| /* DWARF debugging format support for GDB. |
| Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998 |
| Free Software Foundation, Inc. |
| Written by Fred Fish at Cygnus Support. Portions based on dbxread.c, |
| mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| /* |
| |
| FIXME: Do we need to generate dependencies in partial symtabs? |
| (Perhaps we don't need to). |
| |
| FIXME: Resolve minor differences between what information we put in the |
| partial symbol table and what dbxread puts in. For example, we don't yet |
| put enum constants there. And dbxread seems to invent a lot of typedefs |
| we never see. Use the new printpsym command to see the partial symbol table |
| contents. |
| |
| FIXME: Figure out a better way to tell gdb about the name of the function |
| contain the user's entry point (I.E. main()) |
| |
| FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for |
| other things to work on, if you get bored. :-) |
| |
| */ |
| |
| #include "defs.h" |
| #include "symtab.h" |
| #include "gdbtypes.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "elf/dwarf.h" |
| #include "buildsym.h" |
| #include "demangle.h" |
| #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */ |
| #include "language.h" |
| #include "complaints.h" |
| |
| #include <fcntl.h> |
| #include "gdb_string.h" |
| |
| /* Some macros to provide DIE info for complaints. */ |
| |
| #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0) |
| #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : "" |
| |
| /* Complaints that can be issued during DWARF debug info reading. */ |
| |
| struct complaint no_bfd_get_N = |
| { |
| "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0 |
| }; |
| |
| struct complaint malformed_die = |
| { |
| "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0 |
| }; |
| |
| struct complaint bad_die_ref = |
| { |
| "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0 |
| }; |
| |
| struct complaint unknown_attribute_form = |
| { |
| "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0 |
| }; |
| |
| struct complaint unknown_attribute_length = |
| { |
| "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0 |
| }; |
| |
| struct complaint unexpected_fund_type = |
| { |
| "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0 |
| }; |
| |
| struct complaint unknown_type_modifier = |
| { |
| "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0 |
| }; |
| |
| struct complaint volatile_ignored = |
| { |
| "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0 |
| }; |
| |
| struct complaint const_ignored = |
| { |
| "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0 |
| }; |
| |
| struct complaint botched_modified_type = |
| { |
| "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0 |
| }; |
| |
| struct complaint op_deref2 = |
| { |
| "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0 |
| }; |
| |
| struct complaint op_deref4 = |
| { |
| "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0 |
| }; |
| |
| struct complaint basereg_not_handled = |
| { |
| "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0 |
| }; |
| |
| struct complaint dup_user_type_allocation = |
| { |
| "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0 |
| }; |
| |
| struct complaint dup_user_type_definition = |
| { |
| "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0 |
| }; |
| |
| struct complaint missing_tag = |
| { |
| "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0 |
| }; |
| |
| struct complaint bad_array_element_type = |
| { |
| "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0 |
| }; |
| |
| struct complaint subscript_data_items = |
| { |
| "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0 |
| }; |
| |
| struct complaint unhandled_array_subscript_format = |
| { |
| "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0 |
| }; |
| |
| struct complaint unknown_array_subscript_format = |
| { |
| "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0 |
| }; |
| |
| struct complaint not_row_major = |
| { |
| "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0 |
| }; |
| |
| struct complaint missing_at_name = |
| { |
| "DIE @ 0x%x, AT_name tag missing", 0, 0 |
| }; |
| |
| typedef unsigned int DIE_REF; /* Reference to a DIE */ |
| |
| #ifndef GCC_PRODUCER |
| #define GCC_PRODUCER "GNU C " |
| #endif |
| |
| #ifndef GPLUS_PRODUCER |
| #define GPLUS_PRODUCER "GNU C++ " |
| #endif |
| |
| #ifndef LCC_PRODUCER |
| #define LCC_PRODUCER "NCR C/C++" |
| #endif |
| |
| #ifndef CHILL_PRODUCER |
| #define CHILL_PRODUCER "GNU Chill " |
| #endif |
| |
| /* Provide a default mapping from a DWARF register number to a gdb REGNUM. */ |
| #ifndef DWARF_REG_TO_REGNUM |
| #define DWARF_REG_TO_REGNUM(num) (num) |
| #endif |
| |
| /* Flags to target_to_host() that tell whether or not the data object is |
| expected to be signed. Used, for example, when fetching a signed |
| integer in the target environment which is used as a signed integer |
| in the host environment, and the two environments have different sized |
| ints. In this case, *somebody* has to sign extend the smaller sized |
| int. */ |
| |
| #define GET_UNSIGNED 0 /* No sign extension required */ |
| #define GET_SIGNED 1 /* Sign extension required */ |
| |
| /* Defines for things which are specified in the document "DWARF Debugging |
| Information Format" published by UNIX International, Programming Languages |
| SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */ |
| |
| #define SIZEOF_DIE_LENGTH 4 |
| #define SIZEOF_DIE_TAG 2 |
| #define SIZEOF_ATTRIBUTE 2 |
| #define SIZEOF_FORMAT_SPECIFIER 1 |
| #define SIZEOF_FMT_FT 2 |
| #define SIZEOF_LINETBL_LENGTH 4 |
| #define SIZEOF_LINETBL_LINENO 4 |
| #define SIZEOF_LINETBL_STMT 2 |
| #define SIZEOF_LINETBL_DELTA 4 |
| #define SIZEOF_LOC_ATOM_CODE 1 |
| |
| #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */ |
| |
| /* Macros that return the sizes of various types of data in the target |
| environment. |
| |
| FIXME: Currently these are just compile time constants (as they are in |
| other parts of gdb as well). They need to be able to get the right size |
| either from the bfd or possibly from the DWARF info. It would be nice if |
| the DWARF producer inserted DIES that describe the fundamental types in |
| the target environment into the DWARF info, similar to the way dbx stabs |
| producers produce information about their fundamental types. */ |
| |
| #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT) |
| #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT) |
| |
| /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a |
| FORM_BLOCK2, and this is the value emitted by the AT&T compiler. |
| However, the Issue 2 DWARF specification from AT&T defines it as |
| a FORM_BLOCK4, as does the latest specification from UI/PLSIG. |
| For backwards compatibility with the AT&T compiler produced executables |
| we define AT_short_element_list for this variant. */ |
| |
| #define AT_short_element_list (0x00f0|FORM_BLOCK2) |
| |
| /* External variables referenced. */ |
| |
| extern int info_verbose; /* From main.c; nonzero => verbose */ |
| extern char *warning_pre_print; /* From utils.c */ |
| |
| /* The DWARF debugging information consists of two major pieces, |
| one is a block of DWARF Information Entries (DIE's) and the other |
| is a line number table. The "struct dieinfo" structure contains |
| the information for a single DIE, the one currently being processed. |
| |
| In order to make it easier to randomly access the attribute fields |
| of the current DIE, which are specifically unordered within the DIE, |
| each DIE is scanned and an instance of the "struct dieinfo" |
| structure is initialized. |
| |
| Initialization is done in two levels. The first, done by basicdieinfo(), |
| just initializes those fields that are vital to deciding whether or not |
| to use this DIE, how to skip past it, etc. The second, done by the |
| function completedieinfo(), fills in the rest of the information. |
| |
| Attributes which have block forms are not interpreted at the time |
| the DIE is scanned, instead we just save pointers to the start |
| of their value fields. |
| |
| Some fields have a flag <name>_p that is set when the value of the |
| field is valid (I.E. we found a matching attribute in the DIE). Since |
| we may want to test for the presence of some attributes in the DIE, |
| such as AT_low_pc, without restricting the values of the field, |
| we need someway to note that we found such an attribute. |
| |
| */ |
| |
| typedef char BLOCK; |
| |
| struct dieinfo |
| { |
| char *die; /* Pointer to the raw DIE data */ |
| unsigned long die_length; /* Length of the raw DIE data */ |
| DIE_REF die_ref; /* Offset of this DIE */ |
| unsigned short die_tag; /* Tag for this DIE */ |
| unsigned long at_padding; |
| unsigned long at_sibling; |
| BLOCK *at_location; |
| char *at_name; |
| unsigned short at_fund_type; |
| BLOCK *at_mod_fund_type; |
| unsigned long at_user_def_type; |
| BLOCK *at_mod_u_d_type; |
| unsigned short at_ordering; |
| BLOCK *at_subscr_data; |
| unsigned long at_byte_size; |
| unsigned short at_bit_offset; |
| unsigned long at_bit_size; |
| BLOCK *at_element_list; |
| unsigned long at_stmt_list; |
| CORE_ADDR at_low_pc; |
| CORE_ADDR at_high_pc; |
| unsigned long at_language; |
| unsigned long at_member; |
| unsigned long at_discr; |
| BLOCK *at_discr_value; |
| BLOCK *at_string_length; |
| char *at_comp_dir; |
| char *at_producer; |
| unsigned long at_start_scope; |
| unsigned long at_stride_size; |
| unsigned long at_src_info; |
| char *at_prototyped; |
| unsigned int has_at_low_pc:1; |
| unsigned int has_at_stmt_list:1; |
| unsigned int has_at_byte_size:1; |
| unsigned int short_element_list:1; |
| |
| /* Kludge to identify register variables */ |
| |
| unsigned int isreg; |
| |
| /* Kludge to identify optimized out variables */ |
| |
| unsigned int optimized_out; |
| |
| /* Kludge to identify basereg references. |
| Nonzero if we have an offset relative to a basereg. */ |
| |
| unsigned int offreg; |
| |
| /* Kludge to identify which base register is it relative to. */ |
| |
| unsigned int basereg; |
| }; |
| |
| static int diecount; /* Approximate count of dies for compilation unit */ |
| static struct dieinfo *curdie; /* For warnings and such */ |
| |
| static char *dbbase; /* Base pointer to dwarf info */ |
| static int dbsize; /* Size of dwarf info in bytes */ |
| static int dbroff; /* Relative offset from start of .debug section */ |
| static char *lnbase; /* Base pointer to line section */ |
| |
| /* This value is added to each symbol value. FIXME: Generalize to |
| the section_offsets structure used by dbxread (once this is done, |
| pass the appropriate section number to end_symtab). */ |
