2 * Linearize - walk the statement tree (but _not_ the expressions)
3 * to generate a linear version of it and the basic blocks.
5 * NOTE! We're not interested in the actual sub-expressions yet,
6 * even though they can generate conditional branches and
7 * subroutine calls. That's all "local" behaviour.
9 * Copyright (C) 2004 Linus Torvalds
10 * Copyright (C) 2004 Christopher Li
20 #include "expression.h"
21 #include "linearize.h"
25 pseudo_t
linearize_statement(struct entrypoint
*ep
, struct statement
*stmt
);
26 pseudo_t
linearize_expression(struct entrypoint
*ep
, struct expression
*expr
);
28 static pseudo_t
add_binary_op(struct entrypoint
*ep
, struct symbol
*ctype
, int op
, pseudo_t left
, pseudo_t right
);
29 static pseudo_t
add_setval(struct entrypoint
*ep
, struct symbol
*ctype
, struct expression
*val
);
30 static pseudo_t
linearize_one_symbol(struct entrypoint
*ep
, struct symbol
*sym
);
33 static pseudo_t
add_load(struct entrypoint
*ep
, struct access_data
*);
34 static pseudo_t
linearize_initializer(struct entrypoint
*ep
, struct expression
*initializer
, struct access_data
*);
35 static pseudo_t
cast_pseudo(struct entrypoint
*ep
, pseudo_t src
, struct symbol
*from
, struct symbol
*to
);
37 struct pseudo void_pseudo
= {};
39 static struct position current_pos
;
41 ALLOCATOR(pseudo_user
, "pseudo_user");
43 static struct instruction
*alloc_instruction(int opcode
, int size
)
45 struct instruction
* insn
= __alloc_instruction(0);
46 insn
->opcode
= opcode
;
48 insn
->pos
= current_pos
;
52 static inline int type_size(struct symbol
*type
)
54 return type
? type
->bit_size
> 0 ? type
->bit_size
: 0 : 0;
57 static struct instruction
*alloc_typed_instruction(int opcode
, struct symbol
*type
)
59 struct instruction
*insn
= alloc_instruction(opcode
, type_size(type
));
64 static struct entrypoint
*alloc_entrypoint(void)
66 return __alloc_entrypoint(0);
69 static struct basic_block
*alloc_basic_block(struct entrypoint
*ep
, struct position pos
)
72 struct basic_block
*bb
= __alloc_basic_block(0);
80 static struct multijmp
*alloc_multijmp(struct basic_block
*target
, int begin
, int end
)
82 struct multijmp
*multijmp
= __alloc_multijmp(0);
83 multijmp
->target
= target
;
84 multijmp
->begin
= begin
;
89 static inline int regno(pseudo_t n
)
92 if (n
&& n
->type
== PSEUDO_REG
)
97 const char *show_pseudo(pseudo_t pseudo
)
100 static char buffer
[4][64];
108 buf
= buffer
[3 & ++n
];
109 switch(pseudo
->type
) {
111 struct symbol
*sym
= pseudo
->sym
;
112 struct expression
*expr
;
114 if (sym
->bb_target
) {
115 snprintf(buf
, 64, ".L%u", sym
->bb_target
->nr
);
119 snprintf(buf
, 64, "%s", show_ident(sym
->ident
));
122 expr
= sym
->initializer
;
123 snprintf(buf
, 64, "<anon symbol:%p>", sym
);
125 switch (expr
->type
) {
127 snprintf(buf
, 64, "<symbol value: %lld>", expr
->value
);
130 return show_string(expr
->string
);
138 i
= snprintf(buf
, 64, "%%r%d", pseudo
->nr
);
140 sprintf(buf
+i
, "(%s)", show_ident(pseudo
->ident
));
143 long long value
= pseudo
->value
;
144 if (value
> 1000 || value
< -1000)
145 snprintf(buf
, 64, "$%#llx", value
);
147 snprintf(buf
, 64, "$%lld", value
);
151 snprintf(buf
, 64, "%%arg%d", pseudo
->nr
);
154 i
= snprintf(buf
, 64, "%%phi%d", pseudo
->nr
);
156 sprintf(buf
+i
, "(%s)", show_ident(pseudo
->ident
));
159 snprintf(buf
, 64, "<bad pseudo type %d>", pseudo
->type
);
164 static const char *opcodes
[] = {
165 [OP_BADOP
] = "bad_op",
168 [OP_ENTRY
] = "<entry-point>",
174 [OP_SWITCH
] = "switch",
175 [OP_INVOKE
] = "invoke",
176 [OP_COMPUTEDGOTO
] = "jmp *",
177 [OP_UNWIND
] = "unwind",
196 [OP_AND_BOOL
] = "and-bool",
197 [OP_OR_BOOL
] = "or-bool",
199 /* Binary comparison */
200 [OP_SET_EQ
] = "seteq",
201 [OP_SET_NE
] = "setne",
202 [OP_SET_LE
] = "setle",
203 [OP_SET_GE
] = "setge",
204 [OP_SET_LT
] = "setlt",
205 [OP_SET_GT
] = "setgt",
208 [OP_SET_BE
] = "setbe",
209 [OP_SET_AE
] = "setae",
215 /* Special three-input */
219 [OP_MALLOC
] = "malloc",
221 [OP_ALLOCA
] = "alloca",
223 [OP_STORE
] = "store",
225 [OP_SYMADDR
] = "symaddr",
226 [OP_GET_ELEMENT_PTR
] = "getelem",
230 [OP_PHISOURCE
] = "phisrc",
232 [OP_SCAST
] = "scast",
233 [OP_FPCAST
] = "fpcast",
234 [OP_PTRCAST
] = "ptrcast",
235 [OP_INLINED_CALL
] = "# call",
237 [OP_VANEXT
] = "va_next",
238 [OP_VAARG
] = "va_arg",
239 [OP_SLICE
] = "slice",
243 [OP_DEATHNOTE
] = "dead",
246 /* Sparse tagging (line numbers, context, whatever) */
247 [OP_CONTEXT
] = "context",
248 [OP_RANGE
] = "range-check",
253 static char *show_asm_constraints(char *buf
, const char *sep
, struct asm_constraint_list
*list
)
255 struct asm_constraint
*entry
;
257 FOR_EACH_PTR(list
, entry
) {
258 buf
+= sprintf(buf
, "%s\"%s\"", sep
, entry
->constraint
);
260 buf
+= sprintf(buf
, " (%s)", show_pseudo(entry
->pseudo
));
262 buf
+= sprintf(buf
, " [%s]", show_ident(entry
->ident
));
264 } END_FOR_EACH_PTR(entry
);
268 static char *show_asm(char *buf
, struct instruction
*insn
)
270 struct asm_rules
*rules
= insn
->asm_rules
;
272 buf
+= sprintf(buf
, "\"%s\"", insn
->string
);
273 buf
= show_asm_constraints(buf
, "\n\t\tout: ", rules
->outputs
);
274 buf
= show_asm_constraints(buf
, "\n\t\tin: ", rules
->inputs
);
275 buf
= show_asm_constraints(buf
, "\n\t\tclobber: ", rules
->clobbers
);
279 const char *show_instruction(struct instruction
*insn
)
281 int opcode
= insn
->opcode
;
282 static char buffer
[4096];
287 buf
+= sprintf(buf
, "# ");
289 if (opcode
< ARRAY_SIZE(opcodes
)) {
290 const char *op
= opcodes
[opcode
];
292 buf
+= sprintf(buf
, "opcode:%d", opcode
);
294 buf
+= sprintf(buf
, "%s", op
);
296 buf
+= sprintf(buf
, ".%d", insn
->size
);
297 memset(buf
, ' ', 20);
301 if (buf
< buffer
+ 12)
305 if (insn
->src
&& insn
->src
!= VOID
)
306 buf
+= sprintf(buf
, "%s", show_pseudo(insn
->src
));
310 buf
+= sprintf(buf
, "%s, .L%u, .L%u", show_pseudo(insn
->cond
), insn
->bb_true
->nr
, insn
->bb_false
->nr
);
314 buf
+= sprintf(buf
, ".L%u", insn
->bb_true
->nr
);
318 struct symbol
*sym
= insn
->symbol
->sym
;
319 buf
+= sprintf(buf
, "%s <- ", show_pseudo(insn
