blob: 39e09c76f22c97e5da27079652766dad23ab6669 [file] [log] [blame]
/* Output variables, constants and external declarations, for GNU compiler.
Copyright (C) 1987, 88, 89, 92-97, 1998 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 2, 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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This file handles generation of all the assembler code
*except* the instructions of a function.
This includes declarations of variables and their initial values.
We also output the assembler code for constants stored in memory
and are responsible for combining constants with the same value. */
#include "config.h"
#include "system.h"
#include <setjmp.h>
/* #include <stab.h> */
#include "rtl.h"
#include "tree.h"
#include "flags.h"
#include "except.h"
#include "function.h"
#include "expr.h"
#include "output.h"
#include "hard-reg-set.h"
#include "regs.h"
#include "defaults.h"
#include "real.h"
#include "toplev.h"
#include "dbxout.h"
#include "sdbout.h"
#include "obstack.h"
#include "c-pragma.h"
#ifdef XCOFF_DEBUGGING_INFO
#include "xcoffout.h"
#endif
#ifndef TRAMPOLINE_ALIGNMENT
#define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
#endif
#ifndef ASM_STABS_OP
#define ASM_STABS_OP ".stabs"
#endif
/* Define the prefix to use when check_memory_usage_flag is enable. */
#ifdef NO_DOLLAR_IN_LABEL
#ifdef NO_DOT_IN_LABEL
#define CHKR_PREFIX "chkr_prefix_"
#else /* !NO_DOT_IN_LABEL */
#define CHKR_PREFIX "chkr."
#endif
#else /* !NO_DOLLAR_IN_LABEL */
#define CHKR_PREFIX "chkr$"
#endif
#define CHKR_PREFIX_SIZE (sizeof (CHKR_PREFIX) - 1)
/* This macro gets just the user-specified name
out of the string in a SYMBOL_REF. On most machines,
we discard the * if any and that's all. */
#ifndef STRIP_NAME_ENCODING
#define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
(VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))
#endif
/* File in which assembler code is being written. */
extern FILE *asm_out_file;
/* The (assembler) name of the first globally-visible object output. */
char *first_global_object_name;
char *weak_global_object_name;
extern struct obstack *current_obstack;
extern struct obstack *saveable_obstack;
extern struct obstack *rtl_obstack;
extern struct obstack permanent_obstack;
#define obstack_chunk_alloc xmalloc
/* Number for making the label on the next
constant that is stored in memory. */
int const_labelno;
/* Number for making the label on the next
static variable internal to a function. */
int var_labelno;
/* Carry information from ASM_DECLARE_OBJECT_NAME
to ASM_FINISH_DECLARE_OBJECT. */
int size_directive_output;
/* The last decl for which assemble_variable was called,
if it did ASM_DECLARE_OBJECT_NAME.
If the last call to assemble_variable didn't do that,
this holds 0. */
tree last_assemble_variable_decl;
#ifdef HANDLE_PRAGMA_WEAK
/* Any weak symbol declarations waiting to be emitted. */
struct weak_syms
{
struct weak_syms *next;
char *name;
char *value;
};
static struct weak_syms *weak_decls;
#endif
/* Nonzero if at least one function definition has been seen. */
static int function_defined;
struct addr_const;
struct constant_descriptor;
struct rtx_const;
struct pool_constant;
static char *strip_reg_name PROTO((char *));
static int contains_pointers_p PROTO((tree));
static void decode_addr_const PROTO((tree, struct addr_const *));
static int const_hash PROTO((tree));
static int compare_constant PROTO((tree,
struct constant_descriptor *));
static char *compare_constant_1 PROTO((tree, char *));
static struct constant_descriptor *record_constant PROTO((tree));
static void record_constant_1 PROTO((tree));
static tree copy_constant PROTO((tree));
static void output_constant_def_contents PROTO((tree, int, int));
static void decode_rtx_const PROTO((enum machine_mode, rtx,
struct rtx_const *));
static int const_hash_rtx PROTO((enum machine_mode, rtx));
static int compare_constant_rtx PROTO((enum machine_mode, rtx,
struct constant_descriptor *));
static struct constant_descriptor *record_constant_rtx PROTO((enum machine_mode,
rtx));
static struct pool_constant *find_pool_constant PROTO((rtx));
static void mark_constant_pool PROTO((void));
static void mark_constants PROTO((rtx));
static int output_addressed_constants PROTO((tree));
static void output_after_function_constants PROTO((void));
static void output_constructor PROTO((tree, int));
#ifdef ASM_OUTPUT_BSS
static void asm_output_bss PROTO((FILE *, tree, char *, int, int));
#endif
#ifdef BSS_SECTION_ASM_OP
#ifdef ASM_OUTPUT_ALIGNED_BSS
static void asm_output_aligned_bss PROTO((FILE *, tree, char *, int, int));
#endif
#endif /* BSS_SECTION_ASM_OP */
static enum in_section { no_section, in_text, in_data, in_named
#ifdef BSS_SECTION_ASM_OP
, in_bss
#endif
#ifdef EH_FRAME_SECTION_ASM_OP
, in_eh_frame
#endif
#ifdef EXTRA_SECTIONS
, EXTRA_SECTIONS
#endif
} in_section = no_section;
/* Return a non-zero value if DECL has a section attribute. */
#define IN_NAMED_SECTION(DECL) \
((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
&& DECL_SECTION_NAME (DECL) != NULL_TREE)
/* Text of section name when in_section == in_named. */
static char *in_named_name;
/* Define functions like text_section for any extra sections. */
#ifdef EXTRA_SECTION_FUNCTIONS
EXTRA_SECTION_FUNCTIONS
#endif
/* Tell assembler to switch to text section. */
void
text_section ()
{
if (in_section != in_text)
{
fprintf (asm_out_file, "%s\n", TEXT_SECTION_ASM_OP);
in_section = in_text;
}
}
/* Tell assembler to switch to data section. */
void
data_section ()
{
if (in_section != in_data)
{
if (flag_shared_data)
{
#ifdef SHARED_SECTION_ASM_OP
fprintf (asm_out_file, "%s\n", SHARED_SECTION_ASM_OP);
#else
fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);
#endif
}
else
fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);
in_section = in_data;
}
}
/* Tell assembler to switch to read-only data section. This is normally
the text section. */
void
readonly_data_section ()
{
#ifdef READONLY_DATA_SECTION
READONLY_DATA_SECTION (); /* Note this can call data_section. */
#else
text_section ();
#endif
}
/* Determine if we're in the text section. */
int
in_text_section ()
{
return in_section == in_text;
}
/* Determine if we're in the data section. */
int
in_data_section ()
{
return in_section == in_data;
}
/* Tell assembler to change to section NAME for DECL.
If DECL is NULL, just switch to section NAME.
If NAME is NULL, get the name from DECL.
If RELOC is 1, the initializer for DECL contains relocs. */
void
named_section (decl, name, reloc)
tree decl;
char *name;
int reloc;
{
if (decl != NULL_TREE
&& TREE_CODE_CLASS (TREE_CODE (decl)) != 'd')
abort ();
if (name == NULL)
name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
if (in_section != in_named || strcmp (name, in_named_name))
{
#ifdef ASM_OUTPUT_SECTION_NAME
ASM_OUTPUT_SECTION_NAME (asm_out_file, decl, name, reloc);
#else
/* Section attributes are not supported if this macro isn't provided -
some host formats don't support them at all. The front-end should
already have flagged this as an error. */
abort ();
#endif
in_named_name = obstack_alloc (&permanent_obstack, strlen (name) + 1);
strcpy (in_named_name, name);
in_section = in_named;
}
}
#ifdef ASM_OUTPUT_SECTION_NAME
#ifndef UNIQUE_SECTION
#define UNIQUE_SECTION(DECL,RELOC) \
do { \
int len; \
char *name, *string; \
\
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
/* Strip off any encoding in name. */ \
STRIP_NAME_ENCODING (name, name); \
\
len = strlen (name) + 1; \
string = alloca (len + 1); \
sprintf (string, ".%s", name); \
\
DECL_SECTION_NAME (DECL) = build_string (len, string); \
} while (0)
#endif
#ifndef UNIQUE_SECTION_P
#define UNIQUE_SECTION_P(DECL) 0
#endif
#endif
#ifdef BSS_SECTION_ASM_OP
/* Tell the assembler to switch to the bss section. */
void
bss_section ()
{
if (in_section != in_bss)
{
#ifdef SHARED_BSS_SECTION_ASM_OP
if (flag_shared_data)
fprintf (asm_out_file, "%s\n", SHARED_BSS_SECTION_ASM_OP);
else
#endif
fprintf (asm_out_file, "%s\n", BSS_SECTION_ASM_OP);
in_section = in_bss;
}
}
#ifdef ASM_OUTPUT_BSS
/* Utility function for ASM_OUTPUT_BSS for targets to use if
they don't support alignments in .bss.
??? It is believed that this function will work in most cases so such
support is localized here. */
static void
asm_output_bss (file, decl, name, size, rounded)
FILE *file;
tree decl;
char *name;
int size, rounded;
{
ASM_GLOBALIZE_LABEL (file, name);
bss_section ();
#ifdef ASM_DECLARE_OBJECT_NAME
last_assemble_variable_decl = decl;
ASM_DECLARE_OBJECT_NAME (file, name, decl);
#else
/* Standard thing is just output label for the object. */
ASM_OUTPUT_LABEL (file, name);
#endif /* ASM_DECLARE_OBJECT_NAME */
ASM_OUTPUT_SKIP (file, rounded);
}
#endif
#ifdef ASM_OUTPUT_ALIGNED_BSS
/* Utility function for targets to use in implementing
ASM_OUTPUT_ALIGNED_BSS.
??? It is believed that this function will work in most cases so such
support is localized here. */
static void
asm_output_aligned_bss (file, decl, name, size, align)
FILE *file;
tree decl;
char *name;
int size, align;
{
ASM_GLOBALIZE_LABEL (file, name);
bss_section ();
ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
#ifdef ASM_DECLARE_OBJECT_NAME
last_assemble_variable_decl = decl;
ASM_DECLARE_OBJECT_NAME (file, name, decl);
#else
/* Standard thing is just output label for the object. */
ASM_OUTPUT_LABEL (file, name);
#endif /* ASM_DECLARE_OBJECT_NAME */
ASM_OUTPUT_SKIP (file, size ? size : 1);
}
#endif
#endif /* BSS_SECTION_ASM_OP */
#ifdef EH_FRAME_SECTION_ASM_OP
void
eh_frame_section ()
{
if (in_section != in_eh_frame)
{
fprintf (asm_out_file, "%s\n", EH_FRAME_SECTION_ASM_OP);
in_section = in_eh_frame;
}
}
#endif
/* Switch to the section for function DECL.
If DECL is NULL_TREE, switch to the text section.
??? It's not clear that we will ever be passed NULL_TREE, but it's
safer to handle it. */
void
function_section (decl)
tree decl;
{
if (decl != NULL_TREE
&& DECL_SECTION_NAME (decl) != NULL_TREE)
named_section (decl, (char *) 0, 0);
else
text_section ();
}
/* Switch to section for variable DECL.
