/* Expands front end tree to back end RTL for GCC
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#include "langhooks.h"
#include "predict.h"
#include "optabs.h"
-
-/* Assume that case vectors are not pc-relative. */
-#ifndef CASE_VECTOR_PC_RELATIVE
-#define CASE_VECTOR_PC_RELATIVE 0
-#endif
+#include "target.h"
+#include "regs.h"
\f
/* Functions and data structures for expanding case statements. */
The position of an entry on `nesting_stack' is in its `depth' field.
Each type of construct has its own individual stack.
- For example, loops have `loop_stack'. Each object points to the
+ For example, loops have `cond_stack'. Each object points to the
next object of the same type through the `next' field.
Some constructs are visible to `break' exit-statements and others
rtx exit_label;
enum nesting_desc {
COND_NESTING,
- LOOP_NESTING,
BLOCK_NESTING,
CASE_NESTING
} desc;
This may be the end of the if or the next else/elseif. */
rtx next_label;
} GTY ((tag ("COND_NESTING"))) cond;
- /* For loops. */
- struct nesting_loop
- {
- /* Label at the top of the loop; place to loop back to. */
- rtx start_label;
- /* Label at the end of the whole construct. */
- rtx end_label;
- /* Label for `continue' statement to jump to;
- this is in front of the stepper of the loop. */
- rtx continue_label;
- } GTY ((tag ("LOOP_NESTING"))) loop;
/* For variable binding contours. */
struct nesting_block
{
conditional branch points. */
rtx last_unconditional_cleanup;
} GTY ((tag ("BLOCK_NESTING"))) block;
- /* For switch (C) or case (Pascal) statements,
- and also for dummies (see `expand_start_case_dummy'). */
+ /* For switch (C) or case (Pascal) statements. */
struct nesting_case
{
/* The insn after which the case dispatch should finally
/* Allocate and return a new `struct nesting'. */
-#define ALLOC_NESTING() \
- (struct nesting *) ggc_alloc (sizeof (struct nesting))
+#define ALLOC_NESTING() ggc_alloc (sizeof (struct nesting))
/* Pop the nesting stack element by element until we pop off
the element which is at the top of STACK.
do { struct nesting *target = STACK; \
struct nesting *this; \
do { this = nesting_stack; \
- if (loop_stack == this) \
- loop_stack = loop_stack->next; \
if (cond_stack == this) \
cond_stack = cond_stack->next; \
if (block_stack == this) \
/* Chain of all pending conditional statements. */
struct nesting * x_cond_stack;
- /* Chain of all pending loops. */
- struct nesting * x_loop_stack;
-
/* Chain of all pending case or switch statements. */
struct nesting * x_case_stack;
record the expr's type and its RTL value here. */
tree x_last_expr_type;
rtx x_last_expr_value;
+ rtx x_last_expr_alt_rtl;
/* Nonzero if within a ({...}) grouping, in which case we must
always compute a value for each expr-stmt in case it is the last one. */
#define block_stack (cfun->stmt->x_block_stack)
#define stack_block_stack (cfun->stmt->x_stack_block_stack)
#define cond_stack (cfun->stmt->x_cond_stack)
-#define loop_stack (cfun->stmt->x_loop_stack)
#define case_stack (cfun->stmt->x_case_stack)
#define nesting_stack (cfun->stmt->x_nesting_stack)
#define nesting_depth (cfun->stmt->x_nesting_depth)
#define current_block_start_count (cfun->stmt->x_block_start_count)
#define last_expr_type (cfun->stmt->x_last_expr_type)
#define last_expr_value (cfun->stmt->x_last_expr_value)
+#define last_expr_alt_rtl (cfun->stmt->x_last_expr_alt_rtl)
#define expr_stmts_for_value (cfun->stmt->x_expr_stmts_for_value)
#define emit_locus (cfun->stmt->x_emit_locus)
#define goto_fixup_chain (cfun->stmt->x_goto_fixup_chain)
/* Nonzero if we are using EH to handle cleanups. */
-static int using_eh_for_cleanups_p = 0;
+int using_eh_for_cleanups_p = 0;
static int n_occurrences (int, const char *);
-static bool parse_input_constraint (const char **, int, int, int, int,
- const char * const *, bool *, bool *);
static bool decl_conflicts_with_clobbers_p (tree, const HARD_REG_SET);
static void expand_goto_internal (tree, rtx, rtx);
static int expand_fixup (tree, rtx, rtx);
-static rtx expand_nl_handler_label (rtx, rtx);
static void expand_nl_goto_receiver (void);
-static void expand_nl_goto_receivers (struct nesting *);
static void fixup_gotos (struct nesting *, rtx, tree, rtx, int);
static bool check_operand_nalternatives (tree, tree);
static bool check_unique_operand_names (tree, tree);
static char *resolve_operand_name_1 (char *, tree, tree);
static void expand_null_return_1 (rtx);
static enum br_predictor return_prediction (rtx);
+static rtx shift_return_value (rtx);
static void expand_value_return (rtx);
static int tail_recursion_args (tree, tree);
static void expand_cleanups (tree, int, int);
void
init_stmt_for_function (void)
{
- cfun->stmt = ((struct stmt_status *)ggc_alloc (sizeof (struct stmt_status)));
-
- /* We are not currently within any block, conditional, loop or case. */
- block_stack = 0;
- stack_block_stack = 0;
- loop_stack = 0;
- case_stack = 0;
- cond_stack = 0;
- nesting_stack = 0;
- nesting_depth = 0;
-
- current_block_start_count = 0;
-
- /* No gotos have been expanded yet. */
- goto_fixup_chain = 0;
-
- /* We are not processing a ({...}) grouping. */
- expr_stmts_for_value = 0;
- clear_last_expr ();
+ cfun->stmt = ggc_alloc_cleared (sizeof (struct stmt_status));
}
\f
/* Record the current file and line. Called from emit_line_note. */
abort ();
if (!DECL_RTL_SET_P (label))
- SET_DECL_RTL (label, gen_label_rtx ());
+ {
+ rtx r = gen_label_rtx ();
+ SET_DECL_RTL (label, r);
+ if (FORCED_LABEL (label) || DECL_NONLOCAL (label))
+ LABEL_PRESERVE_P (r) = 1;
+ }
return DECL_RTL (label);
}
if (!function)
abort ();
- if (function != current_function_decl
- && function != inline_function_decl)
+ if (function != current_function_decl)
p = find_function_data (function);
else
p = cfun;
{
rtx x = expand_expr (exp, NULL_RTX, VOIDmode, 0);
-#ifdef POINTERS_EXTEND_UNSIGNED
- if (GET_MODE (x) != Pmode)
- x = convert_memory_address (Pmode, x);
-#endif
+ x = convert_memory_address (Pmode, x);
emit_queue ();
{
cfun->computed_goto_common_reg = copy_to_mode_reg (Pmode, x);
cfun->computed_goto_common_label = gen_label_rtx ();
- emit_label (cfun->computed_goto_common_label);
do_pending_stack_adjust ();
+ emit_label (cfun->computed_goto_common_label);
emit_indirect_jump (cfun->computed_goto_common_reg);
current_function_has_computed_jump = 1;
expand_label (tree label)
{
struct label_chain *p;
+ rtx label_r = label_rtx (label);
do_pending_stack_adjust ();
- emit_label (label_rtx (label));
+ emit_label (label_r);
if (DECL_NAME (label))
LABEL_NAME (DECL_RTL (label)) = IDENTIFIER_POINTER (DECL_NAME (label));
- if (stack_block_stack != 0)
+ if (DECL_NONLOCAL (label))
{
- p = (struct label_chain *) ggc_alloc (sizeof (struct label_chain));
- p->next = stack_block_stack->data.block.label_chain;
- stack_block_stack->data.block.label_chain = p;
- p->label = label;
+ expand_nl_goto_receiver ();
+ nonlocal_goto_handler_labels
+ = gen_rtx_EXPR_LIST (VOIDmode, label_r,
+ nonlocal_goto_handler_labels);
}
-}
-/* Declare that LABEL (a LABEL_DECL) may be used for nonlocal gotos
- from nested functions. */
+ if (FORCED_LABEL (label))
+ forced_labels = gen_rtx_EXPR_LIST (VOIDmode, label_r, forced_labels);
+
+ if (DECL_NONLOCAL (label) || FORCED_LABEL (label))
+ maybe_set_first_label_num (label_r);
-void
-declare_nonlocal_label (tree label)
-{
- rtx slot = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
-
- nonlocal_labels = tree_cons (NULL_TREE, label, nonlocal_labels);
- LABEL_PRESERVE_P (label_rtx (label)) = 1;
- if (nonlocal_goto_handler_slots == 0)
+ if (stack_block_stack != 0)
{
- emit_stack_save (SAVE_NONLOCAL,
- &nonlocal_goto_stack_level,
- PREV_INSN (tail_recursion_reentry));
+ p = ggc_alloc (sizeof (struct label_chain));
+ p->next = stack_block_stack->data.block.label_chain;
+ stack_block_stack->data.block.label_chain = p;
+ p->label = label;
}
- nonlocal_goto_handler_slots
- = gen_rtx_EXPR_LIST (VOIDmode, slot, nonlocal_goto_handler_slots);
}
/* Generate RTL code for a `goto' statement with target label LABEL.
void
expand_goto (tree label)
{
- tree context;
-
- /* Check for a nonlocal goto to a containing function. */
- context = decl_function_context (label);
+#ifdef ENABLE_CHECKING
+ /* Check for a nonlocal goto to a containing function. Should have
+ gotten translated to __builtin_nonlocal_goto. */
+ tree context = decl_function_context (label);
if (context != 0 && context != current_function_decl)
- {
- struct function *p = find_function_data (context);
- rtx label_ref = gen_rtx_LABEL_REF (Pmode, label_rtx (label));
- rtx handler_slot, static_chain, save_area, insn;
- tree link;
-
- /* Find the corresponding handler slot for this label. */
- handler_slot = p->x_nonlocal_goto_handler_slots;
- for (link = p->x_nonlocal_labels; TREE_VALUE (link) != label;
- link = TREE_CHAIN (link))
- handler_slot = XEXP (handler_slot, 1);
- handler_slot = XEXP (handler_slot, 0);
-
- p->has_nonlocal_label = 1;
- current_function_has_nonlocal_goto = 1;
- LABEL_REF_NONLOCAL_P (label_ref) = 1;
-
- /* Copy the rtl for the slots so that they won't be shared in
- case the virtual stack vars register gets instantiated differently
- in the parent than in the child. */
-
- static_chain = copy_to_reg (lookup_static_chain (label));
-
- /* Get addr of containing function's current nonlocal goto handler,
- which will do any cleanups and then jump to the label. */
- handler_slot = copy_to_reg (replace_rtx (copy_rtx (handler_slot),
- virtual_stack_vars_rtx,
- static_chain));
-
- /* Get addr of containing function's nonlocal save area. */
- save_area = p->x_nonlocal_goto_stack_level;
- if (save_area)
- save_area = replace_rtx (copy_rtx (save_area),
- virtual_stack_vars_rtx, static_chain);
-
-#if HAVE_nonlocal_goto
- if (HAVE_nonlocal_goto)
- emit_insn (gen_nonlocal_goto (static_chain, handler_slot,
- save_area, label_ref));
- else
+ abort ();
#endif
- {
- /* Restore frame pointer for containing function.
