Add #pragma clang module build/endbuild pragmas for performing a module build

as part of a compilation.

This is intended for two purposes:

1) Writing self-contained test cases for modules: we can now write a single
source file test that builds some number of module files on the side and
imports them.

2) Debugging / test case reduction. A single-source testcase is much more
amenable to reduction, compared to a VFS tarball or .pcm files.

llvm-svn: 305101

4 files changed, 7 insertions, 80 deletions

diff --git a/clang/unittests/Basic/SourceManagerTest.cpp b/clang/unittests/Basic/SourceManagerTest.cpp
index aa15e16b851..8457d3b639f 100644
--- a/clang/unittests/Basic/SourceManagerTest.cpp
+++ b/clang/unittests/Basic/SourceManagerTest.cpp
@@ -51,24 +51,6 @@ protected:
   IntrusiveRefCntPtr<TargetInfo> Target;
 };
 
-class VoidModuleLoader : public ModuleLoader {
-  ModuleLoadResult loadModule(SourceLocation ImportLoc, 
-                              ModuleIdPath Path,
-                              Module::NameVisibilityKind Visibility,
-                              bool IsInclusionDirective) override {
-    return ModuleLoadResult();
-  }
-
-  void makeModuleVisible(Module *Mod,
-                         Module::NameVisibilityKind Visibility,
-                         SourceLocation ImportLoc) override { }
-
-  GlobalModuleIndex *loadGlobalModuleIndex(SourceLocation TriggerLoc) override
-    { return nullptr; }
-  bool lookupMissingImports(StringRef Name, SourceLocation TriggerLoc) override
-    { return 0; }
-};
-
 TEST_F(SourceManagerTest, isBeforeInTranslationUnit) {
   const char *source =
     "#define M(x) [x]\n"
@@ -78,7 +60,7 @@ TEST_F(SourceManagerTest, isBeforeInTranslationUnit) {
   FileID mainFileID = SourceMgr.createFileID(std::move(Buf));
   SourceMgr.setMainFileID(mainFileID);
 
-  VoidModuleLoader ModLoader;
+  TrivialModuleLoader ModLoader;
   MemoryBufferCache PCMCache;
   HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
                           Diags, LangOpts, &*Target);
@@ -199,7 +181,7 @@ TEST_F(SourceManagerTest, getMacroArgExpandedLocation) {
                                                  HeaderBuf->getBufferSize(), 0);
   SourceMgr.overrideFileContents(headerFile, std::move(HeaderBuf));
 
-  VoidModuleLoader ModLoader;
+  TrivialModuleLoader ModLoader;
   MemoryBufferCache PCMCache;
   HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
                           Diags, LangOpts, &*Target);
@@ -318,7 +300,7 @@ TEST_F(SourceManagerTest, isBeforeInTranslationUnitWithMacroInInclude) {
                                                  HeaderBuf->getBufferSize(), 0);
   SourceMgr.overrideFileContents(headerFile, std::move(HeaderBuf));
 
-  VoidModuleLoader ModLoader;
+  TrivialModuleLoader ModLoader;
   MemoryBufferCache PCMCache;
   HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
                           Diags, LangOpts, &*Target);
diff --git a/clang/unittests/Lex/LexerTest.cpp b/clang/unittests/Lex/LexerTest.cpp
index b5a6fd90d08..e2507d3580d 100644
--- a/clang/unittests/Lex/LexerTest.cpp
+++ b/clang/unittests/Lex/LexerTest.cpp
@@ -27,24 +27,6 @@ using namespace clang;
 
 namespace {
 
-class VoidModuleLoader : public ModuleLoader {
-  ModuleLoadResult loadModule(SourceLocation ImportLoc, 
-                              ModuleIdPath Path,
-                              Module::NameVisibilityKind Visibility,
-                              bool IsInclusionDirective) override {
-    return ModuleLoadResult();
-  }
-
-  void makeModuleVisible(Module *Mod,
-                         Module::NameVisibilityKind Visibility,
-                         SourceLocation ImportLoc) override { }
-
-  GlobalModuleIndex *loadGlobalModuleIndex(SourceLocation TriggerLoc) override
-    { return nullptr; }
-  bool lookupMissingImports(StringRef Name, SourceLocation TriggerLoc) override
-    { return 0; }
-};
-
 // The test fixture.
 class LexerTest : public ::testing::Test {
 protected:
@@ -64,7 +46,7 @@ protected:
         llvm::MemoryBuffer::getMemBuffer(Source);
     SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(Buf)));
 
