Prototype of modules codegen

First pass at generating weak definitions of inline functions from module files
(& skipping (-O0) or emitting available_externally (optimizations)
definitions where those modules are used).

External functions defined in modules are emitted into the modular
object file as well (this may turn an existing ODR violation (if that
module were imported into multiple translations) into valid/linkable
code).

Internal symbols (static functions, for example) are not correctly
supported yet. The symbol will be produced, internal, in the modular
object - unreferenceable from the users.

Reviewers: rsmith

Differential Revision: https://reviews.llvm.org/D28845

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@293456 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 64 insertions, 0 deletions

diff --git a/test/Modules/codegen.test b/test/Modules/codegen.test
new file mode 100644
index 0000000000..538dfd87ae
--- /dev/null
+++ b/test/Modules/codegen.test
@@ -0,0 +1,64 @@
+RUN: rm -rf %t
+
+RUN: %clang_cc1 -fmodules-codegen -x c++ -fmodules -emit-module -fmodule-name=foo %S/Inputs/codegen/foo.modulemap -o %t/foo.pcm
+RUN: %clang_cc1 -fmodules-codegen -x c++ -fmodules -emit-module -fmodule-name=bar %S/Inputs/codegen/bar.modulemap -o %t/bar.pcm -fmodule-file=%t/foo.pcm
+
+RUN: %clang_cc1 -emit-llvm %t/foo.pcm -o - | FileCheck --check-prefix=FOO %s
+RUN: %clang_cc1 -emit-llvm %t/bar.pcm -o - -fmodule-file=%t/foo.pcm | FileCheck --check-prefix=BAR-CMN --check-prefix=BAR %s
+RUN: %clang_cc1 -fmodules -fmodule-file=%t/foo.pcm -fmodule-file=%t/bar.pcm %S/Inputs/codegen/use.cpp -emit-llvm -o - | FileCheck --check-prefix=USE-CMN --check-prefix=USE %s
+
+RUN: %clang_cc1 -O2 -disable-llvm-passes -emit-llvm %t/foo.pcm -o - | FileCheck --check-prefix=FOO %s
+RUN: %clang_cc1 -O2 -disable-llvm-passes -emit-llvm %t/bar.pcm -o - -fmodule-file=%t/foo.pcm | FileCheck --check-prefix=BAR-CMN --check-prefix=BAR-OPT %s
+RUN: %clang_cc1 -O2 -disable-llvm-passes -fmodules -fmodule-file=%t/foo.pcm -fmodule-file=%t/bar.pcm %S/Inputs/codegen/use.cpp -emit-llvm -o - | FileCheck --check-prefix=USE-CMN --check-prefix=USE-OPT %s
+
+FOO-NOT: comdat
+FOO: $_Z3foov = comdat any
+FOO: $_Z4foo2v = comdat any
+FOO: $_ZZ3foovE1i = comdat any
+FOO: @_ZZ3foovE1i = linkonce_odr global i32 0, comdat
+FOO-NOT: {{comdat|define|declare}}
+FOO: define void @_Z7foo_extv()
+FOO-NOT: {{define|declare}}
+FOO: define weak_odr void @_Z3foov() #{{[0-9]+}} comdat
+FOO-NOT: {{define|declare}}
+FOO: declare void @_Z2f1Ri(i32*
+FOO-NOT: {{define|declare}}
+
+FIXME: this internal function should be weak_odr, comdat, and with a new mangling
+FOO: define internal void @_ZL2f2v() #{{[0-9]+}}
+FOO-NOT: {{define|declare}}
+
+FOO: define weak_odr void @_Z4foo2v() #{{[0-9]+}} comdat
+FOO-NOT: {{define|declare}}
+
+
+BAR-CMN-NOT: comdat
+BAR-CMN: $_Z3barv = comdat any
+BAR-OPT: @_ZZ3foovE1i = linkonce_odr global i32 0, comdat
+BAR-CMN-NOT: {{comdat|define|declare}}
+BAR-CMN: define weak_odr void @_Z3barv() #{{[0-9]+}} comdat
+BAR-CMN-NOT: {{define|declare}}
+BAR: declare void @_Z3foov()
+Include all the available_externally definitions required for bar (foo -> f2)
+BAR-OPT: define available_externally void @_Z3foov()
+BAR-CMN-NOT: {{define|declare}}
+BAR-OPT: declare void @_Z2f1Ri(i32*
+BAR-OPT-NOT: {{define|declare}}
+BAR-OPT: define available_externally void @_ZL2f2v()
+BAR-OPT-NOT: {{define|declare}}
+
+
+USE-OPT: @_ZZ3foovE1i = linkonce_odr global i32 0, comdat
+USE-CMN-NOT: {{comdat|define|declare}}
+USE-CMN: define i32 @main()
+USE-CMN-NOT: {{define|declare}}
+USE: declare void @_Z3barv()
+Include all the available_externally definitions required for main (bar -> foo -> f2)
+USE-OPT: define available_externally void @_Z3barv()
+USE-CMN-NOT: {{define|declare}}
+USE-OPT: define available_externally void @_Z3foov()
+USE-OPT-NOT: {{define|declare}}
+USE-OPT: declare void @_Z2f1Ri(i32*
+USE-OPT-NOT: {{define|declare}}
+USE-OPT: define available_externally void @_ZL2f2v()
+USE-OPT-NOT: {{define|declare}}