Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/unittests/Bitcode/BitstreamReaderTest.cpp

@@ -0,0 +1,151 @@
+//===- BitstreamReaderTest.cpp - Tests for BitstreamReader ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Bitcode/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());
+  (void)Cursor.Read(8);
+  EXPECT_FALSE(Cursor.AtEndOfStream());
+  (void)Cursor.Read(24);
+  EXPECT_TRUE(Cursor.AtEndOfStream());
+
+  Cursor.JumpToBit(0);
+  EXPECT_FALSE(Cursor.AtEndOfStream());
+
+  Cursor.JumpToBit(32);
+  EXPECT_TRUE(Cursor.AtEndOfStream());
+}
+
+TEST(BitstreamReaderTest, AtEndOfStreamJump) {
+  uint8_t Bytes[4] = {
+    0x00, 0x01, 0x02, 0x03
+  };
+  BitstreamCursor Cursor(Bytes);
+
+  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());
+    (void)Cursor.Read(1);
+  }
+  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.
+    ASSERT_EQ(Magic, Stream.Read(32));
+
+    // Block.
+    BitstreamEntry Entry =
+        Stream.advance(BitstreamCursor::AF_DontAutoprocessAbbrevs);
+    ASSERT_EQ(BitstreamEntry::SubBlock, Entry.Kind);
+    ASSERT_EQ(BlockID, Entry.ID);
+    ASSERT_FALSE(Stream.EnterSubBlock(BlockID));
+
+    // Abbreviation.
+    Entry = Stream.advance();
+    ASSERT_EQ(BitstreamEntry::Record, Entry.Kind);
+    ASSERT_EQ(AbbrevID, Entry.ID);
+
+    // Record.
+    StringRef BlobOut;
+    SmallVector<uint64_t, 1> Record;
+    ASSERT_EQ(RecordID, Stream.readRecord(Entry.ID, Record, &BlobOut));
+    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));
+    EXPECT_EQ(8ull, Cursor.Read(8));
+  }
+}
+
+} // end anonymous namespace