mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 17:29:19 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36384 91177308-0d34-0410-b5e6-96231b3b80d8
499 lines
18 KiB
C++
499 lines
18 KiB
C++
//===--- Bitcode/Writer/Writer.cpp - Bitcode Writer -----------------------===//
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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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// Bitcode writer implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Bitcode/BitstreamWriter.h"
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#include "llvm/Bitcode/LLVMBitCodes.h"
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#include "ValueEnumerator.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/TypeSymbolTable.h"
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#include "llvm/ValueSymbolTable.h"
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#include "llvm/Support/MathExtras.h"
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using namespace llvm;
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static const unsigned CurVersion = 0;
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static void WriteStringRecord(unsigned Code, const std::string &Str,
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unsigned AbbrevToUse, BitstreamWriter &Stream) {
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SmallVector<unsigned, 64> Vals;
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// Code: [strlen, strchar x N]
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Vals.push_back(Str.size());
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for (unsigned i = 0, e = Str.size(); i != e; ++i)
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Vals.push_back(Str[i]);
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// Emit the finished record.
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Stream.EmitRecord(Code, Vals, AbbrevToUse);
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}
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/// WriteTypeTable - Write out the type table for a module.
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static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
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const ValueEnumerator::TypeList &TypeList = VE.getTypes();
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Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */);
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SmallVector<uint64_t, 64> TypeVals;
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// FIXME: Set up abbrevs now that we know the width of the type fields, etc.
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// Emit an entry count so the reader can reserve space.
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TypeVals.push_back(TypeList.size());
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Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
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TypeVals.clear();
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// Loop over all of the types, emitting each in turn.
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for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
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const Type *T = TypeList[i].first;
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int AbbrevToUse = 0;
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unsigned Code = 0;
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switch (T->getTypeID()) {
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case Type::PackedStructTyID: // FIXME: Delete Type::PackedStructTyID.
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default: assert(0 && "Unknown type!");
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case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
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case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
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case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
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case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
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case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break;
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case Type::IntegerTyID:
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// INTEGER: [width]
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Code = bitc::TYPE_CODE_INTEGER;
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TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
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break;
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case Type::PointerTyID:
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// POINTER: [pointee type]
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Code = bitc::TYPE_CODE_POINTER;
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TypeVals.push_back(VE.getTypeID(cast<PointerType>(T)->getElementType()));
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break;
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case Type::FunctionTyID: {
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const FunctionType *FT = cast<FunctionType>(T);
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// FUNCTION: [isvararg, #pararms, paramty x N]
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Code = bitc::TYPE_CODE_FUNCTION;
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TypeVals.push_back(FT->isVarArg());
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TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
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// FIXME: PARAM ATTR ID!
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TypeVals.push_back(FT->getNumParams());
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for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
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TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
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break;
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}
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case Type::StructTyID: {
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const StructType *ST = cast<StructType>(T);
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// STRUCT: [ispacked, #elts, eltty x N]
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Code = bitc::TYPE_CODE_STRUCT;
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TypeVals.push_back(ST->isPacked());
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TypeVals.push_back(ST->getNumElements());
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// Output all of the element types...
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for (StructType::element_iterator I = ST->element_begin(),
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E = ST->element_end(); I != E; ++I)
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TypeVals.push_back(VE.getTypeID(*I));
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break;
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}
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case Type::ArrayTyID: {
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const ArrayType *AT = cast<ArrayType>(T);
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// ARRAY: [numelts, eltty]
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Code = bitc::TYPE_CODE_ARRAY;
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TypeVals.push_back(AT->getNumElements());
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TypeVals.push_back(VE.getTypeID(AT->getElementType()));
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break;
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}
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case Type::VectorTyID: {
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const VectorType *VT = cast<VectorType>(T);
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// VECTOR [numelts, eltty]
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Code = bitc::TYPE_CODE_VECTOR;
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TypeVals.push_back(VT->getNumElements());
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TypeVals.push_back(VE.getTypeID(VT->getElementType()));
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break;
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}
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}
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// Emit the finished record.
