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Initial support for reading bitcode files. They currently only read types,
the type symtab, and global/function protos, and are missing the important size optimization, but it is a place to start. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36330 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
b35ca9db9c
commit
caee0dccff
455
lib/Bitcode/Reader/BitcodeReader.cpp
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455
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -0,0 +1,455 @@
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//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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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#include "BitcodeReader.h"
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#include "llvm/Bitcode/BitstreamReader.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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using namespace llvm;
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/// ConvertToString - Convert a string from a record into an std::string, return
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/// true on failure.
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static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx,
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std::string &Result) {
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if (Record.size() < Idx+1 || Record.size() < Record[Idx]+Idx+1)
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return true;
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for (unsigned i = 0, e = Record[Idx]; i != e; ++i)
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Result += (char)Record[Idx+i+1];
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return false;
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}
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static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
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switch (Val) {
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default: // Map unknown/new linkages to external
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case 0: return GlobalValue::ExternalLinkage;
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case 1: return GlobalValue::WeakLinkage;
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case 2: return GlobalValue::AppendingLinkage;
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case 3: return GlobalValue::InternalLinkage;
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case 4: return GlobalValue::LinkOnceLinkage;
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case 5: return GlobalValue::DLLImportLinkage;
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case 6: return GlobalValue::DLLExportLinkage;
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case 7: return GlobalValue::ExternalWeakLinkage;
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}
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}
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static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) {
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switch (Val) {
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default: // Map unknown visibilities to default.
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case 0: return GlobalValue::DefaultVisibility;
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case 1: return GlobalValue::HiddenVisibility;
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}
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}
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const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) {
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// If the TypeID is in range, return it.
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if (ID < TypeList.size())
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return TypeList[ID].get();
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if (!isTypeTable) return 0;
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// The type table allows forward references. Push as many Opaque types as
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// needed to get up to ID.
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while (TypeList.size() <= ID)
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TypeList.push_back(OpaqueType::get());
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return TypeList.back().get();
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}
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bool BitcodeReader::ParseTypeTable(BitstreamReader &Stream) {
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if (Stream.EnterSubBlock())
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return Error("Malformed block record");
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if (!TypeList.empty())
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return Error("Multiple TYPE_BLOCKs found!");
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SmallVector<uint64_t, 64> Record;
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unsigned NumRecords = 0;
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// Read all the records for this type table.
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while (1) {
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unsigned Code = Stream.ReadCode();
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if (Code == bitc::END_BLOCK) {
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if (NumRecords != TypeList.size())
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return Error("Invalid type forward reference in TYPE_BLOCK");
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return Stream.ReadBlockEnd();
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}
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if (Code == bitc::ENTER_SUBBLOCK) {
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// No known subblocks, always skip them.
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Stream.ReadSubBlockID();
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if (Stream.SkipBlock())
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return Error("Malformed block record");
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continue;
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}
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if (Code == bitc::DEFINE_ABBREVS) {
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assert(0 && "Abbrevs not implemented yet!");
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}
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// Read a record.
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Record.clear();
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const Type *ResultTy = 0;
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switch (Stream.ReadRecord(Code, Record)) {
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default: // Default behavior: unknown type.
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ResultTy = 0;
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break;
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case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries]
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// TYPE_CODE_NUMENTRY contains a count of the number of types in the
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// type list. This allows us to reserve space.
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if (Record.size() < 1)
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return Error("Invalid TYPE_CODE_NUMENTRY record");
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TypeList.reserve(Record[0]);
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continue;
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case bitc::TYPE_CODE_META: // TYPE_CODE_META: [metacode]...
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// No metadata supported yet.
