2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Backend ABI implementation.
23 * @author Sebastian Hack, Michael Beck
33 #include "irgraph_t.h"
36 #include "iredges_t.h"
39 #include "irprintf_t.h"
45 #include "raw_bitset.h"
54 #include "besched_t.h"
56 #include "bessaconstr.h"
58 typedef struct _be_abi_call_arg_t {
59 unsigned is_res : 1; /**< 1: the call argument is a return value. 0: it's a call parameter. */
60 unsigned in_reg : 1; /**< 1: this argument is transmitted in registers. */
61 unsigned on_stack : 1; /**< 1: this argument is transmitted on the stack. */
64 const arch_register_t *reg;
67 unsigned alignment; /**< stack alignment */
68 unsigned space_before; /**< allocate space before */
69 unsigned space_after; /**< allocate space after */
72 struct _be_abi_call_t {
73 be_abi_call_flags_t flags; /**< Flags describing the ABI behavior on calls */
74 int pop; /**< number of bytes the stack frame is shrinked by the callee on return. */
75 const be_abi_callbacks_t *cb;
76 ir_type *between_type;
78 const arch_register_class_t *cls_addr; /**< register class of the call address */
82 * The ABI information for the current birg.
84 struct _be_abi_irg_t {
86 be_irg_t *birg; /**< The back end IRG. */
87 const arch_env_t *arch_env;
88 survive_dce_t *dce_survivor;
90 be_abi_call_t *call; /**< The ABI call information. */
91 ir_type *method_type; /**< The type of the method of the IRG. */
93 ir_node *init_sp; /**< The node representing the stack pointer
94 at the start of the function. */
96 ir_node *reg_params; /**< The reg params node. */
97 pmap *regs; /**< A map of all callee-save and ignore regs to
98 their Projs to the RegParams node. */
100 int start_block_bias; /**< The stack bias at the end of the start block. */
102 void *cb; /**< ABI Callback self pointer. */
104 pmap *keep_map; /**< mapping blocks to keep nodes. */
105 pset *ignore_regs; /**< Additional registers which shall be ignored. */
107 ir_node **calls; /**< flexible array containing all be_Call nodes */
109 arch_register_req_t sp_req;
110 arch_register_req_t sp_cls_req;
112 be_stack_layout_t frame; /**< The stack frame model. */
114 DEBUG_ONLY(firm_dbg_module_t *dbg;) /**< The debugging module. */
117 static heights_t *ir_heights;
119 /** Flag: if set, try to omit the frame pointer in all routines. */
120 static int be_omit_fp = 1;
122 /** Flag: if set, try to omit the frame pointer in leaf routines only. */
123 static int be_omit_leaf_fp = 1;
126 _ ____ ___ ____ _ _ _ _
127 / \ | __ )_ _| / ___|__ _| | | |__ __ _ ___| | _____
128 / _ \ | _ \| | | | / _` | | | '_ \ / _` |/ __| |/ / __|
129 / ___ \| |_) | | | |__| (_| | | | |_) | (_| | (__| <\__ \
130 /_/ \_\____/___| \____\__,_|_|_|_.__/ \__,_|\___|_|\_\___/
132 These callbacks are used by the backend to set the parameters
133 for a specific call type.
137 * Set compare function: compares two ABI call object arguments.
139 static int cmp_call_arg(const void *a, const void *b, size_t n)
141 const be_abi_call_arg_t *p = a, *q = b;
143 return !(p->is_res == q->is_res && p->pos == q->pos);
147 * Get an ABI call object argument.
149 * @param call the abi call
150 * @param is_res true for call results, false for call arguments
151 * @param pos position of the argument
153 static be_abi_call_arg_t *get_call_arg(be_abi_call_t *call, int is_res, int pos)
155 be_abi_call_arg_t arg;
158 memset(&arg, 0, sizeof(arg));
162 hash = is_res * 128 + pos;
164 return set_find(call->params, &arg, sizeof(arg), hash);
168 * Set an ABI call object argument.
170 * @param call the abi call
171 * @param is_res true for call results, false for call arguments
172 * @param pos position of the argument
174 static be_abi_call_arg_t *create_call_arg(be_abi_call_t *call, int is_res, int pos)
176 be_abi_call_arg_t arg;
179 memset(&arg, 0, sizeof(arg));
183 hash = is_res * 128 + pos;
185 return set_insert(call->params, &arg, sizeof(arg), hash);
188 /* Set the flags for a call. */
189 void be_abi_call_set_flags(be_abi_call_t *call, be_abi_call_flags_t flags, const be_abi_callbacks_t *cb)
195 /* Sets the number of bytes the stackframe is shrinked by the callee on return */
196 void be_abi_call_set_pop(be_abi_call_t *call, int pop)
202 /* Set register class for call address */
203 void be_abi_call_set_call_address_reg_class(be_abi_call_t *call, const arch_register_class_t *cls)
205 call->cls_addr = cls;
209 void be_abi_call_param_stack(be_abi_call_t *call, int arg_pos, ir_mode *load_mode, unsigned alignment, unsigned space_before, unsigned space_after)
211 be_abi_call_arg_t *arg = create_call_arg(call, 0, arg_pos);
213 arg->load_mode = load_mode;
214 arg->alignment = alignment;
215 arg->space_before = space_before;
216 arg->space_after = space_after;
217 assert(alignment > 0 && "Alignment must be greater than 0");
220 void be_abi_call_param_reg(be_abi_call_t *call, int arg_pos, const arch_register_t *reg)
222 be_abi_call_arg_t *arg = create_call_arg(call, 0, arg_pos);
227 void be_abi_call_res_reg(be_abi_call_t *call, int arg_pos, const arch_register_t *reg)
229 be_abi_call_arg_t *arg = create_call_arg(call, 1, arg_pos);
234 /* Get the flags of a ABI call object. */
235 be_abi_call_flags_t be_abi_call_get_flags(const be_abi_call_t *call)
241 * Constructor for a new ABI call object.
243 * @param cls_addr register class of the call address
245 * @return the new ABI call object
247 static be_abi_call_t *be_abi_call_new(const arch_register_class_t *cls_addr)
249 be_abi_call_t *call = XMALLOCZ(be_abi_call_t);
252 call->params = new_set(cmp_call_arg, 16);
254 call->cls_addr = cls_addr;
256 call->flags.bits.try_omit_fp = be_omit_fp | be_omit_leaf_fp;
262 * Destructor for an ABI call object.
264 static void be_abi_call_free(be_abi_call_t *call)
266 del_set(call->params);
272 | ___| __ __ _ _ __ ___ ___ | | | | __ _ _ __ __| | (_)_ __ __ _
273 | |_ | '__/ _` | '_ ` _ \ / _ \ | |_| |/ _` | '_ \ / _` | | | '_ \ / _` |
274 | _|| | | (_| | | | | | | __/ | _ | (_| | | | | (_| | | | | | | (_| |
275 |_| |_| \__,_|_| |_| |_|\___| |_| |_|\__,_|_| |_|\__,_|_|_|_| |_|\__, |
278 Handling of the stack frame. It is composed of three types:
279 1) The type of the arguments which are pushed on the stack.
280 2) The "between type" which consists of stuff the call of the
281 function pushes on the stack (like the return address and
282 the old base pointer for ia32).
283 3) The Firm frame type which consists of all local variables
287 static int get_stack_entity_offset(be_stack_layout_t *frame, ir_entity *ent,
290 ir_type *t = get_entity_owner(ent);
291 int ofs = get_entity_offset(ent);
295 /* Find the type the entity is contained in. */
296 for (index = 0; index < N_FRAME_TYPES; ++index) {
297 if (frame->order[index] == t)
299 /* Add the size of all the types below the one of the entity to the entity's offset */
300 ofs += get_type_size_bytes(frame->order[index]);
303 /* correct the offset by the initial position of the frame pointer */
304 ofs -= frame->initial_offset;
306 /* correct the offset with the current bias. */
313 * Retrieve the entity with given offset from a frame type.
315 static ir_entity *search_ent_with_offset(ir_type *t, int offset)
319 for (i = 0, n = get_compound_n_members(t); i < n; ++i) {
320 ir_entity *ent = get_compound_member(t, i);
321 if (get_entity_offset(ent) == offset)
328 static int stack_frame_compute_initial_offset(be_stack_layout_t *frame)
330 ir_type *base = frame->stack_dir < 0 ? frame->between_type : frame->frame_type;
331 ir_entity *ent = search_ent_with_offset(base, 0);
333 frame->initial_offset = ent ? get_stack_entity_offset(frame, ent, 0) : 0;
335 return frame->initial_offset;
339 * Initializes the frame layout from parts
341 * @param frame the stack layout that will be initialized
342 * @param args the stack argument layout type
343 * @param between the between layout type
344 * @param locals the method frame type
345 * @param stack_dir the stack direction
346 * @param param_map an array mapping method argument positions to the stack argument type
348 * @return the initialized stack layout
350 static be_stack_layout_t *stack_frame_init(be_stack_layout_t *frame, ir_type *args,
351 ir_type *between, ir_type *locals, int stack_dir,
352 ir_entity *param_map[])
354 frame->arg_type = args;
355 frame->between_type = between;
356 frame->frame_type = locals;
357 frame->initial_offset = 0;
358 frame->initial_bias = 0;
359 frame->stack_dir = stack_dir;
360 frame->order[1] = between;
361 frame->param_map = param_map;
364 frame->order[0] = args;
365 frame->order[2] = locals;
368 frame->order[0] = locals;
369 frame->order[2] = args;
375 /** Dumps the stack layout to file. */
376 static void stack_layout_dump(FILE *file, be_stack_layout_t *frame)
380 ir_fprintf(file, "initial offset: %d\n", frame->initial_offset);
381 for (j = 0; j < N_FRAME_TYPES; ++j) {
382 ir_type *t = frame->order[j];
384 ir_fprintf(file, "type %d: %F size: %d\n", j, t, get_type_size_bytes(t));
385 for (i = 0, n = get_compound_n_members(t); i < n; ++i) {
386 ir_entity *ent = get_compound_member(t, i);
387 ir_fprintf(file, "\t%F int ofs: %d glob ofs: %d\n", ent, get_entity_offset_bytes(ent), get_stack_entity_offset(frame, ent, 0));
394 * Returns non-zero if the call argument at given position
395 * is transfered on the stack.
