[llvm] r232542 - Internalize BitcodeReader. Not used outside of BitcodeReader.cpp.
Benjamin Kramer
benny.kra at googlemail.com
Tue Mar 17 13:40:25 PDT 2015
Author: d0k
Date: Tue Mar 17 15:40:24 2015
New Revision: 232542
URL: http://llvm.org/viewvc/llvm-project?rev=232542&view=rev
Log:
Internalize BitcodeReader. Not used outside of BitcodeReader.cpp.
NFC.
Removed:
llvm/trunk/lib/Bitcode/Reader/BitcodeReader.h
Modified:
llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp
Modified: llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp?rev=232542&r1=232541&r2=232542&view=diff
==============================================================================
--- llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp (original)
+++ llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp Tue Mar 17 15:40:24 2015
@@ -8,35 +8,375 @@
//===----------------------------------------------------------------------===//
#include "llvm/Bitcode/ReaderWriter.h"
-#include "BitcodeReader.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Triple.h"
+#include "llvm/Bitcode/BitstreamReader.h"
#include "llvm/Bitcode/LLVMBitCodes.h"
#include "llvm/IR/AutoUpgrade.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/DiagnosticPrinter.h"
+#include "llvm/IR/GVMaterializer.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/OperandTraits.h"
#include "llvm/IR/Operator.h"
+#include "llvm/IR/ValueHandle.h"
#include "llvm/Support/DataStream.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
-
+#include <deque>
using namespace llvm;
+namespace {
enum {
SWITCH_INST_MAGIC = 0x4B5 // May 2012 => 1205 => Hex
};
+class BitcodeReaderValueList {
+ std::vector<WeakVH> ValuePtrs;
+
+ /// ResolveConstants - As we resolve forward-referenced constants, we add
+ /// information about them to this vector. This allows us to resolve them in
+ /// bulk instead of resolving each reference at a time. See the code in
+ /// ResolveConstantForwardRefs for more information about this.
+ ///
+ /// The key of this vector is the placeholder constant, the value is the slot
+ /// number that holds the resolved value.
+ typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy;
+ ResolveConstantsTy ResolveConstants;
+ LLVMContext &Context;
+public:
+ BitcodeReaderValueList(LLVMContext &C) : Context(C) {}
+ ~BitcodeReaderValueList() {
+ assert(ResolveConstants.empty() && "Constants not resolved?");
+ }
+
+ // vector compatibility methods
+ unsigned size() const { return ValuePtrs.size(); }
+ void resize(unsigned N) { ValuePtrs.resize(N); }
+ void push_back(Value *V) {
+ ValuePtrs.push_back(V);
+ }
+
+ void clear() {
+ assert(ResolveConstants.empty() && "Constants not resolved?");
+ ValuePtrs.clear();
+ }
+
+ Value *operator[](unsigned i) const {
+ assert(i < ValuePtrs.size());
+ return ValuePtrs[i];
+ }
+
+ Value *back() const { return ValuePtrs.back(); }
+ void pop_back() { ValuePtrs.pop_back(); }
+ bool empty() const { return ValuePtrs.empty(); }
+ void shrinkTo(unsigned N) {
+ assert(N <= size() && "Invalid shrinkTo request!");
+ ValuePtrs.resize(N);
+ }
+
+ Constant *getConstantFwdRef(unsigned Idx, Type *Ty);
+ Value *getValueFwdRef(unsigned Idx, Type *Ty);
+
+ void AssignValue(Value *V, unsigned Idx);
+
+ /// ResolveConstantForwardRefs - Once all constants are read, this method bulk
+ /// resolves any forward references.
