4 #include "firm_config.h"
7 #include <libcore/lc_opts.h>
10 #include "firm_types.h"
14 #include "belistsched.h"
15 #include "beilpsched.h"
19 #include "bemachine.h"
22 struct _be_node_factory_t;
24 typedef enum _arch_register_type_t {
25 arch_register_type_none = 0,
26 arch_register_type_caller_save = 1, /**< The register must be saved by the caller
27 upon a function call. It thus can be overwritten
28 in the called function. */
29 arch_register_type_callee_save = 2, /**< The register must be saved by the caller
30 upon a function call. It thus can be overwritten
31 in the called function. */
32 arch_register_type_ignore = 4, /**< Do not consider this register when allocating. */
33 arch_register_type_joker = 8, /**< The emitter can choose an arbitrary register */
34 arch_register_type_virtual = 16, /**< This is just a virtual register */
35 } arch_register_type_t;
38 * Convenience macro to check for register type.
39 * @param req A pointer to register.
40 * @param kind The kind of type to check for (see arch_register_type_t).
41 * @return 1, If register is of given kind, 0 if not.
43 #define arch_register_type_is(reg, kind) \
44 (((reg)->type & arch_register_type_ ## kind) != 0)
49 struct _arch_register_t {
50 const char *name; /**< The name of the register. */
51 const arch_register_class_t *reg_class; /**< The class the register belongs to. */
52 int index; /**< The index of the register in the class. */
53 arch_register_type_t type; /**< The type of the register. */
54 void *data; /**< Custom data. */
57 static INLINE const arch_register_class_t *
58 _arch_register_get_class(const arch_register_t *reg)
60 return reg->reg_class;
63 static INLINE int _arch_register_get_index(const arch_register_t *reg)
68 static INLINE const char *_arch_register_get_name(const arch_register_t *reg)
73 #define arch_register_get_class(reg) _arch_register_get_class(reg)
74 #define arch_register_get_index(reg) _arch_register_get_index(reg)
75 #define arch_register_get_name(reg) _arch_register_get_name(reg)
78 * A class of registers.
79 * Like general purpose or floating point.
81 struct _arch_register_class_t {
82 const char *name; /**< The name of the register class. */
83 int n_regs; /**< Number of registers in this class. */
84 ir_mode *mode; /**< The mode of the register class. */
85 const arch_register_t *regs; /**< The array of registers. */
88 /** return the number of registers in this register class */
89 #define arch_register_class_n_regs(cls) ((cls)->n_regs)
91 /** return the largest mode of this register class */
92 #define arch_register_class_mode(cls) ((cls)->mode)
94 /** return the name of this register class */
95 #define arch_register_class_name(cls) ((cls)->name)
98 * Put all registers in a class into a bitset.
99 * @param cls The class.
100 * @param bs The bitset. May be NULL.
101 * @return The number of registers in the class.
103 extern int arch_register_class_put(const arch_register_class_t *cls, bitset_t *bs);
105 static INLINE const arch_register_t *
106 _arch_register_for_index(const arch_register_class_t *cls, int idx)
108 assert(0 <= idx && idx < cls->n_regs);
109 return &cls->regs[idx];
112 #define arch_register_for_index(cls, idx) \
113 _arch_register_for_index(cls, idx)
115 typedef enum _arch_operand_type_t {
116 arch_operand_type_invalid,
117 arch_operand_type_memory,
118 arch_operand_type_register,
119 arch_operand_type_immediate,
120 arch_operand_type_symconst,
121 arch_operand_type_last
122 } arch_operand_type_t;
125 * Different types of register allocation requirements.
127 typedef enum _arch_register_req_type_t {
128 arch_register_req_type_none = 0, /**< No register requirement. */
129 arch_register_req_type_normal = 1, /**< All registers in the class are allowed. */
130 arch_register_req_type_limited = 2, /**< Only a real subset of the class is allowed. */
131 arch_register_req_type_should_be_same = 4, /**< The register should be equal another one at the node. */
132 arch_register_req_type_should_be_different = 8, /**< The register must be unequal to some other at the node. */
133 arch_register_req_type_should_be_different_from_all = 16, /**< The register must be different from all in's at the node */
134 } arch_register_req_type_t;
137 * Convenience macro to check for set constraints.
138 * @param req A pointer to register requirements.
139 * @param kind The kind of constraint to check for (see arch_register_req_type_t).
