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https://gitlab.com/freepascal.org/fpc/source.git
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117 lines
3.3 KiB
ObjectPascal
117 lines
3.3 KiB
ObjectPascal
{$mode objfpc}
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{$h+}
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program wasi;
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uses classes,ctypes, wasmtime;
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procedure exit_with_error(message : PAnsiChar; error : Pwasmtime_error_t; trap: Pwasm_trap_t); cdecl;
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var
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error_message : Twasm_byte_vec_t ;
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S : AnsiString;
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begin
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Writeln(stderr, 'error: ', message);
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S:='';
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if Trap<>nil then
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begin
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write('Trap: ');
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wasm_trap_message(trap, @error_message);
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wasm_trap_delete(trap);
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end
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else
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begin
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write('Error: ');
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wasmtime_error_message(error, @error_message);
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wasmtime_error_delete(error)
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end;
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SetLength(S,error_message.size);
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Move(error_message.data^,S[1],error_message.size);
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Writeln(stderr, '>>',S,'<<');
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wasm_byte_vec_delete(@error_message);
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halt(1);
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end;
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Var
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engine : Pwasm_engine_t = Nil;
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store : Pwasmtime_store_t = Nil;
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context : Pwasmtime_context_t = Nil;
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F : TMemoryStream;
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wasm : twasm_byte_vec_t;
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module : Pwasmtime_module_t = Nil;
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error : Pwasmtime_error_t = Nil;
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func : Twasmtime_func_t;
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trap : Pwasm_trap_t = Nil;
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linker : Pwasmtime_linker_t;
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wasi_config : Pwasi_config_t;
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status : cint;
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begin
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Writeln('Loading wasm library');
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Loadwasmtime('./'+libwasmtime);
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Writeln('Initializing...');
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engine := wasm_engine_new();
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store:=wasmtime_store_new(engine, nil,nil);
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context:=wasmtime_store_context(store);
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linker:= wasmtime_linker_new(engine);
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error:=wasmtime_linker_define_wasi(linker);
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if (error<>Nil) then
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exit_with_error('failed to define link wasi', error, Nil);
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F:=TMemoryStream.Create;
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try
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F.LoadFromFile('hello.wasm');
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wasm_byte_vec_new_uninitialized(@wasm, F.Size);
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Move(F.Memory^,wasm.data^,F.Size);
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finally
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F.Free;
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end;
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// Now that we've got our binary webassembly we can compile our module.
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Writeln('Compiling module...');
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error:=wasmtime_module_new(engine, Puint8_t(wasm.data), wasm.size, @module);
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wasm_byte_vec_delete(@wasm);
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if (error <> nil) then
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exit_with_error('failed to compile module', error, nil);
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wasi_config:=wasi_config_new();
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if (wasi_config=nil) then
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exit_with_error('failed to create wasi config', Nil, nil);
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wasi_config_inherit_argv(wasi_config);
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wasi_config_inherit_env(wasi_config);
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wasi_config_inherit_stdin(wasi_config);
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wasi_config_inherit_stdout(wasi_config);
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wasi_config_inherit_stderr(wasi_config);
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wasi_config_preopen_dir(wasi_config,PAnsiChar('.'),PAnsiChar('.'));
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error:=wasmtime_context_set_wasi(context, wasi_config);
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if (error<>Nil) then
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exit_with_error('failed to instantiate WASI', error, nil);
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// Instantiate the module
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error:=wasmtime_linker_module(linker, context, Nil, 0, module);
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if (error<>nil) then
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exit_with_error('failed to instantiate module', Nil, Nil);
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error:=wasmtime_linker_get_default(linker, context, nil, 0, @func);
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if (error<>nil) then
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exit_with_error('failed to locate default export for module', error, nil);
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// And call it!
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Writeln('Calling export...');
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error:=wasmtime_func_call(context, @func, nil, 0, nil, 0, @trap);
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if wasmtime_error_exit_status(error,@status)<>0 then
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Writeln('Wasm program exited with status: ',Status)
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else
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exit_with_error('Error while running default export for module', error, trap);
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// Clean up after ourselves at this point
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Writeln('All finished!\n');
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wasmtime_module_delete(module);
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wasmtime_store_delete(store);
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wasm_engine_delete(engine);
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end.
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