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 bitset_t *used_proj_nr;
1714 DEBUG_ONLY(firm_dbg_module_t *dbg = env->dbg;)
1716 DBG((dbg, LEVEL_1, "introducing abi on %+F\n", irg));
1718 /* Must fetch memory here, otherwise the start Barrier gets the wrong
1719 * memory, which leads to loops in the DAG. */
1720 old_mem = get_irg_initial_mem(irg);
1722 irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
1723 /* set the links of all frame entities to NULL, we use it
1724 to detect if an entity is already linked in the value_param_list */
1725 tp = get_method_value_param_type(method_type);
1727 for (i = get_struct_n_members(tp) - 1; i >= 0; --i)
1728 set_entity_link(get_struct_member(tp, i), NULL);
1731 /* Convert the Sel nodes in the irg to frame load/store/addr nodes. */
1733 ctx.value_param_list = NULL;
1734 ctx.value_param_tail = NULL;
1735 irg_walk_graph(irg, lower_frame_sels_walker, NULL, &ctx);
1737 /* value_param_base anchor is not needed anymore now */
1738 value_param_base = get_irg_value_param_base(irg);
1739 kill_node(value_param_base);
1740 set_irg_value_param_base(irg, new_r_Bad(irg));
1742 env->regs = pmap_create();
1744 used_proj_nr = bitset_alloca(1024);
1745 n_params = get_method_n_params(method_type);
1746 args = obstack_alloc(&env->obst, n_params * sizeof(args[0]));
1747 memset(args, 0, n_params * sizeof(args[0]));
1749 /* Check if a value parameter is transmitted as a register.
1750 * This might happen if the address of an parameter is taken which is
1751 * transmitted in registers.
1753 * Note that on some architectures this case must be handled specially
1754 * because the place of the backing store is determined by their ABI.
1756 * In the default case we move the entity to the frame type and create
1757 * a backing store into the first block.
1759 fix_address_of_parameter_access(env, ctx.value_param_list);
1760 irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
1762 /* Fill the argument vector */
1763 arg_tuple = get_irg_args(irg);
1764 foreach_out_edge(arg_tuple, edge) {
1765 ir_node *irn = get_edge_src_irn(edge);
1766 if (! is_Anchor(irn)) {
1767 int nr = get_Proj_proj(irn);
1769 DBG((dbg, LEVEL_2, "\treading arg: %d -> %+F\n", nr, irn));
1773 arg_type = compute_arg_type(env, call, method_type, ¶m_map);
1774 bet_type = call->cb->get_between_type(env->cb);
1775 stack_frame_init(&env->frame, arg_type, bet_type, get_irg_frame_type(irg), arch_env->stack_dir, param_map);
1777 /* Count the register params and add them to the number of Projs for the RegParams node */
1778 for (i = 0; i < n_params; ++i) {
1779 be_abi_call_arg_t *arg = get_call_arg(call, 0, i);
1780 if (arg->in_reg && args[i]) {
1781 assert(arg->reg != sp && "cannot use stack pointer as parameter register");
1782 assert(i == get_Proj_proj(args[i]));
1784 /* For now, associate the register with the old Proj from Start representing that argument. */
1785 pmap_insert(env->regs, (void *) arg->reg, args[i]);
1786 bitset_set(used_proj_nr, i);
1787 DBG((dbg, LEVEL_2, "\targ #%d -> reg %s\n", i, arg->reg->name));
1791 /* Collect all callee-save registers */
1792 for (i = 0, n = arch_env_get_n_reg_class(arch_env); i < n; ++i) {
1793 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
1794 for (j = 0; j < cls->n_regs; ++j) {
1795 const arch_register_t *reg = &cls->regs[j];
1796 if (arch_register_type_is(reg, callee_save) ||
1797 arch_register_type_is(reg, state)) {
1798 pmap_insert(env->regs, (void *) reg, NULL);
1803 pmap_insert(env->regs, (void *) sp, NULL);
1804 pmap_insert(env->regs, (void *) arch_env->bp, NULL);
1805 reg_params_bl = get_irg_start_block(irg);
1806 env->reg_params = be_new_RegParams(irg, reg_params_bl, pmap_count(env->regs));
1807 add_irn_dep(env->reg_params, get_irg_start(irg));
1810 * make proj nodes for the callee save registers.
