rt: Stub Rust GC metadata printer and Rust GC strategy modules

mk/rustllvm.mk

@@ -2,7 +2,8 @@
 # rustc LLVM-extensions (C++) library variables and rules
 ######################################################################
 
-RUSTLLVM_OBJS_CS := $(addprefix rustllvm/, RustWrapper.cpp)
+RUSTLLVM_OBJS_CS := $(addprefix rustllvm/, RustGCMetadataPrinter.cpp \
+    RustGCStrategy.cpp RustWrapper.cpp)
 
 RUSTLLVM_DEF := rustllvm/rustllvm$(CFG_DEF_SUFFIX)
 

src/rustllvm/RustGCMetadataPrinter.cpp

@@ -0,0 +1,45 @@
+//===-- RustGCPrinter.cpp - Rust garbage collection map printer -----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the emitter for the Rust garbage collection stack maps.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/GCMetadataPrinter.h"
+#include "llvm/Module.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include <cctype>
+
+using namespace llvm;
+
+namespace {
+
+  class RustGCMetadataPrinter : public GCMetadataPrinter {
+  public:
+    void beginAssembly(AsmPrinter &AP) {};
+    void finishAssembly(AsmPrinter &AP) {};
+  };
+
+}
+
+static GCMetadataPrinterRegistry::Add<RustGCMetadataPrinter>
+Y("rust", "Rust GC metadata printer");
+

src/rustllvm/RustGCStrategy.cpp

@@ -0,0 +1,34 @@
+//===- RustGCStrategy.cpp - Rust garbage collection strategy ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the garbage collection strategy for Rust.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/GCStrategy.h"
+
+using namespace llvm;
+
+namespace {
+  class RustGCStrategy : public GCStrategy {
+  public:
+    RustGCStrategy();
+  };
+}
+
+static GCRegistry::Add<RustGCStrategy>
+X("rust", "Rust GC");
+
+RustGCStrategy::RustGCStrategy() {
+  NeededSafePoints = 1 << GC::PostCall;
+  UsesMetadata = true;
+}
+
+