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tcg: Remove tcg_check_temp_count, tcg_clear_temp_count

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Since all temps allocated by guest front-ends are now TEMP_TB,
and we don't recycle TEMP_TB, there's no point in requiring
that the front-ends free the temps at all.  Begin by dropping
the inner-most checks that all temps have been freed.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-02-24 16:15:18 -10:00
parent 3470867b3b
commit 2f2e911d0c
3 changed files with 8 additions and 72 deletions
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12
accel/tcg/translator.c
View file

@ -18,17 +18,8 @@
#include "exec/plugin-gen.h"
#include "exec/replay-core.h"
/* Pairs with tcg_clear_temp_count.
To be called by #TranslatorOps.{translate_insn,tb_stop} if
(1) the target is sufficiently clean to support reporting,
(2) as and when all temporaries are known to be consumed.
For most targets, (2) is at the end of translate_insn. */
void translator_loop_temp_check(DisasContextBase *db)
{
if (tcg_check_temp_count()) {
qemu_log("warning: TCG temporary leaks before "
TARGET_FMT_lx "\n", db->pc_next);
}
}
bool translator_use_goto_tb(DisasContextBase *db, target_ulong dest)
@ -67,9 +58,6 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
ops->init_disas_context(db, cpu);
tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
/* Reset the temp count so that we can identify leaks */
tcg_clear_temp_count();
/* Start translating. */
gen_tb_start(db->tb);
ops->tb_start(db, cpu);

14
include/tcg/tcg.h
View file

@ -574,7 +574,6 @@ struct TCGContext {
#endif
#ifdef CONFIG_DEBUG_TCG
int temps_in_use;
int goto_tb_issue_mask;
const TCGOpcode *vecop_list;
#endif
@ -965,19 +964,6 @@ static inline TCGv_ptr tcg_temp_new_ptr(void)
return temp_tcgv_ptr(t);
}
#if defined(CONFIG_DEBUG_TCG)
/* If you call tcg_clear_temp_count() at the start of a section of
* code which is not supposed to leak any TCG temporaries, then
* calling tcg_check_temp_count() at the end of the section will
* return 1 if the section did in fact leak a temporary.
*/
void tcg_clear_temp_count(void);
int tcg_check_temp_count(void);
#else
#define tcg_clear_temp_count() do { } while (0)
#define tcg_check_temp_count() 0
#endif
int64_t tcg_cpu_exec_time(void);
void tcg_dump_info(GString *buf);
void tcg_dump_op_count(GString *buf);

54
tcg/tcg.c
View file

@ -1273,7 +1273,7 @@ TCGTemp *tcg_temp_new_internal(TCGType type, TCGTempKind kind)
ts->temp_allocated = 1;
tcg_debug_assert(ts->base_type == type);
tcg_debug_assert(ts->kind == kind);
goto done;
return ts;
}
} else {
tcg_debug_assert(kind == TEMP_TB);
@ -1317,11 +1317,6 @@ TCGTemp *tcg_temp_new_internal(TCGType type, TCGTempKind kind)
ts2->kind = kind;
}
}
done:
#if defined(CONFIG_DEBUG_TCG)
s->temps_in_use++;
#endif
return ts;
}
@ -1366,30 +1361,18 @@ void tcg_temp_free_internal(TCGTemp *ts)
switch (ts->kind) {
case TEMP_CONST:
/*
* In order to simplify users of tcg_constant_*,
* silently ignore free.
*/
return;
case TEMP_EBB:
case TEMP_TB:
/* Silently ignore free. */
break;
case TEMP_EBB:
tcg_debug_assert(ts->temp_allocated != 0);
ts->temp_allocated = 0;
set_bit(temp_idx(ts), s->free_temps[ts->base_type].l);
break;
default:
/* It never made sense to free TEMP_FIXED or TEMP_GLOBAL. */
g_assert_not_reached();
}
tcg_debug_assert(ts->temp_allocated != 0);
ts->temp_allocated = 0;
#if defined(CONFIG_DEBUG_TCG)
assert(s->temps_in_use > 0);
s->temps_in_use--;
#endif
if (ts->kind == TEMP_EBB) {
int idx = temp_idx(ts);
set_bit(idx, s->free_temps[ts->base_type].l);
}
}
TCGTemp *tcg_constant_internal(TCGType type, int64_t val)
@ -1477,27 +1460,6 @@ TCGv_i64 tcg_const_i64(int64_t val)
return t0;
}
#if defined(CONFIG_DEBUG_TCG)
void tcg_clear_temp_count(void)
{
TCGContext *s = tcg_ctx;
s->temps_in_use = 0;
}
int tcg_check_temp_count(void)
{
TCGContext *s = tcg_ctx;
if (s->temps_in_use) {
/* Clear the count so that we don't give another
* warning immediately next time around.
*/
s->temps_in_use = 0;
return 1;
}
return 0;
}
#endif
/* Return true if OP may appear in the opcode stream.
Test the runtime variable that controls each opcode. */
bool tcg_op_supported(TCGOpcode op)