+ void ResolveConstantForwardRefs();
+};
+
+class BitcodeReaderMDValueList {
+ unsigned NumFwdRefs;
+ bool AnyFwdRefs;
+ unsigned MinFwdRef;
+ unsigned MaxFwdRef;
+ std::vector<TrackingMDRef> MDValuePtrs;
+
+ LLVMContext &Context;
+public:
+ BitcodeReaderMDValueList(LLVMContext &C)
+ : NumFwdRefs(0), AnyFwdRefs(false), Context(C) {}
+
+ // vector compatibility methods
+ unsigned size() const { return MDValuePtrs.size(); }
+ void resize(unsigned N) { MDValuePtrs.resize(N); }
+ void push_back(Metadata *MD) { MDValuePtrs.emplace_back(MD); }
+ void clear() { MDValuePtrs.clear(); }
+ Metadata *back() const { return MDValuePtrs.back(); }
+ void pop_back() { MDValuePtrs.pop_back(); }
+ bool empty() const { return MDValuePtrs.empty(); }
+
+ Metadata *operator[](unsigned i) const {
+ assert(i < MDValuePtrs.size());
+ return MDValuePtrs[i];
+ }
+
+ void shrinkTo(unsigned N) {
+ assert(N <= size() && "Invalid shrinkTo request!");
+ MDValuePtrs.resize(N);
+ }
+
+ Metadata *getValueFwdRef(unsigned Idx);
+ void AssignValue(Metadata *MD, unsigned Idx);
+ void tryToResolveCycles();
+};
+
+class BitcodeReader : public GVMaterializer {
+ LLVMContext &Context;
+ DiagnosticHandlerFunction DiagnosticHandler;
+ Module *TheModule;
+ std::unique_ptr<MemoryBuffer> Buffer;
+ std::unique_ptr<BitstreamReader> StreamFile;
+ BitstreamCursor Stream;
+ DataStreamer *LazyStreamer;
+ uint64_t NextUnreadBit;
+ bool SeenValueSymbolTable;
+
+ std::vector<Type*> TypeList;
+ BitcodeReaderValueList ValueList;
+ BitcodeReaderMDValueList MDValueList;
+ std::vector<Comdat *> ComdatList;
+ SmallVector<Instruction *, 64> InstructionList;
+
+ std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
+ std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
+ std::vector<std::pair<Function*, unsigned> > FunctionPrefixes;
+ std::vector<std::pair<Function*, unsigned> > FunctionPrologues;
+
+ SmallVector<Instruction*, 64> InstsWithTBAATag;
+
+ /// MAttributes - The set of attributes by index. Index zero in the
+ /// file is for null, and is thus not represented here. As such all indices
+ /// are off by one.
+ std::vector<AttributeSet> MAttributes;
+
+ /// \brief The set of attribute groups.
+ std::map<unsigned, AttributeSet> MAttributeGroups;
+
+ /// FunctionBBs - While parsing a function body, this is a list of the basic
+ /// blocks for the function.
+ std::vector<BasicBlock*> FunctionBBs;
+
+ // When reading the module header, this list is populated with functions that
+ // have bodies later in the file.
+ std::vector<Function*> FunctionsWithBodies;
+
+ // When intrinsic functions are encountered which require upgrading they are
+ // stored here with their replacement function.
+ typedef std::vector<std::pair<Function*, Function*> > UpgradedIntrinsicMap;
+ UpgradedIntrinsicMap UpgradedIntrinsics;
+
+ // Map the bitcode's custom MDKind ID to the Module's MDKind ID.
+ DenseMap<unsigned, unsigned> MDKindMap;
+
+ // Several operations happen after the module header has been read, but
+ // before function bodies are processed. This keeps track of whether
+ // we've done this yet.
+ bool SeenFirstFunctionBody;
+
+ /// DeferredFunctionInfo - When function bodies are initially scanned, this
+ /// map contains info about where to find deferred function body in the
+ /// stream.
+ DenseMap<Function*, uint64_t> DeferredFunctionInfo;
+
+ /// When Metadata block is initially scanned when parsing the module, we may
+ /// choose to defer parsing of the metadata. This vector contains info about
+ /// which Metadata blocks are deferred.
