[Modules] Support #import when entering files with modules

Textual headers and builtins that are #import'd from different
modules should get re-entered when these modules are independent
from each other.

Differential Revision: https://reviews.llvm.org/D26267

rdar://problem/25881934

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291644 91177308-0d34-0410-b5e6-96231b3b80d8

20 files changed, 131 insertions, 1 deletions

diff --git a/test/Modules/Inputs/import-textual/M/A/A.h b/test/Modules/Inputs/import-textual/M/A/A.h
new file mode 100644
index 0000000000..ebe4979d7c
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M/A/A.h
@@ -0,0 +1,4 @@
+
+#import "someheader.h"
+
+typedef myint aint;
diff --git a/test/Modules/Inputs/import-textual/M/B/B.h b/test/Modules/Inputs/import-textual/M/B/B.h
new file mode 100644
index 0000000000..ba85071c01
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M/B/B.h
@@ -0,0 +1,4 @@
+
+#import "someheader.h"
+
+typedef myint bint;
diff --git a/test/Modules/Inputs/import-textual/M/module.modulemap b/test/Modules/Inputs/import-textual/M/module.modulemap
new file mode 100644
index 0000000000..f80194876c
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M/module.modulemap
@@ -0,0 +1,17 @@
+
+module M {
+
+  module A {
+    header "A/A.h"
+    textual header "someheader.h"
+    export *
+  }
+
+  module B {
+    header "B/B.h"
+    textual header "someheader.h"
+    export *
+  }
+
+  export *
+}
diff --git a/test/Modules/Inputs/import-textual/M/someheader.h b/test/Modules/Inputs/import-textual/M/someheader.h
new file mode 100644
index 0000000000..16fae40872
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M/someheader.h
@@ -0,0 +1,6 @@
+#ifndef C_GUARD
+#define C_GUARD
+
+typedef int myint;
+
+#endif
diff --git a/test/Modules/Inputs/import-textual/M2/A/A.h b/test/Modules/Inputs/import-textual/M2/A/A.h
new file mode 100644
index 0000000000..ebe4979d7c
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M2/A/A.h
@@ -0,0 +1,4 @@
+
+#import "someheader.h"
+
+typedef myint aint;
diff --git a/test/Modules/Inputs/import-textual/M2/B/B.h b/test/Modules/Inputs/import-textual/M2/B/B.h
new file mode 100644
index 0000000000..ba85071c01
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M2/B/B.h
@@ -0,0 +1,4 @@
+
+#import "someheader.h"
+
+typedef myint bint;
diff --git a/test/Modules/Inputs/import-textual/M2/module.modulemap b/test/Modules/Inputs/import-textual/M2/module.modulemap
new file mode 100644
index 0000000000..f80194876c
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M2/module.modulemap
@@ -0,0 +1,17 @@
+
+module M {
+
+  module A {
+    header "A/A.h"
+    textual header "someheader.h"
+    export *
+  }
+
+  module B {
+    header "B/B.h"
+    textual header "someheader.h"
+    export *
+  }
+
+  export *
+}
diff --git a/test/Modules/Inputs/import-textual/M2/someheader.h b/test/Modules/Inputs/import-textual/M2/someheader.h
new file mode 100644
index 0000000000..df2009a019
--- /dev/null
+++ b/test/Modules/Inputs/import-textual/M2/someheader.h
@@ -0,0 +1 @@
+typedef int myint;
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/cstddef b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/cstddef
new file mode 100644
index 0000000000..4898c05fdb
--- /dev/null
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/cstddef
@@ -0,0 +1,9 @@
+#ifndef _LIBCPP_CSTDDEF
+#define _LIBCPP_CSTDDEF
+
+#include <stddef.h>
+#include <type_traits>
+
+typedef ptrdiff_t my_ptrdiff_t;
+
+#endif
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/math.h b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/math.h
index f761b910f3..9e2b693612 100644
--- a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/math.h
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/math.h
@@ -4,4 +4,6 @@
 #include_next <math.h>
 template<typename T> T abs(T t) { return (t < 0) ? -t : t; }
 
+#include <type_traits>
+
 #endif
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/module.modulemap b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/module.modulemap
index b06142a61a..f57c11c423 100644
--- a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/module.modulemap
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/module.modulemap
@@ -6,5 +6,7 @@ module "libc++" {
   // FIXME: remove "textual" from stdint module below once the issue
   // between umbrella headers and builtins is resolved.
   module stdint { textual header "stdint.h" export * }
+  module type_traits { header "type_traits" export * }
+  module cstddef { header "cstddef" export * }
   module __config { header "__config" export * }
 }
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/stddef.h b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/stddef.h
index bd42008e16..14167cfe1d 100644
--- a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/stddef.h
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/stddef.h
@@ -2,5 +2,6 @@
 #define LIBCXX_STDDEF_H
 
