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This commit extends the 'SlotMapping' structure and includes mappings for named and numbered types in it. The LLParser is extended accordingly to fill out those mappings at the end of module parsing. This information is useful when we want to parse standalone constant values at a later stage using the 'parseConstantValue' method. The constant values can be constant expressions, which can contain references to types. In order to parse such constant values, we have to restore the internal named and numbered mappings for the types in LLParser, otherwise the parser will report a parsing error. Therefore, this commit also introduces a new method called 'restoreParsingState' to LLParser, which uses the slot mappings to restore some of its internal parsing state. This commit is required to serialize constant value pointers in the machine memory operands for the MIR format. Reviewers: Duncan P. N. Exon Smith llvm-svn: 245740
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
//===-- SlotMapping.h - Slot number mapping for unnamed values --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the SlotMapping struct.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ASMPARSER_SLOTMAPPING_H
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#define LLVM_ASMPARSER_SLOTMAPPING_H
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#include "llvm/ADT/StringMap.h"
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#include "llvm/IR/TrackingMDRef.h"
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#include <map>
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#include <vector>
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namespace llvm {
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class GlobalValue;
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class Type;
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/// This struct contains the mappings from the slot numbers to unnamed metadata
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/// nodes, global values and types. It also contains the mapping for the named
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/// types.
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/// It can be used to save the parsing state of an LLVM IR module so that the
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/// textual references to the values in the module can be parsed outside of the
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/// module's source.
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struct SlotMapping {
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std::vector<GlobalValue *> GlobalValues;
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std::map<unsigned, TrackingMDNodeRef> MetadataNodes;
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StringMap<Type *> NamedTypes;
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std::map<unsigned, Type *> Types;
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};
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} // end namespace llvm
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#endif
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