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CodeGenerator.py
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CodeGenerator.py
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import llvmlite.ir as ir
import llvmlite.binding as llvm
from llvmUtils import *
from decorators import addMethod
from Failure import CodegenError, CompilationFailure
from SymbolTable import SymbolTable
from Ast import *
from Type import *
class LLVMCodeGenerator:
standardLibraryFunctions = [
('formatInt', ir.FunctionType(
irCharPointerType(), [irIntType()], False)),
('formatDouble', ir.FunctionType(
irCharPointerType(), [irDoubleType()], False)),
('freeString', ir.FunctionType(
irVoidType(), [irCharPointerType()], False)),
('putLn', ir.FunctionType(
irVoidType(), [], False)),
('putStrLn', ir.FunctionType(
irVoidType(), [irCharPointerType()], False)),
('putVectorLn', ir.FunctionType(
irVoidType(), [irNVectorPointerType()], False)),
('putStr', ir.FunctionType(
irVoidType(), [irCharPointerType()], False)),
('zeros', ir.FunctionType(
irNVectorPointerType(), [irIntType(), irIntPointerType()], False)),
('ones', ir.FunctionType(
irNVectorPointerType(), [irIntType(), irIntPointerType()], False)),
('dotAdd', ir.FunctionType(
irNVectorPointerType(), [irNVectorPointerType(), irNVectorPointerType()], False)),
('dotMinus', ir.FunctionType(
irNVectorPointerType(), [irNVectorPointerType(), irNVectorPointerType()], False)),
('dotMult', ir.FunctionType(
irNVectorPointerType(), [irNVectorPointerType(), irNVectorPointerType()], False)),
('dotDiv', ir.FunctionType(
irNVectorPointerType(), [irNVectorPointerType(), irNVectorPointerType()], False)),
('assignValue', ir.FunctionType(
irVoidType(), [irNVectorPointerType(), irIntPointerType(), irIntType(), irDoubleType()], False)),
('readValue', ir.FunctionType(
irDoubleType(), [irNVectorPointerType(), irIntPointerType(), irIntType()], False)),
('literalNVector', ir.FunctionType(
irNVectorPointerType(), [irIntType(), irIntPointerType(), irDoublePointerType()], False))
]
def __init__(self):
self.module = ir.Module('Main')
self.symbolTable = SymbolTable()
self.builder = ir.IRBuilder()
self.globalNameGen = self.globalNameGenerator()
self.flags = {
'bind': False
}
def generateIR(self, ast: Ast):
# we should also generate declaration for standard library
for funcName, funcType in LLVMCodeGenerator.standardLibraryFunctions:
func = ir.Function(self.module, funcType, funcName)
self.symbolTable.put(funcName, func)
# declare extern NVector struct (empty it's defined in runtime library)
# start by generating main function
functionName = 'main'
functionType = ir.FunctionType(irIntType(), [], False)
func = ir.Function(self.module, functionType, functionName)
self.symbolTable.put(functionName, func)
entryBlock = func.append_basic_block('entry')
self.builder = ir.IRBuilder(entryBlock)
# traverse ast and generate code
ast.codegen(self)
retVal = ir.Constant(irIntType(), 0)
self.builder.ret(retVal)
return self.module
def raiseError(self, msg, lineno):
error = CodegenError(msg, lineno)
raise CompilationFailure('Code generation stage', [error])
def nextGlobalName(self):
return next(self.globalNameGen)
def globalNameGenerator(self):
s = 'global_'
counter = -1
while True:
counter += 1
yield s + str(counter)
@ addMethod(Ast)
def codegen(self: Ast, generator: LLVMCodeGenerator):
for child in self.children:
child.codegen(generator)
return None
@ addMethod(Bind)
def codegen(self: Bind, generator: LLVMCodeGenerator):
op = self.operator()
name = self.name()
expr = self.expression().codegen(generator)
if not generator.symbolTable.contains(name):
if isDouble(expr):
alloca = generator.builder.alloca(irDoubleType(), name=name)
