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 {
38 unsigned AsmVerbose : 1; /// -dA, -fverbose-asm.
39 unsigned ObjCAutoRefCountExceptions : 1; /// Whether ARC should be EH-safe.
40 unsigned CXAAtExit : 1; /// Use __cxa_atexit for calling destructors.
41 unsigned CXXCtorDtorAliases: 1; /// Emit complete ctors/dtors as linker
42 /// aliases to base ctors when possible.
43 unsigned DataSections : 1; /// Set when -fdata-sections is enabled
44 unsigned DebugInfo : 1; /// Should generate debug info (-g).
45 unsigned LimitDebugInfo : 1; /// Limit generated debug info to reduce size.
46 unsigned DisableFPElim : 1; /// Set when -fomit-frame-pointer is enabled.
47 unsigned DisableLLVMOpts : 1; /// Don't run any optimizations, for use in
48 /// getting .bc files that correspond to the
49 /// internal state before optimizations are
51 unsigned DisableRedZone : 1; /// Set when -mno-red-zone is enabled.
52 unsigned EmitDeclMetadata : 1; /// Emit special metadata indicating what
53 /// Decl* various IR entities came from. Only
54 /// useful when running CodeGen as a
56 unsigned EmitGcovArcs : 1; /// Emit coverage data files, aka. GCDA.
57 unsigned EmitGcovNotes : 1; /// Emit coverage "notes" files, aka GCNO.
58 unsigned ForbidGuardVariables : 1; /// Issue errors if C++ guard variables
60 unsigned FunctionSections : 1; /// Set when -ffunction-sections is enabled
61 unsigned HiddenWeakTemplateVTables : 1; /// Emit weak vtables and RTTI for
62 /// template classes with hidden visibility
63 unsigned HiddenWeakVTables : 1; /// Emit weak vtables, RTTI, and thunks with
64 /// hidden visibility.
65 unsigned InstrumentFunctions : 1; /// Set when -finstrument-functions is
67 unsigned InstrumentForProfiling : 1; /// Set when -pg is enabled
68 unsigned LessPreciseFPMAD : 1; /// Enable less precise MAD instructions to be
70 unsigned MergeAllConstants : 1; /// Merge identical constants.
71 unsigned NoCommon : 1; /// Set when -fno-common or C++ is enabled.
72 unsigned NoDwarf2CFIAsm : 1; /// Set when -fno-dwarf2-cfi-asm is enabled.
73 unsigned NoExecStack : 1; /// Set when -Wa,--noexecstack is enabled.
74 unsigned NoImplicitFloat : 1; /// Set when -mno-implicit-float is enabled.
75 unsigned NoInfsFPMath : 1; /// Assume FP arguments, results not +-Inf.
76 unsigned NoNaNsFPMath : 1; /// Assume FP arguments, results not NaN.
77 unsigned NoZeroInitializedInBSS : 1; /// -fno-zero-initialized-in-bss
78 unsigned ObjCDispatchMethod : 2; /// Method of Objective-C dispatch to use.
79 unsigned ObjCRuntimeHasARC : 1; /// The target runtime supports ARC natively
80 unsigned ObjCRuntimeHasTerminate : 1; /// The ObjC runtime has objc_terminate
81 unsigned OmitLeafFramePointer : 1; /// Set when -momit-leaf-frame-pointer is
83 unsigned OptimizationLevel : 3; /// The -O[0-4] option specified.
84 unsigned OptimizeSize : 2; /// If -Os (==1) or -Oz (==2) is specified.
85 unsigned RelaxAll : 1; /// Relax all machine code instructions.
86 unsigned RelaxedAliasing : 1; /// Set when -fno-strict-aliasing is enabled.
87 unsigned SaveTempLabels : 1; /// Save temporary labels.
88 unsigned SimplifyLibCalls : 1; /// Set when -fbuiltin is enabled.
89 unsigned SoftFloat : 1; /// -soft-float.
90 unsigned TimePasses : 1; /// Set when -ftime-report is enabled.
91 unsigned UnitAtATime : 1; /// Unused. For mirroring GCC optimization
93 unsigned UnrollLoops : 1; /// Control whether loops are unrolled.
94 unsigned UnsafeFPMath : 1; /// Allow unsafe floating point optzns.
95 unsigned UnwindTables : 1; /// Emit unwind tables.
97 /// Attempt to use register sized accesses to bit-fields in structures, when
99 unsigned UseRegisterSizedBitfieldAccess : 1;
101 unsigned VerifyModule : 1; /// Control whether the module should be run
102 /// through the LLVM Verifier.
104 /// The code model to use (-mcmodel).
105 std::string CodeModel;
107 /// The filename with path we use for coverage files. The extension will be
109 std::string CoverageFile;
111 /// Enable additional debugging information.
112 std::string DebugPass;
114 /// The string to embed in the debug information for the compile unit, if
116 std::string DwarfDebugFlags;
118 /// The ABI to use for passing floating point arguments.
119 std::string FloatABI;
121 /// The float precision limit to use, if non-empty.
122 std::string LimitFloatPrecision;
124 /// The kind of inlining to perform.
125 InliningMethod Inlining;
127 /// The user provided name for the "main file", if non-empty. This is useful
128 /// in situations where the input file name does not match the original input
129 /// file, for example with -save-temps.
130 std::string MainFileName;
132 /// The name of the relocation model to use.
133 std::string RelocationModel;
135 /// A list of command-line options to forward to the LLVM backend.
136 std::vector<std::string> BackendOptions;
138 /// The user specified number of registers to be used for integral arguments,
139 /// or 0 if unspecified.
140 unsigned NumRegisterParameters;
146 CXXCtorDtorAliases = 0;
153 EmitDeclMetadata = 0;
156 ForbidGuardVariables = 0;
157 FunctionSections = 0;
158 HiddenWeakTemplateVTables = 0;
159 HiddenWeakVTables = 0;
160 InstrumentFunctions = 0;
161 InstrumentForProfiling = 0;
162 LessPreciseFPMAD = 0;
163 MergeAllConstants = 1;
169 NoZeroInitializedInBSS = 0;
170 NumRegisterParameters = 0;
171 ObjCAutoRefCountExceptions = 0;
172 ObjCDispatchMethod = Legacy;
173 ObjCRuntimeHasARC = 0;
174 ObjCRuntimeHasTerminate = 0;
175 OmitLeafFramePointer = 0;
176 OptimizationLevel = 0;
181 SimplifyLibCalls = 1;
188 UseRegisterSizedBitfieldAccess = 0;
191 Inlining = NoInlining;
192 RelocationModel = "pic";
195 ObjCDispatchMethodKind getObjCDispatchMethod() const {
196 return ObjCDispatchMethodKind(ObjCDispatchMethod);
200 } // end namespace clang