llvm dev - May 2010 - [LLVMdev] does llvm have some way to get the size of data type

Hi:

just like the c function sizeof(). I would avoid the usage of the c
function call, and expect something like llvm
intrinsic or some class providing this functionality.

Does someone have experience in this?
Thanks
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Try
http://llvm.org/doxygen/classllvm_1_1ConstantExpr.html#a2ea738dfa37ea93c71756be89ba8d92
or
http://llvm.org/doxygen/classllvm_1_1TargetData.html#64c154a7844026e76e18f792ee4ad4b3

On Fri, May 7, 2010 at 8:26 PM, Gang.Yao <ttoole9 at gmail.com>
wrote:
> Hi:
>
> just like the c function sizeof(). I would avoid the usage of the c
> function call, and expect something like llvm
> intrinsic or some class providing this functionality.
>
> Does someone have experience in this?
> Thanks
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>

Hello! You can do this:

http://nondot.org/sabre/LLVMNotes/SizeOf-OffsetOf-VariableSizedStructs.txt

On Fri, May 7, 2010 at 8:26 PM, Gang.Yao <ttoole9 at gmail.com> wrote:
> Hi:
>
> just like the c function sizeof(). I would avoid the usage of the c
> function call, and expect something like llvm
> intrinsic or some class providing this functionality.
>
> Does someone have experience in this?
> Thanks
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
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Look at the getABITypeSize() method (or some method with a name like that) of
the TargetData class.

Note that TargetData is an LLVM analysis pass; you have to declare it as a
prerequisite pass in your pass's getAnalysisUsage() method.

-- John T.

________________________________________
From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] On Behalf
Of Gang.Yao [ttoole9 at gmail.com]
Sent: Friday, May 07, 2010 10:26 PM
To: llvmdev at cs.uiuc.edu
Subject: [LLVMdev] does llvm have some way to get the size of data type

Hi:

just like the c function sizeof(). I would avoid the usage of the c
function call, and expect something like llvm
intrinsic or some class providing this functionality.

Does someone have experience in this?
Thanks

mike-m, is there any way to configure doxygen to produce
human-readable anchors? They might have avoided the duplication on
this thread, since Erick and John could have seen that I was linking
to their suggestions.

On Fri, May 7, 2010 at 8:47 PM, Jeffrey Yasskin <jyasskin at google.com>
wrote:
> Try
http://llvm.org/doxygen/classllvm_1_1ConstantExpr.html#a2ea738dfa37ea93c71756be89ba8d92
> or
http://llvm.org/doxygen/classllvm_1_1TargetData.html#64c154a7844026e76e18f792ee4ad4b3
>
> On Fri, May 7, 2010 at 8:26 PM, Gang.Yao <ttoole9 at gmail.com>
wrote:
>> Hi:
>>
>> just like the c function sizeof(). I would avoid the usage of the c
>> function call, and expect something like llvm
>> intrinsic or some class providing this functionality.
>>
>> Does someone have experience in this?
>> Thanks
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>>
>

On May 8, 2010, at 2:20 AM, Erick Tryzelaar wrote:
> Hello! You can do this:
> 
> http://nondot.org/sabre/LLVMNotes/SizeOf-OffsetOf-VariableSizedStructs.txt
Also, the ConstantExpr class has getSizeOf, getOffsetOf, and
getAlignOf utility functions which make this easy.

Dan