improved readme, added asciinema demo

for now cosmo will disassemble each script before running

.github/workflows/check_build.yaml

@@ -19,9 +19,9 @@ jobs:
         with:
           submodules: recursive
       - name: CMake
-        run: cmake -B build
+        run: cmake -B build -DCMAKE_BUILD_TYPE=Release
       - name: Build
-        run: cmake --build build
+        run: cmake --build build --config Release
       - name: Upload build artifact
         uses: actions/upload-artifact@v2
         with:

Makefile

@@ -1,7 +1,7 @@
 # make clean && make && ./bin/cosmo
 
 CC=clang
-CFLAGS=-fPIE -Wall -Isrc -O3 -std=c99 #-g -fsanitize=address
+CFLAGS=-fPIE -Wall -Isrc -O3 #-g -fsanitize=address
 LDFLAGS=-lm #-fsanitize=address
 OUT=bin/cosmo
 

README.md

@@ -1,7 +1,4 @@
 # Cosmo
-[![Check Build](https://github.com/CPunch/Cosmo/actions/workflows/check_build.yaml/badge.svg?branch=main)](https://github.com/CPunch/Cosmo/actions/workflows/check_build.yaml)
-
-## Usage
 
 ```
 Usage: ./bin/cosmo [-clsr] [args]
@@ -13,6 +10,13 @@ available options are:
 -r              start the repl
 ```
 
+<p align="center">
+    <a href="https://github.com/CPunch/Cosmo/actions/workflows/check_build.yaml"><img src="https://github.com/CPunch/Cosmo/actions/workflows/check_build.yaml/badge.svg?branch=main" alt="Workflow"></a>
+    <a href="https://github.com/CPunch/Cosmo/blob/main/LICENSE.md"><img src="https://img.shields.io/github/license/CPunch/Cosmo" alt="License"></a>
+    <br>
+    <a href="https://asciinema.org/a/629355" target="_blank"><img src="https://asciinema.org/a/629355.svg" /></a>
+</p>
+
 ## What is a 'cosmo'?
 
 Cosmo is a portable scripting language loosely based off of Lua. Cosmo easily allows the user to extend the language through the use of Proto objects, which describe the behavior of Objects. For example the following is a simple Vector Proto which describes behavior for a Vector-like object.

docs/stdlib.md

@@ -59,7 +59,14 @@ Includes functions that interact with the operating system.
 
 | Name         | Type                                             | Behavior                                                                 | Example                  |
 | ------------ | ------------------------------------------------ | ------------------------------------------------------------------------ | ------------------------ |
-| os.read      | `(path<string>)` -> `<string>` or `<nil>`        | Returns a file's contents or nil if it doesn't exist/an error occurred   | `os.read("path")` -> `Hello, World!`|
+| os.open | `(path<string>[, mode<string>])` -> `<bool>, <obj>` | Opens a file at `path` and returns a file object. Specify mode to be "r" or "w" optionally, defaults to "r". | `os.open("test.txt")` -> `true, <file>` |
 | os.time      | `()` -> `<number>`                               | Returns the system time in Epoch format                                  | `os.time()` -> `1.61691e+09` |
 | os.system    | `(cmd<string>)` -> `<number>`                    | Runs a system command as if it were a terminal and returns the exit code | `os.system("mkdir test")` -> `0`  |
-> -> means 'returns'
+> -> means 'returns'
+
+File objects have the following methods:
+| Name         | Type                                             | Behavior                                                                 | Example                  |
+| ------------ | ------------------------------------------------ | ------------------------------------------------------------------------ | ------------------------ |
+| file:read | `(amt<number> or "a")` -> `<string>` | Reads `amt` bytes from the file and returns them as a string. If `"a"` is passed, the entire file is read. | `file:read("a")` -> `"Hello world!"` |
+| file:write | `(data<string>)` -> `<nil>` | Writes `data` to file. | `file:write("hello world!")` -> `<nil>` |
+> -> means 'returns'

examples/reader.cosmo

@@ -0,0 +1,6 @@
+local err, file = os.open("LICENSE.md")
+if err then
+  print("failed to open file")
+end
+
+print(file:read("a"))

examples/writer.cosmo

@@ -0,0 +1,6 @@
+local err, file = os.open("test.md", "w")
+if err then
+  print("failed to open file")
+end
+
+file:write("hello world")

main.c

@@ -50,13 +50,24 @@ static bool interpret(CState *state, const char *script, const char *mod)
 
     // cosmoV_compileString pushes the result onto the stack (COBJ_ERROR or COBJ_CLOSURE)
     if (cosmoV_compileString(state, script, mod)) {
-        // 0 args being passed, 0 results expected
+        cosmoG_disassemble(cosmoV_readClosure(*cosmoV_getTop(state, 0)));
-        if (!cosmoV_pcall(state, 0, 0)) {
+        if (!cosmoV_pcall(state, 0, 1)) {
-            cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
+            cosmoV_printBacktrace(state, cosmoV_readError(*cosmoV_pop(state)));
             return false;
         }
+
+        // if the result is nil, we don't print it
+        if (IS_NIL(*cosmoV_getTop(state, 0))) {
+            cosmoV_pop(state);
+            return true;
+        }
+
+        // otherwise, we print the result
+        cosmoV_printValue(*cosmoV_getTop(state, 0));
+        printf("\n");
+        cosmoV_pop(state);
     } else {
-        cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
+        cosmoV_printBacktrace(state, cosmoV_readError(*cosmoV_pop(state)));
         return false;
     }
 
@@ -75,7 +86,7 @@ static void repl(CState *state)
     cosmoV_pushString(state, "input");
     cosmoV_pushCFunction(state, cosmoB_input);
 
-    cosmoV_register(state, 2);
+    cosmoV_addGlobals(state, 2);
 
     while (_ACTIVE) {
         if (!(line = linenoise("> "))) { // better than gets()
@@ -84,7 +95,7 @@ static void repl(CState *state)
 
         linenoiseHistoryAdd(line);
         interpret(state, line, "REPL");
-        linenoiseFree(line);
+        free(line);
     }
 }
 
@@ -130,7 +141,7 @@ static bool runFile(CState *state, const char *fileName)
     cosmoV_pushString(state, "input");
     cosmoV_pushCFunction(state, cosmoB_input);
 
-    cosmoV_register(state, 1);
+    cosmoV_addGlobals(state, 1);
 
     ret = interpret(state, script, fileName);
 
@@ -158,7 +169,7 @@ void compileScript(CState *state, const char *in, const char *out)
         CObjFunction *func = cosmoV_readClosure(*cosmoV_getTop(state, 0))->function;
         cosmoD_dump(state, func, fileWriter, (void *)fout);
     } else {
-        cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
+        cosmoV_printBacktrace(state, cosmoV_readError(*cosmoV_pop(state)));
     }
 
     free(script);
@@ -171,13 +182,13 @@ void loadScript(CState *state, const char *in)
 {
     FILE *file = fopen(in, "rb");
     if (!cosmoV_undump(state, fileReader, file)) {
-        cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
+        cosmoV_printBacktrace(state, cosmoV_readError(*cosmoV_pop(state)));
         return;
     };
 
     printf("[!] loaded %s!\n", in);
     if (!cosmoV_pcall(state, 0, 0))
-        cosmoV_printError(state, cosmoV_readError(*cosmoV_pop(state)));
+        cosmoV_printBacktrace(state, cosmoV_readError(*cosmoV_pop(state)));
 
     fclose(file);
 }

src/cbaselib.c

@@ -18,7 +18,7 @@ int cosmoB_print(CState *state, int nargs, CValue *args)
             CObjString *str = cosmoV_toString(state, args[i]);
             printf("%s", cosmoO_readCString(str));
         } else { // else, thats pretty expensive for primitives, just print the raw value
-            printValue(args[i]);
+            cosmoV_printValue(args[i]);
         }
     }
     printf("\n");
@@ -69,7 +69,7 @@ int cosmoB_pcall(CState *state, int nargs, CValue *args)
     bool res = cosmoV_pcall(state, nargs - 1, 1);
 
     // insert false before the result
-    cosmo_insert(state, 0, cosmoV_newBoolean(res));
+    cosmoV_insert(state, 0, cosmoV_newBoolean(res));
     return 2;
 }
 
@@ -105,7 +105,7 @@ int cosmoB_loadstring(CState *state, int nargs, CValue *args)
     CObjString *str = cosmoV_readString(args[0]);
     bool res = cosmoV_compileString(state, str->str, "");
 
-    cosmo_insert(state, 0, cosmoV_newBoolean(res));
+    cosmoV_insert(state, 0, cosmoV_newBoolean(res));
     return 2; // <boolean>, <closure> or <error>
 }
 
@@ -139,7 +139,7 @@ void cosmoB_loadLibrary(CState *state)
     }
 
     // register all the pushed c functions and the strings as globals
-    cosmoV_register(state, i);
+    cosmoV_addGlobals(state, i);
 
     // load other libraries
     cosmoB_loadObjLib(state);
@@ -168,8 +168,43 @@ int cosmoB_ogetProto(CState *state, int nargs, CValue *args)
     if (nargs != 1)
         cosmoV_error(state, "Expected 1 argument, got %d!", nargs);
 
-    cosmoV_pushRef(state, (CObj *)cosmoV_readObject(args[0])->_obj.proto); // just return the proto
+    if (!IS_REF(args[0])) {
+        cosmoV_typeError(state, "__getter.__proto", "<object>", "%s", cosmoV_typeStr(args[0]));
+    }
 
+    CObj *proto = (CObj *)cosmoV_readRef(args[0])->proto;
+    if (proto == NULL) {
+        cosmoV_pushNil(state);
+        return 1;
+    }
+
+    cosmoV_pushRef(state, proto); // just return the proto
+    return 1;                     // 1 result
+}
+
+int cosmoB_ogetKeys(CState *state, int nargs, CValue *args)
+{
+    if (nargs != 1)
+        cosmoV_error(state, "Expected 1 argument, got %d!", nargs);
+
+    if (!IS_OBJECT(args[0])) {
+        cosmoV_typeError(state, "object.__keys", "<object>", "%s", cosmoV_typeStr(args[0]));
+    }
+
+    // push keys
+    CObjObject *obj = cosmoV_readObject(args[0]);
+    int cap = cosmoT_getCapacity(&obj->tbl);
+    int indx = 0;
+    for (int i = 0; i < cap; i++) {
+        CTableEntry *entry = &obj->tbl.table[i];
+        if (IS_NIL(entry->key))
+            continue;
+
+        cosmoV_pushNumber(state, indx++);
+        cosmoV_pushValue(state, entry->key);
+    }
+
+    cosmoV_makeTable(state, indx);
     return 1; // 1 result
 }
 
@@ -194,9 +229,9 @@ int cosmoB_oisChild(CState *state, int nargs, CValue *args)
 
 COSMO_API void cosmoB_loadObjLib(CState *state)
 {
-    const char *identifiers[] = {"ischild"};
+    const char *identifiers[] = {"ischild", "keys"};
 
-    CosmoCFunction objLib[] = {cosmoB_oisChild};
+    CosmoCFunction objLib[] = {cosmoB_oisChild, cosmoB_ogetKeys};
 
     // make object library object
     cosmoV_pushString(state, "object");
@@ -204,7 +239,7 @@ COSMO_API void cosmoB_loadObjLib(CState *state)
     // make __getter object for debug proto
     cosmoV_pushString(state, "__getter");
 
-    // key & value pair
+    // key & value pairs
     cosmoV_pushString(state, "__proto");           // key
     cosmoV_pushCFunction(state, cosmoB_ogetProto); // value
 
@@ -230,52 +265,176 @@ COSMO_API void cosmoB_loadObjLib(CState *state)
     cosmoV_registerProtoObject(state, COBJ_OBJECT, obj);
 
     // register "object" to the global table
-    cosmoV_register(state, 1);
+    cosmoV_addGlobals(state, 1);
 }
 
