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/* Output dbx-format symbol table information from GNU compiler.
Copyright (C) 1987-2015 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 3, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Output dbx-format symbol table data.
This consists of many symbol table entries, each of them
a .stabs assembler pseudo-op with four operands:
a "name" which is really a description of one symbol and its type,
a "code", which is a symbol defined in stab.h whose name starts with N_,
an unused operand always 0,
and a "value" which is an address or an offset.
The name is enclosed in doublequote characters.
Each function, variable, typedef, and structure tag
has a symbol table entry to define it.
The beginning and end of each level of name scoping within
a function are also marked by special symbol table entries.
The "name" consists of the symbol name, a colon, a kind-of-symbol letter,
and a data type number. The data type number may be followed by
"=" and a type definition; normally this will happen the first time
the type number is mentioned. The type definition may refer to
other types by number, and those type numbers may be followed
by "=" and nested definitions.
This can make the "name" quite long.
When a name is more than 80 characters, we split the .stabs pseudo-op
into two .stabs pseudo-ops, both sharing the same "code" and "value".
The first one is marked as continued with a double-backslash at the
end of its "name".
The kind-of-symbol letter distinguished function names from global
variables from file-scope variables from parameters from auto
variables in memory from typedef names from register variables.
See `dbxout_symbol'.
The "code" is mostly redundant with the kind-of-symbol letter
that goes in the "name", but not entirely: for symbols located
in static storage, the "code" says which segment the address is in,
which controls how it is relocated.
The "value" for a symbol in static storage
is the core address of the symbol (actually, the assembler
label for the symbol). For a symbol located in a stack slot
it is the stack offset; for one in a register, the register number.
For a typedef symbol, it is zero.
If DEBUG_SYMS_TEXT is defined, all debugging symbols must be
output while in the text section.
For more on data type definitions, see `dbxout_type'. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "wide-int.h"
#include "inchash.h"
#include "tree.h"
#include "fold-const.h"
#include "varasm.h"
#include "stor-layout.h"
#include "rtl.h"
#include "flags.h"
#include "regs.h"
#include "insn-config.h"
#include "reload.h"
#include "output.h"
#include "dbxout.h"
#include "diagnostic-core.h"
#include "toplev.h"
#include "tm_p.h"
#include "ggc.h"
#include "debug.h"
#include "hashtab.h"
#include "hard-reg-set.h"
#include "function.h"
#include "target.h"
#include "common/common-target.h"
#include "langhooks.h"
#include "obstack.h"
#include "statistics.h"
#include "real.h"
#include "fixed-value.h"
#include "expmed.h"
#include "dojump.h"
#include "explow.h"
#include "calls.h"
#include "emit-rtl.h"
#include "stmt.h"
#include "expr.h"
#include "hash-map.h"
#include "is-a.h"
#include "plugin-api.h"
#include "ipa-ref.h"
#include "cgraph.h"
#include "stringpool.h"
#ifdef XCOFF_DEBUGGING_INFO
#include "xcoffout.h"
#endif
#ifndef ASM_STABS_OP
# ifdef XCOFF_DEBUGGING_INFO
# define ASM_STABS_OP "\t.stabx\t"
# else
# define ASM_STABS_OP "\t.stabs\t"
# endif
#endif
#ifndef ASM_STABN_OP
#define ASM_STABN_OP "\t.stabn\t"
#endif
#ifndef ASM_STABD_OP
#define ASM_STABD_OP "\t.stabd\t"
#endif
#ifndef DBX_TYPE_DECL_STABS_CODE
#define DBX_TYPE_DECL_STABS_CODE N_LSYM
#endif
#ifndef DBX_STATIC_CONST_VAR_CODE
#define DBX_STATIC_CONST_VAR_CODE N_FUN
#endif
#ifndef DBX_REGPARM_STABS_CODE
#define DBX_REGPARM_STABS_CODE N_RSYM
#endif
#ifndef DBX_REGPARM_STABS_LETTER
#define DBX_REGPARM_STABS_LETTER 'P'
#endif
#ifndef NO_DBX_FUNCTION_END
#define NO_DBX_FUNCTION_END 0
#endif
#ifndef NO_DBX_BNSYM_ENSYM
#define NO_DBX_BNSYM_ENSYM 0
#endif
#ifndef NO_DBX_MAIN_SOURCE_DIRECTORY
#define NO_DBX_MAIN_SOURCE_DIRECTORY 0
#endif
#ifndef DBX_BLOCKS_FUNCTION_RELATIVE
#define DBX_BLOCKS_FUNCTION_RELATIVE 0
#endif
#ifndef DBX_LINES_FUNCTION_RELATIVE
#define DBX_LINES_FUNCTION_RELATIVE 0
#endif
#ifndef DBX_CONTIN_LENGTH
#define DBX_CONTIN_LENGTH 80
#endif
#ifndef DBX_CONTIN_CHAR
#define DBX_CONTIN_CHAR '\\'
#endif
enum typestatus {TYPE_UNSEEN, TYPE_XREF, TYPE_DEFINED};
/* Structure recording information about a C data type.
The status element says whether we have yet output
the definition of the type. TYPE_XREF says we have
output it as a cross-reference only.
The file_number and type_number elements are used if DBX_USE_BINCL
is defined. */
struct GTY(()) typeinfo {
enum typestatus status;
int file_number;
int type_number;
};
/* Vector recording information about C data types.
When we first notice a data type (a tree node),
we assign it a number using next_type_number.
That is its index in this vector. */
static GTY ((length ("typevec_len"))) struct typeinfo *typevec;
/* Number of elements of space allocated in `typevec'. */
static GTY(()) int typevec_len;
/* In dbx output, each type gets a unique number.
This is the number for the next type output.
The number, once assigned, is in the TYPE_SYMTAB_ADDRESS field. */
static GTY(()) int next_type_number;
/* The C front end may call dbxout_symbol before dbxout_init runs.
We save all such decls in this list and output them when we get
to dbxout_init. */
static GTY(()) tree preinit_symbols;
enum binclstatus {BINCL_NOT_REQUIRED, BINCL_PENDING, BINCL_PROCESSED};
/* When using N_BINCL in dbx output, each type number is actually a
pair of the file number and the type number within the file.
This is a stack of input files. */
struct dbx_file
{
struct dbx_file *next;
int file_number;
int next_type_number;
enum binclstatus bincl_status; /* Keep track of lazy bincl. */
const char *pending_bincl_name; /* Name of bincl. */
struct dbx_file *prev; /* Chain to traverse all pending bincls. */
};
/* This is the top of the stack.
This is not saved for PCH, because restoring a PCH should not change it.
next_file_number does have to be saved, because the PCH may use some
file numbers; however, just before restoring a PCH, next_file_number
should always be 0 because we should not have needed any file numbers
yet. */
#if (defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)) \
&& defined (DBX_USE_BINCL)
static struct dbx_file *current_file;
#endif
/* This is the next file number to use. */
static GTY(()) int next_file_number;
/* A counter for dbxout_function_end. */
static GTY(()) int scope_labelno;
/* A counter for dbxout_source_line. */
static GTY(()) int dbxout_source_line_counter;
/* Number for the next N_SOL filename stabs label. The number 0 is reserved
for the N_SO filename stabs label. */
static GTY(()) int source_label_number = 1;
/* Last source file name mentioned in a NOTE insn. */
static GTY(()) const char *lastfile;
/* Used by PCH machinery to detect if 'lastfile' should be reset to
base_input_file. */
static GTY(()) int lastfile_is_base;
/* Typical USG systems don't have stab.h, and they also have
no use for DBX-format debugging info. */
#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
#ifdef DBX_USE_BINCL
/* If zero then there is no pending BINCL. */
static int pending_bincls = 0;
#endif
/* The original input file name. */
static const char *base_input_file;
#ifdef DEBUG_SYMS_TEXT
#define FORCE_TEXT switch_to_section (current_function_section ())
#else
#define FORCE_TEXT
#endif
#include "gstab.h"
/* 1 if PARM is passed to this function in memory. */
#define PARM_PASSED_IN_MEMORY(PARM) \
(MEM_P (DECL_INCOMING_RTL (PARM)))
/* A C expression for the integer offset value of an automatic variable
(N_LSYM) having address X (an RTX). */
#ifndef DEBUGGER_AUTO_OFFSET
#define DEBUGGER_AUTO_OFFSET(X) \
(GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0)
#endif
/* A C expression for the integer offset value of an argument (N_PSYM)
having address X (an RTX). The nominal offset is OFFSET.
Note that we use OFFSET + 0 here to avoid the self-assign warning
when the macro is called in a context like
number = DEBUGGER_ARG_OFFSET(number, X) */
#ifndef DEBUGGER_ARG_OFFSET
#define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET + 0)
#endif
/* This obstack holds the stab string currently being constructed. We
build it up here, then write it out, so we can split long lines up
properly (see dbxout_finish_complex_stabs). */
static struct obstack stabstr_ob;
static size_t stabstr_last_contin_point;
#ifdef DBX_USE_BINCL
static void emit_bincl_stab (const char *c);
static void emit_pending_bincls (void);
#endif
static inline void emit_pending_bincls_if_required (void);
static void dbxout_init (const char *);
static void dbxout_finish (const char *);
static void dbxout_start_source_file (unsigned, const char *);
static void dbxout_end_source_file (unsigned);
static void dbxout_typedefs (tree);
static void dbxout_type_index (tree);
static void dbxout_args (tree);
static void dbxout_type_fields (tree);
static void dbxout_type_method_1 (tree);
static void dbxout_type_methods (tree);
static void dbxout_range_type (tree, tree, tree);
static void dbxout_type (tree, int);
static bool print_int_cst_bounds_in_octal_p (tree, tree, tree);
static bool is_fortran (void);
static void dbxout_type_name (tree);
static void dbxout_class_name_qualifiers (tree);
static int dbxout_symbol_location (tree, tree, const char *, rtx);
static void dbxout_symbol_name (tree, const char *, int);
static void dbxout_common_name (tree, const char *, stab_code_type);
static const char *dbxout_common_check (tree, int *);
static void dbxout_global_decl (tree);
static void dbxout_type_decl (tree, int);
static void dbxout_handle_pch (unsigned);
static void debug_free_queue (void);
/* The debug hooks structure. */
#if defined (DBX_DEBUGGING_INFO)
static void dbxout_source_line (unsigned int, const char *, int, bool);
static void dbxout_begin_prologue (unsigned int, const char *);
static void dbxout_source_file (const char *);
static void dbxout_function_end (tree);
static void dbxout_begin_function (tree);
static void dbxout_begin_block (unsigned, unsigned);
static void dbxout_end_block (unsigned, unsigned);
static void dbxout_function_decl (tree);
const struct gcc_debug_hooks dbx_debug_hooks =
{
dbxout_init,
dbxout_finish,
debug_nothing_void,
debug_nothing_int_charstar,
debug_nothing_int_charstar,
dbxout_start_source_file,
dbxout_end_source_file,
dbxout_begin_block,
dbxout_end_block,
debug_true_const_tree, /* ignore_block */
dbxout_source_line, /* source_line */
dbxout_begin_prologue, /* begin_prologue */
debug_nothing_int_charstar, /* end_prologue */
debug_nothing_int_charstar, /* begin_epilogue */
debug_nothing_int_charstar, /* end_epilogue */
#ifdef DBX_FUNCTION_FIRST
dbxout_begin_function,
#else
debug_nothing_tree, /* begin_function */
#endif
debug_nothing_int, /* end_function */
debug_nothing_tree, /* register_main_translation_unit */
dbxout_function_decl,
dbxout_global_decl, /* global_decl */
dbxout_type_decl, /* type_decl */
debug_nothing_tree_tree_tree_bool, /* imported_module_or_decl */
debug_nothing_tree, /* deferred_inline_function */
debug_nothing_tree, /* outlining_inline_function */
debug_nothing_rtx_code_label, /* label */
dbxout_handle_pch, /* handle_pch */
debug_nothing_rtx_insn, /* var_location */
debug_nothing_void, /* switch_text_section */
debug_nothing_tree_tree, /* set_name */
0, /* start_end_main_source_file */