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if (Record.size() < 1)
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return Error("Invalid TYPE_CODE_META record");
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continue;
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case bitc::TYPE_CODE_VOID: // VOID
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ResultTy = Type::VoidTy;
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break;
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case bitc::TYPE_CODE_FLOAT: // FLOAT
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ResultTy = Type::FloatTy;
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break;
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case bitc::TYPE_CODE_DOUBLE: // DOUBLE
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ResultTy = Type::DoubleTy;
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break;
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case bitc::TYPE_CODE_LABEL: // LABEL
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ResultTy = Type::LabelTy;
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break;
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case bitc::TYPE_CODE_OPAQUE: // OPAQUE
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ResultTy = 0;
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break;
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case bitc::TYPE_CODE_INTEGER: // INTEGER: [width]
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if (Record.size() < 1)
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return Error("Invalid Integer type record");
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ResultTy = IntegerType::get(Record[0]);
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break;
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case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type]
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if (Record.size() < 1)
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return Error("Invalid POINTER type record");
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ResultTy = PointerType::get(getTypeByID(Record[0], true));
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break;
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case bitc::TYPE_CODE_FUNCTION: {
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// FUNCTION: [vararg, retty, #pararms, paramty N]
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if (Record.size() < 3 || Record.size() < Record[2]+3)
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return Error("Invalid FUNCTION type record");
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std::vector<const Type*> ArgTys;
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for (unsigned i = 0, e = Record[2]; i != e; ++i)
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ArgTys.push_back(getTypeByID(Record[3+i], true));
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// FIXME: PARAM TYS.
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ResultTy = FunctionType::get(getTypeByID(Record[1], true), ArgTys,
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Record[0]);
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break;
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}
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case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, #elts, eltty x N]
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if (Record.size() < 2 || Record.size() < Record[1]+2)
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return Error("Invalid STRUCT type record");
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std::vector<const Type*> EltTys;
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for (unsigned i = 0, e = Record[1]; i != e; ++i)
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EltTys.push_back(getTypeByID(Record[2+i], true));
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ResultTy = StructType::get(EltTys, Record[0]);
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break;
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}
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case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty]
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if (Record.size() < 2)
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return Error("Invalid ARRAY type record");
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ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]);
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break;
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case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
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if (Record.size() < 2)
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return Error("Invalid VECTOR type record");
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ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]);
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break;
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}
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if (NumRecords == TypeList.size()) {
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// If this is a new type slot, just append it.
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TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get());
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++NumRecords;
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} else if (ResultTy == 0) {
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// Otherwise, this was forward referenced, so an opaque type was created,
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// but the result type is actually just an opaque. Leave the one we
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// created previously.
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++NumRecords;
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} else {
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// Otherwise, this was forward referenced, so an opaque type was created.
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// Resolve the opaque type to the real type now.
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assert(NumRecords < TypeList.size() && "Typelist imbalance");
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const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get());
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// Don't directly push the new type on the Tab. Instead we want to replace
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// the opaque type we previously inserted with the new concrete value. The
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// refinement from the abstract (opaque) type to the new type causes all
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// uses of the abstract type to use the concrete type (NewTy). This will
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// also cause the opaque type to be deleted.
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const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy);
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// This should have replaced the old opaque type with the new type in the
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// value table... or with a preexisting type that was already in the system.
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// Let's just make sure it did.
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assert(TypeList[NumRecords-1].get() != OldTy &&
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"refineAbstractType didn't work!");
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}
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}
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}
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bool BitcodeReader::ParseTypeSymbolTable(BitstreamReader &Stream) {
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if (Stream.EnterSubBlock())
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return Error("Malformed block record");
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SmallVector<uint64_t, 64> Record;
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// Read all the records for this type table.
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std::string TypeName;
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while (1) {
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unsigned Code = Stream.ReadCode();
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if (Code == bitc::END_BLOCK)
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return Stream.ReadBlockEnd();
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if (Code == bitc::ENTER_SUBBLOCK) {
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// No known subblocks, always skip them.
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Stream.ReadSubBlockID();
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if (Stream.SkipBlock())
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return Error("Malformed block record");
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continue;
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}
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if (Code == bitc::DEFINE_ABBREVS) {
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assert(0 && "Abbrevs not implemented yet!");
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}
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// Read a record.
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Record.clear();
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switch (Stream.ReadRecord(Code, Record)) {
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default: // Default behavior: unknown type.
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break;
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case bitc::TST_ENTRY_CODE: // TST_ENTRY: [typeid, namelen, namechar x N]
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if (ConvertToString(Record, 1, TypeName))
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return Error("Invalid TST_ENTRY record");
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unsigned TypeID = Record[0];
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if (TypeID >= TypeList.size())
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return Error("Invalid Type ID in TST_ENTRY record");
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TheModule->addTypeName(TypeName, TypeList[TypeID].get());
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TypeName.clear();
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break;
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}
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}
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}
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bool BitcodeReader::ParseModule(BitstreamReader &Stream,
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const std::string &ModuleID) {
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// Reject multiple MODULE_BLOCK's in a single bitstream.