140 * @return 1, If the kind of constraint is present, 0 if not.
142 #define arch_register_req_is(req, kind) \
143 (((req)->type & (arch_register_req_type_ ## kind)) != 0)
146 * Expresses requirements to register allocation for an operand.
148 typedef struct _arch_register_req_t {
149 arch_register_req_type_t type; /**< The type of the constraint. */
150 const arch_register_class_t *cls; /**< The register class this constraint belongs to. */
152 void (*limited)(void *limited_env, bitset_t *bs);
153 /**< In case of the 'limited'
154 constraint, this function
155 must put all allowable
156 registers in the bitset and
157 return the number of registers
160 void *limited_env; /**< This must passed to limited. */
162 ir_node *other_same; /**< The other which shall have the same reg
163 as this one. (for case should_be_same). */
165 ir_node *other_different; /**< The other node from which this one's register
166 must be different (case must_be_different). */
167 } arch_register_req_t;
170 * Format a register requirements information into a string.
171 * @param buf The string where to put it to.
172 * @param len The size of @p buf.
173 * @param req The requirements structure to format.
174 * @return A pointer to buf.
176 extern char *arch_register_req_format(char *buf, size_t len, const arch_register_req_t *req);
180 * Certain node classes which are relevant for the register allocator.
182 typedef enum _arch_irn_class_t {
183 arch_irn_class_normal = 1 << 0,
184 arch_irn_class_spill = 1 << 1,
185 arch_irn_class_reload = 1 << 2,
186 arch_irn_class_copy = 1 << 3,
187 arch_irn_class_perm = 1 << 4,
188 arch_irn_class_branch = 1 << 5,
189 arch_irn_class_call = 1 << 6,
190 arch_irn_class_const = 1 << 7,
191 arch_irn_class_load = 1 << 8,
192 arch_irn_class_store = 1 << 9,
193 arch_irn_class_stackparam = 1 << 10,
197 * An inverse operation returned by the backend
199 typedef struct _arch_inverse_t {
200 int n; /**< count of nodes returned in nodes array */
201 int costs; /**< costs of this remat */
203 /**< nodes for this inverse operation. shall be in
204 * schedule order. last element is the target value
210 * Some flags describing a node in more detail.
212 typedef enum _arch_irn_flags_t {
213 arch_irn_flags_none = 0, /**< Node flags. */
214 arch_irn_flags_dont_spill = 1, /**< This must not be spilled. */
215 arch_irn_flags_rematerializable = 2, /**< This can be replicated instead of spilled/reloaded. */
216 arch_irn_flags_ignore = 4, /**< Ignore node during register allocation. */
217 arch_irn_flags_modify_sp = 8, /**< I modify the stack pointer. */
218 arch_irn_flags_last = arch_irn_flags_modify_sp
222 * Get the string representation of a flag.
223 * This functions does not handle or'ed bitmasks of flags.
224 * @param flag The flag.
225 * @return The flag as a string.
227 extern const char *arch_irn_flag_str(arch_irn_flags_t flag);
229 struct _arch_irn_ops_if_t {
232 * Get the register requirements for a given operand.
233 * @param self The self pointer.
234 * @param irn The node.
235 * @param pos The operand's position
236 * (-1 for the result of the node, 0..n for the input operands).
237 * @return The register requirements for the selected operand.
238 * The pointer returned is never NULL.
240 const arch_register_req_t *(*get_irn_reg_req)(const void *self,
241 arch_register_req_t *req, const ir_node *irn, int pos);
244 * Set the register for an output operand.
245 * @param irn The node.
246 * @param reg The register allocated to that operand.
247 * @note If the operand is not a register operand,
248 * the call is ignored.
250 void (*set_irn_reg)(const void *self, ir_node *irn, const arch_register_t *reg);
253 * Get the register allocated for an output operand.
254 * @param irn The node.
255 * @return The register allocated at that operand. NULL, if
256 * the operand was no register operand or
257 * @c arch_register_invalid, if no register has yet been
258 * allocated for this node.
260 const arch_register_t *(*get_irn_reg)(const void *self, const ir_node *irn);
264 * @param irn The node.
265 * @return A classification.
267 arch_irn_class_t (*classify)(const void *self, const ir_node *irn);
270 * Get the flags of a node.
271 * @param self The irn ops themselves.
272 * @param irn The node.
