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1//===-- llvm/Target/TargetOptions.h - Target Options ------------*- 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 command line option flags that are shared across various
11// targets.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_TARGET_TARGETOPTIONS_H
16#define LLVM_TARGET_TARGETOPTIONS_H
17
18#include "llvm/MC/MCTargetOptions.h"
19
20namespace llvm {
21 class MachineFunction;
22 class Module;
23
24 namespace FloatABI {
25 enum ABIType {
26 Default, // Target-specific (either soft or hard depending on triple, etc).
27 Soft, // Soft float.
28 Hard // Hard float.
29 };
30 }
31
32 namespace FPOpFusion {
33 enum FPOpFusionMode {
34 Fast, // Enable fusion of FP ops wherever it's profitable.
35 Standard, // Only allow fusion of 'blessed' ops (currently just fmuladd).
36 Strict // Never fuse FP-ops.
37 };
38 }
39
40 namespace JumpTable {
41 enum JumpTableType {
42 Single, // Use a single table for all indirect jumptable calls.
43 Arity, // Use one table per number of function parameters.
44 Simplified, // Use one table per function type, with types projected
45 // into 4 types: pointer to non-function, struct,
46 // primitive, and function pointer.
47 Full // Use one table per unique function type
48 };
49 }
50
51 namespace ThreadModel {
52 enum Model {
53 POSIX, // POSIX Threads
54 Single // Single Threaded Environment
55 };
56 }
57
58 namespace FPDenormal {
59 enum DenormalMode {
60 IEEE, // IEEE 754 denormal numbers
61 PreserveSign, // the sign of a flushed-to-zero number is preserved in
62 // the sign of 0
63 PositiveZero // denormals are flushed to positive zero
64 };
65 }
66
67 enum class EABI {
68 Unknown,
69 Default, // Default means not specified
70 EABI4, // Target-specific (either 4, 5 or gnu depending on triple).
71 EABI5,
72 GNU
73 };
74
75 /// Identify a debugger for "tuning" the debug info.
76 ///
77 /// The "debugger tuning" concept allows us to present a more intuitive
78 /// interface that unpacks into different sets of defaults for the various
79 /// individual feature-flag settings, that suit the preferences of the
80 /// various debuggers. However, it's worth remembering that debuggers are
81 /// not the only consumers of debug info, and some variations in DWARF might
82 /// better be treated as target/platform issues. Fundamentally,
83 /// o if the feature is useful (or not) to a particular debugger, regardless
84 /// of the target, that's a tuning decision;
85 /// o if the feature is useful (or not) on a particular platform, regardless
86 /// of the debugger, that's a target decision.
87 /// It's not impossible to see both factors in some specific case.
88 ///
89 /// The "tuning" should be used to set defaults for individual feature flags
90 /// in DwarfDebug; if a given feature has a more specific command-line option,
91 /// that option should take precedence over the tuning.
92 enum class DebuggerKind {
93 Default, // No specific tuning requested.
94 GDB, // Tune debug info for gdb.
95 LLDB, // Tune debug info for lldb.
96 SCE // Tune debug info for SCE targets (e.g. PS4).
97 };
98
99 class TargetOptions {
100 public:
101 TargetOptions()
102 : PrintMachineCode(false), UnsafeFPMath(false), NoInfsFPMath(false),
103 NoNaNsFPMath(false), NoTrappingFPMath(false),
104 NoSignedZerosFPMath(false),
105 HonorSignDependentRoundingFPMathOption(false), NoZerosInBSS(false),
106 GuaranteedTailCallOpt(false), StackSymbolOrdering(true),
107 EnableFastISel(false), EnableGlobalISel(false), UseInitArray(false),
108 DisableIntegratedAS(false), RelaxELFRelocations(false),
109 FunctionSections(false), DataSections(false),
110 UniqueSectionNames(true), TrapUnreachable(false),
111 NoTrapAfterNoreturn(false), EmulatedTLS(false),
112 ExplicitEmulatedTLS(false), EnableIPRA(false),
113 EmitStackSizeSection(false), EnableMachineOutliner(false),
114 SupportsDefaultOutlining(false), EmitAddrsig(false) {}
115
116 /// PrintMachineCode - This flag is enabled when the -print-machineinstrs
117 /// option is specified on the command line, and should enable debugging
118 /// output from the code generator.