+ std::vector<uint64_t> DeferredMetadataInfo;
+
+ /// These are basic blocks forward-referenced by block addresses. They are
+ /// inserted lazily into functions when they're loaded. The basic block ID is
+ /// its index into the vector.
+ DenseMap<Function *, std::vector<BasicBlock *>> BasicBlockFwdRefs;
+ std::deque<Function *> BasicBlockFwdRefQueue;
+
+ /// UseRelativeIDs - Indicates that we are using a new encoding for
+ /// instruction operands where most operands in the current
+ /// FUNCTION_BLOCK are encoded relative to the instruction number,
+ /// for a more compact encoding. Some instruction operands are not
+ /// relative to the instruction ID: basic block numbers, and types.
+ /// Once the old style function blocks have been phased out, we would
+ /// not need this flag.
+ bool UseRelativeIDs;
+
+ /// True if all functions will be materialized, negating the need to process
+ /// (e.g.) blockaddress forward references.
+ bool WillMaterializeAllForwardRefs;
+
+ /// Functions that have block addresses taken. This is usually empty.
+ SmallPtrSet<const Function *, 4> BlockAddressesTaken;
+
+ /// True if any Metadata block has been materialized.
+ bool IsMetadataMaterialized;
+
+public:
+ std::error_code Error(BitcodeError E, const Twine &Message);
+ std::error_code Error(BitcodeError E);
+ std::error_code Error(const Twine &Message);
+
+ explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext &C,
+ DiagnosticHandlerFunction DiagnosticHandler);
+ explicit BitcodeReader(DataStreamer *streamer, LLVMContext &C,
+ DiagnosticHandlerFunction DiagnosticHandler);
+ ~BitcodeReader() { FreeState(); }
+
+ std::error_code materializeForwardReferencedFunctions();
+
+ void FreeState();
+
+ void releaseBuffer();
+
+ bool isDematerializable(const GlobalValue *GV) const override;
+ std::error_code materialize(GlobalValue *GV) override;
+ std::error_code MaterializeModule(Module *M) override;
+ std::vector<StructType *> getIdentifiedStructTypes() const override;
+ void Dematerialize(GlobalValue *GV) override;
+
+ /// @brief Main interface to parsing a bitcode buffer.
+ /// @returns true if an error occurred.
+ std::error_code ParseBitcodeInto(Module *M,
+ bool ShouldLazyLoadMetadata = false);
+
+ /// @brief Cheap mechanism to just extract module triple
+ /// @returns true if an error occurred.
+ ErrorOr<std::string> parseTriple();
+
+ static uint64_t decodeSignRotatedValue(uint64_t V);
+
+ /// Materialize any deferred Metadata block.
+ std::error_code materializeMetadata() override;
+
+private:
+ std::vector<StructType *> IdentifiedStructTypes;
+ StructType *createIdentifiedStructType(LLVMContext &Context, StringRef Name);
+ StructType *createIdentifiedStructType(LLVMContext &Context);
+
+ Type *getTypeByID(unsigned ID);
+ Value *getFnValueByID(unsigned ID, Type *Ty) {
+ if (Ty && Ty->isMetadataTy())
+ return MetadataAsValue::get(Ty->getContext(), getFnMetadataByID(ID));
+ return ValueList.getValueFwdRef(ID, Ty);
+ }
+ Metadata *getFnMetadataByID(unsigned ID) {
+ return MDValueList.getValueFwdRef(ID);
+ }
+ BasicBlock *getBasicBlock(unsigned ID) const {
+ if (ID >= FunctionBBs.size()) return nullptr; // Invalid ID
+ return FunctionBBs[ID];
+ }
+ AttributeSet getAttributes(unsigned i) const {
+ if (i-1 < MAttributes.size())
+ return MAttributes[i-1];
+ return AttributeSet();
+ }
+
+ /// getValueTypePair - Read a value/type pair out of the specified record from
+ /// slot 'Slot'. Increment Slot past the number of slots used in the record.