 // ================================================================ [OS.*]
 
-// os.read()
+int fileB_read(CState *state, int nargs, CValue *args)
-int cosmoB_osRead(CState *state, int nargs, CValue *args)
+{
+    if (nargs != 2) {
+        cosmoV_error(state, "file:read() expected 2 arguments, got %d!", nargs);
+    }
+
+    if (!cosmoV_isValueUserType(state, args[0], COSMO_USER_FILE)) {
+        cosmoV_typeError(state, "file:read()", "<file>, <number> or \"a\"", "%s, %s",
+                         cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
+    }
+
+    CObjObject *fileObj = cosmoV_readObject(args[0]);
+    FILE *file = cosmoO_getUserP(fileObj);
+
+    if (IS_NUMBER(args[1])) {
+        CValue temp;
+        char *buffer;
+        cosmo_Number length = cosmoV_readNumber(args[1]);
+
+        // make sure the length is within the bounds of the file
+        if (length < 0) {
+            cosmoV_error(state, "file:read() expected length to be >= 0, got %d!", length);
+        }
+
+        // allocate a buffer for the read data
+        buffer = cosmoM_xmalloc(state, (size_t)length + 1);
+
+        // read the data
+        fread(buffer, sizeof(char), (size_t)length, file);
+        buffer[(int)length] = '\0'; // write the NULL terminator
+
+        // push the read data
+        temp = cosmoV_newRef(cosmoO_takeString(state, buffer, (size_t)length));
+        cosmoV_pushValue(state, temp);
+    } else if (IS_STRING(args[1])) {
+        if (strcmp(cosmoV_readCString(args[1]), "a") == 0) {
+            CValue temp;
+            char *buffer;
+            long length;
+
+            // get the length of the file
+            fseek(file, 0, SEEK_END);
+            length = ftell(file);
+            fseek(file, 0, SEEK_SET);
+
+            // allocate a buffer for the read data
+            buffer = cosmoM_xmalloc(state, (size_t)length + 1);
+
+            // read the data
+            fread(buffer, sizeof(char), (size_t)length, file);
+            buffer[length] = '\0'; // write the NULL terminator
+
+            // push the read data
+            temp = cosmoV_newRef(cosmoO_takeString(state, buffer, (size_t)length));
+            cosmoV_pushValue(state, temp);
+        } else {
+            cosmoV_error(state, "file:read() expected \"a\" or <number>, got \"%s\"!",
+                         cosmoV_readCString(args[1]));
+        }
+    } else {
+        cosmoV_typeError(state, "file:read()", "<file>, <number> or \"a\"", "%s, %s",
+                         cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
+    }
+
+    return 1;
+}
+
+int fileB_write(CState *state, int nargs, CValue *args)
+{
+    CObjObject *fileObj;
+    CObjString *str;
+    FILE *file;
+
+    if (nargs != 2) {
+        cosmoV_error(state, "file:write() expected 2 arguments, got %d!", nargs);
+    }
+
+    if (!cosmoV_isValueUserType(state, args[0], COSMO_USER_FILE)) {
+        cosmoV_typeError(state, "file:write()", "<file>, <string>", "%s, %s",
+                         cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
+    }
+
+    if (!IS_STRING(args[1])) {
+        cosmoV_typeError(state, "file:write()", "<file>, <string>", "%s, %s",
+                         cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
+    }
+
+    fileObj = cosmoV_readObject(args[0]);
+    str = cosmoV_readString(args[1]);
+
+    file = (FILE *)cosmoO_getUserP(fileObj);
+    fwrite(str->str, sizeof(char), str->length, file);
+
+    return 0;
+}
+
+int fileB_gc(CState *state, int nargs, CValue *args)
 {
     if (nargs != 1) {
-        cosmoV_error(state, "os.read() expected 1 argument, got %d!", nargs);
+        cosmoV_error(state, "file:read() expected 1 argument, got %d!", nargs);
     }
 
-    if (!IS_STRING(args[0])) {
+    if (!cosmoV_isValueUserType(state, args[0], COSMO_USER_FILE)) {
-        cosmoV_typeError(state, "os.read()", "<string>", "%s", cosmoV_typeStr(args[0]));
+        cosmoV_typeError(state, "file:__gc()", "<file>", "%s", cosmoV_typeStr(args[0]));
     }
 
-    CObjString *str = cosmoV_readString(args[0]);
+    CObjObject *fileObj = cosmoV_readObject(args[0]);
+    FILE *file = cosmoO_getUserP(fileObj);
 
-    // open file
+    fclose(file);
-    FILE *file = fopen(str->str, "rb");
+    return 0;
-    char *buf;
+}
-    size_t size, bRead;
 
+CObjObject *pushFileObj(CState *state, FILE *file)
+{
+    CObjObject *fileObj = cosmoO_newObject(state);
+    cosmoV_pushRef(state, (CObj *)fileObj);
+    cosmoO_setUserP(fileObj, file);
+    cosmoO_setUserT(fileObj, COSMO_USER_FILE);
+
+    // grab and set proto from the registry
+    cosmoV_pushRef(state, (CObj *)fileObj);
+    cosmoV_pushString(state, "file");
+    cosmoV_getRegistry(state);
+    cosmoV_setProto(state);
+
+    cosmoO_lock(fileObj);
+    return fileObj;
+}
+
+int cosmoB_osOpen(CState *state, int nargs, CValue *args)
+{
+    const char *filePath, *mode = "rb";
+    FILE *file;
+
+    if (nargs >= 1) {
+        if (!IS_STRING(args[0])) {
+            cosmoV_typeError(state, "os.open()", "<string>", "%s", cosmoV_typeStr(args[0]));
+        }
+
+        if (nargs == 2) {
+            if (!IS_STRING(args[1])) {
+                cosmoV_typeError(state, "os.open()", "<string>, <string>", "%s, %s",
+                                 cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
+            }
+
+            mode = cosmoV_readCString(args[1]);
+        } else if (nargs != 1) {
+            cosmoV_error(state, "os.open() expected 1 or 2 arguments, got %d!", nargs);
+        }
+    } else {
+        cosmoV_error(state, "os.open() expected 1 or 2 arguments, got %d!", nargs);
+    }
+
+    filePath = cosmoV_readCString(args[0]);
+    file = fopen(filePath, mode);
     if (file == NULL) {
-        // return nil, file doesn't exist
+        cosmoV_pushBoolean(state, true);
-        return 0;
+        cosmoV_pushFString(state, "Failed to open %s!", filePath);
+        return 2;
     }
 
-    // grab the size of the file
+    cosmoV_pushBoolean(state, false);
-    fseek(file, 0L, SEEK_END);
+    pushFileObj(state, file);
-    size = ftell(file);
+    return 2;
-    rewind(file);
-
-    buf = cosmoM_xmalloc(state, size + 1);        // +1 for the NULL terminator
-    bRead = fread(buf, sizeof(char), size, file); // read the file into the buffer
-
-    if (bRead < size) {
-        // an error occured! we don't need to really throw an error, returning a nil is good enough
-        return 0;
-    }
-
-    buf[bRead] = '\0'; // place the NULL terminator at the end of the buffer
-
-    // push the string to the stack to return
-    cosmoV_pushValue(state, cosmoV_newRef(cosmoO_takeString(state, buf, bRead)));
-    return 1;
 }
 
 // os.time()
@@ -309,9 +468,8 @@ int cosmoB_osSystem(CState *state, int nargs, CValue *args)
 
 COSMO_API void cosmoB_loadOS(CState *state)
 {
-    const char *identifiers[] = {"read", "time", "system"};
+    const char *identifiers[] = {"open", "time", "system"};
-
+    CosmoCFunction osLib[] = {cosmoB_osOpen, cosmoB_osTime, cosmoB_osSystem};
-    CosmoCFunction osLib[] = {cosmoB_osRead, cosmoB_osTime, cosmoB_osSystem};
 
     cosmoV_pushString(state, "os");
 
@@ -322,7 +480,30 @@ COSMO_API void cosmoB_loadOS(CState *state)
     }
 
     cosmoV_makeObject(state, i);
-    cosmoV_register(state, 1); // register the os.* object to the global table
+    cosmoV_addGlobals(state, 1); // register the os.* object to the global table
+
+    // make file proto
+    cosmoV_pushString(state, "file");
+
+    CObjObject *fileProto = cosmoO_newObject(state);
+    cosmoV_pushRef(state, (CObj *)fileProto);
+
+    cosmoV_pushRef(state, (CObj *)fileProto);
+    cosmoV_pushString(state, "read");
+    cosmoV_pushCFunction(state, fileB_read);
+    cosmoV_set(state);
+
+    cosmoV_pushRef(state, (CObj *)fileProto);
+    cosmoV_pushString(state, "write");
+    cosmoV_pushCFunction(state, fileB_write);
+    cosmoV_set(state);
+
+    cosmoV_pushRef(state, (CObj *)fileProto);
+    cosmoV_pushString(state, "__gc");
+    cosmoV_pushCFunction(state, fileB_gc);
+    cosmoV_set(state);
+
+    cosmoV_addRegistry(state, 1);
 }
 
 // ================================================================ [STRING.*]
@@ -546,8 +727,9 @@ int cosmoB_sRep(CState *state, int nargs, CValue *args)
     char *newStr = cosmoM_xmalloc(state, length + 1); // + 1 for the NULL terminator
 
     // copy the string over the new buffer
-    for (int i = 0; i < times; i++)
+    for (int i = 0; i < times; i++) {
         memcpy(&newStr[i * str->length], str->str, str->length);
+    }
 
     // write the NULL terminator
     newStr[length] = '\0';
@@ -578,7 +760,7 @@ void cosmoB_loadStrLib(CState *state)
     cosmoV_registerProtoObject(state, COBJ_STRING, obj);
 
     // register "string" to the global table
-    cosmoV_register(state, 1);
+    cosmoV_addGlobals(state, 1);
 }
 
 // ================================================================ [MATH]
@@ -773,7 +955,7 @@ void cosmoB_loadMathLib(CState *state)
 
     // make the object and register it as a global to the state
     cosmoV_makeObject(state, i);
-    cosmoV_register(state, 1);
+    cosmoV_addGlobals(state, 1);
 }
 
 // ================================================================ [VM.*]
@@ -924,5 +1106,5 @@ void cosmoB_loadVM(CState *state)
     cosmoV_makeObject(state, 5); // makes the vm object
 
     // register "vm" to the global table
-    cosmoV_register(state, 1);
+    cosmoV_addGlobals(state, 1);
 }

src/cbaselib.h

@@ -3,6 +3,13 @@
 
 #include "cstate.h"
 
+enum
+{
+    COSMO_USER_NONE, // CObjObject is not a userdata object
+    COSMO_USER_FILE, // CObjObject is a file object (see cosmoB_osOpen)
+    COSMO_USER_START // the first user type for user-defined userdata
+};
+
 /* loads all of the base library, including:
     - base library ("print", "assert", "type", "pcall", "loadstring", etc.)
     - object library

src/cdebug.c

@@ -5,8 +5,9 @@
 
 void printIndent(int indent)
 {
-    for (int i = 0; i < indent; i++)
+    for (int i = 0; i < indent; i++) {
         printf("\t");
+    }
 }
 
 static int simpleInstruction(const char *name, int offset)
@@ -61,7 +62,7 @@ static int constInstruction(const char *name, CChunk *chunk, int offset)
     printf("%-16s [%05d] - ", name, index);
     CValue val = chunk->constants.values[index];
 
-    printValue(val);
+    cosmoV_printValue(val);
 
     return offset + 1 + (sizeof(uint16_t) / sizeof(INSTRUCTION)); // consume opcode + uint
 }
@@ -127,7 +128,7 @@ int disasmInstr(CChunk *chunk, int offset, int indent)
         CObjFunction *cobjFunc = (CObjFunction *)cosmoV_readRef(val);
         offset += 3; // we consumed the opcode + u16
 
