================ @@ -0,0 +1,115 @@ +//===--- RunOnNewStack.cpp - Crash Recovery -------------------------------===// +// +// 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 +// +//===----------------------------------------------------------------------===// + +#include "llvm/Support/ProgramStack.h" +#include "llvm/Config/config.h" +#include "llvm/Support/Compiler.h" + +#ifdef HAVE_SYS_RESOURCE_H +# include <sys/resource.h> +#endif + +#ifdef _MSC_VER +# include <intrin.h> // for _AddressOfReturnAddress +#endif + +// Currently only Apple AArch64 is known to support split stacks in the debugger +// and other tooling. +#if defined(__APPLE__) && defined(__aarch64__) && \ + LLVM_HAS_CPP_ATTRIBUTE(gnu::naked) && __has_extension(gnu_asm) +# define LLVM_HAS_SPLIT_STACKS +# define LLVM_HAS_SPLIT_STACKS_AARCH64 +#include <sys/mman.h> +#endif + +#ifndef LLVM_HAS_SPLIT_STACKS +# include "llvm/Support/thread.h" +#endif + +using namespace llvm; + +uintptr_t llvm::getStackPointer() { +#if __GNUC__ || __has_builtin(__builtin_frame_address) + return (uintptr_t)__builtin_frame_address(0); +#elif defined(_MSC_VER) + return (uintptr_t)_AddressOfReturnAddress(); +#else + char CharOnStack = 0; + // The volatile store here is intended to escape the local variable, to + // prevent the compiler from optimizing CharOnStack into anything other + // than a char on the stack. + // + // Tested on: MSVC 2015 - 2019, GCC 4.9 - 9, Clang 3.2 - 9, ICC 13 - 19. + char *volatile Ptr = &CharOnStack; + return (uintptr_t)Ptr; +#endif +} + +unsigned llvm::getDefaultStackSize() { +#ifdef HAVE_SYS_RESOURCE_H + rlimit RL; + getrlimit(RLIMIT_STACK, &RL); ---------------- Bigcheese wrote:
I was trying to match the same behavior as we have when spawning a new thread. I think it would also be fine to just always use 8MiB, or consistently use `getDefaultStackSize()`. I don't particularly have a preference here. https://github.com/llvm/llvm-project/pull/133173 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