->target
));
321 if (sym
->bb_target
) {
322 buf
+= sprintf(buf
, ".L%u", sym
->bb_target
->nr
);
326 buf
+= sprintf(buf
, "%s", show_ident(sym
->ident
));
329 buf
+= sprintf(buf
, "<anon symbol:%p>", sym
);
334 struct expression
*expr
= insn
->val
;
335 buf
+= sprintf(buf
, "%s <- ", show_pseudo(insn
->target
));
338 buf
+= sprintf(buf
, "%s", "<none>");
342 switch (expr
->type
) {
344 buf
+= sprintf(buf
, "%lld", expr
->value
);
347 buf
+= sprintf(buf
, "%Lf", expr
->fvalue
);
350 buf
+= sprintf(buf
, "%.40s", show_string(expr
->string
));
353 buf
+= sprintf(buf
, "%s", show_ident(expr
->symbol
->ident
));
356 buf
+= sprintf(buf
, ".L%u", expr
->symbol
->bb_target
->nr
);
359 buf
+= sprintf(buf
, "SETVAL EXPR TYPE %d", expr
->type
);
364 struct multijmp
*jmp
;
365 buf
+= sprintf(buf
, "%s", show_pseudo(insn
->cond
));
366 FOR_EACH_PTR(insn
->multijmp_list
, jmp
) {
367 if (jmp
->begin
== jmp
->end
)
368 buf
+= sprintf(buf
, ", %d -> .L%u", jmp
->begin
, jmp
->target
->nr
);
369 else if (jmp
->begin
< jmp
->end
)
370 buf
+= sprintf(buf
, ", %d ... %d -> .L%u", jmp
->begin
, jmp
->end
, jmp
->target
->nr
);
372 buf
+= sprintf(buf
, ", default -> .L%u", jmp
->target
->nr
);
373 } END_FOR_EACH_PTR(jmp
);
376 case OP_COMPUTEDGOTO
: {
377 struct multijmp
*jmp
;
378 buf
+= sprintf(buf
, "%s", show_pseudo(insn
->target
));
379 FOR_EACH_PTR(insn
->multijmp_list
, jmp
) {
380 buf
+= sprintf(buf
, ", .L%u", jmp
->target
->nr
);
381 } END_FOR_EACH_PTR(jmp
);
386 struct instruction
*phi
;
387 buf
+= sprintf(buf
, "%s <- %s ", show_pseudo(insn
->target
), show_pseudo(insn
->phi_src
));
388 FOR_EACH_PTR(insn
->phi_users
, phi
) {
389 buf
+= sprintf(buf
, " (%s)", show_pseudo(phi
->target
));
390 } END_FOR_EACH_PTR(phi
);
396 const char *s
= " <-";
397 buf
+= sprintf(buf
, "%s", show_pseudo(insn
->target
));
398 FOR_EACH_PTR(insn
->phi_list
, phi
) {
399 buf
+= sprintf(buf
, "%s %s", s
, show_pseudo(phi
));
401 } END_FOR_EACH_PTR(phi
);
404 case OP_LOAD
: case OP_LNOP
:
405 buf
+= sprintf(buf
, "%s <- %d[%s]", show_pseudo(insn
->target
), insn
->offset
, show_pseudo(insn
->src
));
407 case OP_STORE
: case OP_SNOP
:
408 buf
+= sprintf(buf
, "%s -> %d[%s]", show_pseudo(insn
->target
), insn
->offset
, show_pseudo(insn
->src
));
410 case OP_INLINED_CALL
:
413 if (insn
->target
&& insn
->target
!= VOID
)
414 buf
+= sprintf(buf
, "%s <- ", show_pseudo(insn
->target
));
415 buf
+= sprintf(buf
, "%s", show_pseudo(insn
->func
));
416 FOR_EACH_PTR(insn
->arguments
, arg
) {
417 buf
+= sprintf(buf
, ", %s", show_pseudo(arg
));
418 } END_FOR_EACH_PTR(arg
);
425 buf
+= sprintf(buf
, "%s <- (%d) %s",
426 show_pseudo(insn
->target
),
427 type_size(insn
->orig_type
),
428 show_pseudo(insn
->src
));
430 case OP_BINARY
... OP_BINARY_END
:
431 case OP_BINCMP
... OP_BINCMP_END
:
432 buf
+= sprintf(buf
, "%s <- %s, %s", show_pseudo(insn
->target
), show_pseudo(insn
->src1
), show_pseudo(insn
->src2
));
436 buf
+= sprintf(buf
, "%s <- %s, %s, %s", show_pseudo(insn
->target
),
437 show_pseudo(insn
->src1
), show_pseudo(insn
->src2
), show_pseudo(insn
->src3
));
441 buf
+= sprintf(buf
, "%s <- %s, %d, %d", show_pseudo(insn
->target
), show_pseudo(insn
->base
), insn
->from
, insn
->len
);
444 case OP_NOT
: case OP_NEG
:
445 buf
+= sprintf(buf
, "%s <- %s", show_pseudo(insn
->target
), show_pseudo(insn
->src1
));
449 buf
+= sprintf(buf
, "%s%d", insn
->check
? "check: " : "", insn
->increment
);
452 buf
+= sprintf(buf
, "%s between %s..%s", show_pseudo(insn
->src1
), show_pseudo(insn
->src2
), show_pseudo(insn
->src3
));
455 buf
+= sprintf(buf
, "%s <- %s", show_pseudo(insn
->target
), show_pseudo(insn
->src1
));
458 buf
+= sprintf(buf
, "%s", show_pseudo(insn
->target
));
461 buf
= show_asm(buf
, insn
);
464 buf
+= sprintf(buf
, "%s <- %s", show_pseudo(insn
->target
), show_pseudo(insn
->src
));
470 if (buf
>= buffer
+ sizeof(buffer
))
471 die("instruction buffer overflowed %td\n", buf
- buffer
);
472 do { --buf
; } while (*buf
== ' ');
477 void show_bb(struct basic_block
*bb
)
479 struct instruction
*insn
;
481 printf(".L%u:\n", bb
->nr
);
483 pseudo_t needs
, defines
;
484 printf("%s:%d\n", stream_name(bb
->pos
.stream
), bb
->pos
.line
);
486 FOR_EACH_PTR(bb
->needs
, needs
) {
487 struct instruction
*def
= needs
->def
;
488 if (def
->opcode
!= OP_PHI
) {
489 printf(" **uses %s (from .L%u)**\n", show_pseudo(needs
), def
->bb
->nr
);
492 const char *sep
= " ";
493 printf(" **uses %s (from", show_pseudo(needs
));
494 FOR_EACH_PTR(def
->phi_list
, phi
) {
497 printf("%s(%s:.L%u)", sep
, show_pseudo(phi
), phi
->def
->bb
->nr
);
499 } END_FOR_EACH_PTR(phi
);
502 } END_FOR_EACH_PTR(needs
);
504 FOR_EACH_PTR(bb
->defines
, defines
) {
505 printf(" **defines %s **\n", show_pseudo(defines
));
506 } END_FOR_EACH_PTR(defines
);
509 struct basic_block
*from
;
510 FOR_EACH_PTR(bb
->parents
, from
) {
511 printf(" **from .L%u (%s:%d:%d)**\n", from
->nr
,
512 stream_name(from
->pos
.stream
), from
->pos
.line
, from
->pos
.pos
);
513 } END_FOR_EACH_PTR(from
);
517 struct basic_block
*to
;
518 FOR_EACH_PTR(bb
->children
, to
) {
519 printf(" **to .L%u (%s:%d:%d)**\n", to
->nr
,
520 stream_name(to
->pos
.stream
), to
->pos
.line
, to
->pos
.pos
);
521 } END_FOR_EACH_PTR(to
);
525 FOR_EACH_PTR(bb
->insns
, insn
) {
526 if (!insn
->bb
&& verbose
< 2)
528 printf("\t%s\n", show_instruction(insn
));
529 } END_FOR_EACH_PTR(insn
);
530 if (!bb_terminated(bb
))
534 static void show_symbol_usage(pseudo_t pseudo
)
536 struct pseudo_user
*pu
;
539 FOR_EACH_PTR(pseudo
->users
, pu
) {
540 printf("\t%s\n", show_instruction(pu
->insn
));
541 } END_FOR_EACH_PTR(pu
);
545 void show_entry(struct entrypoint
*ep
)
548 struct basic_block
*bb
;
550 printf("%s:\n", show_ident(ep
->name
->ident
));
553 printf("ep %p: %s\n", ep
, show_ident(ep
->name
->ident
));
555 FOR_EACH_PTR(ep
->syms
, sym
) {
558 if (!sym
->pseudo
->users
)
560 printf(" sym: %p %s\n", sym
, show_ident(sym
->ident
));
561 if (sym
->ctype
.modifiers
& (MOD_EXTERN
| MOD_STATIC
| MOD_ADDRESSABLE
))
562 printf("\texternal visibility\n");
563 show_symbol_usage(sym