-        printValue(val);
+        cosmoV_printValue(val);
         printf("\n");
 
         // list the upvalues/locals that are captured
@@ -222,3 +223,8 @@ int disasmInstr(CChunk *chunk, int offset, int indent)
 
     return 1;
 }
+
+void cosmoG_disassemble(CObjClosure *closure)
+{
+    disasmChunk(&closure->function->chunk, closure->function->name == NULL ? UNNAMEDCHUNK : closure->function->name->str, 0);
+}

src/cdebug.h

@@ -2,10 +2,13 @@
 #define CDEBUG_H
 
 #include "cchunk.h"
+#include "cobj.h"
 
 COSMO_API void disasmChunk(CChunk *chunk, const char *name, int indent);
 COSMO_API int disasmInstr(CChunk *chunk, int offset, int indent);
 
 void printIndent(int indent);
 
+COSMO_API void cosmoG_disassemble(CObjClosure *closure);
+
 #endif

src/cmem.c

@@ -6,6 +6,7 @@
 #include "cstate.h"
 #include "ctable.h"
 #include "cvalue.h"
+#include "cvm.h"
 
 // realloc wrapper
 void *cosmoM_reallocate(CState *state, void *buf, size_t oldSize, size_t newSize)
@@ -164,8 +165,9 @@ static void blackenObject(CState *state, CObj *obj)
         markValue(state, err->err);
 
         // mark callframes
-        for (int i = 0; i < err->frameCount; i++)
+        for (int i = 0; i < err->frameCount; i++) {
             markObject(state, (CObj *)err->frames[i].closure);
+        }
 
         break;
     }
@@ -229,11 +231,11 @@ static void traceGrays(CState *state)
 
 static void sweep(CState *state)
 {
-    CObj *prev = NULL;
+    CObj *prev = NULL, *object = state->objects;
-    CObj *object = state->objects;
+
     while (object != NULL) {
         if (object->isMarked) {       // skip over it
-            object->isMarked = false; // rest to white
+            object->isMarked = false; // reset to white
             prev = object;
             object = object->next;
         } else { // free it!
@@ -246,22 +248,22 @@ static void sweep(CState *state)
                 prev->next = object;
             }
 
+            // call __gc on the object
+            CObjObject *protoObject = cosmoO_grabProto(oldObj);
+            CValue res;
+
+            // use user-defined __gc
+            if (protoObject != NULL && cosmoO_getIString(state, protoObject, ISTRING_GC, &res)) {
+                cosmoV_pushValue(state, res);
+                cosmoV_pushRef(state, (CObj *)oldObj);
+                cosmoV_call(state, 1, 0);
+            }
+
             cosmoO_free(state, oldObj);
         }
     }
 }
 
-static void markUserRoots(CState *state)
-{
-    CObj *root = state->userRoots;
-
-    // traverse userRoots and mark all the object
-    while (root != NULL) {
-        markObject(state, root);
-        root = root->nextRoot;
-    }
-}
-
 static void markRoots(CState *state)
 {
     // mark all values on the stack
@@ -282,14 +284,15 @@ static void markRoots(CState *state)
     markObject(state, (CObj *)state->globals);
 
     // mark all internal strings
-    for (int i = 0; i < ISTRING_MAX; i++)
+    for (int i = 0; i < ISTRING_MAX; i++) {
         markObject(state, (CObj *)state->iStrings[i]);
+    }
 
-    // mark the user defined roots
+    markTable(state, &state->registry);
-    markUserRoots(state);
 
-    for (int i = 0; i < COBJ_MAX; i++)
+    for (int i = 0; i < COBJ_MAX; i++) {
         markObject(state, (CObj *)state->protoObjects[i]);
+    }
 
     traceGrays(state);
 }
@@ -323,44 +326,3 @@ COSMO_API void cosmoM_updateThreshhold(CState *state)
 {
     state->nextGC = state->allocatedBytes * HEAP_GROW_FACTOR;
 }
-
-COSMO_API void cosmoM_addRoot(CState *state, CObj *newRoot)
-{
-    // first, check and make sure this root doesn't already exist in the list
-    CObj *root = state->userRoots;
-    while (root != NULL) {
-        if (root == newRoot) // found in the list, abort
-            return;
-
-        root = root->nextRoot;
-    }
-
-    // adds root to userRoot linked list
-    newRoot->nextRoot = state->userRoots;
-    state->userRoots = newRoot;
-}
-
-COSMO_API void cosmoM_removeRoot(CState *state, CObj *oldRoot)
-{
-    CObj *prev = NULL;
-    CObj *root = state->userRoots;
-
-    // traverse the userRoot linked list
-    while (root != NULL) {
-        if (root == oldRoot) { // found root in list
-
-            // remove from the linked list
-            if (prev == NULL) {
-                state->userRoots = root->nextRoot;
-            } else {
-                prev->nextRoot = root->nextRoot;
-            }
-
-            root->nextRoot = NULL;
-            break;
-        }
-
-        prev = root;
-        root = root->nextRoot;
-    }
-}

src/cmem.h

@@ -67,13 +67,6 @@ COSMO_API bool cosmoM_checkGarbage(CState *state,
 COSMO_API void cosmoM_collectGarbage(CState *state);
 COSMO_API void cosmoM_updateThreshhold(CState *state);
 
-// lets the VM know you are holding a reference to a CObj and to not free it
-// NOTE: prefer to use the stack when possible
-COSMO_API void cosmoM_addRoot(CState *state, CObj *newRoot);
-
-// lets the VM know this root is no longer held in a reference and is able to be freed
-COSMO_API void cosmoM_removeRoot(CState *state, CObj *oldRoot);
-
 // wrapper for cosmoM_reallocate so we can track our memory usage
 static inline void *cosmoM_xmalloc(CState *state, size_t sz)
 {

src/cobj.c

@@ -15,8 +15,9 @@ uint32_t hashString(const char *str, size_t sz)
     uint32_t hash = sz;
     size_t step = (sz >> 5) + 1;
 
-    for (size_t i = sz; i >= step; i -= step)
+    for (size_t i = sz; i >= step; i -= step) {
         hash = ((hash << 5) + (hash >> 2)) + str[i - 1];
+    }
 
     return hash;
 }
@@ -31,7 +32,6 @@ CObj *cosmoO_allocateBase(CState *state, size_t sz, CObjType type)
     obj->next = state->objects;
     state->objects = obj;
 
-    obj->nextRoot = NULL;
 #ifdef GC_DEBUG
     printf("allocated %s %p\n", cosmoO_typeStr(obj), obj);
 #endif
@@ -51,9 +51,9 @@ void cosmoO_free(CState *state, CObj *obj)
         break;
     }
     case COBJ_OBJECT: {
-        CObjObject *objTbl = (CObjObject *)obj;
+        CObjObject *objObj = (CObjObject *)obj;
-        cosmoT_clearTable(state, &objTbl->tbl);
+        cosmoT_clearTable(state, &objObj->tbl);
-        cosmoM_free(state, CObjObject, objTbl);
+        cosmoM_free(state, CObjObject, objObj);
         break;
     }
     case COBJ_TABLE: {
@@ -237,8 +237,9 @@ CObjError *cosmoO_newError(CState *state, CValue err)
     cerror->parserError = false;
 
     // clone the call frame
-    for (int i = 0; i < state->frameCount; i++)
+    for (int i = 0; i < state->frameCount; i++) {
         cerror->frames[i] = state->callFrame[i];
+    }
 
     return cerror;
 }
@@ -397,7 +398,7 @@ bool cosmoO_isDescendant(CObj *obj, CObjObject *proto)
 }
 
 // returns false if error thrown
-bool cosmoO_getRawObject(CState *state, CObjObject *proto, CValue key, CValue *val, CObj *obj)
+void cosmoO_getRawObject(CState *state, CObjObject *proto, CValue key, CValue *val, CObj *obj)
 {
     if (!cosmoT_get(state, &proto->tbl, key,
                     val)) { // if the field doesn't exist in the object, check the proto
@@ -407,18 +408,17 @@ bool cosmoO_getRawObject(CState *state, CObjObject *proto, CValue key, CValue *v
             cosmoV_pushRef(state, (CObj *)obj); // push object
             cosmoV_call(state, 1, 1);           // call the function with the 1 argument
             *val = *cosmoV_pop(state);          // set value to the return value of __index
-            return true;
+            return;
         }
 
-        if (proto->_obj.proto != NULL &&
+        // maybe the field is defined in the proto?
-            cosmoO_getRawObject(state, proto->_obj.proto, key, val, obj))
+        if (proto->_obj.proto != NULL) {
-            return true;
+            cosmoO_getRawObject(state, proto->_obj.proto, key, val, obj);
+            return;
+        }
 
         *val = cosmoV_newNil();
-        return true; // no protoobject to check against / key not found
     }
-
-    return true;
 }
 
 void cosmoO_setRawObject(CState *state, CObjObject *proto, CValue key, CValue val, CObj *obj)
@@ -519,7 +519,7 @@ bool cosmoO_getIString(CState *state, CObjObject *object, int flag, CValue *val)
     return false; // obj->proto was false, the istring doesn't exist in this object chain
 }
 
-bool cosmoO_indexObject(CState *state, CObjObject *object, CValue key, CValue *val)
+void cosmoO_indexObject(CState *state, CObjObject *object, CValue key, CValue *val)
 {
     if (cosmoO_getIString(state, object, ISTRING_INDEX, val)) {
         cosmoV_pushValue(state, *val);         // push function
@@ -527,15 +527,12 @@ bool cosmoO_indexObject(CState *state, CObjObject *object, CValue key, CValue *v
         cosmoV_pushValue(state, key);          // push key
         cosmoV_call(state, 2, 1);              // call the function with the 2 arguments
         *val = *cosmoV_pop(state);             // set value to the return value of __index
-        return true;
+    } else {                                   // there's no __index function defined!
-    } else { // there's no __index function defined!
         cosmoV_error(state, "Couldn't index object without __index function!");
     }
-
-    return false;
 }
 
-bool cosmoO_newIndexObject(CState *state, CObjObject *object, CValue key, CValue val)
+void cosmoO_newIndexObject(CState *state, CObjObject *object, CValue key, CValue val)
 {
     CValue ret; // return value for cosmoO_getIString
 
@@ -545,12 +542,9 @@ bool cosmoO_newIndexObject(CState *state, CObjObject *object, CValue key, CValue
         cosmoV_pushValue(state, key);          // push key & value pair
         cosmoV_pushValue(state, val);
         cosmoV_call(state, 3, 0);
-        return true;
     } else { // there's no __newindex function defined
         cosmoV_error(state, "Couldn't set index on object without __newindex function!");
     }
-
-    return false;
 }
 
 CObjString *cosmoO_toString(CState *state, CObj *obj)
@@ -721,13 +715,13 @@ void printObject(CObj *o)
     case COBJ_ERROR: {
         CObjError *err = (CObjError *)o;
         printf("%p -> ", (void *)o);
-        printValue(err->err);
+        cosmoV_printValue(err->err);
         break;
     }
     case COBJ_METHOD: {
         CObjMethod *method = (CObjMethod *)o;
         printf("%p -> ", (void *)method);
-        printValue(method->func);
+        cosmoV_printValue(method->func);
         break;
     }
     case COBJ_CLOSURE: {
@@ -739,7 +733,7 @@ void printObject(CObj *o)
     case COBJ_UPVALUE: {
         CObjUpval *upval = (CObjUpval *)o;
         printf("%p -> ", (void *)upval->val);
-        printValue(*upval->val);
+        cosmoV_printValue(*upval->val);
         break;
     }
     default:

src/cobj.h

@@ -3,6 +3,8 @@
 
 #include "cosmo.h"
 
