//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#define BITCODE_READER_H
#include "llvm/ModuleProvider.h"
+#include "llvm/Attributes.h"
#include "llvm/Type.h"
-#include "llvm/User.h"
+#include "llvm/OperandTraits.h"
+#include "llvm/Bitcode/BitstreamReader.h"
#include "llvm/Bitcode/LLVMBitCodes.h"
+#include "llvm/Support/ValueHandle.h"
+#include "llvm/ADT/DenseMap.h"
#include <vector>
namespace llvm {
- class BitstreamReader;
+ class MemoryBuffer;
+ class LLVMContext;
-class BitcodeReaderValueList : public User {
- std::vector<Use> Uses;
-public:
- BitcodeReaderValueList() : User(Type::VoidTy, Value::ArgumentVal, 0, 0) {}
+//===----------------------------------------------------------------------===//
+// 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;
+public:
+ BitcodeReaderValueList() {}
+ ~BitcodeReaderValueList() {
+ assert(ResolveConstants.empty() && "Constants not resolved?");
+ }
+
// vector compatibility methods
- unsigned size() const { return getNumOperands(); }
+ unsigned size() const { return ValuePtrs.size(); }
+ void resize(unsigned N) { ValuePtrs.resize(N); }
void push_back(Value *V) {
- Uses.push_back(Use(V, this));
- OperandList = &Uses[0];
- ++NumOperands;
+ ValuePtrs.push_back(V);
+ }
+
+ void clear() {
+ assert(ResolveConstants.empty() && "Constants not resolved?");
+ ValuePtrs.clear();
}
- Value *operator[](unsigned i) const { return getOperand(i); }
+ Value *operator[](unsigned i) const {
+ assert(i < ValuePtrs.size());
+ return ValuePtrs[i];
+ }
- Value *back() const { return Uses.back(); }
- void pop_back() { Uses.pop_back(); --NumOperands; }
- bool empty() const { return NumOperands == 0; }
+ Value *back() const { return ValuePtrs.back(); }
+ void pop_back() { ValuePtrs.pop_back(); }
+ bool empty() const { return ValuePtrs.empty(); }
void shrinkTo(unsigned N) {
- assert(N < NumOperands && "Invalid shrinkTo request!");
- Uses.resize(N);
- NumOperands = N;
+ assert(N <= size() && "Invalid shrinkTo request!");
+ ValuePtrs.resize(N);
}
- virtual void print(std::ostream&) const {}
Constant *getConstantFwdRef(unsigned Idx, const Type *Ty);
- void initVal(unsigned Idx, Value *V) {
- assert(Uses[Idx] == 0 && "Cannot init an already init'd Use!");
- Uses[Idx].init(V, this);
- }
-};
+ Value *getValueFwdRef(unsigned Idx, const Type *Ty);
+ void AssignValue(Value *V, unsigned Idx);
+
+ /// ResolveConstantForwardRefs - Once all constants are read, this method bulk
+ /// resolves any forward references.
+ void ResolveConstantForwardRefs();
+};
class BitcodeReader : public ModuleProvider {
+ LLVMContext* Context;
+ MemoryBuffer *Buffer;
+ BitstreamReader StreamFile;
+ BitstreamCursor Stream;
+
const char *ErrorString;
std::vector<PATypeHolder> TypeList;
BitcodeReaderValueList ValueList;
std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
-public:
- BitcodeReader() : ErrorString(0) {}
- virtual ~BitcodeReader() {}
- virtual void FreeState() {}
+ /// 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<AttrListPtr> MAttributes;
- virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) {
- // FIXME: TODO
- return false;
+ /// 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;
+
+ // After the module header has been read, the FunctionsWithBodies list is
+ // reversed. This keeps track of whether we've done this yet.
+ bool HasReversedFunctionsWithBodies;
+
+ /// DeferredFunctionInfo - When function bodies are initially scanned, this
+ /// map contains info about where to find deferred function body (in the
+ /// stream) and what linkage the original function had.
+ DenseMap<Function*, std::pair<uint64_t, unsigned> > DeferredFunctionInfo;
+public:
+ explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext* C)
+ : Context(C), Buffer(buffer), ErrorString(0) {
+ HasReversedFunctionsWithBodies = false;
+ }
+ ~BitcodeReader() {
+ FreeState();
}
- virtual Module *materializeModule(std::string *ErrInfo = 0) {
- // FIXME: TODO
- //if (ParseAllFunctionBodies(ErrMsg))
- // return 0;
- return TheModule;
+ void FreeState();
+
+ /// releaseMemoryBuffer - This causes the reader to completely forget about
+ /// the memory buffer it contains, which prevents the buffer from being
+ /// destroyed when it is deleted.
+ void releaseMemoryBuffer() {
+ Buffer = 0;
}
+ virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0);
+ virtual Module *materializeModule(std::string *ErrInfo = 0);
+ virtual void dematerializeFunction(Function *F);
+ virtual Module *releaseModule(std::string *ErrInfo = 0);
+
bool Error(const char *Str) {
ErrorString = Str;
return true;
/// @brief Main interface to parsing a bitcode buffer.
/// @returns true if an error occurred.
- bool ParseBitcode(unsigned char *Buf, unsigned Length,
- const std::string &ModuleID);
+ bool ParseBitcode();
private:
const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
+ Value *getFnValueByID(unsigned ID, const Type *Ty) {
+ return ValueList.getValueFwdRef(ID, Ty);
+ }
+ BasicBlock *getBasicBlock(unsigned ID) const {
+ if (ID >= FunctionBBs.size()) return 0; // Invalid ID
+ return FunctionBBs[ID];
+ }
+ AttrListPtr getAttributes(unsigned i) const {
+ if (i-1 < MAttributes.size())
+ return MAttributes[i-1];
+ return AttrListPtr();
+ }
+
+ /// 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(SmallVector<uint64_t, 64> &Record, unsigned &Slot,
+ unsigned InstNum, Value *&ResVal) {
+ if (Slot == Record.size()) return true;
+ unsigned ValNo = (unsigned)Record[Slot++];
+ if (ValNo < InstNum) {
+ // If this is not a forward reference, just return the value we already
+ // have.
+ ResVal = getFnValueByID(ValNo, 0);
+ return ResVal == 0;
+ } else if (Slot == Record.size()) {
+ return true;
+ }
+
+ unsigned TypeNo = (unsigned)Record[Slot++];
+ ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo));
+ return ResVal == 0;
+ }
+ bool getValue(SmallVector<uint64_t, 64> &Record, unsigned &Slot,
+ const Type *Ty, Value *&ResVal) {
+ if (Slot == Record.size()) return true;
+ unsigned ValNo = (unsigned)Record[Slot++];
+ ResVal = getFnValueByID(ValNo, Ty);
+ return ResVal == 0;
+ }
+
- bool ParseModule(BitstreamReader &Stream, const std::string &ModuleID);
- bool ParseTypeTable(BitstreamReader &Stream);
- bool ParseTypeSymbolTable(BitstreamReader &Stream);
- bool ParseValueSymbolTable(BitstreamReader &Stream);
- bool ParseConstants(BitstreamReader &Stream);
+ bool ParseModule(const std::string &ModuleID);
+ bool ParseAttributeBlock();
+ bool ParseTypeTable();
+ bool ParseTypeSymbolTable();
+ bool ParseValueSymbolTable();
+ bool ParseConstants();
+ bool RememberAndSkipFunctionBody();
+ bool ParseFunctionBody(Function *F);
bool ResolveGlobalAndAliasInits();
};
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