RELOC is the `reloc' argument to SELECT_SECTION. */
void
variable_section (decl, reloc)
tree decl;
int reloc;
{
if (IN_NAMED_SECTION (decl))
named_section (decl, NULL, reloc);
else
{
/* C++ can have const variables that get initialized from constructors,
and thus can not be in a readonly section. We prevent this by
verifying that the initial value is constant for objects put in a
readonly section.
error_mark_node is used by the C front end to indicate that the
initializer has not been seen yet. In this case, we assume that
the initializer must be constant.
C++ uses error_mark_node for variables that have complicated
initializers, but these variables go in BSS so we won't be called
for them. */
#ifdef SELECT_SECTION
SELECT_SECTION (decl, reloc);
#else
if (DECL_READONLY_SECTION (decl, reloc))
readonly_data_section ();
else
data_section ();
#endif
}
}
/* Tell assembler to switch to the section for the exception handling
table. */
void
exception_section ()
{
#if defined (EXCEPTION_SECTION)
EXCEPTION_SECTION ();
#else
#ifdef ASM_OUTPUT_SECTION_NAME
named_section (NULL_TREE, ".gcc_except_table", 0);
#else
if (flag_pic)
data_section ();
else
readonly_data_section ();
#endif
#endif
}
/* Create the rtl to represent a function, for a function definition.
DECL is a FUNCTION_DECL node which describes which function.
The rtl is stored into DECL. */
void
make_function_rtl (decl)
tree decl;
{
char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
char *new_name = name;
/* Rename a nested function to avoid conflicts. */
if (decl_function_context (decl) != 0
&& DECL_INITIAL (decl) != 0
&& DECL_RTL (decl) == 0)
{
char *label;
name = IDENTIFIER_POINTER (DECL_NAME (decl));
ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
name = obstack_copy0 (saveable_obstack, label, strlen (label));
var_labelno++;
}
else
{
/* When -fprefix-function-name is used, every function name is
prefixed. Even static functions are prefixed because they
could be declared latter. Note that a nested function name
is not prefixed. */
if (flag_prefix_function_name)
{
new_name = (char *) alloca (strlen (name) + CHKR_PREFIX_SIZE + 1);
strcpy (new_name, CHKR_PREFIX);
strcpy (new_name + CHKR_PREFIX_SIZE, name);
name = obstack_copy0 (saveable_obstack, new_name, strlen (new_name));
}
}
if (DECL_RTL (decl) == 0)
{
DECL_RTL (decl)
= gen_rtx_MEM (DECL_MODE (decl),
gen_rtx_SYMBOL_REF (Pmode, name));
/* Optionally set flags or add text to the name to record information
such as that it is a function name. If the name is changed, the macro
ASM_OUTPUT_LABELREF will have to know how to strip this information. */
#ifdef ENCODE_SECTION_INFO
ENCODE_SECTION_INFO (decl);
#endif
}
else
{
/* ??? Another way to do this would be to do what halfpic.c does
and maintain a hashed table of such critters. */
/* ??? Another way to do this would be to pass a flag bit to
ENCODE_SECTION_INFO saying whether this is a new decl or not. */
/* Let the target reassign the RTL if it wants.
This is necessary, for example, when one machine specific
decl attribute overrides another. */
#ifdef REDO_SECTION_INFO_P
if (REDO_SECTION_INFO_P (decl))
ENCODE_SECTION_INFO (decl);
#endif
}
/* Record at least one function has been defined. */
function_defined = 1;
}
/* Given NAME, a putative register name, discard any customary prefixes. */
static char *
strip_reg_name (name)
char *name;
{
#ifdef REGISTER_PREFIX
if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
name += strlen (REGISTER_PREFIX);
#endif
if (name[0] == '%' || name[0] == '#')
name++;
return name;
}
/* Decode an `asm' spec for a declaration as a register name.
Return the register number, or -1 if nothing specified,
or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
or -3 if ASMSPEC is `cc' and is not recognized,
or -4 if ASMSPEC is `memory' and is not recognized.
Accept an exact spelling or a decimal number.
Prefixes such as % are optional. */
int
decode_reg_name (asmspec)
char *asmspec;
{
if (asmspec != 0)
{
int i;
/* Get rid of confusing prefixes. */
asmspec = strip_reg_name (asmspec);
/* Allow a decimal number as a "register name". */
for (i = strlen (asmspec) - 1; i >= 0; i--)
if (! (asmspec[i] >= '0' && asmspec[i] <= '9'))
break;
if (asmspec[0] != 0 && i < 0)
{
i = atoi (asmspec);
if (i < FIRST_PSEUDO_REGISTER && i >= 0)
return i;
else
return -2;
}
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (reg_names[i][0]
&& ! strcmp (asmspec, strip_reg_name (reg_names[i])))
return i;
#ifdef ADDITIONAL_REGISTER_NAMES
{
static struct { char *name; int number; } table[]
= ADDITIONAL_REGISTER_NAMES;
for (i = 0; i < sizeof (table) / sizeof (table[0]); i++)
if (! strcmp (asmspec, table[i].name))
return table[i].number;
}
#endif /* ADDITIONAL_REGISTER_NAMES */
if (!strcmp (asmspec, "memory"))
return -4;
if (!strcmp (asmspec, "cc"))
return -3;
return -2;
}
return -1;
}
/* Create the DECL_RTL for a declaration for a static or external variable
or static or external function.
ASMSPEC, if not 0, is the string which the user specified
as the assembler symbol name.
TOP_LEVEL is nonzero if this is a file-scope variable.
This is never called for PARM_DECL nodes. */
void
make_decl_rtl (decl, asmspec, top_level)
tree decl;
char *asmspec;
int top_level;
{
register char *name = 0;
int reg_number;
reg_number = decode_reg_name (asmspec);
if (DECL_ASSEMBLER_NAME (decl) != NULL_TREE)
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
if (reg_number == -2)
{
/* ASMSPEC is given, and not the name of a register. */
name = (char *) obstack_alloc (saveable_obstack,
strlen (asmspec) + 2);
name[0] = '*';
strcpy (&name[1], asmspec);
}
/* For a duplicate declaration, we can be called twice on the
same DECL node. Don't discard the RTL already made. */
if (DECL_RTL (decl) == 0)
{
/* First detect errors in declaring global registers. */
if (TREE_CODE (decl) != FUNCTION_DECL
&& DECL_REGISTER (decl) && reg_number == -1)
error_with_decl (decl,
"register name not specified for `%s'");
else if (TREE_CODE (decl) != FUNCTION_DECL
&& DECL_REGISTER (decl) && reg_number < 0)
error_with_decl (decl,
"invalid register name for `%s'");
else if ((reg_number >= 0 || reg_number == -3)
&& (TREE_CODE (decl) == FUNCTION_DECL
&& ! DECL_REGISTER (decl)))
error_with_decl (decl,
"register name given for non-register variable `%s'");
else if (TREE_CODE (decl) != FUNCTION_DECL
&& DECL_REGISTER (decl)
&& TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
error_with_decl (decl,
"data type of `%s' isn't suitable for a register");
else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl)
&& ! HARD_REGNO_MODE_OK (reg_number,
TYPE_MODE (TREE_TYPE (decl))))
error_with_decl (decl,
"register number for `%s' isn't suitable for data type");
/* Now handle properly declared static register variables. */
else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
{
int nregs;
if (DECL_INITIAL (decl) != 0 && top_level)
{
DECL_INITIAL (decl) = 0;
error ("global register variable has initial value");
}
if (fixed_regs[reg_number] == 0
&& function_defined && top_level)
error ("global register variable follows a function definition");
if (TREE_THIS_VOLATILE (decl))
warning ("volatile register variables don't work as you might wish");
/* If the user specified one of the eliminables registers here,
e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
confused with that register and be eliminated. Although this
usage is somewhat suspect, we nevertheless use the following
kludge to avoid setting DECL_RTL to frame_pointer_rtx. */
DECL_RTL (decl)
= gen_rtx_REG (DECL_MODE (decl), FIRST_PSEUDO_REGISTER);
REGNO (DECL_RTL (decl)) = reg_number;
REG_USERVAR_P (DECL_RTL (decl)) = 1;
if (top_level)
{
/* Make this register global, so not usable for anything
else. */
nregs = HARD_REGNO_NREGS (reg_number, DECL_MODE (decl));
while (nregs > 0)
globalize_reg (reg_number + --nregs);
}
}
/* Specifying a section attribute on a variable forces it into a
non-.bss section, and thus it cannot be common. */
else if (TREE_CODE (decl) == VAR_DECL
&& DECL_SECTION_NAME (decl) != NULL_TREE
&& DECL_INITIAL (decl) == NULL_TREE
&& DECL_COMMON (decl))
DECL_COMMON (decl) = 0;
/* Now handle ordinary static variables and functions (in memory).
Also handle vars declared register invalidly. */
if (DECL_RTL (decl) == 0)
{
/* Can't use just the variable's own name for a variable
whose scope is less than the whole file.
Concatenate a distinguishing number. */
if (!top_level && !TREE_PUBLIC (decl) && asmspec == 0)
{
char *label;
ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
name = obstack_copy0 (saveable_obstack, label, strlen (label));
var_labelno++;
}
if (name == 0)
abort ();
/* When -fprefix-function-name is used, the functions
names are prefixed. Only nested function names are not
prefixed. */
if (flag_prefix_function_name && TREE_CODE (decl) == FUNCTION_DECL)
{
char *new_name;
new_name = (char *) alloca (strlen (name) + CHKR_PREFIX_SIZE
+ 1);
strcpy (new_name, CHKR_PREFIX);
strcpy (new_name + CHKR_PREFIX_SIZE, name);
name = obstack_copy0 (saveable_obstack,
new_name, strlen (new_name));
}
DECL_RTL (decl) = gen_rtx_MEM (DECL_MODE (decl),
gen_rtx_SYMBOL_REF (Pmode, name));
MEM_ALIAS_SET (DECL_RTL (decl)) = get_alias_set (decl);
/* If this variable is to be treated as volatile, show its
tree node has side effects. If it has side effects, either
because of this test or from TREE_THIS_VOLATILE also
being set, show the MEM is volatile. */
if (flag_volatile_global && TREE_CODE (decl) == VAR_DECL
&& TREE_PUBLIC (decl))
TREE_SIDE_EFFECTS (decl) = 1;
if (TREE_SIDE_EFFECTS (decl))
MEM_VOLATILE_P (DECL_RTL (decl)) = 1;
if (TREE_READONLY (decl))
RTX_UNCHANGING_P (DECL_RTL (decl)) = 1;
MEM_IN_STRUCT_P (DECL_RTL (decl))
= AGGREGATE_TYPE_P (TREE_TYPE (decl));
/* Optionally set flags or add text to the name to record information
such as that it is a function name.
If the name is changed, the macro ASM_OUTPUT_LABELREF
will have to know how to strip this information. */
#ifdef ENCODE_SECTION_INFO
ENCODE_SECTION_INFO (decl);
#endif
}
}
else
{
/* If the old RTL had the wrong mode, fix the mode. */
if (GET_MODE (DECL_RTL (decl)) != DECL_MODE (decl))
{
rtx rtl = DECL_RTL (decl);
PUT_MODE (rtl, DECL_MODE (decl));
}
/* ??? Another way to do this would be to do what halfpic.c does
and maintain a hashed table of such critters. */
/* ??? Another way to do this would be to pass a flag bit to
ENCODE_SECTION_INFO saying whether this is a new decl or not. */
/* Let the target reassign the RTL if it wants.