->pseudo
);
564 } END_FOR_EACH_PTR(sym
);
569 FOR_EACH_PTR(ep
->bbs
, bb
) {
572 if (!bb
->parents
&& !bb
->children
&& !bb
->insns
&& verbose
< 2)
576 } END_FOR_EACH_PTR(bb
);
581 static void bind_label(struct symbol
*label
, struct basic_block
*bb
, struct position pos
)
583 if (label
->bb_target
)
584 warning(pos
, "label '%s' already bound", show_ident(label
->ident
));
585 label
->bb_target
= bb
;
588 static struct basic_block
* get_bound_block(struct entrypoint
*ep
, struct symbol
*label
)
590 struct basic_block
*bb
= label
->bb_target
;
593 bb
= alloc_basic_block(ep
, label
->pos
);
594 label
->bb_target
= bb
;
599 static void finish_block(struct entrypoint
*ep
)
601 struct basic_block
*src
= ep
->active
;
602 if (bb_reachable(src
))
606 static void add_goto(struct entrypoint
*ep
, struct basic_block
*dst
)
608 struct basic_block
*src
= ep
->active
;
609 if (bb_reachable(src
)) {
610 struct instruction
*br
= alloc_instruction(OP_BR
, 0);
612 add_bb(&dst
->parents
, src
);
613 add_bb(&src
->children
, dst
);
615 add_instruction(&src
->insns
, br
);
620 static void add_one_insn(struct entrypoint
*ep
, struct instruction
*insn
)
622 struct basic_block
*bb
= ep
->active
;
624 if (bb_reachable(bb
)) {
626 add_instruction(&bb
->insns
, insn
);
630 static void set_activeblock(struct entrypoint
*ep
, struct basic_block
*bb
)
632 if (!bb_terminated(ep
->active
))
636 if (bb_reachable(bb
))
637 add_bb(&ep
->bbs
, bb
);
640 static void remove_parent(struct basic_block
*child
, struct basic_block
*parent
)
642 remove_bb_from_list(&child
->parents
, parent
, 1);
647 /* Change a "switch" into a branch */
648 void insert_branch(struct basic_block
*bb
, struct instruction
*jmp
, struct basic_block
*target
)
650 struct instruction
*br
, *old
;
651 struct basic_block
*child
;
653 /* Remove the switch */
654 old
= delete_last_instruction(&bb
->insns
);
657 br
= alloc_instruction(OP_BR
, 0);
659 br
->bb_true
= target
;
660 add_instruction(&bb
->insns
, br
);
662 FOR_EACH_PTR(bb
->children
, child
) {
663 if (child
== target
) {
664 target
= NULL
; /* Trigger just once */
667 DELETE_CURRENT_PTR(child
);
668 remove_parent(child
, bb
);
669 } END_FOR_EACH_PTR(child
);
670 PACK_PTR_LIST(&bb
->children
);
674 void insert_select(struct basic_block
*bb
, struct instruction
*br
, struct instruction
*phi_node
, pseudo_t if_true
, pseudo_t if_false
)
677 struct instruction
*select
;
679 /* Remove the 'br' */
680 delete_last_instruction(&bb
->insns
);
682 select
= alloc_instruction(OP_SEL
, phi_node
->size
);
686 use_pseudo(select
, br
->cond
, &select
->src1
);
688 target
= phi_node
->target
;
689 assert(target
->def
== phi_node
);
690 select
->target
= target
;
691 target
->def
= select
;
693 use_pseudo(select
, if_true
, &select
->src2
);
694 use_pseudo(select
, if_false
, &select
->src3
);
696 add_instruction(&bb
->insns
, select
);
697 add_instruction(&bb
->insns
, br
);
700 static inline int bb_empty(struct basic_block
*bb
)
705 /* Add a label to the currently active block, return new active block */
706 static struct basic_block
* add_label(struct entrypoint
*ep
, struct symbol
*label
)
708 struct basic_block
*bb
= label
->bb_target
;
711 set_activeblock(ep
, bb
);
715 if (!bb_reachable(bb
) || !bb_empty(bb
)) {
716 bb
= alloc_basic_block(ep
, label
->pos
);
717 set_activeblock(ep
, bb
);
719 label
->bb_target
= bb
;
723 static void add_branch(struct entrypoint
*ep
, struct expression
*expr
, pseudo_t cond
, struct basic_block
*bb_true
, struct basic_block
*bb_false
)
725 struct basic_block
*bb
= ep
->active
;
726 struct instruction
*br
;
728 if (bb_reachable(bb
)) {
729 br
= alloc_instruction(OP_CBR
, 0);
730 use_pseudo(br
, cond
, &br
->cond
);
731 br
->bb_true
= bb_true
;
732 br
->bb_false
= bb_false
;
733 add_bb(&bb_true
->parents
, bb
);
734 add_bb(&bb_false
->parents
, bb
);
735 add_bb(&bb
->children
, bb_true
);
736 add_bb(&bb
->children
, bb_false
);
737 add_one_insn(ep
, br
);
741 /* Dummy pseudo allocator */
742 pseudo_t
alloc_pseudo(struct instruction
*def
)
745 struct pseudo
* pseudo
= __alloc_pseudo(0);
746 pseudo
->type
= PSEUDO_REG
;
752 static void clear_symbol_pseudos(struct entrypoint
*ep
)
756 FOR_EACH_PTR(ep
->accesses
, pseudo
) {
757 pseudo
->sym
->pseudo
= NULL
;
758 } END_FOR_EACH_PTR(pseudo
);
761 static pseudo_t
symbol_pseudo(struct entrypoint
*ep
, struct symbol
*sym
)
768 pseudo
= sym
->pseudo
;
770 pseudo
= __alloc_pseudo(0);
772 pseudo
->type
= PSEUDO_SYM
;
774 pseudo
->ident
= sym
->ident
;
775 sym
->pseudo
= pseudo
;
776 add_pseudo(&ep
->accesses
, pseudo
);
778 /* Symbol pseudos have neither nr, usage nor def */
782 pseudo_t
value_pseudo(long long val
)
784 #define MAX_VAL_HASH 64
785 static struct pseudo_list
*prev
[MAX_VAL_HASH
];
786 int hash
= val
& (MAX_VAL_HASH
-1);
787 struct pseudo_list
**list
= prev
+ hash
;
790 FOR_EACH_PTR(*list
, pseudo
) {
791 if (pseudo
->value
== val
)
793 } END_FOR_EACH_PTR(pseudo
);
795 pseudo
= __alloc_pseudo(0);
796 pseudo
->type
= PSEUDO_VAL
;
798 add_pseudo(list
, pseudo
);
800 /* Value pseudos have neither nr, usage nor def */
804 static pseudo_t
argument_pseudo(struct entrypoint
*ep
, int nr
)
806 pseudo_t pseudo
= __alloc_pseudo(0);
807 struct instruction
*entry
= ep
->entry
;
809 pseudo
->type
= PSEUDO_ARG
;
812 add_pseudo(&entry
->arg_list
, pseudo
);
814 /* Argument pseudos have neither usage nor def */
818 pseudo_t
alloc_phi(struct basic_block
*source
, pseudo_t pseudo
, int size
)
820 struct instruction
*insn
= alloc_instruction(OP_PHISOURCE
, size
);
821 pseudo_t phi
= __alloc_pseudo(0);
824 phi
->type
= PSEUDO_PHI
;
828 use_pseudo(insn
, pseudo
, &insn
->phi_src
);
831 add_instruction(&source
->insns
, insn
);
836 * We carry the "access_data" structure around for any accesses,
837 * which simplifies things a lot. It contains all the access
838 * information in one place.
841 struct symbol
*result_type
; // result ctype
842 struct symbol
*source_type
; // source ctype
843 pseudo_t address
; // pseudo containing address ..
844 pseudo_t origval
; // pseudo for original value ..
