+/* Output dbx-format symbol table information from GNU compiler.
+ Copyright (C) 1987, 1988 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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 1, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* 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 "tree.h"
+#include "rtl.h"
+#include "flags.h"
+#include <stdio.h>
+
+/* Typical USG systems don't have stab.h, and they also have
+ no use for DBX-format debugging info. */
+
+#ifdef DBX_DEBUGGING_INFO
+
+#ifdef DEBUG_SYMS_TEXT
+#define FORCE_TEXT text_section ();
+#else
+#define FORCE_TEXT
+#endif
+
+#ifdef USG
+#include "stab.h" /* If doing DBX on sysV, use our own stab.h. */
+#else
+#include <stab.h> /* On BSD, use the system's stab.h. */
+#endif /* not USG */
+
+/* Stream for writing to assembler file. */
+
+static FILE *asmfile;
+
+enum typestatus {TYPE_UNSEEN, TYPE_XREF, TYPE_DEFINED};
+
+/* Vector recording the status of describing 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.
+ The vector element says whether we have yet output
+ the definition of the type. TYPE_XREF says we have
+ output it as a cross-reference only. */
+
+enum typestatus *typevec;
+
+/* Number of elements of space allocated in `typevec'. */
+
+static 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 int next_type_number;
+
+/* In dbx output, we must assign symbol-blocks id numbers
+ in the order in which their beginnings are encountered.
+ We output debugging info that refers to the beginning and
+ end of the ranges of code in each block
+ with assembler labels LBBn and LBEn, where n is the block number.
+ The labels are generated in final, which assigns numbers to the
+ blocks in the same way. */
+
+static int next_block_number;
+
+/* These variables are for dbxout_symbol to communicate to
+ dbxout_finish_symbol.
+ current_sym_code is the symbol-type-code, a symbol N_... define in stab.h.
+ current_sym_value and current_sym_addr are two ways to address the
+ value to store in the symtab entry.
+ current_sym_addr if nonzero represents the value as an rtx.
+ If that is zero, current_sym_value is used. This is used
+ when the value is an offset (such as for auto variables,
+ register variables and parms). */
+
+static int current_sym_code;
+static int current_sym_value;
+static rtx current_sym_addr;
+
+/* Number of chars of symbol-description generated so far for the
+ current symbol. Used by CHARS and CONTIN. */
+
+static int current_sym_nchars;
+
+/* Report having output N chars of the current symbol-description. */
+
+#define CHARS(N) (current_sym_nchars += (N))
+
+/* Break the current symbol-description, generating a continuation,
+ if it has become long. */
+
+#ifndef DBX_CONTIN_LENGTH
+#define DBX_CONTIN_LENGTH 80
+#endif
+
+#if DBX_CONTIN_LENGTH > 0
+#define CONTIN \
+ do {if (current_sym_nchars > DBX_CONTIN_LENGTH) dbxout_continue ();} while (0)
+#else
+#define CONTIN
+#endif
+
+void dbxout_types ();
+void dbxout_tags ();
+void dbxout_args ();
+void dbxout_symbol ();
+static void dbxout_type_name ();
+static void dbxout_type ();
+static void dbxout_finish_symbol ();
+static void dbxout_continue ();
+\f
+/* At the beginning of compilation, start writing the symbol table.
+ Initialize `typevec' and output the standard data types of C. */
+
+void
+dbxout_init (asm_file, input_file_name)
+ FILE *asm_file;
+ char *input_file_name;
+{
+ asmfile = asm_file;
+
+ typevec_len = 100;
+ typevec = (enum typestatus *) xmalloc (typevec_len * sizeof typevec[0]);
+ bzero (typevec, typevec_len * sizeof typevec[0]);
+
+ /* Used to put `Ltext:' before the reference, but that loses on sun 4. */
+ fprintf (asmfile,
+ "\t.stabs \"%s\",%d,0,0,Ltext\nLtext:\n",
+ input_file_name, N_SO);
+
+ next_type_number = 1;
+ next_block_number = 2;
+
+ /* Make sure that types `int' and `char' have numbers 1 and 2.
+ Definitions of other integer types will refer to those numbers. */
+
+ dbxout_symbol (TYPE_NAME (integer_type_node), 0);
+ dbxout_symbol (TYPE_NAME (char_type_node), 0);
+
+ /* Get all permanent types not yet gotten, and output them. */
+
+ dbxout_types (get_permanent_types ());
+}
+
+/* Continue a symbol-description that gets too big.