1811 * memorize them, since Return nodes get those as inputs.
1813 * Note, that if a register corresponds to an argument, the regs map contains
1814 * the old Proj from start for that argument.
1817 rm = reg_map_to_arr(&env->obst, env->regs);
1818 for (i = 0, n = pmap_count(env->regs); i < n; ++i) {
1819 arch_register_t *reg = (void *) rm[i].reg;
1820 ir_mode *mode = reg->reg_class->mode;
1822 arch_register_req_type_t add_type = 0;
1826 add_type |= arch_register_req_type_produces_sp | arch_register_req_type_ignore;
1829 bitset_set(used_proj_nr, nr);
1830 proj = new_r_Proj(irg, reg_params_bl, env->reg_params, mode, nr);
1831 pmap_insert(env->regs, (void *) reg, proj);
1832 be_set_constr_single_reg_out(env->reg_params, nr, reg, add_type);
1833 arch_set_irn_register(proj, reg);
1835 DBG((dbg, LEVEL_2, "\tregister save proj #%d -> reg %s\n", nr, reg->name));
1837 obstack_free(&env->obst, rm);
1839 /* create a new initial memory proj */
1840 assert(is_Proj(old_mem));
1841 new_mem_proj = new_r_Proj(irg, get_nodes_block(old_mem),
1842 new_r_Unknown(irg, mode_T), mode_M,
1843 get_Proj_proj(old_mem));
1846 /* Generate the Prologue */
1847 fp_reg = call->cb->prologue(env->cb, &mem, env->regs, &env->frame.initial_bias);
1849 /* do the stack allocation BEFORE the barrier, or spill code
1850 might be added before it */
1851 env->init_sp = be_abi_reg_map_get(env->regs, sp);
1852 start_bl = get_irg_start_block(irg);
1853 env->init_sp = be_new_IncSP(sp, irg, start_bl, env->init_sp, BE_STACK_FRAME_SIZE_EXPAND, 0);
1854 be_abi_reg_map_set(env->regs, sp, env->init_sp);
1856 create_barrier(env, start_bl, &mem, env->regs, 0);
1858 env->init_sp = be_abi_reg_map_get(env->regs, sp);
1859 arch_set_irn_register(env->init_sp, sp);
1861 frame_pointer = be_abi_reg_map_get(env->regs, fp_reg);
1862 set_irg_frame(irg, frame_pointer);
1863 pset_insert_ptr(env->ignore_regs, fp_reg);
1865 /* rewire old mem users to new mem */
1866 set_Proj_pred(new_mem_proj, get_Proj_pred(old_mem));
1867 exchange(old_mem, mem);
1869 set_irg_initial_mem(irg, mem);
1871 /* Now, introduce stack param nodes for all parameters passed on the stack */
1872 for (i = 0; i < n_params; ++i) {
1873 ir_node *arg_proj = args[i];
1874 ir_node *repl = NULL;
1876 if (arg_proj != NULL) {
1877 be_abi_call_arg_t *arg;
1878 ir_type *param_type;
1879 int nr = get_Proj_proj(arg_proj);
1882 nr = MIN(nr, n_params);
1883 arg = get_call_arg(call, 0, nr);
1884 param_type = get_method_param_type(method_type, nr);
1887 repl = pmap_get(env->regs, (void *) arg->reg);
1888 } else if (arg->on_stack) {
1889 ir_node *addr = be_new_FrameAddr(sp->reg_class, irg, reg_params_bl, frame_pointer, arg->stack_ent);
1891 /* For atomic parameters which are actually used, we create a Load node. */
1892 if (is_atomic_type(param_type) && get_irn_n_edges(args[i]) > 0) {
1893 ir_mode *mode = get_type_mode(param_type);
1894 ir_mode *load_mode = arg->load_mode;
1896 ir_node *load = new_r_Load(irg, reg_params_bl, new_NoMem(), addr, load_mode, cons_floats);
1897 repl = new_r_Proj(irg, reg_params_bl, load, load_mode, pn_Load_res);
1899 if (mode != load_mode) {
