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diff.py
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diff.py
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#!/usr/bin/env python3
# PYTHON_ARGCOMPLETE_OK
import argparse
import sys
from typing import (
Any,
Callable,
Dict,
Iterator,
List,
Match,
NoReturn,
Optional,
Pattern,
Set,
Tuple,
Type,
Union,
)
def fail(msg: str) -> NoReturn:
print(msg, file=sys.stderr)
sys.exit(1)
def static_assert_unreachable(x: NoReturn) -> NoReturn:
raise Exception("Unreachable! " + repr(x))
# ==== COMMAND-LINE ====
if __name__ == "__main__":
# Prefer to use diff_settings.py from the current working directory
sys.path.insert(0, ".")
try:
import diff_settings
except ModuleNotFoundError:
fail("Unable to find diff_settings.py in the same directory.")
sys.path.pop(0)
try:
import argcomplete
except ModuleNotFoundError:
argcomplete = None
parser = argparse.ArgumentParser(description="Diff MIPS, PPC or AArch64 assembly.")
start_argument = parser.add_argument(
"start",
help="Function name or address to start diffing from.",
)
if argcomplete:
def complete_symbol(
prefix: str, parsed_args: argparse.Namespace, **kwargs: object
) -> List[str]:
if not prefix or prefix.startswith("-"):
# skip reading the map file, which would
# result in a lot of useless completions
return []
config: Dict[str, Any] = {}
diff_settings.apply(config, parsed_args) # type: ignore
mapfile = config.get("mapfile")
if not mapfile:
return []
completes = []
with open(mapfile) as f:
data = f.read()
# assume symbols are prefixed by a space character
search = f" {prefix}"
pos = data.find(search)
while pos != -1:
# skip the space character in the search string
pos += 1
# assume symbols are suffixed by either a space
# character or a (unix-style) line return
spacePos = data.find(" ", pos)
lineReturnPos = data.find("\n", pos)
if lineReturnPos == -1:
endPos = spacePos
elif spacePos == -1:
endPos = lineReturnPos
else:
endPos = min(spacePos, lineReturnPos)
if endPos == -1:
match = data[pos:]
pos = -1
else:
match = data[pos:endPos]
pos = data.find(search, endPos)
completes.append(match)
return completes
setattr(start_argument, "completer", complete_symbol)
parser.add_argument(
"end",
nargs="?",
help="Address to end diff at.",
)
parser.add_argument(
"-o",
dest="diff_obj",
action="store_true",
help="""Diff .o files rather than a whole binary. This makes it possible to
see symbol names. (Recommended)""",
)
parser.add_argument(
"-e",
"--elf",
dest="diff_elf_symbol",
metavar="SYMBOL",
help="""Diff a given function in two ELFs, one being stripped and the other
one non-stripped. Requires objdump from binutils 2.33+.""",
)
parser.add_argument(
"-c",
"--source",
dest="source",
action="store_true",
help="Show source code (if possible). Only works with -o or -e.",
)
parser.add_argument(
"-C",
"--source-old-binutils",
dest="source_old_binutils",
action="store_true",
help="""Tweak --source handling to make it work with binutils < 2.33.