+ End one symbol table entry with a double-backslash
+ and start a new one, eventually producing something like
+ .stabs "start......\\",code,0,value
+ .stabs "...rest",code,0,value */
+
+static void
+dbxout_continue ()
+{
+#ifdef DBX_CONTIN_CHAR
+ fprintf (asmfile, "%c", DBX_CONTIN_CHAR);
+#else
+ fprintf (asmfile, "\\\\");
+#endif
+ dbxout_finish_symbol ();
+ fprintf (asmfile, ".stabs \"");
+ current_sym_nchars = 0;
+}
+\f
+/* 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 (type, full)
+ tree type;
+ int full;
+{
+ register tree tem;
+
+ /* 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
+ type = TYPE_MAIN_VARIANT (type);
+
+ 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 = (enum typestatus *) xrealloc (typevec, typevec_len * 2 * sizeof typevec[0]);
+ bzero (typevec + typevec_len, typevec_len * sizeof typevec[0]);
+ typevec_len *= 2;
+ }
+ }
+
+ /* Output the number of this type, to refer to it. */
+ fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
+ CHARS (3);
+
+ /* If this type's definition has been output or is now being output,
+ that is all. */
+
+ switch (typevec[TYPE_SYMTAB_ADDRESS (type)])
+ {
+ case TYPE_UNSEEN:
+ break;
+ case TYPE_XREF:
+ if (! full)
+ 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 (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
+ || TREE_CODE (type) == ENUMERAL_TYPE)
+
+ if ((TYPE_NAME (type) != 0 && !full)
+ || TYPE_SIZE (type) == 0)
+ {
+ typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
+ return;
+ }
+#endif
+
+ /* Output a definition now. */
+
+ fprintf (asmfile, "=");
+ CHARS (1);
+
+ /* 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)] = TYPE_DEFINED;
+
+ switch (TREE_CODE (type))
+ {
+ case VOID_TYPE:
+ /* For a void type, just define it as itself; ie, "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. */
+ fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
+ CHARS (3);
+ break;
+
+ case INTEGER_TYPE:
+ if (type == char_type_node && ! TREE_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. */
+ fprintf (asmfile, "r2;0;127;");
+ else
+ /* Output other integer types as subranges of `int'. */
+ fprintf (asmfile, "r1;%d;%d;",
+ TREE_INT_CST_LOW (TYPE_MIN_VALUE (type)),
+ TREE_INT_CST_LOW (TYPE_MAX_VALUE (type)));
+ CHARS (25);
+ break;
+
+ case REAL_TYPE:
+ /* This must be magic. */
+ fprintf (asmfile, "r1;%d;0;",
+ TREE_INT_CST_LOW (size_in_bytes (type)));
+ CHARS (16);
+ break;
+
+ case ARRAY_TYPE:
+ /* 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 an array of type M and size N. */
+ fprintf (asmfile, "ar1;0;%d;",
+ (TYPE_DOMAIN (type)
+ ? TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))
+ : -1));
+ CHARS (17);
+ dbxout_type (TREE_TYPE (type), 0);
+ break;
+
+ case RECORD_TYPE:
+ case UNION_TYPE:
+ /* Output a structure type. */
+ if ((TYPE_NAME (type) != 0 && !full)
+ || TYPE_SIZE (type) == 0)
+ {
+ /* 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. */
+ fprintf (asmfile, (TREE_CODE (type) == RECORD_TYPE) ? "xs" : "xu");
+ CHARS (3);
+#if 0 /* This assertion is legitimately false in C++. */
+ /* We shouldn't be outputting a reference to a type before its
+ definition unless the type has a tag name.
