2 * Copyright (C) 1995-2010 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 Manage addressing into the stackframe
23 * @author Matthias Braun
27 #include "firm_types.h"
29 #include "bearch_sparc_t.h"
30 #include "sparc_new_nodes.h"
31 #include "sparc_cconv.h"
32 #include "bitfiddle.h"
37 static void set_irn_sp_bias(ir_node *node, int new_bias)
39 if (be_is_IncSP(node)) {
40 be_set_IncSP_offset(node, new_bias);
41 } else if (is_sparc_Save(node)) {
42 sparc_attr_t *attr = get_sparc_attr(node);
43 attr->immediate_value = -new_bias;
44 } else if (is_sparc_Restore(node)) {
45 sparc_attr_t *attr = get_sparc_attr(node);
46 attr->immediate_value = new_bias;
50 static void process_bias(ir_node *block, bool sp_relative, int bias,
53 const ir_edge_t *edge;
56 mark_Block_block_visited(block);
58 /* process schedule */
59 sched_foreach(block, irn) {
62 /* set bias to nodes with entities */
63 ir_entity *entity = arch_get_frame_entity(irn);
65 int offset = get_entity_offset(entity);
67 offset += bias + SPARC_MIN_STACKSIZE;
68 arch_set_frame_offset(irn, offset);
71 irn_bias = arch_get_sp_bias(irn);
74 } else if (irn_bias == SP_BIAS_RESET) {
77 /* adjust values to respect stack alignment */
78 int new_bias_unaligned;
80 irn_bias -= free_bytes;
82 new_bias_unaligned = bias + irn_bias;
84 = round_up2(new_bias_unaligned, SPARC_STACK_ALIGNMENT);
85 free_bytes = new_bias_aligned - new_bias_unaligned;
86 set_irn_sp_bias(irn, new_bias_aligned - bias);
87 bias = new_bias_aligned;
92 if (block == get_irg_end_block(get_irn_irg(block))) {
97 /* continue at the successor blocks */
98 foreach_block_succ(block, edge) {
99 ir_node *succ = get_edge_src_irn(edge);
100 if (Block_block_visited(succ))
102 process_bias(succ, sp_relative, bias, free_bytes);
106 static void adjust_entity_offsets(ir_type *type, long offset)
108 size_t n_members = get_compound_n_members(type);
111 for (i = 0; i < n_members; ++i) {
112 ir_entity *member = get_compound_member(type, i);
113 int member_offset = get_entity_offset(member);
114 set_entity_offset(member, member_offset + offset);
119 * Perform some fixups for variadic functions.
120 * To make the rest of the frontend code easier to understand we add
121 * "dummy" parameters until the number of parameters transmitted in registers.
122 * (because otherwise the backend wouldn't store the value of the register
123 * parameters into memory for the VLA magic)
125 bool sparc_variadic_fixups(ir_graph *irg, calling_convention_t *cconv)
127 ir_entity *entity = get_irg_entity(irg);
128 ir_type *mtp = get_entity_type(entity);
129 if (get_method_variadicity(mtp) != variadicity_variadic)
132 if (cconv->n_param_regs >= SPARC_N_PARAM_REGS)
136 size_t n_params = get_method_n_params(mtp);
137 type_dbg_info *dbgi = get_type_dbg_info(mtp);
138 size_t n_ress = get_method_n_ress(mtp);
140 = n_params + (SPARC_N_PARAM_REGS - cconv->n_param_regs);
141 ir_type *new_mtp = new_d_type_method(new_n_params, n_ress, dbgi);
142 ir_mode *gp_reg_mode = sparc_reg_classes[CLASS_sparc_gp].mode;
143 ir_type *gp_reg_type = get_type_for_mode(gp_reg_mode);
144 ir_type *frame_type = get_irg_frame_type(irg);
147 for (i = 0; i < n_ress; ++i) {
148 ir_type *type = get_method_res_type(mtp, i);
149 set_method_res_type(new_mtp, i, type);
151 for (i = 0; i < n_params; ++i) {
152 ir_type *type = get_method_param_type(mtp, i);
153 set_method_param_type(new_mtp, i, type);
155 for ( ; i < new_n_params; ++i) {
156 set_method_param_type(new_mtp, i, gp_reg_type);
157 new_parameter_entity(frame_type, i, gp_reg_type);
160 set_method_variadicity(new_mtp, get_method_variadicity(mtp));
161 set_method_calling_convention(new_mtp, get_method_calling_convention(mtp));
162 set_method_additional_properties(new_mtp, get_method_additional_properties(mtp));
163 set_higher_type(new_mtp, mtp);
165 set_entity_type(entity, new_mtp);
170 static ir_type *compute_arg_type(ir_graph *irg, calling_convention_t *cconv,
171 ir_type *between_type)
173 ir_entity *va_start_entity = NULL;
174 const ir_entity *entity = get_irg_entity(irg);
175 const ir_type *mtp = get_entity_type(entity);
176 size_t n_params = get_method_n_params(mtp);
177 ir_entity **param_map = ALLOCANZ(ir_entity*, n_params);
179 ir_type *frame_type = get_irg_frame_type(irg);
180 size_t n_frame_members = get_compound_n_members(frame_type);
184 ir_type *res = new_type_struct(id_mangle_u(get_entity_ident(entity), new_id_from_chars("arg_type", 8)));
