91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
|
//===- SSAUpdaterBulk.h - Unstructured SSA Update Tool ----------*- C++ -*-===//
|
||
|
|
//
|
||
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
||
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
||
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// This file declares the SSAUpdaterBulk class.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#ifndef LLVM_TRANSFORMS_UTILS_SSAUPDATERBULK_H
|
||
|
|
#define LLVM_TRANSFORMS_UTILS_SSAUPDATERBULK_H
|
||
|
|
|
||
|
|
#include "llvm/ADT/DenseMap.h"
|
||
|
|
#include "llvm/ADT/StringRef.h"
|
||
|
|
#include "llvm/IR/PredIteratorCache.h"
|
||
|
|
|
||
|
|
namespace llvm {
|
||
|
|
|
||
|
|
class BasicBlock;
|
||
|
|
class PHINode;
|
||
|
|
template <typename T> class SmallVectorImpl;
|
||
|
|
class Type;
|
||
|
|
class Use;
|
||
|
|
class Value;
|
||
|
|
class DominatorTree;
|
||
|
|
|
||
|
|
/// Helper class for SSA formation on a set of values defined in multiple
|
||
|
|
/// blocks.
|
||
|
|
///
|
||
|
|
/// This is used when code duplication or another unstructured transformation
|
||
|
|
/// wants to rewrite a set of uses of one value with uses of a set of values.
|
||
|
|
/// The update is done only when RewriteAllUses is called, all other methods are
|
||
|
|
/// used for book-keeping. That helps to share some common computations between
|
||
|
|
/// updates of different uses (which is not the case when traditional SSAUpdater
|
||
|
|
/// is used).
|
||
|
|
class SSAUpdaterBulk {
|
||
|
|
struct RewriteInfo {
|
||
|
|
DenseMap<BasicBlock *, Value *> Defines;
|
||
|
|
SmallVector<Use *, 4> Uses;
|
||
|
|
StringRef Name;
|
||
|
|
Type *Ty;
|
||
|
|
RewriteInfo(){};
|
||
|
|
RewriteInfo(StringRef &N, Type *T) : Name(N), Ty(T){};
|
||
|
|
};
|
||
|
|
SmallVector<RewriteInfo, 4> Rewrites;
|
||
|
|
|
||
|
|
PredIteratorCache PredCache;
|
||
|
|
|
||
|
|
Value *computeValueAt(BasicBlock *BB, RewriteInfo &R, DominatorTree *DT);
|
||
|
|
|
||
|
|
public:
|
||
|
|
explicit SSAUpdaterBulk(){};
|
||
|
|
SSAUpdaterBulk(const SSAUpdaterBulk &) = delete;
|
||
|
|
SSAUpdaterBulk &operator=(const SSAUpdaterBulk &) = delete;
|
||
|
|
~SSAUpdaterBulk(){};
|
||
|
|
|
||
|
|
/// Add a new variable to the SSA rewriter. This needs to be called before
|
||
|
|
/// AddAvailableValue or AddUse calls. The return value is the variable ID,
|
||
|
|
/// which needs to be passed to AddAvailableValue and AddUse.
|
||
|
|
unsigned AddVariable(StringRef Name, Type *Ty);
|
||
|
|
|
||
|
|
/// Indicate that a rewritten value is available in the specified block with
|
||
|
|
/// the specified value.
|
||
|
|
void AddAvailableValue(unsigned Var, BasicBlock *BB, Value *V);
|
||
|
|
|
||
|
|
/// Record a use of the symbolic value. This use will be updated with a
|
||
|
|
/// rewritten value when RewriteAllUses is called.
|
||
|
|
void AddUse(unsigned Var, Use *U);
|
||
|
|
|
||
|
|
/// Return true if the SSAUpdater already has a value for the specified
|
||
|
|
/// variable in the specified block.
|
||
|
|
bool HasValueForBlock(unsigned Var, BasicBlock *BB);
|
||
|
|
|
||
|
|
/// Perform all the necessary updates, including new PHI-nodes insertion and
|
||
|
|
/// the requested uses update.
|
||
|
|
///
|
||
|
|
/// The function requires dominator tree DT, which is used for computing
|
||
|
|
/// locations for new phi-nodes insertions. If a nonnull pointer to a vector
|
||
|
|
/// InsertedPHIs is passed, all the new phi-nodes will be added to this
|
||
|
|
/// vector.
|
||
|
|
void RewriteAllUses(DominatorTree *DT,
|
||
|
|
SmallVectorImpl<PHINode *> *InsertedPHIs = nullptr);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // end namespace llvm
|
||
|
|
|
||
|
|
#endif // LLVM_TRANSFORMS_UTILS_SSAUPDATERBULK_H
|