linearize.h

   1 #ifndef LINEARIZE_H
   2 #define LINEARIZE_H
   3
   4 #include "lib.h"
   5 #include "allocate.h"
   6 #include "token.h"
   7 #include "parse.h"
   8 #include "symbol.h"
   9
  10 struct instruction;
  11 DECLARE_PTR_LIST(pseudo_ptr_list, pseudo_t);
  12
  13 struct pseudo_user {
  14         struct instruction *insn;
  15         pseudo_t *userp;
  16 };
  17
  18 DECLARE_ALLOCATOR(pseudo_user);
  19 DECLARE_PTR_LIST(pseudo_user_list, struct pseudo_user);
  20
  21
  22 enum pseudo_type {
  23         PSEUDO_VOID,
  24         PSEUDO_REG,
  25         PSEUDO_SYM,
  26         PSEUDO_VAL,
  27         PSEUDO_ARG,
  28         PSEUDO_PHI,
  29 };
  30
  31 struct pseudo {
  32         int nr;
  33         enum pseudo_type type;
  34         struct pseudo_user_list *users;
  35         struct ident *ident;
  36         union {
  37                 struct symbol *sym;
  38                 struct instruction *def;
  39                 long long value;
  40         };
  41 };
  42
  43 extern struct pseudo void_pseudo;
  44
  45 #define VOID (&void_pseudo)
  46
  47 struct multijmp {
  48         struct basic_block *target;
  49         int begin, end;
  50 };
  51
  52 struct asm_constraint {
  53         pseudo_t pseudo;
  54         const char *constraint;
  55         const struct ident *ident;
  56 };
  57
  58 DECLARE_ALLOCATOR(asm_constraint);
  59 DECLARE_PTR_LIST(asm_constraint_list, struct asm_constraint);
  60
  61 struct asm_rules {
  62         struct asm_constraint_list *inputs;
  63         struct asm_constraint_list *outputs;
  64         struct asm_constraint_list *clobbers;
  65 };
  66
  67 DECLARE_ALLOCATOR(asm_rules);
  68
  69 struct instruction {
  70         unsigned opcode:8,
  71                  size:24;
  72         struct basic_block *bb;
  73         struct position pos;
  74         struct symbol *type;
  75         union {
  76                 pseudo_t target;
  77                 pseudo_t cond;          /* for branch and switch */
  78         };
  79         union {
  80                 struct /* entrypoint */ {
  81                         struct pseudo_list *arg_list;
  82                 };
  83                 struct /* branch */ {
  84                         struct basic_block *bb_true, *bb_false;
  85                 };
  86                 struct /* switch */ {
  87                         struct multijmp_list *multijmp_list;
  88                 };
  89                 struct /* phi_node */ {
  90                         struct pseudo_list *phi_list;
  91                 };
  92                 struct /* phi source */ {
  93                         pseudo_t phi_src;
  94                         struct instruction_list *phi_users;
  95                 };
  96                 struct /* unops */ {
  97                         pseudo_t src;
  98                         struct symbol *orig_type;       /* casts */
  99                         unsigned int offset;            /* memops */
 100                 };
 101                 struct /* binops and sel */ {
 102                         pseudo_t src1, src2, src3;
 103                 };
 104                 struct /* slice */ {
 105                         pseudo_t base;
 106                         unsigned from, len;
 107                 };
 108                 struct /* multijump */ {
 109                         int begin, end;
 110                 };
 111                 struct /* setval */ {
 112                         pseudo_t symbol;                /* Subtle: same offset as "src" !! */