| static CORE_ADDR baseaddr; /* Add to each symbol value */ |
| |
| /* The section offsets used in the current psymtab or symtab. FIXME, |
| only used to pass one value (baseaddr) at the moment. */ |
| static struct section_offsets *base_section_offsets; |
| |
| /* We put a pointer to this structure in the read_symtab_private field |
| of the psymtab. */ |
| |
| struct dwfinfo |
| { |
| /* Always the absolute file offset to the start of the ".debug" |
| section for the file containing the DIE's being accessed. */ |
| file_ptr dbfoff; |
| /* Relative offset from the start of the ".debug" section to the |
| first DIE to be accessed. When building the partial symbol |
| table, this value will be zero since we are accessing the |
| entire ".debug" section. When expanding a partial symbol |
| table entry, this value will be the offset to the first |
| DIE for the compilation unit containing the symbol that |
| triggers the expansion. */ |
| int dbroff; |
| /* The size of the chunk of DIE's being examined, in bytes. */ |
| int dblength; |
| /* The absolute file offset to the line table fragment. Ignored |
| when building partial symbol tables, but used when expanding |
| them, and contains the absolute file offset to the fragment |
| of the ".line" section containing the line numbers for the |
| current compilation unit. */ |
| file_ptr lnfoff; |
| }; |
| |
| #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff) |
| #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff) |
| #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength) |
| #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff) |
| |
| /* The generic symbol table building routines have separate lists for |
| file scope symbols and all all other scopes (local scopes). So |
| we need to select the right one to pass to add_symbol_to_list(). |
| We do it by keeping a pointer to the correct list in list_in_scope. |
| |
| FIXME: The original dwarf code just treated the file scope as the first |
| local scope, and all other local scopes as nested local scopes, and worked |
| fine. Check to see if we really need to distinguish these in buildsym.c */ |
| |
| struct pending **list_in_scope = &file_symbols; |
| |
| /* DIES which have user defined types or modified user defined types refer to |
| other DIES for the type information. Thus we need to associate the offset |
| of a DIE for a user defined type with a pointer to the type information. |
| |
| Originally this was done using a simple but expensive algorithm, with an |
| array of unsorted structures, each containing an offset/type-pointer pair. |
| This array was scanned linearly each time a lookup was done. The result |
| was that gdb was spending over half it's startup time munging through this |
| array of pointers looking for a structure that had the right offset member. |
| |
| The second attempt used the same array of structures, but the array was |
| sorted using qsort each time a new offset/type was recorded, and a binary |
| search was used to find the type pointer for a given DIE offset. This was |
| even slower, due to the overhead of sorting the array each time a new |
| offset/type pair was entered. |
| |
| The third attempt uses a fixed size array of type pointers, indexed by a |
| value derived from the DIE offset. Since the minimum DIE size is 4 bytes, |
| we can divide any DIE offset by 4 to obtain a unique index into this fixed |
| size array. Since each element is a 4 byte pointer, it takes exactly as |
| much memory to hold this array as to hold the DWARF info for a given |
| compilation unit. But it gets freed as soon as we are done with it. |
| This has worked well in practice, as a reasonable tradeoff between memory |
| consumption and speed, without having to resort to much more complicated |
| algorithms. */ |
| |
| static struct type **utypes; /* Pointer to array of user type pointers */ |
| static int numutypes; /* Max number of user type pointers */ |
| |
| /* Maintain an array of referenced fundamental types for the current |
| compilation unit being read. For DWARF version 1, we have to construct |
| the fundamental types on the fly, since no information about the |
| fundamental types is supplied. Each such fundamental type is created by |
| calling a language dependent routine to create the type, and then a |
| pointer to that type is then placed in the array at the index specified |
| by it's FT_<TYPENAME> value. The array has a fixed size set by the |
| FT_NUM_MEMBERS compile time constant, which is the number of predefined |
| fundamental types gdb knows how to construct. */ |
| |
| static struct type *ftypes[FT_NUM_MEMBERS]; /* Fundamental types */ |
| |
| /* Record the language for the compilation unit which is currently being |
| processed. We know it once we have seen the TAG_compile_unit DIE, |
| and we need it while processing the DIE's for that compilation unit. |
| It is eventually saved in the symtab structure, but we don't finalize |
| the symtab struct until we have processed all the DIE's for the |
| compilation unit. We also need to get and save a pointer to the |
| language struct for this language, so we can call the language |
| dependent routines for doing things such as creating fundamental |
| types. */ |
| |
| static enum language cu_language; |
| static const struct language_defn *cu_language_defn; |
| |
| /* Forward declarations of static functions so we don't have to worry |
| about ordering within this file. */ |
| |
| static void |
| free_utypes PARAMS ((PTR)); |
| |
| static int |
| attribute_size PARAMS ((unsigned int)); |
| |
| static CORE_ADDR |
| target_to_host PARAMS ((char *, int, int, struct objfile *)); |
| |
| static void |
| add_enum_psymbol PARAMS ((struct dieinfo *, struct objfile *)); |
| |
| static void |
| handle_producer PARAMS ((char *)); |
| |
| static void |
| read_file_scope PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
| |
| static void |
| read_func_scope PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
| |
| static void |
| read_lexical_block_scope PARAMS ((struct dieinfo *, char *, char *, |
| struct objfile *)); |
| |
| static void |
| scan_partial_symbols PARAMS ((char *, char *, struct objfile *)); |
| |
| static void |
| scan_compilation_units PARAMS ((char *, char *, file_ptr, |
| file_ptr, struct objfile *)); |
| |
| static void |
| add_partial_symbol PARAMS ((struct dieinfo *, struct objfile *)); |
| |
| static void |
| basicdieinfo PARAMS ((struct dieinfo *, char *, struct objfile *)); |
| |
| static void |
| completedieinfo PARAMS ((struct dieinfo *, struct objfile *)); |
| |
| static void |
| dwarf_psymtab_to_symtab PARAMS ((struct partial_symtab *)); |
| |
| static void |
| psymtab_to_symtab_1 PARAMS ((struct partial_symtab *)); |
| |
| static void |
| read_ofile_symtab PARAMS ((struct partial_symtab *)); |
| |
| static void |
| process_dies PARAMS ((char *, char *, struct objfile *)); |
| |
| static void |
| read_structure_scope PARAMS ((struct dieinfo *, char *, char *, |
| struct objfile *)); |
| |
| static struct type * |
| decode_array_element_type PARAMS ((char *)); |
| |
| static struct type * |
| decode_subscript_data_item PARAMS ((char *, char *)); |
| |
| static void |
| dwarf_read_array_type PARAMS ((struct dieinfo *)); |
| |
| static void |
| read_tag_pointer_type PARAMS ((struct dieinfo * dip)); |
| |
| static void |
| read_tag_string_type PARAMS ((struct dieinfo * dip)); |
| |
| static void |
| read_subroutine_type PARAMS ((struct dieinfo *, char *, char *)); |
| |
| static void |
| read_enumeration PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
| |
| static struct type * |
| struct_type PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
| |
| static struct type * |
| enum_type PARAMS ((struct dieinfo *, struct objfile *)); |
| |
| static void |
| decode_line_numbers PARAMS ((char *)); |
| |
| static struct type * |
| decode_die_type PARAMS ((struct dieinfo *)); |
| |
| static struct type * |
| decode_mod_fund_type PARAMS ((char *)); |
| |
| static struct type * |
| decode_mod_u_d_type PARAMS ((char *)); |
| |
| static struct type * |
| decode_modified_type PARAMS ((char *, unsigned int, int)); |
| |
| static struct type * |
| decode_fund_type PARAMS ((unsigned int)); |
| |
| static char * |
| create_name PARAMS ((char *, struct obstack *)); |
| |
| static struct type * |
| lookup_utype PARAMS ((DIE_REF)); |
| |
| static struct type * |
| alloc_utype PARAMS ((DIE_REF, struct type *)); |
| |
| static struct symbol * |
| new_symbol PARAMS ((struct dieinfo *, struct objfile *)); |
| |
| static void |
| synthesize_typedef PARAMS ((struct dieinfo *, struct objfile *, |
| struct type *)); |
| |
| static int |
| locval PARAMS ((struct dieinfo *)); |
| |
| static void |
| set_cu_language PARAMS ((struct dieinfo *)); |
| |
| static struct type * |
| dwarf_fundamental_type PARAMS ((struct objfile *, int)); |
| |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| dwarf_fundamental_type -- lookup or create a fundamental type |
| |
| SYNOPSIS |
| |
| struct type * |
| dwarf_fundamental_type (struct objfile *objfile, int typeid) |
| |
| DESCRIPTION |
| |
| DWARF version 1 doesn't supply any fundamental type information, |
| so gdb has to construct such types. It has a fixed number of |
| fundamental types that it knows how to construct, which is the |
| union of all types that it knows how to construct for all languages |
| that it knows about. These are enumerated in gdbtypes.h. |
| |
| As an example, assume we find a DIE that references a DWARF |
| fundamental type of FT_integer. We first look in the ftypes |
| array to see if we already have such a type, indexed by the |
| gdb internal value of FT_INTEGER. If so, we simply return a |
| pointer to that type. If not, then we ask an appropriate |
| language dependent routine to create a type FT_INTEGER, using |
| defaults reasonable for the current target machine, and install |
| that type in ftypes for future reference. |
| |
| RETURNS |
| |
| Pointer to a fundamental type. |
| |
| */ |
| |
| static struct type * |
| dwarf_fundamental_type (objfile, typeid) |
| struct objfile *objfile; |
| int typeid; |
| { |
| if (typeid < 0 || typeid >= FT_NUM_MEMBERS) |
| { |
| error ("internal error - invalid fundamental type id %d", typeid); |
| } |
| |
| /* Look for this particular type in the fundamental type vector. If one is |
| not found, create and install one appropriate for the current language |
| and the current target machine. */ |
| |
| if (ftypes[typeid] == NULL) |
| { |
| ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid); |
| } |
| |
| return (ftypes[typeid]); |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| set_cu_language -- set local copy of language for compilation unit |
