US 7,065,751 B2 · Program execution device operating based on compressed code

Abstract

A program execution device with a small required memory storage capacity includes: a compressed code storing portion storing a code which has been compressed on a prescribed unit basis of a program described in a prescribed language; an expanding portion connected to the compressed code storing portion for expanding the compressed code stored in the compressed code storing portion; a code storing portion connected to the expanding portion for storing the code expanded by the expanding portion; and an interpreter portion connected to the code storing portion for interpreting and executing the expanded code.

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Claims17

Dependent claims

A program execution device of executing a program described in a non-native code format of a prescribed language, comprising:

a compressed code storing portion storing a code of said program compressed on a prescribed unit basis;
an expanding portion connected to said compressed code storing portion for expanding said compressed code stored in said compressed code storing portion;
a code storing portion connected to said expanding portion for storing the code expanded by said expanding portion;
and
an interpreter portion connected to said code storing portion for interpreting said expanded code for execution in said non-native code format,
wherein said expanding portion expands a first compressed code stored in said compressed code storing portion, stores a first expanded code in said code storing portion and holds said first compressed code in said compressed code storing portion,
after said interpreter portion interprets said first expanded code for execution, said expanding portion expands a second compressed code stored in said compressed code storing portion, overwrites a second expanded code on said first expanded code in said code storing portion and holds said second compressed code in said compressed code storing portion, and
after said interpreter portion interprets said second expanded code for execution, said expanding portion expands said first compressed code stored in said compressed code storing portion and overwrites said first expanded code on said second expanded code in said code storing portion.

5 more elements

A program execution device of executing a program described in an object oriented language, said program being described in a code other than a code native to said program execution device, comprising:

a compressed code storing portion storing a code of said program compressed on a method basis;
an expanding portion connected to said compressed code storing portion for expanding said compressed code;
a code storing portion connected to said expanding portion for storing the code expanded by said expanding portion;
a converting portion connected to said code storing portion for converting said expanded code to a native code;
a native code storing portion connected to said converting portion for storing the native code output from said converting portion;
a native code executing portion connected to said native code storing portion for executing said native code;
and
an interpreter portion for interpreting said expanded code for execution in a non-native code format,
wherein said expanding portion expands a first compressed code stored in said compressed code storing portion, stores a first expanded code in said code storing portion and holds said first compressed code in said compressed code storing portion,
after said converting portion converts said first expanded code to a first native code or said interpreter portion interprets said first expanded coded for execution, said expanding portion expands a second compressed code stored in said compressed code storing portion, overwrites a second expanded code on said first expanded code in said code storing portion and holds said second compressed code in said compressed code storing portion, and
after said converting portion converts said second expanded code to a second native code or said interpreter portion interprets said second expanded code for execution, said expanding portion expands said first compressed code stored in said compressed code storing portion and overwrites said first expanded code on said second expanded code in said code storing portion.

8 more elements

Dependencies are inferred from the claim text.

Description11,088 words

Summary1,311 words

#1. Field of the Invention

#The present invention relates to program execution devices and methods thereof and, more particularly to a program execution device with a small required memory storage capacity for storing data and a method thereof.

#2. Description of the Background Art

Brief description of the drawings26 figures

#FIG. 1 is a block diagram showing a hardware structure of a built-in device according to an embodiment of the present invention.

#FIG. 2 is a diagram shown in conjunction with data stored in an ROM.

#FIG. 3 is a diagram shown in conjunction with data stored in an RAM.

Detailed description9,311 words

#A Java® virtual machine according to the first embodiment of the present invention is implemented with use of a built-in device.

#Referring to FIG. 1, the built-in device includes: a CPU (Central Processing Unit) 2 interpreting and executing a program; an ROM (Read Only Memory) 4 storing a byte code of the program executed by CPU 2; an RAM (Random Access Memory) 8 storing various data used for execution of the program; a user interface 6 for inputting/outputting data with respect to the user; and a bus interconnecting CPU 2, ROM 4, user interface 6 and RAM 8.

#Referring to FIG. 2, ROM 4 has a compressed byte code storage region 12 for storing a byte code of the program described in the Java® language which has been compressed (hereinafter referred to as “compressed byte code”), and a region 14 for storing the other class information.

Facts

Application

10/073,215Filed 13 Feb 2002

Priority

JP 2001-12482423 Apr 2001

Published

US 2004/0015895 A122 Jan 2004

Granted

20 Jun 2006

Term ended

12 Aug 2023

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 545 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification3 codes

G06F 9/445
Arrangements for executing specific programs: program loading or initiating
G06F 9/45516
Abstract machines for program code execution, e.g. Java virtual machine [JVM], interpreters or emulators: runtime code conversion or optimisation
G06F
Computing and data processing

Timeline

23 Apr 2001Priority claimedJP 2001-124824
13 Feb 2002Application filedUS 10/073,215
13 Feb 2002Assigned to Mitsubishi Denki Kabushiki Kaishaassignment of assignor's interest
10 Sep 2003Assigned to Renesas Technology Corp.assignment of assignor's interest
22 Jan 2004PublishedUS 2004/0015895 A1
7 Apr 2004Assigned to Renesas Technology Corp.assignment of assignor's interest
20 Jun 2006GrantedUS 7,065,751 B2
10 Sep 2010Assigned to Renesas Electronics Corporationchange of name
12 Aug 2023Term endedEstimated, includes 545 days of adjustment

Program execution device operating based on compressed code

Life of this patent

Program execution device operating based on compressed code

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims17

Description11,088 words

Classification3 codes

Life of this patent

Drawings

Description11,088 words