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TargetMachine.cpp (202878) TargetMachine.cpp (203954)
1//===-- TargetMachine.cpp - General Target Information ---------------------==//
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 describes the general parts of a Target machine.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/MC/MCAsmInfo.h"
15#include "llvm/Target/TargetMachine.h"
16#include "llvm/Target/TargetOptions.h"
17#include "llvm/Support/CommandLine.h"
18using namespace llvm;
19
20//---------------------------------------------------------------------------
21// Command-line options that tend to be useful on more than one back-end.
22//
23
24namespace llvm {
25 bool LessPreciseFPMADOption;
26 bool PrintMachineCode;
27 bool NoFramePointerElim;
28 bool NoExcessFPPrecision;
29 bool UnsafeFPMath;
30 bool FiniteOnlyFPMathOption;
31 bool HonorSignDependentRoundingFPMathOption;
32 bool UseSoftFloat;
33 FloatABI::ABIType FloatABIType;
34 bool NoImplicitFloat;
35 bool NoZerosInBSS;
36 bool DwarfExceptionHandling;
37 bool SjLjExceptionHandling;
38 bool JITEmitDebugInfo;
39 bool JITEmitDebugInfoToDisk;
40 bool UnwindTablesMandatory;
41 Reloc::Model RelocationModel;
42 CodeModel::Model CMModel;
1//===-- TargetMachine.cpp - General Target Information ---------------------==//
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 describes the general parts of a Target machine.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/MC/MCAsmInfo.h"
15#include "llvm/Target/TargetMachine.h"
16#include "llvm/Target/TargetOptions.h"
17#include "llvm/Support/CommandLine.h"
18using namespace llvm;
19
20//---------------------------------------------------------------------------
21// Command-line options that tend to be useful on more than one back-end.
22//
23
24namespace llvm {
25 bool LessPreciseFPMADOption;
26 bool PrintMachineCode;
27 bool NoFramePointerElim;
28 bool NoExcessFPPrecision;
29 bool UnsafeFPMath;
30 bool FiniteOnlyFPMathOption;
31 bool HonorSignDependentRoundingFPMathOption;
32 bool UseSoftFloat;
33 FloatABI::ABIType FloatABIType;
34 bool NoImplicitFloat;
35 bool NoZerosInBSS;
36 bool DwarfExceptionHandling;
37 bool SjLjExceptionHandling;
38 bool JITEmitDebugInfo;
39 bool JITEmitDebugInfoToDisk;
40 bool UnwindTablesMandatory;
41 Reloc::Model RelocationModel;
42 CodeModel::Model CMModel;
43 bool PerformTailCallOpt;
43 bool GuaranteedTailCallOpt;
44 unsigned StackAlignment;
45 bool RealignStack;
46 bool DisableJumpTables;
47 bool StrongPHIElim;
48 bool AsmVerbosityDefault(false);
49}
50
51static cl::opt<bool, true>
52PrintCode("print-machineinstrs",
53 cl::desc("Print generated machine code"),
54 cl::location(PrintMachineCode), cl::init(false));
55static cl::opt<bool, true>
56DisableFPElim("disable-fp-elim",
57 cl::desc("Disable frame pointer elimination optimization"),
58 cl::location(NoFramePointerElim),
59 cl::init(false));
60static cl::opt<bool, true>
61DisableExcessPrecision("disable-excess-fp-precision",
62 cl::desc("Disable optimizations that may increase FP precision"),
63 cl::location(NoExcessFPPrecision),
64 cl::init(false));
65static cl::opt<bool, true>
66EnableFPMAD("enable-fp-mad",
67 cl::desc("Enable less precise MAD instructions to be generated"),
68 cl::location(LessPreciseFPMADOption),
69 cl::init(false));
70static cl::opt<bool, true>
71EnableUnsafeFPMath("enable-unsafe-fp-math",
