On Thu, Mar 31, 2016 at 5:23 AM, Laurent Bartholdi
<laurent.bartho...@gmail.com> wrote:
> Thanks for the quick reply! Yes, that would be wonderful.
>
> I want to interface to a library that has its own garbage collection; that
> library walks the stack to find potential objects that must be kept alive.
> Therefore, all calls to that library must be done in the form
> library_global_StackBottomBags = __builtin_frame_address(0);
> library_function(...)
OK, this is a reasonable use case if the library requires this....
It's a weird API though.
You can use llvm intrinsics to do that. This is basically how
`__builtin_frame_address` is implemented in clang.
julia> function f()
Base.llvmcall(("""
declare i8 *@llvm.frameaddress(i32)
""", """
%1 = call i8 *@llvm.frameaddress(i32 0)
ret i8 *%1
"""), Ptr{UInt8}, Tuple{})
end
f (generic function with 1 method)
julia> f()
Ptr{UInt8} @0x00007ffecb9a3130
>
>
> On Thursday, 31 March 2016 00:25:13 UTC+2, Yichao Yu wrote:
>>
>>
>> On Mar 30, 2016 6:22 PM, "Yichao Yu" <yyc...@gmail.com> wrote:
>> >
>> >
>> > On Mar 30, 2016 6:21 PM, "Laurent Bartholdi" <laurent....@gmail.com>
>> > wrote:
>> > >
>> > > Hi,
>> > > Is there a way to obtain the address of the current stack frame (the
>> > > ebp register on x86 processors)?
>> > >
>> > > In GCC, there's the bultin primitive __builtin_frame_address() that
>> > > does precisely that.
>> >
>> > Why do you want this?
>> >
>>
>> It's possible but should not be done in general.
>>
>> > >
>> > > Many thanks in advance, Laurent