TYPE_SYMTAB_IS_ADDRESS /* tree_type_symtab_field */
};
#endif /* DBX_DEBUGGING_INFO */
#if defined (XCOFF_DEBUGGING_INFO)
const struct gcc_debug_hooks xcoff_debug_hooks =
{
dbxout_init,
dbxout_finish,
debug_nothing_void,
debug_nothing_int_charstar,
debug_nothing_int_charstar,
dbxout_start_source_file,
dbxout_end_source_file,
xcoffout_begin_block,
xcoffout_end_block,
debug_true_const_tree, /* ignore_block */
xcoffout_source_line,
xcoffout_begin_prologue, /* begin_prologue */
debug_nothing_int_charstar, /* end_prologue */
debug_nothing_int_charstar, /* begin_epilogue */
xcoffout_end_epilogue,
debug_nothing_tree, /* begin_function */
xcoffout_end_function,
debug_nothing_tree, /* register_main_translation_unit */
debug_nothing_tree, /* function_decl */
dbxout_global_decl, /* global_decl */
dbxout_type_decl, /* type_decl */
debug_nothing_tree_tree_tree_bool, /* imported_module_or_decl */
debug_nothing_tree, /* deferred_inline_function */
debug_nothing_tree, /* outlining_inline_function */
debug_nothing_rtx_code_label, /* label */
dbxout_handle_pch, /* handle_pch */
debug_nothing_rtx_insn, /* var_location */
debug_nothing_void, /* switch_text_section */
debug_nothing_tree_tree, /* set_name */
0, /* start_end_main_source_file */
TYPE_SYMTAB_IS_ADDRESS /* tree_type_symtab_field */
};
#endif /* XCOFF_DEBUGGING_INFO */
/* Numeric formatting helper macro. Note that this does not handle
hexadecimal. */
#define NUMBER_FMT_LOOP(P, NUM, BASE) \
do \
{ \
int digit = NUM % BASE; \
NUM /= BASE; \
*--P = digit + '0'; \
} \
while (NUM > 0)
/* Utility: write a decimal integer NUM to asm_out_file. */
void
dbxout_int (int num)
{
char buf[64];
char *p = buf + sizeof buf;
unsigned int unum;
if (num == 0)
{
putc ('0', asm_out_file);
return;
}
if (num < 0)
{
putc ('-', asm_out_file);
unum = -num;
}
else
unum = num;
NUMBER_FMT_LOOP (p, unum, 10);
while (p < buf + sizeof buf)
{
putc (*p, asm_out_file);
p++;
}
}
/* Primitives for emitting simple stabs directives. All other stabs
routines should use these functions instead of directly emitting
stabs. They are exported because machine-dependent code may need
to invoke them, e.g. in a DBX_OUTPUT_* macro whose definition
forwards to code in CPU.c. */
/* The following functions should all be called immediately after one
of the dbxout_begin_stab* functions (below). They write out
various things as the value of a stab. */
/* Write out a literal zero as the value of a stab. */
void
dbxout_stab_value_zero (void)
{
fputs ("0\n", asm_out_file);
}
/* Write out the label LABEL as the value of a stab. */
void
dbxout_stab_value_label (const char *label)
{
assemble_name (asm_out_file, label);
putc ('\n', asm_out_file);
}
/* Write out the difference of two labels, LABEL - BASE, as the value
of a stab. */
void
dbxout_stab_value_label_diff (const char *label, const char *base)
{
assemble_name (asm_out_file, label);
putc ('-', asm_out_file);
assemble_name (asm_out_file, base);
putc ('\n', asm_out_file);
}
/* Write out an internal label as the value of a stab, and immediately
emit that internal label. This should be used only when
dbxout_stabd will not work. STEM is the name stem of the label,
COUNTERP is a pointer to a counter variable which will be used to
guarantee label uniqueness. */
void
dbxout_stab_value_internal_label (const char *stem, int *counterp)
{
char label[100];
int counter = counterp ? (*counterp)++ : 0;
ASM_GENERATE_INTERNAL_LABEL (label, stem, counter);
dbxout_stab_value_label (label);
targetm.asm_out.internal_label (asm_out_file, stem, counter);
}
/* Write out the difference between BASE and an internal label as the
value of a stab, and immediately emit that internal label. STEM and
COUNTERP are as for dbxout_stab_value_internal_label. */
void
dbxout_stab_value_internal_label_diff (const char *stem, int *counterp,
const char *base)
{
char label[100];
int counter = counterp ? (*counterp)++ : 0;
ASM_GENERATE_INTERNAL_LABEL (label, stem, counter);
dbxout_stab_value_label_diff (label, base);
targetm.asm_out.internal_label (asm_out_file, stem, counter);
}
/* The following functions produce specific kinds of stab directives. */
/* Write a .stabd directive with type STYPE and desc SDESC to asm_out_file. */
void
dbxout_stabd (int stype, int sdesc)
{
fputs (ASM_STABD_OP, asm_out_file);
dbxout_int (stype);
fputs (",0,", asm_out_file);
dbxout_int (sdesc);
putc ('\n', asm_out_file);
}
/* Write a .stabn directive with type STYPE. This function stops
short of emitting the value field, which is the responsibility of
the caller (normally it will be either a symbol or the difference
of two symbols). */
void
dbxout_begin_stabn (int stype)
{
fputs (ASM_STABN_OP, asm_out_file);
dbxout_int (stype);
fputs (",0,0,", asm_out_file);
}
/* Write a .stabn directive with type N_SLINE and desc LINE. As above,
the value field is the responsibility of the caller. */
void
dbxout_begin_stabn_sline (int lineno)
{
fputs (ASM_STABN_OP, asm_out_file);
dbxout_int (N_SLINE);
fputs (",0,", asm_out_file);
dbxout_int (lineno);
putc (',', asm_out_file);
}
/* Begin a .stabs directive with string "", type STYPE, and desc and
other fields 0. The value field is the responsibility of the
caller. This function cannot be used for .stabx directives. */
void
dbxout_begin_empty_stabs (int stype)
{
fputs (ASM_STABS_OP, asm_out_file);
fputs ("\"\",", asm_out_file);
dbxout_int (stype);
fputs (",0,0,", asm_out_file);
}
/* Begin a .stabs directive with string STR, type STYPE, and desc 0.
The value field is the responsibility of the caller. */
void
dbxout_begin_simple_stabs (const char *str, int stype)
{
fputs (ASM_STABS_OP, asm_out_file);
output_quoted_string (asm_out_file, str);
putc (',', asm_out_file);
dbxout_int (stype);
fputs (",0,0,", asm_out_file);
}
/* As above but use SDESC for the desc field. */
void
dbxout_begin_simple_stabs_desc (const char *str, int stype, int sdesc)
{
fputs (ASM_STABS_OP, asm_out_file);
output_quoted_string (asm_out_file, str);
putc (',', asm_out_file);
dbxout_int (stype);
fputs (",0,", asm_out_file);
dbxout_int (sdesc);
putc (',', asm_out_file);
}
/* The next set of functions are entirely concerned with production of
"complex" .stabs directives: that is, .stabs directives whose
strings have to be constructed piecemeal. dbxout_type,
dbxout_symbol, etc. use these routines heavily. The string is queued
up in an obstack, then written out by dbxout_finish_complex_stabs, which
is also responsible for splitting it up if it exceeds DBX_CONTIN_LENGTH.
(You might think it would be more efficient to go straight to stdio
when DBX_CONTIN_LENGTH is 0 (i.e. no length limit) but that turns
out not to be the case, and anyway this needs fewer #ifdefs.) */
/* Begin a complex .stabs directive. If we can, write the initial
ASM_STABS_OP to the asm_out_file. */
static void
dbxout_begin_complex_stabs (void)
{
emit_pending_bincls_if_required ();
FORCE_TEXT;
fputs (ASM_STABS_OP, asm_out_file);
putc ('"', asm_out_file);
gcc_assert (stabstr_last_contin_point == 0);
}
/* As above, but do not force text or emit pending bincls. This is
used by dbxout_symbol_location, which needs to do something else. */
static void
dbxout_begin_complex_stabs_noforcetext (void)
{
fputs (ASM_STABS_OP, asm_out_file);
putc ('"', asm_out_file);
gcc_assert (stabstr_last_contin_point == 0);
}
/* Add CHR, a single character, to the string being built. */
#define stabstr_C(chr) obstack_1grow (&stabstr_ob, chr)
/* Add STR, a normal C string, to the string being built. */
#define stabstr_S(str) obstack_grow (&stabstr_ob, str, strlen (str))
/* Add the text of ID, an IDENTIFIER_NODE, to the string being built. */
#define stabstr_I(id) obstack_grow (&stabstr_ob, \
IDENTIFIER_POINTER (id), \
IDENTIFIER_LENGTH (id))
/* Add NUM, a signed decimal number, to the string being built. */
static void
stabstr_D (HOST_WIDE_INT num)
{
char buf[64];
char *p = buf + sizeof buf;
unsigned int unum;
if (num == 0)
{
stabstr_C ('0');
return;
}
if (num < 0)
{
stabstr_C ('-');
unum = -num;
}
else
unum = num;
NUMBER_FMT_LOOP (p, unum, 10);
obstack_grow (&stabstr_ob, p, (buf + sizeof buf) - p);
}
/* Add NUM, an unsigned decimal number, to the string being built. */
static void
stabstr_U (unsigned HOST_WIDE_INT num)
{
char buf[64];
char *p = buf + sizeof buf;
if (num == 0)
{
stabstr_C ('0');
return;
}
NUMBER_FMT_LOOP (p, num, 10);
obstack_grow (&stabstr_ob, p, (buf + sizeof buf) - p);
}
/* Add CST, an INTEGER_CST tree, to the string being built as an
unsigned octal number. This routine handles values which are
larger than a single HOST_WIDE_INT. */
static void
stabstr_O (tree cst)
{
int prec = TYPE_PRECISION (TREE_TYPE (cst));
int res_pres = prec % 3;
int i;
unsigned int digit;
/* Leading zero for base indicator. */
stabstr_C ('0');
/* If the value is zero, the base indicator will serve as the value
all by itself. */
if (wi::eq_p (cst, 0))
return;
/* GDB wants constants with no extra leading "1" bits, so
we need to remove any sign-extension that might be
present. */
if (res_pres == 1)
{
digit = wi::extract_uhwi (cst, prec - 1, 1);
stabstr_C ('0' + digit);
}
else if (res_pres == 2)
{
digit = wi::extract_uhwi (cst, prec - 2, 2);
stabstr_C ('0' + digit);
}
prec -= res_pres;
for (i = prec - 3; i >= 0; i = i - 3)
{
digit = wi::extract_uhwi (cst, i, 3);
stabstr_C ('0' + digit);
}
}
/* Called whenever it is safe to break a stabs string into multiple
.stabs directives. If the current string has exceeded the limit
set by DBX_CONTIN_LENGTH, mark the current position in the buffer
as a continuation point by inserting DBX_CONTIN_CHAR (doubled if
it is a backslash) and a null character. */
static inline void
stabstr_continue (void)
{
if (DBX_CONTIN_LENGTH > 0
&& obstack_object_size (&stabstr_ob) - stabstr_last_contin_point
> DBX_CONTIN_LENGTH)
{
if (DBX_CONTIN_CHAR == '\\')
obstack_1grow (&stabstr_ob, '\\');
obstack_1grow (&stabstr_ob, DBX_CONTIN_CHAR);
obstack_1grow (&stabstr_ob, '\0');
stabstr_last_contin_point = obstack_object_size (&stabstr_ob);
}
}
#define CONTIN stabstr_continue ()
/* Macro subroutine of dbxout_finish_complex_stabs, which emits
all of the arguments to the .stabs directive after the string.
Overridden by xcoffout.h. CODE is the stabs code for this symbol;
LINE is the source line to write into the desc field (in extended
mode); SYM is the symbol itself.
ADDR, LABEL, and NUMBER are three different ways to represent the
stabs value field. At most one of these should be nonzero.
ADDR is used most of the time; it represents the value as an
RTL address constant.
LABEL is used (currently) only for N_CATCH stabs; it represents
the value as a string suitable for assemble_name.
NUMBER is used when the value is an offset from an implicit base
pointer (e.g. for a stack variable), or an index (e.g. for a
register variable). It represents the value as a decimal integer. */
#ifndef DBX_FINISH_STABS
#define DBX_FINISH_STABS(SYM, CODE, LINE, ADDR, LABEL, NUMBER) \
do { \
int line_ = use_gnu_debug_info_extensions ? LINE : 0; \
\
dbxout_int (CODE); \
fputs (",0,", asm_out_file); \
dbxout_int (line_); \
putc (',', asm_out_file); \
if (ADDR) \
output_addr_const (asm_out_file, ADDR); \
else if (LABEL) \
assemble_name (asm_out_file, LABEL); \
else \
dbxout_int (NUMBER); \
putc ('\n', asm_out_file); \
} while (0)
#endif
/* Finish the emission of a complex .stabs directive. When DBX_CONTIN_LENGTH
is zero, this has only to emit the close quote and the remainder of
the arguments. When it is nonzero, the string has been marshalled in
stabstr_ob, and this routine is responsible for breaking it up into
DBX_CONTIN_LENGTH-sized chunks.