72 cl::desc("Enable optimizations that may decrease FP precision"),
73 cl::location(UnsafeFPMath),
74 cl::init(false));
75static cl::opt<bool, true>
76EnableFiniteOnlyFPMath("enable-finite-only-fp-math",
77 cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"),
78 cl::location(FiniteOnlyFPMathOption),
79 cl::init(false));
80static cl::opt<bool, true>
81EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
82 cl::Hidden,
83 cl::desc("Force codegen to assume rounding mode can change dynamically"),
84 cl::location(HonorSignDependentRoundingFPMathOption),
85 cl::init(false));
86static cl::opt<bool, true>
87GenerateSoftFloatCalls("soft-float",
88 cl::desc("Generate software floating point library calls"),
89 cl::location(UseSoftFloat),
90 cl::init(false));
91static cl::opt<llvm::FloatABI::ABIType, true>
92FloatABIForCalls("float-abi",
93 cl::desc("Choose float ABI type"),
94 cl::location(FloatABIType),
95 cl::init(FloatABI::Default),
96 cl::values(
97 clEnumValN(FloatABI::Default, "default",
98 "Target default float ABI type"),
99 clEnumValN(FloatABI::Soft, "soft",
100 "Soft float ABI (implied by -soft-float)"),
101 clEnumValN(FloatABI::Hard, "hard",
102 "Hard float ABI (uses FP registers)"),
103 clEnumValEnd));
104static cl::opt<bool, true>
105DontPlaceZerosInBSS("nozero-initialized-in-bss",
106 cl::desc("Don't place zero-initialized symbols into bss section"),
107 cl::location(NoZerosInBSS),
108 cl::init(false));
109static cl::opt<bool, true>
110EnableDwarfExceptionHandling("enable-eh",
111 cl::desc("Emit DWARF exception handling (default if target supports)"),
112 cl::location(DwarfExceptionHandling),
113 cl::init(false));
114static cl::opt<bool, true>
115EnableSjLjExceptionHandling("enable-sjlj-eh",
116 cl::desc("Emit SJLJ exception handling (default if target supports)"),
117 cl::location(SjLjExceptionHandling),
118 cl::init(false));
119// In debug builds, make this default to true.
120#ifdef NDEBUG
121#define EMIT_DEBUG false
122#else
123#define EMIT_DEBUG true
124#endif
125static cl::opt<bool, true>
126EmitJitDebugInfo("jit-emit-debug",
127 cl::desc("Emit debug information to debugger"),
128 cl::location(JITEmitDebugInfo),
129 cl::init(EMIT_DEBUG));
130#undef EMIT_DEBUG
131static cl::opt<bool, true>
132EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
133 cl::Hidden,
134 cl::desc("Emit debug info objfiles to disk"),
135 cl::location(JITEmitDebugInfoToDisk),
136 cl::init(false));
137static cl::opt<bool, true>
138EnableUnwindTables("unwind-tables",
139 cl::desc("Generate unwinding tables for all functions"),
140 cl::location(UnwindTablesMandatory),
141 cl::init(false));
142
143static cl::opt<llvm::Reloc::Model, true>
144DefRelocationModel("relocation-model",
145 cl::desc("Choose relocation model"),
146 cl::location(RelocationModel),
147 cl::init(Reloc::Default),
148 cl::values(
149 clEnumValN(Reloc::Default, "default",
150 "Target default relocation model"),
151 clEnumValN(Reloc::Static, "static",
152 "Non-relocatable code"),
153 clEnumValN(Reloc::PIC_, "pic",
154 "Fully relocatable, position independent code"),
155 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
156 "Relocatable external references, non-relocatable code"),
157 clEnumValEnd));
158static cl::opt<llvm::CodeModel::Model, true>
159DefCodeModel("code-model",
160 cl::desc("Choose code model"),
