Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyTargetStreamer.cpp

@@ -0,0 +1,264 @@
+//==-- WebAssemblyTargetStreamer.cpp - WebAssembly Target Streamer Methods --=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file defines WebAssembly-specific target streamer classes.
+/// These are for implementing support for target-specific assembly directives.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblyTargetStreamer.h"
+#include "InstPrinter/WebAssemblyInstPrinter.h"
+#include "WebAssemblyMCTargetDesc.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSectionWasm.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbolELF.h"
+#include "llvm/MC/MCSymbolWasm.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+WebAssemblyTargetStreamer::WebAssemblyTargetStreamer(MCStreamer &S)
+    : MCTargetStreamer(S) {}
+
+void WebAssemblyTargetStreamer::emitValueType(wasm::ValType Type) {
+  Streamer.EmitSLEB128IntValue(int32_t(Type));
+}
+
+WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
+    MCStreamer &S, formatted_raw_ostream &OS)
+    : WebAssemblyTargetStreamer(S), OS(OS) {}
+
+WebAssemblyTargetELFStreamer::WebAssemblyTargetELFStreamer(MCStreamer &S)
+    : WebAssemblyTargetStreamer(S) {}
+
+WebAssemblyTargetWasmStreamer::WebAssemblyTargetWasmStreamer(MCStreamer &S)
+    : WebAssemblyTargetStreamer(S) {}
+
+static void PrintTypes(formatted_raw_ostream &OS, ArrayRef<MVT> Types) {
+  bool First = true;
+  for (MVT Type : Types) {
+    if (First)
+      First = false;
+    else
+      OS << ", ";
+    OS << WebAssembly::TypeToString(Type);
+  }
+  OS << '\n';
+}
+
+void WebAssemblyTargetAsmStreamer::emitParam(MCSymbol *Symbol,
+                                             ArrayRef<MVT> Types) {
+  if (!Types.empty()) {
+    OS << "\t.param  \t";
+
+    // FIXME: Currently this applies to the "current" function; it may
+    // be cleaner to specify an explicit symbol as part of the directive.
+
+    PrintTypes(OS, Types);
+  }
+}
+
+void WebAssemblyTargetAsmStreamer::emitResult(MCSymbol *Symbol,
+                                              ArrayRef<MVT> Types) {
+  if (!Types.empty()) {
+    OS << "\t.result \t";
+
+    // FIXME: Currently this applies to the "current" function; it may
+    // be cleaner to specify an explicit symbol as part of the directive.
+
+    PrintTypes(OS, Types);
+  }
+}
+
+void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<MVT> Types) {
+  if (!Types.empty()) {
+    OS << "\t.local  \t";
+    PrintTypes(OS, Types);
+  }
+}
+
+void WebAssemblyTargetAsmStreamer::emitGlobal(
+    ArrayRef<wasm::Global> Globals) {
+  if (!Globals.empty()) {
+    OS << "\t.globalvar  \t";
+
+    bool First = true;
+    for (const wasm::Global &G : Globals) {
+      if (First)
+        First = false;
+      else
+        OS << ", ";
+      OS << WebAssembly::TypeToString(G.Type);
+      if (!G.InitialModule.empty())
+        OS << '=' << G.InitialModule << ':' << G.InitialName;
+      else
+        OS << '=' << G.InitialValue;
+    }
+    OS << '\n';
+  }
+}
+
+void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; }
+
+void WebAssemblyTargetAsmStreamer::emitIndirectFunctionType(
+    MCSymbol *Symbol, SmallVectorImpl<MVT> &Params, SmallVectorImpl<MVT> &Results) {
+  OS << "\t.functype\t" << Symbol->getName();
+  if (Results.empty())
+    OS << ", void";
+  else {
+    assert(Results.size() == 1);
+    OS << ", " << WebAssembly::TypeToString(Results.front());
+  }
+  for (auto Ty : Params)
+    OS << ", " << WebAssembly::TypeToString(Ty);
+  OS << '\n';
+}
+
+void WebAssemblyTargetAsmStreamer::emitGlobalImport(StringRef name) {
+  OS << "\t.import_global\t" << name << '\n';
+}
+
+void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) {
+  OS << "\t.indidx  \t" << *Value << '\n';
+}
+
+void WebAssemblyTargetELFStreamer::emitParam(MCSymbol *Symbol,
+                                             ArrayRef<MVT> Types) {
+  // Nothing to emit; params are declared as part of the function signature.
+}
+
+void WebAssemblyTargetELFStreamer::emitResult(MCSymbol *Symbol,
+                                              ArrayRef<MVT> Types) {
+  // Nothing to emit; results are declared as part of the function signature.
