Re: [Qemu-devel] [PATCH 5/7] trace: Add event "guest_bbl_after"

["Lluís Vilanova" <vilanova@ac.upc.edu>]

Richard Henderson writes:

> On 09/10/2017 09:31 AM, Lluís Vilanova wrote:
>> +void translator__gen_goto_tb(TCGContext *ctx)
>> +{
>> +    if (ctx->disas.in_guest_code &&
>> +        (TRACE_GUEST_BBL_AFTER_ENABLED)) {
>> +        if (ctx->disas.inline_label == NULL) {
>> +            ctx->disas.inline_label = gen_new_inline_label();
>> +        }
>> +        gen_set_inline_point(ctx->disas.inline_label);
>> +        /* disable next exit_tb */
>> +        ctx->disas.seen_goto_tb = true;
>> +    }
>> +}
>> +
>> +void translator__gen_exit_tb(TCGContext *ctx)
>> +{
>> +    if (ctx->disas.in_guest_code && !ctx->disas.seen_goto_tb &&
>> +        (TRACE_GUEST_BBL_AFTER_ENABLED)) {
>> +        if (ctx->disas.inline_label == NULL) {
>> +            ctx->disas.inline_label = gen_new_inline_label();
>> +        }
>> +        gen_set_inline_point(ctx->disas.inline_label);
>> +        /* enable next exit_tb */
>> +        ctx->disas.seen_goto_tb = false;
>> +    }
>> +}

> I don't understand why you wouldn't just modify tcg_gen_goto_tb and
> tcg_gen_exit_tb instead.

I prefer to keep all generic translation-related tracing on a single file, where
it is easier to reason about.

Cheers,
  Lluis