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gcc/gcc/varasm.c
Theodore Papadopoulo dd49a9ecc4 dwarf2out.c (output_cfa_loc): Fix typo in comment. 
* dwarf2out.c (output_cfa_loc): Fix typo in comment.
     * gcc.c (init_spec): Fix typo in comment.
     * varasm.c (data_section): Fix typo in comment.

From-SVN: r44855
2001-08-13 17:14:54 +02:00

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/* Output variables, constants and external declarations, for GNU compiler.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001 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 "rtl.h"
#include "tree.h"
#include "flags.h"
#include "function.h"
#include "expr.h"
#include "hard-reg-set.h"
#include "regs.h"
#include "output.h"
#include "real.h"
#include "toplev.h"
#include "obstack.h"
#include "hashtab.h"
#include "c-pragma.h"
#include "ggc.h"
#include "tm_p.h"
#include "debug.h"
#include "target.h"
#ifdef XCOFF_DEBUGGING_INFO
#include "xcoffout.h" /* Needed for external data
declarations for e.g. AIX 4.x. */
#endif
#ifndef TRAMPOLINE_ALIGNMENT
#define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
#endif
#ifndef ASM_STABS_OP
#define ASM_STABS_OP "\t.stabs\t"
#endif
/* Define the prefix to use when check_memory_usage_flag is enable. */
#define CHKR_PREFIX "_CHKR_"
#define CHKR_PREFIX_SIZE (sizeof (CHKR_PREFIX) - 1)
/* The (assembler) name of the first globally-visible object output. */
const char *first_global_object_name;
const char *weak_global_object_name;
extern struct obstack permanent_obstack;
#define obstack_chunk_alloc xmalloc
struct addr_const;
struct constant_descriptor;
struct rtx_const;
struct pool_constant;
#define MAX_RTX_HASH_TABLE 61
struct varasm_status
{
/* 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. */
struct constant_descriptor **x_const_rtx_hash_table;
struct pool_constant **x_const_rtx_sym_hash_table;
/* Pointers to first and last constant in pool. */
struct pool_constant *x_first_pool, *x_last_pool;
/* Current offset in constant pool (does not include any machine-specific
header). */
int x_pool_offset;
/* 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. */
rtx x_const_double_chain;
};
#define const_rtx_hash_table (cfun->varasm->x_const_rtx_hash_table)
#define const_rtx_sym_hash_table (cfun->varasm->x_const_rtx_sym_hash_table)
#define first_pool (cfun->varasm->x_first_pool)
#define last_pool (cfun->varasm->x_last_pool)
#define pool_offset (cfun->varasm->x_pool_offset)
#define const_double_chain (cfun->varasm->x_const_double_chain)
/* 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;
static const char *strip_reg_name PARAMS ((const char *));
static int contains_pointers_p PARAMS ((tree));
static void assemble_real_1 PARAMS ((PTR));
static void decode_addr_const PARAMS ((tree, struct addr_const *));
static int const_hash PARAMS ((tree));
static int compare_constant PARAMS ((tree,
struct constant_descriptor *));
static const unsigned char *compare_constant_1 PARAMS ((tree, const unsigned char *));
static struct constant_descriptor *record_constant PARAMS ((tree));
static void record_constant_1 PARAMS ((tree));
static tree copy_constant PARAMS ((tree));
static void output_constant_def_contents PARAMS ((tree, int, int));
static void decode_rtx_const PARAMS ((enum machine_mode, rtx,
struct rtx_const *));
static int const_hash_rtx PARAMS ((enum machine_mode, rtx));
static int compare_constant_rtx PARAMS ((enum machine_mode, rtx,
struct constant_descriptor *));
static struct constant_descriptor *record_constant_rtx PARAMS ((enum machine_mode,
rtx));
static struct pool_constant *find_pool_constant PARAMS ((struct function *, rtx));
static void mark_constant_pool PARAMS ((void));
static void mark_constants PARAMS ((rtx));
static int mark_constant PARAMS ((rtx *current_rtx, void *data));
static int output_addressed_constants PARAMS ((tree));
static void output_after_function_constants PARAMS ((void));
static unsigned HOST_WIDE_INT array_size_for_constructor PARAMS ((tree));
static void output_constructor PARAMS ((tree, int));
#ifdef ASM_WEAKEN_LABEL
static void remove_from_pending_weak_list PARAMS ((const char *));
#endif
#ifdef ASM_OUTPUT_BSS
static void asm_output_bss PARAMS ((FILE *, tree, const char *, int, int));
#endif
#ifdef BSS_SECTION_ASM_OP
#ifdef ASM_OUTPUT_ALIGNED_BSS
static void asm_output_aligned_bss PARAMS ((FILE *, tree, const char *,
int, int));
#endif
#endif /* BSS_SECTION_ASM_OP */
static void mark_pool_constant PARAMS ((struct pool_constant *));
static void mark_const_hash_entry PARAMS ((void *));
static int mark_const_str_htab_1 PARAMS ((void **, void *));
static void mark_const_str_htab PARAMS ((void *));
static hashval_t const_str_htab_hash PARAMS ((const void *x));
static int const_str_htab_eq PARAMS ((const void *x, const void *y));
static void const_str_htab_del PARAMS ((void *));
static void asm_emit_uninitialised PARAMS ((tree, const char*, int, int));
static void resolve_unique_section PARAMS ((tree, int));
static enum in_section { no_section, in_text, in_data, in_named
#ifdef BSS_SECTION_ASM_OP
, in_bss
#endif
#ifdef CTORS_SECTION_ASM_OP
, in_ctors
#endif
#ifdef DTORS_SECTION_ASM_OP
, in_dtors
#endif
#ifdef EXTRA_SECTIONS
, EXTRA_SECTIONS
#endif
} in_section = no_section;
/* Return a non-zero value if DECL has a section attribute. */
#ifndef IN_NAMED_SECTION
#define IN_NAMED_SECTION(DECL) \
((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
&& DECL_SECTION_NAME (DECL) != NULL_TREE)
#endif
/* Text of section name when in_section == in_named. */
static const 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 ALWAYS switch to data section, in case
it's not sure where it is. */
void
force_data_section ()
{
in_section = no_section;
data_section ();
}
/* 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 with attributes FLAGS. */
void
named_section_flags (name, flags, align)
const char *name;
unsigned int flags;
unsigned int align;
{
if (in_section != in_named || strcmp (name, in_named_name))
{
(* targetm.asm_out.named_section) (name, flags, align);
if (flags & SECTION_FORGET)
in_section = no_section;
else
{
in_named_name = ggc_strdup (name);
in_section = in_named;
}
}
}
/* 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;
const char *name;
int reloc;
{
unsigned int flags;
if (decl != NULL_TREE && !DECL_P (decl))
abort ();
if (name == NULL)
name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
flags = (* targetm.section_type_flags) (decl, name, reloc);
named_section_flags (name, flags, 0);
}
/* If required, set DECL_SECTION_NAME to a unique name. */
static void
resolve_unique_section (decl, reloc)
tree decl;
int reloc;
{
if (DECL_SECTION_NAME (decl) == NULL_TREE
&& (flag_function_sections
|| (targetm.have_named_sections
&& DECL_ONE_ONLY (decl))))
UNIQUE_SECTION (decl, reloc);
}
#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 ATTRIBUTE_UNUSED;
const char *name;
int size ATTRIBUTE_UNUSED, 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;
const 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 */
/* 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
if (targetm.have_named_sections)
named_section (NULL_TREE, ".gcc_except_table", 0);
else if (flag_pic)
data_section ();
else
readonly_data_section ();
#endif
}
/* Given NAME, a putative register name, discard any customary prefixes. */
static const char *
strip_reg_name (name)
const 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)
const 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 { const char *name; int number; } table[]
= ADDITIONAL_REGISTER_NAMES;
for (i = 0; i < (int) ARRAY_SIZE (table); 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 VAR_DECL or FUNCTION_DECL. DECL should
have static storage duration. In other words, it should not be an
automatic variable, including PARM_DECLs.
There is, however, one exception: this function handles variables
explicitly placed in a particular register by the user.
ASMSPEC, if not 0, is the string which the user specified as the
assembler symbol name.
This is never called for PARM_DECL nodes. */
void
make_decl_rtl (decl, asmspec)
tree decl;
const char *asmspec;
{
int top_level = (DECL_CONTEXT (decl) == NULL_TREE);
const char *name = 0;
const char *new_name = 0;
int reg_number;
/* Check that we are not being given an automatic variable. */
/* A weak alias has TREE_PUBLIC set but not the other bits. */
if (TREE_CODE (decl) == PARM_DECL
|| TREE_CODE (decl) == RESULT_DECL
|| (TREE_CODE (decl) == VAR_DECL
&& !TREE_STATIC (decl)
&& !TREE_PUBLIC (decl)
&& !DECL_EXTERNAL (decl)
&& !DECL_REGISTER (decl)))
abort ();
/* And that we were not given a type or a label. */
else if (TREE_CODE (decl) == TYPE_DECL
|| TREE_CODE (decl) == LABEL_DECL)
abort ();
/* For a duplicate declaration, we can be called twice on the
same DECL node. Don't discard the RTL already made. */
if (DECL_RTL_SET_P (decl))
{
/* 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
return;
}
new_name = name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
reg_number = decode_reg_name (asmspec);
if (reg_number == -2)
{
/* ASMSPEC is given, and not the name of a register. Mark the
name with a star so assemble_name won't munge it. */
char *starred = alloca (strlen (asmspec) + 2);
starred[0] = '*';
strcpy (starred + 1, asmspec);
new_name = starred;
}
if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
{
/* First detect errors in declaring global registers. */
if (reg_number == -1)
error_with_decl (decl, "register name not specified for `%s'");
else if (reg_number < 0)
error_with_decl (decl, "invalid register name for `%s'");
else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
error_with_decl (decl,
"data type of `%s' isn't suitable for a register");
else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
error_with_decl (decl,
"register specified for `%s' isn't suitable for data type");
/* Now handle properly declared static register variables. */
else
{
int nregs;
if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
{
DECL_INITIAL (decl) = 0;
error ("global register variable has initial value");
}
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. */
SET_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 (TREE_STATIC (decl))
{
/* Make this register global, so not usable for anything
else. */
#ifdef ASM_DECLARE_REGISTER_GLOBAL
ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
#endif
nregs = HARD_REGNO_NREGS (reg_number, DECL_MODE (decl));
while (nregs > 0)
globalize_reg (reg_number + --nregs);
}
/* As a register variable, it has no section. */
return;
}
}
/* Now handle ordinary static variables and functions (in memory).