This is necessary, for example, when one machine specific
decl attribute overrides another. */
#ifdef REDO_SECTION_INFO_P
if (REDO_SECTION_INFO_P (decl))
ENCODE_SECTION_INFO (decl);
#endif
}
}
/* Make the rtl for variable VAR be volatile.
Use this only for static variables. */
void
make_var_volatile (var)
tree var;
{
if (GET_CODE (DECL_RTL (var)) != MEM)
abort ();
MEM_VOLATILE_P (DECL_RTL (var)) = 1;
}
/* Output alignment directive to align for constant expression EXP. */
void
assemble_constant_align (exp)
tree exp;
{
int align;
/* Align the location counter as required by EXP's data type. */
align = TYPE_ALIGN (TREE_TYPE (exp));
#ifdef CONSTANT_ALIGNMENT
align = CONSTANT_ALIGNMENT (exp, align);
#endif
if (align > BITS_PER_UNIT)
ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
}
/* Output a string of literal assembler code
for an `asm' keyword used between functions. */
void
assemble_asm (string)
tree string;
{
app_enable ();
if (TREE_CODE (string) == ADDR_EXPR)
string = TREE_OPERAND (string, 0);
fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
}
#if 0 /* This should no longer be needed, because
flag_gnu_linker should be 0 on these systems,
which should prevent any output
if ASM_OUTPUT_CONSTRUCTOR and ASM_OUTPUT_DESTRUCTOR are absent. */
#if !(defined(DBX_DEBUGGING_INFO) && !defined(FASCIST_ASSEMBLER))
#ifndef ASM_OUTPUT_CONSTRUCTOR
#define ASM_OUTPUT_CONSTRUCTOR(file, name)
#endif
#ifndef ASM_OUTPUT_DESTRUCTOR
#define ASM_OUTPUT_DESTRUCTOR(file, name)
#endif
#endif
#endif /* 0 */
/* Record an element in the table of global destructors.
How this is done depends on what sort of assembler and linker
are in use.
NAME should be the name of a global function to be called
at exit time. This name is output using assemble_name. */
void
assemble_destructor (name)
char *name;
{
#ifdef ASM_OUTPUT_DESTRUCTOR
ASM_OUTPUT_DESTRUCTOR (asm_out_file, name);
#else
if (flag_gnu_linker)
{
/* Now tell GNU LD that this is part of the static destructor set. */
/* This code works for any machine provided you use GNU as/ld. */
fprintf (asm_out_file, "%s \"___DTOR_LIST__\",22,0,0,", ASM_STABS_OP);
assemble_name (asm_out_file, name);
fputc ('\n', asm_out_file);
}
#endif
}
/* Likewise for global constructors. */
void
assemble_constructor (name)
char *name;
{
#ifdef ASM_OUTPUT_CONSTRUCTOR
ASM_OUTPUT_CONSTRUCTOR (asm_out_file, name);
#else
if (flag_gnu_linker)
{
/* Now tell GNU LD that this is part of the static constructor set. */
/* This code works for any machine provided you use GNU as/ld. */
fprintf (asm_out_file, "%s \"___CTOR_LIST__\",22,0,0,", ASM_STABS_OP);
assemble_name (asm_out_file, name);
fputc ('\n', asm_out_file);
}
#endif
}
/* Likewise for entries we want to record for garbage collection.
Garbage collection is still under development. */
void
assemble_gc_entry (name)
char *name;
{
#ifdef ASM_OUTPUT_GC_ENTRY
ASM_OUTPUT_GC_ENTRY (asm_out_file, name);
#else
if (flag_gnu_linker)
{
/* Now tell GNU LD that this is part of the static constructor set. */
fprintf (asm_out_file, "%s \"___PTR_LIST__\",22,0,0,", ASM_STABS_OP);
assemble_name (asm_out_file, name);
fputc ('\n', asm_out_file);
}
#endif
}
/* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
a non-zero value if the constant pool should be output before the
start of the function, or a zero value if the pool should output
after the end of the function. The default is to put it before the
start. */
#ifndef CONSTANT_POOL_BEFORE_FUNCTION
#define CONSTANT_POOL_BEFORE_FUNCTION 1
#endif
/* Output assembler code for the constant pool of a function and associated
with defining the name of the function. DECL describes the function.
NAME is the function's name. For the constant pool, we use the current
constant pool data. */
void
assemble_start_function (decl, fnname)
tree decl;
char *fnname;
{
int align;
/* The following code does not need preprocessing in the assembler. */
app_disable ();
if (CONSTANT_POOL_BEFORE_FUNCTION)
output_constant_pool (fnname, decl);
#ifdef ASM_OUTPUT_SECTION_NAME
/* If the function is to be put in its own section and it's not in a section
already, indicate so. */
if ((flag_function_sections
&& DECL_SECTION_NAME (decl) == NULL_TREE)
|| UNIQUE_SECTION_P (decl))
UNIQUE_SECTION (decl, 0);
#endif
function_section (decl);
/* Tell assembler to move to target machine's alignment for functions. */
align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
if (align > 0)
ASM_OUTPUT_ALIGN (asm_out_file, align);
#ifdef ASM_OUTPUT_FUNCTION_PREFIX
ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
#endif
#ifdef SDB_DEBUGGING_INFO
/* Output SDB definition of the function. */
if (write_symbols == SDB_DEBUG)
sdbout_mark_begin_function ();
#endif
#ifdef DBX_DEBUGGING_INFO
/* Output DBX definition of the function. */
if (write_symbols == DBX_DEBUG)
dbxout_begin_function (decl);
#endif
/* Make function name accessible from other files, if appropriate. */
if (TREE_PUBLIC (decl))
{
if (! first_global_object_name)
{
char *p;
char **name;
if (! DECL_WEAK (decl) && ! DECL_ONE_ONLY (decl))
name = &first_global_object_name;
else
name = &weak_global_object_name;
STRIP_NAME_ENCODING (p, fnname);
*name = permalloc (strlen (p) + 1);
strcpy (*name, p);
}
#ifdef ASM_WEAKEN_LABEL
if (DECL_WEAK (decl))
ASM_WEAKEN_LABEL (asm_out_file, fnname);
else
#endif
ASM_GLOBALIZE_LABEL (asm_out_file, fnname);
}
/* Do any machine/system dependent processing of the function name */
#ifdef ASM_DECLARE_FUNCTION_NAME
ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
#else
/* Standard thing is just output label for the function. */
ASM_OUTPUT_LABEL (asm_out_file, fnname);
#endif /* ASM_DECLARE_FUNCTION_NAME */
}
/* Output assembler code associated with defining the size of the
function. DECL describes the function. NAME is the function's name. */
void
assemble_end_function (decl, fnname)
tree decl;
char *fnname;
{
#ifdef ASM_DECLARE_FUNCTION_SIZE
ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
#endif
if (! CONSTANT_POOL_BEFORE_FUNCTION)
{
output_constant_pool (fnname, decl);
function_section (decl); /* need to switch back */
}
/* Output any constants which should appear after the function. */
output_after_function_constants ();
}
/* Assemble code to leave SIZE bytes of zeros. */
void
assemble_zeros (size)
int size;
{
#ifdef ASM_NO_SKIP_IN_TEXT
/* The `space' pseudo in the text section outputs nop insns rather than 0s,
so we must output 0s explicitly in the text section. */
if (ASM_NO_SKIP_IN_TEXT && in_text_section ())
{
int i;
for (i = 0; i < size - 20; i += 20)
{
#ifdef ASM_BYTE_OP
fprintf (asm_out_file,
"%s 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n", ASM_BYTE_OP);
#else
fprintf (asm_out_file,
"\tbyte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n");
#endif
}
if (i < size)
{
#ifdef ASM_BYTE_OP
fprintf (asm_out_file, "%s 0", ASM_BYTE_OP);
#else
fprintf (asm_out_file, "\tbyte 0");
#endif
i++;
for (; i < size; i++)
fprintf (asm_out_file, ",0");
fprintf (asm_out_file, "\n");
}
}
else
#endif
if (size > 0)
ASM_OUTPUT_SKIP (asm_out_file, size);
}
/* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
void
assemble_align (align)
int align;
{
if (align > BITS_PER_UNIT)
ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
}
/* Assemble a string constant with the specified C string as contents. */
void
assemble_string (p, size)
char *p;
int size;
{
int pos = 0;
int maximum = 2000;
/* If the string is very long, split it up. */
while (pos < size)
{
int thissize = size - pos;
if (thissize > maximum)
thissize = maximum;
ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
pos += thissize;
p += thissize;
}
}
/* Assemble everything that is needed for a variable or function declaration.
Not used for automatic variables, and not used for function definitions.
Should not be called for variables of incomplete structure type.
TOP_LEVEL is nonzero if this variable has file scope.
AT_END is nonzero if this is the special handling, at end of compilation,
to define things that have had only tentative definitions.
DONT_OUTPUT_DATA if nonzero means don't actually output the
initial value (that will be done by the caller). */
void
assemble_variable (decl, top_level, at_end, dont_output_data)
tree decl;
int top_level;
int at_end;
int dont_output_data;
{
register char *name;
unsigned int align;
tree size_tree;
int reloc = 0;
enum in_section saved_in_section;
last_assemble_variable_decl = 0;
if (GET_CODE (DECL_RTL (decl)) == REG)
{
/* Do output symbol info for global register variables, but do nothing
else for them. */
if (TREE_ASM_WRITTEN (decl))
return;
TREE_ASM_WRITTEN (decl) = 1;
#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
/* File-scope global variables are output here. */
if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
&& top_level)
dbxout_symbol (decl, 0);
#endif
#ifdef SDB_DEBUGGING_INFO
if (write_symbols == SDB_DEBUG && top_level
/* Leave initialized global vars for end of compilation;
see comment in compile_file. */
&& (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0))
sdbout_symbol (decl, 0);
#endif
/* Don't output any DWARF debugging information for variables here.
In the case of local variables, the information for them is output
when we do our recursive traversal of the tree representation for
the entire containing function. In the case of file-scope variables,
we output information for all of them at the very end of compilation
while we are doing our final traversal of the chain of file-scope
declarations. */
return;
}
/* Normally no need to say anything here for external references,
since assemble_external is called by the language-specific code
when a declaration is first seen. */
if (DECL_EXTERNAL (decl))
return;
/* Output no assembler code for a function declaration.
