1148dc5274
Summary: This update introduces i386 support for the Scudo Hardened Allocator, and offers software alternatives for functions that used to require hardware specific instruction sets. This should make porting to new architectures easier. Among the changes: - The chunk header has been changed to accomodate the size limitations encountered on 32-bit architectures. We now fit everything in 64-bit. This was achieved by storing the amount of unused bytes in an allocation rather than the size itself, as one can be deduced from the other with the help of the GetActuallyAllocatedSize function. As it turns out, this header can be used for both 64 and 32 bit, and as such we dropped the requirement for the 128-bit compare and exchange instruction support (cmpxchg16b). - Add 32-bit support for the checksum and the PRNG functions: if the SSE 4.2 instruction set is supported, use the 32-bit CRC32 instruction, and in the XorShift128, use a 32-bit based state instead of 64-bit. - Add software support for CRC32: if SSE 4.2 is not supported, fallback on a software implementation. - Modify tests that were not 32-bit compliant, and expand them to cover more allocation and alignment sizes. The random shuffle test has been deactivated for linux-i386 & linux-i686 as the 32-bit sanitizer allocator doesn't currently randomize chunks. Reviewers: alekseyshl, kcc Subscribers: filcab, llvm-commits, tberghammer, danalbert, srhines, mgorny, modocache Differential Revision: https://reviews.llvm.org/D26358 llvm-svn: 288255
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
//===-- scudo_new_delete.cpp ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// Interceptors for operators new and delete.
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///
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//===----------------------------------------------------------------------===//
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#include "scudo_allocator.h"
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#include "interception/interception.h"
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#include <cstddef>
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using namespace __scudo;
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#define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
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// Fake std::nothrow_t to avoid including <new>.
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namespace std {
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struct nothrow_t {};
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} // namespace std
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CXX_OPERATOR_ATTRIBUTE
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void *operator new(size_t size) {
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return scudoMalloc(size, FromNew);
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}
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CXX_OPERATOR_ATTRIBUTE
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void *operator new[](size_t size) {
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return scudoMalloc(size, FromNewArray);
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}
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CXX_OPERATOR_ATTRIBUTE
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void *operator new(size_t size, std::nothrow_t const&) {
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return scudoMalloc(size, FromNew);
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}
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CXX_OPERATOR_ATTRIBUTE
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void *operator new[](size_t size, std::nothrow_t const&) {
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return scudoMalloc(size, FromNewArray);
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}
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr) NOEXCEPT {
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return scudoFree(ptr, FromNew);
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}
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr) NOEXCEPT {
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return scudoFree(ptr, FromNewArray);
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}
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, std::nothrow_t const&) NOEXCEPT {
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return scudoFree(ptr, FromNew);
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}
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, std::nothrow_t const&) NOEXCEPT {
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return scudoFree(ptr, FromNewArray);
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}
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, size_t size) NOEXCEPT {
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scudoSizedFree(ptr, size, FromNew);
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}
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, size_t size) NOEXCEPT {
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scudoSizedFree(ptr, size, FromNewArray);
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}
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