jwnhy added a comment.
Hi, guys, I have met this issue #61706
<https://github.com/llvm/llvm-project/issues/61706>.
The case I provided shows that even without DWARF v2, this problem still exists.
I wonder if such modification is really needed or not.
Also, I am not sure changing all these to `int` actually fixes the issue here.
In fact, in `UpdateValue`, the `m_byte_offset` also changed by the
`overhang_bytes` in line .
For a bitfield not aligned to `*type_bit_size`, moving `overhang_bytes` will
cause truncation in the bitfield.
#pragma pack(1)
struct {
signed f0 : 27;
unsigned f5 : 30;
} g_96 = {5070, 1795821};
int main() {return 0;}
The structure in memory is represented as `0xdb37680013ce`, adding
`m_byte_offset` with `overhang_bytes` results in `0xdb37`, with last five bits
lost.
This patchset may fix the underflow problem of `m_bitfield_bit_offset`, but
does not fix the truncation issue...
Not knowing there is a WIP patch, I have created another smaller patch, which
just checks... (if it's not ok to hijack the thread, plz tell me...I am really
newbie...)
https://reviews.llvm.org/D146919
I wonder if it's ok I take over this issue?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D138197/new/
https://reviews.llvm.org/D138197
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