/* Expands front end tree to back end RTL for GNU C-Compiler
- Copyright (C) 1987, 88, 89, 91-97, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1987, 88, 89, 91-98, 1999 Free Software Foundation, Inc.
This file is part of GNU CC.
#include "obstack.h"
#include "toplev.h"
+#if !defined PREFERRED_STACK_BOUNDARY && defined STACK_BOUNDARY
+#define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
+#endif
+
#ifndef TRAMPOLINE_ALIGNMENT
#define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
#endif
int current_function_contains_functions;
+/* Nonzero if function being compiled doesn't modify the stack pointer
+ (ignoring the prologue and epilogue). This is only valid after
+ life_analysis has run. */
+
+int current_function_sp_is_unchanging;
+
/* Nonzero if the current function is a thunk (a lightweight function that
just adjusts one of its arguments and forwards to another function), so
we should try to cut corners where we can. */
generated. */
int current_function_instrument_entry_exit;
+/* Nonzero if memory access checking be enabled in the current function. */
+int current_function_check_memory_usage;
+
/* The FUNCTION_DECL for an inline function currently being expanded. */
tree inline_function_decl;
tree nonlocal_labels;
-/* RTX for stack slot that holds the current handler for nonlocal gotos.
+/* List (chain of EXPR_LIST) of stack slots that hold the current handlers
+ for nonlocal gotos. There is one for every nonlocal label in the function;
+ this list matches the one in nonlocal_labels.
Zero when function does not have nonlocal labels. */
-rtx nonlocal_goto_handler_slot;
+rtx nonlocal_goto_handler_slots;
/* RTX for stack slot that holds the stack pointer value to restore
for a nonlocal goto.
p->parm_reg_stack_loc = parm_reg_stack_loc;
p->outgoing_args_size = current_function_outgoing_args_size;
p->return_rtx = current_function_return_rtx;
- p->nonlocal_goto_handler_slot = nonlocal_goto_handler_slot;
+ p->nonlocal_goto_handler_slots = nonlocal_goto_handler_slots;
p->nonlocal_goto_stack_level = nonlocal_goto_stack_level;
p->nonlocal_labels = nonlocal_labels;
p->cleanup_label = cleanup_label;
p->fixup_var_refs_queue = 0;
p->epilogue_delay_list = current_function_epilogue_delay_list;
p->args_info = current_function_args_info;
+ p->check_memory_usage = current_function_check_memory_usage;
p->instrument_entry_exit = current_function_instrument_entry_exit;
save_tree_status (p, context);
parm_reg_stack_loc = p->parm_reg_stack_loc;
current_function_outgoing_args_size = p->outgoing_args_size;
current_function_return_rtx = p->return_rtx;
- nonlocal_goto_handler_slot = p->nonlocal_goto_handler_slot;
+ nonlocal_goto_handler_slots = p->nonlocal_goto_handler_slots;
nonlocal_goto_stack_level = p->nonlocal_goto_stack_level;
nonlocal_labels = p->nonlocal_labels;
cleanup_label = p->cleanup_label;
current_function_epilogue_delay_list = p->epilogue_delay_list;
reg_renumber = 0;
current_function_args_info = p->args_info;
+ current_function_check_memory_usage = p->check_memory_usage;
current_function_instrument_entry_exit = p->instrument_entry_exit;
restore_tree_status (p, context);
/* Allocate fixed slots in the stack frame of the current function. */
/* Return size needed for stack frame based on slots so far allocated.