1900 repl = new_r_Conv(irg, reg_params_bl, repl, mode);
1903 /* The stack parameter is not primitive (it is a struct or array),
1904 * we thus will create a node representing the parameter's address
1910 assert(repl != NULL);
1912 /* Beware: the mode of the register parameters is always the mode of the register class
1913 which may be wrong. Add Conv's then. */
1914 mode = get_irn_mode(args[i]);
1915 if (mode != get_irn_mode(repl)) {
1916 repl = new_r_Conv(irg, get_irn_n(repl, -1), repl, mode);
1918 exchange(args[i], repl);
1922 /* the arg proj is not needed anymore now and should be only used by the anchor */
1923 assert(get_irn_n_edges(arg_tuple) == 1);
1924 kill_node(arg_tuple);
1925 set_irg_args(irg, new_r_Bad(irg));
1927 /* All Return nodes hang on the End node, so look for them there. */
1928 end = get_irg_end_block(irg);
1929 for (i = 0, n = get_Block_n_cfgpreds(end); i < n; ++i) {
1930 ir_node *irn = get_Block_cfgpred(end, i);
1932 if (is_Return(irn)) {
1933 ir_node *blk = get_nodes_block(irn);
1934 ir_node *mem = get_Return_mem(irn);
1935 ir_node *ret = create_be_return(env, irn, blk, mem, get_Return_n_ress(irn));
1939 /* if we have endless loops here, n might be <= 0. Do NOT create a be_Return then,
1940 the code is dead and will never be executed. */
1942 obstack_free(&env->obst, args);
1944 /* handle start block here (place a jump in the block) */
1945 fix_start_block(irg);
1948 /** Fix the state inputs of calls that still hang on unknowns */
1950 void fix_call_state_inputs(be_abi_irg_t *env)
1952 const arch_env_t *arch_env = env->arch_env;
1954 arch_register_t **stateregs = NEW_ARR_F(arch_register_t*, 0);
1956 /* Collect caller save registers */
1957 n = arch_env_get_n_reg_class(arch_env);
1958 for (i = 0; i < n; ++i) {
1960 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
1961 for (j = 0; j < cls->n_regs; ++j) {
1962 const arch_register_t *reg = arch_register_for_index(cls, j);
1963 if (arch_register_type_is(reg, state)) {
1964 ARR_APP1(arch_register_t*, stateregs, (arch_register_t *)reg);
1969 n = ARR_LEN(env->calls);
1970 n_states = ARR_LEN(stateregs);
1971 for (i = 0; i < n; ++i) {
1973 ir_node *call = env->calls[i];
1975 arity = get_irn_arity(call);
1977 /* the state reg inputs are the last n inputs of the calls */
1978 for (s = 0; s < n_states; ++s) {
1979 int inp = arity - n_states + s;
1980 const arch_register_t *reg = stateregs[s];
1981 ir_node *regnode = be_abi_reg_map_get(env->regs, reg);
1983 set_irn_n(call, inp, regnode);
1987 DEL_ARR_F(stateregs);
1991 * Create a trampoline entity for the given method.
1993 static ir_entity *create_trampoline(be_main_env_t *be, ir_entity *method)
1995 ir_type *type = get_entity_type(method);
1996 ident *old_id = get_entity_ld_ident(method);
1997 ident *id = id_mangle3("L", old_id, "$stub");
1998 ir_type *parent = be->pic_trampolines_type;
1999 ir_entity *ent = new_entity(parent, old_id, type);
2000 set_entity_ld_ident(ent, id);
2001 set_entity_visibility(ent, visibility_local);
2002 set_entity_variability(ent, variability_uninitialized);
2008 * Returns the trampoline entity for the given method.
