Add 'const' to a few more functions in MachineFrameInfo
[oota-llvm.git] / include / llvm / CodeGen / CommandFlags.h
1 //===-- CommandFlags.h - Command Line Flags Interface -----------*- 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 contains codegen-specific flags that are shared between different
11 // command line tools. The tools "llc" and "opt" both use this file to prevent
12 // flag duplication.
13 //
14 //===----------------------------------------------------------------------===//
15
16 #ifndef LLVM_CODEGEN_COMMANDFLAGS_H
17 #define LLVM_CODEGEN_COMMANDFLAGS_H
18
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/IR/Instructions.h"
21 #include "llvm/IR/Intrinsics.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
24 #include "llvm//MC/SubtargetFeature.h"
25 #include "llvm/Support/CodeGen.h"
26 #include "llvm/Support/CommandLine.h"
27 #include "llvm/Support/Host.h"
28 #include "llvm/Target/TargetMachine.h"
29 #include "llvm/Target/TargetOptions.h"
30 #include "llvm/Target/TargetRecip.h"
31 #include <string>
32 using namespace llvm;
33
34 cl::opt<std::string>
35 MArch("march", cl::desc("Architecture to generate code for (see --version)"));
36
37 cl::opt<std::string>
38 MCPU("mcpu",
39      cl::desc("Target a specific cpu type (-mcpu=help for details)"),
40      cl::value_desc("cpu-name"),
41      cl::init(""));
42
43 cl::list<std::string>
44 MAttrs("mattr",
45        cl::CommaSeparated,
46        cl::desc("Target specific attributes (-mattr=help for details)"),
47        cl::value_desc("a1,+a2,-a3,..."));
48
49 cl::opt<Reloc::Model>
50 RelocModel("relocation-model",
51            cl::desc("Choose relocation model"),
52            cl::init(Reloc::Default),
53            cl::values(
54               clEnumValN(Reloc::Default, "default",
55                       "Target default relocation model"),
56               clEnumValN(Reloc::Static, "static",
57                       "Non-relocatable code"),
58               clEnumValN(Reloc::PIC_, "pic",
59                       "Fully relocatable, position independent code"),
60               clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
61                       "Relocatable external references, non-relocatable code"),
62               clEnumValEnd));
63
64 cl::opt<ThreadModel::Model>
65 TMModel("thread-model",
66         cl::desc("Choose threading model"),
67         cl::init(ThreadModel::POSIX),
68         cl::values(clEnumValN(ThreadModel::POSIX, "posix",
69                               "POSIX thread model"),
70                    clEnumValN(ThreadModel::Single, "single",
71                               "Single thread model"),
72                    clEnumValEnd));
73
74 cl::opt<llvm::CodeModel::Model>
75 CMModel("code-model",
76         cl::desc("Choose code model"),
77         cl::init(CodeModel::Default),
78         cl::values(clEnumValN(CodeModel::Default, "default",
79                               "Target default code model"),
80                    clEnumValN(CodeModel::Small, "small",
81                               "Small code model"),
82                    clEnumValN(CodeModel::Kernel, "kernel",
83                               "Kernel code model"),
84                    clEnumValN(CodeModel::Medium, "medium",
85                               "Medium code model"),
86                    clEnumValN(CodeModel::Large, "large",
87                               "Large code model"),
88                    clEnumValEnd));
89
90 cl::opt<TargetMachine::CodeGenFileType>
91 FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
92   cl::desc("Choose a file type (not all types are supported by all targets):"),
93   cl::values(
94              clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm",
95                         "Emit an assembly ('.s') file"),
96              clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
97                         "Emit a native object ('.o') file"),
98              clEnumValN(TargetMachine::CGFT_Null, "null",
99                         "Emit nothing, for performance testing"),
100              clEnumValEnd));
101
102 cl::opt<bool>
103 EnableFPMAD("enable-fp-mad",
104             cl::desc("Enable less precise MAD instructions to be generated"),
105             cl::init(false));
106
107 cl::opt<bool>
108 DisableFPElim("disable-fp-elim",
109               cl::desc("Disable frame pointer elimination optimization"),
110               cl::init(false));
111
112 cl::opt<bool>
113 EnableUnsafeFPMath("enable-unsafe-fp-math",
114                 cl::desc("Enable optimizations that may decrease FP precision"),
115                 cl::init(false));
116
117 cl::opt<bool>
118 EnableNoInfsFPMath("enable-no-infs-fp-math",
119                 cl::desc("Enable FP math optimizations that assume no +-Infs"),
120                 cl::init(false));
121
122 cl::opt<bool>
123 EnableNoNaNsFPMath("enable-no-nans-fp-math",
124                    cl::desc("Enable FP math optimizations that assume no NaNs"),
125                    cl::init(false));
126
127 cl::opt<bool>
128 EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