Implies --source.""",
)
parser.add_argument(
"-L",
"--line-numbers",
dest="show_line_numbers",
action="store_const",
const=True,
help="""Show source line numbers in output, when available. May be enabled by
default depending on diff_settings.py.""",
)
parser.add_argument(
"--no-line-numbers",
dest="show_line_numbers",
action="store_const",
const=False,
help="Hide source line numbers in output.",
)
parser.add_argument(
"--inlines",
dest="inlines",
action="store_true",
help="Show inline function calls (if possible). Only works with -o or -e.",
)
parser.add_argument(
"--base-asm",
dest="base_asm",
metavar="FILE",
help="Read assembly from given file instead of configured base img.",
)
parser.add_argument(
"--write-asm",
dest="write_asm",
metavar="FILE",
help="Write the current assembly output to file, e.g. for use with --base-asm.",
)
parser.add_argument(
"-m",
"--make",
dest="make",
action="store_true",
help="Automatically run 'make' on the .o file or binary before diffing.",
)
parser.add_argument(
"-l",
"--skip-lines",
dest="skip_lines",
metavar="LINES",
type=int,
default=0,
help="Skip the first LINES lines of output.",
)
parser.add_argument(
"-s",
"--stop-jr-ra",
dest="stop_jrra",
action="store_true",
help="""Stop disassembling at the first 'jr ra'. Some functions have
multiple return points, so use with care!""",
)
parser.add_argument(
"-i",
"--ignore-large-imms",
dest="ignore_large_imms",
action="store_true",
help="Pretend all large enough immediates are the same.",
)
parser.add_argument(
"-I",
"--ignore-addr-diffs",
dest="ignore_addr_diffs",
action="store_true",
help="Ignore address differences. Currently only affects AArch64.",
)
parser.add_argument(
"-B",
"--no-show-branches",
dest="show_branches",
action="store_false",
help="Don't visualize branches/branch targets.",
)
parser.add_argument(
"-S",
"--base-shift",
dest="base_shift",
metavar="N",
type=str,
default="0",
help="""Diff position N in our img against position N + shift in the base img.
Arithmetic is allowed, so e.g. |-S "0x1234 - 0x4321"| is a reasonable
flag to pass if it is known that position 0x1234 in the base img syncs
up with position 0x4321 in our img. Not supported together with -o.""",
)
parser.add_argument(
"-w",
"--watch",
dest="watch",
action="store_true",
help="""Automatically update when source/object files change.
Recommended in combination with -m.""",
)
parser.add_argument(
"-3",
"--threeway=prev",
dest="threeway",
action="store_const",
const="prev",
help="""Show a three-way diff between target asm, current asm, and asm
prior to -w rebuild. Requires -w.""",
)
parser.add_argument(
"-b",
"--threeway=base",
dest="threeway",
action="store_const",
const="base",
help="""Show a three-way diff between target asm, current asm, and asm
when diff.py was started. Requires -w.""",
)
parser.add_argument(
"--width",
dest="column_width",
metavar="COLS",
type=int,
default=50,
help="Sets the width of the left and right view column.",
)
parser.add_argument(
"--algorithm",
dest="algorithm",
default="levenshtein",
choices=["levenshtein", "difflib"],
help="""Diff algorithm to use. Levenshtein gives the minimum diff, while difflib
aims for long sections of equal opcodes. Defaults to %(default)s.""",
)
parser.add_argument(
"--max-size",
"--max-lines",
metavar="LINES",
dest="max_lines",
type=int,
default=1024,
help="The maximum length of the diff, in lines.",
)
parser.add_argument(
"--no-pager",
dest="no_pager",
action="store_true",
help="""Disable the pager; write output directly to stdout, then exit.
Incompatible with --watch.""",
)
parser.add_argument(
"--format",
choices=("color", "plain", "html", "json"),
default="color",
help="Output format, default is color. --format=html or json implies --no-pager.",
)
parser.add_argument(
"-U",
"--compress-matching",
metavar="N",
dest="compress_matching",
type=int,
help="""Compress streaks of matching lines, leaving N lines of context
around non-matching parts.""",
)
parser.add_argument(
"-V",
"--compress-sameinstr",
metavar="N",
dest="compress_sameinstr",
type=int,
help="""Compress streaks of lines with same instructions (but possibly
different regalloc), leaving N lines of context around other parts.""",
)
# Project-specific flags, e.g. different versions/make arguments.
add_custom_arguments_fn = getattr(diff_settings, "add_custom_arguments", None)
if add_custom_arguments_fn:
add_custom_arguments_fn(parser)
if argcomplete:
argcomplete.autocomplete(parser)
# ==== IMPORTS ====
# (We do imports late to optimize auto-complete performance.)
import abc
import ast
from collections import Counter, defaultdict
from dataclasses import asdict, dataclass, field, replace
import difflib
import enum
import html
import itertools
import json
import os
import queue
import re
import string
import struct
import subprocess
import threading
import time
import traceback
MISSING_PREREQUISITES = (
"Missing prerequisite python module {}. "
"Run `python3 -m pip install --user colorama watchdog python-Levenshtein cxxfilt` to install prerequisites (cxxfilt only needed with --source)."