SYM is the DECL of the symbol under consideration; it is used only
for its DECL_SOURCE_LINE. The other arguments are all passed directly
to DBX_FINISH_STABS; see above for details. */
static void
dbxout_finish_complex_stabs (tree sym, stab_code_type code,
rtx addr, const char *label, int number)
{
int line ATTRIBUTE_UNUSED;
char *str;
size_t len;
line = sym ? DECL_SOURCE_LINE (sym) : 0;
if (DBX_CONTIN_LENGTH > 0)
{
char *chunk;
size_t chunklen;
/* Nul-terminate the growing string, then get its size and
address. */
obstack_1grow (&stabstr_ob, '\0');
len = obstack_object_size (&stabstr_ob);
chunk = str = XOBFINISH (&stabstr_ob, char *);
/* Within the buffer are a sequence of NUL-separated strings,
each of which is to be written out as a separate stab
directive. */
for (;;)
{
chunklen = strlen (chunk);
fwrite (chunk, 1, chunklen, asm_out_file);
fputs ("\",", asm_out_file);
/* Must add an extra byte to account for the NUL separator. */
chunk += chunklen + 1;
len -= chunklen + 1;
/* Only put a line number on the last stab in the sequence. */
DBX_FINISH_STABS (sym, code, len == 0 ? line : 0,
addr, label, number);
if (len == 0)
break;
fputs (ASM_STABS_OP, asm_out_file);
putc ('"', asm_out_file);
}
stabstr_last_contin_point = 0;
}
else
{
/* No continuations - we can put the whole string out at once.
It is faster to augment the string with the close quote and
comma than to do a two-character fputs. */
obstack_grow (&stabstr_ob, "\",", 2);
len = obstack_object_size (&stabstr_ob);
str = XOBFINISH (&stabstr_ob, char *);
fwrite (str, 1, len, asm_out_file);
DBX_FINISH_STABS (sym, code, line, addr, label, number);
}
obstack_free (&stabstr_ob, str);
}
#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
/* When -gused is used, emit debug info for only used symbols. But in
addition to the standard intercepted debug_hooks there are some
direct calls into this file, i.e., dbxout_symbol, dbxout_parms, and
dbxout_reg_params. Those routines may also be called from a higher
level intercepted routine. So to prevent recording data for an inner
call to one of these for an intercept, we maintain an intercept
nesting counter (debug_nesting). We only save the intercepted
arguments if the nesting is 1. */
static int debug_nesting = 0;
static tree *symbol_queue;
static int symbol_queue_index = 0;
static int symbol_queue_size = 0;
#define DBXOUT_DECR_NESTING \
if (--debug_nesting == 0 && symbol_queue_index > 0) \
{ emit_pending_bincls_if_required (); debug_flush_symbol_queue (); }
#define DBXOUT_DECR_NESTING_AND_RETURN(x) \
do {--debug_nesting; return (x);} while (0)
#endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */
#if defined (DBX_DEBUGGING_INFO)
static void
dbxout_function_end (tree decl ATTRIBUTE_UNUSED)
{
char lscope_label_name[100];
/* The Lscope label must be emitted even if we aren't doing anything
else; dbxout_block needs it. */
switch_to_section (function_section (current_function_decl));
/* Convert Lscope into the appropriate format for local labels in case
the system doesn't insert underscores in front of user generated
labels. */
ASM_GENERATE_INTERNAL_LABEL (lscope_label_name, "Lscope", scope_labelno);
targetm.asm_out.internal_label (asm_out_file, "Lscope", scope_labelno);
/* The N_FUN tag at the end of the function is a GNU extension,
which may be undesirable, and is unnecessary if we do not have
named sections. */
if (!use_gnu_debug_info_extensions
|| NO_DBX_FUNCTION_END
|| !targetm_common.have_named_sections)
return;
/* By convention, GCC will mark the end of a function with an N_FUN
symbol and an empty string. */
if (flag_reorder_blocks_and_partition)
{
dbxout_begin_empty_stabs (N_FUN);
dbxout_stab_value_label_diff (crtl->subsections.hot_section_end_label,
crtl->subsections.hot_section_label);
dbxout_begin_empty_stabs (N_FUN);
dbxout_stab_value_label_diff (crtl->subsections.cold_section_end_label,
crtl->subsections.cold_section_label);
}
else
{
char begin_label[20];
/* Reference current function start using LFBB. */
ASM_GENERATE_INTERNAL_LABEL (begin_label, "LFBB", scope_labelno);
dbxout_begin_empty_stabs (N_FUN);
dbxout_stab_value_label_diff (lscope_label_name, begin_label);
}
if (!NO_DBX_BNSYM_ENSYM && !flag_debug_only_used_symbols)
dbxout_stabd (N_ENSYM, 0);
}
#endif /* DBX_DEBUGGING_INFO */
/* Get lang description for N_SO stab. */
static unsigned int ATTRIBUTE_UNUSED
get_lang_number (void)
{
const char *language_string = lang_hooks.name;
if (lang_GNU_C ())
return N_SO_C;
else if (lang_GNU_CXX ())
return N_SO_CC;
else if (strcmp (language_string, "GNU F77") == 0)
return N_SO_FORTRAN;
else if (lang_GNU_Fortran ())
return N_SO_FORTRAN90; /* CHECKME */
else if (strcmp (language_string, "GNU Pascal") == 0)
return N_SO_PASCAL;
else if (strcmp (language_string, "GNU Objective-C") == 0)
return N_SO_OBJC;
else if (strcmp (language_string, "GNU Objective-C++") == 0)
return N_SO_OBJCPLUS;
else
return 0;
}
static bool
is_fortran (void)
{
unsigned int lang = get_lang_number ();
return (lang == N_SO_FORTRAN) || (lang == N_SO_FORTRAN90);
}
/* At the beginning of compilation, start writing the symbol table.
Initialize `typevec' and output the standard data types of C. */
static void
dbxout_init (const char *input_file_name)
{
char ltext_label_name[100];
bool used_ltext_label_name = false;
tree syms = lang_hooks.decls.getdecls ();
const char *mapped_name;
typevec_len = 100;
typevec = ggc_cleared_vec_alloc<typeinfo> (typevec_len);
/* stabstr_ob contains one string, which will be just fine with
1-byte alignment. */
obstack_specify_allocation (&stabstr_ob, 0, 1, xmalloc, free);
/* Convert Ltext into the appropriate format for local labels in case
the system doesn't insert underscores in front of user generated
labels. */
ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext", 0);
/* Put the current working directory in an N_SO symbol. */
if (use_gnu_debug_info_extensions && !NO_DBX_MAIN_SOURCE_DIRECTORY)
{
static const char *cwd;
if (!cwd)
{
cwd = get_src_pwd ();
if (cwd[0] == '\0')
cwd = "/";
else if (!IS_DIR_SEPARATOR (cwd[strlen (cwd) - 1]))
cwd = concat (cwd, "/", NULL);
cwd = remap_debug_filename (cwd);
}
#ifdef DBX_OUTPUT_MAIN_SOURCE_DIRECTORY
DBX_OUTPUT_MAIN_SOURCE_DIRECTORY (asm_out_file, cwd);
#else /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
dbxout_begin_simple_stabs_desc (cwd, N_SO, get_lang_number ());
dbxout_stab_value_label (ltext_label_name);
used_ltext_label_name = true;
#endif /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
}
mapped_name = remap_debug_filename (input_file_name);
#ifdef DBX_OUTPUT_MAIN_SOURCE_FILENAME
DBX_OUTPUT_MAIN_SOURCE_FILENAME (asm_out_file, mapped_name);
#else
dbxout_begin_simple_stabs_desc (mapped_name, N_SO, get_lang_number ());
dbxout_stab_value_label (ltext_label_name);
used_ltext_label_name = true;
#endif
if (used_ltext_label_name)
{
switch_to_section (text_section);
targetm.asm_out.internal_label (asm_out_file, "Ltext", 0);
}
/* Emit an N_OPT stab to indicate that this file was compiled by GCC.
The string used is historical. */
#ifndef NO_DBX_GCC_MARKER
dbxout_begin_simple_stabs ("gcc2_compiled.", N_OPT);
dbxout_stab_value_zero ();
#endif
base_input_file = lastfile = input_file_name;
next_type_number = 1;
#ifdef DBX_USE_BINCL
current_file = XNEW (struct dbx_file);
current_file->next = NULL;
current_file->file_number = 0;
current_file->next_type_number = 1;
next_file_number = 1;
current_file->prev = NULL;
current_file->bincl_status = BINCL_NOT_REQUIRED;
current_file->pending_bincl_name = NULL;
#endif
/* Get all permanent types that have typedef names, and output them
all, except for those already output. Some language front ends
put these declarations in the top-level scope; some do not;
the latter are responsible for calling debug_hooks->type_decl from
their record_builtin_type function. */
dbxout_typedefs (syms);
if (preinit_symbols)
{
tree t;
for (t = nreverse (preinit_symbols); t; t = TREE_CHAIN (t))
dbxout_symbol (TREE_VALUE (t), 0);
preinit_symbols = 0;
}
}
/* Output any typedef names for types described by TYPE_DECLs in SYMS. */
static void
dbxout_typedefs (tree syms)
{
for (; syms != NULL_TREE; syms = DECL_CHAIN (syms))
{
if (TREE_CODE (syms) == TYPE_DECL)
{
tree type = TREE_TYPE (syms);
if (TYPE_NAME (type)
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& COMPLETE_OR_VOID_TYPE_P (type)
&& ! TREE_ASM_WRITTEN (TYPE_NAME (type)))
dbxout_symbol (TYPE_NAME (type), 0);
}
}
}
#ifdef DBX_USE_BINCL
/* Emit BINCL stab using given name. */
static void
emit_bincl_stab (const char *name)
{
dbxout_begin_simple_stabs (name, N_BINCL);
dbxout_stab_value_zero ();
}
/* If there are pending bincls then it is time to emit all of them. */
static inline void
emit_pending_bincls_if_required (void)
{
if (pending_bincls)
emit_pending_bincls ();
}
/* Emit all pending bincls. */
static void
emit_pending_bincls (void)
{
struct dbx_file *f = current_file;
/* Find first pending bincl. */
while (f->bincl_status == BINCL_PENDING)
f = f->next;
/* Now emit all bincls. */
f = f->prev;
while (f)
{
if (f->bincl_status == BINCL_PENDING)
{
emit_bincl_stab (f->pending_bincl_name);
/* Update file number and status. */
f->file_number = next_file_number++;
f->bincl_status = BINCL_PROCESSED;
}
if (f == current_file)
break;
f = f->prev;
}
/* All pending bincls have been emitted. */
pending_bincls = 0;
}
#else
static inline void
emit_pending_bincls_if_required (void) {}
#endif
/* Change to reading from a new source file. Generate a N_BINCL stab. */
static void
dbxout_start_source_file (unsigned int line ATTRIBUTE_UNUSED,
const char *filename ATTRIBUTE_UNUSED)
{
#ifdef DBX_USE_BINCL
struct dbx_file *n = XNEW (struct dbx_file);
n->next = current_file;
n->next_type_number = 1;
/* Do not assign file number now.
Delay it until we actually emit BINCL. */
n->file_number = 0;
n->prev = NULL;
current_file->prev = n;
n->bincl_status = BINCL_PENDING;
n->pending_bincl_name = remap_debug_filename (filename);
pending_bincls = 1;
current_file = n;
#endif
}
/* Revert to reading a previous source file. Generate a N_EINCL stab. */
static void
dbxout_end_source_file (unsigned int line ATTRIBUTE_UNUSED)
{
#ifdef DBX_USE_BINCL
/* Emit EINCL stab only if BINCL is not pending. */
if (current_file->bincl_status == BINCL_PROCESSED)
{
dbxout_begin_stabn (N_EINCL);
dbxout_stab_value_zero ();
}
current_file->bincl_status = BINCL_NOT_REQUIRED;
current_file = current_file->next;
#endif
}
/* Handle a few odd cases that occur when trying to make PCH files work. */
static void
dbxout_handle_pch (unsigned at_end)
{
if (! at_end)
{
/* When using the PCH, this file will be included, so we need to output
a BINCL. */
dbxout_start_source_file (0, lastfile);
/* The base file when using the PCH won't be the same as
the base file when it's being generated. */
lastfile = NULL;
}
else
{
/* ... and an EINCL. */
dbxout_end_source_file (0);
/* Deal with cases where 'lastfile' was never actually changed. */
lastfile_is_base = lastfile == NULL;
}
}
#if defined (DBX_DEBUGGING_INFO)
static void dbxout_block (tree, int, tree);
/* Output debugging info to FILE to switch to sourcefile FILENAME. */
static void
dbxout_source_file (const char *filename)
{
if (lastfile == 0 && lastfile_is_base)
{
lastfile = base_input_file;
lastfile_is_base = 0;
}
if (filename && (lastfile == 0 || strcmp (filename, lastfile)))
{
/* Don't change section amid function. */
if (current_function_decl == NULL_TREE)
switch_to_section (text_section);
dbxout_begin_simple_stabs (remap_debug_filename (filename), N_SOL);
dbxout_stab_value_internal_label ("Ltext", &source_label_number);
lastfile = filename;
}
}
/* Output N_BNSYM, line number symbol entry, and local symbol at
function scope */
static void
dbxout_begin_prologue (unsigned int lineno, const char *filename)
{
if (use_gnu_debug_info_extensions
&& !NO_DBX_FUNCTION_END
&& !NO_DBX_BNSYM_ENSYM
&& !flag_debug_only_used_symbols)
dbxout_stabd (N_BNSYM, 0);
/* pre-increment the scope counter */
scope_labelno++;
dbxout_source_line (lineno, filename, 0, true);
/* Output function begin block at function scope, referenced
by dbxout_block, dbxout_source_line and dbxout_function_end. */
emit_pending_bincls_if_required ();
targetm.asm_out.internal_label (asm_out_file, "LFBB", scope_labelno);
}
/* Output a line number symbol entry for source file FILENAME and line
number LINENO. */
static void
dbxout_source_line (unsigned int lineno, const char *filename,
int discriminator ATTRIBUTE_UNUSED,
bool is_stmt ATTRIBUTE_UNUSED)
{
dbxout_source_file (filename);
#ifdef DBX_OUTPUT_SOURCE_LINE
DBX_OUTPUT_SOURCE_LINE (asm_out_file, lineno, dbxout_source_line_counter);
#else
if (DBX_LINES_FUNCTION_RELATIVE)
{
char begin_label[20];
dbxout_begin_stabn_sline (lineno);
/* Reference current function start using LFBB. */
ASM_GENERATE_INTERNAL_LABEL (begin_label, "LFBB", scope_labelno);
dbxout_stab_value_internal_label_diff ("LM", &dbxout_source_line_counter,
begin_label);
}
else
dbxout_stabd (N_SLINE, lineno);
#endif
}
/* Describe the beginning of an internal block within a function. */
static void
dbxout_begin_block (unsigned int line ATTRIBUTE_UNUSED, unsigned int n)
{
emit_pending_bincls_if_required ();
targetm.asm_out.internal_label (asm_out_file, "LBB", n);
}
/* Describe the end line-number of an internal block within a function. */
static void
dbxout_end_block (unsigned int line ATTRIBUTE_UNUSED, unsigned int n)
{
emit_pending_bincls_if_required ();
targetm.asm_out.internal_label (asm_out_file, "LBE", n);
}
/* Output dbx data for a function definition.