+ /// Return true on failure.
+ bool getValueTypePair(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
+ unsigned InstNum, Value *&ResVal) {
+ if (Slot == Record.size()) return true;
+ unsigned ValNo = (unsigned)Record[Slot++];
+ // Adjust the ValNo, if it was encoded relative to the InstNum.
+ if (UseRelativeIDs)
+ ValNo = InstNum - ValNo;
+ if (ValNo < InstNum) {
+ // If this is not a forward reference, just return the value we already
+ // have.
+ ResVal = getFnValueByID(ValNo, nullptr);
+ return ResVal == nullptr;
+ } else if (Slot == Record.size()) {
+ return true;
+ }
+
+ unsigned TypeNo = (unsigned)Record[Slot++];
+ ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo));
+ return ResVal == nullptr;
+ }
+
+ /// popValue - Read a value out of the specified record from slot 'Slot'.
+ /// Increment Slot past the number of slots used by the value in the record.
+ /// Return true if there is an error.
+ bool popValue(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
+ unsigned InstNum, Type *Ty, Value *&ResVal) {
+ if (getValue(Record, Slot, InstNum, Ty, ResVal))
+ return true;
+ // All values currently take a single record slot.
+ ++Slot;
+ return false;
+ }
+
+ /// getValue -- Like popValue, but does not increment the Slot number.
+ bool getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
+ unsigned InstNum, Type *Ty, Value *&ResVal) {
+ ResVal = getValue(Record, Slot, InstNum, Ty);
+ return ResVal == nullptr;
+ }
+
+ /// getValue -- Version of getValue that returns ResVal directly,
+ /// or 0 if there is an error.
+ Value *getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
+ unsigned InstNum, Type *Ty) {
+ if (Slot == Record.size()) return nullptr;
+ unsigned ValNo = (unsigned)Record[Slot];
+ // Adjust the ValNo, if it was encoded relative to the InstNum.
+ if (UseRelativeIDs)
+ ValNo = InstNum - ValNo;
+ return getFnValueByID(ValNo, Ty);
+ }
+
+ /// getValueSigned -- Like getValue, but decodes signed VBRs.
+ Value *getValueSigned(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
+ unsigned InstNum, Type *Ty) {
+ if (Slot == Record.size()) return nullptr;
+ unsigned ValNo = (unsigned)decodeSignRotatedValue(Record[Slot]);
+ // Adjust the ValNo, if it was encoded relative to the InstNum.
+ if (UseRelativeIDs)
+ ValNo = InstNum - ValNo;
+ return getFnValueByID(ValNo, Ty);
+ }
+
+ /// Converts alignment exponent (i.e. power of two (or zero)) to the
+ /// corresponding alignment to use. If alignment is too large, returns
+ /// a corresponding error code.
+ std::error_code parseAlignmentValue(uint64_t Exponent, unsigned &Alignment);
+ std::error_code ParseAttrKind(uint64_t Code, Attribute::AttrKind *Kind);
+ std::error_code ParseModule(bool Resume, bool ShouldLazyLoadMetadata = false);
+ std::error_code ParseAttributeBlock();
+ std::error_code ParseAttributeGroupBlock();
+ std::error_code ParseTypeTable();
+ std::error_code ParseTypeTableBody();
+
+ std::error_code ParseValueSymbolTable();
+ std::error_code ParseConstants();
+ std::error_code RememberAndSkipFunctionBody();
+ /// Save the positions of the Metadata blocks and skip parsing the blocks.
