Add a DIModule metadata node to the IR.

It is meant to be used to record modules @imported by the current
compile unit, so a debugger an import the same modules to replicate this
environment before dropping into the expression evaluator.

DIModule is a sibling to DINamespace and behaves quite similarly.
In addition to the name of the module it also records the module
configuration details that are necessary to uniquely identify the module.
This includes the configuration macros (e.g., -DNDEBUG), the include path
where the module.map file is to be found, and the isysroot.

The idea is that the backend will turn this into a DW_TAG_module.

http://reviews.llvm.org/D9614
rdar://problem/20965932

llvm-svn: 241017

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/unittests/IR/MetadataTest.cpp b/llvm/unittests/IR/MetadataTest.cpp
index c1da06814ca..b58615ce653 100644
--- a/llvm/unittests/IR/MetadataTest.cpp
+++ b/llvm/unittests/IR/MetadataTest.cpp
@@ -1704,6 +1704,40 @@ TEST_F(DINamespaceTest, get) {
   EXPECT_EQ(N, MDNode::replaceWithUniqued(std::move(Temp)));
 }
 
+typedef MetadataTest DIModuleTest;
+
+TEST_F(DIModuleTest, get) {
+  DIScope *Scope = getFile();
+  StringRef Name = "module";
+  StringRef ConfigMacro = "-DNDEBUG";
+  StringRef Includes = "-I.";
+  StringRef Sysroot = "/";
+
+  auto *N = DIModule::get(Context, Scope, Name, ConfigMacro, Includes, Sysroot);
+
+  EXPECT_EQ(dwarf::DW_TAG_module, N->getTag());
+  EXPECT_EQ(Scope, N->getScope());
+  EXPECT_EQ(Name, N->getName());
+  EXPECT_EQ(ConfigMacro, N->getConfigurationMacros());
+  EXPECT_EQ(Includes, N->getIncludePath());
+  EXPECT_EQ(Sysroot, N->getISysRoot());
+  EXPECT_EQ(N, DIModule::get(Context, Scope, Name,
+                             ConfigMacro, Includes, Sysroot));
+  EXPECT_NE(N, DIModule::get(Context, getFile(), Name,
+                             ConfigMacro, Includes, Sysroot));
+  EXPECT_NE(N, DIModule::get(Context, Scope, "other",
+                             ConfigMacro, Includes, Sysroot));
+  EXPECT_NE(N, DIModule::get(Context, Scope, Name,
+                             "other", Includes, Sysroot));
+  EXPECT_NE(N, DIModule::get(Context, Scope, Name,
+                             ConfigMacro, "other", Sysroot));
+  EXPECT_NE(N, DIModule::get(Context, Scope, Name,
+                             ConfigMacro, Includes, "other"));
+
+  TempDIModule Temp = N->clone();
+  EXPECT_EQ(N, MDNode::replaceWithUniqued(std::move(Temp)));
+}
+
 typedef MetadataTest DITemplateTypeParameterTest;
 
 TEST_F(DITemplateTypeParameterTest, get) {