1 files changed, 168 insertions, 0 deletions
diff --git a/unittests/Utility/DataExtractorTest.cpp b/unittests/Utility/DataExtractorTest.cpp
new file mode 100644
index 0000000000000..0267f6d140563
--- /dev/null
+++ b/unittests/Utility/DataExtractorTest.cpp
@@ -0,0 +1,168 @@
+//===-- DataExtractorTest.cpp -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+
+#include "lldb/Utility/DataExtractor.h"
+
+using namespace lldb_private;
+
+TEST(DataExtractorTest, GetBitfield) {
+  uint8_t buffer[] = {0x01, 0x23, 0x45, 0x67};
+  DataExtractor LE(buffer, sizeof(buffer), lldb::eByteOrderLittle,
+                   sizeof(void *));
+  DataExtractor BE(buffer, sizeof(buffer), lldb::eByteOrderBig, sizeof(void *));
+
+  lldb::offset_t offset;
+
+  offset = 0;
+  ASSERT_EQ(buffer[1], LE.GetMaxU64Bitfield(&offset, sizeof(buffer), 8, 8));
+  offset = 0;
+  ASSERT_EQ(buffer[1], BE.GetMaxU64Bitfield(&offset, sizeof(buffer), 8, 8));
+
+  offset = 0;
+  ASSERT_EQ(int8_t(buffer[1]),
+            LE.GetMaxS64Bitfield(&offset, sizeof(buffer), 8, 8));
+  offset = 0;
+  ASSERT_EQ(int8_t(buffer[1]),
+            BE.GetMaxS64Bitfield(&offset, sizeof(buffer), 8, 8));
+}
+
+TEST(DataExtractorTest, PeekData) {
+  uint8_t buffer[] = {0x01, 0x02, 0x03, 0x04};
+  DataExtractor E(buffer, sizeof buffer, lldb::eByteOrderLittle, 4);
+
+  EXPECT_EQ(buffer + 0, E.PeekData(0, 0));
+  EXPECT_EQ(buffer + 0, E.PeekData(0, 4));
+  EXPECT_EQ(nullptr, E.PeekData(0, 5));
+
+  EXPECT_EQ(buffer + 2, E.PeekData(2, 0));
+  EXPECT_EQ(buffer + 2, E.PeekData(2, 2));
+  EXPECT_EQ(nullptr, E.PeekData(2, 3));
+
+  EXPECT_EQ(buffer + 4, E.PeekData(4, 0));
+  EXPECT_EQ(nullptr, E.PeekData(4, 1));
+}
+
+TEST(DataExtractorTest, GetMaxU64) {
+  uint8_t buffer[] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
+  DataExtractor LE(buffer, sizeof(buffer), lldb::eByteOrderLittle,
+                   sizeof(void *));
+  DataExtractor BE(buffer, sizeof(buffer), lldb::eByteOrderBig, sizeof(void *));
+
+  lldb::offset_t offset;
+
+  // Check with the minimum allowed byte size.
+  offset = 0;
+  EXPECT_EQ(0x01U, LE.GetMaxU64(&offset, 1));
+  EXPECT_EQ(1U, offset);
+  offset = 0;
+  EXPECT_EQ(0x01U, BE.GetMaxU64(&offset, 1));
+  EXPECT_EQ(1U, offset);
+
+  // Check with a non-zero offset.
+  offset = 1;
+  EXPECT_EQ(0x0302U, LE.GetMaxU64(&offset, 2));
+  EXPECT_EQ(3U, offset);
+  offset = 1;
+  EXPECT_EQ(0x0203U, BE.GetMaxU64(&offset, 2));
+  EXPECT_EQ(3U, offset);
+
+  // Check with the byte size not being a multiple of 2.
+  offset = 0;
+  EXPECT_EQ(0x07060504030201U, LE.GetMaxU64(&offset, 7));
+  EXPECT_EQ(7U, offset);
+  offset = 0;
+  EXPECT_EQ(0x01020304050607U, BE.GetMaxU64(&offset, 7));
+  EXPECT_EQ(7U, offset);
+
+  // Check with the maximum allowed byte size.
