Merge pull request 'Update unstable with master' (#18) from master into unstable

Reviewed-on: #18

README.md

@@ -82,7 +82,7 @@ build
         - [x] Return values (type checked)
         - [x] Arguments for functions
         - [x] Jumping within functions
-    - [ ] Custom data structures
+    - [x] Custom data structures
     - [ ] Working with external libraries
 
 ## Debugger
@@ -102,7 +102,7 @@ Commands:
 
 CGround now includes an experimental Ground -> x86_64 Linux ASM compiler. You can try it by adding the `-c` flag when running Ground. This will print the generated ASM to the console.
 
-At present only the `int` data type is supported.
+At present only the `int`, `char`, and `bool` data types are supported.
 
 Supported instructions so far:
 
@@ -110,4 +110,14 @@ Supported instructions so far:
 * add
 * subtract
 * multiply
+* equal
+* inequal
+* greater
+* lesser
+* not
+* jump
+* if
+* @ (label creation)
+* print
+* println
 * end

include/groundvm.h

@@ -14,7 +14,7 @@
 #include <uthash.h>
 
 typedef enum GroundInstType {
-    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
+    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, GETFIELD, SETFIELD, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
 } GroundInstType;
 
 typedef enum GroundValueType {
@@ -31,6 +31,7 @@ typedef enum ListAccessStatus {
 
 struct GroundValue;
 struct GroundFunction;
+struct GroundStruct;
 
 struct List;
 
@@ -58,7 +59,8 @@ typedef struct GroundError {
  */
 typedef struct GroundValue {
     GroundValueType type;
-    union {
+    struct GroundStruct* customType;
+    struct {
         int64_t intVal;
         double doubleVal;
         char* stringVal;
@@ -170,6 +172,7 @@ GroundProgram groundCreateProgram();
 void groundAddInstructionToProgram(GroundProgram* program, GroundInstruction instruction);
 GroundValue groundRunProgram(GroundProgram* program);
 void groundPrintProgram(GroundProgram* program); 
+char* groundCompileProgram(GroundProgram* program);
 
 GroundInstruction groundCreateInstruction(GroundInstType type);
 void groundAddValueToInstruction(GroundInstruction* inst, GroundValue value);

src/compiler.c

@@ -4,6 +4,7 @@
 #include "include/estr.h"
 #include <stdint.h>
 #include <inttypes.h>
+#include <stdio.h>
 
 VariableTable createVariableTable() {
     VariableTable vt;
@@ -13,7 +14,7 @@ VariableTable createVariableTable() {
     return vt;
 } 
 
-void addVtVariable(VariableTable* vt, const char* name) {
+void addVtVariable(VariableTable* vt, const char* name, GroundValueType type) {
     // check if it already exists
     for (size_t i = 0; i < vt->count; i++) {
         if (strcmp(vt->vars[i].name, name) == 0) {
@@ -29,10 +30,20 @@ void addVtVariable(VariableTable* vt, const char* name) {
 
     // add the variable
     strcpy(vt->vars[vt->count].name, name);
+    vt->vars[vt->count].type = type;
     vt->vars[vt->count].offset = vt->count * 8;
     vt->count++;
 }
 
+VariableInfo* getVariable(VariableTable* vt, const char* name) {
+    for (size_t i = 0; i < vt->count; i++) {
+        if (strcmp(vt->vars[i].name, name) == 0) {
+            return &vt->vars[i];
+        }
+    }
+    return NULL;
+}
+
 int getVariablePos(VariableTable* vt, const char* name) {
     for (size_t i = 0; i < vt->count; i++) {
         if (strcmp(vt->vars[i].name, name) == 0) {
@@ -42,6 +53,318 @@ int getVariablePos(VariableTable* vt, const char* name) {
     return -1;
 }
 
