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//==-- 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
/// 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/MCSectionWasm.h"
#include "llvm/MC/MCSubtargetInfo.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.EmitIntValue(uint8_t(Type), 1);
}
WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer(
MCStreamer &S, formatted_raw_ostream &OS)
: WebAssemblyTargetStreamer(S), OS(OS) {}
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::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::emitImportModule(MCSymbolWasm *Sym,
StringRef ModuleName) {
OS << "\t.import_module\t" << Sym->getName() << ", " << ModuleName << '\n';
}
void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) {
OS << "\t.indidx \t" << *Value << '\n';
}
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::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->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
}
void WebAssemblyTargetWasmStreamer::emitGlobalImport(StringRef name) {
llvm_unreachable(".global_import is not needed for direct wasm output");
}
void WebAssemblyTargetWasmStreamer::emitImportModule(MCSymbolWasm *Sym,
StringRef ModuleName) {
Sym->setModuleName(ModuleName);
}
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