[Mlir-commits] [mlir] [mlir][dataflow] Propagate errors from `visitOperation` (PR #105448)
Ivan Butygin
llvmlistbot at llvm.org
Tue Aug 20 16:26:10 PDT 2024
https://github.com/Hardcode84 created https://github.com/llvm/llvm-project/pull/105448
Base `DataFlowAnalysis::visit` returns `LogicalResult`, but wrappers's Sparse/Dense/Forward/Backward `visitOperation` doesn't.
Sometimes it's needed to abort solver early if some unrecoverable condition detected inside analysis.
Update `visitOperation` to return `LogicalResult` and propagate it to `solver.initializeAndRun()`. Only `visitOperation` is updated for now, it's possible to update other hooks like `visitNonControlFlowArguments`, bit it's not needed immediately and let's keep this PR small.
Hijacked `UnderlyingValueAnalysis` test analysis to test it.
>From 0a25095b04efb7e76d8e26d4eb20b3aa5b4e89ec Mon Sep 17 00:00:00 2001
From: Ivan Butygin <ivan.butygin at gmail.com>
Date: Tue, 20 Aug 2024 23:38:51 +0200
Subject: [PATCH 1/2] [mlir][dataflow] Propagate errors from `visitOperation`
Base `DataFlowAnalysis::visit` returns `LogicalResult`, but wrappers's Sparse/Dense/Forward/Backward `visitOperation` doesn't.
Sometimes it's needed to abort solver early if some unrecoverable condition detected inside analysis.
Update `visitOperation` to return `LogicalResult` and propagate it to `solver.initializeAndRun()`.
Only `visitOperation` is updated for now, it's possible to update other hooks like `visitNonControlFlowArguments`, bit it's not needed immediately and let's keep this PR small.
Hijacked `UnderlyingValueAnalysis` test analysis to test it.
---
.../DataFlow/ConstantPropagationAnalysis.h | 7 +-
.../mlir/Analysis/DataFlow/DenseAnalysis.h | 42 ++++++------
.../Analysis/DataFlow/IntegerRangeAnalysis.h | 7 +-
.../mlir/Analysis/DataFlow/LivenessAnalysis.h | 4 +-
.../mlir/Analysis/DataFlow/SparseAnalysis.h | 26 +++----
.../DataFlow/ConstantPropagationAnalysis.cpp | 11 +--
mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp | 51 ++++++++------
.../DataFlow/IntegerRangeAnalysis.cpp | 9 ++-
.../Analysis/DataFlow/LivenessAnalysis.cpp | 11 +--
mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp | 68 +++++++++++--------
.../DataFlow/test-last-modified-error.mlir | 8 +++
.../TestDenseBackwardDataFlowAnalysis.cpp | 36 ++++++----
.../DataFlow/TestDenseDataFlowAnalysis.h | 12 +++-
.../TestDenseForwardDataFlowAnalysis.cpp | 35 ++++++----
.../TestSparseBackwardDataFlowAnalysis.cpp | 14 ++--
15 files changed, 205 insertions(+), 136 deletions(-)
create mode 100644 mlir/test/Analysis/DataFlow/test-last-modified-error.mlir
diff --git a/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h b/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
index 1bf991dc193874..d2d4ff9960ea36 100644
--- a/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
+++ b/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
@@ -101,9 +101,10 @@ class SparseConstantPropagation
public:
using SparseForwardDataFlowAnalysis::SparseForwardDataFlowAnalysis;
- void visitOperation(Operation *op,
- ArrayRef<const Lattice<ConstantValue> *> operands,
- ArrayRef<Lattice<ConstantValue> *> results) override;
+ LogicalResult
+ visitOperation(Operation *op,
+ ArrayRef<const Lattice<ConstantValue> *> operands,
+ ArrayRef<Lattice<ConstantValue> *> results) override;
void setToEntryState(Lattice<ConstantValue> *lattice) override;
};
diff --git a/mlir/include/mlir/Analysis/DataFlow/DenseAnalysis.h b/mlir/include/mlir/Analysis/DataFlow/DenseAnalysis.h
index 088b6cd7d698fc..4ad5f3fcd838c0 100644
--- a/mlir/include/mlir/Analysis/DataFlow/DenseAnalysis.h
+++ b/mlir/include/mlir/Analysis/DataFlow/DenseAnalysis.h
@@ -87,9 +87,9 @@ class AbstractDenseForwardDataFlowAnalysis : public DataFlowAnalysis {
protected:
/// Propagate the dense lattice before the execution of an operation to the
/// lattice after its execution.
- virtual void visitOperationImpl(Operation *op,
- const AbstractDenseLattice &before,
- AbstractDenseLattice *after) = 0;
+ virtual LogicalResult visitOperationImpl(Operation *op,
+ const AbstractDenseLattice &before,
+ AbstractDenseLattice *after) = 0;
/// Get the dense lattice after the execution of the given program point.
virtual AbstractDenseLattice *getLattice(ProgramPoint point) = 0;
@@ -114,7 +114,7 @@ class AbstractDenseForwardDataFlowAnalysis : public DataFlowAnalysis {
/// operation, then the state after the execution of the operation is set by
/// control-flow or the callgraph. Otherwise, this function invokes the
/// operation transfer function.
- virtual void processOperation(Operation *op);
+ virtual LogicalResult processOperation(Operation *op);
/// Propagate the dense lattice forward along the control flow edge from
/// `regionFrom` to `regionTo` regions of the `branch` operation. `nullopt`
@@ -191,8 +191,8 @@ class DenseForwardDataFlowAnalysis
/// Visit an operation with the dense lattice before its execution. This
/// function is expected to set the dense lattice after its execution and
/// trigger change propagation in case of change.
