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Try to clarify a point about getting DominatorTree info from a module pass.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74668 91177308-0d34-0410-b5e6-96231b3b80d8
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Daniel Dunbar 2009-07-01 23:38:44 +00:00
parent 7074feab96
commit b71725b468
1 changed files with 9 additions and 4 deletions
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docs/WritingAnLLVMPass.html
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@ -491,10 +491,15 @@ class is the most general of all superclasses that you can use. Deriving from
<tt>ModulePass</tt> indicates that your pass uses the entire program as a unit, <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 refering to function bodies in no predictable order, or adding and removing
functions. Because nothing is known about the behavior of <tt>ModulePass</tt> functions. Because nothing is known about the behavior of <tt>ModulePass</tt>
subclasses, no optimization can be done for their execution. A module pass subclasses, no optimization can be done for their execution.</p>
can use function level passes (e.g. dominators) using getAnalysis interface
<tt> getAnalysis&lt;DominatorTree&gt;(Function)</tt>, if the function pass <p>A module pass can use function level passes (e.g. dominators) using
does not require any module passes. </p> the getAnalysis interface
<tt>getAnalysis&lt;DominatorTree&gt;(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 <p>To write a correct <tt>ModulePass</tt> subclass, derive from
<tt>ModulePass</tt> and overload the <tt>runOnModule</tt> method with the <tt>ModulePass</tt> and overload the <tt>runOnModule</tt> method with the