mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-13 06:06:27 +00:00
ef5dc366e7
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55259 91177308-0d34-0410-b5e6-96231b3b80d8
457 lines
12 KiB
C++
457 lines
12 KiB
C++
//===-- BrainF.cpp - BrainF compiler example ----------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===--------------------------------------------------------------------===//
|
|
//
|
|
// This class compiles the BrainF language into LLVM assembly.
|
|
//
|
|
// The BrainF language has 8 commands:
|
|
// Command Equivalent C Action
|
|
// ------- ------------ ------
|
|
// , *h=getchar(); Read a character from stdin, 255 on EOF
|
|
// . putchar(*h); Write a character to stdout
|
|
// - --*h; Decrement tape
|
|
// + ++*h; Increment tape
|
|
// < --h; Move head left
|
|
// > ++h; Move head right
|
|
// [ while(*h) { Start loop
|
|
// ] } End loop
|
|
//
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
#include "BrainF.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/Intrinsics.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include <iostream>
|
|
using namespace llvm;
|
|
|
|
//Set the constants for naming
|
|
const char *BrainF::tapereg = "tape";
|
|
const char *BrainF::headreg = "head";
|
|
const char *BrainF::label = "brainf";
|
|
const char *BrainF::testreg = "test";
|
|
|
|
Module *BrainF::parse(std::istream *in1, int mem, CompileFlags cf) {
|
|
in = in1;
|
|
memtotal = mem;
|
|
comflag = cf;
|
|
|
|
header();
|
|
readloop(0, 0, 0);
|
|
delete builder;
|
|
return module;
|
|
}
|
|
|
|
void BrainF::header() {
|
|
module = new Module("BrainF");
|
|
|
|
//Function prototypes
|
|
|
|
//declare void @llvm.memset.i32(i8 *, i8, i32, i32)
|
|
Function *memset_func = Intrinsic::getDeclaration(module, Intrinsic::memset_i32);
|
|
|
|
//declare i32 @getchar()
|
|
getchar_func = cast<Function>(module->
|
|
getOrInsertFunction("getchar", IntegerType::Int32Ty, NULL));
|
|
|
|
//declare i32 @putchar(i32)
|
|
putchar_func = cast<Function>(module->
|
|
getOrInsertFunction("putchar", IntegerType::Int32Ty,
|
|
IntegerType::Int32Ty, NULL));
|
|
|
|
|
|
//Function header
|
|
|
|
//define void @brainf()
|
|
brainf_func = cast<Function>(module->
|
|
getOrInsertFunction("brainf", Type::VoidTy, NULL));
|
|
|
|
builder = new IRBuilder<>(BasicBlock::Create(label, brainf_func));
|
|
|
|
//%arr = malloc i8, i32 %d
|
|
ConstantInt *val_mem = ConstantInt::get(APInt(32, memtotal));
|
|
ptr_arr = builder->CreateMalloc(IntegerType::Int8Ty, val_mem, "arr");
|
|
|
|
//call void @llvm.memset.i32(i8 *%arr, i8 0, i32 %d, i32 1)
|
|
{
|
|
Value *memset_params[] = {
|
|
ptr_arr,
|
|
ConstantInt::get(APInt(8, 0)),
|
|
val_mem,
|
|
ConstantInt::get(APInt(32, 1))
|
|
};
|
|
|
|
CallInst *memset_call = builder->
|
|
CreateCall(memset_func, memset_params, array_endof(memset_params));
|
|