- This size counts from zero. It is not rounded to STACK_BOUNDARY;
+ This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY;
the caller may have to do that. */
HOST_WIDE_INT
set from before. */
RTX_UNCHANGING_P (p->slot) = 0;
MEM_IN_STRUCT_P (p->slot) = 0;
+ MEM_SCALAR_P (p->slot) = 0;
+ MEM_ALIAS_SET (p->slot) = 0;
return p->slot;
}
\f
size = TREE_INT_CST_LOW (TYPE_ARRAY_MAX_SIZE (type));
tmp = assign_stack_temp (mode, size, keep);
- MEM_IN_STRUCT_P (tmp) = AGGREGATE_TYPE_P (type);
+ MEM_SET_IN_STRUCT_P (tmp, AGGREGATE_TYPE_P (type));
return tmp;
}
else
return;
- if (flag_check_memory_usage)
+ if (current_function_check_memory_usage)
emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
XEXP (reg, 0), ptr_mode,
GEN_INT (GET_MODE_SIZE (GET_MODE (reg))),
previously generated stack slot, then we need to copy the bit in
case it was set for other reasons. For instance, it is set for
__builtin_va_alist. */
- MEM_IN_STRUCT_P (reg) = AGGREGATE_TYPE_P (type) | MEM_IN_STRUCT_P (new);
+ MEM_SET_IN_STRUCT_P (reg,
+ AGGREGATE_TYPE_P (type) || MEM_IN_STRUCT_P (new));
MEM_ALIAS_SET (reg) = get_alias_set (type);
/* Now make sure that all refs to the variable, previously made
newmem = gen_rtx_MEM (wanted_mode,
plus_constant (XEXP (tem, 0), offset));
RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem);
- MEM_VOLATILE_P (newmem) = MEM_VOLATILE_P (tem);
- MEM_IN_STRUCT_P (newmem) = MEM_IN_STRUCT_P (tem);
+ MEM_COPY_ATTRIBUTES (newmem, tem);
/* Make the change and see if the insn remains valid. */
INSN_CODE (insn) = -1;
newmem = gen_rtx_MEM (wanted_mode,
plus_constant (XEXP (tem, 0), offset));
RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem);
- MEM_VOLATILE_P (newmem) = MEM_VOLATILE_P (tem);
- MEM_IN_STRUCT_P (newmem) = MEM_IN_STRUCT_P (tem);
+ MEM_COPY_ATTRIBUTES (newmem, tem);
/* Make the change and see if the insn remains valid. */
INSN_CODE (insn) = -1;
PUT_CODE (reg, MEM);
PUT_MODE (reg, DECL_MODE (decl));
MEM_VOLATILE_P (reg) = TREE_SIDE_EFFECTS (decl);
- MEM_IN_STRUCT_P (reg) = AGGREGATE_TYPE_P (type);
+ MEM_SET_IN_STRUCT_P (reg, AGGREGATE_TYPE_P (type));
MEM_ALIAS_SET (reg) = get_alias_set (decl);
if (TREE_USED (decl) || DECL_INITIAL (decl) != 0)
TREE_USED (decl) || DECL_INITIAL (decl) != 0);
}
+/* List of replacements made below in purge_addressof_1 when creating
+ bitfield insertions. */
+static rtx purge_addressof_replacements;
+
/* Helper function for purge_addressof. See if the rtx expression at *LOC
in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into
the stack. */
insns = gen_sequence ();
end_sequence ();
- emit_insns_before (insns, insn);
+ emit_insn_before (insns, insn);
return;
}
else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force)
{
int size_x, size_sub;
+ if (!insn)
+ {
+ /* When processing REG_NOTES look at the list of
+ replacements done on the insn to find the register that X
+ was replaced by. */
+ rtx tem;
+
+ for (tem = purge_addressof_replacements; tem != NULL_RTX;
+ tem = XEXP (XEXP (tem, 1), 1))
+ {
+ rtx y = XEXP (tem, 0);
+ if (GET_CODE (y) == MEM
+ && rtx_equal_p (XEXP (x, 0), XEXP (y, 0)))
+ {
+ /* It can happen that the note may speak of things in
+ a wider (or just different) mode than the code did.
+ This is especially true of REG_RETVAL. */
+
+ rtx z = XEXP (XEXP (tem, 1), 0);
+ if (GET_MODE (x) != GET_MODE (y))
+ {
+ if (GET_CODE (z) == SUBREG && SUBREG_WORD (z) == 0)
+ z = SUBREG_REG (z);
+
+ /* ??? If we'd gotten into any of the really complex
+ cases below, I'm not sure we can do a proper
+ replacement. Might we be able to delete the
+ note in some cases? */
+ if (GET_MODE_SIZE (GET_MODE (x))
