4 #include "firm_config.h"
6 #include "firm_types.h"
10 #include "belistsched.h"
11 #include "beilpsched.h"
15 #include "bemachine.h"
18 struct _be_node_factory_t;
20 typedef enum _arch_register_type_t {
21 arch_register_type_none = 0,
22 arch_register_type_caller_save = 1, /**< The register must be saved by the caller
23 upon a function call. It thus can be overwritten
24 in the called function. */
25 arch_register_type_callee_save = 2, /**< The register must be saved by the caller
26 upon a function call. It thus can be overwritten
27 in the called function. */
28 arch_register_type_ignore = 4, /**< Do not consider this register when allocating. */
29 arch_register_type_joker = 8, /**< The emitter can choose an arbitrary register */
30 arch_register_type_virtual = 16, /**< This is just a virtual register */
31 } arch_register_type_t;
34 * Convenience macro to check for register type.
35 * @param req A pointer to register.
36 * @param kind The kind of type to check for (see arch_register_type_t).
37 * @return 1, If register is of given kind, 0 if not.
39 #define arch_register_type_is(reg, kind) \
40 (((reg)->type & arch_register_type_ ## kind) != 0)
45 struct _arch_register_t {
46 const char *name; /**< The name of the register. */
47 const arch_register_class_t *reg_class; /**< The class the register belongs to. */
48 int index; /**< The index of the register in the class. */
49 arch_register_type_t type; /**< The type of the register. */
50 void *data; /**< Custom data. */
53 static INLINE const arch_register_class_t *
54 _arch_register_get_class(const arch_register_t *reg)
56 return reg->reg_class;
59 static INLINE int _arch_register_get_index(const arch_register_t *reg)
64 static INLINE const char *_arch_register_get_name(const arch_register_t *reg)
69 #define arch_register_get_class(reg) _arch_register_get_class(reg)
70 #define arch_register_get_index(reg) _arch_register_get_index(reg)
71 #define arch_register_get_name(reg) _arch_register_get_name(reg)
74 * A class of registers.
75 * Like general purpose or floating point.
77 struct _arch_register_class_t {
78 const char *name; /**< The name of the register class. */
79 int n_regs; /**< Number of registers in this class. */
80 ir_mode *mode; /**< The mode of the register class. */
81 const arch_register_t *regs; /**< The array of registers. */
84 /** return the number of registers in this register class */
85 #define arch_register_class_n_regs(cls) ((cls)->n_regs)
87 /** return the largest mode of this register class */
88 #define arch_register_class_mode(cls) ((cls)->mode)
90 /** return the name of this register class */
91 #define arch_register_class_name(cls) ((cls)->name)
94 * Put all registers in a class into a bitset.
95 * @param cls The class.
96 * @param bs The bitset. May be NULL.
97 * @return The number of registers in the class.
99 extern int arch_register_class_put(const arch_register_class_t *cls, bitset_t *bs);
101 static INLINE const arch_register_t *
102 _arch_register_for_index(const arch_register_class_t *cls, int idx)
104 assert(0 <= idx && idx < cls->n_regs);
105 return &cls->regs[idx];
108 #define arch_register_for_index(cls, idx) \
109 _arch_register_for_index(cls, idx)
111 typedef enum _arch_operand_type_t {
112 arch_operand_type_invalid,
113 arch_operand_type_memory,
114 arch_operand_type_register,
115 arch_operand_type_immediate,
116 arch_operand_type_symconst,
117 arch_operand_type_last
118 } arch_operand_type_t;
121 * Different types of register allocation requirements.
123 typedef enum _arch_register_req_type_t {
124 arch_register_req_type_none = 0, /**< No register requirement. */
125 arch_register_req_type_normal = 1, /**< All registers in the class are allowed. */
126 arch_register_req_type_limited = 2, /**< Only a real subset of the class is allowed. */
127 arch_register_req_type_should_be_same = 4, /**< The register should be equal another one at the node. */
128 arch_register_req_type_should_be_different = 8, /**< The register must be unequal to some other at the node. */
129 arch_register_req_type_should_be_different_from_all = 16, /**< The register must be different from all in's at the node */
130 } arch_register_req_type_t;
133 * Convenience macro to check for set constraints.
134 * @param req A pointer to register requirements.
135 * @param kind The kind of constraint to check for (see arch_register_req_type_t).
136 * @return 1, If the kind of constraint is present, 0 if not.