2010 static ir_entity *get_trampoline(be_main_env_t *env, ir_entity *method)
2012 ir_entity *result = pmap_get(env->ent_trampoline_map, method);
2013 if (result == NULL) {
2014 result = create_trampoline(env, method);
2015 pmap_insert(env->ent_trampoline_map, method, result);
2021 static ir_entity *create_pic_symbol(be_main_env_t *be, ir_entity *entity)
2023 ident *old_id = get_entity_ld_ident(entity);
2024 ident *id = id_mangle3("L", old_id, "$non_lazy_ptr");
2025 ir_type *e_type = get_entity_type(entity);
2026 ir_type *type = new_type_pointer(id, e_type, mode_P_data);
2027 ir_type *parent = be->pic_symbols_type;
2028 ir_entity *ent = new_entity(parent, old_id, type);
2029 set_entity_ld_ident(ent, id);
2030 set_entity_visibility(ent, visibility_local);
2031 set_entity_variability(ent, variability_uninitialized);
2036 static ir_entity *get_pic_symbol(be_main_env_t *env, ir_entity *entity)
2038 ir_entity *result = pmap_get(env->ent_pic_symbol_map, entity);
2039 if (result == NULL) {
2040 result = create_pic_symbol(env, entity);
2041 pmap_insert(env->ent_pic_symbol_map, entity, result);
2050 * Returns non-zero if a given entity can be accessed using a relative address.
2052 static int can_address_relative(ir_entity *entity)
2054 return get_entity_variability(entity) == variability_initialized
2055 || get_entity_visibility(entity) == visibility_local;
2058 /** patches SymConsts to work in position independent code */
2059 static void fix_pic_symconsts(ir_node *node, void *data)
2069 be_abi_irg_t *env = data;
2071 be_main_env_t *be = env->birg->main_env;
2073 arity = get_irn_arity(node);
2074 for (i = 0; i < arity; ++i) {
2076 ir_node *pred = get_irn_n(node, i);
2078 ir_entity *pic_symbol;
2079 ir_node *pic_symconst;
2081 if (!is_SymConst(pred))
2084 entity = get_SymConst_entity(pred);
2085 block = get_nodes_block(pred);
2086 irg = get_irn_irg(pred);
2088 /* calls can jump to relative addresses, so we can directly jump to
2089 the (relatively) known call address or the trampoline */
2090 if (i == 1 && is_Call(node)) {
2091 ir_entity *trampoline;
2092 ir_node *trampoline_const;
2094 if (can_address_relative(entity))
2097 dbgi = get_irn_dbg_info(pred);
2098 trampoline = get_trampoline(be, entity);
2099 trampoline_const = new_rd_SymConst_addr_ent(dbgi, irg, mode_P_code,
2101 set_irn_n(node, i, trampoline_const);
2105 /* everything else is accessed relative to EIP */
2106 mode = get_irn_mode(pred);
2107 unknown = new_r_Unknown(irg, mode);
2108 pic_base = arch_code_generator_get_pic_base(env->birg->cg);
2110 /* all ok now for locally constructed stuff */
2111 if (can_address_relative(entity)) {
2112 ir_node *add = new_r_Add(irg, block, pic_base, pred, mode);
2114 /* make sure the walker doesn't visit this add again */
2115 mark_irn_visited(add);
2116 set_irn_n(node, i, add);
2120 /* get entry from pic symbol segment */
2121 dbgi = get_irn_dbg_info(pred);
2122 pic_symbol = get_pic_symbol(be, entity);
2123 pic_symconst = new_rd_SymConst_addr_ent(dbgi, irg, mode_P_code,
2125 add = new_r_Add(irg, block, pic_base, pic_symconst, mode);
2126 mark_irn_visited(add);
2128 /* we need an extra indirection for global data outside our current
