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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165753 91177308-0d34-0410-b5e6-96231b3b80d8
346 lines
12 KiB
C++
346 lines
12 KiB
C++
//===- BitcodeReader.h - Internal BitcodeReader impl ------------*- 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 header defines the BitcodeReader class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef BITCODE_READER_H
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#define BITCODE_READER_H
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#include "llvm/GVMaterializer.h"
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#include "llvm/Attributes.h"
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#include "llvm/Type.h"
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#include "llvm/OperandTraits.h"
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#include "llvm/Bitcode/BitstreamReader.h"
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#include "llvm/Bitcode/LLVMBitCodes.h"
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#include "llvm/Support/ValueHandle.h"
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#include "llvm/ADT/DenseMap.h"
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#include <vector>
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namespace llvm {
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class MemoryBuffer;
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class LLVMContext;
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//===----------------------------------------------------------------------===//
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// BitcodeReaderValueList Class
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//===----------------------------------------------------------------------===//
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class BitcodeReaderValueList {
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std::vector<WeakVH> ValuePtrs;
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/// ResolveConstants - As we resolve forward-referenced constants, we add
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/// information about them to this vector. This allows us to resolve them in
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/// bulk instead of 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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typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy;
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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) {
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ValuePtrs.push_back(V);
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}
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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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/// ResolveConstantForwardRefs - Once all constants are read, this method bulk
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/// resolves any forward references.
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void ResolveConstantForwardRefs();
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};
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//===----------------------------------------------------------------------===//
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// BitcodeReaderMDValueList Class
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//===----------------------------------------------------------------------===//
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class BitcodeReaderMDValueList {
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std::vector<WeakVH> MDValuePtrs;
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LLVMContext &Context;
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public:
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BitcodeReaderMDValueList(LLVMContext& C) : Context(C) {}
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// vector compatibility methods
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unsigned size() const { return MDValuePtrs.size(); }
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void resize(unsigned N) { MDValuePtrs.resize(N); }
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void push_back(Value *V) { MDValuePtrs.push_back(V); }
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void clear() { MDValuePtrs.clear(); }
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Value *back() const { return MDValuePtrs.back(); }
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void pop_back() { MDValuePtrs.pop_back(); }
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bool empty() const { return MDValuePtrs.empty(); }
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Value *operator[](unsigned i) const {
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assert(i < MDValuePtrs.size());
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return MDValuePtrs[i];
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}
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void shrinkTo(unsigned N) {
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assert(N <= size() && "Invalid shrinkTo request!");
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MDValuePtrs.resize(N);
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}
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Value *getValueFwdRef(unsigned Idx);
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void AssignValue(Value *V, unsigned Idx);
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};
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class BitcodeReader : public GVMaterializer {
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LLVMContext &Context;
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Module *TheModule;
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MemoryBuffer *Buffer;
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bool BufferOwned;
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OwningPtr<BitstreamReader> StreamFile;
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BitstreamCursor Stream;
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DataStreamer *LazyStreamer;
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uint64_t NextUnreadBit;
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bool SeenValueSymbolTable;
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const char *ErrorString;
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std::vector<Type*> TypeList;
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BitcodeReaderValueList ValueList;
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BitcodeReaderMDValueList MDValueList;
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SmallVector<Instruction *, 64> InstructionList;
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SmallVector<SmallVector<uint64_t, 64>, 64> UseListRecords;
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std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
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std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
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/// MAttributes - The set of attributes by index. Index zero in the
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/// file is for null, and is thus not represented here. As such all indices
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/// are off by one.
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std::vector<AttrListPtr> MAttributes;
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/// FunctionBBs - While parsing a function body, this is a list of the basic
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/// blocks for the function.
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std::vector<BasicBlock*> FunctionBBs;
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// When reading the module header, this list is populated with functions that
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// have bodies later in the file.
