- #DYNAMIC STORAGE ALLOCATION IN COMPILER DESIGN PPT SOFTWARE#
- #DYNAMIC STORAGE ALLOCATION IN COMPILER DESIGN PPT CODE#
When a called procedure is executed, it returns the control back to the caller. We assume that the program control flows in a sequential manner and when a procedure is called, its control is transferred to the called procedure. At this time, the activation record of the called procedure is stored on the stack. When a procedure calls another procedure, the execution of the caller is suspended until the called procedure finishes execution. Whenever a procedure is executed, its activation record is stored on the stack, also known as control stack. Stores actual parameters, i.e., parameters which are used to send input to the called procedure. Stores the information of data which is outside the local scope. Stores the address of activation record of the caller procedure. Stores machine status such as Registers, Program Counter etc., before the procedure is called. Stores local data of the called procedure. Stores temporary and intermediate values of an expression. An activation record may contain the following units (depending upon the source language used). An activation record contains all the necessary information required to call a procedure. The execution of a procedure is called its activation. The procedure identifier and the sequence of finite instructions inside it make up the body of the procedure. A procedure has a start and an end delimiter and everything inside it is called the body of the procedure. Instructions in a procedure are executed sequentially. Activation TreesĪ program is a sequence of instructions combined into a number of procedures. It takes care of memory allocation and de-allocation while the program is being executed. Runtime support system is a package, mostly generated with the executable program itself and facilitates the process communication between the process and the runtime environment.
#DYNAMIC STORAGE ALLOCATION IN COMPILER DESIGN PPT SOFTWARE#
Runtime environment is a state of the target machine, which may include software libraries, environment variables, etc., to provide services to the processes running in the system. A program contains names for procedures, identifiers etc., that require mapping with the actual memory location at runtime.īy runtime, we mean a program in execution. A program needs memory resources to execute instructions.
#DYNAMIC STORAGE ALLOCATION IN COMPILER DESIGN PPT CODE#
A program as a source code is merely a collection of text (code, statements etc.) and to make it alive, it requires actions to be performed on the target machine.