llvm dev - Sep 2010 - [LLVMdev] [LLVMDev] [Modeling] About the structure of my allocator

On Sep 2, 2010, at 2:44 PMPDT, Jeff Kunkel wrote:
> I need to track which MachineBasicBlocks branch into other  
> MachineBasicBlocks. How do I do it?
Look at the Predecessor/Successor lists, which are target-independent
> I see a MachineOperand can hold a MachineBasicBlock*. Does this mean  
> the instruction may branch to the MachineBasicBlock, or can it be  
> something like an object reference?
It can also be the dreaded gcc "address of label" extension.  Number  
and ordering of instruction operands is target-dependent.

Is there any way to tell where in the Instruction list, the branch to the
other MachineBasicBlock happens? I know in the BasicBlock had a nice api for
it.

Thanks,
Jeff Kunkel

On Thu, Sep 2, 2010 at 5:56 PM, Dale Johannesen <dalej at apple.com>
wrote:
>
> On Sep 2, 2010, at 2:44 PMPDT, Jeff Kunkel wrote:
>
>> I need to track which MachineBasicBlocks branch into other
>> MachineBasicBlocks. How do I do it?
>>
>
> Look at the Predecessor/Successor lists, which are target-independent
>
>
>  I see a MachineOperand can hold a MachineBasicBlock*. Does this mean the
>> instruction may branch to the MachineBasicBlock, or can it be something
like
>> an object reference?
>>
>
> It can also be the dreaded gcc "address of label" extension. 
Number and
> ordering of instruction operands is target-dependent.
>
>
>
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It is at the end allowing for oddities like debug info and multiple  
branches.  You might want to look at AnalyzeBranch.

On Sep 2, 2010, at 4:19 PMPDT, Jeff Kunkel wrote:
> Is there any way to tell where in the Instruction list, the branch  
> to the other MachineBasicBlock happens? I know in the BasicBlock had  
> a nice api for it.
>
> Thanks,
> Jeff Kunkel
>
> On Thu, Sep 2, 2010 at 5:56 PM, Dale Johannesen <dalej at apple.com>
> wrote:
>
> On Sep 2, 2010, at 2:44 PMPDT, Jeff Kunkel wrote:
> I need to track which MachineBasicBlocks branch into other  
> MachineBasicBlocks. How do I do it?
>
> Look at the Predecessor/Successor lists, which are target-independent
>
>
> I see a MachineOperand can hold a MachineBasicBlock*. Does this mean  
> the instruction may branch to the MachineBasicBlock, or can it be  
> something like an object reference?
>
> It can also be the dreaded gcc "address of label" extension. 
Number
> and ordering of instruction operands is target-dependent.
>
>
>
> _______________________________________________
> 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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