+ A typedef name without a tag name should be impossible. */
+ if (TREE_CODE (TYPE_NAME (type)) != IDENTIFIER_NODE)
+ abort ();
+#endif
+ dbxout_type_name (type);
+ fprintf (asmfile, ":");
+ typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
+ break;
+ }
+ tem = size_in_bytes (type);
+ fprintf (asmfile, (TREE_CODE (type) == RECORD_TYPE) ? "s%d" : "u%d",
+ TREE_INT_CST_LOW (tem));
+
+ if (TYPE_BASETYPES (type) && use_gdb_dbx_extensions)
+ {
+ putc ('!', asmfile);
+ putc ((TREE_PUBLIC (TYPE_BASETYPES (type)) ? '2' : '0'),
+ asmfile);
+ dbxout_type (TREE_VALUE (TYPE_BASETYPES (type)), 0);
+ putc (',', asmfile);
+ CHARS (3);
+ }
+ CHARS (11);
+
+ for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
+ /* Output the name, type, position (in bits), size (in bits)
+ of each field. */
+ /* Omit here the nameless fields that are used to skip bits. */
+ if (DECL_NAME (tem) != 0)
+ {
+ /* Continue the line if necessary,
+ but not before the first field. */
+ if (tem != TYPE_FIELDS (type))
+ CONTIN;
+ fprintf (asmfile, "%s:", IDENTIFIER_POINTER (DECL_NAME (tem)));
+ CHARS (2 + IDENTIFIER_LENGTH (DECL_NAME (tem)));
+#ifdef TREE_PRIVATE
+ if (use_gdb_dbx_extensions
+ && (TREE_PRIVATE (tem) || TREE_PROTECTED (tem)
+ || TREE_CODE (tem) != FIELD_DECL))
+ {
+ putc ('/', asmfile);
+ putc ((TREE_PRIVATE (tem) ? '0'
+ : TREE_PROTECTED (tem) ? '1' : '2'),
+ asmfile);
+ CHARS (2);
+ if (TREE_CODE (tem) == FUNCTION_DECL)
+ {
+ putc (':', asmfile);
+ CHARS (1);
+ dbxout_type (TREE_TYPE (tem), 0); /* FUNCTION_TYPE */
+ dbxout_args (TYPE_ARG_TYPES (TREE_TYPE (tem)));
+#ifdef TREE_VIRTUAL
+ fprintf (asmfile, ":%s;%c",
+ XSTR (XEXP (DECL_RTL (tem), 0), 0),
+ TREE_VIRTUAL (tem) ? '*' : '.');
+#endif
+ CHARS (3 + strlen (XSTR (XEXP (DECL_RTL (tem), 0), 0)));
+ }
+ else
+ dbxout_type (TREE_TYPE (tem), 0);
+ }
+ else
+#endif
+ dbxout_type (TREE_TYPE (tem), 0);
+
+ if (TREE_CODE (tem) == VAR_DECL)
+ {
+ if (use_gdb_dbx_extensions)
+ {
+ fprintf (asmfile, ":%s",
+ XSTR (XEXP (DECL_RTL (tem), 0), 0));
+ CHARS (2 + strlen (XSTR (XEXP (DECL_RTL (tem), 0), 0)));
+ }
+ else
+ {
+ fprintf (asmfile, ",0,0;");
+ CHARS (5);
+ }
+ }
+ else
+ {
+ fprintf (asmfile, ",%d,%d;", DECL_OFFSET (tem),
+ (TREE_INT_CST_LOW (DECL_SIZE (tem))
+ * DECL_SIZE_UNIT (tem)));
+ CHARS (23);
+ }
+ }
+
+ putc (';', asmfile);
+ CHARS (1);
+ break;
+
+ case ENUMERAL_TYPE:
+ if ((TYPE_NAME (type) != 0 && !full)
+ || TYPE_SIZE (type) == 0)
+ {
+ fprintf (asmfile, "xe");
+ CHARS (3);
+ dbxout_type_name (type);
+ typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
+ fprintf (asmfile, ":");
+ return;
+ }
+ putc ('e', asmfile);
+ CHARS (1);
+ for (tem = TYPE_VALUES (type); tem; tem = TREE_CHAIN (tem))
+ {
+ fprintf (asmfile, "%s:%d,", IDENTIFIER_POINTER (TREE_PURPOSE (tem)),
+ TREE_INT_CST_LOW (TREE_VALUE (tem)));
+ CHARS (11 + IDENTIFIER_LENGTH (TREE_PURPOSE (tem)));
+ if (TREE_CHAIN (tem) != 0)
+ CONTIN;
+ }
+ putc (';', asmfile);
+ CHARS (1);
+ break;
+
+ case POINTER_TYPE:
+ putc ('*', asmfile);
