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+//===- GCMetadata.h - Garbage collector metadata ----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the GCFunctionInfo and GCModuleInfo classes, which are
+// used as a communication channel from the target code generator to the target
+// garbage collectors. This interface allows code generators and garbage
+// collectors to be developed independently.
+//
+// The GCFunctionInfo class logs the data necessary to build a type accurate
+// stack map. The code generator outputs:
+//
+// - Safe points as specified by the GCStrategy's NeededSafePoints.
+// - Stack offsets for GC roots, as specified by calls to llvm.gcroot
+//
+// As a refinement, liveness analysis calculates the set of live roots at each
+// safe point. Liveness analysis is not presently performed by the code
+// generator, so all roots are assumed live.
+//
+// GCModuleInfo simply collects GCFunctionInfo instances for each Function as
+// they are compiled. This accretion is necessary for collectors which must emit
+// a stack map for the compilation unit as a whole. Therefore, GCFunctionInfo
+// outlives the MachineFunction from which it is derived and must not refer to
+// any code generator data structures.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_GCMETADATA_H
+#define LLVM_CODEGEN_GCMETADATA_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/IR/DebugLoc.h"
+#include "llvm/Pass.h"
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+namespace llvm {
+
+class Constant;
+class Function;
+class MCSymbol;
+
+/// GCPoint - Metadata for a collector-safe point in machine code.
+///
+struct GCPoint {
+ GC::PointKind Kind; ///< The kind of the safe point.
+ MCSymbol *Label; ///< A label.
+ DebugLoc Loc;
+
+ GCPoint(GC::PointKind K, MCSymbol *L, DebugLoc DL)
+ : Kind(K), Label(L), Loc(std::move(DL)) {}
+};
+
+/// GCRoot - Metadata for a pointer to an object managed by the garbage
+/// collector.
+struct GCRoot {
+ int Num; ///< Usually a frame index.
+ int StackOffset = -1; ///< Offset from the stack pointer.
+ const Constant *Metadata; ///< Metadata straight from the call
+ ///< to llvm.gcroot.
+
+ GCRoot(int N, const Constant *MD) : Num(N), Metadata(MD) {}
+};
+
+/// Garbage collection metadata for a single function. Currently, this
+/// information only applies to GCStrategies which use GCRoot.
+class GCFunctionInfo {
+public:
+ using iterator = std::vector<GCPoint>::iterator;
+ using roots_iterator = std::vector<GCRoot>::iterator;
+ using live_iterator = std::vector<GCRoot>::const_iterator;
+
+private:
+ const Function &F;
+ GCStrategy &S;
+ uint64_t FrameSize;
+ std::vector<GCRoot> Roots;
+ std::vector<GCPoint> SafePoints;
+
+ // FIXME: Liveness. A 2D BitVector, perhaps?
+ //
+ // BitVector Liveness;
+ //
+ // bool islive(int point, int root) =
+ // Liveness[point * SafePoints.size() + root]
+ //
+ // The bit vector is the more compact representation where >3.2% of roots
+ // are live per safe point (1.5% on 64-bit hosts).
+
+public:
+ GCFunctionInfo(const Function &F, GCStrategy &S);
+ ~GCFunctionInfo();
+
+ /// getFunction - Return the function to which this metadata applies.
+ const Function &getFunction() const { return F; }
+
+ /// getStrategy - Return the GC strategy for the function.
+ GCStrategy &getStrategy() { return S; }
+
+ /// addStackRoot - Registers a root that lives on the stack. Num is the
+ /// stack object ID for the alloca (if the code generator is
+ // using MachineFrameInfo).
+ void addStackRoot(int Num, const Constant *Metadata) {
+ Roots.push_back(GCRoot(Num, Metadata));
+ }
+
+ /// removeStackRoot - Removes a root.
+ roots_iterator removeStackRoot(roots_iterator position) {
+ return Roots.erase(position);
+ }
+
+ /// addSafePoint - Notes the existence of a safe point. Num is the ID of the
+ /// label just prior to the safe point (if the code generator is using
+ /// MachineModuleInfo).
+ void addSafePoint(GC::PointKind Kind, MCSymbol *Label, const DebugLoc &DL) {
+ SafePoints.emplace_back(Kind, Label, DL);
+ }
+
+ /// getFrameSize/setFrameSize - Records the function's frame size.
+ uint64_t getFrameSize() const { return FrameSize; }
+ void setFrameSize(uint64_t S) { FrameSize = S; }
+
+ /// begin/end - Iterators for safe points.
+ iterator begin() { return SafePoints.begin(); }
+ iterator end() { return SafePoints.end(); }
+ size_t size() const { return SafePoints.size(); }
+
+ /// roots_begin/roots_end - Iterators for all roots in the function.
+ roots_iterator roots_begin() { return Roots.begin(); }
+ roots_iterator roots_end() { return Roots.end(); }
+ size_t roots_size() const { return Roots.size(); }
+
+ /// live_begin/live_end - Iterators for live roots at a given safe point.
+ live_iterator live_begin(const iterator &p) { return roots_begin(); }
+ live_iterator live_end(const iterator &p) { return roots_end(); }
+ size_t live_size(const iterator &p) const { return roots_size(); }
+};
+
+/// An analysis pass which caches information about the entire Module.
+/// Records both the function level information used by GCRoots and a
+/// cache of the 'active' gc strategy objects for the current Module.
+class GCModuleInfo : public ImmutablePass {
+ /// An owning list of all GCStrategies which have been created
+ SmallVector<std::unique_ptr<GCStrategy>, 1> GCStrategyList;
+ /// A helper map to speedup lookups into the above list
+ StringMap<GCStrategy*> GCStrategyMap;
+
+public:
+ /// Lookup the GCStrategy object associated with the given gc name.
+ /// Objects are owned internally; No caller should attempt to delete the
+ /// returned objects.
+ GCStrategy *getGCStrategy(const StringRef Name);
+
+ /// List of per function info objects. In theory, Each of these
+ /// may be associated with a different GC.
+ using FuncInfoVec = std::vector<std::unique_ptr<GCFunctionInfo>>;
+
+ FuncInfoVec::iterator funcinfo_begin() { return Functions.begin(); }
+ FuncInfoVec::iterator funcinfo_end() { return Functions.end(); }
+
+private:
+ /// Owning list of all GCFunctionInfos associated with this Module
+ FuncInfoVec Functions;
+
+ /// Non-owning map to bypass linear search when finding the GCFunctionInfo
+ /// associated with a particular Function.
+ using finfo_map_type = DenseMap<const Function *, GCFunctionInfo *>;
+ finfo_map_type FInfoMap;
+
+public:
+ using iterator = SmallVector<std::unique_ptr<GCStrategy>, 1>::const_iterator;
+
+ static char ID;
+
+ GCModuleInfo();
+
+ /// clear - Resets the pass. Any pass, which uses GCModuleInfo, should
+ /// call it in doFinalization().
+ ///
+ void clear();
+
+ /// begin/end - Iterators for used strategies.
+ ///
+ iterator begin() const { return GCStrategyList.begin(); }
+ iterator end() const { return GCStrategyList.end(); }
+
+ /// get - Look up function metadata. This is currently assumed
+ /// have the side effect of initializing the associated GCStrategy. That
+ /// will soon change.
+ GCFunctionInfo &getFunctionInfo(const Function &F);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_GCMETADATA_H