Factor GC metadata table assembly generation out of Collector in preparation for splitting AsmPrinter into its own library.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54881 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/GCStrategy.h

@@ -0,0 +1,167 @@
+//===-- llvm/CodeGen/Collector.h - Garbage collection -----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Collector records sufficient information about a machine function to enable
+// accurate garbage collectors. Specifically:
+// 
+// - Safe points
+//   Garbage collection is only possible at certain points in code. Code
+//   generators should record points:
+//
+//     - At and after any call to a subroutine
+//     - Before returning from the current function
+//     - Before backwards branches (loops)
+// 
+// - Roots
+//   When a reference to a GC-allocated object exists on the stack, it must be
+//   stored in an alloca registered with llvm.gcoot.
+//
+// This generic information should used by ABI-specific passes to emit support
+// tables for the runtime garbage collector.
+//
+// MachineCodeAnalysis identifies the GC safe points in the machine code. (Roots
+// are identified in SelectionDAGISel.)
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_COLLECTOR_H
+#define LLVM_CODEGEN_COLLECTOR_H
+
+#include "llvm/CodeGen/GCMetadata.h"
+#include <iosfwd>
+#include <string>
+
+namespace llvm {
+  
+  /// Collector describes a garbage collector's code generation requirements,
+  /// and provides overridable hooks for those needs which cannot be abstractly
+  /// described.
+  class Collector {
+  public:
+    typedef std::vector<CollectorMetadata*> list_type;
+    typedef list_type::iterator iterator;
+    
+  private:
+    friend class CollectorModuleMetadata;
+    const Module *M;
+    std::string Name;
+    
+    list_type Functions;
+    
+  protected:
+    unsigned NeededSafePoints; //< Bitmask of required safe points.
+    bool CustomReadBarriers;   //< Default is to insert loads.
+    bool CustomWriteBarriers;  //< Default is to insert stores.
+    bool CustomRoots;          //< Default is to pass through to backend.
+    bool InitRoots;            //< If set, roots are nulled during lowering.
+    bool UsesMetadata;         //< If set, backend must emit metadata tables.
+    
+  public:
+    Collector();
+    
+    virtual ~Collector();
+    
+    
+    /// getName - The name of the collector, for debugging.
+    /// 
+    const std::string &getName() const { return Name; }
+
+    /// getModule - The module upon which the collector is operating.
+    /// 
+    const Module &getModule() const { return *M; }
+
+    /// True if this collector requires safe points of any kind. By default,
+    /// none are recorded.
+    bool needsSafePoints() const { return NeededSafePoints != 0; }
+    
+    /// True if the collector requires the given kind of safe point. By default,
+    /// none are recorded.
+    bool needsSafePoint(GC::PointKind Kind) const {
+      return (NeededSafePoints & 1 << Kind) != 0;
+    }
+    
+    /// By default, write barriers are replaced with simple store instructions.
+    /// If true, then addPassesToCustomLowerIntrinsics must instead process
+    /// them.
+    bool customWriteBarrier() const { return CustomWriteBarriers; }
+    
+    /// By default, read barriers are replaced with simple load instructions.
+    /// If true, then addPassesToCustomLowerIntrinsics must instead process
+    /// them.
+    bool customReadBarrier() const { return CustomReadBarriers; }
+    
+    /// By default, roots are left for the code generator. If Custom, then 
+    /// addPassesToCustomLowerIntrinsics must add passes to delete them.
+    bool customRoots() const { return CustomRoots; }
+    
+    /// If set, gcroot intrinsics should initialize their allocas to null. This
+    /// is necessary for most collectors.
+    bool initializeRoots() const { return InitRoots; }
+    
+    /// If set, appropriate metadata tables must be emitted by the back-end
+    /// (assembler, JIT, or otherwise).
+    bool usesMetadata() const { return UsesMetadata; }
+    
+    /// begin/end - Iterators for function metadata.
+    /// 
+    iterator begin() { return Functions.begin(); }
+    iterator end()   { return Functions.end();   }
+
+    /// insertFunctionMetadata - Creates metadata for a function.
+    /// 
+    CollectorMetadata *insertFunctionMetadata(const Function &F);
+
+    /// initializeCustomLowering/performCustomLowering - If any of the actions
+    /// are set to custom, performCustomLowering must be overriden to create a
+    /// transform to lower those actions to LLVM IR. initializeCustomLowering
+    /// is optional to override. These are the only Collector methods through
+    /// which the LLVM IR can be modified.
+    virtual bool initializeCustomLowering(Module &F);
+    virtual bool performCustomLowering(Function &F);
+  };
+  
+  // GCMetadataPrinter - Emits GC metadata as assembly code.
+  class GCMetadataPrinter {
+  public:
+    typedef Collector::list_type list_type;
+    typedef Collector::iterator iterator;
+    
+  private:
+    Collector *Coll;
+    
+    friend class AsmPrinter;
+    
+  protected:
+    // May only be subclassed.
+    GCMetadataPrinter();
+    
+    // Do not implement.
+    GCMetadataPrinter(const GCMetadataPrinter &);
+    GCMetadataPrinter &operator=(const GCMetadataPrinter &);
+    
+  public:
+    Collector &getCollector() { return *Coll; }
+    const Module &getModule() const { return Coll->getModule(); }
+    
+    iterator begin() { return Coll->begin(); }
+    iterator end()   { return Coll->end();   }
+    
+    /// beginAssembly/finishAssembly - Emit module metadata as assembly code.
+    virtual void beginAssembly(std::ostream &OS, AsmPrinter &AP,
+                               const TargetAsmInfo &TAI);
+    
+    virtual void finishAssembly(std::ostream &OS, AsmPrinter &AP,
+                                const TargetAsmInfo &TAI);
+    
+    virtual ~GCMetadataPrinter();
+  };
+  
+}
+
+#endif