129       cl::Hidden,
130       cl::desc("Force codegen to assume rounding mode can change dynamically"),
131       cl::init(false));
132
133 cl::opt<llvm::FloatABI::ABIType>
134 FloatABIForCalls("float-abi",
135                  cl::desc("Choose float ABI type"),
136                  cl::init(FloatABI::Default),
137                  cl::values(
138                      clEnumValN(FloatABI::Default, "default",
139                                 "Target default float ABI type"),
140                      clEnumValN(FloatABI::Soft, "soft",
141                                 "Soft float ABI (implied by -soft-float)"),
142                      clEnumValN(FloatABI::Hard, "hard",
143                                 "Hard float ABI (uses FP registers)"),
144                      clEnumValEnd));
145
146 cl::opt<llvm::FPOpFusion::FPOpFusionMode>
147 FuseFPOps("fp-contract",
148           cl::desc("Enable aggressive formation of fused FP ops"),
149           cl::init(FPOpFusion::Standard),
150           cl::values(
151               clEnumValN(FPOpFusion::Fast, "fast",
152                          "Fuse FP ops whenever profitable"),
153               clEnumValN(FPOpFusion::Standard, "on",
154                          "Only fuse 'blessed' FP ops."),
155               clEnumValN(FPOpFusion::Strict, "off",
156                          "Only fuse FP ops when the result won't be affected."),
157               clEnumValEnd));
158
159 cl::list<std::string>
160 ReciprocalOps("recip",
161   cl::CommaSeparated,
162   cl::desc("Choose reciprocal operation types and parameters."),
163   cl::value_desc("all,none,default,divf,!vec-sqrtd,vec-divd:0,sqrt:9..."));
164
165 cl::opt<bool>
166 DontPlaceZerosInBSS("nozero-initialized-in-bss",
167               cl::desc("Don't place zero-initialized symbols into bss section"),
168               cl::init(false));
169
170 cl::opt<bool>
171 EnableGuaranteedTailCallOpt("tailcallopt",
172   cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
173   cl::init(false));
174
175 cl::opt<bool>
176 DisableTailCalls("disable-tail-calls",
177                  cl::desc("Never emit tail calls"),
178                  cl::init(false));
179
180 cl::opt<unsigned>
181 OverrideStackAlignment("stack-alignment",
182                        cl::desc("Override default stack alignment"),
183                        cl::init(0));
184
185 cl::opt<std::string>
186 TrapFuncName("trap-func", cl::Hidden,
187         cl::desc("Emit a call to trap function rather than a trap instruction"),
188         cl::init(""));
189
190 cl::opt<bool>
191 EnablePIE("enable-pie",
192           cl::desc("Assume the creation of a position independent executable."),
193           cl::init(false));
194
195 cl::opt<bool>
196 UseCtors("use-ctors",
197              cl::desc("Use .ctors instead of .init_array."),
198              cl::init(false));
199
200 cl::opt<std::string> StopAfter("stop-after",
201                             cl::desc("Stop compilation after a specific pass"),
202                             cl::value_desc("pass-name"),
203                                       cl::init(""));
204 cl::opt<std::string> StartAfter("start-after",
205                           cl::desc("Resume compilation after a specific pass"),
206                           cl::value_desc("pass-name"),
207                           cl::init(""));
208
209 cl::opt<std::string>
210     RunPass("run-pass", cl::desc("Run compiler only for one specific pass"),
211             cl::value_desc("pass-name"), cl::init(""));
212
213 cl::opt<bool> DataSections("data-sections",
214                            cl::desc("Emit data into separate sections"),
215                            cl::init(false));
216
217 cl::opt<bool>
218 FunctionSections("function-sections",
219                  cl::desc("Emit functions into separate sections"),
220                  cl::init(false));
221
222 cl::opt<bool> UniqueSectionNames("unique-section-names",
223                                  cl::desc("Give unique names to every section"),
224                                  cl::init(true));
225
226 cl::opt<llvm::JumpTable::JumpTableType>
227 JTableType("jump-table-type",
228           cl::desc("Choose the type of Jump-Instruction Table for jumptable."),
229           cl::init(JumpTable::Single),
230           cl::values(
231               clEnumValN(JumpTable::Single, "single",
232                          "Create a single table for all jumptable functions"),
233               clEnumValN(JumpTable::Arity, "arity",
234                          "Create one table per number of parameters."),
235               clEnumValN(JumpTable::Simplified, "simplified",
236                          "Create one table per simplified function type."),
237               clEnumValN(JumpTable::Full, "full",
238                          "Create one table per unique function type."),
239               clEnumValEnd));
240
241 // Common utility function tightly tied to the options listed here. Initializes
242 // a TargetOptions object with CodeGen flags and returns it.