+DoubleTable createDoubleTable() {
+    DoubleTable dt;
+    dt.count = 0;
+    dt.capacity = 16;
+    dt.constants = malloc(sizeof(DoubleConstant) * 16);
+    return dt;
+}
+
+char* addDoubleConstant(DoubleTable* dt, Estr* rodata, double value, int* counter) {
+    for (size_t i = 0; i < dt->count; i++) {
+        if (dt->constants[i].value == value) {
+            return dt->constants[i].label;
+        }
+    }
+
+    if (dt->count >= dt->capacity) {
+        dt->capacity = dt->capacity == 0 ? 16 : dt->capacity * 2; 
+        dt->constants = realloc(dt->constants, sizeof(DoubleConstant) * dt->capacity);
+    }
+
+    char label[64];
+    snprintf(label, sizeof(label), "float_const_%d", (*counter)++);
+    strcpy(dt->constants[dt->count].label, label);
+    dt->constants[dt->count].value = value;
+    dt->count++;
+
+    char line[128];
+    snprintf(line, 128, "%s: dq %.17g ; double constant\n", label, value);
+    APPEND_ESTR((*rodata), line);
+
+    return dt->constants[dt->count - 1].label;
+}
+
+GroundValueType getInstructionReturnType(GroundInstruction* gi, VariableTable* table) {
+    switch (gi->type) {
+        case JUMP:
+        case PRINT:
+        case PRINTLN:
+        case END:
+        case IF:
+        case RETURN:
+        case ENDFUN:
+        case PUSHARG:
+        case CALL: // FIXME do this when functions are added
+        case USE:
+        case EXTERN:
+        case CREATELABEL:
+        case PAUSE:
+        case DROP:
+        case ERRORCMD:
+        case ENDSTRUCT:
+        case INIT: // FIXME do this when objects are added
+        case GETFIELD: // FIXME do this when objects are added
+        case SETFIELD: // FIXME do this when objects are added
+        case DIVIDE: // FIXME do this when division is added
+        case SETLISTAT:
+        case GETLISTAT: // FIXME do this when lists are getting implemented
+        case LISTAPPEND: {
+            return NONE;
+        }
+        case TOSTRING:
+        case GETTYPE:
+        case INPUT: {
+            return STRING;
+        }
+        case STOI:
+        case GETLISTSIZE:
+        case GETSTRSIZE: {
+            return INT;
+        }
+        case STOD: {
+            return DOUBLE;
+        }
+        case EQUAL:
+        case INEQUAL:
+        case GREATER:
+        case LESSER:
+        case NOT:
+        case EXISTS: {
+            return BOOL;
+        }
+        case GETSTRCHARAT: {
+            return CHAR;
+        }
+        case SETLIST: {
+            return LIST;
+        }
+        case FUN: {
+            return FUNCTION;
+        }
+        case STRUCT: {
+            return STRUCTVAL;
+        }
+        case SET: {
+            if (gi->args.length == 2) {
+                if (gi->args.args[1].type == VALUE) {
+                    return gi->args.args[1].value.value.type;
+                } else if (gi->args.args[1].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[1].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    return var->type;
+                } else {
+                    return NONE;
+                }
+            } else {
+                return NONE;
+            }
+        }
+        case ADD: {
+            if (gi->args.length == 3) {
+                GroundValueType leftType;
+                GroundValueType rightType;
+                if (gi->args.args[0].type == VALUE) {
+                    leftType = gi->args.args[0].value.value.type;
+                } else if (gi->args.args[0].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[0].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    leftType = var->type;
+                } else {
+                    return NONE;
+                }
+                if (gi->args.args[1].type == VALUE) {
+                    rightType = gi->args.args[1].value.value.type;
+                } else if (gi->args.args[1].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[1].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    rightType = var->type;
+                } else {
+                    return NONE;
+                }
+
+                if (leftType == STRING) {
+                    if (rightType == STRING) {
+                        return STRING;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (leftType == DOUBLE) {
+                    if (rightType == DOUBLE || rightType == INT) {
+                        return DOUBLE;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (rightType == DOUBLE) {
+                    if (leftType == DOUBLE || leftType == INT) {
+                        return DOUBLE;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (rightType == INT && leftType == INT) {
+                    return INT;
+                }
+                return NONE;
+            } else {
+                return NONE;
+            }
+        }
+        case SUBTRACT: {
+            if (gi->args.length == 3) {
+                GroundValueType leftType;
+                GroundValueType rightType;
+                if (gi->args.args[0].type == VALUE) {
+                    leftType = gi->args.args[0].value.value.type;
+                } else if (gi->args.args[0].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[0].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    leftType = var->type;
+                } else {
+                    return NONE;
+                }
+                if (gi->args.args[1].type == VALUE) {
+                    rightType = gi->args.args[1].value.value.type;
