
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definitions. */
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static void
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EXFUN (dwarfwarn, (char *fmt DOTS));
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static void
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EXFUN (scan_partial_symbols, (char *thisdie AND char *enddie));
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static void
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EXFUN (scan_compilation_units,
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(char *filename AND char *thisdie AND char *enddie
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AND unsigned int dbfoff AND unsigned int lnoffset
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AND struct objfile *objfile));
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static struct partial_symtab *
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EXFUN(dwarf_start_psymtab, (struct objfile *objfile AND CORE_ADDR addr
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AND char *filename AND CORE_ADDR textlow
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AND CORE_ADDR texthigh AND int dbfoff
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AND int curoff AND int culength AND int lnfoff
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AND struct partial_symbol *global_syms
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AND struct partial_symbol *static_syms));
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static void
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EXFUN(add_partial_symbol, (struct dieinfo *dip));
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static void
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EXFUN(init_psymbol_list, (int total_symbols));
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static void
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EXFUN(basicdieinfo, (struct dieinfo *dip AND char *diep));
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static void
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EXFUN(completedieinfo, (struct dieinfo *dip));
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static void
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EXFUN(dwarf_psymtab_to_symtab, (struct partial_symtab *pst));
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static void
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EXFUN(psymtab_to_symtab_1, (struct partial_symtab *pst));
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static struct symtab *
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EXFUN(read_ofile_symtab, (struct partial_symtab *pst));
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static void
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EXFUN(process_dies,
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(char *thisdie AND char *enddie AND struct objfile *objfile));
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static void
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EXFUN(read_structure_scope,
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(struct dieinfo *dip AND char *thisdie AND char *enddie AND
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struct objfile *objfile));
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static struct type *
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EXFUN(decode_array_element_type, (char *scan AND char *end));
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static struct type *
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EXFUN(decode_subscr_data, (char *scan AND char *end));
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static void
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EXFUN(dwarf_read_array_type, (struct dieinfo *dip));
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static void
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EXFUN(read_subroutine_type,
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(struct dieinfo *dip AND char *thisdie AND char *enddie));
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static void
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EXFUN(read_enumeration,
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(struct dieinfo *dip AND char *thisdie AND char *enddie));
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static struct type *
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EXFUN(struct_type,
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(struct dieinfo *dip AND char *thisdie AND char *enddie AND
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struct objfile *objfile));
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static struct type *
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EXFUN(enum_type, (struct dieinfo *dip));
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static void
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EXFUN(decode_line_numbers, (char *linetable));
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static struct type *
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EXFUN(decode_die_type, (struct dieinfo *dip));
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static struct type *
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EXFUN(decode_mod_fund_type, (char *typedata));
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static struct type *
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EXFUN(decode_mod_u_d_type, (char *typedata));
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static struct type *
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EXFUN(decode_modified_type,
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(unsigned char *modifiers AND unsigned short modcount AND int mtype));
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static struct type *
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EXFUN(decode_fund_type, (unsigned short fundtype));
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static char *
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EXFUN(create_name, (char *name AND struct obstack *obstackp));
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static struct type *
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EXFUN(lookup_utype, (DIEREF dieref));
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static struct type *
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EXFUN(alloc_utype, (DIEREF dieref AND struct type *usetype));
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static struct symbol *
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EXFUN(new_symbol, (struct dieinfo *dip));
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static int
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EXFUN(locval, (char *loc));
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static void
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EXFUN(record_misc_function, (char *name AND CORE_ADDR address AND
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enum misc_function_type));
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static int
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EXFUN(compare_psymbols,
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(struct partial_symbol *s1 AND struct partial_symbol *s2));
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/*
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GLOBAL FUNCTION
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dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
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SYNOPSIS
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void dwarf_build_psymtabs (int desc, char *filename, CORE_ADDR addr,
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int mainline, unsigned int dbfoff, unsigned int dbsize,
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unsigned int lnoffset, unsigned int lnsize,
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struct objfile *objfile)
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DESCRIPTION
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This function is called upon to build partial symtabs from files
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containing DIE's (Dwarf Information Entries) and DWARF line numbers.
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It is passed a file descriptor for an open file containing the DIES
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and line number information, the corresponding filename for that
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file, a base address for relocating the symbols, a flag indicating
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whether or not this debugging information is from a "main symbol
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table" rather than a shared library or dynamically linked file,
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and file offset/size pairs for the DIE information and line number
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information.
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RETURNS
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No return value.
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*/
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void
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DEFUN(dwarf_build_psymtabs,
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(desc, filename, addr, mainline, dbfoff, dbsize, lnoffset, lnsize,
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objfile),
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int desc AND
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char *filename AND
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CORE_ADDR addr AND
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int mainline AND
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unsigned int dbfoff AND
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unsigned int dbsize AND
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unsigned int lnoffset AND
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unsigned int lnsize AND
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struct objfile *objfile)
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{
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struct cleanup *back_to;
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dbbase = xmalloc (dbsize);
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dbroff = 0;
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if ((lseek (desc, dbfoff, 0) != dbfoff) ||
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(read (desc, dbbase, dbsize) != dbsize))
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{
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free (dbbase);
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error ("can't read DWARF data from '%s'", filename);
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}
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back_to = make_cleanup (free, dbbase);
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/* If we are reinitializing, or if we have never loaded syms yet, init.
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Since we have no idea how many DIES we are looking at, we just guess
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some arbitrary value. */
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if (mainline || global_psymbols.size == 0 || static_psymbols.size == 0)
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{
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init_psymbol_list (1024);
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}
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/* From this point on, we don't need to pass mainline around, so zap
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baseaddr to zero if we don't need relocation. */
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if (mainline)
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{
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baseaddr = 0;
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}
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else
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{
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baseaddr = addr;
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}
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/* Follow the compilation unit sibling chain, building a partial symbol
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table entry for each one. Save enough information about each compilation
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unit to locate the full DWARF information later. */
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scan_compilation_units (filename, dbbase, dbbase + dbsize,
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dbfoff, lnoffset, objfile);
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do_cleanups (back_to);
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}
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/*
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LOCAL FUNCTION
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record_misc_function -- add entry to miscellaneous function vector
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SYNOPSIS
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static void record_misc_function (char *name, CORE_ADDR address,
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enum misc_function_type mf_type)
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DESCRIPTION
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Given a pointer to the name of a symbol that should be added to the
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miscellaneous function vector, and the address associated with that
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symbol, records this information for later use in building the
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miscellaneous function vector.
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*/
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static void
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DEFUN(record_misc_function, (name, address, mf_type),
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char *name AND CORE_ADDR address AND enum misc_function_type mf_type)
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{
|
|
prim_record_misc_function (obsavestring (name, strlen (name)), address,
|
|
mf_type);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
dwarfwarn -- issue a DWARF related warning
|
|
|
|
DESCRIPTION
|
|
|
|
Issue warnings about DWARF related things that aren't serious enough
|
|
to warrant aborting with an error, but should not be ignored either.
|
|
This includes things like detectable corruption in DIE's, missing
|
|
DIE's, unimplemented features, etc.
|
|
|
|
In general, running across tags or attributes that we don't recognize
|
|
is not considered to be a problem and we should not issue warnings
|
|
about such.
|
|
|
|
NOTES
|
|
|
|
We mostly follow the example of the error() routine, but without
|
|
returning to command level. It is arguable about whether warnings
|
|
should be issued at all, and if so, where they should go (stdout or
|
|
stderr).
|
|
|
|
We assume that curdie is valid and contains at least the basic
|
|
information for the DIE where the problem was noticed.
|
|
*/
|
|
|
|
#ifdef __STDC__
|
|
|
|
static void
|
|
DEFUN(dwarfwarn, (fmt), char *fmt DOTS)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start (ap, fmt);
|
|
warning_setup ();
|
|
fprintf (stderr, "DWARF warning (ref 0x%x): ", curdie -> dieref);
|
|
if (curdie -> at_name)
|
|
{
|
|
fprintf (stderr, "'%s': ", curdie -> at_name);
|
|
}
|
|
vfprintf (stderr, fmt, ap);
|
|
fprintf (stderr, "\n");
|
|
fflush (stderr);
|
|
va_end (ap);
|
|
}
|
|
|
|
#else
|
|
|
|
static void
|
|
dwarfwarn (va_alist)
|
|
va_dcl
|
|
{
|
|
va_list ap;
|
|
char *fmt;
|
|
|
|
va_start (ap);
|
|
fmt = va_arg (ap, char *);
|
|
warning_setup ();
|
|
fprintf (stderr, "DWARF warning (ref 0x%x): ", curdie -> dieref);
|
|
if (curdie -> at_name)
|
|
{
|
|
fprintf (stderr, "'%s': ", curdie -> at_name);
|
|
}
|
|
vfprintf (stderr, fmt, ap);
|
|
fprintf (stderr, "\n");
|
|
fflush (stderr);
|
|
va_end (ap);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
compare_psymbols -- compare two partial symbols by name
|
|
|
|
DESCRIPTION
|
|
|
|
Given pointer to two partial symbol table entries, compare
|
|
them by name and return -N, 0, or +N (ala strcmp). Typically
|
|
used by sorting routines like qsort().
|
|
|
|
NOTES
|
|
|
|
This is a copy from dbxread.c. It should be moved to a generic
|
|
gdb file and made available for all psymtab builders (FIXME).
|
|
|
|
Does direct compare of first two characters before punting
|
|
and passing to strcmp for longer compares. Note that the
|
|
original version had a bug whereby two null strings or two
|
|
identically named one character strings would return the
|
|
comparison of memory following the null byte.
|
|
|
|
*/
|
|
|
|
static int
|
|
DEFUN(compare_psymbols, (s1, s2),
|
|
struct partial_symbol *s1 AND
|
|
struct partial_symbol *s2)
|
|
{
|
|
register char *st1 = SYMBOL_NAME (s1);
|
|
register char *st2 = SYMBOL_NAME (s2);
|
|
|
|
if ((st1[0] - st2[0]) || !st1[0])
|
|
{
|
|
return (st1[0] - st2[0]);
|
|
}
|
|
else if ((st1[1] - st2[1]) || !st1[1])
|
|
{
|
|
return (st1[1] - st2[1]);
|
|
}
|
|
else
|
|
{
|
|
return (strcmp (st1 + 2, st2 + 2));
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_lexical_block_scope -- process all dies in a lexical block
|
|
|
|
SYNOPSIS
|
|
|
|
static void read_lexical_block_scope (struct dieinfo *dip,
|
|
char *thisdie, char *enddie)
|
|
|
|
DESCRIPTION
|
|
|
|
Process all the DIES contained within a lexical block scope.
|
|
Start a new scope, process the dies, and then close the scope.
