123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
typedef short valnum;
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typedef struct entity *entity_p;
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typedef struct avail *avail_p;
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typedef struct token *token_p;
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typedef struct occur *occur_p;
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struct token {
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valnum tk_vn;
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offset tk_size;
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line_p tk_lfirst; /* Textually first instruction, involved
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* in pushing this token.
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*/
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};
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/* We distinguish these entities. */
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#define ENCONST 0
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#define ENLOCAL 1
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#define ENEXTERNAL 2
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#define ENINDIR 3
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#define ENOFFSETTED 4
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#define ENALOCAL 5
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#define ENAEXTERNAL 6
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#define ENAOFFSETTED 7
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#define ENALOCBASE 8
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#define ENAARGBASE 9
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#define ENPROC 10
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#define ENFZER 11
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#define ENARRELEM 12
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#define ENLOCBASE 13
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#define ENHEAPPTR 14
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#define ENIGNMASK 15
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struct entity {
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valnum en_vn;
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bool en_static;
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byte en_kind; /* ENLOCAL, ENEXTERNAL, etc. */
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offset en_size;
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union {
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offset en__val; /* ENCONST. */
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offset en__loc; /* ENLOCAL, ENALOCAL. */
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obj_p en__ext; /* ENEXTERNAL, ENAEXTERNAL. */
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valnum en__ind; /* ENINDIR. */
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struct {
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valnum en__base;
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offset en__off;
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} en_offs; /* ENOFFSETTED, ENAOFFSETTED. */
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offset en__levels; /* ENALOCBASE, ENAARGBASE. */
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proc_p en__pro; /* ENPROC. */
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struct {
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valnum en__arbase;
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valnum en__index;
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valnum en__adesc;
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} en_arr; /* ENARRELEM. */
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} en_inf;
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};
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/* Macros to increase ease of use. */
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#define en_val en_inf.en__val
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#define en_loc en_inf.en__loc
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#define en_ext en_inf.en__ext
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#define en_ind en_inf.en__ind
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#define en_base en_inf.en_offs.en__base
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#define en_off en_inf.en_offs.en__off
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#define en_levels en_inf.en__levels
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#define en_pro en_inf.en__pro
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#define en_arbase en_inf.en_arr.en__arbase
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#define en_index en_inf.en_arr.en__index
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#define en_adesc en_inf.en_arr.en__adesc
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struct occur {
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line_p oc_lfirst; /* First instruction of expression. */
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line_p oc_llast; /* Last one. */
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bblock_p oc_belongs; /* Basic block it belongs to. */
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};
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/* We distinguish these groups of instructions. */
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#define SIMPLE_LOAD 0
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#define EXPENSIVE_LOAD 1
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#define LOAD_ARRAY 2
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#define STORE_DIRECT 3
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#define STORE_INDIR 4
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#define STORE_ARRAY 5
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#define UNAIR_OP 6
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#define BINAIR_OP 7
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#define TERNAIR_OP 8
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#define KILL_ENTITY 9
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#define SIDE_EFFECTS 10
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#define FIDDLE_STACK 11
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#define IGNORE 12
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#define HOPELESS 13
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#define BBLOCK_END 14
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struct avail {
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avail_p av_before; /* Ptr to earlier discovered expressions. */
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byte av_instr; /* Operator instruction. */
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offset av_size;
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line_p av_found; /* Line where expression is first found. */
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lset av_occurs; /* Set of recurrences of expression. */
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entity_p av_saveloc; /* Local where result is put in. */
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valnum av_result;
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union {
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valnum av__operand; /* EXPENSIVE_LOAD, UNAIR_OP. */
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struct {
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valnum av__oleft;
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valnum av__oright;
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} av_2; /* BINAIR_OP. */
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struct {
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valnum av__ofirst;
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valnum av__osecond;
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valnum av__othird;
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} av_3; /* TERNAIR_OP. */
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} av_o;
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};
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/* Macros to increase ease of use. */
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#define av_operand av_o.av__operand
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#define av_oleft av_o.av_2.av__oleft
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#define av_oright av_o.av_2.av__oright
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#define av_ofirst av_o.av_3.av__ofirst
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#define av_osecond av_o.av_3.av__osecond
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#define av_othird av_o.av_3.av__othird
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extern int Scs; /* Number of optimizations found. */
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