+ CHARS (1);
+ dbxout_type (TREE_TYPE (type), 0);
+ break;
+
+ case METHOD_TYPE:
+ if (use_gdb_dbx_extensions)
+ {
+ putc ('@', asmfile);
+ CHARS (1);
+ dbxout_type (TYPE_METHOD_BASETYPE (type), 0);
+ putc (',', asmfile);
+ CHARS (1);
+ dbxout_type (TREE_TYPE (type), 0);
+ }
+ else
+ {
+ /* Treat it as a function type. */
+ dbxout_type (TREE_TYPE (type), 0);
+ }
+ break;
+
+ case OFFSET_TYPE:
+ if (use_gdb_dbx_extensions)
+ {
+ putc ('@', asmfile);
+ CHARS (1);
+ dbxout_type (TYPE_OFFSET_BASETYPE (type), 0);
+ putc (',', asmfile);
+ CHARS (1);
+ dbxout_type (TREE_TYPE (type), 0);
+ }
+ else
+ {
+ /* Treat it as a function type. */
+ dbxout_type (TREE_TYPE (type), 0);
+ }
+ break;
+
+ case REFERENCE_TYPE:
+ putc (use_gdb_dbx_extensions ? '&' : '*', asmfile);
+ CHARS (1);
+ dbxout_type (TREE_TYPE (type), 0);
+ break;
+
+ case FUNCTION_TYPE:
+ putc ('f', asmfile);
+ CHARS (1);
+ dbxout_type (TREE_TYPE (type), 0);
+ break;
+
+ default:
+ abort ();
+ }
+}
+
+/* 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 (type)
+ register tree type;
+{
+ tree t;
+ if (TYPE_NAME (type) == 0)
+ abort ();
+ if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
+ {
+ t = TYPE_NAME (type);
+ }
+ else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
+ {
+ t = DECL_NAME (TYPE_NAME (type));
+ }
+ else
+ abort ();
+
+ fprintf (asmfile, "%s", IDENTIFIER_POINTER (t));
+ CHARS (IDENTIFIER_LENGTH (t));
+}
+\f
+/* 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. */
+
+void
+dbxout_symbol (decl, local)
+ tree decl;
+ int local;
+{
+ int letter = 0;
+ tree type = TREE_TYPE (decl);
+
+ /* If global, first output all types and all
+ struct, enum and union tags that have been created
+ and not yet output. */
+
+ if (local == 0)
+ {
+ dbxout_tags (gettags ());
+ dbxout_types (get_permanent_types ());
+ }
+
+ current_sym_code = 0;
+ current_sym_value = 0;
+ current_sym_addr = 0;
+
+ /* The output will always start with the symbol name,
+ so count that always in the length-output-so-far. */
+
+ current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (decl));
+
+ switch (TREE_CODE (decl))
+ {
+ case CONST_DECL:
+ /* Enum values are defined by defining the enum type. */
+ break;
+
+ case FUNCTION_DECL:
+ if (DECL_RTL (decl) == 0)
+ return;
+ if (TREE_EXTERNAL (decl))
+ break;
+ if (GET_CODE (DECL_RTL (decl)) != MEM
+ || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
+ break;
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:%c",
+ IDENTIFIER_POINTER (DECL_NAME (decl)),
+ TREE_PUBLIC (decl) ? 'F' : 'f');
+
+ current_sym_code = N_FUN;
+ current_sym_addr = XEXP (DECL_RTL (decl), 0);
+
+ if (TREE_TYPE (TREE_TYPE (decl)))
+ dbxout_type (TREE_TYPE (TREE_TYPE (decl)), 0);
+ else
+ dbxout_type (void_type_node, 0);
+ dbxout_finish_symbol ();
+ break;
+
+ case TYPE_DECL:
+#if 0
+ /* This seems all wrong. Outputting most kinds of types gives no name
+ at all. A true definition gives no name; a cross-ref for a
+ structure can give the tag name, but not a type name.