- This sets the actual hard register used for the frame pointer
- to the location of the function's incoming static chain info.
- The non-local goto handler will then adjust it to contain the
- proper value and reload the argument pointer, if needed. */
- emit_move_insn (hard_frame_pointer_rtx, static_chain);
- emit_stack_restore (SAVE_NONLOCAL, save_area, NULL_RTX);
-
- /* USE of hard_frame_pointer_rtx added for consistency;
- not clear if really needed. */
- emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
- emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
- emit_indirect_jump (handler_slot);
- }
- /* Search backwards to the jump insn and mark it as a
- non-local goto. */
- for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
- {
- if (GET_CODE (insn) == JUMP_INSN)
- {
- REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO,
- const0_rtx, REG_NOTES (insn));
- break;
- }
- else if (GET_CODE (insn) == CALL_INSN)
- break;
- }
- }
- else
- expand_goto_internal (label, label_rtx (label), NULL_RTX);
+ expand_goto_internal (label, label_rtx (label), NULL_RTX);
}
/* Generate RTL code for a `goto' statement with target label BODY.
&& (rtl_label == cond_stack->data.cond.endif_label
|| rtl_label == cond_stack->data.cond.next_label))
end_block = cond_stack;
- /* If we are in a loop, recognize certain labels which
- are likely targets. This reduces the number of fixups
- we need to create. */
- else if (loop_stack
- && (rtl_label == loop_stack->data.loop.start_label
- || rtl_label == loop_stack->data.loop.end_label
- || rtl_label == loop_stack->data.loop.continue_label))
- end_block = loop_stack;
else
end_block = 0;
if (block != end_block)
{
/* Ok, a fixup is needed. Add a fixup to the list of such. */
- struct goto_fixup *fixup
- = (struct goto_fixup *) ggc_alloc (sizeof (struct goto_fixup));
+ struct goto_fixup *fixup = ggc_alloc (sizeof (struct goto_fixup));
/* In case an old stack level is restored, make sure that comes
after any pending stack adjust. */
/* ?? If the fixup isn't to come at the present position,
`SUPERBLOCK') of any other BLOCK nodes which we might create
later on when we are expanding the fixup code.
- Note that optimization passes (including expand_end_loop)
- might move the *_BLOCK notes away, so we use a NOTE_INSN_DELETED
- as a placeholder. */
+ Note that optimization passes might move the *_BLOCK notes away,
+ so we use a NOTE_INSN_DELETED as a placeholder. */
{
rtx original_before_jump
TREE_USED (block) = 1;
if (!cfun->x_whole_function_mode_p)
- (*lang_hooks.decls.insert_block) (block);
+ lang_hooks.decls.insert_block (block);
else
{
BLOCK_CHAIN (block)
&& INSN_UID (first_insn) > INSN_UID (f->before_jump)
&& ! DECL_ERROR_ISSUED (f->target))
{
- error_with_decl (f->target,
- "label `%s' used before containing binding contour");
+ error ("%Jlabel '%D' used before containing binding contour",
+ f->target, f->target);
/* Prevent multiple errors for one label. */
DECL_ERROR_ISSUED (f->target) = 1;
}
logically be inserting the fixup code. We do this for the
sake of getting the debugging information right. */
- (*lang_hooks.decls.pushlevel) (0);
- (*lang_hooks.decls.set_block) (f->context);
+ lang_hooks.decls.pushlevel (0);
+ lang_hooks.decls.set_block (f->context);
/* Expand the cleanups for blocks this jump exits. */
if (f->cleanup_list_list)
destructed are still "in scope". */
cleanup_insns = get_insns ();
- (*lang_hooks.decls.poplevel) (1, 0, 0);
+ lang_hooks.decls.poplevel (1, 0, 0);
end_sequence ();
emit_insn_after (cleanup_insns, f->before_jump);
if (TREE_CHAIN (lists) == thisblock->data.block.outer_cleanups)
{
start_sequence ();
- (*lang_hooks.decls.pushlevel) (0);
- (*lang_hooks.decls.set_block) (f->context);
+ lang_hooks.decls.pushlevel (0);
+ lang_hooks.decls.set_block (f->context);
expand_cleanups (TREE_VALUE (lists), 1, 1);
do_pending_stack_adjust ();
cleanup_insns = get_insns ();
- (*lang_hooks.decls.poplevel) (1, 0, 0);
+ lang_hooks.decls.poplevel (1, 0, 0);
end_sequence ();
if (cleanup_insns != 0)
f->before_jump
/* Similar, but for input constraints. */
-static bool
+bool
parse_input_constraint (const char **constraint_p, int input_num,
int ninputs, int noutputs, int ninout,
const char * const * constraints,
const char *orig_constraint = constraint;
size_t c_len = strlen (constraint);
size_t j;
+ bool saw_match = false;
/* Assume the constraint doesn't allow the use of either
a register or memory. */
char *end;
unsigned long match;
+ saw_match = true;
+
match = strtoul (constraint + j, &end, 10);
if (match >= (unsigned long) noutputs)
{
break;
}
+ if (saw_match && !*allows_reg)
+ warning ("matching constraint does not allow a register");
+
return true;
}
+/* INPUT is one of the input operands from EXPR, an ASM_EXPR. Returns true
+ if it is an operand which must be passed in memory (i.e. an "m"
+ constraint), false otherwise. */
+
+bool
+asm_op_is_mem_input (tree input, tree expr)
+{
+ const char *constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (input)));
+ tree outputs = ASM_OUTPUTS (expr);
+ int noutputs = list_length (outputs);
+ const char **constraints
+ = (const char **) alloca ((noutputs) * sizeof (const char *));
+ int i = 0;
+ bool allows_mem, allows_reg;
+ tree t;
+
+ /* Collect output constraints. */
+ for (t = outputs; t ; t = TREE_CHAIN (t), i++)
+ constraints[i] = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
+
+ /* We pass 0 for input_num, ninputs and ninout; they are only used for
+ error checking which will be done at expand time. */
+ parse_input_constraint (&constraint, 0, 0, noutputs, 0, constraints,
+ &allows_mem, &allows_reg);
+ return (!allows_reg && allows_mem);
+}
+
/* Check for overlap between registers marked in CLOBBERED_REGS and
anything inappropriate in DECL. Emit error and return TRUE for error,
FALSE for ok. */
for (regno = REGNO (reg);
regno < (REGNO (reg)
- + HARD_REGNO_NREGS (REGNO (reg), GET_MODE (reg)));
+ + hard_regno_nregs[REGNO (reg)][GET_MODE (reg)]);
regno++)
if (TEST_HARD_REG_BIT (clobbered_regs, regno))
{
void
expand_asm_operands (tree string, tree outputs, tree inputs,
- tree clobbers, int vol, const char *filename, int line)
+ tree clobbers, int vol, location_t locus)
{
rtvec argvec, constraintvec;
rtx body;
tree t;
int i;
/* Vector of RTX's of evaluated output operands. */
- rtx *output_rtx = (rtx *) alloca (noutputs * sizeof (rtx));
- int *inout_opnum = (int *) alloca (noutputs * sizeof (int));
- rtx *real_output_rtx = (rtx *) alloca (noutputs * sizeof (rtx));
+ rtx *output_rtx = alloca (noutputs * sizeof (rtx));
+ int *inout_opnum = alloca (noutputs * sizeof (int));
+ rtx *real_output_rtx = alloca (noutputs * sizeof (rtx));
enum machine_mode *inout_mode
- = (enum machine_mode *) alloca (noutputs * sizeof (enum machine_mode));
+ = alloca (noutputs * sizeof (enum machine_mode));
const char **constraints
- = (const char **) alloca ((noutputs + ninputs) * sizeof (const char *));
+ = alloca ((noutputs + ninputs) * sizeof (const char *));
int old_generating_concat_p = generating_concat_p;
/* An ASM with no outputs needs to be treated as volatile, for now. */
if (! check_operand_nalternatives (outputs, inputs))
return;
- if (! check_unique_operand_names (outputs, inputs))
- return;
-
string = resolve_asm_operand_names (string, outputs, inputs);
/* Collect constraints. */
for (t = inputs; t ; t = TREE_CHAIN (t), i++)
constraints[i] = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
-#ifdef MD_ASM_CLOBBERS
/* Sometimes we wish to automatically clobber registers across an asm.
