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 Lowering of high level constructs.
23 * @author Michael Beck
26 #ifndef FIRM_LOWERING_H
27 #define FIRM_LOWERING_H
29 #include "firm_types.h"
31 * A type telling where to add hidden parameters.
33 typedef enum add_hidden_params {
34 ADD_HIDDEN_ALWAYS_IN_FRONT = 0, /**< always add hidden parameters in front (default). */
35 ADD_HIDDEN_ALWAYS_LAST = 1, /**< always add hidden parameters last, did not work for variadic functions. */
36 ADD_HIDDEN_SMART = 2 /**< add hidden parameters last for non-variadic and first for variadic functions. */
40 * Additional flags for the lowering.
43 LF_NONE = 0, /**< no additional flags */
44 LF_COMPOUND_PARAM = 1, /**< lower calls with compound parameters */
45 LF_COMPOUND_RETURN = 2, /**< lower calls with compound returns */
46 LF_RETURN_HIDDEN = 4, /**< return the hidden address instead of void */
47 LF_SMALL_CMP_IN_REGS = 8 /**< return small compound values in registers */
50 /** Maximum number of registers that can be used to return compound values. */
51 #define MAX_REGISTER_RET_VAL 2
54 * A struct containing all control parameters for
55 * lower_compound_ret_calls().
58 int def_ptr_alignment; /**< Default alignment for data pointer. */
59 unsigned flags; /**< A bitmask of enum lowering_flags. */
60 add_hidden hidden_params; /**< Where to add hidden parameters. */
63 * A function returning a pointer type for a given type.
64 * If this pointer is NULL, a new pointer type is always created.
66 ir_type *(*find_pointer_type)(ir_type *e_type, ir_mode *mode, int alignment);
69 * If the LF_SMALL_CMP_IN_REGS flag is set, this function will be called
70 * to decide, whether a compound value should be returned in registers.
71 * This function must return the number of used registers and fill in the modes
72 * of the registers to use. Up to MAX_REGISTER_RET_VAL registers can be used.
74 int (*ret_compound_in_regs)(ir_type *compound_tp, ir_mode **modes);
78 * Lower calls with compound parameter and return types.
79 * This function does the following transformations:
81 * If LF_COMPOUND_PARAM is set:
83 * - Copy compound parameters to a new location on the callers
84 * stack and transmit the address of this new location
86 * If LF_COMPOUND_RETURN is set:
88 * - Adds a new (hidden) pointer parameter for
89 * any return compound type. The return type is replaced by void
90 * or if LOWERING_FLAGS_RETURN_HIDDEN is set by the address.
92 * - Use of the hidden parameters in the function code.
94 * - Change all calls to functions with compound return
95 * by providing space for the hidden parameter on the callers
98 * - Replace a possible block copy after the function call.
102 * - Changes the types of methods and calls to the lowered ones
104 * - lower all method types of existing entities
106 * In pseudo-code, the following transformation is done:
109 struct x ret = func(a, b);
118 * If the function returns only one possible result, the copy-on-return
119 * optimization is done, ie.
128 * is transformed into
131 void func(struct x *ret, a) {
136 * @param params A structure containing the control parameter for this
139 * During the transformation, pointer types must be created or reused.
140 * The caller can provide params->find_pointer_type for this task to
141 * reduce the number of created pointer types.
142 * If params->find_pointer_type is NULL, new pointer types
143 * are always created automatically.
145 void lower_calls_with_compounds(const lower_params_t *params);
148 * * Lower CopyB nodes of size smaller that max_size into Loads/Stores
150 void lower_CopyB(ir_graph *irg, unsigned max_size, unsigned native_mode_bytes);
153 * Lowers all Switches (Cond nodes with non-boolean mode) depending on spare_size.
154 * They will either remain the same or be converted into if-cascades.
156 * @param irg The ir graph to be lowered.
157 * @param spare_size Allowed spare size for table switches in machine words.
158 * (Default in edgfe: 128)
160 void lower_switch(ir_graph *irg, unsigned spare_size);
163 * A callback type for creating an intrinsic entity for a given opcode.
