xref: /freebsd/contrib/llvm-project/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp (revision dab59af3bcc7cb7ba01569d3044894b3e860ad56)
1 //===-- WebAssemblyMCTargetDesc.cpp - WebAssembly Target Descriptions -----===//
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 /// \file
10 /// This file provides WebAssembly-specific target descriptions.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
15 #include "MCTargetDesc/WebAssemblyInstPrinter.h"
16 #include "MCTargetDesc/WebAssemblyMCAsmInfo.h"
17 #include "MCTargetDesc/WebAssemblyTargetStreamer.h"
18 #include "TargetInfo/WebAssemblyTargetInfo.h"
19 #include "llvm/MC/MCInstrInfo.h"
20 #include "llvm/MC/MCRegisterInfo.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/TargetRegistry.h"
23 #include "llvm/Support/ErrorHandling.h"
24 using namespace llvm;
25 
26 #define DEBUG_TYPE "wasm-mc-target-desc"
27 
28 #define GET_INSTRINFO_MC_DESC
29 #define ENABLE_INSTR_PREDICATE_VERIFIER
30 #include "WebAssemblyGenInstrInfo.inc"
31 
32 #define GET_SUBTARGETINFO_MC_DESC
33 #include "WebAssemblyGenSubtargetInfo.inc"
34 
35 #define GET_REGINFO_MC_DESC
36 #include "WebAssemblyGenRegisterInfo.inc"
37 
38 // Exception handling & setjmp-longjmp handling related options.
39 
40 // Emscripten's asm.js-style exception handling
41 cl::opt<bool> WebAssembly::WasmEnableEmEH(
42     "enable-emscripten-cxx-exceptions",
43     cl::desc("WebAssembly Emscripten-style exception handling"),
44     cl::init(false));
45 // Emscripten's asm.js-style setjmp/longjmp handling
46 cl::opt<bool> WebAssembly::WasmEnableEmSjLj(
47     "enable-emscripten-sjlj",
48     cl::desc("WebAssembly Emscripten-style setjmp/longjmp handling"),
49     cl::init(false));
50 // Exception handling using wasm EH instructions
51 cl::opt<bool>
52     WebAssembly::WasmEnableEH("wasm-enable-eh",
53                               cl::desc("WebAssembly exception handling"));
54 // setjmp/longjmp handling using wasm EH instrutions
55 cl::opt<bool> WebAssembly::WasmEnableSjLj(
56     "wasm-enable-sjlj", cl::desc("WebAssembly setjmp/longjmp handling"));
57 // Whether we use the new exnref Wasm EH proposal adopted on Oct 2023.
58 // Should be used with -wasm-enable-eh.
59 // Currently set to false by default, but will later change to true and then
60 // later can be removed after the legacy WAsm EH instructions are removed.
61 cl::opt<bool> WebAssembly::WasmEnableExnref(
62     "wasm-enable-exnref", cl::desc("WebAssembly exception handling (exnref)"),
63     cl::init(false));
64 
65 static MCAsmInfo *createMCAsmInfo(const MCRegisterInfo & /*MRI*/,
66                                   const Triple &TT,
67                                   const MCTargetOptions &Options) {
68   return new WebAssemblyMCAsmInfo(TT, Options);
69 }
70 
71 static MCInstrInfo *createMCInstrInfo() {
72   auto *X = new MCInstrInfo();
73   InitWebAssemblyMCInstrInfo(X);
74   return X;
75 }
76 
77 static MCRegisterInfo *createMCRegisterInfo(const Triple & /*T*/) {
78   auto *X = new MCRegisterInfo();
79   InitWebAssemblyMCRegisterInfo(X, 0);
80   return X;
81 }
82 
83 static MCInstPrinter *createMCInstPrinter(const Triple & /*T*/,
84                                           unsigned SyntaxVariant,
85                                           const MCAsmInfo &MAI,
86                                           const MCInstrInfo &MII,
87                                           const MCRegisterInfo &MRI) {
88   assert(SyntaxVariant == 0 && "WebAssembly only has one syntax variant");
89   return new WebAssemblyInstPrinter(MAI, MII, MRI);
90 }
91 
92 static MCCodeEmitter *createCodeEmitter(const MCInstrInfo &MCII,
93                                         MCContext &Ctx) {
94   return createWebAssemblyMCCodeEmitter(MCII, Ctx);
95 }
96 
97 static MCAsmBackend *createAsmBackend(const Target & /*T*/,
98                                       const MCSubtargetInfo &STI,
99                                       const MCRegisterInfo & /*MRI*/,
100                                       const MCTargetOptions & /*Options*/) {
101   return createWebAssemblyAsmBackend(STI.getTargetTriple());
102 }
103 
104 static MCSubtargetInfo *createMCSubtargetInfo(const Triple &TT, StringRef CPU,
105                                               StringRef FS) {
106   return createWebAssemblyMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, FS);
107 }
108 
109 static MCTargetStreamer *
110 createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
111   return new WebAssemblyTargetWasmStreamer(S);
112 }
113 
114 static MCTargetStreamer *
115 createAsmTargetStreamer(MCStreamer &S, formatted_raw_ostream &OS,
116                         MCInstPrinter * /*InstPrint*/) {
117   return new WebAssemblyTargetAsmStreamer(S, OS);
118 }
119 
120 static MCTargetStreamer *createNullTargetStreamer(MCStreamer &S) {
121   return new WebAssemblyTargetNullStreamer(S);
122 }
123 
124 // Force static initialization.
125 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyTargetMC() {
126   for (Target *T :
127        {&getTheWebAssemblyTarget32(), &getTheWebAssemblyTarget64()}) {
128     // Register the MC asm info.
129     RegisterMCAsmInfoFn X(*T, createMCAsmInfo);
130 
131     // Register the MC instruction info.
132     TargetRegistry::RegisterMCInstrInfo(*T, createMCInstrInfo);
133 
134     // Register the MC register info.
135     TargetRegistry::RegisterMCRegInfo(*T, createMCRegisterInfo);
136 
137     // Register the MCInstPrinter.
138     TargetRegistry::RegisterMCInstPrinter(*T, createMCInstPrinter);
139 
140     // Register the MC code emitter.
141     TargetRegistry::RegisterMCCodeEmitter(*T, createCodeEmitter);
142 
143     // Register the ASM Backend.
144     TargetRegistry::RegisterMCAsmBackend(*T, createAsmBackend);
145 
146     // Register the MC subtarget info.
147     TargetRegistry::RegisterMCSubtargetInfo(*T, createMCSubtargetInfo);
148 
149     // Register the object target streamer.
150     TargetRegistry::RegisterObjectTargetStreamer(*T,
151                                                  createObjectTargetStreamer);
152     // Register the asm target streamer.
153     TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer);
154     // Register the null target streamer.
155     TargetRegistry::RegisterNullTargetStreamer(*T, createNullTargetStreamer);
156   }
157 }
158