1 //===--- CodeGenOptions.h ---------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the CodeGenOptions interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_FRONTEND_CODEGENOPTIONS_H
15 #define LLVM_CLANG_FRONTEND_CODEGENOPTIONS_H
22 /// CodeGenOptions - Track various options which control how the code
23 /// is optimized and passed to the backend.
24 class CodeGenOptions {
27 NoInlining, // Perform no inlining whatsoever.
28 NormalInlining, // Use the standard function inlining pass.
29 OnlyAlwaysInlining // Only run the always inlining pass.
32 enum ObjCDispatchMethodKind {
39 NoDebugInfo, // Don't generate debug info.
40 DebugLineTablesOnly, // Emit only debug info necessary for generating
41 // line number tables (-gline-tables-only).
42 LimitedDebugInfo, // Limit generated debug info to reduce size
43 // (-flimit-debug-info).
44 FullDebugInfo // Generate complete debug info.
48 GeneralDynamicTLSModel,
54 unsigned AsmVerbose : 1; ///< -dA, -fverbose-asm.
55 unsigned ObjCAutoRefCountExceptions : 1; ///< Whether ARC should be EH-safe.
56 unsigned CUDAIsDevice : 1; ///< Set when compiling for CUDA device.
57 unsigned CXAAtExit : 1; ///< Use __cxa_atexit for calling destructors.
58 unsigned CXXCtorDtorAliases: 1; ///< Emit complete ctors/dtors as linker
59 ///< aliases to base ctors when possible.
60 unsigned DataSections : 1; ///< Set when -fdata-sections is enabled.
61 unsigned DisableFPElim : 1; ///< Set when -fomit-frame-pointer is enabled.
62 unsigned DisableLLVMOpts : 1; ///< Don't run any optimizations, for use in
63 ///< getting .bc files that correspond to the
64 ///< internal state before optimizations are
66 unsigned DisableRedZone : 1; ///< Set when -mno-red-zone is enabled.
67 unsigned DisableTailCalls : 1; ///< Do not emit tail calls.
68 unsigned EmitDeclMetadata : 1; ///< Emit special metadata indicating what
69 ///< Decl* various IR entities came from. Only
70 ///< useful when running CodeGen as a
72 unsigned EmitGcovArcs : 1; ///< Emit coverage data files, aka. GCDA.
73 unsigned EmitGcovNotes : 1; ///< Emit coverage "notes" files, aka GCNO.
74 unsigned EmitOpenCLArgMetadata : 1; ///< Emit OpenCL kernel arg metadata.
75 unsigned EmitMicrosoftInlineAsm : 1; ///< Enable emission of MS-style inline
77 unsigned ForbidGuardVariables : 1; ///< Issue errors if C++ guard variables
79 unsigned FunctionSections : 1; ///< Set when -ffunction-sections is enabled.
80 unsigned HiddenWeakTemplateVTables : 1; ///< Emit weak vtables and RTTI for
81 ///< template classes with hidden visibility
82 unsigned HiddenWeakVTables : 1; ///< Emit weak vtables, RTTI, and thunks with
83 ///< hidden visibility.
84 unsigned InstrumentFunctions : 1; ///< Set when -finstrument-functions is
86 unsigned InstrumentForProfiling : 1; ///< Set when -pg is enabled.
87 unsigned LessPreciseFPMAD : 1; ///< Enable less precise MAD instructions to
89 unsigned MergeAllConstants : 1; ///< Merge identical constants.
90 unsigned NoCommon : 1; ///< Set when -fno-common or C++ is enabled.
91 unsigned NoDwarf2CFIAsm : 1; ///< Set when -fno-dwarf2-cfi-asm is enabled.
92 unsigned NoDwarfDirectoryAsm : 1; ///< Set when -fno-dwarf-directory-asm is
94 unsigned NoExecStack : 1; ///< Set when -Wa,--noexecstack is enabled.
95 unsigned NoGlobalMerge : 1; ///< Set when -mno-global-merge is enabled.
96 unsigned NoImplicitFloat : 1; ///< Set when -mno-implicit-float is enabled.
97 unsigned NoInfsFPMath : 1; ///< Assume FP arguments, results not +-Inf.
98 unsigned NoInline : 1; ///< Set when -fno-inline is enabled. Disables
99 ///< use of the inline keyword.
100 unsigned NoNaNsFPMath : 1; ///< Assume FP arguments, results not NaN.
101 unsigned NoZeroInitializedInBSS : 1; ///< -fno-zero-initialized-in-bss.
102 unsigned ObjCDispatchMethod : 2; ///< Method of Objective-C dispatch to use.