- virtual void visitOperation(Operation *op, const LatticeT &before,
- LatticeT *after) = 0;
+ virtual LogicalResult visitOperation(Operation *op, const LatticeT &before,
+ LatticeT *after) = 0;
/// Hook for customizing the behavior of lattice propagation along the call
/// control flow edges. Two types of (forward) propagation are possible here:
@@ -263,10 +263,11 @@ class DenseForwardDataFlowAnalysis
/// Type-erased wrappers that convert the abstract dense lattice to a derived
/// lattice and invoke the virtual hooks operating on the derived lattice.
- void visitOperationImpl(Operation *op, const AbstractDenseLattice &before,
- AbstractDenseLattice *after) final {
- visitOperation(op, static_cast<const LatticeT &>(before),
- static_cast<LatticeT *>(after));
+ LogicalResult visitOperationImpl(Operation *op,
+ const AbstractDenseLattice &before,
+ AbstractDenseLattice *after) final {
+ return visitOperation(op, static_cast<const LatticeT &>(before),
+ static_cast<LatticeT *>(after));
}
void visitCallControlFlowTransfer(CallOpInterface call,
CallControlFlowAction action,
@@ -326,9 +327,9 @@ class AbstractDenseBackwardDataFlowAnalysis : public DataFlowAnalysis {
protected:
/// Propagate the dense lattice after the execution of an operation to the
/// lattice before its execution.
- virtual void visitOperationImpl(Operation *op,
- const AbstractDenseLattice &after,
- AbstractDenseLattice *before) = 0;
+ virtual LogicalResult visitOperationImpl(Operation *op,
+ const AbstractDenseLattice &after,
+ AbstractDenseLattice *before) = 0;
/// Get the dense lattice before the execution of the program point. That is,
/// before the execution of the given operation or after the execution of the
@@ -353,7 +354,7 @@ class AbstractDenseBackwardDataFlowAnalysis : public DataFlowAnalysis {
/// Visit an operation. Dispatches to specialized methods for call or region
/// control-flow operations. Otherwise, this function invokes the operation
/// transfer function.
- virtual void processOperation(Operation *op);
+ virtual LogicalResult processOperation(Operation *op);
/// Propagate the dense lattice backwards along the control flow edge from
/// `regionFrom` to `regionTo` regions of the `branch` operation. `nullopt`
@@ -442,8 +443,8 @@ class DenseBackwardDataFlowAnalysis
/// Transfer function. Visits an operation with the dense lattice after its
/// execution. This function is expected to set the dense lattice before its
/// execution and trigger propagation in case of change.
- virtual void visitOperation(Operation *op, const LatticeT &after,
- LatticeT *before) = 0;
+ virtual LogicalResult visitOperation(Operation *op, const LatticeT &after,
+ LatticeT *before) = 0;
/// Hook for customizing the behavior of lattice propagation along the call
/// control flow edges. Two types of (back) propagation are possible here:
@@ -513,10 +514,11 @@ class DenseBackwardDataFlowAnalysis
/// Type-erased wrappers that convert the abstract dense lattice to a derived
/// lattice and invoke the virtual hooks operating on the derived lattice.
- void visitOperationImpl(Operation *op, const AbstractDenseLattice &after,
- AbstractDenseLattice *before) final {
- visitOperation(op, static_cast<const LatticeT &>(after),
- static_cast<LatticeT *>(before));
+ LogicalResult visitOperationImpl(Operation *op,
+ const AbstractDenseLattice &after,
+ AbstractDenseLattice *before) final {
+ return visitOperation(op, static_cast<const LatticeT &>(after),
+ static_cast<LatticeT *>(before));
}
void visitCallControlFlowTransfer(CallOpInterface call,
CallControlFlowAction action,
diff --git a/mlir/include/mlir/Analysis/DataFlow/IntegerRangeAnalysis.h b/mlir/include/mlir/Analysis/DataFlow/IntegerRangeAnalysis.h
index 191c023fb642cb..d4a5472cfde868 100644
--- a/mlir/include/mlir/Analysis/DataFlow/IntegerRangeAnalysis.h
+++ b/mlir/include/mlir/Analysis/DataFlow/IntegerRangeAnalysis.h
@@ -55,9 +55,10 @@ class IntegerRangeAnalysis
/// Visit an operation. Invoke the transfer function on each operation that
/// implements `InferIntRangeInterface`.
- void visitOperation(Operation *op,
- ArrayRef<const IntegerValueRangeLattice *> operands,
- ArrayRef<IntegerValueRangeLattice *> results) override;
+ LogicalResult
+ visitOperation(Operation *op,
+ ArrayRef<const IntegerValueRangeLattice *> operands,
+ ArrayRef<IntegerValueRangeLattice *> results) override;
/// Visit block arguments or operation results of an operation with region
/// control-flow for which values are not defined by region control-flow. This
diff --git a/mlir/include/mlir/Analysis/DataFlow/LivenessAnalysis.h b/mlir/include/mlir/Analysis/DataFlow/LivenessAnalysis.h
index caa03e26a3a423..cf1fd6e2d48caa 100644
--- a/mlir/include/mlir/Analysis/DataFlow/LivenessAnalysis.h
+++ b/mlir/include/mlir/Analysis/DataFlow/LivenessAnalysis.h
@@ -79,8 +79,8 @@ class LivenessAnalysis : public SparseBackwardDataFlowAnalysis<Liveness> {
public:
using SparseBackwardDataFlowAnalysis::SparseBackwardDataFlowAnalysis;
- void visitOperation(Operation *op, ArrayRef<Liveness *> operands,
- ArrayRef<const Liveness *> results) override;
+ LogicalResult visitOperation(Operation *op, ArrayRef<Liveness *> operands,
+ ArrayRef<const Liveness *> results) override;
void visitBranchOperand(OpOperand &operand) override;
diff --git a/mlir/include/mlir/Analysis/DataFlow/SparseAnalysis.h b/mlir/include/mlir/Analysis/DataFlow/SparseAnalysis.h
index 7aadd5409cc695..89726ae3a855c8 100644
--- a/mlir/include/mlir/Analysis/DataFlow/SparseAnalysis.h
+++ b/mlir/include/mlir/Analysis/DataFlow/SparseAnalysis.h
@@ -197,7 +197,7 @@ class AbstractSparseForwardDataFlowAnalysis : public DataFlowAnalysis {
/// The operation transfer function. Given the operand lattices, this
/// function is expected to set the result lattices.
