[clang-doc] Reenable time trace support (#141139)

This patch re-enables -ftime-trace support in clang-doc. Initial support
in #97644 was reverted, and never relanded. This patch adds back the
command line option, and leverages the RAII tracing infrastructure more
thoroughly.

1 files changed, 8 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-doc/BitcodeReader.cpp b/clang-tools-extra/clang-doc/BitcodeReader.cpp
index f8e338eb7..546dd02 100644
--- a/clang-tools-extra/clang-doc/BitcodeReader.cpp
+++ b/clang-tools-extra/clang-doc/BitcodeReader.cpp
@@ -9,6 +9,7 @@
 #include "BitcodeReader.h"
 #include "llvm/ADT/IndexedMap.h"
 #include "llvm/Support/Error.h"
+#include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/raw_ostream.h"
 #include <optional>
 
@@ -672,6 +673,7 @@ llvm::Error ClangDocBitcodeReader::readRecord(unsigned ID, T I) {
 
 template <>
 llvm::Error ClangDocBitcodeReader::readRecord(unsigned ID, Reference *I) {
+  llvm::TimeTraceScope("Reducing infos", "readRecord");
   Record R;
   llvm::StringRef Blob;
   llvm::Expected<unsigned> MaybeRecID = Stream.readRecord(ID, R, &Blob);
@@ -683,6 +685,7 @@ llvm::Error ClangDocBitcodeReader::readRecord(unsigned ID, Reference *I) {
 // Read a block of records into a single info.
 template <typename T>
 llvm::Error ClangDocBitcodeReader::readBlock(unsigned ID, T I) {
+  llvm::TimeTraceScope("Reducing infos", "readBlock");
   if (llvm::Error Err = Stream.EnterSubBlock(ID))
     return Err;
 
@@ -713,6 +716,7 @@ llvm::Error ClangDocBitcodeReader::readBlock(unsigned ID, T I) {
 
 template <typename T>
 llvm::Error ClangDocBitcodeReader::readSubBlock(unsigned ID, T I) {
+  llvm::TimeTraceScope("Reducing infos", "readSubBlock");
   switch (ID) {
   // Blocks can only have certain types of sub blocks.
   case BI_COMMENT_BLOCK_ID: {
@@ -819,6 +823,7 @@ llvm::Error ClangDocBitcodeReader::readSubBlock(unsigned ID, T I) {
 
 ClangDocBitcodeReader::Cursor
 ClangDocBitcodeReader::skipUntilRecordOrBlock(unsigned &BlockOrRecordID) {
+  llvm::TimeTraceScope("Reducing infos", "skipUntilRecordOrBlock");
   BlockOrRecordID = 0;
 
   while (!Stream.AtEndOfStream()) {
@@ -880,6 +885,7 @@ llvm::Error ClangDocBitcodeReader::validateStream() {
 }
 
 llvm::Error ClangDocBitcodeReader::readBlockInfoBlock() {
+  llvm::TimeTraceScope("Reducing infos", "readBlockInfoBlock");
   Expected<std::optional<llvm::BitstreamBlockInfo>> MaybeBlockInfo =
       Stream.ReadBlockInfoBlock();
   if (!MaybeBlockInfo)
@@ -895,6 +901,7 @@ llvm::Error ClangDocBitcodeReader::readBlockInfoBlock() {
 template <typename T>
 llvm::Expected<std::unique_ptr<Info>>
 ClangDocBitcodeReader::createInfo(unsigned ID) {
+  llvm::TimeTraceScope("Reducing infos", "createInfo");
   std::unique_ptr<Info> I = std::make_unique<T>();
   if (auto Err = readBlock(ID, static_cast<T *>(I.get())))
     return std::move(Err);
@@ -903,6 +910,7 @@ ClangDocBitcodeReader::createInfo(unsigned ID) {
 
 llvm::Expected<std::unique_ptr<Info>>
 ClangDocBitcodeReader::readBlockToInfo(unsigned ID) {
+  llvm::TimeTraceScope("Reducing infos", "readBlockToInfo");
   switch (ID) {
   case BI_NAMESPACE_BLOCK_ID:
     return createInfo<NamespaceInfo>(ID);