+ It seems that no typedef name is defined by outputting a type. */
+
+ /* If this typedef name was defined by outputting the type,
+ don't duplicate it. */
+ if (typevec[TYPE_SYMTAB_ADDRESS (type)] == TYPE_DEFINED
+ && TYPE_NAME (TREE_TYPE (decl)) == decl)
+ return;
+#endif
+ /* Don't output the same typedef twice. */
+ if (TREE_ASM_WRITTEN (decl))
+ return;
+
+ /* Output typedef name. */
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:t",
+ IDENTIFIER_POINTER (DECL_NAME (decl)));
+
+ current_sym_code = N_LSYM;
+
+ dbxout_type (TREE_TYPE (decl), 1);
+ dbxout_finish_symbol ();
+
+ /* Prevent duplicate output of a typedef. */
+ TREE_ASM_WRITTEN (decl) = 1;
+ break;
+
+ case PARM_DECL:
+ /* Parm decls go in their own separate chains
+ and are output by dbxout_reg_parms and dbxout_parms. */
+ abort ();
+
+ case VAR_DECL:
+ if (DECL_RTL (decl) == 0)
+ return;
+ /* Don't mention a variable that is external.
+ Let the file that defines it describe it. */
+ if (TREE_EXTERNAL (decl))
+ break;
+
+ /* Don't mention a variable at all
+ if it was completely optimized into nothingness. */
+ if (GET_CODE (DECL_RTL (decl)) == REG
+ && (REGNO (DECL_RTL (decl)) < 0
+ || REGNO (DECL_RTL (decl)) >= FIRST_PSEUDO_REGISTER))
+ break;
+
+ /* 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 (GET_CODE (DECL_RTL (decl)) == MEM
+ && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
+ {
+ if (TREE_PUBLIC (decl))
+ {
+ letter = 'G';
+ current_sym_code = N_GSYM;
+ }
+ else
+ {
+ current_sym_addr = XEXP (DECL_RTL (decl), 0);
+
+ letter = TREE_PERMANENT (decl) ? 'S' : 'V';
+
+ if (!DECL_INITIAL (decl))
+ current_sym_code = N_LCSYM;
+ else if (TREE_READONLY (decl) && ! TREE_VOLATILE (decl))
+ /* This is not quite right, but it's the closest
+ of all the codes that Unix defines. */
+ current_sym_code = N_FUN;
+ else
+ {
+/* Ultrix `as' seems to need this. */
+#ifdef DBX_STATIC_STAB_DATA_SECTION
+ data_section ();
+#endif
+ current_sym_code = N_STSYM;
+ }
+ }
+ }
+ else if (GET_CODE (DECL_RTL (decl)) == REG)
+ {
+ letter = 'r';
+ current_sym_code = N_RSYM;
+ current_sym_value = DBX_REGISTER_NUMBER (REGNO (DECL_RTL (decl)));
+ }
+ else if (GET_CODE (DECL_RTL (decl)) == SUBREG)
+ {
+ rtx value = DECL_RTL (decl);
+ int offset = 0;
+ while (GET_CODE (value) == SUBREG)
+ {
+ offset += SUBREG_WORD (value);
+ value = SUBREG_REG (value);
+ }
+ letter = 'r';
+ current_sym_code = N_RSYM;
+ current_sym_value = DBX_REGISTER_NUMBER (REGNO (value) + offset);
+ }
+ else if (GET_CODE (DECL_RTL (decl)) == MEM
+ && (GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
+ || (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG
+ && REGNO (XEXP (DECL_RTL (decl), 0)) != FRAME_POINTER_REGNUM)))
+ /* 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.
+ (VAR_DECLs like this can be made by integrate.c.) */
+ {
+ if (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG)
+ {
+ letter = 'r';
+ current_sym_code = N_RSYM;
+ current_sym_value = DBX_REGISTER_NUMBER (REGNO (XEXP (DECL_RTL (decl), 0)));
+ }
+ else
+ {
+ current_sym_code = N_LSYM;
+ /* DECL_RTL looks like (MEM (MEM (PLUS (REG...) (CONST_INT...)))).
+ We want the value of that CONST_INT. */
+ current_sym_value = INTVAL (XEXP (XEXP (XEXP (DECL_RTL (decl), 0), 0), 1));
+ }
+
+ /* 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. */
+ type = make_node (POINTER_TYPE);
+ TREE_TYPE (type) = TREE_TYPE (decl);
+ }
+ else if (GET_CODE (DECL_RTL (decl)) == MEM
+ && GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG)
+ {
+ current_sym_code = N_LSYM;
+ current_sym_value = 0;
+ }
+ else if (GET_CODE (DECL_RTL (decl)) == MEM
+ && GET_CODE (XEXP (DECL_RTL (decl), 0)) == PLUS
+ && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 1)) == CONST_INT)
+ {
+ current_sym_code = N_LSYM;
+ /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...)))