Case in point is when the i386 backend moved from cc0 to a hard reg --
maintaining source-level compatibility means automatically clobbering
the flags register. */
- MD_ASM_CLOBBERS (clobbers);
-#endif
+ clobbers = targetm.md_asm_clobbers (clobbers);
/* Count the number of meaningful clobbered registers, ignoring what
we would ignore later. */
|| (DECL_P (val)
&& GET_CODE (DECL_RTL (val)) == REG
&& GET_MODE (DECL_RTL (val)) != TYPE_MODE (type))))
- (*lang_hooks.mark_addressable) (val);
+ lang_hooks.mark_addressable (val);
if (is_inout)
ninout++;
return;
if (! allows_reg && allows_mem)
- (*lang_hooks.mark_addressable) (TREE_VALUE (tail));
+ lang_hooks.mark_addressable (TREE_VALUE (tail));
}
/* Second pass evaluates arguments. */
: GET_MODE (output_rtx[0])),
TREE_STRING_POINTER (string),
empty_string, 0, argvec, constraintvec,
- filename, line);
+ locus.file, locus.line);
MEM_VOLATILE_P (body) = vol;
if (CONSTANT_P (op))
{
- op = force_const_mem (TYPE_MODE (type), op);
- op = validize_mem (op);
+ rtx mem = force_const_mem (TYPE_MODE (type), op);
+ if (mem)
+ op = validize_mem (mem);
+ else
+ op = force_reg (TYPE_MODE (type), op);
}
- else if (GET_CODE (op) == REG
- || GET_CODE (op) == SUBREG
- || GET_CODE (op) == ADDRESSOF
- || GET_CODE (op) == CONCAT)
+ if (GET_CODE (op) == REG
+ || GET_CODE (op) == SUBREG
+ || GET_CODE (op) == ADDRESSOF
+ || GET_CODE (op) == CONCAT)
{
tree qual_type = build_qualified_type (type,
(TYPE_QUALS (type)
(GET_MODE (output_rtx[i]),
TREE_STRING_POINTER (string),
constraints[i], i, argvec, constraintvec,
- filename, line));
+ locus.file, locus.line));
MEM_VOLATILE_P (SET_SRC (XVECEXP (body, 0, i))) = vol;
}
free_temp_slots ();
}
+void
+expand_asm_expr (tree exp)
+{
+ int noutputs, i;
+ tree outputs, tail;
+ tree *o;
+
+ if (ASM_INPUT_P (exp))
+ {
+ expand_asm (ASM_STRING (exp), ASM_VOLATILE_P (exp));
+ return;
+ }
+
+ outputs = ASM_OUTPUTS (exp);
+ noutputs = list_length (outputs);
+ /* o[I] is the place that output number I should be written. */
+ o = (tree *) alloca (noutputs * sizeof (tree));
+
+ /* Record the contents of OUTPUTS before it is modified. */
+ for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
+ o[i] = TREE_VALUE (tail);
+
+ /* Generate the ASM_OPERANDS insn; store into the TREE_VALUEs of
+ OUTPUTS some trees for where the values were actually stored. */
+ expand_asm_operands (ASM_STRING (exp), outputs, ASM_INPUTS (exp),
+ ASM_CLOBBERS (exp), ASM_VOLATILE_P (exp),
+ input_location);
+
+ /* Copy all the intermediate outputs into the specified outputs. */
+ for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
+ {
+ if (o[i] != TREE_VALUE (tail))
+ {
+ expand_assignment (o[i], TREE_VALUE (tail), 0);
+ free_temp_slots ();
+
+ /* Restore the original value so that it's correct the next
+ time we expand this function. */
+ TREE_VALUE (tail) = o[i];
+ }
+ }
+
+ /* Those MODIFY_EXPRs could do autoincrements. */
+ emit_queue ();
+}
+
/* A subroutine of expand_asm_operands. Check that all operands have
the same number of alternatives. Return true if so. */
{
char *buffer;
char *p;
+ const char *c;
tree t;
+ check_unique_operand_names (outputs, inputs);
+
/* Substitute [<name>] in input constraint strings. There should be no
named operands in output constraints. */
for (t = inputs; t ; t = TREE_CHAIN (t))
{
- const char *c = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
+ c = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
if (strchr (c, '[') != NULL)
{
p = buffer = xstrdup (c);
}
}
- if (strchr (TREE_STRING_POINTER (string), '[') == NULL)
- return string;
-
- /* Assume that we will not need extra space to perform the substitution.
- This because we get to remove '[' and ']', which means we cannot have
- a problem until we have more than 999 operands. */
-
- p = buffer = xstrdup (TREE_STRING_POINTER (string));
- while ((p = strchr (p, '%')) != NULL)
+ /* Now check for any needed substitutions in the template. */
+ c = TREE_STRING_POINTER (string);
+ while ((c = strchr (c, '%')) != NULL)
{
- if (p[1] == '[')
- p += 1;
- else if (ISALPHA (p[1]) && p[2] == '[')
- p += 2;
+ if (c[1] == '[')
+ break;
+ else if (ISALPHA (c[1]) && c[2] == '[')
+ break;
else
{
- p += 1;
+ c += 1;
continue;
}
-
- p = resolve_operand_name_1 (p, outputs, inputs);
}
- string = build_string (strlen (buffer), buffer);
- free (buffer);
+ if (c)
+ {
+ /* OK, we need to make a copy so we can perform the substitutions.
+ Assume that we will not need extra space--we get to remove '['
+ and ']', which means we cannot have a problem until we have more
+ than 999 operands. */
+ buffer = xstrdup (TREE_STRING_POINTER (string));
+ p = buffer + (c - TREE_STRING_POINTER (string));
+
+ while ((p = strchr (p, '%')) != NULL)
+ {
+ if (p[1] == '[')
+ p += 1;
+ else if (ISALPHA (p[1]) && p[2] == '[')
+ p += 2;
+ else
+ {
+ p += 1;
+ continue;
+ }
+
+ p = resolve_operand_name_1 (p, outputs, inputs);
+ }
+
+ string = build_string (strlen (buffer), buffer);
+ free (buffer);
+ }
return string;
}
{
rtx value;
tree type;
+ rtx alt_rtl = NULL;
if (want_value == -1)
want_value = expr_stmts_for_value != 0;
except for last statement in ({...}) where they may be useful. */
if (! want_value
&& (expr_stmts_for_value == 0 || ! maybe_last)
- && exp != error_mark_node)
+ && exp != error_mark_node
+ && warn_unused_value)
{
- if (! TREE_SIDE_EFFECTS (exp))
- {
- if (warn_unused_value
- && !(TREE_CODE (exp) == CONVERT_EXPR
- && VOID_TYPE_P (TREE_TYPE (exp))))
- warning ("%Hstatement with no effect", &emit_locus);
- }
- else if (warn_unused_value)
+ if (TREE_SIDE_EFFECTS (exp))
warn_if_unused_value (exp);
+ else if (!VOID_TYPE_P (TREE_TYPE (exp)) && !TREE_NO_WARNING (exp))
+ warning ("%Hstatement with no effect", &emit_locus);
}
/* If EXP is of function type and we are expanding statements for
/* The call to `expand_expr' could cause last_expr_type and
last_expr_value to get reset. Therefore, we set last_expr_value
and last_expr_type *after* calling expand_expr. */
- value = expand_expr (exp, want_value ? NULL_RTX : const0_rtx,
- VOIDmode, 0);
+ value = expand_expr_real (exp, want_value ? NULL_RTX : const0_rtx,
+ VOIDmode, 0, &alt_rtl);
type = TREE_TYPE (exp);
/* If all we do is reference a volatile value in memory,
if (want_value)
{
last_expr_value = value;
+ last_expr_alt_rtl = alt_rtl;
last_expr_type = type;
}
case INIT_EXPR:
case TARGET_EXPR:
case CALL_EXPR:
- case METHOD_CALL_EXPR:
case RTL_EXPR:
case TRY_CATCH_EXPR:
case WITH_CLEANUP_EXPR:
return warn_if_unused_value (TREE_OPERAND (exp, 1));
case SAVE_EXPR:
- return warn_if_unused_value (TREE_OPERAND (exp, 1));
+ return warn_if_unused_value (TREE_OPERAND (exp, 0));
case TRUTH_ORIF_EXPR:
case TRUTH_ANDIF_EXPR:
return warn_if_unused_value (TREE_OPERAND (exp, 1));
case COMPOUND_EXPR:
- if (TREE_NO_UNUSED_WARNING (exp))
+ if (TREE_NO_WARNING (exp))
return 0;
if (warn_if_unused_value (TREE_OPERAND (exp, 0)))
return 1;
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
/* Don't warn about conversions not explicit in the user's program. */
- if (TREE_NO_UNUSED_WARNING (exp))
+ if (TREE_NO_WARNING (exp))
return 0;
/* Assignment to a cast usually results in a cast of a modify.
Don't complain about that. There can be an arbitrary number of
{
last_expr_type = NULL_TREE;
last_expr_value = NULL_RTX;
+ last_expr_alt_rtl = NULL_RTX;
}
/* Begin a statement-expression, i.e., a series of statements which
if (! last_expr_value || ! last_expr_type)
{
last_expr_value = const0_rtx;
+ last_expr_alt_rtl = NULL_RTX;
last_expr_type = void_type_node;
}
else if (GET_CODE (last_expr_value) != REG && ! CONSTANT_P (last_expr_value))
TREE_TYPE (t) = last_expr_type;
RTL_EXPR_RTL (t) = last_expr_value;
+ RTL_EXPR_ALT_RTL (t) = last_expr_alt_rtl;
RTL_EXPR_SEQUENCE (t) = get_insns ();
rtl_expr_chain = tree_cons (NULL_TREE, t, rtl_expr_chain);
clear_last_expr ();
}
\f
-/* Generate RTL for the start of a loop. EXIT_FLAG is nonzero if this
- loop should be exited by `exit_something'. This is a loop for which
- `expand_continue' will jump to the top of the loop.