| |
| SYNOPSIS |
| |
| void |
| set_cu_language (struct dieinfo *dip) |
| |
| DESCRIPTION |
| |
| Decode the language attribute for a compilation unit DIE and |
| remember what the language was. We use this at various times |
| when processing DIE's for a given compilation unit. |
| |
| RETURNS |
| |
| No return value. |
| |
| */ |
| |
| static void |
| set_cu_language (dip) |
| struct dieinfo *dip; |
| { |
| switch (dip->at_language) |
| { |
| case LANG_C89: |
| case LANG_C: |
| cu_language = language_c; |
| break; |
| case LANG_C_PLUS_PLUS: |
| cu_language = language_cplus; |
| break; |
| case LANG_CHILL: |
| cu_language = language_chill; |
| break; |
| case LANG_MODULA2: |
| cu_language = language_m2; |
| break; |
| case LANG_FORTRAN77: |
| case LANG_FORTRAN90: |
| cu_language = language_fortran; |
| break; |
| case LANG_ADA83: |
| case LANG_COBOL74: |
| case LANG_COBOL85: |
| case LANG_PASCAL83: |
| /* We don't know anything special about these yet. */ |
| cu_language = language_unknown; |
| break; |
| default: |
| /* If no at_language, try to deduce one from the filename */ |
| cu_language = deduce_language_from_filename (dip->at_name); |
| break; |
| } |
| cu_language_defn = language_def (cu_language); |
| } |
| |
| /* |
| |
| GLOBAL FUNCTION |
| |
| dwarf_build_psymtabs -- build partial symtabs from DWARF debug info |
| |
| SYNOPSIS |
| |
| void dwarf_build_psymtabs (struct objfile *objfile, |
| int mainline, file_ptr dbfoff, unsigned int dbfsize, |
| file_ptr lnoffset, unsigned int lnsize) |
| |
| DESCRIPTION |
| |
| This function is called upon to build partial symtabs from files |
| containing DIE's (Dwarf Information Entries) and DWARF line numbers. |
| |
| It is passed a bfd* containing the DIES |
| and line number information, the corresponding filename for that |
| file, a base address for relocating the symbols, a flag indicating |
| whether or not this debugging information is from a "main symbol |
| table" rather than a shared library or dynamically linked file, |
| and file offset/size pairs for the DIE information and line number |
| information. |
| |
| RETURNS |
| |
| No return value. |
| |
| */ |
| |
| void |
| dwarf_build_psymtabs (objfile, mainline, dbfoff, dbfsize, |
| lnoffset, lnsize) |
| struct objfile *objfile; |
| int mainline; |
| file_ptr dbfoff; |
| unsigned int dbfsize; |
| file_ptr lnoffset; |
| unsigned int lnsize; |
| { |
| bfd *abfd = objfile->obfd; |
| struct cleanup *back_to; |
| |
| current_objfile = objfile; |
| dbsize = dbfsize; |
| dbbase = xmalloc (dbsize); |
| dbroff = 0; |
| if ((bfd_seek (abfd, dbfoff, SEEK_SET) != 0) || |
| (bfd_read (dbbase, dbsize, 1, abfd) != dbsize)) |
| { |
| free (dbbase); |
| error ("can't read DWARF data from '%s'", bfd_get_filename (abfd)); |
| } |
| back_to = make_cleanup (free, dbbase); |
| |
| /* If we are reinitializing, or if we have never loaded syms yet, init. |
| Since we have no idea how many DIES we are looking at, we just guess |
| some arbitrary value. */ |
| |
| if (mainline || objfile->global_psymbols.size == 0 || |
| objfile->static_psymbols.size == 0) |
| { |
| init_psymbol_list (objfile, 1024); |
| } |
| |
| /* Save the relocation factor where everybody can see it. */ |
| |
| base_section_offsets = objfile->section_offsets; |
| baseaddr = ANOFFSET (objfile->section_offsets, 0); |
| |
| /* Follow the compilation unit sibling chain, building a partial symbol |
| table entry for each one. Save enough information about each compilation |
| unit to locate the full DWARF information later. */ |
| |
| scan_compilation_units (dbbase, dbbase + dbsize, dbfoff, lnoffset, objfile); |
| |
| do_cleanups (back_to); |
| current_objfile = NULL; |
| } |
| |
| /* |
| |
| 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 |
| read_lexical_block_scope (dip, thisdie, enddie, objfile) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| register struct context_stack *new; |
| |
| push_context (0, dip->at_low_pc); |
| process_dies (thisdie + dip->die_length, enddie, objfile); |
| new = pop_context (); |
| if (local_symbols != NULL) |
| { |
| finish_block (0, &local_symbols, new->old_blocks, new->start_addr, |
| dip->at_high_pc, objfile); |
| } |
| local_symbols = new->locals; |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| lookup_utype -- look up a user defined type from die reference |
| |
| SYNOPSIS |
| |
| static type *lookup_utype (DIE_REF die_ref) |
| |
| 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 * |
| lookup_utype (die_ref) |
| DIE_REF die_ref; |
| { |
| struct type *type = NULL; |
| int utypeidx; |
| |
| utypeidx = (die_ref - dbroff) / 4; |
| if ((utypeidx < 0) || (utypeidx >= numutypes)) |
| { |
| complain (&bad_die_ref, DIE_ID, DIE_NAME); |
| } |
| else |
| { |
| type = *(utypes + utypeidx); |
| } |
| return (type); |
| } |
| |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| alloc_utype -- add a user defined type for die reference |
| |
| SYNOPSIS |
| |
| static type *alloc_utype (DIE_REF die_ref, struct type *utypep) |
| |
| DESCRIPTION |
| |
| Given a die reference DIE_REF, 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 DIE_REF. |
| */ |
| |
| static struct type * |
| alloc_utype (die_ref, utypep) |
| DIE_REF die_ref; |
| struct type *utypep; |
| { |
| struct type **typep; |
| int utypeidx; |
| |
| utypeidx = (die_ref - dbroff) / 4; |
| typep = utypes + utypeidx; |
| if ((utypeidx < 0) || (utypeidx >= numutypes)) |
| { |
| utypep = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| complain (&bad_die_ref, DIE_ID, DIE_NAME); |
| } |
| else if (*typep != NULL) |
| { |
| utypep = *typep; |
| complain (&dup_user_type_allocation, DIE_ID, DIE_NAME); |
| } |
| else |
| { |
| if (utypep == NULL) |
| { |
| utypep = alloc_type (current_objfile); |
| } |
| *typep = utypep; |
| } |
| return (utypep); |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| free_utypes -- free the utypes array and reset pointer & count |
| |
| SYNOPSIS |
| |
| static void free_utypes (PTR dummy) |
| |
| DESCRIPTION |
| |
| Called via do_cleanups to free the utypes array, reset the pointer to NULL, |
| and set numutypes back to zero. This ensures that the utypes does not get |
| referenced after being freed. |
| */ |
| |
| static void |
| free_utypes (dummy) |
| PTR dummy; |
| { |
| free (utypes); |
| utypes = NULL; |
| numutypes = 0; |
| } |
| |
| |
| /* |
| |
| 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 * |
| 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 = dwarf_fundamental_type (current_objfile, FT_VOID); |
| } |
| 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 * |
| struct_type (dip, thisdie, enddie, objfile) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| 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; |
| struct dieinfo mbr; |
| char *nextdie; |
| int anonymous_size; |
| |
| if ((type = lookup_utype (dip->die_ref)) == NULL) |
| { |
| /* No forward references created an empty type, so install one now */ |
| type = alloc_utype (dip->die_ref, NULL); |
| } |
| INIT_CPLUS_SPECIFIC (type); |
| switch (dip->die_tag) |
| { |
| case TAG_class_type: |
| TYPE_CODE (type) = TYPE_CODE_CLASS; |
| break; |
| case TAG_structure_type: |
| TYPE_CODE (type) = TYPE_CODE_STRUCT; |
| break; |
| case TAG_union_type: |
| TYPE_CODE (type) = TYPE_CODE_UNION; |
| break; |
| default: |
| /* Should never happen */ |
| TYPE_CODE (type) = TYPE_CODE_UNDEF; |
| complain (&missing_tag, DIE_ID, DIE_NAME); |
| 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_TAG_NAME (type) = obconcat (&objfile->type_obstack, |
| "", "", dip->at_name); |
| } |
| /* Use whatever size is known. Zero is a valid size. We might however |
| wish to check has_at_byte_size to make sure that some byte size was |
| given explicitly, but DWARF doesn't specify that explicit sizes of |
| zero have to present, so complaining about missing sizes should |
| probably not be the default. */ |
| TYPE_LENGTH (type) = dip->at_byte_size; |
| thisdie += dip->die_length; |
| while (thisdie < enddie) |
| { |
| basicdieinfo (&mbr, thisdie, objfile); |
| completedieinfo (&mbr, objfile); |
| if (mbr.die_length <= SIZEOF_DIE_LENGTH) |
| { |
| break; |
| } |
| else if (mbr.at_sibling != 0) |
| { |
| nextdie = dbbase + mbr.at_sibling - dbroff; |
| } |
| else |
| { |
| nextdie = thisdie + mbr.die_length; |
| } |
| switch (mbr.die_tag) |
| { |
| 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 = |
| obsavestring (mbr.at_name, strlen (mbr.at_name), |
| &objfile->type_obstack); |
| FIELD_TYPE (list->field) = decode_die_type (&mbr); |
| FIELD_BITPOS (list->field) = 8 * locval (&mbr); |
| /* Handle bit fields. */ |
| FIELD_BITSIZE (list->field) = mbr.at_bit_size; |
| if (BITS_BIG_ENDIAN) |
| { |
| /* For big endian bits, the at_bit_offset gives the |
| additional bit offset from the MSB of the containing |
| anonymous object to the MSB of the field. We don't |
| have to do anything special since we don't need to |
| know the size of the anonymous object. */ |
| FIELD_BITPOS (list->field) += mbr.at_bit_offset; |
| } |
| else |
| { |
| /* For little endian bits, we need to have a non-zero |
| at_bit_size, so that we know we are in fact dealing |
| with a bitfield. Compute the bit offset to the MSB |
| of the anonymous object, subtract off the number of |
| bits from the MSB of the field to the MSB of the |
| object, and then subtract off the number of bits of |
| the field itself. The result is the bit offset of |
| the LSB of the field. */ |
| if (mbr.at_bit_size > 0) |
| { |
| if (mbr.has_at_byte_size) |
| { |
| /* The size of the anonymous object containing |
| the bit field is explicit, so use the |
| indicated size (in bytes). */ |
| anonymous_size = mbr.at_byte_size; |
| } |
| else |
| { |
| /* The size of the anonymous object containing |
| the bit field matches the size of an object |
| of the bit field's type. DWARF allows |
| at_byte_size to be left out in such cases, as |
| a debug information size optimization. */ |
| anonymous_size = TYPE_LENGTH (list->field.type); |
| } |
| FIELD_BITPOS (list->field) += |
| anonymous_size * 8 - mbr.at_bit_offset - mbr.at_bit_size; |
| } |
| } |
| 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 *) |
| TYPE_ALLOC (type, 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 |
| read_structure_scope (dip, thisdie, enddie, objfile) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| struct type *type; |
| struct symbol *sym; |
| |
| type = struct_type (dip, thisdie, enddie, objfile); |
| if (!(TYPE_FLAGS (type) & TYPE_FLAG_STUB)) |
| { |
| sym = new_symbol (dip, objfile); |
| if (sym != NULL) |
| { |
| SYMBOL_TYPE (sym) = type; |
| if (cu_language == language_cplus) |
| { |
| synthesize_typedef (dip, objfile, 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 * |
