function calls being expanded by expand_call. */
tree cleanups_this_call;
+/* Similarly for __builtin_apply_args. */
+static rtx apply_args_value;
+
/* Nonzero means __builtin_saveregs has already been done in this function.
The value is the pseudoreg containing the value __builtin_saveregs
returned. */
static tree string_constant PROTO((tree, tree *));
static tree c_strlen PROTO((tree));
static rtx expand_builtin PROTO((tree, rtx, rtx, enum machine_mode, int));
+static int apply_args_size PROTO((void));
+static int apply_result_size PROTO((void));
+static rtx result_vector PROTO((int, rtx));
+static rtx expand_builtin_apply_args PROTO((void));
+static rtx expand_builtin_apply PROTO((rtx, rtx, rtx));
+static void expand_builtin_return PROTO((rtx));
static rtx expand_increment PROTO((tree, int));
static void preexpand_calls PROTO((tree));
static void do_jump_by_parts_greater PROTO((tree, int, rtx, rtx));
#ifndef SLOW_UNALIGNED_ACCESS
#define SLOW_UNALIGNED_ACCESS 0
#endif
+
+/* Register mappings for target machines without register windows. */
+#ifndef INCOMING_REGNO
+#define INCOMING_REGNO(OUT) (OUT)
+#endif
+#ifndef OUTGOING_REGNO
+#define OUTGOING_REGNO(IN) (IN)
+#endif
\f
/* This is run once per compilation to set up which modes can be used
directly in memory and to initialize the block move optab. */
inhibit_defer_pop = 0;
cleanups_this_call = 0;
saveregs_value = 0;
+ apply_args_value = 0;
forced_labels = 0;
}
p->inhibit_defer_pop = inhibit_defer_pop;
p->cleanups_this_call = cleanups_this_call;
p->saveregs_value = saveregs_value;
+ p->apply_args_value = apply_args_value;
p->forced_labels = forced_labels;
pending_stack_adjust = 0;
inhibit_defer_pop = 0;
cleanups_this_call = 0;
saveregs_value = 0;
+ apply_args_value = 0;
forced_labels = 0;
}
inhibit_defer_pop = p->inhibit_defer_pop;
cleanups_this_call = p->cleanups_this_call;
saveregs_value = p->saveregs_value;
+ apply_args_value = p->apply_args_value;
forced_labels = p->forced_labels;
}
\f
return target;
+ /* __builtin_apply_args returns block of memory allocated on
+ the stack into which is stored the arg pointer, structure
+ value address, static chain, and all the registers that might
+ possibly be used in performing a function call. The code is
+ moved to the start of the function so the incoming values are
+ saved. */
+ case BUILT_IN_APPLY_ARGS:
+ /* Don't do __builtin_apply_args more than once in a function.
+ Save the result of the first call and reuse it. */
+ if (apply_args_value != 0)
+ return apply_args_value;
+ {
+ /* When this function is called, it means that registers must be
+ saved on entry to this function. So we migrate the
+ call to the first insn of this function. */
+ rtx temp;
+ rtx seq;
+
+ start_sequence ();
+ temp = expand_builtin_apply_args ();
+ seq = get_insns ();
+ end_sequence ();
+
+ apply_args_value = temp;
+
+ /* Put the sequence after the NOTE that starts the function.