Also handle vars declared register invalidly. */
if (reg_number >= 0 || reg_number == -3)
error_with_decl (decl,
"register name given for non-register variable `%s'");
/* Specifying a section attribute on a variable forces it into a
non-.bss section, and thus it cannot be common. */
if (TREE_CODE (decl) == VAR_DECL
&& DECL_SECTION_NAME (decl) != NULL_TREE
&& DECL_INITIAL (decl) == NULL_TREE
&& DECL_COMMON (decl))
DECL_COMMON (decl) = 0;
/* Can't use just the variable's own name for a variable
whose scope is less than the whole file, unless it's a member
of a local class (which will already be unambiguous).
Concatenate a distinguishing number. */
if (!top_level && !TREE_PUBLIC (decl)
&& ! (DECL_CONTEXT (decl) && TYPE_P (DECL_CONTEXT (decl)))
&& asmspec == 0
&& name == IDENTIFIER_POINTER (DECL_NAME (decl)))
{
char *label;
ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
var_labelno++;
new_name = label;
}
/* When -fprefix-function-name is used, the functions
names are prefixed. Only nested function names are not
prefixed. */
else if (flag_prefix_function_name && TREE_CODE (decl) == FUNCTION_DECL)
{
size_t name_len = IDENTIFIER_LENGTH (DECL_ASSEMBLER_NAME (decl));
char *pname;
pname = alloca (name_len + CHKR_PREFIX_SIZE + 1);
memcpy (pname, CHKR_PREFIX, CHKR_PREFIX_SIZE);
memcpy (pname + CHKR_PREFIX_SIZE, name, name_len + 1);
new_name = pname;
}
if (name != new_name)
{
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (new_name));
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
}
/* If this variable is to be treated as volatile, show its
tree node has side effects. */
if ((flag_volatile_global && TREE_CODE (decl) == VAR_DECL
&& TREE_PUBLIC (decl))
|| ((flag_volatile_static && TREE_CODE (decl) == VAR_DECL
&& (TREE_PUBLIC (decl) || TREE_STATIC (decl)))))
TREE_SIDE_EFFECTS (decl) = 1;
SET_DECL_RTL (decl, gen_rtx_MEM (DECL_MODE (decl),
gen_rtx_SYMBOL_REF (Pmode, name)));
SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = DECL_WEAK (decl);
if (TREE_CODE (decl) != FUNCTION_DECL)
set_mem_attributes (DECL_RTL (decl), decl, 1);
/* 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
}
/* 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));
}
/* Record an element in the table of global destructors. SYMBOL is
a SYMBOL_REF of the function to be called; PRIORITY is a number
between 0 and MAX_INIT_PRIORITY. */
void
default_stabs_asm_out_destructor (symbol, priority)
rtx symbol;
int priority ATTRIBUTE_UNUSED;
{
/* Tell GNU LD that this is part of the static destructor set.
This will work for any system that uses stabs, most usefully
aout systems. */
fprintf (asm_out_file, "%s\"___DTOR_LIST__\",22,0,0,", ASM_STABS_OP);
assemble_name (asm_out_file, XSTR (symbol, 0));
fputc ('\n', asm_out_file);
}
void
default_named_section_asm_out_destructor (symbol, priority)
rtx symbol;
int priority;
{
const char *section = ".dtors";
char buf[16];
/* ??? This only works reliably with the GNU linker. */
if (priority != DEFAULT_INIT_PRIORITY)
{
sprintf (buf, ".dtors.%.5u",
/* Invert the numbering so the linker puts us in the proper
order; constructors are run from right to left, and the
linker sorts in increasing order. */
MAX_INIT_PRIORITY - priority);
section = buf;
}
named_section_flags (section, SECTION_WRITE, POINTER_SIZE / BITS_PER_UNIT);
assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, 1);
}
#ifdef DTORS_SECTION_ASM_OP
void
dtors_section ()
{
if (in_section != in_dtors)
{
in_section = in_dtors;
fputs (DTORS_SECTION_ASM_OP, asm_out_file);
fputc ('\n', asm_out_file);
}
}
void
default_dtor_section_asm_out_destructor (symbol, priority)
rtx symbol;
int priority ATTRIBUTE_UNUSED;
{
dtors_section ();
assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, 1);
}
#endif
/* Likewise for global constructors. */
void
default_stabs_asm_out_constructor (symbol, priority)
rtx symbol;
int priority ATTRIBUTE_UNUSED;
{
/* Tell GNU LD that this is part of the static destructor set.
This will work for any system that uses stabs, most usefully
aout systems. */
fprintf (asm_out_file, "%s\"___CTOR_LIST__\",22,0,0,", ASM_STABS_OP);
assemble_name (asm_out_file, XSTR (symbol, 0));
fputc ('\n', asm_out_file);
}
void
default_named_section_asm_out_constructor (symbol, priority)
rtx symbol;
int priority;
{
const char *section = ".ctors";
char buf[16];
/* ??? This only works reliably with the GNU linker. */
if (priority != DEFAULT_INIT_PRIORITY)
{
sprintf (buf, ".ctors.%.5u",
/* Invert the numbering so the linker puts us in the proper
order; constructors are run from right to left, and the
linker sorts in increasing order. */
MAX_INIT_PRIORITY - priority);
section = buf;
}
named_section_flags (section, SECTION_WRITE, POINTER_SIZE / BITS_PER_UNIT);
assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, 1);
}
#ifdef CTORS_SECTION_ASM_OP
void
ctors_section ()
{
if (in_section != in_ctors)
{
in_section = in_ctors;
fputs (CTORS_SECTION_ASM_OP, asm_out_file);
fputc ('\n', asm_out_file);
}
}
void
default_ctor_section_asm_out_constructor (symbol, priority)
rtx symbol;
int priority ATTRIBUTE_UNUSED;
{
ctors_section ();
assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, 1);
}
#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;
const 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);
resolve_unique_section (decl, 0);
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);
/* Handle a user-specified function alignment.
Note that we still need to align to FUNCTION_BOUNDARY, as above,
because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
if (align_functions_log > align)
{
#ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
align_functions_log, align_functions-1);
#else
ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
#endif
}
#ifdef ASM_OUTPUT_FUNCTION_PREFIX
ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
#endif
(*debug_hooks->begin_function) (decl);
/* Make function name accessible from other files, if appropriate. */
if (TREE_PUBLIC (decl))
{
if (! first_global_object_name)
{
const char *p;
char *name;
STRIP_NAME_ENCODING (p, fnname);
name = permalloc (strlen (p) + 1);
strcpy (name, p);
if (! DECL_WEAK (decl) && ! DECL_ONE_ONLY (decl))
first_global_object_name = name;
else
weak_global_object_name = name;
}
#ifdef ASM_WEAKEN_LABEL
if (DECL_WEAK (decl))
{
ASM_WEAKEN_LABEL (asm_out_file, fnname);
/* Remove this function from the pending weak list so that
we do not emit multiple .weak directives for it. */
remove_from_pending_weak_list
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
}
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;
const 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;
{
/* Do no output if -fsyntax-only. */
if (flag_syntax_only)
return;
#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,
"%s0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\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, "%s0", 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)
const 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;
}
}
#if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
#define ASM_EMIT_LOCAL(decl, name, size, rounded) \
ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name, size, DECL_ALIGN (decl))
#else
#if defined ASM_OUTPUT_ALIGNED_LOCAL
#define ASM_EMIT_LOCAL(decl, name, size, rounded) \
ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl))
#else
#define ASM_EMIT_LOCAL(decl, name, size, rounded) \
ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded)
#endif
#endif
#if defined ASM_OUTPUT_ALIGNED_BSS
#define ASM_EMIT_BSS(decl, name, size, rounded) \
ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl))
#else
#if defined ASM_OUTPUT_BSS
#define ASM_EMIT_BSS(decl, name, size, rounded) \
ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded)
#else
#undef ASM_EMIT_BSS
#endif
#endif
#if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
#define ASM_EMIT_COMMON(decl, name, size, rounded) \
ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name, size, DECL_ALIGN (decl))
#else
#if defined ASM_OUTPUT_ALIGNED_COMMON
#define ASM_EMIT_COMMON(decl, name, size, rounded) \
ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl))
#else
#define ASM_EMIT_COMMON(decl, name, size, rounded) \
ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded)
#endif
#endif
static void
asm_emit_uninitialised (decl, name, size, rounded)
tree decl;
const char * name;
int size ATTRIBUTE_UNUSED;
int rounded ATTRIBUTE_UNUSED;
{
enum
{
asm_dest_common,
asm_dest_bss,
asm_dest_local
}
destination = asm_dest_local;
if (TREE_PUBLIC (decl))
{
#if defined ASM_EMIT_BSS
if (! DECL_COMMON (decl))
destination = asm_dest_bss;
else
#endif
destination = asm_dest_common;
}
if (flag_shared_data)
{
switch (destination)
{
#ifdef ASM_OUTPUT_SHARED_BSS
case asm_dest_bss:
ASM_OUTPUT_SHARED_BSS (asm_out_file, decl, name, size, rounded);
return;
#endif
#ifdef ASM_OUTPUT_SHARED_COMMON
case asm_dest_common:
ASM_OUTPUT_SHARED_COMMON (asm_out_file, name, size, rounded);
return;
#endif
#ifdef ASM_OUTPUT_SHARED_LOCAL
case asm_dest_local:
ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
return;
#endif
default:
break;
}
}
resolve_unique_section (decl, 0);
switch (destination)
{
#ifdef ASM_EMIT_BSS
case asm_dest_bss:
ASM_EMIT_BSS (decl, name, size, rounded);
break;
#endif
case asm_dest_common:
ASM_EMIT_COMMON (decl, name, size, rounded);
break;
case asm_dest_local:
ASM_EMIT_LOCAL (decl, name, size, rounded);
break;
default:
abort ();
}
return;
}
/* 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 ATTRIBUTE_UNUSED;
int at_end ATTRIBUTE_UNUSED;
int dont_output_data;
{
register const char *name;
unsigned int align;
int reloc = 0;
rtx decl_rtl;
last_assemble_variable_decl = 0;
/* 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;
/* Do nothing for global register variables. */
if (DECL_RTL_SET_P (decl) && GET_CODE (DECL_RTL (decl)) == REG)
{
TREE_ASM_WRITTEN (decl) = 1;
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;
/* Make sure ENCODE_SECTION_INFO is invoked before we set ASM_WRITTEN. */
decl_rtl = DECL_RTL (decl);
TREE_ASM_WRITTEN (decl) = 1;
/* Do no output if -fsyntax-only. */
if (flag_syntax_only)
return;
app_disable ();
if (! dont_output_data
&& ! host_integerp (DECL_SIZE_UNIT (decl), 1))
{
error_with_decl (decl, "size of variable `%s' is too large");
return;
}
name = XSTR (XEXP (decl_rtl, 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))
{
const char *p;
char *xname;
STRIP_NAME_ENCODING (p, name);
xname = permalloc (strlen (p) + 1);
strcpy (xname, p);
first_global_object_name = xname;
}
/* 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_EMIT_BSS
&& DECL_COMMON (decl)
#endif
&& DECL_SECTION_NAME (decl) == NULL_TREE
&& ! dont_output_data)
{
unsigned HOST_WIDE_INT size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
unsigned HOST_WIDE_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));
/* Don't continue this line--convex cc version 4.1 would lose. */
#if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_DECL_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS)
if ((unsigned HOST_WIDE_INT) DECL_ALIGN (decl) / BITS_PER_UNIT > rounded)
warning_with_decl
(decl, "requested alignment for %s is greater than implemented alignment of %d.",rounded);
#endif
asm_emit_uninitialised (decl, name, size, rounded);
return;
}
/* 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);
/* Remove this variable from the pending weak list so that
we do not emit multiple .weak directives for it. */