This includes a definition of the function name itself (a symbol),
definitions of the parameters (locating them in the parameter list)
and then output the block that makes up the function's body
(including all the auto variables of the function). */
static void
dbxout_function_decl (tree decl)
{
emit_pending_bincls_if_required ();
#ifndef DBX_FUNCTION_FIRST
dbxout_begin_function (decl);
#endif
dbxout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl));
dbxout_function_end (decl);
}
#endif /* DBX_DEBUGGING_INFO */
/* Debug information for a global DECL. Called from toplev.c after
compilation proper has finished. */
static void
dbxout_global_decl (tree decl)
{
if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
{
int saved_tree_used = TREE_USED (decl);
TREE_USED (decl) = 1;
dbxout_symbol (decl, 0);
TREE_USED (decl) = saved_tree_used;
}
}
/* This is just a function-type adapter; dbxout_symbol does exactly
what we want but returns an int. */
static void
dbxout_type_decl (tree decl, int local)
{
dbxout_symbol (decl, local);
}
/* At the end of compilation, finish writing the symbol table.
The default is to call debug_free_queue but do nothing else. */
static void
dbxout_finish (const char *filename ATTRIBUTE_UNUSED)
{
#ifdef DBX_OUTPUT_MAIN_SOURCE_FILE_END
DBX_OUTPUT_MAIN_SOURCE_FILE_END (asm_out_file, filename);
#elif defined DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
{
switch_to_section (text_section);
dbxout_begin_empty_stabs (N_SO);
dbxout_stab_value_internal_label ("Letext", 0);
}
#endif
debug_free_queue ();
}
/* Output the index of a type. */
static void
dbxout_type_index (tree type)
{
#ifndef DBX_USE_BINCL
stabstr_D (TYPE_SYMTAB_ADDRESS (type));
#else
struct typeinfo *t = &typevec[TYPE_SYMTAB_ADDRESS (type)];
stabstr_C ('(');
stabstr_D (t->file_number);
stabstr_C (',');
stabstr_D (t->type_number);
stabstr_C (')');
#endif
}
/* Generate the symbols for any queued up type symbols we encountered
while generating the type info for some originally used symbol.
This might generate additional entries in the queue. Only when
the nesting depth goes to 0 is this routine called. */
static void
debug_flush_symbol_queue (void)
{
int i;
/* Make sure that additionally queued items are not flushed
prematurely. */
++debug_nesting;
for (i = 0; i < symbol_queue_index; ++i)
{
/* If we pushed queued symbols then such symbols must be
output no matter what anyone else says. Specifically,
we need to make sure dbxout_symbol() thinks the symbol was
used and also we need to override TYPE_DECL_SUPPRESS_DEBUG
which may be set for outside reasons. */
int saved_tree_used = TREE_USED (symbol_queue[i]);
int saved_suppress_debug = TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]);
TREE_USED (symbol_queue[i]) = 1;
TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = 0;
#ifdef DBX_DEBUGGING_INFO
dbxout_symbol (symbol_queue[i], 0);
#endif
TREE_USED (symbol_queue[i]) = saved_tree_used;
TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = saved_suppress_debug;
}
symbol_queue_index = 0;
--debug_nesting;
}
/* Queue a type symbol needed as part of the definition of a decl
symbol. These symbols are generated when debug_flush_symbol_queue()
is called. */
static void
debug_queue_symbol (tree decl)
{
if (symbol_queue_index >= symbol_queue_size)
{
symbol_queue_size += 10;
symbol_queue = XRESIZEVEC (tree, symbol_queue, symbol_queue_size);
}
symbol_queue[symbol_queue_index++] = decl;
}
/* Free symbol queue. */
static void
debug_free_queue (void)
{
if (symbol_queue)
{
free (symbol_queue);
symbol_queue = NULL;
symbol_queue_size = 0;
}
}
/* Used in several places: evaluates to '0' for a private decl,
'1' for a protected decl, '2' for a public decl. */
#define DECL_ACCESSIBILITY_CHAR(DECL) \
(TREE_PRIVATE (DECL) ? '0' : TREE_PROTECTED (DECL) ? '1' : '2')
/* Subroutine of `dbxout_type'. Output the type fields of TYPE.
This must be a separate function because anonymous unions require
recursive calls. */
static void
dbxout_type_fields (tree type)
{
tree tem;
/* Output the name, type, position (in bits), size (in bits) of each
field that we can support. */
for (tem = TYPE_FIELDS (type); tem; tem = DECL_CHAIN (tem))
{
/* If one of the nodes is an error_mark or its type is then
return early. */
if (error_operand_p (tem))
return;
/* Omit here local type decls until we know how to support them. */
if (TREE_CODE (tem) == TYPE_DECL
/* Omit here the nameless fields that are used to skip bits. */
|| DECL_IGNORED_P (tem)
/* Omit fields whose position or size are variable or too large to
represent. */
|| (TREE_CODE (tem) == FIELD_DECL
&& (! tree_fits_shwi_p (bit_position (tem))
|| ! DECL_SIZE (tem)
|| ! tree_fits_uhwi_p (DECL_SIZE (tem)))))
continue;
else if (TREE_CODE (tem) != CONST_DECL)
{
/* Continue the line if necessary,
but not before the first field. */
if (tem != TYPE_FIELDS (type))
CONTIN;
if (DECL_NAME (tem))
stabstr_I (DECL_NAME (tem));
stabstr_C (':');
if (use_gnu_debug_info_extensions
&& (TREE_PRIVATE (tem) || TREE_PROTECTED (tem)
|| TREE_CODE (tem) != FIELD_DECL))
{
stabstr_C ('/');
stabstr_C (DECL_ACCESSIBILITY_CHAR (tem));
}
dbxout_type ((TREE_CODE (tem) == FIELD_DECL
&& DECL_BIT_FIELD_TYPE (tem))
? DECL_BIT_FIELD_TYPE (tem) : TREE_TYPE (tem), 0);
if (TREE_CODE (tem) == VAR_DECL)
{
if (TREE_STATIC (tem) && use_gnu_debug_info_extensions)
{
tree name = DECL_ASSEMBLER_NAME (tem);
stabstr_C (':');
stabstr_I (name);
stabstr_C (';');
}
else
/* If TEM is non-static, GDB won't understand it. */
stabstr_S (",0,0;");
}
else
{
stabstr_C (',');
stabstr_D (int_bit_position (tem));
stabstr_C (',');
stabstr_D (tree_to_uhwi (DECL_SIZE (tem)));
stabstr_C (';');
}
}
}
}
/* Subroutine of `dbxout_type_methods'. Output debug info about the
method described DECL. */
static void
dbxout_type_method_1 (tree decl)
{
char c1 = 'A', c2;
if (TREE_CODE (TREE_TYPE (decl)) == FUNCTION_TYPE)
c2 = '?';
else /* it's a METHOD_TYPE. */
{
tree firstarg = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)));
/* A for normal functions.
B for `const' member functions.
C for `volatile' member functions.
D for `const volatile' member functions. */
if (TYPE_READONLY (TREE_TYPE (firstarg)))
c1 += 1;
if (TYPE_VOLATILE (TREE_TYPE (firstarg)))
c1 += 2;
if (DECL_VINDEX (decl))
c2 = '*';
else
c2 = '.';
}
/* ??? Output the mangled name, which contains an encoding of the
method's type signature. May not be necessary anymore. */
stabstr_C (':');
stabstr_I (DECL_ASSEMBLER_NAME (decl));
stabstr_C (';');
stabstr_C (DECL_ACCESSIBILITY_CHAR (decl));
stabstr_C (c1);
stabstr_C (c2);
if (DECL_VINDEX (decl) && tree_fits_shwi_p (DECL_VINDEX (decl)))
{
stabstr_D (tree_to_shwi (DECL_VINDEX (decl)));
stabstr_C (';');
dbxout_type (DECL_CONTEXT (decl), 0);
stabstr_C (';');
}
}
/* Subroutine of `dbxout_type'. Output debug info about the methods defined
in TYPE. */
static void
dbxout_type_methods (tree type)
{
/* C++: put out the method names and their parameter lists */
tree methods = TYPE_METHODS (type);
tree fndecl;
tree last;
if (methods == NULL_TREE)
return;
if (TREE_CODE (methods) != TREE_VEC)
fndecl = methods;
else if (TREE_VEC_ELT (methods, 0) != NULL_TREE)
fndecl = TREE_VEC_ELT (methods, 0);
else
fndecl = TREE_VEC_ELT (methods, 1);
while (fndecl)
{
int need_prefix = 1;
/* Group together all the methods for the same operation.
These differ in the types of the arguments. */
for (last = NULL_TREE;
fndecl && (last == NULL_TREE || DECL_NAME (fndecl) == DECL_NAME (last));
fndecl = DECL_CHAIN (fndecl))
/* Output the name of the field (after overloading), as
well as the name of the field before overloading, along
with its parameter list */
{
/* Skip methods that aren't FUNCTION_DECLs. (In C++, these
include TEMPLATE_DECLs.) The debugger doesn't know what
to do with such entities anyhow. */
if (TREE_CODE (fndecl) != FUNCTION_DECL)
continue;
CONTIN;
last = fndecl;
/* Also ignore abstract methods; those are only interesting to
the DWARF backends. */
if (DECL_IGNORED_P (fndecl) || DECL_ABSTRACT_P (fndecl))
continue;
/* Redundantly output the plain name, since that's what gdb
expects. */
if (need_prefix)
{
stabstr_I (DECL_NAME (fndecl));
stabstr_S ("::");
need_prefix = 0;
}
dbxout_type (TREE_TYPE (fndecl), 0);
dbxout_type_method_1 (fndecl);
}
if (!need_prefix)
stabstr_C (';');
}
}
/* Emit a "range" type specification, which has the form:
"r<index type>;<lower bound>;<upper bound>;".
TYPE is an INTEGER_TYPE, LOW and HIGH are the bounds. */
static void
dbxout_range_type (tree type, tree low, tree high)
{
stabstr_C ('r');
if (TREE_TYPE (type))
dbxout_type (TREE_TYPE (type), 0);
else if (TREE_CODE (type) != INTEGER_TYPE)
dbxout_type (type, 0); /* E.g. Pascal's ARRAY [BOOLEAN] of INTEGER */
else
{
/* Traditionally, we made sure 'int' was type 1, and builtin types
were defined to be sub-ranges of int. Unfortunately, this
does not allow us to distinguish true sub-ranges from integer
types. So, instead we define integer (non-sub-range) types as
sub-ranges of themselves. This matters for Chill. If this isn't
a subrange type, then we want to define it in terms of itself.
