86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
//===-- Bitcode/Reader/ValueList.h - Number values --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class gives values and types Unique ID's.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_BITCODE_READER_VALUELIST_H
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#define LLVM_LIB_BITCODE_READER_VALUELIST_H
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#include "llvm/IR/ValueHandle.h"
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#include <cassert>
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#include <utility>
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#include <vector>
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namespace llvm {
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class Constant;
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class LLVMContext;
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class Type;
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class Value;
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class BitcodeReaderValueList {
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std::vector<WeakTrackingVH> ValuePtrs;
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/// As we resolve forward-referenced constants, we add information about them
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/// to this vector. This allows us to resolve them in bulk instead of
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/// resolving each reference at a time. See the code in
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/// ResolveConstantForwardRefs for more information about this.
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///
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/// The key of this vector is the placeholder constant, the value is the slot
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/// number that holds the resolved value.
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using ResolveConstantsTy = std::vector<std::pair<Constant *, unsigned>>;
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ResolveConstantsTy ResolveConstants;
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LLVMContext &Context;
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public:
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BitcodeReaderValueList(LLVMContext &C) : Context(C) {}
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~BitcodeReaderValueList() {
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assert(ResolveConstants.empty() && "Constants not resolved?");
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}
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// vector compatibility methods
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unsigned size() const { return ValuePtrs.size(); }
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void resize(unsigned N) { ValuePtrs.resize(N); }
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void push_back(Value *V) { ValuePtrs.emplace_back(V); }
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void clear() {
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assert(ResolveConstants.empty() && "Constants not resolved?");
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ValuePtrs.clear();
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}
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Value *operator[](unsigned i) const {
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assert(i < ValuePtrs.size());
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return ValuePtrs[i];
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}
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Value *back() const { return ValuePtrs.back(); }
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void pop_back() { ValuePtrs.pop_back(); }
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bool empty() const { return ValuePtrs.empty(); }
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void shrinkTo(unsigned N) {
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assert(N <= size() && "Invalid shrinkTo request!");
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ValuePtrs.resize(N);
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}
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Constant *getConstantFwdRef(unsigned Idx, Type *Ty);
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Value *getValueFwdRef(unsigned Idx, Type *Ty);
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void assignValue(Value *V, unsigned Idx);
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/// Once all constants are read, this method bulk resolves any forward
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/// references.
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void resolveConstantForwardRefs();
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};
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} // end namespace llvm
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#endif // LLVM_LIB_BITCODE_READER_VALUELIST_H
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