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tcg: Dynamically allocate TCGOps

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With no fixed array allocation, we can't overflow a buffer.
This will be important as optimizations related to host vectors
may expand the number of ops used.

Use QTAILQ to link the ops together.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2017-11-02 15:19:14 +01:00
parent f764718d0c
commit 15fa08f845
12 changed files with 78 additions and 158 deletions
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9
include/exec/gen-icount.h
View file

@ -5,7 +5,7 @@
/* Helpers for instruction counting code generation. */
static int icount_start_insn_idx;
static TCGOp *icount_start_insn;
static inline void gen_tb_start(TranslationBlock *tb)
{
@ -26,8 +26,8 @@ static inline void gen_tb_start(TranslationBlock *tb)
/* We emit a movi with a dummy immediate argument. Keep the insn index
* of the movi so that we later (when we know the actual insn count)
* can update the immediate argument with the actual insn count. */
icount_start_insn_idx = tcg_op_buf_count();
tcg_gen_movi_i32(imm, 0xdeadbeef);
icount_start_insn = tcg_last_op();
tcg_gen_sub_i32(count, count, imm);
tcg_temp_free_i32(imm);
@ -48,14 +48,11 @@ static inline void gen_tb_end(TranslationBlock *tb, int num_insns)
if (tb_cflags(tb) & CF_USE_ICOUNT) {
/* Update the num_insn immediate parameter now that we know
* the actual insn count. */
tcg_set_insn_param(icount_start_insn_idx, 1, num_insns);
tcg_set_insn_param(icount_start_insn, 1, num_insns);
}
gen_set_label(tcg_ctx->exitreq_label);
tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
/* Terminate the linked list. */
tcg_ctx->gen_op_buf[tcg_ctx->gen_op_buf[0].prev].next = 0;
}
static inline void gen_io_start(void)

5
include/qemu/queue.h
View file

@ -425,6 +425,11 @@ struct { \
(var); \
(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))
#define QTAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, prev_var) \
for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \
(var) && ((prev_var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)), 1); \
(var) = (prev_var))
/*
* Tail queue access methods.
*/