+                } else if (gi->args.args[1].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[1].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    rightType = var->type;
+                } else {
+                    return NONE;
+                }
+
+                if (leftType == DOUBLE) {
+                    if (rightType == DOUBLE || rightType == INT) {
+                        return DOUBLE;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (rightType == DOUBLE) {
+                    if (leftType == DOUBLE || leftType == INT) {
+                        return DOUBLE;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (rightType == INT && leftType == INT) {
+                    return INT;
+                }
+                return NONE;
+            } else {
+                return NONE;
+            }
+        }
+        case MULTIPLY: {
+            if (gi->args.length == 3) {
+                GroundValueType leftType;
+                GroundValueType rightType;
+                if (gi->args.args[0].type == VALUE) {
+                    leftType = gi->args.args[0].value.value.type;
+                } else if (gi->args.args[0].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[0].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    leftType = var->type;
+                } else {
+                    return NONE;
+                }
+                if (gi->args.args[1].type == VALUE) {
+                    rightType = gi->args.args[1].value.value.type;
+                } else if (gi->args.args[1].type == VALREF) {
+                    VariableInfo* var = getVariable(table, gi->args.args[1].value.refName);
+                    if (var == NULL) {
+                        return NONE;
+                    }
+                    rightType = var->type;
+                } else {
+                    return NONE;
+                }
+
+                if (leftType == DOUBLE) {
+                    if (rightType == DOUBLE || rightType == INT) {
+                        return DOUBLE;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (rightType == DOUBLE) {
+                    if (leftType == DOUBLE || leftType == INT) {
+                        return DOUBLE;
+                    } else {
+                        return NONE;
+                    }
+                }
+                if (rightType == INT && leftType == INT) {
+                    return INT;
+                }
+                return NONE;
+            } else {
+                return NONE;
+            }
+        }
+    }
+    return INT;
+}
+
+char* processValueString(GroundArg arg, VariableTable* vt, GroundValueType* outType, DoubleTable* dt, Estr* rodata, int* doubleCounter) {
+    if (arg.type == VALREF) {
+        VariableInfo* var = getVariable(vt, arg.value.refName);
+        if (var && outType) *outType = var->type;
+        char* buf = malloc(260);
+        snprintf(buf, 260, "[%s]", arg.value.refName);
+        return buf;
+    }
+    if (arg.type == VALUE) {
+        if (outType) *outType = arg.value.value.type;
+        switch(arg.value.value.type) {
+            case INT: {
+                char* buf = malloc(64);
+                snprintf(buf, 64, "%" PRId64, arg.value.value.data.intVal);
+                return buf;
+                break;
+            }
+            case DOUBLE: {
+                char* label = addDoubleConstant(dt, rodata, arg.value.value.data.doubleVal, doubleCounter);
+                char* buf = malloc(128);
+                snprintf(buf, 128, "[rel %s]", label);
+                return buf;
+                break;
+            }
+            case BOOL:
+                return arg.value.value.data.boolVal ? "1" : "0";
+                break;
+            case CHAR: {
+                char* buf = malloc(8);
+                snprintf(buf, 8, "%d", (int)arg.value.value.data.charVal);
+                return buf;
+                break;
+            }
+            default: {
+                printf("For now, only int, bool, and char are supported data types in the compiler.");
+                exit(1);
+                break;
+            }
+        }
+    }
+    return NULL;
+}
+
+/*
 char* processValueString(GroundArg arg) {
     if (arg.type == VALREF) {
         char* buf = malloc(sizeof(char) * 260);
@@ -49,20 +372,95 @@ char* processValueString(GroundArg arg) {
         return buf;
     }
     if (arg.type == VALUE) {
-        if (arg.value.value.type != INT) {
-            printf("Only int is supported right now");
-            exit(1);
+        switch (arg.value.value.type) {
+            case INT: {
+                char* buf = malloc(sizeof(char) * 64);
+                snprintf(buf, sizeof(char) * 260, "%" PRId64, arg.value.value.data.intVal);
+                return buf;
+                break;
+            }
+            case BOOL: {
+                return arg.value.value.data.boolVal ? "1" : "0";
+                break;
+            }
+            case CHAR: {
+                char* buf = malloc(8);
+                snprintf(buf, 8, "%d", (int) arg.value.value.data.charVal);
+                return buf;
+                break;
+            }
+            default: {
+                printf("For now, only int, bool, and char are supported data types in the compiler.");
+                exit(1);
+                break;
+            }
         }
-        char* buf = malloc(sizeof(char) * 64);
-        snprintf(buf, sizeof(char) * 260, "%" PRId64, arg.value.value.data.intVal);
-        return buf;
     }
     return NULL;
 }
+*/
 
