[lldb-dev] [Bug 47820] New: Correct vFile:pread/pwrite packet format incompatibility with gdb

via lldb-dev lldb-dev at lists.llvm.org
Tue Oct 13 06:55:40 PDT 2020


            Bug ID: 47820
           Summary: Correct vFile:pread/pwrite packet format
                    incompatibility with gdb
           Product: lldb
           Version: 11.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: david.spickett at linaro.org
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

This is derived from discussion on: https://reviews.llvm.org/D89227

Where I updated the docs to say that vFile:pread/pwrite use different number
formats in gdb and lldb.

The protocol specification requires hex formatted numbers (no mention of 0x
prefix or not)
gdb/gdb-server send/expect to get hex numbers without an 0x prefix
lldb/lldb-server send decimal numbers and expect to get either decimal numbers
or hex with the 0x prefix

Plan to fix this: (from labath's comment)
* Change lldb to send hex with 0x prefix, wait a while
* Change lldb-server to always expect hex (0x prefix or otherwise), wait again
* Change lldb to send hex *without* the 0x prefix

Which gets us to matching gdb.

Waiting some time allows us to keep some compatibility going between old
clients and new servers. I'm interpreting this to mean wait a release between
each one.

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