include/llvm/CodeGen/GCs.h

@@ -12,8 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CODEGEN_COLLECTORS_H
+#ifndef LLVM_CODEGEN_GCS_H
-#define LLVM_CODEGEN_COLLECTORS_H
+#define LLVM_CODEGEN_GCS_H
 
 #include "llvm/Support/Registry.h"
 
@@ -36,6 +36,9 @@ namespace llvm {
   /// Creates an ocaml-compatible garbage collector.
   Collector *createOcamlCollector();
   
+  /// Creates an ocaml-compatible metadata printer.
+  GCMetadataPrinter *createOcamlMetadataPrinter();
+  
   /// Creates a shadow stack garbage collector. This collector requires no code
   /// generator support.
   Collector *createShadowStackCollector();

include/llvm/CodeGen/LinkAllCodegenComponents.h

@@ -17,7 +17,7 @@
 
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/ScheduleDAG.h"
-#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/GCs.h"
 
 namespace {
   struct ForceCodegenLinking {
@@ -37,6 +37,7 @@ namespace {
       (void) llvm::createSimpleRegisterCoalescer();
       
       (void) llvm::createOcamlCollector();
+      (void) llvm::createOcamlMetadataPrinter();
       (void) llvm::createShadowStackCollector();
       
       (void) llvm::createBURRListDAGScheduler(NULL, NULL, NULL, false);

lib/CodeGen/AsmPrinter.cpp

@@ -16,9 +16,9 @@
 #include "llvm/DerivedTypes.h"
 #include "llvm/Constants.h"
 #include "llvm/Module.h"
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
-#include "llvm/CodeGen/CollectorMetadata.h"
+#include "llvm/CodeGen/GCMetadata.h"
-#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/GCs.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"

lib/CodeGen/GCMetadata.cpp

@@ -12,9 +12,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/CodeGen/CollectorMetadata.h"
+#include "llvm/CodeGen/GCMetadata.h"
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
-#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/GCs.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/Pass.h"
 #include "llvm/CodeGen/Passes.h"

lib/CodeGen/GCMetadataPrinter.cpp

@@ -0,0 +1,31 @@
+//===-- Collector.cpp - Garbage collection infrastructure -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements target- and collector-independent garbage collection
+// infrastructure.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCStrategy.h"
+
+using namespace llvm;
+
+GCMetadataPrinter::GCMetadataPrinter() { }
+
+GCMetadataPrinter::~GCMetadataPrinter() { }
+
+void GCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
+                                      const TargetAsmInfo &TAI) {
+  // Default is no action.
+}
+
+void GCMetadataPrinter::finishAssembly(std::ostream &OS, AsmPrinter &AP,
+                                       const TargetAsmInfo &TAI) {
+  // Default is no action.
+}

lib/CodeGen/GCStrategy.cpp

@@ -12,12 +12,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -119,22 +117,6 @@ CollectorMetadata *Collector::insertFunctionMetadata(const Function &F) {
 