-
- Make an entry on loop_stack to record the labels associated with
- this loop. */
-
-struct nesting *
-expand_start_loop (int exit_flag)
-{
- struct nesting *thisloop = ALLOC_NESTING ();
-
- /* Make an entry on loop_stack for the loop we are entering. */
-
- thisloop->desc = LOOP_NESTING;
- thisloop->next = loop_stack;
- thisloop->all = nesting_stack;
- thisloop->depth = ++nesting_depth;
- thisloop->data.loop.start_label = gen_label_rtx ();
- thisloop->data.loop.end_label = gen_label_rtx ();
- thisloop->data.loop.continue_label = thisloop->data.loop.start_label;
- thisloop->exit_label = exit_flag ? thisloop->data.loop.end_label : 0;
- loop_stack = thisloop;
- nesting_stack = thisloop;
-
- do_pending_stack_adjust ();
- emit_queue ();
- emit_note (NOTE_INSN_LOOP_BEG);
- emit_label (thisloop->data.loop.start_label);
-
- return thisloop;
-}
-
-/* Like expand_start_loop but for a loop where the continuation point
- (for expand_continue_loop) will be specified explicitly. */
-
-struct nesting *
-expand_start_loop_continue_elsewhere (int exit_flag)
-{
- struct nesting *thisloop = expand_start_loop (exit_flag);
- loop_stack->data.loop.continue_label = gen_label_rtx ();
- return thisloop;
-}
-
-/* Begin a null, aka do { } while (0) "loop". But since the contents
- of said loop can still contain a break, we must frob the loop nest. */
-
-struct nesting *
-expand_start_null_loop (void)
-{
- struct nesting *thisloop = ALLOC_NESTING ();
-
- /* Make an entry on loop_stack for the loop we are entering. */
-
- thisloop->desc = LOOP_NESTING;
- thisloop->next = loop_stack;
- thisloop->all = nesting_stack;
- thisloop->depth = ++nesting_depth;
- thisloop->data.loop.start_label = emit_note (NOTE_INSN_DELETED);
- thisloop->data.loop.end_label = gen_label_rtx ();
- thisloop->data.loop.continue_label = thisloop->data.loop.end_label;
- thisloop->exit_label = thisloop->data.loop.end_label;
- loop_stack = thisloop;
- nesting_stack = thisloop;
-
- return thisloop;
-}
-
-/* Specify the continuation point for a loop started with
- expand_start_loop_continue_elsewhere.
- Use this at the point in the code to which a continue statement
- should jump. */
-
-void
-expand_loop_continue_here (void)
-{
- do_pending_stack_adjust ();
- emit_note (NOTE_INSN_LOOP_CONT);
- emit_label (loop_stack->data.loop.continue_label);
-}
-
-/* Finish a loop. Generate a jump back to the top and the loop-exit label.
- Pop the block off of loop_stack. */
-
-void
-expand_end_loop (void)
-{
- rtx start_label = loop_stack->data.loop.start_label;
- rtx etc_note;
- int eh_regions, debug_blocks;
- bool empty_test;
-
- /* Mark the continue-point at the top of the loop if none elsewhere. */
- if (start_label == loop_stack->data.loop.continue_label)
- emit_note_before (NOTE_INSN_LOOP_CONT, start_label);
-
- do_pending_stack_adjust ();
-
- /* If the loop starts with a loop exit, roll that to the end where
- it will optimize together with the jump back.
-
- If the loop presently looks like this (in pseudo-C):
-
- LOOP_BEG
- start_label:
- if (test) goto end_label;
- LOOP_END_TOP_COND
- body;
- goto start_label;
- end_label:
-
- transform it to look like:
-
- LOOP_BEG
- goto start_label;
- top_label:
- body;
- start_label:
- if (test) goto end_label;
- goto top_label;
- end_label:
-
- We rely on the presence of NOTE_INSN_LOOP_END_TOP_COND to mark
- the end of the entry conditional. Without this, our lexical scan
- can't tell the difference between an entry conditional and a
- body conditional that exits the loop. Mistaking the two means
- that we can misplace the NOTE_INSN_LOOP_CONT note, which can
- screw up loop unrolling.
-
- Things will be oh so much better when loop optimization is done
- off of a proper control flow graph... */
-
- /* Scan insns from the top of the loop looking for the END_TOP_COND note. */
-
- empty_test = true;
- eh_regions = debug_blocks = 0;
- for (etc_note = start_label; etc_note ; etc_note = NEXT_INSN (etc_note))
- if (GET_CODE (etc_note) == NOTE)
- {
- if (NOTE_LINE_NUMBER (etc_note) == NOTE_INSN_LOOP_END_TOP_COND)
- break;
-
- /* We must not walk into a nested loop. */
- else if (NOTE_LINE_NUMBER (etc_note) == NOTE_INSN_LOOP_BEG)
- {
- etc_note = NULL_RTX;
- break;
- }
-
- /* At the same time, scan for EH region notes, as we don't want
- to scrog region nesting. This shouldn't happen, but... */
- else if (NOTE_LINE_NUMBER (etc_note) == NOTE_INSN_EH_REGION_BEG)
- eh_regions++;
- else if (NOTE_LINE_NUMBER (etc_note) == NOTE_INSN_EH_REGION_END)
- {
- if (--eh_regions < 0)
- /* We've come to the end of an EH region, but never saw the
- beginning of that region. That means that an EH region
- begins before the top of the loop, and ends in the middle
- of it. The existence of such a situation violates a basic
- assumption in this code, since that would imply that even
- when EH_REGIONS is zero, we might move code out of an
- exception region. */
- abort ();
- }
-
- /* Likewise for debug scopes. In this case we'll either (1) move
- all of the notes if they are properly nested or (2) leave the
- notes alone and only rotate the loop at high optimization
- levels when we expect to scrog debug info. */
- else if (NOTE_LINE_NUMBER (etc_note) == NOTE_INSN_BLOCK_BEG)
- debug_blocks++;
- else if (NOTE_LINE_NUMBER (etc_note) == NOTE_INSN_BLOCK_END)
- debug_blocks--;
- }
- else if (INSN_P (etc_note))
- empty_test = false;
-
- if (etc_note
- && optimize
- && ! empty_test
- && eh_regions == 0
- && (debug_blocks == 0 || optimize >= 2)
- && NEXT_INSN (etc_note) != NULL_RTX
- && ! any_condjump_p (get_last_insn ()))
- {
- /* We found one. Move everything from START to ETC to the end
- of the loop, and add a jump from the top of the loop. */
- rtx top_label = gen_label_rtx ();
- rtx start_move = start_label;
-
- /* If the start label is preceded by a NOTE_INSN_LOOP_CONT note,
- then we want to move this note also. */
- if (GET_CODE (PREV_INSN (start_move)) == NOTE
- && NOTE_LINE_NUMBER (PREV_INSN (start_move)) == NOTE_INSN_LOOP_CONT)
- start_move = PREV_INSN (start_move);
-
- emit_label_before (top_label, start_move);
-
- /* Actually move the insns. If the debug scopes are nested, we
- can move everything at once. Otherwise we have to move them
- one by one and squeeze out the block notes. */
- if (debug_blocks == 0)
- reorder_insns (start_move, etc_note, get_last_insn ());
- else
- {
- rtx insn, next_insn;
- for (insn = start_move; insn; insn = next_insn)
- {
- /* Figure out which insn comes after this one. We have
- to do this before we move INSN. */
- next_insn = (insn == etc_note ? NULL : NEXT_INSN (insn));
-
- if (GET_CODE (insn) == NOTE
- && (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG
- || NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END))
- continue;
-
- reorder_insns (insn, insn, get_last_insn ());
- }
- }
-
- /* Add the jump from the top of the loop. */
- emit_jump_insn_before (gen_jump (start_label), top_label);
- emit_barrier_before (top_label);
- start_label = top_label;
- }
-
- emit_jump (start_label);
- emit_note (NOTE_INSN_LOOP_END);
- emit_label (loop_stack->data.loop.end_label);
-
- POPSTACK (loop_stack);
-
- clear_last_expr ();
-}
-
-/* Finish a null loop, aka do { } while (0). */
-
-void
-expand_end_null_loop (void)
-{
- do_pending_stack_adjust ();
- emit_label (loop_stack->data.loop.end_label);
-
- POPSTACK (loop_stack);
-
- clear_last_expr ();
-}
-
-/* Generate a jump to the current loop's continue-point.
- This is usually the top of the loop, but may be specified
- explicitly elsewhere. If not currently inside a loop,
- return 0 and do nothing; caller will print an error message. */
-
-int
-expand_continue_loop (struct nesting *whichloop)
-{
- /* Emit information for branch prediction. */
- rtx note;
-
- if (flag_guess_branch_prob)
- {
- note = emit_note (NOTE_INSN_PREDICTION);
- NOTE_PREDICTION (note) = NOTE_PREDICT (PRED_CONTINUE, IS_TAKEN);
- }
- clear_last_expr ();
- if (whichloop == 0)
- whichloop = loop_stack;
- if (whichloop == 0)
- return 0;
- expand_goto_internal (NULL_TREE, whichloop->data.loop.continue_label,
- NULL_RTX);
- return 1;
-}
-
-/* Generate a jump to exit the current loop. If not currently inside a loop,
- return 0 and do nothing; caller will print an error message. */
-
-int
-expand_exit_loop (struct nesting *whichloop)
-{
- clear_last_expr ();
- if (whichloop == 0)
- whichloop = loop_stack;
- if (whichloop == 0)
- return 0;
- expand_goto_internal (NULL_TREE, whichloop->data.loop.end_label, NULL_RTX);
- return 1;
-}
-
-/* Generate a conditional jump to exit the current loop if COND
- evaluates to zero. If not currently inside a loop,
- return 0 and do nothing; caller will print an error message. */
-
-int
-expand_exit_loop_if_false (struct nesting *whichloop, tree cond)
-{
- rtx label;
- clear_last_expr ();
-
- if (whichloop == 0)
- whichloop = loop_stack;
- if (whichloop == 0)
- return 0;
-
- if (integer_nonzerop (cond))
- return 1;
- if (integer_zerop (cond))
- return expand_exit_loop (whichloop);
-
- /* Check if we definitely won't need a fixup. */
- if (whichloop == nesting_stack)
- {
- jumpifnot (cond, whichloop->data.loop.end_label);
- return 1;
- }
-
- /* In order to handle fixups, we actually create a conditional jump
- around an unconditional branch to exit the loop. If fixups are
- necessary, they go before the unconditional branch. */
-
- label = gen_label_rtx ();
- jumpif (cond, label);
- expand_goto_internal (NULL_TREE, whichloop->data.loop.end_label,
- NULL_RTX);
- emit_label (label);
-
- return 1;
-}
-
-/* Like expand_exit_loop_if_false except also emit a note marking
- the end of the conditional. Should only be used immediately
- after expand_loop_start. */
-
-int
-expand_exit_loop_top_cond (struct nesting *whichloop, tree cond)
-{
- if (! expand_exit_loop_if_false (whichloop, cond))
- return 0;
-
- emit_note (NOTE_INSN_LOOP_END_TOP_COND);
- return 1;
-}
-
/* Return nonzero if we should preserve sub-expressions as separate
pseudos. We never do so if we aren't optimizing. We always do so
- if -fexpensive-optimizations.
