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Levels of Abstraction

Levels of Abstraction. Computer Organization. Level of Abstraction. Provides users with concepts/tools to solve problem at that level Implementation hides complex details different implementations using different underlying “machines” are possible. Level of Abstraction -- Example.

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Levels of Abstraction

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  1. Levels of Abstraction Computer Organization

  2. Level of Abstraction • Provides users with concepts/tools to solve problem at that level • Implementation hides complex details • different implementations using different underlying “machines” are possible

  3. Level of Abstraction -- Example • Abstract Data Types • stack, queue, priority queue • Use for building higher level programs • solution search (e.g. maze, TSP) • depth-first, breadth first, branch and bound • Implementation • built on base language: C++, Pascal, Ada, etc. • Can be used to build high level abstraction • generic solution search • event driven simulation language

  4. Virtual Machine 3 Implementation of VM 3 on VM 2 Virtual Machine 2 Implementation of VM 2 on VM 1 Virtual Machine 1 Implementation of VM 1 on VM 0 Virtual Machine 0 Levels of Abstraction

  5. Simulation of Bank Data Structures Data Structures example translation Event Scheduling Simulation Language translation translation Base Language, e.g. C++

  6. High Level Language (HLL) 4 3 2 Compiler (translation) Assembly Language Assembler (translation/mapping to ISA) Operating System (OS) Partial Interpretation (device drivers, etc) Instruction Set Architecture (ISA) 1 0 -1 Hardware Digital Logic Hardware Electronics -- transistors, etc Hardware/Software Interface simple RISC

  7. Assembler 3 2 1 Assembler (translation/mapping to ISA) OS Partial Interpretation (device drivers, etc) ISA Firmware interpreter 1A Microarchitecture Hardware Digital Logic 0 -1 Hardware Electronics -- transistors, etc Hardware/Software Interface more complex architectures

  8. Java (HLL) Java Compiler Java Byte Code (ISA) Interpreter and JIT compiler Java Virtual Machine (JVM) OS Machine ISA Java

  9. Java Byte Code = ISA Java -- Java Chips Java (HLL) Java Compiler Interpreter and JIT compiler JVM (Microarchitecture) Digital Logic

  10. COSC 420 High Level Language (HLL) Compiler (translation) COSC 425 Assembly Language Assembler (translation/mapping to ISA) 1 COSC 301 Operating System (OS) Partial Interpretation (device drivers, etc) Instruction Set Architecture (ISA) 3 Hardware Digital Logic 2 Hardware Electronics -- transistors, etc This Course

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