[flang-commits] [flang] [mlir] [mlir][Transforms][NFC] Improve listener layering in dialect conversion (PR #81236)
Matthias Springer via flang-commits
flang-commits at lists.llvm.org
Fri Feb 9 01:52:35 PST 2024
https://github.com/matthias-springer updated https://github.com/llvm/llvm-project/pull/81236
>From baa249a20bcc9d4ae1637c3fc693d58f9bb33bcd Mon Sep 17 00:00:00 2001
From: Matthias Springer <springerm at google.com>
Date: Tue, 6 Feb 2024 11:06:28 +0000
Subject: [PATCH] [mlir][IR][NFC] Improve listener layering in dialect
conversion
Context: Conversion patterns provide a `ConversionPatternRewriter` to modify the IR. `ConversionPatternRewriter` provides the public API. Most function calls are forwarded/handled by `ConversionPatternRewriterImpl`. The dialect conversion uses the listener infrastructure to get notified about op/block insertions.
In the current design, `ConversionPatternRewriter` inherits from both `PatternRewriter` and `Listener`. The conversion rewriter registers itself as a listener. This is problematic because listener functions such as `notifyOperationInserted` are now part of the public API and can be called from conversion patterns; that would bring the dialect conversion into an inconsistent state.
With this commit, `ConversionPatternRewriter` no longer inherits from `Listener`. Instead `ConversionPatternRewriterImpl` inherits from `Listener`. This removes the problematic public API and also simplifies the code a bit: block/op insertion notifications were previously forwarded to the `ConversionPatternRewriterImpl`. This is no longer needed.
---
.../HLFIR/Transforms/BufferizeHLFIR.cpp | 4 +-
.../mlir/Transforms/DialectConversion.h | 17 +-----
.../Async/Transforms/AsyncToAsyncRuntime.cpp | 4 +-
.../Transforms/Utils/DialectConversion.cpp | 53 +++++++++----------
4 files changed, 29 insertions(+), 49 deletions(-)
diff --git a/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp b/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
index bd8d3d92d480b6..1c4f82e2de818b 100644
--- a/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
+++ b/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
@@ -739,12 +739,12 @@ struct HLFIRListener : public mlir::OpBuilder::Listener {
void notifyOperationInserted(mlir::Operation *op,
mlir::OpBuilder::InsertPoint previous) override {
builder.notifyOperationInserted(op, previous);
- rewriter.notifyOperationInserted(op, previous);
+ rewriter.getListener()->notifyOperationInserted(op, previous);
}
virtual void notifyBlockInserted(mlir::Block *block, mlir::Region *previous,
mlir::Region::iterator previousIt) override {
builder.notifyBlockInserted(block, previous, previousIt);
- rewriter.notifyBlockInserted(block, previous, previousIt);
+ rewriter.getListener()->notifyBlockInserted(block, previous, previousIt);
}
fir::FirOpBuilder &builder;
mlir::ConversionPatternRewriter &rewriter;
diff --git a/mlir/include/mlir/Transforms/DialectConversion.h b/mlir/include/mlir/Transforms/DialectConversion.h
index b1ec1fe4ecd51a..f061d761ecefbb 100644
--- a/mlir/include/mlir/Transforms/DialectConversion.h
+++ b/mlir/include/mlir/Transforms/DialectConversion.h
@@ -632,8 +632,7 @@ struct ConversionPatternRewriterImpl;
/// This class implements a pattern rewriter for use with ConversionPatterns. It
/// extends the base PatternRewriter and provides special conversion specific
/// hooks.
-class ConversionPatternRewriter final : public PatternRewriter,
- public RewriterBase::Listener {
+class ConversionPatternRewriter final : public PatternRewriter {
public:
explicit ConversionPatternRewriter(MLIRContext *ctx);
~ConversionPatternRewriter() override;
@@ -712,10 +711,6 @@ class ConversionPatternRewriter final : public PatternRewriter,
/// implemented for dialect conversion.
void eraseBlock(Block *block) override;
- /// PatternRewriter hook creating a new block.