+ If this is inside a SEQUENCE, make the outer-level insn
+ chain current, so the code is placed at the start of the
+ function. */
+ push_topmost_sequence ();
+ emit_insns_before (seq, NEXT_INSN (get_insns ()));
+ pop_topmost_sequence ();
+ return temp;
+ }
+
+ /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
+ FUNCTION with a copy of the parameters described by
+ ARGUMENTS, and ARGSIZE. It returns a block of memory
+ allocated on the stack into which is stored all the registers
+ that might possibly be used for returning the result of a
+ function. ARGUMENTS is the value returned by
+ __builtin_apply_args. ARGSIZE is the number of bytes of
+ arguments that must be copied. ??? How should this value be
+ computed? We'll also need a safe worst case value for varargs
+ functions. */
+ case BUILT_IN_APPLY:
+ if (arglist == 0
+ /* Arg could be non-pointer if user redeclared this fcn wrong. */
+ || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
+ || TREE_CHAIN (arglist) == 0
+ || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
+ || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
+ || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
+ return const0_rtx;
+ else
+ {
+ int i;
+ tree t;
+ rtx ops[3];
+
+ for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
+ ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
+
+ return expand_builtin_apply (ops[0], ops[1], ops[2]);
+ }
+
+ /* __builtin_return (RESULT) causes the function to return the
+ value described by RESULT. RESULT is address of the block of
+ memory returned by __builtin_apply. */
+ case BUILT_IN_RETURN:
+ if (arglist
+ /* Arg could be non-pointer if user redeclared this fcn wrong. */
+ && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE)
+ expand_builtin_return (expand_expr (TREE_VALUE (arglist),
+ NULL_RTX, VOIDmode, 0));
+ return const0_rtx;
+
case BUILT_IN_SAVEREGS:
/* Don't do __builtin_saveregs more than once in a function.
Save the result of the first call and reuse it. */
saveregs_value = temp;
- /* This won't work inside a SEQUENCE--it really has to be
- at the start of the function. */
- if (in_sequence_p ())
- {
- /* Better to do this than to crash. */
- error ("`va_start' used within `({...})'");
- return temp;
- }
-
- /* Put the sequence after the NOTE that starts the function. */
+ /* Put the sequence after the NOTE that starts the function.
+ If this is inside a SEQUENCE, make the outer-level insn
+ chain current, so the code is placed at the start of the
+ function. */
+ push_topmost_sequence ();
emit_insns_before (seq, NEXT_INSN (get_insns ()));
+ pop_topmost_sequence ();
return temp;
}
return expand_call (exp, target, ignore);
}
\f
+/* Built-in functions to perform an untyped call and return. */
+
+/* For each register that may be used for calling a function, this
+ gives a mode used to copy the register's value. VOIDmode indicates
+ the register is not used for calling a function. If the machine
+ has register windows, this gives only the outbound registers.
+ INCOMING_REGNO gives the corresponding inbound register. */
+static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
+
+/* For each register that may be used for returning values, this gives
+ a mode used to copy the register's value. VOIDmode indicates the
+ register is not used for returning values. If the machine has
+ register windows, this gives only the outbound registers.
+ INCOMING_REGNO gives the corresponding inbound register. */
+static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
+
+/* Return the size required for the block returned by __builtin_apply_args,
+ and initialize apply_args_mode. */
+static int
+apply_args_size ()
+{
+ static int size = -1;
+ int align, regno;
+ enum machine_mode mode;
+
+ /* The values computed by this function never change. */
+ if (size < 0)
+ {
+ /* The first value is the incoming arg-pointer. */
+ size = GET_MODE_SIZE (Pmode);
+
+ /* The second value is the structure value address unless this is
+ passed as an "invisible" first argument. */