However, in C, this may be an anonymous integer type, and we don't
want to emit debug info referring to it. Just calling
dbxout_type_index won't work anyways, because the type hasn't been
defined yet. We make this work for both cases by checked to see
whether this is a defined type, referring to it if it is, and using
'int' otherwise. */
if (TYPE_SYMTAB_ADDRESS (type) != 0)
dbxout_type_index (type);
else
dbxout_type_index (integer_type_node);
}
stabstr_C (';');
if (low && tree_fits_shwi_p (low))
{
if (print_int_cst_bounds_in_octal_p (type, low, high))
stabstr_O (low);
else
stabstr_D (tree_to_shwi (low));
}
else
stabstr_C ('0');
stabstr_C (';');
if (high && tree_fits_shwi_p (high))
{
if (print_int_cst_bounds_in_octal_p (type, low, high))
stabstr_O (high);
else
stabstr_D (tree_to_shwi (high));
stabstr_C (';');
}
else
stabstr_S ("-1;");
}
/* Output a reference to a type. If the type has not yet been
described in the dbx output, output its definition now.
For a type already defined, just refer to its definition
using the type number.
If FULL is nonzero, and the type has been described only with
a forward-reference, output the definition now.
If FULL is zero in this case, just refer to the forward-reference
using the number previously allocated. */
static void
dbxout_type (tree type, int full)
{
static int anonymous_type_number = 0;
tree tem, main_variant, low, high;
if (TREE_CODE (type) == INTEGER_TYPE)
{
if (TREE_TYPE (type) == 0)
{
low = TYPE_MIN_VALUE (type);
high = TYPE_MAX_VALUE (type);
}
else if (subrange_type_for_debug_p (type, &low, &high))
;
/* If this is a subtype that should not be emitted as a subrange type,
use the base type. */
else
{
type = TREE_TYPE (type);
low = TYPE_MIN_VALUE (type);
high = TYPE_MAX_VALUE (type);
}
}
/* If there was an input error and we don't really have a type,
avoid crashing and write something that is at least valid
by assuming `int'. */
if (type == error_mark_node)
type = integer_type_node;
else
{
if (TYPE_NAME (type)
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type)))
full = 0;
}
/* Try to find the "main variant" with the same name. */
if (TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_ORIGINAL_TYPE (TYPE_NAME (type)))
main_variant = TREE_TYPE (TYPE_NAME (type));
else
main_variant = TYPE_MAIN_VARIANT (type);
/* If we are not using extensions, stabs does not distinguish const and
volatile, so there is no need to make them separate types. */
if (!use_gnu_debug_info_extensions)
type = main_variant;
if (TYPE_SYMTAB_ADDRESS (type) == 0)
{
/* Type has no dbx number assigned. Assign next available number. */
TYPE_SYMTAB_ADDRESS (type) = next_type_number++;
/* Make sure type vector is long enough to record about this type. */
if (next_type_number == typevec_len)
{
typevec = GGC_RESIZEVEC (struct typeinfo, typevec, typevec_len * 2);
memset (typevec + typevec_len, 0, typevec_len * sizeof typevec[0]);
typevec_len *= 2;
}
#ifdef DBX_USE_BINCL
emit_pending_bincls_if_required ();
typevec[TYPE_SYMTAB_ADDRESS (type)].file_number
= current_file->file_number;
typevec[TYPE_SYMTAB_ADDRESS (type)].type_number
= current_file->next_type_number++;
#endif
}
if (flag_debug_only_used_symbols)
{
if ((TREE_CODE (type) == RECORD_TYPE
|| TREE_CODE (type) == UNION_TYPE
|| TREE_CODE (type) == QUAL_UNION_TYPE
|| TREE_CODE (type) == ENUMERAL_TYPE)
&& TYPE_STUB_DECL (type)
&& DECL_P (TYPE_STUB_DECL (type))
&& ! DECL_IGNORED_P (TYPE_STUB_DECL (type)))
debug_queue_symbol (TYPE_STUB_DECL (type));
else if (TYPE_NAME (type)
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
debug_queue_symbol (TYPE_NAME (type));
}
/* Output the number of this type, to refer to it. */
dbxout_type_index (type);
#ifdef DBX_TYPE_DEFINED
if (DBX_TYPE_DEFINED (type))
return;
#endif
/* If this type's definition has been output or is now being output,
that is all. */
switch (typevec[TYPE_SYMTAB_ADDRESS (type)].status)
{
case TYPE_UNSEEN:
break;
case TYPE_XREF:
/* If we have already had a cross reference,
and either that's all we want or that's the best we could do,
don't repeat the cross reference.
Sun dbx crashes if we do. */
if (! full || !COMPLETE_TYPE_P (type)
/* No way in DBX fmt to describe a variable size. */
|| ! tree_fits_uhwi_p (TYPE_SIZE (type)))
return;
break;
case TYPE_DEFINED:
return;
}
#ifdef DBX_NO_XREFS
/* For systems where dbx output does not allow the `=xsNAME:' syntax,
leave the type-number completely undefined rather than output
a cross-reference. If we have already used GNU debug info extensions,
then it is OK to output a cross reference. This is necessary to get
proper C++ debug output. */
if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
|| TREE_CODE (type) == QUAL_UNION_TYPE
|| TREE_CODE (type) == ENUMERAL_TYPE)
&& ! use_gnu_debug_info_extensions)
/* We must use the same test here as we use twice below when deciding
whether to emit a cross-reference. */
if ((TYPE_NAME (type) != 0
&& ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_IGNORED_P (TYPE_NAME (type)))
&& !full)
|| !COMPLETE_TYPE_P (type)
/* No way in DBX fmt to describe a variable size. */
|| ! tree_fits_uhwi_p (TYPE_SIZE (type)))
{
typevec[TYPE_SYMTAB_ADDRESS (type)].status = TYPE_XREF;
return;
}
#endif
/* Output a definition now. */
stabstr_C ('=');
/* Mark it as defined, so that if it is self-referent
we will not get into an infinite recursion of definitions. */
typevec[TYPE_SYMTAB_ADDRESS (type)].status = TYPE_DEFINED;
/* If this type is a variant of some other, hand off. Types with
different names are usefully distinguished. We only distinguish
cv-qualified types if we're using extensions. */
if (TYPE_READONLY (type) > TYPE_READONLY (main_variant))
{
stabstr_C ('k');
dbxout_type (build_type_variant (type, 0, TYPE_VOLATILE (type)), 0);
return;
}
else if (TYPE_VOLATILE (type) > TYPE_VOLATILE (main_variant))
{
stabstr_C ('B');
dbxout_type (build_type_variant (type, TYPE_READONLY (type), 0), 0);
return;
}
else if (main_variant != TYPE_MAIN_VARIANT (type))
{
if (flag_debug_only_used_symbols)
{
tree orig_type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
if ((TREE_CODE (orig_type) == RECORD_TYPE
|| TREE_CODE (orig_type) == UNION_TYPE
|| TREE_CODE (orig_type) == QUAL_UNION_TYPE
|| TREE_CODE (orig_type) == ENUMERAL_TYPE)
&& TYPE_STUB_DECL (orig_type)
&& ! DECL_IGNORED_P (TYPE_STUB_DECL (orig_type)))
debug_queue_symbol (TYPE_STUB_DECL (orig_type));
}
/* 'type' is a typedef; output the type it refers to. */
dbxout_type (DECL_ORIGINAL_TYPE (TYPE_NAME (type)), 0);
return;
}
/* else continue. */
switch (TREE_CODE (type))
{
case VOID_TYPE:
case NULLPTR_TYPE:
case LANG_TYPE:
/* For a void type, just define it as itself; i.e., "5=5".
This makes us consider it defined
without saying what it is. The debugger will make it
a void type when the reference is seen, and nothing will
ever override that default. */
dbxout_type_index (type);
break;
case INTEGER_TYPE:
if (type == char_type_node && ! TYPE_UNSIGNED (type))
{
/* Output the type `char' as a subrange of itself!
I don't understand this definition, just copied it
from the output of pcc.
This used to use `r2' explicitly and we used to
take care to make sure that `char' was type number 2. */
stabstr_C ('r');
dbxout_type_index (type);
stabstr_S (";0;127;");
}
/* If this is a subtype of another integer type, always prefer to
write it as a subtype. */
else if (TREE_TYPE (type) != 0
&& TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
{
/* If the size is non-standard, say what it is if we can use
GDB extensions. */
if (use_gnu_debug_info_extensions
&& TYPE_PRECISION (type) != TYPE_PRECISION (integer_type_node))
{
stabstr_S ("@s");
stabstr_D (TYPE_PRECISION (type));
stabstr_C (';');
}
dbxout_range_type (type, low, high);
}
else
{
/* If the size is non-standard, say what it is if we can use
GDB extensions. */
if (use_gnu_debug_info_extensions
&& TYPE_PRECISION (type) != TYPE_PRECISION (integer_type_node))
{
stabstr_S ("@s");
stabstr_D (TYPE_PRECISION (type));
stabstr_C (';');
}
if (print_int_cst_bounds_in_octal_p (type, low, high))
{
stabstr_C ('r');
/* If this type derives from another type, output type index of
parent type. This is particularly important when parent type
is an enumerated type, because not generating the parent type
index would transform the definition of this enumerated type
into a plain unsigned type. */
if (TREE_TYPE (type) != 0)
dbxout_type_index (TREE_TYPE (type));
else
dbxout_type_index (type);
stabstr_C (';');
stabstr_O (low);
stabstr_C (';');
stabstr_O (high);
stabstr_C (';');
}
else
/* Output other integer types as subranges of `int'. */
dbxout_range_type (type, low, high);
}
break;
case REAL_TYPE:
case FIXED_POINT_TYPE:
/* This used to say `r1' and we used to take care
to make sure that `int' was type number 1. */
stabstr_C ('r');
dbxout_type_index (integer_type_node);
stabstr_C (';');
stabstr_D (int_size_in_bytes (type));
stabstr_S (";0;");
break;
case BOOLEAN_TYPE:
if (use_gnu_debug_info_extensions)
{
stabstr_S ("@s");
stabstr_D (BITS_PER_UNIT * int_size_in_bytes (type));
stabstr_S (";-16;");
}
else /* Define as enumeral type (False, True) */
stabstr_S ("eFalse:0,True:1,;");
break;
case COMPLEX_TYPE:
/* Differs from the REAL_TYPE by its new data type number.
R3 is NF_COMPLEX. We don't try to use any of the other NF_*
codes since gdb doesn't care anyway. */
if (TREE_CODE (TREE_TYPE (type)) == REAL_TYPE)
{
stabstr_S ("R3;");
stabstr_D (2 * int_size_in_bytes (TREE_TYPE (type)));
stabstr_S (";0;");
}
else
{
/* Output a complex integer type as a structure,
pending some other way to do it. */
stabstr_C ('s');
stabstr_D (int_size_in_bytes (type));
stabstr_S ("real:");
dbxout_type (TREE_TYPE (type), 0);
stabstr_S (",0,");
stabstr_D (TYPE_PRECISION (TREE_TYPE (type)));
stabstr_S (";imag:");
dbxout_type (TREE_TYPE (type), 0);
stabstr_C (',');
stabstr_D (TYPE_PRECISION (TREE_TYPE (type)));
stabstr_C (',');
stabstr_D (TYPE_PRECISION (TREE_TYPE (type)));
stabstr_S (";;");
}
break;
case ARRAY_TYPE:
/* Make arrays of packed bits look like bitstrings for chill. */
if (TYPE_PACKED (type) && use_gnu_debug_info_extensions)
{
stabstr_S ("@s");
stabstr_D (BITS_PER_UNIT * int_size_in_bytes (type));
stabstr_S (";@S;S");
dbxout_type (TYPE_DOMAIN (type), 0);
break;
}
/* Output "a" followed by a range type definition
for the index type of the array
followed by a reference to the target-type.
ar1;0;N;M for a C array of type M and size N+1. */
/* Check if a character string type, which in Chill is
different from an array of characters. */
if (TYPE_STRING_FLAG (type) && use_gnu_debug_info_extensions)
{
stabstr_S ("@S;");
}
tem = TYPE_DOMAIN (type);
if (tem == NULL)
{
stabstr_S ("ar");
dbxout_type_index (integer_type_node);
stabstr_S (";0;-1;");
}
else
{
stabstr_C ('a');
dbxout_range_type (tem, TYPE_MIN_VALUE (tem), TYPE_MAX_VALUE (tem));
}
dbxout_type (TREE_TYPE (type), 0);
break;
case VECTOR_TYPE:
/* Make vectors look like an array. */
if (use_gnu_debug_info_extensions)
stabstr_S ("@V;");
/* Output "a" followed by a range type definition
for the index type of the array
followed by a reference to the target-type.
ar1;0;N;M for a C array of type M and size N+1. */
stabstr_C ('a');
dbxout_range_type (integer_type_node, size_zero_node,
size_int (TYPE_VECTOR_SUBPARTS (type) - 1));
dbxout_type (TREE_TYPE (type), 0);
break;
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
{
tree binfo = TYPE_BINFO (type);
/* Output a structure type. We must use the same test here as we
use in the DBX_NO_XREFS case above. */
if ((TYPE_NAME (type) != 0
&& ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_IGNORED_P (TYPE_NAME (type)))
&& !full)
|| !COMPLETE_TYPE_P (type)
/* No way in DBX fmt to describe a variable size. */
|| ! tree_fits_uhwi_p (TYPE_SIZE (type)))
{
/* If the type is just a cross reference, output one
and mark the type as partially described.
