def insert_allocations(func, env):
b = Builder(func)
# IR positions and list of ops
positions = dict((op, idx) for idx, op in enumerate(func.ops))
oplist = list(func.ops)
for op in func.ops:
if op.opcode == 'ckernel':
ckernel, args = op.args
alloc = Op('alloc', op.type, args=[])
# TODO: Insert alloc in args list of ckernel
# Replace uses of ckernel with temporary allocation
op.replace_uses(alloc)
op.set_args([ckernel, [alloc] + args])
# Emit allocation before first use
b.position_before(op)
b.emit(alloc)
# Emit deallocation after last use, unless we are returning
# the result
idx = max(positions[u] for u in func.uses[alloc])
last_op = oplist[idx]
if not last_op.opcode == 'ret':
b.position_after(last_op)
dealloc = Op('dealloc', types.Void, [alloc])
b.emit(dealloc)
return func, env
def explicit_coercions(func, env=None):
"""
Turn implicit coercions into explicit conversion operations.
"""
conversions = {}
b = Builder(func)
for op in func.ops:
if op.opcode != 'kernel':
continue
overload = op.metadata['overload']
signature = overload.resolved_sig
parameters = signature.parameters[:-1]
assert len(op.args) - 1 == len(parameters)
# -------------------------------------------------
# Identify conversion points
replacements = {} # { arg : replacement_conversion }
for arg, param_type in zip(op.args[1:], parameters):
if arg.type != param_type:
conversion = conversions.get((arg, param_type))
if not conversion:
conversion = Op('convert', param_type, [arg])
b.position_after(arg)
b.emit(conversion)
conversions[arg, param_type] = conversion
replacements[arg] = conversion
# -------------------------------------------------
op.replace_args(replacements)
def split_critical_edges(func, cfg, phis):
"""
Split critical edges to correctly handle cycles in phis. See 2) above.
"""
b = Builder(func)
for block in cfg.node:
successors = cfg.neighbors(block)
if len(successors) > 1:
# More than one successor, we need to split
# (Alternatively, we could move our copies into the successor block
# if we were the only predecessor, but this seems simpler)
# Split successors with phis
new_succs = {} # old_successor -> new_successor
for succ in successors:
if phis[succ]:
label = func.temp("split_critical")
new_succ = func.new_block(label, after=block)
new_succs[succ] = new_succ
b.position_at_end(new_succ)
b.jump(succ)
# Patch our basic-block terminator to point to new blocks
if new_succs:
terminator = block.terminator
assert terminator.opcode == 'cbranch', terminator
test, truebb, falsebb = terminator.args
terminator.set_args([test,
new_succs.get(truebb, truebb),
new_succs.get(falsebb, falsebb)])
def initialize(self):
"""Initialize pykit untypes structures"""
# Setup Function
sig = types.Function(types.Opaque, [types.Opaque] * len(self.argnames),
False)
self.dst = Function(func_name(self.func), self.argnames, sig)
# Setup Builder
self.builder = Builder(self.dst)
# Setup Blocks
for offset in self.bytecode.labels:
name = blockname(self.func, offset)
block = self.dst.new_block(name)
self.blocks[offset] = block
self.stacks[block] = []
# Setup Variables
self.builder.position_at_beginning(self.dst.startblock)
for varname in self.varnames:
stackvar = self.builder.alloca(types.Pointer(types.Opaque),
result=self.dst.temp(varname))
self.allocas[varname] = stackvar
# Initialize function arguments
if varname in self.argnames:
self.builder.store(self.dst.get_arg(varname), stackvar)
def rewrite_setattr(func, env):
"""
Resolve missing attributes through __setattr__
"""
context = env['flypy.typing.context']
b = Builder(func)
for op in func.ops:
if op.opcode == 'setfield':
obj, attr, value = op.args
obj_type = context[obj]
attr_type = types.String[()]
if attr not in obj_type.fields and attr not in obj_type.layout:
assert SETATTR in obj_type.fields, attr
b.position_after(op)
# Construct attribute string
attr_string = OConst(attr)
# call(getfield(obj, '__setattr__'), ['attr', value])
method_type = make_method(obj_type, SETATTR)
method = b.getfield(ptypes.Opaque, obj, SETATTR)
call = b.call(ptypes.Opaque, method, [attr_string, value])
op.delete()
# Update context
del context[op]
context[method] = method_type
context[call] = types.Void[()]
context[attr_string] = attr_type
def insert_phis(func, cfg, allocas):
"""Insert φs in the function given the set of promotable stack variables"""
builder = Builder(func)
phis = {} # phi -> alloca
for block in func.blocks:
if len(cfg.predecessors(block)) > 1:
with builder.at_front(block):
for alloca in allocas:
phi = builder.phi(alloca.type.base, [], [])
phis[phi] = alloca
return phis
def rewrite_lowlevel_constants(func, env):
"""
Rewrite constant pointers.