845 unsigned int offset
, alignment
; // byte offset
846 unsigned int bit_size
, bit_offset
; // which bits
850 static void finish_address_gen(struct entrypoint
*ep
, struct access_data
*ad
)
854 static int linearize_simple_address(struct entrypoint
*ep
,
855 struct expression
*addr
,
856 struct access_data
*ad
)
858 if (addr
->type
== EXPR_SYMBOL
) {
859 linearize_one_symbol(ep
, addr
->symbol
);
860 ad
->address
= symbol_pseudo(ep
, addr
->symbol
);
863 if (addr
->type
== EXPR_BINOP
) {
864 if (addr
->right
->type
== EXPR_VALUE
) {
865 if (addr
->op
== '+') {
866 ad
->offset
+= get_expression_value(addr
->right
);
867 return linearize_simple_address(ep
, addr
->left
, ad
);
871 ad
->address
= linearize_expression(ep
, addr
);
875 static struct symbol
*base_type(struct symbol
*sym
)
877 struct symbol
*base
= sym
;
880 if (sym
->type
== SYM_NODE
)
881 base
= base
->ctype
.base_type
;
882 if (base
->type
== SYM_BITFIELD
)
883 return base
->ctype
.base_type
;
888 static int linearize_address_gen(struct entrypoint
*ep
,
889 struct expression
*expr
,
890 struct access_data
*ad
)
892 struct symbol
*ctype
= expr
->ctype
;
897 ad
->result_type
= ctype
;
898 ad
->source_type
= base_type(ctype
);
899 ad
->bit_size
= ctype
->bit_size
;
900 ad
->alignment
= ctype
->ctype
.alignment
;
901 ad
->bit_offset
= ctype
->bit_offset
;
902 if (expr
->type
== EXPR_PREOP
&& expr
->op
== '*')
903 return linearize_simple_address(ep
, expr
->unop
, ad
);
905 warning(expr
->pos
, "generating address of non-lvalue (%d)", expr
->type
);
909 static pseudo_t
add_load(struct entrypoint
*ep
, struct access_data
*ad
)
911 struct instruction
*insn
;
918 insn
= alloc_typed_instruction(OP_LOAD
, ad
->source_type
);
919 new = alloc_pseudo(insn
);
923 insn
->offset
= ad
->offset
;
924 use_pseudo(insn
, ad
->address
, &insn
->src
);
925 add_one_insn(ep
, insn
);
929 static void add_store(struct entrypoint
*ep
, struct access_data
*ad
, pseudo_t value
)
931 struct basic_block
*bb
= ep
->active
;
933 if (bb_reachable(bb
)) {
934 struct instruction
*store
= alloc_typed_instruction(OP_STORE
, ad
->source_type
);
935 store
->offset
= ad
->offset
;
936 use_pseudo(store
, value
, &store
->target
);
937 use_pseudo(store
, ad
->address
, &store
->src
);
938 add_one_insn(ep
, store
);
942 static pseudo_t
linearize_store_gen(struct entrypoint
*ep
,
944 struct access_data
*ad
)
946 pseudo_t store
= value
;
948 if (type_size(ad
->source_type
) != type_size(ad
->result_type
)) {
949 pseudo_t orig
= add_load(ep
, ad
);
950 int shift
= ad
->bit_offset
;
951 unsigned long long mask
= (1ULL << ad
->bit_size
)-1;
954 store
= add_binary_op(ep
, ad
->source_type
, OP_SHL
, value
, value_pseudo(shift
));
957 orig
= add_binary_op(ep
, ad
->source_type
, OP_AND
, orig
, value_pseudo(~mask
));
958 store
= add_binary_op(ep
, ad
->source_type
, OP_OR
, orig
, store
);
960 add_store(ep
, ad
, store
);
964 static pseudo_t
add_binary_op(struct entrypoint
*ep
, struct symbol
*ctype
, int op
, pseudo_t left
, pseudo_t right
)
966 struct instruction
*insn
= alloc_typed_instruction(op
, ctype
);
967 pseudo_t target
= alloc_pseudo(insn
);
968 insn
->target
= target
;
969 use_pseudo(insn
, left
, &insn
->src1
);
970 use_pseudo(insn
, right
, &insn
->src2
);
971 add_one_insn(ep
, insn
);
975 static pseudo_t
add_setval(struct entrypoint
*ep
, struct symbol
*ctype
, struct expression
*val
)
977 struct instruction
*insn
= alloc_typed_instruction(OP_SETVAL
, ctype
);
978 pseudo_t target
= alloc_pseudo(insn
);
979 insn
->target
= target
;
981 add_one_insn(ep
, insn
);
985 static pseudo_t
add_symbol_address(struct entrypoint
*ep
, struct symbol
*sym
)
987 struct instruction
*insn
= alloc_instruction(OP_SYMADDR
, bits_in_pointer
);
988 pseudo_t target
= alloc_pseudo(insn
);
990 insn
->target
= target
;
991 use_pseudo(insn
, symbol_pseudo(ep
, sym
), &insn
->symbol
);
992 add_one_insn(ep
, insn
);
996 static pseudo_t
linearize_load_gen(struct entrypoint
*ep
, struct access_data
*ad
)
998 pseudo_t
new = add_load(ep
, ad
);
1000 if (ad
->bit_offset
) {
1001 pseudo_t shift
= value_pseudo(ad
->bit_offset
);
1002 pseudo_t newval
= add_binary_op(ep
, ad
->source_type
, OP_LSR
, new, shift
);
1005 if (ad
->bit_size
!= type_size(ad
->source_type
))
1006 new = cast_pseudo(ep
, new, ad
->source_type
, ad
->result_type
);
1010 static pseudo_t
linearize_access(struct entrypoint
*ep
, struct expression
*expr
)
1012 struct access_data ad
= { NULL
, };
1015 if (!linearize_address_gen(ep
, expr
, &ad
))
1017 value
= linearize_load_gen(ep
, &ad
);
1018 finish_address_gen(ep
, &ad
);
1023 static pseudo_t
linearize_inc_dec(struct entrypoint
*ep
, struct expression
*expr
, int postop
)
1025 struct access_data ad
= { NULL
, };
1026 pseudo_t old
, new, one
;
1027 int op
= expr
->op
== SPECIAL_INCREMENT
? OP_ADD
: OP_SUB
;
1029 if (!linearize_address_gen(ep
, expr
->unop
, &ad
))
1032 old
= linearize_load_gen(ep
, &ad
);
1033 one
= value_pseudo(expr
->op_value
);
1034 new = add_binary_op(ep
, expr
->ctype
, op
, old
, one
);
1035 linearize_store_gen(ep
, new, &ad
);
1036 finish_address_gen(ep
, &ad
);
1037 return postop
? old
: new;
1040 static pseudo_t
add_uniop(struct entrypoint
*ep
, struct expression
*expr
, int op
, pseudo_t src
)
1042 struct instruction
*insn
= alloc_typed_instruction(op
, expr
->ctype
);
1043 pseudo_t
new = alloc_pseudo(insn
);
1046 use_pseudo(insn
, src
, &insn
->src1
);
1047 add_one_insn(ep
, insn
);
1051 static pseudo_t
linearize_slice(struct entrypoint
*ep
, struct expression
*expr
)
1053 pseudo_t pre
= linearize_expression(ep
, expr
->base
);
1054 struct instruction
*insn
= alloc_typed_instruction(OP_SLICE
, expr
->ctype
);
1055 pseudo_t
new = alloc_pseudo(insn
);
1058 insn
->from
= expr
->r_bitpos
;
1059 insn
->len
= expr
->r_nrbits
;
1060 use_pseudo(insn
, pre
, &insn
->base
);
1061 add_one_insn(ep
, insn
);
1065 static pseudo_t
linearize_regular_preop(struct entrypoint
*ep
, struct expression
*expr
)
1067 pseudo_t pre
= linearize_expression(ep
, expr
->unop
);
1072 pseudo_t zero
= value_pseudo(0);
1073 return add_binary_op(ep
, expr
->ctype
, OP_SET_EQ
, pre
, zero
);
1076 return add_uniop(ep
, expr
, OP_NOT
, pre
);
1078 return add_uniop(ep
, expr
, OP_NEG
, pre
);
1083 static pseudo_t
linearize_preop(struct entrypoint
*ep
, struct expression
*expr
)
1086 * '*' is an lvalue access, and is fundamentally different
1087 * from an arithmetic operation. Maybe it should have an
1088 * expression type of its own..
1090 if (expr
->op
== '*')
1091 return linearize_access(ep
, expr
);
1092 if (expr
->op
== SPECIAL_INCREMENT
|| expr
->op
== SPECIAL_DECREMENT
)
1093 return linearize_inc_dec(ep
, expr
, 0);
1094 return linearize_regular_preop(ep
, expr
);
1097 static pseudo_t
linearize_postop(struct entrypoint
*ep
, struct expression
*expr
)
1099 return linearize_inc_dec(ep
, expr
, 1);
1103 * Casts to pointers are "less safe" than other casts, since
1104 * they imply type-unsafe accesses. "void *" is a special
1105 * case, since you can't access through it anyway without another
1108 static struct instruction
*alloc_cast_instruction(struct symbol
*src
, struct symbol
*ctype
