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ubsan: resolve the last of the TODOs

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David Rubin 2024-12-26 03:59:27 -08:00 committed by David Rubin
parent 50b95562fd
commit a468929519
1 changed files with 42 additions and 14 deletions
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56
lib/ubsan.zig
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@ -213,25 +213,34 @@ fn alignmentAssumptionHandler(
alignment: ValueHandle,
maybe_offset: ?ValueHandle,
) callconv(.c) noreturn {
_ = pointer;
// TODO: add the hint here?
// const real_pointer = @intFromPtr(pointer) - @intFromPtr(maybe_offset);
// const lsb = @ctz(real_pointer);
// const actual_alignment = @as(u64, 1) << @intCast(lsb);
// const mask = @intFromPtr(alignment) - 1;
// const misalignment_offset = real_pointer & mask;
// _ = actual_alignment;
// _ = misalignment_offset;
const real_pointer = @intFromPtr(pointer) - @intFromPtr(maybe_offset);
const lsb = @ctz(real_pointer);
const actual_alignment = @as(u64, 1) << @intCast(lsb);
const mask = @intFromPtr(alignment) - 1;
const misalignment_offset = real_pointer & mask;
if (maybe_offset) |offset| {
logMessage(
"assumption of {} byte alignment (with offset of {} byte) for pointer of type {s} failed",
.{ alignment.getValue(data), @intFromPtr(offset), data.type_descriptor.getName() },
"assumption of {} byte alignment (with offset of {} byte) for pointer of type {s} failed\n" ++
"offset address is {} aligned, misalignment offset is {} bytes",
.{
alignment.getValue(data),
@intFromPtr(offset),
data.type_descriptor.getName(),
actual_alignment,
misalignment_offset,
},
);
} else {
logMessage(
"assumption of {} byte alignment for pointer of type {s} failed",
.{ alignment.getValue(data), data.type_descriptor.getName() },
"assumption of {} byte alignment for pointer of type {s} failed\n" ++
"address is {} aligned, misalignment offset is {} bytes",
.{
alignment.getValue(data),
data.type_descriptor.getName(),
actual_alignment,
misalignment_offset,
},
);
}
}
@ -309,7 +318,26 @@ fn pointerOverflow(
.{base},
);
} else {
@panic("TODO");
const signed_base: isize = @bitCast(base);
const signed_result: isize = @bitCast(result);
if ((signed_base >= 0) == (signed_result >= 0)) {
if (base > result) {
logMessage(
"addition of unsigned offset to 0x{x} overflowed to 0x{x}",
.{ base, result },
);
} else {
logMessage(
"subtraction of unsigned offset to 0x{x} overflowed to 0x{x}",
.{ base, result },
);
}
} else {
logMessage(
"pointer index expression with base 0x{x} overflowed to 0x{x}",
.{ base, result },
);
}
}
}
}