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_UNWIND,
  76         OP_TERMINATOR_END = OP_UNWIND,
  77
  78         /* Binary */
  79         OP_BINARY,
  80         OP_ADD = OP_BINARY,
  81         OP_SUB,
  82         OP_MUL,
  83         OP_DIV,
  84         OP_MOD,
  85         OP_SHL,
  86         OP_SHR,
  87         OP_BINARY_END = OP_SHR,
  88
  89         /* Logical */
  90         OP_LOGICAL,
  91         OP_AND = OP_LOGICAL,
  92         OP_OR,
  93         OP_XOR,
  94         OP_LOGICAL_END = OP_XOR,
  95
  96         /* Binary comparison */
  97         OP_BINCMP,
  98         OP_SET_EQ = OP_BINCMP,
  99         OP_SET_NE,
 100         OP_SET_LE,
 101         OP_SET_GE,
 102         OP_SET_LT,
 103         OP_SET_GT,
 104         OP_BINCMP_END = OP_SET_GT,
 105
 106         /* Uni */
 107         OP_NOT,
 108         OP_NEG,
 109
 110         /* Memory */
 111         OP_MALLOC,
 112         OP_FREE,
 113         OP_ALLOCA,
 114         OP_LOAD,
 115         OP_STORE,
 116         OP_SETVAL,
 117         OP_GET_ELEMENT_PTR,
 118
 119         /* Other */
 120         OP_PHI,
 121         OP_CAST,
 122         OP_CALL,
 123         OP_VANEXT,
 124         OP_VAARG,
 125 };
 126
 127 struct basic_block_list;
 128 struct instruction_list;
 129
 130 /*
 131  * Basic block flags. Right now we only have one, which keeps
 132  * track (at build time) whether the basic block has been branched
 133  * out of yet.
 134  */
 135 #define BB_REACHABLE    0x00000001
 136
 137 struct basic_block {
 138         unsigned long flags;            /* BB status flags */
 139         struct basic_block_list *parents; /* sources */
 140         struct instruction_list *insns; /* Linear list of instructions */
 141 };
 142
 143 static inline int is_branch_goto(struct instruction *br)
 144 {
 145         return br && br->opcode==OP_BR && (!br->bb_true || !br->bb_false);
 146 }
 147
 148 static inline void add_bb(struct basic_block_list **list, struct basic_block *bb)
 149 {
 150         add_ptr_list((struct ptr_list **)list, bb);
 151 }
 152
 153 static inline void add_instruction(struct instruction_list **list, struct instruction *insn)
 154 {
 155         add_ptr_list((struct ptr_list **)list, insn);
 156 }
 157
 158 static inline void add_multijmp(struct multijmp_list **list, struct multijmp *multijmp)
 159 {
 160         add_ptr_list((struct ptr_list **)list, multijmp);
 161 }
 162
 163 static inline void add_phi(struct phi_list **list, struct phi *phi)
 164 {
 165         add_ptr_list((struct ptr_list **)list, phi);
 166 }
 167
 168 static inline void add_pseudo(struct pseudo_list **list, struct pseudo *pseudo)
 169 {
 170         add_ptr_list((struct ptr_list **)list, pseudo);
 171 }
 172
 173
 174 static inline int bb_terminated(struct basic_block *bb)
 175 {
 176         struct instruction *insn;
 177         if (!bb)
 178                 return 0;
 179         insn = last_instruction(bb->insns);
 180         return insn && insn->opcode >= OP_RET && insn->opcode <= OP_UNWIND;
 181 }
 182
 183 static inline int bb_reachable(struct basic_block *bb)
 184 {
 185         return bb && (bb->parents || (bb->flags & BB_REACHABLE));
 186 }
 187
 188 struct entrypoint {
 189         struct symbol *name;
 190         struct symbol_list *syms;
 191         struct basic_block_list *bbs;
 192         struct basic_block *active;
 193 };
 194
 195 struct entrypoint *linearize_symbol(struct symbol *sym);
 196 void show_entry(struct entrypoint *ep);
 197
 198 #endif /* LINEARIZE_H */
 199