CIRGenException.cpp

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//===--- CIRGenException.cpp - Emit CIR Code for C++ exceptions -*- C++ -*-===//
//
// 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 contains code dealing with C++ exception related code generation.
//
//===----------------------------------------------------------------------===//
 
#include "CIRGenCXXABI.h"
#include "CIRGenFunction.h"
 
#include "clang/AST/StmtVisitor.h"
 
using namespace clang;
using namespace clang::CIRGen;
 
void CIRGenFunction::emitCXXThrowExpr(const CXXThrowExpr *e) {
  const llvm::Triple &triple = getTarget().getTriple();
  if (cgm.getLangOpts().OpenMPIsTargetDevice &&
      (triple.isNVPTX() || triple.isAMDGCN())) {
    cgm.errorNYI("emitCXXThrowExpr OpenMP with NVPTX or AMDGCN Triples");
    return;
  }
 
  if (const Expr *subExpr = e->getSubExpr()) {
    QualType throwType = subExpr->getType();
    if (throwType->isObjCObjectPointerType()) {
      cgm.errorNYI("emitCXXThrowExpr ObjCObjectPointerType");
      return;
    }
 
    cgm.getCXXABI().emitThrow(*this, e);
    return;
  }
 
  cgm.getCXXABI().emitRethrow(*this, /*isNoReturn=*/true);
}
 
void CIRGenFunction::emitAnyExprToExn(const Expr *e, Address addr) {
  // Make sure the exception object is cleaned up if there's an
  // exception during initialization.
  assert(!cir::MissingFeatures::ehCleanupScope());
 
  // __cxa_allocate_exception returns a void*;  we need to cast this
  // to the appropriate type for the object.
  mlir::Type ty = convertTypeForMem(e->getType());
  Address typedAddr = addr.withElementType(builder, ty);
 
  // From LLVM's codegen:
  // FIXME: this isn't quite right!  If there's a final unelided call
  // to a copy constructor, then according to [except.terminate]p1 we
  // must call std::terminate() if that constructor throws, because
  // technically that copy occurs after the exception expression is
  // evaluated but before the exception is caught.  But the best way
  // to handle that is to teach EmitAggExpr to do the final copy
  // differently if it can't be elided.
  emitAnyExprToMem(e, typedAddr, e->getType().getQualifiers(),
                   /*isInitializer=*/true);
 
  // Deactivate the cleanup block.
  assert(!cir::MissingFeatures::ehCleanupScope());
}
 
mlir::LogicalResult CIRGenFunction::emitCXXTryStmt(const CXXTryStmt &s) {
  if (s.getTryBlock()->body_empty())
    return mlir::LogicalResult::success();
 
  cgm.errorNYI("exitCXXTryStmt: CXXTryStmt with non-empty body");
  return mlir::LogicalResult::success();
}