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Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
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TypeVals.clear();
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}
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Stream.ExitBlock();
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}
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static unsigned getEncodedLinkage(const GlobalValue *GV) {
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switch (GV->getLinkage()) {
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default: assert(0 && "Invalid linkage!");
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case GlobalValue::ExternalLinkage: return 0;
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case GlobalValue::WeakLinkage: return 1;
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case GlobalValue::AppendingLinkage: return 2;
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case GlobalValue::InternalLinkage: return 3;
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case GlobalValue::LinkOnceLinkage: return 4;
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case GlobalValue::DLLImportLinkage: return 5;
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case GlobalValue::DLLExportLinkage: return 6;
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case GlobalValue::ExternalWeakLinkage: return 7;
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}
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}
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static unsigned getEncodedVisibility(const GlobalValue *GV) {
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switch (GV->getVisibility()) {
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default: assert(0 && "Invalid visibility!");
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case GlobalValue::DefaultVisibility: return 0;
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case GlobalValue::HiddenVisibility: return 1;
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}
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}
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// Emit top-level description of module, including target triple, inline asm,
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// descriptors for global variables, and function prototype info.
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static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
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BitstreamWriter &Stream) {
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// Emit the list of dependent libraries for the Module.
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for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
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WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
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// Emit various pieces of data attached to a module.
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if (!M->getTargetTriple().empty())
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WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
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0/*TODO*/, Stream);
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if (!M->getDataLayout().empty())
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WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
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0/*TODO*/, Stream);
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if (!M->getModuleInlineAsm().empty())
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WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
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0/*TODO*/, Stream);
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// Emit information about sections, computing how many there are. Also
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// compute the maximum alignment value.
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std::map<std::string, unsigned> SectionMap;
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unsigned MaxAlignment = 0;
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unsigned MaxGlobalType = 0;
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for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
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GV != E; ++GV) {
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MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
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MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
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if (!GV->hasSection()) continue;
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// Give section names unique ID's.
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unsigned &Entry = SectionMap[GV->getSection()];
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if (Entry != 0) continue;
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WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
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0/*TODO*/, Stream);
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Entry = SectionMap.size();
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}
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for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
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MaxAlignment = std::max(MaxAlignment, F->getAlignment());
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if (!F->hasSection()) continue;
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// Give section names unique ID's.
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unsigned &Entry = SectionMap[F->getSection()];
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if (Entry != 0) continue;
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WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
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0/*TODO*/, Stream);
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Entry = SectionMap.size();
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}
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// Emit abbrev for globals, now that we know # sections and max alignment.
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unsigned SimpleGVarAbbrev = 0;
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if (!M->global_empty()) {
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// Add an abbrev for common globals with no visibility or thread localness.
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BitCodeAbbrev *Abbv = new BitCodeAbbrev();
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Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
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Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
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Log2_32_Ceil(MaxGlobalType+1)));
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Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 1)); // Constant.
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Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
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Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 3)); // Linkage.
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if (MaxAlignment == 0) // Alignment.
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Abbv->Add(BitCodeAbbrevOp(0));
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else {
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unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
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Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
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Log2_32_Ceil(MaxEncAlignment+1)));
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}
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if (SectionMap.empty()) // Section.
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Abbv->Add(BitCodeAbbrevOp(0));
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else
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Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
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Log2_32_Ceil(SectionMap.size())));
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// Don't bother emitting vis + thread local.
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SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
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}
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// Emit the global variable information.
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SmallVector<unsigned, 64> Vals;
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for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
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GV != E; ++GV) {
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unsigned AbbrevToUse = 0;
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// GLOBALVAR: [type, isconst, initid,
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// linkage, alignment, section, visibility, threadlocal]
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Vals.push_back(VE.getTypeID(GV->getType()));
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Vals.push_back(GV->isConstant());
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Vals.push_back(GV->isDeclaration() ? 0 :
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(VE.getValueID(GV->getInitializer()) + 1));
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Vals.push_back(getEncodedLinkage(GV));
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Vals.push_back(Log2_32(GV->getAlignment())+1);
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Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
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if (GV->isThreadLocal() ||
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GV->getVisibility() != GlobalValue::DefaultVisibility) {
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Vals.push_back(getEncodedVisibility(GV));
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Vals.push_back(GV->isThreadLocal());
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} else {
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AbbrevToUse = SimpleGVarAbbrev;
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}
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Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
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Vals.clear();
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}
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// Emit the function proto information.