remove_from_pending_weak_list
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
}
else
#endif
ASM_GLOBALIZE_LABEL (asm_out_file, name);
}
/* 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));
/* Switch to the appropriate section. */
resolve_unique_section (decl, reloc);
variable_section (decl, reloc);
/* dbxout.c needs to know this. */
if (in_text_section ())
DECL_IN_TEXT_SECTION (decl) = 1;
/* 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_low_cst (DECL_SIZE_UNIT (decl), 1));
else
/* Leave space for it. */
assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
}
}
/* 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 ATTRIBUTE_UNUSED;
{
/* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
main body of this code is only rarely exercised. To provide some
testing, on all platforms, we make sure that the ASM_OUT_FILE is
open. If it's not, we should not be calling this function. */
if (!asm_out_file)
abort ();
#ifdef ASM_OUTPUT_EXTERNAL
if (DECL_P (decl) && 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 ATTRIBUTE_UNUSED;
{
#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)
const char *name;
{
ASM_GLOBALIZE_LABEL (asm_out_file, name);
}
/* Assemble a label named NAME. */
void
assemble_label (name)
const 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;
const char *name;
{
const char *real_name;
tree id;
STRIP_NAME_ENCODING (real_name, name);
if (flag_prefix_function_name
&& ! memcmp (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];
const char *namestring;
rtx x;
#if 0
if (flag_shared_data)
data_section ();
#endif
ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
++const_labelno;
namestring = ggc_strdup (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. */
/* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
int rounded ATTRIBUTE_UNUSED
= ((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];
const 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 = ggc_strdup (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. */
struct assemble_real_args
{
REAL_VALUE_TYPE *d;
enum machine_mode mode;
};
static void
assemble_real_1 (p)
PTR p;
{
struct assemble_real_args *args = (struct assemble_real_args *) p;
REAL_VALUE_TYPE *d = args->d;
enum machine_mode mode = args->mode;
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 ();
}
}
void
assemble_real (d, mode)
REAL_VALUE_TYPE d;
enum machine_mode mode;
{
struct assemble_real_args args;
args.d = &d;
args.mode = mode;
if (do_float_handler (assemble_real_1, (PTR) &args))
return;
internal_error ("floating point trap outputting a constant");
}
/* Here we combine duplicate floating constants to make
CONST_DOUBLE rtx's, and force those out to memory when necessary. */
/* 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 (width < HOST_BITS_PER_WIDE_INT
&& (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. */
if (cfun != 0)
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. */
r = gen_rtx_CONST_DOUBLE (mode, const0_rtx, i0, i1);
/* Don't touch const_double_chain if not inside any function. */
if (current_function_decl != 0)
{
CONST_DOUBLE_CHAIN (r) = const_double_chain;
const_double_chain = r;
}
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. */
if (cfun != 0)
for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r))
if (! memcmp ((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. */
r = rtx_alloc (CONST_DOUBLE);
PUT_MODE (r, mode);
memcpy ((char *) &CONST_DOUBLE_LOW (r), (char *) &u, sizeof u);
/* If we aren't inside a function, don't put r on the
const_double_chain. */
if (current_function_decl != 0)
{
CONST_DOUBLE_CHAIN (r) = const_double_chain;
const_double_chain = r;
}
else
CONST_DOUBLE_CHAIN (r) = NULL_RTX;
/* 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;
enum machine_mode mode;
int i;
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;
for (i = 0; i <= 2; i++)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
{
r = const_tiny_rtx[i][(int) mode];
CONST_DOUBLE_CHAIN (r) = 0;
CONST_DOUBLE_MEM (r) = cc0_rtx;
}
}
/* 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
&& host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
{
offset += int_byte_position (TREE_OPERAND (target, 1));
target = TREE_OPERAND (target, 0);
}
else if (TREE_CODE (target) == ARRAY_REF
|| TREE_CODE (target) == ARRAY_RANGE_REF)
{
offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
* tree_low_cst (TREE_OPERAND (target, 1), 0));
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;
}
enum kind { RTX_DOUBLE, RTX_INT };
struct rtx_const
{
ENUM_BITFIELD(kind) kind : 16;
ENUM_BITFIELD(machine_mode) mode : 16;
union {
union real_extract du;
struct addr_const addr;
struct {HOST_WIDE_INT high, low;} di;
} un;
};
/* 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;
const char *label;
rtx rtl;
/* Make sure the data is reasonably aligned. */
union
{
unsigned char contents[1];
#ifdef HAVE_LONG_DOUBLE
long double d;
#else
double d;
#endif
} u;
};
#define HASHBITS 30
#define MAX_HASH_TABLE 1009
static struct constant_descriptor *const_hash_table[MAX_HASH_TABLE];
#define STRHASH(x) ((hashval_t)((long)(x) >> 3))
struct deferred_string
{
const char *label;
tree exp;
int labelno;
};
static htab_t const_str_htab;
/* Mark a const_hash_table descriptor for GC. */
static void
mark_const_hash_entry (ptr)
void *ptr;
{
struct constant_descriptor *desc = * (struct constant_descriptor **) ptr;
while (desc)
{
ggc_mark_rtx (desc->rtl);
desc = desc->next;
}
}
/* Mark the hash-table element X (which is really a pointer to an
struct deferred_string *). */
static int
mark_const_str_htab_1 (x, data)
void **x;
void *data ATTRIBUTE_UNUSED;
{
ggc_mark_tree (((struct deferred_string *) *x)->exp);
return 1;
}
/* Mark a const_str_htab for GC. */
static void
mark_const_str_htab (htab)
void *htab;
{
htab_traverse (*((htab_t *) htab), mark_const_str_htab_1, NULL);
}
/* Returns a hash code for X (which is a really a
struct deferred_string *). */
static hashval_t
const_str_htab_hash (x)
const void *x;
{
return STRHASH (((const struct deferred_string *) x)->label);
}
/* Returns non-zero if the value represented by X (which is really a
struct deferred_string *) is the same as that given by Y
(which is really a char *). */
static int
const_str_htab_eq (x, y)
const void *x;
const void *y;
{
return (((const struct deferred_string *) x)->label == (const char *) y);
}
/* Delete the hash table entry dfsp. */
static void
const_str_htab_del (dfsp)
void *dfsp;
{
free (dfsp);
}
/* Compute a hash code for a constant expression. */
static int
const_hash (exp)
tree exp;
{
register const 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 (exp);
len = sizeof TREE_INT_CST (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)
{
char *tmp;
len = int_size_in_bytes (TREE_TYPE (exp));
tmp = (char *) alloca (len);
get_set_constructor_bytes (exp, (unsigned char *) tmp, len);
p = tmp;
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;
else
abort();
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:
/* A language specific constant. Just hash the code. */
return (int) code % MAX_HASH_TABLE;
}
/* 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->u.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 const unsigned char *
compare_constant_1 (exp, p)
tree exp;
const unsigned char *p;
{
register const unsigned 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 = (unsigned char *) &TREE_INT_CST (exp);
len = sizeof TREE_INT_CST (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 = (unsigned char *) &TREE_REAL_CST (exp);
len = sizeof TREE_REAL_CST (exp);
break;
case STRING_CST:
if (flag_writable_strings)
return 0;
if ((enum machine_mode) *p++ != TYPE_MODE (TREE_TYPE (exp)))
return 0;
strp = (const unsigned char *)TREE_STRING_POINTER (exp);
len = TREE_STRING_LENGTH (exp);
if (memcmp ((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));
unsigned char *tmp = (unsigned char *) alloca (len);
get_set_constructor_bytes (exp, tmp, len);
strp = (unsigned char *) tmp;
if (memcmp ((char *) &xlen, p, sizeof xlen))
return 0;
p += sizeof xlen;
break;
}
else
{
register tree link;
int length = list_length (CONSTRUCTOR_ELTS (exp));
tree type;
enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
int have_purpose = 0;
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
if (TREE_PURPOSE (link))
have_purpose = 1;
if (memcmp ((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 (memcmp ((char *) &type, p, sizeof type))
return 0;
if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
{
if (memcmp ((char *) &mode, p, sizeof mode))
return 0;
p += sizeof mode;
}
p += sizeof type;
if (memcmp ((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 (memcmp ((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 (memcmp ((char *) &zero, p, sizeof zero))
return 0;
p += sizeof zero;
}
if (TREE_PURPOSE (link)
&& TREE_CODE (TREE_PURPOSE (link)) == FIELD_DECL)
{
if (memcmp ((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 (memcmp ((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 = (unsigned char *) &value.offset;
len = sizeof value.offset;
/* Compare the offset. */
while (--len >= 0)
if (*p++ != *strp++)
return 0;
/* Compare symbol name. */
strp = (const unsigned char *) XSTR (value.base, 0);
len = strlen ((const char *) strp) + 1;
}
break;
case PLUS_EXPR:
case MINUS_EXPR:
case RANGE_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:
if (lang_expand_constant)
{
exp = (*lang_expand_constant) (exp);
return compare_constant_1 (exp, p);
}
return 0;
}
/* 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;
rtx rtl = 0;
int pad;
/* Make a struct constant_descriptor. The first three 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);
obstack_grow (&permanent_obstack, (char *) &rtl, sizeof rtl);
/* Align the descriptor for the data payload. */
pad = (offsetof (struct constant_descriptor, u)
- offsetof(struct constant_descriptor, rtl)
- sizeof(next->rtl));
if (pad > 0)
obstack_blank (&permanent_obstack, pad);
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 const unsigned 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 = (unsigned char *) &TREE_INT_CST (exp);
len = sizeof TREE_INT_CST (exp);
break;
case REAL_CST:
obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp)));
strp = (unsigned 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 = (const unsigned char *) 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));
enum machine_mode mode = TYPE_MODE (TREE_TYPE (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
of the same mode. 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);
if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
obstack_grow (&permanent_obstack, &mode, sizeof mode);
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);
switch (GET_CODE (value.base))
{
case SYMBOL_REF:
/* Record the symbol name. */
obstack_grow (&permanent_obstack, XSTR (value.base, 0),
strlen (XSTR (value.base, 0)) + 1);
break;
case LABEL_REF:
/* Record the address of the CODE_LABEL. It may not have
been emitted yet, so it's UID may be zero. But pointer
identity is good enough. */
obstack_grow (&permanent_obstack, &XEXP (value.base, 0),
sizeof (rtx));
break;
default:
abort ();
}
}
return;
case PLUS_EXPR:
case MINUS_EXPR:
case RANGE_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:
if (lang_expand_constant)
{
exp = (*lang_expand_constant) (exp);
record_constant_1 (exp);
}
return;
}
/* 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.