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(read_lexical_block_scope, (dip, thisdie, enddie, objfile),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie AND
|
|
struct objfile *objfile)
|
|
{
|
|
register struct context_stack *new;
|
|
|
|
(void) push_context (0, dip -> at_low_pc);
|
|
process_dies (thisdie + dip -> dielength, enddie, objfile);
|
|
new = pop_context ();
|
|
if (local_symbols != NULL)
|
|
{
|
|
finish_block (0, &local_symbols, new -> old_blocks, new -> start_addr,
|
|
dip -> at_high_pc);
|
|
}
|
|
local_symbols = new -> locals;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
lookup_utype -- look up a user defined type from die reference
|
|
|
|
SYNOPSIS
|
|
|
|
static type *lookup_utype (DIEREF dieref)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a DIE reference, lookup the user defined type associated with
|
|
that DIE, if it has been registered already. If not registered, then
|
|
return NULL. Alloc_utype() can be called to register an empty
|
|
type for this reference, which will be filled in later when the
|
|
actual referenced DIE is processed.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(lookup_utype, (dieref), DIEREF dieref)
|
|
{
|
|
struct type *type = NULL;
|
|
int utypeidx;
|
|
|
|
utypeidx = (dieref - dbroff) / 4;
|
|
if ((utypeidx < 0) || (utypeidx >= numutypes))
|
|
{
|
|
dwarfwarn ("reference to DIE (0x%x) outside compilation unit", dieref);
|
|
}
|
|
else
|
|
{
|
|
type = *(utypes + utypeidx);
|
|
}
|
|
return (type);
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
alloc_utype -- add a user defined type for die reference
|
|
|
|
SYNOPSIS
|
|
|
|
static type *alloc_utype (DIEREF dieref, struct type *utypep)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a die reference DIEREF, and a possible pointer to a user
|
|
defined type UTYPEP, register that this reference has a user
|
|
defined type and either use the specified type in UTYPEP or
|
|
make a new empty type that will be filled in later.
|
|
|
|
We should only be called after calling lookup_utype() to verify that
|
|
there is not currently a type registered for DIEREF.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(alloc_utype, (dieref, utypep),
|
|
DIEREF dieref AND
|
|
struct type *utypep)
|
|
{
|
|
struct type **typep;
|
|
int utypeidx;
|
|
|
|
utypeidx = (dieref - dbroff) / 4;
|
|
typep = utypes + utypeidx;
|
|
if ((utypeidx < 0) || (utypeidx >= numutypes))
|
|
{
|
|
utypep = builtin_type_int;
|
|
dwarfwarn ("reference to DIE (0x%x) outside compilation unit", dieref);
|
|
}
|
|
else if (*typep != NULL)
|
|
{
|
|
utypep = *typep;
|
|
SQUAWK (("internal error: dup user type allocation"));
|
|
}
|
|
else
|
|
{
|
|
if (utypep == NULL)
|
|
{
|
|
utypep = (struct type *)
|
|
obstack_alloc (symbol_obstack, sizeof (struct type));
|
|
(void) memset (utypep, 0, sizeof (struct type));
|
|
}
|
|
*typep = utypep;
|
|
}
|
|
return (utypep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_die_type -- return a type for a specified die
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *decode_die_type (struct dieinfo *dip)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to a die information structure DIP, decode the
|
|
type of the die and return a pointer to the decoded type. All
|
|
dies without specific types default to type int.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_die_type, (dip), struct dieinfo *dip)
|
|
{
|
|
struct type *type = NULL;
|
|
|
|
if (dip -> at_fund_type != 0)
|
|
{
|
|
type = decode_fund_type (dip -> at_fund_type);
|
|
}
|
|
else if (dip -> at_mod_fund_type != NULL)
|
|
{
|
|
type = decode_mod_fund_type (dip -> at_mod_fund_type);
|
|
}
|
|
else if (dip -> at_user_def_type)
|
|
{
|
|
if ((type = lookup_utype (dip -> at_user_def_type)) == NULL)
|
|
{
|
|
type = alloc_utype (dip -> at_user_def_type, NULL);
|
|
}
|
|
}
|
|
else if (dip -> at_mod_u_d_type)
|
|
{
|
|
type = decode_mod_u_d_type (dip -> at_mod_u_d_type);
|
|
}
|
|
else
|
|
{
|
|
type = builtin_type_int;
|
|
}
|
|
return (type);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
struct_type -- compute and return the type for a struct or union
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *struct_type (struct dieinfo *dip, char *thisdie,
|
|
char *enddie, struct objfile *objfile)
|
|
|
|
DESCRIPTION
|
|
|
|
Given pointer to a die information structure for a die which
|
|
defines a union or structure (and MUST define one or the other),
|
|
and pointers to the raw die data that define the range of dies which
|
|
define the members, compute and return the user defined type for the
|
|
structure or union.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(struct_type, (dip, thisdie, enddie, objfile),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie AND
|
|
struct objfile *objfile)
|
|
{
|
|
struct type *type;
|
|
struct nextfield {
|
|
struct nextfield *next;
|
|
struct field field;
|
|
};
|
|
struct nextfield *list = NULL;
|
|
struct nextfield *new;
|
|
int nfields = 0;
|
|
int n;
|
|
char *tpart1;
|
|
struct dieinfo mbr;
|
|
char *nextdie;
|
|
|
|
if ((type = lookup_utype (dip -> dieref)) == NULL)
|
|
{
|
|
/* No forward references created an empty type, so install one now */
|
|
type = alloc_utype (dip -> dieref, NULL);
|
|
}
|
|
INIT_CPLUS_SPECIFIC(type);
|
|
switch (dip -> dietag)
|
|
{
|
|
case TAG_structure_type:
|
|
TYPE_CODE (type) = TYPE_CODE_STRUCT;
|
|
tpart1 = "struct";
|
|
break;
|
|
case TAG_union_type:
|
|
TYPE_CODE (type) = TYPE_CODE_UNION;
|
|
tpart1 = "union";
|
|
break;
|
|
default:
|
|
/* Should never happen */
|
|
TYPE_CODE (type) = TYPE_CODE_UNDEF;
|
|
tpart1 = "???";
|
|
SQUAWK (("missing structure or union tag"));
|
|
break;
|
|
}
|
|
/* Some compilers try to be helpful by inventing "fake" names for
|
|
anonymous enums, structures, and unions, like "~0fake" or ".0fake".
|
|
Thanks, but no thanks... */
|
|
if (dip -> at_name != NULL
|
|
&& *dip -> at_name != '~'
|
|
&& *dip -> at_name != '.')
|
|
{
|
|
TYPE_NAME (type) = obconcat (tpart1, " ", dip -> at_name);
|
|
}
|
|
if (dip -> at_byte_size != 0)
|
|
{
|
|
TYPE_LENGTH (type) = dip -> at_byte_size;
|
|
}
|
|
thisdie += dip -> dielength;
|
|
while (thisdie < enddie)
|
|
{
|
|
basicdieinfo (&mbr, thisdie);
|
|
completedieinfo (&mbr);
|
|
if (mbr.dielength <= sizeof (long))
|
|
{
|
|
break;
|
|
}
|
|
else if (mbr.at_sibling != 0)
|
|
{
|
|
nextdie = dbbase + mbr.at_sibling - dbroff;
|
|
}
|
|
else
|
|
{
|
|
nextdie = thisdie + mbr.dielength;
|
|
}
|
|
switch (mbr.dietag)
|
|
{
|
|
case TAG_member:
|
|
/* Get space to record the next field's data. */
|
|
new = (struct nextfield *) alloca (sizeof (struct nextfield));
|
|
new -> next = list;
|
|
list = new;
|
|
/* Save the data. */
|
|
list -> field.name = savestring (mbr.at_name, strlen (mbr.at_name));
|
|
list -> field.type = decode_die_type (&mbr);
|
|
list -> field.bitpos = 8 * locval (mbr.at_location);
|
|
list -> field.bitsize = 0;
|
|
nfields++;
|
|
break;
|
|
default:
|
|
process_dies (thisdie, nextdie, objfile);
|
|
break;
|
|
}
|
|
thisdie = nextdie;
|
|
}
|
|
/* Now create the vector of fields, and record how big it is. We may
|
|
not even have any fields, if this DIE was generated due to a reference
|
|
to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
|
|
set, which clues gdb in to the fact that it needs to search elsewhere
|
|
for the full structure definition. */
|
|
if (nfields == 0)
|
|
{
|
|
TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
|
|
}
|
|
else
|
|
{
|
|
TYPE_NFIELDS (type) = nfields;
|
|
TYPE_FIELDS (type) = (struct field *)
|
|
obstack_alloc (symbol_obstack, sizeof (struct field) * nfields);
|
|
/* Copy the saved-up fields into the field vector. */
|
|
for (n = nfields; list; list = list -> next)
|
|
{
|
|
TYPE_FIELD (type, --n) = list -> field;
|
|
}
|
|
}
|
|
return (type);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_structure_scope -- process all dies within struct or union
|
|
|
|
SYNOPSIS
|
|
|
|
static void read_structure_scope (struct dieinfo *dip,
|
|
char *thisdie, char *enddie, struct objfile *objfile)
|
|
|
|
DESCRIPTION
|
|
|
|
Called when we find the DIE that starts a structure or union
|
|
scope (definition) to process all dies that define the members
|
|
of the structure or union. DIP is a pointer to the die info
|
|
struct for the DIE that names the structure or union.
|
|
|
|
NOTES
|
|
|
|
Note that we need to call struct_type regardless of whether or not
|
|
the DIE has an at_name attribute, since it might be an anonymous
|
|
structure or union. This gets the type entered into our set of
|
|
user defined types.
|
|
|
|
However, if the structure is incomplete (an opaque struct/union)
|
|
then suppress creating a symbol table entry for it since gdb only
|
|
wants to find the one with the complete definition. Note that if
|
|
it is complete, we just call new_symbol, which does it's own
|
|
checking about whether the struct/union is anonymous or not (and
|
|
suppresses creating a symbol table entry itself).
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(read_structure_scope, (dip, thisdie, enddie, objfile),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie AND
|
|
struct objfile *objfile)
|
|
{
|
|
struct type *type;
|
|
struct symbol *sym;
|
|
|
|
type = struct_type (dip, thisdie, enddie, objfile);
|
|
if (!(TYPE_FLAGS (type) & TYPE_FLAG_STUB))
|
|
{
|
|
if ((sym = new_symbol (dip)) != NULL)
|
|
{
|
|
SYMBOL_TYPE (sym) = type;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_array_element_type -- decode type of the array elements
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *decode_array_element_type (char *scan, char *end)
|
|
|
|
DESCRIPTION
|
|
|
|
As the last step in decoding the array subscript information for an
|
|
array DIE, we need to decode the type of the array elements. We are
|
|
passed a pointer to this last part of the subscript information and
|
|
must return the appropriate type. If the type attribute is not
|
|
recognized, just warn about the problem and return type int.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_array_element_type, (scan, end), char *scan AND char *end)
|
|
{
|
|
struct type *typep;
|
|
short attribute;
|
|
DIEREF dieref;
|
|
unsigned short fundtype;
|
|
|
|
(void) memcpy (&attribute, scan, sizeof (short));
|
|
scan += sizeof (short);
|
|
switch (attribute)
|
|
{
|
|
case AT_fund_type:
|
|
(void) memcpy (&fundtype, scan, sizeof (short));
|
|
typep = decode_fund_type (fundtype);
|
|
break;
|
|
case AT_mod_fund_type:
|
|
typep = decode_mod_fund_type (scan);
|
|
break;
|
|
case AT_user_def_type:
|
|
(void) memcpy (&dieref, scan, sizeof (DIEREF));
|
|
if ((typep = lookup_utype (dieref)) == NULL)
|
|
{
|
|
typep = alloc_utype (dieref, NULL);
|
|
}
|
|
break;
|
|
case AT_mod_u_d_type:
|
|
typep = decode_mod_u_d_type (scan);
|
|
break;
|
|
default:
|
|
SQUAWK (("bad array element type attribute 0x%x", attribute));
|
|
typep = builtin_type_int;
|
|
break;
|
|
}
|
|
return (typep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_subscr_data -- decode array subscript and element type data
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *decode_subscr_data (char *scan, char *end)
|
|
|
|
DESCRIPTION
|
|
|
|
The array subscripts and the data type of the elements of an
|
|
array are described by a list of data items, stored as a block
|
|
of contiguous bytes. There is a data item describing each array
|
|
dimension, and a final data item describing the element type.
|
|
The data items are ordered the same as their appearance in the
|
|
source (I.E. leftmost dimension first, next to leftmost second,
|
|
etc).
|
|
|
|
We are passed a pointer to the start of the block of bytes
|
|
containing the data items, and a pointer to the first byte past
|
|
the data. This function decodes the data and returns a type.
|
|
|
|
BUGS
|
|
FIXME: This code only implements the forms currently used
|
|
by the AT&T and GNU C compilers.
|
|
|
|
The end pointer is supplied for error checking, maybe we should
|
|
use it for that...
