receive_exception_label (handler_label)
rtx handler_label;
{
- rtx around_label = NULL_RTX;
-
- if (! flag_new_exceptions || exceptions_via_longjmp)
- {
- around_label = gen_label_rtx ();
- emit_jump (around_label);
- emit_barrier ();
- }
-
emit_label (handler_label);
- if (! exceptions_via_longjmp)
- {
#ifdef HAVE_exception_receiver
- if (HAVE_exception_receiver)
- emit_insn (gen_exception_receiver ());
- else
+ if (! exceptions_via_longjmp)
+ if (HAVE_exception_receiver)
+ emit_insn (gen_exception_receiver ());
#endif
+
#ifdef HAVE_nonlocal_goto_receiver
- if (HAVE_nonlocal_goto_receiver)
- emit_insn (gen_nonlocal_goto_receiver ());
- else
-#endif
- { /* Nothing */ }
- }
- else
- {
-#ifndef DONT_USE_BUILTIN_SETJMP
- expand_builtin_setjmp_receiver (handler_label);
+ if (! exceptions_via_longjmp)
+ if (HAVE_nonlocal_goto_receiver)
+ emit_insn (gen_nonlocal_goto_receiver ());
#endif
- }
-
- if (around_label)
- emit_label (around_label);
}
+
struct func_eh_entry
{
int range_number; /* EH region number from EH NOTE insn's */
start_dynamic_handler ()
{
rtx dhc, dcc;
- rtx arg, buf;
+ rtx x, arg, buf;
int size;
#ifndef DONT_USE_BUILTIN_SETJMP
buf = plus_constant (XEXP (arg, 0), GET_MODE_SIZE (Pmode)*2);
#ifdef DONT_USE_BUILTIN_SETJMP
+ x = emit_library_call_value (setjmp_libfunc, NULL_RTX, 1, SImode, 1,
+ buf, Pmode);
+ /* If we come back here for a catch, transfer control to the handler. */
+ jumpif_rtx (x, ehstack.top->entry->exception_handler_label);
+#else
{
- rtx x;
- x = emit_library_call_value (setjmp_libfunc, NULL_RTX, LCT_CONST,
- TYPE_MODE (integer_type_node), 1,
- buf, Pmode);
- /* If we come back here for a catch, transfer control to the handler. */
- jumpif_rtx (x, ehstack.top->entry->exception_handler_label);
+ /* A label to continue execution for the no exception case. */
+ rtx noex = gen_label_rtx();
+ x = expand_builtin_setjmp (buf, NULL_RTX, noex,
+ ehstack.top->entry->exception_handler_label);
+ emit_label (noex);
}
-#else
- expand_builtin_setjmp_setup (buf,
- ehstack.top->entry->exception_handler_label);
#endif
/* We are committed to this, so update the handler chain. */
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_setjmp PROTO((tree, 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));
return tem;
}
-/* Construct the leading half of a __builtin_setjmp call. Control will
- return to RECEIVER_LABEL. This is used directly by sjlj exception
- handling code. */
+/* __builtin_setjmp is passed a pointer to an array of five words (not
+ all will be used on all machines). It operates similarly to the C
+ library function of the same name, but is more efficient. Much of
+ the code below (and for longjmp) is copied from the handling of
+ non-local gotos.
