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tcg: Add temp_readonly

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In most, but not all, places that we check for TEMP_FIXED,
we are really testing that we do not modify the temporary.

Backports e01fa97dea857a35be5bb8cce0d632a62e72c689
This commit is contained in:
Richard Henderson 2021-03-03 20:45:20 -05:00 committed by Lioncash
parent 30739864d2
commit b49c4639d1
2 changed files with 15 additions and 11 deletions
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21
qemu/tcg/tcg.c
View file

@ -2605,7 +2605,7 @@ static void temp_load(TCGContext *, TCGTemp *, TCGRegSet, TCGRegSet, TCGRegSet);
mark it free; otherwise mark it dead. */
static void temp_free_or_dead(TCGContext *s, TCGTemp *ts, int free_or_dead)
{
if (ts->kind == TEMP_FIXED) {
if (temp_readonly(ts)) {
return;
}
if (ts->val_type == TEMP_VAL_REG) {
@ -2629,7 +2629,7 @@ static inline void temp_dead(TCGContext *s, TCGTemp *ts)
static void temp_sync(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs,
TCGRegSet preferred_regs, int free_or_dead)
{
if (ts->kind == TEMP_FIXED) {
if (temp_readonly(ts)) {
return;
}
if (!ts->mem_coherent) {
@ -2812,8 +2812,7 @@ static void temp_save(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
{
/* The liveness analysis already ensures that globals are back
in memory. Keep an tcg_debug_assert for safety. */
tcg_debug_assert(ts->val_type == TEMP_VAL_MEM
|| ts->kind == TEMP_FIXED);
tcg_debug_assert(ts->val_type == TEMP_VAL_MEM || temp_readonly(ts));
}
/* save globals to their canonical location and assume they can be
@ -2871,7 +2870,7 @@ static void tcg_reg_alloc_do_movi(TCGContext *s, TCGTemp *ots,
TCGRegSet preferred_regs)
{
/* ENV should not be modified. */
tcg_debug_assert(ots->kind != TEMP_FIXED);
tcg_debug_assert(!temp_readonly(ots));
/* The movi is not explicitly generated here. */
if (ots->val_type == TEMP_VAL_REG) {
@ -2911,7 +2910,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
ts = arg_temp(op->args[1]);
/* ENV should not be modified. */
tcg_debug_assert(ots->kind != TEMP_FIXED);
tcg_debug_assert(!temp_readonly(ots));
/* Note that otype != itype for no-op truncation. */
otype = ots->type;
@ -2972,7 +2971,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
* Store the source register into the destination slot
* and leave the destination temp as TEMP_VAL_MEM.
*/
assert(ots->kind != TEMP_FIXED);
assert(!temp_readonly(ots));
if (!ts->mem_allocated) {
temp_allocate_frame(s, ots);
}
@ -3009,7 +3008,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp *op)
its = arg_temp(op->args[1]);
/* ENV should not be modified. */
tcg_debug_assert(ots->kind != TEMP_FIXED);
tcg_debug_assert(!temp_readonly(ots));
itype = its->type;
vece = TCGOP_VECE(op);
@ -3239,7 +3238,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
ts = arg_temp(arg);
/* ENV should not be modified. */
tcg_debug_assert(ts->kind != TEMP_FIXED);
tcg_debug_assert(!temp_readonly(ts));
if (arg_ct->oalias && !const_args[arg_ct->alias_index]) {
reg = new_args[arg_ct->alias_index];
@ -3280,7 +3279,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
ts = arg_temp(op->args[i]);
/* ENV should not be modified. */
tcg_debug_assert(ts->kind != TEMP_FIXED);
tcg_debug_assert(!temp_readonly(ts));
if (NEED_SYNC_ARG(i)) {
temp_sync(s, ts, o_allocated_regs, 0, IS_DEAD_ARG(i));
@ -3412,7 +3411,7 @@ static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
ts = arg_temp(arg);
/* ENV should not be modified. */
tcg_debug_assert(ts->kind != TEMP_FIXED);
tcg_debug_assert(!temp_readonly(ts));
reg = tcg_target_call_oarg_regs[i];
tcg_debug_assert(s->reg_to_temp[reg] == NULL);

5
qemu/tcg/tcg.h
View file

@ -875,6 +875,11 @@ struct TCGContext {
TCGLabel *exitreq_label; // gen_tb_start()
};
static inline bool temp_readonly(TCGTemp *ts)
{
return ts->kind == TEMP_FIXED;
}
static inline size_t temp_idx(TCGContext *tcg_ctx, TCGTemp *ts)
{
ptrdiff_t n = ts - tcg_ctx->temps;