If it later becomes defined, we will output
its real definition.
If the type has a name, don't nest its definition within
another type's definition; instead, output an xref
and let the definition come when the name is defined. */
stabstr_S ((TREE_CODE (type) == RECORD_TYPE) ? "xs" : "xu");
if (TYPE_IDENTIFIER (type))
{
/* Note that the C frontend creates for anonymous variable
length records/unions TYPE_NAME with DECL_NAME NULL. */
dbxout_type_name (type);
}
else
{
stabstr_S ("$$");
stabstr_D (anonymous_type_number++);
}
stabstr_C (':');
typevec[TYPE_SYMTAB_ADDRESS (type)].status = TYPE_XREF;
break;
}
/* Identify record or union, and print its size. */
stabstr_C ((TREE_CODE (type) == RECORD_TYPE) ? 's' : 'u');
stabstr_D (int_size_in_bytes (type));
if (binfo)
{
int i;
tree child;
vec<tree, va_gc> *accesses = BINFO_BASE_ACCESSES (binfo);
if (use_gnu_debug_info_extensions)
{
if (BINFO_N_BASE_BINFOS (binfo))
{
stabstr_C ('!');
stabstr_U (BINFO_N_BASE_BINFOS (binfo));
stabstr_C (',');
}
}
for (i = 0; BINFO_BASE_ITERATE (binfo, i, child); i++)
{
tree access = (accesses ? (*accesses)[i] : access_public_node);
if (use_gnu_debug_info_extensions)
{
stabstr_C (BINFO_VIRTUAL_P (child) ? '1' : '0');
stabstr_C (access == access_public_node ? '2' :
access == access_protected_node
? '1' :'0');
if (BINFO_VIRTUAL_P (child)
&& (lang_GNU_CXX ()
|| strcmp (lang_hooks.name, "GNU Objective-C++") == 0))
/* For a virtual base, print the (negative)
offset within the vtable where we must look
to find the necessary adjustment. */
stabstr_D
(tree_to_shwi (BINFO_VPTR_FIELD (child))
* BITS_PER_UNIT);
else
stabstr_D (tree_to_shwi (BINFO_OFFSET (child))
* BITS_PER_UNIT);
stabstr_C (',');
dbxout_type (BINFO_TYPE (child), 0);
stabstr_C (';');
}
else
{
/* Print out the base class information with
fields which have the same names at the types
they hold. */
dbxout_type_name (BINFO_TYPE (child));
stabstr_C (':');
dbxout_type (BINFO_TYPE (child), full);
stabstr_C (',');
stabstr_D (tree_to_shwi (BINFO_OFFSET (child))
* BITS_PER_UNIT);
stabstr_C (',');
stabstr_D
(tree_to_shwi (TYPE_SIZE (BINFO_TYPE (child)))
* BITS_PER_UNIT);
stabstr_C (';');
}
}
}
}
/* Write out the field declarations. */
dbxout_type_fields (type);
if (use_gnu_debug_info_extensions && TYPE_METHODS (type) != NULL_TREE)
{
dbxout_type_methods (type);
}
stabstr_C (';');
if (use_gnu_debug_info_extensions && TREE_CODE (type) == RECORD_TYPE
/* Avoid the ~ if we don't really need it--it confuses dbx. */
&& TYPE_VFIELD (type))
{
/* We need to write out info about what field this class
uses as its "main" vtable pointer field, because if this
field is inherited from a base class, GDB cannot necessarily
figure out which field it's using in time. */
stabstr_S ("~%");
dbxout_type (DECL_FCONTEXT (TYPE_VFIELD (type)), 0);
stabstr_C (';');
}
break;
case ENUMERAL_TYPE:
/* We must use the same test here as we use in the DBX_NO_XREFS case
above. We simplify it a bit since an enum will never have a variable
size. */
if ((TYPE_NAME (type) != 0
&& ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_IGNORED_P (TYPE_NAME (type)))
&& !full)
|| !COMPLETE_TYPE_P (type))
{
stabstr_S ("xe");
dbxout_type_name (type);
typevec[TYPE_SYMTAB_ADDRESS (type)].status = TYPE_XREF;
stabstr_C (':');
return;
}
if (use_gnu_debug_info_extensions
&& TYPE_PRECISION (type) != TYPE_PRECISION (integer_type_node))
{
stabstr_S ("@s");
stabstr_D (TYPE_PRECISION (type));
stabstr_C (';');
}
stabstr_C ('e');
for (tem = TYPE_VALUES (type); tem; tem = TREE_CHAIN (tem))
{
tree value = TREE_VALUE (tem);
stabstr_I (TREE_PURPOSE (tem));
stabstr_C (':');
if (TREE_CODE (value) == CONST_DECL)
value = DECL_INITIAL (value);
if (cst_and_fits_in_hwi (value))
stabstr_D (TREE_INT_CST_LOW (value));
else
stabstr_O (value);
stabstr_C (',');
if (TREE_CHAIN (tem) != 0)
CONTIN;
}
stabstr_C (';');
break;
case POINTER_TYPE:
stabstr_C ('*');
dbxout_type (TREE_TYPE (type), 0);
break;
case METHOD_TYPE:
if (use_gnu_debug_info_extensions)
{
stabstr_C ('#');
/* Write the argument types out longhand. */
dbxout_type (TYPE_METHOD_BASETYPE (type), 0);
stabstr_C (',');
dbxout_type (TREE_TYPE (type), 0);
dbxout_args (TYPE_ARG_TYPES (type));
stabstr_C (';');
}
else
/* Treat it as a function type. */
dbxout_type (TREE_TYPE (type), 0);
break;
case OFFSET_TYPE:
if (use_gnu_debug_info_extensions)
{
stabstr_C ('@');
dbxout_type (TYPE_OFFSET_BASETYPE (type), 0);
stabstr_C (',');
dbxout_type (TREE_TYPE (type), 0);
}
else
/* Should print as an int, because it is really just an offset. */
dbxout_type (integer_type_node, 0);
break;
case REFERENCE_TYPE:
if (use_gnu_debug_info_extensions)
{
stabstr_C ('&');
}
else
stabstr_C ('*');
dbxout_type (TREE_TYPE (type), 0);
break;
case FUNCTION_TYPE:
stabstr_C ('f');
dbxout_type (TREE_TYPE (type), 0);
break;
case POINTER_BOUNDS_TYPE:
/* No debug info for pointer bounds type supported yet. */
break;
default:
/* A C++ function with deduced return type can have a TEMPLATE_TYPE_PARM
named 'auto' in its type.
No debug info for TEMPLATE_TYPE_PARM type supported yet. */
if (lang_GNU_CXX ())
{
tree name = TYPE_IDENTIFIER (type);
if (name == get_identifier ("auto")
|| name == get_identifier ("decltype(auto)"))
break;
}
gcc_unreachable ();
}
}
/* Return nonzero if the given type represents an integer whose bounds
should be printed in octal format. */
static bool
print_int_cst_bounds_in_octal_p (tree type, tree low, tree high)
{
/* If we can use GDB extensions and the size is wider than a long
(the size used by GDB to read them) or we may have trouble writing
the bounds the usual way, write them in octal. Note the test is for
the *target's* size of "long", not that of the host. The host test
is just to make sure we can write it out in case the host wide int
is narrower than the target "long".
For unsigned types, we use octal if they are the same size or larger.
This is because we print the bounds as signed decimal, and hence they
can't span same size unsigned types. */
if (use_gnu_debug_info_extensions
&& low && TREE_CODE (low) == INTEGER_CST
&& high && TREE_CODE (high) == INTEGER_CST
&& (TYPE_PRECISION (type) > TYPE_PRECISION (integer_type_node)
|| ((TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
&& TYPE_UNSIGNED (type))
|| TYPE_PRECISION (type) > HOST_BITS_PER_WIDE_INT
|| (TYPE_PRECISION (type) == HOST_BITS_PER_WIDE_INT
&& TYPE_UNSIGNED (type))))
return TRUE;
else
return FALSE;
}
/* Output the name of type TYPE, with no punctuation.
Such names can be set up either by typedef declarations
or by struct, enum and union tags. */
static void
dbxout_type_name (tree type)
{
tree t = TYPE_NAME (type);
gcc_assert (t);
switch (TREE_CODE (t))
{
case IDENTIFIER_NODE:
break;
case TYPE_DECL:
t = DECL_NAME (t);
break;
default:
gcc_unreachable ();
}
stabstr_I (t);
}
/* Output leading leading struct or class names needed for qualifying
type whose scope is limited to a struct or class. */
static void
dbxout_class_name_qualifiers (tree decl)
{
tree context = decl_type_context (decl);
if (context != NULL_TREE
&& TREE_CODE (context) == RECORD_TYPE
&& TYPE_NAME (context) != 0
&& (TREE_CODE (TYPE_NAME (context)) == IDENTIFIER_NODE
|| (DECL_NAME (TYPE_NAME (context)) != 0)))
{
tree name = TYPE_NAME (context);
if (TREE_CODE (name) == TYPE_DECL)
{
dbxout_class_name_qualifiers (name);
name = DECL_NAME (name);
}
stabstr_I (name);
stabstr_S ("::");
}
}
/* This is a specialized subset of expand_expr for use by dbxout_symbol in
evaluating DECL_VALUE_EXPR. In particular, we stop if we find decls that
haven't been expanded, or if the expression is getting so complex we won't
be able to represent it in stabs anyway. Returns NULL on failure. */
static rtx
dbxout_expand_expr (tree expr)
{
switch (TREE_CODE (expr))
{
case VAR_DECL:
/* We can't handle emulated tls variables, because the address is an
offset to the return value of __emutls_get_address, and there is no
way to express that in stabs. Also, there are name mangling issues
here. We end up with references to undefined symbols if we don't
disable debug info for these variables. */
if (!targetm.have_tls && DECL_THREAD_LOCAL_P (expr))
return NULL;
if (TREE_STATIC (expr)
&& !TREE_ASM_WRITTEN (expr)
&& !DECL_HAS_VALUE_EXPR_P (expr)
&& !TREE_PUBLIC (expr)
&& DECL_RTL_SET_P (expr)
&& MEM_P (DECL_RTL (expr)))
{
/* If this is a var that might not be actually output,
return NULL, otherwise stabs might reference an undefined
symbol. */
varpool_node *node = varpool_node::get (expr);
if (!node || !node->definition)
return NULL;
}
/* FALLTHRU */
case PARM_DECL:
case RESULT_DECL:
if (DECL_HAS_VALUE_EXPR_P (expr))
return dbxout_expand_expr (DECL_VALUE_EXPR (expr));
/* FALLTHRU */
case CONST_DECL:
return DECL_RTL_IF_SET (expr);
case INTEGER_CST:
return expand_expr (expr, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
case COMPONENT_REF:
case ARRAY_REF:
case ARRAY_RANGE_REF:
case BIT_FIELD_REF:
{
machine_mode mode;
HOST_WIDE_INT bitsize, bitpos;
tree offset, tem;
int volatilep = 0, unsignedp = 0;
rtx x;
tem = get_inner_reference (expr, &bitsize, &bitpos, &offset,
&mode, &unsignedp, &volatilep, true);
x = dbxout_expand_expr (tem);
if (x == NULL || !MEM_P (x))
return NULL;
if (offset != NULL)
{
if (!tree_fits_shwi_p (offset))
return NULL;
x = adjust_address_nv (x, mode, tree_to_shwi (offset));
}
if (bitpos != 0)
x = adjust_address_nv (x, mode, bitpos / BITS_PER_UNIT);
return x;
}
default:
return NULL;
}
}
/* Helper function for output_used_types. Queue one entry from the
used types hash to be output. */
bool
output_used_types_helper (tree const &type, vec<tree> *types_p)
{
if ((TREE_CODE (type) == RECORD_TYPE
|| TREE_CODE (type) == UNION_TYPE
|| TREE_CODE (type) == QUAL_UNION_TYPE
|| TREE_CODE (type) == ENUMERAL_TYPE)
&& TYPE_STUB_DECL (type)
&& DECL_P (TYPE_STUB_DECL (type))
&& ! DECL_IGNORED_P (TYPE_STUB_DECL (type)))
types_p->quick_push (TYPE_STUB_DECL (type));
else if (TYPE_NAME (type)
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
types_p->quick_push (TYPE_NAME (type));
return true;
}
/* This is a qsort callback which sorts types and declarations into a
predictable order (types, then declarations, sorted by UID
within). */
static int
output_types_sort (const void *pa, const void *pb)
{
const tree lhs = *((const tree *)pa);
const tree rhs = *((const tree *)pb);
if (TYPE_P (lhs))
{
if (TYPE_P (rhs))
return TYPE_UID (lhs) - TYPE_UID (rhs);
else
return 1;
}
else
{
if (TYPE_P (rhs))
return -1;
else
return DECL_UID (lhs) - DECL_UID (rhs);
}
}
/* Force all types used by this function to be output in debug
information. */
static void
output_used_types (void)
{
if (cfun && cfun->used_types_hash)
{
vec<tree> types;
int i;
tree type;
types.create (cfun->used_types_hash->elements ());
cfun->used_types_hash->traverse<vec<tree> *, output_used_types_helper>
(&types);
/* Sort by UID to prevent dependence on hash table ordering. */
types.qsort (output_types_sort);
FOR_EACH_VEC_ELT (types, i, type)
debug_queue_symbol (type);
types.release ();
}
}
/* Output a .stabs for the symbol defined by DECL,
which must be a ..._DECL node in the normal namespace.