273 * @return A set of flags.
275 arch_irn_flags_t (*get_flags)(const void *self, const ir_node *irn);
278 * Get the entity on the stack frame this node depends on.
279 * @param self The this pointer.
280 * @param irn The node in question.
281 * @return The entity on the stack frame or NULL, if the node does not have a
282 * stack frame entity.
284 ir_entity *(*get_frame_entity)(const void *self, const ir_node *irn);
287 * Set the entity on the stack frame this node depends on.
288 * @param self The this pointer.
289 * @param irn The node in question.
290 * @param ent The entity to set
292 void (*set_frame_entity)(const void *self, ir_node *irn, ir_entity *ent);
295 * Set the offset of a node carrying an entity on the stack frame.
296 * @param self The this pointer.
297 * @param irn The node.
298 * @param offset The offset of the node's stack frame entity.
300 void (*set_frame_offset)(const void *self, ir_node *irn, int offset);
303 * Returns the delta of the stackpointer for nodes that increment or
304 * decrement the stackpointer with a constant value. (push, pop
305 * nodes on most architectures).
306 * A positive value stands for an expanding stack area, a negative value for
309 * @param self The this pointer
310 * @param irn The node
311 * @return 0 if the stackpointer is not modified with a constant
312 * value, otherwise the increment/decrement value
314 int (*get_sp_bias)(const void *self, const ir_node *irn);
317 * Returns an inverse operation which yields the i-th argument
318 * of the given node as result.
320 * @param self The this pointer.
321 * @param irn The original operation
322 * @param i Index of the argument we want the inverse operation to yield
323 * @param inverse struct to be filled with the resulting inverse op
324 * @param obstack The obstack to use for allocation of the returned nodes array
325 * @return The inverse operation or NULL if operation invertible
327 arch_inverse_t *(*get_inverse)(const void *self, const ir_node *irn, int i, arch_inverse_t *inverse, struct obstack *obstack);
330 * Get the estimated cycle count for @p irn.
332 * @param self The this pointer.
333 * @param irn The node.
335 * @return The estimated cycle count for this operation
337 int (*get_op_estimated_cost)(const void *self, const ir_node *irn);
340 * Asks the backend whether operand @p i of @p irn can be loaded form memory internally
342 * @param self The this pointer.
343 * @param irn The node.
344 * @param i Index of the argument we would like to know whether @p irn can load it form memory internally
346 * @return nonzero if argument can be loaded or zero otherwise
348 int (*possible_memory_operand)(const void *self, const ir_node *irn, unsigned int i);
351 * Ask the backend to assimilate @p reload of operand @p i into @p irn.
353 * @param self The this pointer.
354 * @param irn The node.
355 * @param spill The spill.
356 * @param i The position of the reload.
358 void (*perform_memory_operand)(const void *self, ir_node *irn, ir_node *spill, unsigned int i);
362 * irn_ops base class.
364 struct _arch_irn_ops_t {
365 const arch_irn_ops_if_t *impl;
368 extern const arch_irn_ops_t *arch_get_irn_ops(const arch_env_t *env, const ir_node *irn);
370 extern void arch_set_frame_offset(const arch_env_t *env, ir_node *irn, int bias);
372 extern ir_entity *arch_get_frame_entity(const arch_env_t *env, ir_node *irn);
373 extern void arch_set_frame_entity(const arch_env_t *env, ir_node *irn, ir_entity *ent);
374 extern int arch_get_sp_bias(const arch_env_t *env, ir_node *irn);
376 extern int arch_get_op_estimated_cost(const arch_env_t *env, const ir_node *irn);
377 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);
378 extern int arch_possible_memory_operand(const arch_env_t *env, const ir_node *irn, unsigned int i);
379 extern void arch_perform_memory_operand(const arch_env_t *env, ir_node *irn, ir_node *spill, unsigned int i);
382 * Get the register requirements for a node.
383 * @param env The architecture environment.
384 * @param req A pointer to a requirements structure, where the data can
386 * @param irn The node.
387 * @param pos The position of the operand you're interested in.
388 * @return A pointer to the register requirements which may <b>not</b>
389 * neccessarily be equal to @p req. If NULL is returned, the
390 * operand was no register operand.
392 extern const arch_register_req_t *
393 arch_get_register_req(const arch_env_t *env, arch_register_req_t *req,
394 const ir_node *irn, int pos);
397 * Check if an operand is a register operand.
