参照元†
struct GTY(()) emit_status {
void ensure_regno_capacity ();
/* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
After rtl generation, it is 1 plus the largest register number used. */
int x_reg_rtx_no;
/* Lowest label number in current function. */
int x_first_label_num;
/* seq.first and seq.last are the ends of the doubly-linked chain of
rtl for the current function. Both are reset to null at the
start of rtl generation for the function.
start_sequence saves both of these on seq.next and then starts
a new, nested sequence of insns.
seq.next is a stack of pending (incomplete) sequences saved by
start_sequence. Each element describes one pending sequence.
The main insn-chain is the last element of the chain. */
struct sequence_stack seq;
/* INSN_UID for next insn emitted.
Reset to 1 for each function compiled. */
int x_cur_insn_uid;
/* INSN_UID for next debug insn emitted. Only used if
--param min-nondebug-insn-uid=<value> is given with nonzero value. */
int x_cur_debug_insn_uid;
/* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
vectors. Since these vectors are needed during the expansion phase when
the total number of registers in the function is not yet known, the
vectors are copied and made bigger when necessary. */
int regno_pointer_align_length;
/* Indexed by pseudo register number, if nonzero gives the known alignment
for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
Allocated in parallel with x_regno_reg_rtx. */
unsigned char * GTY((skip)) regno_pointer_align;
};
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