| decode_array_element_type (scan) |
| char *scan; |
| { |
| struct type *typep; |
| DIE_REF die_ref; |
| unsigned short attribute; |
| unsigned short fundtype; |
| int nbytes; |
| |
| attribute = target_to_host (scan, SIZEOF_ATTRIBUTE, GET_UNSIGNED, |
| current_objfile); |
| scan += SIZEOF_ATTRIBUTE; |
| if ((nbytes = attribute_size (attribute)) == -1) |
| { |
| complain (&bad_array_element_type, DIE_ID, DIE_NAME, attribute); |
| typep = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| } |
| else |
| { |
| switch (attribute) |
| { |
| case AT_fund_type: |
| fundtype = target_to_host (scan, nbytes, GET_UNSIGNED, |
| current_objfile); |
| typep = decode_fund_type (fundtype); |
| break; |
| case AT_mod_fund_type: |
| typep = decode_mod_fund_type (scan); |
| break; |
| case AT_user_def_type: |
| die_ref = target_to_host (scan, nbytes, GET_UNSIGNED, |
| current_objfile); |
| if ((typep = lookup_utype (die_ref)) == NULL) |
| { |
| typep = alloc_utype (die_ref, NULL); |
| } |
| break; |
| case AT_mod_u_d_type: |
| typep = decode_mod_u_d_type (scan); |
| break; |
| default: |
| complain (&bad_array_element_type, DIE_ID, DIE_NAME, attribute); |
| typep = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| break; |
| } |
| } |
| return (typep); |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| decode_subscript_data_item -- decode array subscript item |
| |
| SYNOPSIS |
| |
| static struct type * |
| decode_subscript_data_item (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). |
| |
| The data items describing each array dimension consist of four |
| parts: (1) a format specifier, (2) type type of the subscript |
| index, (3) a description of the low bound of the array dimension, |
| and (4) a description of the high bound of the array dimension. |
| |
| The last data item is the description of the type of each of |
| the array elements. |
| |
| We are passed a pointer to the start of the block of bytes |
| containing the remaining data items, and a pointer to the first |
| byte past the data. This function recursively decodes the |
| remaining data items and returns a type. |
| |
| If we somehow fail to decode some data, we complain about it |
| and return a type "array of int". |
| |
| 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 * |
| decode_subscript_data_item (scan, end) |
| char *scan; |
| char *end; |
| { |
| struct type *typep = NULL; /* Array type we are building */ |
| struct type *nexttype; /* Type of each element (may be array) */ |
| struct type *indextype; /* Type of this index */ |
| struct type *rangetype; |
| unsigned int format; |
| unsigned short fundtype; |
| unsigned long lowbound; |
| unsigned long highbound; |
| int nbytes; |
| |
| format = target_to_host (scan, SIZEOF_FORMAT_SPECIFIER, GET_UNSIGNED, |
| current_objfile); |
| scan += SIZEOF_FORMAT_SPECIFIER; |
| switch (format) |
| { |
| case FMT_ET: |
| typep = decode_array_element_type (scan); |
| break; |
| case FMT_FT_C_C: |
| fundtype = target_to_host (scan, SIZEOF_FMT_FT, GET_UNSIGNED, |
| current_objfile); |
| indextype = decode_fund_type (fundtype); |
| scan += SIZEOF_FMT_FT; |
| nbytes = TARGET_FT_LONG_SIZE (current_objfile); |
| lowbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile); |
| scan += nbytes; |
| highbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile); |
| scan += nbytes; |
| nexttype = decode_subscript_data_item (scan, end); |
| if (nexttype == NULL) |
| { |
| /* Munged subscript data or other problem, fake it. */ |
| complain (&subscript_data_items, DIE_ID, DIE_NAME); |
| nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| } |
| rangetype = create_range_type ((struct type *) NULL, indextype, |
| lowbound, highbound); |
| typep = create_array_type ((struct type *) NULL, nexttype, rangetype); |
| 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: |
| complain (&unhandled_array_subscript_format, DIE_ID, DIE_NAME, format); |
| nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0); |
| typep = create_array_type ((struct type *) NULL, nexttype, rangetype); |
| break; |
| default: |
| complain (&unknown_array_subscript_format, DIE_ID, DIE_NAME, format); |
| nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0); |
| typep = create_array_type ((struct type *) NULL, nexttype, rangetype); |
| 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 |
| dwarf_read_array_type (dip) |
| struct dieinfo *dip; |
| { |
| struct type *type; |
| struct type *utype; |
| char *sub; |
| char *subend; |
| unsigned short blocksz; |
| int nbytes; |
| |
| if (dip->at_ordering != ORD_row_major) |
| { |
| /* FIXME: Can gdb even handle column major arrays? */ |
| complain (¬_row_major, DIE_ID, DIE_NAME); |
| } |
| if ((sub = dip->at_subscr_data) != NULL) |
| { |
| nbytes = attribute_size (AT_subscr_data); |
| blocksz = target_to_host (sub, nbytes, GET_UNSIGNED, current_objfile); |
| subend = sub + nbytes + blocksz; |
| sub += nbytes; |
| type = decode_subscript_data_item (sub, subend); |
| if ((utype = lookup_utype (dip->die_ref)) == NULL) |
| { |
| /* Install user defined type that has not been referenced yet. */ |
| alloc_utype (dip->die_ref, type); |
| } |
| else if (TYPE_CODE (utype) == TYPE_CODE_UNDEF) |
| { |
| /* Ick! A forward ref has already generated a blank type in our |
| slot, and this type probably already has things pointing to it |
| (which is what caused it to be created in the first place). |
| If it's just a place holder we can plop our fully defined type |
| on top of it. We can't recover the space allocated for our |
| new type since it might be on an obstack, but we could reuse |
| it if we kept a list of them, but it might not be worth it |
| (FIXME). */ |
| *utype = *type; |
| } |
| else |
| { |
| /* Double ick! Not only is a type already in our slot, but |
| someone has decorated it. Complain and leave it alone. */ |
| complain (&dup_user_type_definition, DIE_ID, DIE_NAME); |
| } |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| read_tag_pointer_type -- read TAG_pointer_type DIE |
| |
| SYNOPSIS |
| |
| static void read_tag_pointer_type (struct dieinfo *dip) |
| |
| DESCRIPTION |
| |
| Extract all information from a TAG_pointer_type DIE and add to |
| the user defined type vector. |
| */ |
| |
| static void |
| read_tag_pointer_type (dip) |
| struct dieinfo *dip; |
| { |
| struct type *type; |
| struct type *utype; |
| |
| type = decode_die_type (dip); |
| if ((utype = lookup_utype (dip->die_ref)) == NULL) |
| { |
| utype = lookup_pointer_type (type); |
| alloc_utype (dip->die_ref, utype); |
| } |
| else |
| { |
| TYPE_TARGET_TYPE (utype) = type; |
| TYPE_POINTER_TYPE (type) = utype; |
| |
| /* We assume the machine has only one representation for pointers! */ |
| /* FIXME: Possably a poor assumption */ |
| TYPE_LENGTH (utype) = TARGET_PTR_BIT / TARGET_CHAR_BIT; |
| TYPE_CODE (utype) = TYPE_CODE_PTR; |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| read_tag_string_type -- read TAG_string_type DIE |
| |
| SYNOPSIS |
| |
| static void read_tag_string_type (struct dieinfo *dip) |
| |
| DESCRIPTION |
| |
| Extract all information from a TAG_string_type DIE and add to |
| the user defined type vector. It isn't really a user defined |
| type, but it behaves like one, with other DIE's using an |
| AT_user_def_type attribute to reference it. |
| */ |
| |
| static void |
| read_tag_string_type (dip) |
| struct dieinfo *dip; |
| { |
| struct type *utype; |
| struct type *indextype; |
| struct type *rangetype; |
| unsigned long lowbound = 0; |
| unsigned long highbound; |
| |
| if (dip->has_at_byte_size) |
| { |
| /* A fixed bounds string */ |
| highbound = dip->at_byte_size - 1; |
| } |
| else |
| { |
| /* A varying length string. Stub for now. (FIXME) */ |
| highbound = 1; |
| } |
| indextype = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| rangetype = create_range_type ((struct type *) NULL, indextype, lowbound, |
| highbound); |
| |
| utype = lookup_utype (dip->die_ref); |
| if (utype == NULL) |
| { |
| /* No type defined, go ahead and create a blank one to use. */ |
| utype = alloc_utype (dip->die_ref, (struct type *) NULL); |
| } |
| else |
| { |
| /* Already a type in our slot due to a forward reference. Make sure it |
| is a blank one. If not, complain and leave it alone. */ |
| if (TYPE_CODE (utype) != TYPE_CODE_UNDEF) |
| { |
| complain (&dup_user_type_definition, DIE_ID, DIE_NAME); |
| return; |
| } |
| } |
| |
| /* Create the string type using the blank type we either found or created. */ |
| utype = create_string_type (utype, rangetype); |
| } |
| |
| /* |
| |
| 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 |
| read_subroutine_type (dip, thisdie, enddie) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| { |
| struct type *type; /* Type that this function returns */ |
| struct type *ftype; /* Function that returns above type */ |
| |
| /* Decode the type that this subroutine returns */ |
| |
| type = decode_die_type (dip); |
| |
| /* Check to see if we already have a partially constructed user |
| defined type for this DIE, from a forward reference. */ |
| |
| if ((ftype = lookup_utype (dip->die_ref)) == NULL) |
| { |
| /* This is the first reference to one of these types. Make |
| a new one and place it in the user defined types. */ |
| ftype = lookup_function_type (type); |
| alloc_utype (dip->die_ref, ftype); |
| } |
| else if (TYPE_CODE (ftype) == TYPE_CODE_UNDEF) |
| { |
| /* We have an existing partially constructed type, so bash it |
| into the correct type. */ |
| TYPE_TARGET_TYPE (ftype) = type; |
| TYPE_LENGTH (ftype) = 1; |
| TYPE_CODE (ftype) = TYPE_CODE_FUNC; |
| } |
| else |
| { |
| complain (&dup_user_type_definition, DIE_ID, DIE_NAME); |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| read_enumeration -- process dies which define an enumeration |
| |
| SYNOPSIS |
| |
| static void read_enumeration (struct dieinfo *dip, char *thisdie, |
| char *enddie, struct objfile *objfile) |
| |
| 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 |
| read_enumeration (dip, thisdie, enddie, objfile) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| struct type *type; |
| struct symbol *sym; |
| |
| type = enum_type (dip, objfile); |
| sym = new_symbol (dip, objfile); |
| if (sym != NULL) |
| { |
| SYMBOL_TYPE (sym) = type; |
| if (cu_language == language_cplus) |
| { |
| synthesize_typedef (dip, objfile, type); |
| } |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| enum_type -- decode and return a type for an enumeration |
| |
| SYNOPSIS |
| |
| static type *enum_type (struct dieinfo *dip, struct objfile *objfile) |
| |
| 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 6, sec 3.8.5, 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 * |
