linearize.h

   1 #ifndef LINEARIZE_H
   2 #define LINEARIZE_H
   3
   4 #include "lib.h"
   5 #include "token.h"
   6 #include "parse.h"
   7 #include "symbol.h"
   8
   9 /* Silly pseudo define. Do this right some day */
  10 struct pseudo {
  11         int nr;
  12 };
  13
  14 typedef struct pseudo *pseudo_t;
  15
  16 extern struct pseudo void_pseudo;
  17
  18 #define VOID (&void_pseudo)
  19
  20 struct multijmp {
  21         struct basic_block *target;
  22         int begin, end;
  23 };
  24
  25 struct phi {
  26         struct basic_block *source;
  27         pseudo_t pseudo;
  28 };
  29
  30 struct instruction {
  31         struct symbol *type;
  32         int opcode;
  33         union {
  34                 pseudo_t target;
  35                 pseudo_t cond;          /* for branch and switch */
  36         };
  37         union {
  38                 struct /* branch */ {
  39                         struct basic_block *bb_true, *bb_false;
  40                 };
  41                 struct /* switch */ {
  42                         struct multijmp_list *multijmp_list;
  43                 };
  44                 struct /* phi_node */ {
  45                         struct phi_list *phi_list;
  46                 };
  47                 struct /* unops */ {
  48                         struct symbol *orig_type;       /* casts */
  49                         pseudo_t src;
  50                 };
  51                 struct /* binops */ {
  52                         pseudo_t src1, src2;
  53                 };
  54                 struct /* multijump */ {
  55                         int begin, end;
  56                 };
  57                 struct /* setval */ {
  58                         struct expression *val;
  59                 };
  60                 struct /* call */ {
  61                         pseudo_t func;
  62                         struct pseudo_list *arguments;
  63                 };
  64         };
  65 };
  66
  67 enum opcode {
  68         OP_BADOP,
  69         /* Terminator */
  70         OP_TERMINATOR,
  71         OP_RET = OP_TERMINATOR,
  72         OP_BR,
  73         OP_SWITCH,
  74         OP_INVOKE,
  75         OP_COMPUTEDGOTO,
  76         OP_UNWIND,
  77         OP_TERMINATOR_END = OP_UNWIND,
  78
  79         /* Binary */
  80         OP_BINARY,
  81         OP_ADD = OP_BINARY,
  82         OP_SUB,
  83         OP_MUL,
  84         OP_DIV,
  85         OP_MOD,
  86         OP_SHL,
  87         OP_SHR,
  88         OP_SEL,
  89
  90         /* Logical */
  91         OP_AND,
  92         OP_OR,
  93         OP_XOR,
  94         OP_AND_BOOL,
  95         OP_OR_BOOL,
  96         OP_BINARY_END = OP_OR_BOOL,
  97
  98         /* Binary comparison */
  99         OP_BINCMP,
 100         OP_SET_EQ = OP_BINCMP,
 101         OP_SET_NE,
 102         OP_SET_LE,
 103         OP_SET_GE,
 104         OP_SET_LT,
 105         OP_SET_GT,
 106         OP_SET_B,
 107         OP_SET_A,
 108         OP_SET_BE,
 109         OP_SET_AE,
 110         OP_BINCMP_END = OP_SET_AE,
 111
 112         /* Uni */
 113         OP_NOT,
 114         OP_NEG,
 115
 116         /* Setcc - always in combination with a select or conditional branch */
 117         OP_SETCC,
 118
 119         /* Memory */
 120         OP_MALLOC,
 121         OP_FREE,
 122         OP_ALLOCA,
 123         OP_LOAD,
 124         OP_STORE,
 125         OP_SETVAL,
 126         OP_GET_ELEMENT_PTR,
 127
 128         /* Other */
 129         OP_PHI,
 130         OP_CAST,
 131         OP_CALL,
 132         OP_VANEXT,
 133         OP_VAARG,
 134 };
 135
 136 struct basic_block_list;
 137 struct instruction_list;
 138
 139 /*
 140  * Basic block flags. Right now we only have one, which keeps
 141  * track (at build time) whether the basic block has been branched
 142  * out of yet.
 143  */
 144 #define BB_REACHABLE    0x00000001
 145
 146 struct basic_block {
 147         unsigned long flags;            /* BB status flags */
 148         struct basic_block_list *parents; /* sources */
 149         struct instruction_list *insns; /* Linear list of instructions */
 150 };
 151
 152 static inline int is_branch_goto(struct instruction *br)
 153 {
 154         return br && br->opcode==OP_BR && (!br->bb_true || !br->bb_false);
 155 }
 156
 157 static inline void add_bb(struct basic_block_list **list, struct basic_block *bb)
 158 {
 159         add_ptr_list((struct ptr_list **)list, bb);
 160 }
 161
 162 static inline void add_instruction(struct instruction_list **list, struct instruction *insn)
 163 {
 164         add_ptr_list((struct ptr_list **)list, insn);
 165 }
 166
 167 static inline void add_multijmp(struct multijmp_list **list, struct multijmp *multijmp)
 168 {
 169         add_ptr_list((struct ptr_list **)list, multijmp);
 170 }
 171
 172 static inline void add_phi(struct phi_list **list, struct phi *phi)
 173 {
 174         add_ptr_list((struct ptr_list **)list, phi);
 175 }
 176
 177 static inline void add_pseudo(struct pseudo_list **list, struct pseudo *pseudo)
 178 {
 179         add_ptr_list((struct ptr_list **)list, pseudo);
 180 }
 181
 182
 183 static inline int bb_terminated(struct basic_block *bb)
 184 {
 185         struct instruction *insn;
 186         if (!bb)
 187                 return 0;
 188         insn = last_instruction(bb->insns);
 189         return insn && insn->opcode >= OP_RET && insn->opcode <= OP_UNWIND;
 190 }
 191
 192 static inline int bb_reachable(struct basic_block *bb)
 193 {
 194         return bb && (bb->parents || (bb->flags & BB_REACHABLE));
 195 }
 196
 197 struct entrypoint {
 198         struct symbol *name;
 199         struct symbol_list *syms;
 200         struct basic_block_list *bbs;
 201         struct basic_block *active;
 202 };
 203
 204 struct entrypoint *linearize_symbol(struct symbol *sym);
 205 void show_entry(struct entrypoint *ep);
 206
 207 #endif /* LINEARIZE_H */
 208