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 val_param_tp the value parameter type, will be destroyed
1231 * @param param_map an array mapping method arguments to the stack layout type
1233 * @return the stack argument layout type
1235 static ir_type *compute_arg_type(be_abi_irg_t *env, be_abi_call_t *call,
1236 ir_type *method_type, ir_type *val_param_tp,
1237 ir_entity ***param_map)
1239 int dir = env->call->flags.bits.left_to_right ? 1 : -1;
1240 int inc = env->birg->main_env->arch_env->stack_dir * dir;
1241 int n = get_method_n_params(method_type);
1242 int curr = inc > 0 ? 0 : n - 1;
1248 ident *id = get_entity_ident(get_irg_entity(env->birg->irg));
1251 *param_map = map = obstack_alloc(&env->obst, n * sizeof(ir_entity *));
1252 res = new_type_struct(id_mangle_u(id, new_id_from_chars("arg_type", 8)));
1253 for (i = 0; i < n; ++i, curr += inc) {
1254 ir_type *param_type = get_method_param_type(method_type, curr);
1255 be_abi_call_arg_t *arg = get_call_arg(call, 0, curr);
1258 if (arg->on_stack) {
1259 if (val_param_tp != NULL) {
1260 /* the entity was already created, create a copy in the param type */
1261 ir_entity *val_ent = get_method_value_param_ent(method_type, i);
1262 arg->stack_ent = copy_entity_own(val_ent, res);
1263 set_entity_link(val_ent, arg->stack_ent);
1264 set_entity_link(arg->stack_ent, NULL);
1265 /* must be automatic to set a fixed layout */
1266 set_entity_allocation(arg->stack_ent, allocation_automatic);
1268 /* create a new entity */
1269 snprintf(buf, sizeof(buf), "param_%d", i);
1270 arg->stack_ent = new_entity(res, new_id_from_str(buf), param_type);
1272 ofs += arg->space_before;
1273 ofs = round_up2(ofs, arg->alignment);
1274 set_entity_offset(arg->stack_ent, ofs);
1275 ofs += arg->space_after;
1276 ofs += get_type_size_bytes(param_type);
1277 map[i] = arg->stack_ent;
1280 set_type_size_bytes(res, ofs);
1281 set_type_state(res, layout_fixed);
1286 const arch_register_t *reg;
1290 static int cmp_regs(const void *a, const void *b)
1292 const reg_node_map_t *p = a;
1293 const reg_node_map_t *q = b;
1295 if (p->reg->reg_class == q->reg->reg_class)
1296 return p->reg->index - q->reg->index;
1298 return p->reg->reg_class - q->reg->reg_class;
1301 static reg_node_map_t *reg_map_to_arr(struct obstack *obst, pmap *reg_map)
1304 int n = pmap_count(reg_map);
1306 reg_node_map_t *res = obstack_alloc(obst, n * sizeof(res[0]));
1308 foreach_pmap(reg_map, ent) {
1309 res[i].reg = ent->key;
1310 res[i].irn = ent->value;
1314 qsort(res, n, sizeof(res[0]), cmp_regs);
1319 * Creates a barrier.
1321 static ir_node *create_barrier(be_abi_irg_t *env, ir_node *bl, ir_node **mem, pmap *regs, int in_req)
1323 ir_graph *irg = env->birg->irg;
1324 int n_regs = pmap_count(regs);
1330 rm = reg_map_to_arr(&env->obst, regs);
1332 for (n = 0; n < n_regs; ++n)
1333 obstack_ptr_grow(&env->obst, rm[n].irn);
1336 obstack_ptr_grow(&env->obst, *mem);
1340 in = (ir_node **) obstack_finish(&env->obst);
1341 irn = be_new_Barrier(irg, bl, n, in);
1342 obstack_free(&env->obst, in);
1344 for (n = 0; n < n_regs; ++n) {
1345 ir_node *pred = rm[n].irn;
1346 const arch_register_t *reg = rm[n].reg;
1347 arch_register_type_t add_type = 0;
1350 /* stupid workaround for now... as not all nodes report register
1352 if (!is_Phi(pred)) {
1353 const arch_register_req_t *ireq = arch_get_register_req_out(pred);
1354 if (ireq->type & arch_register_req_type_ignore)
1355 add_type |= arch_register_req_type_ignore;
1356 if (ireq->type & arch_register_req_type_produces_sp)
1357 add_type |= arch_register_req_type_produces_sp;
1360 proj = new_r_Proj(irg, bl, irn, get_irn_mode(pred), n);
1361 be_node_set_reg_class_in(irn, n, reg->reg_class);
1363 be_set_constr_single_reg_in(irn, n, reg, 0);
1364 be_set_constr_single_reg_out(irn, n, reg, add_type);
1365 arch_set_irn_register(proj, reg);
1367 pmap_insert(regs, (void *) reg, proj);
1371 *mem = new_r_Proj(irg, bl, irn, mode_M, n);
1374 obstack_free(&env->obst, rm);
1379 * Creates a be_Return for a Return node.
1381 * @param @env the abi environment
1382 * @param irn the Return node or NULL if there was none
1383 * @param bl the block where the be_Retun should be placed
1384 * @param mem the current memory
1385 * @param n_res number of return results
1387 static ir_node *create_be_return(be_abi_irg_t *env, ir_node *irn, ir_node *bl,
1388 ir_node *mem, int n_res)
1390 be_abi_call_t *call = env->call;
1391 const arch_env_t *arch_env = env->birg->main_env->arch_env;
1393 pmap *reg_map = pmap_create();
1394 ir_node *keep = pmap_get(env->keep_map, bl);
1401 const arch_register_t **regs;
1405 get the valid stack node in this block.
