You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
4.3 KiB
138 lines
4.3 KiB
import ast
|
|
import functools
|
|
import inspect
|
|
from textwrap import dedent
|
|
from typing import Any, List, NamedTuple, Optional, Tuple
|
|
|
|
from torch._C import ErrorReport
|
|
from torch._C._jit_tree_views import SourceRangeFactory
|
|
|
|
|
|
def get_source_lines_and_file(
|
|
obj: Any,
|
|
error_msg: Optional[str] = None,
|
|
) -> Tuple[List[str], int, Optional[str]]:
|
|
"""
|
|
Wrapper around inspect.getsourcelines and inspect.getsourcefile.
|
|
|
|
Returns: (sourcelines, file_lino, filename)
|
|
"""
|
|
filename = None # in case getsourcefile throws
|
|
try:
|
|
filename = inspect.getsourcefile(obj)
|
|
sourcelines, file_lineno = inspect.getsourcelines(obj)
|
|
except OSError as e:
|
|
msg = (
|
|
f"Can't get source for {obj}. TorchScript requires source access in "
|
|
"order to carry out compilation, make sure original .py files are "
|
|
"available."
|
|
)
|
|
if error_msg:
|
|
msg += "\n" + error_msg
|
|
raise OSError(msg) from e
|
|
|
|
return sourcelines, file_lineno, filename
|
|
|
|
|
|
def normalize_source_lines(sourcelines: List[str]) -> List[str]:
|
|
"""
|
|
This helper function accepts a list of source lines. It finds the
|
|
indentation level of the function definition (`def`), then it indents
|
|
all lines in the function body to a point at or greater than that
|
|
level. This allows for comments and continued string literals that
|
|
are at a lower indentation than the rest of the code.
|
|
Args:
|
|
sourcelines: function source code, separated into lines by
|
|
the '\n' character
|
|
Returns:
|
|
A list of source lines that have been correctly aligned
|
|
"""
|
|
|
|
def remove_prefix(text, prefix):
|
|
return text[text.startswith(prefix) and len(prefix) :]
|
|
|
|
# Find the line and line number containing the function definition
|
|
idx = None
|
|
for i, l in enumerate(sourcelines):
|
|
if l.lstrip().startswith("def"):
|
|
idx = i
|
|
break
|
|
|
|
# This will happen when the function is a lambda- we won't find "def" anywhere in the source
|
|
# lines in that case. Currently trying to JIT compile a lambda will throw an error up in
|
|
# `parse_def()`, but we might want to handle this case in the future.
|
|
if idx is None:
|
|
return sourcelines
|
|
|
|
# Get a string representing the amount of leading whitespace
|
|
fn_def = sourcelines[idx]
|
|
whitespace = fn_def.split("def")[0]
|
|
|
|
# Add this leading whitespace to all lines before and after the `def`
|
|
aligned_prefix = [
|
|
whitespace + remove_prefix(s, whitespace) for s in sourcelines[:idx]
|
|
]
|
|
aligned_suffix = [
|
|
whitespace + remove_prefix(s, whitespace) for s in sourcelines[idx + 1 :]
|
|
]
|
|
|
|
# Put it together again
|
|
aligned_prefix.append(fn_def)
|
|
return aligned_prefix + aligned_suffix
|
|
|
|
|
|
# Thin wrapper around SourceRangeFactory to store extra metadata
|
|
# about the function-to-be-compiled.
|
|
class SourceContext(SourceRangeFactory):
|
|
def __init__(
|
|
self,
|
|
source,
|
|
filename,
|
|
file_lineno,
|
|
leading_whitespace_len,
|
|
uses_true_division=True,
|
|
funcname=None,
|
|
):
|
|
super().__init__(source, filename, file_lineno, leading_whitespace_len)
|
|
self.uses_true_division = uses_true_division
|
|
self.filename = filename
|
|
self.funcname = funcname
|
|
|
|
|
|
@functools.lru_cache(maxsize=None)
|
|
def make_source_context(*args):
|
|
return SourceContext(*args)
|
|
|
|
|
|
def fake_range():
|
|
return SourceContext("", None, 0, 0).make_raw_range(0, 1)
|
|
|
|
|
|
class ParsedDef(NamedTuple):
|
|
ast: ast.Module
|
|
ctx: SourceContext
|
|
source: str
|
|
filename: Optional[str]
|
|
file_lineno: int
|
|
|
|
|
|
def parse_def(fn):
|
|
sourcelines, file_lineno, filename = get_source_lines_and_file(
|
|
fn, ErrorReport.call_stack()
|
|
)
|
|
sourcelines = normalize_source_lines(sourcelines)
|
|
source = "".join(sourcelines)
|
|
dedent_src = dedent(source)
|
|
py_ast = ast.parse(dedent_src)
|
|
if len(py_ast.body) != 1 or not isinstance(py_ast.body[0], ast.FunctionDef):
|
|
raise RuntimeError(
|
|
f"Expected a single top-level function: {filename}:{file_lineno}"
|
|
)
|
|
leading_whitespace_len = len(source.split("\n", 1)[0]) - len(
|
|
dedent_src.split("\n", 1)[0]
|
|
)
|
|
ctx = make_source_context(
|
|
source, filename, file_lineno, leading_whitespace_len, True, fn.__name__
|
|
)
|
|
return ParsedDef(py_ast, ctx, source, filename, file_lineno)
|