I assume you've actually done a debug build? Your command line works for me:
100$ $ ./Tools/Scripts/dump-class-layout --architecture=x86_64 -c Debug JavaScriptCore JSString +0 < 24> JSString +0 < 8> JSC::JSCell JSC::JSCell +0 < 1> JSC::HeapCell JSC::HeapCell +0 < 4> JSC::StructureID m_structureID +4 < 1> JSC::IndexingType m_indexingTypeAndMisc +5 < 1> JSC::JSType m_type +6 < 1> JSC::TypeInfo::InlineTypeFlags m_flags +7 < 1> JSC::CellState m_cellState +8 < 4> unsigned int m_length +12 < 2> uint16_t m_flags +14 < 2> <PADDING: 2 bytes> +16 < 8> WTF::String m_value +16 < 8> WTF::RefPtr<WTF::StringImpl, WTF::DumbPtrTraits<WTF::StringImpl> > m_impl +16 < 8> WTF::DumbPtrTraits<WTF::StringImpl>::StorageType m_ptr Total byte size: 24 Total pad bytes: 2 Padding percentage: 8.33 % BTW you should never work on class layouts in debug builds, since they may be different from shipping. There are some unit tests for dump-class-layout (they used to be run as part of webkitpy tests, but I think Dan changed that?). Do all the tests pass for you? Simon > On Nov 5, 2018, at 4:02 PM, Frank Jaeger <fjaege...@outlook.com> wrote: > > Hi Simon, thanks for your help. I am running the script on macOS Mojave 10.14 > and I'm pretty sure I have the lldb python bindings installed. Or otherwise > it should fail when importing them at the beginning of the script, right? > From what I understood by reading the script's code, it is directly calling > into the lldb binding to dump the class layout, and it's failing inside. > > As I've said before, the error it gives me implies that the provided > framework/class pair has not been found in the image, even though I am sure > that the pair is valid and found in the image (e.g. JSC::JSString). > Da: simon.fra...@apple.com <simon.fra...@apple.com> per conto di Simon Fraser > <simon.fra...@apple.com> > Inviato: lunedì 5 novembre 2018 14:17 > A: Frank Jaeger > Cc: webkit-dev@lists.webkit.org > Oggetto: Re: [webkit-dev] dump-class-layout script not working > > Dump-class-layout uses the lldb python bindings. Maybe those are not > available on your platform? > > I think we’ve only ever tried it on macOS. What platform are you trying on? > > Simon > >> On Nov 4, 2018, at 12:43 PM, Frank Jaeger <fjaege...@outlook.com >> <mailto:fjaege...@outlook.com>> wrote: >> >> Hello. First of all I'm really sorry if this is the wrong mailing list to >> post to, webkit-help would have probably been better but it doesn't seem >> very active. >> >> I run into some problems while trying to use the dump-class-layout script >> (found in Tools/Scripts/). I built WebKit using the build-webkit script with >> the --debug flag. >> >> After building, I tried to run the dump-class-layout script with the >> following arguments: >> >> ./Tools/Scripts/dump-class-layout --architecture=x86_64 -c Debug >> JavaScriptCore JSString >> >> I also tried different frameworks and classes. The script always fails >> telling me that "no type matches x in y" where x is the class name I used in >> the run and y is the framework name. >> >> Why is this happening? The script is correctly finding the built and >> symbolicated framework image, so why is it not working properly? Thanks in >> advance. >> _______________________________________________ >> webkit-dev mailing list >> webkit-dev@lists.webkit.org <mailto:webkit-dev@lists.webkit.org> >> https://lists.webkit.org/mailman/listinfo/webkit-dev >> <https://lists.webkit.org/mailman/listinfo/webkit-dev>
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