2129 module. The loads are always safe and can therefore float
2130 and need no memory input */
2131 load = new_r_Load(irg, block, new_NoMem(), add, mode, cons_floats);
2132 load_res = new_r_Proj(irg, block, load, mode, pn_Load_res);
2134 set_irn_n(node, i, load_res);
2138 be_abi_irg_t *be_abi_introduce(be_irg_t *birg)
2140 be_abi_irg_t *env = XMALLOC(be_abi_irg_t);
2141 ir_node *old_frame = get_irg_frame(birg->irg);
2142 ir_graph *irg = birg->irg;
2146 optimization_state_t state;
2147 unsigned *limited_bitset;
2149 be_omit_fp = birg->main_env->options->omit_fp;
2150 be_omit_leaf_fp = birg->main_env->options->omit_leaf_fp;
2152 obstack_init(&env->obst);
2154 env->arch_env = birg->main_env->arch_env;
2155 env->method_type = get_entity_type(get_irg_entity(irg));
2156 env->call = be_abi_call_new(env->arch_env->sp->reg_class);
2157 arch_env_get_call_abi(env->arch_env, env->method_type, env->call);
2159 env->ignore_regs = pset_new_ptr_default();
2160 env->keep_map = pmap_create();
2161 env->dce_survivor = new_survive_dce();
2164 env->sp_req.type = arch_register_req_type_limited;
2165 env->sp_req.cls = arch_register_get_class(env->arch_env->sp);
2166 limited_bitset = rbitset_obstack_alloc(&env->obst, env->sp_req.cls->n_regs);
2167 rbitset_set(limited_bitset, arch_register_get_index(env->arch_env->sp));
2168 env->sp_req.limited = limited_bitset;
2169 if (env->arch_env->sp->type & arch_register_type_ignore) {
2170 env->sp_req.type |= arch_register_req_type_ignore;
2173 env->sp_cls_req.type = arch_register_req_type_normal;
2174 env->sp_cls_req.cls = arch_register_get_class(env->arch_env->sp);
2176 /* Beware: later we replace this node by the real one, ensure it is not CSE'd
2177 to another Unknown or the stack pointer gets used */
2178 save_optimization_state(&state);
2180 env->init_sp = dummy = new_r_Unknown(irg, env->arch_env->sp->reg_class->mode);
2181 restore_optimization_state(&state);
2183 FIRM_DBG_REGISTER(env->dbg, "firm.be.abi");
2185 env->calls = NEW_ARR_F(ir_node*, 0);
2187 if (birg->main_env->options->pic) {
2188 irg_walk_graph(irg, fix_pic_symconsts, NULL, env);
2191 /* Lower all call nodes in the IRG. */
2195 Beware: init backend abi call object after processing calls,
2196 otherwise some information might be not yet available.
2198 env->cb = env->call->cb->init(env->call, birg->main_env->arch_env, irg);
2200 /* Process the IRG */
2203 /* fix call inputs for state registers */
2204 fix_call_state_inputs(env);
2206 /* We don't need the keep map anymore. */
2207 pmap_destroy(env->keep_map);
2208 env->keep_map = NULL;
2210 /* calls array is not needed anymore */
2211 DEL_ARR_F(env->calls);
2214 /* reroute the stack origin of the calls to the true stack origin. */
2215 exchange(dummy, env->init_sp);
2216 exchange(old_frame, get_irg_frame(irg));
2218 /* Make some important node pointers survive the dead node elimination. */
2219 survive_dce_register_irn(env->dce_survivor, &env->init_sp);
2220 foreach_pmap(env->regs, ent) {
2221 survive_dce_register_irn(env->dce_survivor, (ir_node **) &ent->value);
2224 env->call->cb->done(env->cb);
2229 void be_abi_free(be_abi_irg_t *env)
2231 be_abi_call_free(env->call);
