bruno updated this revision to Diff 152198.
bruno added a comment.

Address Volodymyr's comments


https://reviews.llvm.org/D47301

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticLexKinds.td
  lib/Lex/HeaderSearch.cpp
  test/Modules/Inputs/framework-public-includes-private/A.framework/Headers/A.h
  
test/Modules/Inputs/framework-public-includes-private/A.framework/Modules/module.modulemap
  
test/Modules/Inputs/framework-public-includes-private/A.framework/Modules/module.private.modulemap
  
test/Modules/Inputs/framework-public-includes-private/A.framework/PrivateHeaders/APriv.h
  
test/Modules/Inputs/framework-public-includes-private/A.framework/PrivateHeaders/APriv2.h
  test/Modules/Inputs/framework-public-includes-private/a.hmap.json
  test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.h
  
test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.modulemap
  
test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.private.modulemap
  test/Modules/Inputs/framework-public-includes-private/flat-header-path/ZPriv.h
  test/Modules/Inputs/framework-public-includes-private/z.hmap.json
  test/Modules/Inputs/framework-public-includes-private/z.yaml
  test/Modules/framework-public-includes-private.m

Index: test/Modules/framework-public-includes-private.m
===================================================================
--- /dev/null
+++ test/Modules/framework-public-includes-private.m
@@ -0,0 +1,37 @@
+// REQUIRES: shell
+
+// RUN: rm -rf %t
+// RUN: mkdir %t
+
+// RUN: hmaptool write %S/Inputs/framework-public-includes-private/a.hmap.json %t/a.hmap
+// RUN: hmaptool write %S/Inputs/framework-public-includes-private/z.hmap.json %t/z.hmap
+
+// RUN: sed -e "s:TEST_DIR:%S/Inputs/framework-public-includes-private:g" \
+// RUN:   %S/Inputs/framework-public-includes-private/z.yaml > %t/z.yaml
+
+// The output with and without modules should be the same, without modules first.
+// RUN: %clang_cc1 \
+// RUN:   -iquote %t/z.hmap -iquote %t/a.hmap -ivfsoverlay %t/z.yaml \
+// RUN:   -F%S/Inputs/framework-public-includes-private \
+// RUN:   -fsyntax-only %s -verify
+
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/cache \
+// RUN:   -iquote %t/z.hmap -iquote %t/a.hmap -ivfsoverlay %t/z.yaml \
+// RUN:   -F%S/Inputs/framework-public-includes-private \
+// RUN:   -fsyntax-only %s \
+// RUN:   2>%t/stderr
+
+// The same warnings show up when modules is on but -verify doesn't get it
+// because they only show up under the module A building context.
+// RUN: FileCheck --input-file=%t/stderr %s
+// CHECK: public framework header includes private framework header 'A/APriv.h'
+// CHECK: public framework header includes private framework header 'A/APriv2.h'
+// CHECK: public framework header includes private framework header 'Z/ZPriv.h'
+
+#import "A.h"
+
+int bar() { return foo(); }
+
+// expected-warning@Inputs/framework-public-includes-private/A.framework/Headers/A.h:2{{public framework header includes private framework header 'A/APriv.h'}}
+// expected-warning@Inputs/framework-public-includes-private/A.framework/Headers/A.h:3{{public framework header includes private framework header 'A/APriv2.h'}}
+// expected-warning@Inputs/framework-public-includes-private/flat-header-path/Z.h:1{{public framework header includes private framework header 'Z/ZPriv.h'}}
Index: test/Modules/Inputs/framework-public-includes-private/z.yaml
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/z.yaml
@@ -0,0 +1,45 @@
+{
+  'version': 0,
+  'case-sensitive': 'false',
+  'use-external-names' : 'false',
+  'roots': [
+    {
+      'type': 'directory',
+      'name': "TEST_DIR/Z.framework/Headers",
+      'contents': [
+        {
+          'type': 'file',
+          'name': "Z.h",
+          'external-contents': "TEST_DIR/flat-header-path/Z.h"