"""
b = Builder(func)
b.position_at_beginning(func.startblock)
for op in func.ops:
constants = collect_constants(op)
new_constants = []
for c in constants:
new_constants.append(allocate_pointer_const(b, c))
substitute_args(op, constants, new_constants)
def test_exc_rewrite(self):
func = Function("foo", [], types.Function(types.Void, (), False))
entry = func.new_block("entry")
catch_block = func.new_block("catch")
b = Builder(func)
with b.at_front(entry):
b.exc_setup([catch_block])
b.exc_throw(Const(StopIteration, types.Exception))
with b.at_front(catch_block):
b.exc_catch([Const(Exception, types.Exception)])
local_exceptions.run(func, {})
self.assertNotIn('exc_throw', opcodes(func))
def visit_FuncDef(self, node):
assert not node.param_decls
self.enter_func()
name = node.decl.name
type = self.visit(node.decl.type)
argnames = [p.name for p in node.decl.type.args.params]
self.func = Function(name, argnames, type)
self.func.add_block('entry')
self.builder = Builder(self.func)
self.builder.position_at_end(self.func.blocks[0])
self.generic_visit(node.body)
self.leave_func()
def move_generator(func, consumer, empty_body):
gen = consumer.generator
gen.unlink()
b = Builder(func)
b.position_at_end(empty_body)
b.emit(gen)
with b.at_end(empty_body):
loop_exit = determine_loop_exit(consumer.loop)
b.jump(loop_exit)
def inline(func, call):
"""
Inline the call instruction into func.
:return: { old_op : new_op }
"""
callee = call.args[0]
callblock = call.block
# assert_inlinable(func, call, callee, uses)
builder = Builder(func)
builder.position_before(call)
inline_header, inline_exit = builder.splitblock()
new_callee, valuemap = copy_function(callee, temper=func.temp)
result = rewrite_return(new_callee)
# Fix up arguments
for funcarg, arg in zip(new_callee.args, call.args[1]):
funcarg.replace_uses(arg)
# Copy blocks
new_blocks = list(new_callee.blocks)
after = inline_header
for block in new_blocks:
block.parent = None
func.add_block(block, after=after)
after = block
# Fix up wiring
builder.jump(new_callee.startblock)
with builder.at_end(new_callee.exitblock):
builder.jump(inline_exit)
stretch_exception_block(builder, callblock, new_blocks)
# Fix up final result of call
if result is not None:
# non-void return
result.unlink()
result.result = call.result
call.replace(result)
else:
call.delete()
func.reset_uses()
#verify(func)
return valuemap
def detach_loop(func, consumer):
loop, iter = consumer.loop, consumer.iter
for block in loop.blocks:
func.del_block(block)
func.reset_uses()
b = Builder(func)
jump = iter.block.terminator
assert jump.opcode == 'jump' and jump.args[0] == loop.head
jump.delete()
b.position_at_end(iter.block)
_, newblock = b.splitblock(terminate=True)
return newblock
class RuntimeLowering(object):
"""
Lower assembly Operations into runtime calls, e.g.
Op("thread_start") -> Op("call", "thread_start", [])
"""
def __init__(self, func):
self.mod = func.module
self.builder = Builder(func)
self.func = func
def lower_ops_into_runtime(self, names, insert_decl=False):
"""Lower all ops listed in `names` into runtime calls"""
names = set(names)
for op in self.func.ops:
if op.opcode in names:
self.lower_into_runtime(op, insert_decl)
def lower_into_runtime(self, op, insert_decl=False):
"""
Lower op into a runtime call.
