debug/macho: No support for objc sections such as __objc_data

[fabiensanglard]

No description provided.

[minux]

Why do you think debug/macho only supports 64-bit segments?

[fabiensanglard]

Checkout the struct segment_command and segment_command_64 on apple documentation page: https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/MachORuntime/index.html#//apple_ref/doc/uid/20001298-89026

The size of the fields declared in the go struct SegmentHeader match segment_command_64 but are wrong is you read a segment_command (from a 32 bits binary)

[minux]

That's because the package will automatically translate the struct so that portable code only need to handle one type that is big enough to hold both kinds of segment headers. http://golang.org/src/debug/macho/file.go#L317

[fabiensanglard]

I completely missed this part :) ! Renaming to "no support for objc sections"

[minux]

Could you please elaborate what do you expect for objc support?

[fabiensanglard]

I want to add ability to parse objc class, method, category and prototypes

[minux]

That's definitely out of scope for debug/macho.

[fabiensanglard]

Please elaborate. Why not add support to parse objc ? What is the scope of debug/macho ?

[minux]

The main reason debug/macho exists is because of cmd/cgo needs it to read the section contents. Interpreting the contents of sections is generally out-of-scope for that package (unless interpreting the content helps accessing other information in the file, for example, symtab) Parsing the objc stuff doesn't need to be in the standard library, it's perfectly fine for a go-gettable package.