+ std::error_code rememberAndSkipMetadata();
+ std::error_code ParseFunctionBody(Function *F);
+ std::error_code GlobalCleanup();
+ std::error_code ResolveGlobalAndAliasInits();
+ std::error_code ParseMetadata();
+ std::error_code ParseMetadataAttachment();
+ ErrorOr<std::string> parseModuleTriple();
+ std::error_code ParseUseLists();
+ std::error_code InitStream();
+ std::error_code InitStreamFromBuffer();
+ std::error_code InitLazyStream();
+ std::error_code FindFunctionInStream(
+ Function *F,
+ DenseMap<Function *, uint64_t>::iterator DeferredFunctionInfoIterator);
+};
+} // namespace
+
BitcodeDiagnosticInfo::BitcodeDiagnosticInfo(std::error_code EC,
DiagnosticSeverity Severity,
const Twine &Msg)
Removed: llvm/trunk/lib/Bitcode/Reader/BitcodeReader.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Bitcode/Reader/BitcodeReader.h?rev=232541&view=auto
==============================================================================
--- llvm/trunk/lib/Bitcode/Reader/BitcodeReader.h (original)
+++ llvm/trunk/lib/Bitcode/Reader/BitcodeReader.h (removed)
@@ -1,383 +0,0 @@
-//===- BitcodeReader.h - Internal BitcodeReader impl ------------*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This header defines the BitcodeReader class.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIB_BITCODE_READER_BITCODEREADER_H
-#define LLVM_LIB_BITCODE_READER_BITCODEREADER_H
-
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/Bitcode/BitstreamReader.h"
-#include "llvm/Bitcode/LLVMBitCodes.h"
-#include "llvm/IR/Attributes.h"
-#include "llvm/IR/GVMaterializer.h"
-#include "llvm/IR/Metadata.h"
-#include "llvm/IR/OperandTraits.h"
-#include "llvm/IR/TrackingMDRef.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/ValueHandle.h"
-#include <deque>
-#include <system_error>
-#include <vector>
-
-namespace llvm {
- class Comdat;
- class MemoryBuffer;
- class LLVMContext;
-
-//===----------------------------------------------------------------------===//
-// BitcodeReaderValueList Class
-//===----------------------------------------------------------------------===//
-
-class BitcodeReaderValueList {
- std::vector<WeakVH> ValuePtrs;
-
- /// ResolveConstants - As we resolve forward-referenced constants, we add
- /// information about them to this vector. This allows us to resolve them in
- /// bulk instead of resolving each reference at a time. See the code in
- /// ResolveConstantForwardRefs for more information about this.
- ///
- /// The key of this vector is the placeholder constant, the value is the slot
- /// number that holds the resolved value.
- typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy;
- ResolveConstantsTy ResolveConstants;
- LLVMContext &Context;
-public:
- BitcodeReaderValueList(LLVMContext &C) : Context(C) {}
- ~BitcodeReaderValueList() {
- assert(ResolveConstants.empty() && "Constants not resolved?");
- }
-
- // vector compatibility methods
- unsigned size() const { return ValuePtrs.size(); }
- void resize(unsigned N) { ValuePtrs.resize(N); }
- void push_back(Value *V) {
- ValuePtrs.push_back(V);
- }
-
- void clear() {
- assert(ResolveConstants.empty() && "Constants not resolved?");
- ValuePtrs.clear();
- }
-
- Value *operator[](unsigned i) const {
- assert(i < ValuePtrs.size());
- return ValuePtrs[i];
- }
-
- Value *back() const { return ValuePtrs.back(); }
- void pop_back() { ValuePtrs.pop_back(); }
- bool empty() const { return ValuePtrs.empty(); }
- void shrinkTo(unsigned N) {
- assert(N <= size() && "Invalid shrinkTo request!");
- ValuePtrs.resize(N);
- }
-
- Constant *getConstantFwdRef(unsigned Idx, Type *Ty);
- Value *getValueFwdRef(unsigned Idx, Type *Ty);
-
- void AssignValue(Value *V, unsigned Idx);
-
- /// ResolveConstantForwardRefs - Once all constants are read, this method bulk
- /// resolves any forward references.
