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reccmp: Sanitize performance (and more) (#654)

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MS 2024-03-10 14:49:45 -04:00 committed by GitHub
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7 changed files with 172 additions and 124 deletions
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27
tools/isledecomp/isledecomp/compare/asm/const.py Normal file
View file

@ -0,0 +1,27 @@
# Duplicates removed, according to the mnemonics capstone uses.
# e.g. je and jz are the same instruction. capstone uses je.
# See: /arch/X86/X86GenAsmWriter.inc in the capstone repo.
JUMP_MNEMONICS = {
"ja",
"jae",
"jb",
"jbe",
"jcxz", # unused?
"je",
"jecxz",
"jg",
"jge",
"jl",
"jle",
"jmp",
"jne",
"jno",
"jnp",
"jns",
"jo",
"jp",
"js",
}
# Guaranteed to be a single operand.
SINGLE_OPERAND_INSTS = {"push", "call", *JUMP_MNEMONICS}

149
tools/isledecomp/isledecomp/compare/asm/parse.py
View file

@ -12,10 +12,15 @@
from collections import namedtuple
from isledecomp.bin import InvalidVirtualAddressError
from capstone import Cs, CS_ARCH_X86, CS_MODE_32
from .const import JUMP_MNEMONICS, SINGLE_OPERAND_INSTS
disassembler = Cs(CS_ARCH_X86, CS_MODE_32)
ptr_replace_regex = re.compile(r"(?P<data_size>\w+) ptr \[(?P<addr>0x[0-9a-fA-F]+)\]")
ptr_replace_regex = re.compile(r"\[(0x[0-9a-f]+)\]")
# For matching an immediate value on its own.
# Preceded by start-of-string (first operand) or comma-space (second operand)
immediate_replace_regex = re.compile(r"(?:^|, )(0x[0-9a-f]+)")
DisasmLiteInst = namedtuple("DisasmLiteInst", "address, size, mnemonic, op_str")
@ -30,10 +35,6 @@ def from_hex(string: str) -> Optional[int]:
return None
def get_float_size(size_str: str) -> int:
return 8 if size_str == "qword" else 4
class ParseAsm:
def __init__(
self,
@ -94,14 +95,41 @@ def replace(self, addr: int) -> str:
self.replacements[addr] = placeholder
return placeholder
def hex_replace_always(self, match: re.Match) -> str:
"""If a pointer value was matched, always insert a placeholder"""
value = int(match.group(1), 16)
return match.group(0).replace(match.group(1), self.replace(value))
def hex_replace_relocated(self, match: re.Match) -> str:
"""For replacing immediate value operands. We only want to
use the placeholder if we are certain that this is a valid address.
We can check the relocation table to find out."""
value = int(match.group(1), 16)
if self.is_relocated(value):
return match.group(0).replace(match.group(1), self.replace(value))
return match.group(0)
def hex_replace_float(self, match: re.Match) -> str:
"""Special case for replacements on float instructions.
If the pointer is a float constant, read it from the binary."""
value = int(match.group(1), 16)
# If we can find a variable name for this pointer, use it.
placeholder = self.lookup(value)
# Read what's under the pointer and show the decimal value.
if placeholder is None:
float_size = 8 if "qword" in match.string else 4
placeholder = self.float_replace(value, float_size)
# If we can't read the float, use a regular placeholder.
if placeholder is None:
placeholder = self.replace(value)
return match.group(0).replace(match.group(1), placeholder)
def sanitize(self, inst: DisasmLiteInst) -> Tuple[str, str]:
if len(inst.op_str) == 0:
# Nothing to sanitize
return (inst.mnemonic, "")
if "0x" not in inst.op_str:
return (inst.mnemonic, inst.op_str)
# For jumps or calls, if the entire op_str is a hex number, the value
# is a relative offset.
# Otherwise (i.e. it looks like `dword ptr [address]`) it is an
@ -109,12 +137,21 @@ def sanitize(self, inst: DisasmLiteInst) -> Tuple[str, str]:
# Providing the starting address of the function to capstone.disasm has
# automatically resolved relative offsets to an absolute address.
# We will have to undo this for some of the jumps or they will not match.
op_str_address = from_hex(inst.op_str)
if op_str_address is not None:
if (
inst.mnemonic in SINGLE_OPERAND_INSTS
and (op_str_address := from_hex(inst.op_str)) is not None
):
if inst.mnemonic == "call":
return (inst.mnemonic, self.replace(op_str_address))
if inst.mnemonic == "push":
if self.is_relocated(op_str_address):
return (inst.mnemonic, self.replace(op_str_address))
# To avoid falling into jump handling
return (inst.mnemonic, inst.op_str)
if inst.mnemonic == "jmp":