 #include <__config>
+#include_next <stddef.h>
 
 #endif
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/type_traits b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/type_traits
new file mode 100644
index 0000000000..a91056e008
--- /dev/null
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/c++/v1/type_traits
@@ -0,0 +1,6 @@
+#ifndef _LIBCPP_TYPE_TRAITS
+#define _LIBCPP_TYPE_TRAITS
+
+#include <cstddef>
+
+#endif
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/module.modulemap b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/module.modulemap
index 7244cb0987..25b9468d29 100644
--- a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/module.modulemap
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/module.modulemap
@@ -5,4 +5,12 @@ module libc [no_undeclared_includes] {
   module stdint { header "stdint.h" export * }
   module stdio { header "stdio.h" export * }
   module util { header "util.h" export * }
+  module POSIX {
+    module sys {
+      module types {
+        umbrella header "sys/_types/_types.h"
+        export *
+      }
+    }
+  }
 }
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/stddef.h b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/stddef.h
index eca72412a6..b98249f086 100644
--- a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/stddef.h
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/stddef.h
@@ -1 +1,6 @@
-// stddef.h
+#ifndef __STDDEF_H__
+#define __STDDEF_H__
+
+#include "sys/_types/_ptrdiff_t.h"
+
+#endif
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/sys/_types/_ptrdiff_t.h b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/sys/_types/_ptrdiff_t.h
new file mode 100644
index 0000000000..d14110e464
--- /dev/null
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/sys/_types/_ptrdiff_t.h
@@ -0,0 +1,4 @@
+#ifndef _PTRDIFF_T
+#define _PTRDIFF_T
+typedef int * ptrdiff_t;
+#endif /* _PTRDIFF_T */
diff --git a/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/sys/_types/_types.h b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/sys/_types/_types.h
new file mode 100644
index 0000000000..33d5e51443
--- /dev/null
+++ b/test/Modules/Inputs/libc-libcxx/sysroot/usr/include/sys/_types/_types.h
@@ -0,0 +1,6 @@
+#ifndef _SYS_TYPES_UMBRELLA
+#define _SYS_TYPES_UMBRELLA
+
+#include "_ptrdiff_t.h"
+
+#endif
diff --git a/test/Modules/builtin-import.mm b/test/Modules/builtin-import.mm
new file mode 100644
index 0000000000..2536ac51c4
--- /dev/null
+++ b/test/Modules/builtin-import.mm
@@ -0,0 +1,12 @@
+// REQUIRES: system-darwin
+
+// RUN: rm -rf %t
+// RUN: %clang -cc1 -fsyntax-only -nostdinc++ -isysroot %S/Inputs/libc-libcxx/sysroot -isystem %S/Inputs/libc-libcxx/sysroot/usr/include/c++/v1 -std=c++11 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -x objective-c++ -fmodules-local-submodule-visibility %s
+
+#include <stdio.h>
+#include <stddef.h>
+#include <cstddef>
+
+typedef ptrdiff_t try1_ptrdiff_t;
+typedef my_ptrdiff_t try2_ptrdiff_t;
+
diff --git a/test/Modules/import-textual-noguard.mm b/test/Modules/import-textual-noguard.mm
new file mode 100644
index 0000000000..dd124b6609
--- /dev/null
+++ b/test/Modules/import-textual-noguard.mm
@@ -0,0 +1,8 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -fmodules -fimplicit-module-maps -I%S/Inputs/import-textual/M2 -fmodules-cache-path=%t -x objective-c++ -fmodules-local-submodule-visibility %s -verify
+
+#include "A/A.h" // expected-error {{could not build module 'M'}}
+#include "B/B.h"
+
+typedef aint xxx;
+typedef bint yyy;
diff --git a/test/Modules/import-textual.mm b/test/Modules/import-textual.mm
new file mode 100644
index 0000000000..6593239d7f
--- /dev/null
+++ b/test/Modules/import-textual.mm
@@ -0,0 +1,10 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -fmodules -fimplicit-module-maps -I%S/Inputs/import-textual/M -fmodules-cache-path=%t -x objective-c++ -fmodules-local-submodule-visibility %s -verify
+
+// expected-no-diagnostics
+
+#include "A/A.h"
+#include "B/B.h"
+
+typedef aint xxx;
+typedef bint yyy;