398 * @param env The environment.
399 * @param irn The node.
400 * @param pos The position of the operand.
401 * @return 1, if the operand is significant for register allocation, 0
404 extern int arch_is_register_operand(const arch_env_t *env,
405 const ir_node *irn, int pos);
408 * Get the number of allocatable registers concerning
409 * a register class for an operand of a node.
410 * @param env The environment.
411 * @param irn The node.
412 * @param pos The postition of the node's operand.
413 * @param bs The bitset all allocatable registers shall be put into.
414 * Note, that you can also pass NULL here. If you don't,
415 * make sure, the bitset is as large as the register class
417 * @return The amount of registers allocatable for that operand.
419 extern int arch_get_allocatable_regs(const arch_env_t *env, const ir_node *irn, int pos, bitset_t *bs);
422 * Put all registers which shall not be ignored by the register
423 * allocator in a bit set.
424 * @param env The arch env.
425 * @param cls The register class to consider.
426 * @param bs The bit set to put the registers to.
428 extern void arch_put_non_ignore_regs(const arch_env_t *env, const arch_register_class_t *cls, bitset_t *bs);
431 * Check, if a register is assignable to an operand of a node.
432 * @param env The architecture environment.
433 * @param irn The node.
434 * @param pos The position of the operand.
435 * @param reg The register.
436 * @return 1, if the register might be allocated to the operand 0 if not.
438 extern int arch_reg_is_allocatable(const arch_env_t *env,
439 const ir_node *irn, int pos, const arch_register_t *reg);
442 * Get the register class of an operand of a node.
443 * @param env The architecture environment.
444 * @param irn The node.
445 * @param pos The position of the operand, -1 for the output.
446 * @return The register class of the operand or NULL, if
447 * operand is a non-register operand.
449 extern const arch_register_class_t *
450 arch_get_irn_reg_class(const arch_env_t *env, const ir_node *irn, int pos);
453 * Get the register allocated at a certain output operand of a node.
454 * @param env The arch environment.
455 * @param irn The node.
456 * @return The register allocated for this operand
458 extern const arch_register_t *
459 arch_get_irn_register(const arch_env_t *env, const ir_node *irn);
462 * Set the register for a certain output operand.
463 * @param env The architecture environment.
464 * @param irn The node.
465 * @param idx The index of the output operand.
466 * @param reg The register.
468 extern void arch_set_irn_register(const arch_env_t *env, ir_node *irn,
469 const arch_register_t *reg);
473 * @param env The architecture environment.
474 * @param irn The node.
475 * @return A classification of the node.
477 extern arch_irn_class_t arch_irn_classify(const arch_env_t *env, const ir_node *irn);
479 #define arch_irn_class_is(env, irn, irn_class) ((arch_irn_classify(env, irn) & arch_irn_class_ ## irn_class) != 0)
482 * Get the flags of a node.
483 * @param env The architecture environment.
484 * @param irn The node.
487 extern arch_irn_flags_t arch_irn_get_flags(const arch_env_t *env, const ir_node *irn);
489 #define arch_irn_is(env, irn, flag) ((arch_irn_get_flags(env, irn) & arch_irn_flags_ ## flag) != 0)
491 #define arch_irn_has_reg_class(env, irn, pos, cls) \
492 ((cls) == arch_get_irn_reg_class(env, irn, pos))
494 #define arch_irn_consider_in_reg_alloc(env, cls, irn) \
495 (arch_irn_has_reg_class(env, irn, -1, cls) && !arch_irn_is(env, irn, ignore))
498 * Somebody who can be asked about IR nodes.
500 struct _arch_irn_handler_t {
503 * Get the operations of an irn.
504 * @param self The handler from which the method is invoked.
505 * @param irn Some node.
506 * @return Operations for that irn.
508 const void *(*get_irn_ops)(const arch_irn_handler_t *handler,
513 * The code generator interface.
515 struct _arch_code_generator_if_t {
517 * Initialize the code generator.
518 * @param birg A backend IRG session.
519 * @return A newly created code generator.
521 void *(*init)(be_irg_t *birg);
524 * Called before abi introduce.
526 void (*before_abi)(void *self);
529 * Called, when the graph is being normalized.
531 void (*prepare_graph)(void *self);
534 * Backend may provide an own spiller.
535 * This spiller needs to spill all register classes.
