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tcg: Reference count labels

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Increment when adding branches, and decrement when removing them.

Backports commit d88a117eaa39b1d0eb1a79fe84c81840a39eb233 from qemu
This commit is contained in:
Richard Henderson 2019-01-05 06:39:04 -05:00 committed by Lioncash
parent 80b4bef1cc
commit 26ab4d6560
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
4 changed files with 25 additions and 1 deletions
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2
qemu/tcg/tcg-op.c
View file

@ -240,6 +240,7 @@ void tcg_gen_brcond_i32(TCGContext *s, TCGCond cond, TCGv_i32 arg1, TCGv_i32 arg
if (cond == TCG_COND_ALWAYS) {
tcg_gen_br(s, l);
} else if (cond != TCG_COND_NEVER) {
l->refs++;
tcg_gen_op4ii_i32(s, INDEX_op_brcond_i32, arg1, arg2, cond, label_arg(s, l));
}
}
@ -1412,6 +1413,7 @@ void tcg_gen_brcond_i64(TCGContext *s, TCGCond cond, TCGv_i64 arg1, TCGv_i64 arg
if (cond == TCG_COND_ALWAYS) {
tcg_gen_br(s, l);
} else if (cond != TCG_COND_NEVER) {
l->refs++;
if (TCG_TARGET_REG_BITS == 32) {
tcg_gen_op6ii_i32(s, INDEX_op_brcond2_i32, TCGV_LOW(s, arg1),
TCGV_HIGH(s, arg1), TCGV_LOW(s, arg2),

1
qemu/tcg/tcg-op.h
View file

@ -273,6 +273,7 @@ static inline void gen_set_label(TCGContext *s, TCGLabel *l)
static inline void tcg_gen_br(TCGContext *s, TCGLabel *l)
{
l->refs++;
tcg_gen_op1(s, INDEX_op_br, label_arg(s, l));
}

20
qemu/tcg/tcg.c
View file

@ -1678,6 +1678,26 @@ static void process_op_defs(TCGContext *s)
void tcg_op_remove(TCGContext *s, TCGOp *op)
{
TCGLabel *label;
switch (op->opc) {
case INDEX_op_br:
label = arg_label(s, op->args[0]);
label->refs--;
break;
case INDEX_op_brcond_i32:
case INDEX_op_brcond_i64:
label = arg_label(s, op->args[3]);
label->refs--;
break;
case INDEX_op_brcond2_i32:
label = arg_label(s, op->args[5]);
label->refs--;
break;
default:
break;
}
QTAILQ_REMOVE(&s->ops, op, link);
QTAILQ_INSERT_TAIL(&s->free_ops, op, link);
s->nb_ops--;

3
qemu/tcg/tcg.h
View file

@ -250,7 +250,8 @@ typedef struct TCGRelocation {
typedef struct TCGLabel {
unsigned has_value : 1;
unsigned id : 31;
unsigned id : 15;
unsigned refs : 16;
union {
uintptr_t value;
tcg_insn_unit *value_ptr;