[lldb-dev] [Bug 16526] New: New API to scan executable for architectures before creating a target

Sebastien Metrot meeloo at gmail.com
Mon Jul 8 11:38:51 PDT 2013

Hi Greg,

I understand your point. My use-case was not to enable parsing the module list but rather to be able to detect which archs are available in order to display a GUI control that let's the user choose which archs it wants to run on (and detect archs that we don't support right away such as ARM binaries on x86_64). That's why I tried to get the available archs for the executable module only.

What is the best way to reconcile both approaches?


On Jul 8, 2013, at 19:48 , Greg Clayton <gclayton at apple.com> wrote:

> Your change currently allows architectures to be enumerated, but not .o files in a .a file. If you look closely at what the internal code is doing when it enumerates the module specifications, it can get a list of all architectures _and_ all .o files. If we expose this publicly, I would rather see a new SBModuleSpec and SBModuleSpecList class be created, and then we should be able to add a static function to SBModule that returns a SBModuleSpecList:
> static SBModuleSpecList
> SBModule::GetModuleSpecifications (const char *path);
> This way we could take a universal .a file and get back a bunch of SBModuleSpec objects that represent the arch/objects in the .a file. Then we would need to have a function on SBTarget to add a module to a target using a SBModuleSpec.
> Greg
> On Jul 5, 2013, at 12:31 PM, meeloo at gmail.com wrote:
>> Hi,
>> Is there something I should do to have this patch proposal reviewed?
>> Thanks,
>> S.
>> On Jul 2, 2013, at 19:47 , bugzilla-daemon at llvm.org wrote:
>>> Bug ID	16526
>>> Summary	New API to scan executable for architectures before creating a target           
>>> Product	lldb
>>> Version	unspecified
>>> Hardware	All
>>> OS	All
>>> Status	NEW
>>> Severity	enhancement
>>> Priority	P
>>> Component	All Bugs
>>> Assignee	lldb-dev at cs.uiuc.edu
>>> Reporter	meeloo at meeloo.net
>>> Classification	Unclassified
>>> Created attachment 10807 [details]
>>> Diff to add lldb::SBDebugger::GetAvailableArchsFromFile
>>> As I haven't found a way to scan available architectures from executables I'd
>>> like to add that to the API. For now the only way to do somehow do that is to
>>> loop over all known archs and try to create the SBTarget. Depending on its
>>> success we mark the arch as valid or not. As you can guess this is very slow
>>> and can be made mauch better as lldb already has all the code needed to get
>>> this information without loading the full target. 
>>> The public API for this could be added to SBDebugger:
>>> static lldb::SBStringList lldb::SBDebugger::GetAvailableArchsFromFile(const
>>> char* filename);
>>> I have attached a patch implementing this feature.
>>> Cheers,
>>> S.
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