- class GCFunctionInfo {
- public:
- typedef std::vector<GCPoint>::iterator iterator;
- typedef std::vector<GCRoot>::iterator roots_iterator;
- typedef std::vector<GCRoot>::const_iterator live_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, DebugLoc DL) {
- SafePoints.push_back(GCPoint(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(); }
- };
-
-
- /// GCModuleInfo - Garbage collection metadata for a whole module.
- ///
- class GCModuleInfo : public ImmutablePass {
- typedef StringMap<GCStrategy*> strategy_map_type;
- typedef std::vector<std::unique_ptr<GCStrategy>> list_type;
- typedef DenseMap<const Function*,GCFunctionInfo*> finfo_map_type;
-
- strategy_map_type StrategyMap;
- list_type StrategyList;
- finfo_map_type FInfoMap;