397 static inline int is_on_stack(be_abi_call_t *call, int pos)
399 be_abi_call_arg_t *arg = get_call_arg(call, 0, pos);
400 return arg && !arg->in_reg;
410 Adjustment of the calls inside a graph.
415 * Transform a call node into a be_Call node.
417 * @param env The ABI environment for the current irg.
418 * @param irn The call node.
419 * @param curr_sp The stack pointer node to use.
420 * @return The stack pointer after the call.
422 static ir_node *adjust_call(be_abi_irg_t *env, ir_node *irn, ir_node *curr_sp)
424 ir_graph *irg = env->birg->irg;
425 const arch_env_t *arch_env = env->birg->main_env->arch_env;
426 ir_type *call_tp = get_Call_type(irn);
427 ir_node *call_ptr = get_Call_ptr(irn);
428 int n_params = get_method_n_params(call_tp);
429 ir_node *curr_mem = get_Call_mem(irn);
430 ir_node *bl = get_nodes_block(irn);
432 int stack_dir = arch_env_stack_dir(arch_env);
433 const arch_register_t *sp = arch_env_sp(arch_env);
434 be_abi_call_t *call = be_abi_call_new(sp->reg_class);
435 ir_mode *mach_mode = sp->reg_class->mode;
436 struct obstack *obst = &env->obst;
437 int no_alloc = call->flags.bits.frame_is_setup_on_call;
438 int n_res = get_method_n_ress(call_tp);
439 int do_seq = call->flags.bits.store_args_sequential && !no_alloc;
441 ir_node *res_proj = NULL;
442 int n_reg_params = 0;
443 int n_stack_params = 0;
446 pset_new_t destroyed_regs, states;
447 pset_new_iterator_t iter;
451 int n_reg_results = 0;
452 const arch_register_t *reg;
453 const ir_edge_t *edge;
455 int *stack_param_idx;
456 int i, n, destroy_all_regs;
459 pset_new_init(&destroyed_regs);
460 pset_new_init(&states);
462 /* Let the isa fill out the abi description for that call node. */
463 arch_env_get_call_abi(arch_env, call_tp, call);
465 /* Insert code to put the stack arguments on the stack. */
466 assert(get_Call_n_params(irn) == n_params);
467 for (i = 0; i < n_params; ++i) {
468 be_abi_call_arg_t *arg = get_call_arg(call, 0, i);
471 int arg_size = get_type_size_bytes(get_method_param_type(call_tp, i));
473 stack_size += round_up2(arg->space_before, arg->alignment);
474 stack_size += round_up2(arg_size, arg->alignment);
475 stack_size += round_up2(arg->space_after, arg->alignment);
476 obstack_int_grow(obst, i);
480 stack_param_idx = obstack_finish(obst);
482 /* Collect all arguments which are passed in registers. */
483 for (i = 0; i < n_params; ++i) {
484 be_abi_call_arg_t *arg = get_call_arg(call, 0, i);
485 if (arg && arg->in_reg) {
486 obstack_int_grow(obst, i);
490 reg_param_idxs = obstack_finish(obst);
493 * If the stack is decreasing and we do not want to store sequentially,
494 * or someone else allocated the call frame
495 * we allocate as much space on the stack all parameters need, by
496 * moving the stack pointer along the stack's direction.
498 * Note: we also have to do this for stack_size == 0, because we may have
499 * to adjust stack alignment for the call.
501 if (stack_dir < 0 && !do_seq && !no_alloc) {
502 curr_sp = be_new_IncSP(sp, irg, bl, curr_sp, stack_size, 1);
505 dbgi = get_irn_dbg_info(irn);
506 /* If there are some parameters which shall be passed on the stack. */
507 if (n_stack_params > 0) {
511 * Reverse list of stack parameters if call arguments are from left to right.
512 * We must them reverse again if they are pushed (not stored) and the stack
513 * direction is downwards.
515 if (call->flags.bits.left_to_right ^ (do_seq && stack_dir < 0)) {
516 for (i = 0; i < n_stack_params >> 1; ++i) {
517 int other = n_stack_params - i - 1;
518 int tmp = stack_param_idx[i];
519 stack_param_idx[i] = stack_param_idx[other];
520 stack_param_idx[other] = tmp;
524 curr_mem = get_Call_mem(irn);
526 obstack_ptr_grow(obst, curr_mem);
529 for (i = 0; i < n_stack_params; ++i) {
530 int p = stack_param_idx[i];
531 be_abi_call_arg_t *arg = get_call_arg(call, 0, p);
532 ir_node *param = get_Call_param(irn, p);
533 ir_node *addr = curr_sp;
535 ir_type *param_type = get_method_param_type(call_tp, p);
536 int param_size = get_type_size_bytes(param_type) + arg->space_after;
539 * If we wanted to build the arguments sequentially,
540 * the stack pointer for the next must be incremented,
541 * and the memory value propagated.
545 addr = curr_sp = be_new_IncSP(sp, irg, bl, curr_sp, param_size + arg->space_before, 0);
546 add_irn_dep(curr_sp, curr_mem);
549 curr_ofs += arg->space_before;
550 curr_ofs = round_up2(curr_ofs, arg->alignment);
552 /* Make the expression to compute the argument's offset. */
554 ir_mode *constmode = mach_mode;
555 if (mode_is_reference(mach_mode)) {
558 addr = new_r_Const_long(irg, constmode, curr_ofs);
559 addr = new_r_Add(irg, bl, curr_sp, addr, mach_mode);
563 /* Insert a store for primitive arguments. */
564 if (is_atomic_type(param_type)) {
566 ir_node *mem_input = do_seq ? curr_mem : new_NoMem();
567 store = new_rd_Store(dbgi, irg, bl, mem_input, addr, param, 0);
568 mem = new_r_Proj(irg, bl, store, mode_M, pn_Store_M);
571 /* Make a mem copy for compound arguments. */
575 assert(mode_is_reference(get_irn_mode(param)));
576 copy = new_rd_CopyB(dbgi, irg, bl, curr_mem, addr, param, param_type);
577 mem = new_r_Proj(irg, bl, copy, mode_M, pn_CopyB_M_regular);
580 curr_ofs += param_size;
585 obstack_ptr_grow(obst, mem);
588 in = (ir_node **) obstack_finish(obst);
590 /* We need the sync only, if we didn't build the stores sequentially. */
592 if (n_stack_params >= 1) {
593 curr_mem = new_r_Sync(irg, bl, n_stack_params + 1, in);
595 curr_mem = get_Call_mem(irn);
598 obstack_free(obst, in);
601 /* check for the return_twice property */
602 destroy_all_regs = 0;
603 if (is_SymConst_addr_ent(call_ptr)) {
604 ir_entity *ent = get_SymConst_entity(call_ptr);
606 if (get_entity_additional_properties(ent) & mtp_property_returns_twice)
607 destroy_all_regs = 1;
609 ir_type *call_tp = get_Call_type(irn);
611 if (get_method_additional_properties(call_tp) & mtp_property_returns_twice)
612 destroy_all_regs = 1;
615 /* Put caller save into the destroyed set and state registers in the states set */
616 for (i = 0, n = arch_env_get_n_reg_class(arch_env); i < n; ++i) {
618 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
619 for (j = 0; j < cls->n_regs; ++j) {
620 const arch_register_t *reg = arch_register_for_index(cls, j);
622 if (destroy_all_regs || arch_register_type_is(reg, caller_save)) {
623 if (! arch_register_type_is(reg, ignore))
624 pset_new_insert(&destroyed_regs, (void *) reg);
626 if (arch_register_type_is(reg, state)) {
627 pset_new_insert(&destroyed_regs, (void*) reg);
628 pset_new_insert(&states, (void*) reg);
633 if (destroy_all_regs) {
634 /* even if destroyed all is specified, neither SP nor FP are destroyed (else bad things will happen) */
635 pset_new_remove(&destroyed_regs, arch_env->sp);
636 pset_new_remove(&destroyed_regs, arch_env->bp);
639 /* search the largest result proj number */
640 res_projs = ALLOCANZ(ir_node*, n_res);
642 foreach_out_edge(irn, edge) {
643 const ir_edge_t *res_edge;
644 ir_node *irn = get_edge_src_irn(edge);
646 if (!is_Proj(irn) || get_Proj_proj(irn) != pn_Call_T_result)
649 foreach_out_edge(irn, res_edge) {
651 ir_node *res = get_edge_src_irn(res_edge);
653 assert(is_Proj(res));
655 proj = get_Proj_proj(res);
656 assert(proj < n_res);
657 assert(res_projs[proj] == NULL);
658 res_projs[proj] = res;
664 /** TODO: this is not correct for cases where return values are passed
665 * on the stack, but no known ABI does this currently...