# The unwind section contains JMPs to other functions.
# If we have a name for this address, use it. If not,
@ -124,70 +161,19 @@ def sanitize(self, inst: DisasmLiteInst) -> Tuple[str, str]:
if potential_name is not None:
return (inst.mnemonic, potential_name)
if inst.mnemonic.startswith("j"):
# i.e. if this is any jump
# Show the jump offset rather than the absolute address
jump_displacement = op_str_address - (inst.address + inst.size)
return (inst.mnemonic, hex(jump_displacement))
def filter_out_ptr(match):
"""Helper for re.sub, see below"""
offset = from_hex(match.group("addr"))
if offset is not None:
# We assume this is always an address to replace
placeholder = self.replace(offset)
return f'{match.group("data_size")} ptr [{placeholder}]'
# Strict regex should ensure we can read the hex number.
# But just in case: return the string with no changes
return match.group(0)
def float_ptr_replace(match):
offset = from_hex(match.group("addr"))
if offset is not None:
# If we can find a variable name for this pointer, use it.
placeholder = self.lookup(offset)
# Read what's under the pointer and show the decimal value.
if placeholder is None:
placeholder = self.float_replace(
offset, get_float_size(match.group("data_size"))
)
# If we can't read the float, use a regular placeholder.
if placeholder is None:
placeholder = self.replace(offset)
return f'{match.group("data_size")} ptr [{placeholder}]'
# Strict regex should ensure we can read the hex number.
# But just in case: return the string with no changes
return match.group(0)
# Else: this is any jump
# Show the jump offset rather than the absolute address
jump_displacement = op_str_address - (inst.address + inst.size)
return (inst.mnemonic, hex(jump_displacement))
if inst.mnemonic.startswith("f"):
# If floating point instruction
op_str = ptr_replace_regex.sub(float_ptr_replace, inst.op_str)
op_str = ptr_replace_regex.sub(self.hex_replace_float, inst.op_str)
else:
op_str = ptr_replace_regex.sub(filter_out_ptr, inst.op_str)
op_str = ptr_replace_regex.sub(self.hex_replace_always, inst.op_str)
def replace_immediate(chunk: str) -> str:
if (inttest := from_hex(chunk)) is not None:
# If this value is a virtual address, it is referenced absolutely,
# which means it must be in the relocation table.
if self.is_relocated(inttest):
return self.replace(inttest)
return chunk
# Performance hack:
# Skip this step if there is nothing left to consider replacing.
if "0x" in op_str:
# Replace immediate values with name or placeholder (where appropriate)
op_str = ", ".join(map(replace_immediate, op_str.split(", ")))
return inst.mnemonic, op_str
op_str = immediate_replace_regex.sub(self.hex_replace_relocated, op_str)
return (inst.mnemonic, op_str)
def parse_asm(self, data: bytes, start_addr: Optional[int] = 0) -> List[str]:
asm = []
@ -196,7 +182,22 @@ def parse_asm(self, data: bytes, start_addr: Optional[int] = 0) -> List[str]:
# Use heuristics to disregard some differences that aren't representative
# of the accuracy of a function (e.g. global offsets)
inst = DisasmLiteInst(*raw_inst)
result = self.sanitize(inst)
# If there is no pointer or immediate value in the op_str,
# there is nothing to sanitize.
# This leaves us with cases where a small immediate value or
# small displacement (this.member or vtable calls) appears.
# If we assume that instructions we want to sanitize need to be 5
# bytes -- 1 for the opcode and 4 for the address -- exclude cases
# where the hex value could not be an address.
# The exception is jumps which are as small as 2 bytes
# but are still useful to sanitize.
if "0x" in inst.op_str and (
inst.mnemonic in JUMP_MNEMONICS or inst.size > 4
):
result = self.sanitize(inst)
else:
result = (inst.mnemonic, inst.op_str)
# mnemonic + " " + op_str
asm.append((hex(inst.address), " ".join(result)))

6
tools/isledecomp/isledecomp/compare/core.py
View file

@ -158,9 +158,9 @@ def _load_cvdump(self):
addr, sym.node_type, sym.name(), sym.decorated_name, sym.size()
)
for lineref in cv.lines:
addr = self.recomp_bin.get_abs_addr(lineref.section, lineref.offset)
self._lines_db.add_line(lineref.filename, lineref.line_no, addr)
for (section, offset), (filename, line_no) in res.verified_lines.items():
addr = self.recomp_bin.get_abs_addr(section, offset)
self._lines_db.add_line(filename, line_no, addr)
# The _entry symbol is referenced in the PE header so we get this match for free.
self._db.set_function_pair(self.orig_bin.entry, self.recomp_bin.entry)