2232 free_survive_dce(env->dce_survivor);
2233 del_pset(env->ignore_regs);
2234 pmap_destroy(env->regs);
2235 obstack_free(&env->obst, NULL);
2239 void be_abi_put_ignore_regs(be_abi_irg_t *abi, const arch_register_class_t *cls, bitset_t *bs)
2241 arch_register_t *reg;
2243 for (reg = pset_first(abi->ignore_regs); reg; reg = pset_next(abi->ignore_regs))
2244 if (reg->reg_class == cls)
2245 bitset_set(bs, reg->index);
2248 void be_abi_set_non_ignore_regs(be_abi_irg_t *abi, const arch_register_class_t *cls, unsigned *raw_bitset)
2251 arch_register_t *reg;
2253 for (i = 0; i < cls->n_regs; ++i) {
2254 if (arch_register_type_is(&cls->regs[i], ignore))
2257 rbitset_set(raw_bitset, i);
2260 for (reg = pset_first(abi->ignore_regs); reg != NULL;
2261 reg = pset_next(abi->ignore_regs)) {
2262 if (reg->reg_class != cls)
2265 rbitset_clear(raw_bitset, reg->index);
2269 /* Returns the stack layout from a abi environment. */
2270 const be_stack_layout_t *be_abi_get_stack_layout(const be_abi_irg_t *abi)
2278 | ___(_)_ __ / ___|| |_ __ _ ___| | __
2279 | |_ | \ \/ / \___ \| __/ _` |/ __| |/ /
2280 | _| | |> < ___) | || (_| | (__| <
2281 |_| |_/_/\_\ |____/ \__\__,_|\___|_|\_\
2285 typedef ir_node **node_array;
2287 typedef struct fix_stack_walker_env_t {
2288 node_array sp_nodes;
2289 } fix_stack_walker_env_t;
2292 * Walker. Collect all stack modifying nodes.
2294 static void collect_stack_nodes_walker(ir_node *node, void *data)
2296 fix_stack_walker_env_t *env = data;
2297 const arch_register_req_t *req;
2299 if (get_irn_mode(node) == mode_T)
2302 req = arch_get_register_req_out(node);
2303 if (! (req->type & arch_register_req_type_produces_sp))
2306 ARR_APP1(ir_node*, env->sp_nodes, node);
2309 void be_abi_fix_stack_nodes(be_abi_irg_t *env)
2311 be_ssa_construction_env_t senv;
2314 be_irg_t *birg = env->birg;
2315 be_lv_t *lv = be_get_birg_liveness(birg);
2316 fix_stack_walker_env_t walker_env;
2318 walker_env.sp_nodes = NEW_ARR_F(ir_node*, 0);
2320 irg_walk_graph(birg->irg, collect_stack_nodes_walker, NULL, &walker_env);
2322 /* nothing to be done if we didn't find any node, in fact we mustn't
2323 * continue, as for endless loops incsp might have had no users and is bad
2326 len = ARR_LEN(walker_env.sp_nodes);
2328 DEL_ARR_F(walker_env.sp_nodes);
2332 be_ssa_construction_init(&senv, birg);
2333 be_ssa_construction_add_copies(&senv, walker_env.sp_nodes,
2334 ARR_LEN(walker_env.sp_nodes));
2335 be_ssa_construction_fix_users_array(&senv, walker_env.sp_nodes,
2336 ARR_LEN(walker_env.sp_nodes));
2339 len = ARR_LEN(walker_env.sp_nodes);
2340 for (i = 0; i < len; ++i) {
2341 be_liveness_update(lv, walker_env.sp_nodes[i]);
2343 be_ssa_construction_update_liveness_phis(&senv, lv);
2346 phis = be_ssa_construction_get_new_phis(&senv);
2348 /* set register requirements for stack phis */
2349 len = ARR_LEN(phis);
2350 for (i = 0; i < len; ++i) {
2351 ir_node *phi = phis[i];
2352 be_set_phi_reg_req(phi, &env->sp_req, arch_register_req_type_produces_sp);
2353 arch_set_irn_register(phi, env->arch_env->sp);
2355 be_ssa_construction_destroy(&senv);
2357 DEL_ARR_F(walker_env.sp_nodes);
2361 * Fix all stack accessing operations in the block bl.
