230 lines
7.4 KiB
C++
230 lines
7.4 KiB
C++
//===- llvm/unittest/Support/MemoryBufferTest.cpp - MemoryBuffer tests ----===//
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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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// This file implements unit tests for the MemoryBuffer support class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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class MemoryBufferTest : public testing::Test {
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protected:
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MemoryBufferTest()
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: data("this is some data")
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{ }
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void SetUp() override {}
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/// Common testing for different modes of getOpenFileSlice.
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/// Creates a temporary file with known contents, and uses
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/// MemoryBuffer::getOpenFileSlice to map it.
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/// If \p Reopen is true, the file is closed after creating and reopened
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/// anew before using MemoryBuffer.
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void testGetOpenFileSlice(bool Reopen);
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typedef std::unique_ptr<MemoryBuffer> OwningBuffer;
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std::string data;
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};
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TEST_F(MemoryBufferTest, get) {
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// Default name and null-terminator flag
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OwningBuffer MB1(MemoryBuffer::getMemBuffer(data));
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EXPECT_TRUE(nullptr != MB1.get());
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// RequiresNullTerminator = false
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OwningBuffer MB2(MemoryBuffer::getMemBuffer(data, "one", false));
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EXPECT_TRUE(nullptr != MB2.get());
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// RequiresNullTerminator = true
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OwningBuffer MB3(MemoryBuffer::getMemBuffer(data, "two", true));
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EXPECT_TRUE(nullptr != MB3.get());
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// verify all 3 buffers point to the same address
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EXPECT_EQ(MB1->getBufferStart(), MB2->getBufferStart());
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EXPECT_EQ(MB2->getBufferStart(), MB3->getBufferStart());
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// verify the original data is unmodified after deleting the buffers
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MB1.reset();
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MB2.reset();
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MB3.reset();
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EXPECT_EQ("this is some data", data);
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}
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TEST_F(MemoryBufferTest, NullTerminator4K) {
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// Test that a file with size that is a multiple of the page size can be null
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// terminated correctly by MemoryBuffer.
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int TestFD;
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SmallString<64> TestPath;
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sys::fs::createTemporaryFile("MemoryBufferTest_NullTerminator4K", "temp",
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TestFD, TestPath);
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FileRemover Cleanup(TestPath);
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raw_fd_ostream OF(TestFD, true, /*unbuffered=*/true);
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for (unsigned i = 0; i < 4096 / 16; ++i) {
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OF << "0123456789abcdef";
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}
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OF.close();
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ErrorOr<OwningBuffer> MB = MemoryBuffer::getFile(TestPath.c_str());
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std::error_code EC = MB.getError();
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ASSERT_FALSE(EC);
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const char *BufData = MB.get()->getBufferStart();
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EXPECT_EQ('f', BufData[4095]);
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EXPECT_EQ('\0', BufData[4096]);
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}
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TEST_F(MemoryBufferTest, copy) {
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// copy with no name
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OwningBuffer MBC1(MemoryBuffer::getMemBufferCopy(data));
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EXPECT_TRUE(nullptr != MBC1.get());
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// copy with a name
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OwningBuffer MBC2(MemoryBuffer::getMemBufferCopy(data, "copy"));
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EXPECT_TRUE(nullptr != MBC2.get());
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// verify the two copies do not point to the same place
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EXPECT_NE(MBC1->getBufferStart(), MBC2->getBufferStart());
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}
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TEST_F(MemoryBufferTest, make_new) {
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// 0-sized buffer
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OwningBuffer Zero(MemoryBuffer::getNewUninitMemBuffer(0));
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EXPECT_TRUE(nullptr != Zero.get());
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// uninitialized buffer with no name
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OwningBuffer One(MemoryBuffer::getNewUninitMemBuffer(321));
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EXPECT_TRUE(nullptr != One.get());
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// uninitialized buffer with name
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OwningBuffer Two(MemoryBuffer::getNewUninitMemBuffer(123, "bla"));
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EXPECT_TRUE(nullptr != Two.get());
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// 0-initialized buffer with no name
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OwningBuffer Three(MemoryBuffer::getNewMemBuffer(321, data));
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EXPECT_TRUE(nullptr != Three.get());
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for (size_t i = 0; i < 321; ++i)
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EXPECT_EQ(0, Three->getBufferStart()[0]);
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// 0-initialized buffer with name
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OwningBuffer Four(MemoryBuffer::getNewMemBuffer(123, "zeros"));
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EXPECT_TRUE(nullptr != Four.get());
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for (size_t i = 0; i < 123; ++i)
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EXPECT_EQ(0, Four->getBufferStart()[0]);
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}
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void MemoryBufferTest::testGetOpenFileSlice(bool Reopen) {
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// Test that MemoryBuffer::getOpenFile works properly when no null
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// terminator is requested and the size is large enough to trigger
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// the usage of memory mapping.
