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argpromotion and structretpromote. Basically, when replacing a function, they used the 'changeFunction' api which changes the entry in the function map (and steals/reuses the callgraph node). This has some interesting effects: first, the problem is that it doesn't update the "callee" edges in any callees of the function in the call graph. Second, this covers for a major problem in all the CGSCC pass stuff, which is that it is completely broken when functions are deleted if they *don't* reuse a CGN. (there is a cute little fixme about this though :). This patch changes the protocol that CGSCC passes must obey: now the CGSCC pass manager copies the SCC and preincrements its iterator to avoid passes invalidating it. This allows CGSCC passes to mutate the current SCC. However multiple passes may be run on that SCC, so if passes do this, they are now required to *update* the SCC to be current when they return. Other less interesting parts of this patch are that it makes passes update the CG more directly, eliminates changeFunction, and requires clients of replaceCallSite to specify the new callee CGN if they are changing it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80527 91177308-0d34-0410-b5e6-96231b3b80d8
327 lines
12 KiB
C++
327 lines
12 KiB
C++
//===- CallGraph.h - Build a Module's call graph ----------------*- C++ -*-===//
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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 interface is used to build and manipulate a call graph, which is a very
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// useful tool for interprocedural optimization.
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//
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// Every function in a module is represented as a node in the call graph. The
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// callgraph node keeps track of which functions the are called by the function
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// corresponding to the node.
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//
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// A call graph may contain nodes where the function that they correspond to is
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// null. These 'external' nodes are used to represent control flow that is not
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// represented (or analyzable) in the module. In particular, this analysis
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// builds one external node such that:
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// 1. All functions in the module without internal linkage will have edges
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// from this external node, indicating that they could be called by
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// functions outside of the module.
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// 2. All functions whose address is used for something more than a direct
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// call, for example being stored into a memory location will also have an
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// edge from this external node. Since they may be called by an unknown
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// caller later, they must be tracked as such.
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//
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// There is a second external node added for calls that leave this module.
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// Functions have a call edge to the external node iff:
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// 1. The function is external, reflecting the fact that they could call
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// anything without internal linkage or that has its address taken.
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// 2. The function contains an indirect function call.
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//
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// As an extension in the future, there may be multiple nodes with a null
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// function. These will be used when we can prove (through pointer analysis)
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// that an indirect call site can call only a specific set of functions.
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//
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// Because of these properties, the CallGraph captures a conservative superset
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// of all of the caller-callee relationships, which is useful for
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// transformations.
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//
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// The CallGraph class also attempts to figure out what the root of the
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// CallGraph is, which it currently does by looking for a function named 'main'.
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// If no function named 'main' is found, the external node is used as the entry
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// node, reflecting the fact that any function without internal linkage could
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// be called into (which is common for libraries).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_CALLGRAPH_H
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#define LLVM_ANALYSIS_CALLGRAPH_H
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/System/IncludeFile.h"
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#include <map>
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namespace llvm {
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class Function;
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class Module;
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class CallGraphNode;
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//===----------------------------------------------------------------------===//
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// CallGraph class definition
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//
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class CallGraph {
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protected:
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Module *Mod; // The module this call graph represents
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typedef std::map<const Function *, CallGraphNode *> FunctionMapTy;
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FunctionMapTy FunctionMap; // Map from a function to its node
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public:
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static char ID; // Class identification, replacement for typeinfo
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//===---------------------------------------------------------------------
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// Accessors...
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//
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typedef FunctionMapTy::iterator iterator;
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typedef FunctionMapTy::const_iterator const_iterator;
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/// getModule - Return the module the call graph corresponds to.
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///
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Module &getModule() const { return *Mod; }
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inline iterator begin() { return FunctionMap.begin(); }
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inline iterator end() { return FunctionMap.end(); }
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inline const_iterator begin() const { return FunctionMap.begin(); }
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inline const_iterator end() const { return FunctionMap.end(); }
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// Subscripting operators, return the call graph node for the provided
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// function
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inline const CallGraphNode *operator[](const Function *F) const {
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const_iterator I = FunctionMap.find(F);
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assert(I != FunctionMap.end() && "Function not in callgraph!");
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return I->second;
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}
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inline CallGraphNode *operator[](const Function *F) {
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const_iterator I = FunctionMap.find(F);
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assert(I != FunctionMap.end() && "Function not in callgraph!");
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return I->second;
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}
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/// Returns the CallGraphNode which is used to represent undetermined calls
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/// into the callgraph. Override this if you want behavioral inheritance.