elif isInt(expr):
alloca = generator.builder.alloca(irIntType(), name=name)
elif isString(expr):
alloca = generator.builder.alloca(
irCharPointerType(), name=name)
elif isVector(expr):
alloca = generator.builder.alloca(
irNVectorPointerType(), name=name)
else:
generator.raiseError(
f'Expected something different! {expr}', self.lineno)
else:
alloca = generator.symbolTable.get(name)
generator.builder.store(expr, alloca)
generator.symbolTable.put(name, alloca)
@addMethod(BindWithSlice)
def codegen(self: BindWithSlice, generator: LLVMCodeGenerator):
builder = generator.builder
op = self.operator()
expr = self.expression().codegen(generator)
generator.flags['bind'] = True
vPtr, arrPtr, arrSize = self.slicedVector().codegen(generator)
generator.flags['bind'] = False
if isInt(expr):
expr = builder.sitofp(expr)
if isDouble(expr):
fn = generator.symbolTable.get('assignValue')
builder.call(fn, [vPtr, arrPtr, arrSize, expr])
elif isVector(expr):
# todo handle slices...
pass
@addMethod(If)
def codegen(self: If, generator: LLVMCodeGenerator):
builder = generator.builder
cmp = self.condition().codegen(generator)
trueBlock = builder.function.append_basic_block('true-block')
falseBlock = ir.Block(builder.function, 'false-block')
mergedBlock = ir.Block(builder.function, 'merged')
builder.cbranch(cmp, trueBlock, falseBlock)
# true block
builder.position_at_start(trueBlock)
self.trueBlock().codegen(generator)
builder.branch(mergedBlock)
trueBlock = generator.builder.block
# false block (which just branches to merged section)
builder.function.basic_blocks.append(falseBlock)
builder.position_at_start(falseBlock)
builder.branch(mergedBlock)
falseBlock = generator.builder.block
builder.function.basic_blocks.append(mergedBlock)
builder.position_at_start(mergedBlock)
return mergedBlock
@addMethod(IfElse)
def codegen(self: IfElse, generator: LLVMCodeGenerator):
builder = generator.builder
cmp = self.condition().codegen(generator)
trueBlock = builder.function.append_basic_block('true-block')
falseBlock = ir.Block(builder.function, 'false-block')
mergedBlock = ir.Block(builder.function, 'merged')
builder.cbranch(cmp, trueBlock, falseBlock)
# true block
builder.position_at_start(trueBlock)
self.trueBlock().codegen(generator)
builder.branch(mergedBlock)
trueBlock = generator.builder.block
# false block
builder.function.basic_blocks.append(falseBlock)
builder.position_at_start(falseBlock)
self.falseBlock().codegen(generator)
builder.branch(mergedBlock)
falseBlock = generator.builder.block
builder.function.basic_blocks.append(mergedBlock)
builder.position_at_start(mergedBlock)
return mergedBlock
@addMethod(While)
def codegen(self: While, generator: LLVMCodeGenerator):
builder = generator.builder
conditionBlock = builder.function.append_basic_block(
'while-condition-block')
bodyBlock = ir.Block(builder.function, 'while-body-block')
mergedBlock = ir.Block(builder.function, 'while-merged')
builder.branch(conditionBlock)
# condition block
builder.position_at_start(conditionBlock)
cmp = self.condition().codegen(generator)
builder.cbranch(cmp, bodyBlock, mergedBlock)
conditionBlock = generator.builder.block
# body block
builder.function.basic_blocks.append(bodyBlock)
builder.position_at_start(bodyBlock)
self.body().codegen(generator)
builder.branch(conditionBlock)
conditionBlock = generator.builder.block
# merged section
builder.function.basic_blocks.append(mergedBlock)
builder.position_at_start(mergedBlock)
return mergedBlock
@addMethod(For)
def codegen(self: For, generator: LLVMCodeGenerator):
builder = generator.builder
initBlock = builder.function.append_basic_block(
'for-init-block')
conditionBlock = ir.Block(builder.function, 'for-condition')
