CodeGenOptions.h revision f24a151d645abc89f94aa58ad59f3131502041b1 
1//===--- CodeGenOptions.h ---------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file defines the CodeGenOptions interface.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_FRONTEND_CODEGENOPTIONS_H
15#define LLVM_CLANG_FRONTEND_CODEGENOPTIONS_H
16
17#include <string>
18#include <vector>
19
20namespace clang {
21
22/// CodeGenOptions - Track various options which control how the code
23/// is optimized and passed to the backend.
24class CodeGenOptions {
25public:
26  enum InliningMethod {
27    NoInlining,         // Perform no inlining whatsoever.
28    NormalInlining,     // Use the standard function inlining pass.
29    OnlyAlwaysInlining  // Only run the always inlining pass.
30  };
31
32  enum ObjCDispatchMethodKind {
33    Legacy = 0,
34    NonLegacy = 1,
35    Mixed = 2
36  };
37
38  unsigned AsmVerbose        : 1; /// -dA, -fverbose-asm.
39  unsigned CXAAtExit         : 1; /// Use __cxa_atexit for calling destructors.
40  unsigned CXXCtorDtorAliases: 1; /// Emit complete ctors/dtors as linker
41                                  /// aliases to base ctors when possible.
42  unsigned DataSections      : 1; /// Set when -fdata-sections is enabled
43  unsigned DebugInfo         : 1; /// Should generate debug info (-g).
44  unsigned LimitDebugInfo    : 1; /// Limit generated debug info to reduce size.
45  unsigned DisableFPElim     : 1; /// Set when -fomit-frame-pointer is enabled.
46  unsigned DisableLLVMOpts   : 1; /// Don't run any optimizations, for use in
47                                  /// getting .bc files that correspond to the
48                                  /// internal state before optimizations are
49                                  /// done.
50  unsigned DisableRedZone    : 1; /// Set when -mno-red-zone is enabled.
51  unsigned EmitDeclMetadata  : 1; /// Emit special metadata indicating what
52                                  /// Decl* various IR entities came from.  Only
53                                  /// useful when running CodeGen as a
54                                  /// subroutine.
55  unsigned EmitGcovArcs      : 1; /// Emit coverage data files, aka. GCDA.
56  unsigned EmitGcovNotes     : 1; /// Emit coverage "notes" files, aka GCNO.
57  unsigned ForbidGuardVariables : 1; /// Issue errors if C++ guard variables
58                                  /// are required
59  unsigned FunctionSections  : 1; /// Set when -ffunction-sections is enabled
60  unsigned HiddenWeakTemplateVTables : 1; /// Emit weak vtables and RTTI for
61                                  /// template classes with hidden visibility
62  unsigned HiddenWeakVTables : 1; /// Emit weak vtables, RTTI, and thunks with
63                                  /// hidden visibility.
64  unsigned InstrumentFunctions : 1; /// Set when -finstrument-functions is
65                                    /// enabled.
66  unsigned InstrumentForProfiling : 1; /// Set when -pg is enabled
67  unsigned LessPreciseFPMAD  : 1; /// Enable less precise MAD instructions to be
68                                  /// generated.
69  unsigned MergeAllConstants : 1; /// Merge identical constants.
70  unsigned NoCommon          : 1; /// Set when -fno-common or C++ is enabled.
71  unsigned NoDwarf2CFIAsm    : 1; /// Set when -fno-dwarf2-cfi-asm is enabled.
72  unsigned NoImplicitFloat   : 1; /// Set when -mno-implicit-float is enabled.
73  unsigned NoInfsFPMath      : 1; /// Assume FP arguments, results not +-Inf.
74  unsigned NoNaNsFPMath      : 1; /// Assume FP arguments, results not NaN.
75  unsigned NoZeroInitializedInBSS : 1; /// -fno-zero-initialized-in-bss
76  unsigned ObjCDispatchMethod : 2; /// Method of Objective-C dispatch to use.
77  unsigned OmitLeafFramePointer : 1; /// Set when -momit-leaf-frame-pointer is
78                                     /// enabled.
79  unsigned OptimizationLevel : 3; /// The -O[0-4] option specified.
