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📄 ARMException.cpp(4.45 KB)
📄 AccelTable.cpp(24.07 KB)
📄 AddressPool.cpp(2.61 KB)
📄 AddressPool.h(1.93 KB)
📄 AsmPrinter.cpp(123.3 KB)
📄 AsmPrinterDwarf.cpp(9.88 KB)
📄 AsmPrinterInlineAsm.cpp(25.75 KB)
📄 ByteStreamer.h(3.93 KB)
📄 CodeViewDebug.cpp(115.03 KB)
📄 CodeViewDebug.h(17.9 KB)
📄 DIE.cpp(25.69 KB)
📄 DIEHash.cpp(14.17 KB)
📄 DIEHash.h(3.37 KB)
📄 DIEHashAttributes.def(2.02 KB)
📄 DbgEntityHistoryCalculator.cpp(14.88 KB)
📄 DebugHandlerBase.cpp(10.8 KB)
📄 DebugLocEntry.h(6.96 KB)
📄 DebugLocStream.cpp(1.36 KB)
📄 DebugLocStream.h(5.78 KB)
📄 DwarfCFIException.cpp(6.1 KB)
📄 DwarfCompileUnit.cpp(55.27 KB)
📄 DwarfCompileUnit.h(13.61 KB)
📄 DwarfDebug.cpp(128.56 KB)
📄 DwarfDebug.h(27.39 KB)
📄 DwarfException.h(3.23 KB)
📄 DwarfExpression.cpp(21.36 KB)
📄 DwarfExpression.h(15.03 KB)
📄 DwarfFile.cpp(4.31 KB)
📄 DwarfFile.h(5.86 KB)
📄 DwarfStringPool.cpp(4.72 KB)
📄 DwarfStringPool.h(2.07 KB)
📄 DwarfUnit.cpp(64.61 KB)
📄 DwarfUnit.h(14.34 KB)
📄 EHStreamer.cpp(25.33 KB)
📄 EHStreamer.h(5.66 KB)
📄 ErlangGCPrinter.cpp(4.16 KB)
📄 OcamlGCPrinter.cpp(6.38 KB)
📄 WasmException.cpp(4.09 KB)
📄 WasmException.h(1.32 KB)
📄 WinCFGuard.cpp(3.62 KB)
📄 WinCFGuard.h(1.77 KB)
📄 WinException.cpp(50.88 KB)
📄 WinException.h(4.1 KB)

Editing: WasmException.cpp

//===-- CodeGen/AsmPrinter/WasmException.cpp - Wasm Exception Impl --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing WebAssembly exception info into asm
// files.
//
//===----------------------------------------------------------------------===//

#include "WasmException.h"
#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
using namespace llvm;

void WasmException::endModule() {
  // This is the symbol used in 'throw' and 'br_on_exn' instruction to denote
  // this is a C++ exception. This symbol has to be emitted somewhere once in
  // the module.  Check if the symbol has already been created, i.e., we have at
  // least one 'throw' or 'br_on_exn' instruction in the module, and emit the
  // symbol only if so.
  SmallString<60> NameStr;
  Mangler::getNameWithPrefix(NameStr, "__cpp_exception", Asm->getDataLayout());
  if (Asm->OutContext.lookupSymbol(NameStr)) {
    MCSymbol *ExceptionSym = Asm->GetExternalSymbolSymbol("__cpp_exception");
    Asm->OutStreamer->emitLabel(ExceptionSym);
  }
}

void WasmException::markFunctionEnd() {
  // Get rid of any dead landing pads.
  if (!Asm->MF->getLandingPads().empty()) {
    auto *NonConstMF = const_cast<MachineFunction *>(Asm->MF);
    // Wasm does not set BeginLabel and EndLabel information for landing pads,
    // so we should set the second argument false.
    NonConstMF->tidyLandingPads(nullptr, /* TidyIfNoBeginLabels */ false);
  }
}

void WasmException::endFunction(const MachineFunction *MF) {
  bool ShouldEmitExceptionTable = false;
  for (const LandingPadInfo &Info : MF->getLandingPads()) {
    if (MF->hasWasmLandingPadIndex(Info.LandingPadBlock)) {
      ShouldEmitExceptionTable = true;
      break;
    }
  }
  if (!ShouldEmitExceptionTable)
    return;
  MCSymbol *LSDALabel = emitExceptionTable();
  assert(LSDALabel && ".GCC_exception_table has not been emitted!");

// Wasm requires every data section symbol to have a .size set. So we emit an
  // end marker and set the size as the difference between the start end the end
  // marker.
  MCSymbol *LSDAEndLabel = Asm->createTempSymbol("GCC_except_table_end");
  Asm->OutStreamer->emitLabel(LSDAEndLabel);
  MCContext &OutContext = Asm->OutStreamer->getContext();
  const MCExpr *SizeExp = MCBinaryExpr::createSub(
      MCSymbolRefExpr::create(LSDAEndLabel, OutContext),
      MCSymbolRefExpr::create(LSDALabel, OutContext), OutContext);
  Asm->OutStreamer->emitELFSize(LSDALabel, SizeExp);
}

// Compute the call-site table for wasm EH. Even though we use the same function
// name to share the common routines, a call site entry in the table corresponds
// to not a call site for possibly-throwing functions but a landing pad. In wasm
// EH the VM is responsible for stack unwinding. After an exception occurs and
// the stack is unwound, the control flow is transferred to wasm 'catch'
// instruction by the VM, after which the personality function is called from
// the compiler-generated code. Refer to WasmEHPrepare pass for more
// information.
void WasmException::computeCallSiteTable(
    SmallVectorImpl<CallSiteEntry> &CallSites,
    const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
    const SmallVectorImpl<unsigned> &FirstActions) {
  MachineFunction &MF = *Asm->MF;
  for (unsigned I = 0, N = LandingPads.size(); I < N; ++I) {
    const LandingPadInfo *Info = LandingPads[I];
    MachineBasicBlock *LPad = Info->LandingPadBlock;
    // We don't emit LSDA for single catch (...).
    if (!MF.hasWasmLandingPadIndex(LPad))
      continue;
    // Wasm EH must maintain the EH pads in the order assigned to them by the
    // WasmEHPrepare pass.
    unsigned LPadIndex = MF.getWasmLandingPadIndex(LPad);
    CallSiteEntry Site = {nullptr, nullptr, Info, FirstActions[I]};
    if (CallSites.size() < LPadIndex + 1)
      CallSites.resize(LPadIndex + 1);
    CallSites[LPadIndex] = Site;
  }
}

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Editing: WasmException.cpp

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