| enum_type (dip, objfile) |
| struct dieinfo *dip; |
| 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 *scan; |
| char *listend; |
| unsigned short blocksz; |
| struct symbol *sym; |
| int nbytes; |
| int unsigned_enum = 1; |
| |
| if ((type = lookup_utype (dip->die_ref)) == NULL) |
| { |
| /* No forward references created an empty type, so install one now */ |
| type = alloc_utype (dip->die_ref, 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_TAG_NAME (type) = obconcat (&objfile->type_obstack, |
| "", "", 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) |
| { |
| nbytes = attribute_size (AT_short_element_list); |
| } |
| else |
| { |
| nbytes = attribute_size (AT_element_list); |
| } |
| blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile); |
| listend = scan + nbytes + blocksz; |
| scan += nbytes; |
| while (scan < listend) |
| { |
| new = (struct nextfield *) alloca (sizeof (struct nextfield)); |
| new->next = list; |
| list = new; |
| FIELD_TYPE (list->field) = NULL; |
| FIELD_BITSIZE (list->field) = 0; |
| FIELD_BITPOS (list->field) = |
| target_to_host (scan, TARGET_FT_LONG_SIZE (objfile), GET_SIGNED, |
| objfile); |
| scan += TARGET_FT_LONG_SIZE (objfile); |
| list->field.name = obsavestring (scan, strlen (scan), |
| &objfile->type_obstack); |
| scan += strlen (scan) + 1; |
| nfields++; |
| /* Handcraft a new symbol for this enum member. */ |
| sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack, |
| sizeof (struct symbol)); |
| memset (sym, 0, sizeof (struct symbol)); |
| SYMBOL_NAME (sym) = create_name (list->field.name, |
| &objfile->symbol_obstack); |
| SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language); |
| SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; |
| SYMBOL_CLASS (sym) = LOC_CONST; |
| SYMBOL_TYPE (sym) = type; |
| SYMBOL_VALUE (sym) = FIELD_BITPOS (list->field); |
| if (SYMBOL_VALUE (sym) < 0) |
| unsigned_enum = 0; |
| 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 off 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) |
| { |
| if (unsigned_enum) |
| TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED; |
| TYPE_NFIELDS (type) = nfields; |
| TYPE_FIELDS (type) = (struct field *) |
| obstack_alloc (&objfile->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 |
| read_func_scope (dip, thisdie, enddie, objfile) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| register struct context_stack *new; |
| |
| /* AT_name is absent if the function is described with an |
| AT_abstract_origin tag. |
| Ignore the function description for now to avoid GDB core dumps. |
| FIXME: Add code to handle AT_abstract_origin tags properly. */ |
| if (dip->at_name == NULL) |
| { |
| complain (&missing_at_name, DIE_ID); |
| return; |
| } |
| |
| if (objfile->ei.entry_point >= dip->at_low_pc && |
| objfile->ei.entry_point < dip->at_high_pc) |
| { |
| objfile->ei.entry_func_lowpc = dip->at_low_pc; |
| objfile->ei.entry_func_highpc = dip->at_high_pc; |
| } |
| if (STREQ (dip->at_name, "main")) /* FIXME: hardwired name */ |
| { |
| objfile->ei.main_func_lowpc = dip->at_low_pc; |
| objfile->ei.main_func_highpc = dip->at_high_pc; |
| } |
| new = push_context (0, dip->at_low_pc); |
| new->name = new_symbol (dip, objfile); |
| list_in_scope = &local_symbols; |
| process_dies (thisdie + dip->die_length, 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, objfile); |
| list_in_scope = &file_symbols; |
| } |
| |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| handle_producer -- process the AT_producer attribute |
| |
| DESCRIPTION |
| |
| Perform any operations that depend on finding a particular |
| AT_producer attribute. |
| |
| */ |
| |
| static void |
| handle_producer (producer) |
| char *producer; |
| { |
| |
| /* If this compilation unit was compiled with g++ or gcc, then set the |
| processing_gcc_compilation flag. */ |
| |
| if (STREQN (producer, GCC_PRODUCER, strlen (GCC_PRODUCER))) |
| { |
| char version = producer[strlen (GCC_PRODUCER)]; |
| processing_gcc_compilation = (version == '2' ? 2 : 1); |
| } |
| else |
| { |
| processing_gcc_compilation = |
| STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)) |
| || STREQN (producer, CHILL_PRODUCER, strlen (CHILL_PRODUCER)); |
| } |
| |
| /* Select a demangling style if we can identify the producer and if |
| the current style is auto. We leave the current style alone if it |
| is not auto. We also leave the demangling style alone if we find a |
| gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */ |
| |
| if (AUTO_DEMANGLING) |
| { |
| if (STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER))) |
| { |
| set_demangling_style (GNU_DEMANGLING_STYLE_STRING); |
| } |
| else if (STREQN (producer, LCC_PRODUCER, strlen (LCC_PRODUCER))) |
| { |
| set_demangling_style (LUCID_DEMANGLING_STYLE_STRING); |
| } |
| } |
| } |
| |
| |
| /* |
| |
| 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 |
| read_file_scope (dip, thisdie, enddie, objfile) |
| struct dieinfo *dip; |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| struct cleanup *back_to; |
| struct symtab *symtab; |
| |
| if (objfile->ei.entry_point >= dip->at_low_pc && |
| objfile->ei.entry_point < dip->at_high_pc) |
| { |
| objfile->ei.entry_file_lowpc = dip->at_low_pc; |
| objfile->ei.entry_file_highpc = dip->at_high_pc; |
| } |
| set_cu_language (dip); |
| if (dip->at_producer != NULL) |
| { |
| handle_producer (dip->at_producer); |
| } |
| numutypes = (enddie - thisdie) / 4; |
| utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *)); |
| back_to = make_cleanup (free_utypes, NULL); |
| memset (utypes, 0, numutypes * sizeof (struct type *)); |
| memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *)); |
| start_symtab (dip->at_name, dip->at_comp_dir, dip->at_low_pc); |
| record_debugformat ("DWARF 1"); |
| decode_line_numbers (lnbase); |
| process_dies (thisdie + dip->die_length, enddie, objfile); |
| |
| symtab = end_symtab (dip->at_high_pc, objfile, 0); |
| if (symtab != NULL) |
| { |
| symtab->language = cu_language; |
| } |
| do_cleanups (back_to); |
| } |
| |
| /* |
| |
| 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 |
| process_dies (thisdie, enddie, objfile) |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| char *nextdie; |
| struct dieinfo di; |
| |
| while (thisdie < enddie) |
| { |
| basicdieinfo (&di, thisdie, objfile); |
| if (di.die_length < SIZEOF_DIE_LENGTH) |
| { |
| break; |
| } |
| else if (di.die_tag == TAG_padding) |
| { |
| nextdie = thisdie + di.die_length; |
| } |
| else |
| { |
| completedieinfo (&di, objfile); |
| if (di.at_sibling != 0) |
| { |
| nextdie = dbbase + di.at_sibling - dbroff; |
| } |
| else |
| { |
| nextdie = thisdie + di.die_length; |
| } |
| #ifdef SMASH_TEXT_ADDRESS |
| /* I think that these are always text, not data, addresses. */ |
| SMASH_TEXT_ADDRESS (di.at_low_pc); |
| SMASH_TEXT_ADDRESS (di.at_high_pc); |
| #endif |
| switch (di.die_tag) |
| { |
| case TAG_compile_unit: |
| /* Skip Tag_compile_unit if we are already inside a compilation |
| unit, we are unable to handle nested compilation units |
| properly (FIXME). */ |
| if (current_subfile == NULL) |
| read_file_scope (&di, thisdie, nextdie, objfile); |
| else |
| nextdie = thisdie + di.die_length; |
| 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_class_type: |
| 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, objfile); |
| break; |
| case TAG_subroutine_type: |
| read_subroutine_type (&di, thisdie, nextdie); |
| break; |
| case TAG_array_type: |
| dwarf_read_array_type (&di); |
| break; |
| case TAG_pointer_type: |
| read_tag_pointer_type (&di); |
| break; |
| case TAG_string_type: |
| read_tag_string_type (&di); |
| break; |
| default: |
| new_symbol (&di, objfile); |
| 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 |
| decode_line_numbers (linetable) |
| char *linetable; |
| { |
| char *tblscan; |
| char *tblend; |
| unsigned long length; |
| unsigned long base; |
| unsigned long line; |
| unsigned long pc; |
| |
| if (linetable != NULL) |
| { |
| tblscan = tblend = linetable; |
| length = target_to_host (tblscan, SIZEOF_LINETBL_LENGTH, GET_UNSIGNED, |
| current_objfile); |
| tblscan += SIZEOF_LINETBL_LENGTH; |
| tblend += length; |
| base = target_to_host (tblscan, TARGET_FT_POINTER_SIZE (objfile), |
| GET_UNSIGNED, current_objfile); |
| tblscan += TARGET_FT_POINTER_SIZE (objfile); |
| base += baseaddr; |
| while (tblscan < tblend) |
| { |
| line = target_to_host (tblscan, SIZEOF_LINETBL_LINENO, GET_UNSIGNED, |
| current_objfile); |
| tblscan += SIZEOF_LINETBL_LINENO + SIZEOF_LINETBL_STMT; |
| pc = target_to_host (tblscan, SIZEOF_LINETBL_DELTA, GET_UNSIGNED, |
| current_objfile); |
| tblscan += SIZEOF_LINETBL_DELTA; |
| 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 (struct dieinfo *dip) |
| |
| DESCRIPTION |
| |
| Given pointer to a string of bytes that define a location, compute |
| the location and return the value. |
| A location description containing no atoms indicates that the |
| object is optimized out. The optimized_out flag is set for those, |
| the return value is meaningless. |
| |
| When computing values involving the current value of the frame pointer, |
| the value zero is used, which results in a value relative to the frame |
| pointer, rather than the absolute value. This is what GDB wants |
| anyway. |
| |
| When the result is a register number, the 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 |
| locval (dip) |
| struct dieinfo *dip; |
| { |
| unsigned short nbytes; |
| unsigned short locsize; |
| auto long stack[64]; |
| int stacki; |
| char *loc; |
| char *end; |
| int loc_atom_code; |
| int loc_value_size; |
| |
| loc = dip->at_location; |
| nbytes = attribute_size (AT_location); |
| locsize = target_to_host (loc, nbytes, GET_UNSIGNED, current_objfile); |
| loc += nbytes; |
| end = loc + locsize; |
| stacki = 0; |
| stack[stacki] = 0; |
| dip->isreg = 0; |
| dip->offreg = 0; |
| dip->optimized_out = 1; |
| loc_value_size = TARGET_FT_LONG_SIZE (current_objfile); |
| while (loc < end) |
| { |
| dip->optimized_out = 0; |
| loc_atom_code = target_to_host (loc, SIZEOF_LOC_ATOM_CODE, GET_UNSIGNED, |
| current_objfile); |
| loc += SIZEOF_LOC_ATOM_CODE; |
| switch (loc_atom_code) |
| { |
| case 0: |
| /* error */ |
| loc = end; |
| break; |
| case OP_REG: |
| /* push register (number) */ |
| stack[++stacki] |
| = DWARF_REG_TO_REGNUM (target_to_host (loc, loc_value_size, |
| GET_UNSIGNED, |
| current_objfile)); |
| loc += loc_value_size; |
| dip->isreg = 1; |
| break; |
| case OP_BASEREG: |
| /* push value of register (number) */ |
| /* Actually, we compute the value as if register has 0, so the |
| value ends up being the offset from that register. */ |
| dip->offreg = 1; |