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_subscr_data, (scan, end), char *scan AND char *end)
|
|
{
|
|
struct type *typep = NULL;
|
|
struct type *nexttype;
|
|
int format;
|
|
short fundtype;
|
|
long lowbound;
|
|
long highbound;
|
|
|
|
format = *scan++;
|
|
switch (format)
|
|
{
|
|
case FMT_ET:
|
|
typep = decode_array_element_type (scan, end);
|
|
break;
|
|
case FMT_FT_C_C:
|
|
(void) memcpy (&fundtype, scan, sizeof (short));
|
|
scan += sizeof (short);
|
|
if (fundtype != FT_integer && fundtype != FT_signed_integer
|
|
&& fundtype != FT_unsigned_integer)
|
|
{
|
|
SQUAWK (("array subscripts must be integral types, not type 0x%x",
|
|
fundtype));
|
|
}
|
|
else
|
|
{
|
|
(void) memcpy (&lowbound, scan, sizeof (long));
|
|
scan += sizeof (long);
|
|
(void) memcpy (&highbound, scan, sizeof (long));
|
|
scan += sizeof (long);
|
|
nexttype = decode_subscr_data (scan, end);
|
|
if (nexttype != NULL)
|
|
{
|
|
typep = (struct type *)
|
|
obstack_alloc (symbol_obstack, sizeof (struct type));
|
|
(void) memset (typep, 0, sizeof (struct type));
|
|
TYPE_CODE (typep) = TYPE_CODE_ARRAY;
|
|
TYPE_LENGTH (typep) = TYPE_LENGTH (nexttype);
|
|
TYPE_LENGTH (typep) *= lowbound + highbound + 1;
|
|
TYPE_TARGET_TYPE (typep) = nexttype;
|
|
}
|
|
}
|
|
break;
|
|
case FMT_FT_C_X:
|
|
case FMT_FT_X_C:
|
|
case FMT_FT_X_X:
|
|
case FMT_UT_C_C:
|
|
case FMT_UT_C_X:
|
|
case FMT_UT_X_C:
|
|
case FMT_UT_X_X:
|
|
SQUAWK (("array subscript format 0x%x not handled yet", format));
|
|
break;
|
|
default:
|
|
SQUAWK (("unknown array subscript format %x", format));
|
|
break;
|
|
}
|
|
return (typep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
dwarf_read_array_type -- read TAG_array_type DIE
|
|
|
|
SYNOPSIS
|
|
|
|
static void dwarf_read_array_type (struct dieinfo *dip)
|
|
|
|
DESCRIPTION
|
|
|
|
Extract all information from a TAG_array_type DIE and add to
|
|
the user defined type vector.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(dwarf_read_array_type, (dip), struct dieinfo *dip)
|
|
{
|
|
struct type *type;
|
|
char *sub;
|
|
char *subend;
|
|
short temp;
|
|
|
|
if (dip -> at_ordering != ORD_row_major)
|
|
{
|
|
/* FIXME: Can gdb even handle column major arrays? */
|
|
SQUAWK (("array not row major; not handled correctly"));
|
|
}
|
|
if ((sub = dip -> at_subscr_data) != NULL)
|
|
{
|
|
(void) memcpy (&temp, sub, sizeof (short));
|
|
subend = sub + sizeof (short) + temp;
|
|
sub += sizeof (short);
|
|
type = decode_subscr_data (sub, subend);
|
|
if (type == NULL)
|
|
{
|
|
type = alloc_utype (dip -> dieref, NULL);
|
|
TYPE_CODE (type) = TYPE_CODE_ARRAY;
|
|
TYPE_TARGET_TYPE (type) = builtin_type_int;
|
|
TYPE_LENGTH (type) = 1 * TYPE_LENGTH (TYPE_TARGET_TYPE (type));
|
|
}
|
|
else
|
|
{
|
|
type = alloc_utype (dip -> dieref, type);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_subroutine_type -- process TAG_subroutine_type dies
|
|
|
|
SYNOPSIS
|
|
|
|
static void read_subroutine_type (struct dieinfo *dip, char thisdie,
|
|
char *enddie)
|
|
|
|
DESCRIPTION
|
|
|
|
Handle DIES due to C code like:
|
|
|
|
struct foo {
|
|
int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
|
|
int b;
|
|
};
|
|
|
|
NOTES
|
|
|
|
The parameter DIES are currently ignored. See if gdb has a way to
|
|
include this info in it's type system, and decode them if so. Is
|
|
this what the type structure's "arg_types" field is for? (FIXME)
|
|
*/
|
|
|
|
static void
|
|
DEFUN(read_subroutine_type, (dip, thisdie, enddie),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie)
|
|
{
|
|
struct type *type;
|
|
|
|
type = decode_die_type (dip);
|
|
type = lookup_function_type (type);
|
|
type = alloc_utype (dip -> dieref, type);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_enumeration -- process dies which define an enumeration
|
|
|
|
SYNOPSIS
|
|
|
|
static void read_enumeration (struct dieinfo *dip, char *thisdie,
|
|
char *enddie)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to a die which begins an enumeration, process all
|
|
the dies that define the members of the enumeration.
|
|
|
|
NOTES
|
|
|
|
Note that we need to call enum_type regardless of whether or not we
|
|
have a symbol, since we might have an enum without a tag name (thus
|
|
no symbol for the tagname).
|
|
*/
|
|
|
|
static void
|
|
DEFUN(read_enumeration, (dip, thisdie, enddie),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie)
|
|
{
|
|
struct type *type;
|
|
struct symbol *sym;
|
|
|
|
type = enum_type (dip);
|
|
if ((sym = new_symbol (dip)) != NULL)
|
|
{
|
|
SYMBOL_TYPE (sym) = type;
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
enum_type -- decode and return a type for an enumeration
|
|
|
|
SYNOPSIS
|
|
|
|
static type *enum_type (struct dieinfo *dip)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to a die information structure for the die which
|
|
starts an enumeration, process all the dies that define the members
|
|
of the enumeration and return a type pointer for the enumeration.
|
|
|
|
At the same time, for each member of the enumeration, create a
|
|
symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
|
|
and give it the type of the enumeration itself.
|
|
|
|
NOTES
|
|
|
|
Note that the DWARF specification explicitly mandates that enum
|
|
constants occur in reverse order from the source program order,
|
|
for "consistency" and because this ordering is easier for many
|
|
compilers to generate. (Draft 5, sec 3.9.5, Enumeration type
|
|
Entries). Because gdb wants to see the enum members in program
|
|
source order, we have to ensure that the order gets reversed while
|
|
we are processing them.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(enum_type, (dip), struct dieinfo *dip)
|
|
{
|
|
struct type *type;
|
|
struct nextfield {
|
|
struct nextfield *next;
|
|
struct field field;
|
|
};
|
|
struct nextfield *list = NULL;
|
|
struct nextfield *new;
|
|
int nfields = 0;
|
|
int n;
|
|
char *scan;
|
|
char *listend;
|
|
long ltemp;
|
|
short stemp;
|
|
struct symbol *sym;
|
|
|
|
if ((type = lookup_utype (dip -> dieref)) == NULL)
|
|
{
|
|
/* No forward references created an empty type, so install one now */
|
|
type = alloc_utype (dip -> dieref, NULL);
|
|
}
|
|
TYPE_CODE (type) = TYPE_CODE_ENUM;
|
|
/* Some compilers try to be helpful by inventing "fake" names for
|
|
anonymous enums, structures, and unions, like "~0fake" or ".0fake".
|
|
Thanks, but no thanks... */
|
|
if (dip -> at_name != NULL
|
|
&& *dip -> at_name != '~'
|
|
&& *dip -> at_name != '.')
|
|
{
|
|
TYPE_NAME (type) = obconcat ("enum", " ", dip -> at_name);
|
|
}
|
|
if (dip -> at_byte_size != 0)
|
|
{
|
|
TYPE_LENGTH (type) = dip -> at_byte_size;
|
|
}
|
|
if ((scan = dip -> at_element_list) != NULL)
|
|
{
|
|
if (dip -> short_element_list)
|
|
{
|
|
(void) memcpy (&stemp, scan, sizeof (stemp));
|
|
listend = scan + stemp + sizeof (stemp);
|
|
scan += sizeof (stemp);
|
|
}
|
|
else
|
|
{
|
|
(void) memcpy (<emp, scan, sizeof (ltemp));
|
|
listend = scan + ltemp + sizeof (ltemp);
|
|
scan += sizeof (ltemp);
|
|
}
|
|
while (scan < listend)
|
|
{
|
|
new = (struct nextfield *) alloca (sizeof (struct nextfield));
|
|
new -> next = list;
|
|
list = new;
|
|
list -> field.type = NULL;
|
|
list -> field.bitsize = 0;
|
|
(void) memcpy (&list -> field.bitpos, scan, sizeof (long));
|
|
scan += sizeof (long);
|
|
list -> field.name = savestring (scan, strlen (scan));
|
|
scan += strlen (scan) + 1;
|
|
nfields++;
|
|
/* Handcraft a new symbol for this enum member. */
|
|
sym = (struct symbol *) obstack_alloc (symbol_obstack,
|
|
sizeof (struct symbol));
|
|
(void) memset (sym, 0, sizeof (struct symbol));
|
|
SYMBOL_NAME (sym) = create_name (list -> field.name, symbol_obstack);
|
|
SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
|
|
SYMBOL_CLASS (sym) = LOC_CONST;
|
|
SYMBOL_TYPE (sym) = type;
|
|
SYMBOL_VALUE (sym) = list -> field.bitpos;
|
|
add_symbol_to_list (sym, list_in_scope);
|
|
}
|
|
/* Now create the vector of fields, and record how big it is. This is
|
|
where we reverse the order, by pulling the members of the list in
|
|
reverse order from how they were inserted. If we have no fields
|
|
(this is apparently possible in C++) then skip building a field
|
|
vector. */
|
|
if (nfields > 0)
|
|
{
|
|
TYPE_NFIELDS (type) = nfields;
|
|
TYPE_FIELDS (type) = (struct field *)
|
|
obstack_alloc (symbol_obstack, sizeof (struct field) * nfields);
|
|
/* Copy the saved-up fields into the field vector. */
|
|
for (n = 0; (n < nfields) && (list != NULL); list = list -> next)
|
|
{
|
|
TYPE_FIELD (type, n++) = list -> field;
|
|
}
|
|
}
|
|
}
|
|
return (type);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_func_scope -- process all dies within a function scope
|
|
|
|
DESCRIPTION
|
|
|
|
Process all dies within a given function scope. We are passed
|
|
a die information structure pointer DIP for the die which
|
|
starts the function scope, and pointers into the raw die data
|
|
that define the dies within the function scope.
