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| author | Daniel Dunbar <daniel@zuster.org> | 2009-07-01 23:38:44 +0000 |
|---|---|---|
| committer | Daniel Dunbar <daniel@zuster.org> | 2009-07-01 23:38:44 +0000 |
| commit | b7750c5325d8bb3260462b21ee46e2dc675c6a3c (patch) | |
| tree | 1de683d68c82171f02aefd6ceee27ba04fab104c /docs/WritingAnLLVMPass.html | |
| parent | 3960163e9cb9e5685f8ae321ed57eb0aec5f4c8b (diff) | |
| download | external_llvm-b7750c5325d8bb3260462b21ee46e2dc675c6a3c.zip external_llvm-b7750c5325d8bb3260462b21ee46e2dc675c6a3c.tar.gz external_llvm-b7750c5325d8bb3260462b21ee46e2dc675c6a3c.tar.bz2 | |
Try to clarify a point about getting DominatorTree info from a module pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74668 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/WritingAnLLVMPass.html')
| -rw-r--r-- | docs/WritingAnLLVMPass.html | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/docs/WritingAnLLVMPass.html b/docs/WritingAnLLVMPass.html index 8374bfa..b8ac9e9 100644 --- a/docs/WritingAnLLVMPass.html +++ b/docs/WritingAnLLVMPass.html @@ -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, 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 |