)
try:
from colorama import Back, Fore, Style
import watchdog
except ModuleNotFoundError as e:
fail(MISSING_PREREQUISITES.format(e.name))
# ==== CONFIG ====
@dataclass
class ProjectSettings:
arch_str: str
objdump_executable: str
build_command: List[str]
map_format: str
mw_build_dir: str
baseimg: Optional[str]
myimg: Optional[str]
mapfile: Optional[str]
source_directories: Optional[List[str]]
source_extensions: List[str]
show_line_numbers_default: bool
@dataclass
class Compress:
context: int
same_instr: bool
@dataclass
class Config:
arch: "ArchSettings"
# Build/objdump options
diff_obj: bool
make: bool
source: bool
source_old_binutils: bool
inlines: bool
max_function_size_lines: int
max_function_size_bytes: int
# Display options
formatter: "Formatter"
threeway: Optional[str]
base_shift: int
skip_lines: int
compress: Optional[Compress]
show_branches: bool
show_line_numbers: bool
stop_jrra: bool
ignore_large_imms: bool
ignore_addr_diffs: bool
algorithm: str
# Score options
score_stack_differences = True
penalty_stackdiff = 1
penalty_regalloc = 5
penalty_reordering = 60
penalty_insertion = 100
penalty_deletion = 100
def create_project_settings(settings: Dict[str, Any]) -> ProjectSettings:
return ProjectSettings(
arch_str=settings.get("arch", "mips"),
baseimg=settings.get("baseimg"),
myimg=settings.get("myimg"),
mapfile=settings.get("mapfile"),
build_command=settings.get(
"make_command", ["make", *settings.get("makeflags", [])]
),
source_directories=settings.get("source_directories"),
source_extensions=settings.get(
"source_extensions", [".c", ".h", ".cpp", ".hpp", ".s"]
),
objdump_executable=get_objdump_executable(settings.get("objdump_executable")),
map_format=settings.get("map_format", "gnu"),
mw_build_dir=settings.get("mw_build_dir", "build/"),
show_line_numbers_default=settings.get("show_line_numbers_default", True),
)
def create_config(args: argparse.Namespace, project: ProjectSettings) -> Config:
formatter: Formatter
if args.format == "plain":
formatter = PlainFormatter(column_width=args.column_width)
elif args.format == "color":
formatter = AnsiFormatter(column_width=args.column_width)
elif args.format == "html":
formatter = HtmlFormatter()
elif args.format == "json":
formatter = JsonFormatter(arch_str=project.arch_str)
else:
raise ValueError(f"Unsupported --format: {args.format}")
compress = None
if args.compress_matching is not None:
compress = Compress(args.compress_matching, False)
if args.compress_sameinstr is not None:
if compress is not None:
raise ValueError(
"Cannot pass both --compress-matching and --compress-sameinstr"
)
compress = Compress(args.compress_sameinstr, True)
show_line_numbers = args.show_line_numbers
if show_line_numbers is None:
show_line_numbers = project.show_line_numbers_default
return Config(
arch=get_arch(project.arch_str),
# Build/objdump options
diff_obj=args.diff_obj,
make=args.make,
source=args.source or args.source_old_binutils,
source_old_binutils=args.source_old_binutils,
inlines=args.inlines,
max_function_size_lines=args.max_lines,
max_function_size_bytes=args.max_lines * 4,
# Display options
formatter=formatter,
threeway=args.threeway,
base_shift=eval_int(
args.base_shift, "Failed to parse --base-shift (-S) argument as an integer."