+ if (struct_value_rtx)
+ size += GET_MODE_SIZE (Pmode);
+
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if (FUNCTION_ARG_REGNO_P (regno))
+ {
+ /* Search for the proper mode for copying this register's
+ value. I'm not sure this is right, but it works so far. */
+ enum machine_mode best_mode = VOIDmode;
+
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+ mode != VOIDmode;
+ mode = GET_MODE_WIDER_MODE (mode))
+ if (HARD_REGNO_MODE_OK (regno, mode)
+ && HARD_REGNO_NREGS (regno, mode) == 1)
+ best_mode = mode;
+
+ if (best_mode == VOIDmode)
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
+ mode != VOIDmode;
+ mode = GET_MODE_WIDER_MODE (mode))
+ if (HARD_REGNO_MODE_OK (regno, mode)
+ && (mov_optab->handlers[(int) mode].insn_code
+ != CODE_FOR_nothing))
+ best_mode = mode;
+
+ mode = best_mode;
+ if (mode == VOIDmode)
+ abort ();
+
+ align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
+ if (size % align != 0)
+ size = CEIL (size, align) * align;
+ size += GET_MODE_SIZE (mode);
+ apply_args_mode[regno] = mode;
+ }
+ else
+ apply_args_mode[regno] = VOIDmode;
+ }
+ return size;
+}
+
+/* Return the size required for the block returned by __builtin_apply,
+ and initialize apply_result_mode. */
+static int
+apply_result_size ()
+{
+ static int size = -1;
+ int align, regno;
+ enum machine_mode mode;
+
+ /* The values computed by this function never change. */
+ if (size < 0)
+ {
+ size = 0;
+
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if (FUNCTION_VALUE_REGNO_P (regno))
+ {
+ /* Search for the proper mode for copying this register's
+ value. I'm not sure this is right, but it works so far. */
+ enum machine_mode best_mode = VOIDmode;
+
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+ mode != TImode;
+ mode = GET_MODE_WIDER_MODE (mode))
+ if (HARD_REGNO_MODE_OK (regno, mode))
+ best_mode = mode;
+
+ if (best_mode == VOIDmode)
+ for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
+ mode != VOIDmode;
+ mode = GET_MODE_WIDER_MODE (mode))
+ if (HARD_REGNO_MODE_OK (regno, mode)
+ && (mov_optab->handlers[(int) mode].insn_code
+ != CODE_FOR_nothing))
+ best_mode = mode;
+
+ mode = best_mode;
+ if (mode == VOIDmode)
+ abort ();
+
+ align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
+ if (size % align != 0)
+ size = CEIL (size, align) * align;
+ size += GET_MODE_SIZE (mode);
+ apply_result_mode[regno] = mode;
+ }
+ else
+ apply_result_mode[regno] = VOIDmode;
+
+ /* Allow targets that use untyped_call and untyped_return to override
+ the size so that machine-specific information can be stored here. */
+#ifdef APPLY_RESULT_SIZE
+ size = APPLY_RESULT_SIZE;
+#endif
+ }
+ return size;
+}
+
+#if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
+/* Create a vector describing the result block RESULT. If SAVEP is true,
+ the result block is used to save the values; otherwise it is used to
+ restore the values. */
+static rtx
+result_vector (savep, result)
+ int savep;
+ rtx result;
+{
+ int regno, size, align, nelts;
+ enum machine_mode mode;
+ rtx reg, mem;
+ rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
+
+ size = nelts = 0;
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if ((mode = apply_result_mode[regno]) != VOIDmode)
+ {
+ align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
+ if (size % align != 0)
+ size = CEIL (size, align) * align;
+ reg = gen_rtx (REG, mode, savep ? INCOMING_REGNO (regno) : regno);
+ mem = change_address (result, mode,
+ plus_constant (XEXP (result, 0), size));
+ savevec[nelts++] = (savep
+ ? gen_rtx (SET, VOIDmode, mem, reg)
+ : gen_rtx (SET, VOIDmode, reg, mem));
+ size += GET_MODE_SIZE (mode);
+ }
+ return gen_rtx (PARALLEL, VOIDmode, gen_rtvec_v (nelts, savevec));
+}
+#endif /* HAVE_untyped_call or HAVE_untyped_return */
+
+
+/* Save the state required to perform an untyped call with the same
+ arguments as were passed to the current function. */
+static rtx
+expand_builtin_apply_args ()
+{
+ rtx registers;
+ int size, align, regno;