Only definitions of functions output anything. */
if (TREE_CODE (decl) == FUNCTION_DECL)
return;
/* If type was incomplete when the variable was declared,
see if it is complete now. */
if (DECL_SIZE (decl) == 0)
layout_decl (decl, 0);
/* Still incomplete => don't allocate it; treat the tentative defn
(which is what it must have been) as an `extern' reference. */
if (!dont_output_data && DECL_SIZE (decl) == 0)
{
error_with_file_and_line (DECL_SOURCE_FILE (decl),
DECL_SOURCE_LINE (decl),
"storage size of `%s' isn't known",
IDENTIFIER_POINTER (DECL_NAME (decl)));
TREE_ASM_WRITTEN (decl) = 1;
return;
}
/* The first declaration of a variable that comes through this function
decides whether it is global (in C, has external linkage)
or local (in C, has internal linkage). So do nothing more
if this function has already run. */
if (TREE_ASM_WRITTEN (decl))
return;
TREE_ASM_WRITTEN (decl) = 1;
app_disable ();
if (! dont_output_data)
{
int size;
if (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
goto finish;
/* This is better than explicit arithmetic, since it avoids overflow. */
size_tree = size_binop (CEIL_DIV_EXPR,
DECL_SIZE (decl), size_int (BITS_PER_UNIT));
size = TREE_INT_CST_LOW (size_tree);
if (TREE_INT_CST_HIGH (size_tree) != 0
|| size != TREE_INT_CST_LOW (size_tree))
{
error_with_decl (decl, "size of variable `%s' is too large");
goto finish;
}
}
name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
if (TREE_PUBLIC (decl) && DECL_NAME (decl)
&& ! first_global_object_name
&& ! (DECL_COMMON (decl) && (DECL_INITIAL (decl) == 0
|| DECL_INITIAL (decl) == error_mark_node))
&& ! DECL_WEAK (decl)
&& ! DECL_ONE_ONLY (decl))
{
char *p;
STRIP_NAME_ENCODING (p, name);
first_global_object_name = permalloc (strlen (p) + 1);
strcpy (first_global_object_name, p);
}
/* Compute the alignment of this data. */
align = DECL_ALIGN (decl);
/* In the case for initialing an array whose length isn't specified,
where we have not yet been able to do the layout,
figure out the proper alignment now. */
if (dont_output_data && DECL_SIZE (decl) == 0
&& TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
/* Some object file formats have a maximum alignment which they support.
In particular, a.out format supports a maximum alignment of 4. */
#ifndef MAX_OFILE_ALIGNMENT
#define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
#endif
if (align > MAX_OFILE_ALIGNMENT)
{
warning_with_decl (decl,
"alignment of `%s' is greater than maximum object file alignment. Using %d.",
MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
align = MAX_OFILE_ALIGNMENT;
}
/* On some machines, it is good to increase alignment sometimes. */
#ifdef DATA_ALIGNMENT
align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
#endif
#ifdef CONSTANT_ALIGNMENT
if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
#endif
/* Reset the alignment in case we have made it tighter, so we can benefit
from it in get_pointer_alignment. */
DECL_ALIGN (decl) = align;
/* Handle uninitialized definitions. */
if ((DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node)
/* If the target can't output uninitialized but not common global data
in .bss, then we have to use .data. */
#if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
&& DECL_COMMON (decl)
#endif
&& ! dont_output_data)
{
int size = TREE_INT_CST_LOW (size_tree);
int rounded = size;
/* Don't allocate zero bytes of common,
since that means "undefined external" in the linker. */
if (size == 0) rounded = 1;
/* Round size up to multiple of BIGGEST_ALIGNMENT bits
so that each uninitialized object starts on such a boundary. */
rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
* (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
#if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS)
if ( (DECL_ALIGN (decl) / BITS_PER_UNIT) > rounded)
warning_with_decl
(decl, "requested alignment for %s is greater than implemented alignment of %d.",rounded);
#endif
#ifdef DBX_DEBUGGING_INFO
/* File-scope global variables are output here. */
if (write_symbols == DBX_DEBUG && top_level)
dbxout_symbol (decl, 0);
#endif
#ifdef SDB_DEBUGGING_INFO
if (write_symbols == SDB_DEBUG && top_level
/* Leave initialized global vars for end of compilation;
see comment in compile_file. */
&& (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0))
sdbout_symbol (decl, 0);
#endif
/* Don't output any DWARF debugging information for variables here.
In the case of local variables, the information for them is output
when we do our recursive traversal of the tree representation for
the entire containing function. In the case of file-scope variables,
we output information for all of them at the very end of compilation
while we are doing our final traversal of the chain of file-scope
declarations. */
#if 0 /* ??? We should either delete this or add a comment describing what
it was intended to do and why we shouldn't delete it. */
if (flag_shared_data)
data_section ();
#endif
if (TREE_PUBLIC (decl)
#if defined (ASM_OUTPUT_BSS) || defined (ASM_OUTPUT_ALIGNED_BSS)
&& DECL_COMMON (decl)
#endif
)
{
#ifdef ASM_OUTPUT_SHARED_COMMON
if (flag_shared_data)
ASM_OUTPUT_SHARED_COMMON (asm_out_file, name, size, rounded);
else
#endif
{
#ifdef ASM_OUTPUT_ALIGNED_DECL_COMMON
ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name, size,
DECL_ALIGN (decl));
#else
#ifdef ASM_OUTPUT_ALIGNED_COMMON
ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size,
DECL_ALIGN (decl));
#else
ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
#endif
#endif
}
}
#if defined (ASM_OUTPUT_BSS) || defined (ASM_OUTPUT_ALIGNED_BSS)
else if (TREE_PUBLIC (decl))
{
#ifdef ASM_OUTPUT_SHARED_BSS
if (flag_shared_data)
ASM_OUTPUT_SHARED_BSS (asm_out_file, decl, name, size, rounded);
else
#endif
{
#ifdef ASM_OUTPUT_ALIGNED_BSS
ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size,
DECL_ALIGN (decl));
#else
ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
#endif
}
}
#endif /* ASM_OUTPUT_BSS || ASM_OUTPUT_ALIGNED_BSS */
else
{
#ifdef ASM_OUTPUT_SHARED_LOCAL
if (flag_shared_data)
ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
else
#endif
{
#ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name, size,
DECL_ALIGN (decl));
#else
#ifdef ASM_OUTPUT_ALIGNED_LOCAL
ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size,
DECL_ALIGN (decl));
#else
ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
#endif
#endif
}
}
goto finish;
}
/* Handle initialized definitions.
Also handle uninitialized global definitions if -fno-common and the
target doesn't support ASM_OUTPUT_BSS. */
/* First make the assembler name(s) global if appropriate. */
if (TREE_PUBLIC (decl) && DECL_NAME (decl))
{
#ifdef ASM_WEAKEN_LABEL
if (DECL_WEAK (decl))
ASM_WEAKEN_LABEL (asm_out_file, name);
else
#endif
ASM_GLOBALIZE_LABEL (asm_out_file, name);
}
#if 0
for (d = equivalents; d; d = TREE_CHAIN (d))
{
tree e = TREE_VALUE (d);
if (TREE_PUBLIC (e) && DECL_NAME (e))
ASM_GLOBALIZE_LABEL (asm_out_file,
XSTR (XEXP (DECL_RTL (e), 0), 0));
}
#endif
/* Output any data that we will need to use the address of. */
if (DECL_INITIAL (decl) == error_mark_node)
reloc = contains_pointers_p (TREE_TYPE (decl));
else if (DECL_INITIAL (decl))
reloc = output_addressed_constants (DECL_INITIAL (decl));
#ifdef ASM_OUTPUT_SECTION_NAME
if (UNIQUE_SECTION_P (decl))
UNIQUE_SECTION (decl, reloc);
#endif
/* Switch to the appropriate section. */
variable_section (decl, reloc);
/* dbxout.c needs to know this. */
if (in_text_section ())
DECL_IN_TEXT_SECTION (decl) = 1;
/* Record current section so we can restore it if dbxout.c clobbers it. */
saved_in_section = in_section;
/* Output the dbx info now that we have chosen the section. */
#ifdef DBX_DEBUGGING_INFO
/* File-scope global variables are output here. */
if (write_symbols == DBX_DEBUG && top_level)
dbxout_symbol (decl, 0);
#endif
#ifdef SDB_DEBUGGING_INFO
if (write_symbols == SDB_DEBUG && top_level
/* Leave initialized global vars for end of compilation;
see comment in compile_file. */
&& (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0))
sdbout_symbol (decl, 0);
#endif
/* Don't output any DWARF debugging information for variables here.
In the case of local variables, the information for them is output
when we do our recursive traversal of the tree representation for
the entire containing function. In the case of file-scope variables,
we output information for all of them at the very end of compilation
while we are doing our final traversal of the chain of file-scope
declarations. */
/* If the debugging output changed sections, reselect the section
that's supposed to be selected. */
if (in_section != saved_in_section)
variable_section (decl, reloc);
/* Output the alignment of this data. */
if (align > BITS_PER_UNIT)
ASM_OUTPUT_ALIGN (asm_out_file,
floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT));
/* Do any machine/system dependent processing of the object. */
#ifdef ASM_DECLARE_OBJECT_NAME
last_assemble_variable_decl = decl;
ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
#else
/* Standard thing is just output label for the object. */
ASM_OUTPUT_LABEL (asm_out_file, name);
#endif /* ASM_DECLARE_OBJECT_NAME */
if (!dont_output_data)
{
if (DECL_INITIAL (decl))
/* Output the actual data. */
output_constant (DECL_INITIAL (decl), TREE_INT_CST_LOW (size_tree));
else
/* Leave space for it. */
assemble_zeros (TREE_INT_CST_LOW (size_tree));
}
finish:
#ifdef XCOFF_DEBUGGING_INFO
/* Unfortunately, the IBM assembler cannot handle stabx before the actual
declaration. When something like ".stabx "aa:S-2",aa,133,0" is emitted
and `aa' hasn't been output yet, the assembler generates a stab entry with
a value of zero, in addition to creating an unnecessary external entry
for `aa'. Hence, we must postpone dbxout_symbol to here at the end. */
/* File-scope global variables are output here. */
if (write_symbols == XCOFF_DEBUG && top_level)
{
saved_in_section = in_section;
dbxout_symbol (decl, 0);
if (in_section != saved_in_section)
variable_section (decl, reloc);
}
#else
/* There must be a statement after a label. */
;
#endif
}
/* Return 1 if type TYPE contains any pointers. */
static int
contains_pointers_p (type)
tree type;
{
switch (TREE_CODE (type))
{
case POINTER_TYPE:
case REFERENCE_TYPE:
/* I'm not sure whether OFFSET_TYPE needs this treatment,
so I'll play safe and return 1. */
case OFFSET_TYPE:
return 1;
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
{
tree fields;
/* For a type that has fields, see if the fields have pointers. */
for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
if (TREE_CODE (fields) == FIELD_DECL
&& contains_pointers_p (TREE_TYPE (fields)))
return 1;
return 0;
}
case ARRAY_TYPE:
/* An array type contains pointers if its element type does. */
return contains_pointers_p (TREE_TYPE (type));
default:
return 0;
}
}
/* Output something to declare an external symbol to the assembler.
(Most assemblers don't need this, so we normally output nothing.)
Do nothing if DECL is not external. */
void
assemble_external (decl)
tree decl;
{
#ifdef ASM_OUTPUT_EXTERNAL
if (TREE_CODE_CLASS (TREE_CODE (decl)) == 'd'
&& DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
{
rtx rtl = DECL_RTL (decl);
if (GET_CODE (rtl) == MEM && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
&& ! SYMBOL_REF_USED (XEXP (rtl, 0)))
{
/* Some systems do require some output. */
SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
}
}
#endif
}
/* Similar, for calling a library function FUN. */
void
assemble_external_libcall (fun)
rtx fun;
{
#ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
/* Declare library function name external when first used, if nec. */
if (! SYMBOL_REF_USED (fun))
{
SYMBOL_REF_USED (fun) = 1;
ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
}
#endif
}
/* Declare the label NAME global. */
void
assemble_global (name)
char *name;
{
ASM_GLOBALIZE_LABEL (asm_out_file, name);
}
/* Assemble a label named NAME. */
void
assemble_label (name)
char *name;
{
ASM_OUTPUT_LABEL (asm_out_file, name);
}
/* Output to FILE a reference to the assembler name of a C-level name NAME.