),
skip_lines=args.skip_lines,
compress=compress,
show_branches=args.show_branches,
show_line_numbers=show_line_numbers,
stop_jrra=args.stop_jrra,
ignore_large_imms=args.ignore_large_imms,
ignore_addr_diffs=args.ignore_addr_diffs,
algorithm=args.algorithm,
)
def get_objdump_executable(objdump_executable: Optional[str]) -> str:
if objdump_executable is not None:
return objdump_executable
for objdump_cand in ["mips-linux-gnu-objdump", "mips64-elf-objdump"]:
try:
subprocess.check_call(
[objdump_cand, "--version"],
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
)
return objdump_cand
except subprocess.CalledProcessError:
pass
except FileNotFoundError:
pass
return fail(
"Missing binutils; please ensure mips-linux-gnu-objdump or mips64-elf-objdump exist, or configure objdump_executable."
)
def get_arch(arch_str: str) -> "ArchSettings":
if arch_str == "mips":
return MIPS_SETTINGS
if arch_str == "aarch64":
return AARCH64_SETTINGS
if arch_str == "ppc":
return PPC_SETTINGS
return fail(f"Unknown architecture: {arch_str}")
BUFFER_CMD: List[str] = ["tail", "-c", str(10 ** 9)]
# -S truncates long lines instead of wrapping them
# -R interprets color escape sequences
# -i ignores case when searching
# -c something about how the screen gets redrawn; I don't remember the purpose
# -#6 makes left/right arrow keys scroll by 6 characters
LESS_CMD: List[str] = ["less", "-SRic", "-#6"]
DEBOUNCE_DELAY: float = 0.1
# ==== FORMATTING ====
@enum.unique
class BasicFormat(enum.Enum):
NONE = enum.auto()
IMMEDIATE = enum.auto()
STACK = enum.auto()
REGISTER = enum.auto()
DELAY_SLOT = enum.auto()
DIFF_CHANGE = enum.auto()
DIFF_ADD = enum.auto()
DIFF_REMOVE = enum.auto()
SOURCE_FILENAME = enum.auto()
SOURCE_FUNCTION = enum.auto()
SOURCE_LINE_NUM = enum.auto()
SOURCE_OTHER = enum.auto()
@dataclass(frozen=True)
class RotationFormat:
group: str
index: int
key: str
Format = Union[BasicFormat, RotationFormat]
FormatFunction = Callable[[str], Format]
class Text:
segments: List[Tuple[str, Format]]
def __init__(self, line: str = "", f: Format = BasicFormat.NONE) -> None:
self.segments = [(line, f)] if line else []
def reformat(self, f: Format) -> "Text":
return Text(self.plain(), f)
def plain(self) -> str:
return "".join(s for s, f in self.segments)
def __repr__(self) -> str:
return f"<Text: {self.plain()!r}>"
def __bool__(self) -> bool:
return any(s for s, f in self.segments)
def __str__(self) -> str:
# Use Formatter.apply(...) instead
return NotImplemented
def __eq__(self, other: object) -> bool:
return NotImplemented
def __add__(self, other: Union["Text", str]) -> "Text":
if isinstance(other, str):
other = Text(other)
result = Text()
# If two adjacent segments have the same format, merge their lines
if (
self.segments
and other.segments
and self.segments[-1][1] == other.segments[0][1]
):
result.segments = (
self.segments[:-1]
+ [(self.segments[-1][0] + other.segments[0][0], self.segments[-1][1])]
+ other.segments[1:]
)
else:
result.segments = self.segments + other.segments
return result
def __radd__(self, other: Union["Text", str]) -> "Text":
if isinstance(other, str):
other = Text(other)
return other + self
def finditer(self, pat: Pattern[str]) -> Iterator[Match[str]]:
"""Replacement for `pat.finditer(text)` that operates on the inner text,
and returns the exact same matches as `Text.sub(pat, ...)`."""