138 #define arch_register_req_is(req, kind) \
139 (((req)->type & (arch_register_req_type_ ## kind)) != 0)
142 * Expresses requirements to register allocation for an operand.
144 typedef struct _arch_register_req_t {
145 arch_register_req_type_t type; /**< The type of the constraint. */
146 const arch_register_class_t *cls; /**< The register class this constraint belongs to. */
148 void (*limited)(void *limited_env, bitset_t *bs);
149 /**< In case of the 'limited'
150 constraint, this function
151 must put all allowable
152 registers in the bitset and
153 return the number of registers
156 void *limited_env; /**< This must passed to limited. */
158 ir_node *other_same; /**< The other which shall have the same reg
159 as this one. (for case should_be_same). */
161 ir_node *other_different; /**< The other node from which this one's register
162 must be different (case must_be_different). */
163 } arch_register_req_t;
166 * Format a register requirements information into a string.
167 * @param buf The string where to put it to.
168 * @param len The size of @p buf.
169 * @param req The requirements structure to format.
170 * @return A pointer to buf.
172 extern char *arch_register_req_format(char *buf, size_t len, const arch_register_req_t *req);
176 * Certain node classes which are relevant for the register allocator.
178 typedef enum _arch_irn_class_t {
179 arch_irn_class_normal = 1 << 0,
180 arch_irn_class_spill = 1 << 1,
181 arch_irn_class_reload = 1 << 2,
182 arch_irn_class_copy = 1 << 3,
183 arch_irn_class_perm = 1 << 4,
184 arch_irn_class_branch = 1 << 5,
185 arch_irn_class_call = 1 << 6,
186 arch_irn_class_const = 1 << 7,
187 arch_irn_class_load = 1 << 8,
188 arch_irn_class_store = 1 << 9,
189 arch_irn_class_stackparam = 1 << 10,
193 * An inverse operation returned by the backend
195 typedef struct _arch_inverse_t {
196 int n; /**< count of nodes returned in nodes array */
197 int costs; /**< costs of this remat */
199 /**< nodes for this inverse operation. shall be in
200 * schedule order. last element is the target value
206 * Some flags describing a node in more detail.
208 typedef enum _arch_irn_flags_t {
209 arch_irn_flags_none = 0, /**< Node flags. */
210 arch_irn_flags_dont_spill = 1, /**< This must not be spilled. */
211 arch_irn_flags_rematerializable = 2, /**< This can be replicated instead of spilled/reloaded. */
212 arch_irn_flags_ignore = 4, /**< Ignore node during register allocation. */
213 arch_irn_flags_modify_sp = 8, /**< I modify the stack pointer. */
214 arch_irn_flags_last = arch_irn_flags_modify_sp
218 * Get the string representation of a flag.
219 * This functions does not handle or'ed bitmasks of flags.
220 * @param flag The flag.
221 * @return The flag as a string.
223 extern const char *arch_irn_flag_str(arch_irn_flags_t flag);
225 struct _arch_irn_ops_if_t {
228 * Get the register requirements for a given operand.
229 * @param self The self pointer.
230 * @param irn The node.
231 * @param pos The operand's position
232 * (-1 for the result of the node, 0..n for the input operands).
233 * @return The register requirements for the selected operand.
234 * The pointer returned is never NULL.
236 const arch_register_req_t *(*get_irn_reg_req)(const void *self,
237 arch_register_req_t *req, const ir_node *irn, int pos);
240 * Set the register for an output operand.
241 * @param irn The node.
242 * @param reg The register allocated to that operand.
243 * @note If the operand is not a register operand,
244 * the call is ignored.
246 void (*set_irn_reg)(const void *self, ir_node *irn, const arch_register_t *reg);
249 * Get the register allocated for an output operand.
250 * @param irn The node.
251 * @return The register allocated at that operand. NULL, if
252 * the operand was no register operand or
253 * @c arch_register_invalid, if no register has yet been
254 * allocated for this node.
256 const arch_register_t *(*get_irn_reg)(const void *self, const ir_node *irn);
260 * @param irn The node.
261 * @return A classification.
263 arch_irn_class_t (*classify)(const void *self, const ir_node *irn);
266 * Get the flags of a node.
267 * @param self The irn ops themselves.
268 * @param irn The node.
269 * @return A set of flags.
271 arch_irn_flags_t (*get_flags)(const void *self, const ir_node *irn);
274 * Get the entity on the stack frame this node depends on.