bodyBlock = ir.Block(builder.function, 'for-body-block')
mergedBlock = ir.Block(builder.function, 'for-merged')
builder.branch(initBlock)
# init block
builder.position_at_start(initBlock)
left, right = self.range().codegen(generator)
name = self.id().name()
alloca = builder.alloca(irIntType(), name=name)
builder.store(left, alloca)
generator.symbolTable.put(name, alloca)
builder.branch(conditionBlock)
initBlock = generator.builder.block
# condition block
builder.function.basic_blocks.append(conditionBlock)
builder.position_at_start(conditionBlock)
current = builder.load(alloca)
current = generator.builder.sitofp(current, irDoubleType())
limit = generator.builder.sitofp(right, irDoubleType())
cmp = generator.builder.fcmp_unordered('<=', current, limit, 'for-cmp')
builder.cbranch(cmp, bodyBlock, mergedBlock)
conditionBlock = generator.builder.block
# body block
builder.function.basic_blocks.append(bodyBlock)
builder.position_at_start(bodyBlock)
self.body().codegen(generator)
current = builder.load(alloca)
current = builder.add(current, ir.Constant(irIntType(), 1))
builder.store(current, alloca)
builder.branch(conditionBlock)
conditionBlock = generator.builder.block
# merged block
builder.function.basic_blocks.append(mergedBlock)
builder.position_at_start(mergedBlock)
return mergedBlock
@addMethod(SlicedVector)
def codegen(self: SlicedVector, generator: LLVMCodeGenerator):
# All the cool stuff happens here:
# - allocating array on the stack
# - geps ...
# - calling runtime functions
builder = generator.builder
n = len(self.ranges())
arraySize = n * 3
arrTpe = intArrType(arraySize)
ptr = builder.alloca(arrTpe)
i = 0
singleReturn = True
for rng in self.ranges():
v = rng.codegen(generator)
if type(rng) is SimpleRange:
vPtr = gepArrayBuilder(builder, ptr, i)
builder.store(v, vPtr)
vPtr = gepArrayBuilder(builder, ptr, i + 1)
builder.store(v, vPtr)
elif type(rng) is Range:
left, right = v
vPtr = gepArrayBuilder(builder, ptr, i)
builder.store(left, vPtr)
vPtr = gepArrayBuilder(builder, ptr, i + 1)
builder.store(right, vPtr)
singleReturn = False
rangeId = intLiteral(rng.rangeTypeIdentifier())
vPtr = gepArrayBuilder(builder, ptr, i + 2)
builder.store(rangeId, vPtr)
i += 3
vecPtr = self.id().codegen(generator)
if generator.flags['bind'] is True:
if singleReturn is True:
rangesSize = intLiteral(arraySize)
ptr = gepArrayBuilder(builder, ptr, 0)
return vecPtr, ptr, rangesSize
else:
fn = generator.symbolTable.get('readValue')
rangesSize = intLiteral(arraySize)
ptr = gepArrayBuilder(builder, ptr, 0)
return builder.call(fn, [vecPtr, ptr, rangesSize])
@addMethod(SimpleRange)
def codegen(self: SimpleRange, generator: LLVMCodeGenerator):
idx = self.idx().codegen(generator)
if isDouble(idx):
idx = generator.builder.fptosi(idx)
return idx
@addMethod(FromStartRange)
def codegen(self: FromStartRange, generator: LLVMCodeGenerator):
right = self.end()
if isDouble(right):
right = generator.builder.fptosi(right)
return intLiteral(0), right
@addMethod(Range)
def codegen(self: Range, generator: LLVMCodeGenerator):
left, right = self.begin().codegen(generator), self.end().codegen(generator)
if isDouble(left):
left = generator.builder.fptosi(left)
if isDouble(right):
right = generator.builder.fptosi(right)
return left, right
@ addMethod(Identifier)
def codegen(self: Identifier, generator: LLVMCodeGenerator):
name = self.name()
if not generator.symbolTable.contains(name):
generator.raiseError(f'Identifier not defined: {name}!', self.lineno)
ptr = generator.symbolTable.get(name)
return generator.builder.load(ptr)
@ addMethod(BinaryOp)
def codegen(self: BinaryOp, generator: LLVMCodeGenerator):
"""
Emitting operations based on type of operands..
