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-rw-r--r--clang/lib/CIR/CodeGen/CIRGenCleanup.cpp69
1 files changed, 69 insertions, 0 deletions
diff --git a/clang/lib/CIR/CodeGen/CIRGenCleanup.cpp b/clang/lib/CIR/CodeGen/CIRGenCleanup.cpp
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+//===--- CIRGenCleanup.cpp - Bookkeeping and code emission for cleanups ---===//
+//
+// 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 code dealing with the IR generation for cleanups
+// and related information.
+//
+// A "cleanup" is a piece of code which needs to be executed whenever
+// control transfers out of a particular scope. This can be
+// conditionalized to occur only on exceptional control flow, only on
+// normal control flow, or both.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CIRGenFunction.h"
+
+#include "clang/CIR/MissingFeatures.h"
+
+using namespace clang;
+using namespace clang::CIRGen;
+
+//===----------------------------------------------------------------------===//
+// CIRGenFunction cleanup related
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// EHScopeStack
+//===----------------------------------------------------------------------===//
+
+void EHScopeStack::Cleanup::anchor() {}
+
+static mlir::Block *getCurCleanupBlock(CIRGenFunction &cgf) {
+ mlir::OpBuilder::InsertionGuard guard(cgf.getBuilder());
+ mlir::Block *cleanup =
+ cgf.curLexScope->getOrCreateCleanupBlock(cgf.getBuilder());
+ return cleanup;
+}
+
+/// Pops a cleanup block. If the block includes a normal cleanup, the
+/// current insertion point is threaded through the cleanup, as are
+/// any branch fixups on the cleanup.
+void CIRGenFunction::popCleanupBlock() {
+ assert(!ehStack.cleanupStack.empty() && "cleanup stack is empty!");
+ mlir::OpBuilder::InsertionGuard guard(builder);
+ std::unique_ptr<EHScopeStack::Cleanup> cleanup =
+ ehStack.cleanupStack.pop_back_val();
+
+ assert(!cir::MissingFeatures::ehCleanupFlags());
+ mlir::Block *cleanupEntry = getCurCleanupBlock(*this);
+ builder.setInsertionPointToEnd(cleanupEntry);
+ cleanup->emit(*this);
+}
+
+/// Pops cleanup blocks until the given savepoint is reached.
+void CIRGenFunction::popCleanupBlocks(size_t oldCleanupStackDepth) {
+ assert(!cir::MissingFeatures::ehstackBranches());
+
+ assert(ehStack.getStackDepth() >= oldCleanupStackDepth);
+
+ // Pop cleanup blocks until we reach the base stack depth for the
+ // current scope.
+ while (ehStack.getStackDepth() > oldCleanupStackDepth) {
+ popCleanupBlock();
+ }
+}