If DEFER is non-zero, the output of string constants can be deferred
and output only if referenced in the function after all optimizations.
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, defer)
tree exp;
int defer;
{
register int hash;
register struct constant_descriptor *desc;
struct deferred_string **defstr;
char label[256];
int reloc;
int found = 1;
int after_function = 0;
int labelno = -1;
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))
break;
if (desc == 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. */
labelno = const_labelno++;
ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
desc = record_constant (exp);
desc->next = const_hash_table[hash];
desc->label = ggc_strdup (label);
const_hash_table[hash] = desc;
/* We have a symbol name; construct the SYMBOL_REF and the MEM. */
desc->rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
gen_rtx_SYMBOL_REF (Pmode, desc->label));
set_mem_attributes (desc->rtl, exp, 1);
found = 0;
}
TREE_CST_RTL (exp) = desc->rtl;
/* 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
/* A previously-processed constant would already have section info
encoded in it. */
if (! found)
{
ENCODE_SECTION_INFO (exp);
desc->rtl = TREE_CST_RTL (exp);
desc->label = XSTR (XEXP (desc->rtl, 0), 0);
}
#endif
#ifdef CONSTANT_AFTER_FUNCTION_P
if (current_function_decl != 0
&& CONSTANT_AFTER_FUNCTION_P (exp))
after_function = 1;
#endif
if (found
&& STRING_POOL_ADDRESS_P (XEXP (desc->rtl, 0))
&& (!defer || defer_addressed_constants_flag || after_function))
{
defstr = (struct deferred_string **)
htab_find_slot_with_hash (const_str_htab, desc->label,
STRHASH (desc->label), NO_INSERT);
if (defstr)
{
/* If the string is currently deferred but we need to output it now,
remove it from deferred string hash table. */
found = 0;
labelno = (*defstr)->labelno;
STRING_POOL_ADDRESS_P (XEXP (desc->rtl, 0)) = 0;
htab_clear_slot (const_str_htab, (void **) defstr);
}
}
/* If this is the first time we've seen this particular constant,
output it (or defer its output for later). */
if (! found)
{
if (defer_addressed_constants_flag || after_function)
{
struct deferred_constant *p;
p = (struct deferred_constant *) xmalloc (sizeof (struct deferred_constant));
p->exp = copy_constant (exp);
p->reloc = reloc;
p->labelno = labelno;
if (after_function)
{
p->next = after_function_constants;
after_function_constants = p;
}
else
{
p->next = deferred_constants;
deferred_constants = p;
}
}
else
{
/* Do no output if -fsyntax-only. */
if (! flag_syntax_only)
{
if (TREE_CODE (exp) != STRING_CST
|| !defer
|| flag_writable_strings
|| (defstr = (struct deferred_string **)
htab_find_slot_with_hash (const_str_htab,
desc->label,
STRHASH (desc->label),
INSERT)) == NULL)
output_constant_def_contents (exp, reloc, labelno);
else
{
struct deferred_string *p;
p = (struct deferred_string *)
xmalloc (sizeof (struct deferred_string));
p->exp = copy_constant (exp);
p->label = desc->label;
p->labelno = labelno;
*defstr = p;
STRING_POOL_ADDRESS_P (XEXP (desc->rtl, 0)) = 1;
}
}
}
}
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
? MAX (TREE_STRING_LENGTH (exp),
int_size_in_bytes (TREE_TYPE (exp)))
: int_size_in_bytes (TREE_TYPE (exp))));
}
/* 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, *next_sym;
const char *label;
rtx constant;
enum machine_mode mode;
int labelno;
int align;
int offset;
int mark;
};
/* 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 a new function. */
void
init_varasm_status (f)
struct function *f;
{
struct varasm_status *p;
p = (struct varasm_status *) xmalloc (sizeof (struct varasm_status));
f->varasm = p;
p->x_const_rtx_hash_table
= ((struct constant_descriptor **)
xcalloc (MAX_RTX_HASH_TABLE, sizeof (struct constant_descriptor *)));
p->x_const_rtx_sym_hash_table
= ((struct pool_constant **)
xcalloc (MAX_RTX_HASH_TABLE, sizeof (struct pool_constant *)));
p->x_first_pool = p->x_last_pool = 0;
p->x_pool_offset = 0;
p->x_const_double_chain = 0;
}
/* Mark PC for GC. */
static void
mark_pool_constant (pc)
struct pool_constant *pc;
{
while (pc)
{
ggc_mark (pc);
ggc_mark_rtx (pc->constant);
pc = pc->next;
}
}
/* Mark P for GC. */
void
mark_varasm_status (p)
struct varasm_status *p;
{
if (p == NULL)
return;
mark_pool_constant (p->x_first_pool);
ggc_mark_rtx (p->x_const_double_chain);
}
/* Clear out all parts of the state in F that can safely be discarded
after the function has been compiled, to let garbage collection
reclaim the memory. */
void
free_varasm_status (f)
struct function *f;
{
struct varasm_status *p;
int i;
p = f->varasm;
/* Clear out the hash tables. */
for (i = 0; i < MAX_RTX_HASH_TABLE; ++i)
{
struct constant_descriptor* cd;
cd = p->x_const_rtx_hash_table[i];
while (cd) {
struct constant_descriptor* next = cd->next;
free (cd);
cd = next;
}
}
free (p->x_const_rtx_hash_table);
free (p->x_const_rtx_sym_hash_table);
free (p);
f->varasm = NULL;
}
/* 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. */
memset (value, 0, sizeof (struct rtx_const));
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);
memcpy ((char *) &value->un.du,
(char *) &CONST_DOUBLE_LOW (x), 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 && GET_CODE (XEXP (x, 1)) == CONST_INT)
{
value->un.addr.base = XEXP (x, 0);
value->un.addr.offset = INTVAL (XEXP (x, 1));
}
else if (GET_CODE (x) == MINUS && GET_CODE (XEXP (x, 1)) == CONST_INT)
{
value->un.addr.base = XEXP (x, 0);
value->un.addr.offset = - INTVAL (XEXP (x, 1));
}
else
{
value->un.addr.base = x;
value->un.addr.offset = 0;
}
break;
default:
abort ();
}
if (value->kind == RTX_INT && value->un.addr.base != 0)
switch (GET_CODE (value->un.addr.base))
{
case SYMBOL_REF:
/* Use the string's address, not the SYMBOL_REF's address,
for the sake of addresses of library routines. */
value->un.addr.base = (rtx) XSTR (value->un.addr.base, 0);
break;
case LABEL_REF:
/* 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->u.contents;
register int *strp;
register int len;
struct rtx_const value;
decode_rtx_const (mode, x, &value);
strp = (int *) &value;
len = sizeof value / sizeof (int);
/* Compare constant contents. */
while (--len >= 0)
if (*p++ != *strp++)
return 0;
return 1;
}
/* Construct a constant descriptor for the rtl-expression X.