 113                         struct expression *val;
 114                 };
 115                 struct /* call */ {
 116                         pseudo_t func;
 117                         struct pseudo_list *arguments;
 118                 };
 119                 struct /* context */ {
 120                         int increment;
 121                         int check;
 122                         struct expression *context_expr;
 123                 };
 124                 struct /* asm */ {
 125                         const char *string;
 126                         struct asm_rules *asm_rules;
 127                 };
 128         };
 129 };
 130
 131 enum opcode {
 132         OP_BADOP,
 133
 134         /* Entry */
 135         OP_ENTRY,
 136
 137         /* Terminator */
 138         OP_TERMINATOR,
 139         OP_RET = OP_TERMINATOR,
 140         OP_BR,
 141         OP_SWITCH,
 142         OP_INVOKE,
 143         OP_COMPUTEDGOTO,
 144         OP_UNWIND,
 145         OP_TERMINATOR_END = OP_UNWIND,
 146
 147         /* Binary */
 148         OP_BINARY,
 149         OP_ADD = OP_BINARY,
 150         OP_SUB,
 151         OP_MULU, OP_MULS,
 152         OP_DIVU, OP_DIVS,
 153         OP_MODU, OP_MODS,
 154         OP_SHL,
 155         OP_LSR, OP_ASR,
 156
 157         /* Logical */
 158         OP_AND,
 159         OP_OR,
 160         OP_XOR,
 161         OP_AND_BOOL,
 162         OP_OR_BOOL,
 163         OP_BINARY_END = OP_OR_BOOL,
 164
 165         /* Binary comparison */
 166         OP_BINCMP,
 167         OP_SET_EQ = OP_BINCMP,
 168         OP_SET_NE,
 169         OP_SET_LE,
 170         OP_SET_GE,
 171         OP_SET_LT,
 172         OP_SET_GT,
 173         OP_SET_B,
 174         OP_SET_A,
 175         OP_SET_BE,
 176         OP_SET_AE,
 177         OP_BINCMP_END = OP_SET_AE,
 178
 179         /* Uni */
 180         OP_NOT,
 181         OP_NEG,
 182
 183         /* Select - three input values */
 184         OP_SEL,
 185
 186         /* Memory */
 187         OP_MALLOC,
 188         OP_FREE,
 189         OP_ALLOCA,
 190         OP_LOAD,
 191         OP_STORE,
 192         OP_SETVAL,
 193         OP_SYMADDR,
 194         OP_GET_ELEMENT_PTR,
 195
 196         /* Other */
 197         OP_PHI,
 198         OP_PHISOURCE,
 199         OP_CAST,
 200         OP_SCAST,
 201         OP_FPCAST,
 202         OP_PTRCAST,
 203         OP_INLINED_CALL,
 204         OP_CALL,
 205         OP_VANEXT,
 206         OP_VAARG,
 207         OP_SLICE,
 208         OP_SNOP,
 209         OP_LNOP,
 210         OP_NOP,
 211         OP_DEATHNOTE,
 212         OP_ASM,
 213
 214         /* Sparse tagging (line numbers, context, whatever) */
 215         OP_CONTEXT,
 216         OP_RANGE,
 217
 218         /* Needed to translate SSA back to normal form */
 219         OP_COPY,
 220 };
 221
 222 struct basic_block_list;
 223 struct instruction_list;
 224
 225 struct basic_block {
 226         struct position pos;
 227         unsigned long generation;
 228         int context;
 229         struct entrypoint *ep;
 230         struct basic_block_list *parents; /* sources */
 231         struct basic_block_list *children; /* destinations */
 232         struct instruction_list *insns; /* Linear list of instructions */
 233         struct pseudo_list *needs, *defines;
 234 };
 235
 236 static inline int is_branch_goto(struct instruction *br)
 237 {
 238         return br && br->opcode==OP_BR && (!br->bb_true || !br->bb_false);
 239 }
 240
 241 static inline void add_bb(struct basic_block_list **list, struct basic_block *bb)
 242 {
 243         add_ptr_list(list, bb);