If NAME starts with a *, the rest of NAME is output verbatim.
Otherwise NAME is transformed in an implementation-defined way
(usually by the addition of an underscore).
Many macros in the tm file are defined to call this function. */
void
assemble_name (file, name)
FILE *file;
char *name;
{
char *real_name;
tree id;
STRIP_NAME_ENCODING (real_name, name);
if (flag_prefix_function_name
&& ! bcmp (real_name, CHKR_PREFIX, CHKR_PREFIX_SIZE))
real_name = real_name + CHKR_PREFIX_SIZE;
id = maybe_get_identifier (real_name);
if (id)
TREE_SYMBOL_REFERENCED (id) = 1;
if (name[0] == '*')
fputs (&name[1], file);
else
ASM_OUTPUT_LABELREF (file, name);
}
/* Allocate SIZE bytes writable static space with a gensym name
and return an RTX to refer to its address. */
rtx
assemble_static_space (size)
int size;
{
char name[12];
char *namestring;
rtx x;
#if 0
if (flag_shared_data)
data_section ();
#endif
ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
++const_labelno;
namestring = (char *) obstack_alloc (saveable_obstack,
strlen (name) + 2);
strcpy (namestring, name);
x = gen_rtx_SYMBOL_REF (Pmode, namestring);
#ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
BIGGEST_ALIGNMENT);
#else
#ifdef ASM_OUTPUT_ALIGNED_LOCAL
ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
#else
{
/* Round size up to multiple of BIGGEST_ALIGNMENT bits
so that each uninitialized object starts on such a boundary. */
int rounded = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
/ (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
* (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
}
#endif
#endif
return x;
}
/* Assemble the static constant template for function entry trampolines.
This is done at most once per compilation.
Returns an RTX for the address of the template. */
#ifdef TRAMPOLINE_TEMPLATE
rtx
assemble_trampoline_template ()
{
char label[256];
char *name;
int align;
/* By default, put trampoline templates in read-only data section. */
#ifdef TRAMPOLINE_SECTION
TRAMPOLINE_SECTION ();
#else
readonly_data_section ();
#endif
/* Write the assembler code to define one. */
align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
if (align > 0)
ASM_OUTPUT_ALIGN (asm_out_file, align);
ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LTRAMP", 0);
TRAMPOLINE_TEMPLATE (asm_out_file);
/* Record the rtl to refer to it. */
ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
name
= (char *) obstack_copy0 (&permanent_obstack, label, strlen (label));
return gen_rtx_SYMBOL_REF (Pmode, name);
}
#endif
/* Assemble the integer constant X into an object of SIZE bytes.
X must be either a CONST_INT or CONST_DOUBLE.
Return 1 if we were able to output the constant, otherwise 0. If FORCE is
non-zero, abort if we can't output the constant. */
int
assemble_integer (x, size, force)
rtx x;
int size;
int force;
{
/* First try to use the standard 1, 2, 4, 8, and 16 byte
ASM_OUTPUT... macros. */
switch (size)
{
#ifdef ASM_OUTPUT_CHAR
case 1:
ASM_OUTPUT_CHAR (asm_out_file, x);
return 1;
#endif
#ifdef ASM_OUTPUT_SHORT
case 2:
ASM_OUTPUT_SHORT (asm_out_file, x);
return 1;
#endif
#ifdef ASM_OUTPUT_INT
case 4:
ASM_OUTPUT_INT (asm_out_file, x);
return 1;
#endif
#ifdef ASM_OUTPUT_DOUBLE_INT
case 8:
ASM_OUTPUT_DOUBLE_INT (asm_out_file, x);
return 1;
#endif
#ifdef ASM_OUTPUT_QUADRUPLE_INT
case 16:
ASM_OUTPUT_QUADRUPLE_INT (asm_out_file, x);
return 1;
#endif
}
/* If we couldn't do it that way, there are two other possibilities: First,
if the machine can output an explicit byte and this is a 1 byte constant,
we can use ASM_OUTPUT_BYTE. */
#ifdef ASM_OUTPUT_BYTE
if (size == 1 && GET_CODE (x) == CONST_INT)
{
ASM_OUTPUT_BYTE (asm_out_file, INTVAL (x));
return 1;
}
#endif
/* Finally, if SIZE is larger than a single word, try to output the constant
one word at a time. */
if (size > UNITS_PER_WORD)
{
int i;
enum machine_mode mode
= mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
rtx word;
for (i = 0; i < size / UNITS_PER_WORD; i++)
{
word = operand_subword (x, i, 0, mode);
if (word == 0)
break;
if (! assemble_integer (word, UNITS_PER_WORD, 0))
break;
}
if (i == size / UNITS_PER_WORD)
return 1;
/* If we output at least one word and then could not finish,
there is no valid way to continue. */
if (i > 0)
abort ();
}
if (force)
abort ();
return 0;
}
/* Assemble the floating-point constant D into an object of size MODE. */
void
assemble_real (d, mode)
REAL_VALUE_TYPE d;
enum machine_mode mode;
{
jmp_buf output_constant_handler;
if (setjmp (output_constant_handler))
{
error ("floating point trap outputting a constant");
#ifdef REAL_IS_NOT_DOUBLE
bzero ((char *) &d, sizeof d);
d = dconst0;
#else
d = 0;
#endif
}
set_float_handler (output_constant_handler);
switch (mode)
{
#ifdef ASM_OUTPUT_BYTE_FLOAT
case QFmode:
ASM_OUTPUT_BYTE_FLOAT (asm_out_file, d);
break;
#endif
#ifdef ASM_OUTPUT_SHORT_FLOAT
case HFmode:
ASM_OUTPUT_SHORT_FLOAT (asm_out_file, d);
break;
#endif
#ifdef ASM_OUTPUT_THREE_QUARTER_FLOAT
case TQFmode:
ASM_OUTPUT_THREE_QUARTER_FLOAT (asm_out_file, d);
break;
#endif
#ifdef ASM_OUTPUT_FLOAT
case SFmode:
ASM_OUTPUT_FLOAT (asm_out_file, d);
break;
#endif
#ifdef ASM_OUTPUT_DOUBLE
case DFmode:
ASM_OUTPUT_DOUBLE (asm_out_file, d);
break;
#endif
#ifdef ASM_OUTPUT_LONG_DOUBLE
case XFmode:
case TFmode:
ASM_OUTPUT_LONG_DOUBLE (asm_out_file, d);
break;
#endif
default:
abort ();
}
set_float_handler (NULL_PTR);
}
/* Here we combine duplicate floating constants to make
CONST_DOUBLE rtx's, and force those out to memory when necessary. */
/* Chain of all CONST_DOUBLE rtx's constructed for the current function.
They are chained through the CONST_DOUBLE_CHAIN.
A CONST_DOUBLE rtx has CONST_DOUBLE_MEM != cc0_rtx iff it is on this chain.
In that case, CONST_DOUBLE_MEM is either a MEM,
or const0_rtx if no MEM has been made for this CONST_DOUBLE yet.
(CONST_DOUBLE_MEM is used only for top-level functions.
See force_const_mem for explanation.) */
static rtx const_double_chain;
/* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair of ints.
For an integer, I0 is the low-order word and I1 is the high-order word.
For a real number, I0 is the word with the low address
and I1 is the word with the high address. */
rtx
immed_double_const (i0, i1, mode)
HOST_WIDE_INT i0, i1;
enum machine_mode mode;
{
register rtx r;
if (GET_MODE_CLASS (mode) == MODE_INT
|| GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
{
/* We clear out all bits that don't belong in MODE, unless they and our
sign bit are all one. So we get either a reasonable negative value
or a reasonable unsigned value for this mode. */
int width = GET_MODE_BITSIZE (mode);
if (width < HOST_BITS_PER_WIDE_INT
&& ((i0 & ((HOST_WIDE_INT) (-1) << (width - 1)))
!= ((HOST_WIDE_INT) (-1) << (width - 1))))
i0 &= ((HOST_WIDE_INT) 1 << width) - 1, i1 = 0;
else if (width == HOST_BITS_PER_WIDE_INT
&& ! (i1 == ~0 && i0 < 0))
i1 = 0;
else if (width > 2 * HOST_BITS_PER_WIDE_INT)
/* We cannot represent this value as a constant. */
abort ();
/* If this would be an entire word for the target, but is not for
the host, then sign-extend on the host so that the number will look
the same way on the host that it would on the target.
For example, when building a 64 bit alpha hosted 32 bit sparc
targeted compiler, then we want the 32 bit unsigned value -1 to be
represented as a 64 bit value -1, and not as 0x00000000ffffffff.
The later confuses the sparc backend. */
if (BITS_PER_WORD < HOST_BITS_PER_WIDE_INT && BITS_PER_WORD == width
&& (i0 & ((HOST_WIDE_INT) 1 << (width - 1))))
i0 |= ((HOST_WIDE_INT) (-1) << width);
/* If MODE fits within HOST_BITS_PER_WIDE_INT, always use a CONST_INT.
??? Strictly speaking, this is wrong if we create a CONST_INT
for a large unsigned constant with the size of MODE being
HOST_BITS_PER_WIDE_INT and later try to interpret that constant in a
wider mode. In that case we will mis-interpret it as a negative
number.
Unfortunately, the only alternative is to make a CONST_DOUBLE
for any constant in any mode if it is an unsigned constant larger
than the maximum signed integer in an int on the host. However,
doing this will break everyone that always expects to see a CONST_INT
for SImode and smaller.
We have always been making CONST_INTs in this case, so nothing new
is being broken. */
if (width <= HOST_BITS_PER_WIDE_INT)
i1 = (i0 < 0) ? ~(HOST_WIDE_INT) 0 : 0;
/* If this integer fits in one word, return a CONST_INT. */
if ((i1 == 0 && i0 >= 0)
|| (i1 == ~0 && i0 < 0))
return GEN_INT (i0);
/* We use VOIDmode for integers. */
mode = VOIDmode;
}
/* Search the chain for an existing CONST_DOUBLE with the right value.
If one is found, return it. */
for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r))
if (CONST_DOUBLE_LOW (r) == i0 && CONST_DOUBLE_HIGH (r) == i1
&& GET_MODE (r) == mode)
return r;
/* No; make a new one and add it to the chain.
We may be called by an optimizer which may be discarding any memory
allocated during its processing (such as combine and loop). However,
we will be leaving this constant on the chain, so we cannot tolerate
freed memory. So switch to saveable_obstack for this allocation
and then switch back if we were in current_obstack. */
push_obstacks_nochange ();
rtl_in_saveable_obstack ();
r = gen_rtx_CONST_DOUBLE (mode, NULL_RTX, i0, i1);
pop_obstacks ();
/* Don't touch const_double_chain in nested function; see force_const_mem.
