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| //===- BitstreamReaderTest.cpp - Tests for BitstreamReader ----------------===//
//
// 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 "llvm/Bitstream/BitstreamReader.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Bitstream/BitstreamWriter.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
TEST(BitstreamReaderTest, AtEndOfStream) {
uint8_t Bytes[4] = {
0x00, 0x01, 0x02, 0x03
};
BitstreamCursor Cursor(Bytes);
EXPECT_FALSE(Cursor.AtEndOfStream());
Expected<SimpleBitstreamCursor::word_t> MaybeRead = Cursor.Read(8);
EXPECT_TRUE((bool)MaybeRead);
EXPECT_FALSE(Cursor.AtEndOfStream());
MaybeRead = Cursor.Read(24);
EXPECT_TRUE((bool)MaybeRead);
EXPECT_TRUE(Cursor.AtEndOfStream());
EXPECT_FALSE(Cursor.JumpToBit(0));
EXPECT_FALSE(Cursor.AtEndOfStream());
EXPECT_FALSE(Cursor.JumpToBit(32));
EXPECT_TRUE(Cursor.AtEndOfStream());
}
TEST(BitstreamReaderTest, AtEndOfStreamJump) {
uint8_t Bytes[4] = {
0x00, 0x01, 0x02, 0x03
};
BitstreamCursor Cursor(Bytes);
EXPECT_FALSE(Cursor.JumpToBit(32));
EXPECT_TRUE(Cursor.AtEndOfStream());
}
TEST(BitstreamReaderTest, AtEndOfStreamEmpty) {
BitstreamCursor Cursor(ArrayRef<uint8_t>{});
EXPECT_TRUE(Cursor.AtEndOfStream());
}
TEST(BitstreamReaderTest, getCurrentByteNo) {
uint8_t Bytes[] = {0x00, 0x01, 0x02, 0x03};
SimpleBitstreamCursor Cursor(Bytes);
for (unsigned I = 0, E = 32; I != E; ++I) {
EXPECT_EQ(I / 8, Cursor.getCurrentByteNo());
Expected<SimpleBitstreamCursor::word_t> MaybeRead = Cursor.Read(1);
EXPECT_TRUE((bool)MaybeRead);
}
EXPECT_EQ(4u, Cursor.getCurrentByteNo());
}
TEST(BitstreamReaderTest, getPointerToByte) {
uint8_t Bytes[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
SimpleBitstreamCursor Cursor(Bytes);
for (unsigned I = 0, E = 8; I != E; ++I) {
EXPECT_EQ(Bytes + I, Cursor.getPointerToByte(I, 1));
}
}
TEST(BitstreamReaderTest, getPointerToBit) {
uint8_t Bytes[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
SimpleBitstreamCursor Cursor(Bytes);
for (unsigned I = 0, E = 8; I != E; ++I) {
EXPECT_EQ(Bytes + I, Cursor.getPointerToBit(I * 8, 1));
}
}
TEST(BitstreamReaderTest, readRecordWithBlobWhileStreaming) {
SmallVector<uint8_t, 1> BlobData;
for (unsigned I = 0, E = 1024; I != E; ++I)
BlobData.push_back(I);
// Try a bunch of different sizes.
const unsigned Magic = 0x12345678;
const unsigned BlockID = bitc::FIRST_APPLICATION_BLOCKID;
const unsigned RecordID = 1;
for (unsigned I = 0, BlobSize = 0, E = BlobData.size(); BlobSize < E;
BlobSize += ++I) {
StringRef BlobIn((const char *)BlobData.begin(), BlobSize);
// Write the bitcode.
SmallVector<char, 1> Buffer;
unsigned AbbrevID;
{
BitstreamWriter Stream(Buffer);
Stream.Emit(Magic, 32);
Stream.EnterSubblock(BlockID, 3);
auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(RecordID));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
AbbrevID = Stream.EmitAbbrev(std::move(Abbrev));
unsigned Record[] = {RecordID};
Stream.EmitRecordWithBlob(AbbrevID, makeArrayRef(Record), BlobIn);
Stream.ExitBlock();
}
// Stream the buffer into the reader.
BitstreamCursor Stream(
ArrayRef<uint8_t>((const uint8_t *)Buffer.begin(), Buffer.size()));
// Header. Included in test so that we can run llvm-bcanalyzer to debug
// when there are problems.
Expected<SimpleBitstreamCursor::word_t> MaybeRead = Stream.Read(32);
ASSERT_TRUE((bool)MaybeRead);
ASSERT_EQ(Magic, MaybeRead.get());
// Block.
Expected<BitstreamEntry> MaybeEntry =
Stream.advance(BitstreamCursor::AF_DontAutoprocessAbbrevs);
ASSERT_TRUE((bool)MaybeEntry);
BitstreamEntry Entry = MaybeEntry.get();
ASSERT_EQ(BitstreamEntry::SubBlock, Entry.Kind);
ASSERT_EQ(BlockID, Entry.ID);
ASSERT_FALSE(Stream.EnterSubBlock(BlockID));
// Abbreviation.
MaybeEntry = Stream.advance();
ASSERT_TRUE((bool)MaybeEntry);
Entry = MaybeEntry.get();
ASSERT_EQ(BitstreamEntry::Record, Entry.Kind);
ASSERT_EQ(AbbrevID, Entry.ID);
// Record.
StringRef BlobOut;
SmallVector<uint64_t, 1> Record;
Expected<unsigned> MaybeRecord =
Stream.readRecord(Entry.ID, Record, &BlobOut);
ASSERT_TRUE((bool)MaybeRecord);
ASSERT_EQ(RecordID, MaybeRecord.get());
EXPECT_TRUE(Record.empty());
EXPECT_EQ(BlobIn, BlobOut);
}
}
TEST(BitstreamReaderTest, shortRead) {
uint8_t Bytes[] = {8, 7, 6, 5, 4, 3, 2, 1};
for (unsigned I = 1; I != 8; ++I) {
SimpleBitstreamCursor Cursor(ArrayRef<uint8_t>(Bytes, I));
Expected<SimpleBitstreamCursor::word_t> MaybeRead = Cursor.Read(8);
ASSERT_TRUE((bool)MaybeRead);
EXPECT_EQ(8ull, MaybeRead.get());
}
}
static_assert(is_trivially_copyable<BitCodeAbbrevOp>::value,
"trivially copyable");
} // end anonymous namespace
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