"""
op = self.operator()
left = self.left().codegen(generator)
right = self.right().codegen(generator)
if isVector(left) and isVector(right):
fname = None
if op == '+':
fname = 'dotAdd'
elif op == '-':
fname = 'dotMinus'
elif op == '*':
fname = 'dotMult'
elif op == '/':
fname = 'dotDiv'
fn = generator.symbolTable.get(fname)
return generator.builder.call(fn, [left, right])
if isInt(left) and isInt(right):
if op == '+':
return generator.builder.add(left, right, 'addTmp')
elif op == '-':
return generator.builder.sub(left, right, 'addTmp')
elif op == '*':
return generator.builder.mul(left, right, 'multTmp')
elif op == '/':
left = generator.builder.sitofp(left, irDoubleType())
right = generator.builder.sitofp(right, irDoubleType())
elif op in ['<', '<=', '>', '>=', '==', '!=']:
left = generator.builder.sitofp(left, irDoubleType())
right = generator.builder.sitofp(right, irDoubleType())
return generator.builder.fcmp_unordered(op, left, right, 'cmp')
if isInt(left) and isDouble(right):
left = generator.builder.sitofp(left, irDoubleType())
elif isDouble(left) and isInt(right):
right = generator.builder.sitofp(right, irDoubleType())
if op == '+':
return generator.builder.fadd(left, right, 'addTmp')
elif op == '-':
return generator.builder.fsub(left, right, 'addTmp')
elif op == '*':
return generator.builder.fmul(left, right, 'multTmp')
elif op == '/':
return generator.builder.fdiv(left, right, 'divTmp')
elif op in ['<', '<=', '>', '>=', '==', '!=']:
return generator.builder.fcmp_unordered(op, left, right, 'cmp')
@ addMethod(Vector)
def codegen(self: Vector, generator: LLVMCodeGenerator):
# flatten the vector by performing bfs
q = [self]
vals = []
dims = self.dimensions()
while len(q) > 0:
popped = q.pop()
if type(popped) is Vector:
for child in popped.children:
q.append(child)
else:
vals.append(popped)
list.reverse(vals)
valuesArrPtr = doubleArray(vals, generator)
dimensionsNumber = ir.Constant(irIntType(), int(len(dims)))
intArry = namedIntArrayLiteral(
generator.module, dims, generator.nextGlobalName())
dimensionsPtr = arrayPtr(intArry)
func = generator.symbolTable.get('literalNVector')
return generator.builder.call(func, [dimensionsNumber, dimensionsPtr, valuesArrPtr])
@ addMethod(Primitive)
def codegen(self: Primitive, generator: LLVMCodeGenerator):
if self.type == floatType:
return ir.Constant(irDoubleType(), float(self.value()))
elif self.type == intType:
return ir.Constant(irIntType(), int(self.value()))
elif self.type == stringType:
globName = generator.nextGlobalName()
glob = namedGlobalStringLiteral(
generator.module, str(self.value() + '\x00'), globName)
return arrayPtr(glob)
@ addMethod(CodeBlock)
def codegen(self: CodeBlock, generator: LLVMCodeGenerator):
generator.symbolTable.pushScope()
for node in self.children:
node.codegen(generator)
generator.symbolTable.popScope()
return irVoidType()
# ----------------------- Function Calls -----------------------------
def handlePrint(arg, generator: LLVMCodeGenerator):
arg = arg.codegen(generator)
if isDouble(arg) or isInt(arg):
if isDouble(arg):
formatFunc = generator.symbolTable.get('formatDouble')
elif isInt(arg):
formatFunc = generator.symbolTable.get('formatInt')