- virtual void
+ virtual LogicalResult
visitOperationImpl(Operation *op,
ArrayRef<const AbstractSparseLattice *> operandLattices,
ArrayRef<AbstractSparseLattice *> resultLattices) = 0;
@@ -238,7 +238,7 @@ class AbstractSparseForwardDataFlowAnalysis : public DataFlowAnalysis {
/// Visit an operation. If this is a call operation or an operation with
/// region control-flow, then its result lattices are set accordingly.
/// Otherwise, the operation transfer function is invoked.
- void visitOperation(Operation *op);
+ LogicalResult visitOperation(Operation *op);
/// Visit a block to compute the lattice values of its arguments. If this is
/// an entry block, then the argument values are determined from the block's
@@ -277,8 +277,9 @@ class SparseForwardDataFlowAnalysis
/// Visit an operation with the lattices of its operands. This function is
/// expected to set the lattices of the operation's results.
- virtual void visitOperation(Operation *op, ArrayRef<const StateT *> operands,
- ArrayRef<StateT *> results) = 0;
+ virtual LogicalResult visitOperation(Operation *op,
+ ArrayRef<const StateT *> operands,
+ ArrayRef<StateT *> results) = 0;
/// Visit a call operation to an externally defined function given the
/// lattices of its arguments.
@@ -328,10 +329,10 @@ class SparseForwardDataFlowAnalysis
private:
/// Type-erased wrappers that convert the abstract lattice operands to derived
/// lattices and invoke the virtual hooks operating on the derived lattices.
- void visitOperationImpl(
+ LogicalResult visitOperationImpl(
Operation *op, ArrayRef<const AbstractSparseLattice *> operandLattices,
ArrayRef<AbstractSparseLattice *> resultLattices) override {
- visitOperation(
+ return visitOperation(
op,
{reinterpret_cast<const StateT *const *>(operandLattices.begin()),
operandLattices.size()},
@@ -387,7 +388,7 @@ class AbstractSparseBackwardDataFlowAnalysis : public DataFlowAnalysis {
/// The operation transfer function. Given the result lattices, this
/// function is expected to set the operand lattices.
- virtual void visitOperationImpl(
+ virtual LogicalResult visitOperationImpl(
Operation *op, ArrayRef<AbstractSparseLattice *> operandLattices,
ArrayRef<const AbstractSparseLattice *> resultLattices) = 0;
@@ -424,7 +425,7 @@ class AbstractSparseBackwardDataFlowAnalysis : public DataFlowAnalysis {
/// Visit an operation. If this is a call operation or an operation with
/// region control-flow, then its operand lattices are set accordingly.
/// Otherwise, the operation transfer function is invoked.
- void visitOperation(Operation *op);
+ LogicalResult visitOperation(Operation *op);
/// Visit a block.
void visitBlock(Block *block);
@@ -474,8 +475,9 @@ class SparseBackwardDataFlowAnalysis
/// Visit an operation with the lattices of its results. This function is
/// expected to set the lattices of the operation's operands.
- virtual void visitOperation(Operation *op, ArrayRef<StateT *> operands,
- ArrayRef<const StateT *> results) = 0;
+ virtual LogicalResult visitOperation(Operation *op,
+ ArrayRef<StateT *> operands,
+ ArrayRef<const StateT *> results) = 0;
/// Visit a call to an external function. This function is expected to set
/// lattice values of the call operands. By default, calls `visitCallOperand`
@@ -510,10 +512,10 @@ class SparseBackwardDataFlowAnalysis
private:
/// Type-erased wrappers that convert the abstract lattice operands to derived
/// lattices and invoke the virtual hooks operating on the derived lattices.
- void visitOperationImpl(
+ LogicalResult visitOperationImpl(
Operation *op, ArrayRef<AbstractSparseLattice *> operandLattices,
ArrayRef<const AbstractSparseLattice *> resultLattices) override {
- visitOperation(
+ return visitOperation(
op,
{reinterpret_cast<StateT *const *>(operandLattices.begin()),
operandLattices.size()},
diff --git a/mlir/lib/Analysis/DataFlow/ConstantPropagationAnalysis.cpp b/mlir/lib/Analysis/DataFlow/ConstantPropagationAnalysis.cpp
index 16799d3c82092e..56529acd71bbf8 100644
--- a/mlir/lib/Analysis/DataFlow/ConstantPropagationAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/ConstantPropagationAnalysis.cpp
@@ -43,7 +43,7 @@ void ConstantValue::print(raw_ostream &os) const {
// SparseConstantPropagation
//===----------------------------------------------------------------------===//
-void SparseConstantPropagation::visitOperation(
+LogicalResult SparseConstantPropagation::visitOperation(
Operation *op, ArrayRef<const Lattice<ConstantValue> *> operands,
ArrayRef<Lattice<ConstantValue> *> results) {
LLVM_DEBUG(llvm::dbgs() << "SCP: Visiting operation: " << *op << "\n");
@@ -54,14 +54,14 @@ void SparseConstantPropagation::visitOperation(
// folding.
if (op->getNumRegions()) {
setAllToEntryStates(results);
- return;
+ return success();
}
SmallVector<Attribute, 8> constantOperands;
constantOperands.reserve(op->getNumOperands());
for (auto *operandLattice : operands) {
if (operandLattice->getValue().isUninitialized())
- return;
+ return success();
constantOperands.push_back(operandLattice->getValue().getConstantValue());
}
@@ -77,7 +77,7 @@ void SparseConstantPropagation::visitOperation(
foldResults.reserve(op->getNumResults());
if (failed(op->fold(constantOperands, foldResults))) {
setAllToEntryStates(results);
- return;
+ return success();
}
// If the folding was in-place, mark the results as overdefined and reset
@@ -87,7 +87,7 @@ void SparseConstantPropagation::visitOperation(
op->setOperands(originalOperands);
op->setAttrs(originalAttrs);
setAllToEntryStates(results);
- return;
+ return success();
}
// Merge the fold results into the lattice for this operation.