:param decl: Whether to insert an external declaration if not present
"""
_verify_args(op)
if insert_decl and not self.mod.get_global(op.opcode):
signature = types.Function(op.type, [arg.type for arg in op.args],
False)
self.mod.add_global(
GlobalValue(op.opcode, signature, external=True))
call = self.builder.gen_call_external(op.opcode, op.args, op.result)
op.replace(call)
class TestIR(unittest.TestCase):
def setUp(self):
self.m = from_c(source)
self.f = self.m.get_function('testfunc')
self.b = Builder(self.f)
def test_replace(self):
entry = self.f.get_block('entry')
for op in entry:
if op.opcode == ops.convert:
r, = op.args
t = self.b.add(types.Int32, [r, r])
c = self.b.convert(types.Float32, [t], result=op.result)
op.replace([t, c])
break
cfa.run(self.f)
self.assertEqual(opcodes(self.f), ['mul', 'add', 'convert', 'ret'])
class TestInterp(unittest.TestCase):
def setUp(self):
self.f = from_assembly(testfunc)
self.b = Builder(self.f)
def test_replace(self):
entry = self.f.get_block('entry')
for op in entry:
if op.opcode == ops.convert:
r, = op.args
t = self.b.add(types.Int32, [r, r], result="temp")
c = self.b.convert(types.Float32, [t], result=op.result)
op.replace([t, c])
break
result = [(op.opcode, op.result) for op in entry]
assert result == [('alloca', '0'), ('mul', 'r'), ('add', 'temp'),
('convert', '1'), ('store', '2'), ('load', '3'),
('ret', '4')]
def rewrite_raise_exc_type(func, env):
"""
Rewrite 'raise Exception' to 'raise Exception()'
"""
context = env['flypy.typing.context']
b = Builder(func)
for op in func.ops:
if op.opcode == 'exc_throw':
[exc_type] = op.args
if isinstance(exc_type, Const):
ty = context[exc_type]
if ty.impl == Type: # Type[Exception[]]
# Generate constructor application
b.position_before(op)
exc_obj = b.call(ptypes.Opaque, exc_type, [])
op.set_args([exc_obj])
type = ty.parameters[0]
context[exc_obj] = type
def visit_FuncDef(self, node):
assert not node.param_decls
self.enter_func()
name = node.decl.name
type = self.visit(node.decl.type)
if node.decl.type.args:
argnames = [p.name or "" for p in node.decl.type.args.params]
else:
argnames = []
self.func = Function(name, argnames, type)
self.func.new_block('entry')
self.builder = Builder(self.func)
self.builder.position_at_end(self.func.startblock)
# Store arguments in stack variables
for argname in argnames:
self.assignvar(argname, self.func.get_arg(argname))
self.generic_visit(node.body)
self.leave_func()
def explicit_coercions(func, env=None):
"""
Turn implicit coercions into explicit conversion operations.
"""
conversions = {}
b = Builder(func)
for op in func.ops:
if op.opcode != 'kernel':
continue
overload = op.metadata['overload']
signature = overload.resolved_sig
parameters = signature.parameters[:-1]
assert len(op.args) - 1 == len(parameters)
# -------------------------------------------------
# Identify conversion points
replacements = {} # { arg : replacement_conversion }
for arg, param_type in zip(op.args[1:], parameters):
if arg.type != param_type:
conversion = conversions.get((arg, param_type))
if not conversion:
conversion = Op('convert', param_type, [arg])
b.position_after(arg)
b.emit(conversion)
conversions[arg, param_type] = conversion
replacements[arg] = conversion
# -------------------------------------------------
op.replace_args(replacements)
def split_critical_edges(func, cfg, phis):
"""
Split critical edges to correctly handle cycles in phis. See 2) above.