275 * @param self The this pointer.
276 * @param irn The node in question.
277 * @return The entity on the stack frame or NULL, if the node does not have a
278 * stack frame entity.
280 ir_entity *(*get_frame_entity)(const void *self, const ir_node *irn);
283 * Set the entity on the stack frame this node depends on.
284 * @param self The this pointer.
285 * @param irn The node in question.
286 * @param ent The entity to set
288 void (*set_frame_entity)(const void *self, ir_node *irn, ir_entity *ent);
291 * Set the offset of a node carrying an entity on the stack frame.
292 * @param self The this pointer.
293 * @param irn The node.
294 * @param offset The offset of the node's stack frame entity.
296 void (*set_frame_offset)(const void *self, ir_node *irn, int offset);
299 * Returns the delta of the stackpointer for nodes that increment or
300 * decrement the stackpointer with a constant value. (push, pop
301 * nodes on most architectures).
302 * A positive value stands for an expanding stack area, a negative value for
305 * @param self The this pointer
306 * @param irn The node
307 * @return 0 if the stackpointer is not modified with a constant
308 * value, otherwise the increment/decrement value
310 int (*get_sp_bias)(const void *self, const ir_node *irn);
313 * Returns an inverse operation which yields the i-th argument
314 * of the given node as result.
316 * @param self The this pointer.
317 * @param irn The original operation
318 * @param i Index of the argument we want the inverse operation to yield
319 * @param inverse struct to be filled with the resulting inverse op
320 * @param obstack The obstack to use for allocation of the returned nodes array
321 * @return The inverse operation or NULL if operation invertible
323 arch_inverse_t *(*get_inverse)(const void *self, const ir_node *irn, int i, arch_inverse_t *inverse, struct obstack *obstack);
326 * Get the estimated cycle count for @p irn.
328 * @param self The this pointer.
329 * @param irn The node.
331 * @return The estimated cycle count for this operation
333 int (*get_op_estimated_cost)(const void *self, const ir_node *irn);
336 * Asks the backend whether operand @p i of @p irn can be loaded form memory internally
338 * @param self The this pointer.
339 * @param irn The node.
340 * @param i Index of the argument we would like to know whether @p irn can load it form memory internally
342 * @return nonzero if argument can be loaded or zero otherwise
344 int (*possible_memory_operand)(const void *self, const ir_node *irn, unsigned int i);
347 * Ask the backend to assimilate @p reload of operand @p i into @p irn.
349 * @param self The this pointer.
350 * @param irn The node.
351 * @param spill The spill.
352 * @param i The position of the reload.
354 void (*perform_memory_operand)(const void *self, ir_node *irn, ir_node *spill, unsigned int i);
358 * irn_ops base class.
360 struct _arch_irn_ops_t {
361 const arch_irn_ops_if_t *impl;
364 extern const arch_irn_ops_t *arch_get_irn_ops(const arch_env_t *env, const ir_node *irn);
366 extern void arch_set_frame_offset(const arch_env_t *env, ir_node *irn, int bias);
368 extern ir_entity *arch_get_frame_entity(const arch_env_t *env, ir_node *irn);
369 extern void arch_set_frame_entity(const arch_env_t *env, ir_node *irn, ir_entity *ent);
370 extern int arch_get_sp_bias(const arch_env_t *env, ir_node *irn);
372 extern int arch_get_op_estimated_cost(const arch_env_t *env, const ir_node *irn);
373 extern arch_inverse_t *arch_get_inverse(const arch_env_t *env, const ir_node *irn, int i, arch_inverse_t *inverse, struct obstack *obstack);
374 extern int arch_possible_memory_operand(const arch_env_t *env, const ir_node *irn, unsigned int i);
375 extern void arch_perform_memory_operand(const arch_env_t *env, ir_node *irn, ir_node *spill, unsigned int i);
378 * Get the register requirements for a node.
379 * @param env The architecture environment.
380 * @param req A pointer to a requirements structure, where the data can
382 * @param irn The node.
383 * @param pos The position of the operand you're interested in.
384 * @return A pointer to the register requirements which may <b>not</b>
385 * neccessarily be equal to @p req. If NULL is returned, the
386 * operand was no register operand.
388 extern const arch_register_req_t *
389 arch_get_register_req(const arch_env_t *env, arch_register_req_t *req,
390 const ir_node *irn, int pos);
393 * Check if an operand is a register operand.
