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