+ We want the value of that CONST_INT. */
+ current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (decl), 0), 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. */
+ break;
+
+ /* Ok, start a symtab entry and output the variable name. */
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:",
+ IDENTIFIER_POINTER (DECL_NAME (decl)));
+ if (letter) putc (letter, asmfile);
+ dbxout_type (type, 0);
+ dbxout_finish_symbol ();
+ break;
+ }
+}
+
+static void
+dbxout_finish_symbol ()
+{
+ fprintf (asmfile, "\",%d,0,0,", current_sym_code);
+ if (current_sym_addr)
+ output_addr_const (asmfile, current_sym_addr);
+ else
+ fprintf (asmfile, "%d", current_sym_value);
+ putc ('\n', asmfile);
+}
+
+/* Output definitions of all the decls in a chain. */
+
+static void
+dbxout_syms (syms)
+ tree syms;
+{
+ while (syms)
+ {
+ dbxout_symbol (syms, 1);
+ syms = TREE_CHAIN (syms);
+ }
+}
+\f
+/* The following two functions output definitions of function parameters.
+ Each parameter gets a definition locating it in the parameter list.
+ Each parameter that is a register variable gets a second definition
+ locating it in the register.
+
+ Printing or argument lists in gdb uses the definitions that
+ locate in the parameter list. But reference to the variable in
+ expressions uses preferentially the definition as a register. */
+
+/* Output definitions, referring to storage in the parmlist,
+ of all the parms in PARMS, which is a chain of PARM_DECL nodes. */
+
+static void
+dbxout_parms (parms)
+ tree parms;
+{
+ for (; parms; parms = TREE_CHAIN (parms))
+ {
+ if (DECL_OFFSET (parms) >= 0)
+ {
+ current_sym_code = N_PSYM;
+ current_sym_value = DECL_OFFSET (parms) / BITS_PER_UNIT;
+ current_sym_addr = 0;
+ current_sym_nchars = 2 + strlen (IDENTIFIER_POINTER (DECL_NAME (parms)));
+
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:p",
+ IDENTIFIER_POINTER (DECL_NAME (parms)));
+
+ if (GET_CODE (DECL_RTL (parms)) == REG
+ && REGNO (DECL_RTL (parms)) >= 0
+ && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
+ dbxout_type (DECL_ARG_TYPE (parms), 0);
+ else
+ {
+ /* This is the case where the parm is passed as an int or double
+ and it is converted to a char, short or float and stored back
+ in the parmlist. In this case, describe the parm
+ with the variable's declared type, and adjust the address
+ if the least significant bytes (which we are using) are not
+ the first ones. */
+#ifdef BYTES_BIG_ENDIAN
+ if (TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
+ current_sym_value += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
+ - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
+#endif
+
+ if (GET_CODE (DECL_RTL (parms)) == MEM
+ && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
+ && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
+ && INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == current_sym_value)
+ dbxout_type (TREE_TYPE (parms), 0);
+ else
+ {
+ current_sym_value = DECL_OFFSET (parms) / BITS_PER_UNIT;
+ dbxout_type (DECL_ARG_TYPE (parms), 0);
+ }
+ }
+ dbxout_finish_symbol ();
+ }
+ /* Parm was passed in registers.
+ If it lives in a hard register, output a "regparm" symbol
+ for the register it lives in. */
+ else if (GET_CODE (DECL_RTL (parms)) == REG
+ && REGNO (DECL_RTL (parms)) >= 0
+ && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
+ {
+ current_sym_code = N_RSYM;
+ current_sym_value = DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms)));
+ current_sym_addr = 0;
+ current_sym_nchars = 2 + strlen (IDENTIFIER_POINTER (DECL_NAME (parms)));
+
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:P",
+ IDENTIFIER_POINTER (DECL_NAME (parms)));
+
+ dbxout_type (DECL_ARG_TYPE (parms), 0);
+ dbxout_finish_symbol ();
+ }
+ else if (GET_CODE (DECL_RTL (parms)) == MEM
+ && XEXP (DECL_RTL (parms), 0) != const0_rtx)
+ {
+ current_sym_code = N_LSYM;
+ /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))).