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if (TheModule)
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return Error("Multiple MODULE_BLOCKs in same stream");
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if (Stream.EnterSubBlock())
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return Error("Malformed block record");
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// Otherwise, create the module.
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TheModule = new Module(ModuleID);
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SmallVector<uint64_t, 64> Record;
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std::vector<std::string> SectionTable;
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// Read all the records for this module.
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while (!Stream.AtEndOfStream()) {
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unsigned Code = Stream.ReadCode();
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if (Code == bitc::END_BLOCK)
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return Stream.ReadBlockEnd();
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if (Code == bitc::ENTER_SUBBLOCK) {
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switch (Stream.ReadSubBlockID()) {
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default: // Skip unknown content.
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if (Stream.SkipBlock())
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return Error("Malformed block record");
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break;
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case bitc::TYPE_BLOCK_ID:
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if (ParseTypeTable(Stream))
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return true;
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break;
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case bitc::TYPE_SYMTAB_BLOCK_ID:
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if (ParseTypeSymbolTable(Stream))
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return true;
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break;
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}
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continue;
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}
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if (Code == bitc::DEFINE_ABBREVS) {
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assert(0 && "Abbrevs not implemented yet!");
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}
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// Read a record.
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switch (Stream.ReadRecord(Code, Record)) {
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default: break; // Default behavior, ignore unknown content.
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case bitc::MODULE_CODE_VERSION: // VERSION: [version#]
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if (Record.size() < 1)
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return Error("Malformed MODULE_CODE_VERSION");
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// Only version #0 is supported so far.
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if (Record[0] != 0)
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return Error("Unknown bitstream version!");
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break;
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case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strlen, strchr x N]
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std::string S;
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if (ConvertToString(Record, 0, S))
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return Error("Invalid MODULE_CODE_TRIPLE record");
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TheModule->setTargetTriple(S);
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break;
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}
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case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strlen, strchr x N]
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std::string S;
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if (ConvertToString(Record, 0, S))
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return Error("Invalid MODULE_CODE_DATALAYOUT record");
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TheModule->setDataLayout(S);
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break;
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}
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case bitc::MODULE_CODE_ASM: { // ASM: [strlen, strchr x N]
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std::string S;
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if (ConvertToString(Record, 0, S))
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return Error("Invalid MODULE_CODE_ASM record");
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TheModule->setModuleInlineAsm(S);
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break;
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}
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case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strlen, strchr x N]
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std::string S;
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if (ConvertToString(Record, 0, S))
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return Error("Invalid MODULE_CODE_DEPLIB record");
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TheModule->addLibrary(S);
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break;
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}
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case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strlen, strchr x N]
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std::string S;
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if (ConvertToString(Record, 0, S))
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return Error("Invalid MODULE_CODE_SECTIONNAME record");
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SectionTable.push_back(S);
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break;
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}
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// GLOBALVAR: [type, isconst, initid,
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// linkage, alignment, section, visibility, threadlocal]
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case bitc::MODULE_CODE_GLOBALVAR: {
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if (Record.size() < 8)
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return Error("Invalid MODULE_CODE_GLOBALVAR record");
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const Type *Ty = getTypeByID(Record[0]);
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if (!isa<PointerType>(Ty))
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return Error("Global not a pointer type!");
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Ty = cast<PointerType>(Ty)->getElementType();
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bool isConstant = Record[1];
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GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]);
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unsigned Alignment = (1 << Record[4]) >> 1;
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std::string Section;
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if (Record[5]) {
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if (Record[5]-1 >= SectionTable.size())
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return Error("Invalid section ID");
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Section = SectionTable[Record[5]-1];
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}
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GlobalValue::VisibilityTypes Visibility = GetDecodedVisibility(Record[6]);
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bool isThreadLocal = Record[7];
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GlobalVariable *NewGV =
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new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule);
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NewGV->setAlignment(Alignment);
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if (!Section.empty())
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NewGV->setSection(Section);
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NewGV->setVisibility(Visibility);
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NewGV->setThreadLocal(isThreadLocal);
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// TODO: Add to value table.
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// TODO: remember initializer/global pair for later substitution.
