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