Also, don't touch it if not inside any function. */
if (outer_function_chain == 0 && current_function_decl != 0)
{
CONST_DOUBLE_CHAIN (r) = const_double_chain;
const_double_chain = r;
}
/* Store const0_rtx in mem-slot since this CONST_DOUBLE is on the chain.
Actual use of mem-slot is only through force_const_mem. */
CONST_DOUBLE_MEM (r) = const0_rtx;
return r;
}
/* Return a CONST_DOUBLE for a specified `double' value
and machine mode. */
rtx
immed_real_const_1 (d, mode)
REAL_VALUE_TYPE d;
enum machine_mode mode;
{
union real_extract u;
register rtx r;
/* Get the desired `double' value as a sequence of ints
since that is how they are stored in a CONST_DOUBLE. */
u.d = d;
/* Detect special cases. */
if (REAL_VALUES_IDENTICAL (dconst0, d))
return CONST0_RTX (mode);
/* Check for NaN first, because some ports (specifically the i386) do not
emit correct ieee-fp code by default, and thus will generate a core
dump here if we pass a NaN to REAL_VALUES_EQUAL and if REAL_VALUES_EQUAL
does a floating point comparison. */
else if (! REAL_VALUE_ISNAN (d) && REAL_VALUES_EQUAL (dconst1, d))
return CONST1_RTX (mode);
if (sizeof u == sizeof (HOST_WIDE_INT))
return immed_double_const (u.i[0], 0, mode);
if (sizeof u == 2 * sizeof (HOST_WIDE_INT))
return immed_double_const (u.i[0], u.i[1], mode);
/* The rest of this function handles the case where
a float value requires more than 2 ints of space.
It will be deleted as dead code on machines that don't need it. */
/* Search the chain for an existing CONST_DOUBLE with the right value.
If one is found, return it. */
for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r))
if (! bcmp ((char *) &CONST_DOUBLE_LOW (r), (char *) &u, sizeof u)
&& GET_MODE (r) == mode)
return r;
/* No; make a new one and add it to the chain.
We may be called by an optimizer which may be discarding any memory
allocated during its processing (such as combine and loop). However,
we will be leaving this constant on the chain, so we cannot tolerate
freed memory. So switch to saveable_obstack for this allocation
and then switch back if we were in current_obstack. */
push_obstacks_nochange ();
rtl_in_saveable_obstack ();
r = rtx_alloc (CONST_DOUBLE);
PUT_MODE (r, mode);
bcopy ((char *) &u, (char *) &CONST_DOUBLE_LOW (r), sizeof u);
pop_obstacks ();
/* Don't touch const_double_chain in nested function; see force_const_mem.
Also, don't touch it if not inside any function. */
if (outer_function_chain == 0 && current_function_decl != 0)
{
CONST_DOUBLE_CHAIN (r) = const_double_chain;
const_double_chain = r;
}
/* Store const0_rtx in CONST_DOUBLE_MEM since this CONST_DOUBLE is on the
chain, but has not been allocated memory. Actual use of CONST_DOUBLE_MEM
is only through force_const_mem. */
CONST_DOUBLE_MEM (r) = const0_rtx;
return r;
}
/* Return a CONST_DOUBLE rtx for a value specified by EXP,
which must be a REAL_CST tree node. */
rtx
immed_real_const (exp)
tree exp;
{
return immed_real_const_1 (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)));
}
/* At the end of a function, forget the memory-constants
previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
Also clear out real_constant_chain and clear out all the chain-pointers. */
void
clear_const_double_mem ()
{
register rtx r, next;
/* Don't touch CONST_DOUBLE_MEM for nested functions.
See force_const_mem for explanation. */
if (outer_function_chain != 0)
return;
for (r = const_double_chain; r; r = next)
{
next = CONST_DOUBLE_CHAIN (r);
CONST_DOUBLE_CHAIN (r) = 0;
CONST_DOUBLE_MEM (r) = cc0_rtx;
}
const_double_chain = 0;
}
/* Given an expression EXP with a constant value,
reduce it to the sum of an assembler symbol and an integer.
Store them both in the structure *VALUE.
Abort if EXP does not reduce. */
struct addr_const
{
rtx base;
HOST_WIDE_INT offset;
};
static void
decode_addr_const (exp, value)
tree exp;
struct addr_const *value;
{
register tree target = TREE_OPERAND (exp, 0);
register int offset = 0;
register rtx x;
while (1)
{
if (TREE_CODE (target) == COMPONENT_REF
&& (TREE_CODE (DECL_FIELD_BITPOS (TREE_OPERAND (target, 1)))
== INTEGER_CST))
{
offset += TREE_INT_CST_LOW (DECL_FIELD_BITPOS (TREE_OPERAND (target, 1))) / BITS_PER_UNIT;
target = TREE_OPERAND (target, 0);
}
else if (TREE_CODE (target) == ARRAY_REF)
{
if (TREE_CODE (TREE_OPERAND (target, 1)) != INTEGER_CST
|| TREE_CODE (TYPE_SIZE (TREE_TYPE (target))) != INTEGER_CST)
abort ();
offset += ((TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (target)))
* TREE_INT_CST_LOW (TREE_OPERAND (target, 1)))
/ BITS_PER_UNIT);
target = TREE_OPERAND (target, 0);
}
else
break;
}
switch (TREE_CODE (target))
{
case VAR_DECL:
case FUNCTION_DECL:
x = DECL_RTL (target);
break;
case LABEL_DECL:
x = gen_rtx_MEM (FUNCTION_MODE,
gen_rtx_LABEL_REF (VOIDmode,
label_rtx (TREE_OPERAND (exp, 0))));
break;
case REAL_CST:
case STRING_CST:
case COMPLEX_CST:
case CONSTRUCTOR:
case INTEGER_CST:
x = TREE_CST_RTL (target);
break;
default:
abort ();
}
if (GET_CODE (x) != MEM)
abort ();
x = XEXP (x, 0);
value->base = x;
value->offset = offset;
}
/* Uniquize all constants that appear in memory.
Each constant in memory thus far output is recorded
in `const_hash_table' with a `struct constant_descriptor'
that contains a polish representation of the value of
the constant.
We cannot store the trees in the hash table
because the trees may be temporary. */
struct constant_descriptor
{
struct constant_descriptor *next;
char *label;
char contents[1];
};
#define HASHBITS 30
#define MAX_HASH_TABLE 1009
static struct constant_descriptor *const_hash_table[MAX_HASH_TABLE];
/* Compute a hash code for a constant expression. */
static int
const_hash (exp)
tree exp;
{
register char *p;
register int len, hi, i;
register enum tree_code code = TREE_CODE (exp);
/* Either set P and LEN to the address and len of something to hash and
exit the switch or return a value. */
switch (code)
{
case INTEGER_CST:
p = (char *) &TREE_INT_CST_LOW (exp);
len = 2 * sizeof TREE_INT_CST_LOW (exp);
break;
case REAL_CST:
p = (char *) &TREE_REAL_CST (exp);
len = sizeof TREE_REAL_CST (exp);
break;
case STRING_CST:
p = TREE_STRING_POINTER (exp);
len = TREE_STRING_LENGTH (exp);
break;
case COMPLEX_CST:
return (const_hash (TREE_REALPART (exp)) * 5
+ const_hash (TREE_IMAGPART (exp)));
case CONSTRUCTOR:
if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
{
len = int_size_in_bytes (TREE_TYPE (exp));
p = (char *) alloca (len);
get_set_constructor_bytes (exp, (unsigned char *) p, len);
break;
}
else
{
register tree link;
/* For record type, include the type in the hashing.
We do not do so for array types
because (1) the sizes of the elements are sufficient
and (2) distinct array types can have the same constructor.
Instead, we include the array size because the constructor could
be shorter. */
if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
hi = ((unsigned long) TREE_TYPE (exp) & ((1 << HASHBITS) - 1))
% MAX_HASH_TABLE;
else
hi = ((5 + int_size_in_bytes (TREE_TYPE (exp)))
& ((1 << HASHBITS) - 1)) % MAX_HASH_TABLE;
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
if (TREE_VALUE (link))
hi
= (hi * 603 + const_hash (TREE_VALUE (link))) % MAX_HASH_TABLE;
return hi;
}
case ADDR_EXPR:
{
struct addr_const value;
decode_addr_const (exp, &value);
if (GET_CODE (value.base) == SYMBOL_REF)
{
/* Don't hash the address of the SYMBOL_REF;
only use the offset and the symbol name. */
hi = value.offset;
p = XSTR (value.base, 0);
for (i = 0; p[i] != 0; i++)
hi = ((hi * 613) + (unsigned) (p[i]));
}
else if (GET_CODE (value.base) == LABEL_REF)
hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
hi &= (1 << HASHBITS) - 1;
hi %= MAX_HASH_TABLE;
}
return hi;
case PLUS_EXPR:
case MINUS_EXPR:
return (const_hash (TREE_OPERAND (exp, 0)) * 9
+ const_hash (TREE_OPERAND (exp, 1)));
case NOP_EXPR:
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
return const_hash (TREE_OPERAND (exp, 0)) * 7 + 2;
default:
abort ();
}
/* Compute hashing function */
hi = len;
for (i = 0; i < len; i++)
hi = ((hi * 613) + (unsigned) (p[i]));
hi &= (1 << HASHBITS) - 1;
hi %= MAX_HASH_TABLE;
return hi;
}
/* Compare a constant expression EXP with a constant-descriptor DESC.
Return 1 if DESC describes a constant with the same value as EXP. */
static int
compare_constant (exp, desc)
tree exp;
struct constant_descriptor *desc;
{
return 0 != compare_constant_1 (exp, desc->contents);
}
/* Compare constant expression EXP with a substring P of a constant descriptor.
If they match, return a pointer to the end of the substring matched.
If they do not match, return 0.
Since descriptors are written in polish prefix notation,
this function can be used recursively to test one operand of EXP
against a subdescriptor, and if it succeeds it returns the
address of the subdescriptor for the next operand. */
static char *
compare_constant_1 (exp, p)
tree exp;
char *p;
{
register char *strp;
register int len;
register enum tree_code code = TREE_CODE (exp);
if (code != (enum tree_code) *p++)
return 0;
/* Either set STRP, P and LEN to pointers and length to compare and exit the
switch, or return the result of the comparison. */
switch (code)
{
case INTEGER_CST:
/* Integer constants are the same only if the same width of type. */
if (*p++ != TYPE_PRECISION (TREE_TYPE (exp)))
return 0;
strp = (char *) &TREE_INT_CST_LOW (exp);
len = 2 * sizeof TREE_INT_CST_LOW (exp);
break;
case REAL_CST:
/* Real constants are the same only if the same width of type. */
if (*p++ != TYPE_PRECISION (TREE_TYPE (exp)))
return 0;
strp = (char *) &TREE_REAL_CST (exp);
len = sizeof TREE_REAL_CST (exp);
break;
case STRING_CST:
if (flag_writable_strings)
return 0;
if (*p++ != TYPE_MODE (TREE_TYPE (exp)))
return 0;
strp = TREE_STRING_POINTER (exp);
len = TREE_STRING_LENGTH (exp);
if (bcmp ((char *) &TREE_STRING_LENGTH (exp), p,
sizeof TREE_STRING_LENGTH (exp)))
return 0;
p += sizeof TREE_STRING_LENGTH (exp);
break;
case COMPLEX_CST:
p = compare_constant_1 (TREE_REALPART (exp), p);
if (p == 0)
return 0;
return compare_constant_1 (TREE_IMAGPART (exp), p);
case CONSTRUCTOR:
if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
{
int xlen = len = int_size_in_bytes (TREE_TYPE (exp));
strp = (char *) alloca (len);
get_set_constructor_bytes (exp, (unsigned char *) strp, len);
if (bcmp ((char *) &xlen, p, sizeof xlen))
return 0;
p += sizeof xlen;
break;
}
else
{
register tree link;
int length = list_length (CONSTRUCTOR_ELTS (exp));
tree type;
int have_purpose = 0;
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
if (TREE_PURPOSE (link))
have_purpose = 1;
if (bcmp ((char *) &length, p, sizeof length))
return 0;
p += sizeof length;
/* For record constructors, insist that the types match.