)
1110 int opcode
= OP_CAST
;
1111 struct symbol
*base
= ctype
;
1113 if (src
->ctype
.modifiers
& MOD_SIGNED
)
1115 if (base
->type
== SYM_NODE
)
1116 base
= base
->ctype
.base_type
;
1117 if (base
->type
== SYM_PTR
) {
1118 base
= base
->ctype
.base_type
;
1119 if (base
!= &void_ctype
)
1120 opcode
= OP_PTRCAST
;
1122 if (base
->ctype
.base_type
== &fp_type
)
1124 return alloc_typed_instruction(opcode
, ctype
);
1127 static pseudo_t
cast_pseudo(struct entrypoint
*ep
, pseudo_t src
, struct symbol
*from
, struct symbol
*to
)
1130 struct instruction
*insn
;
1136 if (from
->bit_size
< 0 || to
->bit_size
< 0)
1138 insn
= alloc_cast_instruction(from
, to
);
1139 result
= alloc_pseudo(insn
);
1140 insn
->target
= result
;
1141 insn
->orig_type
= from
;
1142 use_pseudo(insn
, src
, &insn
->src
);
1143 add_one_insn(ep
, insn
);
1147 static int opcode_sign(int opcode
, struct symbol
*ctype
)
1149 if (ctype
&& (ctype
->ctype
.modifiers
& MOD_SIGNED
)) {
1151 case OP_MULU
: case OP_DIVU
: case OP_MODU
: case OP_LSR
:
1158 static pseudo_t
linearize_assignment(struct entrypoint
*ep
, struct expression
*expr
)
1160 struct access_data ad
= { NULL
, };
1161 struct expression
*target
= expr
->left
;
1162 struct expression
*src
= expr
->right
;
1163 struct symbol
*ctype
;
1166 value
= linearize_expression(ep
, src
);
1167 if (!target
|| !linearize_address_gen(ep
, target
, &ad
))
1169 if (expr
->op
!= '=') {
1170 pseudo_t oldvalue
= linearize_load_gen(ep
, &ad
);
1172 static const int op_trans
[] = {
1173 [SPECIAL_ADD_ASSIGN
- SPECIAL_BASE
] = OP_ADD
,
1174 [SPECIAL_SUB_ASSIGN
- SPECIAL_BASE
] = OP_SUB
,
1175 [SPECIAL_MUL_ASSIGN
- SPECIAL_BASE
] = OP_MULU
,
1176 [SPECIAL_DIV_ASSIGN
- SPECIAL_BASE
] = OP_DIVU
,
1177 [SPECIAL_MOD_ASSIGN
- SPECIAL_BASE
] = OP_MODU
,
1178 [SPECIAL_SHL_ASSIGN
- SPECIAL_BASE
] = OP_SHL
,
1179 [SPECIAL_SHR_ASSIGN
- SPECIAL_BASE
] = OP_LSR
,
1180 [SPECIAL_AND_ASSIGN
- SPECIAL_BASE
] = OP_AND
,
1181 [SPECIAL_OR_ASSIGN
- SPECIAL_BASE
] = OP_OR
,
1182 [SPECIAL_XOR_ASSIGN
- SPECIAL_BASE
] = OP_XOR
1190 oldvalue
= cast_pseudo(ep
, oldvalue
, target
->ctype
, ctype
);
1191 opcode
= opcode_sign(op_trans
[expr
->op
- SPECIAL_BASE
], ctype
);
1192 dst
= add_binary_op(ep
, ctype
, opcode
, oldvalue
, value
);
1193 value
= cast_pseudo(ep
, dst
, ctype
, expr
->ctype
);
1195 value
= linearize_store_gen(ep
, value
, &ad
);
1196 finish_address_gen(ep
, &ad
);
1200 static pseudo_t
linearize_call_expression(struct entrypoint
*ep
, struct expression
*expr
)
1202 struct expression
*arg
, *fn
;
1203 struct instruction
*insn
= alloc_typed_instruction(OP_CALL
, expr
->ctype
);
1204 pseudo_t retval
, call
;
1205 struct ctype
*ctype
= NULL
;
1206 struct symbol
*fntype
;
1207 struct context
*context
;
1210 warning(expr
->pos
, "call with no type!");
1214 FOR_EACH_PTR(expr
->args
, arg
) {
1215 pseudo_t
new = linearize_expression(ep
, arg
);
1216 use_pseudo(insn
, new, add_pseudo(&insn
->arguments
, new));
1217 } END_FOR_EACH_PTR(arg
);
1222 ctype
= &fn
->ctype
->ctype
;
1226 if (fntype
->type
== SYM_NODE
)
1227 fntype
= fntype
->ctype
.base_type
;
1229 insn
->fntype
= fntype
;
1231 if (fn
->type
== EXPR_PREOP
) {
1232 if (fn
->unop
->type
== EXPR_SYMBOL
) {
1233 struct symbol
*sym
= fn
->unop
->symbol
;
1234 if (sym
->ctype
.base_type
->type
== SYM_FN
)
1238 if (fn
->type
== EXPR_SYMBOL
) {
1239 call
= symbol_pseudo(ep
, fn
->symbol
);
1241 call
= linearize_expression(ep
, fn
);
1243 use_pseudo(insn
, call
, &insn
->func
);
1245 if (expr
->ctype
!= &void_ctype
)
1246 retval
= alloc_pseudo(insn
);
1247 insn
->target
= retval
;
1248 add_one_insn(ep
, insn
);
1251 FOR_EACH_PTR(ctype
->contexts
, context
) {
1252 int in
= context
->in
;
1253 int out
= context
->out
;
1264 context_diff
= out
- in
;
1265 if (check
|| context_diff
) {
1266 insn
= alloc_instruction(OP_CONTEXT
, 0);
1267 insn
->increment
= context_diff
;
1268 insn
->check
= check
;
1269 insn
->context_expr
= context
->context
;
1270 add_one_insn(ep
, insn
);
1272 } END_FOR_EACH_PTR(context
);
1278 static pseudo_t
linearize_binop(struct entrypoint
*ep
, struct expression
*expr
)
1280 pseudo_t src1
, src2
, dst
;
1281 static const int opcode
[] = {
1282 ['+'] = OP_ADD
, ['-'] = OP_SUB
,
1283 ['*'] = OP_MULU
, ['/'] = OP_DIVU
,
1284 ['%'] = OP_MODU
, ['&'] = OP_AND
,
1285 ['|'] = OP_OR
, ['^'] = OP_XOR
,
1286 [SPECIAL_LEFTSHIFT
] = OP_SHL
,
1287 [SPECIAL_RIGHTSHIFT
] = OP_LSR
,
1288 [SPECIAL_LOGICAL_AND
] = OP_AND_BOOL
,
1289 [SPECIAL_LOGICAL_OR
] = OP_OR_BOOL
,
1293 src1
= linearize_expression(ep
, expr
->left
);
1294 src2
= linearize_expression(ep
, expr
->right
);
1295 op
= opcode_sign(opcode
[expr
->op
], expr
->ctype
);
1296 dst
= add_binary_op(ep
, expr
->ctype
, op
, src1
, src2
);
1300 static pseudo_t
linearize_logical_branch(struct entrypoint
*ep
, struct expression
*expr
, struct basic_block
*bb_true
, struct basic_block
*bb_false
);
1302 pseudo_t
linearize_cond_branch(struct entrypoint
*ep
, struct expression
*expr
, struct basic_block
*bb_true
, struct basic_block
*bb_false
);
1304 static pseudo_t
linearize_select(struct entrypoint
*ep
, struct expression
*expr
)
1306 pseudo_t cond
, true, false, res
;
1307 struct instruction
*insn
;
1309 true = linearize_expression(ep
, expr
->cond_true
);
1310 false = linearize_expression(ep
, expr
->cond_false
);
1311 cond
= linearize_expression(ep
, expr
->conditional
);
1313 insn
= alloc_typed_instruction(OP_SEL
, expr
->ctype
);
1314 if (!expr
->cond_true
)
1316 use_pseudo(insn
, cond
, &insn
->src1
);
1317 use_pseudo(insn
, true, &insn
->src2
);
1318 use_pseudo(insn
, false, &insn
->src3
);
1320 res
= alloc_pseudo(insn
);
1322 add_one_insn(ep
, insn
);
1326 static pseudo_t
add_join_conditional(struct entrypoint
*ep
, struct expression
*expr
,
1327 pseudo_t phi1
, pseudo_t phi2
)
1330 struct instruction
*phi_node
;
1337 phi_node
= alloc_typed_instruction(OP_PHI
, expr
->ctype
);
1338 use_pseudo(phi_node
, phi1
, add_pseudo(&phi_node
->phi_list
, phi1
));
1339 use_pseudo(phi_node
, phi2
, add_pseudo(&phi_node
->phi_list
, phi2
));
1340 phi_node
->target
= target
= alloc_pseudo(phi_node
);
1341 add_one_insn(ep
, phi_node
);
1345 static pseudo_t
linearize_short_conditional(struct entrypoint
*ep
, struct expression
*expr
,
1346 struct expression
*cond
,
1347 struct expression
*expr_false
)
1349 pseudo_t src1
, src2
;
1350 struct basic_block
*bb_false
;
1351 struct basic_block
*merge
= alloc_basic_block(ep
, expr
->pos
);
1352 pseudo_t phi1
, phi2
;
1353 int size
= type_size(expr
->ctype
);
1355 if (!expr_false
|| !ep
->active
)
1358 bb_false
= alloc_basic_block(ep
, expr_false
->pos
);
1359 src1
= linearize_expression(ep
, cond
);
1360 phi1
= alloc_phi(ep
->active
, src1
, size
);
1361 add_branch(ep
, expr
, src1
, merge
, bb_false
);
1363 set_activeblock(ep
, bb_false
);
1364 src2
= linearize_expression(ep
, expr_false
);
1365 phi2
= alloc_phi(ep
->active
, src2
, size
);
1366 set_activeblock(ep
, merge
);
1368 return add_join_conditional(ep
, expr
, phi1
, phi2
);
1371 static pseudo_t
linearize_conditional(struct entrypoint
*ep
, struct expression
*expr
,
1372 struct expression
*cond
,