-void
-expand_builtin_setjmp_setup (buf_addr, receiver_label)
+ NOTE: This is intended for use by GNAT and the exception handling
+ scheme in the compiler and will only work in the method used by
+ them. */
+
+rtx
+expand_builtin_setjmp (buf_addr, target, first_label, next_label)
rtx buf_addr;
- rtx receiver_label;
+ rtx target;
+ rtx first_label, next_label;
{
+ rtx lab1 = gen_label_rtx ();
enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
+ enum machine_mode value_mode;
rtx stack_save;
+ value_mode = TYPE_MODE (integer_type_node);
+
#ifdef POINTERS_EXTEND_UNSIGNED
buf_addr = convert_memory_address (Pmode, buf_addr);
#endif
buf_addr = force_reg (Pmode, buf_addr);
+ if (target == 0 || GET_CODE (target) != REG
+ || REGNO (target) < FIRST_PSEUDO_REGISTER)
+ target = gen_reg_rtx (value_mode);
+
emit_queue ();
- /* We store the frame pointer and the address of receiver_label in
- the buffer and use the rest of it for the stack save area, which
- is machine-dependent. */
+ /* We store the frame pointer and the address of lab1 in the buffer
+ and use the rest of it for the stack save area, which is
+ machine-dependent. */
#ifndef BUILTIN_SETJMP_FRAME_VALUE
#define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
(gen_rtx_MEM (Pmode,
plus_constant (buf_addr,
GET_MODE_SIZE (Pmode)))),
- force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
+ force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1)));
stack_save = gen_rtx_MEM (sa_mode,
plus_constant (buf_addr,
emit_insn (gen_builtin_setjmp_setup (buf_addr));
#endif
- /* Tell optimize_save_area_alloca that extra work is going to
- need to go on during alloca. */
- current_function_calls_setjmp = 1;
+ /* Set TARGET to zero and branch to the first-time-through label. */
+ emit_move_insn (target, const0_rtx);
+ emit_jump_insn (gen_jump (first_label));
+ emit_barrier ();
+ emit_label (lab1);
+
+ /* Tell flow about the strange goings on. Putting `lab1' on
+ `nonlocal_goto_handler_labels' to indicates that function
+ calls may traverse the arc back to this label. */
- /* Set this so all the registers get saved in our frame; we need to be
- able to copy the saved values for any registers from frames we unwind. */
current_function_has_nonlocal_label = 1;
-}
+ nonlocal_goto_handler_labels =
+ gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels);
-/* Construct the trailing part of a __builtin_setjmp call.
- This is used directly by sjlj exception handling code. */
-
-void
-expand_builtin_setjmp_receiver (receiver_label)
- rtx receiver_label ATTRIBUTE_UNUSED;
-{
/* 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));
#ifdef HAVE_builtin_setjmp_receiver
if (HAVE_builtin_setjmp_receiver)
- emit_insn (gen_builtin_setjmp_receiver (receiver_label));
+ emit_insn (gen_builtin_setjmp_receiver (lab1));
else
#endif
#ifdef HAVE_nonlocal_goto_receiver
; /* Nothing */
}
- /* @@@ 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, ""));
-}
-
-
-/* __builtin_setjmp is passed a pointer to an array of five words (not
- all will be used on all machines). It operates similarly to the C
- library function of the same name, but is more efficient. Much of
- the code below (and for longjmp) is copied from the handling of
- non-local gotos.
-
- NOTE: This is intended for use by GNAT and the exception handling
- scheme in the compiler and will only work in the method used by
- them. */
-
-static rtx
-expand_builtin_setjmp (arglist, target)
- tree arglist;
- rtx target;
-{
- rtx buf_addr, next_lab, cont_lab;
-
- if (arglist == 0
- || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
- return NULL_RTX;
-
- if (target == 0 || GET_CODE (target) != REG
- || REGNO (target) < FIRST_PSEUDO_REGISTER)
- target = gen_reg_rtx (TYPE_MODE (integer_type_node));
-
- buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
-
- next_lab = gen_label_rtx ();
- cont_lab = gen_label_rtx ();
-
- expand_builtin_setjmp_setup (buf_addr, next_lab);
-
- /* Set TARGET to zero and branch to the continue label. */
- emit_move_insn (target, const0_rtx);
- emit_jump_insn (gen_jump (cont_lab));
- emit_barrier ();
- emit_label (next_lab);
-
- expand_builtin_setjmp_receiver (next_lab);
-
- /* Set TARGET to one. */
+ /* Set TARGET, and branch to the next-time-through label. */
emit_move_insn (target, const1_rtx);
- emit_label (cont_lab);
-
- /* Tell flow about the strange goings on. Putting `next_lab' on
- `nonlocal_goto_handler_labels' to indicates that function
- calls may traverse the arc back to this label. */
+ emit_jump_insn (gen_jump (next_label));
+ emit_barrier ();
- current_function_has_nonlocal_label = 1;
- nonlocal_goto_handler_labels
- = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
-
return target;
}
#endif
case BUILT_IN_SETJMP:
- target = expand_builtin_setjmp (arglist, target);
- if (target)
- return target;
- break;
+ if (arglist == 0
+ || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
+ break;
+ else
+ {
+ rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
+ VOIDmode, 0);
+ rtx lab = gen_label_rtx ();
+ rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab);
+ emit_label (lab);
+ return ret;
+ }
/* __builtin_longjmp is passed a pointer to an array of five words.
It's similar to the C library longjmp function but works with
projects / thirdparty / gcc.git / commitdiff
