llvm/llvm/lib/CodeGen/AsmPrinter/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/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
usingnamespacellvm;

void WasmException::endModule() { … }

void WasmException::endFunction(const MachineFunction *MF) { … }

// 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,
    SmallVectorImpl<CallSiteRange> &CallSiteRanges,
    const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
    const SmallVectorImpl<unsigned> &FirstActions) { … }