[Mlir-commits] [mlir] [MLIR] Add a OpWithFlags class that acts as a "stream modifier" to customize Operation streaming (PR #150636)
Mehdi Amini
llvmlistbot at llvm.org
Fri Jul 25 11:36:05 PDT 2025
https://github.com/joker-eph updated https://github.com/llvm/llvm-project/pull/150636
>From ccd1828d25ee9cd3ebdd75fa39ad449d4185607b Mon Sep 17 00:00:00 2001
From: Mehdi Amini <joker.eph at gmail.com>
Date: Fri, 25 Jul 2025 08:08:32 -0700
Subject: [PATCH] [MLIR] Add a OpWithFlags class that acts as a "stream
modifier" to customize Operation streaming
---
mlir/include/mlir/IR/Operation.h | 23 +++++++++++++++++++
.../Analysis/DataFlow/LivenessAnalysis.cpp | 5 ++--
mlir/lib/Transforms/RemoveDeadValues.cpp | 6 ++---
.../Transforms/Utils/DialectConversion.cpp | 6 +++--
4 files changed, 32 insertions(+), 8 deletions(-)
diff --git a/mlir/include/mlir/IR/Operation.h b/mlir/include/mlir/IR/Operation.h
index fa8a4873572ce..edc8ab489e12d 100644
--- a/mlir/include/mlir/IR/Operation.h
+++ b/mlir/include/mlir/IR/Operation.h
@@ -1102,6 +1102,29 @@ inline raw_ostream &operator<<(raw_ostream &os, const Operation &op) {
return os;
}
+/// A wrapper class that allows for printing an operation with a set of flags,
+/// useful to act as a "stream modifier" to customize printing an operation
+/// with a stream using the operator<< overload, e.g.:
+/// llvm::dbgs() << OpWithFlags(op, OpPrintingFlags().skipRegions());
+class OpWithFlags {
+public:
+ OpWithFlags(Operation *op, OpPrintingFlags flags = {})
+ : op(op), theFlags(flags) {}
+ OpPrintingFlags &flags() { return theFlags; }
+ const OpPrintingFlags &flags() const { return theFlags; }
+
+private:
+ Operation *op;
+ OpPrintingFlags theFlags;
+ friend raw_ostream &operator<<(raw_ostream &os, const OpWithFlags &op);
+};
+
+inline raw_ostream &operator<<(raw_ostream &os,
+ const OpWithFlags &opWithFlags) {
+ opWithFlags.op->print(os, opWithFlags.flags());
+ return os;
+}
+
} // namespace mlir
namespace llvm {
diff --git a/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp b/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp
index 94d52215b8f14..e622365bf7bae 100644
--- a/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp
@@ -80,9 +80,8 @@ ChangeResult Liveness::meet(const AbstractSparseLattice &other) {
LogicalResult
LivenessAnalysis::visitOperation(Operation *op, ArrayRef<Liveness *> operands,
ArrayRef<const Liveness *> results) {
- LLVM_DEBUG(DBGS() << "[visitOperation] Enter: ";
- op->print(llvm::dbgs(), OpPrintingFlags().skipRegions());
- llvm::dbgs() << "\n");
+ LDBG() << "[visitOperation] Enter: "
+ << OpWithFlags(op, OpPrintingFlags().skipRegions());
// This marks values of type (1.a) and (4) liveness as "live".
if (!isMemoryEffectFree(op) || op->hasTrait<OpTrait::ReturnLike>()) {
LDBG() << "[visitOperation] Operation has memory effects or is "
diff --git a/mlir/lib/Transforms/RemoveDeadValues.cpp b/mlir/lib/Transforms/RemoveDeadValues.cpp
index cfd7b5b6c22ff..5650de2862545 100644
--- a/mlir/lib/Transforms/RemoveDeadValues.cpp
+++ b/mlir/lib/Transforms/RemoveDeadValues.cpp
@@ -36,6 +36,7 @@
#include "mlir/IR/Builders.h"
#include "mlir/IR/BuiltinAttributes.h"
#include "mlir/IR/Dialect.h"
+#include "mlir/IR/Operation.h"
#include "mlir/IR/OperationSupport.h"
#include "mlir/IR/SymbolTable.h"
#include "mlir/IR/Value.h"
@@ -411,9 +412,8 @@ static void processRegionBranchOp(RegionBranchOpInterface regionBranchOp,
RunLivenessAnalysis &la,
DenseSet<Value> &nonLiveSet,
RDVFinalCleanupList &cl) {
- LLVM_DEBUG(DBGS() << "Processing region branch op: "; regionBranchOp->print(
- llvm::dbgs(), OpPrintingFlags().skipRegions());
- llvm::dbgs() << "\n");
+ LDBG() << "Processing region branch op: "
+ << OpWithFlags(regionBranchOp, OpPrintingFlags().skipRegions());
// Mark live results of `regionBranchOp` in `liveResults`.
auto markLiveResults = [&](BitVector &liveResults) {
liveResults = markLives(regionBranchOp->getResults(), nonLiveSet, la);
diff --git a/mlir/lib/Transforms/Utils/DialectConversion.cpp b/mlir/lib/Transforms/Utils/DialectConversion.cpp
index d224f732a198b..466718b1be29d 100644
--- a/mlir/lib/Transforms/Utils/DialectConversion.cpp
+++ b/mlir/lib/Transforms/Utils/DialectConversion.cpp
@@ -14,6 +14,7 @@
#include "mlir/IR/Dominance.h"
#include "mlir/IR/IRMapping.h"
#include "mlir/IR/Iterators.h"
+#include "mlir/IR/Operation.h"
#include "mlir/Interfaces/FunctionInterfaces.h"
#include "mlir/Rewrite/PatternApplicator.h"
#include "llvm/ADT/SmallPtrSet.h"
@@ -2092,8 +2093,9 @@ OperationLegalizer::legalize(Operation *op,
// If the operation has no regions, just print it here.
if (!isIgnored && op->getNumRegions() == 0) {
- op->print(logger.startLine(), OpPrintingFlags().printGenericOpForm());
- logger.getOStream() << "\n\n";
+ logger.startLine() << OpWithFlags(op,
+ OpPrintingFlags().printGenericOpForm())
+ << "\n";
}
});
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