+ We want the value of that CONST_INT. */
+ current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
+ current_sym_addr = 0;
+ current_sym_nchars = 2 + strlen (IDENTIFIER_POINTER (DECL_NAME (parms)));
+
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:p",
+ IDENTIFIER_POINTER (DECL_NAME (parms)));
+
+#if 0 /* This is actually the case in which a parameter
+ is passed in registers but lives on the stack in a local slot.
+ The address we are using is already correct, so don't change it. */
+
+ /* This is the case where the parm is passed as an int or double
+ and it is converted to a char, short or float and stored back
+ in the parmlist. In this case, describe the parm
+ with the variable's declared type, and adjust the address
+ if the least significant bytes (which we are using) are not
+ the first ones. */
+#ifdef BYTES_BIG_ENDIAN
+ if (TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
+ current_sym_value += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
+ - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
+#endif
+#endif /* 0 */
+
+ dbxout_type (TREE_TYPE (parms), 0);
+ dbxout_finish_symbol ();
+ }
+ }
+}
+
+/* Output definitions, referring to registers,
+ of all the parms in PARMS which are stored in registers during the function.
+ PARMS is a chain of PARM_DECL nodes. */
+
+static void
+dbxout_reg_parms (parms)
+ tree parms;
+{
+ while (parms)
+ {
+ /* Report parms that live in registers during the function. */
+ if (GET_CODE (DECL_RTL (parms)) == REG
+ && REGNO (DECL_RTL (parms)) >= 0
+ && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER
+ && DECL_OFFSET (parms) >= 0)
+ {
+ current_sym_code = N_RSYM;
+ current_sym_value = DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms)));
+ current_sym_addr = 0;
+ current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:r",
+ IDENTIFIER_POINTER (DECL_NAME (parms)));
+ dbxout_type (TREE_TYPE (parms), 0);
+ dbxout_finish_symbol ();
+ }
+ /* Report parms that live in memory but outside the parmlist. */
+ else if (GET_CODE (DECL_RTL (parms)) == MEM
+ && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
+ && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT)
+ {
+ int offset = DECL_OFFSET (parms) / BITS_PER_UNIT;
+ /* A parm declared char is really passed as an int,
+ so it occupies the least significant bytes.
+ On a big-endian machine those are not the low-numbered ones. */
+#ifdef BYTES_BIG_ENDIAN
+ if (offset != -1 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
+ offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
+ - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
+#endif
+ if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset)
+ {
+ current_sym_code = N_LSYM;
+ current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
+ current_sym_addr = 0;
+ current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:",
+ IDENTIFIER_POINTER (DECL_NAME (parms)));
+ dbxout_type (TREE_TYPE (parms), 0);
+ dbxout_finish_symbol ();
+ }
+ }
+ parms = TREE_CHAIN (parms);
+ }
+}
+\f
+/* Given a chain of ..._TYPE nodes (as come in a parameter list),
+ output definitions of those names, in raw form */
+
+void
+dbxout_args (args)
+ tree args;
+{
+ while (args)
+ {
+ putc (',', asmfile);
+ dbxout_type (TREE_VALUE (args), 0);
+ CHARS (1);
+ args = TREE_CHAIN (args);
+ }
+}
+\f
+/* Given a chain of ..._TYPE nodes,
+ find those which have typedef names and output those names.
+ This is to ensure those types get output. */
+
+void
+dbxout_types (types)
+ register tree types;
+{
+ while (types)
+ {
+ if (TYPE_NAME (types)
+ && TREE_CODE (TYPE_NAME (types)) == TYPE_DECL
+ && ! TREE_ASM_WRITTEN (TYPE_NAME (types)))
+ dbxout_symbol (TYPE_NAME (types), 1);
+ types = TREE_CHAIN (types);
+ }
+}
+
+/* Output the tags (struct, union and enum definitions with names) for a block,
+ given a list of them (a chain of TREE_LIST nodes) in TAGS.