- void notifyBlockInserted(Block *block, Region *previous,
- Region::iterator previousIt) override;
-
/// PatternRewriter hook for splitting a block into two parts.
Block *splitBlock(Block *block, Block::iterator before) override;
@@ -724,9 +719,6 @@ class ConversionPatternRewriter final : public PatternRewriter,
ValueRange argValues = std::nullopt) override;
using PatternRewriter::inlineBlockBefore;
- /// PatternRewriter hook for inserting a new operation.
- void notifyOperationInserted(Operation *op, InsertPoint previous) override;
-
/// PatternRewriter hook for updating the given operation in-place.
/// Note: These methods only track updates to the given operation itself,
/// and not nested regions. Updates to regions will still require notification
@@ -739,18 +731,11 @@ class ConversionPatternRewriter final : public PatternRewriter,
/// PatternRewriter hook for updating the given operation in-place.
void cancelOpModification(Operation *op) override;
- /// PatternRewriter hook for notifying match failure reasons.
- void
- notifyMatchFailure(Location loc,
- function_ref<void(Diagnostic &)> reasonCallback) override;
- using PatternRewriter::notifyMatchFailure;
-
/// Return a reference to the internal implementation.
detail::ConversionPatternRewriterImpl &getImpl();
private:
// Hide unsupported pattern rewriter API.
- using OpBuilder::getListener;
using OpBuilder::setListener;
void moveOpBefore(Operation *op, Block *block,
diff --git a/mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp b/mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
index 828f53c16d8f86..31e81107f655c0 100644
--- a/mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
+++ b/mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
@@ -582,7 +582,7 @@ class AwaitOpLoweringBase : public OpConversionPattern<AwaitType> {
// Inside regular functions we use the blocking wait operation to wait for
// the async object (token, value or group) to become available.
if (!isInCoroutine) {
- ImplicitLocOpBuilder builder(loc, op, &rewriter);
+ ImplicitLocOpBuilder builder(loc, rewriter);
builder.create<RuntimeAwaitOp>(loc, operand);
// Assert that the awaited operands is not in the error state.
@@ -601,7 +601,7 @@ class AwaitOpLoweringBase : public OpConversionPattern<AwaitType> {
CoroMachinery &coro = funcCoro->getSecond();
Block *suspended = op->getBlock();
- ImplicitLocOpBuilder builder(loc, op, &rewriter);
+ ImplicitLocOpBuilder builder(loc, rewriter);
MLIRContext *ctx = op->getContext();
// Save the coroutine state and resume on a runtime managed thread when
diff --git a/mlir/lib/Transforms/Utils/DialectConversion.cpp b/mlir/lib/Transforms/Utils/DialectConversion.cpp
index e90447084d68bd..e41231d7cbd390 100644
--- a/mlir/lib/Transforms/Utils/DialectConversion.cpp
+++ b/mlir/lib/Transforms/Utils/DialectConversion.cpp
@@ -825,7 +825,7 @@ void ArgConverter::insertConversion(Block *newBlock,
//===----------------------------------------------------------------------===//
namespace mlir {
namespace detail {
-struct ConversionPatternRewriterImpl {
+struct ConversionPatternRewriterImpl : public RewriterBase::Listener {
explicit ConversionPatternRewriterImpl(PatternRewriter &rewriter)
: argConverter(rewriter, unresolvedMaterializations),
notifyCallback(nullptr) {}
@@ -903,15 +903,19 @@ struct ConversionPatternRewriterImpl {
// Rewriter Notification Hooks
//===--------------------------------------------------------------------===//
- /// PatternRewriter hook for replacing the results of an operation.
+ //// Notifies that an op was inserted.
+ void notifyOperationInserted(Operation *op,
+ OpBuilder::InsertPoint previous) override;
+
+ /// Notifies that an op is about to be replaced with the given values.
void notifyOpReplaced(Operation *op, ValueRange newValues);
/// Notifies that a block is about to be erased.
void notifyBlockIsBeingErased(Block *block);
- /// Notifies that a block was created.
- void notifyInsertedBlock(Block *block, Region *previous,
- Region::iterator previousIt);
+ /// Notifies that a block was inserted.