for chunk, f in self.segments:
for match in pat.finditer(chunk):
yield match
def sub(self, pat: Pattern[str], sub_fn: Callable[[Match[str]], "Text"]) -> "Text":
result = Text()
for chunk, f in self.segments:
i = 0
for match in pat.finditer(chunk):
start, end = match.start(), match.end()
assert i <= start <= end <= len(chunk)
sub = sub_fn(match)
if i != start:
result.segments.append((chunk[i:start], f))
result.segments.extend(sub.segments)
i = end
if chunk[i:]:
result.segments.append((chunk[i:], f))
return result
def ljust(self, column_width: int) -> "Text":
length = sum(len(x) for x, _ in self.segments)
return self + " " * max(column_width - length, 0)
@dataclass
class TableMetadata:
headers: Tuple[Text, ...]
current_score: int
previous_score: Optional[int]
class Formatter(abc.ABC):
@abc.abstractmethod
def apply_format(self, chunk: str, f: Format) -> str:
"""Apply the formatting `f` to `chunk` and escape the contents."""
...
@abc.abstractmethod
def table(self, meta: TableMetadata, lines: List[Tuple["OutputLine", ...]]) -> str:
"""Format a multi-column table with metadata"""
...
def apply(self, text: Text) -> str:
return "".join(self.apply_format(chunk, f) for chunk, f in text.segments)
@staticmethod
def outputline_texts(lines: Tuple["OutputLine", ...]) -> Tuple[Text, ...]:
return tuple([lines[0].base or Text()] + [line.fmt2 for line in lines[1:]])
@dataclass
class PlainFormatter(Formatter):
column_width: int
def apply_format(self, chunk: str, f: Format) -> str:
return chunk
def table(self, meta: TableMetadata, lines: List[Tuple["OutputLine", ...]]) -> str:
rows = [meta.headers] + [self.outputline_texts(ls) for ls in lines]
return "\n".join(
"".join(self.apply(x.ljust(self.column_width)) for x in row) for row in rows
)
@dataclass
class AnsiFormatter(Formatter):
# Additional ansi escape codes not in colorama. See:
# https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters
STYLE_UNDERLINE = "\x1b[4m"
STYLE_NO_UNDERLINE = "\x1b[24m"
STYLE_INVERT = "\x1b[7m"
BASIC_ANSI_CODES = {
BasicFormat.NONE: "",
BasicFormat.IMMEDIATE: Fore.LIGHTBLUE_EX,
BasicFormat.STACK: Fore.YELLOW,
BasicFormat.REGISTER: Fore.YELLOW,
BasicFormat.DELAY_SLOT: Fore.LIGHTBLACK_EX,
BasicFormat.DIFF_CHANGE: Fore.LIGHTBLUE_EX,
BasicFormat.DIFF_ADD: Fore.GREEN,
BasicFormat.DIFF_REMOVE: Fore.RED,
BasicFormat.SOURCE_FILENAME: Style.DIM + Style.BRIGHT,
BasicFormat.SOURCE_FUNCTION: Style.DIM + Style.BRIGHT + STYLE_UNDERLINE,
BasicFormat.SOURCE_LINE_NUM: Fore.LIGHTBLACK_EX,
BasicFormat.SOURCE_OTHER: Style.DIM,
}
BASIC_ANSI_CODES_UNDO = {
BasicFormat.NONE: "",
BasicFormat.SOURCE_FILENAME: Style.NORMAL,
BasicFormat.SOURCE_FUNCTION: Style.NORMAL + STYLE_NO_UNDERLINE,
BasicFormat.SOURCE_OTHER: Style.NORMAL,
}
ROTATION_ANSI_COLORS = [
Fore.MAGENTA,
Fore.CYAN,
Fore.GREEN,
Fore.RED,
Fore.LIGHTYELLOW_EX,
Fore.LIGHTMAGENTA_EX,
Fore.LIGHTCYAN_EX,
Fore.LIGHTGREEN_EX,
Fore.LIGHTBLACK_EX,
]
column_width: int
def apply_format(self, chunk: str, f: Format) -> str:
if f == BasicFormat.NONE:
return chunk
undo_ansi_code = Fore.RESET
if isinstance(f, BasicFormat):
ansi_code = self.BASIC_ANSI_CODES[f]
undo_ansi_code = self.BASIC_ANSI_CODES_UNDO.get(f, undo_ansi_code)
elif isinstance(f, RotationFormat):
ansi_code = self.ROTATION_ANSI_COLORS[
f.index % len(self.ROTATION_ANSI_COLORS)
]
else:
static_assert_unreachable(f)
return f"{ansi_code}{chunk}{undo_ansi_code}"
