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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
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7
tcg/aarch64/tcg-target.inc.c
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@ -1306,12 +1306,13 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
#ifndef USE_DIRECT_JUMP
#error "USE_DIRECT_JUMP required for aarch64"
#endif
tcg_debug_assert(s->tb_jmp_offset != NULL); /* consistency for USE_DIRECT_JUMP */
s->tb_jmp_offset[a0] = tcg_current_code_size(s);
/* consistency for USE_DIRECT_JUMP */
tcg_debug_assert(s->tb_jmp_insn_offset != NULL);
s->tb_jmp_insn_offset[a0] = tcg_current_code_size(s);
/* actual branch destination will be patched by
aarch64_tb_set_jmp_target later, beware retranslation. */
tcg_out_goto_noaddr(s);
s->tb_next_offset[a0] = tcg_current_code_size(s);
s->tb_jmp_reset_offset[a0] = tcg_current_code_size(s);
break;
case INDEX_op_br: