[llvm] r360886 - [DominatorTree] Print roots unconditionally in `print()`.
Clement Courbet via llvm-commits
llvm-commits at lists.llvm.org
Thu May 16 05:48:56 PDT 2019
Author: courbet
Date: Thu May 16 05:48:56 2019
New Revision: 360886
URL: http://llvm.org/viewvc/llvm-project?rev=360886&view=rev
Log:
[DominatorTree] Print roots unconditionally in `print()`.
Summary:
This came up in a debugging session. I was failing to update the root of
the tree, and got during verification:
```
DominatorTree is different than a freshly computed one!
Current:
=============================--------------------------------
Inorder Dominator Tree: DFSNumbers invalid: 0 slow queries.
[1] %"entry+land.rhs.i" {4294967295,4294967295} [0]
[2] %opeq1.exit {4294967295,4294967295} [1]
Freshly computed tree:
=============================--------------------------------
Inorder Dominator Tree: DFSNumbers invalid: 0 slow queries.
[1] %"entry+land.rhs.i" {4294967295,4294967295} [0]
[2] %opeq1.exit {4294967295,4294967295} [1]
```
We now print:
```
DominatorTree is different than a freshly computed one!
Current:
=============================--------------------------------
Inorder Dominator Tree: DFSNumbers invalid: 0 slow queries.
[1] %"entry+land.rhs.i" {4294967295,4294967295} [0]
[2] %opeq1.exit {4294967295,4294967295} [1]
Roots: <badref>
Freshly computed tree:
=============================--------------------------------
Inorder Dominator Tree: DFSNumbers invalid: 0 slow queries.
[1] %"entry+land.rhs.i" {4294967295,4294967295} [0]
[2] %opeq1.exit {4294967295,4294967295} [1]
Roots: %"entry+land.rhs.i"
```
Reviewers: kuhar, asbirlea
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D61999
Modified:
llvm/trunk/include/llvm/Support/GenericDomTree.h
Modified: llvm/trunk/include/llvm/Support/GenericDomTree.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/GenericDomTree.h?rev=360886&r1=360885&r2=360886&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/GenericDomTree.h (original)
+++ llvm/trunk/include/llvm/Support/GenericDomTree.h Thu May 16 05:48:56 2019
@@ -669,14 +669,12 @@ protected:
// The postdom tree can have a null root if there are no returns.
if (getRootNode()) PrintDomTree<NodeT>(getRootNode(), O, 1);
- if (IsPostDominator) {
- O << "Roots: ";
- for (const NodePtr Block : Roots) {
- Block->printAsOperand(O, false);
- O << " ";
- }
- O << "\n";
+ O << "Roots: ";
+ for (const NodePtr Block : Roots) {
+ Block->printAsOperand(O, false);
+ O << " ";
}
+ O << "\n";
}
public:
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