 char* compileGroundProgram(GroundProgram* program) {
     Estr start = CREATE_ESTR("global _start\nsection .text\n_start:\n");
     Estr data = CREATE_ESTR("section .bss\n");
+    Estr helpers = CREATE_ESTR("");
+    Estr rodata = CREATE_ESTR("section .rodata\n");
+    APPEND_ESTR(rodata, "  newline_char: db 10\n");
+    APPEND_ESTR(rodata, "  space_char: db 32\n");
+    DoubleTable doubleTable = createDoubleTable();
+    int doubleConstCounter = 0;
+
+    APPEND_ESTR(helpers, "\n; Helper: Print integer in rax\n");
+    APPEND_ESTR(helpers, "print_int:\n");
+    APPEND_ESTR(helpers, "  push rbp\n");
+    APPEND_ESTR(helpers, "  mov rbp, rsp\n");
+    APPEND_ESTR(helpers, "  sub rsp, 32          ; Allocate buffer on stack\n");
+    APPEND_ESTR(helpers, "  mov rdi, rsp         ; RDI = buffer pointer\n");
+    APPEND_ESTR(helpers, "  add rdi, 31          ; Point to end of buffer\n");
+    APPEND_ESTR(helpers, "  mov byte [rdi], 0    ; Null terminator\n");
+    APPEND_ESTR(helpers, "  dec rdi\n");
+    APPEND_ESTR(helpers, "  mov rbx, 10          ; Divisor\n");
+    APPEND_ESTR(helpers, "  test rax, rax\n");
+    APPEND_ESTR(helpers, "  jns .positive\n");
+    APPEND_ESTR(helpers, "  neg rax              ; Make positive\n");
+    APPEND_ESTR(helpers, "  push rax\n");
+    APPEND_ESTR(helpers, "  mov byte [rdi], '-'\n");
+    APPEND_ESTR(helpers, "  dec rdi\n");
+    APPEND_ESTR(helpers, "  pop rax\n");
+    APPEND_ESTR(helpers, ".positive:\n");
+    APPEND_ESTR(helpers, "  xor rcx, rcx         ; Digit counter\n");
+    APPEND_ESTR(helpers, ".convert_loop:\n");
+    APPEND_ESTR(helpers, "  xor rdx, rdx\n");
+    APPEND_ESTR(helpers, "  div rbx              ; rax = rax/10, rdx = remainder\n");
+    APPEND_ESTR(helpers, "  add dl, '0'          ; Convert to ASCII\n");
+    APPEND_ESTR(helpers, "  mov [rdi], dl\n");
+    APPEND_ESTR(helpers, "  dec rdi\n");
+    APPEND_ESTR(helpers, "  inc rcx\n");
+    APPEND_ESTR(helpers, "  test rax, rax\n");
+    APPEND_ESTR(helpers, "  jnz .convert_loop\n");
+    APPEND_ESTR(helpers, "  inc rdi              ; Point back to first digit\n");
+    APPEND_ESTR(helpers, "  ; Now print the string\n");
+    APPEND_ESTR(helpers, "  mov rax, 1           ; sys_write\n");
+    APPEND_ESTR(helpers, "  mov rsi, rdi         ; Buffer\n");
+    APPEND_ESTR(helpers, "  mov rdx, rcx         ; Length\n");
+    APPEND_ESTR(helpers, "  mov rdi, 1           ; stdout\n");
+    APPEND_ESTR(helpers, "  syscall\n");
+    APPEND_ESTR(helpers, "  mov rsp, rbp\n");
+    APPEND_ESTR(helpers, "  pop rbp\n");
+    APPEND_ESTR(helpers, "  ret\n");
+
+    APPEND_ESTR(helpers, "\n; Helper: Print string at address in rax, length in rbx\n");
+    APPEND_ESTR(helpers, "print_string:\n");
+    APPEND_ESTR(helpers, "  push rax\n");
+    APPEND_ESTR(helpers, "  push rbx\n");
+    APPEND_ESTR(helpers, "  mov rdi, 1           ; stdout\n");
+    APPEND_ESTR(helpers, "  mov rsi, rax         ; String address\n");
+    APPEND_ESTR(helpers, "  mov rdx, rbx         ; Length\n");
+    APPEND_ESTR(helpers, "  mov rax, 1           ; sys_write\n");
+    APPEND_ESTR(helpers, "  syscall\n");
+    APPEND_ESTR(helpers, "  pop rbx\n");
+    APPEND_ESTR(helpers, "  pop rax\n");
+    APPEND_ESTR(helpers, "  ret\n");
 