memset_call->setTailCall(false);
|
|
}
|
|
|
|
//%arrmax = getelementptr i8 *%arr, i32 %d
|
|
if (comflag & flag_arraybounds) {
|
|
ptr_arrmax = builder->
|
|
CreateGEP(ptr_arr, ConstantInt::get(APInt(32, memtotal)), "arrmax");
|
|
}
|
|
|
|
//%head.%d = getelementptr i8 *%arr, i32 %d
|
|
curhead = builder->CreateGEP(ptr_arr,
|
|
ConstantInt::get(APInt(32, memtotal/2)),
|
|
headreg);
|
|
|
|
|
|
|
|
//Function footer
|
|
|
|
//brainf.end:
|
|
endbb = BasicBlock::Create(label, brainf_func);
|
|
|
|
//free i8 *%arr
|
|
new FreeInst(ptr_arr, endbb);
|
|
|
|
//ret void
|
|
ReturnInst::Create(endbb);
|
|
|
|
|
|
|
|
//Error block for array out of bounds
|
|
if (comflag & flag_arraybounds)
|
|
{
|
|
//@aberrormsg = internal constant [%d x i8] c"\00"
|
|
Constant *msg_0 = ConstantArray::
|
|
get("Error: The head has left the tape.", true);
|
|
|
|
GlobalVariable *aberrormsg = new GlobalVariable(
|
|
msg_0->getType(),
|
|
true,
|
|
GlobalValue::InternalLinkage,
|
|
msg_0,
|
|
"aberrormsg",
|
|
module);
|
|
|
|
//declare i32 @puts(i8 *)
|
|
Function *puts_func = cast<Function>(module->
|
|
getOrInsertFunction("puts", IntegerType::Int32Ty,
|
|
PointerType::getUnqual(IntegerType::Int8Ty), NULL));
|
|
|
|
//brainf.aberror:
|
|
aberrorbb = BasicBlock::Create(label, brainf_func);
|
|
|
|
//call i32 @puts(i8 *getelementptr([%d x i8] *@aberrormsg, i32 0, i32 0))
|
|
{
|
|
Constant *zero_32 = Constant::getNullValue(IntegerType::Int32Ty);
|
|
|
|
Constant *gep_params[] = {
|
|
zero_32,
|
|
zero_32
|
|
};
|
|
|
|
Constant *msgptr = ConstantExpr::
|
|
getGetElementPtr(aberrormsg, gep_params,
|
|
array_lengthof(gep_params));
|
|
|
|
Value *puts_params[] = {
|
|
msgptr
|
|
};
|
|
|
|
CallInst *puts_call =
|
|
CallInst::Create(puts_func,
|
|
puts_params, array_endof(puts_params),
|
|
"", aberrorbb);
|
|
puts_call->setTailCall(false);
|
|
}
|
|
|
|
//br label %brainf.end
|
|
BranchInst::Create(endbb, aberrorbb);
|
|
}
|
|
}
|
|
|
|
void BrainF::readloop(PHINode *phi, BasicBlock *oldbb, BasicBlock *testbb) {
|
|
Symbol cursym = SYM_NONE;
|
|
int curvalue = 0;
|
|
Symbol nextsym = SYM_NONE;
|
|
int nextvalue = 0;
|
|
char c;
|
|
int loop;
|
|
int direction;
|
|
|
|
while(cursym != SYM_EOF && cursym != SYM_ENDLOOP) {
|
|
// Write out commands
|
|
switch(cursym) {
|
|
case SYM_NONE:
|
|
// Do nothing
|
|
break;
|
|
|
|
case SYM_READ:
|
|
{
|
|
//%tape.%d = call i32 @getchar()
|
|
CallInst *getchar_call = builder->CreateCall(getchar_func, tapereg);
|
|
getchar_call->setTailCall(false);
|
|
Value *tape_0 = getchar_call;
|
|
|
|
//%tape.%d = trunc i32 %tape.%d to i8
|
|
Value *tape_1 = builder->
|
|
CreateTrunc(tape_0, IntegerType::Int8Ty, tapereg);
|
|
|
|
//store i8 %tape.%d, i8 *%head.%d
|
|
builder->CreateStore(tape_1, curhead);
|
|
}
|
|
break;
|
|
|
|
case SYM_WRITE:
|
|
{
|
|
//%tape.%d = load i8 *%head.%d
|
|