1406 If we had a call in that block there is a Keep constructed by process_calls()
1407 which points to the last stack modification in that block. we'll use
1408 it then. Else we use the stack from the start block and let
1409 the ssa construction fix the usage.
1411 stack = be_abi_reg_map_get(env->regs, arch_env->sp);
1413 stack = get_irn_n(keep, 0);
1415 remove_End_keepalive(get_irg_end(env->birg->irg), keep);
1418 /* Insert results for Return into the register map. */
1419 for (i = 0; i < n_res; ++i) {
1420 ir_node *res = get_Return_res(irn, i);
1421 be_abi_call_arg_t *arg = get_call_arg(call, 1, i);
1422 assert(arg->in_reg && "return value must be passed in register");
1423 pmap_insert(reg_map, (void *) arg->reg, res);
1426 /* Add uses of the callee save registers. */
1427 foreach_pmap(env->regs, ent) {
1428 const arch_register_t *reg = ent->key;
1429 if (arch_register_type_is(reg, callee_save) || arch_register_type_is(reg, ignore))
1430 pmap_insert(reg_map, ent->key, ent->value);
1433 be_abi_reg_map_set(reg_map, arch_env->sp, stack);
1435 /* Make the Epilogue node and call the arch's epilogue maker. */
1436 create_barrier(env, bl, &mem, reg_map, 1);
1437 call->cb->epilogue(env->cb, bl, &mem, reg_map);
1440 Maximum size of the in array for Return nodes is
1441 return args + callee save/ignore registers + memory + stack pointer
1443 in_max = pmap_count(reg_map) + n_res + 2;
1445 in = obstack_alloc(&env->obst, in_max * sizeof(in[0]));
1446 regs = obstack_alloc(&env->obst, in_max * sizeof(regs[0]));
1449 in[1] = be_abi_reg_map_get(reg_map, arch_env->sp);
1451 regs[1] = arch_env->sp;
1454 /* clear SP entry, since it has already been grown. */
1455 pmap_insert(reg_map, (void *) arch_env->sp, NULL);
1456 for (i = 0; i < n_res; ++i) {
1457 be_abi_call_arg_t *arg = get_call_arg(call, 1, i);
1459 in[n] = be_abi_reg_map_get(reg_map, arg->reg);
1460 regs[n++] = arg->reg;
1462 /* Clear the map entry to mark the register as processed. */
1463 be_abi_reg_map_set(reg_map, arg->reg, NULL);
1466 /* grow the rest of the stuff. */
1467 foreach_pmap(reg_map, ent) {
1470 regs[n++] = ent->key;
1474 /* The in array for the new back end return is now ready. */
1476 dbgi = get_irn_dbg_info(irn);
1480 /* we have to pop the shadow parameter in in case of struct returns */
1482 ret = be_new_Return(dbgi, env->birg->irg, bl, n_res, pop, n, in);
1484 /* Set the register classes of the return's parameter accordingly. */
1485 for (i = 0; i < n; ++i) {
1486 if (regs[i] == NULL)
1489 be_node_set_reg_class_in(ret, i, regs[i]->reg_class);
1492 /* Free the space of the Epilog's in array and the register <-> proj map. */
1493 obstack_free(&env->obst, in);
1494 pmap_destroy(reg_map);
1499 typedef struct ent_pos_pair ent_pos_pair;
1500 struct ent_pos_pair {
1501 ir_entity *ent; /**< a value param entity */
1502 int pos; /**< its parameter number */
1503 ent_pos_pair *next; /**< for linking */
1506 typedef struct lower_frame_sels_env_t {
1507 ent_pos_pair *value_param_list; /**< the list of all value param entities */
1508 ir_node *frame; /**< the current frame */
1509 const arch_register_class_t *sp_class; /**< register class of the stack pointer */
1510 ir_type *value_tp; /**< the value type if any */
1511 ir_type *frame_tp; /**< the frame type */
1512 } lower_frame_sels_env_t;
1515 * Walker: Replaces Sels of frame type and
1516 * value param type entities by FrameAddress.
1517 * Links all used entities.
1519 static void lower_frame_sels_walker(ir_node *irn, void *data)
1521 lower_frame_sels_env_t *ctx = data;
1524 ir_node *ptr = get_Sel_ptr(irn);
1526 if (ptr == ctx->frame) {
1527 ir_entity *ent = get_Sel_entity(irn);
1528 ir_node *bl = get_nodes_block(irn);
1532 if (get_entity_owner(ent) == ctx->value_tp) {
1533 ir_entity *argument_ent = get_entity_link(ent);
1535 /* replace by its copy from the argument type */
1536 pos = get_struct_member_index(ctx->value_tp, ent);
1538 if (argument_ent == NULL) {
1539 /* we have NO argument entity yet: This is bad, as we will
1540 * need one for backing store.
1543 ir_type *frame_tp = ctx->frame_tp;
1544 unsigned offset = get_type_size_bytes(frame_tp);
1545 ir_type *tp = get_entity_type(ent);
1546 unsigned align = get_type_alignment_bytes(tp);
1548 offset += align - 1;
1549 offset &= ~(align - 1);
1551 argument_ent = copy_entity_own(ent, frame_tp);
1553 /* must be automatic to set a fixed layout */
1554 set_entity_allocation(argument_ent, allocation_automatic);
1555 set_entity_offset(argument_ent, offset);
1556 offset += get_type_size_bytes(tp);
1558 set_type_size_bytes(frame_tp, offset);
1559 set_entity_link(ent, argument_ent);
1564 nw = be_new_FrameAddr(ctx->sp_class, current_ir_graph, bl, ctx->frame, ent);
1567 /* check, if it's a param sel and if have not seen this entity before */
1568 if (get_entity_owner(ent) == ctx->value_tp && get_entity_link(ent) == NULL) {
1574 ARR_APP1(ent_pos_pair, ctx->value_param_list, pair);
1576 set_entity_link(ent, ctx->value_param_list);
1583 * Check if a value parameter is transmitted as a register.