arg = generator.builder.call(formatFunc, [arg])
printFunc = generator.symbolTable.get('putStr')
generator.builder.call(printFunc, [arg])
freeStrFunc = generator.symbolTable.get('freeString')
generator.builder.call(freeStrFunc, [arg])
elif isString(arg):
printFunc = generator.symbolTable.get('putStr')
generator.builder.call(printFunc, [arg])
elif isVector(arg):
printFunc = generator.symbolTable.get('putVectorLn')
generator.builder.call(printFunc, [arg])
@ addMethod(FunctionCall)
def codegen(self: FunctionCall, generator: LLVMCodeGenerator):
name = self.functionName()
if name == 'print':
for arg in self.args():
handlePrint(arg, generator)
putLnFunction = generator.symbolTable.get('putLn')
return generator.builder.call(putLnFunction, [])
elif name == 'ones' or name == 'zeros':
n = ir.Constant(irIntType(), len(self.args()))
ints = intArray(self.args(), generator)
fn = generator.symbolTable.get(name)
return generator.builder.call(fn, [n, ints])
elif name in ['.+', '.-', '.*', './']:
fn = None
if name == '.+':
fn = generator.symbolTable.get('dotAdd')
elif name == '.-':
fn = generator.symbolTable.get('dotMinus')
elif name == '.*':
fn = generator.symbolTable.get('dotMult')
elif name == './':
fn = generator.symbolTable.get('dotDiv')
args = self.args()
one, other = args[0].codegen(generator), args[1].codegen(generator)
return generator.builder.call(fn, [one, other])
elif name == 'negative':
arg = self.args()[0].codegen(generator)
if isInt(arg):
return generator.builder.neg(arg)
elif isDouble(arg):
# This might not work!
return generator.builder.neg(arg)
else:
generator.raiseError(
f'Other functions are not yet implemented!', self.lineno)
#----------------- arrays required by runtime --------------------- #
def intArray(elements, generator: LLVMCodeGenerator):
builder = generator.builder
# Allocation in global data segment..
# -----------------------------------
# arrType = ir.ArrayType(irIntType(), len(elements))
# glob = ir.GlobalVariable(generator.module, arrType,
# generator.nextGlobalName())
# glob.initializer = intArrayInitializer(len(elements))
# calculate index and gep!
# for i, e in enumerate(elements):
# v = e.codegen(generator)
# if isDouble(v):
# v = builder.fptosi(v, irIntType())
# ptr = gepArrayBuilder(builder, glob, i)
# store = builder.store(v, ptr)
# return arrayPtr(glob)
# Allocation on the stack..
# -----------------------------------
arrTpe = intArrType(len(elements))
ptr = builder.alloca(arrTpe)
for i, e in enumerate(elements):
v = e.codegen(generator)
if isDouble(v):
v = builder.fptosi(v, irIntType())
vPtr = gepArrayBuilder(builder, ptr, i)
store = builder.store(v, vPtr)
return gepArrayBuilder(builder, ptr, 0)
def doubleArray(elements, generator: LLVMCodeGenerator):
builder = generator.builder
arrType = ir.ArrayType(irDoubleType(), len(elements))
glob = ir.GlobalVariable(generator.module, arrType,
generator.nextGlobalName())
glob.initializer = doubleArrayInitializer(len(elements))
# calculate index and gep!
for i, e in enumerate(elements):
v = e.codegen(generator)
if isInt(v):
v = builder.sitofp(v, irDoubleType())
ptr = gepArrayBuilder(builder, glob, i)
store = builder.store(v, ptr)
return arrayPtr(glob)