1373 struct expression
*expr_true
,
1374 struct expression
*expr_false
)
1376 pseudo_t src1
, src2
;
1377 pseudo_t phi1
, phi2
;
1378 struct basic_block
*bb_true
, *bb_false
, *merge
;
1379 int size
= type_size(expr
->ctype
);
1381 if (!cond
|| !expr_true
|| !expr_false
|| !ep
->active
)
1383 bb_true
= alloc_basic_block(ep
, expr_true
->pos
);
1384 bb_false
= alloc_basic_block(ep
, expr_false
->pos
);
1385 merge
= alloc_basic_block(ep
, expr
->pos
);
1387 linearize_cond_branch(ep
, cond
, bb_true
, bb_false
);
1389 set_activeblock(ep
, bb_true
);
1390 src1
= linearize_expression(ep
, expr_true
);
1391 phi1
= alloc_phi(ep
->active
, src1
, size
);
1392 add_goto(ep
, merge
);
1394 set_activeblock(ep
, bb_false
);
1395 src2
= linearize_expression(ep
, expr_false
);
1396 phi2
= alloc_phi(ep
->active
, src2
, size
);
1397 set_activeblock(ep
, merge
);
1399 return add_join_conditional(ep
, expr
, phi1
, phi2
);
1402 static pseudo_t
linearize_logical(struct entrypoint
*ep
, struct expression
*expr
)
1404 struct expression
*shortcut
;
1406 shortcut
= alloc_const_expression(expr
->pos
, expr
->op
== SPECIAL_LOGICAL_OR
);
1407 shortcut
->ctype
= expr
->ctype
;
1408 if (expr
->op
== SPECIAL_LOGICAL_OR
)
1409 return linearize_conditional(ep
, expr
, expr
->left
, shortcut
, expr
->right
);
1410 return linearize_conditional(ep
, expr
, expr
->left
, expr
->right
, shortcut
);
1413 static pseudo_t
linearize_compare(struct entrypoint
*ep
, struct expression
*expr
)
1415 static const int cmpop
[] = {
1416 ['>'] = OP_SET_GT
, ['<'] = OP_SET_LT
,
1417 [SPECIAL_EQUAL
] = OP_SET_EQ
,
1418 [SPECIAL_NOTEQUAL
] = OP_SET_NE
,
1419 [SPECIAL_GTE
] = OP_SET_GE
,
1420 [SPECIAL_LTE
] = OP_SET_LE
,
1421 [SPECIAL_UNSIGNED_LT
] = OP_SET_B
,
1422 [SPECIAL_UNSIGNED_GT
] = OP_SET_A
,
1423 [SPECIAL_UNSIGNED_LTE
] = OP_SET_BE
,
1424 [SPECIAL_UNSIGNED_GTE
] = OP_SET_AE
,
1427 pseudo_t src1
= linearize_expression(ep
, expr
->left
);
1428 pseudo_t src2
= linearize_expression(ep
, expr
->right
);
1429 pseudo_t dst
= add_binary_op(ep
, expr
->ctype
, cmpop
[expr
->op
], src1
, src2
);
1434 pseudo_t
linearize_cond_branch(struct entrypoint
*ep
, struct expression
*expr
, struct basic_block
*bb_true
, struct basic_block
*bb_false
)
1438 if (!expr
|| !bb_reachable(ep
->active
))
1441 switch (expr
->type
) {
1445 add_goto(ep
, expr
->value
? bb_true
: bb_false
);
1449 add_goto(ep
, expr
->fvalue
? bb_true
: bb_false
);
1453 linearize_logical_branch(ep
, expr
, bb_true
, bb_false
);
1457 cond
= linearize_compare(ep
, expr
);
1458 add_branch(ep
, expr
, cond
, bb_true
, bb_false
);
1462 if (expr
->op
== '!')
1463 return linearize_cond_branch(ep
, expr
->unop
, bb_false
, bb_true
);
1466 cond
= linearize_expression(ep
, expr
);
1467 add_branch(ep
, expr
, cond
, bb_true
, bb_false
);
1477 static pseudo_t
linearize_logical_branch(struct entrypoint
*ep
, struct expression
*expr
, struct basic_block
*bb_true
, struct basic_block
*bb_false
)
1479 struct basic_block
*next
= alloc_basic_block(ep
, expr
->pos
);
1481 if (expr
->op
== SPECIAL_LOGICAL_OR
)
1482 linearize_cond_branch(ep
, expr
->left
, bb_true
, next
);
1484 linearize_cond_branch(ep
, expr
->left
, next
, bb_false
);
1485 set_activeblock(ep
, next
);
1486 linearize_cond_branch(ep
, expr
->right
, bb_true
, bb_false
);
1490 static pseudo_t
linearize_cast(struct entrypoint
*ep
, struct expression
*expr
)
1493 struct expression
*orig
= expr
->cast_expression
;
1498 src
= linearize_expression(ep
, orig
);
1499 return cast_pseudo(ep
, src
, orig
->ctype
, expr
->ctype
);
1502 static pseudo_t
linearize_position(struct entrypoint
*ep
, struct expression
*pos
, struct access_data
*ad
)
1504 struct expression
*init_expr
= pos
->init_expr
;
1506 ad
->offset
= pos
->init_offset
;
1507 ad
->source_type
= base_type(init_expr
->ctype
);
1508 ad
->result_type
= init_expr
->ctype
;
1509 return linearize_initializer(ep
, init_expr
, ad
);
1512 static pseudo_t
linearize_initializer(struct entrypoint
*ep
, struct expression
*initializer
, struct access_data
*ad
)
1514 switch (initializer
->type
) {
1515 case EXPR_INITIALIZER
: {
1516 struct expression
*expr
;
1517 FOR_EACH_PTR(initializer
->expr_list
, expr
) {
1518 linearize_initializer(ep
, expr
, ad
);
1519 } END_FOR_EACH_PTR(expr
);
1523 linearize_position(ep
, initializer
, ad
);
1526 pseudo_t value
= linearize_expression(ep
, initializer
);
1527 ad
->source_type
= base_type(initializer
->ctype
);
1528 ad
->result_type
= initializer
->ctype
;
1529 linearize_store_gen(ep
, value
, ad
);
1537 static void linearize_argument(struct entrypoint
*ep
, struct symbol
*arg
, int nr
)
1539 struct access_data ad
= { NULL
, };
1541 ad
.source_type
= arg
;
1542 ad
.result_type
= arg
;
1543 ad
.address
= symbol_pseudo(ep
, arg
);
1544 linearize_store_gen(ep
, argument_pseudo(ep
, nr
), &ad
);
1545 finish_address_gen(ep
, &ad
);
1548 pseudo_t
linearize_expression(struct entrypoint
*ep
, struct expression
*expr
)
1553 current_pos
= expr
->pos
;
1554 switch (expr
->type
) {
1556 linearize_one_symbol(ep
, expr
->symbol
);
1557 return add_symbol_address(ep
, expr
->symbol
);
1560 return value_pseudo(expr
->value
);
1562 case EXPR_STRING
: case EXPR_FVALUE
: case EXPR_LABEL
:
1563 return add_setval(ep
, expr
->ctype
, expr
);
1565 case EXPR_STATEMENT
:
1566 return linearize_statement(ep
, expr
->statement
);
1569 return linearize_call_expression(ep
, expr
);
1572 return linearize_binop(ep
, expr
);
1575 return linearize_logical(ep
, expr
);
1578 return linearize_compare(ep
, expr
);
1581 return linearize_select(ep
, expr
);
1583 case EXPR_CONDITIONAL
:
1584 if (!expr
->cond_true
)
1585 return linearize_short_conditional(ep
, expr
, expr
->conditional
, expr
->cond_false
);
1587 return linearize_conditional(ep
, expr
, expr
->conditional
,
1588 expr
->cond_true
, expr
->cond_false
);
1591 linearize_expression(ep
, expr
->left
);
1592 return linearize_expression(ep
, expr
->right
);
1594 case EXPR_ASSIGNMENT
:
1595 return linearize_assignment(ep
, expr
);
1598 return linearize_preop(ep
, expr
);
1601 return linearize_postop(ep
, expr
);
1604 case EXPR_FORCE_CAST
:
1605 case EXPR_IMPLIED_CAST
:
1606 return linearize_cast(ep
, expr
);
1609 return linearize_slice(ep
, expr
);
1611 case EXPR_INITIALIZER
:
1613 warning(expr
->pos
, "unexpected initializer expression (%d %d)", expr
->type
, expr
->op
);
1616 warning(expr
->pos
, "unknown expression (%d %d)", expr
->type
, expr
->op
);
1622 static pseudo_t
linearize_one_symbol(struct entrypoint
*ep
, struct symbol
*sym
)
1624 struct access_data ad
= { NULL
, };
1627 if (!sym
|| !sym
->initializer
|| sym
->initialized
)
1630 /* We need to output these puppies some day too.. */
1631 if (sym
->ctype
.modifiers
& (MOD_STATIC
| MOD_TOPLEVEL
))
1634 sym
->initialized
= 1;
1635 ad
.address
= symbol_pseudo(ep
, sym
);
1636 value
= linearize_initializer(ep
, sym
->initializer
, &ad
);
1637 finish_address_gen(ep
, &ad
);
1641 static pseudo_t
linearize_compound_statement(struct entrypoint
*ep
, struct statement
*stmt
)
1644 struct statement
*s
;
1645 struct symbol
*ret
= stmt
->ret
;
1648 FOR_EACH_PTR(stmt
->stmts
, s
) {
1649 pseudo