15
tools/isledecomp/isledecomp/cvdump/analysis.py
View file

@ -1,5 +1,5 @@
"""For collating the results from parsing cvdump.exe into a more directly useful format."""
from typing import List, Optional
from typing import Dict, List, Tuple, Optional
from isledecomp.types import SymbolType
from .parser import CvdumpParser
from .demangler import demangle_string_const, demangle_vtable
@ -81,6 +81,7 @@ class CvdumpAnalysis:
These can then be analyzed by a downstream tool."""
nodes = List[CvdumpNode]
verified_lines = Dict[Tuple[str, str], Tuple[str, str]]
def __init__(self, parser: CvdumpParser):
"""Read in as much information as we have from the parser.
@ -126,13 +127,21 @@ def __init__(self, parser: CvdumpParser):
# No big deal if we don't have complete type information.
pass
for lin in parser.lines:
key = (lin.section, lin.offset)
for key, _ in parser.lines.items():
# Here we only set if the section:offset already exists
# because our values include offsets inside of the function.
if key in node_dict:
node_dict[key].node_type = SymbolType.FUNCTION
# The LINES section contains every code line in the file, naturally.
# There isn't an obvious separation between functions, so we have to
# read everything. However, any function that would be in LINES
# has to be somewhere else in the PDB (probably PUBLICS).
# Isolate the lines that we actually care about for matching.
self.verified_lines = {
key: value for (key, value) in parser.lines.items() if key in node_dict
}
for sym in parser.symbols:
key = (sym.section, sym.offset)
if key not in node_dict:

32
tools/isledecomp/isledecomp/cvdump/parser.py
View file

@ -4,7 +4,7 @@
from .types import CvdumpTypesParser
# e.g. `*** PUBLICS`
_section_change_regex = re.compile(r"^\*\*\* (?P<section>[A-Z/ ]+)$")
_section_change_regex = re.compile(r"\*\*\* (?P<section>[A-Z/ ]{2,})")
# e.g. ` 27 00034EC0 28 00034EE2 29 00034EE7 30 00034EF4`
_line_addr_pairs_findall = re.compile(r"\s+(?P<line_no>\d+) (?P<addr>[A-F0-9]{8})")
@ -70,7 +70,7 @@ def __init__(self) -> None:
self._section: str = ""
self._lines_function: Tuple[str, int] = ("", 0)
self.lines = []
self.lines = {}
self.publics = []
self.symbols = []
self.sizerefs = []
@ -95,14 +95,8 @@ def _lines_section(self, line: str):
# Match any pairs as we find them
for line_no, offset in _line_addr_pairs_findall.findall(line):
self.lines.append(
LinesEntry(
filename=self._lines_function[0],
line_no=int(line_no),
section=self._lines_function[1],
offset=int(offset, 16),
)
)
key = (self._lines_function[1], int(offset, 16))
self.lines[key] = (self._lines_function[0], int(line_no))
def _publics_section(self, line: str):
"""Match each line from PUBLICS and pull out the symbol information.
@ -175,23 +169,22 @@ def _modules_section(self, line: str):
)
def read_line(self, line: str):
# Blank lines are there to help the reader; they have no context significance
if line.strip() == "":
return
if (match := _section_change_regex.match(line)) is not None:
self._section = match.group(1)
return
if self._section == "LINES":
if self._section == "TYPES":
self.types.read_line(line)
elif self._section == "SYMBOLS":
self._symbols_section(line)
elif self._section == "LINES":
self._lines_section(line)
elif self._section == "PUBLICS":
self._publics_section(line)
elif self._section == "SYMBOLS":
self._symbols_section(line)
elif self._section == "SECTION CONTRIBUTIONS":
self._section_contributions(line)
@ -201,9 +194,6 @@ def read_line(self, line: str):
elif self._section == "MODULES":
self._modules_section(line)
elif self._section == "TYPES":
self.types.read_line(line)
def read_lines(self, lines: Iterable[str]):
for line in lines:
self.read_line(line)

13
tools/isledecomp/isledecomp/cvdump/runner.py
View file

@ -1,3 +1,4 @@
import io
from os import name as os_name
from enum import Enum
from typing import List
@ -71,8 +72,12 @@ def cmd_line(self) -> List[str]:
return ["wine", cvdump_exe, *flags, winepath_unix_to_win(self._pdb)]
def run(self) -> CvdumpParser:
p = CvdumpParser()
parser = CvdumpParser()
call = self.cmd_line()
lines = subprocess.check_output(call).decode("utf-8").split("\r\n")
p.read_lines(lines)
return p
with subprocess.Popen(call, stdout=subprocess.PIPE) as proc:
for line in io.TextIOWrapper(proc.stdout, encoding="utf-8"):
# Blank lines are there to help the reader; they have no context significance
if line != "\n":
parser.read_line(line)
return parser