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virtual CallGraphNode* getExternalCallingNode() const { return 0; }
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/// Return the root/main method in the module, or some other root node, such
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/// as the externalcallingnode. Overload these if you behavioral
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/// inheritance.
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virtual CallGraphNode* getRoot() { return 0; }
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virtual const CallGraphNode* getRoot() const { return 0; }
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//===---------------------------------------------------------------------
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// Functions to keep a call graph up to date with a function that has been
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// modified.
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//
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/// removeFunctionFromModule - Unlink the function from this module, returning
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/// it. Because this removes the function from the module, the call graph
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/// node is destroyed. This is only valid if the function does not call any
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/// other functions (ie, there are no edges in it's CGN). The easiest way to
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/// do this is to dropAllReferences before calling this.
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///
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Function *removeFunctionFromModule(CallGraphNode *CGN);
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Function *removeFunctionFromModule(Function *F) {
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return removeFunctionFromModule((*this)[F]);
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}
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/// getOrInsertFunction - This method is identical to calling operator[], but
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/// it will insert a new CallGraphNode for the specified function if one does
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/// not already exist.
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CallGraphNode *getOrInsertFunction(const Function *F);
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//===---------------------------------------------------------------------
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// Pass infrastructure interface glue code...
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//
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protected:
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CallGraph() {}
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public:
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virtual ~CallGraph() { destroy(); }
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/// initialize - Call this method before calling other methods,
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/// re/initializes the state of the CallGraph.
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///
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void initialize(Module &M);
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void print(raw_ostream &o, Module *) const;
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void dump() const;
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protected:
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// destroy - Release memory for the call graph
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virtual void destroy();
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};
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//===----------------------------------------------------------------------===//
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// CallGraphNode class definition
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//
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class CallGraphNode {
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Function *F;
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typedef std::pair<CallSite,CallGraphNode*> CallRecord;
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std::vector<CallRecord> CalledFunctions;
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CallGraphNode(const CallGraphNode &); // Do not implement
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public:
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typedef std::vector<CallRecord> CalledFunctionsVector;
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//===---------------------------------------------------------------------
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// Accessor methods...
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//
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typedef std::vector<CallRecord>::iterator iterator;
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typedef std::vector<CallRecord>::const_iterator const_iterator;
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// getFunction - Return the function that this call graph node represents...
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Function *getFunction() const { return F; }
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inline iterator begin() { return CalledFunctions.begin(); }
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inline iterator end() { return CalledFunctions.end(); }
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inline const_iterator begin() const { return CalledFunctions.begin(); }
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inline const_iterator end() const { return CalledFunctions.end(); }
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inline bool empty() const { return CalledFunctions.empty(); }
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inline unsigned size() const { return (unsigned)CalledFunctions.size(); }
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// Subscripting operator - Return the i'th called function...
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//
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CallGraphNode *operator[](unsigned i) const {
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return CalledFunctions[i].second;
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}
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/// dump - Print out this call graph node.
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///
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void dump() const;
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void print(raw_ostream &OS) const;
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//===---------------------------------------------------------------------
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// Methods to keep a call graph up to date with a function that has been
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// modified
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//
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/// removeAllCalledFunctions - As the name implies, this removes all edges
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/// from this CallGraphNode to any functions it calls.
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void removeAllCalledFunctions() {
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CalledFunctions.clear();
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}
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/// stealCalledFunctionsFrom - Move all the callee information from N to this
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/// node.
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void stealCalledFunctionsFrom(CallGraphNode *N) {
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assert(CalledFunctions.empty() &&
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"Cannot steal callsite information if I already have some");
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std::swap(CalledFunctions, N->CalledFunctions);
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}
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/// addCalledFunction - Add a function to the list of functions called by this
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/// one.
