splhack added inline comments.
================
Comment at: lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp:592
if (data_sp->GetByteSize() < length)
- data_sp = MapFileData(file, -1, file_offset);
+ data_sp = MapFileData(file, length, file_offset);
if (data_sp)
----------------
bulbazord wrote:
> A length of `-1` means "map the whole file", if my understanding is correct.
> Why do we want to change this to `length` instead of just -1? Or is this
> `file` the entire zip file?
I'm now updating this diff to add comments to clarify the intention.
For Android zip .so file (D152759),
the ModuleSpec `spec` will have these info with this diff.
- object offset = .so file offset inside the zip file
- object size = .so file size
PlatformAndroid requires this module spec to call DownloadModuleSlice in order
to download the .so file from the zip file using adb shell dd.
- file spec = "zip_path!/lib_path"
- file offset = .so file offset inside the zip file == dd skip parameter
- file size = .so file size == dd count parameter
And ObjectFileELF will calculate CRC32 if the ELF does not have GNU BuildID,
that will use the `data_sp` size. Which is set by `MapFileData`. Currently `-1`
== the whole zip file size. (In fact, lldb-server is crashing due to SIGSEGV.)
It is supposed to be the .so file size.
In the unittest, the test .so file has CRC32 `7D6E4738`. And it should be the
same for the file size.
offset-test.bin contains
-1024bytes of '\0'
- liboffset-test.so (file offset = 1024, file size = 3600, CRC32 '7D6E4738')
- 16bytes of '\0'
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D152757/new/
https://reviews.llvm.org/D152757
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