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JNI binding generator (runtime)
GlueGen Code Generator
JogAmp GlueGen Code Generator
GlueGen Data Type Mapping
Gluegen has build-in types (terminal symbols) for:
type java bits native bits type signed origin x32 x64 void 0 0 0 void void ANSI-C char 8 8 8 integer any ANSI-C short 16 16 16 integer any ANSI-C int 32 32 32 integer any ANSI-C long 64 32 321 integer any ANSI-C - Windows long 64 32 64 integer any ANSI-C - Unix float 32 32 32 float signed ANSI-C double 64 64 64 double signed ANSI-C __int32 32 32 32 integer any windows __int64 64 64 64 integer any windows int8_t 8 8 8 integer signed stdint.h uint8_t 8 8 8 integer unsigned stdint.h int16_t 16 16 16 integer signed stdint.h uint16_t 16 16 16 integer unsigned stdint.h int32_t 32 32 32 integer signed stdint.h uint32_t 32 32 32 integer unsigned stdint.h int64_t 64 64 64 integer signed stdint.h uint64_t 64 64 64 integer unsigned stdint.h intptr_t 64 32 64 integer signed stdint.h uintptr_t 64 32 64 integer unsigned stdint.h ptrdiff_t 64 32 64 integer signed stddef.h size_t 64 32 64 integer unsigned stddef.h wchar_t 32 32 32 integer signed stddef.h
Warning: Try to avoid unspecified bit sized types, especially long, since it differs on Unix and Windows!
Notes:
- Type long will result in broken code on Windows, since we don't differentiate the OS and it's bit size is ambiguous.
- Anonymous void-pointer void* are mapped to NIO Buffer.
- Pointers to pointer-size types like intptr_t*, uintptr_t*, ptrdiff_t* and size_t* are mapped to PointerBuffer,
to reflect the architecture depending storage size.
GlueGen Internal Alignment for Compound Data
In general, depending on CPU and it's configuration (OS), alignment is set up
for each type (char, short, int, long, ..).
Compounds (structures) are aligned naturally, i.e. their inner components are aligned
and are itself aligned to it's largest element.
See:
- Wikipedia Data Structure Alignment
- Wikipedia Data Structure Alignment - Padding
- Viva64 Data Alignment
- Apple: Darwin 64bit Porting - Data Type Size & Alignment
Simple alignment arithmetic
remainder = offset % alignment
since alignment is a multiple of 2 -> x % 2n == x & (2n - 1)
remainder = offset & ( alignment - 1 )
padding = (remainder > 0) ? alignment - remainder : 0 ;
aligned_offset = offset + padding ;
Type Size & Alignment for x86, x86_64, armv6l-32bit-eabi and Window(mingw/mingw64)
Runtime query is implemented as follows:
typedef struct {
char fill; // nibble one byte
// padding to align s1: padding_0
type_t s1; //
} test_struct_type_t;
padding_0 = sizeof(test_struct_type_t) - sizeof(type_t) - sizeof(char) ;
alignmentOf(type_t) = sizeof(test_struct_type_t) - sizeof(type_t) ;
type 32 bits 64 bits size alignment size alignment char 1 1 1 1 short 2 2 2 2 int 4 4 4 4 float 4 4 4 4 long 4 4 8†,4∗ 8†,4∗ pointer 4 4 8 8 long long 8 4†,8∗+ 8 8 double 8 4†,8∗+ 8 8 long double 12†∗,8+,16- 4†∗,8+,16- 16 16
† Linux, Darwin
+armv7l-eabi
- MacOsX-32bit-gcc4
∗ Windows
GlueGen Platform Header Files
GlueGen provides convenient platform headers,
which can be included in your C header files for native compilation and GlueGen code generation.
Example:
#include <gluegen_stdint.h>
#include <gluegen_stddef.h>
uint64_t test64;
size_t size1;
ptrdiff_t ptr1;
To compile this file you have to include the following folder to your compilers system includes, ie -I:
gluegen/make/stub_includes/platform
To generate code for this file you have to include the following folder to your GlueGen includeRefid element:
gluegen/make/stub_includes/gluegen
GlueGen Pre-Defined Macros
To identity a GlueGen code generation run, GlueGen defines the following macros:
#define __GLUEGEN__ 2