537 void (*spill)(void *self, be_irg_t *birg);
540 * Called before scheduling.
542 void (*before_sched)(void *self);
545 * Called before register allocation.
547 void (*before_ra)(void *self);
550 * Called after register allocation.
552 void (*after_ra)(void *self);
555 * Called directly before done is called. This should be the last place
556 * where the irg is modified.
558 void (*finish)(void *self);
561 * Called after everything happened. This call should emit the final
562 * assembly code but avoid changing the irg.
563 * The code generator must also be de-allocated here.
565 void (*done)(void *self);
569 * helper macro: call function func from the code generator
570 * if it's implemented.
572 #define _arch_cg_call(cg, func) \
574 if((cg)->impl->func) \
575 (cg)->impl->func(cg); \
578 #define _arch_cg_call_env(cg, env, func) \
580 if((cg)->impl->func) \
581 (cg)->impl->func(cg, env); \
584 #define arch_code_generator_before_abi(cg) _arch_cg_call(cg, before_abi)
585 #define arch_code_generator_prepare_graph(cg) _arch_cg_call(cg, prepare_graph)
586 #define arch_code_generator_before_sched(cg) _arch_cg_call(cg, before_sched)
587 #define arch_code_generator_before_ra(cg) _arch_cg_call(cg, before_ra)
588 #define arch_code_generator_after_ra(cg) _arch_cg_call(cg, after_ra)
589 #define arch_code_generator_finish(cg) _arch_cg_call(cg, finish)
590 #define arch_code_generator_done(cg) _arch_cg_call(cg, done)
591 #define arch_code_generator_spill(cg, birg) _arch_cg_call_env(cg, birg, spill)
592 #define arch_code_generator_has_spiller(cg) ((cg)->impl->spill != NULL)
595 * Code generator base class.
597 struct _arch_code_generator_t {
598 const arch_code_generator_if_t *impl;
605 const arch_isa_if_t *impl;
606 const arch_register_t *sp; /** The stack pointer register. */
607 const arch_register_t *bp; /** The base pointer register. */
608 const int stack_dir; /** -1 for decreasing, 1 for increasing. */
609 const be_main_env_t *main_env; /** the be main environment */
612 #define arch_isa_stack_dir(isa) ((isa)->stack_dir)
613 #define arch_isa_sp(isa) ((isa)->sp)
614 #define arch_isa_bp(isa) ((isa)->bp)
617 * Architecture interface.
619 struct _arch_isa_if_t {
621 * Initialize the isa interface.
622 * @param file_handle the file handle to write the output to
623 * @param main_env the be main environment
624 * @return a new isa instance
626 void *(*init)(FILE *file_handle);
629 * Free the isa instance.
631 void (*done)(void *self);
634 * Get the the number of register classes in the isa.
635 * @return The number of register classes.
637 int (*get_n_reg_class)(const void *self);
640 * Get the i-th register class.
641 * @param i The number of the register class.
642 * @return The register class.
644 const arch_register_class_t *(*get_reg_class)(const void *self, int i);
647 * Get the register class which shall be used to store a value of a given mode.
648 * @param self The this pointer.
649 * @param mode The mode in question.
650 * @return A register class which can hold values of the given mode.
652 const arch_register_class_t *(*get_reg_class_for_mode)(const void *self, const ir_mode *mode);
655 * Get the ABI restrictions for procedure calls.
656 * @param self The this pointer.
657 * @param method_type The type of the method (procedure) in question.
658 * @param p The array of parameter locations to be filled.
660 void (*get_call_abi)(const void *self, ir_type *method_type, be_abi_call_t *abi);
663 * The irn handler for this architecture.
664 * The irn handler is registered by the Firm back end
665 * when the architecture is initialized.
668 const arch_irn_handler_t *(*get_irn_handler)(const void *self);
671 * Get the code generator interface.
672 * @param self The this pointer.
673 * @return Some code generator interface.
675 const arch_code_generator_if_t *(*get_code_generator_if)(void *self);
678 * Get the list scheduler to use. There is already a selector given, the
679 * backend is free to modify and/or ignore it.
681 * @param self The isa object.
682 * @param selector The selector given by options.
683 * @return The list scheduler selector.
685 const list_sched_selector_t *(*get_list_sched_selector)(const void *self, list_sched_selector_t *selector);
688 * Get the ILP scheduler to use.
