[Remarks] Add an LLVM-bitstream-based remark serializer

Add a new serializer, using a binary format based on the LLVM bitstream
format.

This format provides a way to serialize the remarks in two modes:

1) Separate mode: the metadata is separate from the remark entries.
2) Standalone mode: the metadata and the remark entries are in the same
file.

The format contains:

* a meta block: container version, container type, string table,
external file path, remark version
* a remark block: type, remark name, pass name, function name, debug
file, debug line, debug column, hotness, arguments (key, value, debug
file, debug line, debug column)

A string table is required for this format, which will be dumped in the
meta block to be consumed before parsing the remark blocks.

On clang itself, we noticed a size reduction of 13.4x compared to YAML,
and a compile-time reduction of between 1.7% and 3.5% on CTMark.

Differential Revision: https://reviews.llvm.org/D63466

llvm-svn: 367364

1 files changed, 341 insertions, 0 deletions

diff --git a/llvm/unittests/Remarks/BitstreamRemarksSerializerTest.cpp b/llvm/unittests/Remarks/BitstreamRemarksSerializerTest.cpp
new file mode 100644
index 00000000000..4c6bf7f3292
--- /dev/null
+++ b/llvm/unittests/Remarks/BitstreamRemarksSerializerTest.cpp
@@ -0,0 +1,341 @@
+//===- unittest/Support/BitstreamRemarksSerializerTest.cpp ----------------===//
+//
+// 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/Bitcode/BitcodeAnalyzer.h"
+#include "llvm/Remarks/BitstreamRemarkSerializer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "gtest/gtest.h"
+#include <string>
+
+// We need to supprt Windows paths as well. In order to have paths with the same
+// length, use a different path according to the platform.
+#ifdef _WIN32
+#define EXTERNALFILETESTPATH "C:/externalfi"
+#else
+#define EXTERNALFILETESTPATH "/externalfile"
+#endif
+
+using namespace llvm;
+
+static void checkAnalyze(StringRef Input, StringRef Expected) {
+  std::string OutputBuf;
+  raw_string_ostream OutputOS(OutputBuf);
+  BCDumpOptions O(OutputOS);
+  O.ShowBinaryBlobs = true;
+  BitcodeAnalyzer BA(Input);
+  EXPECT_FALSE(BA.analyze(O)); // Expect no errors.
+  EXPECT_EQ(OutputOS.str(), Expected);
+}
+
+static void check(remarks::SerializerMode Mode, const remarks::Remark &R,
+                  StringRef ExpectedR, Optional<StringRef> ExpectedMeta,
+                  Optional<remarks::StringTable> StrTab) {
+  // Emit the remark.
+  std::string InputBuf;
+  raw_string_ostream InputOS(InputBuf);
+  Expected<std::unique_ptr<remarks::RemarkSerializer>> MaybeSerializer = [&] {
+    if (StrTab)
+      return createRemarkSerializer(remarks::Format::Bitstream, Mode, InputOS,
+                                    std::move(*StrTab));
+    else
+      return createRemarkSerializer(remarks::Format::Bitstream, Mode, InputOS);
+  }();
+  EXPECT_FALSE(errorToBool(MaybeSerializer.takeError()));
+  std::unique_ptr<remarks::RemarkSerializer> Serializer =
+      std::move(*MaybeSerializer);
+  Serializer->emit(R);
+
+  // Analyze the serialized remark.
+  checkAnalyze(InputOS.str(), ExpectedR);
+
+  // Analyze the serialized metadata if it's not in standalone mode.
+  if (ExpectedMeta) {
+    std::string MetaBuf;
+    raw_string_ostream MetaOS(MetaBuf);
+    std::unique_ptr<remarks::MetaSerializer> MetaSerializer =
+        Serializer->metaSerializer(MetaOS, StringRef(EXTERNALFILETESTPATH));
+    MetaSerializer->emit();
+    checkAnalyze(MetaOS.str(), *ExpectedMeta);
+  }
+}
+
+static void check(const remarks::Remark &R, StringRef ExpectedR,
+                  StringRef ExpectedMeta,
+                  Optional<remarks::StringTable> StrTab = None) {
+  return check(remarks::SerializerMode::Separate, R, ExpectedR, ExpectedMeta,
+               std::move(StrTab));
+}
+
+static void checkStandalone(const remarks::Remark &R, StringRef ExpectedR,
+                            Optional<remarks::StringTable> StrTab = None) {
+  return check(remarks::SerializerMode::Standalone, R, ExpectedR,
+               /*ExpectedMeta=*/None, std::move(StrTab));
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileNoOptionals) {
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=1 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=0 op2=1 op3=2/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=14 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'remark\\x00pass\\x00function\\x00'\n"
+        "  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n");
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileNoOptionalsSeparateStrTab) {
+  remarks::StringTable StrTab;
+  StrTab.add("function");
+  StrTab.add("pass");
+  StrTab.add("remark");
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=1 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=2 op2=1 op3=0/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=14 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'function\\x00pass\\x00remark\\x00'\n"
+        "  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n",
+        std::move(StrTab));
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileDebugLoc) {
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  R.Loc.emplace();
+  R.Loc->SourceFilePath = "path";
+  R.Loc->SourceLine = 99;
+  R.Loc->SourceColumn = 55;
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=4 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=0 op2=1 op3=2/>\n"