|
|
|
|
For now, we ignore lexical block scopes within the function.
|
|
The problem is that AT&T cc does not define a DWARF lexical
|
|
block scope for the function itself, while gcc defines a
|
|
lexical block scope for the function. We need to think about
|
|
how to handle this difference, or if it is even a problem.
|
|
(FIXME)
|
|
*/
|
|
|
|
static void
|
|
DEFUN(read_func_scope, (dip, thisdie, enddie, objfile),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie AND
|
|
struct objfile *objfile)
|
|
{
|
|
register struct context_stack *new;
|
|
|
|
if (entry_point >= dip -> at_low_pc && entry_point < dip -> at_high_pc)
|
|
{
|
|
entry_scope_lowpc = dip -> at_low_pc;
|
|
entry_scope_highpc = dip -> at_high_pc;
|
|
}
|
|
if (STREQ (dip -> at_name, "main")) /* FIXME: hardwired name */
|
|
{
|
|
main_scope_lowpc = dip -> at_low_pc;
|
|
main_scope_highpc = dip -> at_high_pc;
|
|
}
|
|
new = push_context (0, dip -> at_low_pc);
|
|
new -> name = new_symbol (dip);
|
|
list_in_scope = &local_symbols;
|
|
process_dies (thisdie + dip -> dielength, enddie, objfile);
|
|
new = pop_context ();
|
|
/* Make a block for the local symbols within. */
|
|
finish_block (new -> name, &local_symbols, new -> old_blocks,
|
|
new -> start_addr, dip -> at_high_pc);
|
|
list_in_scope = &file_symbols;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_file_scope -- process all dies within a file scope
|
|
|
|
DESCRIPTION
|
|
|
|
Process all dies within a given file scope. We are passed a
|
|
pointer to the die information structure for the die which
|
|
starts the file scope, and pointers into the raw die data which
|
|
mark the range of dies within the file scope.
|
|
|
|
When the partial symbol table is built, the file offset for the line
|
|
number table for each compilation unit is saved in the partial symbol
|
|
table entry for that compilation unit. As the symbols for each
|
|
compilation unit are read, the line number table is read into memory
|
|
and the variable lnbase is set to point to it. Thus all we have to
|
|
do is use lnbase to access the line number table for the current
|
|
compilation unit.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(read_file_scope, (dip, thisdie, enddie, objfile),
|
|
struct dieinfo *dip AND
|
|
char *thisdie AND
|
|
char *enddie AND
|
|
struct objfile *objfile)
|
|
{
|
|
struct cleanup *back_to;
|
|
struct symtab *symtab;
|
|
|
|
if (entry_point >= dip -> at_low_pc && entry_point < dip -> at_high_pc)
|
|
{
|
|
startup_file_start = dip -> at_low_pc;
|
|
startup_file_end = dip -> at_high_pc;
|
|
}
|
|
if (dip -> at_producer != NULL)
|
|
{
|
|
processing_gcc_compilation =
|
|
STREQN (dip -> at_producer, GCC_PRODUCER, strlen (GCC_PRODUCER));
|
|
}
|
|
numutypes = (enddie - thisdie) / 4;
|
|
utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *));
|
|
back_to = make_cleanup (free, utypes);
|
|
(void) memset (utypes, 0, numutypes * sizeof (struct type *));
|
|
start_symtab (dip -> at_name, NULL, dip -> at_low_pc);
|
|
decode_line_numbers (lnbase);
|
|
process_dies (thisdie + dip -> dielength, enddie, objfile);
|
|
symtab = end_symtab (dip -> at_high_pc, 0, 0, objfile);
|
|
/* FIXME: The following may need to be expanded for other languages */
|
|
switch (dip -> at_language)
|
|
{
|
|
case LANG_C89:
|
|
case LANG_C:
|
|
symtab -> language = language_c;
|
|
break;
|
|
case LANG_C_PLUS_PLUS:
|
|
symtab -> language = language_cplus;
|
|
break;
|
|
default:
|
|
;
|
|
}
|
|
do_cleanups (back_to);
|
|
utypes = NULL;
|
|
numutypes = 0;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
process_dies -- process a range of DWARF Information Entries
|
|
|
|
SYNOPSIS
|
|
|
|
static void process_dies (char *thisdie, char *enddie,
|
|
struct objfile *objfile)
|
|
|
|
DESCRIPTION
|
|
|
|
Process all DIE's in a specified range. May be (and almost
|
|
certainly will be) called recursively.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(process_dies, (thisdie, enddie, objfile),
|
|
char *thisdie AND char *enddie AND struct objfile *objfile)
|
|
{
|
|
char *nextdie;
|
|
struct dieinfo di;
|
|
|
|
while (thisdie < enddie)
|
|
{
|
|
basicdieinfo (&di, thisdie);
|
|
if (di.dielength < sizeof (long))
|
|
{
|
|
break;
|
|
}
|
|
else if (di.dietag == TAG_padding)
|
|
{
|
|
nextdie = thisdie + di.dielength;
|
|
}
|
|
else
|
|
{
|
|
completedieinfo (&di);
|
|
if (di.at_sibling != 0)
|
|
{
|
|
nextdie = dbbase + di.at_sibling - dbroff;
|
|
}
|
|
else
|
|
{
|
|
nextdie = thisdie + di.dielength;
|
|
}
|
|
switch (di.dietag)
|
|
{
|
|
case TAG_compile_unit:
|
|
read_file_scope (&di, thisdie, nextdie, objfile);
|
|
break;
|
|
case TAG_global_subroutine:
|
|
case TAG_subroutine:
|
|
if (di.has_at_low_pc)
|
|
{
|
|
read_func_scope (&di, thisdie, nextdie, objfile);
|
|
}
|
|
break;
|
|
case TAG_lexical_block:
|
|
read_lexical_block_scope (&di, thisdie, nextdie, objfile);
|
|
break;
|
|
case TAG_structure_type:
|
|
case TAG_union_type:
|
|
read_structure_scope (&di, thisdie, nextdie, objfile);
|
|
break;
|
|
case TAG_enumeration_type:
|
|
read_enumeration (&di, thisdie, nextdie);
|
|
break;
|
|
case TAG_subroutine_type:
|
|
read_subroutine_type (&di, thisdie, nextdie);
|
|
break;
|
|
case TAG_array_type:
|
|
dwarf_read_array_type (&di);
|
|
break;
|
|
default:
|
|
(void) new_symbol (&di);
|
|
break;
|
|
}
|
|
}
|
|
thisdie = nextdie;
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_line_numbers -- decode a line number table fragment
|
|
|
|
SYNOPSIS
|
|
|
|
static void decode_line_numbers (char *tblscan, char *tblend,
|
|
long length, long base, long line, long pc)
|
|
|
|
DESCRIPTION
|
|
|
|
Translate the DWARF line number information to gdb form.
|
|
|
|
The ".line" section contains one or more line number tables, one for
|
|
each ".line" section from the objects that were linked.
|
|
|
|
The AT_stmt_list attribute for each TAG_source_file entry in the
|
|
".debug" section contains the offset into the ".line" section for the
|
|
start of the table for that file.
|
|
|
|
The table itself has the following structure:
|
|
|
|
<table length><base address><source statement entry>
|
|
4 bytes 4 bytes 10 bytes
|
|
|
|
The table length is the total size of the table, including the 4 bytes
|
|
for the length information.
|
|
|
|
The base address is the address of the first instruction generated
|
|
for the source file.
|
|
|
|
Each source statement entry has the following structure:
|
|
|
|
<line number><statement position><address delta>
|
|
4 bytes 2 bytes 4 bytes
|
|
|
|
The line number is relative to the start of the file, starting with
|
|
line 1.
|
|
|
|
The statement position either -1 (0xFFFF) or the number of characters
|
|
from the beginning of the line to the beginning of the statement.
|
|
|
|
The address delta is the difference between the base address and
|
|
the address of the first instruction for the statement.
|
|
|
|
Note that we must copy the bytes from the packed table to our local
|
|
variables before attempting to use them, to avoid alignment problems
|
|
on some machines, particularly RISC processors.
|
|
|
|
BUGS
|
|
|
|
Does gdb expect the line numbers to be sorted? They are now by
|
|
chance/luck, but are not required to be. (FIXME)
|
|
|
|
The line with number 0 is unused, gdb apparently can discover the
|
|
span of the last line some other way. How? (FIXME)
|
|
*/
|
|
|
|
static void
|
|
DEFUN(decode_line_numbers, (linetable), char *linetable)
|
|
{
|
|
char *tblscan;
|
|
char *tblend;
|
|
long length;
|
|
long base;
|
|
long line;
|
|
long pc;
|
|
|
|
if (linetable != NULL)
|
|
{
|
|
tblscan = tblend = linetable;
|
|
(void) memcpy (&length, tblscan, sizeof (long));
|
|
tblscan += sizeof (long);
|
|
tblend += length;
|
|
(void) memcpy (&base, tblscan, sizeof (long));
|
|
base += baseaddr;
|
|
tblscan += sizeof (long);
|
|
while (tblscan < tblend)
|
|
{
|
|
(void) memcpy (&line, tblscan, sizeof (long));
|
|
tblscan += sizeof (long) + sizeof (short);
|
|
(void) memcpy (&pc, tblscan, sizeof (long));
|
|
tblscan += sizeof (long);
|
|
pc += base;
|
|
if (line > 0)
|
|
{
|
|
record_line (current_subfile, line, pc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
locval -- compute the value of a location attribute
|
|
|
|
SYNOPSIS
|
|
|
|
static int locval (char *loc)
|
|
|
|
DESCRIPTION
|
|
|
|
Given pointer to a string of bytes that define a location, compute
|
|
the location and return the value.
|
|
|
|
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
|
|
pointer, rather than the absolute value. This is what GDB wants
|
|
anyway.
|
|
|
|
When the result is a register number, the global isreg flag is set,
|
|
otherwise it is cleared. This is a kludge until we figure out a better
|
|
way to handle the problem. Gdb's design does not mesh well with the
|
|
DWARF notion of a location computing interpreter, which is a shame
|
|
because the flexibility goes unused.
|
|
|
|
NOTES
|
|
|
|
Note that stack[0] is unused except as a default error return.
|
|
Note that stack overflow is not yet handled.