119 unsigned PrintMachineCode : 1;
120
121 /// DisableFramePointerElim - This returns true if frame pointer elimination
122 /// optimization should be disabled for the given machine function.
123 bool DisableFramePointerElim(const MachineFunction &MF) const;
124
125 /// UnsafeFPMath - This flag is enabled when the
126 /// -enable-unsafe-fp-math flag is specified on the command line. When
127 /// this flag is off (the default), the code generator is not allowed to
128 /// produce results that are "less precise" than IEEE allows. This includes
129 /// use of X86 instructions like FSIN and FCOS instead of libcalls.
130 unsigned UnsafeFPMath : 1;
131
132 /// NoInfsFPMath - This flag is enabled when the
133 /// -enable-no-infs-fp-math flag is specified on the command line. When
134 /// this flag is off (the default), the code generator is not allowed to
135 /// assume the FP arithmetic arguments and results are never +-Infs.
136 unsigned NoInfsFPMath : 1;
137
138 /// NoNaNsFPMath - This flag is enabled when the
139 /// -enable-no-nans-fp-math flag is specified on the command line. When
140 /// this flag is off (the default), the code generator is not allowed to
141 /// assume the FP arithmetic arguments and results are never NaNs.
142 unsigned NoNaNsFPMath : 1;
143
144 /// NoTrappingFPMath - This flag is enabled when the
145 /// -enable-no-trapping-fp-math is specified on the command line. This
146 /// specifies that there are no trap handlers to handle exceptions.
147 unsigned NoTrappingFPMath : 1;
148
149 /// NoSignedZerosFPMath - This flag is enabled when the
150 /// -enable-no-signed-zeros-fp-math is specified on the command line. This
151 /// specifies that optimizations are allowed to treat the sign of a zero
152 /// argument or result as insignificant.
153 unsigned NoSignedZerosFPMath : 1;
154
155 /// HonorSignDependentRoundingFPMath - This returns true when the
156 /// -enable-sign-dependent-rounding-fp-math is specified. If this returns
157 /// false (the default), the code generator is allowed to assume that the
158 /// rounding behavior is the default (round-to-zero for all floating point
159 /// to integer conversions, and round-to-nearest for all other arithmetic
160 /// truncations). If this is enabled (set to true), the code generator must
161 /// assume that the rounding mode may dynamically change.
162 unsigned HonorSignDependentRoundingFPMathOption : 1;
163 bool HonorSignDependentRoundingFPMath() const;
164
165 /// NoZerosInBSS - By default some codegens place zero-initialized data to
166 /// .bss section. This flag disables such behaviour (necessary, e.g. for
167 /// crt*.o compiling).
168 unsigned NoZerosInBSS : 1;
169
170 /// GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is
171 /// specified on the commandline. When the flag is on, participating targets
172 /// will perform tail call optimization on all calls which use the fastcc
173 /// calling convention and which satisfy certain target-independent
174 /// criteria (being at the end of a function, having the same return type
175 /// as their parent function, etc.), using an alternate ABI if necessary.
176 unsigned GuaranteedTailCallOpt : 1;
177
178 /// StackAlignmentOverride - Override default stack alignment for target.
179 unsigned StackAlignmentOverride = 0;
180
181 /// StackSymbolOrdering - When true, this will allow CodeGen to order
182 /// the local stack symbols (for code size, code locality, or any other
183 /// heuristics). When false, the local symbols are left in whatever order
184 /// they were generated. Default is true.
185 unsigned StackSymbolOrdering : 1;
186
187 /// EnableFastISel - This flag enables fast-path instruction selection
188 /// which trades away generated code quality in favor of reducing
189 /// compile time.
190 unsigned EnableFastISel : 1;
191
192 /// EnableGlobalISel - This flag enables global instruction selection.
193 unsigned EnableGlobalISel : 1;
194
195 /// UseInitArray - Use .init_array instead of .ctors for static
196 /// constructors.