+ < GET_MODE_SIZE (GET_MODE (y)))
+ abort ();
+
+ z = gen_lowpart (GET_MODE (x), z);
+ }
+
+ *loc = z;
+ return;
+ }
+ }
+
+ /* There should always be such a replacement. */
+ abort ();
+ }
+
size_x = GET_MODE_BITSIZE (GET_MODE (x));
size_sub = GET_MODE_BITSIZE (GET_MODE (sub));
/* Don't even consider working with paradoxical subregs,
or the moral equivalent seen here. */
- if (size_x < size_sub)
+ if (size_x <= size_sub
+ && int_mode_for_mode (GET_MODE (sub)) != BLKmode)
{
/* Do a bitfield insertion to mirror what would happen
in memory. */
- int bitpos;
rtx val, seq;
- bitpos = 0;
- if (WORDS_BIG_ENDIAN)
- {
- bitpos += (size_sub / BITS_PER_WORD) * BITS_PER_WORD;
- bitpos -= (size_x / BITS_PER_WORD) * BITS_PER_WORD;
- }
- if (BYTES_BIG_ENDIAN)
- {
- bitpos += size_sub % BITS_PER_WORD;
- bitpos -= size_x % BITS_PER_WORD;
- }
-
if (store)
{
- /* If we can't replace with a register, be afraid. */
+ rtx p;
start_sequence ();
val = gen_reg_rtx (GET_MODE (x));
if (! validate_change (insn, loc, val, 0))
- abort ();
+ {
+ /* Discard the current sequence and put the
+ ADDRESSOF on stack. */
+ end_sequence ();
+ goto give_up;
+ }
seq = gen_sequence ();
end_sequence ();
emit_insn_before (seq, insn);
start_sequence ();
- store_bit_field (sub, size_x, bitpos, GET_MODE (x),
+ store_bit_field (sub, size_x, 0, GET_MODE (x),
val, GET_MODE_SIZE (GET_MODE (sub)),
GET_MODE_SIZE (GET_MODE (sub)));
+ /* Make sure to unshare any shared rtl that store_bit_field
+ might have created. */
+ for (p = get_insns(); p; p = NEXT_INSN (p))
+ {
+ reset_used_flags (PATTERN (p));
+ reset_used_flags (REG_NOTES (p));
+ reset_used_flags (LOG_LINKS (p));
+ }
+ unshare_all_rtl (get_insns ());
+
seq = gen_sequence ();
end_sequence ();
emit_insn_after (seq, insn);
else
{
start_sequence ();
- val = extract_bit_field (sub, size_x, bitpos, 1, NULL_RTX,
+ val = extract_bit_field (sub, size_x, 0, 1, NULL_RTX,
GET_MODE (x), GET_MODE (x),
GET_MODE_SIZE (GET_MODE (sub)),
GET_MODE_SIZE (GET_MODE (sub)));
- /* If we can't replace with a register, be afraid. */
if (! validate_change (insn, loc, val, 0))
- abort ();
+ {
+ /* Discard the current sequence and put the
+ ADDRESSOF on stack. */
+ end_sequence ();
+ goto give_up;
+ }
seq = gen_sequence ();
end_sequence ();
emit_insn_before (seq, insn);
}
+ /* Remember the replacement so that the same one can be done
+ on the REG_NOTES. */
+ purge_addressof_replacements
+ = gen_rtx_EXPR_LIST (VOIDmode, x,
+ gen_rtx_EXPR_LIST (VOIDmode, val,
+ purge_addressof_replacements));
+
/* We replaced with a reg -- all done. */
return;
}
}
else if (validate_change (insn, loc, sub, 0))
- goto restart;
+ {
+ /* Remember the replacement so that the same one can be done
+ on the REG_NOTES. */
+ purge_addressof_replacements
+ = gen_rtx_EXPR_LIST (VOIDmode, x,
+ gen_rtx_EXPR_LIST (VOIDmode, sub,
+ purge_addressof_replacements));
+ goto restart;
+ }
+ give_up:;
/* else give up and put it into the stack */
}
else if (code == ADDRESSOF)
asm_noperands (PATTERN (insn)) > 0, 0);
purge_addressof_1 (®_NOTES (insn), NULL_RTX, 0, 0);
}
+ purge_addressof_replacements = 0;
}
\f
/* Pass through the INSNS of function FNDECL and convert virtual register
TREE_CHAIN (last_t) = TREE_CHAIN (t);
}
}
- if (GET_CODE (insn) == INSN
- && ((nonlocal_goto_handler_slot != 0
- && reg_mentioned_p (nonlocal_goto_handler_slot, PATTERN (insn)))
+ if (GET_CODE (insn) == INSN)
+ {
+ int can_delete = 0;
+ rtx t;
+ for (t = nonlocal_goto_handler_slots; t != 0; t = XEXP (t, 1))
+ if (reg_mentioned_p (t, PATTERN (insn)))
+ {
+ can_delete = 1;
+ break;
+ }
+ if (can_delete
|| (nonlocal_goto_stack_level != 0
&& reg_mentioned_p (nonlocal_goto_stack_level,