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void addCalledFunction(CallSite CS, CallGraphNode *M) {
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CalledFunctions.push_back(std::make_pair(CS, M));
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}
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/// removeCallEdgeFor - This method removes the edge in the node for the
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/// specified call site. Note that this method takes linear time, so it
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/// should be used sparingly.
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void removeCallEdgeFor(CallSite CS);
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/// removeAnyCallEdgeTo - This method removes all call edges from this node
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/// to the specified callee function. This takes more time to execute than
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/// removeCallEdgeTo, so it should not be used unless necessary.
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void removeAnyCallEdgeTo(CallGraphNode *Callee);
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/// removeOneAbstractEdgeTo - Remove one edge associated with a null callsite
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/// from this node to the specified callee function.
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void removeOneAbstractEdgeTo(CallGraphNode *Callee);
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/// replaceCallSite - Make the edge in the node for Old CallSite be for
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/// New CallSite instead. Note that this method takes linear time, so it
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/// should be used sparingly.
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void replaceCallSite(CallSite Old, CallSite New, CallGraphNode *NewCallee);
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friend class CallGraph;
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// CallGraphNode ctor - Create a node for the specified function.
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inline CallGraphNode(Function *f) : F(f) {}
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};
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//===----------------------------------------------------------------------===//
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// GraphTraits specializations for call graphs so that they can be treated as
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// graphs by the generic graph algorithms.
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//
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// Provide graph traits for tranversing call graphs using standard graph
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// traversals.
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template <> struct GraphTraits<CallGraphNode*> {
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typedef CallGraphNode NodeType;
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typedef std::pair<CallSite, CallGraphNode*> CGNPairTy;
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typedef std::pointer_to_unary_function<CGNPairTy, CallGraphNode*> CGNDerefFun;
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static NodeType *getEntryNode(CallGraphNode *CGN) { return CGN; }
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typedef mapped_iterator<NodeType::iterator, CGNDerefFun> ChildIteratorType;
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static inline ChildIteratorType child_begin(NodeType *N) {
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return map_iterator(N->begin(), CGNDerefFun(CGNDeref));
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}
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static inline ChildIteratorType child_end (NodeType *N) {
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return map_iterator(N->end(), CGNDerefFun(CGNDeref));
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}
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static CallGraphNode *CGNDeref(CGNPairTy P) {
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return P.second;
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}
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};
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template <> struct GraphTraits<const CallGraphNode*> {
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typedef const CallGraphNode NodeType;
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typedef NodeType::const_iterator ChildIteratorType;
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static NodeType *getEntryNode(const CallGraphNode *CGN) { return CGN; }
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static inline ChildIteratorType child_begin(NodeType *N) { return N->begin();}
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static inline ChildIteratorType child_end (NodeType *N) { return N->end(); }
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};
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template<> struct GraphTraits<CallGraph*> : public GraphTraits<CallGraphNode*> {
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static NodeType *getEntryNode(CallGraph *CGN) {
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return CGN->getExternalCallingNode(); // Start at the external node!
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}
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typedef std::pair<const Function*, CallGraphNode*> PairTy;
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typedef std::pointer_to_unary_function<PairTy, CallGraphNode&> DerefFun;
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef mapped_iterator<CallGraph::iterator, DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(CallGraph *CG) {
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return map_iterator(CG->begin(), DerefFun(CGdereference));
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}
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static nodes_iterator nodes_end (CallGraph *CG) {
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return map_iterator(CG->end(), DerefFun(CGdereference));
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}
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static CallGraphNode &CGdereference(PairTy P) {
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return *P.second;
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}
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};
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template<> struct GraphTraits<const CallGraph*> :
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public GraphTraits<const CallGraphNode*> {
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static NodeType *getEntryNode(const CallGraph *CGN) {
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return CGN->getExternalCallingNode();
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}
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef CallGraph::const_iterator nodes_iterator;
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static nodes_iterator nodes_begin(const CallGraph *CG) { return CG->begin(); }
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static nodes_iterator nodes_end (const CallGraph *CG) { return CG->end(); }
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};
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} // End llvm namespace
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// Make sure that any clients of this file link in CallGraph.cpp
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FORCE_DEFINING_FILE_TO_BE_LINKED(CallGraph)
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#endif
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