161 cl::location(CMModel),
162 cl::init(CodeModel::Default),
163 cl::values(
164 clEnumValN(CodeModel::Default, "default",
165 "Target default code model"),
166 clEnumValN(CodeModel::Small, "small",
167 "Small code model"),
168 clEnumValN(CodeModel::Kernel, "kernel",
169 "Kernel code model"),
170 clEnumValN(CodeModel::Medium, "medium",
171 "Medium code model"),
172 clEnumValN(CodeModel::Large, "large",
173 "Large code model"),
174 clEnumValEnd));
175static cl::opt<bool, true>
44 unsigned StackAlignment;
45 bool RealignStack;
46 bool DisableJumpTables;
47 bool StrongPHIElim;
48 bool AsmVerbosityDefault(false);
49}
50
51static cl::opt<bool, true>
52PrintCode("print-machineinstrs",
53 cl::desc("Print generated machine code"),
54 cl::location(PrintMachineCode), cl::init(false));
55static cl::opt<bool, true>
56DisableFPElim("disable-fp-elim",
57 cl::desc("Disable frame pointer elimination optimization"),
58 cl::location(NoFramePointerElim),
59 cl::init(false));
60static cl::opt<bool, true>
61DisableExcessPrecision("disable-excess-fp-precision",
62 cl::desc("Disable optimizations that may increase FP precision"),
63 cl::location(NoExcessFPPrecision),
64 cl::init(false));
65static cl::opt<bool, true>
66EnableFPMAD("enable-fp-mad",
67 cl::desc("Enable less precise MAD instructions to be generated"),
68 cl::location(LessPreciseFPMADOption),
69 cl::init(false));
70static cl::opt<bool, true>
71EnableUnsafeFPMath("enable-unsafe-fp-math",
72 cl::desc("Enable optimizations that may decrease FP precision"),
73 cl::location(UnsafeFPMath),
74 cl::init(false));
75static cl::opt<bool, true>
76EnableFiniteOnlyFPMath("enable-finite-only-fp-math",
77 cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"),
78 cl::location(FiniteOnlyFPMathOption),
79 cl::init(false));
80static cl::opt<bool, true>
81EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
82 cl::Hidden,
83 cl::desc("Force codegen to assume rounding mode can change dynamically"),
84 cl::location(HonorSignDependentRoundingFPMathOption),
85 cl::init(false));
86static cl::opt<bool, true>
87GenerateSoftFloatCalls("soft-float",
88 cl::desc("Generate software floating point library calls"),
89 cl::location(UseSoftFloat),
90 cl::init(false));
91static cl::opt<llvm::FloatABI::ABIType, true>
92FloatABIForCalls("float-abi",
93 cl::desc("Choose float ABI type"),
94 cl::location(FloatABIType),
95 cl::init(FloatABI::Default),
96 cl::values(
97 clEnumValN(FloatABI::Default, "default",
98 "Target default float ABI type"),
99 clEnumValN(FloatABI::Soft, "soft",
100 "Soft float ABI (implied by -soft-float)"),
101 clEnumValN(FloatABI::Hard, "hard",
102 "Hard float ABI (uses FP registers)"),
103 clEnumValEnd));
104static cl::opt<bool, true>
105DontPlaceZerosInBSS("nozero-initialized-in-bss",
106 cl::desc("Don't place zero-initialized symbols into bss section"),
107 cl::location(NoZerosInBSS),
108 cl::init(false));
109static cl::opt<bool, true>
110EnableDwarfExceptionHandling("enable-eh",
111 cl::desc("Emit DWARF exception handling (default if target supports)"),
112 cl::location(DwarfExceptionHandling),
113 cl::init(false));
114static cl::opt<bool, true>
115EnableSjLjExceptionHandling("enable-sjlj-eh",
116 cl::desc("Emit SJLJ exception handling (default if target supports)"),
117 cl::location(SjLjExceptionHandling),
118 cl::init(false));
119// In debug builds, make this default to true.