197 unsigned UseInitArray : 1;
198
199 /// Disable the integrated assembler.
200 unsigned DisableIntegratedAS : 1;
201
202 /// Compress DWARF debug sections.
203 DebugCompressionType CompressDebugSections = DebugCompressionType::None;
204
205 unsigned RelaxELFRelocations : 1;
206
207 /// Emit functions into separate sections.
208 unsigned FunctionSections : 1;
209
210 /// Emit data into separate sections.
211 unsigned DataSections : 1;
212
213 unsigned UniqueSectionNames : 1;
214
215 /// Emit target-specific trap instruction for 'unreachable' IR instructions.
216 unsigned TrapUnreachable : 1;
217
218 /// Do not emit a trap instruction for 'unreachable' IR instructions behind
219 /// noreturn calls, even if TrapUnreachable is true.
220 unsigned NoTrapAfterNoreturn : 1;
221
222 /// EmulatedTLS - This flag enables emulated TLS model, using emutls
223 /// function in the runtime library..
224 unsigned EmulatedTLS : 1;
225
226 /// Whether -emulated-tls or -no-emulated-tls is set.
227 unsigned ExplicitEmulatedTLS : 1;
228
229 /// This flag enables InterProcedural Register Allocation (IPRA).
230 unsigned EnableIPRA : 1;
231
232 /// Emit section containing metadata on function stack sizes.
233 unsigned EmitStackSizeSection : 1;
234
235 /// Enables the MachineOutliner pass.
236 unsigned EnableMachineOutliner : 1;
237
238 /// Set if the target supports default outlining behaviour.
239 unsigned SupportsDefaultOutlining : 1;
240
241 /// Emit address-significance table.
242 unsigned EmitAddrsig : 1;
243
244 /// FloatABIType - This setting is set by -float-abi=xxx option is specfied
245 /// on the command line. This setting may either be Default, Soft, or Hard.
246 /// Default selects the target's default behavior. Soft selects the ABI for
247 /// software floating point, but does not indicate that FP hardware may not
248 /// be used. Such a combination is unfortunately popular (e.g.
249 /// arm-apple-darwin). Hard presumes that the normal FP ABI is used.
250 FloatABI::ABIType FloatABIType = FloatABI::Default;
251
252 /// AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option.
253 /// This controls the creation of fused FP ops that store intermediate
254 /// results in higher precision than IEEE allows (E.g. FMAs).
255 ///
256 /// Fast mode - allows formation of fused FP ops whenever they're
257 /// profitable.
258 /// Standard mode - allow fusion only for 'blessed' FP ops. At present the
259 /// only blessed op is the fmuladd intrinsic. In the future more blessed ops
260 /// may be added.
261 /// Strict mode - allow fusion only if/when it can be proven that the excess
262 /// precision won't effect the result.
263 ///
264 /// Note: This option only controls formation of fused ops by the
265 /// optimizers. Fused operations that are explicitly specified (e.g. FMA
266 /// via the llvm.fma.* intrinsic) will always be honored, regardless of
267 /// the value of this option.
268 FPOpFusion::FPOpFusionMode AllowFPOpFusion = FPOpFusion::Standard;
269
270 /// ThreadModel - This flag specifies the type of threading model to assume
271 /// for things like atomics
272 ThreadModel::Model ThreadModel = ThreadModel::POSIX;
273
274 /// EABIVersion - This flag specifies the EABI version
275 EABI EABIVersion = EABI::Default;
276
277 /// Which debugger to tune for.
278 DebuggerKind DebuggerTuning = DebuggerKind::Default;
279
280 /// FPDenormalMode - This flags specificies which denormal numbers the code
281 /// is permitted to require.
282 FPDenormal::DenormalMode FPDenormalMode = FPDenormal::IEEE;
283
284 /// What exception model to use
285 ExceptionHandling ExceptionModel = ExceptionHandling::None;
286
287 /// Machine level options.
288 MCTargetOptions MCOptions;
289 };
290
291} // End llvm namespace
292
293#endif
294

Warning: That file was not part of the compilation database. It may have many parsing errors.