|
|
*/
|
|
|
|
static int
|
|
DEFUN(locval, (loc), char *loc)
|
|
{
|
|
unsigned short nbytes;
|
|
auto int stack[64];
|
|
int stacki;
|
|
char *end;
|
|
long regno;
|
|
|
|
(void) memcpy (&nbytes, loc, sizeof (short));
|
|
end = loc + sizeof (short) + nbytes;
|
|
stacki = 0;
|
|
stack[stacki] = 0;
|
|
isreg = 0;
|
|
offreg = 0;
|
|
for (loc += sizeof (short); loc < end; loc += sizeof (long))
|
|
{
|
|
switch (*loc++) {
|
|
case 0:
|
|
/* error */
|
|
loc = end;
|
|
break;
|
|
case OP_REG:
|
|
/* push register (number) */
|
|
(void) memcpy (&stack[++stacki], loc, sizeof (long));
|
|
isreg = 1;
|
|
break;
|
|
case OP_BASEREG:
|
|
/* push value of register (number) */
|
|
/* Actually, we compute the value as if register has 0 */
|
|
offreg = 1;
|
|
(void) memcpy (®no, loc, sizeof (long));
|
|
if (regno == R_FP)
|
|
{
|
|
stack[++stacki] = 0;
|
|
}
|
|
else
|
|
{
|
|
stack[++stacki] = 0;
|
|
SQUAWK (("BASEREG %d not handled!", regno));
|
|
}
|
|
break;
|
|
case OP_ADDR:
|
|
/* push address (relocated address) */
|
|
(void) memcpy (&stack[++stacki], loc, sizeof (long));
|
|
break;
|
|
case OP_CONST:
|
|
/* push constant (number) */
|
|
(void) memcpy (&stack[++stacki], loc, sizeof (long));
|
|
break;
|
|
case OP_DEREF2:
|
|
/* pop, deref and push 2 bytes (as a long) */
|
|
SQUAWK (("OP_DEREF2 address %#x not handled", stack[stacki]));
|
|
break;
|
|
case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */
|
|
SQUAWK (("OP_DEREF4 address %#x not handled", stack[stacki]));
|
|
break;
|
|
case OP_ADD: /* pop top 2 items, add, push result */
|
|
stack[stacki - 1] += stack[stacki];
|
|
stacki--;
|
|
break;
|
|
}
|
|
}
|
|
return (stack[stacki]);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
read_ofile_symtab -- build a full symtab entry from chunk of DIE's
|
|
|
|
SYNOPSIS
|
|
|
|
static struct symtab *read_ofile_symtab (struct partial_symtab *pst)
|
|
|
|
DESCRIPTION
|
|
|
|
*/
|
|
|
|
static struct symtab *
|
|
DEFUN(read_ofile_symtab, (pst),
|
|
struct partial_symtab *pst)
|
|
{
|
|
struct cleanup *back_to;
|
|
long lnsize;
|
|
int foffset;
|
|
bfd *abfd = pst->objfile->obfd;
|
|
|
|
/* Allocate a buffer for the entire chunk of DIE's for this compilation
|
|
unit, seek to the location in the file, and read in all the DIE's. */
|
|
|
|
diecount = 0;
|
|
dbbase = xmalloc (DBLENGTH(pst));
|
|
dbroff = DBROFF(pst);
|
|
foffset = DBFOFF(pst) + dbroff;
|
|
baseaddr = pst -> addr;
|
|
if (bfd_seek (abfd, foffset, 0) ||
|
|
(bfd_read (dbbase, DBLENGTH(pst), 1, abfd) != DBLENGTH(pst)))
|
|
{
|
|
free (dbbase);
|
|
error ("can't read DWARF data");
|
|
}
|
|
back_to = make_cleanup (free, dbbase);
|
|
|
|
/* If there is a line number table associated with this compilation unit
|
|
then read the first long word from the line number table fragment, which
|
|
contains the size of the fragment in bytes (including the long word
|
|
itself). Allocate a buffer for the fragment and read it in for future
|
|
processing. */
|
|
|
|
lnbase = NULL;
|
|
if (LNFOFF (pst))
|
|
{
|
|
if (bfd_seek (abfd, LNFOFF (pst), 0) ||
|
|
(bfd_read (&lnsize, sizeof(long), 1, abfd) != sizeof(long)))
|
|
{
|
|
error ("can't read DWARF line number table size");
|
|
}
|
|
lnbase = xmalloc (lnsize);
|
|
if (bfd_seek (abfd, LNFOFF (pst), 0) ||
|
|
(bfd_read (lnbase, lnsize, 1, abfd) != lnsize))
|
|
{
|
|
free (lnbase);
|
|
error ("can't read DWARF line numbers");
|
|
}
|
|
make_cleanup (free, lnbase);
|
|
}
|
|
|
|
process_dies (dbbase, dbbase + DBLENGTH(pst), pst -> objfile);
|
|
do_cleanups (back_to);
|
|
return (symtab_list);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
|
|
|
|
SYNOPSIS
|
|
|
|
static void psymtab_to_symtab_1 (struct partial_symtab *pst)
|
|
|
|
DESCRIPTION
|
|
|
|
Called once for each partial symbol table entry that needs to be
|
|
expanded into a full symbol table entry.
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(psymtab_to_symtab_1,
|
|
(pst),
|
|
struct partial_symtab *pst)
|
|
{
|
|
int i;
|
|
|
|
if (!pst)
|
|
{
|
|
return;
|
|
}
|
|
if (pst->readin)
|
|
{
|
|
fprintf (stderr, "Psymtab for %s already read in. Shouldn't happen.\n",
|
|
pst -> filename);
|
|
return;
|
|
}
|
|
|
|
/* Read in all partial symtabs on which this one is dependent */
|
|
for (i = 0; i < pst -> number_of_dependencies; i++)
|
|
if (!pst -> dependencies[i] -> readin)
|
|
{
|
|
/* Inform about additional files that need to be read in. */
|
|
if (info_verbose)
|
|
{
|
|
fputs_filtered (" ", stdout);
|
|
wrap_here ("");
|
|
fputs_filtered ("and ", stdout);
|
|
wrap_here ("");
|
|
printf_filtered ("%s...", pst -> dependencies[i] -> filename);
|
|
wrap_here (""); /* Flush output */
|
|
fflush (stdout);
|
|
}
|
|
psymtab_to_symtab_1 (pst -> dependencies[i]);
|
|
}
|
|
|
|
if (DBLENGTH(pst)) /* Otherwise it's a dummy */
|
|
{
|
|
pst -> symtab = read_ofile_symtab (pst);
|
|
if (info_verbose)
|
|
{
|
|
printf_filtered ("%d DIE's, sorting...", diecount);
|
|
fflush (stdout);
|
|
}
|
|
sort_symtab_syms (pst -> symtab);
|
|
}
|
|
pst -> readin = 1;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
|
|
|
|
SYNOPSIS
|
|
|
|
static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
|
|
|
|
DESCRIPTION
|
|
|
|
This is the DWARF support entry point for building a full symbol
|
|
table entry from a partial symbol table entry. We are passed a
|
|
pointer to the partial symbol table entry that needs to be expanded.
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(dwarf_psymtab_to_symtab, (pst), struct partial_symtab *pst)
|
|
{
|
|
|
|
if (!pst)
|
|
{
|
|
return;
|
|
}
|
|
if (pst -> readin)
|
|
{
|
|
fprintf (stderr, "Psymtab for %s already read in. Shouldn't happen.\n",
|
|
pst -> filename);
|
|
return;
|
|
}
|
|
|
|
if (DBLENGTH(pst) || pst -> number_of_dependencies)
|
|
{
|
|
/* Print the message now, before starting serious work, to avoid
|
|
disconcerting pauses. */
|
|
if (info_verbose)
|
|
{
|
|
printf_filtered ("Reading in symbols for %s...", pst -> filename);
|
|
fflush (stdout);
|
|
}
|
|
|
|
psymtab_to_symtab_1 (pst);
|
|
|
|
#if 0 /* FIXME: Check to see what dbxread is doing here and see if
|
|
we need to do an equivalent or is this something peculiar to
|
|
stabs/a.out format. */
|
|
/* Match with global symbols. This only needs to be done once,
|
|
after all of the symtabs and dependencies have been read in. */
|
|
scan_file_globals ();
|
|
#endif
|
|
|
|
/* Finish up the debug error message. */
|
|
if (info_verbose)
|
|
{
|
|
printf_filtered ("done.\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
init_psymbol_list -- initialize storage for partial symbols
|
|
|
|
SYNOPSIS
|
|
|
|
static void init_psymbol_list (int total_symbols)
|
|
|
|
DESCRIPTION
|
|
|
|
Initializes storage for all of the partial symbols that will be
|
|
created by dwarf_build_psymtabs and subsidiaries.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(init_psymbol_list, (total_symbols), int total_symbols)
|
|
{
|
|
/* Free any previously allocated psymbol lists. */
|
|
|
|
if (global_psymbols.list)
|
|
{
|
|
free (global_psymbols.list);
|
|
}
|
|
if (static_psymbols.list)
|
|
{
|
|
free (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 */
|
|
|
|
global_psymbols.size = total_symbols / 10;
|
|
static_psymbols.size = total_symbols / 10;
|
|
global_psymbols.next = global_psymbols.list = (struct partial_symbol *)
|
|
xmalloc (global_psymbols.size * sizeof (struct partial_symbol));
|
|
static_psymbols.next = static_psymbols.list = (struct partial_symbol *)
|
|
xmalloc (static_psymbols.size * sizeof (struct partial_symbol));
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
dwarf_start_psymtab -- allocate and fill a partial symtab entry
|
|
|
|
DESCRIPTION
|
|
|
|
Allocate and partially fill a partial symtab. It will be completely
|
|
filled at the end of the symbol list.
|
|
|
|
SYMFILE_NAME is the name of the symbol-file we are reading from, and
|
|
ADDR is the address relative to which its symbols are (incremental)
|
|
or 0 (normal). FILENAME is the name of the compilation unit that
|
|
these symbols were defined in, and they appear starting a address
|
|
TEXTLOW. DBROFF is the absolute file offset in SYMFILE_NAME where
|
|
the full symbols can be read for compilation unit FILENAME.
|
|
GLOBAL_SYMS and STATIC_SYMS are pointers to the current end of the
|
|
psymtab vector.
