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 /// \brief 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/MCSectionELF.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/MCSymbolELF.h"
23 #include "llvm/Support/ELF.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 WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
32     MCStreamer &S, formatted_raw_ostream &OS)
33     : WebAssemblyTargetStreamer(S), OS(OS) {}
34 
35 WebAssemblyTargetELFStreamer::WebAssemblyTargetELFStreamer(MCStreamer &S)
36     : WebAssemblyTargetStreamer(S) {}
37 
38 static void PrintTypes(formatted_raw_ostream &OS, ArrayRef<MVT> Types) {
39   bool First = true;
40   for (MVT Type : Types) {
41     if (First)
42       First = false;
43     else
44       OS << ", ";
45     OS << WebAssembly::TypeToString(Type);
46   }
47   OS << '\n';
48 }
49 
50 void WebAssemblyTargetAsmStreamer::emitParam(ArrayRef<MVT> Types) {
51   OS << "\t.param  \t";
52   PrintTypes(OS, Types);
53 }
54 
55 void WebAssemblyTargetAsmStreamer::emitResult(ArrayRef<MVT> Types) {
56   OS << "\t.result \t";
57   PrintTypes(OS, Types);
58 }
59 
60 void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<MVT> Types) {
61   if (!Types.empty()) {
62     OS << "\t.local  \t";
63     PrintTypes(OS, Types);
64   }
65 }
66 
67 void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; }
68 
69 void WebAssemblyTargetAsmStreamer::emitIndirectFunctionType(
70     StringRef name, SmallVectorImpl<MVT> &Params, SmallVectorImpl<MVT> &Results) {
71   OS << "\t.functype\t" << name;
72   if (Results.empty())
73     OS << ", void";
74   else {
75     assert(Results.size() == 1);
76     OS << ", " << WebAssembly::TypeToString(Results.front());
77   }
78   for (auto Ty : Params)
79     OS << ", " << WebAssembly::TypeToString(Ty);
80   OS << '\n';
81 }
82 
83 void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) {
84   OS << "\t.indidx  \t" << *Value << '\n';
85 }
86 
87 void WebAssemblyTargetELFStreamer::emitParam(ArrayRef<MVT> Types) {
88   // Nothing to emit; params are declared as part of the function signature.
89 }
90 
91 void WebAssemblyTargetELFStreamer::emitResult(ArrayRef<MVT> Types) {
92   // Nothing to emit; results are declared as part of the function signature.
93 }
94 
95 void WebAssemblyTargetELFStreamer::emitLocal(ArrayRef<MVT> Types) {
96   Streamer.EmitULEB128IntValue(Types.size());
97   for (MVT Type : Types)
98     Streamer.EmitIntValue(int64_t(WebAssembly::toValType(Type)), 1);
99 }
100 
101 void WebAssemblyTargetELFStreamer::emitEndFunc() {
102   Streamer.EmitIntValue(WebAssembly::End, 1);
103 }
104 
105 void WebAssemblyTargetELFStreamer::emitIndIdx(const MCExpr *Value) {
106   llvm_unreachable(".indidx encoding not yet implemented");
107 }
108 
109 void WebAssemblyTargetELFStreamer::emitIndirectFunctionType(
110     StringRef name, SmallVectorImpl<MVT> &Params, SmallVectorImpl<MVT> &Results) {
111   // Nothing to emit here. TODO: Re-design how linking works and re-evaluate
112   // whether it's necessary for .o files to declare indirect function types.
113 }
114