54
tools/isledecomp/isledecomp/cvdump/types.py
View file

@ -56,11 +56,11 @@ def normalize_type_id(key: str) -> str:
If key begins with "T_" it is a built-in type.
Else it is a hex string. We prefer lower case letters and
no leading zeroes. (UDT identifier pads to 8 characters.)"""
if key.startswith("T_"):
# Remove numeric value for "T_" type. We don't use this.
return key[: key.index("(")] if "(" in key else key
if key[0] == "0":
return f"0x{key[-4:].lower()}"
return hex(int(key, 16)).lower()
# Remove numeric value for "T_" type. We don't use this.
return key.partition("(")[0]
def scalar_type_pointer(type_name: str) -> bool:
@ -203,8 +203,18 @@ class CvdumpTypesParser:
# LF_MODIFIER, type being modified
MODIFIES_RE = re.compile(r".*modifies type (?P<type>.*)$")
MODES_OF_INTEREST = {
"LF_ARRAY",
"LF_CLASS",
"LF_ENUM",
"LF_FIELDLIST",
"LF_MODIFIER",
"LF_POINTER",
"LF_STRUCTURE",
}
def __init__(self) -> None:
self.mode = ""
self.mode: Optional[str] = None
self.last_key = ""
self.keys = {}
@ -370,13 +380,19 @@ def get_format_string(self, type_key: str) -> str:
def read_line(self, line: str):
if (match := self.INDEX_RE.match(line)) is not None:
self.last_key = normalize_type_id(match.group("key"))
self.mode = match.group("type")
self._new_type()
type_ = match.group(2)
if type_ not in self.MODES_OF_INTEREST:
self.mode = None
return
# We don't need to read anything else from here (for now)
if self.mode in ("LF_ENUM", "LF_POINTER"):
self._set("size", 4)
# Don't need to normalize, it's already in the format we want
self.last_key = match.group(1)
self.mode = type_
self._new_type()
return
if self.mode is None:
return
if self.mode == "LF_MODIFIER":
if (match := self.MODIFIES_RE.match(line)) is not None:
@ -385,14 +401,14 @@ def read_line(self, line: str):
self._set("is_forward_ref", True)
self._set("modifies", normalize_type_id(match.group("type")))
if self.mode == "LF_ARRAY":
elif self.mode == "LF_ARRAY":
if (match := self.ARRAY_ELEMENT_RE.match(line)) is not None:
self._set("array_type", normalize_type_id(match.group("type")))
if (match := self.ARRAY_LENGTH_RE.match(line)) is not None:
elif (match := self.ARRAY_LENGTH_RE.match(line)) is not None:
self._set("size", int(match.group("length")))
if self.mode == "LF_FIELDLIST":
elif self.mode == "LF_FIELDLIST":
# If this class has a vtable, create a mock member at offset 0
if (match := self.VTABLE_RE.match(line)) is not None:
# For our purposes, any pointer type will do
@ -400,20 +416,20 @@ def read_line(self, line: str):
self._set_member_name("vftable")
# Superclass is set here in the fieldlist rather than in LF_CLASS
if (match := self.SUPERCLASS_RE.match(line)) is not None:
elif (match := self.SUPERCLASS_RE.match(line)) is not None:
self._set("super", normalize_type_id(match.group("type")))
# Member offset and type given on the first of two lines.
if (match := self.LIST_RE.match(line)) is not None:
elif (match := self.LIST_RE.match(line)) is not None:
self._add_member(
int(match.group("offset")), normalize_type_id(match.group("type"))
)
# Name of the member read on the second of two lines.
if (match := self.MEMBER_RE.match(line)) is not None:
elif (match := self.MEMBER_RE.match(line)) is not None:
self._set_member_name(match.group("name"))
if self.mode in ("LF_STRUCTURE", "LF_CLASS"):
else: # LF_CLASS or LF_STRUCTURE
# Match the reference to the associated LF_FIELDLIST
if (match := self.CLASS_FIELD_RE.match(line)) is not None:
if match.group("field_type") == "0x0000":
@ -427,7 +443,7 @@ def read_line(self, line: str):
# Last line has the vital information.
# If this is a FORWARD REF, we need to follow the UDT pointer
# to get the actual class details.
if (match := self.CLASS_NAME_RE.match(line)) is not None:
elif (match := self.CLASS_NAME_RE.match(line)) is not None:
self._set("name", match.group("name"))
self._set("udt", normalize_type_id(match.group("udt")))
self._set("size", int(match.group("size")))