llvm-6502/lib/ExecutionEngine/JIT/JIT.h
Jeffrey Yasskin df5a7daff9 Add a JITEventListener interface that gets called back when a new function is
emitted or the machine code for a function is freed.  Chris mentioned that we
may also want a notification when a stub is emitted, but that'll be a future
change.  I intend to use this to tell oprofile where functions are emitted and
what lines correspond to what addresses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74157 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-25 02:04:04 +00:00

188 lines
6.6 KiB
C++

//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the top-level JIT data structure.
//
//===----------------------------------------------------------------------===//
#ifndef JIT_H
#define JIT_H
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/PassManager.h"
namespace llvm {
class Function;
class JITEvent_EmittedFunctionDetails;
class MachineCodeEmitter;
class MachineCodeInfo;
class TargetJITInfo;
class TargetMachine;
class JITState {
private:
FunctionPassManager PM; // Passes to compile a function
ModuleProvider *MP; // ModuleProvider used to create the PM
/// PendingFunctions - Functions which have not been code generated yet, but
/// were called from a function being code generated.
std::vector<Function*> PendingFunctions;
public:
explicit JITState(ModuleProvider *MP) : PM(MP), MP(MP) {}
FunctionPassManager &getPM(const MutexGuard &L) {
return PM;
}
ModuleProvider *getMP() const { return MP; }
std::vector<Function*> &getPendingFunctions(const MutexGuard &L) {
return PendingFunctions;
}
};
class JIT : public ExecutionEngine {
TargetMachine &TM; // The current target we are compiling to
TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
JITCodeEmitter *JCE; // JCE object
std::vector<JITEventListener*> EventListeners;
JITState *jitstate;
JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
JITMemoryManager *JMM, CodeGenOpt::Level OptLevel);
public:
~JIT();
static void Register() {
JITCtor = create;
}
/// getJITInfo - Return the target JIT information structure.
///
TargetJITInfo &getJITInfo() const { return TJI; }
/// create - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise, return null.
///
static ExecutionEngine *create(ModuleProvider *MP, std::string *Err,
CodeGenOpt::Level OptLevel =
CodeGenOpt::Default) {
return createJIT(MP, Err, 0, OptLevel);
}
virtual void addModuleProvider(ModuleProvider *MP);
/// removeModuleProvider - Remove a ModuleProvider from the list of modules.
/// Relases the Module from the ModuleProvider, materializing it in the
/// process, and returns the materialized Module.
virtual Module *removeModuleProvider(ModuleProvider *MP,
std::string *ErrInfo = 0);
/// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
/// and deletes the ModuleProvider and owned Module. Avoids materializing
/// the underlying module.
virtual void deleteModuleProvider(ModuleProvider *P,std::string *ErrInfo = 0);
/// runFunction - Start execution with the specified function and arguments.
///
virtual GenericValue runFunction(Function *F,
const std::vector<GenericValue> &ArgValues);
/// getPointerToNamedFunction - This method returns the address of the
/// specified function by using the dlsym function call. As such it is only
/// useful for resolving library symbols, not code generated symbols.
///
/// If AbortOnFailure is false and no function with the given name is
/// found, this function silently returns a null pointer. Otherwise,
/// it prints a message to stderr and aborts.
///
void *getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure = true);
// CompilationCallback - Invoked the first time that a call site is found,
// which causes lazy compilation of the target function.
//
static void CompilationCallback();
/// getPointerToFunction - This returns the address of the specified function,
/// compiling it if necessary.
///
void *getPointerToFunction(Function *F);
/// getOrEmitGlobalVariable - Return the address of the specified global
/// variable, possibly emitting it to memory if needed. This is used by the
/// Emitter.
void *getOrEmitGlobalVariable(const GlobalVariable *GV);
/// getPointerToFunctionOrStub - If the specified function has been
/// code-gen'd, return a pointer to the function. If not, compile it, or use
/// a stub to implement lazy compilation if available.
///
void *getPointerToFunctionOrStub(Function *F);
/// recompileAndRelinkFunction - This method is used to force a function
/// which has already been compiled, to be compiled again, possibly
/// after it has been modified. Then the entry to the old copy is overwritten
/// with a branch to the new copy. If there was no old copy, this acts
/// just like JIT::getPointerToFunction().
///
void *recompileAndRelinkFunction(Function *F);
/// freeMachineCodeForFunction - deallocate memory used to code-generate this
/// Function.
///
void freeMachineCodeForFunction(Function *F);
/// addPendingFunction - while jitting non-lazily, a called but non-codegen'd
/// function was encountered. Add it to a pending list to be processed after
/// the current function.
///
void addPendingFunction(Function *F);
/// getCodeEmitter - Return the code emitter this JIT is emitting into.
JITCodeEmitter *getCodeEmitter() const { return JCE; }
static ExecutionEngine *createJIT(ModuleProvider *MP, std::string *Err,
JITMemoryManager *JMM,
CodeGenOpt::Level OptLevel);
// Run the JIT on F and return information about the generated code
void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
virtual void RegisterJITEventListener(JITEventListener *L);
virtual void UnregisterJITEventListener(JITEventListener *L);
/// These functions correspond to the methods on JITEventListener. They
/// iterate over the registered listeners and call the corresponding method on
/// each.
void NotifyFunctionEmitted(
const Function &F, void *Code, size_t Size,
const JITEvent_EmittedFunctionDetails &Details);
void NotifyFreeingMachineCode(const Function &F, void *OldPtr);
private:
static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
void updateFunctionStub(Function *F);
void updateDlsymStubTable();
protected:
/// getMemoryforGV - Allocate memory for a global variable.
virtual char* getMemoryForGV(const GlobalVariable* GV);
};
} // End llvm namespace
#endif