[llvm-dev] LLVM Newbie

[Bruce Hoult via llvm-dev]

There are always pretty big, and incompatible, changes between major LLVM
versions. Ideally, the publisher of your book would provide a site with
updates to their code.

The easiest thing for you to do is to get LLVM 3.5 and use that.

Or, you could do a diff between the 3.5 and 3.8 versions of the headers for
the classes you're inheriting from and see if there's been something like
an obvious simple renaming of methods.

On Tue, Apr 26, 2016 at 9:00 AM, Wolfgang McSneed via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> I am trying to write my own backend using LLVM and I downloaded the
> support files from the book titled "LLVM Cookbook" for the "Toy"
> architecture described in the book.
>
> I made the changes described in the book to register the TOY architecture
> but am seeing compile errors. I am not sure if I set this up correctly. The
> code that I am compiling for the backend was downloaded from the publisher
> and should be tested? (I think they used 3.5 whereas I am using 3.8.0)
>
> Any help would be much appreciated!
>
> Wolf
>
> [ 59%] Built target LLVMXCoreInfo
> [ 59%] Built target LLVMXCoreDesc
> [ 59%] Updating TOYGenRegisterInfo.inc...
> [ 59%] Updating TOYGenInstrInfo.inc...
> [ 60%] Updating TOYGenAsmWriter.inc...
> [ 60%] Updating TOYGenDAGISel.inc...
> [ 60%] Updating TOYGenCallingConv.inc...
> [ 60%] Updating TOYGenSubtargetInfo.inc...
> [ 60%] Updating TOYGenMCCodeEmitter.inc...
> [ 60%] Built target TOYCommonTableGen
> Scanning dependencies of target LLVMTOYCodeGen
> [ 60%] Building CXX object
> lib/Target/TOY/CMakeFiles/LLVMTOYCodeGen.dir/TOYSubtarget.cpp.o
> In file included from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYInstrInfo.h:17:0,
>                  from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.h:20,
>                  from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:14:
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYRegisterInfo.h:34:19:
> error: ‘const uint32_t*
> llvm::TOYRegisterInfo::getCallPreservedMask(llvm::CallingConv::ID) const’
> marked override, but does not override
>    const uint32_t *getCallPreservedMask(CallingConv::ID) const override;
>                    ^
> In file included from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:14:0:
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.h:69:21:
> error: ‘const llvm::DataLayout* llvm::TOYSubtarget::getDataLayout() const’
> marked override, but does not override
>    const DataLayout *getDataLayout() const override { return &DL; }
>                      ^
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.h:41:20:
> error: cannot declare field ‘llvm::TOYSubtarget::FrameLowering’ to be of
> abstract type ‘llvm::TOYFrameLowering’
>    TOYFrameLowering FrameLowering;
>                     ^
> In file included from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.h:18:0,
>                  from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:14:
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYFrameLowering.h:24:7:
> note:   because the following virtual functions are pure within
> ‘llvm::TOYFrameLowering’:
>  class TOYFrameLowering : public TargetFrameLowering {
>        ^
> In file included from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYFrameLowering.h:18:0,
>                  from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.h:18,
>                  from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:14:
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/include/llvm/Target/TargetFrameLowering.h:156:16:
> note: virtual void
> llvm::TargetFrameLowering::emitPrologue(llvm::MachineFunction&,
> llvm::MachineBasicBlock&) const
>    virtual void emitPrologue(MachineFunction &MF,
>                 ^
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:
> In constructor ‘llvm::TOYSubtarget::TOYSubtarget(const string&, const
> string&, const string&, llvm::TOYTargetMachine&)’:
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:32:58:
> error: no matching function for call to
> ‘llvm::TOYGenSubtargetInfo::TOYGenSubtargetInfo(const string&, const
> string&, const string&)’
>        InstrInfo(), TLInfo(TM), TSInfo(DL), FrameLowering() {}
>                                                           ^
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:32:58:
> note: candidate is:
> In file included from
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/lib/Target/TOY/TOYSubtarget.cpp:22:0:
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/build/lib/Target/TOY/TOYGenSubtargetInfo.inc:117:1:
> note: llvm::TOYGenSubtargetInfo::TOYGenSubtargetInfo(const llvm::Triple&,
> llvm::StringRef, llvm::StringRef)
>  TOYGenSubtargetInfo::TOYGenSubtargetInfo(const Triple &TT, StringRef CPU,
> StringRef FS)
>  ^
> /home/wolf/gang/llvm/llvm_build/llvm-3.8.0.src/build/lib/Target/TOY/TOYGenSubtargetInfo.inc:117:1:
> note:   no known conversion for argument 1 from ‘const string {aka const
> std::basic_string<char>}’ to ‘const llvm::Triple&’
> make[2]: ***
> [lib/Target/TOY/CMakeFiles/LLVMTOYCodeGen.dir/TOYSubtarget.cpp.o] Error 1
> make[1]: *** [lib/Target/TOY/CMakeFiles/LLVMTOYCodeGen.dir/all] Error 2
> make: *** [all] Error 2
>
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