For arrays, just verify both constructors are for arrays.
Then insist that either both or none have any TREE_PURPOSE
values. */
if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
type = TREE_TYPE (exp);
else
type = 0;
if (bcmp ((char *) &type, p, sizeof type))
return 0;
p += sizeof type;
if (bcmp ((char *) &have_purpose, p, sizeof have_purpose))
return 0;
p += sizeof have_purpose;
/* For arrays, insist that the size in bytes match. */
if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
{
HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (exp));
if (bcmp ((char *) &size, p, sizeof size))
return 0;
p += sizeof size;
}
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
{
if (TREE_VALUE (link))
{
if ((p = compare_constant_1 (TREE_VALUE (link), p)) == 0)
return 0;
}
else
{
tree zero = 0;
if (bcmp ((char *) &zero, p, sizeof zero))
return 0;
p += sizeof zero;
}
if (TREE_PURPOSE (link)
&& TREE_CODE (TREE_PURPOSE (link)) == FIELD_DECL)
{
if (bcmp ((char *) &TREE_PURPOSE (link), p,
sizeof TREE_PURPOSE (link)))
return 0;
p += sizeof TREE_PURPOSE (link);
}
else if (TREE_PURPOSE (link))
{
if ((p = compare_constant_1 (TREE_PURPOSE (link), p)) == 0)
return 0;
}
else if (have_purpose)
{
int zero = 0;
if (bcmp ((char *) &zero, p, sizeof zero))
return 0;
p += sizeof zero;
}
}
return p;
}
case ADDR_EXPR:
{
struct addr_const value;
decode_addr_const (exp, &value);
strp = (char *) &value.offset;
len = sizeof value.offset;
/* Compare the offset. */
while (--len >= 0)
if (*p++ != *strp++)
return 0;
/* Compare symbol name. */
strp = XSTR (value.base, 0);
len = strlen (strp) + 1;
}
break;
case PLUS_EXPR:
case MINUS_EXPR:
p = compare_constant_1 (TREE_OPERAND (exp, 0), p);
if (p == 0)
return 0;
return compare_constant_1 (TREE_OPERAND (exp, 1), p);
case NOP_EXPR:
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
return compare_constant_1 (TREE_OPERAND (exp, 0), p);
default:
abort ();
}
/* Compare constant contents. */
while (--len >= 0)
if (*p++ != *strp++)
return 0;
return p;
}
/* Construct a constant descriptor for the expression EXP.
It is up to the caller to enter the descriptor in the hash table. */
static struct constant_descriptor *
record_constant (exp)
tree exp;
{
struct constant_descriptor *next = 0;
char *label = 0;
/* Make a struct constant_descriptor. The first two pointers will
be filled in later. Here we just leave space for them. */
obstack_grow (&permanent_obstack, (char *) &next, sizeof next);
obstack_grow (&permanent_obstack, (char *) &label, sizeof label);
record_constant_1 (exp);
return (struct constant_descriptor *) obstack_finish (&permanent_obstack);
}
/* Add a description of constant expression EXP
to the object growing in `permanent_obstack'.
No need to return its address; the caller will get that
from the obstack when the object is complete. */
static void
record_constant_1 (exp)
tree exp;
{
register char *strp;
register int len;
register enum tree_code code = TREE_CODE (exp);
obstack_1grow (&permanent_obstack, (unsigned int) code);
switch (code)
{
case INTEGER_CST:
obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp)));
strp = (char *) &TREE_INT_CST_LOW (exp);
len = 2 * sizeof TREE_INT_CST_LOW (exp);
break;
case REAL_CST:
obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp)));
strp = (char *) &TREE_REAL_CST (exp);
len = sizeof TREE_REAL_CST (exp);
break;
case STRING_CST:
if (flag_writable_strings)
return;
obstack_1grow (&permanent_obstack, TYPE_MODE (TREE_TYPE (exp)));
strp = TREE_STRING_POINTER (exp);
len = TREE_STRING_LENGTH (exp);
obstack_grow (&permanent_obstack, (char *) &TREE_STRING_LENGTH (exp),
sizeof TREE_STRING_LENGTH (exp));
break;
case COMPLEX_CST:
record_constant_1 (TREE_REALPART (exp));
record_constant_1 (TREE_IMAGPART (exp));
return;
case CONSTRUCTOR:
if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
{
int nbytes = int_size_in_bytes (TREE_TYPE (exp));
obstack_grow (&permanent_obstack, &nbytes, sizeof (nbytes));
obstack_blank (&permanent_obstack, nbytes);
get_set_constructor_bytes
(exp, (unsigned char *) permanent_obstack.next_free-nbytes,
nbytes);
return;
}
else
{
register tree link;
int length = list_length (CONSTRUCTOR_ELTS (exp));
tree type;
int have_purpose = 0;
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
if (TREE_PURPOSE (link))
have_purpose = 1;
obstack_grow (&permanent_obstack, (char *) &length, sizeof length);
/* For record constructors, insist that the types match.
For arrays, just verify both constructors are for arrays.
Then insist that either both or none have any TREE_PURPOSE
values. */
if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
type = TREE_TYPE (exp);
else
type = 0;
obstack_grow (&permanent_obstack, (char *) &type, sizeof type);
obstack_grow (&permanent_obstack, (char *) &have_purpose,
sizeof have_purpose);
/* For arrays, insist that the size in bytes match. */
if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
{
HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (exp));
obstack_grow (&permanent_obstack, (char *) &size, sizeof size);
}
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
{
if (TREE_VALUE (link))
record_constant_1 (TREE_VALUE (link));
else
{
tree zero = 0;
obstack_grow (&permanent_obstack,
(char *) &zero, sizeof zero);
}
if (TREE_PURPOSE (link)
&& TREE_CODE (TREE_PURPOSE (link)) == FIELD_DECL)
obstack_grow (&permanent_obstack,
(char *) &TREE_PURPOSE (link),
sizeof TREE_PURPOSE (link));
else if (TREE_PURPOSE (link))
record_constant_1 (TREE_PURPOSE (link));
else if (have_purpose)
{
int zero = 0;
obstack_grow (&permanent_obstack,
(char *) &zero, sizeof zero);
}
}
}
return;
case ADDR_EXPR:
{
struct addr_const value;
decode_addr_const (exp, &value);
/* Record the offset. */
obstack_grow (&permanent_obstack,
(char *) &value.offset, sizeof value.offset);
/* Record the symbol name. */
obstack_grow (&permanent_obstack, XSTR (value.base, 0),
strlen (XSTR (value.base, 0)) + 1);
}
return;
case PLUS_EXPR:
case MINUS_EXPR:
record_constant_1 (TREE_OPERAND (exp, 0));
record_constant_1 (TREE_OPERAND (exp, 1));
return;
case NOP_EXPR:
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
record_constant_1 (TREE_OPERAND (exp, 0));
return;
default:
abort ();
}
/* Record constant contents. */
obstack_grow (&permanent_obstack, strp, len);
}
/* Record a list of constant expressions that were passed to
output_constant_def but that could not be output right away. */
struct deferred_constant
{
struct deferred_constant *next;
tree exp;
int reloc;
int labelno;
};
static struct deferred_constant *deferred_constants;
/* Another list of constants which should be output after the
function. */
static struct deferred_constant *after_function_constants;
/* Nonzero means defer output of addressed subconstants
(i.e., those for which output_constant_def is called.) */
static int defer_addressed_constants_flag;
/* Start deferring output of subconstants. */
void
defer_addressed_constants ()
{
defer_addressed_constants_flag++;
}
/* Stop deferring output of subconstants,
and output now all those that have been deferred. */
void
output_deferred_addressed_constants ()
{
struct deferred_constant *p, *next;
defer_addressed_constants_flag--;
if (defer_addressed_constants_flag > 0)
return;
for (p = deferred_constants; p; p = next)
{
output_constant_def_contents (p->exp, p->reloc, p->labelno);
next = p->next;
free (p);
}
deferred_constants = 0;
}
/* Output any constants which should appear after a function. */
static void
output_after_function_constants ()
{
struct deferred_constant *p, *next;
for (p = after_function_constants; p; p = next)
{
output_constant_def_contents (p->exp, p->reloc, p->labelno);
next = p->next;
free (p);
}
after_function_constants = 0;
}
/* Make a copy of the whole tree structure for a constant.
This handles the same types of nodes that compare_constant
and record_constant handle. */
static tree
copy_constant (exp)
tree exp;
{
switch (TREE_CODE (exp))
{
case ADDR_EXPR:
/* For ADDR_EXPR, we do not want to copy the decl whose address
is requested. We do want to copy constants though. */
if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == 'c')
return build1 (TREE_CODE (exp), TREE_TYPE (exp),
copy_constant (TREE_OPERAND (exp, 0)));
else
return copy_node (exp);
case INTEGER_CST:
case REAL_CST:
case STRING_CST:
return copy_node (exp);
case COMPLEX_CST:
return build_complex (TREE_TYPE (exp),
copy_constant (TREE_REALPART (exp)),
copy_constant (TREE_IMAGPART (exp)));
case PLUS_EXPR:
case MINUS_EXPR:
return build (TREE_CODE (exp), TREE_TYPE (exp),
copy_constant (TREE_OPERAND (exp, 0)),
copy_constant (TREE_OPERAND (exp, 1)));
case NOP_EXPR:
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
return build1 (TREE_CODE (exp), TREE_TYPE (exp),
copy_constant (TREE_OPERAND (exp, 0)));
case CONSTRUCTOR:
{
tree copy = copy_node (exp);
tree list = copy_list (CONSTRUCTOR_ELTS (exp));
tree tail;
CONSTRUCTOR_ELTS (copy) = list;
for (tail = list; tail; tail = TREE_CHAIN (tail))
TREE_VALUE (tail) = copy_constant (TREE_VALUE (tail));
if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
for (tail = list; tail; tail = TREE_CHAIN (tail))
TREE_PURPOSE (tail) = copy_constant (TREE_PURPOSE (tail));
return copy;
}
default:
abort ();
}
}
/* Return an rtx representing a reference to constant data in memory
for the constant expression EXP.
If assembler code for such a constant has already been output,
return an rtx to refer to it.
Otherwise, output such a constant in memory (or defer it for later)
and generate an rtx for it.
The TREE_CST_RTL of EXP is set up to point to that rtx.
