mirror of
https://github.com/c64scene-ar/llvm-6502.git
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186a1f71e6
- Null values are implicitly encoded instead of explicitly, this makes
things more compact!
- More compactly represent ConstantPointerRefs
- Bytecode files are represented as:
Header|GlobalTypes|GlobalVars/Function Protos|Constants|Functions|SymTab
instead of
Header|GlobalTypes|Constants|GlobalVars/Function Protos|Functions|SymTab
which makes a lot of things simpler.
Writer changes:
- We now explictly encode versioning information in the bytecode files.
- This allows new code to read bytecode files produced by old code, but
new bytecode files can have enhancements such as the above. Although this
makes the reader a bit more complex (having to deal with old formats), the
writer only needs to be able to produce the most recent version.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5749 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//===-- WriterInternals.h - Data structures shared by the Writer -*- C++ -*--=//
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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 "llvm/Bytecode/Format.h"
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#include "llvm/Bytecode/Primitives.h"
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#include "llvm/SlotCalculator.h"
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#include "llvm/Instruction.h"
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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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protected:
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void outputConstants(bool isFunction);
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void outputFunction(const Function *F);
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void processBasicBlock(const BasicBlock &BB);
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void processInstruction(const Instruction &I);
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private :
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inline void outputSignature() {
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static const unsigned char *Sig = (const unsigned char*)"llvm";
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Out.insert(Out.end(), Sig, Sig+4); // output the bytecode signature...
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}
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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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bool 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 that helps us do backpatching of bytecode
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// block sizes really easily. It backpatches when 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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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) : Out(o) {
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output(ID, Out);
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output((unsigned)0, 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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//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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#endif
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