[clang][ifs] New interface stubs format (llvm triple based).

After posting llvm-ifs on phabricator, I made some progress in hardening up how
I think the format for Interface Stubs should look. There are a number of
things I think the TBE format was missing (no endianness, no info about the
Object Format because it assumes ELF), so I have added those and broken off
from being as similar to the TBE schema. In a subsequent commit I can drop the
other formats.

An example of how The format will look is as follows:

--- !experimental-ifs-v1
IfsVersion: 1.0
Triple: x86_64-unknown-linux-gnu
ObjectFileFormat: ELF
Symbols:
  _Z9nothiddenv: { Type: Func }
  _Z10cmdVisiblev: { Type: Func }
...

The format is still marked experimental.

Differential Revision: https://reviews.llvm.org/D66446

llvm-svn: 369715

1 files changed, 53 insertions, 0 deletions

diff --git a/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp b/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
index 970f885..cb597c4 100644
--- a/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
+++ b/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
@@ -354,9 +354,55 @@ public:
       OS.flush();
     };
 
+    auto writeIfsV1 =
+        [this](const llvm::Triple &T, const MangledSymbols &Symbols,
+               const ASTContext &context, StringRef Format,
+               raw_ostream &OS) -> void {
+      OS << "--- !" << Format << "\n";
+      OS << "IfsVersion: 1.0\n";
+      OS << "Triple: " << T.str() << "\n";
+      OS << "ObjectFileFormat: " << "ELF" << "\n"; // TODO: For now, just ELF.
+      OS << "Symbols:\n";
+      for (const auto &E : Symbols) {
+        const MangledSymbol &Symbol = E.second;
+        for (auto Name : Symbol.Names) {
+          OS << "  "
+             << (Symbol.ParentName.empty() || Instance.getLangOpts().CPlusPlus
+                     ? ""
+                     : (Symbol.ParentName + "."))
+             << Name << ": { Type: ";
+          switch (Symbol.Type) {
+          default:
+            llvm_unreachable(
+                "clang -emit-iterface-stubs: Unexpected symbol type.");
+          case llvm::ELF::STT_NOTYPE:
+            OS << "NoType";
+            break;
+          case llvm::ELF::STT_OBJECT: {
+            auto VD = cast<ValueDecl>(E.first)->getType();
+            OS << "Object, Size: "
+               << context.getTypeSizeInChars(VD).getQuantity();
+            break;
+          }
+          case llvm::ELF::STT_FUNC:
+            OS << "Func";
+            break;
+          }
+          if (Symbol.Binding == llvm::ELF::STB_WEAK)
+            OS << ", Weak: true";
+          OS << " }\n";
+        }
+      }
+      OS << "...\n";
+      OS.flush();
+    };
+
     if (Format == "experimental-yaml-elf-v1")
       writeIfoYaml(Instance.getTarget().getTriple(), Symbols, context, Format,
                    *OS);
+    else if (Format == "experimental-ifs-v1")
+      writeIfsV1(Instance.getTarget().getTriple(), Symbols, context, Format,
+                 *OS);
     else
       writeIfoElfAbiYaml(Instance.getTarget().getTriple(), Symbols, context,
                          Format, *OS);
@@ -376,3 +422,10 @@ GenerateInterfaceTBEExpV1Action::CreateASTConsumer(CompilerInstance &CI,
   return std::make_unique<InterfaceStubFunctionsConsumer>(
       CI, InFile, "experimental-tapi-elf-v1");
 }
+
+std::unique_ptr<ASTConsumer>
+GenerateInterfaceIfsExpV1Action::CreateASTConsumer(CompilerInstance &CI,
+                                                   StringRef InFile) {
+  return std::make_unique<InterfaceStubFunctionsConsumer>(
+      CI, InFile, "experimental-ifs-v1");
+}