093e9489d5
Other methods in ValueList generally pass Idx first, and it is more convention for assignment methods to have the target on the LHS rather than RHS.
97 lines
2.8 KiB
C++
97 lines
2.8 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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/// Maximum number of valid references. Forward references exceeding the
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/// maximum must be invalid.
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unsigned RefsUpperBound;
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public:
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BitcodeReaderValueList(LLVMContext &C, size_t RefsUpperBound)
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: Context(C),
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RefsUpperBound(std::min((size_t)std::numeric_limits<unsigned>::max(),
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RefsUpperBound)) {}
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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) {
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ValuePtrs.resize(N);
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}
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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() {
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ValuePtrs.pop_back();
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}
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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(unsigned Idx, Value *V);
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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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