667 n_reg_results = n_res;
669 /* make the back end call node and set its register requirements. */
670 for (i = 0; i < n_reg_params; ++i) {
671 obstack_ptr_grow(obst, get_Call_param(irn, reg_param_idxs[i]));
674 /* add state registers ins */
675 foreach_pset_new(&states, reg, iter) {
676 const arch_register_class_t *cls = arch_register_get_class(reg);
678 ir_node *regnode = be_abi_reg_map_get(env->regs, reg);
679 ir_fprintf(stderr, "Adding %+F\n", regnode);
681 ir_node *regnode = new_rd_Unknown(irg, arch_register_class_mode(cls));
682 obstack_ptr_grow(obst, regnode);
684 n_ins = n_reg_params + pset_new_size(&states);
686 in = obstack_finish(obst);
688 /* ins collected, build the call */
689 if (env->call->flags.bits.call_has_imm && is_SymConst(call_ptr)) {
691 low_call = be_new_Call(dbgi, irg, bl, curr_mem, curr_sp, curr_sp,
692 n_reg_results + pn_be_Call_first_res + pset_new_size(&destroyed_regs),
693 n_ins, in, get_Call_type(irn));
694 be_Call_set_entity(low_call, get_SymConst_entity(call_ptr));
697 low_call = be_new_Call(dbgi, irg, bl, curr_mem, curr_sp, call_ptr,
698 n_reg_results + pn_be_Call_first_res + pset_new_size(&destroyed_regs),
699 n_ins, in, get_Call_type(irn));
701 be_Call_set_pop(low_call, call->pop);
703 /* put the call into the list of all calls for later processing */
704 ARR_APP1(ir_node *, env->calls, low_call);
706 /* create new stack pointer */
707 curr_sp = new_r_Proj(irg, bl, low_call, get_irn_mode(curr_sp),
709 be_set_constr_single_reg_out(low_call, pn_be_Call_sp, sp,
710 arch_register_req_type_ignore | arch_register_req_type_produces_sp);
711 arch_set_irn_register(curr_sp, sp);
713 /* now handle results */
714 for (i = 0; i < n_res; ++i) {
716 ir_node *proj = res_projs[i];
717 be_abi_call_arg_t *arg = get_call_arg(call, 1, i);
719 /* returns values on stack not supported yet */
723 shift the proj number to the right, since we will drop the
724 unspeakable Proj_T from the Call. Therefore, all real argument
725 Proj numbers must be increased by pn_be_Call_first_res
727 pn = i + pn_be_Call_first_res;
730 ir_type *res_type = get_method_res_type(call_tp, i);
731 ir_mode *mode = get_type_mode(res_type);
732 proj = new_r_Proj(irg, bl, low_call, mode, pn);
735 set_Proj_pred(proj, low_call);
736 set_Proj_proj(proj, pn);
740 pset_new_remove(&destroyed_regs, arg->reg);
745 Set the register class of the call address to
746 the backend provided class (default: stack pointer class)
748 be_node_set_reg_class_in(low_call, be_pos_Call_ptr, call->cls_addr);
750 DBG((env->dbg, LEVEL_3, "\tcreated backend call %+F\n", low_call));
752 /* Set the register classes and constraints of the Call parameters. */
753 for (i = 0; i < n_reg_params; ++i) {
754 int index = reg_param_idxs[i];
755 be_abi_call_arg_t *arg = get_call_arg(call, 0, index);
756 assert(arg->reg != NULL);
758 be_set_constr_single_reg_in(low_call, be_pos_Call_first_arg + i,
762 /* Set the register constraints of the results. */
763 for (i = 0; i < n_res; ++i) {
764 ir_node *proj = res_projs[i];
765 const be_abi_call_arg_t *arg = get_call_arg(call, 1, i);
766 int pn = get_Proj_proj(proj);
769 be_set_constr_single_reg_out(low_call, pn, arg->reg, 0);
770 arch_set_irn_register(proj, arg->reg);
772 obstack_free(obst, in);
773 exchange(irn, low_call);
775 /* kill the ProjT node */
776 if (res_proj != NULL) {
780 /* Make additional projs for the caller save registers
781 and the Keep node which keeps them alive. */
783 const arch_register_t *reg;
787 int curr_res_proj = pn_be_Call_first_res + n_reg_results;
788 pset_new_iterator_t iter;
790 /* also keep the stack pointer */
792 set_irn_link(curr_sp, (void*) sp);
793 obstack_ptr_grow(obst, curr_sp);
795 foreach_pset_new(&destroyed_regs, reg, iter) {
796 ir_node *proj = new_r_Proj(irg, bl, low_call, reg->reg_class->mode, curr_res_proj);
798 /* memorize the register in the link field. we need afterwards to set the register class of the keep correctly. */
799 be_set_constr_single_reg_out(low_call, curr_res_proj, reg, 0);
800 arch_set_irn_register(proj, reg);
802 set_irn_link(proj, (void*) reg);
803 obstack_ptr_grow(obst, proj);
808 for (i = 0; i < n_reg_results; ++i) {
809 ir_node *proj = res_projs[i];
810 const arch_register_t *reg = arch_get_irn_register(proj);
811 set_irn_link(proj, (void*) reg);
812 obstack_ptr_grow(obst, proj);
816 /* create the Keep for the caller save registers */
817 in = (ir_node **) obstack_finish(obst);
818 keep = be_new_Keep(NULL, irg, bl, n, in);
819 for (i = 0; i < n; ++i) {
820 const arch_register_t *reg = get_irn_link(in[i]);
821 be_node_set_reg_class_in(keep, i, reg->reg_class);
823 obstack_free(obst, in);
826 /* Clean up the stack. */
827 assert(stack_size >= call->pop);
828 stack_size -= call->pop;
830 if (stack_size > 0) {
831 ir_node *mem_proj = NULL;
833 foreach_out_edge(low_call, edge) {
834 ir_node *irn = get_edge_src_irn(edge);
835 if (is_Proj(irn) && get_Proj_proj(irn) == pn_Call_M) {
842 mem_proj = new_r_Proj(irg, bl, low_call, mode_M, pn_be_Call_M_regular);
843 keep_alive(mem_proj);
846 /* Clean up the stack frame or revert alignment fixes if we allocated it */
848 curr_sp = be_new_IncSP(sp, irg, bl, curr_sp, -stack_size, 0);
851 be_abi_call_free(call);
852 obstack_free(obst, stack_param_idx);
854 pset_new_destroy(&states);
855 pset_new_destroy(&destroyed_regs);
861 * Adjust the size of a node representing a stack alloc or free for the minimum stack alignment.
863 * @param alignment the minimum stack alignment
864 * @param size the node containing the non-aligned size
865 * @param irg the irg where new nodes are allocated on
866 * @param irg the block where new nodes are allocated on
867 * @param dbg debug info for new nodes
869 * @return a node representing the aligned size
871 static ir_node *adjust_alloc_size(unsigned stack_alignment, ir_node *size,
872 ir_graph *irg, ir_node *block, dbg_info *dbg)
874 if (stack_alignment > 1) {
879 assert(is_po2(stack_alignment));
881 mode = get_irn_mode(size);
882 tv = new_tarval_from_long(stack_alignment-1, mode);
883 mask = new_r_Const(irg, tv);
884 size = new_rd_Add(dbg, irg, block, size, mask, mode);
886 tv = new_tarval_from_long(-(long)stack_alignment, mode);
887 mask = new_r_Const(irg, tv);
888 size = new_rd_And(dbg, irg, block, size, mask, mode);
894 * The alloca is transformed into a back end alloca node and connected to the stack nodes.
896 static ir_node *adjust_alloc(be_abi_irg_t *env, ir_node *alloc, ir_node *curr_sp)
905 const ir_edge_t *edge;
906 ir_node *new_alloc, *size, *addr, *ins[2];
907 unsigned stack_alignment;
909 assert(get_Alloc_where(alloc) == stack_alloc);
911 block = get_nodes_block(alloc);
912 irg = get_irn_irg(block);
915 type = get_Alloc_type(alloc);
917 foreach_out_edge(alloc, edge) {
918 ir_node *irn = get_edge_src_irn(edge);
920 assert(is_Proj(irn));
921 switch (get_Proj_proj(irn)) {
933 /* Beware: currently Alloc nodes without a result might happen,
934 only escape analysis kills them and this phase runs only for object
935 oriented source. We kill the Alloc here. */
936 if (alloc_res == NULL && alloc_mem) {
937 exchange(alloc_mem, get_Alloc_mem(alloc));
941 dbg = get_irn_dbg_info(alloc);
942 size = get_Alloc_size(alloc);
944 /* we might need to multiply the size with the element size */
945 if (type != firm_unknown_type && get_type_size_bytes(type) != 1) {
946 ir_mode *mode = get_irn_mode(size);
947 tarval *tv = new_tarval_from_long(get_type_size_bytes(type),
949 ir_node *cnst = new_rd_Const(dbg, irg, tv);
950 size = new_rd_Mul(dbg, irg, block, size, cnst, mode);
953 /* The stack pointer will be modified in an unknown manner.
954 We cannot omit it. */
955 env->call->flags.bits.try_omit_fp = 0;
957 stack_alignment = 1 << env->arch_env->stack_alignment;
958 size = adjust_alloc_size(stack_alignment, size, irg, block, dbg);
959 new_alloc = be_new_AddSP(env->arch_env->sp, irg, block, curr_sp, size);
960 set_irn_dbg_info(new_alloc, dbg);
962 if (alloc_mem != NULL) {
966 addsp_mem = new_r_Proj(irg, block, new_alloc, mode_M, pn_be_AddSP_M);
968 /* We need to sync the output mem of the AddSP with the input mem
969 edge into the alloc node. */
970 ins[0] = get_Alloc_mem(alloc);
972 sync = new_r_Sync(irg, block, 2, ins);
974 exchange(alloc_mem, sync);
977 exchange(alloc, new_alloc);
979 /* fix projnum of alloca res */
980 set_Proj_proj(alloc_res, pn_be_AddSP_res);
983 curr_sp = new_r_Proj(irg, block, new_alloc, get_irn_mode(curr_sp),
991 * The Free is transformed into a back end free node and connected to the stack nodes.
993 static ir_node *adjust_free(be_abi_irg_t *env, ir_node *free, ir_node *curr_sp)
997 ir_node *subsp, *mem, *res, *size, *sync;
1001 unsigned stack_alignment;
1004 assert(get_Free_where(free) == stack_alloc);
1006 block = get_nodes_block(free);
1007 irg = get_irn_irg(block);
1008 type = get_Free_type(free);
1009 sp_mode = env->arch_env->sp->reg_class->mode;
1010 dbg = get_irn_dbg_info(free);
1012 /* we might need to multiply the size with the element size */
1013 if (type != firm_unknown_type && get_type_size_bytes(type) != 1) {
1014 tarval *tv = new_tarval_from_long(get_type_size_bytes(type), mode_Iu);
1015 ir_node *cnst = new_rd_Const(dbg, irg, tv);
1016 ir_node *mul = new_rd_Mul(dbg, irg, block, get_Free_size(free),
1020 size = get_Free_size(free);
1023 stack_alignment = 1 << env->arch_env->stack_alignment;
1024 size = adjust_alloc_size(stack_alignment, size, irg, block, dbg);
1026 /* The stack pointer will be modified in an unknown manner.
