LLVM daily talk correction of fifty-three Target Registration of

Before the text: Create a new LLVM backend differences first step documentation and code  mainly for the implementation of a new back-end Target Machine, a first step in a new back-end seven steps. After this step, there is an implicit content that is registered to the Target, so that other tools can be used LLVM your new target at runtime.

LLVM of official documents in order to Sparc, for example, made an example:

with

 

In fact, the code change has been great. The current registration code Target, and no longer the same place, and even include / llvm / Target / TargetRegistry.h are no longer exists. In this paper, the latest code RISCV as an example to show the code Target registration:

llvm/lib/Target/RISCV/TargetInfo/RISCVTargetInfo.cpp

extern "C" void LLVMInitializeRISCVTargetInfo() {
  RegisterTarget<Triple::riscv32> X(getTheRISCV32Target(), "riscv32",
                                    "32-bit RISC-V", "RISCV");
  RegisterTarget<Triple::riscv64> Y(getTheRISCV64Target(), "riscv64",
                                    "64-bit RISC-V", "RISCV");
}

llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp

// Force static initialization.
extern "C" void LLVMInitializeRISCVAsmPrinter() {
  RegisterAsmPrinter<RISCVAsmPrinter> X(getTheRISCV32Target());
  RegisterAsmPrinter<RISCVAsmPrinter> Y(getTheRISCV64Target());
}

We can see that the current structure of the code and documentation have been very different. To point this out, but also want to make subsequent contact less take some detours piece.

Reference documents: http://releases.llvm.org/8.0.0/docs/WritingAnLLVMBackend.html

Reference Code: LLVM / LLVM-Project  Latest the commit f58ef87

 

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Posted on 2019-06-02