3e21ea1f65
This will not be used unless the C++ standard version is raised to 20. As concepts and C++20 more generally are quite new, this does not do so. Nevertheless, the use of concepts can improve the local development experience as type mismatches are discovered earlier (at template invocation rather than only during expansion).
92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
#pragma once
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#include "../ds/concept.h"
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#include "pal_concept.h"
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#include "pal_consts.h"
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// If simultating OE, then we need the underlying platform
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#if defined(OPEN_ENCLAVE)
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# include "pal_open_enclave.h"
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#endif
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#if !defined(OPEN_ENCLAVE) || defined(OPEN_ENCLAVE_SIMULATION)
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# include "pal_apple.h"
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# include "pal_freebsd.h"
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# include "pal_freebsd_kernel.h"
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# include "pal_haiku.h"
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# include "pal_linux.h"
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# include "pal_netbsd.h"
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# include "pal_openbsd.h"
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# include "pal_solaris.h"
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# include "pal_windows.h"
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#endif
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#include "pal_plain.h"
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namespace snmalloc
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{
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#if !defined(OPEN_ENCLAVE) || defined(OPEN_ENCLAVE_SIMULATION)
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using DefaultPal =
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# if defined(_WIN32)
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PALWindows;
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# elif defined(__APPLE__)
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PALApple<>;
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# elif defined(__linux__)
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PALLinux;
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# elif defined(FreeBSD_KERNEL)
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PALFreeBSDKernel;
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# elif defined(__FreeBSD__)
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PALFreeBSD;
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# elif defined(__HAIKU__)
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PALHaiku;
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# elif defined(__NetBSD__)
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PALNetBSD;
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# elif defined(__OpenBSD__)
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PALOpenBSD;
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# elif defined(__sun)
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PALSolaris;
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# else
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# error Unsupported platform
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# endif
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#endif
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using Pal =
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#if defined(SNMALLOC_MEMORY_PROVIDER)
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PALPlainMixin<SNMALLOC_MEMORY_PROVIDER>;
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#elif defined(OPEN_ENCLAVE)
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PALPlainMixin<PALOpenEnclave>;
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#else
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DefaultPal;
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#endif
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[[noreturn]] SNMALLOC_SLOW_PATH inline void error(const char* const str)
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{
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Pal::error(str);
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}
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/**
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* Query whether the PAL supports a specific feature.
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*/
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template<PalFeatures F, SNMALLOC_CONCEPT(ConceptPAL) PAL = Pal>
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constexpr static bool pal_supports = (PAL::pal_features & F) == F;
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// Used to keep Superslab metadata committed.
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static constexpr size_t OS_PAGE_SIZE = Pal::page_size;
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static_assert(
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bits::next_pow2_const(OS_PAGE_SIZE) == OS_PAGE_SIZE,
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"OS_PAGE_SIZE must be a power of two");
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static_assert(
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OS_PAGE_SIZE % Aal::smallest_page_size == 0,
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"The smallest architectural page size must divide OS_PAGE_SIZE");
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// Some system headers (e.g. Linux' sys/user.h, FreeBSD's machine/param.h)
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// define `PAGE_SIZE` as a macro. We don't use `PAGE_SIZE` as our variable
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// name, to avoid conflicts, but if we do see a macro definition then check
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// that our value matches the platform's expected value.
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#ifdef PAGE_SIZE
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static_assert(
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PAGE_SIZE == OS_PAGE_SIZE,
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"Page size from system header does not match snmalloc config page size.");
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#endif
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} // namespace snmalloc
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