80  unsigned OptimizeSize      : 2; /// If -Os (==1) or -Oz (==2) is specified.
81  unsigned RelaxAll          : 1; /// Relax all machine code instructions.
82  unsigned RelaxedAliasing   : 1; /// Set when -fno-strict-aliasing is enabled.
83  unsigned SaveTempLabels    : 1; /// Save temporary labels.
84  unsigned SimplifyLibCalls  : 1; /// Set when -fbuiltin is enabled.
85  unsigned SoftFloat         : 1; /// -soft-float.
86  unsigned TimePasses        : 1; /// Set when -ftime-report is enabled.
87  unsigned UnitAtATime       : 1; /// Unused. For mirroring GCC optimization
88                                  /// selection.
89  unsigned UnrollLoops       : 1; /// Control whether loops are unrolled.
90  unsigned UnsafeFPMath      : 1; /// Allow unsafe floating point optzns.
91  unsigned UnwindTables      : 1; /// Emit unwind tables.
92  unsigned VerifyModule      : 1; /// Control whether the module should be run
93                                  /// through the LLVM Verifier.
94
95  /// The code model to use (-mcmodel).
96  std::string CodeModel;
97
98  /// Enable additional debugging information.
99  std::string DebugPass;
100
101  /// The string to embed in the debug information for the compile unit, if
102  /// non-empty.
103  std::string DwarfDebugFlags;
104
105  /// The ABI to use for passing floating point arguments.
106  std::string FloatABI;
107
108  /// The float precision limit to use, if non-empty.
109  std::string LimitFloatPrecision;
110
111  /// The kind of inlining to perform.
112  InliningMethod Inlining;
113
114  /// The user provided name for the "main file", if non-empty. This is useful
115  /// in situations where the input file name does not match the original input
116  /// file, for example with -save-temps.
117  std::string MainFileName;
118
119  /// The name of the relocation model to use.
120  std::string RelocationModel;
121
122  /// A list of command-line options to forward to the LLVM backend.
123  std::vector<std::string> BackendOptions;
124
125  /// The user specified number of registers to be used for integral arguments,
126  /// or 0 if unspecified.
127  unsigned NumRegisterParameters;
128
129public:
130  CodeGenOptions() {
131    AsmVerbose = 0;
132    CXAAtExit = 1;
133    CXXCtorDtorAliases = 0;
134    DataSections = 0;
135    DebugInfo = 0;
136    LimitDebugInfo = 0;
137    DisableFPElim = 0;
138    DisableLLVMOpts = 0;
139    DisableRedZone = 0;
140    EmitDeclMetadata = 0;
141    EmitGcovArcs = 0;
142    EmitGcovNotes = 0;
143    ForbidGuardVariables = 0;
144    FunctionSections = 0;
145    HiddenWeakTemplateVTables = 0;
146    HiddenWeakVTables = 0;
147    InstrumentFunctions = 0;
148    InstrumentForProfiling = 0;
149    LessPreciseFPMAD = 0;
150    MergeAllConstants = 1;
151    NoCommon = 0;
152    NoDwarf2CFIAsm = 0;
153    NoImplicitFloat = 0;
154    NoInfsFPMath = 0;
155    NoNaNsFPMath = 0;
156    NoZeroInitializedInBSS = 0;
157    NumRegisterParameters = 0;
158    ObjCDispatchMethod = Legacy;
159    OmitLeafFramePointer = 0;
160    OptimizationLevel = 0;
161    OptimizeSize = 0;
162    RelaxAll = 0;
163    RelaxedAliasing = 0;
164    SaveTempLabels = 0;
165    SimplifyLibCalls = 1;
166    SoftFloat = 0;
167    TimePasses = 0;
168    UnitAtATime = 1;
169    UnrollLoops = 0;
170    UnsafeFPMath = 0;
171    UnwindTables = 0;
172    VerifyModule = 1;
173
174    Inlining = NoInlining;
175    RelocationModel = "pic";
176  }
177
178  ObjCDispatchMethodKind getObjCDispatchMethod() const {
179    return ObjCDispatchMethodKind(ObjCDispatchMethod);
180  }
181};
182
183}  // end namespace clang
184
185#endif
186