-    VoidModuleLoader ModLoader;
+    TrivialModuleLoader ModLoader;
     MemoryBufferCache PCMCache;
     HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
                             Diags, LangOpts, Target.get());
diff --git a/clang/unittests/Lex/PPCallbacksTest.cpp b/clang/unittests/Lex/PPCallbacksTest.cpp
index 0841791e086..67b56a601c7 100644
--- a/clang/unittests/Lex/PPCallbacksTest.cpp
+++ b/clang/unittests/Lex/PPCallbacksTest.cpp
@@ -32,25 +32,6 @@ using namespace clang;
 
 namespace {
 
-// Stub out module loading.
-class VoidModuleLoader : public ModuleLoader {
-  ModuleLoadResult loadModule(SourceLocation ImportLoc, 
-                              ModuleIdPath Path,
-                              Module::NameVisibilityKind Visibility,
-                              bool IsInclusionDirective) override {
-    return ModuleLoadResult();
-  }
-
-  void makeModuleVisible(Module *Mod,
-                         Module::NameVisibilityKind Visibility,
-                         SourceLocation ImportLoc) override { }
-
-  GlobalModuleIndex *loadGlobalModuleIndex(SourceLocation TriggerLoc) override
-    { return nullptr; }
-  bool lookupMissingImports(StringRef Name, SourceLocation TriggerLoc) override
-    { return 0; }
-};
-
 // Stub to collect data from InclusionDirective callbacks.
 class InclusionDirectiveCallbacks : public PPCallbacks {
 public:
@@ -161,7 +142,7 @@ protected:
         llvm::MemoryBuffer::getMemBuffer(SourceText);
     SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(Buf)));
 
-    VoidModuleLoader ModLoader;
+    TrivialModuleLoader ModLoader;
     MemoryBufferCache PCMCache;
 
     HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
@@ -199,7 +180,7 @@ protected:
         llvm::MemoryBuffer::getMemBuffer(SourceText, "test.cl");
     SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(SourceBuf)));
 
-    VoidModuleLoader ModLoader;
+    TrivialModuleLoader ModLoader;
     MemoryBufferCache PCMCache;
     HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
                             Diags, OpenCLLangOpts, Target.get());
diff --git a/clang/unittests/Lex/PPConditionalDirectiveRecordTest.cpp b/clang/unittests/Lex/PPConditionalDirectiveRecordTest.cpp
index b635604e098..f7b6f717a1d 100644
--- a/clang/unittests/Lex/PPConditionalDirectiveRecordTest.cpp
+++ b/clang/unittests/Lex/PPConditionalDirectiveRecordTest.cpp
@@ -51,24 +51,6 @@ protected:
   IntrusiveRefCntPtr<TargetInfo> Target;
 };
 
-class VoidModuleLoader : public ModuleLoader {
-  ModuleLoadResult loadModule(SourceLocation ImportLoc, 
-                              ModuleIdPath Path,
-                              Module::NameVisibilityKind Visibility,
-                              bool IsInclusionDirective) override {
-    return ModuleLoadResult();
-  }
-
-  void makeModuleVisible(Module *Mod,
-                         Module::NameVisibilityKind Visibility,
-                         SourceLocation ImportLoc) override { }
-
-  GlobalModuleIndex *loadGlobalModuleIndex(SourceLocation TriggerLoc) override
-    { return nullptr; }
-  bool lookupMissingImports(StringRef Name, SourceLocation TriggerLoc) override
-    { return 0; }
-};
-
 TEST_F(PPConditionalDirectiveRecordTest, PPRecAPI) {
   const char *source =
       "0 1\n"
@@ -93,7 +75,7 @@ TEST_F(PPConditionalDirectiveRecordTest, PPRecAPI) {
       llvm::MemoryBuffer::getMemBuffer(source);
   SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(Buf)));
 
-  VoidModuleLoader ModLoader;
+  TrivialModuleLoader ModLoader;
   MemoryBufferCache PCMCache;
   HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
                           Diags, LangOpts, Target.get());