|
|
|
|
*/
|
|
|
|
static struct partial_symtab *
|
|
DEFUN(dwarf_start_psymtab,
|
|
(objfile, addr, filename, textlow, texthigh, dbfoff, curoff,
|
|
culength, lnfoff, global_syms, static_syms),
|
|
struct objfile *objfile AND
|
|
CORE_ADDR addr AND
|
|
char *filename AND
|
|
CORE_ADDR textlow AND
|
|
CORE_ADDR texthigh AND
|
|
int dbfoff AND
|
|
int curoff AND
|
|
int culength AND
|
|
int lnfoff AND
|
|
struct partial_symbol *global_syms AND
|
|
struct partial_symbol *static_syms)
|
|
{
|
|
struct partial_symtab *result;
|
|
|
|
result = (struct partial_symtab *)
|
|
obstack_alloc (psymbol_obstack, sizeof (struct partial_symtab));
|
|
(void) memset (result, 0, sizeof (struct partial_symtab));
|
|
result -> addr = addr;
|
|
result -> objfile = objfile;
|
|
result -> filename = create_name (filename, psymbol_obstack);
|
|
result -> textlow = textlow;
|
|
result -> texthigh = texthigh;
|
|
result -> read_symtab_private = (char *) obstack_alloc (psymbol_obstack,
|
|
sizeof (struct dwfinfo));
|
|
DBFOFF (result) = dbfoff;
|
|
DBROFF (result) = curoff;
|
|
DBLENGTH (result) = culength;
|
|
LNFOFF (result) = lnfoff;
|
|
result -> readin = 0;
|
|
result -> symtab = NULL;
|
|
result -> read_symtab = dwarf_psymtab_to_symtab;
|
|
result -> globals_offset = global_syms - global_psymbols.list;
|
|
result -> statics_offset = static_syms - static_psymbols.list;
|
|
|
|
result->n_global_syms = 0;
|
|
result->n_static_syms = 0;
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
add_enum_psymbol -- add enumeration members to partial symbol table
|
|
|
|
DESCRIPTION
|
|
|
|
Given pointer to a DIE that is known to be for an enumeration,
|
|
extract the symbolic names of the enumeration members and add
|
|
partial symbols for them.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(add_enum_psymbol, (dip), struct dieinfo *dip)
|
|
{
|
|
char *scan;
|
|
char *listend;
|
|
long ltemp;
|
|
short stemp;
|
|
|
|
if ((scan = dip -> at_element_list) != NULL)
|
|
{
|
|
if (dip -> short_element_list)
|
|
{
|
|
(void) memcpy (&stemp, scan, sizeof (stemp));
|
|
listend = scan + stemp + sizeof (stemp);
|
|
scan += sizeof (stemp);
|
|
}
|
|
else
|
|
{
|
|
(void) memcpy (<emp, scan, sizeof (ltemp));
|
|
listend = scan + ltemp + sizeof (ltemp);
|
|
scan += sizeof (ltemp);
|
|
}
|
|
while (scan < listend)
|
|
{
|
|
scan += sizeof (long);
|
|
ADD_PSYMBOL_TO_LIST (scan, strlen (scan), VAR_NAMESPACE, LOC_CONST,
|
|
static_psymbols, 0);
|
|
scan += strlen (scan) + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
add_partial_symbol -- add symbol to partial symbol table
|
|
|
|
DESCRIPTION
|
|
|
|
Given a DIE, if it is one of the types that we want to
|
|
add to a partial symbol table, finish filling in the die info
|
|
and then add a partial symbol table entry for it.
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(add_partial_symbol, (dip), struct dieinfo *dip)
|
|
{
|
|
switch (dip -> dietag)
|
|
{
|
|
case TAG_global_subroutine:
|
|
record_misc_function (dip -> at_name, dip -> at_low_pc, mf_text);
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
VAR_NAMESPACE, LOC_BLOCK, global_psymbols,
|
|
dip -> at_low_pc);
|
|
break;
|
|
case TAG_global_variable:
|
|
record_misc_function (dip -> at_name, locval (dip -> at_location),
|
|
mf_data);
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
VAR_NAMESPACE, LOC_STATIC, global_psymbols,
|
|
0);
|
|
break;
|
|
case TAG_subroutine:
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
VAR_NAMESPACE, LOC_BLOCK, static_psymbols,
|
|
dip -> at_low_pc);
|
|
break;
|
|
case TAG_local_variable:
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
VAR_NAMESPACE, LOC_STATIC, static_psymbols,
|
|
0);
|
|
break;
|
|
case TAG_typedef:
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
VAR_NAMESPACE, LOC_TYPEDEF, static_psymbols,
|
|
0);
|
|
break;
|
|
case TAG_structure_type:
|
|
case TAG_union_type:
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
STRUCT_NAMESPACE, LOC_TYPEDEF, static_psymbols,
|
|
0);
|
|
break;
|
|
case TAG_enumeration_type:
|
|
if (dip -> at_name)
|
|
{
|
|
ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name),
|
|
STRUCT_NAMESPACE, LOC_TYPEDEF, static_psymbols,
|
|
0);
|
|
}
|
|
add_enum_psymbol (dip);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
scan_partial_symbols -- scan DIE's within a single compilation unit
|
|
|
|
DESCRIPTION
|
|
|
|
Process the DIE's within a single compilation unit, looking for
|
|
interesting DIE's that contribute to the partial symbol table entry
|
|
for this compilation unit. Since we cannot follow any sibling
|
|
chains without reading the complete DIE info for every DIE,
|
|
it is probably faster to just sequentially check each one to
|
|
see if it is one of the types we are interested in, and if so,
|
|
then extract all the attributes info and generate a partial
|
|
symbol table entry.
|
|
|
|
NOTES
|
|
|
|
Don't attempt to add anonymous structures or unions since they have
|
|
no name. Anonymous enumerations however are processed, because we
|
|
want to extract their member names (the check for a tag name is
|
|
done later).
|
|
|
|
Also, for variables and subroutines, check that this is the place
|
|
where the actual definition occurs, rather than just a reference
|
|
to an external.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(scan_partial_symbols, (thisdie, enddie), char *thisdie AND char *enddie)
|
|
{
|
|
char *nextdie;
|
|
struct dieinfo di;
|
|
|
|
while (thisdie < enddie)
|
|
{
|
|
basicdieinfo (&di, thisdie);
|
|
if (di.dielength < sizeof (long))
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
nextdie = thisdie + di.dielength;
|
|
/* To avoid getting complete die information for every die, we
|
|
only do it (below) for the cases we are interested in. */
|
|
switch (di.dietag)
|
|
{
|
|
case TAG_global_subroutine:
|
|
case TAG_subroutine:
|
|
case TAG_global_variable:
|
|
case TAG_local_variable:
|
|
completedieinfo (&di);
|
|
if (di.at_name && (di.has_at_low_pc || di.at_location))
|
|
{
|
|
add_partial_symbol (&di);
|
|
}
|
|
break;
|
|
case TAG_typedef:
|
|
case TAG_structure_type:
|
|
case TAG_union_type:
|
|
completedieinfo (&di);
|
|
if (di.at_name)
|
|
{
|
|
add_partial_symbol (&di);
|
|
}
|
|
break;
|
|
case TAG_enumeration_type:
|
|
completedieinfo (&di);
|
|
add_partial_symbol (&di);
|
|
break;
|
|
}
|
|
}
|
|
thisdie = nextdie;
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
scan_compilation_units -- build a psymtab entry for each compilation
|
|
|
|
DESCRIPTION
|
|
|
|
This is the top level dwarf parsing routine for building partial
|
|
symbol tables.
|
|
|
|
It scans from the beginning of the DWARF table looking for the first
|
|
TAG_compile_unit DIE, and then follows the sibling chain to locate
|
|
each additional TAG_compile_unit DIE.
|
|
|
|
For each TAG_compile_unit DIE it creates a partial symtab structure,
|
|
calls a subordinate routine to collect all the compilation unit's
|
|
global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
|
|
new partial symtab structure into the partial symbol table. It also
|
|
records the appropriate information in the partial symbol table entry
|
|
to allow the chunk of DIE's and line number table for this compilation
|
|
unit to be located and re-read later, to generate a complete symbol
|
|
table entry for the compilation unit.
|
|
|
|
Thus it effectively partitions up a chunk of DIE's for multiple
|
|
compilation units into smaller DIE chunks and line number tables,
|
|
and associates them with a partial symbol table entry.
|
|
|
|
NOTES
|
|
|
|
If any compilation unit has no line number table associated with
|
|
it for some reason (a missing at_stmt_list attribute, rather than
|
|
just one with a value of zero, which is valid) then we ensure that
|
|
the recorded file offset is zero so that the routine which later
|
|
reads line number table fragments knows that there is no fragment
|
|
to read.
|
|
|
|
RETURNS
|
|
|
|
Returns no value.
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(scan_compilation_units,
|
|
(filename, thisdie, enddie, dbfoff, lnoffset, objfile),
|
|
char *filename AND
|
|
char *thisdie AND
|
|
char *enddie AND
|
|
unsigned int dbfoff AND
|
|
unsigned int lnoffset AND
|
|
struct objfile *objfile)
|
|
{
|
|
char *nextdie;
|
|
struct dieinfo di;
|
|
struct partial_symtab *pst;
|
|
int culength;
|
|
int curoff;
|
|
int curlnoffset;
|
|
|
|
while (thisdie < enddie)
|
|
{
|
|
basicdieinfo (&di, thisdie);
|
|
if (di.dielength < sizeof (long))
|
|
{
|
|
break;
|
|
}
|
|
else if (di.dietag != TAG_compile_unit)
|
|
{
|
|
nextdie = thisdie + di.dielength;
|
|
}
|
|
else
|
|
{
|
|
completedieinfo (&di);
|
|
if (di.at_sibling != 0)
|
|
{
|
|
nextdie = dbbase + di.at_sibling - dbroff;
|
|
}
|
|
else
|
|
{
|
|
nextdie = thisdie + di.dielength;
|
|
}
|
|
curoff = thisdie - dbbase;
|
|
culength = nextdie - thisdie;
|
|
curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0;
|
|
pst = dwarf_start_psymtab (objfile, baseaddr, di.at_name,
|
|
di.at_low_pc,
|
|
di.at_high_pc,
|
|
dbfoff, curoff, culength, curlnoffset,
|
|
global_psymbols.next,
|
|
static_psymbols.next);
|
|
scan_partial_symbols (thisdie + di.dielength, nextdie);
|
|
pst -> n_global_syms = global_psymbols.next -
|
|
(global_psymbols.list + pst -> globals_offset);
|
|
pst -> n_static_syms = static_psymbols.next -
|
|
(static_psymbols.list + pst -> statics_offset);
|
|
/* Sort the global list; don't sort the static list */
|
|
qsort (global_psymbols.list + pst -> globals_offset,
|
|
pst -> n_global_syms, sizeof (struct partial_symbol),
|
|
compare_psymbols);
|
|
/* If there is already a psymtab or symtab for a file of this name,
|
|
remove it. (If there is a symtab, more drastic things also
|
|
happen.) This happens in VxWorks. */
|
|
free_named_symtabs (pst -> filename);
|
|
/* Place the partial symtab on the partial symtab list */
|
|
pst -> next = partial_symtab_list;
|
|
partial_symtab_list = pst;
|
|
}
|
|
thisdie = nextdie;
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
new_symbol -- make a symbol table entry for a new symbol
|
|
|
|
SYNOPSIS
|
|
|
|
static struct symbol *new_symbol (struct dieinfo *dip)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to a DWARF information entry, figure out if we need
|
|
to make a symbol table entry for it, and if so, create a new entry
|
|
and return a pointer to it.