1584 * This might happen if the address of an parameter is taken which is
1585 * transmitted in registers.
1587 * Note that on some architectures this case must be handled specially
1588 * because the place of the backing store is determined by their ABI.
1590 * In the default case we move the entity to the frame type and create
1591 * a backing store into the first block.
1593 static void fix_address_of_parameter_access(be_abi_irg_t *env, ent_pos_pair *value_param_list)
1595 be_abi_call_t *call = env->call;
1596 ir_graph *irg = env->birg->irg;
1597 ent_pos_pair *entry, *new_list;
1599 int i, n = ARR_LEN(value_param_list);
1600 DEBUG_ONLY(firm_dbg_module_t *dbg = env->dbg;)
1603 for (i = 0; i < n; ++i) {
1604 int pos = value_param_list[i].pos;
1605 be_abi_call_arg_t *arg = get_call_arg(call, 0, pos);
1608 DBG((dbg, LEVEL_2, "\targ #%d need backing store\n", pos));
1609 value_param_list[i].next = new_list;
1610 new_list = &value_param_list[i];
1613 if (new_list != NULL) {
1614 /* ok, change the graph */
1615 ir_node *start_bl = get_irg_start_block(irg);
1616 ir_node *first_bl = NULL;
1617 ir_node *frame, *imem, *nmem, *store, *mem, *args, *args_bl;
1618 const ir_edge_t *edge;
1619 optimization_state_t state;
1622 foreach_block_succ(start_bl, edge) {
1623 ir_node *succ = get_edge_src_irn(edge);
1624 if (start_bl != succ) {
1630 /* we had already removed critical edges, so the following
1631 assertion should be always true. */
1632 assert(get_Block_n_cfgpreds(first_bl) == 1);
1634 /* now create backing stores */
1635 frame = get_irg_frame(irg);
1636 imem = get_irg_initial_mem(irg);
1638 save_optimization_state(&state);
1640 nmem = new_r_Proj(irg, first_bl, get_irg_start(irg), mode_M, pn_Start_M);
1641 restore_optimization_state(&state);
1643 /* reroute all edges to the new memory source */
1644 edges_reroute(imem, nmem, irg);
1648 args = get_irg_args(irg);
1649 args_bl = get_nodes_block(args);
1650 for (entry = new_list; entry != NULL; entry = entry->next) {
1652 ir_type *tp = get_entity_type(entry->ent);
1653 ir_mode *mode = get_type_mode(tp);
1656 /* address for the backing store */
1657 addr = be_new_FrameAddr(env->arch_env->sp->reg_class, irg, first_bl, frame, entry->ent);
1660 mem = new_r_Proj(irg, first_bl, store, mode_M, pn_Store_M);
1662 /* the backing store itself */
1663 store = new_r_Store(irg, first_bl, mem, addr,
1664 new_r_Proj(irg, args_bl, args, mode, i), 0);
1666 /* the new memory Proj gets the last Proj from store */
1667 set_Proj_pred(nmem, store);
1668 set_Proj_proj(nmem, pn_Store_M);
1670 /* move all entities to the frame type */
1671 frame_tp = get_irg_frame_type(irg);
1672 offset = get_type_size_bytes(frame_tp);
1674 /* we will add new entities: set the layout to undefined */
1675 assert(get_type_state(frame_tp) == layout_fixed);
1676 set_type_state(frame_tp, layout_undefined);
1677 for (entry = new_list; entry != NULL; entry = entry->next) {
1678 ir_entity *ent = entry->ent;
1680 /* If the entity is still on the argument type, move it to the frame type.
1681 This happens if the value_param type was build due to compound
1683 if (get_entity_owner(ent) != frame_tp) {
1684 ir_type *tp = get_entity_type(ent);
1685 unsigned align = get_type_alignment_bytes(tp);
1687 offset += align - 1;
1688 offset &= ~(align - 1);
1689 set_entity_owner(ent, frame_tp);
1690 add_class_member(frame_tp, ent);
1691 /* must be automatic to set a fixed layout */
1692 set_entity_allocation(ent, allocation_automatic);
1693 set_entity_offset(ent, offset);
1694 offset += get_type_size_bytes(tp);
1697 set_type_size_bytes(frame_tp, offset);
1698 /* fix the layout again */
1699 set_type_state(frame_tp, layout_fixed);
1704 * The start block has no jump, instead it has an initial exec Proj.
1705 * The backend wants to handle all blocks the same way, so we replace
1706 * the out cfg edge with a real jump.
1708 static void fix_start_block(ir_graph *irg)
1710 ir_node *initial_X = get_irg_initial_exec(irg);
1711 ir_node *start_block = get_irg_start_block(irg);
1712 const ir_edge_t *edge;
1714 assert(is_Proj(initial_X));
1716 foreach_out_edge(initial_X, edge) {
1717 ir_node *block = get_edge_src_irn(edge);
1719 if (is_Anchor(block))
1721 if (block != start_block) {
1722 ir_node *jmp = new_r_Jmp(irg, start_block);
1724 set_Block_cfgpred(block, get_edge_src_pos(edge), jmp);
1728 panic("Initial exec has no follow block in %+F", irg);
1732 * Modify the irg itself and the frame type.
