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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
38538ff97f
Adds stack space handling similar to Clang's approach, but with more support for forwarding return values. Refactors ParseAndExecute for better sharing, and for centralization of the InitStackSpace handling. Fixes #2795
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "explorer/interpreter/stack_space.h"
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#include "common/check.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/CrashRecoveryContext.h"
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namespace Carbon::Internal {
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static constexpr int64_t SufficientStack = 256 << 10;
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static constexpr int64_t DesiredStackSpace = 8 << 20;
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static LLVM_THREAD_LOCAL intptr_t bottom_of_stack = 0;
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// Returns the current bottom of stack.
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static auto GetStackPointer() -> intptr_t {
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char char_on_stack = 0;
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char* volatile ptr = &char_on_stack;
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return reinterpret_cast<intptr_t>(ptr);
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}
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auto IsStackSpaceNearlyExhausted() -> bool {
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if (bottom_of_stack == 0) {
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// Not initialized on the thread; always start a new thread.
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return true;
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}
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return std::abs(GetStackPointer() - bottom_of_stack) >
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(DesiredStackSpace - SufficientStack);
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}
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auto RunWithExtraStackHelper(llvm::function_ref<void()> fn) -> void {
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llvm::CrashRecoveryContext context;
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context.RunSafelyOnThread(
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[&] {
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bottom_of_stack = GetStackPointer();
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fn();
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},
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DesiredStackSpace);
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}
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} // namespace Carbon::Internal
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