@@ -108,6 +108,7 @@ void SparseConstantPropagation::visitOperation(
lattice, *getLatticeElement(foldResult.get<Value>()));
}
}
+ return success();
}
void SparseConstantPropagation::setToEntryState(
diff --git a/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp b/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp
index 9894810f0e04b3..33c877f78f4bf6 100644
--- a/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp
@@ -30,7 +30,9 @@ using namespace mlir::dataflow;
LogicalResult AbstractDenseForwardDataFlowAnalysis::initialize(Operation *top) {
// Visit every operation and block.
- processOperation(top);
+ if (failed(processOperation(top)))
+ return failure();
+
for (Region ®ion : top->getRegions()) {
for (Block &block : region) {
visitBlock(&block);
@@ -44,7 +46,7 @@ LogicalResult AbstractDenseForwardDataFlowAnalysis::initialize(Operation *top) {
LogicalResult AbstractDenseForwardDataFlowAnalysis::visit(ProgramPoint point) {
if (auto *op = llvm::dyn_cast_if_present<Operation *>(point))
- processOperation(op);
+ return processOperation(op);
else if (auto *block = llvm::dyn_cast_if_present<Block *>(point))
visitBlock(block);
else
@@ -94,10 +96,11 @@ void AbstractDenseForwardDataFlowAnalysis::visitCallOperation(
}
}
-void AbstractDenseForwardDataFlowAnalysis::processOperation(Operation *op) {
+LogicalResult
+AbstractDenseForwardDataFlowAnalysis::processOperation(Operation *op) {
// If the containing block is not executable, bail out.
if (!getOrCreateFor<Executable>(op, op->getBlock())->isLive())
- return;
+ return success();
// Get the dense lattice to update.
AbstractDenseLattice *after = getLattice(op);
@@ -111,16 +114,20 @@ void AbstractDenseForwardDataFlowAnalysis::processOperation(Operation *op) {
// If this op implements region control-flow, then control-flow dictates its
// transfer function.
- if (auto branch = dyn_cast<RegionBranchOpInterface>(op))
- return visitRegionBranchOperation(op, branch, after);
+ if (auto branch = dyn_cast<RegionBranchOpInterface>(op)) {
+ visitRegionBranchOperation(op, branch, after);
+ return success();
+ }
// If this is a call operation, then join its lattices across known return
// sites.
- if (auto call = dyn_cast<CallOpInterface>(op))
- return visitCallOperation(call, *before, after);
+ if (auto call = dyn_cast<CallOpInterface>(op)) {
+ visitCallOperation(call, *before, after);
+ return success();
+ }
// Invoke the operation transfer function.
- visitOperationImpl(op, *before, after);
+ return visitOperationImpl(op, *before, after);
}
void AbstractDenseForwardDataFlowAnalysis::visitBlock(Block *block) {
@@ -254,7 +261,9 @@ AbstractDenseForwardDataFlowAnalysis::getLatticeFor(ProgramPoint dependent,
LogicalResult
AbstractDenseBackwardDataFlowAnalysis::initialize(Operation *top) {
// Visit every operation and block.
- processOperation(top);
+ if (failed(processOperation(top)))
+ return failure();
+
for (Region ®ion : top->getRegions()) {
for (Block &block : region) {
visitBlock(&block);
@@ -269,7 +278,7 @@ AbstractDenseBackwardDataFlowAnalysis::initialize(Operation *top) {
LogicalResult AbstractDenseBackwardDataFlowAnalysis::visit(ProgramPoint point) {
if (auto *op = llvm::dyn_cast_if_present<Operation *>(point))
- processOperation(op);
+ return processOperation(op);
else if (auto *block = llvm::dyn_cast_if_present<Block *>(point))
visitBlock(block);
else
@@ -323,10 +332,11 @@ void AbstractDenseBackwardDataFlowAnalysis::visitCallOperation(
latticeAtCalleeEntry, latticeBeforeCall);
}
-void AbstractDenseBackwardDataFlowAnalysis::processOperation(Operation *op) {
+LogicalResult
+AbstractDenseBackwardDataFlowAnalysis::processOperation(Operation *op) {
// If the containing block is not executable, bail out.
if (!getOrCreateFor<Executable>(op, op->getBlock())->isLive())
- return;
+ return success();
// Get the dense lattice to update.
AbstractDenseLattice *before = getLattice(op);
@@ -339,14 +349,17 @@ void AbstractDenseBackwardDataFlowAnalysis::processOperation(Operation *op) {
after = getLatticeFor(op, op->getBlock());
// Special cases where control flow may dictate data flow.
- if (auto branch = dyn_cast<RegionBranchOpInterface>(op))
- return visitRegionBranchOperation(op, branch, RegionBranchPoint::parent(),
- before);
- if (auto call = dyn_cast<CallOpInterface>(op))
- return visitCallOperation(call, *after, before);
+ if (auto branch = dyn_cast<RegionBranchOpInterface>(op)) {
+ visitRegionBranchOperation(op, branch, RegionBranchPoint::parent(), before);
+ return success();
+ }
+ if (auto call = dyn_cast<CallOpInterface>(op)) {
+ visitCallOperation(call, *after, before);
+ return success();
+ }
// Invoke the operation transfer function.
