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This will allow external callers of these functions to switch over time rather than forcing a breaking change all a once. These particular functions were determined by building clang/lld/lldb. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202959 91177308-0d34-0410-b5e6-96231b3b80d8
172 lines
5.2 KiB
C++
172 lines
5.2 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/FileSystem.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/Support/MemoryBuffer.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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virtual void SetUp() { }
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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 OwningPtr<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(0 != 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(0 != 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(0 != 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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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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OwningBuffer MB;
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error_code EC = MemoryBuffer::getFile(TestPath.c_str(), MB);
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ASSERT_FALSE(EC);
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const char *BufData = MB->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(0 != 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(0 != 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(0 != 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(0 != 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(0 != 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(0 != 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(0 != 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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// 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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OwningBuffer Buf;
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error_code EC = MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(), Buf,
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40000, // Size
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80000 // Offset
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);
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EXPECT_FALSE(EC);
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StringRef BufData = Buf->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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}
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