2363 * @param env the abi environment
2364 * @param bl the block to process
2365 * @param real_bias the bias value
2367 * @return the bias at the end of this block
2369 static int process_stack_bias(be_abi_irg_t *env, ir_node *bl, int real_bias)
2371 int omit_fp = env->call->flags.bits.try_omit_fp;
2373 int wanted_bias = real_bias;
2375 sched_foreach(bl, irn) {
2379 Check, if the node relates to an entity on the stack frame.
2380 If so, set the true offset (including the bias) for that
2383 ir_entity *ent = arch_get_frame_entity(irn);
2385 int bias = omit_fp ? real_bias : 0;
2386 int offset = get_stack_entity_offset(&env->frame, ent, bias);
2387 arch_set_frame_offset(irn, offset);
2388 DBG((env->dbg, LEVEL_2, "%F has offset %d (including bias %d)\n",
2389 ent, offset, bias));
2393 * If the node modifies the stack pointer by a constant offset,
2394 * record that in the bias.
2396 ofs = arch_get_sp_bias(irn);
2398 if (be_is_IncSP(irn)) {
2399 /* fill in real stack frame size */
2400 if (ofs == BE_STACK_FRAME_SIZE_EXPAND) {
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);
2404 } else if (ofs == BE_STACK_FRAME_SIZE_SHRINK) {
2405 ir_type *frame_type = get_irg_frame_type(env->birg->irg);
2406 ofs = - (int)get_type_size_bytes(frame_type);
2407 be_set_IncSP_offset(irn, ofs);
2409 if (be_get_IncSP_align(irn)) {
2410 /* patch IncSP to produce an aligned stack pointer */
2411 ir_type *between_type = env->frame.between_type;
2412 int between_size = get_type_size_bytes(between_type);
2413 int alignment = 1 << env->arch_env->stack_alignment;
2414 int delta = (real_bias + ofs + between_size) & (alignment - 1);
2417 be_set_IncSP_offset(irn, ofs + alignment - delta);
2418 real_bias += alignment - delta;
2421 /* adjust so real_bias corresponds with wanted_bias */
2422 int delta = wanted_bias - real_bias;
2425 be_set_IncSP_offset(irn, ofs + delta);
2436 assert(real_bias == wanted_bias);
2441 * A helper struct for the bias walker.
2444 be_abi_irg_t *env; /**< The ABI irg environment. */
2445 int start_block_bias; /**< The bias at the end of the start block. */
2447 ir_node *start_block; /**< The start block of the current graph. */
2451 * Block-Walker: fix all stack offsets for all blocks
2452 * except the start block
2454 static void stack_bias_walker(ir_node *bl, void *data)
2456 struct bias_walk *bw = data;
2457 if (bl != bw->start_block) {
2458 process_stack_bias(bw->env, bl, bw->start_block_bias);
2462 void be_abi_fix_stack_bias(be_abi_irg_t *env)
2464 ir_graph *irg = env->birg->irg;
2465 struct bias_walk bw;
2467 stack_frame_compute_initial_offset(&env->frame);
2468 // stack_layout_dump(stdout, frame);
2470 /* Determine the stack bias at the end of the start block. */
2471 bw.start_block_bias = process_stack_bias(env, get_irg_start_block(irg), env->frame.initial_bias);
2472 bw.between_size = get_type_size_bytes(env->frame.between_type);
2474 /* fix the bias is all other blocks */
2476 bw.start_block = get_irg_start_block(irg);
2477 irg_block_walk_graph(irg, stack_bias_walker, NULL, &bw);
2480 ir_node *be_abi_get_callee_save_irn(be_abi_irg_t *abi, const arch_register_t *reg)
2482 assert(arch_register_type_is(reg, callee_save));
2483 assert(pmap_contains(abi->regs, (void *) reg));
2484 return pmap_get(abi->regs, (void *) reg);
2487 ir_node *be_abi_get_ignore_irn(be_abi_irg_t *abi, const arch_register_t *reg)
2489 assert(arch_register_type_is(reg, ignore));
2490 assert(pmap_contains(abi->regs, (void *) reg));
2491 return pmap_get(abi->regs, (void *) reg);
2495 * Returns non-zero if the ABI has omitted the frame pointer in
2496 * the current graph.
2498 int be_abi_omit_fp(const be_abi_irg_t *abi)
2500 return abi->call->flags.bits.try_omit_fp;