165 * @param method the method type of the emulation function entity
166 * @param op the emulated ir_op
167 * @param imode the input mode of the emulated opcode
168 * @param omode the output mode of the emulated opcode
169 * @param context the context parameter
171 typedef ir_entity *(create_intrinsic_fkt)(ir_type *method, const ir_op *op,
172 const ir_mode *imode, const ir_mode *omode,
176 * The lowering parameter description.
178 typedef struct _lwrdw_param_t {
179 int enable; /**< if true lowering is enabled */
180 int little_endian; /**< if true should be lowered for little endian, else big endian */
181 ir_mode *high_signed; /**< the double word signed mode to be lowered, typically Ls */
182 ir_mode *high_unsigned; /**< the double word unsigned mode to be lowered, typically Lu */
183 ir_mode *low_signed; /**< the word signed mode to be used, typically Is */
184 ir_mode *low_unsigned; /**< the word unsigned mode to be used, typically Iu */
186 /** callback that creates the intrinsic entity */
187 create_intrinsic_fkt *create_intrinsic;
188 void *ctx; /**< context parameter for the creator function */
192 * Lower all double word operations.
194 void lower_dw_ops(const lwrdw_param_t *param);
197 * Default implementation. Context is unused.
199 ir_entity *def_create_intrinsic_fkt(ir_type *method, const ir_op *op,
200 const ir_mode *imode, const ir_mode *omode,
204 * Replaces SymConsts by a real constant if possible.
205 * Replace Sel nodes by address computation. Also resolves array access.
206 * Handle bit fields by added And/Or calculations.
208 * @param irg the graph to lower
210 * @note: There is NO lowering ob objects oriented types. This is highly compiler
211 * and ABI specific and should be placed directly in the compiler.
213 void lower_highlevel_graph(ir_graph *irg, int lower_bitfields);
216 * Replaces SymConsts by a real constant if possible.
217 * Replace Sel nodes by address computation. Also resolves array access.
218 * Handle bit fields by added And/Or calculations.
221 * @Note: There is NO lowering ob objects oriented types. This is highly compiler
222 * and ABI specific and should be placed directly in the compiler.
224 void lower_highlevel(int lower_bitfields);
227 * does the same as lower_highlevel for all nodes on the const code irg
229 void lower_const_code(void);
231 typedef struct lower_mode_b_config_t {
232 /* mode that is used to transport 0/1 values */
233 ir_mode *lowered_mode;
234 /* preferred mode for the "set" operations (a psi that produces a 0 or 1) */
235 ir_mode *lowered_set_mode;
236 /* wether direct Cond -> Cmps should also be lowered */
237 int lower_direct_cmp;
238 } lower_mode_b_config_t;
241 * Lowers mode_b operations to integer arithmetic. After the lowering the only
242 * operations with mode_b are the Projs of Cmps; the only nodes with mode_b
243 * inputs are Cond and Psi nodes.
245 * Example: Psi(a < 0, 1, 0) => a >> 31
247 * @param irg the firm graph to lower
248 * @param config configuration for mode_b lowerer
250 void ir_lower_mode_b(ir_graph *irg, const lower_mode_b_config_t *config);
253 * An intrinsic mapper function.
255 * @param node the IR-node that will be mapped
256 * @param ctx a context
258 * @return non-zero if the call was mapped
260 typedef int (*i_mapper_func)(ir_node *node, void *ctx);
263 INTRINSIC_CALL = 0, /**< the record represents an intrinsic call */
264 INTRINSIC_INSTR /**< the record represents an intrinsic instruction */
268 * An intrinsic call record.
270 typedef struct _i_call_record {
271 enum ikind kind; /**< must be INTRINSIC_CALL */
272 ir_entity *i_ent; /**< the entity representing an intrinsic call */
273 i_mapper_func i_mapper; /**< the mapper function to call */
274 void *ctx; /**< mapper context */
275 void *link; /**< used in the construction algorithm, must be NULL */
279 * An intrinsic instruction record.
281 typedef struct _i_instr_record {
282 enum ikind kind; /**< must be INTRINSIC_INSTR */
283 ir_op *op; /**< the opcode that must be mapped. */
284 i_mapper_func i_mapper; /**< the mapper function to call */
285 void *ctx; /**< mapper context */
286 void *link; /**< used in the construction algorithm, must be NULL */
290 * An intrinsic record.