LoadInst *tape_0 = builder->CreateLoad(curhead, tapereg);
|
|
|
|
//%tape.%d = sext i8 %tape.%d to i32
|
|
Value *tape_1 = builder->
|
|
CreateSExt(tape_0, IntegerType::Int32Ty, tapereg);
|
|
|
|
//call i32 @putchar(i32 %tape.%d)
|
|
Value *putchar_params[] = {
|
|
tape_1
|
|
};
|
|
CallInst *putchar_call = builder->
|
|
CreateCall(putchar_func,
|
|
putchar_params, array_endof(putchar_params));
|
|
putchar_call->setTailCall(false);
|
|
}
|
|
break;
|
|
|
|
case SYM_MOVE:
|
|
{
|
|
//%head.%d = getelementptr i8 *%head.%d, i32 %d
|
|
curhead = builder->
|
|
CreateGEP(curhead, ConstantInt::get(APInt(32, curvalue)),
|
|
headreg);
|
|
|
|
//Error block for array out of bounds
|
|
if (comflag & flag_arraybounds)
|
|
{
|
|
//%test.%d = icmp uge i8 *%head.%d, %arrmax
|
|
Value *test_0 = builder->
|
|
CreateICmpUGE(curhead, ptr_arrmax, testreg);
|
|
|
|
//%test.%d = icmp ult i8 *%head.%d, %arr
|
|
Value *test_1 = builder->
|
|
CreateICmpULT(curhead, ptr_arr, testreg);
|
|
|
|
//%test.%d = or i1 %test.%d, %test.%d
|
|
Value *test_2 = builder->
|
|
CreateOr(test_0, test_1, testreg);
|
|
|
|
//br i1 %test.%d, label %main.%d, label %main.%d
|
|
BasicBlock *nextbb = BasicBlock::Create(label, brainf_func);
|
|
builder->CreateCondBr(test_2, aberrorbb, nextbb);
|
|
|
|
//main.%d:
|
|
builder->SetInsertPoint(nextbb);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SYM_CHANGE:
|
|
{
|
|
//%tape.%d = load i8 *%head.%d
|
|
LoadInst *tape_0 = builder->CreateLoad(curhead, tapereg);
|
|
|
|
//%tape.%d = add i8 %tape.%d, %d
|
|
Value *tape_1 = builder->
|
|
CreateAdd(tape_0, ConstantInt::get(APInt(8, curvalue)), tapereg);
|
|
|
|
//store i8 %tape.%d, i8 *%head.%d\n"
|
|
builder->CreateStore(tape_1, curhead);
|
|
}
|
|
break;
|
|
|
|
case SYM_LOOP:
|
|
{
|
|
//br label %main.%d
|
|
BasicBlock *testbb = BasicBlock::Create(label, brainf_func);
|
|
builder->CreateBr(testbb);
|
|
|
|
//main.%d:
|
|
BasicBlock *bb_0 = builder->GetInsertBlock();
|
|
BasicBlock *bb_1 = BasicBlock::Create(label, brainf_func);
|
|
builder->SetInsertPoint(bb_1);
|
|
|
|
// Make part of PHI instruction now, wait until end of loop to finish
|
|
PHINode *phi_0 =
|
|
PHINode::Create(PointerType::getUnqual(IntegerType::Int8Ty),
|
|
headreg, testbb);
|
|
phi_0->reserveOperandSpace(2);
|
|
phi_0->addIncoming(curhead, bb_0);
|
|
curhead = phi_0;
|
|
|
|
readloop(phi_0, bb_1, testbb);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
std::cerr << "Error: Unknown symbol.\n";
|
|
abort();
|
|
break;
|
|
}
|
|
|
|
cursym = nextsym;
|
|
curvalue = nextvalue;
|
|
nextsym = SYM_NONE;
|
|
|
|
// Reading stdin loop
|
|
loop = (cursym == SYM_NONE)
|
|
|| (cursym == SYM_MOVE)
|
|
|| (cursym == SYM_CHANGE);
|
|
while(loop) {
|
|
*in>>c;
|
|
if (in->eof()) {
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_EOF;
|
|
} else {
|
|
nextsym = SYM_EOF;
|
|
}
|
|
loop = 0;
|
|
