[llvm-commits] [llvm] r74668 - /llvm/trunk/docs/WritingAnLLVMPass.html

[Devang Patel]

Thanks!
-
Devang

On Wed, Jul 1, 2009 at 4:38 PM, Daniel Dunbar<daniel at zuster.org> wrote:
> Author: ddunbar
> Date: Wed Jul  1 18:38:44 2009
> New Revision: 74668
>
> URL: http://llvm.org/viewvc/llvm-project?rev=74668&view=rev
> Log:
> Try to clarify a point about getting DominatorTree info from a module pass.
>
> Modified:
>    llvm/trunk/docs/WritingAnLLVMPass.html
>
> Modified: llvm/trunk/docs/WritingAnLLVMPass.html
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/WritingAnLLVMPass.html?rev=74668&r1=74667&r2=74668&view=diff
>
> ==============================================================================
> --- llvm/trunk/docs/WritingAnLLVMPass.html (original)
> +++ llvm/trunk/docs/WritingAnLLVMPass.html Wed Jul  1 18:38:44 2009
> @@ -491,10 +491,15 @@
>  <tt>ModulePass</tt> indicates that your pass uses the entire program as a unit,
>  refering to function bodies in no predictable order, or adding and removing
>  functions.  Because nothing is known about the behavior of <tt>ModulePass</tt>
> -subclasses, no optimization can be done for their execution. A module pass
> -can use function level passes (e.g. dominators) using getAnalysis interface
> -<tt> getAnalysis<DominatorTree>(Function)</tt>, if the function pass
> -does not require any module passes. </p>
> +subclasses, no optimization can be done for their execution.</p>
> +
> +<p>A module pass can use function level passes (e.g. dominators) using
> +the getAnalysis interface
> +<tt>getAnalysis<DominatorTree>(llvm::Function *)</tt> to provide the
> +function to retrieve analysis result for, if the function pass does not require
> +any module passes. Note that this can only be done for functions for which the
> +analysis ran, e.g. in the case of dominators you should only ask for the
> +DominatorTree for function definitions, not declarations.</p>
>
>  <p>To write a correct <tt>ModulePass</tt> subclass, derive from
>  <tt>ModulePass</tt> and overload the <tt>runOnModule</tt> method with the
>
>
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-- 
-
Devang