|
|
*/
|
|
|
|
static struct symbol *
|
|
DEFUN(new_symbol, (dip), struct dieinfo *dip)
|
|
{
|
|
struct symbol *sym = NULL;
|
|
|
|
if (dip -> at_name != NULL)
|
|
{
|
|
sym = (struct symbol *) obstack_alloc (symbol_obstack,
|
|
sizeof (struct symbol));
|
|
(void) memset (sym, 0, sizeof (struct symbol));
|
|
SYMBOL_NAME (sym) = create_name (dip -> at_name, symbol_obstack);
|
|
/* default assumptions */
|
|
SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
|
|
SYMBOL_CLASS (sym) = LOC_STATIC;
|
|
SYMBOL_TYPE (sym) = decode_die_type (dip);
|
|
switch (dip -> dietag)
|
|
{
|
|
case TAG_label:
|
|
SYMBOL_VALUE (sym) = dip -> at_low_pc;
|
|
SYMBOL_CLASS (sym) = LOC_LABEL;
|
|
break;
|
|
case TAG_global_subroutine:
|
|
case TAG_subroutine:
|
|
SYMBOL_VALUE (sym) = dip -> at_low_pc;
|
|
SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym));
|
|
SYMBOL_CLASS (sym) = LOC_BLOCK;
|
|
if (dip -> dietag == TAG_global_subroutine)
|
|
{
|
|
add_symbol_to_list (sym, &global_symbols);
|
|
}
|
|
else
|
|
{
|
|
add_symbol_to_list (sym, list_in_scope);
|
|
}
|
|
break;
|
|
case TAG_global_variable:
|
|
if (dip -> at_location != NULL)
|
|
{
|
|
SYMBOL_VALUE (sym) = locval (dip -> at_location);
|
|
add_symbol_to_list (sym, &global_symbols);
|
|
SYMBOL_CLASS (sym) = LOC_STATIC;
|
|
SYMBOL_VALUE (sym) += baseaddr;
|
|
}
|
|
break;
|
|
case TAG_local_variable:
|
|
if (dip -> at_location != NULL)
|
|
{
|
|
SYMBOL_VALUE (sym) = locval (dip -> at_location);
|
|
add_symbol_to_list (sym, list_in_scope);
|
|
if (isreg)
|
|
{
|
|
SYMBOL_CLASS (sym) = LOC_REGISTER;
|
|
}
|
|
else if (offreg)
|
|
{
|
|
SYMBOL_CLASS (sym) = LOC_LOCAL;
|
|
}
|
|
else
|
|
{
|
|
SYMBOL_CLASS (sym) = LOC_STATIC;
|
|
SYMBOL_VALUE (sym) += baseaddr;
|
|
}
|
|
}
|
|
break;
|
|
case TAG_formal_parameter:
|
|
if (dip -> at_location != NULL)
|
|
{
|
|
SYMBOL_VALUE (sym) = locval (dip -> at_location);
|
|
}
|
|
add_symbol_to_list (sym, list_in_scope);
|
|
if (isreg)
|
|
{
|
|
SYMBOL_CLASS (sym) = LOC_REGPARM;
|
|
}
|
|
else
|
|
{
|
|
SYMBOL_CLASS (sym) = LOC_ARG;
|
|
}
|
|
break;
|
|
case TAG_unspecified_parameters:
|
|
/* From varargs functions; gdb doesn't seem to have any interest in
|
|
this information, so just ignore it for now. (FIXME?) */
|
|
break;
|
|
case TAG_structure_type:
|
|
case TAG_union_type:
|
|
case TAG_enumeration_type:
|
|
SYMBOL_CLASS (sym) = LOC_TYPEDEF;
|
|
SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE;
|
|
add_symbol_to_list (sym, list_in_scope);
|
|
break;
|
|
case TAG_typedef:
|
|
SYMBOL_CLASS (sym) = LOC_TYPEDEF;
|
|
SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
|
|
add_symbol_to_list (sym, list_in_scope);
|
|
break;
|
|
default:
|
|
/* Not a tag we recognize. Hopefully we aren't processing trash
|
|
data, but since we must specifically ignore things we don't
|
|
recognize, there is nothing else we should do at this point. */
|
|
break;
|
|
}
|
|
}
|
|
return (sym);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_mod_fund_type -- decode a modified fundamental type
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *decode_mod_fund_type (char *typedata)
|
|
|
|
DESCRIPTION
|
|
|
|
Decode a block of data containing a modified fundamental
|
|
type specification. TYPEDATA is a pointer to the block,
|
|
which consists of a two byte length, containing the size
|
|
of the rest of the block. At the end of the block is a
|
|
two byte value that gives the fundamental type. Everything
|
|
in between are type modifiers.
|
|
|
|
We simply compute the number of modifiers and call the general
|
|
function decode_modified_type to do the actual work.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_mod_fund_type, (typedata), char *typedata)
|
|
{
|
|
struct type *typep = NULL;
|
|
unsigned short modcount;
|
|
unsigned char *modifiers;
|
|
|
|
/* Get the total size of the block, exclusive of the size itself */
|
|
(void) memcpy (&modcount, typedata, sizeof (short));
|
|
/* Deduct the size of the fundamental type bytes at the end of the block. */
|
|
modcount -= sizeof (short);
|
|
/* Skip over the two size bytes at the beginning of the block. */
|
|
modifiers = (unsigned char *) typedata + sizeof (short);
|
|
/* Now do the actual decoding */
|
|
typep = decode_modified_type (modifiers, modcount, AT_mod_fund_type);
|
|
return (typep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_mod_u_d_type -- decode a modified user defined type
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *decode_mod_u_d_type (char *typedata)
|
|
|
|
DESCRIPTION
|
|
|
|
Decode a block of data containing a modified user defined
|
|
type specification. TYPEDATA is a pointer to the block,
|
|
which consists of a two byte length, containing the size
|
|
of the rest of the block. At the end of the block is a
|
|
four byte value that gives a reference to a user defined type.
|
|
Everything in between are type modifiers.
|
|
|
|
We simply compute the number of modifiers and call the general
|
|
function decode_modified_type to do the actual work.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_mod_u_d_type, (typedata), char *typedata)
|
|
{
|
|
struct type *typep = NULL;
|
|
unsigned short modcount;
|
|
unsigned char *modifiers;
|
|
|
|
/* Get the total size of the block, exclusive of the size itself */
|
|
(void) memcpy (&modcount, typedata, sizeof (short));
|
|
/* Deduct the size of the reference type bytes at the end of the block. */
|
|
modcount -= sizeof (long);
|
|
/* Skip over the two size bytes at the beginning of the block. */
|
|
modifiers = (unsigned char *) typedata + sizeof (short);
|
|
/* Now do the actual decoding */
|
|
typep = decode_modified_type (modifiers, modcount, AT_mod_u_d_type);
|
|
return (typep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_modified_type -- decode modified user or fundamental type
|
|
|
|
SYNOPSIS
|
|
|
|
static struct type *decode_modified_type (unsigned char *modifiers,
|
|
unsigned short modcount, int mtype)
|
|
|
|
DESCRIPTION
|
|
|
|
Decode a modified type, either a modified fundamental type or
|
|
a modified user defined type. MODIFIERS is a pointer to the
|
|
block of bytes that define MODCOUNT modifiers. Immediately
|
|
following the last modifier is a short containing the fundamental
|
|
type or a long containing the reference to the user defined
|
|
type. Which one is determined by MTYPE, which is either
|
|
AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
|
|
type we are generating.
|
|
|
|
We call ourself recursively to generate each modified type,`
|
|
until MODCOUNT reaches zero, at which point we have consumed
|
|
all the modifiers and generate either the fundamental type or
|
|
user defined type. When the recursion unwinds, each modifier
|
|
is applied in turn to generate the full modified type.
|
|
|
|
NOTES
|
|
|
|
If we find a modifier that we don't recognize, and it is not one
|
|
of those reserved for application specific use, then we issue a
|
|
warning and simply ignore the modifier.
|
|
|
|
BUGS
|
|
|
|
We currently ignore MOD_const and MOD_volatile. (FIXME)
|
|
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_modified_type,
|
|
(modifiers, modcount, mtype),
|
|
unsigned char *modifiers AND unsigned short modcount AND int mtype)
|
|
{
|
|
struct type *typep = NULL;
|
|
unsigned short fundtype;
|
|
DIEREF dieref;
|
|
unsigned char modifier;
|
|
|
|
if (modcount == 0)
|
|
{
|
|
switch (mtype)
|
|
{
|
|
case AT_mod_fund_type:
|
|
(void) memcpy (&fundtype, modifiers, sizeof (short));
|
|
typep = decode_fund_type (fundtype);
|
|
break;
|
|
case AT_mod_u_d_type:
|
|
(void) memcpy (&dieref, modifiers, sizeof (DIEREF));
|
|
if ((typep = lookup_utype (dieref)) == NULL)
|
|
{
|
|
typep = alloc_utype (dieref, NULL);
|
|
}
|
|
break;
|
|
default:
|
|
SQUAWK (("botched modified type decoding (mtype 0x%x)", mtype));
|
|
typep = builtin_type_int;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
modifier = *modifiers++;
|
|
typep = decode_modified_type (modifiers, --modcount, mtype);
|
|
switch (modifier)
|
|
{
|
|
case MOD_pointer_to:
|
|
typep = lookup_pointer_type (typep);
|
|
break;
|
|
case MOD_reference_to:
|
|
typep = lookup_reference_type (typep);
|
|
break;
|
|
case MOD_const:
|
|
SQUAWK (("type modifier 'const' ignored")); /* FIXME */
|
|
break;
|
|
case MOD_volatile:
|
|
SQUAWK (("type modifier 'volatile' ignored")); /* FIXME */
|
|
break;
|
|
default:
|
|
if (!(MOD_lo_user <= modifier && modifier <= MOD_hi_user))
|
|
{
|
|
SQUAWK (("unknown type modifier %u", modifier));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
return (typep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
decode_fund_type -- translate basic DWARF type to gdb base type
|
|
|
|
DESCRIPTION
|
|
|
|
Given an integer that is one of the fundamental DWARF types,
|
|
translate it to one of the basic internal gdb types and return
|
|
a pointer to the appropriate gdb type (a "struct type *").
|
|
|
|
NOTES
|
|
|
|
If we encounter a fundamental type that we are unprepared to
|
|
deal with, and it is not in the range of those types defined
|
|
as application specific types, then we issue a warning and
|
|
treat the type as builtin_type_int.
|
|
*/
|
|
|
|
static struct type *
|
|
DEFUN(decode_fund_type, (fundtype), unsigned short fundtype)
|
|
{
|
|
struct type *typep = NULL;
|
|
|
|
switch (fundtype)
|
|
{
|
|
|
|
case FT_void:
|
|
typep = builtin_type_void;
|
|
break;
|
|
|
|
case FT_pointer: /* (void *) */
|
|
typep = lookup_pointer_type (builtin_type_void);
|
|
break;
|
|
|
|
case FT_char:
|
|
case FT_signed_char:
|
|
typep = builtin_type_char;
|
|
break;
|
|
|
|
case FT_short:
|
|
case FT_signed_short:
|
|
typep = builtin_type_short;
|
|
break;
|
|
|
|
case FT_integer:
|
|
case FT_signed_integer:
|
|
case FT_boolean: /* Was FT_set in AT&T version */
|
|
typep = builtin_type_int;
|
|
break;
|
|
|
|
case FT_long:
|
|
case FT_signed_long:
|
|
typep = builtin_type_long;
|
|
break;
|
|
|
|
case FT_float:
|
|
typep = builtin_type_float;
|
|
break;
|
|
|
|
case FT_dbl_prec_float:
|
|
typep = builtin_type_double;
|
|
break;
|
|
|
|
case FT_unsigned_char:
|
|
typep = builtin_type_unsigned_char;
|
|
break;
|
|
|
|
case FT_unsigned_short:
|
|
typep = builtin_type_unsigned_short;
|
|
break;
|
|
|
|
case FT_unsigned_integer:
|
|
typep = builtin_type_unsigned_int;
|
|
break;
|
|
|
|
case FT_unsigned_long:
|
|
typep = builtin_type_unsigned_long;
|
|
break;
|
|
|
|
case FT_ext_prec_float:
|
|
typep = builtin_type_long_double;
|
|
break;
|
|
|
|
case FT_complex:
|
|
typep = builtin_type_complex;
|
|
break;
|
|
|
|
case FT_dbl_prec_complex:
|
|
typep = builtin_type_double_complex;
|
|
break;
|
|
|
|
case FT_long_long:
|
|
case FT_signed_long_long:
|
|
typep = builtin_type_long_long;
|
|
break;
|
|
|
|
case FT_unsigned_long_long:
|
|
typep = builtin_type_unsigned_long_long;
|
|
break;
|
|
|
|
}
|
|
|
|
if ((typep == NULL) && !(FT_lo_user <= fundtype && fundtype <= FT_hi_user))
|
|
{
|
|
SQUAWK (("unexpected fundamental type 0x%x", fundtype));
|
|
typep = builtin_type_void;
|
|
}
|
|
|
|
return (typep);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
create_name -- allocate a fresh copy of a string on an obstack
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to a string and a pointer to an obstack, allocates
|
|
a fresh copy of the string on the specified obstack.