} else {
|
|
direction = 1;
|
|
switch(c) {
|
|
case '-':
|
|
direction = -1;
|
|
// Fall through
|
|
|
|
case '+':
|
|
if (cursym == SYM_CHANGE) {
|
|
curvalue += direction;
|
|
// loop = 1
|
|
} else {
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_CHANGE;
|
|
curvalue = direction;
|
|
// loop = 1
|
|
} else {
|
|
nextsym = SYM_CHANGE;
|
|
nextvalue = direction;
|
|
loop = 0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case '<':
|
|
direction = -1;
|
|
// Fall through
|
|
|
|
case '>':
|
|
if (cursym == SYM_MOVE) {
|
|
curvalue += direction;
|
|
// loop = 1
|
|
} else {
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_MOVE;
|
|
curvalue = direction;
|
|
// loop = 1
|
|
} else {
|
|
nextsym = SYM_MOVE;
|
|
nextvalue = direction;
|
|
loop = 0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case ',':
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_READ;
|
|
} else {
|
|
nextsym = SYM_READ;
|
|
}
|
|
loop = 0;
|
|
break;
|
|
|
|
case '.':
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_WRITE;
|
|
} else {
|
|
nextsym = SYM_WRITE;
|
|
}
|
|
loop = 0;
|
|
break;
|
|
|
|
case '[':
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_LOOP;
|
|
} else {
|
|
nextsym = SYM_LOOP;
|
|
}
|
|
loop = 0;
|
|
break;
|
|
|
|
case ']':
|
|
if (cursym == SYM_NONE) {
|
|
cursym = SYM_ENDLOOP;
|
|
} else {
|
|
nextsym = SYM_ENDLOOP;
|
|
}
|
|
loop = 0;
|
|
break;
|
|
|
|
// Ignore other characters
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (cursym == SYM_ENDLOOP) {
|
|
if (!phi) {
|
|
std::cerr << "Error: Extra ']'\n";
|
|
abort();
|
|
}
|
|
|
|
// Write loop test
|
|
{
|
|
//br label %main.%d
|
|
builder->CreateBr(testbb);
|
|
|
|
//main.%d:
|
|
|
|
//%head.%d = phi i8 *[%head.%d, %main.%d], [%head.%d, %main.%d]
|
|
//Finish phi made at beginning of loop
|
|
phi->addIncoming(curhead, builder->GetInsertBlock());
|
|
Value *head_0 = phi;
|
|
|
|
//%tape.%d = load i8 *%head.%d
|
|
LoadInst *tape_0 = new LoadInst(head_0, tapereg, testbb);
|
|
|
|
//%test.%d = icmp eq i8 %tape.%d, 0
|
|
ICmpInst *test_0 = new ICmpInst(ICmpInst::ICMP_EQ, tape_0,
|
|
ConstantInt::get(APInt(8, 0)), testreg,
|
|
testbb);
|
|
|
|
//br i1 %test.%d, label %main.%d, label %main.%d
|
|
BasicBlock *bb_0 = BasicBlock::Create(label, brainf_func);
|
|
BranchInst::Create(bb_0, oldbb, test_0, testbb);
|
|
|
|
//main.%d:
|
|
builder->SetInsertPoint(bb_0);
|
|
|
|
//%head.%d = phi i8 *[%head.%d, %main.%d]
|
|
PHINode *phi_1 = builder->
|
|
CreatePHI(PointerType::getUnqual(IntegerType::Int8Ty), headreg);
|
|
phi_1->reserveOperandSpace(1);
|
|
phi_1->addIncoming(head_0, testbb);
|
|
curhead = phi_1;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
//End of the program, so go to return block
|
|
builder->CreateBr(endbb);
|
|
|
|
if (phi) {
|
|
std::cerr << "Error: Missing ']'\n";
|
|
abort();
|
|
}
|
|
}
|