- visitOperationImpl(op, *after, before);
+ return visitOperationImpl(op, *after, before);
}
void AbstractDenseBackwardDataFlowAnalysis::visitBlock(Block *block) {
diff --git a/mlir/lib/Analysis/DataFlow/IntegerRangeAnalysis.cpp b/mlir/lib/Analysis/DataFlow/IntegerRangeAnalysis.cpp
index 244ce8b9c2ac63..35d38ea02d7162 100644
--- a/mlir/lib/Analysis/DataFlow/IntegerRangeAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/IntegerRangeAnalysis.cpp
@@ -58,12 +58,14 @@ void IntegerValueRangeLattice::onUpdate(DataFlowSolver *solver) const {
dialect)));
}
-void IntegerRangeAnalysis::visitOperation(
+LogicalResult IntegerRangeAnalysis::visitOperation(
Operation *op, ArrayRef<const IntegerValueRangeLattice *> operands,
ArrayRef<IntegerValueRangeLattice *> results) {
auto inferrable = dyn_cast<InferIntRangeInterface>(op);
- if (!inferrable)
- return setAllToEntryStates(results);
+ if (!inferrable) {
+ setAllToEntryStates(results);
+ return success();
+ }
LLVM_DEBUG(llvm::dbgs() << "Inferring ranges for " << *op << "\n");
auto argRanges = llvm::map_to_vector(
@@ -99,6 +101,7 @@ void IntegerRangeAnalysis::visitOperation(
};
inferrable.inferResultRangesFromOptional(argRanges, joinCallback);
+ return success();
}
void IntegerRangeAnalysis::visitNonControlFlowArguments(
diff --git a/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp b/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp
index 7875fa9d43d9e2..57a4d4a6800be0 100644
--- a/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/LivenessAnalysis.cpp
@@ -68,9 +68,9 @@ ChangeResult Liveness::meet(const AbstractSparseLattice &other) {
/// (3.b) `A` is used to compute some value `C` and `C` is used to compute
/// `B`.
-void LivenessAnalysis::visitOperation(Operation *op,
- ArrayRef<Liveness *> operands,
- ArrayRef<const Liveness *> results) {
+LogicalResult
+LivenessAnalysis::visitOperation(Operation *op, ArrayRef<Liveness *> operands,
+ ArrayRef<const Liveness *> results) {
// This marks values of type (1.a) liveness as "live".
if (!isMemoryEffectFree(op)) {
for (auto *operand : operands)
@@ -89,6 +89,7 @@ void LivenessAnalysis::visitOperation(Operation *op,
}
addDependency(const_cast<Liveness *>(r), op);
}
+ return success();
}
void LivenessAnalysis::visitBranchOperand(OpOperand &operand) {
@@ -158,7 +159,7 @@ void LivenessAnalysis::visitBranchOperand(OpOperand &operand) {
SmallVector<const Liveness *, 4> resultsLiveness;
for (const Value result : op->getResults())
resultsLiveness.push_back(getLatticeElement(result));
- visitOperation(op, operandLiveness, resultsLiveness);
+ (void)visitOperation(op, operandLiveness, resultsLiveness);
// We also visit the parent op with the parent's results and this operand if
// `op` is a `RegionBranchTerminatorOpInterface` because its non-forwarded
@@ -170,7 +171,7 @@ void LivenessAnalysis::visitBranchOperand(OpOperand &operand) {
SmallVector<const Liveness *, 4> parentResultsLiveness;
for (const Value parentResult : parentOp->getResults())
parentResultsLiveness.push_back(getLatticeElement(parentResult));
- visitOperation(parentOp, operandLiveness, parentResultsLiveness);
+ (void)visitOperation(parentOp, operandLiveness, parentResultsLiveness);
}
void LivenessAnalysis::visitCallOperand(OpOperand &operand) {
diff --git a/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp b/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
index ad956b73e4b1d4..d47d5fec8a9a6a 100644
--- a/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
@@ -67,7 +67,9 @@ LogicalResult
AbstractSparseForwardDataFlowAnalysis::initializeRecursively(Operation *op) {
// Initialize the analysis by visiting every owner of an SSA value (all
// operations and blocks).
- visitOperation(op);
+ if (failed(visitOperation(op)))
+ return failure();
+
for (Region ®ion : op->getRegions()) {
for (Block &block : region) {
getOrCreate<Executable>(&block)->blockContentSubscribe(this);
@@ -83,7 +85,7 @@ AbstractSparseForwardDataFlowAnalysis::initializeRecursively(Operation *op) {
LogicalResult AbstractSparseForwardDataFlowAnalysis::visit(ProgramPoint point) {
if (Operation *op = llvm::dyn_cast_if_present<Operation *>(point))
- visitOperation(op);
+ return visitOperation(op);
else if (Block *block = llvm::dyn_cast_if_present<Block *>(point))
visitBlock(block);
else
@@ -91,14 +93,15 @@ LogicalResult AbstractSparseForwardDataFlowAnalysis::visit(ProgramPoint point) {
return success();
}
-void AbstractSparseForwardDataFlowAnalysis::visitOperation(Operation *op) {
+LogicalResult
+AbstractSparseForwardDataFlowAnalysis::visitOperation(Operation *op) {
// Exit early on operations with no results.
if (op->getNumResults() == 0)
- return;
+ return success();
// If the containing block is not executable, bail out.
if (!getOrCreate<Executable>(op->getBlock())->isLive())
- return;
+ return success();
// Get the result lattices.
SmallVector<AbstractSparseLattice *> resultLattices;
@@ -110,9 +113,10 @@ void AbstractSparseForwardDataFlowAnalysis::visitOperation(Operation *op) {
// The results of a region branch operation are determined by control-flow.
if (auto branch = dyn_cast<RegionBranchOpInterface>(op)) {
- return visitRegionSuccessors({branch}, branch,
- /*successor=*/RegionBranchPoint::parent(),
- resultLattices);
+ visitRegionSuccessors({branch}, branch,
+ /*successor=*/RegionBranchPoint::parent(),
+ resultLattices);
+ return success();
}
// Grab the lattice elements of the operands.
