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//===-- SubprocessMemoryTest.cpp --------------------------------*- C++ -*-===//
//
// 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 "SubprocessMemory.h"
#include "X86/TestBase.h"
#include "gtest/gtest.h"
#include <string>
#include <unordered_map>
#ifdef __linux__
#include <endian.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <unistd.h>
#endif // __linux__
namespace llvm {
namespace exegesis {
#if defined(__linux__) && !defined(__ANDROID__) && \
!(defined(__powerpc__) || defined(__s390x__) || defined(__sparc__))
// This needs to be updated anytime a test is added or removed from the test
// suite.
static constexpr const size_t TestCount = 4;
class SubprocessMemoryTest : public X86TestBase {
protected:
int getSharedMemoryNumber(const unsigned TestNumber) {
// Do a process similar to 2D array indexing so that each process gets it's
// own shared memory space to avoid collisions. This will not overflow as
// the maximum value a PID can take on is 10^22.
return getpid() * TestCount + TestNumber;
}
void
testCommon(std::unordered_map<std::string, MemoryValue> MemoryDefinitions,
const unsigned TestNumber) {
EXPECT_FALSE(
SM.initializeSubprocessMemory(getSharedMemoryNumber(TestNumber)));
EXPECT_FALSE(SM.addMemoryDefinition(MemoryDefinitions,
getSharedMemoryNumber(TestNumber)));
}
std::string getSharedMemoryName(const unsigned TestNumber,
const unsigned DefinitionNumber) {
long CurrentTID = syscall(SYS_gettid);
return "/" + std::to_string(getSharedMemoryNumber(TestNumber)) + "t" +
std::to_string(CurrentTID) + "memdef" +
std::to_string(DefinitionNumber);
}
void checkSharedMemoryDefinition(const std::string &DefinitionName,
size_t DefinitionSize,
std::vector<uint8_t> ExpectedValue) {
int SharedMemoryFD =
shm_open(DefinitionName.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
uint8_t *SharedMemoryMapping = (uint8_t *)mmap(
NULL, DefinitionSize, PROT_READ, MAP_SHARED, SharedMemoryFD, 0);
EXPECT_NE((intptr_t)SharedMemoryMapping, -1);
for (size_t I = 0; I < ExpectedValue.size(); ++I) {
EXPECT_EQ(SharedMemoryMapping[I], ExpectedValue[I]);
}
munmap(SharedMemoryMapping, DefinitionSize);
}
SubprocessMemory SM;
};
// Some of the tests below are failing on s390x and PPC due to the shared
// memory calls not working in some cases, so they have been disabled.
// TODO(boomanaiden154): Investigate and fix this issue on PPC.
TEST_F(SubprocessMemoryTest, OneDefinition) {
testCommon({{"test1", {APInt(8, 0xff), 4096, 0}}}, 0);
checkSharedMemoryDefinition(getSharedMemoryName(0, 0), 4096, {0xff});
}
TEST_F(SubprocessMemoryTest, MultipleDefinitions) {
testCommon({{"test1", {APInt(8, 0xaa), 4096, 0}},
{"test2", {APInt(8, 0xbb), 4096, 1}},
{"test3", {APInt(8, 0xcc), 4096, 2}}},
1);
checkSharedMemoryDefinition(getSharedMemoryName(1, 0), 4096, {0xaa});
checkSharedMemoryDefinition(getSharedMemoryName(1, 1), 4096, {0xbb});
checkSharedMemoryDefinition(getSharedMemoryName(1, 2), 4096, {0xcc});
}
TEST_F(SubprocessMemoryTest, DefinitionFillsCompletely) {
testCommon({{"test1", {APInt(8, 0xaa), 4096, 0}},
{"test2", {APInt(16, 0xbbbb), 4096, 1}},
{"test3", {APInt(24, 0xcccccc), 4096, 2}}},
2);
std::vector<uint8_t> Test1Expected(512, 0xaa);
std::vector<uint8_t> Test2Expected(512, 0xbb);
std::vector<uint8_t> Test3Expected(512, 0xcc);
checkSharedMemoryDefinition(getSharedMemoryName(2, 0), 4096, Test1Expected);
checkSharedMemoryDefinition(getSharedMemoryName(2, 1), 4096, Test2Expected);
checkSharedMemoryDefinition(getSharedMemoryName(2, 2), 4096, Test3Expected);
}
// The following test is only supported on little endian systems.
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
TEST_F(SubprocessMemoryTest, DISABLED_DefinitionEndTruncation) {
#else
TEST_F(SubprocessMemoryTest, DefinitionEndTruncation) {
#endif
testCommon({{"test1", {APInt(48, 0xaabbccddeeff), 4096, 0}}}, 3);
std::vector<uint8_t> Test1Expected(512, 0);
// order is reversed since we're assuming a little endian system.
for (size_t I = 0; I < Test1Expected.size(); ++I) {
switch (I % 6) {
case 0:
Test1Expected[I] = 0xff;
break;
case 1:
Test1Expected[I] = 0xee;
break;
case 2:
Test1Expected[I] = 0xdd;
break;
case 3:
Test1Expected[I] = 0xcc;
break;
case 4:
Test1Expected[I] = 0xbb;
break;
case 5:
Test1Expected[I] = 0xaa;
}
}
checkSharedMemoryDefinition(getSharedMemoryName(3, 0), 4096, Test1Expected);
}
#endif // __linux__ && !__ANDROID__ && !(__powerpc__ || __s390x__ || __sparc__)
} // namespace exegesis
} // namespace llvm
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