689 * @param self The isa object.
690 * @return The ILP scheduler selector
692 const ilp_sched_selector_t *(*get_ilp_sched_selector)(const void *self);
695 * Get the necessary alignment for storing a register of given class.
696 * @param self The isa object.
697 * @param cls The register class.
698 * @return The alignment in bytes.
700 int (*get_reg_class_alignment)(const void *self, const arch_register_class_t *cls);
703 * A "static" function, returns the frontend settings
704 * needed for this backend.
706 const backend_params *(*get_params)(void);
709 * Returns an 2-dim array of execution units, @p irn can be executed on.
710 * The first dimension is the type, the second the allowed units of this type.
711 * Each dimension is a NULL terminated list.
712 * @param self The isa object.
713 * @param irn The node.
714 * @return An array of allowed execution units.
716 * { unit1_of_tp1, ..., unitX1_of_tp1, NULL },
718 * { unit1_of_tpY, ..., unitXn_of_tpY, NULL },
722 const be_execution_unit_t ***(*get_allowed_execution_units)(const void *self, const ir_node *irn);
725 * Return the abstract machine for this isa.
726 * @param self The isa object.
728 const be_machine_t *(*get_machine)(const void *self);
731 * Return an ordered list of irgs where code should be generated for.
732 * If NULL is returned, all irg will be taken into account and they will be
733 * generated in an arbitrary order.
734 * @param self The isa object.
735 * @param irgs A flexible array ARR_F of length 0 where the backend cann append the desired irgs.
736 * @return A flexible array ARR_F containing all desired irgs in the desired order.
738 ir_graph **(*get_backend_irg_list)(const void *self, ir_graph ***irgs);
741 #define arch_isa_get_n_reg_class(isa) ((isa)->impl->get_n_reg_class(isa))
742 #define arch_isa_get_reg_class(isa,i) ((isa)->impl->get_reg_class(isa, i))
743 #define arch_isa_get_irn_handler(isa) ((isa)->impl->get_irn_handler(isa))
744 #define arch_isa_get_call_abi(isa,tp,abi) ((isa)->impl->get_call_abi((isa), (tp), (abi)))
745 #define arch_isa_get_reg_class_for_mode(isa,mode) ((isa)->impl->get_reg_class_for_mode((isa), (mode)))
746 #define arch_isa_make_code_generator(isa,irg) ((isa)->impl->make_code_generator((isa), (irg)))
747 #define arch_isa_get_reg_class_alignment(isa, cls) ((isa)->impl->get_reg_class_alignment((isa), (cls)))
748 #define arch_isa_get_allowed_execution_units(isa, irn) ((isa)->impl->get_allowed_execution_units((isa), (irn)))
749 #define arch_isa_get_machine(isa) ((isa)->impl->get_machine((isa)))
750 #define arch_isa_get_backend_irg_list(isa, irgs) ((isa)->impl->get_backend_irg_list((isa), (irgs)))
752 #define ARCH_MAX_HANDLERS 8
755 * Environment for the architecture infrastructure.
756 * Keep this everywhere you're going.
759 const struct _be_node_factory_t *node_factory; /**< The node factory for be nodes. */
760 arch_isa_t *isa; /**< The isa about which everything is. */
762 arch_irn_handler_t const *handlers[ARCH_MAX_HANDLERS]; /**< The handlers are organized as
765 int handlers_tos; /**< The stack pointer of the handler
770 * Get the isa of an arch environment.
771 * @param env The environment.
772 * @return The isa with which the env was initialized with.
774 #define arch_env_get_isa(env) ((env)->isa)
777 * Initialize the architecture environment struct.
778 * @param isa The isa which shall be put into the environment.
779 * @param file_handle The file handle
780 * @return The environment.
782 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);
785 * Add a node handler to the environment.
786 * @param env The environment.
787 * @param handler A node handler.
788 * @return The environment itself.
790 extern arch_env_t *arch_env_push_irn_handler(arch_env_t *env, const arch_irn_handler_t *handler);
793 * Remove a node handler from the handler stack.
794 * @param env The architecture environment.
795 * @return The popped handler.
797 extern const arch_irn_handler_t *arch_env_pop_irn_handler(arch_env_t *env);
800 * Register an instruction set architecture
802 void be_register_isa_if(const char *name, const arch_isa_if_t *isa);
804 #endif /* _FIRM_BEARCH_H */