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237cef4b0b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21380 91177308-0d34-0410-b5e6-96231b3b80d8
209 lines
6.8 KiB
C++
209 lines
6.8 KiB
C++
//===-- BFtoLLVM.cpp - BF language Front End for LLVM ---------------------===//
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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 is a simple front end for the BF language. It is compatible with the
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// language as described in "The BrainF*** Language Specification (01 January
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// 2002)", which is available from http://esoteric.sange.fi/ENSI . It does not
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// implement the optional keyword # ("Output partial tape state").
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//
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//===----------------------------------------------------------------------===//
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#include <iostream>
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#include <vector>
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#include <fstream>
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#include <cerrno>
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#include <cstring>
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#include <string>
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#include <cstdio>
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#include <cassert>
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void emitDeclarations(std::ofstream &dest) {
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dest << "; This assembly code brought to you by BFtoLLVM\n"
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<< "\nimplementation\n"
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<< "\n; Declarations\n"
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<< "\ndeclare int %getchar()\n"
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<< "declare int %putchar(int)\n"
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<< "declare void %llvm.memset(sbyte*, ubyte, uint, uint)\n"
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<< "\n";
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}
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void emitMainFunctionProlog(std::ofstream &dest) {
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dest << "\n; Main function\n"
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<< "int %main(int %argc, sbyte** %argv) {\n"
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<< "\nentry:\n"
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<< "%arr = alloca sbyte, uint 30000\n"
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<< "call void (sbyte*, ubyte, uint, uint)* %llvm.memset(sbyte* %arr, ubyte 0, uint 30000, uint 1)\n"
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<< "%ptrbox = alloca sbyte*\n"
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<< "store sbyte* %arr, sbyte **%ptrbox\n"
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<< "\n";
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}
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void emitMainFunctionEpilog(std::ofstream &dest) {
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dest << "ret int 0\n"
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<< "}\n";
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}
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std::string gensym (const std::string varName, bool percent = true) {
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char buf[80];
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static unsigned int SymbolCounter = 0;
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sprintf (buf, "%s%s%u", percent ? "%" : "", varName.c_str(), SymbolCounter++);
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return std::string (buf);
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}
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void emitArith (std::string op, char delta, std::ofstream &dest) {
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std::string ptr = gensym (op + "ptr"),
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val = gensym (op + "val"),
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result = gensym (op + "result");
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dest << ptr << " = load sbyte** %ptrbox\n"
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<< val << " = load sbyte* " << ptr << "\n"
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<< result << " = add sbyte " << val << ", " << (int)delta << "\n"
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<< "store sbyte " << result << ", sbyte* " << ptr << "\n";
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}
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// + becomes ++*p; and - becomes --*p;
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void emitPlus (std::ofstream &dest, int ct) { emitArith ("plus", +ct, dest); }
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void emitMinus (std::ofstream &dest, int ct) { emitArith ("minus", -ct, dest); }
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void emitLoadAndCast (std::string ptr, std::string val, std::string cast,
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std::string type, std::ofstream &dest) {
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dest << ptr << " = load sbyte** %ptrbox\n"
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<< val << " = load sbyte* " << ptr << "\n"
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<< cast << " = cast sbyte " << val << " to " << type << "\n";
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}
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// , becomes *p = getchar();
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void emitComma(std::ofstream &dest, int ct) {
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assert (ct == 1);
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std::string ptr = gensym("commaptr"), read = gensym("commaread"),
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cast = gensym("commacast");
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dest << ptr << " = load sbyte** %ptrbox\n"
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<< read << " = call int %getchar()\n"
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<< cast << " = cast int " << read << " to sbyte\n"
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<< "store sbyte " << cast << ", sbyte* " << ptr << "\n";
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}
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// . becomes putchar(*p);
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void emitDot(std::ofstream &dest, int ct) {
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assert (ct == 1);
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std::string ptr = gensym("dotptr"), val = gensym("dotval"),
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cast = gensym("dotcast");
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emitLoadAndCast (ptr, val, cast, "int", dest);
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dest << "call int %putchar(int " << cast << ")\n";
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}
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void emitPointerArith(std::string opname, int delta, std::ofstream &dest) {
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std::string ptr = gensym(opname + "ptr"), result = gensym(opname + "result");