394 * @param env The environment.
395 * @param irn The node.
396 * @param pos The position of the operand.
397 * @return 1, if the operand is significant for register allocation, 0
400 extern int arch_is_register_operand(const arch_env_t *env,
401 const ir_node *irn, int pos);
404 * Get the number of allocatable registers concerning
405 * a register class for an operand of a node.
406 * @param env The environment.
407 * @param irn The node.
408 * @param pos The postition of the node's operand.
409 * @param bs The bitset all allocatable registers shall be put into.
410 * Note, that you can also pass NULL here. If you don't,
411 * make sure, the bitset is as large as the register class
413 * @return The amount of registers allocatable for that operand.
415 extern int arch_get_allocatable_regs(const arch_env_t *env, const ir_node *irn, int pos, bitset_t *bs);
418 * Put all registers which shall not be ignored by the register
419 * allocator in a bit set.
420 * @param env The arch env.
421 * @param cls The register class to consider.
422 * @param bs The bit set to put the registers to.
424 extern void arch_put_non_ignore_regs(const arch_env_t *env, const arch_register_class_t *cls, bitset_t *bs);
427 * Check, if a register is assignable to an operand of a node.
428 * @param env The architecture environment.
429 * @param irn The node.
430 * @param pos The position of the operand.
431 * @param reg The register.
432 * @return 1, if the register might be allocated to the operand 0 if not.
434 extern int arch_reg_is_allocatable(const arch_env_t *env,
435 const ir_node *irn, int pos, const arch_register_t *reg);
438 * Get the register class of an operand of a node.
439 * @param env The architecture environment.
440 * @param irn The node.
441 * @param pos The position of the operand, -1 for the output.
442 * @return The register class of the operand or NULL, if
443 * operand is a non-register operand.
445 extern const arch_register_class_t *
446 arch_get_irn_reg_class(const arch_env_t *env, const ir_node *irn, int pos);
449 * Get the register allocated at a certain output operand of a node.
450 * @param env The arch environment.
451 * @param irn The node.
452 * @return The register allocated for this operand
454 extern const arch_register_t *
455 arch_get_irn_register(const arch_env_t *env, const ir_node *irn);
458 * Set the register for a certain output operand.
459 * @param env The architecture environment.
460 * @param irn The node.
461 * @param idx The index of the output operand.
462 * @param reg The register.
464 extern void arch_set_irn_register(const arch_env_t *env, ir_node *irn,
465 const arch_register_t *reg);
469 * @param env The architecture environment.
470 * @param irn The node.
471 * @return A classification of the node.
473 extern arch_irn_class_t arch_irn_classify(const arch_env_t *env, const ir_node *irn);
475 #define arch_irn_class_is(env, irn, irn_class) ((arch_irn_classify(env, irn) & arch_irn_class_ ## irn_class) != 0)
478 * Get the flags of a node.
479 * @param env The architecture environment.
480 * @param irn The node.
483 extern arch_irn_flags_t arch_irn_get_flags(const arch_env_t *env, const ir_node *irn);
485 #define arch_irn_is(env, irn, flag) ((arch_irn_get_flags(env, irn) & arch_irn_flags_ ## flag) != 0)
487 #define arch_irn_has_reg_class(env, irn, pos, cls) \
488 ((cls) == arch_get_irn_reg_class(env, irn, pos))
490 #define arch_irn_consider_in_reg_alloc(env, cls, irn) \
491 (arch_irn_has_reg_class(env, irn, -1, cls) && !arch_irn_is(env, irn, ignore))
494 * Somebody who can be asked about IR nodes.
496 struct _arch_irn_handler_t {
499 * Get the operations of an irn.
500 * @param self The handler from which the method is invoked.
501 * @param irn Some node.
502 * @return Operations for that irn.
504 const void *(*get_irn_ops)(const arch_irn_handler_t *handler,
509 * The code generator interface.
511 struct _arch_code_generator_if_t {
513 * Initialize the code generator.
514 * @param birg A backend IRG session.
515 * @return A newly created code generator.
517 void *(*init)(be_irg_t *birg);
520 * Called before abi introduce.
522 void (*before_abi)(void *self);
525 * Called, when the graph is being normalized.
527 void (*prepare_graph)(void *self);
530 * Backend may provide an own spiller.
531 * This spiller needs to spill all register classes.
533 void (*spill)(void *self, be_irg_t *birg);
536 * Called before scheduling.
