6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
//===--- Stack.h - Utilities for dealing with stack space -------*- C++ -*-===//
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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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/// \file
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/// Defines utilities for dealing with stack allocation and stack space.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_BASIC_STACK_H
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#define LLVM_CLANG_BASIC_STACK_H
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#include <cstddef>
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Compiler.h"
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namespace clang {
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/// The amount of stack space that Clang would like to be provided with.
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/// If less than this much is available, we may be unable to reach our
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/// template instantiation depth limit and other similar limits.
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constexpr size_t DesiredStackSize = 8 << 20;
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/// Call this once on each thread, as soon after starting the thread as
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/// feasible, to note the approximate address of the bottom of the stack.
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void noteBottomOfStack();
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/// Determine whether the stack is nearly exhausted.
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bool isStackNearlyExhausted();
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void runWithSufficientStackSpaceSlow(llvm::function_ref<void()> Diag,
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llvm::function_ref<void()> Fn);
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/// Run a given function on a stack with "sufficient" space. If stack space
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/// is insufficient, calls Diag to emit a diagnostic before calling Fn.
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inline void runWithSufficientStackSpace(llvm::function_ref<void()> Diag,
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llvm::function_ref<void()> Fn) {
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#if LLVM_ENABLE_THREADS
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if (LLVM_UNLIKELY(isStackNearlyExhausted()))
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runWithSufficientStackSpaceSlow(Diag, Fn);
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else
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Fn();
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#else
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if (LLVM_UNLIKELY(isStackNearlyExhausted()))
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Diag();
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Fn();
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#endif
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}
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} // end namespace clang
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#endif // LLVM_CLANG_BASIC_STACK_H
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