source: liacs/coco/assignment4/StackFrameManager.h@ 422

/*

 * StackFrameManager.h - Declaration of the StackFrameManager class

 *

 * Part of the assignment of the Compiler Construction course

 * LIACS, Leiden University

 */



#ifndef _STACKFRAMEMANAGER_H_

#define _STACKFRAMEMANAGER_H_



#include <cstdio>

#include "SymbolTable.h"

#include "AssemblerCode.h"



// This class gathers information about the stack frame (also known as

// an activation record) of a subprogram and provides methods to generate

// code based on the gathered information.

class StackFrameManager {

  public:

    // Constructor:

    StackFrameManager(AssemblerCode& ac);



    // Destructor:

    ~StackFrameManager();



    // Analyzes a subprogram and computes the stack frame layout.

    // This function should always be called once for a subprogram before

    // calls to GeneratePrologue/Epilogue or GenerateLocalAddress are made.

    void AnalyzeSubprogram(SymbolTable * symtab, Symbol * subprogram);



    // Generates the code that sets up the stack frame at the entry point of a

    // subprogram.

    void GeneratePrologue(FILE * out);



    // Generates the code that discards the stack frame at the leaving point of

    // a subprogram.

    void GenerateEpilogue(FILE * out);



    // Generates a $fp-relative address for a local variable or parameter.

    // The output can be used directly as an operand for load/store instructions.

    void GenerateLocalAddress(FILE * out, Symbol * sym);



    // ... your own public members and methods ...



  private:



    // The current subprogram

    Symbol * currentSubprogram;



    AssemblerCode& ac;



    int frameSize; // the size of the stack frame for this subprogram

    int localFrameSize; // the size of stack frame without parameters

    int raOffset; // the offset on the stack frame for the return address

    int fpOffset; // the offset on the stack frame for the old frame pointer

    int rvOffset; // the offset on the stack frame for the return value

};





#endif