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Make division by zero raise an exception.

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This commit is contained in:
whitequark 2015-07-23 01:26:50 +03:00
parent 4cfe4ea148
commit f8c2709943
3 changed files with 24 additions and 13 deletions
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7
artiq/compiler/builtins.py
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@ -83,6 +83,10 @@ class TValueError(TException):
def __init__(self):
super().__init__("ValueError")
class TZeroDivisionError(TException):
def __init__(self):
super().__init__("ZeroDivisionError")
def fn_bool():
return types.TConstructor("bool")
@ -107,6 +111,9 @@ def fn_IndexError():
def fn_ValueError():
return types.TExceptionConstructor("ValueError")
def fn_ZeroDivisionError():
return types.TExceptionConstructor("ZeroDivisionError")
def fn_range():
return types.TBuiltinFunction("range")

25
artiq/compiler/prelude.py
View File

@ -7,16 +7,17 @@ from . import builtins
def globals():
return {
"bool": builtins.fn_bool(),
"int": builtins.fn_int(),
"float": builtins.fn_float(),
"list": builtins.fn_list(),
"range": builtins.fn_range(),
"Exception": builtins.fn_Exception(),
"IndexError": builtins.fn_IndexError(),
"ValueError": builtins.fn_ValueError(),
"len": builtins.fn_len(),
"round": builtins.fn_round(),
"print": builtins.fn_print(),
"syscall": builtins.fn_syscall(),
"bool": builtins.fn_bool(),
"int": builtins.fn_int(),
"float": builtins.fn_float(),
"list": builtins.fn_list(),
"range": builtins.fn_range(),
"Exception": builtins.fn_Exception(),
"IndexError": builtins.fn_IndexError(),
"ValueError": builtins.fn_ValueError(),
"ZeroDivisionError": builtins.fn_ZeroDivisionError(),
"len": builtins.fn_len(),
"round": builtins.fn_round(),
"print": builtins.fn_print(),
"syscall": builtins.fn_syscall(),
}

5
artiq/compiler/transforms/artiq_ir_generator.py
View File

@ -899,13 +899,16 @@ class ARTIQIRGenerator(algorithm.Visitor):
def visit_BinOpT(self, node):
if builtins.is_numeric(node.type):
# TODO: check for division by zero
rhs = self.visit(node.right)
if isinstance(node.op, (ast.LShift, ast.RShift)):
# Check for negative shift amount.
self._make_check(self.append(ir.Compare(ast.GtE(loc=None), rhs,
ir.Constant(0, rhs.type))),
lambda: self.append(ir.Alloc([], builtins.TValueError())))
elif isinstance(node.op, (ast.Div, ast.FloorDiv)):
self._make_check(self.append(ir.Compare(ast.NotEq(loc=None), rhs,
ir.Constant(0, rhs.type))),
lambda: self.append(ir.Alloc([], builtins.TZeroDivisionError())))
return self.append(ir.Arith(node.op, self.visit(node.left), rhs))
elif isinstance(node.op, ast.Add): # list + list, tuple + tuple