120#ifdef NDEBUG
121#define EMIT_DEBUG false
122#else
123#define EMIT_DEBUG true
124#endif
125static cl::opt<bool, true>
126EmitJitDebugInfo("jit-emit-debug",
127 cl::desc("Emit debug information to debugger"),
128 cl::location(JITEmitDebugInfo),
129 cl::init(EMIT_DEBUG));
130#undef EMIT_DEBUG
131static cl::opt<bool, true>
132EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
133 cl::Hidden,
134 cl::desc("Emit debug info objfiles to disk"),
135 cl::location(JITEmitDebugInfoToDisk),
136 cl::init(false));
137static cl::opt<bool, true>
138EnableUnwindTables("unwind-tables",
139 cl::desc("Generate unwinding tables for all functions"),
140 cl::location(UnwindTablesMandatory),
141 cl::init(false));
142
143static cl::opt<llvm::Reloc::Model, true>
144DefRelocationModel("relocation-model",
145 cl::desc("Choose relocation model"),
146 cl::location(RelocationModel),
147 cl::init(Reloc::Default),
148 cl::values(
149 clEnumValN(Reloc::Default, "default",
150 "Target default relocation model"),
151 clEnumValN(Reloc::Static, "static",
152 "Non-relocatable code"),
153 clEnumValN(Reloc::PIC_, "pic",
154 "Fully relocatable, position independent code"),
155 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
156 "Relocatable external references, non-relocatable code"),
157 clEnumValEnd));
158static cl::opt<llvm::CodeModel::Model, true>
159DefCodeModel("code-model",
160 cl::desc("Choose code model"),
161 cl::location(CMModel),
162 cl::init(CodeModel::Default),
163 cl::values(
164 clEnumValN(CodeModel::Default, "default",
165 "Target default code model"),
166 clEnumValN(CodeModel::Small, "small",
167 "Small code model"),
168 clEnumValN(CodeModel::Kernel, "kernel",
169 "Kernel code model"),
170 clEnumValN(CodeModel::Medium, "medium",
171 "Medium code model"),
172 clEnumValN(CodeModel::Large, "large",
173 "Large code model"),
174 clEnumValEnd));
175static cl::opt<bool, true>
176EnablePerformTailCallOpt("tailcallopt",
177 cl::desc("Turn on tail call optimization."),
178 cl::location(PerformTailCallOpt),
176EnableGuaranteedTailCallOpt("tailcallopt",
177 cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
178 cl::location(GuaranteedTailCallOpt),
179 cl::init(false));
180static cl::opt<unsigned, true>
181OverrideStackAlignment("stack-alignment",
182 cl::desc("Override default stack alignment"),
183 cl::location(StackAlignment),
184 cl::init(0));
185static cl::opt<bool, true>
186EnableRealignStack("realign-stack",
187 cl::desc("Realign stack if needed"),
188 cl::location(RealignStack),
189 cl::init(true));
190static cl::opt<bool, true>
191DisableSwitchTables(cl::Hidden, "disable-jump-tables",
192 cl::desc("Do not generate jump tables."),
193 cl::location(DisableJumpTables),
194 cl::init(false));
195static cl::opt<bool, true>
196EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
197 cl::desc("Use strong PHI elimination."),
198 cl::location(StrongPHIElim),
199 cl::init(false));
200
201//---------------------------------------------------------------------------
202// TargetMachine Class
203//
204
205TargetMachine::TargetMachine(const Target &T)
206 : TheTarget(T), AsmInfo(0) {
207 // Typically it will be subtargets that will adjust FloatABIType from Default
208 // to Soft or Hard.
209 if (UseSoftFloat)
210 FloatABIType = FloatABI::Soft;
211}
212
213TargetMachine::~TargetMachine() {
214 delete AsmInfo;
215}
216
217/// getRelocationModel - Returns the code generation relocation model. The
218/// choices are static, PIC, and dynamic-no-pic, and target default.
219Reloc::Model TargetMachine::getRelocationModel() {
220 return RelocationModel;
221}
222
223/// setRelocationModel - Sets the code generation relocation model.
224void TargetMachine::setRelocationModel(Reloc::Model Model) {
225 RelocationModel = Model;
226}
227
228/// getCodeModel - Returns the code model. The choices are small, kernel,
229/// medium, large, and target default.
230CodeModel::Model TargetMachine::getCodeModel() {
231 return CMModel;
232}
233
234/// setCodeModel - Sets the code model.
