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Bytecode basics
A first look at the bytecodes of the Java virtual machine
Page 6 of 10
| Opcode | Operand(s) | Description |
|---|---|---|
iload |
vindex | pushes int from local variable position vindex |
iload_0 |
(none) | pushes int from local variable position zero |
iload_1 |
(none) | pushes int from local variable position one |
iload_2 |
(none) | pushes int from local variable position two |
iload_3 |
(none) | pushes int from local variable position three |
fload |
vindex | pushes float from local variable position vindex |
fload_0 |
(none) | pushes float from local variable position zero |
fload_1 |
(none) | pushes float from local variable position one |
fload_2 |
(none) | pushes float from local variable position two |
fload_3 |
(none) | pushes float from local variable position three |
The next table shows the instructions that push local variables of type long and double onto the stack. These instructions move 64 bits from the local variable section of the stack frame to the operand section.
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- "The Java Virtual Machine Specification" represents the official word from Sun.
http://java.sun.com/1.0alpha3/doc/vmspec/vmspec_1.html - When it comes out, the book The Java Virtual Machine Specification, by Tim Lindholm and Frank Yellin (ISBN 0-201-63452-X), will be the definitive JVM reference. This book is part of The Java Series, from Addison-Wesley.
http://www.aw.com/cp/lindholm-yellin.html
http://www.aw.com/cp/javaseries.html
- Previous Under The Hood articles:
- The lean, mean virtual machine -- Gives an introduction to the Java virtual machine. Look here to see how the garbage collected heap fits in with the other parts of the JVM.
- The Java class file lifestyle -- Gives an overview to the Java class file, the file format into which all Java programs are compiled.
- Java's garbage-collected heap -- Gives an overview of garbage collection in general and the garbage-collected heap of the JVM in particular.
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