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856ba76200
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9321 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the top-level Virtual Machine data structure.
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//
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//===----------------------------------------------------------------------===//
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#ifndef VM_H
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#define VM_H
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/PassManager.h"
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#include <map>
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class Function;
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class GlobalValue;
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class Constant;
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class TargetMachine;
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class MachineCodeEmitter;
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class VM : public ExecutionEngine {
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TargetMachine &TM; // The current target we are compiling to
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FunctionPassManager PM; // Passes to compile a function
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MachineCodeEmitter *MCE; // MCE object
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public:
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VM(ModuleProvider *MP, TargetMachine *tm);
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~VM();
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/// create - Create an return a new JIT compiler if there is one available
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/// for the current target. Otherwise, return null.
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///
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static ExecutionEngine *create(ModuleProvider *MP);
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/// run - Start execution with the specified function and arguments.
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///
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virtual GenericValue run(Function *F,
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const std::vector<GenericValue> &ArgValues);
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/// getPointerToNamedFunction - This method returns the address of the
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/// specified function by using the dlsym function call. As such it is only
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/// useful for resolving library symbols, not code generated symbols.
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///
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void *getPointerToNamedFunction(const std::string &Name);
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// CompilationCallback - Invoked the first time that a call site is found,
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// which causes lazy compilation of the target function.
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//
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static void CompilationCallback();
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/// runAtExitHandlers - Before exiting the program, at_exit functions must be
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/// called. This method calls them.
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///
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static void runAtExitHandlers();
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/// getPointerToFunction - This returns the address of the specified function,
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/// compiling it if necessary.
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///
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void *getPointerToFunction(Function *F);
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/// recompileAndRelinkFunction - This method is used to force a function
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/// which has already been compiled, to be compiled again, possibly
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/// after it has been modified. Then the entry to the old copy is overwritten
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/// with a branch to the new copy. If there was no old copy, this acts
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/// just like VM::getPointerToFunction().
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///
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void *recompileAndRelinkFunction(Function *F);
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private:
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static MachineCodeEmitter *createEmitter(VM &V);
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void setupPassManager();
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void runJITOnFunction (Function *F);
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};
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#endif
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