[ThinLTO] Parse module summary index from assembly

Summary:
Adds assembly parsing support for the module summary index (follow on
to r333335 which added the assembly writing support).

I added support to llvm-as to invoke the index parsing, so that it can
create either a bitcode file with a Module and a per-module index, or
a combined index without a Module.

I will send follow on patches soon to do the following:
- add support to tools such as llvm-lto2 to parse the per-module indexes
from assembly instead of bitcode when testing the thin link.
- verification support.

Depends on D47844 and D47842.

Reviewers: pcc, dexonsmith, mehdi_amini

Subscribers: inglorion, eraman, steven_wu, llvm-commits

Differential Revision: https://reviews.llvm.org/D47905

llvm-svn: 335602

1 files changed, 9 insertions, 3 deletions

diff --git a/llvm/test/Bitcode/thinlto-function-summary-callgraph-profile-summary.ll b/llvm/test/Bitcode/thinlto-function-summary-callgraph-profile-summary.ll
index 9eb63364fe3..fc3c5c90ab9 100644
--- a/llvm/test/Bitcode/thinlto-function-summary-callgraph-profile-summary.ll
+++ b/llvm/test/Bitcode/thinlto-function-summary-callgraph-profile-summary.ll
@@ -6,17 +6,23 @@
 
 ; Make sure the assembler doesn't error when parsing the summary
 ; RUN: llvm-as %t.o.ll
-; RUN: ls %t.o.bc
+
+; Check assembled summary.
+; RUN: llvm-dis %t.o.bc -o - | FileCheck %s --check-prefix=DIS
 
 ; RUN: opt -module-summary %p/Inputs/thinlto-function-summary-callgraph-profile-summary.ll -o %t2.o
 ; RUN: llvm-lto -thinlto -o %t3 %t.o %t2.o
 ; RUN: llvm-bcanalyzer -dump %t3.thinlto.bc | FileCheck %s --check-prefix=COMBINED
 ; RUN: llvm-dis %t3.thinlto.bc
 ; RUN: cat %t3.thinlto.ll | FileCheck %s --check-prefix=COMBINED-DIS
+; Round trip it through llvm-as
+; RUN: cat %t3.thinlto.ll | llvm-as -o - | llvm-dis -o - | FileCheck %s --check-prefix=COMBINED-DIS
 
 ; Make sure the assembler doesn't error when parsing the combined summary
 ; RUN: llvm-as %t3.thinlto.ll -o %t3.thinlto.o
-; RUN: ls %t3.thinlto.o
+
+; Check assembled combined summary.
+; RUN: llvm-dis %t3.thinlto.o -o - | FileCheck %s --check-prefix=COMBINED-DIS
 
 
 ; CHECK: <SOURCE_FILENAME
@@ -134,7 +140,7 @@ declare void @none3() #1
 !14 = !{i32 999999, i64 1, i32 2}
 !15 = !{!"branch_weights", i32 100}
 
-; DIS: ^0 = module: (path: "{{.*}}thinlto-function-summary-callgraph-profile-summary.ll.tmp.o", hash: (0, 0, 0, 0, 0))
+; DIS: ^0 = module: (path: "{{.*}}thinlto-function-summary-callgraph-profile-summary.ll.tmp.o{{.*}}", hash: (0, 0, 0, 0, 0))
 ; DIS: ^1 = gv: (guid: 123)
 ; DIS: ^2 = gv: (name: "none2") ; guid = 3741006263754194003
 ; DIS: ^3 = gv: (name: "hot3") ; guid = 5026609803865204483