538 void (*before_sched)(void *self);
541 * Called before register allocation.
543 void (*before_ra)(void *self);
546 * Called after register allocation.
548 void (*after_ra)(void *self);
551 * Called directly before done is called. This should be the last place
552 * where the irg is modified.
554 void (*finish)(void *self);
557 * Called after everything happened. This call should emit the final
558 * assembly code but avoid changing the irg.
559 * The code generator must also be de-allocated here.
561 void (*done)(void *self);
565 * helper macro: call function func from the code generator
566 * if it's implemented.
568 #define _arch_cg_call(cg, func) \
570 if((cg)->impl->func) \
571 (cg)->impl->func(cg); \
574 #define _arch_cg_call_env(cg, env, func) \
576 if((cg)->impl->func) \
577 (cg)->impl->func(cg, env); \
580 #define arch_code_generator_before_abi(cg) _arch_cg_call(cg, before_abi)
581 #define arch_code_generator_prepare_graph(cg) _arch_cg_call(cg, prepare_graph)
582 #define arch_code_generator_before_sched(cg) _arch_cg_call(cg, before_sched)
583 #define arch_code_generator_before_ra(cg) _arch_cg_call(cg, before_ra)
584 #define arch_code_generator_after_ra(cg) _arch_cg_call(cg, after_ra)
585 #define arch_code_generator_finish(cg) _arch_cg_call(cg, finish)
586 #define arch_code_generator_done(cg) _arch_cg_call(cg, done)
587 #define arch_code_generator_spill(cg, birg) _arch_cg_call_env(cg, birg, spill)
588 #define arch_code_generator_has_spiller(cg) ((cg)->impl->spill != NULL)
591 * Code generator base class.
593 struct _arch_code_generator_t {
594 const arch_code_generator_if_t *impl;
601 const arch_isa_if_t *impl;
602 const arch_register_t *sp; /** The stack pointer register. */
603 const arch_register_t *bp; /** The base pointer register. */
604 const int stack_dir; /** -1 for decreasing, 1 for increasing. */
605 const be_main_env_t *main_env; /** the be main environment */
608 #define arch_isa_stack_dir(isa) ((isa)->stack_dir)
609 #define arch_isa_sp(isa) ((isa)->sp)
610 #define arch_isa_bp(isa) ((isa)->bp)
613 * Architecture interface.
615 struct _arch_isa_if_t {
617 * Initialize the isa interface.
618 * @param file_handle the file handle to write the output to
619 * @param main_env the be main environment
620 * @return a new isa instance
622 void *(*init)(FILE *file_handle);
625 * Free the isa instance.
627 void (*done)(void *self);
630 * Get the the number of register classes in the isa.
631 * @return The number of register classes.
633 int (*get_n_reg_class)(const void *self);
636 * Get the i-th register class.
637 * @param i The number of the register class.
638 * @return The register class.
640 const arch_register_class_t *(*get_reg_class)(const void *self, int i);
643 * Get the register class which shall be used to store a value of a given mode.
644 * @param self The this pointer.
645 * @param mode The mode in question.
646 * @return A register class which can hold values of the given mode.
648 const arch_register_class_t *(*get_reg_class_for_mode)(const void *self, const ir_mode *mode);
651 * Get the ABI restrictions for procedure calls.
652 * @param self The this pointer.
653 * @param method_type The type of the method (procedure) in question.
654 * @param p The array of parameter locations to be filled.
656 void (*get_call_abi)(const void *self, ir_type *method_type, be_abi_call_t *abi);
659 * The irn handler for this architecture.
660 * The irn handler is registered by the Firm back end
661 * when the architecture is initialized.
664 const arch_irn_handler_t *(*get_irn_handler)(const void *self);
667 * Get the code generator interface.
668 * @param self The this pointer.
669 * @return Some code generator interface.
671 const arch_code_generator_if_t *(*get_code_generator_if)(void *self);
674 * Get the list scheduler to use. There is already a selector given, the
675 * backend is free to modify and/or ignore it.
677 * @param self The isa object.
678 * @param selector The selector given by options.
679 * @return The list scheduler selector.
681 const list_sched_selector_t *(*get_list_sched_selector)(const void *self, list_sched_selector_t *selector);
684 * Get the ILP scheduler to use.
685 * @param self The isa object.
