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//===- InferiorProcess.h - Represent the program being debugged -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the InferiorProcess class, which is used to represent,
// inspect, and manipulate a process under the control of the LLVM debugger.
//
// This is an abstract class which should allow various different types of
// implementations. Initially we implement a unix specific debugger backend
// that does not require code generator support, but we could eventually use
// code generator support with ptrace, support windows based targets, supported
// remote targets, etc.
//
// If the inferior process unexpectedly dies, an attempt to communicate with it
// will cause an InferiorProcessDead exception to be thrown, indicating the exit
// code of the process. When this occurs, no methods on the InferiorProcess
// class should be called except for the destructor.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGGER_INFERIORPROCESS_H
#define LLVM_DEBUGGER_INFERIORPROCESS_H
#include <string>
#include <vector>
namespace llvm {
class Module;
class GlobalVariable;
/// InferiorProcessDead exception - This class is thrown by methods that
/// communicate with the interior process if the process unexpectedly exits or
/// dies. The instance variable indicates what the exit code of the process
/// was, or -1 if unknown.
class InferiorProcessDead {
int ExitCode;
public:
InferiorProcessDead(int EC) : ExitCode(EC) {}
int getExitCode() const { return ExitCode; }
};
/// InferiorProcess class - This class represents the process being debugged
/// by the debugger. Objects of this class should not be stack allocated,
/// because the destructor can throw exceptions.
///
class InferiorProcess {
Module *M;
protected:
InferiorProcess(Module *m) : M(m) {}
public:
/// create - Create an inferior process of the specified module, and
/// stop it at the first opportunity. If there is a problem starting the
/// program (for example, it has no main), throw an exception.
static InferiorProcess *create(Module *M,
const std::vector<std::string> &Arguments,
const char * const *envp);
// InferiorProcess destructor - Kill the current process. If something
// terrible happens, we throw an exception from the destructor.
virtual ~InferiorProcess() {}
//===------------------------------------------------------------------===//
// Status methods - These methods return information about the currently
// stopped process.
//
/// getStatus - Return a status message that is specific to the current type
/// of inferior process that is created. This can return things like the
/// PID of the inferior or other potentially interesting things.
virtual std::string getStatus() const {
return "";
}
//===------------------------------------------------------------------===//
// Methods for inspecting the call stack.
//
/// getPreviousFrame - Given the descriptor for the current stack frame,
/// return the descriptor for the caller frame. This returns null when it
/// runs out of frames. If Frame is null, the initial frame should be
/// returned.
virtual void *getPreviousFrame(void *Frame) const = 0;
/// getSubprogramDesc - Return the subprogram descriptor for the current
/// stack frame.
virtual const GlobalVariable *getSubprogramDesc(void *Frame) const = 0;
/// getFrameLocation - This method returns the source location where each
/// stack frame is stopped.
virtual void getFrameLocation(void *Frame, unsigned &LineNo,
unsigned &ColNo,
const GlobalVariable *&SourceDesc) const = 0;
//===------------------------------------------------------------------===//
// Methods for manipulating breakpoints.
//
/// addBreakpoint - This method adds a breakpoint at the specified line,
/// column, and source file, and returns a unique identifier for it.
///
/// It is up to the debugger to determine whether or not there is actually a
/// stop-point that corresponds with the specified location.
virtual unsigned addBreakpoint(unsigned LineNo, unsigned ColNo,
const GlobalVariable *SourceDesc) = 0;
/// removeBreakpoint - This deletes the breakpoint with the specified ID
/// number.
virtual void removeBreakpoint(unsigned ID) = 0;
//===------------------------------------------------------------------===//
// Execution methods - These methods cause the program to continue execution
// by some amount. If the program successfully stops, this returns.
// Otherwise, if the program unexpectedly terminates, an InferiorProcessDead
// exception is thrown.
//
/// stepProgram - Implement the 'step' command, continuing execution until
/// the next possible stop point.
virtual void stepProgram() = 0;
/// finishProgram - Implement the 'finish' command, continuing execution
/// until the current function returns.
virtual void finishProgram(void *Frame) = 0;
/// contProgram - Implement the 'cont' command, continuing execution until
/// a breakpoint is encountered.
virtual void contProgram() = 0;
};
} // end namespace llvm
#endif
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