- void ResolveConstantForwardRefs();
-};
-
-
-//===----------------------------------------------------------------------===//
-// BitcodeReaderMDValueList Class
-//===----------------------------------------------------------------------===//
-
-class BitcodeReaderMDValueList {
- unsigned NumFwdRefs;
- bool AnyFwdRefs;
- unsigned MinFwdRef;
- unsigned MaxFwdRef;
- std::vector<TrackingMDRef> MDValuePtrs;
-
- LLVMContext &Context;
-public:
- BitcodeReaderMDValueList(LLVMContext &C)
- : NumFwdRefs(0), AnyFwdRefs(false), Context(C) {}
-
- // vector compatibility methods
- unsigned size() const { return MDValuePtrs.size(); }
- void resize(unsigned N) { MDValuePtrs.resize(N); }
- void push_back(Metadata *MD) { MDValuePtrs.emplace_back(MD); }
- void clear() { MDValuePtrs.clear(); }
- Metadata *back() const { return MDValuePtrs.back(); }
- void pop_back() { MDValuePtrs.pop_back(); }
- bool empty() const { return MDValuePtrs.empty(); }
-
- Metadata *operator[](unsigned i) const {
- assert(i < MDValuePtrs.size());
- return MDValuePtrs[i];
- }
-
- void shrinkTo(unsigned N) {
- assert(N <= size() && "Invalid shrinkTo request!");
- MDValuePtrs.resize(N);
- }
-
- Metadata *getValueFwdRef(unsigned Idx);
- void AssignValue(Metadata *MD, unsigned Idx);
- void tryToResolveCycles();
-};
-
-class BitcodeReader : public GVMaterializer {
- LLVMContext &Context;
- DiagnosticHandlerFunction DiagnosticHandler;
- Module *TheModule;
- std::unique_ptr<MemoryBuffer> Buffer;
- std::unique_ptr<BitstreamReader> StreamFile;
- BitstreamCursor Stream;
- DataStreamer *LazyStreamer;
- uint64_t NextUnreadBit;
- bool SeenValueSymbolTable;
-
- std::vector<Type*> TypeList;
- BitcodeReaderValueList ValueList;
- BitcodeReaderMDValueList MDValueList;
- std::vector<Comdat *> ComdatList;
- SmallVector<Instruction *, 64> InstructionList;
-
- std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
- std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
- std::vector<std::pair<Function*, unsigned> > FunctionPrefixes;
- std::vector<std::pair<Function*, unsigned> > FunctionPrologues;
-
- SmallVector<Instruction*, 64> InstsWithTBAATag;
-
- /// MAttributes - The set of attributes by index. Index zero in the
- /// file is for null, and is thus not represented here. As such all indices
- /// are off by one.
- std::vector<AttributeSet> MAttributes;
-
- /// \brief The set of attribute groups.
- std::map<unsigned, AttributeSet> MAttributeGroups;
-
- /// FunctionBBs - While parsing a function body, this is a list of the basic
- /// blocks for the function.
- std::vector<BasicBlock*> FunctionBBs;
-
- // When reading the module header, this list is populated with functions that
- // have bodies later in the file.
- std::vector<Function*> FunctionsWithBodies;
-
- // When intrinsic functions are encountered which require upgrading they are
- // stored here with their replacement function.
- typedef std::vector<std::pair<Function*, Function*> > UpgradedIntrinsicMap;
- UpgradedIntrinsicMap UpgradedIntrinsics;
-
- // Map the bitcode's custom MDKind ID to the Module's MDKind ID.
- DenseMap<unsigned, unsigned> MDKindMap;
-
- // Several operations happen after the module header has been read, but
- // before function bodies are processed. This keeps track of whether
- // we've done this yet.
- bool SeenFirstFunctionBody;
-
- /// DeferredFunctionInfo - When function bodies are initially scanned, this
- /// map contains info about where to find deferred function body in the
- /// stream.
- DenseMap<Function*, uint64_t> DeferredFunctionInfo;
-
- /// When Metadata block is initially scanned when parsing the module, we may
- /// choose to defer parsing of the metadata. This vector contains info about
- /// which Metadata blocks are deferred.
