Panama 4 Newbies

This is a quick intro to OpenJDK's Project Panama.

• Part 1 https://foojay.io/today/project-panama-for-newbies-part-1

Part 1 - Learning jextract and C strings, primitives and arrays types

Clean up executables and generated code from jextract.

$ ./clean.sh

Compile a Hello World C program (optional)

$ ./compile_helloworld.c.sh

Run Hello World C program (optional)

$ ./a.out

Generate Java Panama code (from stdio.h)

$ jextract_stdio.h.sh

Run Java Panama Hello World using C functions

$ ./run_HelloWorld.java.sh

Output shows the following:

Hello World! Panama style

Run Java Panama program creating C double.

$ ./run_Primitive.java.sh

Output shows the following:

A slice of 3.141593 

Run Java Panama program creating an array of type C double.

$ ./run_PrimitiveArray.java.sh

Output shows the following:

An array of data
 1.000000  2.000000  3.000000  4.000000 
 1.000000  1.000000  1.000000  1.000000 
 3.000000  4.000000  5.000000  6.000000 
 5.000000  6.000000  7.000000  8.000000