+ enum machine_mode mode;
+
+ /* Create a block where the arg-pointer, structure value address,
+ and argument registers can be saved. */
+ registers = assign_stack_local (BLKmode, apply_args_size (), -1);
+
+ /* Walk past the arg-pointer and structure value address. */
+ size = GET_MODE_SIZE (Pmode);
+ if (struct_value_rtx)
+ size += GET_MODE_SIZE (Pmode);
+
+ /* Save each register used in calling a function to the block. */
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if ((mode = apply_args_mode[regno]) != VOIDmode)
+ {
+ align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
+ if (size % align != 0)
+ size = CEIL (size, align) * align;
+ emit_move_insn (change_address (registers, mode,
+ plus_constant (XEXP (registers, 0),
+ size)),
+ gen_rtx (REG, mode, INCOMING_REGNO (regno)));
+ size += GET_MODE_SIZE (mode);
+ }
+
+ /* Save the arg pointer to the block. */
+ emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
+ copy_to_reg (virtual_incoming_args_rtx));
+ size = GET_MODE_SIZE (Pmode);
+
+ /* Save the structure value address unless this is passed as an
+ "invisible" first argument. */
+ if (struct_value_incoming_rtx)
+ {
+ emit_move_insn (change_address (registers, Pmode,
+ plus_constant (XEXP (registers, 0),
+ size)),
+ copy_to_reg (struct_value_incoming_rtx));
+ size += GET_MODE_SIZE (Pmode);
+ }
+
+ /* Return the address of the block. */
+ return copy_addr_to_reg (XEXP (registers, 0));
+}
+
+/* Perform an untyped call and save the state required to perform an
+ untyped return of whatever value was returned by the given function. */
+static rtx
+expand_builtin_apply (function, arguments, argsize)
+ rtx function, arguments, argsize;
+{
+ int size, align, regno;
+ enum machine_mode mode;
+ rtx incoming_args, result, reg, dest, call_insn;
+ rtx old_stack_level = 0;
+ rtx use_insns = 0;
+
+ /* Create a block where the return registers can be saved. */
+ result = assign_stack_local (BLKmode, apply_result_size (), -1);
+
+ /* ??? The argsize value should be adjusted here. */
+
+ /* Fetch the arg pointer from the ARGUMENTS block. */
+ incoming_args = gen_reg_rtx (Pmode);
+ emit_move_insn (incoming_args,
+ gen_rtx (MEM, Pmode, arguments));
+#ifndef STACK_GROWS_DOWNWARD
+ incoming_args = expand_binop (Pmode, add_optab, incoming_args, argsize,
+ incoming_args, 0, OPTAB_LIB_WIDEN);
+#endif
+
+ /* Perform postincrements before actually calling the function. */
+ emit_queue ();
+
+ /* Push a new argument block and copy the arguments. */
+ do_pending_stack_adjust ();
+ emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
+
+ /* Push a block of memory onto the stack to store the memory arguments.
+ Save the address in a register, and copy the memory arguments. ??? I
+ haven't figured out how the calling convention macros effect this,
+ but it's likely that the source and/or destination addresses in
+ the block copy will need updating in machine specific ways. */
+ dest = copy_addr_to_reg (push_block (argsize, 0, 0));
+ emit_block_move (gen_rtx (MEM, BLKmode, dest),
+ gen_rtx (MEM, BLKmode, incoming_args),
+ argsize,
+ PARM_BOUNDARY / BITS_PER_UNIT);
+
+ /* Refer to the argument block. */
+ apply_args_size ();
+ arguments = gen_rtx (MEM, BLKmode, arguments);
+
+ /* Walk past the arg-pointer and structure value address. */
+ size = GET_MODE_SIZE (Pmode);
+ if (struct_value_rtx)
+ size += GET_MODE_SIZE (Pmode);
+
+ /* Restore each of the registers previously saved. Make USE insns
+ for each of these registers for use in making the call. */
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if ((mode = apply_args_mode[regno]) != VOIDmode)
+ {
+ align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
+ if (size % align != 0)
+ size = CEIL (size, align) * align;
+ reg = gen_rtx (REG, mode, regno);
+ emit_move_insn (reg,
+ change_address (arguments, mode,
+ plus_constant (XEXP (arguments, 0),
+ size)));
+
+ push_to_sequence (use_insns);
+ emit_insn (gen_rtx (USE, VOIDmode, reg));
+ use_insns = get_insns ();
+ end_sequence ();