It is up to the caller to enter the descriptor in the hash table. */
static struct constant_descriptor *
record_constant_rtx (mode, x)
enum machine_mode mode;
rtx x;
{
struct constant_descriptor *ptr;
ptr = ((struct constant_descriptor *)
xcalloc (1, (offsetof (struct constant_descriptor, u)
+ sizeof (struct rtx_const))));
decode_rtx_const (mode, x, (struct rtx_const *) ptr->u.contents);
return ptr;
}
/* Given a constant rtx X, make (or find) a memory constant for its value
and return a MEM rtx to refer to it in memory. */
rtx
force_const_mem (mode, x)
enum machine_mode mode;
rtx x;
{
register int hash;
register struct constant_descriptor *desc;
char label[256];
const char *found = 0;
rtx def;
/* If we want this CONST_DOUBLE in the same mode as it is in memory
(this will always be true for floating CONST_DOUBLEs that have been
placed in memory, but not for VOIDmode (integer) CONST_DOUBLEs),
use the previous copy. Otherwise, make a new one. Note that in
the unlikely event that this same CONST_DOUBLE is used in two different
modes in an alternating fashion, we will allocate a lot of different
memory locations, but this should be extremely rare. */
if (GET_CODE (x) == CONST_DOUBLE
&& GET_CODE (CONST_DOUBLE_MEM (x)) == MEM
&& GET_MODE (CONST_DOUBLE_MEM (x)) == mode)
return CONST_DOUBLE_MEM (x);
/* Compute hash code of X. Search the descriptors for that hash code
to see if any of them describes X. If yes, the descriptor records
the label number already assigned. */
hash = const_hash_rtx (mode, x);
for (desc = const_rtx_hash_table[hash]; desc; desc = desc->next)
if (compare_constant_rtx (mode, x, desc))
{
found = desc->label;
break;
}
if (found == 0)
{
register struct pool_constant *pool;
int align;
/* No constant equal to X is known to have been output.
Make a constant descriptor to enter X in the hash table.
Assign the label number and record it in the descriptor for
future calls to this function to find. */
desc = record_constant_rtx (mode, x);
desc->next = const_rtx_hash_table[hash];
const_rtx_hash_table[hash] = desc;
/* Align the location counter as required by EXP's data type. */
align = (mode == VOIDmode) ? UNITS_PER_WORD : GET_MODE_SIZE (mode);
if (align > BIGGEST_ALIGNMENT / BITS_PER_UNIT)
align = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
#ifdef CONSTANT_ALIGNMENT
align = CONSTANT_ALIGNMENT (make_tree (type_for_mode (mode, 0), x),
align * BITS_PER_UNIT) / BITS_PER_UNIT;
#endif
pool_offset += align - 1;
pool_offset &= ~ (align - 1);
if (GET_CODE (x) == LABEL_REF)
LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
/* Allocate a pool constant descriptor, fill it in, and chain it in. */
pool = (struct pool_constant *) ggc_alloc (sizeof (struct pool_constant));
pool->desc = desc;
pool->constant = x;
pool->mode = mode;
pool->labelno = const_labelno;
pool->align = align;
pool->offset = pool_offset;
pool->mark = 1;
pool->next = 0;
if (last_pool == 0)
first_pool = pool;
else
last_pool->next = pool;
last_pool = pool;
pool_offset += GET_MODE_SIZE (mode);
/* Create a string containing the label name, in LABEL. */
ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
++const_labelno;
desc->label = found = ggc_strdup (label);
/* Add label to symbol hash table. */
hash = SYMHASH (found);
pool->label = found;
pool->next_sym = const_rtx_sym_hash_table[hash];
const_rtx_sym_hash_table[hash] = pool;
}
/* We have a symbol name; construct the SYMBOL_REF and the MEM. */
def = gen_rtx_MEM (mode, gen_rtx_SYMBOL_REF (Pmode, found));
set_mem_attributes (def, type_for_mode (mode, 0), 1);
RTX_UNCHANGING_P (def) = 1;
/* Mark the symbol_ref as belonging to this constants pool. */
CONSTANT_POOL_ADDRESS_P (XEXP (def, 0)) = 1;
current_function_uses_const_pool = 1;
if (GET_CODE (x) == CONST_DOUBLE)
{
if (CONST_DOUBLE_MEM (x) == cc0_rtx)
{
CONST_DOUBLE_CHAIN (x) = const_double_chain;
const_double_chain = x;
}
CONST_DOUBLE_MEM (x) = def;
}
return def;
}
/* Given a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true, return a pointer to
the corresponding pool_constant structure. */
static struct pool_constant *
find_pool_constant (f, addr)
struct function *f;
rtx addr;
{
struct pool_constant *pool;
const char *label = XSTR (addr, 0);
for (pool = f->varasm->x_const_rtx_sym_hash_table[SYMHASH (label)]; pool;
pool = pool->next_sym)
if (pool->label == label)
return pool;
abort ();
}
/* Given a constant pool SYMBOL_REF, return the corresponding constant. */
rtx
get_pool_constant (addr)
rtx addr;
{
return (find_pool_constant (cfun, addr))->constant;
}
/* Likewise, but for the constant pool of a specific function. */
rtx
get_pool_constant_for_function (f, addr)
struct function *f;
rtx addr;
{
return (find_pool_constant (f, addr))->constant;
}
/* Similar, return the mode. */
enum machine_mode
get_pool_mode (addr)
rtx addr;
{
return (find_pool_constant (cfun, addr))->mode;
}
enum machine_mode
get_pool_mode_for_function (f, addr)
struct function *f;
rtx addr;
{
return (find_pool_constant (f, addr))->mode;
}
/* Similar, return the offset in the constant pool. */
int
get_pool_offset (addr)
rtx addr;
{
return (find_pool_constant (cfun, addr))->offset;
}
/* Return the size of the constant pool. */
int
get_pool_size ()
{
return pool_offset;
}
/* Write all the constants in the constant pool. */
void
output_constant_pool (fnname, fndecl)
const char *fnname ATTRIBUTE_UNUSED;
tree fndecl ATTRIBUTE_UNUSED;
{
struct pool_constant *pool;
rtx x;
union real_extract u;
/* It is possible for gcc to call force_const_mem and then to later
discard the instructions which refer to the constant. In such a
case we do not need to output the constant. */
mark_constant_pool ();
#ifdef ASM_OUTPUT_POOL_PROLOGUE
ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool_offset);
#endif
for (pool = first_pool; pool; pool = pool->next)
{
rtx tmp;
x = pool->constant;
if (! pool->mark)
continue;
/* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
whose CODE_LABEL has been deleted. This can occur if a jump table
is eliminated by optimization. If so, write a constant of zero
instead. Note that this can also happen by turning the
CODE_LABEL into a NOTE. */
/* ??? This seems completely and utterly wrong. Certainly it's
not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
functioning even with INSN_DELETED_P and friends. */
tmp = x;
switch (GET_CODE (x))
{
case CONST:
if (GET_CODE (XEXP (x, 0)) != PLUS
|| GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
break;
tmp = XEXP (XEXP (x, 0), 0);
/* FALLTHRU */
case LABEL_REF:
tmp = XEXP (x, 0);
if (INSN_DELETED_P (tmp)
|| (GET_CODE (tmp) == NOTE
&& NOTE_LINE_NUMBER (tmp) == NOTE_INSN_DELETED))
{
abort ();
x = const0_rtx;
}
break;
default:
break;
}
/* First switch to correct section. */
#ifdef SELECT_RTX_SECTION
SELECT_RTX_SECTION (pool->mode, x);
#else
readonly_data_section ();
#endif
#ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, pool->mode,
pool->align, pool->labelno, done);
#endif
if (pool->align > 1)
ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (pool->align));
/* Output the label. */
ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LC", pool->labelno);
/* Output the value of the constant itself. */
switch (GET_MODE_CLASS (pool->mode))
{
case MODE_FLOAT:
if (GET_CODE (x) != CONST_DOUBLE)
abort ();
memcpy ((char *) &u, (char *) &CONST_DOUBLE_LOW (x), sizeof u);
assemble_real (u.d, pool->mode);
break;
case MODE_INT:
case MODE_PARTIAL_INT:
assemble_integer (x, GET_MODE_SIZE (pool->mode), 1);
break;
default:
abort ();
}
#ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
done: ;
#endif
}
#ifdef ASM_OUTPUT_POOL_EPILOGUE
ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool_offset);
#endif
/* Done with this pool. */
first_pool = last_pool = 0;
}
/* Look through the instructions for this function, and mark all the
entries in the constant pool which are actually being used.