+        }
+      ]
+    },
+    {
+      'type': 'directory',
+      'name': "TEST_DIR/Z.framework/PrivateHeaders",
+      'contents': [
+        {
+          'type': 'file',
+          'name': "ZPriv.h",
+          'external-contents': "TEST_DIR/flat-header-path/ZPriv.h"
+        }
+      ]
+    },
+    {
+      'type': 'directory',
+      'name': "TEST_DIR/Z.framework/Modules",
+      'contents': [
+        {
+          'type': 'file',
+          'name': "module.modulemap",
+          'external-contents': "TEST_DIR/flat-header-path/Z.modulemap"
+        },
+        {
+          'type': 'file',
+          'name': "module.private.modulemap",
+          'external-contents': "TEST_DIR/flat-header-path/Z.private.modulemap"
+        }
+      ]
+    }
+  ]
+}
Index: test/Modules/Inputs/framework-public-includes-private/z.hmap.json
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/z.hmap.json
@@ -0,0 +1,7 @@
+
+{
+  "mappings" :
+    {
+     "ZPriv.h" : "Z/ZPriv.h"
+    }
+}
Index: test/Modules/Inputs/framework-public-includes-private/flat-header-path/ZPriv.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/flat-header-path/ZPriv.h
@@ -0,0 +1 @@
+// ZPriv.h
Index: test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.private.modulemap
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.private.modulemap
@@ -0,0 +1,3 @@
+framework module Z_Private {
+  header "ZPriv.h"
+}
Index: test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.modulemap
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.modulemap
@@ -0,0 +1,3 @@
+framework module Z {
+  header "Z.h"
+}
Index: test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/flat-header-path/Z.h
@@ -0,0 +1 @@
+#import "ZPriv.h"
Index: test/Modules/Inputs/framework-public-includes-private/a.hmap.json
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/a.hmap.json
@@ -0,0 +1,8 @@
+
+{
+  "mappings" :
+    {
+     "A.h" : "A/A.h",
+     "APriv2.h" : "A/APriv2.h"
+    }
+}
Index: test/Modules/Inputs/framework-public-includes-private/A.framework/PrivateHeaders/APriv2.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/A.framework/PrivateHeaders/APriv2.h
@@ -0,0 +1 @@
+// APriv.h
Index: test/Modules/Inputs/framework-public-includes-private/A.framework/PrivateHeaders/APriv.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/A.framework/PrivateHeaders/APriv.h
@@ -0,0 +1 @@
+// APriv.h
Index: test/Modules/Inputs/framework-public-includes-private/A.framework/Modules/module.private.modulemap
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/A.framework/Modules/module.private.modulemap
@@ -0,0 +1,3 @@
+framework module A_Private {
+  header "APriv.h"
+}
Index: test/Modules/Inputs/framework-public-includes-private/A.framework/Modules/module.modulemap
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/A.framework/Modules/module.modulemap
@@ -0,0 +1,4 @@
+
+framework module A {
+  header "A.h"
+}
Index: test/Modules/Inputs/framework-public-includes-private/A.framework/Headers/A.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/framework-public-includes-private/A.framework/Headers/A.h
@@ -0,0 +1,5 @@
+
+#include <A/APriv.h>
+#include "APriv2.h"
+#include <Z/Z.h>
+int foo();
Index: lib/Lex/HeaderSearch.cpp
===================================================================
--- lib/Lex/HeaderSearch.cpp
+++ lib/Lex/HeaderSearch.cpp
@@ -621,11 +621,12 @@
   return CopyStr;
 }
 
-static bool isFrameworkStylePath(StringRef Path,
+static bool isFrameworkStylePath(StringRef Path, bool &IsPrivateHeader,
                                  SmallVectorImpl<char> &FrameworkName) {
   using namespace llvm::sys;
   path::const_iterator I = path::begin(Path);
   path::const_iterator E = path::end(Path);
+  IsPrivateHeader = false;
 