+ size += GET_MODE_SIZE (mode);
+ }
+
+ /* Restore the structure value address unless this is passed as an
+ "invisible" first argument. */
+ size = GET_MODE_SIZE (Pmode);
+ if (struct_value_rtx)
+ {
+ rtx value = gen_reg_rtx (Pmode);
+ emit_move_insn (value,
+ change_address (arguments, Pmode,
+ plus_constant (XEXP (arguments, 0),
+ size)));
+ emit_move_insn (struct_value_rtx, value);
+ if (GET_CODE (struct_value_rtx) == REG)
+ {
+ push_to_sequence (use_insns);
+ emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx));
+ use_insns = get_insns ();
+ end_sequence ();
+ }
+ size += GET_MODE_SIZE (Pmode);
+ }
+
+ /* All arguments and registers used for the call are set up by now! */
+ function = prepare_call_address (function, NULL_TREE, &use_insns);
+
+ /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
+ and we don't want to load it into a register as an optimization,
+ because prepare_call_address already did it if it should be done. */
+ if (GET_CODE (function) != SYMBOL_REF)
+ function = memory_address (FUNCTION_MODE, function);
+
+ /* Generate the actual call instruction and save the return value. */
+#ifdef HAVE_untyped_call
+ if (HAVE_untyped_call)
+ emit_call_insn (gen_untyped_call (gen_rtx (MEM, FUNCTION_MODE, function),
+ result, result_vector (1, result)));
+ else
+#endif
+#ifdef HAVE_call_value
+ if (HAVE_call_value)
+ {
+ rtx valreg = 0;
+
+ /* Locate the unique return register. It is not possible to
+ express a call that sets more than one return register using
+ call_value; use untyped_call for that. In fact, untyped_call
+ only needs to save the return registers in the given block. */
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if ((mode = apply_result_mode[regno]) != VOIDmode)
+ {
+ if (valreg)
+ abort (); /* HAVE_untyped_call required. */
+ valreg = gen_rtx (REG, mode, regno);
+ }
+
+ emit_call_insn (gen_call_value (valreg,
+ gen_rtx (MEM, FUNCTION_MODE, function),
+ const0_rtx, NULL_RTX, const0_rtx));
+
+ emit_move_insn (change_address (result, GET_MODE (valreg),
+ XEXP (result, 0)),
+ valreg);
+ }
+ else
+#endif
+ abort ();
+
+ /* Find the CALL insn we just emitted and write the USE insns before it. */
+ for (call_insn = get_last_insn ();
+ call_insn && GET_CODE (call_insn) != CALL_INSN;
+ call_insn = PREV_INSN (call_insn))
+ ;
+
+ if (! call_insn)
+ abort ();
+
+ /* Put the USE insns before the CALL. */
+ emit_insns_before (use_insns, call_insn);
+
+ /* Restore the stack. */
+ emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
+
+ /* Return the address of the result block. */
+ return copy_addr_to_reg (XEXP (result, 0));
+}
+
+/* Perform an untyped return. */
+static void
+expand_builtin_return (result)
+ rtx result;
+{
+ int size, align, regno;
+ enum machine_mode mode;
+ rtx reg;
+ rtx use_insns = 0;
+
+ apply_result_size ();
+ result = gen_rtx (MEM, BLKmode, result);
+
+#ifdef HAVE_untyped_return
+ if (HAVE_untyped_return)
+ {
+ emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
+ emit_barrier ();
+ return;
+ }
+#endif
+
+ /* Restore the return value and note that each value is used. */
+ size = 0;
+ for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if ((mode = apply_result_mode[regno]) != VOIDmode)
+ {
+ align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
+ if (size % align != 0)
+ size = CEIL (size, align) * align;
+ reg = gen_rtx (REG, mode, INCOMING_REGNO (regno));
+ emit_move_insn (reg,
+ change_address (result, mode,
+ plus_constant (XEXP (result, 0),
+ size)));
+
+ push_to_sequence (use_insns);
+ emit_insn (gen_rtx (USE, VOIDmode, reg));
+ use_insns = get_insns ();
+ end_sequence ();
+ size += GET_MODE_SIZE (mode);
+ }
+
+ /* Put the USE insns before the return. */
+ emit_insns (use_insns);
+
+ /* Return whatever values was restored by jumping directly to the end
+ of the function. */
+ expand_null_return ();
+}
+\f
/* Expand code for a post- or pre- increment or decrement
and return the RTX for the result.
POST is 1 for postinc/decrements and 0 for preinc/decrements. */
OSDN Git Service