1734 static void modify_irg(be_abi_irg_t *env)
1736 be_abi_call_t *call = env->call;
1737 const arch_env_t *arch_env= env->birg->main_env->arch_env;
1738 const arch_register_t *sp = arch_env_sp(arch_env);
1739 ir_graph *irg = env->birg->irg;
1743 ir_node *new_mem_proj;
1745 ir_type *method_type = get_entity_type(get_irg_entity(irg));
1752 const arch_register_t *fp_reg;
1753 ir_node *frame_pointer;
1754 ir_node *reg_params_bl;
1757 const ir_edge_t *edge;
1758 ir_type *arg_type, *bet_type, *tp;
1759 lower_frame_sels_env_t ctx;
1760 ir_entity **param_map;
1762 DEBUG_ONLY(firm_dbg_module_t *dbg = env->dbg;)
1764 DBG((dbg, LEVEL_1, "introducing abi on %+F\n", irg));
1766 /* Must fetch memory here, otherwise the start Barrier gets the wrong
1767 * memory, which leads to loops in the DAG. */
1768 old_mem = get_irg_initial_mem(irg);
1770 irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
1772 /* set the links of all frame entities to NULL, we use it
1773 to detect if an entity is already linked in the value_param_list */
1774 tp = get_method_value_param_type(method_type);
1777 /* clear the links of the clone type, let the
1778 original entities point to its clones */
1779 for (i = get_struct_n_members(tp) - 1; i >= 0; --i) {
1780 ir_entity *mem = get_struct_member(tp, i);
1781 set_entity_link(mem, NULL);
1785 arg_type = compute_arg_type(env, call, method_type, tp, ¶m_map);
1787 /* Convert the Sel nodes in the irg to frame addr nodes: */
1788 ctx.value_param_list = NEW_ARR_F(ent_pos_pair, 0);
1789 ctx.frame = get_irg_frame(irg);
1790 ctx.sp_class = env->arch_env->sp->reg_class;
1791 ctx.frame_tp = get_irg_frame_type(irg);
1793 /* we will possible add new entities to the frame: set the layout to undefined */
1794 assert(get_type_state(ctx.frame_tp) == layout_fixed);
1795 set_type_state(ctx.frame_tp, layout_undefined);
1797 irg_walk_graph(irg, lower_frame_sels_walker, NULL, &ctx);
1799 /* fix the frame type layout again */
1800 set_type_state(ctx.frame_tp, layout_fixed);
1802 env->regs = pmap_create();
1804 n_params = get_method_n_params(method_type);
1805 args = obstack_alloc(&env->obst, n_params * sizeof(args[0]));
1806 memset(args, 0, n_params * sizeof(args[0]));
1808 /* Check if a value parameter is transmitted as a register.
1809 * This might happen if the address of an parameter is taken which is
1810 * transmitted in registers.
1812 * Note that on some architectures this case must be handled specially
1813 * because the place of the backing store is determined by their ABI.
1815 * In the default case we move the entity to the frame type and create
1816 * a backing store into the first block.
1818 fix_address_of_parameter_access(env, ctx.value_param_list);
1819 DEL_ARR_F(ctx.value_param_list);
1820 irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
1822 /* Fill the argument vector */
1823 arg_tuple = get_irg_args(irg);
1824 foreach_out_edge(arg_tuple, edge) {
1825 ir_node *irn = get_edge_src_irn(edge);
1826 if (! is_Anchor(irn)) {
1827 int nr = get_Proj_proj(irn);
1829 DBG((dbg, LEVEL_2, "\treading arg: %d -> %+F\n", nr, irn));
1833 bet_type = call->cb->get_between_type(env->cb);
1834 stack_frame_init(&env->frame, arg_type, bet_type, get_irg_frame_type(irg), arch_env->stack_dir, param_map);
1836 /* Count the register params and add them to the number of Projs for the RegParams node */
1837 for (i = 0; i < n_params; ++i) {
1838 be_abi_call_arg_t *arg = get_call_arg(call, 0, i);
1839 if (arg->in_reg && args[i]) {
1840 assert(arg->reg != sp && "cannot use stack pointer as parameter register");
1841 assert(i == get_Proj_proj(args[i]));
1843 /* For now, associate the register with the old Proj from Start representing that argument. */
1844 pmap_insert(env->regs, (void *) arg->reg, args[i]);
1845 DBG((dbg, LEVEL_2, "\targ #%d -> reg %s\n", i, arg->reg->name));
1849 /* Collect all callee-save registers */
1850 for (i = 0, n = arch_env_get_n_reg_class(arch_env); i < n; ++i) {
1851 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
1852 for (j = 0; j < cls->n_regs; ++j) {
1853 const arch_register_t *reg = &cls->regs[j];
1854 if (arch_register_type_is(reg, callee_save) ||
1855 arch_register_type_is(reg, state)) {
1856 pmap_insert(env->regs, (void *) reg, NULL);
1861 pmap_insert(env->regs, (void *) sp, NULL);
1862 pmap_insert(env->regs, (void *) arch_env->bp, NULL);
1863 reg_params_bl = get_irg_start_block(irg);
1864 env->reg_params = be_new_RegParams(irg, reg_params_bl, pmap_count(env->regs));
1865 add_irn_dep(env->reg_params, get_irg_start(irg));
1868 * make proj nodes for the callee save registers.
1869 * memorize them, since Return nodes get those as inputs.
1871 * Note, that if a register corresponds to an argument, the regs map contains
1872 * the old Proj from start for that argument.