243 static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
244   TargetOptions Options;
245   Options.LessPreciseFPMADOption = EnableFPMAD;
246   Options.AllowFPOpFusion = FuseFPOps;
247   Options.Reciprocals = TargetRecip(ReciprocalOps);
248   Options.UnsafeFPMath = EnableUnsafeFPMath;
249   Options.NoInfsFPMath = EnableNoInfsFPMath;
250   Options.NoNaNsFPMath = EnableNoNaNsFPMath;
251   Options.HonorSignDependentRoundingFPMathOption =
252       EnableHonorSignDependentRoundingFPMath;
253   if (FloatABIForCalls != FloatABI::Default)
254     Options.FloatABIType = FloatABIForCalls;
255   Options.NoZerosInBSS = DontPlaceZerosInBSS;
256   Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
257   Options.StackAlignmentOverride = OverrideStackAlignment;
258   Options.PositionIndependentExecutable = EnablePIE;
259   Options.UseInitArray = !UseCtors;
260   Options.DataSections = DataSections;
261   Options.FunctionSections = FunctionSections;
262   Options.UniqueSectionNames = UniqueSectionNames;
263
264   Options.MCOptions = InitMCTargetOptionsFromFlags();
265   Options.JTType = JTableType;
266
267   Options.ThreadModel = TMModel;
268
269   return Options;
270 }
271
272 static inline std::string getCPUStr() {
273   // If user asked for the 'native' CPU, autodetect here. If autodection fails,
274   // this will set the CPU to an empty string which tells the target to
275   // pick a basic default.
276   if (MCPU == "native")
277     return sys::getHostCPUName();
278
279   return MCPU;
280 }
281
282 static inline std::string getFeaturesStr() {
283   SubtargetFeatures Features;
284
285   // If user asked for the 'native' CPU, we need to autodetect features.
286   // This is necessary for x86 where the CPU might not support all the
287   // features the autodetected CPU name lists in the target. For example,
288   // not all Sandybridge processors support AVX.
289   if (MCPU == "native") {
290     StringMap<bool> HostFeatures;
291     if (sys::getHostCPUFeatures(HostFeatures))
292       for (auto &F : HostFeatures)
293         Features.AddFeature(F.first(), F.second);
294   }
295
296   for (unsigned i = 0; i != MAttrs.size(); ++i)
297     Features.AddFeature(MAttrs[i]);
298
299   return Features.getString();
300 }
301
302 /// \brief Set function attributes of functions in Module M based on CPU,
303 /// Features, and command line flags.
304 static inline void setFunctionAttributes(StringRef CPU, StringRef Features,
305                                          Module &M) {
306   for (auto &F : M) {
307     auto &Ctx = F.getContext();
308     AttributeSet Attrs = F.getAttributes(), NewAttrs;
309
310     if (!CPU.empty())
311       NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
312                                        "target-cpu", CPU);
313
314     if (!Features.empty())
315       NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
316                                        "target-features", Features);
317
318     if (DisableFPElim.getNumOccurrences() > 0)
319       NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
320                                        "no-frame-pointer-elim",
321                                        DisableFPElim ? "true" : "false");
322
323     if (DisableTailCalls.getNumOccurrences() > 0)
324       NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
325                                        "disable-tail-calls",
326                                        toStringRef(DisableTailCalls));
327
328     if (TrapFuncName.getNumOccurrences() > 0)
329       for (auto &B : F)
330         for (auto &I : B)
331           if (auto *Call = dyn_cast<CallInst>(&I))
332             if (const auto *F = Call->getCalledFunction())
333               if (F->getIntrinsicID() == Intrinsic::debugtrap ||
334                   F->getIntrinsicID() == Intrinsic::trap)
335                 Call->addAttribute(llvm::AttributeSet::FunctionIndex,
336                                    "trap-func-name", TrapFuncName);
337
338     // Let NewAttrs override Attrs.
339     NewAttrs = Attrs.addAttributes(Ctx, AttributeSet::FunctionIndex, NewAttrs);
340     F.setAttributes(NewAttrs);
341   }
342 }
343
344 #endif