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//===- llvm/unittest/Support/MemoryBufferTest.cpp - MemoryBuffer tests ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements unit tests for the MemoryBuffer support class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "gtest/gtest.h"
using namespace llvm;
using std::error_code;
namespace {
class MemoryBufferTest : public testing::Test {
protected:
MemoryBufferTest()
: data("this is some data")
{ }
virtual void SetUp() { }
/// Common testing for different modes of getOpenFileSlice.
/// Creates a temporary file with known contents, and uses
/// MemoryBuffer::getOpenFileSlice to map it.
/// If \p Reopen is true, the file is closed after creating and reopened
/// anew before using MemoryBuffer.
void testGetOpenFileSlice(bool Reopen);
typedef std::unique_ptr<MemoryBuffer> OwningBuffer;
std::string data;
};
TEST_F(MemoryBufferTest, get) {
// Default name and null-terminator flag
OwningBuffer MB1(MemoryBuffer::getMemBuffer(data));
EXPECT_TRUE(nullptr != MB1.get());
// RequiresNullTerminator = false
OwningBuffer MB2(MemoryBuffer::getMemBuffer(data, "one", false));
EXPECT_TRUE(nullptr != MB2.get());
// RequiresNullTerminator = true
OwningBuffer MB3(MemoryBuffer::getMemBuffer(data, "two", true));
EXPECT_TRUE(nullptr != MB3.get());
// verify all 3 buffers point to the same address
EXPECT_EQ(MB1->getBufferStart(), MB2->getBufferStart());
EXPECT_EQ(MB2->getBufferStart(), MB3->getBufferStart());
// verify the original data is unmodified after deleting the buffers
MB1.reset();
MB2.reset();
MB3.reset();
EXPECT_EQ("this is some data", data);
}
TEST_F(MemoryBufferTest, NullTerminator4K) {
// Test that a file with size that is a multiple of the page size can be null
// terminated correctly by MemoryBuffer.
int TestFD;
SmallString<64> TestPath;
sys::fs::createTemporaryFile("MemoryBufferTest_NullTerminator4K", "temp",
TestFD, TestPath);
raw_fd_ostream OF(TestFD, true, /*unbuffered=*/true);
for (unsigned i = 0; i < 4096 / 16; ++i) {
OF << "0123456789abcdef";
}
OF.close();
OwningBuffer MB;
error_code EC = MemoryBuffer::getFile(TestPath.c_str(), MB);
ASSERT_FALSE(EC);
const char *BufData = MB->getBufferStart();
EXPECT_EQ('f', BufData[4095]);
EXPECT_EQ('\0', BufData[4096]);
}
TEST_F(MemoryBufferTest, copy) {
// copy with no name
OwningBuffer MBC1(MemoryBuffer::getMemBufferCopy(data));
EXPECT_TRUE(nullptr != MBC1.get());
// copy with a name
OwningBuffer MBC2(MemoryBuffer::getMemBufferCopy(data, "copy"));
EXPECT_TRUE(nullptr != MBC2.get());
// verify the two copies do not point to the same place
EXPECT_NE(MBC1->getBufferStart(), MBC2->getBufferStart());
}
TEST_F(MemoryBufferTest, make_new) {
// 0-sized buffer
OwningBuffer Zero(MemoryBuffer::getNewUninitMemBuffer(0));
EXPECT_TRUE(nullptr != Zero.get());
// uninitialized buffer with no name
OwningBuffer One(MemoryBuffer::getNewUninitMemBuffer(321));
EXPECT_TRUE(nullptr != One.get());
// uninitialized buffer with name
OwningBuffer Two(MemoryBuffer::getNewUninitMemBuffer(123, "bla"));
EXPECT_TRUE(nullptr != Two.get());
// 0-initialized buffer with no name
OwningBuffer Three(MemoryBuffer::getNewMemBuffer(321, data));
EXPECT_TRUE(nullptr != Three.get());
for (size_t i = 0; i < 321; ++i)
EXPECT_EQ(0, Three->getBufferStart()[0]);
// 0-initialized buffer with name
OwningBuffer Four(MemoryBuffer::getNewMemBuffer(123, "zeros"));
EXPECT_TRUE(nullptr != Four.get());
for (size_t i = 0; i < 123; ++i)
EXPECT_EQ(0, Four->getBufferStart()[0]);
}
void MemoryBufferTest::testGetOpenFileSlice(bool Reopen) {
// Test that MemoryBuffer::getOpenFile works properly when no null
// terminator is requested and the size is large enough to trigger
// the usage of memory mapping.
int TestFD;
SmallString<64> TestPath;
// Create a temporary file and write data into it.
sys::fs::createTemporaryFile("prefix", "temp", TestFD, TestPath);
// OF is responsible for closing the file; If the file is not
// reopened, it will be unbuffered so that the results are
// immediately visible through the fd.
raw_fd_ostream OF(TestFD, true, !Reopen);
for (int i = 0; i < 60000; ++i) {
OF << "0123456789";
}
if (Reopen) {
OF.close();
EXPECT_FALSE(sys::fs::openFileForRead(TestPath.c_str(), TestFD));
}
OwningBuffer Buf;
error_code EC = MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(), Buf,
40000, // Size
80000 // Offset
);
EXPECT_FALSE(EC);
StringRef BufData = Buf->getBuffer();
EXPECT_EQ(BufData.size(), 40000U);
EXPECT_EQ(BufData[0], '0');
EXPECT_EQ(BufData[9], '9');
}
TEST_F(MemoryBufferTest, getOpenFileNoReopen) {
testGetOpenFileSlice(false);
}
TEST_F(MemoryBufferTest, getOpenFileReopened) {
testGetOpenFileSlice(true);
}
}
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