1875 rm = reg_map_to_arr(&env->obst, env->regs);
1876 for (i = 0, n = pmap_count(env->regs); i < n; ++i) {
1877 arch_register_t *reg = (void *) rm[i].reg;
1878 ir_mode *mode = reg->reg_class->mode;
1880 arch_register_req_type_t add_type = 0;
1884 add_type |= arch_register_req_type_produces_sp | arch_register_req_type_ignore;
1887 proj = new_r_Proj(irg, reg_params_bl, env->reg_params, mode, nr);
1888 pmap_insert(env->regs, (void *) reg, proj);
1889 be_set_constr_single_reg_out(env->reg_params, nr, reg, add_type);
1890 arch_set_irn_register(proj, reg);
1892 DBG((dbg, LEVEL_2, "\tregister save proj #%d -> reg %s\n", nr, reg->name));
1894 obstack_free(&env->obst, rm);
1896 /* create a new initial memory proj */
1897 assert(is_Proj(old_mem));
1898 new_mem_proj = new_r_Proj(irg, get_nodes_block(old_mem),
1899 new_r_Unknown(irg, mode_T), mode_M,
1900 get_Proj_proj(old_mem));
1903 /* Generate the Prologue */
1904 fp_reg = call->cb->prologue(env->cb, &mem, env->regs, &env->frame.initial_bias);
1906 /* do the stack allocation BEFORE the barrier, or spill code
1907 might be added before it */
1908 env->init_sp = be_abi_reg_map_get(env->regs, sp);
1909 start_bl = get_irg_start_block(irg);
1910 env->init_sp = be_new_IncSP(sp, irg, start_bl, env->init_sp, BE_STACK_FRAME_SIZE_EXPAND, 0);
1911 be_abi_reg_map_set(env->regs, sp, env->init_sp);
1913 create_barrier(env, start_bl, &mem, env->regs, 0);
1915 env->init_sp = be_abi_reg_map_get(env->regs, sp);
1916 arch_set_irn_register(env->init_sp, sp);
1918 frame_pointer = be_abi_reg_map_get(env->regs, fp_reg);
1919 set_irg_frame(irg, frame_pointer);
1920 pset_insert_ptr(env->ignore_regs, fp_reg);
1922 /* rewire old mem users to new mem */
1923 set_Proj_pred(new_mem_proj, get_Proj_pred(old_mem));
1924 exchange(old_mem, mem);
1926 set_irg_initial_mem(irg, mem);
1928 /* Now, introduce stack param nodes for all parameters passed on the stack */
1929 for (i = 0; i < n_params; ++i) {
1930 ir_node *arg_proj = args[i];
1931 ir_node *repl = NULL;
1933 if (arg_proj != NULL) {
1934 be_abi_call_arg_t *arg;
1935 ir_type *param_type;
1936 int nr = get_Proj_proj(arg_proj);
1939 nr = MIN(nr, n_params);
1940 arg = get_call_arg(call, 0, nr);
1941 param_type = get_method_param_type(method_type, nr);
1944 repl = pmap_get(env->regs, (void *) arg->reg);
1945 } else if (arg->on_stack) {
1946 ir_node *addr = be_new_FrameAddr(sp->reg_class, irg, reg_params_bl, frame_pointer, arg->stack_ent);
1948 /* For atomic parameters which are actually used, we create a Load node. */
1949 if (is_atomic_type(param_type) && get_irn_n_edges(args[i]) > 0) {
1950 ir_mode *mode = get_type_mode(param_type);
1951 ir_mode *load_mode = arg->load_mode;
1953 ir_node *load = new_r_Load(irg, reg_params_bl, new_NoMem(), addr, load_mode, cons_floats);
1954 repl = new_r_Proj(irg, reg_params_bl, load, load_mode, pn_Load_res);
1956 if (mode != load_mode) {
1957 repl = new_r_Conv(irg, reg_params_bl, repl, mode);
1960 /* The stack parameter is not primitive (it is a struct or array),
1961 * we thus will create a node representing the parameter's address
1967 assert(repl != NULL);
1969 /* Beware: the mode of the register parameters is always the mode of the register class
1970 which may be wrong. Add Conv's then. */
1971 mode = get_irn_mode(args[i]);
1972 if (mode != get_irn_mode(repl)) {
1973 repl = new_r_Conv(irg, get_irn_n(repl, -1), repl, mode);
1975 exchange(args[i], repl);
1979 /* the arg proj is not needed anymore now and should be only used by the anchor */
1980 assert(get_irn_n_edges(arg_tuple) == 1);
1981 kill_node(arg_tuple);
1982 set_irg_args(irg, new_r_Bad(irg));
1984 /* All Return nodes hang on the End node, so look for them there. */
1985 end = get_irg_end_block(irg);
1986 for (i = 0, n = get_Block_n_cfgpreds(end); i < n; ++i) {
1987 ir_node *irn = get_Block_cfgpred(end, i);
1989 if (is_Return(irn)) {
1990 ir_node *blk = get_nodes_block(irn);
1991 ir_node *mem = get_Return_mem(irn);
1992 ir_node *ret = create_be_return(env, irn, blk, mem, get_Return_n_ress(irn));
1996 /* if we have endless loops here, n might be <= 0. Do NOT create a be_Return then,
1997 the code is dead and will never be executed. */
1999 obstack_free(&env->obst, args);
2001 /* handle start block here (place a jump in the block) */
2002 fix_start_block(irg);
2005 /** Fix the state inputs of calls that still hang on unknowns */
2007 void fix_call_state_inputs(be_abi_irg_t *env)
2009 const arch_env_t *arch_env = env->arch_env;
2011 arch_register_t **stateregs = NEW_ARR_F(arch_register_t*, 0);
2013 /* Collect caller save registers */
2014 n = arch_env_get_n_reg_class(arch_env);
2015 for (i = 0; i < n; ++i) {
2017 const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, i);
2018 for (j = 0; j < cls->n_regs; ++j) {
2019 const arch_register_t *reg = arch_register_for_index(cls, j);
2020 if (arch_register_type_is(reg, state)) {
2021 ARR_APP1(arch_register_t*, stateregs, (arch_register_t *)reg);
2026 n = ARR_LEN(env->calls);
2027 n_states = ARR_LEN(stateregs);
2028 for (i = 0; i < n; ++i) {
2030 ir_node *call = env->calls[i];
2032 arity = get_irn_arity(call);
2034 /* the state reg inputs are the last n inputs of the calls */
2035 for (s = 0; s < n_states; ++s) {
2036 int inp = arity - n_states + s;
2037 const arch_register_t *reg = stateregs[s];
2038 ir_node *regnode = be_abi_reg_map_get(env->regs, reg);
2040 set_irn_n(call, inp, regnode);
2044 DEL_ARR_F(stateregs);
2048 * Create a trampoline entity for the given method.
