[coroutines] Support "coroutines" feature in module map requires clause

Summary: In order for libc++ to add `<experimental/coroutine>` to its module map, there has to be a feature that can be used to detect if coroutines support is enabled in Clang. 

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D33538

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@304107 91177308-0d34-0410-b5e6-96231b3b80d8

docs/Modules.rst

@@ -413,6 +413,9 @@ altivec
 blocks
   The "blocks" language feature is available.
 
+coroutines
+  Support for the coroutines TS is available.
+
 cplusplus
   C++ support is available.
 

lib/Basic/Module.cpp

@@ -64,6 +64,7 @@ static bool hasFeature(StringRef Feature, const LangOptions &LangOpts,
   bool HasFeature = llvm::StringSwitch<bool>(Feature)
                         .Case("altivec", LangOpts.AltiVec)
                         .Case("blocks", LangOpts.Blocks)
+                        .Case("coroutines", LangOpts.CoroutinesTS)
                         .Case("cplusplus", LangOpts.CPlusPlus)
                         .Case("cplusplus11", LangOpts.CPlusPlus11)
                         .Case("freestanding", LangOpts.Freestanding)

test/Index/index-module.m

@@ -27,6 +27,7 @@ int glob;
 // CHECK-DMOD-NEXT: [ppIncludedFile]: {{.*}}/Modules/Inputs/Module.framework{{[/\\]}}Headers{{[/\\]}}Module.h | name: "Module/Module.h" | hash loc: {{.*}}/Modules/Inputs/DependsOnModule.framework{{[/\\]}}Headers{{[/\\]}}DependsOnModule.h:1:1 | isImport: 0 | isAngled: 1 | isModule: 1 | module: Module
 // CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_OTHER_H:.*/Modules/Inputs/DependsOnModule\.framework[/\\]Headers[/\\]other\.h]] | {{.*}} | hash loc: <invalid> | {{.*}} | module: DependsOnModule
 // CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_NOT_CXX_H:.*/Modules/Inputs/DependsOnModule\.framework[/\\]Headers[/\\]not_cxx\.h]] | {{.*}} | hash loc: <invalid> | {{.*}} | module: DependsOnModule.NotCXX
+// CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_NOT_CORO_H:.*/Modules/Inputs/DependsOnModule\.framework[/\\]Headers[/\\]not_coroutines\.h]] | {{.*}} | hash loc: <invalid> | {{.*}} | module: DependsOnModule.NotCoroutines
 // CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_SUB_H:.*/Modules/Inputs/DependsOnModule\.framework[/\\]Frameworks[/\\]SubFramework\.framework[/\\]Headers[/\\]SubFramework\.h]] | {{.*}} | hash loc: <invalid> | {{.*}} | module: DependsOnModule.SubFramework
 // CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_SUB_OTHER_H:.*/Modules/Inputs/DependsOnModule.framework[/\\]Frameworks[/\\]SubFramework\.framework[/\\]Headers[/\\]Other\.h]] | name: "SubFramework/Other.h" | hash loc: [[DMOD_SUB_H]]:1:1 | isImport: 0 | isAngled: 0 | isModule: 0 | module: DependsOnModule.SubFramework.Other
 // CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_PRIVATE_H:.*/Modules/Inputs/DependsOnModule.framework[/\\]PrivateHeaders[/\\]DependsOnModulePrivate.h]] | {{.*}} | hash loc: <invalid> | {{.*}} | module: DependsOnModule.Private.DependsOnModule

test/Modules/Inputs/DependsOnModule.framework/Headers/coroutines.h

@@ -0,0 +1,3 @@
+#ifndef __cpp_coroutines
+#error coroutines must be enabled
+#endif

test/Modules/Inputs/DependsOnModule.framework/Headers/not_coroutines.h

@@ -0,0 +1,3 @@
+#ifdef __cpp_coroutines
+#error coroutines must NOT be enabled
+#endif

test/Modules/Inputs/DependsOnModule.framework/module.map

@@ -22,7 +22,14 @@ framework module DependsOnModule {
   explicit module CustomReq2 {
     requires custom_req2
   }
-
+  explicit module Coroutines {
+    requires coroutines
+    header "coroutines.h"
+  }
+  explicit module NotCoroutines {
+    requires !coroutines
+    header "not_coroutines.h"
+  }
   explicit framework module SubFramework {
     umbrella header "SubFramework.h"
 

test/Modules/requires-coroutines.mm

@@ -0,0 +1,12 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -Wauto-import -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -F %S/Inputs %s -verify
+// RUN: %clang_cc1 -Wauto-import -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -F %S/Inputs %s -verify -fcoroutines-ts -DCOROUTINES
+
+
+#ifdef COROUTINES
+@import DependsOnModule.Coroutines;
+@import DependsOnModule.NotCoroutines; // expected-error {{module 'DependsOnModule.NotCoroutines' is incompatible with feature 'coroutines'}}
+#else
+@import DependsOnModule.NotCoroutines;
+@import DependsOnModule.Coroutines; // expected-error {{module 'DependsOnModule.Coroutines' requires feature 'coroutines'}}
+#endif