- std::vector<uint64_t> DeferredMetadataInfo;
-
- /// These are basic blocks forward-referenced by block addresses. They are
- /// inserted lazily into functions when they're loaded. The basic block ID is
- /// its index into the vector.
- DenseMap<Function *, std::vector<BasicBlock *>> BasicBlockFwdRefs;
- std::deque<Function *> BasicBlockFwdRefQueue;
-
- /// UseRelativeIDs - Indicates that we are using a new encoding for
- /// instruction operands where most operands in the current
- /// FUNCTION_BLOCK are encoded relative to the instruction number,
- /// for a more compact encoding. Some instruction operands are not
- /// relative to the instruction ID: basic block numbers, and types.
- /// Once the old style function blocks have been phased out, we would
- /// not need this flag.
- bool UseRelativeIDs;
-
- /// True if all functions will be materialized, negating the need to process
- /// (e.g.) blockaddress forward references.
- bool WillMaterializeAllForwardRefs;
-
- /// Functions that have block addresses taken. This is usually empty.
- SmallPtrSet<const Function *, 4> BlockAddressesTaken;
-
- /// True if any Metadata block has been materialized.
- bool IsMetadataMaterialized;
-
-public:
- std::error_code Error(BitcodeError E, const Twine &Message);
- std::error_code Error(BitcodeError E);
- std::error_code Error(const Twine &Message);
-
- explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext &C,
- DiagnosticHandlerFunction DiagnosticHandler);
- explicit BitcodeReader(DataStreamer *streamer, LLVMContext &C,
- DiagnosticHandlerFunction DiagnosticHandler);
- ~BitcodeReader() { FreeState(); }
-
- std::error_code materializeForwardReferencedFunctions();
-
- void FreeState();
-
- void releaseBuffer();
-
- bool isDematerializable(const GlobalValue *GV) const override;
- std::error_code materialize(GlobalValue *GV) override;
- std::error_code MaterializeModule(Module *M) override;
- std::vector<StructType *> getIdentifiedStructTypes() const override;
- void Dematerialize(GlobalValue *GV) override;
-
- /// @brief Main interface to parsing a bitcode buffer.
- /// @returns true if an error occurred.
- std::error_code ParseBitcodeInto(Module *M,
- bool ShouldLazyLoadMetadata = false);
-
- /// @brief Cheap mechanism to just extract module triple
- /// @returns true if an error occurred.
- ErrorOr<std::string> parseTriple();
-
- static uint64_t decodeSignRotatedValue(uint64_t V);
-
- /// Materialize any deferred Metadata block.
- std::error_code materializeMetadata() override;
-
-private:
- std::vector<StructType *> IdentifiedStructTypes;
- StructType *createIdentifiedStructType(LLVMContext &Context, StringRef Name);
- StructType *createIdentifiedStructType(LLVMContext &Context);
-
- Type *getTypeByID(unsigned ID);
- Value *getFnValueByID(unsigned ID, Type *Ty) {
- if (Ty && Ty->isMetadataTy())
- return MetadataAsValue::get(Ty->getContext(), getFnMetadataByID(ID));
- return ValueList.getValueFwdRef(ID, Ty);
- }
- Metadata *getFnMetadataByID(unsigned ID) {
- return MDValueList.getValueFwdRef(ID);
- }
- BasicBlock *getBasicBlock(unsigned ID) const {
- if (ID >= FunctionBBs.size()) return nullptr; // Invalid ID
- return FunctionBBs[ID];
- }
- AttributeSet getAttributes(unsigned i) const {
- if (i-1 < MAttributes.size())
- return MAttributes[i-1];
- return AttributeSet();
- }
-
- /// getValueTypePair - Read a value/type pair out of the specified record from
- /// slot 'Slot'. Increment Slot past the number of slots used in the record.
- /// Return true on failure.
