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概要[]

実装[]

56 struct emit_status GTY(())
57 {
  58   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  59      After rtl generation, it is 1 plus the largest register number used.  */
60   int x_reg_rtx_no;
61 
  62   /* Lowest label number in current function.  */
63   int x_first_label_num;
64 
  65   /* The ends of the doubly-linked chain of rtl for the current function.
  66      Both are reset to null at the start of rtl generation for the function.
  67 
  68      start_sequence saves both of these on `sequence_stack' and then starts
  69      a new, nested sequence of insns.  */
70   rtx x_first_insn;
71   rtx x_last_insn;
72 
  73   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  74      Each element describes one pending sequence.
  75      The main insn-chain is saved in the last element of the chain,
  76      unless the chain is empty.  */
77   struct sequence_stack *sequence_stack;
78 
  79   /* INSN_UID for next insn emitted.
  80      Reset to 1 for each function compiled.  */
81   int x_cur_insn_uid;
82 
  83   /* Location the last line-number NOTE emitted.
  84      This is used to avoid generating duplicates.  */
85   location_t x_last_location;
86 
  87   /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
  88      vectors.  Since these vectors are needed during the expansion phase when
  89      the total number of registers in the function is not yet known, the
  90      vectors are copied and made bigger when necessary.  */
91   int regno_pointer_align_length;
92 
  93   /* Indexed by pseudo register number, if nonzero gives the known alignment
  94      for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
  95      Allocated in parallel with x_regno_reg_rtx.  */
96   unsigned char * GTY ((length ("%h.x_reg_rtx_no")))
97     regno_pointer_align;
98 
  99   /* Indexed by pseudo register number, gives the rtx for that pseudo.
 100      Allocated in parallel with regno_pointer_align.  */
101   rtx * GTY ((length ("%h.x_reg_rtx_no"))) x_regno_reg_rtx;
102 };


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