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| 14 | pmbaty | 1 | //===-- llvm/Support/CodeGen.h - CodeGen Concepts ---------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file define some types which define code generation concepts. For |
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| 10 | // example, relocation model. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |||
| 14 | #ifndef LLVM_SUPPORT_CODEGEN_H |
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| 15 | #define LLVM_SUPPORT_CODEGEN_H |
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| 16 | |||
| 17 | #include <cstdint> |
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| 18 | #include <optional> |
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| 19 | |||
| 20 | namespace llvm { |
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| 21 | |||
| 22 | // Relocation model types. |
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| 23 | namespace Reloc { |
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| 24 | // Cannot be named PIC due to collision with -DPIC |
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| 25 | enum Model { Static, PIC_, DynamicNoPIC, ROPI, RWPI, ROPI_RWPI }; |
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| 26 | } |
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| 27 | |||
| 28 | // Code model types. |
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| 29 | namespace CodeModel { |
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| 30 | // Sync changes with CodeGenCWrappers.h. |
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| 31 | enum Model { Tiny, Small, Kernel, Medium, Large }; |
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| 32 | } |
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| 33 | |||
| 34 | namespace PICLevel { |
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| 35 | // This is used to map -fpic/-fPIC. |
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| 36 | enum Level { NotPIC=0, SmallPIC=1, BigPIC=2 }; |
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| 37 | } |
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| 38 | |||
| 39 | namespace PIELevel { |
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| 40 | enum Level { Default=0, Small=1, Large=2 }; |
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| 41 | } |
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| 42 | |||
| 43 | // TLS models. |
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| 44 | namespace TLSModel { |
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| 45 | enum Model { |
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| 46 | GeneralDynamic, |
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| 47 | LocalDynamic, |
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| 48 | InitialExec, |
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| 49 | LocalExec |
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| 50 | }; |
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| 51 | } |
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| 52 | |||
| 53 | namespace CodeGenOpt { |
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| 54 | /// Type for the unique integer IDs of code generation optimization levels. |
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| 55 | using IDType = int; |
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| 56 | /// Code generation optimization level. |
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| 57 | enum Level : IDType { |
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| 58 | None = 0, ///< -O0 |
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| 59 | Less = 1, ///< -O1 |
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| 60 | Default = 2, ///< -O2, -Os |
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| 61 | Aggressive = 3 ///< -O3 |
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| 62 | }; |
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| 63 | /// Get the \c Level identified by the integer \p ID. |
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| 64 | /// |
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| 65 | /// Returns std::nullopt if \p ID is invalid. |
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| 66 | inline std::optional<Level> getLevel(IDType ID) { |
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| 67 | if (ID < 0 || ID > 3) |
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| 68 | return std::nullopt; |
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| 69 | return static_cast<Level>(ID); |
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| 70 | } |
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| 71 | /// Parse \p C as a single digit integer ID and get matching \c Level. |
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| 72 | /// |
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| 73 | /// Returns std::nullopt if the input is not a valid digit or not a valid ID. |
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| 74 | inline std::optional<Level> parseLevel(char C) { |
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| 75 | if (C < '0') |
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| 76 | return std::nullopt; |
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| 77 | return getLevel(static_cast<IDType>(C - '0')); |
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| 78 | } |
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| 79 | } // namespace CodeGenOpt |
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| 80 | |||
| 81 | /// These enums are meant to be passed into addPassesToEmitFile to indicate |
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| 82 | /// what type of file to emit, and returned by it to indicate what type of |
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| 83 | /// file could actually be made. |
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| 84 | enum CodeGenFileType { |
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| 85 | CGFT_AssemblyFile, |
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| 86 | CGFT_ObjectFile, |
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| 87 | CGFT_Null // Do not emit any output. |
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| 88 | }; |
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| 89 | |||
| 90 | // Specify what functions should keep the frame pointer. |
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| 91 | enum class FramePointerKind { None, NonLeaf, All }; |
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| 92 | |||
| 93 | // Specify what type of zeroing callee-used registers. |
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| 94 | namespace ZeroCallUsedRegs { |
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| 95 | const unsigned ONLY_USED = 1U << 1; |
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| 96 | const unsigned ONLY_GPR = 1U << 2; |
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| 97 | const unsigned ONLY_ARG = 1U << 3; |
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| 98 | |||
| 99 | enum class ZeroCallUsedRegsKind : unsigned int { |
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| 100 | // Don't zero any call-used regs. |
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| 101 | Skip = 1U << 0, |
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| 102 | // Only zeros call-used GPRs used in the fn and pass args. |
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| 103 | UsedGPRArg = ONLY_USED | ONLY_GPR | ONLY_ARG, |
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| 104 | // Only zeros call-used GPRs used in the fn. |
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| 105 | UsedGPR = ONLY_USED | ONLY_GPR, |
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| 106 | // Only zeros call-used regs used in the fn and pass args. |
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| 107 | UsedArg = ONLY_USED | ONLY_ARG, |
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| 108 | // Only zeros call-used regs used in the fn. |
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| 109 | Used = ONLY_USED, |
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| 110 | // Zeros all call-used GPRs that pass args. |
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| 111 | AllGPRArg = ONLY_GPR | ONLY_ARG, |
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| 112 | // Zeros all call-used GPRs. |
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| 113 | AllGPR = ONLY_GPR, |
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| 114 | // Zeros all call-used regs that pass args. |
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| 115 | AllArg = ONLY_ARG, |
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| 116 | // Zeros all call-used regs. |
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| 117 | All = 0, |
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| 118 | }; |
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| 119 | } // namespace ZeroCallUsedRegs |
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| 120 | |||
| 121 | enum class UWTableKind { |
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| 122 | None = 0, ///< No unwind table requested |
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| 123 | Sync = 1, ///< "Synchronous" unwind tables |
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| 124 | Async = 2, ///< "Asynchronous" unwind tables (instr precise) |
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| 125 | Default = 2, |
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| 126 | }; |
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| 127 | |||
| 128 | enum class FunctionReturnThunksKind : unsigned int { |
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| 129 | Keep = 0, ///< No function return thunk. |
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| 130 | Extern = 1, ///< Replace returns with jump to thunk, don't emit thunk. |
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| 131 | Invalid = 2, ///< Not used. |
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| 132 | }; |
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| 133 | |||
| 134 | } // namespace llvm |
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| 135 | |||
| 136 | #endif |