- PATTERN (insn)))))
- delete_insn (insn);
+ PATTERN (insn))))
+ delete_insn (insn);
+ }
}
}
/* If this is a memory ref that contains aggregate components,
mark it as such for cse and loop optimize. Likewise if it
is readonly. */
- MEM_IN_STRUCT_P (stack_parm) = aggregate;
+ MEM_SET_IN_STRUCT_P (stack_parm, aggregate);
RTX_UNCHANGING_P (stack_parm) = TREE_READONLY (parm);
MEM_ALIAS_SET (stack_parm) = get_alias_set (parm);
}
/* If this is a memory ref that contains aggregate components,
mark it as such for cse and loop optimize. */
- MEM_IN_STRUCT_P (stack_parm) = aggregate;
+ MEM_SET_IN_STRUCT_P (stack_parm, aggregate);
}
#endif /* 0 */
/* If this is a memory ref that contains aggregate
components, mark it as such for cse and loop optimize. */
- MEM_IN_STRUCT_P (stack_parm) = aggregate;
+ MEM_SET_IN_STRUCT_P (stack_parm, aggregate);
}
else if (PARM_BOUNDARY % BITS_PER_WORD != 0)
{
DECL_RTL (parm)
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type)), parmreg);
- MEM_IN_STRUCT_P (DECL_RTL (parm)) = aggregate;
+ MEM_SET_IN_STRUCT_P (DECL_RTL (parm), aggregate);
}
else
DECL_RTL (parm) = parmreg;
if (nominal_mode != passed_mode
|| promoted_nominal_mode != promoted_mode)
{
+ int save_tree_used;
/* ENTRY_PARM has been converted to PROMOTED_MODE, its
mode, by the caller. We now have to convert it to
NOMINAL_MODE, if different. However, PARMREG may be in
push_to_sequence (conversion_insns);
tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp);
+ /* TREE_USED gets set erroneously during expand_assignment. */
+ save_tree_used = TREE_USED (parm);
expand_assignment (parm,
make_tree (nominal_type, tempreg), 0, 0);
+ TREE_USED (parm) = save_tree_used;
conversion_insns = get_insns ();
did_conversion = 1;
end_sequence ();
else
copy = assign_stack_temp (TYPE_MODE (type),
int_size_in_bytes (type), 1);
- MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type);
+ MEM_SET_IN_STRUCT_P (copy, AGGREGATE_TYPE_P (type));
RTX_UNCHANGING_P (copy) = TREE_READONLY (parm);
store_expr (parm, copy, 0);
emit_move_insn (parmreg, XEXP (copy, 0));
- if (flag_check_memory_usage)
+ if (current_function_check_memory_usage)
emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
XEXP (copy, 0), ptr_mode,
GEN_INT (int_size_in_bytes (type)),
GET_MODE_SIZE (GET_MODE (entry_parm)), 0);
/* If this is a memory ref that contains aggregate components,
mark it as such for cse and loop optimize. */
- MEM_IN_STRUCT_P (stack_parm) = aggregate;
+ MEM_SET_IN_STRUCT_P (stack_parm, aggregate);
}
if (promoted_mode != nominal_mode)
emit_move_insn (validize_mem (stack_parm),
validize_mem (entry_parm));
}
- if (flag_check_memory_usage)
+ if (current_function_check_memory_usage)
{
push_to_sequence (conversion_insns);
emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
DECL_RTL (result)
= gen_rtx_MEM (DECL_MODE (result), DECL_RTL (parm));
- MEM_IN_STRUCT_P (DECL_RTL (result)) = AGGREGATE_TYPE_P (restype);
+ MEM_SET_IN_STRUCT_P (DECL_RTL (result),
+ AGGREGATE_TYPE_P (restype));
}
if (TREE_THIS_VOLATILE (parm))
#endif
#endif
-#ifdef STACK_BOUNDARY
-#define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT)
+#ifdef PREFERRED_STACK_BOUNDARY
+#define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)
current_function_args_size
= ((current_function_args_size + STACK_BYTES - 1)
&& ! AGGREGATE_TYPE_P (TREE_TYPE (decl))
&& DECL_RTL (decl) != 0
&& GET_CODE (DECL_RTL (decl)) == REG
+ /* Global optimizations can make it difficult to determine if a
+ particular variable has been initialized. However, a VAR_DECL
+ with a nonzero DECL_INITIAL had an initializer, so do not
+ claim it is potentially uninitialized.