-
- Otherwise, we only do so if we are in the "early" part of a loop. I.e.,
- the loop may still be a small one. */
+ if -fexpensive-optimizations. */
int
preserve_subexpressions_p (void)
{
- rtx insn;
-
if (flag_expensive_optimizations)
return 1;
- if (optimize == 0 || cfun == 0 || cfun->stmt == 0 || loop_stack == 0)
+ if (optimize == 0 || cfun == 0 || cfun->stmt == 0)
return 0;
- insn = get_last_insn_anywhere ();
-
- return (insn
- && (INSN_UID (insn) - INSN_UID (loop_stack->data.loop.start_label)
- < n_non_fixed_regs * 3));
-
+ return 1;
}
-/* Generate a jump to exit the current loop, conditional, binding contour
- or case statement. Not all such constructs are visible to this function,
- only those started with EXIT_FLAG nonzero. Individual languages use
- the EXIT_FLAG parameter to control which kinds of constructs you can
- exit this way.
-
- If not currently inside anything that can be exited,
- return 0 and do nothing; caller will print an error message. */
-
-int
-expand_exit_something (void)
-{
- struct nesting *n;
- clear_last_expr ();
- for (n = nesting_stack; n; n = n->all)
- if (n->exit_label != 0)
- {
- expand_goto_internal (NULL_TREE, n->exit_label, NULL_RTX);
- return 1;
- }
-
- return 0;
-}
\f
/* Generate RTL to return from the current function, with no value.
(That is, we do not do anything about returning any value.) */
expand_null_return_1 (last_insn);
}
+/* Generate RTL to return directly from the current function.
+ (That is, we bypass any return value.) */
+
+void
+expand_naked_return (void)
+{
+ rtx last_insn, end_label;
+
+ last_insn = get_last_insn ();
+ end_label = naked_return_label;
+
+ clear_pending_stack_adjust ();
+ do_pending_stack_adjust ();
+ clear_last_expr ();
+
+ if (end_label == 0)
+ end_label = naked_return_label = gen_label_rtx ();
+ expand_goto_internal (NULL_TREE, end_label, last_insn);
+}
+
/* Try to guess whether the value of return means error code. */
static enum br_predictor
return_prediction (rtx val)
return PRED_NO_PREDICTION;
}
+
+/* If the current function returns values in the most significant part
+ of a register, shift return value VAL appropriately. The mode of
+ the function's return type is known not to be BLKmode. */
+
+static rtx
+shift_return_value (rtx val)
+{
+ tree type;
+
+ type = TREE_TYPE (DECL_RESULT (current_function_decl));
+ if (targetm.calls.return_in_msb (type))
+ {
+ rtx target;
+ HOST_WIDE_INT shift;
+
+ target = DECL_RTL (DECL_RESULT (current_function_decl));
+ shift = (GET_MODE_BITSIZE (GET_MODE (target))
+ - BITS_PER_UNIT * int_size_in_bytes (type));
+ if (shift > 0)
+ val = expand_binop (GET_MODE (target), ashl_optab,
+ gen_lowpart (GET_MODE (target), val),
+ GEN_INT (shift), target, 1, OPTAB_WIDEN);
+ }
+ return val;
+}
+
+
/* Generate RTL to return from the current function, with value VAL. */
static void
if (return_reg != val)
{
tree type = TREE_TYPE (DECL_RESULT (current_function_decl));
-#ifdef PROMOTE_FUNCTION_RETURN
- int unsignedp = TREE_UNSIGNED (type);
- enum machine_mode old_mode
- = DECL_MODE (DECL_RESULT (current_function_decl));
- enum machine_mode mode
- = promote_mode (type, old_mode, &unsignedp, 1);
-
- if (mode != old_mode)
- val = convert_modes (mode, old_mode, val, unsignedp);
-#endif
+ if (targetm.calls.promote_function_return (TREE_TYPE (current_function_decl)))
+ {
+ int unsignedp = TYPE_UNSIGNED (type);
+ enum machine_mode old_mode
+ = DECL_MODE (DECL_RESULT (current_function_decl));
+ enum machine_mode mode
+ = promote_mode (type, old_mode, &unsignedp, 1);
+
+ if (mode != old_mode)
+ val = convert_modes (mode, old_mode, val, unsignedp);
+ }
if (GET_CODE (return_reg) == PARALLEL)
emit_group_load (return_reg, val, type, int_size_in_bytes (type));
else
else if ((TREE_CODE (retval) == MODIFY_EXPR || TREE_CODE (retval) == INIT_EXPR)
&& TREE_CODE (TREE_OPERAND (retval, 0)) == RESULT_DECL)
retval_rhs = TREE_OPERAND (retval, 1);
- else if (VOID_TYPE_P (TREE_TYPE (retval)))
- /* Recognize tail-recursive call to void function. */
- retval_rhs = retval;
else
- retval_rhs = NULL_TREE;
+ retval_rhs = retval;
last_insn = get_last_insn ();
{
int i;
unsigned HOST_WIDE_INT bitpos, xbitpos;
- unsigned HOST_WIDE_INT big_endian_correction = 0;
+ unsigned HOST_WIDE_INT padding_correction = 0;
unsigned HOST_WIDE_INT bytes
= int_size_in_bytes (TREE_TYPE (retval_rhs));
int n_regs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
unsigned int bitsize
= MIN (TYPE_ALIGN (TREE_TYPE (retval_rhs)), BITS_PER_WORD);
- rtx *result_pseudos = (rtx *) alloca (sizeof (rtx) * n_regs);
+ rtx *result_pseudos = alloca (sizeof (rtx) * n_regs);
rtx result_reg, src = NULL_RTX, dst = NULL_RTX;
rtx result_val = expand_expr (retval_rhs, NULL_RTX, VOIDmode, 0);
enum machine_mode tmpmode, result_reg_mode;
return;
}
- /* Structures whose size is not a multiple of a word are aligned
- to the least significant byte (to the right). On a BYTES_BIG_ENDIAN
- machine, this means we must skip the empty high order bytes when
- calculating the bit offset. */
- if (BYTES_BIG_ENDIAN
- && bytes % UNITS_PER_WORD)
- big_endian_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD)
- * BITS_PER_UNIT));
+ /* If the structure doesn't take up a whole number of words, see
+ whether the register value should be padded on the left or on
+ the right. Set PADDING_CORRECTION to the number of padding
+ bits needed on the left side.
+
+ In most ABIs, the structure will be returned at the least end of
+ the register, which translates to right padding on little-endian
+ targets and left padding on big-endian targets. The opposite
+ holds if the structure is returned at the most significant
+ end of the register. */
+ if (bytes % UNITS_PER_WORD != 0
+ && (targetm.calls.return_in_msb (TREE_TYPE (retval_rhs))
+ ? !BYTES_BIG_ENDIAN
+ : BYTES_BIG_ENDIAN))
+ padding_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD)
+ * BITS_PER_UNIT));
/* Copy the structure BITSIZE bits at a time. */
- for (bitpos = 0, xbitpos = big_endian_correction;
+ for (bitpos = 0, xbitpos = padding_correction;
bitpos < bytes * BITS_PER_UNIT;
bitpos += bitsize, xbitpos += bitsize)
{
/* We need a new destination pseudo each time xbitpos is
- on a word boundary and when xbitpos == big_endian_correction
+ on a word boundary and when xbitpos == padding_correction
(the first time through). */
if (xbitpos % BITS_PER_WORD == 0
- || xbitpos == big_endian_correction)
+ || xbitpos == padding_correction)
{
/* Generate an appropriate register. */
dst = gen_reg_rtx (word_mode);
BITS_PER_WORD);
}
- /* Find the smallest integer mode large enough to hold the
- entire structure and use that mode instead of BLKmode
- on the USE insn for the return register. */
- for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
- tmpmode != VOIDmode;
- tmpmode = GET_MODE_WIDER_MODE (tmpmode))
- /* Have we found a large enough mode? */
- if (GET_MODE_SIZE (tmpmode) >= bytes)
- break;
+ tmpmode = GET_MODE (result_rtl);
+ if (tmpmode == BLKmode)
+ {
+ /* Find the smallest integer mode large enough to hold the
+ entire structure and use that mode instead of BLKmode
+ on the USE insn for the return register. */
+ for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+ tmpmode != VOIDmode;
+ tmpmode = GET_MODE_WIDER_MODE (tmpmode))
+ /* Have we found a large enough mode? */
+ if (GET_MODE_SIZE (tmpmode) >= bytes)
+ break;
- /* No suitable mode found. */
- if (tmpmode == VOIDmode)
- abort ();
+ /* No suitable mode found. */
+ if (tmpmode == VOIDmode)
+ abort ();
- PUT_MODE (result_rtl, tmpmode);
+ PUT_MODE (result_rtl, tmpmode);
+ }
if (GET_MODE_SIZE (tmpmode) < GET_MODE_SIZE (word_mode))
result_reg_mode = word_mode;
val = force_not_mem (val);
emit_queue ();
/* Return the calculated value, doing cleanups first. */
- expand_value_return (val);
+ expand_value_return (shift_return_value (val));
}
else
{
for (a = actuals, f = formals, i = 0; a && f; a = TREE_CHAIN (a), f = TREE_CHAIN (f), i++)
{
- if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (a)))
- != TYPE_MAIN_VARIANT (TREE_TYPE (f)))
+ if (!lang_hooks.types_compatible_p (TREE_TYPE (TREE_VALUE (a)),
+ TREE_TYPE (f)))
return 0;
if (GET_CODE (DECL_RTL (f)) != REG || DECL_MODE (f) == BLKmode)
return 0;
/* Compute all the actuals. */
- argvec = (rtx *) alloca (i * sizeof (rtx));
+ argvec = alloca (i * sizeof (rtx));
for (a = actuals, i = 0; a; a = TREE_CHAIN (a), i++)
argvec[i] = expand_expr (TREE_VALUE (a), NULL_RTX, VOIDmode, 0);
else
{
rtx tmp = argvec[i];
- int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_VALUE (a)));
+ int unsignedp = TYPE_UNSIGNED (TREE_TYPE (TREE_VALUE (a)));
promote_mode(TREE_TYPE (TREE_VALUE (a)), GET_MODE (tmp),
&unsignedp, 0);
if (DECL_MODE (f) != GET_MODE (DECL_RTL (f)))
abort ();
/* Create a note to mark the beginning of the block. */
- if (block_flag)
+ if (block_flag && !cfun->dont_emit_block_notes)
{
note = emit_note (NOTE_INSN_BLOCK_BEG);
NOTE_BLOCK (note) = block;
return cfun ? block_stack : 0;
}
-/* Emit a handler label for a nonlocal goto handler.