= linearize_statement(ep
, s
);
1650 } END_FOR_EACH_PTR(s
);
1653 struct basic_block
*bb
= add_label(ep
, ret
);
1654 struct instruction
*phi_node
= first_instruction(bb
->insns
);
1659 if (pseudo_list_size(phi_node
->phi_list
)==1) {
1660 pseudo
= first_pseudo(phi_node
->phi_list
);
1661 assert(pseudo
->type
== PSEUDO_PHI
);
1662 return pseudo
->def
->src1
;
1664 return phi_node
->target
;
1670 static pseudo_t
linearize_inlined_call(struct entrypoint
*ep
, struct statement
*stmt
)
1672 struct instruction
*insn
= alloc_instruction(OP_INLINED_CALL
, 0);
1673 struct statement
*args
= stmt
->args
;
1674 struct basic_block
*bb
;
1680 concat_symbol_list(args
->declaration
, &ep
->syms
);
1681 FOR_EACH_PTR(args
->declaration
, sym
) {
1682 pseudo_t value
= linearize_one_symbol(ep
, sym
);
1683 use_pseudo(insn
, value
, add_pseudo(&insn
->arguments
, value
));
1684 } END_FOR_EACH_PTR(sym
);
1687 insn
->target
= pseudo
= linearize_compound_statement(ep
, stmt
);
1688 use_pseudo(insn
, symbol_pseudo(ep
, stmt
->inline_fn
), &insn
->func
);
1690 if (bb
&& !bb
->insns
)
1691 bb
->pos
= stmt
->pos
;
1692 add_one_insn(ep
, insn
);
1696 static pseudo_t
linearize_context(struct entrypoint
*ep
, struct statement
*stmt
)
1698 struct instruction
*insn
= alloc_instruction(OP_CONTEXT
, 0);
1699 struct expression
*expr
= stmt
->expression
;
1702 if (expr
->type
== EXPR_VALUE
)
1703 value
= expr
->value
;
1705 insn
->increment
= value
;
1706 insn
->context_expr
= stmt
->context
;
1707 add_one_insn(ep
, insn
);
1711 static pseudo_t
linearize_range(struct entrypoint
*ep
, struct statement
*stmt
)
1713 struct instruction
*insn
= alloc_instruction(OP_RANGE
, 0);
1715 use_pseudo(insn
, linearize_expression(ep
, stmt
->range_expression
), &insn
->src1
);
1716 use_pseudo(insn
, linearize_expression(ep
, stmt
->range_low
), &insn
->src2
);
1717 use_pseudo(insn
, linearize_expression(ep
, stmt
->range_high
), &insn
->src3
);
1718 add_one_insn(ep
, insn
);
1722 ALLOCATOR(asm_rules
, "asm rules");
1723 ALLOCATOR(asm_constraint
, "asm constraints");
1725 static void add_asm_input(struct entrypoint
*ep
, struct instruction
*insn
, struct expression
*expr
,
1726 const char *constraint
, const struct ident
*ident
)
1728 pseudo_t pseudo
= linearize_expression(ep
, expr
);
1729 struct asm_constraint
*rule
= __alloc_asm_constraint(0);
1731 rule
->ident
= ident
;
1732 rule
->constraint
= constraint
;
1733 use_pseudo(insn
, pseudo
, &rule
->pseudo
);
1734 add_ptr_list(&insn
->asm_rules
->inputs
, rule
);
1737 static void add_asm_output(struct entrypoint
*ep
, struct instruction
*insn
, struct expression
*expr
,
1738 const char *constraint
, const struct ident
*ident
)
1740 struct access_data ad
= { NULL
, };
1741 pseudo_t pseudo
= alloc_pseudo(insn
);
1742 struct asm_constraint
*rule
;
1744 if (!expr
|| !linearize_address_gen(ep
, expr
, &ad
))
1746 linearize_store_gen(ep
, pseudo
, &ad
);
1747 finish_address_gen(ep
, &ad
);
1748 rule
= __alloc_asm_constraint(0);
1749 rule
->ident
= ident
;
1750 rule
->constraint
= constraint
;
1751 use_pseudo(insn
, pseudo
, &rule
->pseudo
);
1752 add_ptr_list(&insn
->asm_rules
->outputs
, rule
);
1755 static pseudo_t
linearize_asm_statement(struct entrypoint
*ep
, struct statement
*stmt
)
1758 struct expression
*expr
;
1759 struct instruction
*insn
;
1760 struct asm_rules
*rules
;
1761 const char *constraint
;
1762 struct ident
*ident
;
1764 insn
= alloc_instruction(OP_ASM
, 0);
1765 expr
= stmt
->asm_string
;
1766 if (!expr
|| expr
->type
!= EXPR_STRING
) {
1767 warning(stmt
->pos
, "expected string in inline asm");
1770 insn
->string
= expr
->string
->data
;
1772 rules
= __alloc_asm_rules(0);
1773 insn
->asm_rules
= rules
;
1775 /* Gather the inputs.. */
1779 FOR_EACH_PTR(stmt
->asm_inputs
, expr
) {
1781 case 0: /* Identifier */
1783 ident
= (struct ident
*)expr
;
1786 case 1: /* Constraint */
1788 constraint
= expr
? expr
->string
->data
: "";
1791 case 2: /* Expression */
1793 add_asm_input(ep
, insn
, expr
, constraint
, ident
);
1795 } END_FOR_EACH_PTR(expr
);
1797 add_one_insn(ep
, insn
);
1799 /* Assign the outputs */
1803 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
1805 case 0: /* Identifier */
1807 ident
= (struct ident
*)expr
;
1810 case 1: /* Constraint */
1812 constraint
= expr
? expr
->string
->data
: "";
1817 add_asm_output(ep
, insn
, expr
, constraint
, ident
);
1819 } END_FOR_EACH_PTR(expr
);
1824 static int multijmp_cmp(const void *_a
, const void *_b
)
1826 const struct multijmp
*a
= _a
;
1827 const struct multijmp
*b
= _b
;
1830 if (a
->begin
> a
->end
) {
1831 if (b
->begin
> b
->end
)
1835 if (b
->begin
> b
->end
)
1837 if (a
->begin
== b
->begin
) {
1838 if (a
->end
== b
->end
)
1840 return (a
->end
< b
->end
) ? -1 : 1;
1842 return a
->begin
< b
->begin
? -1 : 1;
1845 static void sort_switch_cases(struct instruction
*insn
)
1847 sort_list((struct ptr_list
**)&insn
->multijmp_list
, multijmp_cmp
);
1850 static pseudo_t
linearize_declaration(struct entrypoint
*ep
, struct statement
*stmt
)
1854 concat_symbol_list(stmt
->declaration
, &ep
->syms
);
1856 FOR_EACH_PTR(stmt
->declaration
, sym
) {
1857 linearize_one_symbol(ep
, sym
);
1858 } END_FOR_EACH_PTR(sym
);
1862 static pseudo_t
linearize_return(struct entrypoint
*ep
, struct statement
*stmt
)
1864 struct expression
*expr
= stmt
->expression
;
1865 struct basic_block
*bb_return
= get_bound_block(ep
, stmt
->ret_target
);
1866 struct basic_block
*active
;
1867 pseudo_t src
= linearize_expression(ep
, expr
);
1868 active
= ep
->active
;
1869 if (active
&& src
!= &void_pseudo
) {
1870 struct instruction
*phi_node
= first_instruction(bb_return
->insns
);
1873 phi_node
= alloc_typed_instruction(OP_PHI
, expr
->ctype
);
1874 phi_node
->target
= alloc_pseudo(phi_node
);
1875 phi_node
->bb
= bb_return
;
1876 add_instruction(&bb_return
->insns
, phi_node
);
1878 phi
= alloc_phi(active
, src
, type_size(expr
->ctype
));
1879 phi
->ident
= &return_ident
;
1880 use_pseudo(phi_node
, phi
, add_pseudo(&phi_node
->phi_list
, phi
));
1882 add_goto(ep
, bb_return
);
1886 static pseudo_t
linearize_switch(struct entrypoint
*ep
, struct statement
*stmt
)
1889 struct instruction
*switch_ins
;
1890 struct basic_block
*switch_end
= alloc_basic_block(ep
, stmt
->pos
);
1891 struct basic_block
*active
, *default_case
;
1892 struct multijmp
*jmp
;
1895 pseudo
= linearize_expression(ep
, stmt
->switch_expression
);
1897 active
= ep
->active
;
1898 if (!bb_reachable(active
))
1901 switch_ins
= alloc_instruction(OP_SWITCH
, 0);
1902 use_pseudo(switch_ins
, pseudo
, &switch_ins
->cond
);
1903 add_one_insn(ep
, switch_ins
);
1906 default_case
= NULL
;
1907 FOR_EACH_PTR(stmt
->switch_case
->symbol_list
, sym
) {
1908 struct statement
*case_stmt
= sym
->stmt
;
1909 struct basic_block
*bb_case
= get_bound_block(ep
, sym
);
1911 if (!case_stmt
->case_expression
) {
1912 default_case
= bb_case
;
1917 begin
= end
= case_stmt
->case_expression
->value
;
1918 if (case_stmt
->case_to
)
1919 end
= case_stmt
->case_to
->value
;
1921 jmp
= alloc_multijmp(bb_case
, end
, begin
);
1923 jmp
= alloc_multijmp(bb_case
, begin
, end
);
1926 add_multijmp(&switch_ins