@@ -131,7 +135,8 @@ void AbstractSparseForwardDataFlowAnalysis::visitOperation(Operation *op) {
dyn_cast_if_present<CallableOpInterface>(call.resolveCallable());
if (!getSolverConfig().isInterprocedural() ||
(callable && !callable.getCallableRegion())) {
- return visitExternalCallImpl(call, operandLattices, resultLattices);
+ visitExternalCallImpl(call, operandLattices, resultLattices);
+ return success();
}
// Otherwise, the results of a call operation are determined by the
@@ -139,16 +144,19 @@ void AbstractSparseForwardDataFlowAnalysis::visitOperation(Operation *op) {
const auto *predecessors = getOrCreateFor<PredecessorState>(op, call);
// If not all return sites are known, then conservatively assume we can't
// reason about the data-flow.
- if (!predecessors->allPredecessorsKnown())
- return setAllToEntryStates(resultLattices);
+ if (!predecessors->allPredecessorsKnown()) {
+ setAllToEntryStates(resultLattices);
+ return success();
+ }
for (Operation *predecessor : predecessors->getKnownPredecessors())
- for (auto it : llvm::zip(predecessor->getOperands(), resultLattices))
- join(std::get<1>(it), *getLatticeElementFor(op, std::get<0>(it)));
- return;
+ for (auto &&[operand, resLattice] :
+ llvm::zip(predecessor->getOperands(), resultLattices))
+ join(resLattice, *getLatticeElementFor(op, operand));
+ return success();
}
// Invoke the operation transfer function.
- visitOperationImpl(op, operandLattices, resultLattices);
+ return visitOperationImpl(op, operandLattices, resultLattices);
}
void AbstractSparseForwardDataFlowAnalysis::visitBlock(Block *block) {
@@ -326,7 +334,9 @@ AbstractSparseBackwardDataFlowAnalysis::initialize(Operation *top) {
LogicalResult
AbstractSparseBackwardDataFlowAnalysis::initializeRecursively(Operation *op) {
- visitOperation(op);
+ if (failed(visitOperation(op)))
+ return failure();
+
for (Region ®ion : op->getRegions()) {
for (Block &block : region) {
getOrCreate<Executable>(&block)->blockContentSubscribe(this);
@@ -344,7 +354,7 @@ AbstractSparseBackwardDataFlowAnalysis::initializeRecursively(Operation *op) {
LogicalResult
AbstractSparseBackwardDataFlowAnalysis::visit(ProgramPoint point) {
if (Operation *op = llvm::dyn_cast_if_present<Operation *>(point))
- visitOperation(op);
+ return visitOperation(op);
else if (llvm::dyn_cast_if_present<Block *>(point))
// For backward dataflow, we don't have to do any work for the blocks
// themselves. CFG edges between blocks are processed by the BranchOp
@@ -384,10 +394,11 @@ static MutableArrayRef<OpOperand> operandsToOpOperands(OperandRange &operands) {
return MutableArrayRef<OpOperand>(operands.getBase(), operands.size());
}
-void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
+LogicalResult
+AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
// If we're in a dead block, bail out.
if (!getOrCreate<Executable>(op->getBlock())->isLive())
- return;
+ return success();
SmallVector<AbstractSparseLattice *> operandLattices =
getLatticeElements(op->getOperands());
@@ -398,7 +409,7 @@ void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
// of the parent op
if (auto branch = dyn_cast<RegionBranchOpInterface>(op)) {
visitRegionSuccessors(branch, operandLattices);
- return;
+ return success();
}
if (auto branch = dyn_cast<BranchOpInterface>(op)) {
@@ -432,7 +443,7 @@ void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
OpOperand &operand = op->getOpOperand(index);
visitBranchOperand(operand);
}
- return;
+ return success();
}
// For function calls, connect the arguments of the entry blocks to the
@@ -451,8 +462,11 @@ void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
MutableArrayRef<OpOperand> argOpOperands =
operandsToOpOperands(argOperands);
Region *region = callable.getCallableRegion();
- if (!region || region->empty() || !getSolverConfig().isInterprocedural())
- return visitExternalCallImpl(call, operandLattices, resultLattices);
+ if (!region || region->empty() ||
+ !getSolverConfig().isInterprocedural()) {
+ visitExternalCallImpl(call, operandLattices, resultLattices);
+ return success();
+ }
// Otherwise, propagate information from the entry point of the function
// back to operands whenever possible.
@@ -470,7 +484,7 @@ void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
OpOperand &opOperand = op->getOpOperand(index);
visitCallOperand(opOperand);
}
- return;
+ return success();
}
}
@@ -487,7 +501,7 @@ void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
if (auto terminator = dyn_cast<RegionBranchTerminatorOpInterface>(op)) {
if (auto branch = dyn_cast<RegionBranchOpInterface>(op->getParentOp())) {
visitRegionSuccessorsFromTerminator(terminator, branch);
- return;
+ return success();
}
}
@@ -511,11 +525,11 @@ void AbstractSparseBackwardDataFlowAnalysis::visitOperation(Operation *op) {
// for the return ops of any public functions.
