1 //===-- Interpreter.h ------------------------------------------*- C++ -*--===//
3 // This header file defines the interpreter structure
5 //===----------------------------------------------------------------------===//
7 #ifndef LLI_INTERPRETER_H
8 #define LLI_INTERPRETER_H
10 // Uncomment this line to enable profiling of structure field accesses.
11 //#define PROFILE_STRUCTURE_FIELDS 1
13 #include "../ExecutionEngine.h"
14 #include "Support/DataTypes.h"
15 #include "llvm/Assembly/CachedWriter.h"
16 #include "llvm/Target/TargetData.h"
17 #include "llvm/BasicBlock.h"
18 #include "../GenericValue.h"
20 extern CachedWriter CW; // Object to accelerate printing of LLVM
22 struct MethodInfo; // Defined in ExecutionAnnotations.h
30 // AllocaHolder - Object to track all of the blocks of memory allocated by
31 // alloca. When the function returns, this object is poped off the execution
32 // stack, which causes the dtor to be run, which frees all the alloca'd memory.
35 friend class AllocaHolderHandle;
36 std::vector<void*> Allocations;
39 AllocaHolder() : RefCnt(0) {}
40 void add(void *mem) { Allocations.push_back(mem); }
42 for (unsigned i = 0; i < Allocations.size(); ++i)
47 // AllocaHolderHandle gives AllocaHolder value semantics so we can stick it into
50 class AllocaHolderHandle {
53 AllocaHolderHandle() : H(new AllocaHolder()) { H->RefCnt++; }
54 AllocaHolderHandle(const AllocaHolderHandle &AH) : H(AH.H) { H->RefCnt++; }
55 ~AllocaHolderHandle() { if (--H->RefCnt == 0) delete H; }
57 void add(void *mem) { H->add(mem); }
60 typedef std::vector<GenericValue> ValuePlaneTy;
62 // ExecutionContext struct - This struct represents one stack frame currently
65 struct ExecutionContext {
66 Function *CurMethod; // The currently executing function
67 BasicBlock *CurBB; // The currently executing BB
68 BasicBlock::iterator CurInst; // The next instruction to execute
69 MethodInfo *MethInfo; // The MethInfo annotation for the function
70 std::vector<ValuePlaneTy> Values;// ValuePlanes for each type
72 BasicBlock *PrevBB; // The previous BB or null if in first BB
73 CallInst *Caller; // Holds the call that called subframes.
74 // NULL if main func or debugger invoked fn
75 AllocaHolderHandle Allocas; // Track memory allocated by alloca
78 // Interpreter - This class represents the entirety of the interpreter.
80 class Interpreter : public ExecutionEngine {
81 int ExitCode; // The exit code to be returned by the lli util
82 bool Debug; // Debug mode enabled?
83 bool Profile; // Profiling enabled?
84 bool Trace; // Tracing enabled?
85 int CurFrame; // The current stack frame being inspected
88 // The runtime stack of executing code. The top of the stack is the current
90 std::vector<ExecutionContext> ECStack;
93 Interpreter(Module *M, unsigned Config, bool DebugMode, bool TraceMode);
94 inline ~Interpreter() { CW.setModule(0); }
96 // getExitCode - return the code that should be the exit code for the lli
98 inline int getExitCode() const { return ExitCode; }
100 /// run - Start execution with the specified function and arguments.
102 virtual int run(const std::string &FnName,
103 const std::vector<std::string> &Args);
106 // enableProfiling() - Turn profiling on, clear stats?
107 void enableProfiling() { Profile = true; }
108 void enableTracing() { Trace = true; }
110 void handleUserInput();
112 // User Interation Methods...
113 bool callMethod(const std::string &Name); // return true on failure
114 void setBreakpoint(const std::string &Name);
115 void infoValue(const std::string &Name);
116 void print(const std::string &Name);
117 static void print(const Type *Ty, GenericValue V);
118 static void printValue(const Type *Ty, GenericValue V);
120 bool callMainMethod(const std::string &MainName,
121 const std::vector<std::string> &InputFilename);
123 void list(); // Do the 'list' command
124 void printStackTrace(); // Do the 'backtrace' command
126 // Code execution methods...
127 void callMethod(Function *F, const std::vector<GenericValue> &ArgVals);
128 bool executeInstruction(); // Execute one instruction...
130 void stepInstruction(); // Do the 'step' command
131 void nextInstruction(); // Do the 'next' command
132 void run(); // Do the 'run' command
133 void finish(); // Do the 'finish' command
135 // Opcode Implementations
136 void executeCallInst(CallInst &I, ExecutionContext &SF);
137 void executeRetInst(ReturnInst &I, ExecutionContext &SF);
138 void executeBrInst(BranchInst &I, ExecutionContext &SF);
139 void executeAllocInst(AllocationInst &I, ExecutionContext &SF);
140 GenericValue callExternalMethod(Function *F,
141 const std::vector<GenericValue> &ArgVals);
142 void exitCalled(GenericValue GV);
144 // getCurrentMethod - Return the currently executing method
145 inline Function *getCurrentMethod() const {
146 return CurFrame < 0 ? 0 : ECStack[CurFrame].CurMethod;
149 // isStopped - Return true if a program is stopped. Return false if no
150 // program is running.
152 inline bool isStopped() const { return !ECStack.empty(); }
156 GenericValue executeGEPOperation(Value *Ptr, User::op_iterator I,
157 User::op_iterator E, ExecutionContext &SF);
158 void executeLoadInst(LoadInst &I, ExecutionContext &SF);
159 void executeStoreInst(StoreInst &I, ExecutionContext &SF);
162 private: // Helper functions
163 void *getPointerToFunction(const Function *F) { return (void*)F; }
165 // getCurrentExecutablePath() - Return the directory that the lli executable
168 std::string getCurrentExecutablePath() const;
170 // printCurrentInstruction - Print out the instruction that the virtual PC is
171 // at, or fail silently if no program is running.
173 void printCurrentInstruction();
175 // printStackFrame - Print information about the specified stack frame, or -1
176 // for the default one.
178 void printStackFrame(int FrameNo = -1);
180 // LookupMatchingNames - Search the current function namespace, then the
181 // global namespace looking for values that match the specified name. Return
182 // ALL matches to that name. This is obviously slow, and should only be used
183 // for user interaction.
185 std::vector<Value*> LookupMatchingNames(const std::string &Name);
187 // ChooseOneOption - Prompt the user to choose among the specified options to
188 // pick one value. If no options are provided, emit an error. If a single
189 // option is provided, just return that option.
191 Value *ChooseOneOption(const std::string &Name,
192 const std::vector<Value*> &Opts);
195 void initializeExecutionEngine();
196 void initializeExternalMethods();