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authorSergey Fedorov <serge.fdrv@gmail.com>2016-04-10 23:35:45 +0300
committerRichard Henderson <rth@twiddle.net>2016-05-12 14:06:41 -1000
commitf309101c26b59641fc1aa8fb2a98a5441cdaea03 (patch)
tree9c0509fddf84c84027cc9bf8292219c3dbe62c12 /translate-all.c
parent7ba6a512ae439c98c0c1f0f4348c079d90f9dd9d (diff)
tcg: Clean up direct block chaining data fields
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>
Diffstat (limited to 'translate-all.c')
-rw-r--r--translate-all.c51
1 files changed, 27 insertions, 24 deletions
diff --git a/translate-all.c b/translate-all.c
index 79a515dde7..c6613d13c9 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -931,7 +931,7 @@ static inline void tb_jmp_remove(TranslationBlock *tb, int n)
TranslationBlock *tb1, **ptb;
unsigned int n1;
- ptb = &tb->jmp_next[n];
+ ptb = &tb->jmp_list_next[n];
tb1 = *ptb;
if (tb1) {
/* find tb(n) in circular list */
@@ -943,15 +943,15 @@ static inline void tb_jmp_remove(TranslationBlock *tb, int n)
break;
}
if (n1 == 2) {
- ptb = &tb1->jmp_first;
+ ptb = &tb1->jmp_list_first;
} else {
- ptb = &tb1->jmp_next[n1];
+ ptb = &tb1->jmp_list_next[n1];
}
}
/* now we can suppress tb(n) from the list */
- *ptb = tb->jmp_next[n];
+ *ptb = tb->jmp_list_next[n];
- tb->jmp_next[n] = NULL;
+ tb->jmp_list_next[n] = NULL;
}
}
@@ -959,7 +959,8 @@ static inline void tb_jmp_remove(TranslationBlock *tb, int n)
another TB */
static inline void tb_reset_jump(TranslationBlock *tb, int n)
{
- tb_set_jmp_target(tb, n, (uintptr_t)(tb->tc_ptr + tb->tb_next_offset[n]));
+ uintptr_t addr = (uintptr_t)(tb->tc_ptr + tb->jmp_reset_offset[n]);
+ tb_set_jmp_target(tb, n, addr);
}
/* invalidate one TB */
@@ -1003,19 +1004,21 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
tb_jmp_remove(tb, 1);
/* suppress any remaining jumps to this TB */
- tb1 = tb->jmp_first;
+ tb1 = tb->jmp_list_first;
for (;;) {
n1 = (uintptr_t)tb1 & 3;
if (n1 == 2) {
break;
}
tb1 = (TranslationBlock *)((uintptr_t)tb1 & ~3);
- tb2 = tb1->jmp_next[n1];
+ tb2 = tb1->jmp_list_next[n1];
tb_reset_jump(tb1, n1);
- tb1->jmp_next[n1] = NULL;
+ tb1->jmp_list_next[n1] = NULL;
tb1 = tb2;
}
- tb->jmp_first = (TranslationBlock *)((uintptr_t)tb | 2); /* fail safe */
+
+ /* fail safe */
+ tb->jmp_list_first = (TranslationBlock *)((uintptr_t)tb | 2);
tcg_ctx.tb_ctx.tb_phys_invalidate_count++;
}
@@ -1100,15 +1103,15 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
trace_translate_block(tb, tb->pc, tb->tc_ptr);
/* generate machine code */
- tb->tb_next_offset[0] = 0xffff;
- tb->tb_next_offset[1] = 0xffff;
- tcg_ctx.tb_next_offset = tb->tb_next_offset;
+ tb->jmp_reset_offset[0] = TB_JMP_RESET_OFFSET_INVALID;
+ tb->jmp_reset_offset[1] = TB_JMP_RESET_OFFSET_INVALID;
+ tcg_ctx.tb_jmp_reset_offset = tb->jmp_reset_offset;
#ifdef USE_DIRECT_JUMP
- tcg_ctx.tb_jmp_offset = tb->tb_jmp_offset;
- tcg_ctx.tb_next = NULL;
+ tcg_ctx.tb_jmp_insn_offset = tb->jmp_insn_offset;
+ tcg_ctx.tb_jmp_target_addr = NULL;
#else
- tcg_ctx.tb_jmp_offset = NULL;
- tcg_ctx.tb_next = tb->tb_next;
+ tcg_ctx.tb_jmp_insn_offset = NULL;
+ tcg_ctx.tb_jmp_target_addr = tb->jmp_target_addr;
#endif
#ifdef CONFIG_PROFILER
@@ -1489,15 +1492,15 @@ static void tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
tb->page_addr[1] = -1;
}
- tb->jmp_first = (TranslationBlock *)((uintptr_t)tb | 2);
- tb->jmp_next[0] = NULL;
- tb->jmp_next[1] = NULL;
+ tb->jmp_list_first = (TranslationBlock *)((uintptr_t)tb | 2);
+ tb->jmp_list_next[0] = NULL;
+ tb->jmp_list_next[1] = NULL;
/* init original jump addresses */
- if (tb->tb_next_offset[0] != 0xffff) {
+ if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 0);
}
- if (tb->tb_next_offset[1] != 0xffff) {
+ if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 1);
}
@@ -1690,9 +1693,9 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf)
if (tb->page_addr[1] != -1) {
cross_page++;
}
- if (tb->tb_next_offset[0] != 0xffff) {
+ if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
direct_jmp_count++;
- if (tb->tb_next_offset[1] != 0xffff) {
+ if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
direct_jmp2_count++;
}
}