The const_hash_table records which constants already have label strings. */
rtx
output_constant_def (exp)
tree exp;
{
register int hash;
register struct constant_descriptor *desc;
char label[256];
char *found = 0;
int reloc;
register rtx def;
if (TREE_CST_RTL (exp))
return TREE_CST_RTL (exp);
/* Make sure any other constants whose addresses appear in EXP
are assigned label numbers. */
reloc = output_addressed_constants (exp);
/* Compute hash code of EXP. Search the descriptors for that hash code
to see if any of them describes EXP. If yes, the descriptor records
the label number already assigned. */
hash = const_hash (exp) % MAX_HASH_TABLE;
for (desc = const_hash_table[hash]; desc; desc = desc->next)
if (compare_constant (exp, desc))
{
found = desc->label;
break;
}
if (found == 0)
{
/* No constant equal to EXP is known to have been output.
Make a constant descriptor to enter EXP in the hash table.
Assign the label number and record it in the descriptor for
future calls to this function to find. */
/* Create a string containing the label name, in LABEL. */
ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
desc = record_constant (exp);
desc->next = const_hash_table[hash];
desc->label
= (char *) obstack_copy0 (&permanent_obstack, label, strlen (label));
const_hash_table[hash] = desc;
}
else
{
/* Create a string containing the label name, in LABEL. */
ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
}
/* We have a symbol name; construct the SYMBOL_REF and the MEM. */
push_obstacks_nochange ();
if (TREE_PERMANENT (exp))
end_temporary_allocation ();
def = gen_rtx_SYMBOL_REF (Pmode, desc->label);
TREE_CST_RTL (exp)
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), def);
RTX_UNCHANGING_P (TREE_CST_RTL (exp)) = 1;
if (AGGREGATE_TYPE_P (TREE_TYPE (exp)))
MEM_IN_STRUCT_P (TREE_CST_RTL (exp)) = 1;
pop_obstacks ();
/* Optionally set flags or add text to the name to record information
such as that it is a function name. If the name is changed, the macro
ASM_OUTPUT_LABELREF will have to know how to strip this information. */
#ifdef ENCODE_SECTION_INFO
ENCODE_SECTION_INFO (exp);
#endif
/* If this is the first time we've seen this particular constant,
output it (or defer its output for later). */
if (found == 0)
{
int after_function = 0;
#ifdef CONSTANT_AFTER_FUNCTION_P
if (current_function_decl != 0
&& CONSTANT_AFTER_FUNCTION_P (exp))
after_function = 1;
#endif
if (defer_addressed_constants_flag || after_function)
{
struct deferred_constant *p;
p = (struct deferred_constant *) xmalloc (sizeof (struct deferred_constant));
push_obstacks_nochange ();
suspend_momentary ();
p->exp = copy_constant (exp);
pop_obstacks ();
p->reloc = reloc;
p->labelno = const_labelno++;
if (after_function)
{
p->next = after_function_constants;
after_function_constants = p;
}
else
{
p->next = deferred_constants;
deferred_constants = p;
}
}
else
output_constant_def_contents (exp, reloc, const_labelno++);
}
return TREE_CST_RTL (exp);
}
/* Now output assembler code to define the label for EXP,
and follow it with the data of EXP. */
static void
output_constant_def_contents (exp, reloc, labelno)
tree exp;
int reloc;
int labelno;
{
int align;
if (IN_NAMED_SECTION (exp))
named_section (exp, NULL, reloc);
else
{
/* First switch to text section, except for writable strings. */
#ifdef SELECT_SECTION
SELECT_SECTION (exp, reloc);
#else
if (((TREE_CODE (exp) == STRING_CST) && flag_writable_strings)
|| (flag_pic && reloc))
data_section ();
else
readonly_data_section ();
#endif
}
/* Align the location counter as required by EXP's data type. */
align = TYPE_ALIGN (TREE_TYPE (exp));
#ifdef CONSTANT_ALIGNMENT
align = CONSTANT_ALIGNMENT (exp, align);
#endif
if (align > BITS_PER_UNIT)
ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
/* Output the label itself. */
ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LC", labelno);
/* Output the value of EXP. */
output_constant (exp,
(TREE_CODE (exp) == STRING_CST
? TREE_STRING_LENGTH (exp)
: int_size_in_bytes (TREE_TYPE (exp))));
}
/* Similar hash facility for making memory-constants
from constant rtl-expressions. It is used on RISC machines
where immediate integer arguments and constant addresses are restricted
so that such constants must be stored in memory.
This pool of constants is reinitialized for each function
so each function gets its own constants-pool that comes right before it.
All structures allocated here are discarded when functions are saved for
inlining, so they do not need to be allocated permanently. */
#define MAX_RTX_HASH_TABLE 61
static struct constant_descriptor **const_rtx_hash_table;
/* Structure to represent sufficient information about a constant so that
it can be output when the constant pool is output, so that function
integration can be done, and to simplify handling on machines that reference
constant pool as base+displacement. */
struct pool_constant
{
struct constant_descriptor *desc;
struct pool_constant *next;
enum machine_mode mode;
rtx constant;
int labelno;
int align;
int offset;
int mark;
};
/* Pointers to first and last constant in pool. */
static struct pool_constant *first_pool, *last_pool;
/* Current offset in constant pool (does not include any machine-specific
header. */
static int pool_offset;
/* Structure used to maintain hash table mapping symbols used to their
corresponding constants. */
struct pool_sym
{
char *label;
struct pool_constant *pool;
struct pool_sym *next;
};
static struct pool_sym **const_rtx_sym_hash_table;
/* Hash code for a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true.
The argument is XSTR (... , 0) */
#define SYMHASH(LABEL) \
((((unsigned long) (LABEL)) & ((1 << HASHBITS) - 1)) % MAX_RTX_HASH_TABLE)
/* Initialize constant pool hashing for next function. */
void
init_const_rtx_hash_table ()
{
const_rtx_hash_table
= ((struct constant_descriptor **)
oballoc (MAX_RTX_HASH_TABLE * sizeof (struct constant_descriptor *)));
const_rtx_sym_hash_table
= ((struct pool_sym **)
oballoc (MAX_RTX_HASH_TABLE * sizeof (struct pool_sym *)));
bzero ((char *) const_rtx_hash_table,
MAX_RTX_HASH_TABLE * sizeof (struct constant_descriptor *));
bzero ((char *) const_rtx_sym_hash_table,
MAX_RTX_HASH_TABLE * sizeof (struct pool_sym *));
first_pool = last_pool = 0;
pool_offset = 0;
}
/* Save and restore status for a nested function. */
void
save_varasm_status (p, context)
struct function *p;
tree context;
{
p->const_rtx_hash_table = const_rtx_hash_table;
p->const_rtx_sym_hash_table = const_rtx_sym_hash_table;
p->first_pool = first_pool;
p->last_pool = last_pool;
p->pool_offset = pool_offset;
p->const_double_chain = const_double_chain;
/* If we are pushing to toplevel, we can't reuse const_double_chain. */
if (context == NULL_TREE)
const_double_chain = 0;
}
void
restore_varasm_status (p)
struct function *p;
{
const_rtx_hash_table = p->const_rtx_hash_table;
const_rtx_sym_hash_table = p->const_rtx_sym_hash_table;
first_pool = p->first_pool;
last_pool = p->last_pool;
pool_offset = p->pool_offset;
const_double_chain = p->const_double_chain;
}
enum kind { RTX_DOUBLE, RTX_INT };
struct rtx_const
{
#ifdef ONLY_INT_FIELDS
unsigned int kind : 16;
unsigned int mode : 16;
#else
enum kind kind : 16;
enum machine_mode mode : 16;
#endif
union {
union real_extract du;
struct addr_const addr;
struct {HOST_WIDE_INT high, low;} di;
} un;
};
/* Express an rtx for a constant integer (perhaps symbolic)
as the sum of a symbol or label plus an explicit integer.
They are stored into VALUE. */
static void
decode_rtx_const (mode, x, value)
enum machine_mode mode;
rtx x;
struct rtx_const *value;
{
/* Clear the whole structure, including any gaps. */
{
int *p = (int *) value;
int *end = (int *) (value + 1);
while (p < end)
*p++ = 0;
}
value->kind = RTX_INT; /* Most usual kind. */
value->mode = mode;
switch (GET_CODE (x))
{
case CONST_DOUBLE:
value->kind = RTX_DOUBLE;
if (GET_MODE (x) != VOIDmode)
{
value->mode = GET_MODE (x);
bcopy ((char *) &CONST_DOUBLE_LOW (x),
(char *) &value->un.du, sizeof value->un.du);
}
else
{
value->un.di.low = CONST_DOUBLE_LOW (x);
value->un.di.high = CONST_DOUBLE_HIGH (x);
}
break;
case CONST_INT:
value->un.addr.offset = INTVAL (x);
break;
case SYMBOL_REF:
case LABEL_REF:
case PC:
value->un.addr.base = x;
break;
case CONST:
x = XEXP (x, 0);
if (GET_CODE (x) == PLUS)
{
value->un.addr.base = XEXP (x, 0);
if (GET_CODE (XEXP (x, 1)) != CONST_INT)
abort ();
value->un.addr.offset = INTVAL (XEXP (x, 1));
}
else if (GET_CODE (x) == MINUS)
{
value->un.addr.base = XEXP (x, 0);
if (GET_CODE (XEXP (x, 1)) != CONST_INT)
abort ();
value->un.addr.offset = - INTVAL (XEXP (x, 1));
}
else
abort ();
break;
default:
abort ();
}
if (value->kind == RTX_INT && value->un.addr.base != 0)
switch (GET_CODE (value->un.addr.base))
{
case SYMBOL_REF:
case LABEL_REF:
/* Use the string's address, not the SYMBOL_REF's address,
for the sake of addresses of library routines.
For a LABEL_REF, compare labels. */
value->un.addr.base = XEXP (value->un.addr.base, 0);
default:
break;
}
}
/* Given a MINUS expression, simplify it if both sides
include the same symbol. */
rtx
simplify_subtraction (x)
rtx x;
{
struct rtx_const val0, val1;
decode_rtx_const (GET_MODE (x), XEXP (x, 0), &val0);
decode_rtx_const (GET_MODE (x), XEXP (x, 1), &val1);
if (val0.un.addr.base == val1.un.addr.base)
return GEN_INT (val0.un.addr.offset - val1.un.addr.offset);
return x;
}
/* Compute a hash code for a constant RTL expression. */
static int
const_hash_rtx (mode, x)
enum machine_mode mode;
rtx x;
{
register int hi;
register size_t i;
struct rtx_const value;
decode_rtx_const (mode, x, &value);
/* Compute hashing function */
hi = 0;
for (i = 0; i < sizeof value / sizeof (int); i++)
hi += ((int *) &value)[i];
hi &= (1 << HASHBITS) - 1;
hi %= MAX_RTX_HASH_TABLE;
return hi;
}
/* Compare a constant rtl object X with a constant-descriptor DESC.
Return 1 if DESC describes a constant with the same value as X. */
static int
compare_constant_rtx (mode, x, desc)
enum machine_mode mode;
rtx x;
struct constant_descriptor *desc;
{
register int *p = (int *) desc->contents;
register int *strp;
register int len;
struct rtx_const value;
decode_rtx_const (mode, x, &value);