From 2d5487cf446f9a58f6d2f76df33102423c83f285 Mon Sep 17 00:00:00 2001
From: Teresa Johnson <tejohnson@google.com>
Date: Mon, 11 Apr 2016 13:58:45 +0000
Subject: [ThinLTO] Move summary computation from BitcodeWriter to new pass

Summary:
This is the first step in also serializing the index out to LLVM
assembly.

The per-module summary written to bitcode is moved out of the bitcode
writer and to a new analysis pass (ModuleSummaryIndexWrapperPass).
The pass itself uses a new builder class to compute index, and the
builder class is used directly in places where we don't have a pass
manager (e.g. llvm-as).

Because we are computing summaries outside of the bitcode writer, we no
longer can use value ids created by the bitcode writer's
ValueEnumerator. This required changing the reference graph edge type
to use a new ValueInfo class holding a union between a GUID (combined
index) and Value* (permodule index). The Value* are converted to the
appropriate value ID during bitcode writing.

Also, this enables removal of the BitWriter library's dependence on the
Analysis library that was previously required for the summary computation.

Reviewers: joker.eph

Subscribers: joker.eph, llvm-commits

Differential Revision: http://reviews.llvm.org/D18763

llvm-svn: 265941
---
 llvm/lib/Analysis/Analysis.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/Analysis/Analysis.cpp')

diff --git a/llvm/lib/Analysis/Analysis.cpp b/llvm/lib/Analysis/Analysis.cpp
index 77d89dcd7b5..63292b2464a 100644
--- a/llvm/lib/Analysis/Analysis.cpp
+++ b/llvm/lib/Analysis/Analysis.cpp
@@ -60,6 +60,7 @@ void llvm::initializeAnalysis(PassRegistry &Registry) {
   initializeMemDerefPrinterPass(Registry);
   initializeMemoryDependenceWrapperPassPass(Registry);
   initializeModuleDebugInfoPrinterPass(Registry);
+  initializeModuleSummaryIndexWrapperPassPass(Registry);
   initializeObjCARCAAWrapperPassPass(Registry);
   initializePostDominatorTreeWrapperPassPass(Registry);
   initializeRegionInfoPassPass(Registry);
-- 
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