     VariableTable varTable = createVariableTable();
 
@@ -71,13 +469,13 @@ char* compileGroundProgram(GroundProgram* program) {
         GroundInstruction gi = program->instructions[i];
         for (size_t j = 0; j < gi.args.length; j++) {
             if (gi.args.args[j].type == DIRREF) {
-                addVtVariable(&varTable, gi.args.args[j].value.refName);
+                addVtVariable(&varTable, gi.args.args[j].value.refName, getInstructionReturnType(&gi, &varTable));
             }
         }
     }
 
     // Create data section
-    for (size_t i = 0; i < program->size; i++) {
+    for (size_t i = 0; i < varTable.count; i++) {
         if (strcmp(varTable.vars[i].name, "") == 0) {
             continue;
         }
@@ -90,6 +488,11 @@ char* compileGroundProgram(GroundProgram* program) {
     for (size_t i = 0; i < program->size; i++) {
         GroundInstruction gi = program->instructions[i];
         switch (gi.type) {
+            case CREATELABEL: {
+                APPEND_ESTR(start, gi.args.args[0].value.refName);
+                APPEND_ESTR(start, ":\n");
+                break;
+            }
             case SET: {
                 if (gi.args.length < 2) {
                     runtimeError(TOO_FEW_ARGS, "Expecting 2 args", &gi, i);
@@ -100,7 +503,7 @@ char* compileGroundProgram(GroundProgram* program) {
                 if (gi.args.args[0].type != DIRREF) {
                     runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 1", &gi, i);
                 }
-                if (gi.args.args[1].type != VALUE) {
+                if (gi.args.args[1].type != VALUE && gi.args.args[1].type != VALREF) {
                     runtimeError(ARG_TYPE_MISMATCH, "Expecting a Value for arg 2", &gi, i);
                 }
 
@@ -108,7 +511,7 @@ char* compileGroundProgram(GroundProgram* program) {
 
                 APPEND_ESTR(start, "  ; set\n")
                 APPEND_ESTR(start, "  mov rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[1]));
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
                 APPEND_ESTR(start, "\n");
                 APPEND_ESTR(start, "  mov [");
                 APPEND_ESTR(start, varName);
@@ -116,6 +519,80 @@ char* compileGroundProgram(GroundProgram* program) {
 
