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