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      1 //===-- llvm/Support/CodeGen.h - CodeGen Concepts ---------------*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 //
      9 // This file define some types which define code generation concepts. For
     10 // example, relocation model.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #ifndef LLVM_SUPPORT_CODEGEN_H
     15 #define LLVM_SUPPORT_CODEGEN_H
     16 
     17 namespace llvm {
     18 
     19   // Relocation model types.
     20   namespace Reloc {
     21     // Cannot be named PIC due to collision with -DPIC
     22     enum Model { Static, PIC_, DynamicNoPIC, ROPI, RWPI, ROPI_RWPI };
     23   }
     24 
     25   // Code model types.
     26   namespace CodeModel {
     27     // Sync changes with CodeGenCWrappers.h.
     28     enum Model { Tiny, Small, Kernel, Medium, Large };
     29   }
     30 
     31   namespace PICLevel {
     32     // This is used to map -fpic/-fPIC.
     33     enum Level { NotPIC=0, SmallPIC=1, BigPIC=2 };
     34   }
     35 
     36   namespace PIELevel {
     37     enum Level { Default=0, Small=1, Large=2 };
     38   }
     39 
     40   // TLS models.
     41   namespace TLSModel {
     42     enum Model {
     43       GeneralDynamic,
     44       LocalDynamic,
     45       InitialExec,
     46       LocalExec
     47     };
     48   }
     49 
     50   // Code generation optimization level.
     51   namespace CodeGenOpt {
     52     enum Level {
     53       None = 0,      // -O0
     54       Less = 1,      // -O1
     55       Default = 2,   // -O2, -Os
     56       Aggressive = 3 // -O3
     57     };
     58   }
     59 
     60   /// These enums are meant to be passed into addPassesToEmitFile to indicate
     61   /// what type of file to emit, and returned by it to indicate what type of
     62   /// file could actually be made.
     63   enum CodeGenFileType {
     64     CGFT_AssemblyFile,
     65     CGFT_ObjectFile,
     66     CGFT_Null         // Do not emit any output.
     67   };
     68 
     69   // Specify what functions should keep the frame pointer.
     70   enum class FramePointerKind { None, NonLeaf, All };
     71 
     72 }  // end llvm namespace
     73 
     74 #endif
     75