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int TestFD;
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SmallString<64> TestPath;
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// Create a temporary file and write data into it.
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sys::fs::createTemporaryFile("prefix", "temp", TestFD, TestPath);
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FileRemover Cleanup(TestPath);
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// OF is responsible for closing the file; If the file is not
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// reopened, it will be unbuffered so that the results are
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// immediately visible through the fd.
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raw_fd_ostream OF(TestFD, true, !Reopen);
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for (int i = 0; i < 60000; ++i) {
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OF << "0123456789";
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}
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if (Reopen) {
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OF.close();
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EXPECT_FALSE(sys::fs::openFileForRead(TestPath.c_str(), TestFD));
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}
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ErrorOr<OwningBuffer> Buf =
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MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(),
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40000, // Size
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80000 // Offset
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);
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std::error_code EC = Buf.getError();
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EXPECT_FALSE(EC);
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StringRef BufData = Buf.get()->getBuffer();
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EXPECT_EQ(BufData.size(), 40000U);
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EXPECT_EQ(BufData[0], '0');
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EXPECT_EQ(BufData[9], '9');
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}
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TEST_F(MemoryBufferTest, getOpenFileNoReopen) {
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testGetOpenFileSlice(false);
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}
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TEST_F(MemoryBufferTest, getOpenFileReopened) {
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testGetOpenFileSlice(true);
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}
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TEST_F(MemoryBufferTest, reference) {
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OwningBuffer MB(MemoryBuffer::getMemBuffer(data));
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MemoryBufferRef MBR(*MB);
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EXPECT_EQ(MB->getBufferStart(), MBR.getBufferStart());
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EXPECT_EQ(MB->getBufferIdentifier(), MBR.getBufferIdentifier());
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}
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TEST_F(MemoryBufferTest, slice) {
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// Create a file that is six pages long with different data on each page.
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int FD;
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SmallString<64> TestPath;
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sys::fs::createTemporaryFile("MemoryBufferTest_Slice", "temp", FD, TestPath);
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FileRemover Cleanup(TestPath);
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raw_fd_ostream OF(FD, true, /*unbuffered=*/true);
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for (unsigned i = 0; i < 0x2000 / 8; ++i) {
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OF << "12345678";
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}
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for (unsigned i = 0; i < 0x2000 / 8; ++i) {
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OF << "abcdefgh";
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}
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for (unsigned i = 0; i < 0x2000 / 8; ++i) {
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OF << "ABCDEFGH";
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}
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OF.close();
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// Try offset of one page.
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ErrorOr<OwningBuffer> MB = MemoryBuffer::getFileSlice(TestPath.str(),
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0x4000, 0x1000);
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std::error_code EC = MB.getError();
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ASSERT_FALSE(EC);
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EXPECT_EQ(0x4000UL, MB.get()->getBufferSize());
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StringRef BufData = MB.get()->getBuffer();
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EXPECT_TRUE(BufData.substr(0x0000,8).equals("12345678"));
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EXPECT_TRUE(BufData.substr(0x0FF8,8).equals("12345678"));
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EXPECT_TRUE(BufData.substr(0x1000,8).equals("abcdefgh"));
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EXPECT_TRUE(BufData.substr(0x2FF8,8).equals("abcdefgh"));
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EXPECT_TRUE(BufData.substr(0x3000,8).equals("ABCDEFGH"));
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EXPECT_TRUE(BufData.substr(0x3FF8,8).equals("ABCDEFGH"));
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// Try non-page aligned.
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ErrorOr<OwningBuffer> MB2 = MemoryBuffer::getFileSlice(TestPath.str(),
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0x3000, 0x0800);
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EC = MB2.getError();
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ASSERT_FALSE(EC);
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EXPECT_EQ(0x3000UL, MB2.get()->getBufferSize());
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StringRef BufData2 = MB2.get()->getBuffer();
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EXPECT_TRUE(BufData2.substr(0x0000,8).equals("12345678"));
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EXPECT_TRUE(BufData2.substr(0x17F8,8).equals("12345678"));
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EXPECT_TRUE(BufData2.substr(0x1800,8).equals("abcdefgh"));
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EXPECT_TRUE(BufData2.substr(0x2FF8,8).equals("abcdefgh"));
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}
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}
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