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116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
//===-- EmitBytecodeToAssembly.cpp - Emit bytecode to Sparc .s File --------==//
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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 file implements the pass that writes LLVM bytecode as data to a sparc
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// assembly file. The bytecode gets assembled into a special bytecode section
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// of the executable for use at runtime later.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcInternals.h"
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#include "llvm/Pass.h"
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#include "llvm/Bytecode/Writer.h"
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#include <iostream>
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using std::ostream;
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namespace {
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// sparcasmbuf - stream buf for encoding output bytes as .byte directives for
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// the sparc assembler.
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//
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class sparcasmbuf : public std::streambuf {
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std::ostream &BaseStr;
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public:
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typedef char char_type;
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typedef int int_type;
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typedef std::streampos pos_type;
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typedef std::streamoff off_type;
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sparcasmbuf(std::ostream &On) : BaseStr(On) {}
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virtual int_type overflow(int_type C) {
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if (C != EOF)
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BaseStr << "\t.byte " << C << "\n"; // Output C;
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return C;
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}
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};
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// osparcasmstream - Define an ostream implementation that uses a sparcasmbuf
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// as the underlying streambuf to write the data to. This streambuf formats
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// the output as .byte directives for sparc output.
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//
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class osparcasmstream : public std::ostream {
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sparcasmbuf sb;
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public:
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typedef char char_type;
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typedef int int_type;
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typedef std::streampos pos_type;
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typedef std::streamoff off_type;
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explicit osparcasmstream(std::ostream &On) : std::ostream(&sb), sb(On) { }
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sparcasmbuf *rdbuf() const {
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return const_cast<sparcasmbuf*>(&sb);
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}
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};
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static void writePrologue (std::ostream &Out, const std::string &comment,
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const std::string &symName) {
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// Prologue:
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// Output a comment describing the object.
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Out << "!" << comment << "\n";
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// Switch the current section to .rodata in the assembly output:
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Out << "\t.section \".rodata\"\n\t.align 8\n";
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// Output a global symbol naming the object:
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Out << "\t.global " << symName << "\n";
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Out << "\t.type " << symName << ",#object\n";
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Out << symName << ":\n";
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}
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static void writeEpilogue (std::ostream &Out, const std::string &symName) {
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// Epilogue:
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// Output a local symbol marking the end of the object:
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Out << ".end_" << symName << ":\n";
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// Output size directive giving the size of the object:
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Out << "\t.size " << symName << ", .end_" << symName << "-" << symName
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<< "\n";
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}
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// SparcBytecodeWriter - Write bytecode out to a stream that is sparc'ified
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class SparcBytecodeWriter : public Pass {
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std::ostream &Out;
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public:
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SparcBytecodeWriter(std::ostream &out) : Out(out) {}
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const char *getPassName() const { return "Emit Bytecode to Sparc Assembly";}
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virtual bool run(Module &M) {
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// Write an object containing the bytecode to the SPARC assembly stream
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writePrologue (Out, "LLVM BYTECODE OUTPUT", "LLVMBytecode");
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osparcasmstream OS(Out);
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WriteBytecodeToFile(&M, OS);
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writeEpilogue (Out, "LLVMBytecode");
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// Write an object containing its length as an integer to the
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// SPARC assembly stream
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writePrologue (Out, "LLVM BYTECODE LENGTH", "llvm_length");
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Out <<"\t.word\t.end_LLVMBytecode-LLVMBytecode\n";
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writeEpilogue (Out, "llvm_length");
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return false;
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}
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};
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} // end anonymous namespace
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Pass *UltraSparc::getBytecodeAsmPrinterPass(std::ostream &Out) {
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return new SparcBytecodeWriter(Out);
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}
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