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have an address available, but have not yet been code generated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6059 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
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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 "../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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PassManager PM; // Passes to compile a function
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MachineCodeEmitter *MCE; // MCE object
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// FunctionRefs - A mapping between addresses that refer to unresolved
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// functions and the LLVM function object itself. This is used by the fault
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// handler to lazily patch up references...
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//
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std::map<void*, Function*> FunctionRefs;
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public:
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VM(Module *M, TargetMachine *tm);
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~VM();
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/// run - Start execution with the specified function and arguments.
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///
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virtual int run(const std::string &FnName,
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const std::vector<std::string> &Args);
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void addFunctionRef(void *Ref, Function *F) {
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FunctionRefs[Ref] = F;
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}
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const std::string &getFunctionReferencedName(void *RefAddr);
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void *resolveFunctionReference(void *RefAddr);
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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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private:
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static MachineCodeEmitter *createEmitter(VM &V);
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void setupPassManager();
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void *getPointerToFunction(const Function *F);
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void registerCallback();
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/// emitStubForFunction - This method is used by the JIT when it needs to emit
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/// the address of a function for a function whose code has not yet been
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/// generated. In order to do this, it generates a stub which jumps to the
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/// lazy function compiler, which will eventually get fixed to call the
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/// function directly.
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///
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void *emitStubForFunction(const Function &F);
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};
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#endif
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