 // -----------------------------------------------------------------------------
 
-GCMetadataPrinter::GCMetadataPrinter() { }
-
-GCMetadataPrinter::~GCMetadataPrinter() { }
-
-void GCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
-                                      const TargetAsmInfo &TAI) {
-  // Default is no action.
-}
-
-void GCMetadataPrinter::finishAssembly(std::ostream &OS, AsmPrinter &AP,
-                                       const TargetAsmInfo &TAI) {
-  // Default is no action.
-}
-
-// -----------------------------------------------------------------------------
-
 FunctionPass *llvm::createGCLoweringPass() {
   return new LowerIntrinsics();
 }

lib/CodeGen/GCs.cpp

@@ -11,7 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/GCs.h"
 
 using namespace llvm;
 

lib/CodeGen/LLVMTargetMachine.cpp

@@ -17,7 +17,7 @@
 #include "llvm/Assembly/PrintModulePass.h"
 #include "llvm/Analysis/LoopPass.h"
 #include "llvm/CodeGen/Passes.h"
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Transforms/Scalar.h"

lib/CodeGen/OcamlGC.cpp

@@ -0,0 +1,46 @@
+//===-- OcamlCollector.cpp - Ocaml frametable emitter ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements lowering for the llvm.gc* intrinsics compatible with
+// Objective Caml 3.10.0, which uses a liveness-accurate static stack map.
+//
+//===----------------------------------------------------------------------===//
+                        
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/Module.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+
+using namespace llvm;
+
+namespace {
+
+  class VISIBILITY_HIDDEN OcamlCollector : public Collector {
+  public:
+    OcamlCollector();
+  };
+  
+}
+
+static CollectorRegistry::Add<OcamlCollector>
+X("ocaml", "ocaml 3.10-compatible collector");
+
+// -----------------------------------------------------------------------------
+
+Collector *llvm::createOcamlCollector() {
+  return new OcamlCollector();
+}
+
+OcamlCollector::OcamlCollector() {
+  NeededSafePoints = 1 << GC::PostCall;
+  UsesMetadata = true;
+}

lib/CodeGen/OcamlGCPrinter.cpp

@@ -12,9 +12,9 @@
 //
 //===----------------------------------------------------------------------===//
                         
-#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/GCs.h"
 #include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/Module.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetData.h"
@@ -24,11 +24,6 @@ using namespace llvm;
 
 namespace {
 
-  class VISIBILITY_HIDDEN OcamlCollector : public Collector {
-  public:
-    OcamlCollector();
-  };
-
   class VISIBILITY_HIDDEN OcamlGCMetadataPrinter : public GCMetadataPrinter {
   public:
     void beginAssembly(std::ostream &OS, AsmPrinter &AP,
@@ -40,13 +35,12 @@ namespace {
   
 }
 
-static CollectorRegistry::Add<OcamlCollector>
-X("ocaml", "ocaml 3.10-compatible collector");
-
 static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
 Y("ocaml", "ocaml 3.10-compatible collector");
 
-// -----------------------------------------------------------------------------
+GCMetadataPrinter *llvm::createOcamlMetadataPrinter() {
+  return new OcamlGCMetadataPrinter();
+}
 
 static void EmitCamlGlobal(const Module &M, std::ostream &OS, AsmPrinter &AP,
                            const TargetAsmInfo &TAI, const char *Id) {
@@ -68,15 +62,6 @@ static void EmitCamlGlobal(const Module &M, std::ostream &OS, AsmPrinter &AP,
   OS << Mangled << ":\n";
 }
 
-Collector *llvm::createOcamlCollector() {
-  return new OcamlCollector();
-}
-
-OcamlCollector::OcamlCollector() {
-  NeededSafePoints = 1 << GC::PostCall;
-  UsesMetadata = true;
-}
-
 void OcamlGCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
                                            const TargetAsmInfo &TAI) {
   AP.SwitchToTextSection(TAI.getTextSection());

lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -26,7 +26,7 @@
 #include "llvm/Intrinsics.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/ParameterAttributes.h"
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"

lib/CodeGen/ShadowStackGC.cpp

@@ -26,9 +26,9 @@
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "shadowstackgc"
-#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/GCs.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/CodeGen/Collector.h"
+#include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/Module.h"
 #include "llvm/Support/IRBuilder.h"