1027 We cannot omit it. */
1028 env->call->flags.bits.try_omit_fp = 0;
1029 subsp = be_new_SubSP(env->arch_env->sp, irg, block, curr_sp, size);
1030 set_irn_dbg_info(subsp, dbg);
1032 mem = new_r_Proj(irg, block, subsp, mode_M, pn_be_SubSP_M);
1033 res = new_r_Proj(irg, block, subsp, sp_mode, pn_be_SubSP_sp);
1035 /* we need to sync the memory */
1036 in[0] = get_Free_mem(free);
1038 sync = new_r_Sync(irg, block, 2, in);
1040 /* and make the AddSP dependent on the former memory */
1041 add_irn_dep(subsp, get_Free_mem(free));
1044 exchange(free, sync);
1050 /* the following function is replaced by the usage of the heights module */
1053 * Walker for dependent_on().
1054 * This function searches a node tgt recursively from a given node
1055 * but is restricted to the given block.
1056 * @return 1 if tgt was reachable from curr, 0 if not.
1058 static int check_dependence(ir_node *curr, ir_node *tgt, ir_node *bl)
1062 if (get_nodes_block(curr) != bl)
1068 /* Phi functions stop the recursion inside a basic block */
1069 if (! is_Phi(curr)) {
1070 for (i = 0, n = get_irn_arity(curr); i < n; ++i) {
1071 if (check_dependence(get_irn_n(curr, i), tgt, bl))
1081 * Check if a node is somehow data dependent on another one.
1082 * both nodes must be in the same basic block.
1083 * @param n1 The first node.
1084 * @param n2 The second node.
1085 * @return 1, if n1 is data dependent (transitively) on n2, 0 if not.
1087 static int dependent_on(ir_node *n1, ir_node *n2)
1089 assert(get_nodes_block(n1) == get_nodes_block(n2));
1091 return heights_reachable_in_block(ir_heights, n1, n2);
1094 static int cmp_call_dependency(const void *c1, const void *c2)
1096 ir_node *n1 = *(ir_node **) c1;
1097 ir_node *n2 = *(ir_node **) c2;
1100 Classical qsort() comparison function behavior:
1101 0 if both elements are equal
1102 1 if second is "smaller" that first
1103 -1 if first is "smaller" that second
1105 if (dependent_on(n1, n2))
1108 if (dependent_on(n2, n1))
1115 * Walker: links all Call/Alloc/Free nodes to the Block they are contained.
1116 * Clears the irg_is_leaf flag if a Call is detected.
1118 static void link_ops_in_block_walker(ir_node *irn, void *data)
1120 ir_opcode code = get_irn_opcode(irn);
1122 if (code == iro_Call ||
1123 (code == iro_Alloc && get_Alloc_where(irn) == stack_alloc) ||
1124 (code == iro_Free && get_Free_where(irn) == stack_alloc)) {
1125 be_abi_irg_t *env = data;
1126 ir_node *bl = get_nodes_block(irn);
1127 void *save = get_irn_link(bl);
1129 if (code == iro_Call)
1130 env->call->flags.bits.irg_is_leaf = 0;
1132 set_irn_link(irn, save);
1133 set_irn_link(bl, irn);
1139 * Process all Call/Alloc/Free nodes inside a basic block.
1140 * Note that the link field of the block must contain a linked list of all
1141 * Call nodes inside the Block. We first order this list according to data dependency
1142 * and that connect the calls together.
1144 static void process_ops_in_block(ir_node *bl, void *data)
1146 be_abi_irg_t *env = data;
1147 ir_node *curr_sp = env->init_sp;
1151 for (irn = get_irn_link(bl), n = 0; irn; irn = get_irn_link(irn), ++n)
1152 obstack_ptr_grow(&env->obst, irn);
1154 /* If there were call nodes in the block. */
1160 nodes = obstack_finish(&env->obst);
1162 /* order the call nodes according to data dependency */
1163 qsort(nodes, n, sizeof(nodes[0]), cmp_call_dependency);
1165 for (i = n - 1; i >= 0; --i) {
1166 ir_node *irn = nodes[i];
1168 DBG((env->dbg, LEVEL_3, "\tprocessing call %+F\n", irn));
1169 switch (get_irn_opcode(irn)) {
1172 /* The stack pointer will be modified due to a call. */
1173 env->call->flags.bits.try_omit_fp = 0;
1175 curr_sp = adjust_call(env, irn, curr_sp);
1178 if (get_Alloc_where(irn) == stack_alloc)
1179 curr_sp = adjust_alloc(env, irn, curr_sp);
1182 if (get_Free_where(irn) == stack_alloc)
1183 curr_sp = adjust_free(env, irn, curr_sp);
1186 panic("invalid call");
1191 obstack_free(&env->obst, nodes);
1193 /* Keep the last stack state in the block by tying it to Keep node,
1194 * the proj from calls is already kept */
1195 if (curr_sp != env->init_sp &&
1196 !(is_Proj(curr_sp) && be_is_Call(get_Proj_pred(curr_sp)))) {
1198 keep = be_new_Keep(env->arch_env->sp->reg_class,
1199 get_irn_irg(bl), bl, 1, nodes);
1200 pmap_insert(env->keep_map, bl, keep);
1204 set_irn_link(bl, curr_sp);
1205 } /* process_ops_in_block */
1208 * Adjust all call nodes in the graph to the ABI conventions.
1210 static void process_calls(be_abi_irg_t *env)
1212 ir_graph *irg = env->birg->irg;
1214 env->call->flags.bits.irg_is_leaf = 1;
1215 irg_walk_graph(irg, firm_clear_link, link_ops_in_block_walker, env);
1217 ir_heights = heights_new(env->birg->irg);
1218 irg_block_walk_graph(irg, NULL, process_ops_in_block, env);
1219 heights_free(ir_heights);
1223 * Computes the stack argument layout type.
1224 * Changes a possibly allocated value param type by moving
1225 * entities to the stack layout type.
1227 * @param env the ABI environment
1228 * @param call the current call ABI
1229 * @param method_type the method type
1230 * @param param_map an array mapping method arguments to the stack layout type
1232 * @return the stack argument layout type
1234 static ir_type *compute_arg_type(be_abi_irg_t *env, be_abi_call_t *call, ir_type *method_type, ir_entity ***param_map)
1236 int dir = env->call->flags.bits.left_to_right ? 1 : -1;
1237 int inc = env->birg->main_env->arch_env->stack_dir * dir;
1238 int n = get_method_n_params(method_type);
1239 int curr = inc > 0 ? 0 : n - 1;
1245 ir_type *val_param_tp = get_method_value_param_type(method_type);
1246 ident *id = get_entity_ident(get_irg_entity(env->birg->irg));
1249 *param_map = map = obstack_alloc(&env->obst, n * sizeof(ir_entity *));
1250 res = new_type_struct(id_mangle_u(id, new_id_from_chars("arg_type", 8)));
1251 for (i = 0; i < n; ++i, curr += inc) {
1252 ir_type *param_type = get_method_param_type(method_type, curr);
1253 be_abi_call_arg_t *arg = get_call_arg(call, 0, curr);
1256 if (arg->on_stack) {
1258 /* the entity was already created, move it to the param type */
1259 arg->stack_ent = get_method_value_param_ent(method_type, i);
1260 remove_struct_member(val_param_tp, arg->stack_ent);
1261 set_entity_owner(arg->stack_ent, res);
1262 add_struct_member(res, arg->stack_ent);
1263 /* must be automatic to set a fixed layout */
1264 set_entity_allocation(arg->stack_ent, allocation_automatic);
1267 snprintf(buf, sizeof(buf), "param_%d", i);
1268 arg->stack_ent = new_entity(res, new_id_from_str(buf), param_type);
1270 ofs += arg->space_before;
1271 ofs = round_up2(ofs, arg->alignment);
1272 set_entity_offset(arg->stack_ent, ofs);
1273 ofs += arg->space_after;
1274 ofs += get_type_size_bytes(param_type);
1275 map[i] = arg->stack_ent;
1278 set_type_size_bytes(res, ofs);
1279 set_type_state(res, layout_fixed);
1284 const arch_register_t *reg;
1288 static int cmp_regs(const void *a, const void *b)
1290 const reg_node_map_t *p = a;
1291 const reg_node_map_t *q = b;
1293 if (p->reg->reg_class == q->reg->reg_class)
1294 return p->reg->index - q->reg->index;
1296 return p->reg->reg_class - q->reg->reg_class;
1299 static reg_node_map_t *reg_map_to_arr(struct obstack *obst, pmap *reg_map)
1302 int n = pmap_count(reg_map);
1304 reg_node_map_t *res = obstack_alloc(obst, n * sizeof(res[0]));
1306 foreach_pmap(reg_map, ent) {
1307 res[i].reg = ent->key;
1308 res[i].irn = ent->value;
1312 qsort(res, n, sizeof(res[0]), cmp_regs);
1317 * Creates a barrier.