2050 static ir_entity *create_trampoline(be_main_env_t *be, ir_entity *method)
2052 ir_type *type = get_entity_type(method);
2053 ident *old_id = get_entity_ld_ident(method);
2054 ident *id = id_mangle3("L", old_id, "$stub");
2055 ir_type *parent = be->pic_trampolines_type;
2056 ir_entity *ent = new_entity(parent, old_id, type);
2057 set_entity_ld_ident(ent, id);
2058 set_entity_visibility(ent, visibility_local);
2059 set_entity_variability(ent, variability_uninitialized);
2065 * Returns the trampoline entity for the given method.
2067 static ir_entity *get_trampoline(be_main_env_t *env, ir_entity *method)
2069 ir_entity *result = pmap_get(env->ent_trampoline_map, method);
2070 if (result == NULL) {
2071 result = create_trampoline(env, method);
2072 pmap_insert(env->ent_trampoline_map, method, result);
2078 static ir_entity *create_pic_symbol(be_main_env_t *be, ir_entity *entity)
2080 ident *old_id = get_entity_ld_ident(entity);
2081 ident *id = id_mangle3("L", old_id, "$non_lazy_ptr");
2082 ir_type *e_type = get_entity_type(entity);
2083 ir_type *type = new_type_pointer(id, e_type, mode_P_data);
2084 ir_type *parent = be->pic_symbols_type;
2085 ir_entity *ent = new_entity(parent, old_id, type);
2086 set_entity_ld_ident(ent, id);
2087 set_entity_visibility(ent, visibility_local);
2088 set_entity_variability(ent, variability_uninitialized);
2093 static ir_entity *get_pic_symbol(be_main_env_t *env, ir_entity *entity)
2095 ir_entity *result = pmap_get(env->ent_pic_symbol_map, entity);
2096 if (result == NULL) {
2097 result = create_pic_symbol(env, entity);
2098 pmap_insert(env->ent_pic_symbol_map, entity, result);
2107 * Returns non-zero if a given entity can be accessed using a relative address.
2109 static int can_address_relative(ir_entity *entity)
2111 return get_entity_variability(entity) == variability_initialized
2112 || get_entity_visibility(entity) == visibility_local;
2115 /** patches SymConsts to work in position independent code */
2116 static void fix_pic_symconsts(ir_node *node, void *data)
2126 be_abi_irg_t *env = data;
2128 be_main_env_t *be = env->birg->main_env;
2130 arity = get_irn_arity(node);
2131 for (i = 0; i < arity; ++i) {
2133 ir_node *pred = get_irn_n(node, i);
2135 ir_entity *pic_symbol;
2136 ir_node *pic_symconst;
2138 if (!is_SymConst(pred))
2141 entity = get_SymConst_entity(pred);
2142 block = get_nodes_block(pred);
2143 irg = get_irn_irg(pred);
2145 /* calls can jump to relative addresses, so we can directly jump to
2146 the (relatively) known call address or the trampoline */
2147 if (i == 1 && is_Call(node)) {
2148 ir_entity *trampoline;
2149 ir_node *trampoline_const;
2151 if (can_address_relative(entity))
2154 dbgi = get_irn_dbg_info(pred);
2155 trampoline = get_trampoline(be, entity);
2156 trampoline_const = new_rd_SymConst_addr_ent(dbgi, irg, mode_P_code,
2158 set_irn_n(node, i, trampoline_const);
2162 /* everything else is accessed relative to EIP */
2163 mode = get_irn_mode(pred);
2164 unknown = new_r_Unknown(irg, mode);
2165 pic_base = arch_code_generator_get_pic_base(env->birg->cg);
2167 /* all ok now for locally constructed stuff */
2168 if (can_address_relative(entity)) {
2169 ir_node *add = new_r_Add(irg, block, pic_base, pred, mode);
2171 /* make sure the walker doesn't visit this add again */
2172 mark_irn_visited(add);
2173 set_irn_n(node, i, add);
2177 /* get entry from pic symbol segment */
2178 dbgi = get_irn_dbg_info(pred);
2179 pic_symbol = get_pic_symbol(be, entity);
2180 pic_symconst = new_rd_SymConst_addr_ent(dbgi, irg, mode_P_code,
2182 add = new_r_Add(irg, block, pic_base, pic_symconst, mode);
2183 mark_irn_visited(add);
2185 /* we need an extra indirection for global data outside our current
2186 module. The loads are always safe and can therefore float
2187 and need no memory input */
2188 load = new_r_Load(irg, block, new_NoMem(), add, mode, cons_floats);
2189 load_res = new_r_Proj(irg, block, load, mode, pn_Load_res);
2191 set_irn_n(node, i, load_res);
2195 be_abi_irg_t *be_abi_introduce(be_irg_t *birg)
2197 be_abi_irg_t *env = XMALLOC(be_abi_irg_t);
2198 ir_node *old_frame = get_irg_frame(birg->irg);
2199 ir_graph *irg = birg->irg;
2203 optimization_state_t state;
2204 unsigned *limited_bitset;
2206 be_omit_fp = birg->main_env->options->omit_fp;
2207 be_omit_leaf_fp = birg->main_env->options->omit_leaf_fp;
2209 obstack_init(&env->obst);
2211 env->arch_env = birg->main_env->arch_env;
2212 env->method_type = get_entity_type(get_irg_entity(irg));
2213 env->call = be_abi_call_new(env->arch_env->sp->reg_class);
2214 arch_env_get_call_abi(env->arch_env, env->method_type, env->call);
2216 env->ignore_regs = pset_new_ptr_default();
2217 env->keep_map = pmap_create();
2218 env->dce_survivor = new_survive_dce();
2221 env->sp_req.type = arch_register_req_type_limited;
2222 env->sp_req.cls = arch_register_get_class(env->arch_env->sp);
2223 limited_bitset = rbitset_obstack_alloc(&env->obst, env->sp_req.cls->n_regs);
2224 rbitset_set(limited_bitset, arch_register_get_index(env->arch_env->sp));
2225 env->sp_req.limited = limited_bitset;
2226 if (env->arch_env->sp->type & arch_register_type_ignore) {
2227 env->sp_req.type |= arch_register_req_type_ignore;
2230 env->sp_cls_req.type = arch_register_req_type_normal;
2231 env->sp_cls_req.cls = arch_register_get_class(env->arch_env->sp);
2233 /* Beware: later we replace this node by the real one, ensure it is not CSE'd
2234 to another Unknown or the stack pointer gets used */
2235 save_optimization_state(&state);
2237 env->init_sp = dummy = new_r_Unknown(irg, env->arch_env->sp->reg_class->mode);
2238 restore_optimization_state(&state);
2240 FIRM_DBG_REGISTER(env->dbg, "firm.be.abi");
2242 env->calls = NEW_ARR_F(ir_node*, 0);
2244 if (birg->main_env->options->pic) {
2245 irg_walk_graph(irg, fix_pic_symconsts, NULL, env);
2248 /* Lower all call nodes in the IRG. */
2252 Beware: init backend abi call object after processing calls,
2253 otherwise some information might be not yet available.
