47b5917348
This change adds basic handling for normal cleanups. This is a very minimal implemention. In particular, it uses a naive substitute for the rich cleanup and EH stack handling that is present in classic codegen and the CIR incubator. This is intended as a temporary implementation to allow incremental progress. It is not expected to scale well enough to be used in a production environment. It will be replaced with the full EHScopeStack handling when such an implementation is needed.
70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
//===--- CIRGenCleanup.cpp - Bookkeeping and code emission for cleanups ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code dealing with the IR generation for cleanups
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// and related information.
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//
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// A "cleanup" is a piece of code which needs to be executed whenever
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// control transfers out of a particular scope. This can be
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// conditionalized to occur only on exceptional control flow, only on
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// normal control flow, or both.
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//
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//===----------------------------------------------------------------------===//
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#include "CIRGenFunction.h"
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#include "clang/CIR/MissingFeatures.h"
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using namespace clang;
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using namespace clang::CIRGen;
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//===----------------------------------------------------------------------===//
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// CIRGenFunction cleanup related
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// EHScopeStack
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//===----------------------------------------------------------------------===//
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void EHScopeStack::Cleanup::anchor() {}
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static mlir::Block *getCurCleanupBlock(CIRGenFunction &cgf) {
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mlir::OpBuilder::InsertionGuard guard(cgf.getBuilder());
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mlir::Block *cleanup =
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cgf.curLexScope->getOrCreateCleanupBlock(cgf.getBuilder());
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return cleanup;
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}
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/// Pops a cleanup block. If the block includes a normal cleanup, the
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/// current insertion point is threaded through the cleanup, as are
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/// any branch fixups on the cleanup.
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void CIRGenFunction::popCleanupBlock() {
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assert(!ehStack.cleanupStack.empty() && "cleanup stack is empty!");
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mlir::OpBuilder::InsertionGuard guard(builder);
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std::unique_ptr<EHScopeStack::Cleanup> cleanup =
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ehStack.cleanupStack.pop_back_val();
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assert(!cir::MissingFeatures::ehCleanupFlags());
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mlir::Block *cleanupEntry = getCurCleanupBlock(*this);
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builder.setInsertionPointToEnd(cleanupEntry);
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cleanup->emit(*this);
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}
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/// Pops cleanup blocks until the given savepoint is reached.
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void CIRGenFunction::popCleanupBlocks(size_t oldCleanupStackDepth) {
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assert(!cir::MissingFeatures::ehstackBranches());
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assert(ehStack.getStackDepth() >= oldCleanupStackDepth);
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// Pop cleanup blocks until we reach the base stack depth for the
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// current scope.
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while (ehStack.getStackDepth() > oldCleanupStackDepth) {
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popCleanupBlock();
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}
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}
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