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242 lines
8.8 KiB
C++
242 lines
8.8 KiB
C++
//===-- Interpreter.h ------------------------------------------*- 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 header file defines the interpreter structure
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLI_INTERPRETER_H
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#define LLI_INTERPRETER_H
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#include "llvm/Function.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ADT/APInt.h"
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#include "llvm/Support/InstVisitor.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class IntrinsicLowering;
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struct FunctionInfo;
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template<typename T> class generic_gep_type_iterator;
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class ConstantExpr;
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typedef generic_gep_type_iterator<User::const_op_iterator> gep_type_iterator;
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// AllocaHolder - Object to track all of the blocks of memory allocated by
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// alloca. When the function returns, this object is popped off the execution
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// stack, which causes the dtor to be run, which frees all the alloca'd memory.
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//
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class AllocaHolder {
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friend class AllocaHolderHandle;
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std::vector<void*> Allocations;
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unsigned RefCnt;
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public:
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AllocaHolder() : RefCnt(0) {}
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void add(void *mem) { Allocations.push_back(mem); }
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~AllocaHolder() {
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for (unsigned i = 0; i < Allocations.size(); ++i)
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free(Allocations[i]);
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}
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};
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// AllocaHolderHandle gives AllocaHolder value semantics so we can stick it into
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// a vector...
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//
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class AllocaHolderHandle {
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AllocaHolder *H;
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public:
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AllocaHolderHandle() : H(new AllocaHolder()) { H->RefCnt++; }
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AllocaHolderHandle(const AllocaHolderHandle &AH) : H(AH.H) { H->RefCnt++; }
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~AllocaHolderHandle() { if (--H->RefCnt == 0) delete H; }
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void add(void *mem) { H->add(mem); }
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};
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typedef std::vector<GenericValue> ValuePlaneTy;
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// ExecutionContext struct - This struct represents one stack frame currently
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// executing.
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//
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struct ExecutionContext {
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Function *CurFunction;// The currently executing function
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BasicBlock *CurBB; // The currently executing BB
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BasicBlock::iterator CurInst; // The next instruction to execute
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std::map<Value *, GenericValue> Values; // LLVM values used in this invocation
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std::vector<GenericValue> VarArgs; // Values passed through an ellipsis
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CallSite Caller; // Holds the call that called subframes.
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// NULL if main func or debugger invoked fn
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AllocaHolderHandle Allocas; // Track memory allocated by alloca
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};
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// Interpreter - This class represents the entirety of the interpreter.
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//
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class Interpreter : public ExecutionEngine, public InstVisitor<Interpreter> {
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GenericValue ExitValue; // The return value of the called function
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TargetData TD;
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IntrinsicLowering *IL;
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// The runtime stack of executing code. The top of the stack is the current
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// function record.
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std::vector<ExecutionContext> ECStack;
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// AtExitHandlers - List of functions to call when the program exits,
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// registered with the atexit() library function.
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std::vector<Function*> AtExitHandlers;
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public:
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explicit Interpreter(ModuleProvider *M);
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~Interpreter();
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/// runAtExitHandlers - Run any functions registered by the program's calls to
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/// atexit(3), which we intercept and store in AtExitHandlers.
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///
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void runAtExitHandlers();
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static void Register() {
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InterpCtor = create;
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}
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/// create - Create an interpreter ExecutionEngine. This can never fail.
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///
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static ExecutionEngine *create(ModuleProvider *M, std::string *ErrorStr = 0);
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/// run - Start execution with the specified function and arguments.
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///
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virtual GenericValue runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues);
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/// recompileAndRelinkFunction - For the interpreter, functions are always
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/// up-to-date.
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///
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virtual void *recompileAndRelinkFunction(Function *F) {
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return getPointerToFunction(F);
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}
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/// freeMachineCodeForFunction - The interpreter does not generate any code.