186 /* search for existing value_param entities */
187 for (f = n_frame_members; f > 0; ) {
188 ir_entity *member = get_compound_member(frame_type, --f);
191 if (!is_parameter_entity(member))
193 num = get_entity_parameter_number(member);
194 if (num == IR_VA_START_PARAMETER_NUMBER) {
195 if (va_start_entity != NULL)
196 panic("multiple va_start entities found (%+F,%+F)",
197 va_start_entity, member);
198 va_start_entity = member;
201 assert(num < n_params);
202 if (param_map[num] != NULL)
203 panic("multiple entities for parameter %u in %+F found", f, irg);
205 param_map[num] = member;
206 /* move to new arg_type */
207 set_entity_owner(member, res);
210 /* calculate offsets/create missing entities */
211 for (i = 0; i < n_params; ++i) {
212 reg_or_stackslot_t *param = &cconv->parameters[i];
213 ir_entity *entity = param_map[i];
215 if (param->reg0 != NULL) {
216 /* use reserved spill space on between type */
217 if (entity != NULL) {
218 long offset = SPARC_PARAMS_SPILL_OFFSET + i * SPARC_REGISTER_SIZE;
219 assert(i < SPARC_N_PARAM_REGS);
220 set_entity_owner(entity, between_type);
221 set_entity_offset(entity, offset);
227 entity = new_parameter_entity(res, i, param->type);
228 param->entity = entity;
229 set_entity_offset(entity, param->offset);
232 if (va_start_entity != NULL) {
233 /* sparc_variadic_fixups() fiddled with our type, find out the
234 * original number of parameters */
235 ir_type *non_lowered = get_higher_type(mtp);
236 size_t orig_n_params = get_method_n_params(non_lowered);
238 assert(get_method_variadicity(mtp) == variadicity_variadic);
239 if (orig_n_params < n_params) {
240 assert(param_map[orig_n_params] != NULL);
241 offset = get_entity_offset(param_map[orig_n_params]);
242 set_entity_owner(va_start_entity, between_type);
243 set_entity_offset(va_start_entity, offset);
245 set_entity_owner(va_start_entity, res);
246 set_entity_offset(va_start_entity, cconv->param_stack_size);
249 set_type_size_bytes(res, cconv->param_stack_size);
254 void sparc_create_stacklayout(ir_graph *irg, calling_convention_t *cconv)
256 be_stack_layout_t *layout = be_get_irg_stack_layout(irg);
257 ir_type *between_type;
258 memset(layout, 0, sizeof(*layout));
260 between_type = new_type_class(new_id_from_str("sparc_between_type"));
261 if (cconv->omit_fp) {
262 set_type_size_bytes(between_type, 0);
264 set_type_size_bytes(between_type, SPARC_MIN_STACKSIZE);
267 layout->frame_type = get_irg_frame_type(irg);
268 layout->between_type = between_type;
269 layout->arg_type = compute_arg_type(irg, cconv, between_type);
270 layout->initial_offset = 0;
271 layout->initial_bias = 0;
272 layout->sp_relative = cconv->omit_fp;
274 assert(N_FRAME_TYPES == 3);
275 layout->order[0] = layout->frame_type;
276 layout->order[1] = layout->between_type;
277 layout->order[2] = layout->arg_type;
280 /* Assign entity offsets, to all stack-related entities.
281 * The offsets are relative to the begin of the stack frame.
283 static void process_frame_types(ir_graph *irg)
285 be_stack_layout_t *layout = be_get_irg_stack_layout(irg);
287 /* initially the stackpointer points to the begin of our stackframe.
288 * Situation at the begin of our function:
290 * high address |-----------------------------|
292 * arg-type | stackarg 1 |
294 * |-----------------------------|
295 * | space for storing regarg0-5 |
296 * between type | pointer to aggregate return |
297 * | 16 words save are |
298 * stack pointer -> |-----------------------------|
299 * | high end of stackframe |
301 * | low end of stackframe |
302 * low address |-----------------------------|
304 ir_type *between_type = layout->between_type;
305 unsigned between_size = get_type_size_bytes(between_type);
307 ir_type *frame_type = get_irg_frame_type(irg);
308 unsigned frame_size = get_type_size_bytes(frame_type);
310 ir_type *arg_type = layout->arg_type;
312 adjust_entity_offsets(frame_type, -(long)frame_size);
313 /* no need to adjust between type, it's already at 0 */
314 adjust_entity_offsets(arg_type, between_size);
317 void sparc_fix_stack_bias(ir_graph *irg)
319 bool sp_relative = be_get_irg_stack_layout(irg)->sp_relative;
321 ir_node *start_block = get_irg_start_block(irg);
323 process_frame_types(irg);
325 ir_reserve_resources(irg, IR_RESOURCE_BLOCK_VISITED);
326 inc_irg_block_visited(irg);
327 process_bias(start_block, sp_relative, 0, 0);
328 ir_free_resources(irg, IR_RESOURCE_BLOCK_VISITED);