"""
b = Builder(func)
for block in cfg.node:
successors = cfg.neighbors(block)
if len(successors) > 1:
# More than one successor, we need to split
# (Alternatively, we could move our copies into the successor block
# if we were the only predecessor, but this seems simpler)
# Split successors with phis
new_succs = {} # old_successor -> new_successor
for succ in successors:
if phis[succ]:
label = func.temp("split_critical")
new_succ = func.new_block(label, after=block)
new_succs[succ] = new_succ
b.position_at_end(new_succ)
b.jump(succ)
# Patch our basic-block terminator to point to new blocks
if new_succs:
terminator = block.terminator
assert terminator.opcode == 'cbranch', terminator
test, truebb, falsebb = terminator.args
terminator.set_args([
test,
new_succs.get(truebb, truebb),
new_succs.get(falsebb, falsebb)
])
def rewrite_setattr(func, env):
"""
Resolve missing attributes through __setattr__
"""
context = env['flypy.typing.context']
b = Builder(func)
for op in func.ops:
if op.opcode == 'setfield':
obj, attr, value = op.args
obj_type = context[obj]
attr_type = types.String[()]
if attr not in obj_type.fields and attr not in obj_type.layout:
assert SETATTR in obj_type.fields, attr
b.position_after(op)
# Construct attribute string
attr_string = OConst(attr)
# call(getfield(obj, '__setattr__'), ['attr', value])
method_type = make_method(obj_type, SETATTR)
method = b.getfield(ptypes.Opaque, obj, SETATTR)
call = b.call(ptypes.Opaque, method, [attr_string, value])
op.delete()
# Update context
del context[op]
context[method] = method_type
context[call] = types.Void[()]
context[attr_string] = attr_type
def move_allocas(func, allocas):
"""Move all allocas to the start block"""
builder = Builder(func)
builder.position_at_beginning(func.startblock)
for alloca in allocas:
if alloca.block != func.startblock:
alloca.unlink()
builder.emit(alloca)
def simplify_exceptions(func, env=None):
"""
Rewrite exceptions emitted by the front-end:
exc_end -> split block
"""
b = Builder(func)
for op in func.ops:
if op.opcode == 'exc_end':
b.position_after(op)
b.splitblock(terminate=True, preserve_exc=False)
op.delete()
def lower_fields(func, env):
b = Builder(func)
opbuilder = OpBuilder()
for op in func.ops:
if op.opcode not in ("getfield", "setfield"):
continue
if op.args[0].type.is_pointer:
b.position_before(op)
# Load the pointer and update the argument
p = op.args[0]
load = b.load(p)
args = [load] + op.args[1:]
op.set_args(args)
if op.opcode == "setfield":
# Write back result
b.position_after(op)
op.type = load.type
b.store(op, p)
if op.opcode == "getfield":
struct, attr = op.args
newop = opbuilder.extractfield(op.type,
struct,
attr,
result=op.result)
else:
struct, attr, value = op.args
newop = opbuilder.insertfield(op.type,
struct,
attr,
value,
result=op.result)
op.replace(newop)
def preserve_exceptions(oldblock, newblock):
"""
Preserve exc_setup instructions for block splits.
"""
from pykit.ir import Builder
func = oldblock.parent
b = Builder(func)
b.position_at_beginning(newblock)
for op in oldblock.leaders:
if op.opcode == 'exc_setup':
b.exc_setup(op.args[0], **op.metadata)
def from_expr(graph, expr_context, env):
"""
Map a Blaze expression graph to blaze AIR
Parameters
----------
graph: blaze.expr.Op
Expression graph
expr_context: ExprContext
Context of the expression
ctx: ExecutionContext
"""
inputs = expr_context.params
# -------------------------------------------------
# Types
argtypes = [operand.dshape for operand in inputs]
signature = types.Function(graph.dshape, argtypes, varargs=False)
# -------------------------------------------------
# Setup function
name = "expr"
argnames = ["e%d" % i for i in range(len(inputs))]
f = Function(name, argnames, signature)
builder = Builder(f)
builder.position_at_beginning(f.new_block('entry'))
# -------------------------------------------------
# Generate function
valuemap = dict(
(expr, f.get_arg("e%d" % i)) for i, expr in enumerate(inputs))
_from_expr(graph, f, builder, valuemap)
retval = valuemap[graph]
builder.ret(retval)
# Update environment with runtime arguments
runtime_args = [expr_context.terms[input] for input in inputs]
env['runtime.args'] = dict(zip(f.args, runtime_args))
return f
def rewrite_varargs(func, env):
"""
Rewrite function application with arguments that go in the varargs:
def f(x, *args):
...
