WebAssemblyTargetStreamer.cpp revision 360784 
1//==-- WebAssemblyTargetStreamer.cpp - WebAssembly Target Streamer Methods --=//
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 defines WebAssembly-specific target streamer classes.
11/// These are for implementing support for target-specific assembly directives.
12///
13//===----------------------------------------------------------------------===//
14
15#include "MCTargetDesc/WebAssemblyTargetStreamer.h"
16#include "MCTargetDesc/WebAssemblyInstPrinter.h"
17#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
18#include "llvm/MC/MCContext.h"
19#include "llvm/MC/MCSectionWasm.h"
20#include "llvm/MC/MCSubtargetInfo.h"
21#include "llvm/MC/MCSymbolWasm.h"
22#include "llvm/Support/Casting.h"
23#include "llvm/Support/ErrorHandling.h"
24#include "llvm/Support/FormattedStream.h"
25using namespace llvm;
26
27WebAssemblyTargetStreamer::WebAssemblyTargetStreamer(MCStreamer &S)
28    : MCTargetStreamer(S) {}
29
30void WebAssemblyTargetStreamer::emitValueType(wasm::ValType Type) {
31  Streamer.EmitIntValue(uint8_t(Type), 1);
32}
33
34WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
35    MCStreamer &S, formatted_raw_ostream &OS)
36    : WebAssemblyTargetStreamer(S), OS(OS) {}
37
38WebAssemblyTargetWasmStreamer::WebAssemblyTargetWasmStreamer(MCStreamer &S)
39    : WebAssemblyTargetStreamer(S) {}
40
41static void printTypes(formatted_raw_ostream &OS,
42                       ArrayRef<wasm::ValType> Types) {
43  bool First = true;
44  for (auto Type : Types) {
45    if (First)
46      First = false;
47    else
48      OS << ", ";
49    OS << WebAssembly::typeToString(Type);
50  }
51  OS << '\n';
52}
53
54void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) {
55  if (!Types.empty()) {
56    OS << "\t.local  \t";
57    printTypes(OS, Types);
58  }
59}
60
61void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; }
62
63void WebAssemblyTargetAsmStreamer::emitFunctionType(const MCSymbolWasm *Sym) {
64  assert(Sym->isFunction());
65  OS << "\t.functype\t" << Sym->getName() << " ";
66  OS << WebAssembly::signatureToString(Sym->getSignature());
67  OS << "\n";
68}
69
70void WebAssemblyTargetAsmStreamer::emitGlobalType(const MCSymbolWasm *Sym) {
71  assert(Sym->isGlobal());
72  OS << "\t.globaltype\t" << Sym->getName() << ", "
73     << WebAssembly::typeToString(
74            static_cast<wasm::ValType>(Sym->getGlobalType().Type))
75     << '\n';
76}
77
78void WebAssemblyTargetAsmStreamer::emitEventType(const MCSymbolWasm *Sym) {
79  assert(Sym->isEvent());
80  OS << "\t.eventtype\t" << Sym->getName() << " ";
81  OS << WebAssembly::typeListToString(Sym->getSignature()->Params);
82  OS << "\n";
83}
84
85void WebAssemblyTargetAsmStreamer::emitImportModule(const MCSymbolWasm *Sym,
86                                                    StringRef ImportModule) {
87  OS << "\t.import_module\t" << Sym->getName() << ", "
88                             << ImportModule << '\n';
89}
90
91void WebAssemblyTargetAsmStreamer::emitImportName(const MCSymbolWasm *Sym,
92                                                  StringRef ImportName) {
93  OS << "\t.import_name\t" << Sym->getName() << ", "
94                           << ImportName << '\n';
95}
96
97void WebAssemblyTargetAsmStreamer::emitExportName(const MCSymbolWasm *Sym,
98                                                  StringRef ExportName) {
99  OS << "\t.export_name\t" << Sym->getName() << ", "
100                           << ExportName << '\n';
101}
102
103void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) {
104  OS << "\t.indidx  \t" << *Value << '\n';
105}
106
107void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) {
108  SmallVector<std::pair<wasm::ValType, uint32_t>, 4> Grouped;
109  for (auto Type : Types) {
110    if (Grouped.empty() || Grouped.back().first != Type)
111      Grouped.push_back(std::make_pair(Type, 1));
112    else
113      ++Grouped.back().second;
114  }
115
116  Streamer.EmitULEB128IntValue(Grouped.size());
117  for (auto Pair : Grouped) {
118    Streamer.EmitULEB128IntValue(Pair.second);
119    emitValueType(Pair.first);
120  }
121}
122
123void WebAssemblyTargetWasmStreamer::emitEndFunc() {
124  llvm_unreachable(".end_func is not needed for direct wasm output");
125}
126
127void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) {
128  llvm_unreachable(".indidx encoding not yet implemented");
129}
130