1319 static ir_node *create_barrier(be_abi_irg_t *env, ir_node *bl, ir_node **mem, pmap *regs, int in_req)
1321 ir_graph *irg = env->birg->irg;
1322 int n_regs = pmap_count(regs);
1328 rm = reg_map_to_arr(&env->obst, regs);
1330 for (n = 0; n < n_regs; ++n)
1331 obstack_ptr_grow(&env->obst, rm[n].irn);
1334 obstack_ptr_grow(&env->obst, *mem);
1338 in = (ir_node **) obstack_finish(&env->obst);
1339 irn = be_new_Barrier(irg, bl, n, in);
1340 obstack_free(&env->obst, in);
1342 for (n = 0; n < n_regs; ++n) {
1343 ir_node *pred = rm[n].irn;
1344 const arch_register_t *reg = rm[n].reg;
1345 arch_register_type_t add_type = 0;
1348 /* stupid workaround for now... as not all nodes report register
1350 if (!is_Phi(pred)) {
1351 const arch_register_req_t *ireq = arch_get_register_req_out(pred);
1352 if (ireq->type & arch_register_req_type_ignore)
1353 add_type |= arch_register_req_type_ignore;
1354 if (ireq->type & arch_register_req_type_produces_sp)
1355 add_type |= arch_register_req_type_produces_sp;
1358 proj = new_r_Proj(irg, bl, irn, get_irn_mode(pred), n);
1359 be_node_set_reg_class_in(irn, n, reg->reg_class);
1361 be_set_constr_single_reg_in(irn, n, reg, 0);
1362 be_set_constr_single_reg_out(irn, n, reg, add_type);
1363 arch_set_irn_register(proj, reg);
1365 pmap_insert(regs, (void *) reg, proj);
1369 *mem = new_r_Proj(irg, bl, irn, mode_M, n);
1372 obstack_free(&env->obst, rm);
1377 * Creates a be_Return for a Return node.
1379 * @param @env the abi environment
1380 * @param irn the Return node or NULL if there was none
1381 * @param bl the block where the be_Retun should be placed
1382 * @param mem the current memory
1383 * @param n_res number of return results
1385 static ir_node *create_be_return(be_abi_irg_t *env, ir_node *irn, ir_node *bl,
1386 ir_node *mem, int n_res)
1388 be_abi_call_t *call = env->call;
1389 const arch_env_t *arch_env = env->birg->main_env->arch_env;
1391 pmap *reg_map = pmap_create();
1392 ir_node *keep = pmap_get(env->keep_map, bl);
1399 const arch_register_t **regs;
1403 get the valid stack node in this block.
1404 If we had a call in that block there is a Keep constructed by process_calls()
1405 which points to the last stack modification in that block. we'll use
1406 it then. Else we use the stack from the start block and let
1407 the ssa construction fix the usage.
1409 stack = be_abi_reg_map_get(env->regs, arch_env->sp);
1411 stack = get_irn_n(keep, 0);
1413 remove_End_keepalive(get_irg_end(env->birg->irg), keep);
1416 /* Insert results for Return into the register map. */
1417 for (i = 0; i < n_res; ++i) {
1418 ir_node *res = get_Return_res(irn, i);
1419 be_abi_call_arg_t *arg = get_call_arg(call, 1, i);
1420 assert(arg->in_reg && "return value must be passed in register");
1421 pmap_insert(reg_map, (void *) arg->reg, res);
1424 /* Add uses of the callee save registers. */
1425 foreach_pmap(env->regs, ent) {
1426 const arch_register_t *reg = ent->key;
1427 if (arch_register_type_is(reg, callee_save) || arch_register_type_is(reg, ignore))
1428 pmap_insert(reg_map, ent->key, ent->value);
1431 be_abi_reg_map_set(reg_map, arch_env->sp, stack);
1433 /* Make the Epilogue node and call the arch's epilogue maker. */
1434 create_barrier(env, bl, &mem, reg_map, 1);
1435 call->cb->epilogue(env->cb, bl, &mem, reg_map);
1438 Maximum size of the in array for Return nodes is
1439 return args + callee save/ignore registers + memory + stack pointer
1441 in_max = pmap_count(reg_map) + n_res + 2;
1443 in = obstack_alloc(&env->obst, in_max * sizeof(in[0]));
1444 regs = obstack_alloc(&env->obst, in_max * sizeof(regs[0]));
1447 in[1] = be_abi_reg_map_get(reg_map, arch_env->sp);
1449 regs[1] = arch_env->sp;
1452 /* clear SP entry, since it has already been grown. */
1453 pmap_insert(reg_map, (void *) arch_env->sp, NULL);
1454 for (i = 0; i < n_res; ++i) {
1455 be_abi_call_arg_t *arg = get_call_arg(call, 1, i);
1457 in[n] = be_abi_reg_map_get(reg_map, arg->reg);
1458 regs[n++] = arg->reg;
1460 /* Clear the map entry to mark the register as processed. */
1461 be_abi_reg_map_set(reg_map, arg->reg, NULL);
1464 /* grow the rest of the stuff. */
1465 foreach_pmap(reg_map, ent) {
1468 regs[n++] = ent->key;
1472 /* The in array for the new back end return is now ready. */
1474 dbgi = get_irn_dbg_info(irn);
1478 /* we have to pop the shadow parameter in in case of struct returns */
1480 ret = be_new_Return(dbgi, env->birg->irg, bl, n_res, pop, n, in);
1482 /* Set the register classes of the return's parameter accordingly. */
1483 for (i = 0; i < n; ++i) {
1484 if (regs[i] == NULL)
1487 be_node_set_reg_class_in(ret, i, regs[i]->reg_class);
1490 /* Free the space of the Epilog's in array and the register <-> proj map. */
1491 obstack_free(&env->obst, in);
1492 pmap_destroy(reg_map);
1497 typedef struct lower_frame_sels_env_t {
1499 ir_entity *value_param_list; /**< the list of all value param entities */
1500 ir_entity *value_param_tail; /**< the tail of the list of all value param entities */
1501 } lower_frame_sels_env_t;
1504 * Walker: Replaces Sels of frame type and
1505 * value param type entities by FrameAddress.
1506 * Links all used entities.
1508 static void lower_frame_sels_walker(ir_node *irn, void *data)
1510 lower_frame_sels_env_t *ctx = data;
1513 ir_graph *irg = current_ir_graph;
1514 ir_node *frame = get_irg_frame(irg);
1515 ir_node *param_base = get_irg_value_param_base(irg);
1516 ir_node *ptr = get_Sel_ptr(irn);
1518 if (ptr == frame || ptr == param_base) {
1519 be_abi_irg_t *env = ctx->env;
1520 ir_entity *ent = get_Sel_entity(irn);
1521 ir_node *bl = get_nodes_block(irn);
1524 nw = be_new_FrameAddr(env->arch_env->sp->reg_class, irg, bl, frame, ent);
1527 /* check, if it's a param sel and if have not seen this entity before */
1528 if (ptr == param_base &&
1529 ent != ctx->value_param_tail &&
1530 get_entity_link(ent) == NULL) {
1531 set_entity_link(ent, ctx->value_param_list);
1532 ctx->value_param_list = ent;
1533 if (ctx->value_param_tail == NULL) ctx->value_param_tail = ent;
1540 * Check if a value parameter is transmitted as a register.
1541 * This might happen if the address of an parameter is taken which is
1542 * transmitted in registers.
1544 * Note that on some architectures this case must be handled specially
1545 * because the place of the backing store is determined by their ABI.
1547 * In the default case we move the entity to the frame type and create
1548 * a backing store into the first block.
1550 static void fix_address_of_parameter_access(be_abi_irg_t *env, ir_entity *value_param_list)
1552 be_abi_call_t *call = env->call;
1553 ir_graph *irg = env->birg->irg;
1554 ir_entity *ent, *next_ent, *new_list;
1556 DEBUG_ONLY(firm_dbg_module_t *dbg = env->dbg;)
1559 for (ent = value_param_list; ent; ent = next_ent) {
1560 int i = get_struct_member_index(get_entity_owner(ent), ent);
1561 be_abi_call_arg_t *arg = get_call_arg(call, 0, i);
1563 next_ent = get_entity_link(ent);
1565 DBG((dbg, LEVEL_2, "\targ #%d need backing store\n", i));
1566 set_entity_link(ent, new_list);
1571 /* ok, change the graph */
1572 ir_node *start_bl = get_irg_start_block(irg);
1573 ir_node *first_bl = NULL;
1574 ir_node *frame, *imem, *nmem, *store, *mem, *args, *args_bl;
1575 const ir_edge_t *edge;
1576 optimization_state_t state;
1579 foreach_block_succ(start_bl, edge) {
1580 ir_node *succ = get_edge_src_irn(edge);
1581 if (start_bl != succ) {
1587 /* we had already removed critical edges, so the following
1588 assertion should be always true. */
1589 assert(get_Block_n_cfgpreds(first_bl) == 1);
1591 /* now create backing stores */
1592 frame = get_irg_frame(irg);
1593 imem = get_irg_initial_mem(irg);
1595 save_optimization_state(&state);
1597 nmem = new_r_Proj(irg, first_bl, get_irg_start(irg), mode_M, pn_Start_M);
1598 restore_optimization_state(&state);
1600 /* reroute all edges to the new memory source */
1601 edges_reroute(imem, nmem, irg);
1605 args = get_irg_args(irg);
1606 args_bl = get_nodes_block(args);
1607 for (ent = new_list; ent; ent = get_entity_link(ent)) {
1608 int i = get_struct_member_index(get_entity_owner(ent), ent);
1609 ir_type *tp = get_entity_type(ent);
1610 ir_mode *mode = get_type_mode(tp);
1613 /* address for the backing store */
1614 addr = be_new_FrameAddr(env->arch_env->sp->reg_class, irg, first_bl, frame, ent);
1617 mem = new_r_Proj(irg, first_bl, store, mode_M, pn_Store_M);
1619 /* the backing store itself */
1620 store = new_r_Store(irg, first_bl, mem, addr,
1621 new_r_Proj(irg, args_bl, args, mode, i), 0);
1623 /* the new memory Proj gets the last Proj from store */
1624 set_Proj_pred(nmem, store);
1625 set_Proj_proj(nmem, pn_Store_M);
1627 /* move all entities to the frame type */
1628 frame_tp = get_irg_frame_type(irg);
1629 offset = get_type_size_bytes(frame_tp);
1631 /* we will add new entities: set the layout to undefined */
1632 assert(get_type_state(frame_tp) == layout_fixed);
1633 set_type_state(frame_tp, layout_undefined);
1634 for (ent = new_list; ent; ent = get_entity_link(ent)) {
1635 ir_type *tp = get_entity_type(ent);
1636 unsigned align = get_type_alignment_bytes(tp);
1638 offset += align - 1;
1639 offset &= ~(align - 1);
1640 set_entity_owner(ent, frame_tp);
1641 add_class_member(frame_tp, ent);
1642 /* must be automatic to set a fixed layout */
1643 set_entity_allocation(ent, allocation_automatic);
1644 set_entity_offset(ent, offset);
1645 offset += get_type_size_bytes(tp);
1647 set_type_size_bytes(frame_tp, offset);
1648 /* fix the layout again */
1649 set_type_state(frame_tp, layout_fixed);
1654 * The start block has no jump, instead it has an initial exec Proj.