                 break;
             }
+            case JUMP: {
+                if (gi.args.length < 1) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 1 arg", &gi, i);
+                }
+                if (gi.args.length > 1) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 1 arg", &gi, i);
+                }
+                if (gi.args.args[0].type != LINEREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a LineRef", &gi, i);
+                }
+
+                char* labelName = gi.args.args[0].value.refName;
+
+                APPEND_ESTR(start, "  ; jump\n");
+                APPEND_ESTR(start, "  jmp ");
+                APPEND_ESTR(start, labelName);
+                APPEND_ESTR(start, "\n");
+
+                break;
+            }
+            case IF: {
+                if (gi.args.length < 2) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args", &gi, i);
+                }
+                if (gi.args.length > 2) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int (for now) for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != LINEREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a LineRef", &gi, i);
+                }
+
+                char* labelName = gi.args.args[1].value.refName;
+
+                APPEND_ESTR(start, "  ; if\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  test rax, rax\n");
+                APPEND_ESTR(start, "  jnz ");
+                APPEND_ESTR(start, labelName);
+                APPEND_ESTR(start, "\n");
+
+                break;
+            }
+            case NOT: {
+                if (gi.args.length < 2) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args", &gi, i);
+                }
+                if (gi.args.length > 2) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int (for now) for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != DIRREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef", &gi, i);
+                }
+
+                char* varName = gi.args.args[1].value.refName;
+
+                APPEND_ESTR(start, "  ; not\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  xor rax, 1\n");
+                APPEND_ESTR(start, "  mov [");
+                APPEND_ESTR(start, varName);
+                APPEND_ESTR(start, "], rax\n");
+
+                break;
+            }
             case ADD: {
                 if (gi.args.length < 3) {
                     runtimeError(TOO_FEW_ARGS, "Expecting 2 args for add instruction", &gi, i);
@@ -133,17 +610,55 @@ char* compileGroundProgram(GroundProgram* program) {
                     runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", &gi, i);
                 }
 
-                char* varName= gi.args.args[2].value.refName;
-                APPEND_ESTR(start, "  ; add\n");
-                APPEND_ESTR(start, "  mov rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[0]));
-                APPEND_ESTR(start, "\n");
-                APPEND_ESTR(start, "  add rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[1]));
-                APPEND_ESTR(start, "\n");
-                APPEND_ESTR(start, "  mov [");
-                APPEND_ESTR(start, varName);
-                APPEND_ESTR(start, "], rax\n");
+                GroundValueType leftType, rightType;
+
+                char* left = processValueString(gi.args.args[0], &varTable, &leftType, &doubleTable, &rodata, &doubleConstCounter);
+                char* right = processValueString(gi.args.args[1], &varTable, &rightType, &doubleTable, &rodata, &doubleConstCounter);
+                char* varName = gi.args.args[2].value.refName;
+
+                bool isDouble = (leftType == DOUBLE || rightType == DOUBLE);
+                
+                if (isDouble) {
+                    APPEND_ESTR(start, "  ; add (double)\n");
+                    
+                    if (leftType == INT) {
+                        APPEND_ESTR(start, "  mov rax, ");
+                        APPEND_ESTR(start, left);
+                        APPEND_ESTR(start, "\n");
+                        APPEND_ESTR(start, "  cvtsi2sd xmm0, rax  ; Convert int to double\n");
+                    } else {
+                        APPEND_ESTR(start, "  movsd xmm0, ");
+                        APPEND_ESTR(start, left);
+                        APPEND_ESTR(start, "\n");
+                    }
+                    
+                    if (rightType == INT) {
+                        APPEND_ESTR(start, "  mov rax, ");
+                        APPEND_ESTR(start, right);
+                        APPEND_ESTR(start, "\n");
+                        APPEND_ESTR(start, "  cvtsi2sd xmm1, rax  ; Convert int to double\n");
+                        APPEND_ESTR(start, "  addsd xmm0, xmm1\n");
+                    } else {
+                        APPEND_ESTR(start, "  addsd xmm0, ");
+                        APPEND_ESTR(start, right);
+                        APPEND_ESTR(start, "\n");
+                    }
+                    
+                    APPEND_ESTR(start, "  movsd [");
+                    APPEND_ESTR(start, varName);
+                    APPEND_ESTR(start, "], xmm0\n");
+                } else {
+                    APPEND_ESTR(start, "  ; add\n");
+                    APPEND_ESTR(start, "  mov rax, ");
+                    APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                    APPEND_ESTR(start, "\n");
+                    APPEND_ESTR(start, "  add rax, ");
+                    APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                    APPEND_ESTR(start, "\n");
+                    APPEND_ESTR(start, "  mov [");
+                    APPEND_ESTR(start, varName);
+                    APPEND_ESTR(start, "], rax\n");
+                }
                 break;
             }
             case SUBTRACT: {
@@ -166,10 +681,10 @@ char* compileGroundProgram(GroundProgram* program) {
                 char* varName= gi.args.args[2].value.refName;
                 APPEND_ESTR(start, "  ; subtract\n");
                 APPEND_ESTR(start, "  mov rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[0]));
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
                 APPEND_ESTR(start, "\n");
                 APPEND_ESTR(start, "  sub rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[1]));
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
                 APPEND_ESTR(start, "\n");
                 APPEND_ESTR(start, "  mov [");
                 APPEND_ESTR(start, varName);
@@ -194,18 +709,182 @@ char* compileGroundProgram(GroundProgram* program) {
                 }
 
