Registering a target

For running the llc tool in the TOY target architecture, it has to be registered with the llc tool. This recipe demonstrates which configuration files need to be modified to register a target. The build files are modified in this recipe.

How to do it…

To register a target with a static compiler, follow these steps:

1. First, add the entry of the TOY backend to llvm_root_dir/CMakeLists.txt:

   set(LLVM_ALL_TARGETS
     AArch64
     ARM
     …
     …
     TOY
     )

2. Then add the toy entry to llvm_root_dir/include/llvm/ADT/Triple.h:

   class Triple {
   public:
     enum ArchType {
       UnknownArch,
   
       arm,        // ARM (little endian): arm, armv.*, xscale
       armeb,      // ARM (big endian): armeb
       aarch64,    // AArch64 (little endian): aarch64
       …
      …
   
   toy     // TOY: toy
   };

3. Add the toy entry to llvm_root_dir/include/llvm/ MC/MCExpr.h:

   class MCSymbolRefExpr : public MCExpr {
   public:
   enum VariantKind {
   ...
   VK_TOY_LO,
   VK_TOY_HI,
   };

4. Add the toy entry to llvm_root_dir/include/llvm/ Support/ELF.h:

   enum {
   ...