1655 * The backend wants to handle all blocks the same way, so we replace
1656 * the out cfg edge with a real jump.
1658 static void fix_start_block(ir_graph *irg)
1660 ir_node *initial_X = get_irg_initial_exec(irg);
1661 ir_node *start_block = get_irg_start_block(irg);
1662 const ir_edge_t *edge;
1664 assert(is_Proj(initial_X));
1666 foreach_out_edge(initial_X, edge) {
1667 ir_node *block = get_edge_src_irn(edge);
1669 if (is_Anchor(block))
1671 if (block != start_block) {
1672 ir_node *jmp = new_r_Jmp(irg, start_block);
1674 set_Block_cfgpred(block, get_edge_src_pos(edge), jmp);
1678 panic("Initial exec has no follow block");
1682 * Modify the irg itself and the frame type.
1684 static void modify_irg(be_abi_irg_t *env)
1686 be_abi_call_t *call = env->call;
1687 const arch_env_t *arch_env= env->birg->main_env->arch_env;
1688 const arch_register_t *sp = arch_env_sp(arch_env);
1689 ir_graph *irg = env->birg->irg;
1693 ir_node *new_mem_proj;
1695 ir_type *method_type = get_entity_type(get_irg_entity(irg));
1702 const arch_register_t *fp_reg;
1703 ir_node *frame_pointer;
1704 ir_node *reg_params_bl;
1707 ir_node *value_param_base;
1708 const ir_edge_t *edge;
1709 ir_type *arg_type, *bet_type, *tp;
1710 lower_frame_sels_env_t ctx;
1711 ir_entity **param_map;
1713 DEBUG_ONLY(firm_dbg_module_t *dbg = env->dbg;)
1715 DBG((dbg, LEVEL_1, "introducing abi on %+F\n", irg));
1717 /* Must fetch memory here, otherwise the start Barrier gets the wrong
1718 * memory, which leads to loops in the DAG. */
1719 old_mem = get_irg_initial_mem(irg);
1721 irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
1722 /* set the links of all frame entities to NULL, we use it
1723 to detect if an entity is already linked in the value_param_list */
1724 tp = get_method_value_param_type(method_type);
1726 for (i = get_struct_n_members(tp) - 1; i >= 0; --i)
1727 set_entity_link(get_struct_member(tp, i), NULL);
1730 /* Convert the Sel nodes in the irg to frame load/store/addr nodes. */
1732 ctx.value_param_list = NULL;
1733 ctx.value_param_tail = NULL;
1734 irg_walk_graph(irg, lower_frame_sels_walker, NULL, &ctx);
1736 /* value_param_base anchor is not needed anymore now */
1737 value_param_base = get_irg_value_param_base(irg);
1738 kill_node(value_param_base);
1739 set_irg_value_param_base(irg, new_r_Bad(irg));
1741 env->regs = pmap_create();
1743 n_params = get_method_n_params(method_type);
1744 args = obstack_alloc(&env->obst, n_params * sizeof(args[0]));
1745 memset(args, 0, n_params * sizeof(args[0]));
1747 /* Check if a value parameter is transmitted as a register.
1748 * This might happen if the address of an parameter is taken which is
1749 * transmitted in registers.
1751 * Note that on some architectures this case must be handled specially
1752 * because the place of the backing store is determined by their ABI.
1754 * In the default case we move the entity to the frame type and create
1755 * a backing store into the first block.
1757 fix_address_of_parameter_access(env, ctx.value_param_list);
1758 irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
1760 /* Fill the argument vector */
1761 arg_tuple = get_irg_args(irg);
1762 foreach_out_edge(arg_tuple, edge) {
1763 ir_node *irn = get_edge_src_irn(edge);
1764 if (! is_Anchor(irn)) {
1765 int nr = get_Proj_proj(irn);
1767 DBG((dbg, LEVEL_2, "\treading arg: %d -> %+F\n", nr, irn));
1771 arg_type = compute_arg_type(env, call, method_type, ¶m_map);
1772 bet_type = call->cb->get_between_type(env->cb);
1773 stack_frame_init(&env->frame, arg_type, bet_type, get_irg_frame_type(irg), arch_env->stack_dir, param_map);
1775 /* Count the register params and add them to the number of Projs for the RegParams node */
1776 for (i = 0; i < n_params; ++i) {
1777 be_abi_call_arg_t *arg = get_call_arg(call, 0, i);
1778 if (arg->in_reg && args[i]) {
1779 assert(arg->reg != sp && "cannot use stack pointer as parameter register");
1780 assert(i == get_Proj_proj(args[i]));
1782 /* For now, associate the register with the old Proj from Start representing that argument. */
1783 pmap_insert(env->regs, (void *) arg->reg, args[i]);
1784 DBG((dbg, LEVEL_2, "\targ #%d -> reg %s\n", i, arg->reg->name));
1788 /* Collect all callee-save registers */
1789 for (i = 0, n = arch_env_get_n_reg_class(arch_env); i < n; ++i) {
1790 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
1791 for (j = 0; j < cls->n_regs; ++j) {
1792 const arch_register_t *reg = &cls->regs[j];
1793 if (arch_register_type_is(reg, callee_save) ||
1794 arch_register_type_is(reg, state)) {
1795 pmap_insert(env->regs, (void *) reg, NULL);
1800 pmap_insert(env->regs, (void *) sp, NULL);
1801 pmap_insert(env->regs, (void *) arch_env->bp, NULL);
1802 reg_params_bl = get_irg_start_block(irg);
1803 env->reg_params = be_new_RegParams(irg, reg_params_bl, pmap_count(env->regs));
1804 add_irn_dep(env->reg_params, get_irg_start(irg));
1807 * make proj nodes for the callee save registers.
1808 * memorize them, since Return nodes get those as inputs.
1810 * Note, that if a register corresponds to an argument, the regs map contains
1811 * the old Proj from start for that argument.
1814 rm = reg_map_to_arr(&env->obst, env->regs);
1815 for (i = 0, n = pmap_count(env->regs); i < n; ++i) {
1816 arch_register_t *reg = (void *) rm[i].reg;
1817 ir_mode *mode = reg->reg_class->mode;
1819 arch_register_req_type_t add_type = 0;
1823 add_type |= arch_register_req_type_produces_sp | arch_register_req_type_ignore;
1826 proj = new_r_Proj(irg, reg_params_bl, env->reg_params, mode, nr);
1827 pmap_insert(env->regs, (void *) reg, proj);
1828 be_set_constr_single_reg_out(env->reg_params, nr, reg, add_type);
1829 arch_set_irn_register(proj, reg);
1831 DBG((dbg, LEVEL_2, "\tregister save proj #%d -> reg %s\n", nr, reg->name));
1833 obstack_free(&env->obst, rm);
1835 /* create a new initial memory proj */
1836 assert(is_Proj(old_mem));
1837 new_mem_proj = new_r_Proj(irg, get_nodes_block(old_mem),
1838 new_r_Unknown(irg, mode_T), mode_M,
1839 get_Proj_proj(old_mem));
1842 /* Generate the Prologue */
1843 fp_reg = call->cb->prologue(env->cb, &mem, env->regs, &env->frame.initial_bias);
1845 /* do the stack allocation BEFORE the barrier, or spill code
1846 might be added before it */
1847 env->init_sp = be_abi_reg_map_get(env->regs, sp);
1848 start_bl = get_irg_start_block(irg);
1849 env->init_sp = be_new_IncSP(sp, irg, start_bl, env->init_sp, BE_STACK_FRAME_SIZE_EXPAND, 0);
1850 be_abi_reg_map_set(env->regs, sp, env->init_sp);
1852 create_barrier(env, start_bl, &mem, env->regs, 0);
1854 env->init_sp = be_abi_reg_map_get(env->regs, sp);
1855 arch_set_irn_register(env->init_sp, sp);
1857 frame_pointer = be_abi_reg_map_get(env->regs, fp_reg);
1858 set_irg_frame(irg, frame_pointer);
1859 pset_insert_ptr(env->ignore_regs, fp_reg);
1861 /* rewire old mem users to new mem */
1862 set_Proj_pred(new_mem_proj, get_Proj_pred(old_mem));
1863 exchange(old_mem, mem);
1865 set_irg_initial_mem(irg, mem);
1867 /* Now, introduce stack param nodes for all parameters passed on the stack */
1868 for (i = 0; i < n_params; ++i) {
1869 ir_node *arg_proj = args[i];
1870 ir_node *repl = NULL;
1872 if (arg_proj != NULL) {
1873 be_abi_call_arg_t *arg;
1874 ir_type *param_type;
1875 int nr = get_Proj_proj(arg_proj);
1878 nr = MIN(nr, n_params);
1879 arg = get_call_arg(call, 0, nr);
1880 param_type = get_method_param_type(method_type, nr);
1883 repl = pmap_get(env->regs, (void *) arg->reg);
1884 } else if (arg->on_stack) {
1885 ir_node *addr = be_new_FrameAddr(sp->reg_class, irg, reg_params_bl, frame_pointer, arg->stack_ent);
1887 /* For atomic parameters which are actually used, we create a Load node. */
1888 if (is_atomic_type(param_type) && get_irn_n_edges(args[i]) > 0) {
1889 ir_mode *mode = get_type_mode(param_type);
1890 ir_mode *load_mode = arg->load_mode;
1892 ir_node *load = new_r_Load(irg, reg_params_bl, new_NoMem(), addr, load_mode, cons_floats);
1893 repl = new_r_Proj(irg, reg_params_bl, load, load_mode, pn_Load_res);
1895 if (mode != load_mode) {
1896 repl = new_r_Conv(irg, reg_params_bl, repl, mode);
1899 /* The stack parameter is not primitive (it is a struct or array),
1900 * we thus will create a node representing the parameter's address
1906 assert(repl != NULL);
1908 /* Beware: the mode of the register parameters is always the mode of the register class