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///
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void freeMachineCodeForFunction(Function *F) { }
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// Methods used to execute code:
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// Place a call on the stack
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void callFunction(Function *F, const std::vector<GenericValue> &ArgVals);
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void run(); // Execute instructions until nothing left to do
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// Opcode Implementations
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void visitReturnInst(ReturnInst &I);
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void visitBranchInst(BranchInst &I);
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void visitSwitchInst(SwitchInst &I);
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void visitBinaryOperator(BinaryOperator &I);
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void visitICmpInst(ICmpInst &I);
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void visitFCmpInst(FCmpInst &I);
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void visitAllocationInst(AllocationInst &I);
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void visitFreeInst(FreeInst &I);
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void visitLoadInst(LoadInst &I);
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void visitStoreInst(StoreInst &I);
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void visitGetElementPtrInst(GetElementPtrInst &I);
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void visitPHINode(PHINode &PN) { assert(0 && "PHI nodes already handled!"); }
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void visitTruncInst(TruncInst &I);
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void visitZExtInst(ZExtInst &I);
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void visitSExtInst(SExtInst &I);
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void visitFPTruncInst(FPTruncInst &I);
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void visitFPExtInst(FPExtInst &I);
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void visitUIToFPInst(UIToFPInst &I);
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void visitSIToFPInst(SIToFPInst &I);
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void visitFPToUIInst(FPToUIInst &I);
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void visitFPToSIInst(FPToSIInst &I);
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void visitPtrToIntInst(PtrToIntInst &I);
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void visitIntToPtrInst(IntToPtrInst &I);
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void visitBitCastInst(BitCastInst &I);
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void visitSelectInst(SelectInst &I);
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void visitCallSite(CallSite CS);
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void visitCallInst(CallInst &I) { visitCallSite (CallSite (&I)); }
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void visitInvokeInst(InvokeInst &I) { visitCallSite (CallSite (&I)); }
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void visitUnwindInst(UnwindInst &I);
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void visitUnreachableInst(UnreachableInst &I);
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void visitShl(BinaryOperator &I);
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void visitLShr(BinaryOperator &I);
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void visitAShr(BinaryOperator &I);
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void visitVAArgInst(VAArgInst &I);
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void visitInstruction(Instruction &I) {
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cerr << I;
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assert(0 && "Instruction not interpretable yet!");
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}
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GenericValue callExternalFunction(Function *F,
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const std::vector<GenericValue> &ArgVals);
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void exitCalled(GenericValue GV);
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void addAtExitHandler(Function *F) {
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AtExitHandlers.push_back(F);
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}
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GenericValue *getFirstVarArg () {
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return &(ECStack.back ().VarArgs[0]);
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}
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//FIXME: private:
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public:
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GenericValue executeGEPOperation(Value *Ptr, gep_type_iterator I,
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gep_type_iterator E, ExecutionContext &SF);
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private: // Helper functions
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// SwitchToNewBasicBlock - Start execution in a new basic block and run any
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// PHI nodes in the top of the block. This is used for intraprocedural
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// control flow.
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//
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void SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF);
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void *getPointerToFunction(Function *F) { return (void*)F; }
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void initializeExecutionEngine();
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void initializeExternalFunctions();
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GenericValue getConstantExprValue(ConstantExpr *CE, ExecutionContext &SF);
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GenericValue getOperandValue(Value *V, ExecutionContext &SF);
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GenericValue executeTruncInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeSExtInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeZExtInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeFPTruncInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeFPExtInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeFPToUIInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeFPToSIInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeUIToFPInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeSIToFPInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executePtrToIntInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeIntToPtrInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeBitCastInst(Value *SrcVal, const Type *DstTy,
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ExecutionContext &SF);
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GenericValue executeCastOperation(Instruction::CastOps opcode, Value *SrcVal,
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const Type *Ty, ExecutionContext &SF);
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void popStackAndReturnValueToCaller(const Type *RetTy, GenericValue Result);
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};
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} // End llvm namespace
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#endif
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