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435 lines
14 KiB
C++
435 lines
14 KiB
C++
//===- llvm/unittest/Support/AllocatorTest.cpp - BumpPtrAllocator tests ---===//
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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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#include "llvm/Support/Memory.h"
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#include "llvm/Support/Process.h"
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#include "gtest/gtest.h"
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#include <cassert>
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#include <cstdlib>
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#if defined(__NetBSD__)
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// clang-format off
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <unistd.h>
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// clang-format on
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#endif
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using namespace llvm;
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using namespace sys;
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namespace {
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bool IsMPROTECT() {
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#if defined(__NetBSD__)
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int mib[3];
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int paxflags;
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size_t len = sizeof(paxflags);
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mib[0] = CTL_PROC;
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mib[1] = getpid();
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mib[2] = PROC_PID_PAXFLAGS;
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if (sysctl(mib, 3, &paxflags, &len, NULL, 0) != 0)
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err(EXIT_FAILURE, "sysctl");
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return !!(paxflags & CTL_PROC_PAXFLAGS_MPROTECT);
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#elif defined(__APPLE__) && defined(__aarch64__)
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return true;
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#else
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return false;
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#endif
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}
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class MappedMemoryTest : public ::testing::TestWithParam<unsigned> {
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public:
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MappedMemoryTest() {
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Flags = GetParam();
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PageSize = sys::Process::getPageSizeEstimate();
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}
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protected:
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// Adds RW flags to permit testing of the resulting memory
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unsigned getTestableEquivalent(unsigned RequestedFlags) {
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switch (RequestedFlags) {
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case Memory::MF_READ:
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case Memory::MF_WRITE:
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case Memory::MF_READ|Memory::MF_WRITE:
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return Memory::MF_READ|Memory::MF_WRITE;
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case Memory::MF_READ|Memory::MF_EXEC:
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case Memory::MF_READ|Memory::MF_WRITE|Memory::MF_EXEC:
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case Memory::MF_EXEC:
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return Memory::MF_READ|Memory::MF_WRITE|Memory::MF_EXEC;
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}
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// Default in case values are added to the enum, as required by some compilers
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return Memory::MF_READ|Memory::MF_WRITE;
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}
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// Returns true if the memory blocks overlap
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bool doesOverlap(MemoryBlock M1, MemoryBlock M2) {
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if (M1.base() == M2.base())
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return true;
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if (M1.base() > M2.base())
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return (unsigned char *)M2.base() + M2.allocatedSize() > M1.base();
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return (unsigned char *)M1.base() + M1.allocatedSize() > M2.base();
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}
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unsigned Flags;
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size_t PageSize;
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};
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// MPROTECT prevents W+X mmaps
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#define CHECK_UNSUPPORTED() \
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do { \
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if ((Flags & Memory::MF_WRITE) && (Flags & Memory::MF_EXEC) && \
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IsMPROTECT()) \
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return; \
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} while (0)
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TEST_P(MappedMemoryTest, AllocAndRelease) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(sizeof(int), nullptr, Flags,EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(sizeof(int), M1.allocatedSize());
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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}
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TEST_P(MappedMemoryTest, AllocAndReleaseHuge) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(
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sizeof(int), nullptr, Flags | Memory::MF_HUGE_HINT, EC);
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EXPECT_EQ(std::error_code(), EC);
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// Test large/huge memory pages. In the worst case, 4kb pages should be
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// returned, if large pages aren't available.
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EXPECT_NE((void *)nullptr, M1.base());
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EXPECT_LE(sizeof(int), M1.allocatedSize());
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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}
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TEST_P(MappedMemoryTest, MultipleAllocAndRelease) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(16, nullptr, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(64, nullptr, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(32, nullptr, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(16U, M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(64U, M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(32U, M3.allocatedSize());
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EXPECT_FALSE(doesOverlap(M1, M2));
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EXPECT_FALSE(doesOverlap(M2, M3));
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EXPECT_FALSE(doesOverlap(M1, M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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MemoryBlock M4 = Memory::allocateMappedMemory(16, nullptr, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M4.base());
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EXPECT_LE(16U, M4.allocatedSize());
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EXPECT_FALSE(Memory::releaseMappedMemory(M4));
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, BasicWrite) {
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// This test applies only to readable and writeable combinations
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if (Flags &&
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!((Flags & Memory::MF_READ) && (Flags & Memory::MF_WRITE)))
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return;
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(sizeof(int), nullptr, Flags,EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(sizeof(int), M1.allocatedSize());
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int *a = (int*)M1.base();
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*a = 1;
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EXPECT_EQ(1, *a);
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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}
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TEST_P(MappedMemoryTest, MultipleWrite) {
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// This test applies only to readable and writeable combinations
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if (Flags &&
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!((Flags & Memory::MF_READ) && (Flags & Memory::MF_WRITE)))
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return;
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(sizeof(int), nullptr, Flags,
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EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(8 * sizeof(int), nullptr, Flags,
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EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(4 * sizeof(int), nullptr, Flags,
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EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_FALSE(doesOverlap(M1, M2));
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EXPECT_FALSE(doesOverlap(M2, M3));
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EXPECT_FALSE(doesOverlap(M1, M3));
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(1U * sizeof(int), M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(8U * sizeof(int), M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(4U * sizeof(int), M3.allocatedSize());
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int *x = (int*)M1.base();
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*x = 1;
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int *y = (int*)M2.base();
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for (int i = 0; i < 8; i++) {
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y[i] = i;
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}
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int *z = (int*)M3.base();
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*z = 42;
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EXPECT_EQ(1, *x);
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EXPECT_EQ(7, y[7]);
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EXPECT_EQ(42, *z);
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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MemoryBlock M4 = Memory::allocateMappedMemory(64 * sizeof(int), nullptr,
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Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M4.base());
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EXPECT_LE(64U * sizeof(int), M4.allocatedSize());
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x = (int*)M4.base();
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*x = 4;
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EXPECT_EQ(4, *x);
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EXPECT_FALSE(Memory::releaseMappedMemory(M4));
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// Verify that M2 remains unaffected by other activity
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for (int i = 0; i < 8; i++) {
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EXPECT_EQ(i, y[i]);
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}
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, EnabledWrite) {
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// MPROTECT prevents W+X, and since this test always adds W we need
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// to block any variant with X.
