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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5471 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
//===-- PoolAllocate.h - Pool allocation pass -------------------*- C++ -*-===//
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//
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// This transform changes programs so that disjoint data structures are
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// allocated out of different pools of memory, increasing locality. This header
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// file exposes information about the pool allocation itself so that follow-on
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// passes may extend or use the pool allocation for analysis.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_POOLALLOCATE_H
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#define LLVM_TRANSFORMS_POOLALLOCATE_H
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#include "llvm/Pass.h"
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#include "Support/hash_set"
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class BUDataStructures;
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class DSNode;
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class DSGraph;
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namespace PA {
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/// FuncInfo - Represent the pool allocation information for one function in
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/// the program. Note that many functions must actually be cloned in order
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/// for pool allocation to add arguments to the function signature. In this
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/// case, the Clone and NewToOldValueMap information identify how the clone
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/// maps to the original function...
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///
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struct FuncInfo {
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/// MarkedNodes - The set of nodes which are not locally pool allocatable in
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/// the current function.
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///
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hash_set<DSNode*> MarkedNodes;
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/// Clone - The cloned version of the function, if applicable.
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Function *Clone;
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/// ArgNodes - The list of DSNodes which have pools passed in as arguments.
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///
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std::vector<DSNode*> ArgNodes;
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/// PoolDescriptors - The Value* (either an argument or an alloca) which
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/// defines the pool descriptor for this DSNode. Pools are mapped one to
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/// one with nodes in the DSGraph, so this contains a pointer to the node it
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/// corresponds to. In addition, the pool is initialized by calling the
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/// "poolinit" library function with a chunk of memory allocated with an
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/// alloca instruction. This entry contains a pointer to that alloca if the
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/// pool is locally allocated or the argument it is passed in through if
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/// not.
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///
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std::map<DSNode*, Value*> PoolDescriptors;
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/// NewToOldValueMap - When and if a function needs to be cloned, this map
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/// contains a mapping from all of the values in the new function back to
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/// the values they correspond to in the old function.
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///
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std::map<Value*, const Value*> NewToOldValueMap;
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};
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}
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/// PoolAllocate - The main pool allocation pass
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///
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class PoolAllocate : public Pass {
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Module *CurModule;
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BUDataStructures *BU;
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std::map<Function*, PA::FuncInfo> FunctionInfo;
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public:
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Function *PoolInit, *PoolDestroy, *PoolAlloc, *PoolFree;
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public:
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bool run(Module &M);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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BUDataStructures &getBUDataStructures() const { return *BU; }
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PA::FuncInfo *getFuncInfo(Function &F) {
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std::map<Function*, PA::FuncInfo>::iterator I = FunctionInfo.find(&F);
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return I != FunctionInfo.end() ? &I->second : 0;
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}
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private:
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/// AddPoolPrototypes - Add prototypes for the pool functions to the
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/// specified module and update the Pool* instance variables to point to
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/// them.
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///
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void AddPoolPrototypes();
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/// MakeFunctionClone - If the specified function needs to be modified for
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/// pool allocation support, make a clone of it, adding additional arguments
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/// as neccesary, and return it. If not, just return null.
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///
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Function *MakeFunctionClone(Function &F);
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/// ProcessFunctionBody - Rewrite the body of a transformed function to use
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/// pool allocation where appropriate.
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///
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void ProcessFunctionBody(Function &Old, Function &New);
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/// CreatePools - This creates the pool initialization and destruction code
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/// for the DSNodes specified by the NodesToPA list. This adds an entry to
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/// the PoolDescriptors map for each DSNode.
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///
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void CreatePools(Function &F, const std::vector<DSNode*> &NodesToPA,
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std::map<DSNode*, Value*> &PoolDescriptors);
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void TransformFunctionBody(Function &F, DSGraph &G, PA::FuncInfo &FI);
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};
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#endif
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