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for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
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// FUNCTION: [type, callingconv, isproto, linkage, alignment, section,
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// visibility]
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Vals.push_back(VE.getTypeID(F->getType()));
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Vals.push_back(F->getCallingConv());
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Vals.push_back(F->isDeclaration());
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Vals.push_back(getEncodedLinkage(F));
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Vals.push_back(Log2_32(F->getAlignment())+1);
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Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
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Vals.push_back(getEncodedVisibility(F));
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unsigned AbbrevToUse = 0;
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Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
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Vals.clear();
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}
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}
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/// WriteTypeSymbolTable - Emit a block for the specified type symtab.
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static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
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const ValueEnumerator &VE,
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BitstreamWriter &Stream) {
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if (TST.empty()) return;
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Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
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// FIXME: Set up the abbrev, we know how many types there are!
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// FIXME: We know if the type names can use 7-bit ascii.
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SmallVector<unsigned, 64> NameVals;
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for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
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TI != TE; ++TI) {
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unsigned AbbrevToUse = 0;
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// TST_ENTRY: [typeid, namelen, namechar x N]
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NameVals.push_back(VE.getTypeID(TI->second));
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const std::string &Str = TI->first;
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NameVals.push_back(Str.size());
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for (unsigned i = 0, e = Str.size(); i != e; ++i)
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NameVals.push_back(Str[i]);
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// Emit the finished record.
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Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, AbbrevToUse);
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NameVals.clear();
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}
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Stream.ExitBlock();
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}
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// Emit names for globals/functions etc.
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static void WriteValueSymbolTable(const ValueSymbolTable &VST,
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const ValueEnumerator &VE,
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BitstreamWriter &Stream) {
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if (VST.empty()) return;
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Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 3);
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// FIXME: Set up the abbrev, we know how many values there are!
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// FIXME: We know if the type names can use 7-bit ascii.
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SmallVector<unsigned, 64> NameVals;
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for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
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SI != SE; ++SI) {
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unsigned AbbrevToUse = 0;
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// VST_ENTRY: [valueid, namelen, namechar x N]
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NameVals.push_back(VE.getValueID(SI->getValue()));
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NameVals.push_back(SI->getKeyLength());
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for (const char *P = SI->getKeyData(),
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*E = SI->getKeyData()+SI->getKeyLength(); P != E; ++P)
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NameVals.push_back((unsigned char)*P);
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// Emit the finished record.
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Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, AbbrevToUse);
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NameVals.clear();
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}
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Stream.ExitBlock();
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}
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static void WriteConstants(unsigned FirstVal, unsigned LastVal,
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const ValueEnumerator &VE,
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BitstreamWriter &Stream) {
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if (FirstVal == LastVal) return;
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Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 2);
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// FIXME: Install and use abbrevs to reduce size.
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SmallVector<uint64_t, 64> Record;
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const ValueEnumerator::ValueList &Vals = VE.getValues();
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const Type *LastTy = 0;
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for (unsigned i = FirstVal; i != LastVal; ++i) {
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const Value *V = Vals[i].first;
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// If we need to switch types, do so now.
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if (V->getType() != LastTy) {
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LastTy = V->getType();
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Record.push_back(VE.getTypeID(LastTy));
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Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record);
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Record.clear();
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}
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if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
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assert(0 && IA && "FIXME: Inline asm writing unimp!");
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continue;
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}
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const Constant *C = cast<Constant>(V);
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unsigned Code = -1U;
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unsigned AbbrevToUse = 0;
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if (C->isNullValue()) {
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Code = bitc::CST_CODE_NULL;
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} else if (isa<UndefValue>(C)) {
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Code = bitc::CST_CODE_UNDEF;
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} else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
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if (IV->getBitWidth() <= 64) {
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int64_t V = IV->getSExtValue();
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if (V >= 0)
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Record.push_back(V << 1);
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else
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Record.push_back((-V << 1) | 1);
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Code = bitc::CST_CODE_INTEGER;
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} else { // Wide integers, > 64 bits in size.
