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5eca075b74
In particular, Collector was confusing to implementors. Several thought that this compile-time class was the place to implement their runtime GC heap. Of course, it doesn't even exist at runtime. Specifically, the renames are: Collector -> GCStrategy CollectorMetadata -> GCFunctionInfo CollectorModuleMetadata -> GCModuleInfo CollectorRegistry -> GCRegistry Function::getCollector -> getGC (setGC, hasGC, clearGC) Several accessors and nested types have also been renamed to be consistent. These changes should be obvious. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54899 91177308-0d34-0410-b5e6-96231b3b80d8
193 lines
6.4 KiB
C++
193 lines
6.4 KiB
C++
//===-- GCMetadata.h - Garbage collector metadata -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the GCFunctionInfo and GCModuleInfo classes, which are
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// used as a communication channel from the target code generator to the target
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// garbage collectors. This interface allows code generators and garbage
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// collectors to be developed independently.
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//
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// The GCFunctionInfo class logs the data necessary to build a type accurate
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// stack map. The code generator outputs:
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//
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// - Safe points as specified by the GCStrategy's NeededSafePoints.
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// - Stack offsets for GC roots, as specified by calls to llvm.gcroot
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//
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// As a refinement, liveness analysis calculates the set of live roots at each
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// safe point. Liveness analysis is not presently performed by the code
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// generator, so all roots are assumed live.
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//
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// GCModuleInfo simply collects GCFunctionInfo instances for each Function as
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// they are compiled. This accretion is necessary for collectors which must emit
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// a stack map for the compilation unit as a whole. Therefore, GCFunctionInfo
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// outlives the MachineFunction from which it is derived and must not refer to
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// any code generator data structures.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_GCMETADATA_H
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#define LLVM_CODEGEN_GCMETADATA_H
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#include "llvm/Pass.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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namespace llvm {
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class AsmPrinter;
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class GCStrategy;
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class Constant;
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class TargetAsmInfo;
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namespace GC {
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/// PointKind - The type of a collector-safe point.
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///
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enum PointKind {
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Loop, //< Instr is a loop (backwards branch).
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Return, //< Instr is a return instruction.
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PreCall, //< Instr is a call instruction.
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PostCall //< Instr is the return address of a call.
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};
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}
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/// GCPoint - Metadata for a collector-safe point in machine code.
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///
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struct GCPoint {
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GC::PointKind Kind; //< The kind of the safe point.
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unsigned Num; //< Usually a label.
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GCPoint(GC::PointKind K, unsigned N) : Kind(K), Num(N) {}
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};
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/// GCRoot - Metadata for a pointer to an object managed by the garbage
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/// collector.
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struct GCRoot {
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int Num; //< Usually a frame index.
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int StackOffset; //< Offset from the stack pointer.
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Constant *Metadata; //< Metadata straight from the call to llvm.gcroot.
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GCRoot(int N, Constant *MD) : Num(N), StackOffset(-1), Metadata(MD) {}
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};
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/// GCFunctionInfo - Garbage collection metadata for a single function.
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///
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class GCFunctionInfo {
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public:
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typedef std::vector<GCPoint>::iterator iterator;
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typedef std::vector<GCRoot>::iterator roots_iterator;
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typedef std::vector<GCRoot>::const_iterator live_iterator;
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private:
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const Function &F;
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GCStrategy &S;
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uint64_t FrameSize;
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std::vector<GCRoot> Roots;
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std::vector<GCPoint> SafePoints;
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// FIXME: Liveness. A 2D BitVector, perhaps?
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//
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// BitVector Liveness;
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//
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// bool islive(int point, int root) =
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// Liveness[point * SafePoints.size() + root]
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//
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// The bit vector is the more compact representation where >3.2% of roots
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// are live per safe point (1.5% on 64-bit hosts).
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public:
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GCFunctionInfo(const Function &F, GCStrategy &S);
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~GCFunctionInfo();
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/// getFunction - Return the function to which this metadata applies.
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///
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const Function &getFunction() const { return F; }
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/// getStrategy - Return the GC strategy for the function.
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///
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GCStrategy &getStrategy() { return S; }
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/// addStackRoot - Registers a root that lives on the stack. Num is the
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/// stack object ID for the alloca (if the code generator is
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// using MachineFrameInfo).
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void addStackRoot(int Num, Constant *Metadata) {
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Roots.push_back(GCRoot(Num, Metadata));
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}
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/// addSafePoint - Notes the existence of a safe point. Num is the ID of the
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/// label just prior to the safe point (if the code generator is using
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/// MachineModuleInfo).
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void addSafePoint(GC::PointKind Kind, unsigned Num) {
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SafePoints.push_back(GCPoint(Kind, Num));
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}
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/// getFrameSize/setFrameSize - Records the function's frame size.
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///
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uint64_t getFrameSize() const { return FrameSize; }
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void setFrameSize(uint64_t S) { FrameSize = S; }
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/// begin/end - Iterators for safe points.
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///
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iterator begin() { return SafePoints.begin(); }
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iterator end() { return SafePoints.end(); }
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size_t size() const { return SafePoints.size(); }
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/// roots_begin/roots_end - Iterators for all roots in the function.
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///
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roots_iterator roots_begin() { return Roots.begin(); }
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roots_iterator roots_end () { return Roots.end(); }
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size_t roots_size() const { return Roots.size(); }
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/// live_begin/live_end - Iterators for live roots at a given safe point.
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///
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live_iterator live_begin(const iterator &p) { return roots_begin(); }
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live_iterator live_end (const iterator &p) { return roots_end(); }
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size_t live_size(const iterator &p) const { return roots_size(); }
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};
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/// GCModuleInfo - Garbage collection metadata for a whole module.
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///
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class GCModuleInfo : public ImmutablePass {
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typedef StringMap<GCStrategy*> strategy_map_type;
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typedef std::vector<GCStrategy*> list_type;
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typedef DenseMap<const Function*,GCFunctionInfo*> finfo_map_type;
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strategy_map_type StrategyMap;
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list_type StrategyList;
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finfo_map_type FInfoMap;
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GCStrategy *getOrCreateStrategy(const Module *M, const std::string &Name);
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public:
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typedef list_type::const_iterator iterator;
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static char ID;
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GCModuleInfo();
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~GCModuleInfo();
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/// clear - Resets the pass. The metadata deleter pass calls this.
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///
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void clear();
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/// begin/end - Iterators for used strategies.
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///
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iterator begin() const { return StrategyList.begin(); }
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iterator end() const { return StrategyList.end(); }
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/// get - Look up function metadata.
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///
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GCFunctionInfo &getFunctionInfo(const Function &F);
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};
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}
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#endif
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