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std::vector<Function*> FunctionsWithBodies;
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// When intrinsic functions are encountered which require upgrading they are
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// stored here with their replacement function.
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typedef std::vector<std::pair<Function*, Function*> > UpgradedIntrinsicMap;
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UpgradedIntrinsicMap UpgradedIntrinsics;
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// Map the bitcode's custom MDKind ID to the Module's MDKind ID.
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DenseMap<unsigned, unsigned> MDKindMap;
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// Several operations happen after the module header has been read, but
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// before function bodies are processed. This keeps track of whether
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// we've done this yet.
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bool SeenFirstFunctionBody;
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/// DeferredFunctionInfo - When function bodies are initially scanned, this
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/// map contains info about where to find deferred function body in the
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/// stream.
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DenseMap<Function*, uint64_t> DeferredFunctionInfo;
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/// BlockAddrFwdRefs - These are blockaddr references to basic blocks. These
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/// are resolved lazily when functions are loaded.
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typedef std::pair<unsigned, GlobalVariable*> BlockAddrRefTy;
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DenseMap<Function*, std::vector<BlockAddrRefTy> > BlockAddrFwdRefs;
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/// UseRelativeIDs - Indicates that we are using a new encoding for
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/// instruction operands where most operands in the current
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/// FUNCTION_BLOCK are encoded relative to the instruction number,
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/// for a more compact encoding. Some instruction operands are not
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/// relative to the instruction ID: basic block numbers, and types.
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/// Once the old style function blocks have been phased out, we would
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/// not need this flag.
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bool UseRelativeIDs;
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public:
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explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext &C)
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: Context(C), TheModule(0), Buffer(buffer), BufferOwned(false),
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LazyStreamer(0), NextUnreadBit(0), SeenValueSymbolTable(false),
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ErrorString(0), ValueList(C), MDValueList(C),
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SeenFirstFunctionBody(false), UseRelativeIDs(false) {
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}
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explicit BitcodeReader(DataStreamer *streamer, LLVMContext &C)
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: Context(C), TheModule(0), Buffer(0), BufferOwned(false),
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LazyStreamer(streamer), NextUnreadBit(0), SeenValueSymbolTable(false),
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ErrorString(0), ValueList(C), MDValueList(C),
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SeenFirstFunctionBody(false), UseRelativeIDs(false) {
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}
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~BitcodeReader() {
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FreeState();
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}
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void materializeForwardReferencedFunctions();
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void FreeState();
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/// setBufferOwned - If this is true, the reader will destroy the MemoryBuffer
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/// when the reader is destroyed.
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void setBufferOwned(bool Owned) { BufferOwned = Owned; }
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virtual bool isMaterializable(const GlobalValue *GV) const;
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virtual bool isDematerializable(const GlobalValue *GV) const;
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virtual bool Materialize(GlobalValue *GV, std::string *ErrInfo = 0);
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virtual bool MaterializeModule(Module *M, std::string *ErrInfo = 0);
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virtual void Dematerialize(GlobalValue *GV);
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bool Error(const char *Str) {
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ErrorString = Str;
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return true;
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}
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const char *getErrorString() const { return ErrorString; }
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/// @brief Main interface to parsing a bitcode buffer.
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/// @returns true if an error occurred.
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bool ParseBitcodeInto(Module *M);
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/// @brief Cheap mechanism to just extract module triple
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/// @returns true if an error occurred.
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bool ParseTriple(std::string &Triple);
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static uint64_t decodeSignRotatedValue(uint64_t V);
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private:
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Type *getTypeByID(unsigned ID);
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Value *getFnValueByID(unsigned ID, Type *Ty) {
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if (Ty && Ty->isMetadataTy())
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return MDValueList.getValueFwdRef(ID);
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return ValueList.getValueFwdRef(ID, Ty);
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}
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BasicBlock *getBasicBlock(unsigned ID) const {
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if (ID >= FunctionBBs.size()) return 0; // Invalid ID
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return FunctionBBs[ID];
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}
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AttrListPtr getAttributes(unsigned i) const {
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if (i-1 < MAttributes.size())
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return MAttributes[i-1];
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return AttrListPtr();
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}
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/// getValueTypePair - Read a value/type pair out of the specified record from
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/// slot 'Slot'. Increment Slot past the number of slots used in the record.