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break;
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}
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// FUNCTION: [type, callingconv, isproto, linkage, alignment, section,
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// visibility]
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case bitc::MODULE_CODE_FUNCTION: {
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if (Record.size() < 7)
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return Error("Invalid MODULE_CODE_FUNCTION record");
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const Type *Ty = getTypeByID(Record[0]);
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if (!isa<PointerType>(Ty))
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return Error("Function not a pointer type!");
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const FunctionType *FTy =
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dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
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if (!FTy)
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return Error("Function not a pointer to function type!");
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Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
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"", TheModule);
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Func->setCallingConv(Record[1]);
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Func->setLinkage(GetDecodedLinkage(Record[3]));
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Func->setAlignment((1 << Record[4]) >> 1);
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if (Record[5]) {
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if (Record[5]-1 >= SectionTable.size())
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return Error("Invalid section ID");
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Func->setSection(SectionTable[Record[5]-1]);
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}
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Func->setVisibility(GetDecodedVisibility(Record[6]));
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// TODO: Add to value table.
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// TODO: remember initializer/global pair for later substitution.
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break;
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}
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}
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Record.clear();
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}
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return Error("Premature end of bitstream");
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}
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bool BitcodeReader::ParseBitcode(unsigned char *Buf, unsigned Length,
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const std::string &ModuleID) {
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TheModule = 0;
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if (Length & 3)
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return Error("Bitcode stream should be a multiple of 4 bytes in length");
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BitstreamReader Stream(Buf, Buf+Length);
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// Sniff for the signature.
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if (Stream.Read(8) != 'B' ||
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Stream.Read(8) != 'C' ||
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Stream.Read(4) != 0x0 ||
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Stream.Read(4) != 0xC ||
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Stream.Read(4) != 0xE ||
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Stream.Read(4) != 0xD)
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return Error("Invalid bitcode signature");
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// We expect a number of well-defined blocks, though we don't necessarily
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// need to understand them all.
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while (!Stream.AtEndOfStream()) {
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unsigned Code = Stream.ReadCode();
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if (Code != bitc::ENTER_SUBBLOCK)
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return Error("Invalid record at top-level");
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unsigned BlockID = Stream.ReadSubBlockID();
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// We only know the MODULE subblock ID.
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if (BlockID == bitc::MODULE_BLOCK_ID) {
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if (ParseModule(Stream, ModuleID))
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return true;
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} else if (Stream.SkipBlock()) {
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return Error("Malformed block record");
|
||||
}
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}
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return false;
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}
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66
lib/Bitcode/Reader/BitcodeReader.h
Normal file
66
lib/Bitcode/Reader/BitcodeReader.h
Normal file
@ -0,0 +1,66 @@
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//===- 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 was developed by Chris Lattner and is distributed under
|
||||
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This header defines the BitcodeReader class.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#ifndef BITCODE_READER_H
|
||||
#define BITCODE_READER_H
|
||||
|
||||
#include "llvm/AbstractTypeUser.h"
|
||||
#include "llvm/ModuleProvider.h"
|
||||
#include "../LLVMBitCodes.h"
|
||||
#include <vector>
|
||||
|
||||
namespace llvm {
|
||||
class BitstreamReader;
|
||||
|
||||
class BitcodeReader : public ModuleProvider {
|
||||
const char *ErrorString;
|
||||
|
||||
std::vector<PATypeHolder> TypeList;
|
||||
public:
|
||||
virtual ~BitcodeReader() {}
|
||||
|
||||
virtual void FreeState() {}
|
||||
|
||||
virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) {
|
||||
// FIXME: TODO
|
||||
return false;
|
||||
}
|
||||
|
||||
virtual Module *materializeModule(std::string *ErrInfo = 0) {
|
||||
// FIXME: TODO
|
||||
//if (ParseAllFunctionBodies(ErrMsg))
|
||||
// return 0;
|
||||
return TheModule;
|
||||
}
|
||||
|
||||
bool Error(const char *Str) {
|
||||
ErrorString = Str;
|
||||
return true;
|
||||
}
|
||||
const char *getErrorString() const { return ErrorString; }
|
||||
|
||||
/// @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);
|
||||
private:
|
||||
const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
|
||||
|
||||
bool ParseModule(BitstreamReader &Stream, const std::string &ModuleID);
|
||||
bool ParseTypeTable(BitstreamReader &Stream);
|
||||
bool ParseTypeSymbolTable(BitstreamReader &Stream);
|
||||
};
|
||||
|
||||
} // End llvm namespace
|
||||
|
||||
#endif
|
||||
15
lib/Bitcode/Reader/Makefile
Normal file
15
lib/Bitcode/Reader/Makefile
Normal file
@ -0,0 +1,15 @@
|
||||
##===- lib/Bitcode/Reader/Makefile -------------------------*- Makefile -*-===##
|
||||
#
|
||||
# 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.
|
||||
#
|
||||
##===----------------------------------------------------------------------===##
|
||||
|
||||
LEVEL = ../../..
