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//===-- EmitBytecodeToAssembly.cpp - Emit bytecode to Sparc .s File --------==//
//
// This file implements the pass that writes LLVM bytecode as data to a sparc
// assembly file. The bytecode gets assembled into a special bytecode section
// of the executable for use at runtime later.
//
//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "llvm/Pass.h"
#include "llvm/Bytecode/Writer.h"
#include <iostream>
namespace {
// sparcasmbuf - stream buf for encoding output bytes as .byte directives for
// the sparc assembler.
//
class sparcasmbuf : public streambuf {
std::ostream &BaseStr;
public:
typedef char char_type;
typedef int int_type;
typedef std::streampos pos_type;
typedef std::streamoff off_type;
sparcasmbuf(std::ostream &On) : BaseStr(On) {}
virtual int_type overflow(int_type C) {
if (C != EOF)
BaseStr << "\t.byte " << C << "\n"; // Output C;
return C;
}
};
// osparcasmstream - Define an ostream implementation that uses a sparcasmbuf
// as the underlying streambuf to write the data to. This streambuf formats
// the output as .byte directives for sparc output.
//
class osparcasmstream : public ostream {
sparcasmbuf sb;
public:
typedef char char_type;
typedef int int_type;
typedef std::streampos pos_type;
typedef std::streamoff off_type;
explicit osparcasmstream(ostream &On) : ostream(&sb), sb(On) { }
sparcasmbuf *rdbuf() const {
return const_cast<sparcasmbuf*>(&sb);
}
};
// SparcBytecodeWriter - Write bytecode out to a stream that is sparc'ified
class SparcBytecodeWriter : public Pass {
std::ostream &Out;
public:
SparcBytecodeWriter(std::ostream &out) : Out(out) {}
const char *getPassName() const { return "Emit Bytecode to Sparc Assembly";}
virtual bool run(Module *M) {
// Write bytecode out to the sparc assembly stream
Out << "\n\n!LLVM BYTECODE OUTPUT\n\t.section \".rodata\"\n\t.align 8\n";
Out << "\t.global LLVMBytecode\n\t.type LLVMBytecode,#object\n";
Out << "LLVMBytecode:\n";
osparcasmstream OS(Out);
WriteBytecodeToFile(M, OS);
Out << ".end_LLVMBytecode:\n";
Out << "\t.size LLVMBytecode, .end_LLVMBytecode-LLVMBytecode\n\n";
return false;
}
};
} // end anonymous namespace
Pass *UltraSparc::getEmitBytecodeToAsmPass(std::ostream &Out) {
return new SparcBytecodeWriter(Out);
}
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