2255 env->cb = env->call->cb->init(env->call, birg->main_env->arch_env, irg);
2257 /* Process the IRG */
2260 /* fix call inputs for state registers */
2261 fix_call_state_inputs(env);
2263 /* We don't need the keep map anymore. */
2264 pmap_destroy(env->keep_map);
2265 env->keep_map = NULL;
2267 /* calls array is not needed anymore */
2268 DEL_ARR_F(env->calls);
2271 /* reroute the stack origin of the calls to the true stack origin. */
2272 exchange(dummy, env->init_sp);
2273 exchange(old_frame, get_irg_frame(irg));
2275 /* Make some important node pointers survive the dead node elimination. */
2276 survive_dce_register_irn(env->dce_survivor, &env->init_sp);
2277 foreach_pmap(env->regs, ent) {
2278 survive_dce_register_irn(env->dce_survivor, (ir_node **) &ent->value);
2281 env->call->cb->done(env->cb);
2286 void be_abi_free(be_abi_irg_t *env)
2288 be_abi_call_free(env->call);
2289 free_survive_dce(env->dce_survivor);
2290 del_pset(env->ignore_regs);
2291 pmap_destroy(env->regs);
2292 obstack_free(&env->obst, NULL);
2296 void be_abi_put_ignore_regs(be_abi_irg_t *abi, const arch_register_class_t *cls, bitset_t *bs)
2298 arch_register_t *reg;
2300 for (reg = pset_first(abi->ignore_regs); reg; reg = pset_next(abi->ignore_regs))
2301 if (reg->reg_class == cls)
2302 bitset_set(bs, reg->index);
2305 void be_abi_set_non_ignore_regs(be_abi_irg_t *abi, const arch_register_class_t *cls, unsigned *raw_bitset)
2308 arch_register_t *reg;
2310 for (i = 0; i < cls->n_regs; ++i) {
2311 if (arch_register_type_is(&cls->regs[i], ignore))
2314 rbitset_set(raw_bitset, i);
2317 for (reg = pset_first(abi->ignore_regs); reg != NULL;
2318 reg = pset_next(abi->ignore_regs)) {
2319 if (reg->reg_class != cls)
2322 rbitset_clear(raw_bitset, reg->index);
2326 /* Returns the stack layout from a abi environment. */
2327 const be_stack_layout_t *be_abi_get_stack_layout(const be_abi_irg_t *abi)
2335 | ___(_)_ __ / ___|| |_ __ _ ___| | __
2336 | |_ | \ \/ / \___ \| __/ _` |/ __| |/ /
2337 | _| | |> < ___) | || (_| | (__| <
2338 |_| |_/_/\_\ |____/ \__\__,_|\___|_|\_\
2342 typedef ir_node **node_array;
2344 typedef struct fix_stack_walker_env_t {
2345 node_array sp_nodes;
2346 } fix_stack_walker_env_t;
2349 * Walker. Collect all stack modifying nodes.