- Also emit code to store the handler label in SLOT before BEFORE_INSN. */
-
-static rtx
-expand_nl_handler_label (rtx slot, rtx before_insn)
-{
- rtx insns;
- rtx handler_label = gen_label_rtx ();
-
- /* Don't let cleanup_cfg delete the handler. */
- LABEL_PRESERVE_P (handler_label) = 1;
-
- start_sequence ();
- emit_move_insn (slot, gen_rtx_LABEL_REF (Pmode, handler_label));
- insns = get_insns ();
- end_sequence ();
- emit_insn_before (insns, before_insn);
-
- emit_label (handler_label);
-
- return handler_label;
-}
-
/* Emit code to restore vital registers at the beginning of a nonlocal goto
handler. */
static void
expand_nl_goto_receiver (void)
{
+ /* Clobber the FP when we get here, so we have to make sure it's
+ marked as used by this function. */
+ emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
+
+ /* Mark the static chain as clobbered here so life information
+ doesn't get messed up for it. */
+ emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
+
#ifdef HAVE_nonlocal_goto
if (! HAVE_nonlocal_goto)
#endif
if (HAVE_nonlocal_goto_receiver)
emit_insn (gen_nonlocal_goto_receiver ());
#endif
-}
-
-/* Make handlers for nonlocal gotos taking place in the function calls in
- block THISBLOCK. */
-
-static void
-expand_nl_goto_receivers (struct nesting *thisblock)
-{
- tree link;
- rtx afterward = gen_label_rtx ();
- rtx insns, slot;
- rtx label_list;
- int any_invalid;
-
- /* Record the handler address in the stack slot for that purpose,
- during this block, saving and restoring the outer value. */
- if (thisblock->next != 0)
- for (slot = nonlocal_goto_handler_slots; slot; slot = XEXP (slot, 1))
- {
- rtx save_receiver = gen_reg_rtx (Pmode);
- emit_move_insn (XEXP (slot, 0), save_receiver);
-
- start_sequence ();
- emit_move_insn (save_receiver, XEXP (slot, 0));
- insns = get_insns ();
- end_sequence ();
- emit_insn_before (insns, thisblock->data.block.first_insn);
- }
-
- /* Jump around the handlers; they run only when specially invoked. */
- emit_jump (afterward);
-
- /* Make a separate handler for each label. */
- link = nonlocal_labels;
- slot = nonlocal_goto_handler_slots;
- label_list = NULL_RTX;
- for (; link; link = TREE_CHAIN (link), slot = XEXP (slot, 1))
- /* Skip any labels we shouldn't be able to jump to from here,
- we generate one special handler for all of them below which just calls
- abort. */
- if (! DECL_TOO_LATE (TREE_VALUE (link)))
- {
- rtx lab;
- lab = expand_nl_handler_label (XEXP (slot, 0),
- thisblock->data.block.first_insn);
- label_list = gen_rtx_EXPR_LIST (VOIDmode, lab, label_list);
-
- expand_nl_goto_receiver ();
-
- /* Jump to the "real" nonlocal label. */
- expand_goto (TREE_VALUE (link));
- }
-
- /* A second pass over all nonlocal labels; this time we handle those
- we should not be able to jump to at this point. */
- link = nonlocal_labels;
- slot = nonlocal_goto_handler_slots;
- any_invalid = 0;
- for (; link; link = TREE_CHAIN (link), slot = XEXP (slot, 1))
- if (DECL_TOO_LATE (TREE_VALUE (link)))
- {
- rtx lab;
- lab = expand_nl_handler_label (XEXP (slot, 0),
- thisblock->data.block.first_insn);
- label_list = gen_rtx_EXPR_LIST (VOIDmode, lab, label_list);
- any_invalid = 1;
- }
-
- if (any_invalid)
- {
- expand_nl_goto_receiver ();
- expand_builtin_trap ();
- }
- nonlocal_goto_handler_labels = label_list;
- emit_label (afterward);
+ /* @@@ This is a kludge. Not all machine descriptions define a blockage
+ insn, but we must not allow the code we just generated to be reordered
+ by scheduling. Specifically, the update of the frame pointer must
+ happen immediately, not later. So emit an ASM_INPUT to act as blockage
+ insn. */
+ emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
}
/* Warn about any unused VARS (which may contain nodes other than
&& ! TREE_USED (decl)
&& ! DECL_IN_SYSTEM_HEADER (decl)
&& DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
- warning_with_decl (decl, "unused variable `%s'");
+ warning ("%Junused variable '%D'", decl, decl);
}
/* Generate RTL code to terminate a binding contour.
emit_label (thisblock->exit_label);
}
- /* If necessary, make handlers for nonlocal gotos taking
- place in the function calls in this block. */
- if (function_call_count != 0 && nonlocal_labels
- /* Make handler for outermost block
- if there were any nonlocal gotos to this function. */
- && (thisblock->next == 0 ? current_function_has_nonlocal_label
- /* Make handler for inner block if it has something
- special to do when you jump out of it. */
- : (thisblock->data.block.cleanups != 0
- || thisblock->data.block.stack_level != 0)))
- expand_nl_goto_receivers (thisblock);
-
/* Don't allow jumping into a block that has a stack level.
Cleanups are allowed, though. */
if (dont_jump_in > 0
that must be an error, because gotos without fixups
come from outside all saved stack-levels. */
if (TREE_ADDRESSABLE (chain->label))
- error_with_decl (chain->label,
- "label `%s' used before containing binding contour");
+ error ("%Jlabel '%D' used before containing binding contour",
+ chain->label, chain->label);
}
}
/* Don't let cleanups affect ({...}) constructs. */
int old_expr_stmts_for_value = expr_stmts_for_value;
rtx old_last_expr_value = last_expr_value;
+ rtx old_last_expr_alt_rtl = last_expr_alt_rtl;
tree old_last_expr_type = last_expr_type;
expr_stmts_for_value = 0;
expr_stmts_for_value = old_expr_stmts_for_value;
last_expr_value = old_last_expr_value;
+ last_expr_alt_rtl = old_last_expr_alt_rtl;
last_expr_type = old_last_expr_type;
/* Restore the stack level. */
{
emit_stack_restore (thisblock->next ? SAVE_BLOCK : SAVE_FUNCTION,
thisblock->data.block.stack_level, NULL_RTX);
- if (nonlocal_goto_handler_slots != 0)
- emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level,
- NULL_RTX);
+ if (cfun->nonlocal_goto_save_area)
+ update_nonlocal_goto_save_area ();
}
/* Any gotos out of this block must also do these things.
We do this now, after running cleanups on the variables
just going out of scope, so they are in scope for their cleanups. */
- if (mark_ends)
+ if (mark_ends && !cfun->dont_emit_block_notes)
{
rtx note = emit_note (NOTE_INSN_BLOCK_END);
NOTE_BLOCK (note) = NOTE_BLOCK (thisblock->data.block.first_insn);
&& (DECL_REGISTER (decl) || DECL_ARTIFICIAL (decl) || optimize))
{
/* Automatic variable that can go in a register. */
- int unsignedp = TREE_UNSIGNED (type);
+ int unsignedp = TYPE_UNSIGNED (type);
enum machine_mode reg_mode
= promote_mode (type, DECL_MODE (decl), &unsignedp, 0);
do_pending_stack_adjust ();
save_stack_pointer ();
- /* In function-at-a-time mode, variable_size doesn't expand this,
- so do it now. */
- if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type))
- expand_expr (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
- const0_rtx, VOIDmode, 0);
-
- /* Compute the variable's size, in bytes. */
+ /* Compute the variable's size, in bytes. This will expand any
+ needed SAVE_EXPRs for the first time. */
size = expand_expr (DECL_SIZE_UNIT (decl), NULL_RTX, VOIDmode, 0);
free_temp_slots ();
}
}
\f
+/* Emit code to allocate T_SIZE bytes of dynamic stack space for ALLOC. */
+void
+expand_stack_alloc (tree alloc, tree t_size)
+{
+ rtx address, dest, size;
+ tree var, type;
+
+ if (TREE_CODE (alloc) != ADDR_EXPR)
+ abort ();
+ var = TREE_OPERAND (alloc, 0);
+ if (TREE_CODE (var) != VAR_DECL)
+ abort ();
+
+ type = TREE_TYPE (var);
+
+ /* In function-at-a-time mode, variable_size doesn't expand this,
+ so do it now. */
+ if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type))
+ expand_expr (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
+ const0_rtx, VOIDmode, 0);
+
+ /* Compute the variable's size, in bytes. */
+ size = expand_expr (t_size, NULL_RTX, VOIDmode, 0);
+ free_temp_slots ();
+
+ /* Allocate space on the stack for the variable. */
+ address = XEXP (DECL_RTL (var), 0);
+ dest = allocate_dynamic_stack_space (size, address, TYPE_ALIGN (type));
+ if (dest != address)
+ emit_move_insn (address, dest);
+
+ /* Indicate the alignment we actually gave this variable. */
+#ifdef STACK_BOUNDARY
+ DECL_ALIGN (var) = STACK_BOUNDARY;
+#else
+ DECL_ALIGN (var) = BIGGEST_ALIGNMENT;
+#endif
+ DECL_USER_ALIGN (var) = 0;
+}
+
+/* Emit code to save the current value of stack. */
+rtx
+expand_stack_save (void)
+{
+ rtx ret = NULL_RTX;
+
+ do_pending_stack_adjust ();
+ emit_stack_save (SAVE_BLOCK, &ret, NULL_RTX);
+ return ret;
+}
+
+/* Emit code to restore the current value of stack. */
+void
+expand_stack_restore (tree var)
+{
+ rtx sa = DECL_RTL (var);
+
+ emit_stack_restore (SAVE_BLOCK, sa, NULL_RTX);
+}
+\f
/* Emit code to perform the initialization of a declaration DECL. */
void
if (code == INTEGER_TYPE || code == REAL_TYPE || code == ENUMERAL_TYPE
|| code == POINTER_TYPE || code == REFERENCE_TYPE)
expand_assignment (decl, convert (TREE_TYPE (decl), integer_zero_node),
- 0, 0);
+ 0);
emit_queue ();
}
else if (DECL_INITIAL (decl) && TREE_CODE (DECL_INITIAL (decl)) != TREE_LIST)
{
emit_line_note (DECL_SOURCE_LOCATION (decl));
- expand_assignment (decl, DECL_INITIAL (decl), 0, 0);
+ expand_assignment (decl, DECL_INITIAL (decl), 0);
emit_queue ();
}
emit_move_insn (flag, const1_rtx);
cond = build_decl (VAR_DECL, NULL_TREE,
- (*lang_hooks.types.type_for_mode) (word_mode, 1));
+ lang_hooks.types.type_for_mode (word_mode, 1));
SET_DECL_RTL (cond, flag);
/* Conditionalize the cleanup. */
cleanup = build (COND_EXPR, void_type_node,
- (*lang_hooks.truthvalue_conversion) (cond),
+ lang_hooks.truthvalue_conversion (cond),
cleanup, integer_zero_node);
cleanup = fold (cleanup);
return block_stack->data.block.cleanups;
}
+
+/* Return nonzero if any containing block has a stack level or
+ cleanups. */
+
+int
+containing_blocks_have_cleanups_or_stack_level (void)
+{
+ struct nesting *block;
+
+ for (block = block_stack; block; block = block->next)
+ if (block->data.block.stack_level != 0
+ || block->data.block.cleanups != 0)
+ return 1;
+
+ return 0;
+}
+
/* Return 1 if there are any pending cleanups at this point.
