1 //==-- WebAssemblyTargetStreamer.cpp - WebAssembly Target Streamer Methods --=//
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 /// \file
11 /// This file defines WebAssembly-specific target streamer classes.
12 /// These are for implementing support for target-specific assembly directives.
13 ///
14 //===----------------------------------------------------------------------===//
15 
16 #include "WebAssemblyTargetStreamer.h"
17 #include "InstPrinter/WebAssemblyInstPrinter.h"
18 #include "WebAssemblyMCTargetDesc.h"
19 #include "llvm/MC/MCContext.h"
20 #include "llvm/MC/MCSectionWasm.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/MCSymbolWasm.h"
23 #include "llvm/Support/Casting.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/FormattedStream.h"
26 using namespace llvm;
27 
28 WebAssemblyTargetStreamer::WebAssemblyTargetStreamer(MCStreamer &S)
29     : MCTargetStreamer(S) {}
30 
31 void WebAssemblyTargetStreamer::emitValueType(wasm::ValType Type) {
32   Streamer.EmitIntValue(uint8_t(Type), 1);
33 }
34 
35 WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
36     MCStreamer &S, formatted_raw_ostream &OS)
37     : WebAssemblyTargetStreamer(S), OS(OS) {}
38 
39 WebAssemblyTargetWasmStreamer::WebAssemblyTargetWasmStreamer(MCStreamer &S)
40     : WebAssemblyTargetStreamer(S) {}
41 
42 static void printTypes(formatted_raw_ostream &OS,
43                        ArrayRef<wasm::ValType> Types) {
44   bool First = true;
45   for (auto Type : Types) {
46     if (First)
47       First = false;
48     else
49       OS << ", ";
50     OS << WebAssembly::typeToString(Type);
51   }
52   OS << '\n';
53 }
54 
55 void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) {
56   if (!Types.empty()) {
57     OS << "\t.local  \t";
58     printTypes(OS, Types);
59   }
60 }
61 
62 void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; }
63 
64 void WebAssemblyTargetAsmStreamer::emitSignature(
65     const wasm::WasmSignature *Sig) {
66   OS << "(";
67   emitParamList(Sig);
68   OS << ") -> (";
69   emitReturnList(Sig);
70   OS << ")";
71 }
72 
73 void WebAssemblyTargetAsmStreamer::emitParamList(
74     const wasm::WasmSignature *Sig) {
75   auto &Params = Sig->Params;
76   for (auto &Ty : Params) {
77     if (&Ty != &Params[0])
78       OS << ", ";
79     OS << WebAssembly::typeToString(Ty);
80   }
81 }
82 
83 void WebAssemblyTargetAsmStreamer::emitReturnList(
84     const wasm::WasmSignature *Sig) {
85   auto &Returns = Sig->Returns;
86   for (auto &Ty : Returns) {
87     if (&Ty != &Returns[0])
88       OS << ", ";
89     OS << WebAssembly::typeToString(Ty);
90   }
91 }
92 
93 void WebAssemblyTargetAsmStreamer::emitFunctionType(const MCSymbolWasm *Sym) {
94   assert(Sym->isFunction());
95   OS << "\t.functype\t" << Sym->getName() << " ";
96   emitSignature(Sym->getSignature());
97   OS << "\n";
98 }
99 
100 void WebAssemblyTargetAsmStreamer::emitGlobalType(const MCSymbolWasm *Sym) {
101   assert(Sym->isGlobal());
102   OS << "\t.globaltype\t" << Sym->getName() << ", "
103      << WebAssembly::typeToString(
104             static_cast<wasm::ValType>(Sym->getGlobalType().Type))
105      << '\n';
106 }
107 
108 void WebAssemblyTargetAsmStreamer::emitEventType(const MCSymbolWasm *Sym) {
109   assert(Sym->isEvent());
110   OS << "\t.eventtype\t" << Sym->getName() << " ";
111   emitParamList(Sym->getSignature());
112   OS << "\n";
113 }
114 
115 void WebAssemblyTargetAsmStreamer::emitImportModule(const MCSymbolWasm *Sym,
116                                                     StringRef ModuleName) {
117   OS << "\t.import_module\t" << Sym->getName() << ", " << ModuleName << '\n';
118 }
119 
120 void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) {
121   OS << "\t.indidx  \t" << *Value << '\n';
122 }
123 
124 void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) {
125   SmallVector<std::pair<wasm::ValType, uint32_t>, 4> Grouped;
126   for (auto Type : Types) {
127     if (Grouped.empty() || Grouped.back().first != Type)
128       Grouped.push_back(std::make_pair(Type, 1));
129     else
130       ++Grouped.back().second;
131   }
132 
133   Streamer.EmitULEB128IntValue(Grouped.size());
134   for (auto Pair : Grouped) {
135     Streamer.EmitULEB128IntValue(Pair.second);
136     emitValueType(Pair.first);
137   }
138 }
139 
140 void WebAssemblyTargetWasmStreamer::emitEndFunc() {
141   llvm_unreachable(".end_func is not needed for direct wasm output");
142 }
143 
144 void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) {
145   llvm_unreachable(".indidx encoding not yet implemented");
146 }
147