2351 static void collect_stack_nodes_walker(ir_node *node, void *data)
2353 fix_stack_walker_env_t *env = data;
2354 const arch_register_req_t *req;
2356 if (get_irn_mode(node) == mode_T)
2359 req = arch_get_register_req_out(node);
2360 if (! (req->type & arch_register_req_type_produces_sp))
2363 ARR_APP1(ir_node*, env->sp_nodes, node);
2366 void be_abi_fix_stack_nodes(be_abi_irg_t *env)
2368 be_ssa_construction_env_t senv;
2371 be_irg_t *birg = env->birg;
2372 be_lv_t *lv = be_get_birg_liveness(birg);
2373 fix_stack_walker_env_t walker_env;
2375 walker_env.sp_nodes = NEW_ARR_F(ir_node*, 0);
2377 irg_walk_graph(birg->irg, collect_stack_nodes_walker, NULL, &walker_env);
2379 /* nothing to be done if we didn't find any node, in fact we mustn't
2380 * continue, as for endless loops incsp might have had no users and is bad
2383 len = ARR_LEN(walker_env.sp_nodes);
2385 DEL_ARR_F(walker_env.sp_nodes);
2389 be_ssa_construction_init(&senv, birg);
2390 be_ssa_construction_add_copies(&senv, walker_env.sp_nodes,
2391 ARR_LEN(walker_env.sp_nodes));
2392 be_ssa_construction_fix_users_array(&senv, walker_env.sp_nodes,
2393 ARR_LEN(walker_env.sp_nodes));
2396 len = ARR_LEN(walker_env.sp_nodes);
2397 for (i = 0; i < len; ++i) {
2398 be_liveness_update(lv, walker_env.sp_nodes[i]);
2400 be_ssa_construction_update_liveness_phis(&senv, lv);
2403 phis = be_ssa_construction_get_new_phis(&senv);
2405 /* set register requirements for stack phis */
2406 len = ARR_LEN(phis);
2407 for (i = 0; i < len; ++i) {
2408 ir_node *phi = phis[i];
2409 be_set_phi_reg_req(phi, &env->sp_req, arch_register_req_type_produces_sp);
2410 arch_set_irn_register(phi, env->arch_env->sp);
2412 be_ssa_construction_destroy(&senv);
2414 DEL_ARR_F(walker_env.sp_nodes);
2418 * Fix all stack accessing operations in the block bl.
2420 * @param env the abi environment
2421 * @param bl the block to process
2422 * @param real_bias the bias value
2424 * @return the bias at the end of this block
2426 static int process_stack_bias(be_abi_irg_t *env, ir_node *bl, int real_bias)
2428 int omit_fp = env->call->flags.bits.try_omit_fp;
2430 int wanted_bias = real_bias;
2432 sched_foreach(bl, irn) {
2436 Check, if the node relates to an entity on the stack frame.
2437 If so, set the true offset (including the bias) for that
2440 ir_entity *ent = arch_get_frame_entity(irn);
2442 int bias = omit_fp ? real_bias : 0;
2443 int offset = get_stack_entity_offset(&env->frame, ent, bias);
2444 arch_set_frame_offset(irn, offset);
2445 DBG((env->dbg, LEVEL_2, "%F has offset %d (including bias %d)\n",
2446 ent, offset, bias));
2450 * If the node modifies the stack pointer by a constant offset,
2451 * record that in the bias.
2453 ofs = arch_get_sp_bias(irn);
2455 if (be_is_IncSP(irn)) {
2456 /* fill in real stack frame size */
2457 if (ofs == BE_STACK_FRAME_SIZE_EXPAND) {
2458 ir_type *frame_type = get_irg_frame_type(env->birg->irg);
2459 ofs = (int) get_type_size_bytes(frame_type);
2460 be_set_IncSP_offset(irn, ofs);
2461 } else if (ofs == BE_STACK_FRAME_SIZE_SHRINK) {
2462 ir_type *frame_type = get_irg_frame_type(env->birg->irg);
2463 ofs = - (int)get_type_size_bytes(frame_type);
2464 be_set_IncSP_offset(irn, ofs);
2466 if (be_get_IncSP_align(irn)) {
2467 /* patch IncSP to produce an aligned stack pointer */
2468 ir_type *between_type = env->frame.between_type;
2469 int between_size = get_type_size_bytes(between_type);
2470 int alignment = 1 << env->arch_env->stack_alignment;
2471 int delta = (real_bias + ofs + between_size) & (alignment - 1);
2474 be_set_IncSP_offset(irn, ofs + alignment - delta);
2475 real_bias += alignment - delta;
2478 /* adjust so real_bias corresponds with wanted_bias */
2479 int delta = wanted_bias - real_bias;
2482 be_set_IncSP_offset(irn, ofs + delta);
2493 assert(real_bias == wanted_bias);
2498 * A helper struct for the bias walker.
2501 be_abi_irg_t *env; /**< The ABI irg environment. */
2502 int start_block_bias; /**< The bias at the end of the start block. */
2504 ir_node *start_block; /**< The start block of the current graph. */
2508 * Block-Walker: fix all stack offsets for all blocks
2509 * except the start block
2511 static void stack_bias_walker(ir_node *bl, void *data)
2513 struct bias_walk *bw = data;
2514 if (bl != bw->start_block) {
2515 process_stack_bias(bw->env, bl, bw->start_block_bias);
2519 void be_abi_fix_stack_bias(be_abi_irg_t *env)
2521 ir_graph *irg = env->birg->irg;
2522 struct bias_walk bw;
2524 stack_frame_compute_initial_offset(&env->frame);
2525 // stack_layout_dump(stdout, frame);
2527 /* Determine the stack bias at the end of the start block. */
2528 bw.start_block_bias = process_stack_bias(env, get_irg_start_block(irg), env->frame.initial_bias);
2529 bw.between_size = get_type_size_bytes(env->frame.between_type);
2531 /* fix the bias is all other blocks */
2533 bw.start_block = get_irg_start_block(irg);
2534 irg_block_walk_graph(irg, stack_bias_walker, NULL, &bw);
2537 ir_node *be_abi_get_callee_save_irn(be_abi_irg_t *abi, const arch_register_t *reg)
2539 assert(arch_register_type_is(reg, callee_save));
2540 assert(pmap_contains(abi->regs, (void *) reg));
2541 return pmap_get(abi->regs, (void *) reg);
2544 ir_node *be_abi_get_ignore_irn(be_abi_irg_t *abi, const arch_register_t *reg)
2546 assert(arch_register_type_is(reg, ignore));
2547 assert(pmap_contains(abi->regs, (void *) reg));
2548 return pmap_get(abi->regs, (void *) reg);
2552 * Returns non-zero if the ABI has omitted the frame pointer in
2553 * the current graph.
2555 int be_abi_omit_fp(const be_abi_irg_t *abi)
2557 return abi->call->flags.bits.try_omit_fp;