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// We have an arbitrary precision integer value to write whose
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// bit width is > 64. However, in canonical unsigned integer
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// format it is likely that the high bits are going to be zero.
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// So, we only write the number of active words.
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unsigned NWords = IV->getValue().getActiveWords();
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const uint64_t *RawWords = IV->getValue().getRawData();
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Record.push_back(NWords);
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for (unsigned i = 0; i != NWords; ++i) {
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int64_t V = RawWords[i];
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if (V >= 0)
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Record.push_back(V << 1);
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else
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Record.push_back((-V << 1) | 1);
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}
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Code = bitc::CST_CODE_WIDE_INTEGER;
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}
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} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
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Code = bitc::CST_CODE_FLOAT;
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if (CFP->getType() == Type::FloatTy) {
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Record.push_back(FloatToBits((float)CFP->getValue()));
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} else {
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assert (CFP->getType() == Type::DoubleTy && "Unknown FP type!");
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Record.push_back(DoubleToBits((double)CFP->getValue()));
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}
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} else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
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isa<ConstantVector>(V)) {
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Code = bitc::CST_CODE_AGGREGATE;
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Record.push_back(C->getNumOperands());
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for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
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Record.push_back(VE.getValueID(C->getOperand(i)));
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} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
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Code = bitc::CST_CODE_CONSTEXPR;
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// FIXME: optimize for binops, compares, etc.
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Record.push_back(CE->getOpcode());
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Record.push_back(CE->getNumOperands());
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for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
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Record.push_back(VE.getValueID(C->getOperand(i)));
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// Compares also pass their predicate.
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if (CE->isCompare())
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Record.push_back((unsigned)CE->getPredicate());
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} else {
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assert(0 && "Unknown constant!");
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}
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Stream.EmitRecord(Code, Record, AbbrevToUse);
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Record.clear();
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}
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Stream.ExitBlock();
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}
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static void WriteModuleConstants(const ValueEnumerator &VE,
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BitstreamWriter &Stream) {
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const ValueEnumerator::ValueList &Vals = VE.getValues();
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// Find the first constant to emit, which is the first non-globalvalue value.
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// We know globalvalues have been emitted by WriteModuleInfo.
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for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
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if (!isa<GlobalValue>(Vals[i].first)) {
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WriteConstants(i, Vals.size(), VE, Stream);
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return;
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}
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}
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}
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/// WriteModule - Emit the specified module to the bitstream.
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static void WriteModule(const Module *M, BitstreamWriter &Stream) {
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Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
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// Emit the version number if it is non-zero.
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if (CurVersion) {
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SmallVector<unsigned, 1> VersionVals;
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VersionVals.push_back(CurVersion);
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Stream.EmitRecord(bitc::MODULE_CODE_VERSION, VersionVals);
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}
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// Analyze the module, enumerating globals, functions, etc.
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ValueEnumerator VE(M);
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// Emit information describing all of the types in the module.
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WriteTypeTable(VE, Stream);
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// Emit top-level description of module, including target triple, inline asm,
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// descriptors for global variables, and function prototype info.
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WriteModuleInfo(M, VE, Stream);
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// Emit constants.
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WriteModuleConstants(VE, Stream);
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// Emit the type symbol table information.
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WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
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// Emit names for globals/functions etc.
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WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
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Stream.ExitBlock();
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}
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/// WriteBitcodeToFile - Write the specified module to the specified output
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/// stream.
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void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) {
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std::vector<unsigned char> Buffer;
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BitstreamWriter Stream(Buffer);
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Buffer.reserve(256*1024);
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// Emit the file header.
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Stream.Emit((unsigned)'B', 8);
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Stream.Emit((unsigned)'C', 8);
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Stream.Emit(0x0, 4);
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Stream.Emit(0xC, 4);
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Stream.Emit(0xE, 4);
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Stream.Emit(0xD, 4);
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// Emit the module.
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WriteModule(M, Stream);
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// Write the generated bitstream to "Out".
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Out.write((char*)&Buffer.front(), Buffer.size());
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}
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