Comments (2)
I use Delphi (Object Pascal) so I first had to get a gsc.dll
made in VS2019, then create an gsc.pas
import unit to access the exported functions. The code below is my implementation, seem to work ok. I was able to compile the sdl2 example, save to code.bin
and then load it back into a fresh vm and execute it.
procedure compiler_save_bytecode(aCompiler: compiler_t; aFilename: string);
var
fs: TFileStream;
begin
fs := TFile.Create(aFilename);
fs.Write(aCompiler.&program^, aCompiler.program_size);
FreeAndNil(fs);
end;
function vm_load_bytecode(aVM: Pvm_t; aFilename: string): Boolean;
var
fs: TFileStream;
code: array of Byte;
size: integer;
tag: AnsiString;
begin
tag := AnsiString(TPath.GetFileName(aFilename));
fs := TFile.OpenRead(aFilename);
size := fs.Size;
SetLength(code, size);
fs.ReadData(code, size);
Result := Boolean(vm_add_program(aVM, PByte(code), size, PAnsiChar(tag)) = 0);
FreeAndNil(fs);
code := nil;
end;
Save out bytecode:
const
filename = 'sdl2.gsc';
fps_delta = (1000 div 20);
procedure Test01;
var
c: compiler_t;
r: Integer;
vm: Pvm_t;
begin
r := compiler_init(@c, nil);
r := compiler_add_source_file(@c, filename);
r := compiler_execute(@c);
if r = 0 then
begin
compiler_save_bytecode(c, 'code.bin');
vm := vm_create;
vm_add_program(vm, PByte(c.&program), c.program_size, filename);
compiler_cleanup(@c);
se_addfloat(vm, 1.5);
vm_exec_thread(vm, 'game_update', 1);
vm_exec_thread(vm, 'main', 0);
while (vm_get_num_active_threadrunners(vm) > 0) do
begin
vm_run_active_threads(vm, fps_delta);
sleep(fps_delta);
end;
vm_free(vm);
end
else
writeln('Compiler error');
end;
Load and run bytecode:
procedure test02;
var
vm: Pvm_t;
begin
vm := vm_create;
if vm_load_bytecode(vm, 'code.bin') then
begin
vm_exec_thread(vm, 'main', 0);
while (vm_get_num_active_threadrunners(vm) > 0) do
begin
vm_run_active_threads(vm, fps_delta);
sleep(fps_delta);
end;
end;
vm_free(vm);
end;
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In your second comment, yes that is the way to save and load bytecode. At the moment it also includes the full program with function names and metadata and such.
How does gsc compare to LuaJit in terms of performance.
Performance is nowhere near LuaJIT, since this doesn't have a JIT compiler.
is so sweet and the thread support, ahh marvelous.
They're not real threads, they're coroutines. Just mentioning it incase you weren't aware of this.
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