 244 }
 245
 246 static inline void add_instruction(struct instruction_list **list, struct instruction *insn)
 247 {
 248         add_ptr_list(list, insn);
 249 }
 250
 251 static inline void add_multijmp(struct multijmp_list **list, struct multijmp *multijmp)
 252 {
 253         add_ptr_list(list, multijmp);
 254 }
 255
 256 static inline pseudo_t *add_pseudo(struct pseudo_list **list, pseudo_t pseudo)
 257 {
 258         return add_ptr_list(list, pseudo);
 259 }
 260
 261 static inline int remove_pseudo(struct pseudo_list **list, pseudo_t pseudo)
 262 {
 263         return delete_ptr_list_entry((struct ptr_list **)list, pseudo, 0) != 0;
 264 }
 265
 266 static inline int bb_terminated(struct basic_block *bb)
 267 {
 268         struct instruction *insn;
 269         if (!bb)
 270                 return 0;
 271         insn = last_instruction(bb->insns);
 272         return insn && insn->opcode >= OP_TERMINATOR
 273                     && insn->opcode <= OP_TERMINATOR_END;
 274 }
 275
 276 static inline int bb_reachable(struct basic_block *bb)
 277 {
 278         return bb != NULL;
 279 }
 280
 281 static inline void add_pseudo_ptr(pseudo_t *ptr, struct pseudo_ptr_list **list)
 282 {
 283         add_ptr_list(list, ptr);
 284 }
 285
 286 static inline void add_pseudo_user_ptr(struct pseudo_user *user, struct pseudo_user_list **list)
 287 {
 288         add_ptr_list(list, user);
 289 }
 290
 291 static inline int has_use_list(pseudo_t p)
 292 {
 293         return (p && p->type != PSEUDO_VOID && p->type != PSEUDO_VAL);
 294 }
 295
 296 static inline struct pseudo_user *alloc_pseudo_user(struct instruction *insn, pseudo_t *pp)
 297 {
 298         struct pseudo_user *user = __alloc_pseudo_user(0);
 299         user->userp = pp;
 300         user->insn = insn;
 301         return user;
 302 }
 303
 304 static inline void use_pseudo(struct instruction *insn, pseudo_t p, pseudo_t *pp)
 305 {
 306         *pp = p;
 307         if (has_use_list(p))
 308                 add_pseudo_user_ptr(alloc_pseudo_user(insn, pp), &p->users);
 309 }
 310
 311 static inline void remove_bb_from_list(struct basic_block_list **list, struct basic_block *entry, int count)
 312 {
 313         delete_ptr_list_entry((struct ptr_list **)list, entry, count);
 314 }
 315
 316 static inline void replace_bb_in_list(struct basic_block_list **list,
 317         struct basic_block *old, struct basic_block *new, int count)
 318 {
 319         replace_ptr_list_entry((struct ptr_list **)list, old, new, count);
 320 }
 321
 322 struct entrypoint {
 323         struct symbol *name;
 324         struct symbol_list *syms;
 325         struct pseudo_list *accesses;
 326         struct basic_block_list *bbs;
 327         struct basic_block *active;
 328         struct instruction *entry;
 329 };
 330
 331 extern void insert_select(struct basic_block *bb, struct instruction *br, struct instruction *phi, pseudo_t if_true, pseudo_t if_false);
 332 extern void insert_branch(struct basic_block *bb, struct instruction *br, struct basic_block *target);
 333
 334 pseudo_t alloc_phi(struct basic_block *source, pseudo_t pseudo, int size);
 335 pseudo_t alloc_pseudo(struct instruction *def);
 336 pseudo_t value_pseudo(long long val);
 337
 338 struct entrypoint *linearize_symbol(struct symbol *sym);
 339 int unssa(struct entrypoint *ep);
 340 void show_entry(struct entrypoint *ep);
 341 const char *show_pseudo(pseudo_t pseudo);
 342 void show_bb(struct basic_block *bb);
 343 const char *show_instruction(struct instruction *insn);
 344
 345 #endif /* LINEARIZE_H */
 346