686 * @return The ILP scheduler selector
688 const ilp_sched_selector_t *(*get_ilp_sched_selector)(const void *self);
691 * Get the necessary alignment for storing a register of given class.
692 * @param self The isa object.
693 * @param cls The register class.
694 * @return The alignment in bytes.
696 int (*get_reg_class_alignment)(const void *self, const arch_register_class_t *cls);
699 * A "static" function, returns the frontend settings
700 * needed for this backend.
702 const backend_params *(*get_params)(void);
705 * Returns an 2-dim array of execution units, @p irn can be executed on.
706 * The first dimension is the type, the second the allowed units of this type.
707 * Each dimension is a NULL terminated list.
708 * @param self The isa object.
709 * @param irn The node.
710 * @return An array of allowed execution units.
712 * { unit1_of_tp1, ..., unitX1_of_tp1, NULL },
714 * { unit1_of_tpY, ..., unitXn_of_tpY, NULL },
718 const be_execution_unit_t ***(*get_allowed_execution_units)(const void *self, const ir_node *irn);
721 * Return the abstract machine for this isa.
722 * @param self The isa object.
724 const be_machine_t *(*get_machine)(const void *self);
727 * Return an ordered list of irgs where code should be generated for.
728 * If NULL is returned, all irg will be taken into account and they will be
729 * generated in an arbitrary order.
730 * @param self The isa object.
731 * @param irgs A flexible array ARR_F of length 0 where the backend cann append the desired irgs.
732 * @return A flexible array ARR_F containing all desired irgs in the desired order.
734 ir_graph **(*get_backend_irg_list)(const void *self, ir_graph ***irgs);
737 #define arch_isa_get_n_reg_class(isa) ((isa)->impl->get_n_reg_class(isa))
738 #define arch_isa_get_reg_class(isa,i) ((isa)->impl->get_reg_class(isa, i))
739 #define arch_isa_get_irn_handler(isa) ((isa)->impl->get_irn_handler(isa))
740 #define arch_isa_get_call_abi(isa,tp,abi) ((isa)->impl->get_call_abi((isa), (tp), (abi)))
741 #define arch_isa_get_reg_class_for_mode(isa,mode) ((isa)->impl->get_reg_class_for_mode((isa), (mode)))
742 #define arch_isa_make_code_generator(isa,irg) ((isa)->impl->make_code_generator((isa), (irg)))
743 #define arch_isa_get_reg_class_alignment(isa, cls) ((isa)->impl->get_reg_class_alignment((isa), (cls)))
744 #define arch_isa_get_allowed_execution_units(isa, irn) ((isa)->impl->get_allowed_execution_units((isa), (irn)))
745 #define arch_isa_get_machine(isa) ((isa)->impl->get_machine((isa)))
746 #define arch_isa_get_backend_irg_list(isa, irgs) ((isa)->impl->get_backend_irg_list((isa), (irgs)))
748 #define ARCH_MAX_HANDLERS 8
751 * Environment for the architecture infrastructure.
752 * Keep this everywhere you're going.
755 const struct _be_node_factory_t *node_factory; /**< The node factory for be nodes. */
756 arch_isa_t *isa; /**< The isa about which everything is. */
758 arch_irn_handler_t const *handlers[ARCH_MAX_HANDLERS]; /**< The handlers are organized as
761 int handlers_tos; /**< The stack pointer of the handler
766 * Get the isa of an arch environment.
767 * @param env The environment.
768 * @return The isa with which the env was initialized with.
770 #define arch_env_get_isa(env) ((env)->isa)
773 * Initialize the architecture environment struct.
774 * @param isa The isa which shall be put into the environment.
775 * @param file_handle The file handle
776 * @return The environment.
778 extern arch_env_t *arch_env_init(arch_env_t *env, const arch_isa_if_t *isa, FILE *file_handle, be_main_env_t *main_env);
781 * Add a node handler to the environment.
782 * @param env The environment.
783 * @param handler A node handler.
784 * @return The environment itself.
786 extern arch_env_t *arch_env_push_irn_handler(arch_env_t *env, const arch_irn_handler_t *handler);
789 * Remove a node handler from the handler stack.
790 * @param env The architecture environment.
791 * @return The popped handler.
793 extern const arch_irn_handler_t *arch_env_pop_irn_handler(arch_env_t *env);
796 * Register an instruction set architecture
798 void be_register_isa_if(const char *name, const arch_isa_if_t *isa);
800 #endif /* _FIRM_BEARCH_H */