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_SET_B,
 105         OP_SET_A,
 106         OP_SET_BE,
 107         OP_SET_AE,
 108         OP_BINCMP_END = OP_SET_AE,
 109
 110         /* Uni */
 111         OP_NOT,
 112         OP_NEG,
 113
 114         /* Memory */
 115         OP_MALLOC,
 116         OP_FREE,
 117         OP_ALLOCA,
 118         OP_LOAD,
 119         OP_STORE,
 120         OP_SETVAL,
 121         OP_GET_ELEMENT_PTR,
 122
 123         /* Other */
 124         OP_PHI,
 125         OP_CAST,
 126         OP_CALL,
 127         OP_VANEXT,
 128         OP_VAARG,
 129 };
 130
 131 struct basic_block_list;
 132 struct instruction_list;
 133
 134 /*
 135  * Basic block flags. Right now we only have one, which keeps
 136  * track (at build time) whether the basic block has been branched
 137  * out of yet.
 138  */
 139 #define BB_REACHABLE    0x00000001
 140
 141 struct basic_block {
 142         unsigned long flags;            /* BB status flags */
 143         struct basic_block_list *parents; /* sources */
 144         struct instruction_list *insns; /* Linear list of instructions */
 145 };
 146
 147 static inline int is_branch_goto(struct instruction *br)
 148 {
 149         return br && br->opcode==OP_BR && (!br->bb_true || !br->bb_false);
 150 }
 151
 152 static inline void add_bb(struct basic_block_list **list, struct basic_block *bb)
 153 {
 154         add_ptr_list((struct ptr_list **)list, bb);
 155 }
 156
 157 static inline void add_instruction(struct instruction_list **list, struct instruction *insn)
 158 {
 159         add_ptr_list((struct ptr_list **)list, insn);
 160 }
 161
 162 static inline void add_multijmp(struct multijmp_list **list, struct multijmp *multijmp)
 163 {
 164         add_ptr_list((struct ptr_list **)list, multijmp);
 165 }
 166
 167 static inline void add_phi(struct phi_list **list, struct phi *phi)
 168 {
 169         add_ptr_list((struct ptr_list **)list, phi);
 170 }
 171
 172 static inline void add_pseudo(struct pseudo_list **list, struct pseudo *pseudo)
 173 {
 174         add_ptr_list((struct ptr_list **)list, pseudo);
 175 }
 176
 177
 178 static inline int bb_terminated(struct basic_block *bb)
 179 {
 180         struct instruction *insn;
 181         if (!bb)
 182                 return 0;
 183         insn = last_instruction(bb->insns);
 184         return insn && insn->opcode >= OP_RET && insn->opcode <= OP_UNWIND;
 185 }
 186
 187 static inline int bb_reachable(struct basic_block *bb)
 188 {
 189         return bb && (bb->parents || (bb->flags & BB_REACHABLE));
 190 }
 191
 192 struct entrypoint {
 193         struct symbol *name;
 194         struct symbol_list *syms;
 195         struct basic_block_list *bbs;
 196         struct basic_block *active;
 197 };
 198
 199 struct entrypoint *linearize_symbol(struct symbol *sym);
 200 void show_entry(struct entrypoint *ep);
 201
 202 #endif /* LINEARIZE_H */
 203