235void TargetMachine::setCodeModel(CodeModel::Model Model) {
236 CMModel = Model;
237}
238
239bool TargetMachine::getAsmVerbosityDefault() {
240 return AsmVerbosityDefault;
241}
242
243void TargetMachine::setAsmVerbosityDefault(bool V) {
244 AsmVerbosityDefault = V;
245}
246
247namespace llvm {
248 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
249 /// is specified on the command line. When this flag is off(default), the
250 /// code generator is not allowed to generate mad (multiply add) if the
251 /// result is "less precise" than doing those operations individually.
252 bool LessPreciseFPMAD() { return UnsafeFPMath || LessPreciseFPMADOption; }
253
254 /// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
255 /// option is specified on the command line. If this returns false (default),
256 /// the code generator is not allowed to assume that FP arithmetic arguments
257 /// and results are never NaNs or +-Infs.
258 bool FiniteOnlyFPMath() { return UnsafeFPMath || FiniteOnlyFPMathOption; }
259
260 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
261 /// that the rounding mode of the FPU can change from its default.
262 bool HonorSignDependentRoundingFPMath() {
263 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
264 }
265}
179 cl::init(false));
180static cl::opt<unsigned, true>
181OverrideStackAlignment("stack-alignment",
182 cl::desc("Override default stack alignment"),
183 cl::location(StackAlignment),
184 cl::init(0));
185static cl::opt<bool, true>
186EnableRealignStack("realign-stack",
187 cl::desc("Realign stack if needed"),
188 cl::location(RealignStack),
189 cl::init(true));
190static cl::opt<bool, true>
191DisableSwitchTables(cl::Hidden, "disable-jump-tables",
192 cl::desc("Do not generate jump tables."),
193 cl::location(DisableJumpTables),
194 cl::init(false));
195static cl::opt<bool, true>
196EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
197 cl::desc("Use strong PHI elimination."),
198 cl::location(StrongPHIElim),
199 cl::init(false));
200
201//---------------------------------------------------------------------------
202// TargetMachine Class
203//
204
205TargetMachine::TargetMachine(const Target &T)
206 : TheTarget(T), AsmInfo(0) {
207 // Typically it will be subtargets that will adjust FloatABIType from Default
208 // to Soft or Hard.
209 if (UseSoftFloat)
210 FloatABIType = FloatABI::Soft;
211}
212
213TargetMachine::~TargetMachine() {
214 delete AsmInfo;
215}
216
217/// getRelocationModel - Returns the code generation relocation model. The
218/// choices are static, PIC, and dynamic-no-pic, and target default.
219Reloc::Model TargetMachine::getRelocationModel() {
220 return RelocationModel;
221}
222
223/// setRelocationModel - Sets the code generation relocation model.
224void TargetMachine::setRelocationModel(Reloc::Model Model) {
225 RelocationModel = Model;
226}
227
228/// getCodeModel - Returns the code model. The choices are small, kernel,
229/// medium, large, and target default.
230CodeModel::Model TargetMachine::getCodeModel() {
231 return CMModel;
232}
233
234/// setCodeModel - Sets the code model.
235void TargetMachine::setCodeModel(CodeModel::Model Model) {
236 CMModel = Model;
237}
238
239bool TargetMachine::getAsmVerbosityDefault() {
240 return AsmVerbosityDefault;
241}
242
243void TargetMachine::setAsmVerbosityDefault(bool V) {
244 AsmVerbosityDefault = V;
245}
246
247namespace llvm {
248 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
249 /// is specified on the command line. When this flag is off(default), the
250 /// code generator is not allowed to generate mad (multiply add) if the
251 /// result is "less precise" than doing those operations individually.
252 bool LessPreciseFPMAD() { return UnsafeFPMath || LessPreciseFPMADOption; }
253
254 /// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
255 /// option is specified on the command line. If this returns false (default),
256 /// the code generator is not allowed to assume that FP arithmetic arguments
257 /// and results are never NaNs or +-Infs.
258 bool FiniteOnlyFPMath() { return UnsafeFPMath || FiniteOnlyFPMathOption; }
259
260 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
261 /// that the rounding mode of the FPU can change from its default.
262 bool HonorSignDependentRoundingFPMath() {
263 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
264 }
265}