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
14 #include "llvm/Module.h"
15 #include "llvm/Method.h"
16 #include "llvm/BasicBlock.h"
17 #include "Support/DataTypes.h"
18 #include "llvm/Assembly/CachedWriter.h"
20 extern CachedWriter CW; // Object to accellerate printing of LLVM
22 struct MethodInfo; // Defined in ExecutionAnnotations.h
28 typedef uint64_t PointerTy;
32 unsigned char UByteVal;
34 unsigned short UShortVal;
35 signed short ShortVal;
45 typedef std::vector<GenericValue> ValuePlaneTy;
47 // ExecutionContext struct - This struct represents one stack frame currently
50 struct ExecutionContext {
51 Method *CurMethod; // The currently executing method
52 BasicBlock *CurBB; // The currently executing BB
53 BasicBlock::iterator CurInst; // The next instruction to execute
54 MethodInfo *MethInfo; // The MethInfo annotation for the method
55 std::vector<ValuePlaneTy> Values;// ValuePlanes for each type
57 BasicBlock *PrevBB; // The previous BB or null if in first BB
58 CallInst *Caller; // Holds the call that called subframes.
59 // NULL if main func or debugger invoked fn
62 // Interpreter - This class represents the entirety of the interpreter.
65 Module *CurMod; // The current Module being executed (0 if none)
66 int ExitCode; // The exit code to be returned by the lli util
67 bool Profile; // Profiling enabled?
68 bool Trace; // Tracing enabled?
69 int CurFrame; // The current stack frame being inspected
71 // The runtime stack of executing code. The top of the stack is the current
73 std::vector<ExecutionContext> ECStack;
77 inline ~Interpreter() { CW.setModule(0); delete CurMod; }
79 // getExitCode - return the code that should be the exit code for the lli
81 inline int getExitCode() const { return ExitCode; }
83 // enableProfiling() - Turn profiling on, clear stats?
84 void enableProfiling() { Profile = true; }
85 void enableTracing() { Trace = true; }
87 void handleUserInput();
89 // User Interation Methods...
90 void loadModule(const std::string &Filename);
92 bool callMethod(const std::string &Name); // return true on failure
93 void setBreakpoint(const std::string &Name);
94 void infoValue(const std::string &Name);
95 void print(const std::string &Name);
96 static void print(const Type *Ty, GenericValue V);
97 static void printValue(const Type *Ty, GenericValue V);
99 // Hack until we can parse command line args...
100 bool callMainMethod(const std::string &MainName,
101 const std::vector<std::string> &InputFilename);
103 void list(); // Do the 'list' command
104 void printStackTrace(); // Do the 'backtrace' command
106 // Code execution methods...
107 void callMethod(Method *Meth, const std::vector<GenericValue> &ArgVals);
108 bool executeInstruction(); // Execute one instruction...
110 void stepInstruction(); // Do the 'step' command
111 void nextInstruction(); // Do the 'next' command
112 void run(); // Do the 'run' command
113 void finish(); // Do the 'finish' command
115 // Opcode Implementations
116 void executeCallInst(CallInst *I, ExecutionContext &SF);
117 void executeRetInst(ReturnInst *I, ExecutionContext &SF);
118 void executeBrInst(BranchInst *I, ExecutionContext &SF);
119 void executeAllocInst(AllocationInst *I, ExecutionContext &SF);
120 GenericValue callExternalMethod(Method *Meth,
121 const std::vector<GenericValue> &ArgVals);
122 void exitCalled(GenericValue GV);
124 // getCurrentMethod - Return the currently executing method
125 inline Method *getCurrentMethod() const {
126 return CurFrame < 0 ? 0 : ECStack[CurFrame].CurMethod;
129 // isStopped - Return true if a program is stopped. Return false if no
130 // program is running.
132 inline bool isStopped() const { return !ECStack.empty(); }
134 private: // Helper functions
135 // getCurrentExecutablePath() - Return the directory that the lli executable
138 std::string getCurrentExecutablePath() const;
140 // printCurrentInstruction - Print out the instruction that the virtual PC is
141 // at, or fail silently if no program is running.
143 void printCurrentInstruction();
145 // printStackFrame - Print information about the specified stack frame, or -1
146 // for the default one.
148 void printStackFrame(int FrameNo = -1);
150 // LookupMatchingNames - Search the current method namespace, then the global
151 // namespace looking for values that match the specified name. Return ALL
152 // matches to that name. This is obviously slow, and should only be used for
155 std::vector<Value*> LookupMatchingNames(const std::string &Name);
157 // ChooseOneOption - Prompt the user to choose among the specified options to
158 // pick one value. If no options are provided, emit an error. If a single
159 // option is provided, just return that option.
161 Value *ChooseOneOption(const std::string &Name,
162 const std::vector<Value*> &Opts);
165 void initializeExecutionEngine();
166 void initializeExternalMethods();