Emit used deferred strings. */
static void
mark_constant_pool ()
{
register rtx insn;
struct pool_constant *pool;
if (first_pool == 0 && htab_elements (const_str_htab) == 0)
return;
for (pool = first_pool; pool; pool = pool->next)
pool->mark = 0;
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
if (INSN_P (insn))
mark_constants (PATTERN (insn));
for (insn = current_function_epilogue_delay_list;
insn;
insn = XEXP (insn, 1))
if (INSN_P (insn))
mark_constants (PATTERN (insn));
}
/* Look through appropriate parts of X, marking all entries in the
constant pool which are actually being used. Entries that are only
referenced by other constants are also marked as used. Emit
deferred strings that are used. */
static void
mark_constants (x)
rtx x;
{
register int i;
register const char *format_ptr;
if (x == 0)
return;
if (GET_CODE (x) == SYMBOL_REF)
{
mark_constant (&x, NULL);
return;
}
/* Never search inside a CONST_DOUBLE, because CONST_DOUBLE_MEM may be
a MEM, but does not constitute a use of that MEM. */
else if (GET_CODE (x) == CONST_DOUBLE)
return;
/* Insns may appear inside a SEQUENCE. Only check the patterns of
insns, not any notes that may be attached. We don't want to mark
a constant just because it happens to appear in a REG_EQUIV note. */
if (INSN_P (x))
{
mark_constants (PATTERN (x));
return;
}
format_ptr = GET_RTX_FORMAT (GET_CODE (x));
for (i = 0; i < GET_RTX_LENGTH (GET_CODE (x)); i++)
{
switch (*format_ptr++)
{
case 'e':
mark_constants (XEXP (x, i));
break;
case 'E':
if (XVEC (x, i) != 0)
{
register int j;
for (j = 0; j < XVECLEN (x, i); j++)
mark_constants (XVECEXP (x, i, j));
}
break;
case 'S':
case 's':
case '0':
case 'i':
case 'w':
case 'n':
case 'u':
break;
default:
abort ();
}
}
}
/* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
to as used. Emit referenced deferred strings. This function can
be used with for_each_rtx () to mark all SYMBOL_REFs in an rtx. */
static int
mark_constant (current_rtx, data)
rtx *current_rtx;
void *data ATTRIBUTE_UNUSED;
{
rtx x = *current_rtx;
if (x == NULL_RTX)
return 0;
else if (GET_CODE(x) == CONST_DOUBLE)
/* Never search inside a CONST_DOUBLE because CONST_DOUBLE_MEM may
be a MEM but does not constitute a use of that MEM. */
return -1;
else if (GET_CODE (x) == SYMBOL_REF)
{
if (CONSTANT_POOL_ADDRESS_P (x))
{
struct pool_constant *pool = find_pool_constant (cfun, x);
if (pool->mark == 0) {
pool->mark = 1;
for_each_rtx (&(pool->constant), &mark_constant, NULL);
}
else
return -1;
}
else if (STRING_POOL_ADDRESS_P (x))
{
struct deferred_string **defstr;
defstr = (struct deferred_string **)
htab_find_slot_with_hash (const_str_htab, XSTR (x, 0),
STRHASH (XSTR (x, 0)), NO_INSERT);
if (defstr)
{
struct deferred_string *p = *defstr;
STRING_POOL_ADDRESS_P (x) = 0;
output_constant_def_contents (p->exp, 0, p->labelno);
htab_clear_slot (const_str_htab, (void **) defstr);
}
}
}
return 0;
}
/* Find all the constants whose addresses are referenced inside of EXP,
and make sure assembler code with a label has been output for each one.
Indicate whether an ADDR_EXPR has been encountered. */
static int
output_addressed_constants (exp)
tree exp;
{
int reloc = 0;
/* Give the front-end a chance to convert VALUE to something that
looks more like a constant to the back-end. */
if (lang_expand_constant)
exp = (*lang_expand_constant) (exp);
switch (TREE_CODE (exp))
{
case ADDR_EXPR:
{
register tree constant = TREE_OPERAND (exp, 0);
while (TREE_CODE (constant) == COMPONENT_REF)
{
constant = TREE_OPERAND (constant, 0);
}
if (TREE_CODE_CLASS (TREE_CODE (constant)) == 'c'
|| TREE_CODE (constant) == CONSTRUCTOR)
/* No need to do anything here
for addresses of variables or functions. */
output_constant_def (constant, 0);
}
reloc = 1;
break;
case PLUS_EXPR:
case MINUS_EXPR:
reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
reloc |= output_addressed_constants (TREE_OPERAND (exp, 1));
break;
case NOP_EXPR:
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
break;
case CONSTRUCTOR:
{
register tree link;
for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
if (TREE_VALUE (link) != 0)
reloc |= output_addressed_constants (TREE_VALUE (link));
}
break;
default:
break;
}
return reloc;
}
/* Return nonzero if VALUE is a valid constant-valued expression
for use in initializing a static variable; one that can be an
element of a "constant" initializer.
Return null_pointer_node if the value is absolute;
if it is relocatable, return the variable that determines the relocation.
We assume that VALUE has been folded as much as possible;
therefore, we do not need to check for such things as
arithmetic-combinations of integers. */
tree
initializer_constant_valid_p (value, endtype)
tree value;
tree endtype;
{
/* Give the front-end a chance to convert VALUE to something that
looks more like a constant to the back-end. */
if (lang_expand_constant)
value = (*lang_expand_constant) (value);
switch (TREE_CODE (value))
{
case CONSTRUCTOR:
if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
|| TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
&& TREE_CONSTANT (value)
&& CONSTRUCTOR_ELTS (value))
return
initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value)),
endtype);
return TREE_STATIC (value) ? null_pointer_node : 0;
case INTEGER_CST:
case REAL_CST:
case STRING_CST:
case COMPLEX_CST:
return null_pointer_node;
case ADDR_EXPR:
return staticp (TREE_OPERAND (value, 0)) ? TREE_OPERAND (value, 0) : 0;
case NON_LVALUE_EXPR:
return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
case CONVERT_EXPR:
case NOP_EXPR:
/* Allow conversions between pointer types. */
if (POINTER_TYPE_P (TREE_TYPE (value))
&& POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
/* Allow conversions between real types. */
if (FLOAT_TYPE_P (TREE_TYPE (value))
&& FLOAT_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
/* Allow length-preserving conversions between integer types. */
if (INTEGRAL_TYPE_P (TREE_TYPE (value))
&& INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0)))
&& (TYPE_PRECISION (TREE_TYPE (value))
== TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
/* Allow conversions between other integer types only if
explicit value. */
if (INTEGRAL_TYPE_P (TREE_TYPE (value))
&& INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
{
tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0),
endtype);
if (inner == null_pointer_node)
return null_pointer_node;
break;
}
/* Allow (int) &foo provided int is as wide as a pointer. */
if (INTEGRAL_TYPE_P (TREE_TYPE (value))
&& POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0)))
&& (TYPE_PRECISION (TREE_TYPE (value))
>= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
return initializer_constant_valid_p (TREE_OPERAND (value, 0),
endtype);
/* Likewise conversions from int to pointers, but also allow
conversions from 0. */
if (POINTER_TYPE_P (TREE_TYPE (value))
&& INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
{
if (integer_zerop (TREE_OPERAND (value, 0)))
return null_pointer_node;
else if (TYPE_PRECISION (TREE_TYPE (value))
<= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))
return initializer_constant_valid_p (TREE_OPERAND (value, 0),
endtype);
}
/* Allow conversions to union types if the value inside is okay. */
if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE)
return initializer_constant_valid_p (TREE_OPERAND (value, 0),
endtype);
break;
case PLUS_EXPR:
if (! INTEGRAL_TYPE_P (endtype)
|| TYPE_PRECISION (endtype) >= POINTER_SIZE)
{
tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
endtype);
tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
endtype);
/* If either term is absolute, use the other terms relocation. */
if (valid0 == null_pointer_node)
return valid1;
if (valid1 == null_pointer_node)
return valid0;
}
break;
case MINUS_EXPR:
if (! INTEGRAL_TYPE_P (endtype)
|| TYPE_PRECISION (endtype) >= POINTER_SIZE)
{
tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
endtype);
tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
endtype);
/* Win if second argument is absolute. */
if (valid1 == null_pointer_node)
return valid0;
/* Win if both arguments have the same relocation.
Then the value is absolute. */
if (valid0 == valid1 && valid0 != 0)
return null_pointer_node;
/* Since GCC guarantees that string constants are unique in the
generated code, a subtraction between two copies of the same
constant string is absolute. */
if (valid0 && TREE_CODE (valid0) == STRING_CST &&
valid1 && TREE_CODE (valid1) == STRING_CST &&
TREE_STRING_POINTER (valid0) == TREE_STRING_POINTER (valid1))
return null_pointer_node;
}
/* Support differences between labels. */
if (INTEGRAL_TYPE_P (endtype))
{
tree op0, op1;
op0 = TREE_OPERAND (value, 0);
op1 = TREE_OPERAND (value, 1);
STRIP_NOPS (op0);
STRIP_NOPS (op1);
if (TREE_CODE (op0) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (op0, 0)) == LABEL_DECL
&& TREE_CODE (op1) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (op1, 0)) == LABEL_DECL)
return null_pointer_node;
}
break;
default:
break;
}
return 0;
}
/* Output assembler code for constant EXP to FILE, with no label.
This includes the pseudo-op such as ".int" or ".byte", and a newline.
Assumes output_addressed_constants has been done on EXP already.
Generate exactly SIZE bytes of assembler data, padding at the end
with zeros if necessary. SIZE must always be specified.
SIZE is important for structure constructors,
since trailing members may have been omitted from the constructor.
It is also important for initialization of arrays from string constants
since the full length of the string constant might not be wanted.
It is also needed for initialization of unions, where the initializer's
type is just one member, and that may not be as long as the union.
There a case in which we would fail to output exactly SIZE bytes:
for a structure constructor that wants to produce more than SIZE bytes.
But such constructors will never be generated for any possible input. */
void
output_constant (exp, size)
register tree exp;
register int size;
{
register enum tree_code code = TREE_CODE (TREE_TYPE (exp));
/* Some front-ends use constants other than the standard
language-indepdent varieties, but which may still be output
directly. Give the front-end a chance to convert EXP to a
language-independent representation. */
if (lang_expand_constant)
{
exp = (*lang_expand_constant) (exp);
code = TREE_CODE (TREE_TYPE (exp));
}
if (size == 0 || flag_syntax_only)
return;
/* Eliminate the NON_LVALUE_EXPR_EXPR that makes a cast not be an lvalue.
That way we get the constant (we hope) inside it. Also, strip off any
NOP_EXPR that converts between two record, union, array, or set types
or a CONVERT_EXPR that converts to a union TYPE. */
while ((TREE_CODE (exp) == NOP_EXPR
&& (TREE_TYPE (exp) == TREE_TYPE (TREE_OPERAND (exp, 0))
|| AGGREGATE_TYPE_P (TREE_TYPE (exp))))
|| (TREE_CODE (exp) == CONVERT_EXPR
&& code == UNION_TYPE)
|| TREE_CODE (exp) == NON_LVALUE_EXPR)
{
exp = TREE_OPERAND (exp, 0);
code = TREE_CODE (TREE_TYPE (exp));
}
/* Allow a constructor with no elements for any data type.