- bool getValueTypePair(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
- unsigned InstNum, Value *&ResVal) {
- if (Slot == Record.size()) return true;
- unsigned ValNo = (unsigned)Record[Slot++];
- // Adjust the ValNo, if it was encoded relative to the InstNum.
- if (UseRelativeIDs)
- ValNo = InstNum - ValNo;
- if (ValNo < InstNum) {
- // If this is not a forward reference, just return the value we already
- // have.
- ResVal = getFnValueByID(ValNo, nullptr);
- return ResVal == nullptr;
- } else if (Slot == Record.size()) {
- return true;
- }
-
- unsigned TypeNo = (unsigned)Record[Slot++];
- ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo));
- return ResVal == nullptr;
- }
-
- /// popValue - Read a value out of the specified record from slot 'Slot'.
- /// Increment Slot past the number of slots used by the value in the record.
- /// Return true if there is an error.
- bool popValue(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
- unsigned InstNum, Type *Ty, Value *&ResVal) {
- if (getValue(Record, Slot, InstNum, Ty, ResVal))
- return true;
- // All values currently take a single record slot.
- ++Slot;
- return false;
- }
-
- /// getValue -- Like popValue, but does not increment the Slot number.
- bool getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
- unsigned InstNum, Type *Ty, Value *&ResVal) {
- ResVal = getValue(Record, Slot, InstNum, Ty);
- return ResVal == nullptr;
- }
-
- /// getValue -- Version of getValue that returns ResVal directly,
- /// or 0 if there is an error.
- Value *getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
- unsigned InstNum, Type *Ty) {
- if (Slot == Record.size()) return nullptr;
- unsigned ValNo = (unsigned)Record[Slot];
- // Adjust the ValNo, if it was encoded relative to the InstNum.
- if (UseRelativeIDs)
- ValNo = InstNum - ValNo;
- return getFnValueByID(ValNo, Ty);
- }
-
- /// getValueSigned -- Like getValue, but decodes signed VBRs.
- Value *getValueSigned(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
- unsigned InstNum, Type *Ty) {
- if (Slot == Record.size()) return nullptr;
- unsigned ValNo = (unsigned)decodeSignRotatedValue(Record[Slot]);
- // Adjust the ValNo, if it was encoded relative to the InstNum.
- if (UseRelativeIDs)
- ValNo = InstNum - ValNo;
- return getFnValueByID(ValNo, Ty);
- }
-
- /// Converts alignment exponent (i.e. power of two (or zero)) to the
- /// corresponding alignment to use. If alignment is too large, returns
- /// a corresponding error code.
- std::error_code parseAlignmentValue(uint64_t Exponent, unsigned &Alignment);
- std::error_code ParseAttrKind(uint64_t Code, Attribute::AttrKind *Kind);
- std::error_code ParseModule(bool Resume, bool ShouldLazyLoadMetadata = false);
- std::error_code ParseAttributeBlock();
- std::error_code ParseAttributeGroupBlock();
- std::error_code ParseTypeTable();
- std::error_code ParseTypeTableBody();
-
- std::error_code ParseValueSymbolTable();
- std::error_code ParseConstants();
- std::error_code RememberAndSkipFunctionBody();
- /// Save the positions of the Metadata blocks and skip parsing the blocks.
- std::error_code rememberAndSkipMetadata();
- std::error_code ParseFunctionBody(Function *F);
- std::error_code GlobalCleanup();
- std::error_code ResolveGlobalAndAliasInits();
- std::error_code ParseMetadata();
- std::error_code ParseMetadataAttachment();
- ErrorOr<std::string> parseModuleTriple();
- std::error_code ParseUseLists();
- std::error_code InitStream();
- std::error_code InitStreamFromBuffer();
- std::error_code InitLazyStream();
- std::error_code FindFunctionInStream(
- Function *F,
- DenseMap<Function *, uint64_t>::iterator DeferredFunctionInfoIterator);
-};
-
-} // End llvm namespace
-
-#endif
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