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add length-addr to the metadata for patch-records #260

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Merged
sipma merged 1 commit into from
Mar 4, 2026
Merged

add length-addr to the metadata for patch-records #260

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20 changes: 20 additions & 0 deletions chb/buffer/LibraryCallCallsites.py
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Original file line number Diff line number Diff line change
Expand Up @@ -212,6 +212,25 @@ def lenarg(self) -> Optional["XXpr"]:
return self.instr.call_arguments[lenindex - 1]
return None

@property
def lenaddr(self) -> Optional[str]:
if self.lenarg is None:
return None
regname = str(self.lenarg)
locs = self.instr.reaching_definitions(regname)
valid = [loc for loc in locs if loc != "init"]
if len(valid) == 1:
return valid[0]
elif len(valid) == 0:
chklogger.logger.warning(
"No valid reaching def for %s at %s", regname, self.instr.iaddr)
return None
else:
# Multiple reaching defs means a join point — ambiguous, can't patch
chklogger.logger.warning(
"Multiple reaching defs for %s at %s: %s", regname, self.instr.iaddr, valid)
return None

@property
def lentype(self) -> str:
lenarg = self.lenarg
Expand Down Expand Up @@ -254,6 +273,7 @@ def to_json_result(self,
content["stack-offset"] = dstoffset
if self.lenarg is not None:
content["length-argument"] = str(self.lenarg)
content["length-addr"] = self.lenaddr
else:
content["length-argument"] = None
content["spare"] = spare
Expand Down