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llvm-mirror/examples/BrainF/BrainF.cpp
Victor Hernandez 8736a8fca4 Re-commit r86077 now that r86290 fixes the 179.art and 175.vpr ARM regressions. 
Here is the original commit message:

This commit updates malloc optimizations to operate on malloc calls that have constant int size arguments.

Update CreateMalloc so that its callers specify the size to allocate:
MallocInst-autoupgrade users use non-TargetData-computed allocation sizes.
Optimization uses use TargetData to compute the allocation size.

Now that malloc calls can have constant sizes, update isArrayMallocHelper() to use TargetData to determine the size of the malloced type and the size of malloced arrays.
Extend getMallocType() to support malloc calls that have non-bitcast uses.

Update OptimizeGlobalAddressOfMalloc() to optimize malloc calls that have non-bitcast uses.  The bitcast use of a malloc call has to be treated specially here because the uses of the bitcast need to be replaced and the bitcast needs to be erased (just like the malloc call) for OptimizeGlobalAddressOfMalloc() to work correctly.

Update PerformHeapAllocSRoA() to optimize malloc calls that have non-bitcast uses.  The bitcast use of the malloc is not handled specially here because ReplaceUsesOfMallocWithGlobal replaces through the bitcast use.

Update OptimizeOnceStoredGlobal() to not care about the malloc calls' bitcast use.

Update all globalopt malloc tests to not rely on autoupgraded-MallocInsts, but instead use explicit malloc calls with correct allocation sizes.

llvm-svn: 86311
2009-11-07 00:16:28 +00:00

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//===-- 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/Instructions.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,
LLVMContext& Context) {
in = in1;
memtotal = mem;
comflag = cf;
header(Context);
readloop(0, 0, 0, Context);
delete builder;
return module;
}
void BrainF::header(LLVMContext& C) {
module = new Module("BrainF", C);
//Function prototypes
//declare void @llvm.memset.i32(i8 *, i8, i32, i32)
const Type *Tys[] = { Type::getInt32Ty(C) };
Function *memset_func = Intrinsic::getDeclaration(module, Intrinsic::memset,
Tys, 1);
//declare i32 @getchar()
getchar_func = cast<Function>(module->
getOrInsertFunction("getchar", IntegerType::getInt32Ty(C), NULL));
//declare i32 @putchar(i32)
putchar_func = cast<Function>(module->
getOrInsertFunction("putchar", IntegerType::getInt32Ty(C),
IntegerType::getInt32Ty(C), NULL));
//Function header
//define void @brainf()
brainf_func = cast<Function>(module->
getOrInsertFunction("brainf", Type::getVoidTy(C), NULL));
builder = new IRBuilder<>(BasicBlock::Create(C, label, brainf_func));
//%arr = malloc i8, i32 %d
ConstantInt *val_mem = ConstantInt::get(C, APInt(32, memtotal));
BasicBlock* BB = builder->GetInsertBlock();
const Type* IntPtrTy = IntegerType::getInt32Ty(C);
const Type* Int8Ty = IntegerType::getInt8Ty(C);
Constant* allocsize = ConstantExpr::getSizeOf(Int8Ty);
allocsize = ConstantExpr::getTruncOrBitCast(allocsize, IntPtrTy);
ptr_arr = CallInst::CreateMalloc(BB, IntPtrTy, Int8Ty, allocsize, val_mem,
NULL, "arr");
BB->getInstList().push_back(cast<Instruction>(ptr_arr));
//call void @llvm.memset.i32(i8 *%arr, i8 0, i32 %d, i32 1)
{
Value *memset_params[] = {
ptr_arr,
ConstantInt::get(C, APInt(8, 0)),
val_mem,
ConstantInt::get(C, 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(C, APInt(32, memtotal)), "arrmax");
}
//%head.%d = getelementptr i8 *%arr, i32 %d
curhead = builder->CreateGEP(ptr_arr,
ConstantInt::get(C, APInt(32, memtotal/2)),
headreg);
//Function footer
//brainf.end:
endbb = BasicBlock::Create(C, label, brainf_func);
//call free(i8 *%arr)
endbb->getInstList().push_back(CallInst::CreateFree(ptr_arr, endbb));
//ret void
ReturnInst::Create(C, 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(C, "Error: The head has left the tape.", true);
GlobalVariable *aberrormsg = new GlobalVariable(
*module,
msg_0->getType(),
true,
GlobalValue::InternalLinkage,
msg_0,
"aberrormsg");
//declare i32 @puts(i8 *)
Function *puts_func = cast<Function>(module->
getOrInsertFunction("puts", IntegerType::getInt32Ty(C),
PointerType::getUnqual(IntegerType::getInt8Ty(C)), NULL));
//brainf.aberror:
aberrorbb = BasicBlock::Create(C, label, brainf_func);
//call i32 @puts(i8 *getelementptr([%d x i8] *@aberrormsg, i32 0, i32 0))
{
Constant *zero_32 = Constant::getNullValue(IntegerType::getInt32Ty(C));
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,
LLVMContext &C) {
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::getInt8Ty(C), 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::getInt32Ty(C), 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(C, 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(C, 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(C, 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(C, label, brainf_func);
builder->CreateBr(testbb);
//main.%d:
BasicBlock *bb_0 = builder->GetInsertBlock();
BasicBlock *bb_1 = BasicBlock::Create(C, 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::getInt8Ty(C)),
headreg, testbb);
phi_0->reserveOperandSpace(2);
phi_0->addIncoming(curhead, bb_0);
curhead = phi_0;
readloop(phi_0, bb_1, testbb, C);
}
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(*testbb, ICmpInst::ICMP_EQ, tape_0,
ConstantInt::get(C, APInt(8, 0)), testreg);
//br i1 %test.%d, label %main.%d, label %main.%d
BasicBlock *bb_0 = BasicBlock::Create(C, 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::getInt8Ty(C)), 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();
}
}
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