[CodeCompletion] Complete platform names in @available expressions

rdar://32074504

llvm-svn: 302545

4 files changed, 43 insertions, 0 deletions

diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index b0cb34cf565..3a2195ba4d1 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -10009,6 +10009,7 @@ public:
                                              MacroInfo *MacroInfo,
                                              unsigned Argument);
   void CodeCompleteNaturalLanguage();
+  void CodeCompleteAvailabilityPlatformName();
   void GatherGlobalCodeCompletions(CodeCompletionAllocator &Allocator,
                                    CodeCompletionTUInfo &CCTUInfo,
                   SmallVectorImpl<CodeCompletionResult> &Results);
diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index 77316b9ad12..38c1b2676df 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -2989,6 +2989,11 @@ Optional<AvailabilitySpec> Parser::ParseAvailabilitySpec() {
     return AvailabilitySpec(ConsumeToken());
   } else {
     // Parse the platform name.
+    if (Tok.is(tok::code_completion)) {
+      Actions.CodeCompleteAvailabilityPlatformName();
+      cutOffParsing();
+      return None;
+    }
     if (Tok.isNot(tok::identifier)) {
       Diag(Tok, diag::err_avail_query_expected_platform_name);
       return None;
diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index cfac3f1dc1d..dba916e0b99 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -7811,6 +7811,23 @@ void Sema::CodeCompleteNaturalLanguage() {
                             nullptr, 0);
 }
 
+void Sema::CodeCompleteAvailabilityPlatformName() {
+  ResultBuilder Results(*this, CodeCompleter->getAllocator(),
+                        CodeCompleter->getCodeCompletionTUInfo(),
+                        CodeCompletionContext::CCC_Other);
+  Results.EnterNewScope();
+  static const char *Platforms[] = {"macOS", "iOS", "watchOS", "tvOS"};
+  for (const char *Platform : llvm::makeArrayRef(Platforms)) {
+    Results.AddResult(CodeCompletionResult(Platform));
+    Results.AddResult(CodeCompletionResult(Results.getAllocator().CopyString(
+        Twine(Platform) + "ApplicationExtension")));
+  }
+  Results.ExitScope();
+  HandleCodeCompleteResults(this, CodeCompleter,
+                            CodeCompletionContext::CCC_Other, Results.data(),
+                            Results.size());
+}
+
 void Sema::GatherGlobalCodeCompletions(CodeCompletionAllocator &Allocator,
                                        CodeCompletionTUInfo &CCTUInfo,
                  SmallVectorImpl<CodeCompletionResult> &Results) {
diff --git a/clang/test/Index/complete-available.m b/clang/test/Index/complete-available.m
new file mode 100644
index 00000000000..8267dbdddc5
--- /dev/null
+++ b/clang/test/Index/complete-available.m
@@ -0,0 +1,20 @@
+/* The run lines are below, because this test is line- and
+   column-number sensitive. */
+void atAvailable() {
+  if (@available(macOS 10.10, *)) {
+
+  }
+  if (__builtin_available(iOS 8, *)) {
+  }
+}
+
+// RUN: c-index-test -code-completion-at=%s:4:18 %s | FileCheck -check-prefix=CHECK %s
+// RUN: c-index-test -code-completion-at=%s:7:27 %s | FileCheck -check-prefix=CHECK %s
+// CHECK: {TypedText iOS} (40)
+// CHECK: {TypedText iOSApplicationExtension} (40)
+// CHECK: {TypedText macOS} (40)
+// CHECK: {TypedText macOSApplicationExtension} (40)
+// CHECK: {TypedText tvOS} (40)
+// CHECK: {TypedText tvOSApplicationExtension} (40)
+// CHECK: {TypedText watchOS} (40)
+// CHECK: {TypedText watchOSApplicationExtension} (40)