| dip->basereg = target_to_host (loc, loc_value_size, GET_UNSIGNED, |
| current_objfile); |
| loc += loc_value_size; |
| stack[++stacki] = 0; |
| break; |
| case OP_ADDR: |
| /* push address (relocated address) */ |
| stack[++stacki] = target_to_host (loc, loc_value_size, |
| GET_UNSIGNED, current_objfile); |
| loc += loc_value_size; |
| break; |
| case OP_CONST: |
| /* push constant (number) FIXME: signed or unsigned! */ |
| stack[++stacki] = target_to_host (loc, loc_value_size, |
| GET_SIGNED, current_objfile); |
| loc += loc_value_size; |
| break; |
| case OP_DEREF2: |
| /* pop, deref and push 2 bytes (as a long) */ |
| complain (&op_deref2, DIE_ID, DIE_NAME, stack[stacki]); |
| break; |
| case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */ |
| complain (&op_deref4, DIE_ID, DIE_NAME, 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 void read_ofile_symtab (struct partial_symtab *pst) |
| |
| DESCRIPTION |
| |
| When expanding a partial symbol table entry to a full symbol table |
| entry, this is the function that gets called to read in the symbols |
| for the compilation unit. A pointer to the newly constructed symtab, |
| which is now the new first one on the objfile's symtab list, is |
| stashed in the partial symbol table entry. |
| */ |
| |
| static void |
| read_ofile_symtab (pst) |
| struct partial_symtab *pst; |
| { |
| struct cleanup *back_to; |
| unsigned long lnsize; |
| file_ptr foffset; |
| bfd *abfd; |
| char lnsizedata[SIZEOF_LINETBL_LENGTH]; |
| |
| abfd = pst->objfile->obfd; |
| current_objfile = pst->objfile; |
| |
| /* 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; |
| dbsize = DBLENGTH (pst); |
| dbbase = xmalloc (dbsize); |
| dbroff = DBROFF (pst); |
| foffset = DBFOFF (pst) + dbroff; |
| base_section_offsets = pst->section_offsets; |
| baseaddr = ANOFFSET (pst->section_offsets, 0); |
| if (bfd_seek (abfd, foffset, SEEK_SET) || |
| (bfd_read (dbbase, dbsize, 1, abfd) != dbsize)) |
| { |
| 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 size of this fragment in bytes, from the fragment 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), SEEK_SET) || |
| (bfd_read ((PTR) lnsizedata, sizeof (lnsizedata), 1, abfd) != |
| sizeof (lnsizedata))) |
| { |
| error ("can't read DWARF line number table size"); |
| } |
| lnsize = target_to_host (lnsizedata, SIZEOF_LINETBL_LENGTH, |
| GET_UNSIGNED, pst->objfile); |
| lnbase = xmalloc (lnsize); |
| if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) || |
| (bfd_read (lnbase, lnsize, 1, abfd) != lnsize)) |
| { |
| free (lnbase); |
| error ("can't read DWARF line numbers"); |
| } |
| make_cleanup (free, lnbase); |
| } |
| |
| process_dies (dbbase, dbbase + dbsize, pst->objfile); |
| do_cleanups (back_to); |
| current_objfile = NULL; |
| pst->symtab = pst->objfile->symtabs; |
| } |
| |
| /* |
| |
| 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 |
| psymtab_to_symtab_1 (pst) |
| struct partial_symtab *pst; |
| { |
| int i; |
| struct cleanup *old_chain; |
| |
| if (pst != NULL) |
| { |
| if (pst->readin) |
| { |
| warning ("psymtab for %s already read in. Shouldn't happen.", |
| pst->filename); |
| } |
| else |
| { |
| /* 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 (" ", gdb_stdout); |
| wrap_here (""); |
| fputs_filtered ("and ", gdb_stdout); |
| wrap_here (""); |
| printf_filtered ("%s...", |
| pst->dependencies[i]->filename); |
| wrap_here (""); |
| gdb_flush (gdb_stdout); /* Flush output */ |
| } |
| psymtab_to_symtab_1 (pst->dependencies[i]); |
| } |
| } |
| if (DBLENGTH (pst)) /* Otherwise it's a dummy */ |
| { |
| buildsym_init (); |
| old_chain = make_cleanup (really_free_pendings, 0); |
| read_ofile_symtab (pst); |
| if (info_verbose) |
| { |
| printf_filtered ("%d DIE's, sorting...", diecount); |
| wrap_here (""); |
| gdb_flush (gdb_stdout); |
| } |
| sort_symtab_syms (pst->symtab); |
| do_cleanups (old_chain); |
| } |
| 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 |
| dwarf_psymtab_to_symtab (pst) |
| struct partial_symtab *pst; |
| { |
| |
| if (pst != NULL) |
| { |
| if (pst->readin) |
| { |
| warning ("psymtab for %s already read in. Shouldn't happen.", |
| pst->filename); |
| } |
| else |
| { |
| 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); |
| gdb_flush (gdb_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 (pst->objfile); |
| #endif |
| |
| /* Finish up the verbose info message. */ |
| if (info_verbose) |
| { |
| printf_filtered ("done.\n"); |
| gdb_flush (gdb_stdout); |
| } |
| } |
| } |
| } |
| } |
| |
| /* |
| |
| 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 |
| add_enum_psymbol (dip, objfile) |
| struct dieinfo *dip; |
| struct objfile *objfile; |
| { |
| char *scan; |
| char *listend; |
| unsigned short blocksz; |
| int nbytes; |
| |
| if ((scan = dip->at_element_list) != NULL) |
| { |
| if (dip->short_element_list) |
| { |
| nbytes = attribute_size (AT_short_element_list); |
| } |
| else |
| { |
| nbytes = attribute_size (AT_element_list); |
| } |
| blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile); |
| scan += nbytes; |
| listend = scan + blocksz; |
| while (scan < listend) |
| { |
| scan += TARGET_FT_LONG_SIZE (objfile); |
| add_psymbol_to_list (scan, strlen (scan), VAR_NAMESPACE, LOC_CONST, |
| &objfile->static_psymbols, 0, 0, cu_language, |
| objfile); |
| 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. |
| |
| NOTES |
| |
| The caller must ensure that the DIE has a valid name attribute. |
| */ |
| |
| static void |
| add_partial_symbol (dip, objfile) |
| struct dieinfo *dip; |
| struct objfile *objfile; |
| { |
| switch (dip->die_tag) |
| { |
| case TAG_global_subroutine: |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| VAR_NAMESPACE, LOC_BLOCK, |
| &objfile->global_psymbols, |
| 0, dip->at_low_pc, cu_language, objfile); |
| break; |
| case TAG_global_variable: |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| VAR_NAMESPACE, LOC_STATIC, |
| &objfile->global_psymbols, |
| 0, 0, cu_language, objfile); |
| break; |
| case TAG_subroutine: |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| VAR_NAMESPACE, LOC_BLOCK, |
| &objfile->static_psymbols, |
| 0, dip->at_low_pc, cu_language, objfile); |
| break; |
| case TAG_local_variable: |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| VAR_NAMESPACE, LOC_STATIC, |
| &objfile->static_psymbols, |
| 0, 0, cu_language, objfile); |
| break; |
| case TAG_typedef: |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| VAR_NAMESPACE, LOC_TYPEDEF, |
| &objfile->static_psymbols, |
| 0, 0, cu_language, objfile); |
| break; |
| case TAG_class_type: |
| case TAG_structure_type: |
| case TAG_union_type: |
| case TAG_enumeration_type: |
| /* Do not add opaque aggregate definitions to the psymtab. */ |
| if (!dip->has_at_byte_size) |
| break; |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| STRUCT_NAMESPACE, LOC_TYPEDEF, |
| &objfile->static_psymbols, |
| 0, 0, cu_language, objfile); |
| if (cu_language == language_cplus) |
| { |
| /* For C++, these implicitly act as typedefs as well. */ |
| add_psymbol_to_list (dip->at_name, strlen (dip->at_name), |
| VAR_NAMESPACE, LOC_TYPEDEF, |
| &objfile->static_psymbols, |
| 0, 0, cu_language, objfile); |
| } |
| break; |
| } |
| } |
| /* *INDENT-OFF* */ |
| /* |
| |
| 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. |
| |
| NOTES |
| |
| There are some DIE's that may appear both at file scope and within |
| the scope of a function. We are only interested in the ones at file |
| scope, and the only way to tell them apart is to keep track of the |
| scope. For example, consider the test case: |
| |
| static int i; |
| main () { int j; } |
| |
| for which the relevant DWARF segment has the structure: |
| |
| 0x51: |
| 0x23 global subrtn sibling 0x9b |
| name main |
| fund_type FT_integer |
| low_pc 0x800004cc |
| high_pc 0x800004d4 |
| |
| 0x74: |
| 0x23 local var sibling 0x97 |
| name j |
| fund_type FT_integer |
| location OP_BASEREG 0xe |
| OP_CONST 0xfffffffc |
| OP_ADD |
| 0x97: |
| 0x4 |
| |
| 0x9b: |
| 0x1d local var sibling 0xb8 |
| name i |
| fund_type FT_integer |
| location OP_ADDR 0x800025dc |
| |
| 0xb8: |
| 0x4 |
| |
| We want to include the symbol 'i' in the partial symbol table, but |
| not the symbol 'j'. In essence, we want to skip all the dies within |
| the scope of a TAG_global_subroutine DIE. |
| |
| 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. |
| */ |
| /* *INDENT-ON* */ |
| |
| |
| |
| static void |
| scan_partial_symbols (thisdie, enddie, objfile) |
| char *thisdie; |
| char *enddie; |
| struct objfile *objfile; |
| { |
| char *nextdie; |
| char *temp; |
| struct dieinfo di; |
| |
| while (thisdie < enddie) |
| { |
| basicdieinfo (&di, thisdie, objfile); |
| if (di.die_length < SIZEOF_DIE_LENGTH) |
| { |
| break; |
| } |
| else |
| { |
| nextdie = thisdie + di.die_length; |
| /* To avoid getting complete die information for every die, we |
| only do it (below) for the cases we are interested in. */ |
| switch (di.die_tag) |
| { |
| case TAG_global_subroutine: |
| case TAG_subroutine: |
| completedieinfo (&di, objfile); |
| if (di.at_name && (di.has_at_low_pc || di.at_location)) |
| { |
| add_partial_symbol (&di, objfile); |
| /* If there is a sibling attribute, adjust the nextdie |
| pointer to skip the entire scope of the subroutine. |
| Apply some sanity checking to make sure we don't |
| overrun or underrun the range of remaining DIE's */ |
| if (di.at_sibling != 0) |
| { |
| temp = dbbase + di.at_sibling - dbroff; |
| if ((temp < thisdie) || (temp >= enddie)) |
| { |
| complain (&bad_die_ref, DIE_ID, DIE_NAME, |
| di.at_sibling); |
| } |
| else |
| { |
| nextdie = temp; |
| } |
| } |
| } |
| break; |
| case TAG_global_variable: |
| case TAG_local_variable: |
| completedieinfo (&di, objfile); |
| if (di.at_name && (di.has_at_low_pc || di.at_location)) |
| { |
| add_partial_symbol (&di, objfile); |
| } |
| break; |
| case TAG_typedef: |
| case TAG_class_type: |
| case TAG_structure_type: |
| case TAG_union_type: |
| completedieinfo (&di, objfile); |
| if (di.at_name) |
| { |
| add_partial_symbol (&di, objfile); |
| } |
| break; |
| case TAG_enumeration_type: |
| completedieinfo (&di, objfile); |
| if (di.at_name) |
| { |
| add_partial_symbol (&di, objfile); |
| } |
| add_enum_psymbol (&di, objfile); |
| 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 |
| scan_compilation_units (thisdie, enddie, dbfoff, lnoffset, objfile) |
| char *thisdie; |
| char *enddie; |
| file_ptr dbfoff; |
| file_ptr lnoffset; |
| struct objfile *objfile; |
| { |
| char *nextdie; |
| struct dieinfo di; |
| struct partial_symtab *pst; |
| int culength; |
| int curoff; |
| file_ptr curlnoffset; |
| |
| while (thisdie < enddie) |
| { |