+  offset = 0;
+  EXPECT_EQ(0x0807060504030201U, LE.GetMaxU64(&offset, 8));
+  EXPECT_EQ(8U, offset);
+  offset = 0;
+  EXPECT_EQ(0x0102030405060708U, BE.GetMaxU64(&offset, 8));
+  EXPECT_EQ(8U, offset);
+}
+
+TEST(DataExtractorTest, GetMaxS64) {
+  uint8_t buffer[] = {0x01, 0x02, 0x83, 0x04, 0x05, 0x06, 0x07, 0x08};
+  DataExtractor LE(buffer, sizeof(buffer), lldb::eByteOrderLittle,
+                   sizeof(void *));
+  DataExtractor BE(buffer, sizeof(buffer), lldb::eByteOrderBig, sizeof(void *));
+
+  lldb::offset_t offset;
+
+  // Check with the minimum allowed byte size.
+  offset = 0;
+  EXPECT_EQ(0x01, LE.GetMaxS64(&offset, 1));
+  EXPECT_EQ(1U, offset);
+  offset = 0;
+  EXPECT_EQ(0x01, BE.GetMaxS64(&offset, 1));
+  EXPECT_EQ(1U, offset);
+
+  // Check that sign extension works correctly.
+  offset = 0;
+  int64_t value = LE.GetMaxS64(&offset, 3);
+  EXPECT_EQ(0xffffffffff830201U, *reinterpret_cast<uint64_t *>(&value));
+  EXPECT_EQ(3U, offset);
+  offset = 2;
+  value = BE.GetMaxS64(&offset, 3);
+  EXPECT_EQ(0xffffffffff830405U, *reinterpret_cast<uint64_t *>(&value));
+  EXPECT_EQ(5U, offset);
+
+  // Check with the maximum allowed byte size.
+  offset = 0;
+  EXPECT_EQ(0x0807060504830201, LE.GetMaxS64(&offset, 8));
+  EXPECT_EQ(8U, offset);
+  offset = 0;
+  EXPECT_EQ(0x0102830405060708, BE.GetMaxS64(&offset, 8));
+  EXPECT_EQ(8U, offset);
+}
+
+TEST(DataExtractorTest, GetMaxU64_unchecked) {
+  uint8_t buffer[] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
+  DataExtractor LE(buffer, sizeof(buffer), lldb::eByteOrderLittle,
+                   sizeof(void *));
+  DataExtractor BE(buffer, sizeof(buffer), lldb::eByteOrderBig, sizeof(void *));
+
+  lldb::offset_t offset;
+
+  // Check with the minimum allowed byte size.
+  offset = 0;
+  EXPECT_EQ(0x01U, LE.GetMaxU64_unchecked(&offset, 1));
+  EXPECT_EQ(1U, offset);
+  offset = 0;
+  EXPECT_EQ(0x01U, BE.GetMaxU64_unchecked(&offset, 1));
+  EXPECT_EQ(1U, offset);
+
+  // Check with a non-zero offset.
+  offset = 1;
+  EXPECT_EQ(0x0302U, LE.GetMaxU64_unchecked(&offset, 2));
+  EXPECT_EQ(3U, offset);
+  offset = 1;
+  EXPECT_EQ(0x0203U, BE.GetMaxU64_unchecked(&offset, 2));
+  EXPECT_EQ(3U, offset);
+
+  // Check with the byte size not being a multiple of 2.
+  offset = 0;
+  EXPECT_EQ(0x07060504030201U, LE.GetMaxU64_unchecked(&offset, 7));
+  EXPECT_EQ(7U, offset);
+  offset = 0;
+  EXPECT_EQ(0x01020304050607U, BE.GetMaxU64_unchecked(&offset, 7));
+  EXPECT_EQ(7U, offset);
+
+  // Check with the maximum allowed byte size.
+  offset = 0;
+  EXPECT_EQ(0x0807060504030201U, LE.GetMaxU64_unchecked(&offset, 8));
+  EXPECT_EQ(8U, offset);
+  offset = 0;
+  EXPECT_EQ(0x0102030405060708U, BE.GetMaxU64_unchecked(&offset, 8));
+  EXPECT_EQ(8U, offset);
+}