Re: Using helper return into native code

You need to call emit_pushresult_Ptr after the first helper call to get =
the return value pushed onto the stack:

<emit the first helper call with a "normal" emit macro, without problem>
emit_pushresult_Ptr();
enregisterTOS;
mov_register_indirect_to(ARG_1, TOS_REG_1);
callInfo.reset();
emit_callhelper_D(func);

-Jan

-----Original Message-----
From: Discussion of the Rotor Shared Source CLI implementation =
[mailto:[email protected]] On Behalf Of J. Redondo
Sent: Monday, March 21, 2005 1:43 AM
To: [email protected]
Subject: [DOTNET-ROTOR] Using helper return into native code

Hello,

In my quest to explore and study the FJit a bit more, I'm having trouble
accessing to certain data that I need to fully implement my own Rotor
project. The problem is that, once I managed to insert calls to jit
interface helpers in the places I wanted, thanks to your valuable help,
there is a special case in which I'm not having too much success. The
problem is that when a helper call is performed, I need its return value =
to
pass it as a parameter to another helper call which follows the first
(performed with another emit_callhelper_X macro or similar). The first
helper returns an int value and the second helper only admits an int
parameter, although I pretend to add some extra parameters once I solve =
this
issue. So, the steps I follow are:

<emit the first helper call with a "normal" emit macro, without problem>
enregisterTOS;
mov_register_indirect_to(ARG_1, TOS_REG_1);
callInfo.reset();
emit_callhelper_D(func);

As far as I know, when a function returns, it's return value is placed =
in
the stack, so I basically try to place the top of the stack into a =
register
(enregisterTOS place the value into the TOS_REG_1 register), move the =
value
to be the first argument of my second call, and perform the call. =
However,
an error related to the method table of the current object is shown, =
because
I think that the value I move is the pointer to the 'this' object. If =
that
it's true, that means that the return value of the first helper is not =
in
the top of the stack, but then I'm completely clueless about where is it
placed. =BFAnybody can give me a clue about this problem?

Thank you very much in advance,

J. Redondo

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