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Viewing changes to include/exec/gen-icount.h

  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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Lines of Context:
include/exec/gen-icount.h
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/* Helpers for instruction counting code generation.  */
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static int icount_start_insn_idx;
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static TCGLabel *icount_label;
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static TCGLabel *exitreq_label;
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static inline void gen_tb_start(TranslationBlock *tb)
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{
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    TCGv_i32 count, flag, imm;
 
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    TCGv_i32 count, imm;
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    exitreq_label = gen_new_label();
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    flag = tcg_temp_new_i32();
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    tcg_gen_ld_i32(flag, cpu_env,
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                   offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
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    tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);
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    tcg_temp_free_i32(flag);
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    if (!(tb->cflags & CF_USE_ICOUNT)) {
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        return;
 
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    if (tb->cflags & CF_USE_ICOUNT) {
 
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        count = tcg_temp_local_new_i32();
 
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    } else {
 
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        count = tcg_temp_new_i32();
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    }
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    icount_label = gen_new_label();
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    count = tcg_temp_local_new_i32();
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    tcg_gen_ld_i32(count, cpu_env,
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                   -ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
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    imm = tcg_temp_new_i32();
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    /* We emit a movi with a dummy immediate argument. Keep the insn index
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     * of the movi so that we later (when we know the actual insn count)
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     * can update the immediate argument with the actual insn count.  */
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    icount_start_insn_idx = tcg_op_buf_count();
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    tcg_gen_movi_i32(imm, 0xdeadbeef);
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    tcg_gen_sub_i32(count, count, imm);
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    tcg_temp_free_i32(imm);
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    tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
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    tcg_gen_st16_i32(count, cpu_env,
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                     -ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
 
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    if (tb->cflags & CF_USE_ICOUNT) {
 
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        imm = tcg_temp_new_i32();
 
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        /* We emit a movi with a dummy immediate argument. Keep the insn index
 
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         * of the movi so that we later (when we know the actual insn count)
 
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         * can update the immediate argument with the actual insn count.  */
 
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        icount_start_insn_idx = tcg_op_buf_count();
 
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        tcg_gen_movi_i32(imm, 0xdeadbeef);
 
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        tcg_gen_sub_i32(count, count, imm);
 
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        tcg_temp_free_i32(imm);
 
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    }
 
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    tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, exitreq_label);
 
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    if (tb->cflags & CF_USE_ICOUNT) {
 
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        tcg_gen_st16_i32(count, cpu_env,
 
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                         -ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
 
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    }
 
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    tcg_temp_free_i32(count);
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}
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static void gen_tb_end(TranslationBlock *tb, int num_insns)
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{
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    gen_set_label(exitreq_label);
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    tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
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    if (tb->cflags & CF_USE_ICOUNT) {
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        /* Update the num_insn immediate parameter now that we know
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         * the actual insn count.  */
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        tcg_set_insn_param(icount_start_insn_idx, 1, num_insns);
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        gen_set_label(icount_label);
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        tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
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    }
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    gen_set_label(exitreq_label);
 
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    tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
 
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    /* Terminate the linked list.  */
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    tcg_ctx.gen_op_buf[tcg_ctx.gen_op_buf[0].prev].next = 0;
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}