[LLVMdev] Documentation of malloc/free

[Chris Lattner]

On Dec 7, 2009, at 9:49 AM, Garrison Venn wrote:

> So I gather this means that malloc was removed from the IR because  
> there are platforms that don't have non-stack allocation semantics?

No, it was removed because it wasn't necessary, and the malloc  
'instruction' didn't support 64-bit targets.

-Chris

>
> Garrison
>
> On Dec 7, 2009, at 12:21, Chris Lattner wrote:
>
>>
>> On Dec 7, 2009, at 8:45 AM, Garrison Venn wrote:
>>
>>> Ouch! Didn't see that. So at the risk of irritating those still in  
>>> the process of baking 2.7, what is the sanction way of doing heap  
>>> allocation going forward? :-)
>>
>> No, we only support stack allocation in LLVM IR now. :-)
>>
>> You can call out to normal malloc and free, just like any external  
>> function.
>>
>> -Chris
>>
>>>
>>> Garrison
>>>
>>> On Dec 7, 2009, at 11:18, Chris Lattner wrote:
>>>
>>>>
>>>> On Dec 7, 2009, at 2:13 AM, Florian Merz wrote:
>>>>
>>>>> Hi everyone,
>>>>>
>>>>> I noticed that MallocInst and FreeInst have been removed from  
>>>>> the LLVM IR as
>>>>> well as the language reference[1]. May I propose that at least  
>>>>> some
>>>>> placeholder is left in that document telling the reader that these
>>>>> instructions have been removed. This should be kept in at least  
>>>>> until there is
>>>>> one official release that does not support these instructions  
>>>>> anymore.
>>>>> The same goes for the addition of the indirect branch  
>>>>> instruction. A note in
>>>>> the language reference would be nice telling the reader when  
>>>>> this instruction
>>>>> has been added to the language.
>>>>
>>>> Hi Florian,
>>>>
>>>> The documentation for LLVM is intended to describe the state of  
>>>> the system without a historical view.  To get the historical view  
>>>> we put major changes in the release notes.  These haven't been  
>>>> written yet for 2.7 though.
>>>>
>>>> -Chris
>>>>
>>>>
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>>>
>>
>
>
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