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dest << ptr << " = load sbyte** %ptrbox\n"
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<< result << " = getelementptr sbyte* " << ptr << ", int " << delta
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<< "\n"
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<< "store sbyte* " << result << ", sbyte** %ptrbox\n";
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}
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// < becomes --p; and > becomes ++p;
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void emitLT(std::ofstream &dest, int ct) { emitPointerArith ("lt", -ct, dest); }
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void emitGT(std::ofstream &dest, int ct) { emitPointerArith ("gt", +ct, dest); }
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static std::vector<std::string> whileStack;
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// [ becomes while (*p) {
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void emitLeftBracket(std::ofstream &dest, int ct) {
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assert (ct == 1);
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std::string whileName = gensym ("While", false);
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whileStack.push_back (whileName);
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dest << "br label %testFor" << whileName << "\n"
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<< "\ninside" << whileName << ":\n";
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}
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// ] becomes }
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void emitRightBracket(std::ofstream &dest, int ct) {
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assert (ct == 1);
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std::string whileName = whileStack.back (),
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ptr = gensym("bracketptr"),
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val = gensym("bracketval"),
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cast = gensym("bracketcast");
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whileStack.pop_back ();
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dest << "br label %testFor" << whileName << "\n"
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<< "\ntestFor" << whileName << ":\n";
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emitLoadAndCast (ptr, val, cast, "bool", dest);
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dest << "br bool " << cast << ", label %inside" << whileName << ", "
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<< "label %after" << whileName << "\n"
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<< "\nafter" << whileName << ":\n";
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}
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typedef void (*FuncTy)(std::ofstream &, int);
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static FuncTy table[256];
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static bool multi[256];
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void consume (int ch, int repeatCount, std::ofstream &dest) {
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FuncTy func = table[ch];
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if (!func)
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return;
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else if (multi[ch])
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func (dest, repeatCount);
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else
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for (int i = 0; i < repeatCount; ++i)
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func (dest, 1);
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}
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void initializeTable() {
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memset (table, 0, 256);
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memset (multi, 0, 256);
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table[(int)'+'] = emitPlus; multi[(int)'+'] = true;
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table[(int)'-'] = emitMinus; multi[(int)'-'] = true;
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table[(int)','] = emitComma; multi[(int)','] = false;
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table[(int)'.'] = emitDot; multi[(int)'.'] = false;
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table[(int)'<'] = emitLT; multi[(int)'<'] = true;
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table[(int)'>'] = emitGT; multi[(int)'>'] = true;
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table[(int)'['] = emitLeftBracket; multi[(int)'['] = false;
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table[(int)']'] = emitRightBracket; multi[(int)']'] = false;
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}
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int main (int argc, char **argv) {
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if (argc != 3) {
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std::cerr << "usage: " << argv[0] << " input-source output-llvm\n";
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return 1;
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}
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char *sourceFileName = argv[1];
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char *destFileName = argv[2];
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std::ifstream src (sourceFileName);
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if (!src.good()) {
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std::cerr << sourceFileName << ": " << strerror(errno) << "\n";
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return 1;
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}
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std::ofstream dest (destFileName);
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if (!dest.good()) {
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std::cerr << destFileName << ": " << strerror(errno) << "\n";
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return 1;
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}
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emitDeclarations(dest);
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emitMainFunctionProlog(dest);
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initializeTable();
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char ch, lastCh;
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src >> lastCh;
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int repeatCount = 1;
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for (src >> ch; !src.eof (); src >> ch, ++repeatCount)
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if (ch != lastCh) {
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consume (lastCh, repeatCount, dest);
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lastCh = ch;
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repeatCount = 0;
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}
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consume (lastCh, repeatCount, dest);
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emitMainFunctionEpilog(dest);
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src.close();
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dest.close();
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return 0;
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}
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