1909 which may be wrong. Add Conv's then. */
1910 mode = get_irn_mode(args[i]);
1911 if (mode != get_irn_mode(repl)) {
1912 repl = new_r_Conv(irg, get_irn_n(repl, -1), repl, mode);
1914 exchange(args[i], repl);
1918 /* the arg proj is not needed anymore now and should be only used by the anchor */
1919 assert(get_irn_n_edges(arg_tuple) == 1);
1920 kill_node(arg_tuple);
1921 set_irg_args(irg, new_r_Bad(irg));
1923 /* All Return nodes hang on the End node, so look for them there. */
1924 end = get_irg_end_block(irg);
1925 for (i = 0, n = get_Block_n_cfgpreds(end); i < n; ++i) {
1926 ir_node *irn = get_Block_cfgpred(end, i);
1928 if (is_Return(irn)) {
1929 ir_node *blk = get_nodes_block(irn);
1930 ir_node *mem = get_Return_mem(irn);
1931 ir_node *ret = create_be_return(env, irn, blk, mem, get_Return_n_ress(irn));
1935 /* if we have endless loops here, n might be <= 0. Do NOT create a be_Return then,
1936 the code is dead and will never be executed. */
1938 obstack_free(&env->obst, args);
1940 /* handle start block here (place a jump in the block) */
1941 fix_start_block(irg);
1944 /** Fix the state inputs of calls that still hang on unknowns */
1946 void fix_call_state_inputs(be_abi_irg_t *env)
1948 const arch_env_t *arch_env = env->arch_env;
1950 arch_register_t **stateregs = NEW_ARR_F(arch_register_t*, 0);
1952 /* Collect caller save registers */
1953 n = arch_env_get_n_reg_class(arch_env);
1954 for (i = 0; i < n; ++i) {
1956 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
1957 for (j = 0; j < cls->n_regs; ++j) {
1958 const arch_register_t *reg = arch_register_for_index(cls, j);
1959 if (arch_register_type_is(reg, state)) {
1960 ARR_APP1(arch_register_t*, stateregs, (arch_register_t *)reg);
1965 n = ARR_LEN(env->calls);
1966 n_states = ARR_LEN(stateregs);
1967 for (i = 0; i < n; ++i) {
1969 ir_node *call = env->calls[i];
1971 arity = get_irn_arity(call);
1973 /* the state reg inputs are the last n inputs of the calls */
1974 for (s = 0; s < n_states; ++s) {
1975 int inp = arity - n_states + s;
1976 const arch_register_t *reg = stateregs[s];
1977 ir_node *regnode = be_abi_reg_map_get(env->regs, reg);
1979 set_irn_n(call, inp, regnode);
1983 DEL_ARR_F(stateregs);
1987 * Create a trampoline entity for the given method.
1989 static ir_entity *create_trampoline(be_main_env_t *be, ir_entity *method)
1991 ir_type *type = get_entity_type(method);
1992 ident *old_id = get_entity_ld_ident(method);
1993 ident *id = id_mangle3("L", old_id, "$stub");
1994 ir_type *parent = be->pic_trampolines_type;
1995 ir_entity *ent = new_entity(parent, old_id, type);
1996 set_entity_ld_ident(ent, id);
1997 set_entity_visibility(ent, visibility_local);
1998 set_entity_variability(ent, variability_uninitialized);
2004 * Returns the trampoline entity for the given method.
2006 static ir_entity *get_trampoline(be_main_env_t *env, ir_entity *method)
2008 ir_entity *result = pmap_get(env->ent_trampoline_map, method);
2009 if (result == NULL) {
2010 result = create_trampoline(env, method);
2011 pmap_insert(env->ent_trampoline_map, method, result);
2017 static ir_entity *create_pic_symbol(be_main_env_t *be, ir_entity *entity)
2019 ident *old_id = get_entity_ld_ident(entity);
2020 ident *id = id_mangle3("L", old_id, "$non_lazy_ptr");
2021 ir_type *e_type = get_entity_type(entity);
2022 ir_type *type = new_type_pointer(id, e_type, mode_P_data);
2023 ir_type *parent = be->pic_symbols_type;
2024 ir_entity *ent = new_entity(parent, old_id, type);
2025 set_entity_ld_ident(ent, id);
2026 set_entity_visibility(ent, visibility_local);
2027 set_entity_variability(ent, variability_uninitialized);
2032 static ir_entity *get_pic_symbol(be_main_env_t *env, ir_entity *entity)
2034 ir_entity *result = pmap_get(env->ent_pic_symbol_map, entity);
2035 if (result == NULL) {
2036 result = create_pic_symbol(env, entity);
2037 pmap_insert(env->ent_pic_symbol_map, entity, result);
2046 * Returns non-zero if a given entity can be accessed using a relative address.
2048 static int can_address_relative(ir_entity *entity)
2050 return get_entity_variability(entity) == variability_initialized
2051 || get_entity_visibility(entity) == visibility_local;
2054 /** patches SymConsts to work in position independent code */
2055 static void fix_pic_symconsts(ir_node *node, void *data)
2065 be_abi_irg_t *env = data;
2067 be_main_env_t *be = env->birg->main_env;
2069 arity = get_irn_arity(node);
2070 for (i = 0; i < arity; ++i) {
2072 ir_node *pred = get_irn_n(node, i);
2074 ir_entity *pic_symbol;
2075 ir_node *pic_symconst;
2077 if (!is_SymConst(pred))
2080 entity = get_SymConst_entity(pred);
2081 block = get_nodes_block(pred);
2082 irg = get_irn_irg(pred);
2084 /* calls can jump to relative addresses, so we can directly jump to
2085 the (relatively) known call address or the trampoline */
2086 if (i == 1 && is_Call(node)) {
2087 ir_entity *trampoline;
2088 ir_node *trampoline_const;
2090 if (can_address_relative(entity))
2093 dbgi = get_irn_dbg_info(pred);
2094 trampoline = get_trampoline(be, entity);
2095 trampoline_const = new_rd_SymConst_addr_ent(dbgi, irg, mode_P_code,
2097 set_irn_n(node, i, trampoline_const);
2101 /* everything else is accessed relative to EIP */
2102 mode = get_irn_mode(pred);
2103 unknown = new_r_Unknown(irg, mode);
2104 pic_base = arch_code_generator_get_pic_base(env->birg->cg);
2106 /* all ok now for locally constructed stuff */
2107 if (can_address_relative(entity)) {
2108 ir_node *add = new_r_Add(irg, block, pic_base, pred, mode);
2110 /* make sure the walker doesn't visit this add again */
2111 mark_irn_visited(add);
2112 set_irn_n(node, i, add);
2116 /* get entry from pic symbol segment */
2117 dbgi = get_irn_dbg_info(pred);
2118 pic_symbol = get_pic_symbol(be, entity);
2119 pic_symconst = new_rd_SymConst_addr_ent(dbgi, irg, mode_P_code,
2121 add = new_r_Add(irg, block, pic_base, pic_symconst, mode);
2122 mark_irn_visited(add);
2124 /* we need an extra indirection for global data outside our current
2125 module. The loads are always safe and can therefore float
2126 and need no memory input */
2127 load = new_r_Load(irg, block, new_NoMem(), add, mode, cons_floats);
2128 load_res = new_r_Proj(irg, block, load, mode, pn_Load_res);
2130 set_irn_n(node, i, load_res);
2134 be_abi_irg_t *be_abi_introduce(be_irg_t *birg)
2136 be_abi_irg_t *env = XMALLOC(be_abi_irg_t);
2137 ir_node *old_frame = get_irg_frame(birg->irg);
2138 ir_graph *irg = birg->irg;
2142 optimization_state_t state;
2143 unsigned *limited_bitset;
2145 be_omit_fp = birg->main_env->options->omit_fp;
2146 be_omit_leaf_fp = birg->main_env->options->omit_leaf_fp;
2148 obstack_init(&env->obst);
2150 env->arch_env = birg->main_env->arch_env;
2151 env->method_type = get_entity_type(get_irg_entity(irg));
2152 env->call = be_abi_call_new(env->arch_env->sp->reg_class);
2153 arch_env_get_call_abi(env->arch_env, env->method_type, env->call);
2155 env->ignore_regs = pset_new_ptr_default();
2156 env->keep_map = pmap_create();
2157 env->dce_survivor = new_survive_dce();
2160 env->sp_req.type = arch_register_req_type_limited;
2161 env->sp_req.cls = arch_register_get_class(env->arch_env->sp);
2162 limited_bitset = rbitset_obstack_alloc(&env->obst, env->sp_req.cls->n_regs);
2163 rbitset_set(limited_bitset, arch_register_get_index(env->arch_env->sp));
2164 env->sp_req.limited = limited_bitset;
2165 if (env->arch_env->sp->type & arch_register_type_ignore) {
2166 env->sp_req.type |= arch_register_req_type_ignore;
2169 env->sp_cls_req.type = arch_register_req_type_normal;
2170 env->sp_cls_req.cls = arch_register_get_class(env->arch_env->sp);
2172 /* Beware: later we replace this node by the real one, ensure it is not CSE'd
2173 to another Unknown or the stack pointer gets used */
2174 save_optimization_state(&state);
2176 env->init_sp = dummy = new_r_Unknown(irg, env->arch_env->sp->reg_class->mode);
2177 restore_optimization_state(&state);
2179 FIRM_DBG_REGISTER(env->dbg, "firm.be.abi");
2181 env->calls = NEW_ARR_F(ir_node*, 0);
2183 if (birg->main_env->options->pic) {
2184 irg_walk_graph(irg, fix_pic_symconsts, NULL, env);
2187 /* Lower all call nodes in the IRG. */
2191 Beware: init backend abi call object after processing calls,
2192 otherwise some information might be not yet available.
