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0a14411bc1
* Add -O flag to ragg2 as an alias for -o a.out or -o <file> (without extension) * Add rabin2 -M (get main) for Java Class files * Add emit_trace (code tracer) for r_egg. useful to debug - ragg2 -a trace hello.r - Add emit->jmp() function pointer and emit->retvar - many fixes in function calls and definitions - Added support for 'break;' 'break();' and 'goto();' - Added .ret variable as an alias for eax, rax or r0
RCC : Ralang/Relocatable Code Compiler
======================================
NASM support
------------
remove comments | grep -v '^#'
remove ptr
section .text \n global main
Compiler pipeline: the picture
------------------------------
spp : Simple preprocessor
| - includes and conditional compilation
|
ralang : The language
| - imperative and simple
|
macros : architecture independent assembly-like macro-based
| - provides calling conventions and syscall definitions
|
assembly : macros are then converted into assembly
| - specific for an OS/arch
V
gas/rasm2 : assembler compatible with GNU assembler and r2 asm
|
V
binary : the executable, relocatable code
- inject it for fun and profit
The language
------------
The ralang language aims to be an imperative high-level language providing
limited flexibility with some basic rules for parsing to simplify the
interpretation of the code.
Check t/ for examples
The compiler is a state machine where every character can modify the
internal state of itself while directly producing assembly code.
A gramatical parser is nothing more or nothing less than that. The language
must only permit constructions that can be directly mapped to machine code.
write($1, .var0, .var4);
Strings are encoded in the stack at runtime, variable access is done
explicitly by giving the delta offset against the base register.
.var0 = "Hello";
Access modifiers:
$1024 = numeric value
.var0 = get contents of variable
&.var0 = get address of variable
*.var0 = get contents of place where the var points to
--pancake