227d8d33c6
This was potentially causing Clang to emit out of stack space warnings in rare cases, so I'm reverting it until I can verify the issue. This keeps the API change as that's known not to be the issue.
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
//===--- ProgramStack.h -----------------------------------------*- 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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#ifndef LLVM_SUPPORT_PROGRAMSTACK_H
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#define LLVM_SUPPORT_PROGRAMSTACK_H
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#include "llvm/ADT/STLFunctionalExtras.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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/// \returns an address close to the current value of the stack pointer.
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///
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/// The value is not guaranteed to point to anything specific. It can be used to
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/// estimate how much stack space has been used since the previous call.
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LLVM_ABI uintptr_t getStackPointer();
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/// \returns the default stack size for this platform.
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///
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/// Based on \p RLIMIT_STACK or the equivalent.
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LLVM_ABI unsigned getDefaultStackSize();
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/// Runs Fn on a new stack of at least the given size.
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///
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/// \param StackSize requested stack size. A size of 0 uses the default stack
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/// size of the platform.
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///
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/// The preferred implementation is split stacks on platforms that have a good
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/// debugging experience for them. On other platforms a new thread is used.
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LLVM_ABI void runOnNewStack(unsigned StackSize, function_ref<void()> Fn);
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template <typename R, typename... Ts>
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auto runOnNewStack(unsigned StackSize, function_ref<R(Ts...)> Fn,
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Ts &&...Args) {
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if constexpr (std::is_same_v<R, void>) {
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runOnNewStack(StackSize, [&]() { Fn(std::forward<Ts>(Args)...); });
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} else {
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std::optional<R> Ret;
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runOnNewStack(StackSize, [&]() { Ret = Fn(std::forward<Ts>(Args)...); });
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return std::move(*Ret);
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}
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}
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} // namespace llvm
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#endif // LLVM_SUPPORT_PROGRAMSTACK_H
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