|
||||
LIBRARYNAME = LLVMBitReader
|
||||
BUILD_ARCHIVE = 1
|
||||
|
||||
include $(LEVEL)/Makefile.common
|
||||
|
||||
97
lib/Bitcode/Reader/ReaderWrappers.cpp
Normal file
97
lib/Bitcode/Reader/ReaderWrappers.cpp
Normal file
@ -0,0 +1,97 @@
|
||||
//===- ReaderWrappers.cpp - Parse bitcode from file or buffer -------------===//
|
||||
//
|
||||
// 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 implements loading and parsing a bitcode file and parsing a
|
||||
// module from a memory buffer.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/Bitcode/ReaderWriter.h"
|
||||
#include "BitcodeReader.h"
|
||||
#include "llvm/System/MappedFile.h"
|
||||
using namespace llvm;
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// BitcodeFileReader - Read from an mmap'able file descriptor.
|
||||
|
||||
namespace {
|
||||
/// BitcodeFileReader - parses bitcode from a file.
|
||||
///
|
||||
class BitcodeFileReader : public BitcodeReader {
|
||||
private:
|
||||
std::string Filename;
|
||||
sys::MappedFile File;
|
||||
|
||||
BitcodeFileReader(const BitcodeFileReader&); // DO NOT IMPLEMENT
|
||||
void operator=(const BitcodeFileReader&); // DO NOT IMPLEMENT
|
||||
public:
|
||||
BitcodeFileReader(const std::string &FN) : Filename(FN) {}
|
||||
bool Read(std::string *ErrMsg);
|
||||
|
||||
void FreeState() {
|
||||
BitcodeReader::FreeState();
|
||||
File.close();
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
bool BitcodeFileReader::Read(std::string *ErrMsg) {
|
||||
if (File.open(sys::Path(Filename), sys::MappedFile::READ_ACCESS, ErrMsg))
|
||||
return true;
|
||||
if (!File.map(ErrMsg)) {
|
||||
File.close();
|
||||
return true;
|
||||
}
|
||||
unsigned char *Buffer = reinterpret_cast<unsigned char*>(File.base());
|
||||
if (!ParseBitcode(Buffer, File.size(), Filename))
|
||||
return false;
|
||||
if (ErrMsg) *ErrMsg = getErrorString();
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// External interface
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file.
|
||||
///
|
||||
ModuleProvider *llvm::getBitcodeModuleProvider(const std::string &Filename,
|
||||
std::string *ErrMsg) {
|
||||
if (Filename != std::string("-")) {
|
||||
BitcodeFileReader *R = new BitcodeFileReader(Filename);
|
||||
if (R->Read(ErrMsg)) {
|
||||
delete R;
|
||||
return 0;
|
||||
}
|
||||
return R;
|
||||
}
|
||||
|
||||
assert(0 && "FIXME: stdin reading unimp!");
|
||||
#if 0
|
||||
// Read from stdin
|
||||
BytecodeStdinReader *R = new BytecodeStdinReader();
|
||||
if (R->Read(ErrMsg)) {
|
||||
delete R;
|
||||
return 0;
|
||||
}
|
||||
return R;
|
||||
#endif
|
||||
}
|
||||
|
||||
/// ParseBitcodeFile - Read the specified bitcode file, returning the module.
|
||||
/// If an error occurs, return null and fill in *ErrMsg if non-null.
|
||||
Module *llvm::ParseBitcodeFile(const std::string &Filename,std::string *ErrMsg){
|
||||
ModuleProvider *MP = getBitcodeModuleProvider(Filename, ErrMsg);
|
||||
if (!MP) return 0;
|
||||
Module *M = MP->releaseModule(ErrMsg);
|
||||
delete MP;
|
||||
return M;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user