292 typedef union _i_record {
293 i_call_record i_call;
294 i_instr_record i_instr;
298 * Go through all graphs and map calls to intrinsic functions and instructions.
300 * Every call or instruction is reported to its mapper function,
301 * which is responsible for rebuilding the graph.
303 * current_ir_graph is always set.
305 * @param list an array of intrinsic map records
306 * @param length the length of the array
307 * @param part_block_used set to true if part_block() must be using during lowering
309 * @return number of found intrinsics.
311 unsigned lower_intrinsics(i_record *list, int length, int part_block_used);
314 * A mapper for the integer/float absolute value: type abs(type v).
315 * Replaces the call by a Abs node.
319 int i_mapper_abs(ir_node *call, void *ctx);
322 * A mapper for the integer byte swap value: type bswap(type v).
323 * Replaces the call by a builtin[ir_bk_bswap] node.
327 int i_mapper_bswap(ir_node *call, void *ctx);
330 * A mapper for the floating point sqrt(v): floattype sqrt(floattype v);
332 * @return 1 if the sqrt call was removed, 0 else.
334 int i_mapper_sqrt(ir_node *call, void *ctx);
337 * A mapper for the floating point cbrt(v): floattype sqrt(floattype v);
339 * @return 1 if the cbrt call was removed, 0 else.
341 int i_mapper_cbrt(ir_node *call, void *ctx);
344 * A mapper for the floating point pow(a, b): floattype pow(floattype a, floattype b);
346 * @return 1 if the pow call was removed, 0 else.
348 int i_mapper_pow(ir_node *call, void *ctx);
351 * A mapper for the floating point exp(a): floattype exp(floattype a);
353 * @return 1 if the exp call was removed, 0 else.
355 int i_mapper_exp(ir_node *call, void *ctx);
357 #define i_mapper_exp2 i_mapper_exp
358 #define i_mapper_exp10 i_mapper_exp
361 * A mapper for the floating point log(a): floattype log(floattype a);
363 * @return 1 if the log call was removed, 0 else.
365 int i_mapper_log(ir_node *call, void *ctx);
367 #define i_mapper_log2 i_mapper_log
368 #define i_mapper_log10 i_mapper_log
371 * A mapper for the floating point sin(a): floattype sin(floattype a);
373 * @return 1 if the sin call was removed, 0 else.
375 int i_mapper_sin(ir_node *call, void *ctx);
378 * A mapper for the floating point sin(a): floattype cos(floattype a);
380 * @return 1 if the cos call was removed, 0 else.
382 int i_mapper_cos(ir_node *call, void *ctx);
385 * A mapper for the floating point tan(a): floattype tan(floattype a);
387 * @return 1 if the tan call was removed, 0 else.
389 int i_mapper_tan(ir_node *call, void *ctx);
392 * A mapper for the floating point asin(a): floattype asin(floattype a);
394 * @return 1 if the asin call was removed, 0 else.
396 int i_mapper_asin(ir_node *call, void *ctx);
399 * A mapper for the floating point acos(a): floattype acos(floattype a);
401 * @return 1 if the tan call was removed, 0 else.
403 int i_mapper_acos(ir_node *call, void *ctx);
406 * A mapper for the floating point atan(a): floattype atan(floattype a);
408 * @return 1 if the atan call was removed, 0 else.
410 int i_mapper_atan(ir_node *call, void *ctx);
413 * A mapper for the floating point sinh(a): floattype sinh(floattype a);
415 * @return 1 if the sinh call was removed, 0 else.
417 int i_mapper_sinh(ir_node *call, void *ctx);
420 * A mapper for the floating point cosh(a): floattype cosh(floattype a);
422 * @return 1 if the cosh call was removed, 0 else.
424 int i_mapper_cosh(ir_node *call, void *ctx);
427 * A mapper for the floating point tanh(a): floattype tanh(floattype a);
429 * @return 1 if the tanh call was removed, 0 else.