| basicdieinfo (&di, thisdie, objfile); |
| if (di.die_length < SIZEOF_DIE_LENGTH) |
| { |
| break; |
| } |
| else if (di.die_tag != TAG_compile_unit) |
| { |
| nextdie = thisdie + di.die_length; |
| } |
| else |
| { |
| completedieinfo (&di, objfile); |
| set_cu_language (&di); |
| if (di.at_sibling != 0) |
| { |
| nextdie = dbbase + di.at_sibling - dbroff; |
| } |
| else |
| { |
| nextdie = thisdie + di.die_length; |
| } |
| curoff = thisdie - dbbase; |
| culength = nextdie - thisdie; |
| curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0; |
| |
| /* First allocate a new partial symbol table structure */ |
| |
| pst = start_psymtab_common (objfile, base_section_offsets, |
| di.at_name, di.at_low_pc, |
| objfile->global_psymbols.next, |
| objfile->static_psymbols.next); |
| |
| pst->texthigh = di.at_high_pc; |
| pst->read_symtab_private = (char *) |
| obstack_alloc (&objfile->psymbol_obstack, |
| sizeof (struct dwfinfo)); |
| DBFOFF (pst) = dbfoff; |
| DBROFF (pst) = curoff; |
| DBLENGTH (pst) = culength; |
| LNFOFF (pst) = curlnoffset; |
| pst->read_symtab = dwarf_psymtab_to_symtab; |
| |
| /* Now look for partial symbols */ |
| |
| scan_partial_symbols (thisdie + di.die_length, nextdie, objfile); |
| |
| pst->n_global_syms = objfile->global_psymbols.next - |
| (objfile->global_psymbols.list + pst->globals_offset); |
| pst->n_static_syms = objfile->static_psymbols.next - |
| (objfile->static_psymbols.list + pst->statics_offset); |
| sort_pst_symbols (pst); |
| /* 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); |
| } |
| thisdie = nextdie; |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| new_symbol -- make a symbol table entry for a new symbol |
| |
| SYNOPSIS |
| |
| static struct symbol *new_symbol (struct dieinfo *dip, |
| struct objfile *objfile) |
| |
| 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 * |
| new_symbol (dip, objfile) |
| struct dieinfo *dip; |
| struct objfile *objfile; |
| { |
| struct symbol *sym = NULL; |
| |
| if (dip->at_name != NULL) |
| { |
| sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack, |
| sizeof (struct symbol)); |
| OBJSTAT (objfile, n_syms++); |
| memset (sym, 0, sizeof (struct symbol)); |
| SYMBOL_NAME (sym) = create_name (dip->at_name, |
| &objfile->symbol_obstack); |
| /* default assumptions */ |
| SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; |
| SYMBOL_CLASS (sym) = LOC_STATIC; |
| SYMBOL_TYPE (sym) = decode_die_type (dip); |
| |
| /* If this symbol is from a C++ compilation, then attempt to cache the |
| demangled form for future reference. This is a typical time versus |
| space tradeoff, that was decided in favor of time because it sped up |
| C++ symbol lookups by a factor of about 20. */ |
| |
| SYMBOL_LANGUAGE (sym) = cu_language; |
| SYMBOL_INIT_DEMANGLED_NAME (sym, &objfile->symbol_obstack); |
| switch (dip->die_tag) |
| { |
| case TAG_label: |
| SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc; |
| SYMBOL_CLASS (sym) = LOC_LABEL; |
| break; |
| case TAG_global_subroutine: |
| case TAG_subroutine: |
| SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc; |
| SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym)); |
| if (dip->at_prototyped) |
| TYPE_FLAGS (SYMBOL_TYPE (sym)) |= TYPE_FLAG_PROTOTYPED; |
| SYMBOL_CLASS (sym) = LOC_BLOCK; |
| if (dip->die_tag == 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_ADDRESS (sym) = locval (dip); |
| 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) |
| { |
| int loc = locval (dip); |
| if (dip->optimized_out) |
| { |
| SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT; |
| } |
| else if (dip->isreg) |
| { |
| SYMBOL_CLASS (sym) = LOC_REGISTER; |
| } |
| else if (dip->offreg) |
| { |
| SYMBOL_CLASS (sym) = LOC_BASEREG; |
| SYMBOL_BASEREG (sym) = dip->basereg; |
| } |
| else |
| { |
| SYMBOL_CLASS (sym) = LOC_STATIC; |
| SYMBOL_VALUE (sym) += baseaddr; |
| } |
| if (SYMBOL_CLASS (sym) == LOC_STATIC) |
| { |
| /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS, |
| which may store to a bigger location than SYMBOL_VALUE. */ |
| SYMBOL_VALUE_ADDRESS (sym) = loc; |
| } |
| else |
| { |
| SYMBOL_VALUE (sym) = loc; |
| } |
| add_symbol_to_list (sym, list_in_scope); |
| } |
| break; |
| case TAG_formal_parameter: |
| if (dip->at_location != NULL) |
| { |
| SYMBOL_VALUE (sym) = locval (dip); |
| } |
| add_symbol_to_list (sym, list_in_scope); |
| if (dip->isreg) |
| { |
| SYMBOL_CLASS (sym) = LOC_REGPARM; |
| } |
| else if (dip->offreg) |
| { |
| SYMBOL_CLASS (sym) = LOC_BASEREG_ARG; |
| SYMBOL_BASEREG (sym) = dip->basereg; |
| } |
| 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_class_type: |
| 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 |
| |
| synthesize_typedef -- make a symbol table entry for a "fake" typedef |
| |
| SYNOPSIS |
| |
| static void synthesize_typedef (struct dieinfo *dip, |
| struct objfile *objfile, |
| struct type *type); |
| |
| DESCRIPTION |
| |
| Given a pointer to a DWARF information entry, synthesize a typedef |
| for the name in the DIE, using the specified type. |
| |
| This is used for C++ class, structs, unions, and enumerations to |
| set up the tag name as a type. |
| |
| */ |
| |
| static void |
| synthesize_typedef (dip, objfile, type) |
| struct dieinfo *dip; |
| struct objfile *objfile; |
| struct type *type; |
| { |
| struct symbol *sym = NULL; |
| |
| if (dip->at_name != NULL) |
| { |
| sym = (struct symbol *) |
| obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol)); |
| OBJSTAT (objfile, n_syms++); |
| memset (sym, 0, sizeof (struct symbol)); |
| SYMBOL_NAME (sym) = create_name (dip->at_name, |
| &objfile->symbol_obstack); |
| SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language); |
| SYMBOL_TYPE (sym) = type; |
| SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
| SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; |
| add_symbol_to_list (sym, list_in_scope); |
| } |
| } |
| |
| /* |
| |
| 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 starts with a length containing the size of the rest |
| of the block. At the end of the block is a fundmental type |
| code 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 * |
| decode_mod_fund_type (typedata) |
| char *typedata; |
| { |
| struct type *typep = NULL; |
| unsigned short modcount; |
| int nbytes; |
| |
| /* Get the total size of the block, exclusive of the size itself */ |
| |
| nbytes = attribute_size (AT_mod_fund_type); |
| modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile); |
| typedata += nbytes; |
| |
| /* Deduct the size of the fundamental type bytes at the end of the block. */ |
| |
| modcount -= attribute_size (AT_fund_type); |
| |
| /* Now do the actual decoding */ |
| |
| typep = decode_modified_type (typedata, 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 * |
| decode_mod_u_d_type (typedata) |
| char *typedata; |
| { |
| struct type *typep = NULL; |
| unsigned short modcount; |
| int nbytes; |
| |
| /* Get the total size of the block, exclusive of the size itself */ |
| |
| nbytes = attribute_size (AT_mod_u_d_type); |
| modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile); |
| typedata += nbytes; |
| |
| /* Deduct the size of the reference type bytes at the end of the block. */ |
| |
| modcount -= attribute_size (AT_user_def_type); |
| |
| /* Now do the actual decoding */ |
| |
| typep = decode_modified_type (typedata, 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 (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 * |
| decode_modified_type (modifiers, modcount, mtype) |
| char *modifiers; |
| unsigned int modcount; |
| int mtype; |
| { |
| struct type *typep = NULL; |
| unsigned short fundtype; |
| DIE_REF die_ref; |
| char modifier; |
| int nbytes; |
| |
| if (modcount == 0) |
| { |
| switch (mtype) |
| { |
| case AT_mod_fund_type: |
| nbytes = attribute_size (AT_fund_type); |
| fundtype = target_to_host (modifiers, nbytes, GET_UNSIGNED, |
| current_objfile); |
| typep = decode_fund_type (fundtype); |
| break; |
| case AT_mod_u_d_type: |
| nbytes = attribute_size (AT_user_def_type); |
| die_ref = target_to_host (modifiers, nbytes, GET_UNSIGNED, |
| current_objfile); |
| if ((typep = lookup_utype (die_ref)) == NULL) |
| { |
| typep = alloc_utype (die_ref, NULL); |
| } |
| break; |
| default: |
| complain (&botched_modified_type, DIE_ID, DIE_NAME, mtype); |
| typep = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| 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: |
| complain (&const_ignored, DIE_ID, DIE_NAME); /* FIXME */ |
| break; |
| case MOD_volatile: |
| complain (&volatile_ignored, DIE_ID, DIE_NAME); /* FIXME */ |
| break; |
| default: |
| if (!(MOD_lo_user <= (unsigned char) modifier |
| && (unsigned char) modifier <= MOD_hi_user)) |
| { |
| complain (&unknown_type_modifier, DIE_ID, DIE_NAME, 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 |
| |
| For robustness, if we are asked to translate a fundamental |
| type that we are unprepared to deal with, we return int so |
| callers can always depend upon a valid type being returned, |
| and so gdb may at least do something reasonable by default. |
| If the type is not in the range of those types defined as |
| application specific types, we also issue a warning. |
| */ |
| |
| static struct type * |
| decode_fund_type (fundtype) |
| unsigned int fundtype; |
| { |
| struct type *typep = NULL; |
| |
| switch (fundtype) |
| { |
| |
| case FT_void: |
| typep = dwarf_fundamental_type (current_objfile, FT_VOID); |
| break; |
| |
| case FT_boolean: /* Was FT_set in AT&T version */ |
| typep = dwarf_fundamental_type (current_objfile, FT_BOOLEAN); |
| break; |
| |
| case FT_pointer: /* (void *) */ |
| typep = dwarf_fundamental_type (current_objfile, FT_VOID); |
| typep = lookup_pointer_type (typep); |
| break; |
| |
| case FT_char: |
| typep = dwarf_fundamental_type (current_objfile, FT_CHAR); |
| break; |
| |
| case FT_signed_char: |
| typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_CHAR); |
| break; |
| |
| case FT_unsigned_char: |
| typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_CHAR); |
| break; |
| |
| case FT_short: |
| typep = dwarf_fundamental_type (current_objfile, FT_SHORT); |
| break; |
| |
| case FT_signed_short: |
| typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_SHORT); |
| break; |
| |
| case FT_unsigned_short: |
| typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_SHORT); |
| break; |
| |
| case FT_integer: |
| typep = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| break; |
| |
| case FT_signed_integer: |
| typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_INTEGER); |
| break; |
| |
| case FT_unsigned_integer: |
| typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER); |
| break; |
| |
| case FT_long: |
