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//===- lib/MC/MCWasmStreamer.cpp - Wasm Object Output ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file assembles .s files and emits Wasm .o object files.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCWasmStreamer.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionWasm.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolWasm.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
MCWasmStreamer::~MCWasmStreamer() {}
void MCWasmStreamer::mergeFragment(MCDataFragment *DF, MCDataFragment *EF) {
flushPendingLabels(DF, DF->getContents().size());
for (unsigned i = 0, e = EF->getFixups().size(); i != e; ++i) {
EF->getFixups()[i].setOffset(EF->getFixups()[i].getOffset() +
DF->getContents().size());
DF->getFixups().push_back(EF->getFixups()[i]);
}
DF->setHasInstructions(true);
DF->getContents().append(EF->getContents().begin(), EF->getContents().end());
}
void MCWasmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
// Let the target do whatever target specific stuff it needs to do.
getAssembler().getBackend().handleAssemblerFlag(Flag);
// Do any generic stuff we need to do.
llvm_unreachable("invalid assembler flag!");
}
void MCWasmStreamer::ChangeSection(MCSection *Section,
const MCExpr *Subsection) {
MCAssembler &Asm = getAssembler();
auto *SectionWasm = static_cast<const MCSectionWasm *>(Section);
const MCSymbol *Grp = SectionWasm->getGroup();
if (Grp)
Asm.registerSymbol(*Grp);
this->MCObjectStreamer::ChangeSection(Section, Subsection);
}
void MCWasmStreamer::EmitWeakReference(MCSymbol *Alias,
const MCSymbol *Symbol) {
getAssembler().registerSymbol(*Symbol);
const MCExpr *Value = MCSymbolRefExpr::create(
Symbol, MCSymbolRefExpr::VK_WEAKREF, getContext());
Alias->setVariableValue(Value);
}
bool MCWasmStreamer::EmitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
assert(Attribute != MCSA_IndirectSymbol && "indirect symbols not supported");
auto *Symbol = cast<MCSymbolWasm>(S);
// Adding a symbol attribute always introduces the symbol, note that an
// important side effect of calling registerSymbol here is to register
// the symbol with the assembler.
getAssembler().registerSymbol(*Symbol);
// TODO: Set the symbol binding, type, etc.
return true;
}
void MCWasmStreamer::EmitCommonSymbol(MCSymbol *S, uint64_t Size,
unsigned ByteAlignment) {
llvm_unreachable("Common symbols are not yet implemented for Wasm");
}
void MCWasmStreamer::EmitLocalCommonSymbol(MCSymbol *S, uint64_t Size,
unsigned ByteAlignment) {
llvm_unreachable("Local common symbols are not yet implemented for Wasm");
}
void MCWasmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
SMLoc Loc) {
MCObjectStreamer::EmitValueImpl(Value, Size, Loc);
}
void MCWasmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) {
MCObjectStreamer::EmitValueToAlignment(ByteAlignment, Value, ValueSize,
MaxBytesToEmit);
}
// Add a symbol for the file name of this module. They start after the
// null symbol and don't count as normal symbol, i.e. a non-STT_FILE symbol
// with the same name may appear.
void MCWasmStreamer::EmitFileDirective(StringRef Filename) {
getAssembler().addFileName(Filename);
}
void MCWasmStreamer::EmitIdent(StringRef IdentString) {
llvm_unreachable("Ident sections not yet implemented for wasm");
}
void MCWasmStreamer::EmitInstToFragment(const MCInst &Inst,
const MCSubtargetInfo &STI) {
this->MCObjectStreamer::EmitInstToFragment(Inst, STI);
}
void MCWasmStreamer::EmitInstToData(const MCInst &Inst,
const MCSubtargetInfo &STI) {
MCAssembler &Assembler = getAssembler();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
// Append the encoded instruction to the current data fragment (or create a
// new such fragment if the current fragment is not a data fragment).
MCDataFragment *DF = getOrCreateDataFragment();
// Add the fixups and data.
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
DF->getFixups().push_back(Fixups[i]);
}
DF->setHasInstructions(true);
DF->getContents().append(Code.begin(), Code.end());
}
void MCWasmStreamer::FinishImpl() {
EmitFrames(nullptr);
this->MCObjectStreamer::FinishImpl();
}
MCStreamer *llvm::createWasmStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_pwrite_stream &OS, MCCodeEmitter *CE,
bool RelaxAll) {
MCWasmStreamer *S = new MCWasmStreamer(Context, MAB, OS, CE);
if (RelaxAll)
S->getAssembler().setRelaxAll(true);
return S;
}
void MCWasmStreamer::EmitThumbFunc(MCSymbol *Func) {
llvm_unreachable("Generic Wasm doesn't support this directive");
}
void MCWasmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
llvm_unreachable("Wasm doesn't support this directive");
}
void MCWasmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
llvm_unreachable("Wasm doesn't support this directive");
}
void MCWasmStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
llvm_unreachable("Wasm doesn't support this directive");
}
void MCWasmStreamer::EmitCOFFSymbolType(int Type) {
llvm_unreachable("Wasm doesn't support this directive");
}
void MCWasmStreamer::EndCOFFSymbolDef() {
llvm_unreachable("Wasm doesn't support this directive");
}
void MCWasmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment) {
llvm_unreachable("Wasm doesn't support this directive");
}
void MCWasmStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment) {
llvm_unreachable("Wasm doesn't support this directive");
}
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