431 int i_mapper_tanh(ir_node *call, void *ctx);
434 * A mapper for the strcmp-Function: inttype strcmp(char pointer a, char pointer b);
436 * @return 1 if the strcmp call was removed, 0 else.
438 int i_mapper_strcmp(ir_node *call, void *ctx);
441 * A mapper for the strncmp-Function: inttype strncmp(char pointer a, char pointer b, inttype len);
443 * @return 1 if the strncmp call was removed, 0 else.
445 int i_mapper_strncmp(ir_node *call, void *ctx);
448 * A mapper for the strcpy-Function: char pointer strcpy(char pointer a, char pointer b);
450 * @return 1 if the strcpy call was removed, 0 else.
452 int i_mapper_strcpy(ir_node *call, void *ctx);
455 * A mapper for the strlen-Function: inttype strlen(char pointer a);
457 * @return 1 if the strlen call was removed, 0 else.
459 int i_mapper_strlen(ir_node *call, void *ctx);
462 * A mapper for the memcpy-Function: void pointer memcpy(void pointer d, void pointer s, inttype c);
464 * @return 1 if the memcpy call was removed, 0 else.
466 int i_mapper_memcpy(ir_node *call, void *ctx);
469 * A mapper for the mempcpy-Function: void pointer mempcpy(void pointer d, void pointer s, inttype c);
471 * @return 1 if the mempcpy call was removed, 0 else.
473 int i_mapper_mempcpy(ir_node *call, void *ctx);
476 * A mapper for the memmove-Function: void pointer memmove(void pointer d, void pointer s, inttype c);
478 * @return 1 if the memmove call was removed, 0 else.
480 int i_mapper_memmove(ir_node *call, void *ctx);
483 * A mapper for the memset-Function: void pointer memset(void pointer d, inttype C, inttype len);
485 * @return 1 if the memset call was removed, 0 else.
487 int i_mapper_memset(ir_node *call, void *ctx);
490 * A mapper for the strncmp-Function: inttype memcmp(void pointer a, void pointer b, inttype len);
492 * @return 1 if the strncmp call was removed, 0 else.
494 int i_mapper_memcmp(ir_node *call, void *ctx);
497 * A mapper for the alloca() function: pointer alloca(inttype size)
498 * Replaces the call by a Alloca(stack_alloc) node.
502 int i_mapper_alloca(ir_node *call, void *ctx);
505 * A runtime routine description.
507 typedef struct _runtime_rt {
508 ir_entity *ent; /**< The entity representing the runtime routine. */
509 ir_mode *mode; /**< The operation mode of the mapped instruction. */
510 ir_mode *res_mode; /**< The result mode of the mapped instruction or NULL. */
511 long mem_proj_nr; /**< if >= 0, create a memory ProjM() */
512 long regular_proj_nr; /**< if >= 0, create a regular ProjX() */
513 long exc_proj_nr; /**< if >= 0, create a exception ProjX() */
514 long exc_mem_proj_nr; /**< if >= 0, create a exception memory ProjM() */
515 long res_proj_nr; /**< if >= 0, first result projection number */
519 * A mapper for mapping unsupported instructions to runtime calls.
520 * Maps a op(arg_0, ..., arg_n) into a call to a runtime function
521 * rt(arg_0, ..., arg_n).
523 * The mapping is only done, if the modes of all arguments matches the
524 * modes of rt's argument.
525 * Further, if op has a memory input, the generated Call uses it, else
527 * The pinned state of the Call will be set to the pinned state of op.
529 * Note that i_mapper_RuntimeCall() must be used with a i_instr_record.
531 * @return 1 if an op was mapped, 0 else
535 * - Maps signed Div nodes to calls to rt_Div():
537 runtime_rt rt_Div = {
538 ent("int rt_Div(int, int)"),
547 i_instr_record map_Div = {
550 i_mapper_RuntimeCall,
556 * - Maps ConvD(F) to calls to rt_Float2Div():
558 runtime_rt rt_Float2Double = {
559 ent("double rt_Float2Div(float)"),
560 get_type_mode("double"),
568 i_instr_record map_Float2Double = {
571 i_mapper_RuntimeCall,
577 int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt);
579 #endif /* FIRM_LOWERING_H */