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/// Return true on failure.
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bool getValueTypePair(SmallVector<uint64_t, 64> &Record, unsigned &Slot,
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unsigned InstNum, Value *&ResVal) {
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if (Slot == Record.size()) return true;
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unsigned ValNo = (unsigned)Record[Slot++];
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// Adjust the ValNo, if it was encoded relative to the InstNum.
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if (UseRelativeIDs)
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ValNo = InstNum - ValNo;
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if (ValNo < InstNum) {
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// If this is not a forward reference, just return the value we already
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// have.
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ResVal = getFnValueByID(ValNo, 0);
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return ResVal == 0;
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} else if (Slot == Record.size()) {
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return true;
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}
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unsigned TypeNo = (unsigned)Record[Slot++];
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ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo));
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return ResVal == 0;
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}
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/// popValue - Read a value out of the specified record from slot 'Slot'.
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/// Increment Slot past the number of slots used by the value in the record.
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/// Return true if there is an error.
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bool popValue(SmallVector<uint64_t, 64> &Record, unsigned &Slot,
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unsigned InstNum, Type *Ty, Value *&ResVal) {
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if (getValue(Record, Slot, InstNum, Ty, ResVal))
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return true;
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// All values currently take a single record slot.
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++Slot;
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return false;
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}
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/// getValue -- Like popValue, but does not increment the Slot number.
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bool getValue(SmallVector<uint64_t, 64> &Record, unsigned Slot,
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unsigned InstNum, Type *Ty, Value *&ResVal) {
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ResVal = getValue(Record, Slot, InstNum, Ty);
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return ResVal == 0;
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}
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/// getValue -- Version of getValue that returns ResVal directly,
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/// or 0 if there is an error.
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Value *getValue(SmallVector<uint64_t, 64> &Record, unsigned Slot,
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unsigned InstNum, Type *Ty) {
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if (Slot == Record.size()) return 0;
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unsigned ValNo = (unsigned)Record[Slot];
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// Adjust the ValNo, if it was encoded relative to the InstNum.
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if (UseRelativeIDs)
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ValNo = InstNum - ValNo;
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return getFnValueByID(ValNo, Ty);
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}
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/// getValueSigned -- Like getValue, but decodes signed VBRs.
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Value *getValueSigned(SmallVector<uint64_t, 64> &Record, unsigned Slot,
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unsigned InstNum, Type *Ty) {
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if (Slot == Record.size()) return 0;
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unsigned ValNo = (unsigned)decodeSignRotatedValue(Record[Slot]);
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// Adjust the ValNo, if it was encoded relative to the InstNum.
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if (UseRelativeIDs)
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ValNo = InstNum - ValNo;
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return getFnValueByID(ValNo, Ty);
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}
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bool ParseModule(bool Resume);
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bool ParseAttributeBlock();
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bool ParseTypeTable();
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bool ParseTypeTableBody();
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bool ParseValueSymbolTable();
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bool ParseConstants();
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bool RememberAndSkipFunctionBody();
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bool ParseFunctionBody(Function *F);
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bool GlobalCleanup();
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bool ResolveGlobalAndAliasInits();
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bool ParseMetadata();
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bool ParseMetadataAttachment();
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bool ParseModuleTriple(std::string &Triple);
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bool ParseUseLists();
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bool InitStream();
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bool InitStreamFromBuffer();
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bool InitLazyStream();
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bool FindFunctionInStream(Function *F,
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DenseMap<Function*, uint64_t>::iterator DeferredFunctionInfoIterator);
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};
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} // End llvm namespace
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#endif
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