# gc support

we now support copy collection garbage collection algorithm, the main code
is under runtime/gc.c

## ATTENTION

mac osx\'s clang and linux\'s gcc layout stack differently.

In mac\'s clang, stack layout like following:

---------------------------------------------------> low address
| this | arg1 | arg2 | arg3 | ret | ebp |  locals?
----------------------------------------------------

whereas in linux\'s gcc, stack layout like following:

---------------------------------------------------> low address
| arg3 | arg2 | arg1 | this | ret | ebp |  locals?
----------------------------------------------------

our code got this situation covered.

# for codegen option

## compile to C programming language

use

    $ java Tiger -codegen C T.java

the program will compile to C and generate C file under "/tmp/" (so this won't work in Windows system, only after you changed the path in codegen.C.PrettyPrintVisitor.java).

if you want compile to executable directly you could use following command:

    $ java Tiger -codegen C T.java -auto

## compile to java byte code

use

    $ java Tiger -codegen bytecode T.java

and it will generate some *.j file in your current working directory, then
compile *.j into class file using:

    $ java -jar ../jasmin.jar *.j

this will generate *.class file in your current working directory, run the
program using

    $ java Main

replace Main with your class with main method.