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if ((Flags & Memory::MF_EXEC) && IsMPROTECT())
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return;
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(2 * sizeof(int), nullptr, Flags,
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EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(8 * sizeof(int), nullptr, Flags,
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EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(4 * sizeof(int), nullptr, Flags,
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EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(2U * sizeof(int), M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(8U * sizeof(int), M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(4U * sizeof(int), M3.allocatedSize());
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EXPECT_FALSE(Memory::protectMappedMemory(M1, getTestableEquivalent(Flags)));
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EXPECT_FALSE(Memory::protectMappedMemory(M2, getTestableEquivalent(Flags)));
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EXPECT_FALSE(Memory::protectMappedMemory(M3, getTestableEquivalent(Flags)));
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EXPECT_FALSE(doesOverlap(M1, M2));
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EXPECT_FALSE(doesOverlap(M2, M3));
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EXPECT_FALSE(doesOverlap(M1, M3));
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int *x = (int*)M1.base();
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*x = 1;
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int *y = (int*)M2.base();
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for (unsigned int i = 0; i < 8; i++) {
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y[i] = i;
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}
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int *z = (int*)M3.base();
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*z = 42;
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EXPECT_EQ(1, *x);
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EXPECT_EQ(7, y[7]);
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EXPECT_EQ(42, *z);
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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EXPECT_EQ(6, y[6]);
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MemoryBlock M4 = Memory::allocateMappedMemory(16, nullptr, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M4.base());
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EXPECT_LE(16U, M4.allocatedSize());
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EXPECT_EQ(std::error_code(),
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Memory::protectMappedMemory(M4, getTestableEquivalent(Flags)));
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x = (int*)M4.base();
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*x = 4;
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EXPECT_EQ(4, *x);
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EXPECT_FALSE(Memory::releaseMappedMemory(M4));
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, SuccessiveNear) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock M1 = Memory::allocateMappedMemory(16, nullptr, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(64, &M1, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(32, &M2, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(16U, M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(64U, M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(32U, M3.allocatedSize());
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EXPECT_FALSE(doesOverlap(M1, M2));
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EXPECT_FALSE(doesOverlap(M2, M3));
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EXPECT_FALSE(doesOverlap(M1, M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, DuplicateNear) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock Near((void*)(3*PageSize), 16);
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MemoryBlock M1 = Memory::allocateMappedMemory(16, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(64, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(32, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(16U, M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(64U, M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(32U, M3.allocatedSize());
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, ZeroNear) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock Near(nullptr, 0);
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MemoryBlock M1 = Memory::allocateMappedMemory(16, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(64, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(32, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(16U, M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(64U, M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(32U, M3.allocatedSize());
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EXPECT_FALSE(doesOverlap(M1, M2));
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EXPECT_FALSE(doesOverlap(M2, M3));
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EXPECT_FALSE(doesOverlap(M1, M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, ZeroSizeNear) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock Near((void*)(4*PageSize), 0);
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MemoryBlock M1 = Memory::allocateMappedMemory(16, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M2 = Memory::allocateMappedMemory(64, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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MemoryBlock M3 = Memory::allocateMappedMemory(32, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(16U, M1.allocatedSize());
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EXPECT_NE((void*)nullptr, M2.base());
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EXPECT_LE(64U, M2.allocatedSize());
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EXPECT_NE((void*)nullptr, M3.base());
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EXPECT_LE(32U, M3.allocatedSize());
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EXPECT_FALSE(doesOverlap(M1, M2));
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EXPECT_FALSE(doesOverlap(M2, M3));
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EXPECT_FALSE(doesOverlap(M1, M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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EXPECT_FALSE(Memory::releaseMappedMemory(M3));
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EXPECT_FALSE(Memory::releaseMappedMemory(M2));
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}
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TEST_P(MappedMemoryTest, UnalignedNear) {
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CHECK_UNSUPPORTED();
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std::error_code EC;
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MemoryBlock Near((void*)(2*PageSize+5), 0);
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MemoryBlock M1 = Memory::allocateMappedMemory(15, &Near, Flags, EC);
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EXPECT_EQ(std::error_code(), EC);
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EXPECT_NE((void*)nullptr, M1.base());
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EXPECT_LE(sizeof(int), M1.allocatedSize());
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EXPECT_FALSE(Memory::releaseMappedMemory(M1));
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}
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// Note that Memory::MF_WRITE is not supported exclusively across
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// operating systems and architectures and can imply MF_READ|MF_WRITE
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unsigned MemoryFlags[] = {
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Memory::MF_READ,
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Memory::MF_WRITE,
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Memory::MF_READ|Memory::MF_WRITE,
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Memory::MF_EXEC,
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Memory::MF_READ|Memory::MF_EXEC,
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Memory::MF_READ|Memory::MF_WRITE|Memory::MF_EXEC
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};
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INSTANTIATE_TEST_SUITE_P(AllocationTests, MappedMemoryTest,
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::testing::ValuesIn(MemoryFlags));
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} // anonymous namespace
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