call(f, [x, y, z]) -> call(f, [x, (y, z)])
"""
b = Builder(func)
caller = Caller(b, env['flypy.typing.context'], env)
caller = Caller(b, env['flypy.typing.context'], env)
call_flags = env['flypy.state.call_flags']
def f(context, py_func, f_env, op):
f, args = op.args
flags = call_flags.get(op, {})
if flags.get('varargs'):
return
# Retrieve any remaining arguments meant for *args
flattened = flatargs(py_func, args, {})
if flattened.have_varargs:
b.position_before(op)
#print(py_func, flattened.varargs)
# -- Build the tuple -- #
result = caller.apply_constructor(EmptyTuple)
for item in flattened.varargs:
result = caller.apply_constructor(StaticTuple,
args=[item, result])
# -- Patch callsite -- #
args = list(flattened.positional) + [result]
op.set_args([f, args])
jitcallmap(f, func, env)
def splitblock(block, trailing, name=None, terminate=False, preserve_exc=True):
"""Split the current block, returning (old_block, new_block)"""
func = block.parent
if block.is_terminated():
successors = deduce_successors(block)
else:
successors = []
# -------------------------------------------------
# Sanity check
# Allow splitting only after leaders and before terminator
# TODO: error check
# -------------------------------------------------
# Split
blockname = name or func.temp('Block')
newblock = func.new_block(blockname, after=block)
# -------------------------------------------------
# Move ops after the split to new block
for op in trailing:
op.unlink()
newblock.extend(trailing)
if terminate and not block.is_terminated():
# Terminate
b = Builder(func)
b.position_at_end(block)
b.jump(newblock)
# Update phis and preserve exception blocks
patch_phis(block, newblock, successors)
if preserve_exc:
preserve_exceptions(block, newblock)
return block, newblock
def rewrite_getattr(func, env):
"""
Resolve missing attributes through __getattr__
"""
context = env['flypy.typing.context']
b = OpBuilder()
builder = Builder(func)
for op in func.ops:
if op.opcode == 'getfield':
value, attr = op.args
obj_type = context[value]
attr_type = types.String[()]
if attr not in obj_type.fields and attr not in obj_type.layout:
assert '__getattr__' in obj_type.fields
op.set_args([value, '__getattr__'])
# Construct attribute string
attr_string = OConst(attr)
# Retrieve __getattr__ function and type
getattr_func, func_type, restype = infer_getattr(
obj_type, op, env)
# call(getfield(obj, '__getattr__'), ['attr'])
call = b.call(op.type, op, [attr_string])
op.replace_uses(call)
builder.position_after(op)
builder.emit(call)
# Update context
context[op] = func_type
context[attr_string] = attr_type
context[call] = restype
def __init__(self, func):
self.mod = func.module
self.builder = Builder(func)
self.func = func
def run(func, env=None, return_block=None):
"""
Rewrite 'ret' operations into jumps to a return block and assignments
to a return variable.
"""
b = Builder(func)
return_block = return_block or func.new_block("pykit.return")
# Allocate return variable
if not func.type.restype.is_void:
with b.at_front(func.startblock):
return_var = b.alloca(types.Pointer(func.type.restype), [])
b.store(Undef(func.type.restype), return_var)
else:
return_var = None
# Repace 'ret' instructions with jumps and assignments
for op in func.ops:
if op.opcode == "ret":
b.position_after(op)
if return_var:
b.store(op.args[0], return_var)
b.jump(return_block)
op.delete()
with b.at_end(return_block):
if return_var:
result = b.load(return_var.type.base, [return_var])
else:
result = None
b.ret(result)
def consume_yields(func, consumer, generator_func, valuemap):
b = Builder(func)
copier = lambda x: x
loop = consumer.loop
inlined_values = set(valuemap.values())
for block in func.blocks:
if block in inlined_values:
for op in block.ops:
if op.opcode == 'yield':
# -- Replace 'yield' by the loop body -- #
b.position_after(op)
_, resume = b.splitblock()
# Copy blocks
blocks = [copier(block) for block in loop.blocks]
# Insert blocks
prev = op.block
for block in blocks:
func.add_block(block, after=prev)
prev = block
# Fix wiring
b.jump(blocks[0])
b.position_at_end(blocks[-1])
b.jump(resume)
# We just introduced a bunch of copied blocks
func.reset_uses()
# Update phis with new predecessor
b.replace_predecessor(loop.tail, op.block, loop.head)
b.replace_predecessor(loop.tail, op.block, loop.head)
# Replace next() by value produced by yield
value = op.args[0]
consumer.next.replace_uses(value)
op.delete()
# We don't need these anymore
consumer.next.delete()
def setUp(self):
self.m = from_c(source)
self.f = self.m.get_function('testfunc')
self.b = Builder(self.f)
class PykitIRVisitor(c_ast.NodeVisitor):
"""
Map pykit IR in the form of polymorphic C to in-memory pykit IR.