It may be a CONST_DECL, a FUNCTION_DECL, a PARM_DECL or a VAR_DECL.
LOCAL is nonzero if the scope is less than the entire file.
Return 1 if a stabs might have been emitted. */
int
dbxout_symbol (tree decl, int local ATTRIBUTE_UNUSED)
{
tree type = TREE_TYPE (decl);
tree context = NULL_TREE;
int result = 0;
rtx decl_rtl;
/* "Intercept" dbxout_symbol() calls like we do all debug_hooks. */
++debug_nesting;
/* Ignore nameless syms, but don't ignore type tags. */
if ((DECL_NAME (decl) == 0 && TREE_CODE (decl) != TYPE_DECL)
|| DECL_IGNORED_P (decl))
DBXOUT_DECR_NESTING_AND_RETURN (0);
/* If we are to generate only the symbols actually used then such
symbol nodes are flagged with TREE_USED. Ignore any that
aren't flagged as TREE_USED. */
if (flag_debug_only_used_symbols
&& (!TREE_USED (decl)
&& (TREE_CODE (decl) != VAR_DECL || !DECL_INITIAL (decl))))
DBXOUT_DECR_NESTING_AND_RETURN (0);
/* If dbxout_init has not yet run, queue this symbol for later. */
if (!typevec)
{
preinit_symbols = tree_cons (0, decl, preinit_symbols);
DBXOUT_DECR_NESTING_AND_RETURN (0);
}
if (flag_debug_only_used_symbols)
{
tree t;
/* We now have a used symbol. We need to generate the info for
the symbol's type in addition to the symbol itself. These
type symbols are queued to be generated after were done with
the symbol itself (otherwise they would fight over the
stabstr obstack).
Note, because the TREE_TYPE(type) might be something like a
pointer to a named type we need to look for the first name
we see following the TREE_TYPE chain. */
t = type;
while (POINTER_TYPE_P (t))
t = TREE_TYPE (t);
/* RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, and ENUMERAL_TYPE
need special treatment. The TYPE_STUB_DECL field in these
types generally represents the tag name type we want to
output. In addition there could be a typedef type with
a different name. In that case we also want to output
that. */
if (TREE_CODE (t) == RECORD_TYPE
|| TREE_CODE (t) == UNION_TYPE
|| TREE_CODE (t) == QUAL_UNION_TYPE
|| TREE_CODE (t) == ENUMERAL_TYPE)
{
if (TYPE_STUB_DECL (t)
&& TYPE_STUB_DECL (t) != decl
&& DECL_P (TYPE_STUB_DECL (t))
&& ! DECL_IGNORED_P (TYPE_STUB_DECL (t)))
{
debug_queue_symbol (TYPE_STUB_DECL (t));
if (TYPE_NAME (t)
&& TYPE_NAME (t) != TYPE_STUB_DECL (t)
&& TYPE_NAME (t) != decl
&& DECL_P (TYPE_NAME (t)))
debug_queue_symbol (TYPE_NAME (t));
}
}
else if (TYPE_NAME (t)
&& TYPE_NAME (t) != decl
&& DECL_P (TYPE_NAME (t)))
debug_queue_symbol (TYPE_NAME (t));
}
emit_pending_bincls_if_required ();
switch (TREE_CODE (decl))
{
case CONST_DECL:
/* Enum values are defined by defining the enum type. */
break;
case FUNCTION_DECL:
decl_rtl = DECL_RTL_IF_SET (decl);
if (!decl_rtl)
DBXOUT_DECR_NESTING_AND_RETURN (0);
if (DECL_EXTERNAL (decl))
break;
/* Don't mention a nested function under its parent. */
context = decl_function_context (decl);
if (context == current_function_decl)
break;
/* Don't mention an inline instance of a nested function. */
if (context && DECL_FROM_INLINE (decl))
break;
if (!MEM_P (decl_rtl)
|| GET_CODE (XEXP (decl_rtl, 0)) != SYMBOL_REF)
break;
if (flag_debug_only_used_symbols)
output_used_types ();
dbxout_begin_complex_stabs ();
stabstr_I (DECL_ASSEMBLER_NAME (decl));
stabstr_S (TREE_PUBLIC (decl) ? ":F" : ":f");
result = 1;
if (TREE_TYPE (type))
dbxout_type (TREE_TYPE (type), 0);
else
dbxout_type (void_type_node, 0);
/* For a nested function, when that function is compiled,
mention the containing function name
as well as (since dbx wants it) our own assembler-name. */
if (context != 0)
{
stabstr_C (',');
stabstr_I (DECL_ASSEMBLER_NAME (decl));
stabstr_C (',');
stabstr_I (DECL_NAME (context));
}
dbxout_finish_complex_stabs (decl, N_FUN, XEXP (decl_rtl, 0), 0, 0);
break;
case TYPE_DECL:
/* Don't output the same typedef twice.
And don't output what language-specific stuff doesn't want output. */
if (TREE_ASM_WRITTEN (decl) || TYPE_DECL_SUPPRESS_DEBUG (decl))
DBXOUT_DECR_NESTING_AND_RETURN (0);
/* Don't output typedefs for types with magic type numbers (XCOFF). */
#ifdef DBX_ASSIGN_FUNDAMENTAL_TYPE_NUMBER
{
int fundamental_type_number =
DBX_ASSIGN_FUNDAMENTAL_TYPE_NUMBER (decl);
if (fundamental_type_number != 0)
{
TREE_ASM_WRITTEN (decl) = 1;
TYPE_SYMTAB_ADDRESS (TREE_TYPE (decl)) = fundamental_type_number;
DBXOUT_DECR_NESTING_AND_RETURN (0);
}
}
#endif
FORCE_TEXT;
result = 1;
{
int tag_needed = 1;
int did_output = 0;
if (DECL_NAME (decl))
{
/* Nonzero means we must output a tag as well as a typedef. */
tag_needed = 0;
/* Handle the case of a C++ structure or union
where the TYPE_NAME is a TYPE_DECL
which gives both a typedef name and a tag. */
/* dbx requires the tag first and the typedef second. */
if ((TREE_CODE (type) == RECORD_TYPE
|| TREE_CODE (type) == UNION_TYPE
|| TREE_CODE (type) == QUAL_UNION_TYPE)
&& TYPE_NAME (type) == decl
&& !use_gnu_debug_info_extensions
&& !TREE_ASM_WRITTEN (TYPE_NAME (type))
/* Distinguish the implicit typedefs of C++
from explicit ones that might be found in C. */
&& DECL_ARTIFICIAL (decl)
/* Do not generate a tag for incomplete records. */
&& COMPLETE_TYPE_P (type)
/* Do not generate a tag for records of variable size,
since this type can not be properly described in the
DBX format, and it confuses some tools such as objdump. */
&& tree_fits_uhwi_p (TYPE_SIZE (type)))
{
tree name = TYPE_IDENTIFIER (type);
dbxout_begin_complex_stabs ();
stabstr_I (name);
stabstr_S (":T");
dbxout_type (type, 1);
dbxout_finish_complex_stabs (0, DBX_TYPE_DECL_STABS_CODE,
0, 0, 0);
}
dbxout_begin_complex_stabs ();
/* Output leading class/struct qualifiers. */
if (use_gnu_debug_info_extensions)
dbxout_class_name_qualifiers (decl);
/* Output typedef name. */
stabstr_I (DECL_NAME (decl));
stabstr_C (':');
/* Short cut way to output a tag also. */
if ((TREE_CODE (type) == RECORD_TYPE
|| TREE_CODE (type) == UNION_TYPE
|| TREE_CODE (type) == QUAL_UNION_TYPE)
&& TYPE_NAME (type) == decl
/* Distinguish the implicit typedefs of C++
from explicit ones that might be found in C. */
&& DECL_ARTIFICIAL (decl))
{
if (use_gnu_debug_info_extensions)
{
stabstr_C ('T');
TREE_ASM_WRITTEN (TYPE_NAME (type)) = 1;
}
}
stabstr_C ('t');
dbxout_type (type, 1);
dbxout_finish_complex_stabs (decl, DBX_TYPE_DECL_STABS_CODE,
0, 0, 0);
did_output = 1;
}
/* Don't output a tag if this is an incomplete type. This prevents
the sun4 Sun OS 4.x dbx from crashing. */
if (tag_needed && TYPE_NAME (type) != 0
&& (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE
|| (DECL_NAME (TYPE_NAME (type)) != 0))
&& COMPLETE_TYPE_P (type)
&& !TREE_ASM_WRITTEN (TYPE_NAME (type)))
{
/* For a TYPE_DECL with no name, but the type has a name,
output a tag.
This is what represents `struct foo' with no typedef. */
/* In C++, the name of a type is the corresponding typedef.
In C, it is an IDENTIFIER_NODE. */
tree name = TYPE_IDENTIFIER (type);
dbxout_begin_complex_stabs ();
stabstr_I (name);
stabstr_S (":T");
dbxout_type (type, 1);
dbxout_finish_complex_stabs (0, DBX_TYPE_DECL_STABS_CODE, 0, 0, 0);
did_output = 1;
}
/* If an enum type has no name, it cannot be referred to, but
we must output it anyway, to record the enumeration
constants. */
if (!did_output && TREE_CODE (type) == ENUMERAL_TYPE)
{
dbxout_begin_complex_stabs ();
/* Some debuggers fail when given NULL names, so give this a
harmless name of " " (Why not "(anon)"?). */
stabstr_S (" :T");
dbxout_type (type, 1);
dbxout_finish_complex_stabs (0, DBX_TYPE_DECL_STABS_CODE, 0, 0, 0);
}
/* Prevent duplicate output of a typedef. */
TREE_ASM_WRITTEN (decl) = 1;
break;
}
case PARM_DECL:
if (DECL_HAS_VALUE_EXPR_P (decl))
decl = DECL_VALUE_EXPR (decl);
/* PARM_DECLs go in their own separate chain and are output by
dbxout_reg_parms and dbxout_parms, except for those that are
disguised VAR_DECLs like Out parameters in Ada. */
gcc_assert (TREE_CODE (decl) == VAR_DECL);
/* ... fall through ... */
case RESULT_DECL:
case VAR_DECL:
/* Don't mention a variable that is external.
Let the file that defines it describe it. */
if (DECL_EXTERNAL (decl))
break;
/* If the variable is really a constant
and not written in memory, inform the debugger.
??? Why do we skip emitting the type and location in this case? */
if (TREE_STATIC (decl) && TREE_READONLY (decl)
&& DECL_INITIAL (decl) != 0
&& tree_fits_shwi_p (DECL_INITIAL (decl))
&& ! TREE_ASM_WRITTEN (decl)
&& (DECL_FILE_SCOPE_P (decl)
|| TREE_CODE (DECL_CONTEXT (decl)) == BLOCK
|| TREE_CODE (DECL_CONTEXT (decl)) == NAMESPACE_DECL)
&& TREE_PUBLIC (decl) == 0)
{
/* The sun4 assembler does not grok this. */
if (TREE_CODE (TREE_TYPE (decl)) == INTEGER_TYPE
|| TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
{
HOST_WIDE_INT ival = tree_to_shwi (DECL_INITIAL (decl));
dbxout_begin_complex_stabs ();
dbxout_symbol_name (decl, NULL, 'c');
stabstr_S ("=i");
stabstr_D (ival);
dbxout_finish_complex_stabs (0, N_LSYM, 0, 0, 0);
DBXOUT_DECR_NESTING;
return 1;
}
else
break;
}
/* else it is something we handle like a normal variable. */
decl_rtl = dbxout_expand_expr (decl);
if (!decl_rtl)
DBXOUT_DECR_NESTING_AND_RETURN (0);
if (!is_global_var (decl))
decl_rtl = eliminate_regs (decl_rtl, VOIDmode, NULL_RTX);
#ifdef LEAF_REG_REMAP
if (crtl->uses_only_leaf_regs)
leaf_renumber_regs_insn (decl_rtl);
#endif
result = dbxout_symbol_location (decl, type, 0, decl_rtl);
break;
default:
break;
}
DBXOUT_DECR_NESTING;
return result;
}
/* Output the stab for DECL, a VAR_DECL, RESULT_DECL or PARM_DECL.