|
|
|
|
*/
|
|
|
|
static char *
|
|
DEFUN(create_name, (name, obstackp), char *name AND struct obstack *obstackp)
|
|
{
|
|
int length;
|
|
char *newname;
|
|
|
|
length = strlen (name) + 1;
|
|
newname = (char *) obstack_alloc (obstackp, length);
|
|
(void) strcpy (newname, name);
|
|
return (newname);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
basicdieinfo -- extract the minimal die info from raw die data
|
|
|
|
SYNOPSIS
|
|
|
|
void basicdieinfo (char *diep, struct dieinfo *dip)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to raw DIE data, and a pointer to an instance of a
|
|
die info structure, this function extracts the basic information
|
|
from the DIE data required to continue processing this DIE, along
|
|
with some bookkeeping information about the DIE.
|
|
|
|
The information we absolutely must have includes the DIE tag,
|
|
and the DIE length. If we need the sibling reference, then we
|
|
will have to call completedieinfo() to process all the remaining
|
|
DIE information.
|
|
|
|
Note that since there is no guarantee that the data is properly
|
|
aligned in memory for the type of access required (indirection
|
|
through anything other than a char pointer), we use memcpy to
|
|
shuffle data items larger than a char. Possibly inefficient, but
|
|
quite portable.
|
|
|
|
We also take care of some other basic things at this point, such
|
|
as ensuring that the instance of the die info structure starts
|
|
out completely zero'd and that curdie is initialized for use
|
|
in error reporting if we have a problem with the current die.
|
|
|
|
NOTES
|
|
|
|
All DIE's must have at least a valid length, thus the minimum
|
|
DIE size is sizeof (long). In order to have a valid tag, the
|
|
DIE size must be at least sizeof (short) larger, otherwise they
|
|
are forced to be TAG_padding DIES.
|
|
|
|
Padding DIES must be at least sizeof(long) in length, implying that
|
|
if a padding DIE is used for alignment and the amount needed is less
|
|
than sizeof(long) then the padding DIE has to be big enough to align
|
|
to the next alignment boundry.
|
|
*/
|
|
|
|
static void
|
|
DEFUN(basicdieinfo, (dip, diep), struct dieinfo *dip AND char *diep)
|
|
{
|
|
curdie = dip;
|
|
(void) memset (dip, 0, sizeof (struct dieinfo));
|
|
dip -> die = diep;
|
|
dip -> dieref = dbroff + (diep - dbbase);
|
|
(void) memcpy (&dip -> dielength, diep, sizeof (long));
|
|
if (dip -> dielength < sizeof (long))
|
|
{
|
|
dwarfwarn ("malformed DIE, bad length (%d bytes)", dip -> dielength);
|
|
}
|
|
else if (dip -> dielength < (sizeof (long) + sizeof (short)))
|
|
{
|
|
dip -> dietag = TAG_padding;
|
|
}
|
|
else
|
|
{
|
|
(void) memcpy (&dip -> dietag, diep + sizeof (long), sizeof (short));
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
completedieinfo -- finish reading the information for a given DIE
|
|
|
|
SYNOPSIS
|
|
|
|
void completedieinfo (struct dieinfo *dip)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to an already partially initialized die info structure,
|
|
scan the raw DIE data and finish filling in the die info structure
|
|
from the various attributes found.
|
|
|
|
Note that since there is no guarantee that the data is properly
|
|
aligned in memory for the type of access required (indirection
|
|
through anything other than a char pointer), we use memcpy to
|
|
shuffle data items larger than a char. Possibly inefficient, but
|
|
quite portable.
|
|
|
|
NOTES
|
|
|
|
Each time we are called, we increment the diecount variable, which
|
|
keeps an approximate count of the number of dies processed for
|
|
each compilation unit. This information is presented to the user
|
|
if the info_verbose flag is set.
|
|
|
|
*/
|
|
|
|
static void
|
|
DEFUN(completedieinfo, (dip), struct dieinfo *dip)
|
|
{
|
|
char *diep; /* Current pointer into raw DIE data */
|
|
char *end; /* Terminate DIE scan here */
|
|
unsigned short attr; /* Current attribute being scanned */
|
|
unsigned short form; /* Form of the attribute */
|
|
short block2sz; /* Size of a block2 attribute field */
|
|
long block4sz; /* Size of a block4 attribute field */
|
|
|
|
diecount++;
|
|
diep = dip -> die;
|
|
end = diep + dip -> dielength;
|
|
diep += sizeof (long) + sizeof (short);
|
|
while (diep < end)
|
|
{
|
|
(void) memcpy (&attr, diep, sizeof (short));
|
|
diep += sizeof (short);
|
|
switch (attr)
|
|
{
|
|
case AT_fund_type:
|
|
(void) memcpy (&dip -> at_fund_type, diep, sizeof (short));
|
|
break;
|
|
case AT_ordering:
|
|
(void) memcpy (&dip -> at_ordering, diep, sizeof (short));
|
|
break;
|
|
case AT_bit_offset:
|
|
(void) memcpy (&dip -> at_bit_offset, diep, sizeof (short));
|
|
break;
|
|
case AT_visibility:
|
|
(void) memcpy (&dip -> at_visibility, diep, sizeof (short));
|
|
break;
|
|
case AT_sibling:
|
|
(void) memcpy (&dip -> at_sibling, diep, sizeof (long));
|
|
break;
|
|
case AT_stmt_list:
|
|
(void) memcpy (&dip -> at_stmt_list, diep, sizeof (long));
|
|
dip -> has_at_stmt_list = 1;
|
|
break;
|
|
case AT_low_pc:
|
|
(void) memcpy (&dip -> at_low_pc, diep, sizeof (long));
|
|
dip -> at_low_pc += baseaddr;
|
|
dip -> has_at_low_pc = 1;
|
|
break;
|
|
case AT_high_pc:
|
|
(void) memcpy (&dip -> at_high_pc, diep, sizeof (long));
|
|
dip -> at_high_pc += baseaddr;
|
|
break;
|
|
case AT_language:
|
|
(void) memcpy (&dip -> at_language, diep, sizeof (long));
|
|
break;
|
|
case AT_user_def_type:
|
|
(void) memcpy (&dip -> at_user_def_type, diep, sizeof (long));
|
|
break;
|
|
case AT_byte_size:
|
|
(void) memcpy (&dip -> at_byte_size, diep, sizeof (long));
|
|
break;
|
|
case AT_bit_size:
|
|
(void) memcpy (&dip -> at_bit_size, diep, sizeof (long));
|
|
break;
|
|
case AT_member:
|
|
(void) memcpy (&dip -> at_member, diep, sizeof (long));
|
|
break;
|
|
case AT_discr:
|
|
(void) memcpy (&dip -> at_discr, diep, sizeof (long));
|
|
break;
|
|
case AT_import:
|
|
(void) memcpy (&dip -> at_import, diep, sizeof (long));
|
|
break;
|
|
case AT_location:
|
|
dip -> at_location = diep;
|
|
break;
|
|
case AT_mod_fund_type:
|
|
dip -> at_mod_fund_type = diep;
|
|
break;
|
|
case AT_subscr_data:
|
|
dip -> at_subscr_data = diep;
|
|
break;
|
|
case AT_mod_u_d_type:
|
|
dip -> at_mod_u_d_type = diep;
|
|
break;
|
|
case AT_element_list:
|
|
dip -> at_element_list = diep;
|
|
dip -> short_element_list = 0;
|
|
break;
|
|
case AT_short_element_list:
|
|
dip -> at_element_list = diep;
|
|
dip -> short_element_list = 1;
|
|
break;
|
|
case AT_discr_value:
|
|
dip -> at_discr_value = diep;
|
|
break;
|
|
case AT_string_length:
|
|
dip -> at_string_length = diep;
|
|
break;
|
|
case AT_name:
|
|
dip -> at_name = diep;
|
|
break;
|
|
case AT_comp_dir:
|
|
dip -> at_comp_dir = diep;
|
|
break;
|
|
case AT_producer:
|
|
dip -> at_producer = diep;
|
|
break;
|
|
case AT_frame_base:
|
|
(void) memcpy (&dip -> at_frame_base, diep, sizeof (long));
|
|
break;
|
|
case AT_start_scope:
|
|
(void) memcpy (&dip -> at_start_scope, diep, sizeof (long));
|
|
break;
|
|
case AT_stride_size:
|
|
(void) memcpy (&dip -> at_stride_size, diep, sizeof (long));
|
|
break;
|
|
case AT_src_info:
|
|
(void) memcpy (&dip -> at_src_info, diep, sizeof (long));
|
|
break;
|
|
case AT_prototyped:
|
|
(void) memcpy (&dip -> at_prototyped, diep, sizeof (short));
|
|
break;
|
|
default:
|
|
/* Found an attribute that we are unprepared to handle. However
|
|
it is specifically one of the design goals of DWARF that
|
|
consumers should ignore unknown attributes. As long as the
|
|
form is one that we recognize (so we know how to skip it),
|
|
we can just ignore the unknown attribute. */
|
|
break;
|
|
}
|
|
form = attr & 0xF;
|
|
switch (form)
|
|
{
|
|
case FORM_DATA2:
|
|
diep += sizeof (short);
|
|
break;
|
|
case FORM_DATA4:
|
|
diep += sizeof (long);
|
|
break;
|
|
case FORM_DATA8:
|
|
diep += 8 * sizeof (char); /* sizeof (long long) ? */
|
|
break;
|
|
case FORM_ADDR:
|
|
case FORM_REF:
|
|
diep += sizeof (long);
|
|
break;
|
|
case FORM_BLOCK2:
|
|
(void) memcpy (&block2sz, diep, sizeof (short));
|
|
block2sz += sizeof (short);
|
|
diep += block2sz;
|
|
break;
|
|
case FORM_BLOCK4:
|
|
(void) memcpy (&block4sz, diep, sizeof (long));
|
|
block4sz += sizeof (long);
|
|
diep += block4sz;
|
|
break;
|
|
case FORM_STRING:
|
|
diep += strlen (diep) + 1;
|
|
break;
|
|
default:
|
|
SQUAWK (("unknown attribute form (0x%x), skipped rest", form));
|
|
diep = end;
|
|
break;
|
|
}
|
|
}
|
|
}
|