int function(float x) {
int i = 0; /* I am a comment */
while (i < 10) { /*: { "unroll": true } :*/
x = call_external("sqrt", x * x);
}
return (int) x;
}
Attributes:
"""
in_function = False
def __init__(self, type_env=None):
self.mod = Module()
self.type_env = type_env or {}
self.func = None
self.builder = None
self.local_vars = None
self.allocas = None
self.global_vars = {}
self.functions = {}
# ______________________________________________________________________
@property
def vars(self):
if self.in_function:
return self.local_vars
else:
return self.global_vars
def enter_func(self):
self.in_function = True
self.local_vars = {}
self.allocas = {}
def leave_func(self):
self.in_function = False
self.mod.add_function(self.func)
self.local_vars = None
self.allocas = None
self.func = None
def visit(self, node, type=None):
"""
Visit a node.
:type: Whether we have a type for this opcode, which is an LHS type
or a cast. E.g.:
(Int) call(...) // cast
result = call(...) // assmnt, assuming 'result' is declared
result = call(..., call(...)) // second 'call' isn't typed
"""
self.type = type
method = 'visit_' + node.__class__.__name__
visitor = getattr(self, method, self.generic_visit)
# if visitor is None:
# raise SyntaxError(
# "Node %s not supported in %s:%s" % (node, node.coord.file,
# node.coord.line))
return visitor(node)
def visitif(self, node):
if node:
return self.visit(node)
def visits(self, node):
return list(map(self.visit, node))
# ______________________________________________________________________
def alloca(self, varname):
if varname not in self.allocas:
# Allocate variable with alloca
with self.builder.at_front(self.func.startblock):
type = types.Pointer(self.local_vars[varname])
result = self.func.temp(varname)
self.allocas[varname] = self.builder.alloca(type, [], result)
return self.allocas[varname]
def assignvar(self, varname, rhs):
self.builder.store(rhs, self.alloca(varname))
def assign(self, varname, rhs):
if self.in_function:
# Local variable
type = self.local_vars[varname]
self.assignvar(varname, self.visit(rhs, type=type))
else:
# Global variable
type = self.global_vars[varname]
self.mod.add_global(
GlobalValue(varname,
type=self.type,
value=self.visit(rhs, type=type)))
# ______________________________________________________________________
def visit_Decl(self, decl):
if decl.name in self.vars:
error(decl, "Var '%s' already declared!" % (decl.name, ))
type = self.visit(decl.type)
self.vars[decl.name] = type
if decl.init:
self.assign(decl.name, decl.init)
elif not self.in_function:
extern = decl.storage == 'external'
self.mod.add_global(GlobalValue(decl.name, type, external=extern))
return type
def visit_TypeDecl(self, decl):
return self.visit(decl.type)
visit_Typename = visit_TypeDecl
def visit_PtrDecl(self, decl):
return types.Pointer(self.visit(decl.type.type))
def visit_FuncDecl(self, decl):
if decl.args:
params = self.visits(decl.args.params)
else:
params = []
return types.Function(self.visit(decl.type), params)
def visit_IdentifierType(self, node):
name, = node.names
return self.type_env[name]
def visit_Typedef(self, node):
if node.name in ("Type", "_list"):
type = self.type_env[node.name]
else:
type = self.visit(node.type)
if type == types.Type:
type = getattr(types, node.name)
self.type_env[node.name] = type
return type
def visit_Template(self, node):
left = self.visit(node.left)
subtypes = self.visits(node.right)
if left is list:
return list(subtypes)
else:
assert issubclass(left, types.Type)
subtypes = self.visits(node.right)
return left(*subtypes)
# ______________________________________________________________________
def visit_FuncDef(self, node):
assert not node.param_decls
self.enter_func()
name = node.decl.name
type = self.visit(node.decl.type)
if node.decl.type.args:
argnames = [p.name or "" for p in node.decl.type.args.params]
else:
argnames = []
self.func = Function(name, argnames, type)