+#include <stdarg.h>
+
 typedef enum CObjType
 {
     COBJ_STRING,
@@ -32,7 +34,6 @@ typedef int (*CosmoCFunction)(CState *state, int argCount, CValue *args);
 struct CObj
 {
     struct CObj *next;
-    struct CObj *nextRoot;    // for the root linked list
     struct CObjObject *proto; // protoobject, describes the behavior of the object
     CObjType type;
     bool isMarked; // for the GC
@@ -54,7 +55,7 @@ struct CObjError
     CCallFrame *frames;
     int frameCount;
     int line;         // reserved for parser errors
-    bool parserError; // if true, cosmoV_printError will format the error to the lexer
+    bool parserError; // if true, cosmoV_printBacktrace will format the error to the lexer
 };
 
 struct CObjObject
@@ -172,10 +173,10 @@ static inline CObjObject *cosmoO_grabProto(CObj *obj)
     return obj->type == COBJ_OBJECT ? (CObjObject *)obj : obj->proto;
 }
 
-bool cosmoO_getRawObject(CState *state, CObjObject *proto, CValue key, CValue *val, CObj *obj);
+void cosmoO_getRawObject(CState *state, CObjObject *proto, CValue key, CValue *val, CObj *obj);
 void cosmoO_setRawObject(CState *state, CObjObject *proto, CValue key, CValue val, CObj *obj);
-bool cosmoO_indexObject(CState *state, CObjObject *object, CValue key, CValue *val);
+void cosmoO_indexObject(CState *state, CObjObject *object, CValue key, CValue *val);
-bool cosmoO_newIndexObject(CState *state, CObjObject *object, CValue key, CValue val);
+void cosmoO_newIndexObject(CState *state, CObjObject *object, CValue key, CValue val);
 
 // sets the user-defined pointer, if a user-define integer is already defined it will be over
 // written

src/cparse.c

@@ -102,9 +102,7 @@ static int expressionPrecedence(CParseState *pstate, int needed, Precedence prec
 // returns # of pushed values onto the stack
 static int expression(CParseState *pstate, int needed, bool forceNeeded);
 static void statement(CParseState *pstate);
-static void declaration(CParseState *pstate);
 static void parseFunction(CParseState *pstate, FunctionType type);
-static void expressionStatement(CParseState *pstate);
 static ParseRule *getRule(CTokenType type);
 static CObjFunction *endCompiler(CParseState *pstate);
 
@@ -592,8 +590,6 @@ static void group(CParseState *pstate, bool canAssign, Precedence prec)
     consume(pstate, TOKEN_RIGHT_PAREN, "Expected ')'");
 }
 
-#define WRITE_GLOBAL_OP(pstate, op, arg)
-
 static void _etterAB(CParseState *pstate, uint8_t a, int b, bool isGlobal)
 {
     writeu8(pstate, a);
@@ -1101,18 +1097,19 @@ static ParseRule *getRule(CTokenType type)
 // returns true if it got past the first token (aka prefix wasn't null)
 static bool parsePrecedence(CParseState *pstate, Precedence prec)
 {
+    bool canAssign;
+    ParseFunc prefix, infix;
+
     advance(pstate);
-
+    if ((prefix = getRule(pstate->previous.type)->prefix) == NULL)
-    ParseFunc prefix = getRule(pstate->previous.type)->prefix;
-
-    if (prefix == NULL)
         return false;
 
-    bool canAssign = prec <= PREC_ASSIGNMENT;
+    canAssign = prec <= PREC_ASSIGNMENT;
     prefix(pstate, canAssign, prec);
-
     while (prec <= getRule(pstate->current.type)->level) {
-        ParseFunc infix = getRule(pstate->current.type)->infix;
+        if ((infix = getRule(pstate->current.type)->infix) == NULL)
+            break;
+
         advance(pstate);
         infix(pstate, canAssign, prec);
     }
@@ -1266,7 +1263,7 @@ static void endScope(CParseState *pstate)
 static void block(CParseState *pstate)
 {
     while (!check(pstate, TOKEN_END) && !check(pstate, TOKEN_EOF) && !check(pstate, TOKEN_ERROR)) {
-        declaration(pstate);
+        statement(pstate);
     }
 
     consume(pstate, TOKEN_END, "'end' expected to end block.'");
@@ -1323,7 +1320,7 @@ static void ifStatement(CParseState *pstate)
     while (!check(pstate, TOKEN_END) && !check(pstate, TOKEN_ELSE) &&
            !check(pstate, TOKEN_ELSEIF) && !check(pstate, TOKEN_EOF) &&
            !check(pstate, TOKEN_ERROR)) {
-        declaration(pstate);
+        statement(pstate);
     }
 
     endScope(pstate);
@@ -1473,10 +1470,10 @@ static void functionDeclaration(CParseState *pstate)
 
 static void returnStatement(CParseState *pstate)
 {
-    if (pstate->compiler->type != FTYPE_FUNCTION && pstate->compiler->type != FTYPE_METHOD) {
+    // if (pstate->compiler->type != FTYPE_FUNCTION && pstate->compiler->type != FTYPE_METHOD) {
-        error(pstate, "Expected 'return' in function!");
+    //     error(pstate, "Expected 'return' in function!");
-        return;
+    //     return;
-    }
+    // }
 
     if (blockFollow(pstate->current)) { // does this return have a value
         writeu8(pstate, OP_NIL);
@@ -1591,7 +1588,7 @@ static void forLoop(CParseState *pstate)
 
     // parse initializer
     if (!match(pstate, TOKEN_EOS)) {
-        expressionStatement(pstate);
+        statement(pstate);
         consume(pstate, TOKEN_EOS, "Expected ';' after initializer");
     }
 
@@ -1707,7 +1704,7 @@ static int expression(CParseState *pstate, int needed, bool forceNeeded)
                                 forceNeeded); // anything above assignments are an expression
 }
 
-static void expressionStatement(CParseState *pstate)
+static void statement(CParseState *pstate)
 {
     int savedPushed = pstate->compiler->pushedValues;
 
@@ -1762,16 +1759,6 @@ static void expressionStatement(CParseState *pstate)
     alignStack(pstate, savedPushed);
 }
 
-static void statement(CParseState *pstate)
-{
-    expressionStatement(pstate);
-}
-
-static void declaration(CParseState *pstate)
-{
-    statement(pstate);
-}
-
 static CObjFunction *endCompiler(CParseState *pstate)
 {
     popLocals(pstate, pstate->compiler->scopeDepth + 1); // remove the locals from other scopes
@@ -1796,7 +1783,7 @@ CObjFunction *cosmoP_compileString(CState *state, const char *source, const char
     advance(&parser);
 
     while (!match(&parser, TOKEN_EOF)) {
-        declaration(&parser);
+        statement(&parser);
     }
 
     consume(&parser, TOKEN_EOF, "End of file expected!");

src/cstate.c

@@ -12,6 +12,7 @@ CPanic *cosmoV_newPanic(CState *state)
     CPanic *panic = cosmoM_xmalloc(state, sizeof(CPanic));
     panic->top = state->top;
     panic->frameCount = state->frameCount;
+    panic->freezeGC = state->freezeGC;
     panic->prev = state->panic;
     state->panic = panic;
 
@@ -41,7 +42,6 @@ CState *cosmoV_newState()
 
     // GC
     state->objects = NULL;
-    state->userRoots = NULL;
     state->grayStack.count = 0;
     state->grayStack.capacity = 2;
     state->grayStack.array = NULL;
@@ -54,18 +54,22 @@ CState *cosmoV_newState()
     state->openUpvalues = NULL;
 
     // set default proto objects
-    for (int i = 0; i < COBJ_MAX; i++)
+    for (int i = 0; i < COBJ_MAX; i++) {
         state->protoObjects[i] = NULL;
+    }
 
-    for (int i = 0; i < ISTRING_MAX; i++)
+    for (int i = 0; i < ISTRING_MAX; i++) {
         state->iStrings[i] = NULL;
+    }
 
     cosmoT_initTable(state, &state->strings, 16); // init string table
+    cosmoT_initTable(state, &state->registry, 16);
 
     state->globals = cosmoO_newTable(state); // init global table
 
     // setup all strings used by the VM
     state->iStrings[ISTRING_INIT] = cosmoO_copyString(state, "__init", 6);
+    state->iStrings[ISTRING_GC] = cosmoO_copyString(state, "__gc", 4);
     state->iStrings[ISTRING_TOSTRING] = cosmoO_copyString(state, "__tostring", 10);
     state->iStrings[ISTRING_TONUMBER] = cosmoO_copyString(state, "__tonumber", 10);
     state->iStrings[ISTRING_INDEX] = cosmoO_copyString(state, "__index", 7);
@@ -85,8 +89,9 @@ CState *cosmoV_newState()
     state->iStrings[ISTRING_RESERVED] = cosmoO_copyString(state, "__reserved", 10);
 
     // set the IString flags
-    for (int i = 0; i < ISTRING_MAX; i++)
+    for (int i = 0; i < ISTRING_MAX; i++) {
         state->iStrings[i]->isIString = true;
+    }
 
     state->freezeGC = 0; // unfreeze the state
     return state;
@@ -113,12 +118,15 @@ void cosmoV_freeState(CState *state)
     }
 
     // mark our internal VM strings NULL
-    for (int i = 0; i < ISTRING_MAX; i++)
+    for (int i = 0; i < ISTRING_MAX; i++) {
         state->iStrings[i] = NULL;
+    }
 
     // free our string table (the string table includes the internal VM strings)
     cosmoT_clearTable(state, &state->strings);
 
+    cosmoT_clearTable(state, &state->registry);
+
     // free our gray stack & finally free the state structure
     cosmoM_freeArray(state, CObj *, state->grayStack.array, state->grayStack.capacity);
 
@@ -132,7 +140,7 @@ void cosmoV_freeState(CState *state)
 }
 
 // expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
-void cosmoV_register(CState *state, int pairs)
+void cosmoV_addGlobals(CState *state, int pairs)
 {
     for (int i = 0; i < pairs; i++) {
         StkPtr key = cosmoV_getTop(state, 1);
@@ -145,12 +153,57 @@ void cosmoV_register(CState *state, int pairs)
     }
 }
 
+// expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
+void cosmoV_addRegistry(CState *state, int pairs)
+{
+    for (int i = 0; i < pairs; i++) {
+        StkPtr key = cosmoV_getTop(state, 1);
+        StkPtr val = cosmoV_getTop(state, 0);
+
+        CValue *oldVal = cosmoT_insert(state, &state->registry, *key);
+        *oldVal = *val;
+
+        cosmoV_setTop(state, 2); // pops the 2 values off the stack
+    }
+}
+
+// expects 1 key on the stack, pushes result
+void cosmoV_getRegistry(CState *state)
+{
+    CValue key = *cosmoV_pop(state);
+    CValue val;
+
+    if (!cosmoT_get(state, &state->registry, key, &val)) {
+        cosmoV_error(state, "failed to grab %s from registry", cosmoV_typeStr(key));
+    }
+
+    cosmoV_pushValue(state, val);
+}
+
+void cosmoV_setProto(CState *state)
+{
+    StkPtr objVal = cosmoV_getTop(state, 1);
+    StkPtr protoVal = cosmoV_getTop(state, 0);
+
+    if (!IS_REF(*objVal) || !IS_OBJECT(*protoVal)) {
+        cosmoV_error(state, "cannot set %s to proto of type %s", cosmoV_typeStr(*objVal),
+                     cosmoV_typeStr(*protoVal));
+    }
+
+    // actually set the protos
+    CObj *obj = cosmoV_readRef(*objVal);
+    CObjObject *proto = cosmoV_readObject(*protoVal);
+    obj->proto = proto;
+
+    cosmoV_setTop(state, 2);
+}
+
 void cosmoV_printStack(CState *state)
 {
     printf("==== [[ stack dump ]] ====\n");
     for (CValue *top = state->top - 1; top >= state->stack; top--) {
         printf("%d: ", (int)(top - state->stack));
-        printValue(*top);
+        cosmoV_printValue(*top);
         printf("\n");
     }
 }

src/cstate.h

@@ -18,6 +18,7 @@ struct CCallFrame
 typedef enum IStringEnum
 {
     ISTRING_INIT,     // __init
+    ISTRING_GC,       // __gc
     ISTRING_TOSTRING, // __tostring
     ISTRING_TONUMBER, // __tonumber
     ISTRING_EQUAL,    // __equals
@@ -46,6 +47,7 @@ typedef struct CPanic
     StkPtr top;
     struct CPanic *prev;
     int frameCount;
+    int freezeGC;
 } CPanic;
 
 struct CState
@@ -55,21 +57,20 @@ struct CState
     CObjObject *protoObjects[COBJ_MAX]; // proto object for each COBJ type [NULL = no default proto]
     CObjString *iStrings[ISTRING_MAX];  // strings used internally by the VM, eg. __init, __index
     CTable strings;
+    CTable registry;
     ArrayCObj grayStack; // keeps track of which objects *haven't yet* been traversed in our GC, but
                          // *have been* found
 