This means to fill the space with zeros. */
if (TREE_CODE (exp) == CONSTRUCTOR && CONSTRUCTOR_ELTS (exp) == 0)
{
assemble_zeros (size);
return;
}
switch (code)
{
case CHAR_TYPE:
case BOOLEAN_TYPE:
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case POINTER_TYPE:
case REFERENCE_TYPE:
/* ??? What about (int)((float)(int)&foo + 4) */
while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
|| TREE_CODE (exp) == NON_LVALUE_EXPR)
exp = TREE_OPERAND (exp, 0);
if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
EXPAND_INITIALIZER),
size, 0))
error ("initializer for integer value is too complicated");
size = 0;
break;
case REAL_TYPE:
if (TREE_CODE (exp) != REAL_CST)
error ("initializer for floating value is not a floating constant");
assemble_real (TREE_REAL_CST (exp),
mode_for_size (size * BITS_PER_UNIT, MODE_FLOAT, 0));
size = 0;
break;
case COMPLEX_TYPE:
output_constant (TREE_REALPART (exp), size / 2);
output_constant (TREE_IMAGPART (exp), size / 2);
size -= (size / 2) * 2;
break;
case ARRAY_TYPE:
if (TREE_CODE (exp) == CONSTRUCTOR)
{
output_constructor (exp, size);
return;
}
else if (TREE_CODE (exp) == STRING_CST)
{
int excess = 0;
if (size > TREE_STRING_LENGTH (exp))
{
excess = size - TREE_STRING_LENGTH (exp);
size = TREE_STRING_LENGTH (exp);
}
assemble_string (TREE_STRING_POINTER (exp), size);
size = excess;
}
else
abort ();
break;
case RECORD_TYPE:
case UNION_TYPE:
if (TREE_CODE (exp) == CONSTRUCTOR)
output_constructor (exp, size);
else
abort ();
return;
case SET_TYPE:
if (TREE_CODE (exp) == INTEGER_CST)
assemble_integer (expand_expr (exp, NULL_RTX,
VOIDmode, EXPAND_INITIALIZER),
size, 1);
else if (TREE_CODE (exp) == CONSTRUCTOR)
{
unsigned char *buffer = (unsigned char *) alloca (size);
if (get_set_constructor_bytes (exp, buffer, size))
abort ();
assemble_string ((char *) buffer, size);
}
else
error ("unknown set constructor type");
return;
default:
break; /* ??? */
}
if (size > 0)
assemble_zeros (size);
}
/* Subroutine of output_constructor, used for computing the size of
arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
type with an unspecified upper bound. */
static unsigned HOST_WIDE_INT
array_size_for_constructor (val)
tree val;
{
tree max_index, i;
max_index = NULL_TREE;
for (i = CONSTRUCTOR_ELTS (val); i ; i = TREE_CHAIN (i))
{
tree index = TREE_PURPOSE (i);
if (TREE_CODE (index) == RANGE_EXPR)
index = TREE_OPERAND (index, 1);
if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
max_index = index;
}
if (max_index == NULL_TREE)
return 0;
/* Compute the total number of array elements. */
i = size_binop (MINUS_EXPR, convert (sizetype, max_index),
convert (sizetype,
TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)))));
i = size_binop (PLUS_EXPR, i, convert (sizetype, integer_one_node));
/* Multiply by the array element unit size to find number of bytes. */
i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
return tree_low_cst (i, 1);
}
/* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
Generate at least SIZE bytes, padding if necessary. */
static void
output_constructor (exp, size)
tree exp;
int size;
{
tree type = TREE_TYPE (exp);
register tree link, field = 0;
tree min_index = 0;
/* Number of bytes output or skipped so far.
In other words, current position within the constructor. */
HOST_WIDE_INT total_bytes = 0;
/* Non-zero means BYTE contains part of a byte, to be output. */
int byte_buffer_in_use = 0;
register int byte = 0;
if (HOST_BITS_PER_WIDE_INT < BITS_PER_UNIT)
abort ();
if (TREE_CODE (type) == RECORD_TYPE)
field = TYPE_FIELDS (type);
if (TREE_CODE (type) == ARRAY_TYPE
&& TYPE_DOMAIN (type) != 0)
min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
/* As LINK goes through the elements of the constant,
FIELD goes through the structure fields, if the constant is a structure.
if the constant is a union, then we override this,
by getting the field from the TREE_LIST element.
But the constant could also be an array. Then FIELD is zero.
There is always a maximum of one element in the chain LINK for unions
(even if the initializer in a source program incorrectly contains
more one). */
for (link = CONSTRUCTOR_ELTS (exp);
link;
link = TREE_CHAIN (link),
field = field ? TREE_CHAIN (field) : 0)
{
tree val = TREE_VALUE (link);
tree index = 0;
/* The element in a union constructor specifies the proper field
or index. */
if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
|| TREE_CODE (type) == QUAL_UNION_TYPE)
&& TREE_PURPOSE (link) != 0)
field = TREE_PURPOSE (link);
else if (TREE_CODE (type) == ARRAY_TYPE)
index = TREE_PURPOSE (link);
/* Eliminate the marker that makes a cast not be an lvalue. */
if (val != 0)
STRIP_NOPS (val);
if (index && TREE_CODE (index) == RANGE_EXPR)
{
unsigned HOST_WIDE_INT fieldsize
= int_size_in_bytes (TREE_TYPE (type));
HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
HOST_WIDE_INT index;
for (index = lo_index; index <= hi_index; index++)
{
/* Output the element's initial value. */
if (val == 0)
assemble_zeros (fieldsize);
else
output_constant (val, fieldsize);
/* Count its size. */
total_bytes += fieldsize;
}
}
else if (field == 0 || !DECL_BIT_FIELD (field))
{
/* An element that is not a bit-field. */
unsigned HOST_WIDE_INT fieldsize;
/* Since this structure is static,
we know the positions are constant. */
HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
if (index != 0)
pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
* (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
/* Output any buffered-up bit-fields preceding this element. */
if (byte_buffer_in_use)
{
ASM_OUTPUT_BYTE (asm_out_file, byte);
total_bytes++;
byte_buffer_in_use = 0;
}
/* Advance to offset of this element.
Note no alignment needed in an array, since that is guaranteed
if each element has the proper size. */
if ((field != 0 || index != 0) && pos != total_bytes)
{
assemble_zeros (pos - total_bytes);
total_bytes = pos;
}
else if (field != 0 && DECL_PACKED (field))
/* Some assemblers automaticallly align a datum according to its
size if no align directive is specified. The datum, however,
may be declared with 'packed' attribute, so we have to disable
such a feature. */
ASM_OUTPUT_ALIGN (asm_out_file, 0);
/* Determine size this element should occupy. */
if (field)
{
fieldsize = 0;
/* If this is an array with an unspecified upper bound,
the initializer determines the size. */
/* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
but we cannot do this until the deprecated support for
initializing zero-length array members is removed. */
if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
&& TYPE_DOMAIN (TREE_TYPE (field))
&& ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
{
fieldsize = array_size_for_constructor (val);
/* Given a non-empty initialization, this field had
better be last. */
if (fieldsize != 0 && TREE_CHAIN (field) != NULL_TREE)
abort ();
}
else if (DECL_SIZE_UNIT (field))
{
/* ??? This can't be right. If the decl size overflows
a host integer we will silently emit no data. */
if (host_integerp (DECL_SIZE_UNIT (field), 1))
fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
}
}
else
fieldsize = int_size_in_bytes (TREE_TYPE (type));
/* Output the element's initial value. */
if (val == 0)
assemble_zeros (fieldsize);
else
output_constant (val, fieldsize);
/* Count its size. */
total_bytes += fieldsize;
}
else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
error ("invalid initial value for member `%s'",
IDENTIFIER_POINTER (DECL_NAME (field)));
else
{
/* Element that is a bit-field. */
HOST_WIDE_INT next_offset = int_bit_position (field);
HOST_WIDE_INT end_offset
= (next_offset + tree_low_cst (DECL_SIZE (field), 1));
if (val == 0)
val = integer_zero_node;
/* If this field does not start in this (or, next) byte,
skip some bytes. */
if (next_offset / BITS_PER_UNIT != total_bytes)
{
/* Output remnant of any bit field in previous bytes. */
if (byte_buffer_in_use)
{
ASM_OUTPUT_BYTE (asm_out_file, byte);
total_bytes++;
byte_buffer_in_use = 0;
}
/* If still not at proper byte, advance to there. */
if (next_offset / BITS_PER_UNIT != total_bytes)
{
assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
total_bytes = next_offset / BITS_PER_UNIT;
}
}
if (! byte_buffer_in_use)
byte = 0;
/* We must split the element into pieces that fall within
separate bytes, and combine each byte with previous or
following bit-fields. */
/* next_offset is the offset n fbits from the beginning of
the structure to the next bit of this element to be processed.