+}
+
+void WebAssemblyTargetELFStreamer::emitLocal(ArrayRef<MVT> Types) {
+  Streamer.EmitULEB128IntValue(Types.size());
+  for (MVT Type : Types)
+    emitValueType(WebAssembly::toValType(Type));
+}
+
+void WebAssemblyTargetELFStreamer::emitGlobal(
+    ArrayRef<wasm::Global> Globals) {
+  llvm_unreachable(".globalvar encoding not yet implemented");
+}
+
+void WebAssemblyTargetELFStreamer::emitEndFunc() {
+  Streamer.EmitIntValue(WebAssembly::End, 1);
+}
+
+void WebAssemblyTargetELFStreamer::emitIndIdx(const MCExpr *Value) {
+  llvm_unreachable(".indidx encoding not yet implemented");
+}
+
+void WebAssemblyTargetELFStreamer::emitIndirectFunctionType(
+    MCSymbol *Symbol, SmallVectorImpl<MVT> &Params, SmallVectorImpl<MVT> &Results) {
+  // Nothing to emit here. TODO: Re-design how linking works and re-evaluate
+  // whether it's necessary for .o files to declare indirect function types.
+}
+
+void WebAssemblyTargetELFStreamer::emitGlobalImport(StringRef name) {
+}
+
+void WebAssemblyTargetWasmStreamer::emitParam(MCSymbol *Symbol,
+                                              ArrayRef<MVT> Types) {
+  SmallVector<wasm::ValType, 4> Params;
+  for (MVT Ty : Types)
+    Params.push_back(WebAssembly::toValType(Ty));
+
+  cast<MCSymbolWasm>(Symbol)->setParams(std::move(Params));
+}
+
+void WebAssemblyTargetWasmStreamer::emitResult(MCSymbol *Symbol,
+                                               ArrayRef<MVT> Types) {
+  SmallVector<wasm::ValType, 4> Returns;
+  for (MVT Ty : Types)
+    Returns.push_back(WebAssembly::toValType(Ty));
+
+  cast<MCSymbolWasm>(Symbol)->setReturns(std::move(Returns));
+}
+
+void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<MVT> Types) {
+  SmallVector<std::pair<MVT, uint32_t>, 4> Grouped;
+  for (MVT Type : Types) {
+    if (Grouped.empty() || Grouped.back().first != Type)
+      Grouped.push_back(std::make_pair(Type, 1));
+    else
+      ++Grouped.back().second;
+  }
+
+  Streamer.EmitULEB128IntValue(Grouped.size());
+  for (auto Pair : Grouped) {
+    Streamer.EmitULEB128IntValue(Pair.second);
+    emitValueType(WebAssembly::toValType(Pair.first));
+  }
+}
+
+void WebAssemblyTargetWasmStreamer::emitGlobal(
+    ArrayRef<wasm::Global> Globals) {
+  // Encode the globals use by the funciton into the special .global_variables
+  // section. This will later be decoded and turned into contents for the
+  // Globals Section.
+  Streamer.PushSection();
+  Streamer.SwitchSection(Streamer.getContext().getWasmSection(
+      ".global_variables", SectionKind::getMetadata()));
+  for (const wasm::Global &G : Globals) {
+    Streamer.EmitIntValue(int32_t(G.Type), 1);
+    Streamer.EmitIntValue(G.Mutable, 1);
+    if (G.InitialModule.empty()) {
+      Streamer.EmitIntValue(0, 1); // indicate that we have an int value
+      Streamer.EmitSLEB128IntValue(0);
+    } else {
+      Streamer.EmitIntValue(1, 1); // indicate that we have a module import
+      Streamer.EmitBytes(G.InitialModule);
+      Streamer.EmitIntValue(0, 1); // nul-terminate
+      Streamer.EmitBytes(G.InitialName);
+      Streamer.EmitIntValue(0, 1); // nul-terminate
+    }
+  }
+  Streamer.PopSection();
+}
+
+void WebAssemblyTargetWasmStreamer::emitEndFunc() {
+  llvm_unreachable(".end_func is not needed for direct wasm output");
+}
+
+void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) {
+  llvm_unreachable(".indidx encoding not yet implemented");
+}
+
+void WebAssemblyTargetWasmStreamer::emitIndirectFunctionType(
+    MCSymbol *Symbol, SmallVectorImpl<MVT> &Params,
+    SmallVectorImpl<MVT> &Results) {
+  MCSymbolWasm *WasmSym = cast<MCSymbolWasm>(Symbol);
+  if (WasmSym->isFunction()) {
+    // Symbol already has its arguments and result set.
+    return;
+  }
+
+  SmallVector<wasm::ValType, 4> ValParams;
+  for (MVT Ty : Params)
+    ValParams.push_back(WebAssembly::toValType(Ty));
+
+  SmallVector<wasm::ValType, 1> ValResults;
+  for (MVT Ty : Results)
+    ValResults.push_back(WebAssembly::toValType(Ty));
+
+  WasmSym->setParams(std::move(ValParams));
+  WasmSym->setReturns(std::move(ValResults));
+  WasmSym->setIsFunction(true);
+}
+
+void WebAssemblyTargetWasmStreamer::emitGlobalImport(StringRef name) {
+  llvm_unreachable(".global_import is not needed for direct wasm output");
+}