     CObjUpval *openUpvalues; // tracks all of our still open (meaning still on the stack) upvalues
     CObjTable *globals;
-    CValue *top;     // top of the stack
+    CValue *top;   // top of the stack
-    CObj *objects;   // tracks all of our allocated objects
+    CObj *objects; // tracks all of our allocated objects
-    CObj *userRoots; // user definable roots, this holds CObjs that should be considered "roots",
-                     // lets the VM know you are holding a reference to a CObj in your code
     CPanic *panic;
 
-    int freezeGC; // when > 0, GC events will be ignored (for internal use)
-    int frameCount;
     size_t allocatedBytes;
     size_t nextGC; // when allocatedBytes reaches this threshhold, trigger a GC event
+    int freezeGC;  // when > 0, GC events will be ignored (for internal use)
+    int frameCount;
 };
 
 CPanic *cosmoV_newPanic(CState *state);
@@ -79,7 +80,16 @@ COSMO_API CState *cosmoV_newState();
 COSMO_API void cosmoV_freeState(CState *state);
 
 // expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
-COSMO_API void cosmoV_register(CState *state, int pairs);
+COSMO_API void cosmoV_addGlobals(CState *state, int pairs);
+
+// expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
+COSMO_API void cosmoV_addRegistry(CState *state, int pairs);
+
+// expects 1 key on the stack, pushes result
+COSMO_API void cosmoV_getRegistry(CState *state);
+
+// expects <object>->proto = <object> (2 total) to be on the stack
+COSMO_API void cosmoV_setProto(CState *state);
 
 COSMO_API void cosmoV_printStack(CState *state);
 

src/ctable.c

@@ -69,6 +69,8 @@ static uint32_t getObjectHash(CObj *obj)
     switch (obj->type) {
     case COBJ_STRING:
         return ((CObjString *)obj)->hash;
+    case COBJ_CFUNCTION:
+        return (uint32_t)((CObjCFunction *)obj)->cfunc;
     default:
         return (uint32_t)obj; // just "hash" the pointer
     }
@@ -87,8 +89,9 @@ static uint32_t getValueHash(CValue *val)
             return 0;
 
         memcpy(buf, &num, sizeof(buf));
-        for (size_t i = 0; i < sizeof(cosmo_Number) / sizeof(uint32_t); i++)
+        for (size_t i = 0; i < sizeof(cosmo_Number) / sizeof(uint32_t); i++) {
             buf[0] += buf[i];
+        }
         return buf[0];
     }
     // TODO: add support for other types
@@ -285,9 +288,9 @@ void cosmoT_printTable(CTable *tbl, const char *name)
     for (int i = 0; i < cap; i++) {
         CTableEntry *entry = &tbl->table[i];
         if (!(IS_NIL(entry->key))) {
-            printValue(entry->key);
+            cosmoV_printValue(entry->key);
             printf(" - ");
-            printValue(entry->val);
+            cosmoV_printValue(entry->val);
             printf("\n");
         }
     }

src/cvalue.c

@@ -101,7 +101,7 @@ const char *cosmoV_typeStr(CValue val)
     }
 }
 
-void printValue(CValue val)
+void cosmoV_printValue(CValue val)
 {
     switch (GET_TYPE(val)) {
     case COSMO_TNUMBER:

src/cvalue.h

@@ -119,7 +119,7 @@ void initValArray(CState *state, CValueArray *val, size_t startCapacity);
 void cleanValArray(CState *state, CValueArray *array); // cleans array
 void appendValArray(CState *state, CValueArray *array, CValue val);
 
-void printValue(CValue val);
+void cosmoV_printValue(CValue val);
 COSMO_API bool cosmoV_equal(CState *state, CValue valA, CValue valB);
 COSMO_API CObjString *cosmoV_toString(CState *state, CValue val);
 COSMO_API cosmo_Number cosmoV_toNumber(CState *state, CValue val);

src/cvm.c

@@ -12,7 +12,7 @@
 
 #define cosmoV_protect(panic) setjmp(panic->jmp) == 0
 
-COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...)
+void cosmoV_pushFString(CState *state, const char *format, ...)
 {
     va_list args;
     va_start(args, format);
@@ -21,19 +21,20 @@ COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...)
 }
 
 // inserts val at state->top - indx - 1, moving everything else up
-COSMO_API void cosmo_insert(CState *state, int indx, CValue val)
+void cosmoV_insert(CState *state, int indx, CValue val)
 {
     StkPtr tmp = cosmoV_getTop(state, indx);
 
     // moves everything up
-    for (StkPtr i = state->top; i > tmp; i--)
+    for (StkPtr i = state->top; i > tmp; i--) {
         *i = *(i - 1);
+    }
 
     *tmp = val;
     state->top++;
 }
 
-COSMO_API bool cosmoV_undump(CState *state, cosmo_Reader reader, const void *ud)
+bool cosmoV_undump(CState *state, cosmo_Reader reader, const void *ud)
 {
     CObjFunction *func;
 
@@ -54,7 +55,7 @@ COSMO_API bool cosmoV_undump(CState *state, cosmo_Reader reader, const void *ud)
 
 // returns false if failed, error will be on the top of the stack. true if successful, closure will
 // be on the top of the stack
-COSMO_API bool cosmoV_compileString(CState *state, const char *src, const char *name)
+bool cosmoV_compileString(CState *state, const char *src, const char *name)
 {
     CObjFunction *func;
     CPanic *panic = cosmoV_newPanic(state);
@@ -77,7 +78,7 @@ COSMO_API bool cosmoV_compileString(CState *state, const char *src, const char *
     return false;
 }
 
-COSMO_API void cosmoV_printError(CState *state, CObjError *err)
+void cosmoV_printBacktrace(CState *state, CObjError *err)
 {
     // print stack trace
     for (int i = 0; i < err->frameCount; i++) {
@@ -122,12 +123,13 @@ void cosmoV_throw(CState *state)
     if (state->panic) {
         state->top = state->panic->top;
         state->frameCount = state->panic->frameCount;
+        state->freezeGC = state->panic->freezeGC;
         cosmoV_pushValue(state, val);
         longjmp(state->panic->jmp, 1);
     } else {
         cosmoV_pushValue(state, val);
         fprintf(stderr, "Unhandled panic! ");
-        cosmoV_printError(state, error);
+        cosmoV_printBacktrace(state, error);
         exit(1);
     }
 }
@@ -267,8 +269,9 @@ static void callCFunction(CState *state, CosmoCFunction cfunc, int args, int nre
     state->top += nres;             // and make sure to move state->top to match
 
     // now, if the caller function expected more return values, push nils onto the stack
-    for (int i = nres; i < nresults; i++)
+    for (int i = nres; i < nresults; i++) {
         cosmoV_pushValue(state, cosmoV_newNil());
+    }
 }
 
 /*
@@ -326,8 +329,9 @@ static void rawCall(CState *state, CObjClosure *closure, int args, int nresults,
     state->top += nres; // and make sure to move state->top to match
 
     // now, if the caller function expected more return values, push nils onto the stack
-    for (int i = nres; i < nresults; i++)
+    for (int i = nres; i < nresults; i++) {
         cosmoV_pushValue(state, cosmoV_newNil());
+    }
 }
 
 // returns true if successful, false if error
@@ -336,7 +340,7 @@ void callCValue(CState *state, CValue func, int args, int nresults, int offset)
 #ifdef VM_DEBUG
     printf("\n");
     printIndent(state->frameCount - 1);
-    printValue(func);
+    cosmoV_printValue(func);
     printf("(%d args)\n", args);
 #endif
 
@@ -376,9 +380,9 @@ void callCValue(CState *state, CValue func, int args, int nresults, int offset)
         if (nresults > 0) {
             cosmoV_pushRef(state, (CObj *)newObj);
 
-            // push the nils to fill up the expected return values
+            // push the nils to fill up the expected return values.
-            for (int i = 0; i < nresults - 1;
+            // -1 since the we already pushed the important value
-                 i++) { // -1 since the we already pushed the important value
+            for (int i = 0; i < nresults - 1; i++) {
                 cosmoV_pushValue(state, cosmoV_newNil());
             }
         }
@@ -414,8 +418,9 @@ bool cosmoV_pcall(CState *state, int args, int nresults)
 
         if (nresults > 0) {
             // push other expected results onto the stack
-            for (int i = 0; i < nresults - 1; i++)
+            for (int i = 0; i < nresults - 1; i++) {
                 cosmoV_pushValue(state, cosmoV_newNil());
+            }
         }
 
         cosmoV_freePanic(state);
@@ -438,7 +443,7 @@ static inline bool isFalsey(StkPtr val)
     return IS_NIL(*val) || (IS_BOOLEAN(*val) && !cosmoV_readBoolean(*val));
 }
 
-COSMO_API CObjObject *cosmoV_makeObject(CState *state, int pairs)
+CObjObject *cosmoV_makeObject(CState *state, int pairs)
 {
     StkPtr key, val;
     CObjObject *newObj = cosmoO_newObject(state);
@@ -459,7 +464,7 @@ COSMO_API CObjObject *cosmoV_makeObject(CState *state, int pairs)
     return newObj;
 }
 
-COSMO_API bool cosmoV_registerProtoObject(CState *state, CObjType objType, CObjObject *obj)
+bool cosmoV_registerProtoObject(CState *state, CObjType objType, CObjObject *obj)
 {
     bool replaced = state->protoObjects[objType] != NULL;
     state->protoObjects[objType] = obj;
@@ -468,7 +473,7 @@ COSMO_API bool cosmoV_registerProtoObject(CState *state, CObjType objType, CObjO
     CObj *curr = state->objects;
     while (curr != NULL) {
         // update the proto
-        if (curr->type == objType && curr->proto != NULL) {
+        if (curr != (CObj *)obj && curr->type == objType && curr->proto != NULL) {
             curr->proto = obj;
         }
         curr = curr->next;
@@ -477,7 +482,7 @@ COSMO_API bool cosmoV_registerProtoObject(CState *state, CObjType objType, CObjO
     return replaced;
 }
 
-COSMO_API void cosmoV_makeTable(CState *state, int pairs)
+void cosmoV_makeTable(CState *state, int pairs)
 {
     StkPtr key, val;
     CObjTable *newObj = cosmoO_newTable(state);
@@ -497,7 +502,7 @@ COSMO_API void cosmoV_makeTable(CState *state, int pairs)
     cosmoV_pushRef(state, (CObj *)newObj);
 }
 
-bool cosmoV_rawget(CState *state, CObj *_obj, CValue key, CValue *val)
+void cosmoV_rawget(CState *state, CObj *_obj, CValue key, CValue *val)
 {
     CObjObject *object = cosmoO_grabProto(_obj);
 
@@ -506,23 +511,16 @@ bool cosmoV_rawget(CState *state, CObj *_obj, CValue key, CValue *val)
         CObjString *field = cosmoV_toString(state, key);
         cosmoV_error(state, "No proto defined! Couldn't get field '%s' from type %s", field->str,
                      cosmoO_typeStr(_obj));
-        *val = cosmoV_newNil();
-        return false;
     }
 