setAllToExitStates(operandLattices);
}
- return;
+ return success();
}
}
- visitOperationImpl(op, operandLattices, resultLattices);
+ return visitOperationImpl(op, operandLattices, resultLattices);
}
void AbstractSparseBackwardDataFlowAnalysis::visitRegionSuccessors(
diff --git a/mlir/test/Analysis/DataFlow/test-last-modified-error.mlir b/mlir/test/Analysis/DataFlow/test-last-modified-error.mlir
new file mode 100644
index 00000000000000..e7c31ef7f0eba3
--- /dev/null
+++ b/mlir/test/Analysis/DataFlow/test-last-modified-error.mlir
@@ -0,0 +1,8 @@
+// RUN: mlir-opt -test-last-modified -verify-diagnostics %s
+
+// test error propagation from UnderlyingValueAnalysis::visitOperation
+func.func @test() {
+ // expected-error @+1 {{this op is always fails}}
+ %c0 = arith.constant { always_fail } 0 : i32
+ return
+}
diff --git a/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp b/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp
index 65592a5c5d698b..6794cbbbd89941 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp
+++ b/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp
@@ -55,8 +55,8 @@ class NextAccessAnalysis : public DenseBackwardDataFlowAnalysis<NextAccess> {
: DenseBackwardDataFlowAnalysis(solver, symbolTable),
assumeFuncReads(assumeFuncReads) {}
- void visitOperation(Operation *op, const NextAccess &after,
- NextAccess *before) override;
+ LogicalResult visitOperation(Operation *op, const NextAccess &after,
+ NextAccess *before) override;
void visitCallControlFlowTransfer(CallOpInterface call,
CallControlFlowAction action,
@@ -80,13 +80,16 @@ class NextAccessAnalysis : public DenseBackwardDataFlowAnalysis<NextAccess> {
};
} // namespace
-void NextAccessAnalysis::visitOperation(Operation *op, const NextAccess &after,
- NextAccess *before) {
+LogicalResult NextAccessAnalysis::visitOperation(Operation *op,
+ const NextAccess &after,
+ NextAccess *before) {
auto memory = dyn_cast<MemoryEffectOpInterface>(op);
// If we can't reason about the memory effects, conservatively assume we can't
// say anything about the next access.
- if (!memory)
- return setToExitState(before);
+ if (!memory) {
+ setToExitState(before);
+ return success();
+ }
SmallVector<MemoryEffects::EffectInstance> effects;
memory.getEffects(effects);
@@ -102,8 +105,10 @@ void NextAccessAnalysis::visitOperation(Operation *op, const NextAccess &after,
// Effects with unspecified value are treated conservatively and we cannot
// assume anything about the next access.
- if (!value)
- return setToExitState(before);
+ if (!value) {
+ setToExitState(before);
+ return success();
+ }
// If cannot find the most underlying value, we cannot assume anything about
// the next accesses.
@@ -115,7 +120,7 @@ void NextAccessAnalysis::visitOperation(Operation *op, const NextAccess &after,
// If the underlying value is not known yet, don't propagate.
if (!underlyingValue)
- return;
+ return success();
underlyingValues.push_back(*underlyingValue);
}
@@ -124,12 +129,15 @@ void NextAccessAnalysis::visitOperation(Operation *op, const NextAccess &after,
ChangeResult result = before->meet(after);
for (const auto &[effect, value] : llvm::zip(effects, underlyingValues)) {
// If the underlying value is known to be unknown, set to fixpoint.
- if (!value)
- return setToExitState(before);
+ if (!value) {
+ setToExitState(before);
+ return success();
+ }
result |= before->set(value, op);
}
propagateIfChanged(before, result);
+ return success();
}
void NextAccessAnalysis::visitCallControlFlowTransfer(
@@ -162,7 +170,7 @@ void NextAccessAnalysis::visitCallControlFlowTransfer(
testCallAndStore.getStoreBeforeCall()) ||
(action == CallControlFlowAction::ExitCallee &&
!testCallAndStore.getStoreBeforeCall()))) {
- visitOperation(call, after, before);
+ (void)visitOperation(call, after, before);
} else {
AbstractDenseBackwardDataFlowAnalysis::visitCallControlFlowTransfer(
call, action, after, before);
@@ -179,8 +187,8 @@ void NextAccessAnalysis::visitRegionBranchControlFlowTransfer(
((regionTo.isParent() && !testStoreWithARegion.getStoreBeforeRegion()) ||
(regionFrom.isParent() &&
testStoreWithARegion.getStoreBeforeRegion()))) {
- visitOperation(branch, static_cast<const NextAccess &>(after),
- static_cast<NextAccess *>(before));
+ (void)visitOperation(branch, static_cast<const NextAccess &>(after),
+ static_cast<NextAccess *>(before));
} else {
propagateIfChanged(before, before->meet(after));
}
diff --git a/mlir/test/lib/Analysis/DataFlow/TestDenseDataFlowAnalysis.h b/mlir/test/lib/Analysis/DataFlow/TestDenseDataFlowAnalysis.h
index 61ddc13f8a3d4a..57fe0ca458de21 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestDenseDataFlowAnalysis.h
+++ b/mlir/test/lib/Analysis/DataFlow/TestDenseDataFlowAnalysis.h
@@ -191,10 +191,16 @@ class UnderlyingValueAnalysis
using SparseForwardDataFlowAnalysis::SparseForwardDataFlowAnalysis;
/// The underlying value of the results of an operation are not known.
- void visitOperation(Operation *op,
- ArrayRef<const UnderlyingValueLattice *> operands,
- ArrayRef<UnderlyingValueLattice *> results) override {
+ LogicalResult
+ visitOperation(Operation *op,
+ ArrayRef<const UnderlyingValueLattice *> operands,
+ ArrayRef<UnderlyingValueLattice *> results) override {
+ // Hook to test error propagation from visitOperation.
+ if (op->hasAttr("always_fail"))
+ return op->emitError("this op is always fails");
+
setAllToEntryStates(results);
+ return success();
}
/// At an entry point, the underlying value of a value is itself.
diff --git a/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp b/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp
index 3f9ce2dc0bc50a..301d2a20978c84 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp
+++ b/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp
@@ -58,8 +58,8 @@ class LastModifiedAnalysis
/// is propagated with no change. If the operation allocates a resource, then
/// its reaching definitions is set to empty. If the operation writes to a
/// resource, then its reaching definition is set to the written value.
- void visitOperation(Operation *op, const LastModification &before,
- LastModification *after) override;
+ LogicalResult visitOperation(Operation *op, const LastModification &before,
+ LastModification *after) override;
void visitCallControlFlowTransfer(CallOpInterface call,
CallControlFlowAction action,
@@ -83,14 +83,15 @@ class LastModifiedAnalysis
};
} // end anonymous namespace
-void LastModifiedAnalysis::visitOperation(Operation *op,
- const LastModification &before,
- LastModification *after) {
+LogicalResult LastModifiedAnalysis::visitOperation(
+ Operation *op, const LastModification &before, LastModification *after) {
auto memory = dyn_cast<MemoryEffectOpInterface>(op);
// If we can't reason about the memory effects, then conservatively assume we
// can't deduce anything about the last modifications.