103 unsigned OmitLeafFramePointer : 1; ///< Set when -momit-leaf-frame-pointer is
105 unsigned OptimizationLevel : 3; ///< The -O[0-4] option specified.
106 unsigned OptimizeSize : 2; ///< If -Os (==1) or -Oz (==2) is specified.
107 unsigned RelaxAll : 1; ///< Relax all machine code instructions.
108 unsigned RelaxedAliasing : 1; ///< Set when -fno-strict-aliasing is enabled.
109 unsigned SaveTempLabels : 1; ///< Save temporary labels.
110 unsigned SimplifyLibCalls : 1; ///< Set when -fbuiltin is enabled.
111 unsigned SoftFloat : 1; ///< -soft-float.
112 unsigned StrictEnums : 1; ///< Optimize based on strict enum definition.
113 unsigned TimePasses : 1; ///< Set when -ftime-report is enabled.
114 unsigned UnitAtATime : 1; ///< Unused. For mirroring GCC optimization
116 unsigned UnrollLoops : 1; ///< Control whether loops are unrolled.
117 unsigned UnsafeFPMath : 1; ///< Allow unsafe floating point optzns.
118 unsigned UnwindTables : 1; ///< Emit unwind tables.
120 /// Attempt to use register sized accesses to bit-fields in structures, when
122 unsigned UseRegisterSizedBitfieldAccess : 1;
124 unsigned VerifyModule : 1; ///< Control whether the module should be run
125 ///< through the LLVM Verifier.
127 unsigned StackRealignment : 1; ///< Control whether to permit stack
129 unsigned UseInitArray : 1; ///< Control whether to use .init_array or
131 unsigned StackAlignment; ///< Overrides default stack alignment,
134 /// The code model to use (-mcmodel).
135 std::string CodeModel;
137 /// The filename with path we use for coverage files. The extension will be
139 std::string CoverageFile;
141 /// Enable additional debugging information.
142 std::string DebugPass;
144 /// The string to embed in debug information as the current working directory.
145 std::string DebugCompilationDir;
147 /// The kind of generated debug info.
148 DebugInfoKind DebugInfo;
150 /// The string to embed in the debug information for the compile unit, if
152 std::string DwarfDebugFlags;
154 /// The ABI to use for passing floating point arguments.
155 std::string FloatABI;
157 /// The float precision limit to use, if non-empty.
158 std::string LimitFloatPrecision;
160 /// The name of the bitcode file to link before optzns.
161 std::string LinkBitcodeFile;
163 /// The kind of inlining to perform.
164 InliningMethod Inlining;
166 /// The user provided name for the "main file", if non-empty. This is useful
167 /// in situations where the input file name does not match the original input
168 /// file, for example with -save-temps.
169 std::string MainFileName;
171 /// The name of the relocation model to use.
172 std::string RelocationModel;
174 /// If not an empty string, trap intrinsics are lowered to calls to this
175 /// function instead of to trap instructions.
176 std::string TrapFuncName;
178 /// A list of command-line options to forward to the LLVM backend.
179 std::vector<std::string> BackendOptions;
181 /// The user specified number of registers to be used for integral arguments,
182 /// or 0 if unspecified.
183 unsigned NumRegisterParameters;
185 /// The run-time penalty for bounds checking, or 0 to disable.
186 unsigned char BoundsChecking;
188 /// The default TLS model to use.
189 TLSModel DefaultTLSModel;
196 CXXCtorDtorAliases = 0;
201 DisableTailCalls = 0;
202 EmitDeclMetadata = 0;
205 EmitOpenCLArgMetadata = 0;
206 EmitMicrosoftInlineAsm = 0;
207 ForbidGuardVariables = 0;
208 FunctionSections = 0;
209 HiddenWeakTemplateVTables = 0;
210 HiddenWeakVTables = 0;
211 InstrumentFunctions = 0;
212 InstrumentForProfiling = 0;
213 LessPreciseFPMAD = 0;
214 MergeAllConstants = 1;
221 NoZeroInitializedInBSS = 0;
222 NumRegisterParameters = 0;
223 ObjCAutoRefCountExceptions = 0;
224 ObjCDispatchMethod = Legacy;
225 OmitLeafFramePointer = 0;
226 OptimizationLevel = 0;
231 SimplifyLibCalls = 1;
239 UseRegisterSizedBitfieldAccess = 0;
241 StackRealignment = 0;
246 DebugInfo = NoDebugInfo;
247 Inlining = NoInlining;
248 RelocationModel = "pic";
249 DefaultTLSModel = GeneralDynamicTLSModel;
252 ObjCDispatchMethodKind getObjCDispatchMethod() const {
253 return ObjCDispatchMethodKind(ObjCDispatchMethod);
257 } // end namespace clang