     // push the object onto the stack so the GC can find it
     cosmoV_pushRef(state, (CObj *)object);
-    if (cosmoO_getRawObject(state, object, key, val, _obj)) {
+    cosmoO_getRawObject(state, object, key, val, _obj);
-        // *val now equals the response, pop the object
-        cosmoV_pop(state);
-        return true;
-    }
 
     cosmoV_pop(state);
-    return false;
 }
 
-bool cosmoV_rawset(CState *state, CObj *_obj, CValue key, CValue val)
+void cosmoV_rawset(CState *state, CObj *_obj, CValue key, CValue val)
 {
     CObjObject *object = cosmoO_grabProto(_obj);
 
@@ -531,14 +529,12 @@ bool cosmoV_rawset(CState *state, CObj *_obj, CValue key, CValue val)
         CObjString *field = cosmoV_toString(state, key);
         cosmoV_error(state, "No proto defined! Couldn't set field '%s' to type %s", field->str,
                      cosmoO_typeStr(_obj));
-        return false;
     }
 
     cosmoO_setRawObject(state, object, key, val, _obj);
-    return true;
 }
 
-COSMO_API bool cosmoV_get(CState *state)
+void cosmoV_get(CState *state)
 {
     CValue val;
     StkPtr obj = cosmoV_getTop(state, 1); // object was pushed first
@@ -546,20 +542,17 @@ COSMO_API bool cosmoV_get(CState *state)
 
     if (!IS_REF(*obj)) {
         cosmoV_error(state, "Couldn't get field from type %s!", cosmoV_typeStr(*obj));
-        return false;
     }
 
-    if (!cosmoV_rawget(state, cosmoV_readRef(*obj), *key, &val))
+    cosmoV_rawget(state, cosmoV_readRef(*obj), *key, &val);
-        return false;
 
     // pop the obj & key, push the value
     cosmoV_setTop(state, 2);
     cosmoV_pushValue(state, val);
-    return true;
 }
 
 // yes, this would technically make it possible to set fields of types other than <string>. go crazy
-COSMO_API bool cosmoV_set(CState *state)
+void cosmoV_set(CState *state)
 {
     StkPtr obj = cosmoV_getTop(state, 2); // object was pushed first
     StkPtr key = cosmoV_getTop(state, 1); // then the key
@@ -567,21 +560,17 @@ COSMO_API bool cosmoV_set(CState *state)
 
     if (!IS_REF(*obj)) {
         cosmoV_error(state, "Couldn't set field on type %s!", cosmoV_typeStr(*obj));
-        return false;
     }
 
-    if (!cosmoV_rawset(state, cosmoV_readRef(*obj), *key, *val))
+    cosmoV_rawset(state, cosmoV_readRef(*obj), *key, *val);
-        return false;
 
     // pop the obj, key & value
     cosmoV_setTop(state, 3);
-    return true;
 }
 
-COSMO_API bool cosmoV_getMethod(CState *state, CObj *obj, CValue key, CValue *val)
+void cosmoV_getMethod(CState *state, CObj *obj, CValue key, CValue *val)
 {
-    if (!cosmoV_rawget(state, obj, key, val))
+    cosmoV_rawget(state, obj, key, val);
-        return false;
 
     // if the result is callable, wrap it in an method
     if (IS_CALLABLE(*val)) {
@@ -591,6 +580,18 @@ COSMO_API bool cosmoV_getMethod(CState *state, CObj *obj, CValue key, CValue *va
         cosmoV_pop(state); // pop the object
         *val = cosmoV_newRef(method);
     }
+}
+
+bool cosmoV_isValueUserType(CState *state, CValue val, int userType)
+{
+    if (!IS_OBJECT(val)) {
+        return false;
+    }
+
+    CObjObject *obj = cosmoV_readObject(val);
+    if (obj->userT != userType) {
+        return false;
+    }
 
     return true;
 }
@@ -696,7 +697,7 @@ static inline uint16_t READUINT(CCallFrame *frame)
 #    define SWITCH switch (READBYTE(frame))
 #    define DEFAULT                                                                                \
     default:                                                                                       \
-        printf("[ERROR] unknown opcode!");                                                                 \
+        printf("[ERROR] unknown opcode!");                                                         \
         exit(0)
 #endif
 
@@ -849,18 +850,15 @@ int cosmoV_execute(CState *state)
                 // sanity check
                 if (!IS_REF(*temp)) {
                     cosmoV_error(state, "Couldn't index type %s!", cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 CObj *obj = cosmoV_readRef(*temp);
                 CObjObject *proto = cosmoO_grabProto(obj);
-                CValue val; // to hold our value
+                CValue val = cosmoV_newNil(); // to hold our value
 
                 if (proto != NULL) {
                     // check for __index metamethod
-                    if (!cosmoO_indexObject(state, proto, *key,
+                    cosmoO_indexObject(state, proto, *key, &val);
-                                            &val)) // if returns false, cosmoV_error was called
-                        return -1;
                 } else if (obj->type == COBJ_TABLE) {
                     CObjTable *tbl = (CObjTable *)obj;
 
@@ -868,7 +866,6 @@ int cosmoV_execute(CState *state)
                 } else {
                     cosmoV_error(state, "No proto defined! Couldn't __index from type %s",
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 cosmoV_setTop(state, 2);      // pops the table & the key
@@ -883,17 +880,13 @@ int cosmoV_execute(CState *state)
                 // sanity check
                 if (!IS_REF(*temp)) {
                     cosmoV_error(state, "Couldn't set index with type %s!", cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 CObj *obj = cosmoV_readRef(*temp);
                 CObjObject *proto = cosmoO_grabProto(obj);
 
                 if (proto != NULL) {
-                    if (!cosmoO_newIndexObject(
+                    cosmoO_newIndexObject(state, proto, *key, *value);
-                            state, proto, *key,
-                            *value)) // if it returns false, cosmoV_error was called
-                        return -1;
                 } else if (obj->type == COBJ_TABLE) {
                     CObjTable *tbl = (CObjTable *)obj;
                     CValue *newVal = cosmoT_insert(state, &tbl->tbl, *key);
@@ -902,7 +895,6 @@ int cosmoV_execute(CState *state)
                 } else {
                     cosmoV_error(state, "No proto defined! Couldn't __newindex from type %s",
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 // pop everything off the stack
@@ -921,13 +913,11 @@ int cosmoV_execute(CState *state)
 
                 // sanity check
                 if (IS_REF(*temp)) {
-                    if (!cosmoV_rawset(state, cosmoV_readRef(*temp), constants[ident], *value))
+                    cosmoV_rawset(state, cosmoV_readRef(*temp), constants[ident], *value);
-                        return -1;
                 } else {
                     CObjString *field = cosmoV_toString(state, constants[ident]);
                     cosmoV_error(state, "Couldn't set field '%s' on type %s!", field->str,
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 // pop everything off the stack
@@ -935,19 +925,17 @@ int cosmoV_execute(CState *state)
             }
             CASE(OP_GETOBJECT) :
             {
-                CValue val;                            // to hold our value
+                CValue val = cosmoV_newNil();          // to hold our value
                 StkPtr temp = cosmoV_getTop(state, 0); // that should be the object
                 uint16_t ident = READUINT(frame);      // use for the key
 
                 // sanity check
                 if (IS_REF(*temp)) {
-                    if (!cosmoV_rawget(state, cosmoV_readRef(*temp), constants[ident], &val))
+                    cosmoV_rawget(state, cosmoV_readRef(*temp), constants[ident], &val);
-                        return -1;
                 } else {
                     CObjString *field = cosmoV_toString(state, constants[ident]);
                     cosmoV_error(state, "Couldn't get field '%s' from type %s!", field->str,
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 cosmoV_setTop(state, 1);      // pops the object
@@ -955,20 +943,18 @@ int cosmoV_execute(CState *state)
             }
             CASE(OP_GETMETHOD) :
             {
-                CValue val;                            // to hold our value
+                CValue val = cosmoV_newNil();          // to hold our value
                 StkPtr temp = cosmoV_getTop(state, 0); // that should be the object
                 uint16_t ident = READUINT(frame);      // use for the key
 
                 // this is almost identical to GETOBJECT, however cosmoV_getMethod is used instead
                 // of just cosmoV_get
                 if (IS_REF(*temp)) {
-                    if (!cosmoV_getMethod(state, cosmoV_readRef(*temp), constants[ident], &val))
+                    cosmoV_getMethod(state, cosmoV_readRef(*temp), constants[ident], &val);
-                        return -1;
                 } else {
                     CObjString *field = cosmoV_toString(state, constants[ident]);
                     cosmoV_error(state, "Couldn't get field '%s' from type %s!", field->str,
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 cosmoV_setTop(state, 1);      // pops the object
@@ -985,14 +971,12 @@ int cosmoV_execute(CState *state)
                 // sanity check
                 if (IS_REF(*temp)) {
                     // get the field from the object
-                    if (!cosmoV_rawget(state, cosmoV_readRef(*temp), constants[ident], &val))
+                    cosmoV_rawget(state, cosmoV_readRef(*temp), constants[ident], &val);
-                        return -1;
 
                     // now invoke the method!
                     invokeMethod(state, cosmoV_readRef(*temp), val, args, nres, 1);
                 } else {
                     cosmoV_error(state, "Couldn't get from type %s!", cosmoV_typeStr(*temp));
-                    return -1;
                 }
             }
             CASE(OP_ITER) :
@@ -1002,7 +986,6 @@ int cosmoV_execute(CState *state)
                 if (!IS_REF(*temp)) {
                     cosmoV_error(state, "Couldn't iterate over non-iterator type %s!",
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 CObj *obj = cosmoV_readRef(*temp);
@@ -1026,7 +1009,6 @@ int cosmoV_execute(CState *state)
                                          "Expected iterable object! '__iter' returned %s, expected "
                                          "<object>!",
                                          cosmoV_typeStr(*iObj));
-                            return -1;
                         }
 
                         // get __next method and place it at the top of the stack
@@ -1034,7 +1016,6 @@ int cosmoV_execute(CState *state)
                                          cosmoV_newRef(state->iStrings[ISTRING_NEXT]), iObj);
                     } else {
                         cosmoV_error(state, "Expected iterable object! '__iter' not defined!");
-                        return -1;
                     }
                 } else if (obj->type == COBJ_TABLE) {
                     CObjTable *tbl = (CObjTable *)obj;
@@ -1059,7 +1040,6 @@ int cosmoV_execute(CState *state)
                 } else {
                     cosmoV_error(state, "No proto defined! Couldn't get from type %s",
                                  cosmoO_typeStr(obj));
-                    return -1;
                 }
             }
             CASE(OP_NEXT) :
@@ -1071,7 +1051,6 @@ int cosmoV_execute(CState *state)
                 if (!IS_METHOD(*temp)) {
                     cosmoV_error(state, "Expected '__next' to be a method, got type %s!",
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 cosmoV_pushValue(state, *temp);
@@ -1114,7 +1093,6 @@ int cosmoV_execute(CState *state)
                 } else {
                     cosmoV_error(state, "Expected numbers, got %s and %s!", cosmoV_typeStr(*valA),
                                  cosmoV_typeStr(*valB));
-                    return -1;
                 }
             }
             CASE(OP_POW) :
@@ -1128,7 +1106,6 @@ int cosmoV_execute(CState *state)
                 } else {
                     cosmoV_error(state, "Expected numbers, got %s and %s!", cosmoV_typeStr(*valA),
                                  cosmoV_typeStr(*valB));
-                    return -1;
                 }
             }
             CASE(OP_NOT) :
@@ -1144,7 +1121,6 @@ int cosmoV_execute(CState *state)
                     cosmoV_pushNumber(state, -(cosmoV_readNumber(*val)));
                 } else {
                     cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(*val));
-                    return -1;
                 }
             }
             CASE(OP_COUNT) :
@@ -1153,7 +1129,6 @@ int cosmoV_execute(CState *state)
 
                 if (!IS_REF(*temp)) {
                     cosmoV_error(state, "Expected non-primitive, got %s!", cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 int count = cosmoO_count(state, cosmoV_readRef(*temp));
@@ -1178,7 +1153,6 @@ int cosmoV_execute(CState *state)
                     *val = cosmoV_newNumber(cosmoV_readNumber(*val) + inc);
                 } else {
                     cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(*val));
-                    return -1;
                 }
             }
             CASE(OP_INCGLOBAL) :
@@ -1194,7 +1168,6 @@ int cosmoV_execute(CState *state)
                     *val = cosmoV_newNumber(cosmoV_readNumber(*val) + inc);
                 } else {
                     cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(*val));
-                    return -1;
                 }
             }
             CASE(OP_INCUPVAL) :
@@ -1209,7 +1182,6 @@ int cosmoV_execute(CState *state)
                     *val = cosmoV_newNumber(cosmoV_readNumber(*val) + inc);
                 } else {
                     cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(*val));
-                    return -1;
                 }
             }
             CASE(OP_INCINDEX) :
@@ -1221,7 +1193,6 @@ int cosmoV_execute(CState *state)
                 if (!IS_REF(*temp)) {
                     cosmoV_error(state, "Couldn't index non-indexable type %s!",
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
 