Add SUFFIX to its name, if SUFFIX is not 0.
Describe the variable as residing in HOME
(usually HOME is DECL_RTL (DECL), but not always).
Returns 1 if the stab was really emitted. */
static int
dbxout_symbol_location (tree decl, tree type, const char *suffix, rtx home)
{
int letter = 0;
stab_code_type code;
rtx addr = 0;
int number = 0;
int regno = -1;
/* Don't mention a variable at all
if it was completely optimized into nothingness.
If the decl was from an inline function, then its rtl
is not identically the rtl that was used in this
particular compilation. */
if (GET_CODE (home) == SUBREG)
{
rtx value = home;
while (GET_CODE (value) == SUBREG)
value = SUBREG_REG (value);
if (REG_P (value))
{
if (REGNO (value) >= FIRST_PSEUDO_REGISTER)
return 0;
}
home = alter_subreg (&home, true);
}
if (REG_P (home))
{
regno = REGNO (home);
if (regno >= FIRST_PSEUDO_REGISTER)
return 0;
}
/* The kind-of-variable letter depends on where
the variable is and on the scope of its name:
G and N_GSYM for static storage and global scope,
S for static storage and file scope,
V for static storage and local scope,
for those two, use N_LCSYM if data is in bss segment,
N_STSYM if in data segment, N_FUN otherwise.
(We used N_FUN originally, then changed to N_STSYM
to please GDB. However, it seems that confused ld.
Now GDB has been fixed to like N_FUN, says Kingdon.)
no letter at all, and N_LSYM, for auto variable,
r and N_RSYM for register variable. */
if (MEM_P (home) && GET_CODE (XEXP (home, 0)) == SYMBOL_REF)
{
if (TREE_PUBLIC (decl))
{
int offs;
letter = 'G';
code = N_GSYM;
if (NULL != dbxout_common_check (decl, &offs))
{
letter = 'V';
addr = 0;
number = offs;
}
}
else
{
addr = XEXP (home, 0);
letter = decl_function_context (decl) ? 'V' : 'S';
/* Some ports can transform a symbol ref into a label ref,
because the symbol ref is too far away and has to be
dumped into a constant pool. Alternatively, the symbol
in the constant pool might be referenced by a different
symbol. */
if (GET_CODE (addr) == SYMBOL_REF
&& CONSTANT_POOL_ADDRESS_P (addr))
{
bool marked;
rtx tmp = get_pool_constant_mark (addr, &marked);
if (GET_CODE (tmp) == SYMBOL_REF)
{
addr = tmp;
if (CONSTANT_POOL_ADDRESS_P (addr))
get_pool_constant_mark (addr, &marked);
else
marked = true;
}
else if (GET_CODE (tmp) == LABEL_REF)
{
addr = tmp;
marked = true;
}
/* If all references to the constant pool were optimized
out, we just ignore the symbol. */
if (!marked)
return 0;
}
/* This should be the same condition as in assemble_variable, but
we don't have access to dont_output_data here. So, instead,
we rely on the fact that error_mark_node initializers always
end up in bss for C++ and never end up in bss for C. */
if (DECL_INITIAL (decl) == 0
|| (lang_GNU_CXX ()
&& DECL_INITIAL (decl) == error_mark_node))
{
int offs;
code = N_LCSYM;
if (NULL != dbxout_common_check (decl, &offs))
{
addr = 0;
number = offs;
letter = 'V';
code = N_GSYM;
}
}
else if (DECL_IN_TEXT_SECTION (decl))
/* This is not quite right, but it's the closest
of all the codes that Unix defines. */
code = DBX_STATIC_CONST_VAR_CODE;
else
{
/* Ultrix `as' seems to need this. */
#ifdef DBX_STATIC_STAB_DATA_SECTION
switch_to_section (data_section);
#endif
code = N_STSYM;
}
}
}
else if (regno >= 0)
{
letter = 'r';
code = N_RSYM;
number = DBX_REGISTER_NUMBER (regno);
}
else if (MEM_P (home)
&& (MEM_P (XEXP (home, 0))
|| (REG_P (XEXP (home, 0))
&& REGNO (XEXP (home, 0)) != HARD_FRAME_POINTER_REGNUM
&& REGNO (XEXP (home, 0)) != STACK_POINTER_REGNUM
#if !HARD_FRAME_POINTER_IS_ARG_POINTER
&& REGNO (XEXP (home, 0)) != ARG_POINTER_REGNUM
#endif
)))
/* If the value is indirect by memory or by a register
that isn't the frame pointer
then it means the object is variable-sized and address through
that register or stack slot. DBX has no way to represent this
so all we can do is output the variable as a pointer.
If it's not a parameter, ignore it. */
{
if (REG_P (XEXP (home, 0)))
{
letter = 'r';
code = N_RSYM;
if (REGNO (XEXP (home, 0)) >= FIRST_PSEUDO_REGISTER)
return 0;
number = DBX_REGISTER_NUMBER (REGNO (XEXP (home, 0)));
}
else
{
code = N_LSYM;
/* RTL looks like (MEM (MEM (PLUS (REG...) (CONST_INT...)))).
We want the value of that CONST_INT. */
number = DEBUGGER_AUTO_OFFSET (XEXP (XEXP (home, 0), 0));
}
/* Effectively do build_pointer_type, but don't cache this type,
since it might be temporary whereas the type it points to
might have been saved for inlining. */
/* Don't use REFERENCE_TYPE because dbx can't handle that. */
type = make_node (POINTER_TYPE);
TREE_TYPE (type) = TREE_TYPE (decl);
}
else if (MEM_P (home)
&& REG_P (XEXP (home, 0)))
{
code = N_LSYM;
number = DEBUGGER_AUTO_OFFSET (XEXP (home, 0));
}
else if (MEM_P (home)
&& GET_CODE (XEXP (home, 0)) == PLUS
&& CONST_INT_P (XEXP (XEXP (home, 0), 1)))
{
code = N_LSYM;
/* RTL looks like (MEM (PLUS (REG...) (CONST_INT...)))
We want the value of that CONST_INT. */
number = DEBUGGER_AUTO_OFFSET (XEXP (home, 0));
}
else if (MEM_P (home)
&& GET_CODE (XEXP (home, 0)) == CONST)
{
/* Handle an obscure case which can arise when optimizing and
when there are few available registers. (This is *always*
the case for i386/i486 targets). The RTL looks like
(MEM (CONST ...)) even though this variable is a local `auto'
or a local `register' variable. In effect, what has happened
is that the reload pass has seen that all assignments and
references for one such a local variable can be replaced by
equivalent assignments and references to some static storage
variable, thereby avoiding the need for a register. In such
cases we're forced to lie to debuggers and tell them that
this variable was itself `static'. */
int offs;
code = N_LCSYM;
letter = 'V';
if (NULL == dbxout_common_check (decl, &offs))
addr = XEXP (XEXP (home, 0), 0);
else
{
addr = 0;
number = offs;
code = N_GSYM;
}
}
else if (GET_CODE (home) == CONCAT)
{
tree subtype;
/* If TYPE is not a COMPLEX_TYPE (it might be a RECORD_TYPE,
for example), then there is no easy way to figure out
what SUBTYPE should be. So, we give up. */
if (TREE_CODE (type) != COMPLEX_TYPE)
return 0;
subtype = TREE_TYPE (type);
/* If the variable's storage is in two parts,
output each as a separate stab with a modified name. */
if (WORDS_BIG_ENDIAN)
dbxout_symbol_location (decl, subtype, "$imag", XEXP (home, 0));
else
dbxout_symbol_location (decl, subtype, "$real", XEXP (home, 0));
if (WORDS_BIG_ENDIAN)
dbxout_symbol_location (decl, subtype, "$real", XEXP (home, 1));
else
dbxout_symbol_location (decl, subtype, "$imag", XEXP (home, 1));
return 1;
}
else
/* Address might be a MEM, when DECL is a variable-sized object.
Or it might be const0_rtx, meaning previous passes
want us to ignore this variable. */
return 0;
/* Ok, start a symtab entry and output the variable name. */
emit_pending_bincls_if_required ();
FORCE_TEXT;
#ifdef DBX_STATIC_BLOCK_START
DBX_STATIC_BLOCK_START (asm_out_file, code);
#endif
dbxout_begin_complex_stabs_noforcetext ();
dbxout_symbol_name (decl, suffix, letter);
dbxout_type (type, 0);
dbxout_finish_complex_stabs (decl, code, addr, 0, number);
#ifdef DBX_STATIC_BLOCK_END
DBX_STATIC_BLOCK_END (asm_out_file, code);
#endif
return 1;
}
/* Output the symbol name of DECL for a stabs, with suffix SUFFIX.
Then output LETTER to indicate the kind of location the symbol has. */
static void
dbxout_symbol_name (tree decl, const char *suffix, int letter)
{
tree name;
if (DECL_CONTEXT (decl)
&& (TYPE_P (DECL_CONTEXT (decl))
|| TREE_CODE (DECL_CONTEXT (decl)) == NAMESPACE_DECL))
/* One slight hitch: if this is a VAR_DECL which is a class member
or a namespace member, we must put out the mangled name instead of the
DECL_NAME. Note also that static member (variable) names DO NOT begin
with underscores in .stabs directives. */
name = DECL_ASSEMBLER_NAME (decl);
else
/* ...but if we're function-local, we don't want to include the junk
added by ASM_FORMAT_PRIVATE_NAME. */
name = DECL_NAME (decl);
if (name)
stabstr_I (name);
else
stabstr_S ("(anon)");
if (suffix)
stabstr_S (suffix);
stabstr_C (':');
if (letter)
stabstr_C (letter);
}
/* Output the common block name for DECL in a stabs.
Symbols in global common (.comm) get wrapped with an N_BCOMM/N_ECOMM pair
around each group of symbols in the same .comm area. The N_GSYM stabs
that are emitted only contain the offset in the common area. This routine
emits the N_BCOMM and N_ECOMM stabs. */
static void
dbxout_common_name (tree decl, const char *name, stab_code_type op)
{
dbxout_begin_complex_stabs ();
stabstr_S (name);
dbxout_finish_complex_stabs (decl, op, NULL_RTX, NULL, 0);
}
/* Check decl to determine whether it is a VAR_DECL destined for storage in a
common area. If it is, the return value will be a non-null string giving
the name of the common storage block it will go into. If non-null, the
value is the offset into the common block for that symbol's storage. */
static const char *
dbxout_common_check (tree decl, int *value)
{
rtx home;
rtx sym_addr;
const char *name = NULL;
/* If the decl isn't a VAR_DECL, or if it isn't static, or if
it does not have a value (the offset into the common area), or if it
is thread local (as opposed to global) then it isn't common, and shouldn't
be handled as such.
??? DECL_THREAD_LOCAL_P check prevents problems with improper .stabs
for thread-local symbols. Can be handled via same mechanism as used
in dwarf2out.c. */
if (TREE_CODE (decl) != VAR_DECL
|| !TREE_STATIC (decl)
|| !DECL_HAS_VALUE_EXPR_P (decl)
|| DECL_THREAD_LOCAL_P (decl)
|| !is_fortran ())
return NULL;
home = DECL_RTL (decl);
if (home == NULL_RTX || GET_CODE (home) != MEM)
return NULL;
sym_addr = dbxout_expand_expr (DECL_VALUE_EXPR (decl));
if (sym_addr == NULL_RTX || GET_CODE (sym_addr) != MEM)
return NULL;
sym_addr = XEXP (sym_addr, 0);
if (GET_CODE (sym_addr) == CONST)
sym_addr = XEXP (sym_addr, 0);
if ((GET_CODE (sym_addr) == SYMBOL_REF || GET_CODE (sym_addr) == PLUS)
&& DECL_INITIAL (decl) == 0)
{
/* We have a sym that will go into a common area, meaning that it
will get storage reserved with a .comm/.lcomm assembler pseudo-op.
Determine name of common area this symbol will be an offset into,
and offset into that area. Also retrieve the decl for the area
that the symbol is offset into. */
tree cdecl = NULL;
switch (GET_CODE (sym_addr))
{
case PLUS:
if (CONST_INT_P (XEXP (sym_addr, 0)))
{
name =
targetm.strip_name_encoding (XSTR (XEXP (sym_addr, 1), 0));
*value = INTVAL (XEXP (sym_addr, 0));
cdecl = SYMBOL_REF_DECL (XEXP (sym_addr, 1));
}
else
{
name =
targetm.strip_name_encoding (XSTR (XEXP (sym_addr, 0), 0));