From ccef33b45b61ff5586394997ebdde1001230a36d Mon Sep 17 00:00:00 2001
From: Mehdi Amini <mehdi.amini@apple.com>
Date: Sat, 8 Oct 2016 04:44:23 +0000
Subject: ThinLTO: don't perform incremental LTO on module without a hash

Clang always emit a hash for ThinLTO, but as other frontend are
starting to use ThinLTO, this could be a serious bug.

Differential Revision: https://reviews.llvm.org/D25379

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283655 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/ThinLTO/X86/cache.ll                   | 22 ++++++++++++++++++++++
 test/ThinLTO/X86/empty_module_with_cache.ll |  4 ++--
 2 files changed, 24 insertions(+), 2 deletions(-)

(limited to 'test/ThinLTO')

diff --git a/test/ThinLTO/X86/cache.ll b/test/ThinLTO/X86/cache.ll
index 239cfdf78dd7..b796b00fc5d5 100644
--- a/test/ThinLTO/X86/cache.ll
+++ b/test/ThinLTO/X86/cache.ll
@@ -1,6 +1,28 @@
+; Verify first that *without* hash, we don't use the cache.
+
 ; RUN: opt -module-summary %s -o %t.bc
 ; RUN: opt -module-summary %p/Inputs/cache.ll -o %t2.bc
 
+; Verify that enabling caching is ignoring module without hash
+; RUN: rm -Rf %t.cache && mkdir %t.cache
+; RUN: llvm-lto -thinlto-action=run -exported-symbol=globalfunc %t2.bc  %t.bc -thinlto-cache-dir %t.cache
+; RUN: ls %t.cache/llvmcache.timestamp
+; RUN: ls %t.cache | count 1
+
+; Verify that enabling caching is ignoring module without hash with llvm-lto2
+; RUN: rm -Rf %t.cache && mkdir %t.cache
+; RUN: llvm-lto2 -o %t.o %t2.bc  %t.bc -cache-dir %t.cache \
+; RUN:  -r=%t2.bc,_main,plx \
+; RUN:  -r=%t2.bc,_globalfunc,lx \
+; RUN:  -r=%t.bc,_globalfunc,plx
+; RUN: ls %t.cache | count 0
+
+
+; Repeat again, *with* hash this time.
+
+; RUN: opt -module-hash -module-summary %s -o %t.bc
+; RUN: opt -module-hash -module-summary %p/Inputs/cache.ll -o %t2.bc
+
 ; Verify that enabling caching is working
 ; RUN: rm -Rf %t.cache && mkdir %t.cache
 ; RUN: llvm-lto -thinlto-action=run -exported-symbol=globalfunc %t2.bc  %t.bc -thinlto-cache-dir %t.cache
diff --git a/test/ThinLTO/X86/empty_module_with_cache.ll b/test/ThinLTO/X86/empty_module_with_cache.ll
index c62745156302..3e16c395a893 100644
--- a/test/ThinLTO/X86/empty_module_with_cache.ll
+++ b/test/ThinLTO/X86/empty_module_with_cache.ll
@@ -22,13 +22,13 @@
 ; RUN: rm -Rf %t.cache && mkdir %t.cache
 ; RUN: llvm-lto -thinlto-action=run %t2.bc  %t.bc -exported-symbol=main -thinlto-cache-dir %t.cache
 ; RUN: ls %t.cache/llvmcache.timestamp
-; RUN: ls %t.cache | count 2
+; RUN: ls %t.cache | count 1
 
 ; Verify that caching is disabled for module without hash, with llvm-lto2
 ; RUN: rm -Rf %t.cache && mkdir %t.cache
 ; RUN: llvm-lto2 -o %t.o %t2.bc  %t.bc -cache-dir %t.cache \
 ; RUN:  -r=%t2.bc,_main,plx
-; RUN: ls %t.cache | count 1
+; RUN: ls %t.cache | count 0
 
 
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
-- 
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