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https://github.com/c64scene-ar/llvm-6502.git
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0baa0af861
This saves about 15K in 176.gcc, coupled with another patch that I'm working on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10889 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
//===- WriterInternals.h - Data structures shared by the Writer -*- 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 the LLVM research group 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 interface used between components of the bytecode
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// writer.
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//
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// Note that the performance of this library is not terribly important, because
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// it shouldn't be used by JIT type applications... so it is not a huge focus
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// at least. :)
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_BYTECODE_WRITER_WRITERINTERNALS_H
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#define LLVM_LIB_BYTECODE_WRITER_WRITERINTERNALS_H
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#include "llvm/Bytecode/Writer.h"
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#include "WriterPrimitives.h"
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#include "llvm/Bytecode/Format.h"
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#include "llvm/SlotCalculator.h"
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#include "llvm/Instruction.h"
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namespace llvm {
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class BytecodeWriter {
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std::deque<unsigned char> &Out;
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SlotCalculator Table;
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public:
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BytecodeWriter(std::deque<unsigned char> &o, const Module *M);
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private:
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void outputConstants(bool isFunction);
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void outputConstantStrings();
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void outputFunction(const Function *F);
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void processInstruction(const Instruction &I);
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void outputModuleInfoBlock(const Module *C);
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void outputSymbolTable(const SymbolTable &ST);
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void outputConstantsInPlane(const std::vector<const Value*> &Plane,
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unsigned StartNo);
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void outputConstant(const Constant *CPV);
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void outputType(const Type *T);
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};
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/// BytecodeBlock - Little helper class is used by the bytecode writer to help
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/// do backpatching of bytecode block sizes really easily. It backpatches when
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/// it goes out of scope.
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///
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class BytecodeBlock {
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unsigned Loc;
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std::deque<unsigned char> &Out;
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/// ElideIfEmpty - If this is true and the bytecode block ends up being empty,
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/// the block can remove itself from the output stream entirely.
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bool ElideIfEmpty;
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BytecodeBlock(const BytecodeBlock &); // do not implement
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void operator=(const BytecodeBlock &); // do not implement
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public:
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inline BytecodeBlock(unsigned ID, std::deque<unsigned char> &o,
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bool elideIfEmpty = false)
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: Out(o), ElideIfEmpty(elideIfEmpty) {
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output(ID, Out);
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output(0U, Out); // Reserve the space for the block size...
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Loc = Out.size();
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}
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inline ~BytecodeBlock() { // Do backpatch when block goes out
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// of scope...
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if (Loc == Out.size() && ElideIfEmpty) {
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// If the block is empty, and we are allowed to, do not emit the block at
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// all!
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Out.resize(Out.size()-8);
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return;
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}
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//cerr << "OldLoc = " << Loc << " NewLoc = " << NewLoc << " diff = "
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// << (NewLoc-Loc) << endl;
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output(unsigned(Out.size()-Loc), Out, int(Loc-4));
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align32(Out); // Blocks must ALWAYS be aligned
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}
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};
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} // End llvm namespace
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#endif
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