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

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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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Francis Visoiu Mistrih
2019-07-30 23:11:57 +00:00
parent 2f158d66cf
commit 6038bea1b8
20 changed files with 1354 additions and 7 deletions
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test/Bitcode/stream-types.c
+3
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@@ -10,3 +10,6 @@
// RUN: not llvm-bcanalyzer -dump %s.ast.incomplete 2>&1 | FileCheck %s -check-prefix=CHECK-INCOMPLETE
// RUN: not llvm-bcanalyzer -dump %s.dia.incomplete 2>&1 | FileCheck %s -check-prefix=CHECK-INCOMPLETE
// CHECK-INCOMPLETE: Bitcode stream should be a multiple of 4 bytes in length
// RUN: llvm-bcanalyzer -dump %s.opt.bitstream | FileCheck %s -check-prefix=CHECK-REMARKS
// CHECK-REMARKS: Stream type: LLVM Remarks