self.func.new_block('entry')
self.builder = Builder(self.func)
self.builder.position_at_end(self.func.startblock)
# Store arguments in stack variables
for argname in argnames:
self.assignvar(argname, self.func.get_arg(argname))
self.generic_visit(node.body)
self.leave_func()
# ______________________________________________________________________
def visit_FuncCall(self, node):
type = self.type
opcode = node.name.name
args = self.visits(node.args.exprs) if node.args else []
if opcode == "list":
return args
elif not type and not ops.is_void(opcode):
error(
node, "Expected a type for sub-expression "
"(add a cast or assignment)")
elif not hasattr(self.builder, opcode):
if opcode in self.mod.functions:
return self.builder.call(type,
[self.mod.get_function(opcode), args])
error(node, "No opcode %s" % (opcode, ))
buildop = getattr(self.builder, opcode)
if ops.is_void(opcode):
return buildop(*args)
else:
return buildop(type or "Unset", args)
def visit_ID(self, node):
if self.in_function:
if node.name in self.local_vars:
result = self.alloca(node.name)
return self.builder.load(result.type.base, [result])
global_val = (self.mod.get_function(node.name)
or self.mod.get_global(node.name))
if not global_val:
error(node, "Not a local or global: %r" % node.name)
return global_val
def visit_Cast(self, node):
type = self.visit(node.to_type)
if isinstance(node.expr, c_ast.FuncCall):
op = self.visit(node.expr, type=type)
op.type = type
return op
else:
result = self.visit(node.expr)
if result.type == type:
return result
return self.builder.convert(type, [result])
def visit_Assignment(self, node):
if node.op != '=':
error(node, "Only assignment with '=' is supported")
if not isinstance(node.lvalue, c_ast.ID):
error(node, "Canot only assign to a name")
self.assign(node.lvalue.name, node.rvalue)
def visit_Constant(self, node):
type = self.type_env[node.type]
const = types.convert(node.value, types.resolve_typedef(type))
if isinstance(const, basestring):
const = const[1:-1] # slice away quotes
return Const(const)
def visit_UnaryOp(self, node):
op = defs.unary_defs[node.op]
buildop = getattr(self.builder, op)
arg = self.visit(node.expr)
type = self.type or arg.type
return buildop(type, [arg])
def visit_BinaryOp(self, node):
op = binary_defs[node.op]
buildop = getattr(self.builder, op)
left, right = self.visits([node.left, node.right])
type = self.type
if not type:
l, r = map(types.resolve_typedef, [left.type, right.type])
assert l == r, (l, r)
if node.op in defs.compare_defs:
type = types.Bool
return buildop(type or left.type, [left, right])
def visit_If(self, node):
cond = self.visit(node.cond)
ifpos, elsepos, exit_block = self.builder.ifelse(cond)
with ifpos:
self.visit(node.iftrue)
self.builder.jump(exit_block)
with elsepos:
if node.iffalse:
self.visit(node.iffalse)
self.builder.jump(exit_block)
self.builder.position_at_end(exit_block)
def _loop(self, init, cond, next, body):
_, exit_block = self.builder.splitblock(self.func.temp("exit"))
_, body_block = self.builder.splitblock(self.func.temp("body"))
_, cond_block = self.builder.splitblock(self.func.temp("cond"))
self.visitif(init)
self.builder.jump(cond_block)
with self.builder.at_front(cond_block):
cond = self.visit(cond, type=types.Bool)
self.builder.cbranch(cond, body_block, exit_block)
with self.builder.at_front(body_block):
self.visit(body)
self.visitif(next)
bb = self.builder.basic_block
if not bb.tail or not ops.is_terminator(bb.tail.opcode):
self.builder.jump(cond_block)
self.builder.position_at_end(exit_block)
def visit_While(self, node):
self._loop(None, node.cond, None, node.stmt)
def visit_For(self, node):
# avoid silly 2to3 rewrite to 'node.__next__'
next = getattr(node, 'next')
self._loop(node.init, node.cond, next, node.stmt)
def visit_Return(self, node):
b = self.builder
value = self.visit(node.expr)
t = self.func.temp
b.ret(b.convert(self.func.type.restype, [value]))
