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tcg: Clean up direct block chaining data fields

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Briefly describe in a comment how direct block chaining is done. It
should help in understanding of the following data fields.

Rename some fields in TranslationBlock and TCGContext structures to
better reflect their purpose (dropping excessive 'tb_' prefix in
TranslationBlock but keeping it in TCGContext):
   tb_next_offset  =>  jmp_reset_offset
   tb_jmp_offset   =>  jmp_insn_offset
   tb_next         =>  jmp_target_addr
   jmp_next        =>  jmp_list_next
   jmp_first       =>  jmp_list_first

Avoid using a magic constant as an invalid offset which is used to
indicate that there's no n-th jump generated.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Sergey Fedorov 2016-04-10 23:35:45 +03:00 • committed by Richard Henderson
parent 7ba6a512ae
commit f309101c26
12 changed files with 96 additions and 78 deletions
Download patch file Download diff file Expand all files Collapse all files

11
tcg/s390/tcg-target.inc.c
View file

@ -1717,7 +1717,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_offset) {
if (s->tb_jmp_insn_offset) {
/* branch displacement must be aligned for atomic patching;
* see if we need to add extra nop before branch
*/
@ -1725,15 +1725,16 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
tcg_out16(s, NOP);
}
tcg_out16(s, RIL_BRCL | (S390_CC_ALWAYS << 4));
s->tb_jmp_offset[args[0]] = tcg_current_code_size(s);
s->tb_jmp_insn_offset[args[0]] = tcg_current_code_size(s);
s->code_ptr += 2;
} else {
/* load address stored at s->tb_next + args[0] */
tcg_out_ld_abs(s, TCG_TYPE_PTR, TCG_TMP0, s->tb_next + args[0]);
/* load address stored at s->tb_jmp_target_addr + args[0] */
tcg_out_ld_abs(s, TCG_TYPE_PTR, TCG_TMP0,
s->tb_jmp_target_addr + args[0]);
/* and go there */
tcg_out_insn(s, RR, BCR, S390_CC_ALWAYS, TCG_TMP0);
}
s->tb_next_offset[args[0]] = tcg_current_code_size(s);
s->tb_jmp_reset_offset[args[0]] = tcg_current_code_size(s);
break;
OP_32_64(ld8u):