Check the current contour as well as contours that enclose
the current contour. */
start_cleanup_deferral ();
}
-
-/* Start a "dummy case statement" within which case labels are invalid
- and are not connected to any larger real case statement.
- This can be used if you don't want to let a case statement jump
- into the middle of certain kinds of constructs. */
-
-void
-expand_start_case_dummy (void)
-{
- struct nesting *thiscase = ALLOC_NESTING ();
-
- /* Make an entry on case_stack for the dummy. */
-
- thiscase->desc = CASE_NESTING;
- thiscase->next = case_stack;
- thiscase->all = nesting_stack;
- thiscase->depth = ++nesting_depth;
- thiscase->exit_label = 0;
- thiscase->data.case_stmt.case_list = 0;
- thiscase->data.case_stmt.start = 0;
- thiscase->data.case_stmt.nominal_type = 0;
- thiscase->data.case_stmt.default_label = 0;
- case_stack = thiscase;
- nesting_stack = thiscase;
- start_cleanup_deferral ();
-}
\f
static void
check_seenlabel (void)
|| ! int_fits_type_p (value, index_type)))
return 3;
- return add_case_node (value, value, label, duplicate);
+ return add_case_node (value, value, label, duplicate, false);
}
/* Like pushcase but this case applies to all values between VALUE1 and
|| ! int_fits_type_p (value2, index_type))
return 3;
- return add_case_node (value1, value2, label, duplicate);
+ return add_case_node (value1, value2, label, duplicate, false);
}
/* Do the actual insertion of a case label for pushcase and pushcase_range
slowdown for large switch statements. */
int
-add_case_node (tree low, tree high, tree label, tree *duplicate)
+add_case_node (tree low, tree high, tree label, tree *duplicate,
+ bool dont_expand_label)
{
struct case_node *p, **q, *r;
return 2;
}
case_stack->data.case_stmt.default_label = label;
- expand_label (label);
+ if (!dont_expand_label)
+ expand_label (label);
return 0;
}
/* Add this label to the chain, and succeed. */
- r = (struct case_node *) ggc_alloc (sizeof (struct case_node));
+ r = ggc_alloc (sizeof (struct case_node));
r->low = low;
/* If the bounds are equal, turn this into the one-value case. */
r->high = high;
r->code_label = label;
- expand_label (label);
+ if (!dont_expand_label)
+ expand_label (label);
*q = r;
r->parent = p;
return 0;
}
\f
-/* Returns the number of possible values of TYPE.
- Returns -1 if the number is unknown, variable, or if the number does not
- fit in a HOST_WIDE_INT.
- Sets *SPARSENESS to 2 if TYPE is an ENUMERAL_TYPE whose values
- do not increase monotonically (there may be duplicates);
- to 1 if the values increase monotonically, but not always by 1;
- otherwise sets it to 0. */
-
-HOST_WIDE_INT
-all_cases_count (tree type, int *sparseness)
-{
- tree t;
- HOST_WIDE_INT count, minval, lastval;
-
- *sparseness = 0;
-
- switch (TREE_CODE (type))
- {
- case BOOLEAN_TYPE:
- count = 2;
- break;
-
- case CHAR_TYPE:
- count = 1 << BITS_PER_UNIT;
- break;
-
- default:
- case INTEGER_TYPE:
- if (TYPE_MAX_VALUE (type) != 0
- && 0 != (t = fold (build (MINUS_EXPR, type, TYPE_MAX_VALUE (type),
- TYPE_MIN_VALUE (type))))
- && 0 != (t = fold (build (PLUS_EXPR, type, t,
- convert (type, integer_zero_node))))
- && host_integerp (t, 1))
- count = tree_low_cst (t, 1);
- else
- return -1;
- break;
-
- case ENUMERAL_TYPE:
- /* Don't waste time with enumeral types with huge values. */
- if (! host_integerp (TYPE_MIN_VALUE (type), 0)
- || TYPE_MAX_VALUE (type) == 0
- || ! host_integerp (TYPE_MAX_VALUE (type), 0))
- return -1;
-
- lastval = minval = tree_low_cst (TYPE_MIN_VALUE (type), 0);
- count = 0;
-
- for (t = TYPE_VALUES (type); t != NULL_TREE; t = TREE_CHAIN (t))
- {
- HOST_WIDE_INT thisval = tree_low_cst (TREE_VALUE (t), 0);
-
- if (*sparseness == 2 || thisval <= lastval)
- *sparseness = 2;
- else if (thisval != minval + count)
- *sparseness = 1;
-
- lastval = thisval;
- count++;
- }
- }
-
- return count;
-}
-
-#define BITARRAY_TEST(ARRAY, INDEX) \
- ((ARRAY)[(unsigned) (INDEX) / HOST_BITS_PER_CHAR]\
- & (1 << ((unsigned) (INDEX) % HOST_BITS_PER_CHAR)))
-#define BITARRAY_SET(ARRAY, INDEX) \
- ((ARRAY)[(unsigned) (INDEX) / HOST_BITS_PER_CHAR]\
- |= 1 << ((unsigned) (INDEX) % HOST_BITS_PER_CHAR))
-
-/* Set the elements of the bitstring CASES_SEEN (which has length COUNT),
- with the case values we have seen, assuming the case expression
- has the given TYPE.
- SPARSENESS is as determined by all_cases_count.
-
- The time needed is proportional to COUNT, unless
- SPARSENESS is 2, in which case quadratic time is needed. */
-
-void
-mark_seen_cases (tree type, unsigned char *cases_seen, HOST_WIDE_INT count,
- int sparseness)
-{
- tree next_node_to_try = NULL_TREE;
- HOST_WIDE_INT next_node_offset = 0;
-
- struct case_node *n, *root = case_stack->data.case_stmt.case_list;
- tree val = make_node (INTEGER_CST);
-
- TREE_TYPE (val) = type;
- if (! root)
- /* Do nothing. */
- ;
- else if (sparseness == 2)
- {
- tree t;
- unsigned HOST_WIDE_INT xlo;
-
- /* This less efficient loop is only needed to handle
- duplicate case values (multiple enum constants
- with the same value). */
- TREE_TYPE (val) = TREE_TYPE (root->low);
- for (t = TYPE_VALUES (type), xlo = 0; t != NULL_TREE;
- t = TREE_CHAIN (t), xlo++)
- {
- TREE_INT_CST_LOW (val) = TREE_INT_CST_LOW (TREE_VALUE (t));
- TREE_INT_CST_HIGH (val) = TREE_INT_CST_HIGH (TREE_VALUE (t));
- n = root;
- do
- {
- /* Keep going past elements distinctly greater than VAL. */
- if (tree_int_cst_lt (val, n->low))
- n = n->left;
-
- /* or distinctly less than VAL. */
- else if (tree_int_cst_lt (n->high, val))
- n = n->right;
-
- else
- {
- /* We have found a matching range. */
- BITARRAY_SET (cases_seen, xlo);
- break;
- }
- }
- while (n);
- }
- }
- else
- {
- if (root->left)
- case_stack->data.case_stmt.case_list = root = case_tree2list (root, 0);
-
- for (n = root; n; n = n->right)
- {
- TREE_INT_CST_LOW (val) = TREE_INT_CST_LOW (n->low);
- TREE_INT_CST_HIGH (val) = TREE_INT_CST_HIGH (n->low);
- while (! tree_int_cst_lt (n->high, val))
- {
- /* Calculate (into xlo) the "offset" of the integer (val).
- The element with lowest value has offset 0, the next smallest
- element has offset 1, etc. */
-
- unsigned HOST_WIDE_INT xlo;
- HOST_WIDE_INT xhi;
- tree t;
-
- if (sparseness && TYPE_VALUES (type) != NULL_TREE)
- {
- /* The TYPE_VALUES will be in increasing order, so
- starting searching where we last ended. */
- t = next_node_to_try;
- xlo = next_node_offset;
- xhi = 0;
- for (;;)
- {
- if (t == NULL_TREE)
- {
- t = TYPE_VALUES (type);
- xlo = 0;
- }
- if (tree_int_cst_equal (val, TREE_VALUE (t)))
- {
- next_node_to_try = TREE_CHAIN (t);
- next_node_offset = xlo + 1;
- break;
- }
- xlo++;
- t = TREE_CHAIN (t);
- if (t == next_node_to_try)
- {
- xlo = -1;
- break;
- }
- }
- }
- else
- {
- t = TYPE_MIN_VALUE (type);
- if (t)
- neg_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t),
- &xlo, &xhi);
- else
- xlo = xhi = 0;
- add_double (xlo, xhi,
- TREE_INT_CST_LOW (val), TREE_INT_CST_HIGH (val),
- &xlo, &xhi);
- }
-
- if (xhi == 0 && xlo < (unsigned HOST_WIDE_INT) count)
- BITARRAY_SET (cases_seen, xlo);
-
- add_double (TREE_INT_CST_LOW (val), TREE_INT_CST_HIGH (val),
- 1, 0,
- &TREE_INT_CST_LOW (val), &TREE_INT_CST_HIGH (val));
- }
- }
- }
-}
-
-/* Given a switch statement with an expression that is an enumeration
- type, warn if any of the enumeration type's literals are not
- covered by the case expressions of the switch. Also, warn if there
- are any extra switch cases that are *not* elements of the
- enumerated type.
