[index] Index system ImportDecls even when there is a DeclarationsOnl…

…y filter

Whether we call an ImportDecl a decl or a reference symbol role is
somewhat academic, but in practice it's more like a declaration because
it is interesting even to consumers who wouldn't care about references.
Most importantly, we want to report the module dependencies of system
modules even when we have declaration-only filtering.

rdar://problem/27134855

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275454 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Index/IndexingContext.cpp

@@ -83,14 +83,14 @@ bool IndexingContext::importedModule(const ImportDecl *ImportD) {
   if (SEntry.getFile().getFileCharacteristic() != SrcMgr::C_User) {
     switch (IndexOpts.SystemSymbolFilter) {
     case IndexingOptions::SystemSymbolFilterKind::None:
-    case IndexingOptions::SystemSymbolFilterKind::DeclarationsOnly:
       return true;
+    case IndexingOptions::SystemSymbolFilterKind::DeclarationsOnly:
     case IndexingOptions::SystemSymbolFilterKind::All:
       break;
     }
   }
 
-  SymbolRoleSet Roles = (unsigned)SymbolRole::Reference;
+  SymbolRoleSet Roles = (unsigned)SymbolRole::Declaration;
   if (ImportD->isImplicit())
     Roles |= (unsigned)SymbolRole::Implicit;
 

test/Index/Core/index-with-module.m

@@ -1,12 +1,12 @@
 // RUN: rm -rf %t.mcp
 // RUN: c-index-test core -print-source-symbols -- %s -I %S/Inputs/module -fmodules -fmodules-cache-path=%t.mcp | FileCheck %s
 
-// CHECK: [[@LINE+1]]:9 | module/C | ModA | Ref |
+// CHECK: [[@LINE+1]]:9 | module/C | ModA | Decl |
 @import ModA;
-// CHECK: [[@LINE+1]]:1 | module/C | ModA | Ref,Impl |
+// CHECK: [[@LINE+1]]:1 | module/C | ModA | Decl,Impl |
 #include "ModA.h"
 
 void foo() {
   // CHECK: [[@LINE+1]]:3 | function/C | ModA_func | c:@F@ModA_func | {{.*}} | Ref,Call,RelCall | rel: 1
   ModA_func();
-}
+}

test/Index/index-module.m

@@ -6,6 +6,8 @@
 // RUN: rm -rf %t.cache
 // RUN: c-index-test -index-file %s -fmodules-cache-path=%t.cache -fmodules -F %S/../Modules/Inputs \
 // RUN:      -Xclang -fdisable-module-hash | FileCheck %s
+// RUN: c-index-test -index-file %s -fmodules-cache-path=%t.cache.sys -fmodules -iframework %S/../Modules/Inputs \
+// RUN:      -Xclang -fdisable-module-hash | FileCheck %s
 // RUN: c-index-test -index-file %s -fmodules-cache-path=%t.cache -fmodules -gmodules -F %S/../Modules/Inputs \
 // RUN:      -Xclang -fdisable-module-hash | FileCheck %s
 
@@ -18,6 +20,7 @@
 // CHECK-NOT: [indexDeclaration]
 
 // RUN: c-index-test -index-tu %t.cache/DependsOnModule.pcm | FileCheck %s -check-prefix=CHECK-DMOD
+// RUN: c-index-test -index-tu %t.cache.sys/DependsOnModule.pcm | FileCheck %s -check-prefix=CHECK-DMOD
 
 // CHECK-DMOD:      [startedTranslationUnit]
 // CHECK-DMOD-NEXT: [ppIncludedFile]: [[DMOD_MODULE_H:.*/Modules/Inputs/DependsOnModule\.framework[/\\]Headers[/\\]DependsOnModule\.h]] | {{.*}} | hash loc: <invalid> | {{.*}} | module: DependsOnModule
@@ -27,7 +30,8 @@
 // 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
-// CHECK-DMOD-NEXT: [importedASTFile]: {{.*}}.cache{{[/\\]}}Module.pcm | loc: [[DMOD_MODULE_H]]:1:1 | name: "Module" | isImplicit: 1
+// CHECK-DMOD-NEXT: [importedASTFile]: {{.*}}.cache{{(.sys)?[/\\]}}Module.pcm | loc: [[DMOD_MODULE_H]]:1:1 | name: "Module" | isImplicit: 1
+//
 // CHECK-DMOD-NEXT: [indexDeclaration]: kind: variable | name: depends_on_module_other | {{.*}} | loc: [[DMOD_OTHER_H]]:1:5
 // CHECK-DMOD-NEXT: [indexDeclaration]: kind: variable | name: template | {{.*}} | loc: [[DMOD_NOT_CXX_H]]:1:12
 // CHECK-DMOD-NEXT: [indexDeclaration]: kind: variable | name: sub_framework | {{.*}} | loc: [[DMOD_SUB_H]]:2:8