def split_blocks_at_errors(blocks: List[BasicBlock],
default_error_handler: BasicBlock,
func_name: Optional[str]) -> List[BasicBlock]:
new_blocks = [] # type: List[BasicBlock]
# First split blocks on ops that may raise.
for block in blocks:
ops = block.ops
block.ops = []
cur_block = block
new_blocks.append(cur_block)
# If the block has an error handler specified, use it. Otherwise
# fall back to the default.
error_label = block.error_handler or default_error_handler
block.error_handler = None
for op in ops:
target = op # type: Value
cur_block.ops.append(op)
if isinstance(op, RegisterOp) and op.error_kind != ERR_NEVER:
# Split
new_block = BasicBlock()
new_blocks.append(new_block)
if op.error_kind == ERR_MAGIC:
# Op returns an error value on error that depends on result RType.
variant = Branch.IS_ERROR
negated = False
elif op.error_kind == ERR_FALSE:
# Op returns a C false value on error.
variant = Branch.BOOL
negated = True
elif op.error_kind == ERR_ALWAYS:
variant = Branch.BOOL
negated = True
# this is a hack to represent the always fail
# semantics, using a temporary bool with value false
target = Integer(0, bool_rprimitive)
else:
assert False, 'unknown error kind %d' % op.error_kind
# Void ops can't generate errors since error is always
# indicated by a special value stored in a register.
if op.error_kind != ERR_ALWAYS:
assert not op.is_void, "void op generating errors?"
branch = Branch(target,
true_label=error_label,
false_label=new_block,
op=variant,
line=op.line)
branch.negated = negated
if op.line != NO_TRACEBACK_LINE_NO and func_name is not None:
branch.traceback_entry = (func_name, op.line)
cur_block.ops.append(branch)
cur_block = new_block
return new_blocks
def test_get_attr_merged(self) -> None:
op = GetAttr(self.r, 'y', 1)
branch = Branch(op, BasicBlock(8), BasicBlock(9), Branch.IS_ERROR)
branch.traceback_entry = ('foobar', 123)
self.assert_emit(op,
"""\
cpy_r_r0 = ((mod___AObject *)cpy_r_r)->_y;
if (unlikely(cpy_r_r0 == CPY_INT_TAG)) {
CPy_AttributeError("prog.py", "foobar", "A", "y", 123, CPyStatic_prog___globals);
goto CPyL8;
}
CPyTagged_INCREF(cpy_r_r0);
goto CPyL9;
""",
next_branch=branch)
def test_cast_and_branch_no_merge_3(self) -> None:
op = Cast(self.r, dict_rprimitive, 1)
next_block = BasicBlock(9)
branch = Branch(op, BasicBlock(8), next_block, Branch.BOOL)
branch.traceback_entry = ('foobar', 123)
self.assert_emit(
op,
"""\
if (likely(PyDict_Check(cpy_r_r)))
cpy_r_r0 = cpy_r_r;
else {
CPy_TypeError("dict", cpy_r_r);
cpy_r_r0 = NULL;
}
""",
next_block=next_block,
next_branch=branch,
)
def test_cast_and_branch_merge(self) -> None:
op = Cast(self.r, dict_rprimitive, 1)
next_block = BasicBlock(9)
branch = Branch(op, BasicBlock(8), next_block, Branch.IS_ERROR)
branch.traceback_entry = ('foobar', 123)
self.assert_emit(
op,
"""\
if (likely(PyDict_Check(cpy_r_r)))
cpy_r_r0 = cpy_r_r;
else {
CPy_TypeErrorTraceback("prog.py", "foobar", 123, CPyStatic_prog___globals, "dict", cpy_r_r);
goto CPyL8;
}
""",
next_block=next_block,
next_branch=branch,
skip_next=True,
)