-
- Historical note:
-
- At one stage this function would: ``If all enumeration literals
- were covered by the case expressions, turn one of the expressions
- into the default expression since it should not be possible to fall
- through such a switch.''
-
- That code has since been removed as: ``This optimization is
- disabled because it causes valid programs to fail. ANSI C does not
- guarantee that an expression with enum type will have a value that
- is the same as one of the enumeration literals.'' */
-
-void
-check_for_full_enumeration_handling (tree type)
-{
- struct case_node *n;
- tree chain;
-
- /* True iff the selector type is a numbered set mode. */
- int sparseness = 0;
-
- /* The number of possible selector values. */
- HOST_WIDE_INT size;
-
- /* For each possible selector value. a one iff it has been matched
- by a case value alternative. */
- unsigned char *cases_seen;
-
- /* The allocated size of cases_seen, in chars. */
- HOST_WIDE_INT bytes_needed;
-
- size = all_cases_count (type, &sparseness);
- bytes_needed = (size + HOST_BITS_PER_CHAR) / HOST_BITS_PER_CHAR;
-
- if (size > 0 && size < 600000
- /* We deliberately use calloc here, not cmalloc, so that we can suppress
- this optimization if we don't have enough memory rather than
- aborting, as xmalloc would do. */
- && (cases_seen =
- (unsigned char *) really_call_calloc (bytes_needed, 1)) != NULL)
- {
- HOST_WIDE_INT i;
- tree v = TYPE_VALUES (type);
-
- /* The time complexity of this code is normally O(N), where
- N being the number of members in the enumerated type.
- However, if type is an ENUMERAL_TYPE whose values do not
- increase monotonically, O(N*log(N)) time may be needed. */
-
- mark_seen_cases (type, cases_seen, size, sparseness);
-
- for (i = 0; v != NULL_TREE && i < size; i++, v = TREE_CHAIN (v))
- if (BITARRAY_TEST (cases_seen, i) == 0)
- warning ("enumeration value `%s' not handled in switch",
- IDENTIFIER_POINTER (TREE_PURPOSE (v)));
-
- free (cases_seen);
- }
-
- /* Now we go the other way around; we warn if there are case
- expressions that don't correspond to enumerators. This can
- occur since C and C++ don't enforce type-checking of
- assignments to enumeration variables. */
-
- if (case_stack->data.case_stmt.case_list
- && case_stack->data.case_stmt.case_list->left)
- case_stack->data.case_stmt.case_list
- = case_tree2list (case_stack->data.case_stmt.case_list, 0);
- for (n = case_stack->data.case_stmt.case_list; n; n = n->right)
- {
- for (chain = TYPE_VALUES (type);
- chain && !tree_int_cst_equal (n->low, TREE_VALUE (chain));
- chain = TREE_CHAIN (chain))
- ;
-
- if (!chain)
- {
- if (TYPE_NAME (type) == 0)
- warning ("case value `%ld' not in enumerated type",
- (long) TREE_INT_CST_LOW (n->low));
- else
- warning ("case value `%ld' not in enumerated type `%s'",
- (long) TREE_INT_CST_LOW (n->low),
- IDENTIFIER_POINTER ((TREE_CODE (TYPE_NAME (type))
- == IDENTIFIER_NODE)
- ? TYPE_NAME (type)
- : DECL_NAME (TYPE_NAME (type))));
- }
- if (!tree_int_cst_equal (n->low, n->high))
- {
- for (chain = TYPE_VALUES (type);
- chain && !tree_int_cst_equal (n->high, TREE_VALUE (chain));
- chain = TREE_CHAIN (chain))
- ;
-
- if (!chain)
- {
- if (TYPE_NAME (type) == 0)
- warning ("case value `%ld' not in enumerated type",
- (long) TREE_INT_CST_LOW (n->high));
- else
- warning ("case value `%ld' not in enumerated type `%s'",
- (long) TREE_INT_CST_LOW (n->high),
- IDENTIFIER_POINTER ((TREE_CODE (TYPE_NAME (type))
- == IDENTIFIER_NODE)
- ? TYPE_NAME (type)
- : DECL_NAME (TYPE_NAME (type))));
- }
- }
- }
-}
-
-\f
/* Maximum number of case bit tests. */
#define MAX_CASE_BIT_TESTS 3
emit_jump (default_label);
}
+#ifndef HAVE_casesi
+#define HAVE_casesi 0
+#endif
+
+#ifndef HAVE_tablejump
+#define HAVE_tablejump 0
+#endif
+
/* Terminate a case (Pascal) or switch (C) statement
in which ORIG_INDEX is the expression to be tested.
If ORIG_TYPE is not NULL, it is the original ORIG_INDEX
index_expr = thiscase->data.case_stmt.index_expr;
index_type = TREE_TYPE (index_expr);
- unsignedp = TREE_UNSIGNED (index_type);
+ unsignedp = TYPE_UNSIGNED (index_type);
if (orig_type == NULL)
orig_type = TREE_TYPE (orig_index);
/* An ERROR_MARK occurs for various reasons including invalid data type. */
if (index_type != error_mark_node)
{
- /* If the switch expression was an enumerated type, check that
- exactly all enumeration literals are covered by the cases.
- The check is made when -Wswitch was specified and there is no
- default case, or when -Wswitch-enum was specified. */
- if (((warn_switch && !thiscase->data.case_stmt.default_label)
- || warn_switch_enum)
- && TREE_CODE (orig_type) == ENUMERAL_TYPE
- && TREE_CODE (index_expr) != INTEGER_CST)
- check_for_full_enumeration_handling (orig_type);
-
- if (warn_switch_default && !thiscase->data.case_stmt.default_label)
- warning ("switch missing default case");
-
/* If we don't have a default-label, create one here,
after the body of the switch. */
if (thiscase->data.case_stmt.default_label == 0)
because we can optimize it. */
else if (count < case_values_threshold ()
- || compare_tree_int (range, 10 * count) > 0
+ || compare_tree_int (range,
+ (optimize_size ? 3 : 10) * count) > 0
/* RANGE may be signed, and really large ranges will show up
as negative numbers. */
|| compare_tree_int (range, 0) < 0
#ifndef ASM_OUTPUT_ADDR_DIFF_ELT
|| flag_pic
#endif
- || TREE_CONSTANT (index_expr))
+ || TREE_CONSTANT (index_expr)
+ /* If neither casesi or tablejump is available, we can
+ only go this way. */
+ || (!HAVE_casesi && !HAVE_tablejump))
{
index = expand_expr (index_expr, NULL_RTX, VOIDmode, 0);
/* Get table of labels to jump to, in order of case index. */
ncases = tree_low_cst (range, 0) + 1;
- labelvec = (rtx *) alloca (ncases * sizeof (rtx));
- memset ((char *) labelvec, 0, ncases * sizeof (rtx));
+ labelvec = alloca (ncases * sizeof (rtx));
+ memset (labelvec, 0, ncases * sizeof (rtx));
for (n = thiscase->data.case_stmt.case_list; n; n = n->right)
{
static bool
same_case_target_p (rtx l1, rtx l2)
{
+#if 0
rtx i1, i2;
if (l1 == l2)
{
l2 = XEXP (SET_SRC (PATTERN (i2)), 0);
}
+#endif
+ /* When coming from gimple, we usually won't have emitted either
+ the labels or the body of the switch statement. The job being
+ done here should be done via jump threading at the tree level.
+ Cases that go the same place should have the same label. */
return l1 == l2;
}
while (node)
{
- rtx lab = label_rtx (node->code_label);
+ rtx lab;
case_node_ptr np = node;
+ lab = label_rtx (node->code_label);
+
/* Try to group the successors of NODE with NODE. */
while (((np = np->right) != 0)
/* Do they jump to the same place? */
tree index_type)
{
/* If INDEX has an unsigned type, we must make unsigned branches. */
- int unsignedp = TREE_UNSIGNED (index_type);
+ int unsignedp = TYPE_UNSIGNED (index_type);
enum machine_mode mode = GET_MODE (index);
enum machine_mode imode = TYPE_MODE (index_type);
emit_case_nodes (index, node->right, default_label, index_type);
}
+ /* If both children are single-valued cases with no
+ children, finish up all the work. This way, we can save
+ one ordered comparison. */
+ else if (tree_int_cst_equal (node->right->low, node->right->high)
+ && node->right->left == 0
+ && node->right->right == 0
+ && tree_int_cst_equal (node->left->low, node->left->high)
+ && node->left->left == 0
+ && node->left->right == 0)
+ {
+ /* Neither node is bounded. First distinguish the two sides;
+ then emit the code for one side at a time. */
+
+ /* See if the value matches what the right hand side
+ wants. */
+ do_jump_if_equal (index,
+ convert_modes (mode, imode,
+ expand_expr (node->right->low,
+ NULL_RTX,
+ VOIDmode, 0),
+ unsignedp),
+ label_rtx (node->right->code_label),
+ unsignedp);
+
+ /* See if the value matches what the left hand side
+ wants. */
+ do_jump_if_equal (index,
+ convert_modes (mode, imode,
+ expand_expr (node->left->low,
+ NULL_RTX,
+ VOIDmode, 0),
+ unsignedp),
+ label_rtx (node->left->code_label),
+ unsignedp);
+ }
+
else
{
/* Neither node is bounded. First distinguish the two sides;
else if (!low_bound && !high_bound)
{
/* Widen LOW and HIGH to the same width as INDEX. */
- tree type = (*lang_hooks.types.type_for_mode) (mode, unsignedp);
+ tree type = lang_hooks.types.type_for_mode (mode, unsignedp);
tree low = build1 (CONVERT_EXPR, type, node->low);
tree high = build1 (CONVERT_EXPR, type, node->high);
rtx low_rtx, new_index, new_bound;
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