Ok, third time's the charm. No changes from last time except the CMake
source addition. Apparently the buildbots were wrong about failures.
---
Add some switches helpful for debugging:
-print-before=<Pass Name>
Dump IR before running pass <Pass Name>.
-print-before-all
Dump IR before running each pass.
-print-after-all
Dump IR after running each pass.
These are helpful when tracking down a miscompilation. It is easy to
get IR dumps and do diffs on them, etc.
To make this work well, add a new getPrinterPass API to Pass so that
each kind of pass (ModulePass, FunctionPass, etc.) can create a Pass
suitable for dumping out the kind of object the Pass works on.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100249 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/LoopPass.cpp b/lib/Analysis/LoopPass.cpp
index e2d2c2b..2727d2f 100644
--- a/lib/Analysis/LoopPass.cpp
+++ b/lib/Analysis/LoopPass.cpp
@@ -14,9 +14,44 @@
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Assembly/PrintModulePass.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Support/Timer.h"
using namespace llvm;
+namespace {
+
+/// PrintLoopPass - Print a Function corresponding to a Loop.
+///
+class PrintLoopPass : public LoopPass {
+private:
+ std::string Banner;
+ raw_ostream &Out; // raw_ostream to print on.
+
+public:
+ static char ID;
+ PrintLoopPass() : LoopPass(&ID), Out(dbgs()) {}
+ PrintLoopPass(const std::string &B, raw_ostream &o)
+ : LoopPass(&ID), Banner(B), Out(o) {}
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ }
+
+ bool runOnLoop(Loop *L, LPPassManager &) {
+ Out << Banner;
+ for (Loop::block_iterator b = L->block_begin(), be = L->block_end();
+ b != be;
+ ++b) {
+ (*b)->print(Out);
+ }
+ return false;
+ }
+};
+
+char PrintLoopPass::ID = 0;
+}
+
//===----------------------------------------------------------------------===//
// LPPassManager
//
@@ -306,6 +341,11 @@
//===----------------------------------------------------------------------===//
// LoopPass
+Pass *LoopPass::createPrinterPass(raw_ostream &O,
+ const std::string &Banner) const {
+ return new PrintLoopPass(Banner, O);
+}
+
// Check if this pass is suitable for the current LPPassManager, if
// available. This pass P is not suitable for a LPPassManager if P
// is not preserving higher level analysis info used by other