2 * dumper for initialized and uninitialized global data. based on cggg's implementation.
3 * @author Hannes Jakschitsch
7 #include "beasm_dump_globals.h"
12 * returns the highest bit value
14 static unsigned highest_bit(unsigned v)
18 if (v >= (1U << 16U)) {
22 if (v >= (1U << 8U)) {
26 if (v >= (1U << 4U)) {
30 if (v >= (1U << 2U)) {
34 if (v >= (1U << 1U)) {
46 * Determine if an entity is a string constant
47 * @param ent The entity
48 * @return 1 if it is a string constant, 0 otherwise
50 static int ent_is_string_const(entity *ent)
55 ty = get_entity_type(ent);
57 /* if it's an array */
58 if (is_Array_type(ty)) {
59 type *elm_ty = get_array_element_type(ty);
61 /* and the array's alement type is primitive */
62 if (is_Primitive_type(elm_ty)) {
63 ir_mode *mode = get_type_mode(elm_ty);
66 * and the mode of the element type is an int of
67 * the same size as the byte mode
70 && get_mode_size_bits(mode) == get_mode_size_bits(mode_Bs))
74 n = get_compound_ent_n_values(ent);
75 for (i = 0; i < n; ++i) {
76 ir_node *irn = get_compound_ent_value(ent, i);
77 if(get_irn_opcode(irn) != iro_Const)
80 c = (int) get_tarval_long(get_Const_tarval(irn));
82 if((i < n - 1 && !(isgraph(c) || isspace(c)))
83 || (i == n - 1 && c != '\0'))
96 * dump an atomic value
98 static void dump_atomic_value( assembler_t *assembler,
99 asm_segment_t target_segment, ir_node *init)
101 ir_mode *mode = get_irn_mode(init);
102 int bytes = get_mode_size_bytes(mode);
105 switch (get_irn_opcode(init)) {
108 dump_atomic_value(assembler, target_segment, get_Cast_op(init));
112 dump_atomic_value(assembler, target_segment, get_Conv_op(init));
116 tv = get_Const_tarval(init);
118 /* beware of old stuff */
119 assert(! mode_is_reference(mode));
121 /* it's a arithmetic value */
122 assembler->dump_arith_tarval(assembler->private_data, target_segment, tv, bytes);
126 assembler->dump_symconst(assembler->private_data, target_segment, init);
128 switch (get_SymConst_kind(init)) {
129 case symconst_addr_name:
130 assembler->dump_addr_name(assembler->private_data, target_segment, get_id_str(get_SymConst_name(init)));
133 case symconst_addr_ent:
134 assembler->dump_addr_ent(assembler->private_data, target_segment, get_entity_ld_name(get_SymConst_entity(init)));
138 assembler->dump_size(assembler->private_data, target_segment, get_type_size_bytes(get_SymConst_type(init)));
142 assert(0 && "dump_atomic_init(): don't know how to init from this SymConst");
147 dump_atomic_value(assembler, target_segment, get_Add_left(init));
148 assembler->dump_arith_op(assembler->private_data, target_segment, ASM_ARITH_OPERATION_ADD);
149 dump_atomic_value(assembler, target_segment, get_Add_right(init));
153 dump_atomic_value(assembler, target_segment, get_Sub_left(init));
154 assembler->dump_arith_op(assembler, target_segment, ASM_ARITH_OPERATION_SUB);
155 dump_atomic_value(assembler, target_segment, get_Sub_right(init));
159 dump_atomic_value(assembler, target_segment, get_Mul_left(init));
160 assembler->dump_arith_op(assembler, target_segment, ASM_ARITH_OPERATION_MUL);
161 dump_atomic_value(assembler, target_segment, get_Mul_right(init));
165 assert(0 && "dump_atomic_init(): unknown IR-node");
171 * dump an atomic value
173 static void dump_atomic_init(assembler_t* assembler,
174 asm_segment_t target_segment, ir_node *init)
177 ir_mode *mode = get_irn_mode(init);
178 int bytes = get_mode_size_bytes(mode);
180 assembler->dump_atomic_decl(assembler->private_data, target_segment, bytes);
181 dump_atomic_value(assembler, target_segment, init);
182 assembler->dump_newline(assembler->private_data, target_segment);
196 * Dumps the initialization of global variables that are not
199 static void asm_dump_global ( assembler_t *assembler, entity *ent)
201 type *ty = get_entity_type(ent);
202 const char *ld_name = get_entity_ld_name(ent);
203 int align, is_constant, h;
206 asm_segment_t target_segment = ASM_SEGMENT_DATA_INIT;
209 * FIXME: did NOT work for partly constant values
212 /* ignore methods, they are emitted later */
213 if(is_Method_type(ty))
216 /* get the properties of the entity */
217 ent_variability variability = get_entity_variability(ent);
218 ent_visibility visibility = get_entity_visibility(ent);
220 if (variability == variability_constant) {
221 /* a constant entity, put it into the const segment */
222 target_segment = ASM_SEGMENT_CONST;
225 /* check, wether it is initialized, if yes create data */
226 if (variability != variability_uninitialized ) {
228 /* if (visibility == visibility_external_visible) {
229 assembler->dump_external_declaration(assembler->private_data, target_segment, ld_name);
230 // obstack_printf(obst, ".globl\t%s\n", ld_name);
232 align = get_type_alignment_bytes(ty);
234 // obstack_printf(obst, "\t.type\t%s,@object\n", ld_name);
235 // obstack_printf(obst, "\t.size\t%s,%d\n", ld_name, (get_type_size_bits(ty) + 7) >> 3);
236 assembler->dump_declare_object_symbol(assembler->private_data, target_segment, ld_name, (get_type_size_bits(ty) + 7) >> 3);
238 align = get_type_alignment_bytes(ty);
239 assembler->dump_align(assembler->private_data, target_segment, align );
240 assembler->dump_object_symbol_init_decl(assembler->private_data, target_segment, ld_name);
242 align = get_type_alignment_bytes(ty);
243 assembler->dump_declare_initialized_symbol ( assembler->private_data, target_segment, ld_name, (get_type_size_bits(ty)+7)>>3, align, visibility );
248 /* dumps of the different entity type initializiations */
251 if (is_atomic_type(ty)) {
252 if (get_entity_visibility(ent) != visibility_external_allocated)
253 dump_atomic_init(assembler, target_segment, get_atomic_ent_value(ent));
255 else if(ent_is_string_const(ent)) {
256 assembler->dump_string(assembler->private_data, target_segment, ent);
258 else if(is_Array_type(ty)) {
262 /* potential spare values should be already included! */
263 for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
264 entity *step = get_compound_ent_value_member(ent, i);
265 type *stype = get_entity_type(step);
267 if (get_type_mode(stype)) {
269 int align = (get_type_alignment_bits(stype) + 7) >> 3;
270 int n = size % align;
273 assembler->dump_zero_padding(assembler->private_data, target_segment, align-n);
277 dump_atomic_init(assembler, target_segment, get_compound_ent_value(ent, i));
278 size += get_type_size_bytes(stype);
281 filler = get_type_size_bytes(ty) - size;
284 assembler->dump_zero_padding(assembler->private_data, target_segment, filler);
286 else if (is_compound_type(ty)) {
291 /* Compound entities are NOT sorted.