+ We must check to include those that have been mentioned already with
+ only a cross-reference. */
+
+void
+dbxout_tags (tags)
+ tree tags;
+{
+ register tree link;
+ for (link = tags; link; link = TREE_CHAIN (link))
+ {
+ register tree type = TYPE_MAIN_VARIANT (TREE_VALUE (link));
+ if (TREE_PURPOSE (link) != 0
+ && ! TREE_ASM_WRITTEN (link)
+ && TYPE_SIZE (type) != 0)
+ {
+ TREE_ASM_WRITTEN (link) = 1;
+ current_sym_code = N_LSYM;
+ current_sym_value = 0;
+ current_sym_addr = 0;
+ current_sym_nchars = 2 + IDENTIFIER_LENGTH (TREE_PURPOSE (link));
+
+ FORCE_TEXT;
+ fprintf (asmfile, ".stabs \"%s:T",
+ IDENTIFIER_POINTER (TREE_PURPOSE (link)));
+ dbxout_type (type, 1);
+ dbxout_finish_symbol ();
+ }
+ }
+}
+\f
+/* Output everything about a symbol block (that is to say, a LET_STMT node
+ that represents a scope level),
+ including recursive output of contained blocks.
+
+ STMT is the LET_STMT node.
+ DEPTH is its depth within containing symbol blocks.
+ ARGS is usually zero; but for the outermost block of the
+ body of a function, it is a chain of PARM_DECLs for the function parameters.
+ We output definitions of all the register parms
+ as if they were local variables of that block.
+
+ Actually, STMT may be several statements chained together.
+ We handle them all in sequence. */
+
+static void
+dbxout_block (stmt, depth, args)
+ register tree stmt;
+ int depth;
+ tree args;
+{
+ int blocknum;
+
+ while (stmt)
+ {
+ switch (TREE_CODE (stmt))
+ {
+ case COMPOUND_STMT:
+ case LOOP_STMT:
+ dbxout_block (STMT_BODY (stmt), depth, 0);
+ break;
+
+ case IF_STMT:
+ dbxout_block (STMT_THEN (stmt), depth, 0);
+ dbxout_block (STMT_ELSE (stmt), depth, 0);
+ break;
+
+ case LET_STMT:
+ /* Ignore LET_STMTs for blocks never really used to make RTL. */
+ if (! TREE_USED (stmt))
+ break;
+ /* In dbx format, the syms of a block come before the N_LBRAC. */
+ dbxout_tags (STMT_TYPE_TAGS (stmt));
+ dbxout_syms (STMT_VARS (stmt));
+ if (args)
+ dbxout_reg_parms (args);
+
+ /* Now output an N_LBRAC symbol to represent the beginning of
+ the block. Use the block's tree-walk order to generate
+ the assembler symbols LBBn and LBEn
+ that final will define around the code in this block. */
+ if (depth > 0)
+ {
+ char buf[20];
+ blocknum = next_block_number++;
+ ASM_GENERATE_INTERNAL_LABEL (buf, "LBB", blocknum);
+ fprintf (asmfile, ".stabn %d,0,0,", N_LBRAC);
+ assemble_name (asmfile, buf);
+ fprintf (asmfile, "\n");
+ }
+
+ /* Output the subblocks. */
+ dbxout_block (STMT_SUBBLOCKS (stmt), depth + 1, 0);
+
+ /* Refer to the marker for the end of the block. */
+ if (depth > 0)
+ {
+ char buf[20];
+ ASM_GENERATE_INTERNAL_LABEL (buf, "LBE", blocknum);
+ fprintf (asmfile, ".stabn %d,0,0,", N_RBRAC);
+ assemble_name (asmfile, buf);
+ fprintf (asmfile, "\n");
+ }
+ }
+ stmt = TREE_CHAIN (stmt);
+ }
+}
+
+/* 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). */
+
+void
+dbxout_function (decl)
+ tree decl;
+{
+ dbxout_symbol (decl, 0);
+ dbxout_parms (DECL_ARGUMENTS (decl));
+ dbxout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl));
+
+ /* If we made any temporary types in this fn that weren't
+ output, output them now. */
+ dbxout_types (get_temporary_types ());
+}
+\f
+#else /* not DBX_DEBUGGING_INFO */
+
+void
+dbxout_init (asm_file, input_file_name)
+ FILE *asm_file;
+ char *input_file_name;
+{}
+
+void
+dbxout_symbol (decl, local)
+ tree decl;
+ int local;
+{}
+
+void
+dbxout_types (types)
+ register tree types;
+{}
+
+void
+dbxout_tags (tags)
+ tree tags;
+{}
+
+void
+dbxout_function (decl)
+ tree decl;
+{}
+
+#endif /* DBX_DEBUGGING_INFO */
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