2194 env->cb = env->call->cb->init(env->call, birg->main_env->arch_env, irg);
2196 /* Process the IRG */
2199 /* fix call inputs for state registers */
2200 fix_call_state_inputs(env);
2202 /* We don't need the keep map anymore. */
2203 pmap_destroy(env->keep_map);
2204 env->keep_map = NULL;
2206 /* calls array is not needed anymore */
2207 DEL_ARR_F(env->calls);
2210 /* reroute the stack origin of the calls to the true stack origin. */
2211 exchange(dummy, env->init_sp);
2212 exchange(old_frame, get_irg_frame(irg));
2214 /* Make some important node pointers survive the dead node elimination. */
2215 survive_dce_register_irn(env->dce_survivor, &env->init_sp);
2216 foreach_pmap(env->regs, ent) {
2217 survive_dce_register_irn(env->dce_survivor, (ir_node **) &ent->value);
2220 env->call->cb->done(env->cb);
2225 void be_abi_free(be_abi_irg_t *env)
2227 be_abi_call_free(env->call);
2228 free_survive_dce(env->dce_survivor);
2229 del_pset(env->ignore_regs);
2230 pmap_destroy(env->regs);
2231 obstack_free(&env->obst, NULL);
2235 void be_abi_put_ignore_regs(be_abi_irg_t *abi, const arch_register_class_t *cls, bitset_t *bs)
2237 arch_register_t *reg;
2239 for (reg = pset_first(abi->ignore_regs); reg; reg = pset_next(abi->ignore_regs))
2240 if (reg->reg_class == cls)
2241 bitset_set(bs, reg->index);
2244 void be_abi_set_non_ignore_regs(be_abi_irg_t *abi, const arch_register_class_t *cls, unsigned *raw_bitset)
2247 arch_register_t *reg;
2249 for (i = 0; i < cls->n_regs; ++i) {
2250 if (arch_register_type_is(&cls->regs[i], ignore))
2253 rbitset_set(raw_bitset, i);
2256 for (reg = pset_first(abi->ignore_regs); reg != NULL;
2257 reg = pset_next(abi->ignore_regs)) {
2258 if (reg->reg_class != cls)
2261 rbitset_clear(raw_bitset, reg->index);
2265 /* Returns the stack layout from a abi environment. */
2266 const be_stack_layout_t *be_abi_get_stack_layout(const be_abi_irg_t *abi)
2274 | ___(_)_ __ / ___|| |_ __ _ ___| | __
2275 | |_ | \ \/ / \___ \| __/ _` |/ __| |/ /
2276 | _| | |> < ___) | || (_| | (__| <
2277 |_| |_/_/\_\ |____/ \__\__,_|\___|_|\_\
2281 typedef ir_node **node_array;
2283 typedef struct fix_stack_walker_env_t {
2284 node_array sp_nodes;
2285 } fix_stack_walker_env_t;
2288 * Walker. Collect all stack modifying nodes.
2290 static void collect_stack_nodes_walker(ir_node *node, void *data)
2292 fix_stack_walker_env_t *env = data;
2293 const arch_register_req_t *req;
2295 if (get_irn_mode(node) == mode_T)
2298 req = arch_get_register_req_out(node);
2299 if (! (req->type & arch_register_req_type_produces_sp))
2302 ARR_APP1(ir_node*, env->sp_nodes, node);
2305 void be_abi_fix_stack_nodes(be_abi_irg_t *env)
2307 be_ssa_construction_env_t senv;
2310 be_irg_t *birg = env->birg;
2311 be_lv_t *lv = be_get_birg_liveness(birg);
2312 fix_stack_walker_env_t walker_env;
2314 walker_env.sp_nodes = NEW_ARR_F(ir_node*, 0);
2316 irg_walk_graph(birg->irg, collect_stack_nodes_walker, NULL, &walker_env);
2318 /* nothing to be done if we didn't find any node, in fact we mustn't
2319 * continue, as for endless loops incsp might have had no users and is bad
2322 len = ARR_LEN(walker_env.sp_nodes);
2324 DEL_ARR_F(walker_env.sp_nodes);
2328 be_ssa_construction_init(&senv, birg);
2329 be_ssa_construction_add_copies(&senv, walker_env.sp_nodes,
2330 ARR_LEN(walker_env.sp_nodes));
2331 be_ssa_construction_fix_users_array(&senv, walker_env.sp_nodes,
2332 ARR_LEN(walker_env.sp_nodes));
2335 len = ARR_LEN(walker_env.sp_nodes);
2336 for (i = 0; i < len; ++i) {
2337 be_liveness_update(lv, walker_env.sp_nodes[i]);
2339 be_ssa_construction_update_liveness_phis(&senv, lv);
2342 phis = be_ssa_construction_get_new_phis(&senv);
2344 /* set register requirements for stack phis */
2345 len = ARR_LEN(phis);
2346 for (i = 0; i < len; ++i) {
2347 ir_node *phi = phis[i];
2348 be_set_phi_reg_req(phi, &env->sp_req, arch_register_req_type_produces_sp);
2349 arch_set_irn_register(phi, env->arch_env->sp);
2351 be_ssa_construction_destroy(&senv);
2353 DEL_ARR_F(walker_env.sp_nodes);
2357 * Fix all stack accessing operations in the block bl.
2359 * @param env the abi environment
2360 * @param bl the block to process
2361 * @param real_bias the bias value
2363 * @return the bias at the end of this block
2365 static int process_stack_bias(be_abi_irg_t *env, ir_node *bl, int real_bias)
2367 int omit_fp = env->call->flags.bits.try_omit_fp;
2369 int wanted_bias = real_bias;
2371 sched_foreach(bl, irn) {
2375 Check, if the node relates to an entity on the stack frame.
2376 If so, set the true offset (including the bias) for that
2379 ir_entity *ent = arch_get_frame_entity(irn);
2381 int bias = omit_fp ? real_bias : 0;
2382 int offset = get_stack_entity_offset(&env->frame, ent, bias);
2383 arch_set_frame_offset(irn, offset);
2384 DBG((env->dbg, LEVEL_2, "%F has offset %d (including bias %d)\n",
2385 ent, offset, bias));
2389 * If the node modifies the stack pointer by a constant offset,
2390 * record that in the bias.
2392 ofs = arch_get_sp_bias(irn);
2394 if (be_is_IncSP(irn)) {
2395 /* fill in real stack frame size */
2396 if (ofs == BE_STACK_FRAME_SIZE_EXPAND) {
2397 ir_type *frame_type = get_irg_frame_type(env->birg->irg);
2398 ofs = (int) get_type_size_bytes(frame_type);
2399 be_set_IncSP_offset(irn, ofs);
2400 } else if (ofs == BE_STACK_FRAME_SIZE_SHRINK) {
2401 ir_type *frame_type = get_irg_frame_type(env->birg->irg);
2402 ofs = - (int)get_type_size_bytes(frame_type);
2403 be_set_IncSP_offset(irn, ofs);
2405 if (be_get_IncSP_align(irn)) {
2406 /* patch IncSP to produce an aligned stack pointer */
2407 ir_type *between_type = env->frame.between_type;
2408 int between_size = get_type_size_bytes(between_type);
2409 int alignment = 1 << env->arch_env->stack_alignment;
2410 int delta = (real_bias + ofs + between_size) & (alignment - 1);
2413 be_set_IncSP_offset(irn, ofs + alignment - delta);
2414 real_bias += alignment - delta;
2417 /* adjust so real_bias corresponds with wanted_bias */
2418 int delta = wanted_bias - real_bias;
2421 be_set_IncSP_offset(irn, ofs + delta);
2432 assert(real_bias == wanted_bias);
2437 * A helper struct for the bias walker.
2440 be_abi_irg_t *env; /**< The ABI irg environment. */
2441 int start_block_bias; /**< The bias at the end of the start block. */
2443 ir_node *start_block; /**< The start block of the current graph. */
2447 * Block-Walker: fix all stack offsets for all blocks
2448 * except the start block
2450 static void stack_bias_walker(ir_node *bl, void *data)
2452 struct bias_walk *bw = data;
2453 if (bl != bw->start_block) {
2454 process_stack_bias(bw->env, bl, bw->start_block_bias);
2458 void be_abi_fix_stack_bias(be_abi_irg_t *env)
2460 ir_graph *irg = env->birg->irg;
2461 struct bias_walk bw;
2463 stack_frame_compute_initial_offset(&env->frame);
2464 // stack_layout_dump(stdout, frame);
2466 /* Determine the stack bias at the end of the start block. */
2467 bw.start_block_bias = process_stack_bias(env, get_irg_start_block(irg), env->frame.initial_bias);
2468 bw.between_size = get_type_size_bytes(env->frame.between_type);
2470 /* fix the bias is all other blocks */
2472 bw.start_block = get_irg_start_block(irg);
2473 irg_block_walk_graph(irg, stack_bias_walker, NULL, &bw);
2476 ir_node *be_abi_get_callee_save_irn(be_abi_irg_t *abi, const arch_register_t *reg)
2478 assert(arch_register_type_is(reg, callee_save));
2479 assert(pmap_contains(abi->regs, (void *) reg));
2480 return pmap_get(abi->regs, (void *) reg);
2483 ir_node *be_abi_get_ignore_irn(be_abi_irg_t *abi, const arch_register_t *reg)
2485 assert(arch_register_type_is(reg, ignore));
2486 assert(pmap_contains(abi->regs, (void *) reg));
2487 return pmap_get(abi->regs, (void *) reg);
2491 * Returns non-zero if the ABI has omitted the frame pointer in
2492 * the current graph.
2494 int be_abi_omit_fp(const be_abi_irg_t *abi)
2496 return abi->call->flags.bits.try_omit_fp;