   // Detect different types of framework style paths:
   //
@@ -637,12 +638,16 @@
   // and some other variations among these lines.
   int FoundComp = 0;
   while (I != E) {
+    if (*I == "Headers")
+      ++FoundComp;
     if (I->endswith(".framework")) {
       FrameworkName.append(I->begin(), I->end());
       ++FoundComp;
     }
-    if (*I == "Headers" || *I == "PrivateHeaders")
+    if (*I == "PrivateHeaders") {
       ++FoundComp;
+      IsPrivateHeader = true;
+    }
     ++I;
   }
 
@@ -654,11 +659,13 @@
                          StringRef Includer, StringRef IncludeFilename,
                          const FileEntry *IncludeFE, bool isAngled = false,
                          bool FoundByHeaderMap = false) {
+  bool IsIncluderPrivateHeader = false;
   SmallString<128> FromFramework, ToFramework;
-  if (!isFrameworkStylePath(Includer, FromFramework))
+  if (!isFrameworkStylePath(Includer, IsIncluderPrivateHeader, FromFramework))
     return;
-  bool IsIncludeeInFramework =
-      isFrameworkStylePath(IncludeFE->getName(), ToFramework);
+  bool IsIncludeePrivateHeader = false;
+  bool IsIncludeeInFramework = isFrameworkStylePath(
+      IncludeFE->getName(), IsIncludeePrivateHeader, ToFramework);
 
   if (!isAngled && !FoundByHeaderMap) {
     SmallString<128> NewInclude("<");
@@ -672,6 +679,14 @@
         << IncludeFilename
         << FixItHint::CreateReplacement(IncludeLoc, NewInclude);
   }
+
+  // Headers in Foo.framework/Headers should not include headers
+  // from Foo.framework/PrivateHeaders, since this violates public/private
+  // API boundaries and can cause modular dependency cycles.
+  if (!IsIncluderPrivateHeader && IsIncludeeInFramework &&
+      IsIncludeePrivateHeader && FromFramework == ToFramework)
+    Diags.Report(IncludeLoc, diag::warn_framework_include_private_from_public)
+        << IncludeFilename;
 }
 
 /// LookupFile - Given a "foo" or \<foo> reference, look up the indicated file,
Index: include/clang/Basic/DiagnosticLexKinds.td
===================================================================
--- include/clang/Basic/DiagnosticLexKinds.td
+++ include/clang/Basic/DiagnosticLexKinds.td
@@ -718,6 +718,9 @@
   "double-quoted include \"%0\" in framework header, "
   "expected angle-bracketed instead"
   >, InGroup<FrameworkHdrQuotedInclude>, DefaultIgnore;
+def warn_framework_include_private_from_public : Warning<
+  "public framework header includes private framework header '%0'"
+  >, InGroup<FrameworkIncludePrivateFromPublic>;
 
 def warn_auto_module_import : Warning<
   "treating #%select{include|import|include_next|__include_macros}0 as an "
Index: include/clang/Basic/DiagnosticGroups.td
===================================================================
--- include/clang/Basic/DiagnosticGroups.td
+++ include/clang/Basic/DiagnosticGroups.td
@@ -32,6 +32,8 @@
 def Section : DiagGroup<"section">;
 def AutoImport : DiagGroup<"auto-import">;
 def FrameworkHdrQuotedInclude : DiagGroup<"quoted-include-in-framework-header">;
+def FrameworkIncludePrivateFromPublic :
+  DiagGroup<"framework-include-private-from-public">;
 def CXX14BinaryLiteral : DiagGroup<"c++14-binary-literal">;
 def CXXPre14CompatBinaryLiteral : DiagGroup<"c++98-c++11-compat-binary-literal">;
 def GNUBinaryLiteral : DiagGroup<"gnu-binary-literal">;
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