def table(self, meta: TableMetadata, lines: List[Tuple["OutputLine", ...]]) -> str:
rows = [(meta.headers, False)] + [
(self.outputline_texts(line), line[1].is_data_ref) for line in lines
]
return "\n".join(
"".join(
(self.STYLE_INVERT if is_data_ref else "")
+ self.apply(x.ljust(self.column_width))
for x in row
)
for (row, is_data_ref) in rows
)
@dataclass
class HtmlFormatter(Formatter):
rotation_formats: int = 9
def apply_format(self, chunk: str, f: Format) -> str:
chunk = html.escape(chunk)
if f == BasicFormat.NONE:
return chunk
if isinstance(f, BasicFormat):
class_name = f.name.lower().replace("_", "-")
data_attr = ""
elif isinstance(f, RotationFormat):
class_name = f"rotation-{f.index % self.rotation_formats}"
rotation_key = html.escape(f"{f.group};{f.key}", quote=True)
data_attr = f'data-rotation="{rotation_key}"'
else:
static_assert_unreachable(f)
return f"<span class='{class_name}' {data_attr}>{chunk}</span>"
def table(self, meta: TableMetadata, lines: List[Tuple["OutputLine", ...]]) -> str:
def table_row(line: Tuple[Text, ...], is_data_ref: bool, cell_el: str) -> str:
tr_attrs = " class='data-ref'" if is_data_ref else ""
output_row = f" <tr{tr_attrs}>"
for cell in line:
cell_html = self.apply(cell)
output_row += f"<{cell_el}>{cell_html}</{cell_el}>"
output_row += "</tr>\n"
return output_row
output = "<table class='diff'>\n"
output += " <thead>\n"
output += table_row(meta.headers, False, "th")
output += " </thead>\n"
output += " <tbody>\n"
output += "".join(
table_row(self.outputline_texts(line), line[1].is_data_ref, "td")
for line in lines
)
output += " </tbody>\n"
output += "</table>\n"
return output
@dataclass
class JsonFormatter(Formatter):
arch_str: str
def apply_format(self, chunk: str, f: Format) -> str:
# This method is unused by this formatter
return NotImplemented
def table(self, meta: TableMetadata, rows: List[Tuple["OutputLine", ...]]) -> str:
def serialize_format(s: str, f: Format) -> Dict[str, Any]:
if f == BasicFormat.NONE:
return {"text": s}
elif isinstance(f, BasicFormat):
return {"text": s, "format": f.name.lower()}
elif isinstance(f, RotationFormat):
attrs = asdict(f)
attrs.update(
{
"text": s,
"format": "rotation",
}
)
return attrs
else:
static_assert_unreachable(f)
def serialize(text: Optional[Text]) -> List[Dict[str, Any]]:
if text is None:
return []
return [serialize_format(s, f) for s, f in text.segments]
is_threeway = len(meta.headers) == 3
output: Dict[str, Any] = {}
output["arch_str"] = self.arch_str
output["header"] = {
name: serialize(h)
for h, name in zip(meta.headers, ("base", "current", "previous"))
}
output["current_score"] = meta.current_score
if meta.previous_score is not None:
output["previous_score"] = meta.previous_score
output_rows: List[Dict[str, Any]] = []
for row in rows:
output_row: Dict[str, Any] = {}
output_row["key"] = row[0].key2
output_row["is_data_ref"] = row[1].is_data_ref
iters = [
("base", row[0].base, row[0].line1),
("current", row[1].fmt2, row[1].line2),
]
if is_threeway:
iters.append(("previous", row[2].fmt2, row[2].line2))
if all(line is None for _, _, line in iters):
# Skip rows that were only for displaying source code
continue
for column_name, text, line in iters:
column: Dict[str, Any] = {}
column["text"] = serialize(text)
if line:
if line.line_num is not None:
column["line"] = line.line_num
if line.branch_target is not None:
column["branch"] = line.branch_target
if line.source_lines:
column["src"] = line.source_lines