end_offset is the offset of the first bit past the end of
this element. */
while (next_offset < end_offset)
{
int this_time;
int shift;
HOST_WIDE_INT value;
HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
/* Advance from byte to byte
within this element when necessary. */
while (next_byte != total_bytes)
{
ASM_OUTPUT_BYTE (asm_out_file, byte);
total_bytes++;
byte = 0;
}
/* Number of bits we can process at once
(all part of the same byte). */
this_time = MIN (end_offset - next_offset,
BITS_PER_UNIT - next_bit);
if (BYTES_BIG_ENDIAN)
{
/* On big-endian machine, take the most significant bits
first (of the bits that are significant)
and put them into bytes from the most significant end. */
shift = end_offset - next_offset - this_time;
/* Don't try to take a bunch of bits that cross
the word boundary in the INTEGER_CST. We can
only select bits from the LOW or HIGH part
not from both. */
if (shift < HOST_BITS_PER_WIDE_INT
&& shift + this_time > HOST_BITS_PER_WIDE_INT)
{
this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
shift = HOST_BITS_PER_WIDE_INT;
}
/* Now get the bits from the appropriate constant word. */
if (shift < HOST_BITS_PER_WIDE_INT)
value = TREE_INT_CST_LOW (val);
else if (shift < 2 * HOST_BITS_PER_WIDE_INT)
{
value = TREE_INT_CST_HIGH (val);
shift -= HOST_BITS_PER_WIDE_INT;
}
else
abort ();
/* Get the result. This works only when:
1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
byte |= (((value >> shift)
& (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
<< (BITS_PER_UNIT - this_time - next_bit));
}
else
{
/* On little-endian machines,
take first the least significant bits of the value
and pack them starting at the least significant
bits of the bytes. */
shift = next_offset - int_bit_position (field);
/* Don't try to take a bunch of bits that cross
the word boundary in the INTEGER_CST. We can
only select bits from the LOW or HIGH part
not from both. */
if (shift < HOST_BITS_PER_WIDE_INT
&& shift + this_time > HOST_BITS_PER_WIDE_INT)
this_time = (HOST_BITS_PER_WIDE_INT - shift);
/* Now get the bits from the appropriate constant word. */
if (shift < HOST_BITS_PER_WIDE_INT)
value = TREE_INT_CST_LOW (val);
else if (shift < 2 * HOST_BITS_PER_WIDE_INT)
{
value = TREE_INT_CST_HIGH (val);
shift -= HOST_BITS_PER_WIDE_INT;
}
else
abort ();
/* Get the result. This works only when:
1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
byte |= (((value >> shift)
& (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
<< next_bit);
}
next_offset += this_time;
byte_buffer_in_use = 1;
}
}
}
if (byte_buffer_in_use)
{
ASM_OUTPUT_BYTE (asm_out_file, byte);
total_bytes++;
}
if (total_bytes < size)
assemble_zeros (size - total_bytes);
}
#ifdef HANDLE_PRAGMA_WEAK
/* Add function NAME to the weak symbols list. VALUE is a weak alias
associatd with NAME. */
int
add_weak (name, value)
const char *name;
const char *value;
{
struct weak_syms *weak;
weak = (struct weak_syms *) permalloc (sizeof (struct weak_syms));
if (weak == NULL)
return 0;
weak->next = weak_decls;
weak->name = name;
weak->value = value;
weak_decls = weak;
return 1;
}
#endif /* HANDLE_PRAGMA_WEAK */
/* Declare DECL to be a weak symbol. */
void
declare_weak (decl)
tree decl;
{
if (! TREE_PUBLIC (decl))
error_with_decl (decl, "weak declaration of `%s' must be public");
else if (TREE_ASM_WRITTEN (decl))
error_with_decl (decl, "weak declaration of `%s' must precede definition");
else if (SUPPORTS_WEAK)
DECL_WEAK (decl) = 1;
#ifdef HANDLE_PRAGMA_WEAK
add_weak (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), NULL);
#endif
}
/* Emit any pending weak declarations. */
#ifdef HANDLE_PRAGMA_WEAK
struct weak_syms * weak_decls;
#endif
void
weak_finish ()
{
#ifdef HANDLE_PRAGMA_WEAK
if (HANDLE_PRAGMA_WEAK)
{
struct weak_syms *t;
for (t = weak_decls; t; t = t->next)
{
if (t->name)
ASM_OUTPUT_WEAK_ALIAS (asm_out_file, t->name, t->value);
}
}
#endif
}
/* Remove NAME from the pending list of weak symbols. This prevents
the compiler from emitting multiple .weak directives which confuses
some assemblers. */
#ifdef ASM_WEAKEN_LABEL
static void
remove_from_pending_weak_list (name)
const char *name ATTRIBUTE_UNUSED;
{
#ifdef HANDLE_PRAGMA_WEAK
if (HANDLE_PRAGMA_WEAK)
{
struct weak_syms *t;
for (t = weak_decls; t; t = t->next)
{
if (t->name && strcmp (name, t->name) == 0)
t->name = NULL;
}
}
#endif
}
#endif
void
assemble_alias (decl, target)
tree decl, target ATTRIBUTE_UNUSED;
{
const char *name;
/* We must force creation of DECL_RTL for debug info generation, even though
we don't use it here. */
make_decl_rtl (decl, NULL);
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
#ifdef ASM_OUTPUT_DEF
/* Make name accessible from other files, if appropriate. */
if (TREE_PUBLIC (decl))
{
#ifdef ASM_WEAKEN_LABEL
if (DECL_WEAK (decl))
{
ASM_WEAKEN_LABEL (asm_out_file, name);
/* Remove this function from the pending weak list so that
we do not emit multiple .weak directives for it. */
remove_from_pending_weak_list
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
}
else
#endif
ASM_GLOBALIZE_LABEL (asm_out_file, name);
}
#ifdef ASM_OUTPUT_DEF_FROM_DECLS
ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
#else
ASM_OUTPUT_DEF (asm_out_file, name, IDENTIFIER_POINTER (target));
#endif
TREE_ASM_WRITTEN (decl) = 1;
#else
#ifdef ASM_OUTPUT_WEAK_ALIAS
if (! DECL_WEAK (decl))
warning ("only weak aliases are supported in this configuration");
ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
TREE_ASM_WRITTEN (decl) = 1;
#else
warning ("alias definitions not supported in this configuration; ignored");
#endif
#endif
}
/* Returns 1 if the target configuration supports defining public symbols
so that one of them will be chosen at link time instead of generating a
multiply-defined symbol error, whether through the use of weak symbols or
a target-specific mechanism for having duplicates discarded. */
int
supports_one_only ()
{
if (SUPPORTS_ONE_ONLY)
return 1;
return SUPPORTS_WEAK;
}
/* Set up DECL as a public symbol that can be defined in multiple
translation units without generating a linker error. */
void
make_decl_one_only (decl)
tree decl;
{
if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
abort ();
TREE_PUBLIC (decl) = 1;
if (TREE_CODE (decl) == VAR_DECL
&& (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
DECL_COMMON (decl) = 1;
else if (SUPPORTS_ONE_ONLY)
{
#ifdef MAKE_DECL_ONE_ONLY
MAKE_DECL_ONE_ONLY (decl);
#endif
DECL_ONE_ONLY (decl) = 1;
}
else if (SUPPORTS_WEAK)
DECL_WEAK (decl) = 1;
else
abort ();
}
void
init_varasm_once ()
{
const_str_htab = htab_create (128, const_str_htab_hash, const_str_htab_eq,
const_str_htab_del);
ggc_add_root (const_hash_table, MAX_HASH_TABLE, sizeof const_hash_table[0],
mark_const_hash_entry);
ggc_add_root (&const_str_htab, 1, sizeof const_str_htab,
mark_const_str_htab);
}
/* Select a set of attributes for section NAME based on the properties
of DECL and whether or not RELOC indicates that DECL's initializer
might contain runtime relocations.
We make the section read-only and executable for a function decl,
read-only for a const data decl, and writable for a non-const data decl.
If the section has already been defined, to not allow it to have
different attributes, as (1) this is ambiguous since we're not seeing
all the declarations up front and (2) some assemblers (e.g. SVR4)
do not recoginize section redefinitions. */
unsigned int
default_section_type_flags (decl, name, reloc)
tree decl;
const char *name;
int reloc;
{
static htab_t htab;
unsigned int flags;
unsigned int **slot;
/* The names we put in the hashtable will always be the unique
versions gived to us by the stringtable, so we can just use
their addresses as the keys. */
if (!htab)
htab = htab_create (31, htab_hash_pointer, htab_eq_pointer, NULL);
if (decl && TREE_CODE (decl) == FUNCTION_DECL)
flags = SECTION_CODE;
else if (decl && DECL_READONLY_SECTION (decl, reloc))
flags = 0;
else
flags = SECTION_WRITE;
if (decl && DECL_ONE_ONLY (decl))
flags |= SECTION_LINKONCE;
if (strcmp (name, ".bss") == 0
|| strncmp (name, ".bss.", 5) == 0
|| strncmp (name, ".gnu.linkonce.b.", 16) == 0
|| strcmp (name, ".sbss") == 0
|| strncmp (name, ".sbss.", 6) == 0
|| strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
flags |= SECTION_BSS;
/* See if we already have an entry for this section. */
slot = (unsigned int **) htab_find_slot (htab, name, INSERT);
if (!*slot)
{
*slot = (unsigned int *) xmalloc (sizeof (unsigned int));
**slot = flags;
}
else
{
if (decl && **slot != flags)
error_with_decl (decl, "%s causes a section type conflict");
}
return flags;
}
/* Output assembly to switch to section NAME with attribute FLAGS.
Four variants for common object file formats. */
void
default_no_named_section (name, flags, align)
const char *name ATTRIBUTE_UNUSED;
unsigned int flags ATTRIBUTE_UNUSED;
unsigned int align ATTRIBUTE_UNUSED;
{
/* Some object formats don't support named sections at all. The
front-end should already have flagged this as an error. */
abort ();
}
void
default_elf_asm_named_section (name, flags, align)
const char *name;
unsigned int flags;
unsigned int align ATTRIBUTE_UNUSED;
{
char flagchars[8], *f = flagchars;
const char *type;
if (!(flags & SECTION_DEBUG))
*f++ = 'a';
if (flags & SECTION_WRITE)
*f++ = 'w';
if (flags & SECTION_CODE)
*f++ = 'x';
if (flags & SECTION_SMALL)
*f++ = 's';
*f = '\0';
if (flags & SECTION_BSS)
type = "nobits";
else
type = "progbits";
fprintf (asm_out_file, "\t.section\t%s,\"%s\",@%s\n",
name, flagchars, type);
}
void
default_coff_asm_named_section (name, flags, align)
const char *name;
unsigned int flags;
unsigned int align ATTRIBUTE_UNUSED;
{
char flagchars[8], *f = flagchars;
if (flags & SECTION_WRITE)
*f++ = 'w';
if (flags & SECTION_CODE)
*f++ = 'x';
*f = '\0';
fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
}
void
default_pe_asm_named_section (name, flags, align)
const char *name;
unsigned int flags;
unsigned int align ATTRIBUTE_UNUSED;
{
default_coff_asm_named_section (name, flags, align);
if (flags & SECTION_LINKONCE)
{
/* Functions may have been compiled at various levels of
optimization so we can't use `same_size' here.
Instead, have the linker pick one. */
fprintf (asm_out_file, "\t.linkonce %s\n",
(flags & SECTION_CODE ? "discard" : "same_size"));
}
}
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