- if (!memory)
- return setToEntryState(after);
+ if (!memory) {
+ setToEntryState(after);
+ return success();
+ }
SmallVector<MemoryEffects::EffectInstance> effects;
memory.getEffects(effects);
@@ -106,8 +107,10 @@ void LastModifiedAnalysis::visitOperation(Operation *op,
// If we see an effect on anything other than a value, assume we can't
// deduce anything about the last modifications.
- if (!value)
- return setToEntryState(after);
+ if (!value) {
+ setToEntryState(after);
+ return success();
+ }
// If we cannot find the underlying value, we shouldn't just propagate the
// effects through, return the pessimistic state.
@@ -119,7 +122,7 @@ void LastModifiedAnalysis::visitOperation(Operation *op,
// If the underlying value is not yet known, don't propagate yet.
if (!underlyingValue)
- return;
+ return success();
underlyingValues.push_back(*underlyingValue);
}
@@ -128,8 +131,10 @@ void LastModifiedAnalysis::visitOperation(Operation *op,
ChangeResult result = after->join(before);
for (const auto &[effect, value] : llvm::zip(effects, underlyingValues)) {
// If the underlying value is known to be unknown, set to fixpoint state.
- if (!value)
- return setToEntryState(after);
+ if (!value) {
+ setToEntryState(after);
+ return success();
+ }
// Nothing to do for reads.
if (isa<MemoryEffects::Read>(effect.getEffect()))
@@ -138,6 +143,7 @@ void LastModifiedAnalysis::visitOperation(Operation *op,
result |= after->set(value, op);
}
propagateIfChanged(after, result);
+ return success();
}
void LastModifiedAnalysis::visitCallControlFlowTransfer(
@@ -169,7 +175,8 @@ void LastModifiedAnalysis::visitCallControlFlowTransfer(
testCallAndStore.getStoreBeforeCall()) ||
(action == CallControlFlowAction::ExitCallee &&
!testCallAndStore.getStoreBeforeCall()))) {
- return visitOperation(call, before, after);
+ (void)visitOperation(call, before, after);
+ return;
}
AbstractDenseForwardDataFlowAnalysis::visitCallControlFlowTransfer(
call, action, before, after);
@@ -188,7 +195,7 @@ void LastModifiedAnalysis::visitRegionBranchControlFlowTransfer(
[=](auto storeWithRegion) {
if ((!regionTo && !storeWithRegion.getStoreBeforeRegion()) ||
(!regionFrom && storeWithRegion.getStoreBeforeRegion()))
- visitOperation(branch, before, after);
+ (void)visitOperation(branch, before, after);
defaultHandling();
})
.Default([=](auto) { defaultHandling(); });
diff --git a/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp b/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp
index 30297380466442..bbca3e17040c5a 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp
+++ b/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp
@@ -76,8 +76,8 @@ class WrittenToAnalysis : public SparseBackwardDataFlowAnalysis<WrittenTo> {
: SparseBackwardDataFlowAnalysis(solver, symbolTable),
assumeFuncWrites(assumeFuncWrites) {}
- void visitOperation(Operation *op, ArrayRef<WrittenTo *> operands,
- ArrayRef<const WrittenTo *> results) override;
+ LogicalResult visitOperation(Operation *op, ArrayRef<WrittenTo *> operands,
+ ArrayRef<const WrittenTo *> results) override;
void visitBranchOperand(OpOperand &operand) override;
@@ -94,15 +94,16 @@ class WrittenToAnalysis : public SparseBackwardDataFlowAnalysis<WrittenTo> {
bool assumeFuncWrites;
};
-void WrittenToAnalysis::visitOperation(Operation *op,
- ArrayRef<WrittenTo *> operands,
- ArrayRef<const WrittenTo *> results) {
+LogicalResult
+WrittenToAnalysis::visitOperation(Operation *op, ArrayRef<WrittenTo *> operands,
+ ArrayRef<const WrittenTo *> results) {
if (auto store = dyn_cast<memref::StoreOp>(op)) {
SetVector<StringAttr> newWrites;
newWrites.insert(op->getAttrOfType<StringAttr>("tag_name"));
propagateIfChanged(operands[0],
operands[0]->getValue().addWrites(newWrites));
- return;
+ return success();
+ ;
} // By default, every result of an op depends on every operand.
for (const WrittenTo *r : results) {
for (WrittenTo *operand : operands) {
@@ -110,6 +111,7 @@ void WrittenToAnalysis::visitOperation(Operation *op,
}
addDependency(const_cast<WrittenTo *>(r), op);
}
+ return success();
}
void WrittenToAnalysis::visitBranchOperand(OpOperand &operand) {
>From d477db74cb860bfe3888ca5ea00c3d23935df351 Mon Sep 17 00:00:00 2001
From: Ivan Butygin <ivan.butygin at gmail.com>
Date: Wed, 21 Aug 2024 01:24:38 +0200
Subject: [PATCH 2/2] extra `;`
---
.../lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp | 1 -
1 file changed, 1 deletion(-)
diff --git a/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp b/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp
index bbca3e17040c5a..2445b58452bd60 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp
+++ b/mlir/test/lib/Analysis/DataFlow/TestSparseBackwardDataFlowAnalysis.cpp
@@ -103,7 +103,6 @@ WrittenToAnalysis::visitOperation(Operation *op, ArrayRef<WrittenTo *> operands,
propagateIfChanged(operands[0],
operands[0]->getValue().addWrites(newWrites));
return success();
- ;
} // By default, every result of an op depends on every operand.
for (const WrittenTo *r : results) {
for (WrittenTo *operand : operands) {
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