if line.comment is not None:
column["src_comment"] = line.comment
if line.source_line_num is not None:
column["src_line"] = line.source_line_num
if line or column["text"]:
output_row[column_name] = column
output_rows.append(output_row)
output["rows"] = output_rows
return json.dumps(output)
def format_fields(
pat: Pattern[str],
out1: Text,
out2: Text,
color1: FormatFunction,
color2: Optional[FormatFunction] = None,
) -> Tuple[Text, Text]:
diffs = [
of.group() != nf.group()
for (of, nf) in zip(out1.finditer(pat), out2.finditer(pat))
]
it = iter(diffs)
def maybe_color(color: FormatFunction, s: str) -> Text:
return Text(s, color(s)) if next(it, False) else Text(s)
out1 = out1.sub(pat, lambda m: maybe_color(color1, m.group()))
it = iter(diffs)
out2 = out2.sub(pat, lambda m: maybe_color(color2 or color1, m.group()))
return out1, out2
def symbol_formatter(group: str, base_index: int) -> FormatFunction:
symbol_formats: Dict[str, Format] = {}
def symbol_format(s: str) -> Format:
# TODO: it would be nice to use a unique Format for each symbol, so we could
# add extra UI elements in the HTML version
f = symbol_formats.get(s)
if f is None:
index = len(symbol_formats) + base_index
f = RotationFormat(key=s, index=index, group=group)
symbol_formats[s] = f
return f
return symbol_format
# ==== LOGIC ====
ObjdumpCommand = Tuple[List[str], str, Optional[str]]
def maybe_eval_int(expr: str) -> Optional[int]:
try:
ret = ast.literal_eval(expr)
if not isinstance(ret, int):
raise Exception("not an integer")
return ret
except Exception:
return None
def eval_int(expr: str, emsg: str) -> int:
ret = maybe_eval_int(expr)
if ret is None:
fail(emsg)
return ret
def eval_line_num(expr: str) -> Optional[int]:
expr = expr.strip().replace(":", "")
if expr == "":
return None
return int(expr, 16)
def run_make(target: str, project: ProjectSettings) -> None:
subprocess.check_call(project.build_command + [target])
def run_make_capture_output(
target: str, project: ProjectSettings
) -> "subprocess.CompletedProcess[bytes]":
return subprocess.run(
project.build_command + [target],
stderr=subprocess.PIPE,
stdout=subprocess.PIPE,
)
def restrict_to_function(dump: str, fn_name: str) -> str:
try:
ind = dump.index("\n", dump.index(f"<{fn_name}>:"))
return dump[ind + 1 :]
except ValueError:
return ""
def serialize_data_references(references: List[Tuple[int, int, str]]) -> str:
return "".join(
f"DATAREF {text_offset} {from_offset} {from_section}\n"
for (text_offset, from_offset, from_section) in references
)
def maybe_get_objdump_source_flags(config: Config) -> List[str]:
flags = []
if config.show_line_numbers or config.source:
flags.append("--line-numbers")
if config.source:
flags.append("--source")
if not config.source_old_binutils:
flags.append("--source-comment=│ ")
if config.inlines:
flags.append("--inlines")
return flags
def run_objdump(cmd: ObjdumpCommand, config: Config, project: ProjectSettings) -> str:
flags, target, restrict = cmd
try:
out = subprocess.run(
[project.objdump_executable] + config.arch.arch_flags + flags + [target],
check=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True,
).stdout
except subprocess.CalledProcessError as e:
print(e.stdout)
print(e.stderr)
if "unrecognized option '--source-comment" in e.stderr:
fail("** Try using --source-old-binutils instead of --source **")
raise e
if restrict is not None:
out = restrict_to_function(out, restrict)