| typep = dwarf_fundamental_type (current_objfile, FT_LONG); |
| break; |
| |
| case FT_signed_long: |
| typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG); |
| break; |
| |
| case FT_unsigned_long: |
| typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG); |
| break; |
| |
| case FT_long_long: |
| typep = dwarf_fundamental_type (current_objfile, FT_LONG_LONG); |
| break; |
| |
| case FT_signed_long_long: |
| typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG_LONG); |
| break; |
| |
| case FT_unsigned_long_long: |
| typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG); |
| break; |
| |
| case FT_float: |
| typep = dwarf_fundamental_type (current_objfile, FT_FLOAT); |
| break; |
| |
| case FT_dbl_prec_float: |
| typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT); |
| break; |
| |
| case FT_ext_prec_float: |
| typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT); |
| break; |
| |
| case FT_complex: |
| typep = dwarf_fundamental_type (current_objfile, FT_COMPLEX); |
| break; |
| |
| case FT_dbl_prec_complex: |
| typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_COMPLEX); |
| break; |
| |
| case FT_ext_prec_complex: |
| typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_COMPLEX); |
| break; |
| |
| } |
| |
| if (typep == NULL) |
| { |
| typep = dwarf_fundamental_type (current_objfile, FT_INTEGER); |
| if (!(FT_lo_user <= fundtype && fundtype <= FT_hi_user)) |
| { |
| complain (&unexpected_fund_type, DIE_ID, DIE_NAME, fundtype); |
| } |
| } |
| |
| 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 * |
| create_name (name, obstackp) |
| char *name; |
| struct obstack *obstackp; |
| { |
| int length; |
| char *newname; |
| |
| length = strlen (name) + 1; |
| newname = (char *) obstack_alloc (obstackp, length); |
| 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, |
| struct objfile *objfile) |
| |
| 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), and there is no |
| guarantee that it is in the same byte order as the gdb host, |
| we call a function which deals with both alignment and byte |
| swapping issues. 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_DIE_LENGTH. In order to have a valid tag, the |
| DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they |
| are forced to be TAG_padding DIES. |
| |
| Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying |
| that if a padding DIE is used for alignment and the amount needed is |
| less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big |
| enough to align to the next alignment boundry. |
| |
| We do some basic sanity checking here, such as verifying that the |
| length of the die would not cause it to overrun the recorded end of |
| the buffer holding the DIE info. If we find a DIE that is either |
| too small or too large, we force it's length to zero which should |
| cause the caller to take appropriate action. |
| */ |
| |
| static void |
| basicdieinfo (dip, diep, objfile) |
| struct dieinfo *dip; |
| char *diep; |
| struct objfile *objfile; |
| { |
| curdie = dip; |
| memset (dip, 0, sizeof (struct dieinfo)); |
| dip->die = diep; |
| dip->die_ref = dbroff + (diep - dbbase); |
| dip->die_length = target_to_host (diep, SIZEOF_DIE_LENGTH, GET_UNSIGNED, |
| objfile); |
| if ((dip->die_length < SIZEOF_DIE_LENGTH) || |
| ((diep + dip->die_length) > (dbbase + dbsize))) |
| { |
| complain (&malformed_die, DIE_ID, DIE_NAME, dip->die_length); |
| dip->die_length = 0; |
| } |
| else if (dip->die_length < (SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG)) |
| { |
| dip->die_tag = TAG_padding; |
| } |
| else |
| { |
| diep += SIZEOF_DIE_LENGTH; |
| dip->die_tag = target_to_host (diep, SIZEOF_DIE_TAG, GET_UNSIGNED, |
| objfile); |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| completedieinfo -- finish reading the information for a given DIE |
| |
| SYNOPSIS |
| |
| void completedieinfo (struct dieinfo *dip, struct objfile *objfile) |
| |
| 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), and there is no |
| guarantee that it is in the same byte order as the gdb host, |
| we call a function which deals with both alignment and byte |
| swapping issues. 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 |
| completedieinfo (dip, objfile) |
| struct dieinfo *dip; |
| struct objfile *objfile; |
| { |
| 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 */ |
| int nbytes; /* Size of next field to read */ |
| |
| diecount++; |
| diep = dip->die; |
| end = diep + dip->die_length; |
| diep += SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG; |
| while (diep < end) |
| { |
| attr = target_to_host (diep, SIZEOF_ATTRIBUTE, GET_UNSIGNED, objfile); |
| diep += SIZEOF_ATTRIBUTE; |
| if ((nbytes = attribute_size (attr)) == -1) |
| { |
| complain (&unknown_attribute_length, DIE_ID, DIE_NAME); |
| diep = end; |
| continue; |
| } |
| switch (attr) |
| { |
| case AT_fund_type: |
| dip->at_fund_type = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_ordering: |
| dip->at_ordering = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_bit_offset: |
| dip->at_bit_offset = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_sibling: |
| dip->at_sibling = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_stmt_list: |
| dip->at_stmt_list = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| dip->has_at_stmt_list = 1; |
| break; |
| case AT_low_pc: |
| dip->at_low_pc = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| dip->at_low_pc += baseaddr; |
| dip->has_at_low_pc = 1; |
| break; |
| case AT_high_pc: |
| dip->at_high_pc = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| dip->at_high_pc += baseaddr; |
| break; |
| case AT_language: |
| dip->at_language = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_user_def_type: |
| dip->at_user_def_type = target_to_host (diep, nbytes, |
| GET_UNSIGNED, objfile); |
| break; |
| case AT_byte_size: |
| dip->at_byte_size = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| dip->has_at_byte_size = 1; |
| break; |
| case AT_bit_size: |
| dip->at_bit_size = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_member: |
| dip->at_member = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_discr: |
| dip->at_discr = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| 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: |
| /* For now, ignore any "hostname:" portion, since gdb doesn't |
| know how to deal with it. (FIXME). */ |
| dip->at_comp_dir = strrchr (diep, ':'); |
| if (dip->at_comp_dir != NULL) |
| { |
| dip->at_comp_dir++; |
| } |
| else |
| { |
| dip->at_comp_dir = diep; |
| } |
| break; |
| case AT_producer: |
| dip->at_producer = diep; |
| break; |
| case AT_start_scope: |
| dip->at_start_scope = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_stride_size: |
| dip->at_stride_size = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_src_info: |
| dip->at_src_info = target_to_host (diep, nbytes, GET_UNSIGNED, |
| objfile); |
| break; |
| case AT_prototyped: |
| dip->at_prototyped = diep; |
| 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 = FORM_FROM_ATTR (attr); |
| switch (form) |
| { |
| case FORM_DATA2: |
| diep += 2; |
| break; |
| case FORM_DATA4: |
| case FORM_REF: |
| diep += 4; |
| break; |
| case FORM_DATA8: |
| diep += 8; |
| break; |
| case FORM_ADDR: |
| diep += TARGET_FT_POINTER_SIZE (objfile); |
| break; |
| case FORM_BLOCK2: |
| diep += 2 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile); |
| break; |
| case FORM_BLOCK4: |
| diep += 4 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile); |
| break; |
| case FORM_STRING: |
| diep += strlen (diep) + 1; |
| break; |
| default: |
| complain (&unknown_attribute_form, DIE_ID, DIE_NAME, form); |
| diep = end; |
| break; |
| } |
| } |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| target_to_host -- swap in target data to host |
| |
| SYNOPSIS |
| |
| target_to_host (char *from, int nbytes, int signextend, |
| struct objfile *objfile) |
| |
| DESCRIPTION |
| |
| Given pointer to data in target format in FROM, a byte count for |
| the size of the data in NBYTES, a flag indicating whether or not |
| the data is signed in SIGNEXTEND, and a pointer to the current |
| objfile in OBJFILE, convert the data to host format and return |
| the converted value. |
| |
| NOTES |
| |
| FIXME: If we read data that is known to be signed, and expect to |
| use it as signed data, then we need to explicitly sign extend the |
| result until the bfd library is able to do this for us. |
| |
| FIXME: Would a 32 bit target ever need an 8 byte result? |
| |
| */ |
| |
| static CORE_ADDR |
| target_to_host (from, nbytes, signextend, objfile) |
| char *from; |
| int nbytes; |
| int signextend; /* FIXME: Unused */ |
| struct objfile *objfile; |
| { |
| CORE_ADDR rtnval; |
| |
| switch (nbytes) |
| { |
| case 8: |
| rtnval = bfd_get_64 (objfile->obfd, (bfd_byte *) from); |
| break; |
| case 4: |
| rtnval = bfd_get_32 (objfile->obfd, (bfd_byte *) from); |
| break; |
| case 2: |
| rtnval = bfd_get_16 (objfile->obfd, (bfd_byte *) from); |
| break; |
| case 1: |
| rtnval = bfd_get_8 (objfile->obfd, (bfd_byte *) from); |
| break; |
| default: |
| complain (&no_bfd_get_N, DIE_ID, DIE_NAME, nbytes); |
| rtnval = 0; |
| break; |
| } |
| return (rtnval); |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| attribute_size -- compute size of data for a DWARF attribute |
| |
| SYNOPSIS |
| |
| static int attribute_size (unsigned int attr) |
| |
| DESCRIPTION |
| |
| Given a DWARF attribute in ATTR, compute the size of the first |
| piece of data associated with this attribute and return that |
| size. |
| |
| Returns -1 for unrecognized attributes. |
| |
| */ |
| |
| static int |
| attribute_size (attr) |
| unsigned int attr; |
| { |
| int nbytes; /* Size of next data for this attribute */ |
| unsigned short form; /* Form of the attribute */ |
| |
| form = FORM_FROM_ATTR (attr); |
| switch (form) |
| { |
| case FORM_STRING: /* A variable length field is next */ |
| nbytes = 0; |
| break; |
| case FORM_DATA2: /* Next 2 byte field is the data itself */ |
| case FORM_BLOCK2: /* Next 2 byte field is a block length */ |
| nbytes = 2; |
| break; |
| case FORM_DATA4: /* Next 4 byte field is the data itself */ |
| case FORM_BLOCK4: /* Next 4 byte field is a block length */ |
| case FORM_REF: /* Next 4 byte field is a DIE offset */ |
| nbytes = 4; |
| break; |
| case FORM_DATA8: /* Next 8 byte field is the data itself */ |
| nbytes = 8; |
| break; |
| case FORM_ADDR: /* Next field size is target sizeof(void *) */ |
| nbytes = TARGET_FT_POINTER_SIZE (objfile); |
| break; |
| default: |
| complain (&unknown_attribute_form, DIE_ID, DIE_NAME, form); |
| nbytes = -1; |
| break; |
| } |
| return (nbytes); |
| } |