                 CObj *obj = cosmoV_readRef(*temp);
@@ -1230,27 +1201,23 @@ int cosmoV_execute(CState *state)
 
                 // call __index if the proto was found
                 if (proto != NULL) {
-                    if (cosmoO_indexObject(state, proto, *key, &val)) {
+                    cosmoO_indexObject(state, proto, *key, &val);
-                        if (!IS_NUMBER(val)) {
-                            cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(val));
-                            return -1;
-                        }
 
-                        cosmoV_pushValue(state, val); // pushes old value onto the stack :)
+                    if (!IS_NUMBER(val)) {
+                        cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(val));
+                    }
 
-                        // call __newindex
+                    cosmoV_pushValue(state, val); // pushes old value onto the stack :)
-                        if (!cosmoO_newIndexObject(state, proto, *key,
+
-                                                   cosmoV_newNumber(cosmoV_readNumber(val) + inc)))
+                    // call __newindex
-                            return -1;
+                    cosmoO_newIndexObject(state, proto, *key,
-                    } else
+                                          cosmoV_newNumber(cosmoV_readNumber(val) + inc));
-                        return -1; // cosmoO_indexObject failed and threw an error
                 } else if (obj->type == COBJ_TABLE) {
                     CObjTable *tbl = (CObjTable *)obj;
                     CValue *val = cosmoT_insert(state, &tbl->tbl, *key);
 
                     if (!IS_NUMBER(*val)) {
                         cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(*val));
-                        return -1;
                     }
 
                     // pops tbl & key from stack
@@ -1260,7 +1227,6 @@ int cosmoV_execute(CState *state)
                 } else {
                     cosmoV_error(state, "No proto defined! Couldn't __index from type %s",
                                  cosmoV_typeStr(*temp));
-                    return -1;
                 }
             }
             CASE(OP_INCOBJECT) :
@@ -1275,8 +1241,7 @@ int cosmoV_execute(CState *state)
                     CObj *obj = cosmoV_readRef(*temp);
                     CValue val;
 
-                    if (!cosmoV_rawget(state, obj, ident, &val))
+                    cosmoV_rawget(state, obj, ident, &val);
-                        return -1;
 
                     // pop the object off the stack
                     cosmoV_pop(state);
@@ -1284,16 +1249,13 @@ int cosmoV_execute(CState *state)
                     // check that it's a number value
                     if (IS_NUMBER(val)) {
                         cosmoV_pushValue(state, val); // pushes old value onto the stack :)
-                        if (!cosmoV_rawset(state, obj, ident,
+                        cosmoV_rawset(state, obj, ident,
-                                           cosmoV_newNumber(cosmoV_readNumber(val) + inc)))
+                                      cosmoV_newNumber(cosmoV_readNumber(val) + inc));
-                            return -1;
                     } else {
                         cosmoV_error(state, "Expected number, got %s!", cosmoV_typeStr(val));
-                        return -1;
                     }
                 } else {
                     cosmoV_error(state, "Couldn't set a field on type %s!", cosmoV_typeStr(*temp));
-                    return -1;
                 }
             }
             CASE(OP_EQUAL) :

src/cvm.h

@@ -33,14 +33,14 @@ COSMO_API CObjObject *cosmoV_makeObject(CState *state, int pairs);
 COSMO_API void cosmoV_makeTable(CState *state, int pairs);
 COSMO_API void cosmoV_concat(CState *state, int vals);
 COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...);
-COSMO_API void cosmoV_printError(CState *state, CObjError *err);
+COSMO_API void cosmoV_printBacktrace(CState *state, CObjError *err);
 COSMO_API void cosmoV_throw(CState *state);
 COSMO_API void cosmoV_error(CState *state, const char *format, ...);
-COSMO_API void cosmo_insert(CState *state, int indx, CValue val);
+COSMO_API void cosmoV_insert(CState *state, int indx, CValue val);
 
 /*
     Sets the default proto objects for the passed objType. Also walks through the object heap and
-   updates protos for the passed objType if that CObj* has no proto.
+    updates protos for the passed objType if that CObj* has no proto.
 
     returns true if replacing a previously registered proto object for this type
 */
@@ -67,27 +67,21 @@ COSMO_API bool cosmoV_compileString(CState *state, const char *src, const char *
 COSMO_API bool cosmoV_undump(CState *state, cosmo_Reader reader, const void *ud);
 
 /*
-    expects object to be pushed, then the key.
+    expects object to be pushed, then the key. pops the key & object and pushes the value
-
-    returns false if an error was thrown, returns true if the value was pushed onto the stack and
-   the object and key were popped
 */
-COSMO_API bool cosmoV_get(CState *state);
+COSMO_API void cosmoV_get(CState *state);
 
 /*
-    expects object to be pushed, then the key, and finally the new value.
+    expects object to be pushed, then the key, and finally the new value. pops the object, key &
-
+   value
-    returns false if an error was thrown, returns true if the value was set and the object key, and
-   value were popped
 */
-COSMO_API bool cosmoV_set(CState *state);
+COSMO_API void cosmoV_set(CState *state);
 
 // wraps the closure into a CObjMethod, so the function is called as an invoked method
-COSMO_API bool cosmoV_getMethod(CState *state, CObj *obj, CValue key, CValue *val);
+COSMO_API void cosmoV_getMethod(CState *state, CObj *obj, CValue key, CValue *val);
 
-// clears the stack, callstack and restores the state into a usable state after a calloverflow or
+// check if the value at the top of the stack is a <obj> user type
-// another hard to recover error (keeps the global table intact)
+COSMO_API bool cosmoV_isValueUserType(CState *state, CValue val, int userType);
-COSMO_API bool cosmoV_restore(CState *state);
 