+        "  <Remark debug location codeid=6 abbrevid=5 op0=3 op1=99 op2=55/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=15 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'remark\\x00pass\\x00function\\x00path\\x00'\n"
+        "  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n");
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileHotness) {
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  R.Hotness.emplace(999999999);
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=3 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=0 op2=1 op3=2/>\n"
+        "  <Remark hotness codeid=7 abbrevid=6 op0=999999999/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=14 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'remark\\x00pass\\x00function\\x00'\n"
+        "  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n");
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileArgNoDebugLoc) {
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  R.Args.emplace_back();
+  R.Args.back().Key = "key";
+  R.Args.back().Val = "value";
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=2 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=0 op2=1 op3=2/>\n"
+        "  <Argument codeid=9 abbrevid=8 op0=3 op1=4/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=16 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'remark\\x00pass\\x00function\\x00key\\x00value\\x00'\n"
+        "  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n");
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileArgDebugLoc) {
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  R.Args.emplace_back();
+  R.Args.back().Key = "key";
+  R.Args.back().Val = "value";
+  R.Args.back().Loc.emplace();
+  R.Args.back().Loc->SourceFilePath = "path";
+  R.Args.back().Loc->SourceLine = 99;
+  R.Args.back().Loc->SourceColumn = 55;
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=4 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=0 op2=1 op3=2/>\n"
+        "  <Argument with debug location codeid=8 abbrevid=7 op0=3 op1=4 op2=5 "
+        "op3=99 op4=55/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=17 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'remark\\x00pass\\x00function\\x00key\\x00value\\x00path\\x00'\n"
+        "  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n");
+}
+
+TEST(BitstreamRemarkSerializer, SeparateRemarkFileAll) {
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  R.Loc.emplace();
+  R.Loc->SourceFilePath = "path";
+  R.Loc->SourceLine = 99;
+  R.Loc->SourceColumn = 55;
+  R.Hotness.emplace(999999999);
+  R.Args.emplace_back();
+  R.Args.back().Key = "key";
+  R.Args.back().Val = "value";
+  R.Args.back().Loc.emplace();
+  R.Args.back().Loc->SourceFilePath = "argpath";
+  R.Args.back().Loc->SourceLine = 11;
+  R.Args.back().Loc->SourceColumn = 66;
+  check(R,
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=3 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=1/>\n"
+        "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+        "</Meta>\n"
+        "<Remark BlockID=9 NumWords=8 BlockCodeSize=4>\n"
+        "  <Remark header codeid=5 abbrevid=4 op0=2 op1=0 op2=1 op3=2/>\n"
+        "  <Remark debug location codeid=6 abbrevid=5 op0=3 op1=99 op2=55/>\n"
+        "  <Remark hotness codeid=7 abbrevid=6 op0=999999999/>\n"
+        "  <Argument with debug location codeid=8 abbrevid=7 op0=4 op1=5 op2=6 "
+        "op3=11 op4=66/>\n"
+        "</Remark>\n",
+        "<BLOCKINFO_BLOCK/>\n"
+        "<Meta BlockID=8 NumWords=19 BlockCodeSize=3>\n"
+        "  <Container info codeid=1 abbrevid=4 op0=0 op1=0/>\n"
+        "  <String table codeid=3 abbrevid=5/> blob data = "
+        "'remark\\x00pass\\x00function\\x00path\\x00key\\x00value\\x00argpa"
+        "th\\x00'\n  <External File codeid=4 abbrevid=6/> blob data = "
+        "'" EXTERNALFILETESTPATH"'\n"
+        "</Meta>\n");
+}
+
+TEST(BitstreamRemarkSerializer, Standalone) {
+  // Pre-populate the string table.
+  remarks::StringTable StrTab;
+  StrTab.add("pass");
+  StrTab.add("remark");
+  StrTab.add("function");
+  StrTab.add("path");
+  StrTab.add("key");
+  StrTab.add("value");
+  StrTab.add("argpath");
+  remarks::Remark R;
+  R.RemarkType = remarks::Type::Missed;
+  R.PassName = "pass";
+  R.RemarkName = "remark";
+  R.FunctionName = "function";
+  R.Loc.emplace();
+  R.Loc->SourceFilePath = "path";
+  R.Loc->SourceLine = 99;
+  R.Loc->SourceColumn = 55;
+  R.Hotness.emplace(999999999);
+  R.Args.emplace_back();
+  R.Args.back().Key = "key";
+  R.Args.back().Val = "value";
+  R.Args.back().Loc.emplace();
+  R.Args.back().Loc->SourceFilePath = "argpath";
+  R.Args.back().Loc->SourceLine = 11;
+  R.Args.back().Loc->SourceColumn = 66;
+  checkStandalone(
+      R,
+      "<BLOCKINFO_BLOCK/>\n"
+      "<Meta BlockID=8 NumWords=15 BlockCodeSize=3>\n"
+      "  <Container info codeid=1 abbrevid=4 op0=0 op1=2/>\n"
+      "  <Remark version codeid=2 abbrevid=5 op0=0/>\n"
+      "  <String table codeid=3 abbrevid=6/> blob data = "
+      "'pass\\x00remark\\x00function\\x00path\\x00key\\x00value\\x00argpath\\x0"
+      "0'\n"
+      "</Meta>\n"
+      "<Remark BlockID=9 NumWords=8 BlockCodeSize=4>\n"
+      "  <Remark header codeid=5 abbrevid=4 op0=2 op1=1 op2=0 op3=2/>\n"
+      "  <Remark debug location codeid=6 abbrevid=5 op0=3 op1=99 op2=55/>\n"
+      "  <Remark hotness codeid=7 abbrevid=6 op0=999999999/>\n"
+      "  <Argument with debug location codeid=8 abbrevid=7 op0=4 op1=5 op2=6 "
+      "op3=11 op4=66/>\n"
+      "</Remark>\n",
+      std::move(StrTab));
+}