lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.cpp

   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"
  25 using namespace llvm;
  26
  27 WebAssemblyTargetStreamer::WebAssemblyTargetStreamer(MCStreamer &S)
  28     : MCTargetStreamer(S) {}
  29
  30 void WebAssemblyTargetStreamer::emitValueType(wasm::ValType Type) {
  31   Streamer.EmitIntValue(uint8_t(Type), 1);
  32 }
  33
  34 WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
  35     MCStreamer &S, formatted_raw_ostream &OS)
  36     : WebAssemblyTargetStreamer(S), OS(OS) {}
  37
  38 WebAssemblyTargetWasmStreamer::WebAssemblyTargetWasmStreamer(MCStreamer &S)
  39     : WebAssemblyTargetStreamer(S) {}
  40
  41 static 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
  54 void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) {
  55   if (!Types.empty()) {
  56     OS << "\t.local  \t";
  57     printTypes(OS, Types);
  58   }
  59 }
  60
  61 void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; }
  62
  63 void 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
  70 void 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
  78 void 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
  85 void WebAssemblyTargetAsmStreamer::emitImportModule(const MCSymbolWasm *Sym,
  86                                                     StringRef ImportModule) {
  87   OS << "\t.import_module\t" << Sym->getName() << ", "
  88                              << ImportModule << '\n';
  89 }
  90
  91 void WebAssemblyTargetAsmStreamer::emitImportName(const MCSymbolWasm *Sym,
  92                                                   StringRef ImportName) {
  93   OS << "\t.import_name\t" << Sym->getName() << ", "
  94                            << ImportName << '\n';
  95 }
  96
  97 void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) {
  98   OS << "\t.indidx  \t" << *Value << '\n';
  99 }
 100
 101 void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) {
 102   SmallVector<std::pair<wasm::ValType, uint32_t>, 4> Grouped;
 103   for (auto Type : Types) {
 104     if (Grouped.empty() || Grouped.back().first != Type)
 105       Grouped.push_back(std::make_pair(Type, 1));
 106     else
 107       ++Grouped.back().second;
 108   }
 109
 110   Streamer.EmitULEB128IntValue(Grouped.size());
 111   for (auto Pair : Grouped) {
 112     Streamer.EmitULEB128IntValue(Pair.second);
 113     emitValueType(Pair.first);
 114   }
 115 }
 116
 117 void WebAssemblyTargetWasmStreamer::emitEndFunc() {
 118   llvm_unreachable(".end_func is not needed for direct wasm output");
 119 }
 120
 121 void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) {
 122   llvm_unreachable(".indidx encoding not yet implemented");
 123 }