 // nice to have wrappers
 

util/linenoise-win32.c

@@ -0,0 +1,379 @@
+
+/* this code is not standalone
+ * it is included into linenoise.c
+ * for windows.
+ * It is deliberately kept separate so that
+ * applications that have no need for windows
+ * support can omit this
+ */
+static DWORD orig_consolemode = 0;
+
+static int flushOutput(struct current *current);
+static void outputNewline(struct current *current);
+
+static void refreshStart(struct current *current)
+{
+    (void)current;
+}
+
+static void refreshEnd(struct current *current)
+{
+    (void)current;
+}
+
+static void refreshStartChars(struct current *current)
+{
+    assert(current->output == NULL);
+    /* We accumulate all output here */
+    current->output = sb_alloc();
+#ifdef USE_UTF8
+    current->ubuflen = 0;
+#endif
+}
+
+static void refreshNewline(struct current *current)
+{
+    DRL("<nl>");
+    outputNewline(current);
+}
+
+static void refreshEndChars(struct current *current)
+{
+    assert(current->output);
+    flushOutput(current);
+    sb_free(current->output);
+    current->output = NULL;
+}
+
+static int enableRawMode(struct current *current) {
+    DWORD n;
+    INPUT_RECORD irec;
+
+    current->outh = GetStdHandle(STD_OUTPUT_HANDLE);
+    current->inh = GetStdHandle(STD_INPUT_HANDLE);
+
+    if (!PeekConsoleInput(current->inh, &irec, 1, &n)) {
+        return -1;
+    }
+    if (getWindowSize(current) != 0) {
+        return -1;
+    }
+    if (GetConsoleMode(current->inh, &orig_consolemode)) {
+        SetConsoleMode(current->inh, ENABLE_PROCESSED_INPUT);
+    }
+#ifdef USE_UTF8
+    /* XXX is this the right thing to do? */
+    SetConsoleCP(65001);
+#endif
+    return 0;
+}
+
+static void disableRawMode(struct current *current)
+{
+    SetConsoleMode(current->inh, orig_consolemode);
+}
+
+void linenoiseClearScreen(void)
+{
+    /* XXX: This is ugly. Should just have the caller pass a handle */
+    struct current current;
+
+    current.outh = GetStdHandle(STD_OUTPUT_HANDLE);
+
+    if (getWindowSize(&current) == 0) {
+        COORD topleft = { 0, 0 };
+        DWORD n;
+
+        FillConsoleOutputCharacter(current.outh, ' ',
+            current.cols * current.rows, topleft, &n);
+        FillConsoleOutputAttribute(current.outh,
+            FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN,
+            current.cols * current.rows, topleft, &n);
+        SetConsoleCursorPosition(current.outh, topleft);
+    }
+}
+
+static void cursorToLeft(struct current *current)
+{
+    COORD pos;
+    DWORD n;
+
+    pos.X = 0;
+    pos.Y = (SHORT)current->y;
+
+    FillConsoleOutputAttribute(current->outh,
+        FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols, pos, &n);
+    current->x = 0;
+}
+
+#ifdef USE_UTF8
+static void flush_ubuf(struct current *current)
+{
+    COORD pos;
+    DWORD nwritten;
+    pos.Y = (SHORT)current->y;
+    pos.X = (SHORT)current->x;
+    SetConsoleCursorPosition(current->outh, pos);
+    WriteConsoleW(current->outh, current->ubuf, current->ubuflen, &nwritten, 0);
+    current->x += current->ubufcols;
+    current->ubuflen = 0;
+    current->ubufcols = 0;
+}
+
+static void add_ubuf(struct current *current, int ch)
+{
+    /* This code originally by: Author: Mark E. Davis, 1994. */
+    static const int halfShift  = 10; /* used for shifting by 10 bits */
+
+    static const DWORD halfBase = 0x0010000UL;
+    static const DWORD halfMask = 0x3FFUL;
+
+    #define UNI_SUR_HIGH_START  0xD800
+    #define UNI_SUR_HIGH_END    0xDBFF
+    #define UNI_SUR_LOW_START   0xDC00
+    #define UNI_SUR_LOW_END     0xDFFF
+
+    #define UNI_MAX_BMP 0x0000FFFF
+
+    if (ch > UNI_MAX_BMP) {
+        /* convert from unicode to utf16 surrogate pairs
+         * There is always space for one extra word in ubuf
+         */
+        ch -= halfBase;
+        current->ubuf[current->ubuflen++] = (WORD)((ch >> halfShift) + UNI_SUR_HIGH_START);
+        current->ubuf[current->ubuflen++] = (WORD)((ch & halfMask) + UNI_SUR_LOW_START);
+    }
+    else {
+        current->ubuf[current->ubuflen++] = ch;
+    }
+    current->ubufcols += utf8_width(ch);
+    if (current->ubuflen >= UBUF_MAX_CHARS) {
+        flush_ubuf(current);
+    }
+}
+#endif
+
+static int flushOutput(struct current *current)
+{
+    const char *pt = sb_str(current->output);
+    int len = sb_len(current->output);
+
+#ifdef USE_UTF8
+    /* convert utf8 in current->output into utf16 in current->ubuf
+     */
+    while (len) {
+        int ch;
+        int n = utf8_tounicode(pt, &ch);
+
+        pt += n;
+        len -= n;
+
+        add_ubuf(current, ch);
+    }
+    flush_ubuf(current);
+#else
+    DWORD nwritten;
+    COORD pos;
+
+    pos.Y = (SHORT)current->y;
+    pos.X = (SHORT)current->x;
+
+    SetConsoleCursorPosition(current->outh, pos);
+    WriteConsoleA(current->outh, pt, len, &nwritten, 0);
+
+    current->x += len;
+#endif
+
+    sb_clear(current->output);
+
+    return 0;
+}
+
+static int outputChars(struct current *current, const char *buf, int len)
+{
+    if (len < 0) {
+        len = strlen(buf);
+    }
+    assert(current->output);
+
+    sb_append_len(current->output, buf, len);
+
+    return 0;
+}
+
+static void outputNewline(struct current *current)
+{
+    /* On the last row output a newline to force a scroll */
+    if (current->y + 1 == current->rows) {
+        outputChars(current, "\n", 1);
+    }
+    flushOutput(current);
+    current->x = 0;
+    current->y++;
+}
+
+static void setOutputHighlight(struct current *current, const int *props, int nprops)
+{
+    int colour = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN;
+    int bold = 0;
+    int reverse = 0;
+    int i;
+
+    for (i = 0; i < nprops; i++) {
+        switch (props[i]) {
+            case 0:
+               colour = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN;
+               bold = 0;
+               reverse = 0;
+               break;
+            case 1:
+               bold = FOREGROUND_INTENSITY;
+               break;
+            case 7:
+               reverse = 1;
+               break;
+            case 30:
+               colour = 0;
+               break;
+            case 31:
+               colour = FOREGROUND_RED;
+               break;
+            case 32:
+               colour = FOREGROUND_GREEN;
+               break;
+            case 33:
+               colour = FOREGROUND_RED | FOREGROUND_GREEN;
+               break;
+            case 34:
+               colour = FOREGROUND_BLUE;
+               break;
+            case 35:
+               colour = FOREGROUND_RED | FOREGROUND_BLUE;
+               break;
+            case 36:
+               colour = FOREGROUND_BLUE | FOREGROUND_GREEN;
+               break;
+            case 37:
+               colour = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN;
+               break;
+        }
+    }
+
+    flushOutput(current);
+
+    if (reverse) {
+        SetConsoleTextAttribute(current->outh, BACKGROUND_INTENSITY);
+    }
+    else {
+        SetConsoleTextAttribute(current->outh, colour | bold);
+    }
+}
+
+static void eraseEol(struct current *current)
+{
+    COORD pos;
+    DWORD n;
+
+    pos.X = (SHORT) current->x;
+    pos.Y = (SHORT) current->y;
+
+    FillConsoleOutputCharacter(current->outh, ' ', current->cols - current->x, pos, &n);
+}
+
+static void setCursorXY(struct current *current)
+{
+    COORD pos;
+
+    pos.X = (SHORT) current->x;
+    pos.Y = (SHORT) current->y;
+
+    SetConsoleCursorPosition(current->outh, pos);
+}
+
+
+static void setCursorPos(struct current *current, int x)
+{
+    current->x = x;
+    setCursorXY(current);
+}
+
+static void cursorUp(struct current *current, int n)
+{
+    current->y -= n;
+    setCursorXY(current);
+}
+
+static void cursorDown(struct current *current, int n)
+{
+    current->y += n;
+    setCursorXY(current);
+}
+
+static int fd_read(struct current *current)
+{
+    while (1) {
+        INPUT_RECORD irec;
+        DWORD n;
+        if (WaitForSingleObject(current->inh, INFINITE) != WAIT_OBJECT_0) {
+            break;
+        }
+        if (!ReadConsoleInputW(current->inh, &irec, 1, &n)) {
+            break;
+        }
+        if (irec.EventType == KEY_EVENT) {
+            KEY_EVENT_RECORD *k = &irec.Event.KeyEvent;
+            if (k->bKeyDown || k->wVirtualKeyCode == VK_MENU) {
+                if (k->dwControlKeyState & ENHANCED_KEY) {
+                    switch (k->wVirtualKeyCode) {
+                     case VK_LEFT:
+                        return SPECIAL_LEFT;
+                     case VK_RIGHT:
+                        return SPECIAL_RIGHT;
+                     case VK_UP:
+                        return SPECIAL_UP;
+                     case VK_DOWN:
+                        return SPECIAL_DOWN;
+                     case VK_INSERT:
+                        return SPECIAL_INSERT;
+                     case VK_DELETE:
+                        return SPECIAL_DELETE;
+                     case VK_HOME:
+                        return SPECIAL_HOME;
+                     case VK_END:
+                        return SPECIAL_END;
+                     case VK_PRIOR:
+                        return SPECIAL_PAGE_UP;
+                     case VK_NEXT:
+                        return SPECIAL_PAGE_DOWN;
+                     case VK_RETURN:
+                        return k->uChar.UnicodeChar;
+                    }
+                }
+                /* Note that control characters are already translated in AsciiChar */
+                else if (k->wVirtualKeyCode == VK_CONTROL)
+                    continue;
+                else {
+                    return k->uChar.UnicodeChar;
+                }
+            }
+        }
+    }
+    return -1;
+}
+
+static int getWindowSize(struct current *current)
+{
+    CONSOLE_SCREEN_BUFFER_INFO info;
+    if (!GetConsoleScreenBufferInfo(current->outh, &info)) {
+        return -1;
+    }
+    current->cols = info.dwSize.X;
+    current->rows = info.dwSize.Y;
+    if (current->cols <= 0 || current->rows <= 0) {
+        current->cols = 80;
+        return -1;
+    }
+    current->y = info.dwCursorPosition.Y;
+    current->x = info.dwCursorPosition.X;
+    return 0;
+}

util/linenoise.h

@@ -1,14 +1,12 @@
-/* linenoise.h -- VERSION 1.0
+/* linenoise.h -- guerrilla line editing library against the idea that a
- *
+ * line editing lib needs to be 20,000 lines of C code.
- * Guerrilla line editing library against the idea that a line editing lib
- * needs to be 20,000 lines of C code.
  *
  * See linenoise.c for more information.
  *
  * ------------------------------------------------------------------------
  *
- * Copyright (c) 2010-2023, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
  *
  * All rights reserved.
  *
@@ -43,68 +41,109 @@
 extern "C" {
 #endif
 
-#include <stddef.h> /* For size_t. */
+#include <inttypes.h>
-
+#include <string.h>
-extern char *linenoiseEditMore;
-
-/* The linenoiseState structure represents the state during line editing.
- * We pass this state to functions implementing specific editing
- * functionalities. */
-struct linenoiseState {
-    int in_completion;  /* The user pressed TAB and we are now in completion
-                         * mode, so input is handled by completeLine(). */
-    size_t completion_idx; /* Index of next completion to propose. */
-    int ifd;            /* Terminal stdin file descriptor. */
-    int ofd;            /* Terminal stdout file descriptor. */
-    char *buf;          /* Edited line buffer. */
-    size_t buflen;      /* Edited line buffer size. */
-    const char *prompt; /* Prompt to display. */
-    size_t plen;        /* Prompt length. */
-    size_t pos;         /* Current cursor position. */
-    size_t oldpos;      /* Previous refresh cursor position. */
-    size_t len;         /* Current edited line length. */
-    size_t cols;        /* Number of columns in terminal. */
-    size_t oldrows;     /* Rows used by last refrehsed line (multiline mode) */
-    int history_index;  /* The history index we are currently editing. */
-};
 
+#ifndef NO_COMPLETION
 typedef struct linenoiseCompletions {
   size_t len;
   char **cvec;
 } linenoiseCompletions;
 
-/* Non blocking API. */
+/*
-int linenoiseEditStart(struct linenoiseState *l, int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt);
+ * The callback type for tab completion handlers.
-char *linenoiseEditFeed(struct linenoiseState *l);
+ */
-void linenoiseEditStop(struct linenoiseState *l);
+typedef void(linenoiseCompletionCallback)(const char *prefix, linenoiseCompletions *comp, void *userdata);
-void linenoiseHide(struct linenoiseState *l);
-void linenoiseShow(struct linenoiseState *l);
 
-/* Blocking API. */
+/*
+ * Sets the current tab completion handler and returns the previous one, or NULL
+ * if no prior one has been set.
+ */
+linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *comp, void *userdata);
+
+/*
+ * Adds a copy of the given string to the given completion list. The copy is owned
+ * by the linenoiseCompletions object.
+ */
+void linenoiseAddCompletion(linenoiseCompletions *comp, const char *str);
+
+typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold, void *userdata);
+typedef void(linenoiseFreeHintsCallback)(void *hint, void *userdata);
+void linenoiseSetHintsCallback(linenoiseHintsCallback *callback, void *userdata);
+void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *callback);
+
+#endif
+
+/*
+ * Prompts for input using the given string as the input
+ * prompt. Returns when the user has tapped ENTER or (on an empty
+ * line) EOF (Ctrl-D on Unix, Ctrl-Z on Windows). Returns either
+ * a copy of the entered string (for ENTER) or NULL (on EOF).  The
+ * caller owns the returned string and must eventually free() it.
+ */
 char *linenoise(const char *prompt);
-void linenoiseFree(void *ptr);
 
-/* Completion API. */
+/**
-typedef void(linenoiseCompletionCallback)(const char *, linenoiseCompletions *);
+ * Like linenoise() but starts with an initial buffer.
-typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold);
+ */
-typedef void(linenoiseFreeHintsCallback)(void *);
+char *linenoiseWithInitial(const char *prompt, const char *initial);
-void linenoiseSetCompletionCallback(linenoiseCompletionCallback *);
-void linenoiseSetHintsCallback(linenoiseHintsCallback *);
-void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *);
-void linenoiseAddCompletion(linenoiseCompletions *, const char *);
 
-/* History API. */
+/**
+ * Clear the screen.
+ */
+void linenoiseClearScreen(void);
+
+/*
+ * Adds a copy of the given line of the command history.
+ */
 int linenoiseHistoryAdd(const char *line);
+
+/*
+ * Sets the maximum length of the command history, in lines.
+ * If the history is currently longer, it will be trimmed,
+ * retaining only the most recent entries. If len is 0 or less
+ * then this function does nothing.
+ */
 int linenoiseHistorySetMaxLen(int len);
+
+/*
+ * Returns the current maximum length of the history, in lines.
+ */
+int linenoiseHistoryGetMaxLen(void);
+
+/*
+ * Saves the current contents of the history to the given file.
+ * Returns 0 on success.
+ */
 int linenoiseHistorySave(const char *filename);
+
+/*
+ * Replaces the current history with the contents
+ * of the given file.  Returns 0 on success.
+ */
 int linenoiseHistoryLoad(const char *filename);
 
-/* Other utilities. */
+/*
-void linenoiseClearScreen(void);
+ * Frees all history entries, clearing the history.
-void linenoiseSetMultiLine(int ml);
+ */
-void linenoisePrintKeyCodes(void);
+void linenoiseHistoryFree(void);
-void linenoiseMaskModeEnable(void);
+
-void linenoiseMaskModeDisable(void);
+/*
+ * Returns a pointer to the list of history entries, writing its
+ * length to *len if len is not NULL. The memory is owned by linenoise
+ * and must not be freed.
+ */
+char **linenoiseHistory(int *len);
+
+/*
+ * Returns the number of display columns in the current terminal.
+ */
+int linenoiseColumns(void);
+
+/**
+ * Enable or disable multiline mode (disabled by default)
+ */
+void linenoiseSetMultiLine(int enableml);
 
 #ifdef __cplusplus
 }