blob: be21ce9c4a18ca9f2982375951b1eaf1f62f9fb8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
//===--- 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();
}
}
|
