1 //===-- MCTargetOptionsCommandFlags.cpp -----------------------*- C++ //-*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains machine code-specific flags that are shared between
10 // different command line tools.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
15 #include "llvm/MC/MCTargetOptions.h"
16 #include "llvm/Support/CommandLine.h"
17 
18 using namespace llvm;
19 
20 #define MCOPT(TY, NAME)                                                        \
21   static cl::opt<TY> *NAME##View;                                              \
22   TY llvm::mc::get##NAME() {                                                   \
23     assert(NAME##View && "RegisterMCTargetOptionsFlags not created.");         \
24     return *NAME##View;                                                        \
25   }
26 
27 #define MCOPT_EXP(TY, NAME)                                                    \
28   MCOPT(TY, NAME)                                                              \
29   Optional<TY> llvm::mc::getExplicit##NAME() {                                 \
30     if (NAME##View->getNumOccurrences()) {                                     \
31       TY res = *NAME##View;                                                    \
32       return res;                                                              \
33     }                                                                          \
34     return None;                                                               \
35   }
36 
37 MCOPT_EXP(bool, RelaxAll)
38 MCOPT(bool, IncrementalLinkerCompatible)
39 MCOPT(int, DwarfVersion)
40 MCOPT(bool, Dwarf64)
41 MCOPT(EmitDwarfUnwindType, EmitDwarfUnwind)
42 MCOPT(bool, ShowMCInst)
43 MCOPT(bool, FatalWarnings)
44 MCOPT(bool, NoWarn)
45 MCOPT(bool, NoDeprecatedWarn)
46 MCOPT(bool, NoTypeCheck)
47 MCOPT(std::string, ABIName)
48 
49 llvm::mc::RegisterMCTargetOptionsFlags::RegisterMCTargetOptionsFlags() {
50 #define MCBINDOPT(NAME)                                                        \
51   do {                                                                         \
52     NAME##View = std::addressof(NAME);                                         \
53   } while (0)
54 
55   static cl::opt<bool> RelaxAll(
56       "mc-relax-all", cl::desc("When used with filetype=obj, relax all fixups "
57                                "in the emitted object file"));
58   MCBINDOPT(RelaxAll);
59 
60   static cl::opt<bool> IncrementalLinkerCompatible(
61       "incremental-linker-compatible",
62       cl::desc(
63           "When used with filetype=obj, "
64           "emit an object file which can be used with an incremental linker"));
65   MCBINDOPT(IncrementalLinkerCompatible);
66 
67   static cl::opt<int> DwarfVersion("dwarf-version", cl::desc("Dwarf version"),
68                                    cl::init(0));
69   MCBINDOPT(DwarfVersion);
70 
71   static cl::opt<bool> Dwarf64(
72       "dwarf64",
73       cl::desc("Generate debugging info in the 64-bit DWARF format"));
74   MCBINDOPT(Dwarf64);
75 
76   static cl::opt<EmitDwarfUnwindType> EmitDwarfUnwind(
77       "emit-dwarf-unwind", cl::desc("Whether to emit DWARF EH frame entries."),
78       cl::init(EmitDwarfUnwindType::Default),
79       cl::values(clEnumValN(EmitDwarfUnwindType::Always, "always",
80                             "Always emit EH frame entries"),
81                  clEnumValN(EmitDwarfUnwindType::NoCompactUnwind,
82                             "no-compact-unwind",
83                             "Only emit EH frame entries when compact unwind is "
84                             "not available"),
85                  clEnumValN(EmitDwarfUnwindType::Default, "default",
86                             "Use target platform default")));
87   MCBINDOPT(EmitDwarfUnwind);
88 
89   static cl::opt<bool> ShowMCInst(
90       "asm-show-inst",
91       cl::desc("Emit internal instruction representation to assembly file"));
92   MCBINDOPT(ShowMCInst);
93 
94   static cl::opt<bool> FatalWarnings("fatal-warnings",
95                                      cl::desc("Treat warnings as errors"));
96   MCBINDOPT(FatalWarnings);
97 
98   static cl::opt<bool> NoWarn("no-warn", cl::desc("Suppress all warnings"));
99   static cl::alias NoWarnW("W", cl::desc("Alias for --no-warn"),
100                            cl::aliasopt(NoWarn));
101   MCBINDOPT(NoWarn);
102 
103   static cl::opt<bool> NoDeprecatedWarn(
104       "no-deprecated-warn", cl::desc("Suppress all deprecated warnings"));
105   MCBINDOPT(NoDeprecatedWarn);
106 
107   static cl::opt<bool> NoTypeCheck(
108       "no-type-check", cl::desc("Suppress type errors (Wasm)"));
109   MCBINDOPT(NoTypeCheck);
110 
111   static cl::opt<std::string> ABIName(
112       "target-abi", cl::Hidden,
113       cl::desc("The name of the ABI to be targeted from the backend."),
114       cl::init(""));
115   MCBINDOPT(ABIName);
116 
117 #undef MCBINDOPT
118 }
119 
120 MCTargetOptions llvm::mc::InitMCTargetOptionsFromFlags() {
121   MCTargetOptions Options;
122   Options.MCRelaxAll = getRelaxAll();
123   Options.MCIncrementalLinkerCompatible = getIncrementalLinkerCompatible();
124   Options.Dwarf64 = getDwarf64();
125   Options.DwarfVersion = getDwarfVersion();
126   Options.ShowMCInst = getShowMCInst();
127   Options.ABIName = getABIName();
128   Options.MCFatalWarnings = getFatalWarnings();
129   Options.MCNoWarn = getNoWarn();
130   Options.MCNoDeprecatedWarn = getNoDeprecatedWarn();
131   Options.MCNoTypeCheck = getNoTypeCheck();
132   Options.EmitDwarfUnwind = getEmitDwarfUnwind();
133 
134   return Options;
135 }
136