+
+ We do not care about the actual value in DECL_INITIAL, so we do
+ not worry that it may be a dangling pointer. */
+ && DECL_INITIAL (decl) == NULL_TREE
&& regno_uninitialized (REGNO (DECL_RTL (decl))))
warning_with_decl (decl,
"`%s' might be used uninitialized in this function");
stack_slot_list = 0;
/* There is no stack slot for handling nonlocal gotos. */
- nonlocal_goto_handler_slot = 0;
+ nonlocal_goto_handler_slots = 0;
nonlocal_goto_stack_level = 0;
/* No labels have been declared for nonlocal use. */
current_function_has_nonlocal_label = 0;
current_function_has_nonlocal_goto = 0;
current_function_contains_functions = 0;
+ current_function_sp_is_unchanging = 0;
current_function_is_thunk = 0;
current_function_returns_pcc_struct = 0;
valid operands of arithmetic insns. */
init_recog_no_volatile ();
+ /* Set this before generating any memory accesses. */
+ current_function_check_memory_usage
+ = (flag_check_memory_usage
+ && ! DECL_NO_CHECK_MEMORY_USAGE (current_function_decl));
+
current_function_instrument_entry_exit
= (flag_instrument_function_entry_exit
&& ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr));
{
DECL_RTL (DECL_RESULT (subr))
= gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), value_address);
- MEM_IN_STRUCT_P (DECL_RTL (DECL_RESULT (subr)))
- = AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr)));
+ MEM_SET_IN_STRUCT_P (DECL_RTL (DECL_RESULT (subr)),
+ AGGREGATE_TYPE_P (TREE_TYPE
+ (DECL_RESULT
+ (subr))));
}
}
else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode)
}
/* Delete handlers for nonlocal gotos if nothing uses them. */
- if (nonlocal_goto_handler_slot != 0 && !current_function_has_nonlocal_label)
+ if (nonlocal_goto_handler_slots != 0
+ && ! current_function_has_nonlocal_label)
delete_handlers ();
/* End any sequences that failed to be closed due to syntax errors. */
void
thread_prologue_and_epilogue_insns (f)
- rtx f;
+ rtx f ATTRIBUTE_UNUSED;
{
#ifdef HAVE_prologue
if (HAVE_prologue)
/* Include the new prologue insns in the first block. Ignore them
if they form a basic block unto themselves. */
- if (basic_block_head && n_basic_blocks
- && GET_CODE (basic_block_head[0]) != CODE_LABEL)
- basic_block_head[0] = NEXT_INSN (f);
+ if (x_basic_block_head && n_basic_blocks
+ && GET_CODE (BLOCK_HEAD (0)) != CODE_LABEL)
+ BLOCK_HEAD (0) = NEXT_INSN (f);
/* Retain a map of the prologue insns. */
prologue = record_insns (GET_CODE (seq) == SEQUENCE ? seq : head);
/* Include the new epilogue insns in the last block. Ignore
them if they form a basic block unto themselves. */
- if (basic_block_end && n_basic_blocks
- && GET_CODE (basic_block_end[n_basic_blocks - 1]) != JUMP_INSN)
- basic_block_end[n_basic_blocks - 1] = tail;
+ if (x_basic_block_end && n_basic_blocks
+ && GET_CODE (BLOCK_END (n_basic_blocks - 1)) != JUMP_INSN)
+ BLOCK_END (n_basic_blocks - 1) = tail;
/* Retain a map of the epilogue insns. */
epilogue = record_insns (GET_CODE (seq) == SEQUENCE ? seq : tail);
void
reposition_prologue_and_epilogue_notes (f)
- rtx f;
+ rtx f ATTRIBUTE_UNUSED;
{
#if defined (HAVE_prologue) || defined (HAVE_epilogue)
/* Reposition the prologue and epilogue notes. */
if (next)
PREV_INSN (next) = prev;
- /* Whether or not we can depend on basic_block_head,
+ /* Whether or not we can depend on BLOCK_HEAD,
attempt to keep it up-to-date. */
- if (basic_block_head[0] == note)
- basic_block_head[0] = next;
+ if (BLOCK_HEAD (0) == note)
+ BLOCK_HEAD (0) = next;
add_insn_after (note, insn);
}
if (next)
PREV_INSN (next) = prev;
- /* Whether or not we can depend on basic_block_head,
+ /* Whether or not we can depend on BLOCK_HEAD,
attempt to keep it up-to-date. */
if (n_basic_blocks
- && basic_block_head[n_basic_blocks-1] == insn)
- basic_block_head[n_basic_blocks-1] = note;
+ && BLOCK_HEAD (n_basic_blocks-1) == insn)
+ BLOCK_HEAD (n_basic_blocks-1) = note;
add_insn_before (note, insn);
}
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