->multijmp_list
, jmp
);
1927 add_bb(&bb_case
->parents
, active
);
1928 add_bb(&active
->children
, bb_case
);
1929 } END_FOR_EACH_PTR(sym
);
1931 bind_label(stmt
->switch_break
, switch_end
, stmt
->pos
);
1933 /* And linearize the actual statement */
1934 linearize_statement(ep
, stmt
->switch_statement
);
1935 set_activeblock(ep
, switch_end
);
1938 default_case
= switch_end
;
1940 jmp
= alloc_multijmp(default_case
, 1, 0);
1941 add_multijmp(&switch_ins
->multijmp_list
, jmp
);
1942 add_bb(&default_case
->parents
, active
);
1943 add_bb(&active
->children
, default_case
);
1944 sort_switch_cases(switch_ins
);
1949 static pseudo_t
linearize_iterator(struct entrypoint
*ep
, struct statement
*stmt
)
1951 struct statement
*pre_statement
= stmt
->iterator_pre_statement
;
1952 struct expression
*pre_condition
= stmt
->iterator_pre_condition
;
1953 struct statement
*statement
= stmt
->iterator_statement
;
1954 struct statement
*post_statement
= stmt
->iterator_post_statement
;
1955 struct expression
*post_condition
= stmt
->iterator_post_condition
;
1956 struct basic_block
*loop_top
, *loop_body
, *loop_continue
, *loop_end
;
1959 FOR_EACH_PTR(stmt
->iterator_syms
, sym
) {
1960 linearize_one_symbol(ep
, sym
);
1961 } END_FOR_EACH_PTR(sym
);
1962 concat_symbol_list(stmt
->iterator_syms
, &ep
->syms
);
1963 linearize_statement(ep
, pre_statement
);
1965 loop_body
= loop_top
= alloc_basic_block(ep
, stmt
->pos
);
1966 loop_continue
= alloc_basic_block(ep
, stmt
->pos
);
1967 loop_end
= alloc_basic_block(ep
, stmt
->pos
);
1969 /* An empty post-condition means that it's the same as the pre-condition */
1970 if (!post_condition
) {
1971 loop_top
= alloc_basic_block(ep
, stmt
->pos
);
1972 set_activeblock(ep
, loop_top
);
1976 linearize_cond_branch(ep
, pre_condition
, loop_body
, loop_end
);
1978 bind_label(stmt
->iterator_continue
, loop_continue
, stmt
->pos
);
1979 bind_label(stmt
->iterator_break
, loop_end
, stmt
->pos
);
1981 set_activeblock(ep
, loop_body
);
1982 linearize_statement(ep
, statement
);
1983 add_goto(ep
, loop_continue
);
1985 set_activeblock(ep
, loop_continue
);
1986 linearize_statement(ep
, post_statement
);
1987 if (!post_condition
)
1988 add_goto(ep
, loop_top
);
1990 linearize_cond_branch(ep
, post_condition
, loop_top
, loop_end
);
1991 set_activeblock(ep
, loop_end
);
1996 pseudo_t
linearize_statement(struct entrypoint
*ep
, struct statement
*stmt
)
1998 struct basic_block
*bb
;
2004 if (bb
&& !bb
->insns
)
2005 bb
->pos
= stmt
->pos
;
2006 current_pos
= stmt
->pos
;
2008 switch (stmt
->type
) {
2012 case STMT_DECLARATION
:
2013 return linearize_declaration(ep
, stmt
);
2016 return linearize_context(ep
, stmt
);
2019 return linearize_range(ep
, stmt
);
2021 case STMT_EXPRESSION
:
2022 return linearize_expression(ep
, stmt
->expression
);
2025 return linearize_asm_statement(ep
, stmt
);
2028 return linearize_return(ep
, stmt
);
2031 add_label(ep
, stmt
->case_label
);
2032 linearize_statement(ep
, stmt
->case_statement
);
2037 struct symbol
*label
= stmt
->label_identifier
;
2040 add_label(ep
, label
);
2042 return linearize_statement(ep
, stmt
->label_statement
);
2047 struct expression
*expr
;
2048 struct instruction
*goto_ins
;
2049 struct basic_block
*active
;
2052 active
= ep
->active
;
2053 if (!bb_reachable(active
))
2056 if (stmt
->goto_label
) {
2057 add_goto(ep
, get_bound_block(ep
, stmt
->goto_label
));
2061 expr
= stmt
->goto_expression
;
2065 /* This can happen as part of simplification */
2066 if (expr
->type
== EXPR_LABEL
) {
2067 add_goto(ep
, get_bound_block(ep
, expr
->label_symbol
));
2071 pseudo
= linearize_expression(ep
, expr
);
2072 goto_ins
= alloc_instruction(OP_COMPUTEDGOTO
, 0);
2073 use_pseudo(goto_ins
, pseudo
, &goto_ins
->target
);
2074 add_one_insn(ep
, goto_ins
);
2076 FOR_EACH_PTR(stmt
->target_list
, sym
) {
2077 struct basic_block
*bb_computed
= get_bound_block(ep
, sym
);
2078 struct multijmp
*jmp
= alloc_multijmp(bb_computed
, 1, 0);
2079 add_multijmp(&goto_ins
->multijmp_list
, jmp
);
2080 add_bb(&bb_computed
->parents
, ep
->active
);
2081 add_bb(&active
->children
, bb_computed
);
2082 } END_FOR_EACH_PTR(sym
);
2089 if (stmt
->inline_fn
)
2090 return linearize_inlined_call(ep
, stmt
);
2091 return linearize_compound_statement(ep
, stmt
);
2094 * This could take 'likely/unlikely' into account, and
2095 * switch the arms around appropriately..
2098 struct basic_block
*bb_true
, *bb_false
, *endif
;
2099 struct expression
*cond
= stmt
->if_conditional
;
2101 bb_true
= alloc_basic_block(ep
, stmt
->pos
);
2102 bb_false
= endif
= alloc_basic_block(ep
, stmt
->pos
);
2104 linearize_cond_branch(ep
, cond
, bb_true
, bb_false
);
2106 set_activeblock(ep
, bb_true
);
2107 linearize_statement(ep
, stmt
->if_true
);
2109 if (stmt
->if_false
) {
2110 endif
= alloc_basic_block(ep
, stmt
->pos
);
2111 add_goto(ep
, endif
);
2112 set_activeblock(ep
, bb_false
);
2113 linearize_statement(ep
, stmt
->if_false
);
2115 set_activeblock(ep
, endif
);
2120 return linearize_switch(ep
, stmt
);
2123 return linearize_iterator(ep
, stmt
);
2131 static struct entrypoint
*linearize_fn(struct symbol
*sym
, struct symbol
*base_type
)
2133 struct entrypoint
*ep
;
2134 struct basic_block
*bb
;
2136 struct instruction
*entry
;
2140 if (!base_type
->stmt
)
2143 ep
= alloc_entrypoint();
2144 bb
= alloc_basic_block(ep
, sym
->pos
);
2148 set_activeblock(ep
, bb
);
2150 entry
= alloc_instruction(OP_ENTRY
, 0);
2151 add_one_insn(ep
, entry
);
2154 concat_symbol_list(base_type
->arguments
, &ep
->syms
);
2156 /* FIXME!! We should do something else about varargs.. */
2158 FOR_EACH_PTR(base_type
->arguments
, arg
) {
2159 linearize_argument(ep
, arg
, ++i
);
2160 } END_FOR_EACH_PTR(arg
);
2162 result
= linearize_statement(ep
, base_type
->stmt
);
2163 if (bb_reachable(ep
->active
) && !bb_terminated(ep
->active
)) {
2164 struct symbol
*ret_type
= base_type
->ctype
.base_type
;
2165 struct instruction
*insn
= alloc_typed_instruction(OP_RET
, ret_type
);
2167 if (type_size(ret_type
) > 0)
2168 use_pseudo(insn
, result
, &insn
->src
);
2169 add_one_insn(ep
, insn
);
2173 * Do trivial flow simplification - branches to
2174 * branches, kill dead basicblocks etc
2176 kill_unreachable_bbs(ep
);
2179 * Turn symbols into pseudos
2181 simplify_symbol_usage(ep
);
2185 * Remove trivial instructions, and try to CSE
2189 cleanup_and_cse(ep
);
2190 pack_basic_blocks(ep
);
2191 } while (repeat_phase
& REPEAT_CSE
);
2193 kill_unreachable_bbs(ep
);
2197 clear_symbol_pseudos(ep
);
2199 /* And track pseudo register usage */
2200 track_pseudo_liveness(ep
);
2203 * Some flow optimizations can only effectively
2204 * be done when we've done liveness analysis. But
2205 * if they trigger, we need to start all over
2208 if (simplify_flow(ep
)) {
2213 /* Finally, add deathnotes to pseudos now that we have them */
2215 track_pseudo_death(ep
);
2220 struct entrypoint
*linearize_symbol(struct symbol
*sym
)
2222 struct symbol
*base_type
;
2226 current_pos
= sym
->pos
;
2227 base_type
= sym
->ctype
.base_type
;
2230 if (base_type
->type
== SYM_FN
)
2231 return linearize_fn(sym
, base_type
);