292 * The sorting strategy used doesn't work for `value' compound fields nor
293 * for partially_constant entities.
297 * in the worst case, every entity allocates one byte, so the type
298 * size should be equal or bigger the number of fields
301 type_size = get_type_size_bytes(ty);
302 vals = calloc(type_size, sizeof(*vals));
304 /* collect the values and store them at the offsets */
305 for(i = 0; i < get_compound_ent_n_values(ent); ++i) {
306 int graph_length, aipos, offset, stepsize;
310 entity *member = get_compound_ent_value_member(ent, i);
311 compound_graph_path *path = get_compound_ent_value_path(ent, i);
312 entity *node = get_compound_graph_path_node(path, 0);
313 type *node_type = get_entity_type(node);
315 /* get the access path to the costant value */
316 graph_length = get_compound_graph_path_length(path);
317 ai = calloc(graph_length, sizeof(struct arr_info));
319 /* We wanna know how many arrays are on the path to the entity. We also have to know how
320 * many elements each array holds to calculate the offset for the entity. */
321 for (j = 0; j < graph_length; j++) {
322 entity *step = get_compound_graph_path_node(path, j);
323 type *step_type = get_entity_type(step);
324 int ty_size = (get_type_size_bits(step_type) + 7) >> 3;
328 if (is_Array_type(step_type))
329 for (k = 0; k < get_array_n_dimensions(step_type); k++)
330 n += get_tarval_long(get_Const_tarval(get_array_upper_bound(step_type, k)));
332 ai[j].n_elems = n ? all_n + 1 : 0;
334 ai[j].size = ty_size;
337 aipos = graph_length - 1;
340 for (offset = j = 0; j < graph_length; j++) {
341 entity *step = get_compound_graph_path_node(path, j);
342 type *step_type = get_entity_type(step);
343 int ent_ofs = get_entity_offset_bytes(step);
346 /* add all positive offsets (= offsets in structs) */
347 if (ent_ofs >= 0) offset += ent_ofs;
349 if (j == graph_length - 1) {
350 stepsize = (get_type_size_bits(step_type) + 7) >> 3;
352 /* Search the next free position in vals depending on the information from above (ai). */
353 while (vals[offset]) {
354 if (ai[aipos].visit_cnt < ai[aipos].n_elems) {
356 ai[aipos].visit_cnt++;
359 while (aipos >= 0 && ai[aipos].visit_cnt == ai[aipos].n_elems) {
360 stepsize = ai[aipos--].size;
365 assert(aipos >= 0 && "couldn't store entity");
366 vals[offset] = get_compound_ent_value(ent, i);
373 /* now write them sorted */
374 for(i = 0; i < type_size; ) {
376 dump_atomic_init(assembler, target_segment, vals[i]);
377 i += (get_mode_size_bytes(get_irn_mode(vals[i])));
381 //obstack_printf(obst, "\t.byte\t0\n");
382 assembler->dump_zero_padding(assembler->private_data, target_segment, 1);
389 assert(0 && "unsupported type");
391 assembler->dump_newline(assembler->private_data, target_segment);
394 /* uninitialized, but allocated here */
397 /* if (visibility != visibility_external_allocated) {
399 if (visibility == visibility_local) {
400 assembler->dump_local_declaration(assembler->private_data, ASM_SEGMENT_COMMON , ld_name);
403 /* calculate the alignment */
405 target_segment = ASM_SEGMENT_DATA_UNINIT;
407 align = get_type_alignment_bytes(ty);
408 h = highest_bit(align);
410 if ((1 << h) < align)
416 // declare the symbol.
417 assembler->dump_declare_uninitialized_symbol(assembler->private_data, target_segment , ld_name, (get_type_size_bits(ty)+7)>>3, align, visibility);
425 * dump the global symbols
428 void asm_dump_globals ( assembler_t *assembler ) {
430 type *gt = get_glob_type();
431 int i, n = get_class_n_members(gt);
433 for (i = 0; i < n; i++)
434 asm_dump_global( assembler, get_class_member(gt, i) );