+ void notifyBlockInserted(Block *block, Region *previous,
+ Region::iterator previousIt) override;
/// Notifies that a block was split.
void notifySplitBlock(Block *block, Block *continuation);
@@ -921,8 +925,9 @@ struct ConversionPatternRewriterImpl {
Block::iterator before);
/// Notifies that a pattern match failed for the given reason.
- void notifyMatchFailure(Location loc,
- function_ref<void(Diagnostic &)> reasonCallback);
+ void
+ notifyMatchFailure(Location loc,
+ function_ref<void(Diagnostic &)> reasonCallback) override;
//===--------------------------------------------------------------------===//
// State
@@ -1363,6 +1368,16 @@ LogicalResult ConversionPatternRewriterImpl::convertNonEntryRegionTypes(
//===----------------------------------------------------------------------===//
// Rewriter Notification Hooks
+void ConversionPatternRewriterImpl::notifyOperationInserted(
+ Operation *op, OpBuilder::InsertPoint previous) {
+ assert(!previous.isSet() && "expected newly created op");
+ LLVM_DEBUG({
+ logger.startLine() << "** Insert : '" << op->getName() << "'(" << op
+ << ")\n";
+ });
+ createdOps.push_back(op);
+}
+
void ConversionPatternRewriterImpl::notifyOpReplaced(Operation *op,
ValueRange newValues) {
assert(newValues.size() == op->getNumResults());
@@ -1398,7 +1413,7 @@ void ConversionPatternRewriterImpl::notifyBlockIsBeingErased(Block *block) {
blockActions.push_back(BlockAction::getErase(block, {region, origNextBlock}));
}
-void ConversionPatternRewriterImpl::notifyInsertedBlock(
+void ConversionPatternRewriterImpl::notifyBlockInserted(
Block *block, Region *previous, Region::iterator previousIt) {
if (!previous) {
// This is a newly created block.
@@ -1437,7 +1452,7 @@ void ConversionPatternRewriterImpl::notifyMatchFailure(
ConversionPatternRewriter::ConversionPatternRewriter(MLIRContext *ctx)
: PatternRewriter(ctx),
impl(new detail::ConversionPatternRewriterImpl(*this)) {
- setListener(this);
+ setListener(impl.get());
}
ConversionPatternRewriter::~ConversionPatternRewriter() = default;
@@ -1540,11 +1555,6 @@ ConversionPatternRewriter::getRemappedValues(ValueRange keys,
results);
}
-void ConversionPatternRewriter::notifyBlockInserted(
- Block *block, Region *previous, Region::iterator previousIt) {
- impl->notifyInsertedBlock(block, previous, previousIt);
-}
-
Block *ConversionPatternRewriter::splitBlock(Block *block,
Block::iterator before) {
auto *continuation = block->splitBlock(before);
@@ -1572,16 +1582,6 @@ void ConversionPatternRewriter::inlineBlockBefore(Block *source, Block *dest,
eraseBlock(source);
}
-void ConversionPatternRewriter::notifyOperationInserted(Operation *op,
- InsertPoint previous) {
- assert(!previous.isSet() && "expected newly created op");
- LLVM_DEBUG({
- impl->logger.startLine()
- << "** Insert : '" << op->getName() << "'(" << op << ")\n";
- });
- impl->createdOps.push_back(op);
-}
-
void ConversionPatternRewriter::startOpModification(Operation *op) {
#ifndef NDEBUG
impl->pendingRootUpdates.insert(op);
@@ -1614,11 +1614,6 @@ void ConversionPatternRewriter::cancelOpModification(Operation *op) {
rootUpdates.erase(rootUpdates.begin() + updateIdx);
}
-void ConversionPatternRewriter::notifyMatchFailure(
- Location loc, function_ref<void(Diagnostic &)> reasonCallback) {
- impl->notifyMatchFailure(loc, reasonCallback);
-}
-
void ConversionPatternRewriter::moveOpBefore(Operation *op, Block *block,
Block::iterator iterator) {
llvm_unreachable(
More information about the flang-commits
mailing list