                 char* varName= gi.args.args[2].value.refName;
-                APPEND_ESTR(start, "  ; add\n");
+                APPEND_ESTR(start, "  ; multiply\n");
                 APPEND_ESTR(start, "  mov rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[0]));
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
                 APPEND_ESTR(start, "\n");
                 APPEND_ESTR(start, "  imul rax, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[1]));
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
                 APPEND_ESTR(start, "\n");
                 APPEND_ESTR(start, "  mov [");
                 APPEND_ESTR(start, varName);
                 APPEND_ESTR(start, "], rax\n");
                 break;
             }
+            case EQUAL: {
+                if (gi.args.length < 3) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args for equal instruction", &gi, i);
+                }
+                if (gi.args.length > 3) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args for equal instruction", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != VALUE && gi.args.args[1].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 2", &gi, i);
+                }
+                if (gi.args.args[2].type != DIRREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", &gi, i);
+                }
+
+                char* varName= gi.args.args[2].value.refName;
+                APPEND_ESTR(start, "  ; equal\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  cmp rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  sete al\n");
+                APPEND_ESTR(start, "  movzx rax, al\n");
+                APPEND_ESTR(start, "  mov [");
+                APPEND_ESTR(start, varName);
+                APPEND_ESTR(start, "], rax\n");
+                break;
+            }
+            case INEQUAL: {
+                if (gi.args.length < 3) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args for inequal instruction", &gi, i);
+                }
+                if (gi.args.length > 3) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args for inequal instruction", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != VALUE && gi.args.args[1].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 2", &gi, i);
+                }
+                if (gi.args.args[2].type != DIRREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", &gi, i);
+                }
+
+                char* varName= gi.args.args[2].value.refName;
+                APPEND_ESTR(start, "  ; inequal\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  cmp rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  setne al\n");
+                APPEND_ESTR(start, "  movzx rax, al\n");
+                APPEND_ESTR(start, "  mov [");
+                APPEND_ESTR(start, varName);
+                APPEND_ESTR(start, "], rax\n");
+                break;
+            }
+            case GREATER: {
+                if (gi.args.length < 3) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args for greater instruction", &gi, i);
+                }
+                if (gi.args.length > 3) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args for greater instruction", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != VALUE && gi.args.args[1].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 2", &gi, i);
+                }
+                if (gi.args.args[2].type != DIRREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", &gi, i);
+                }
+
+                char* varName= gi.args.args[2].value.refName;
+                APPEND_ESTR(start, "  ; greater\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  cmp rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  setg al\n");
+                APPEND_ESTR(start, "  movzx rax, al\n");
+                APPEND_ESTR(start, "  mov [");
+                APPEND_ESTR(start, varName);
+                APPEND_ESTR(start, "], rax\n");
+                break;
+            }
+            case LESSER: {
+                if (gi.args.length < 3) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args for lesser instruction", &gi, i);
+                }
+                if (gi.args.length > 3) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args for lesser instruction", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != VALUE && gi.args.args[1].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int for arg 2", &gi, i);
+                }
+                if (gi.args.args[2].type != DIRREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", &gi, i);
+                }
+
+                char* varName= gi.args.args[2].value.refName;
+                APPEND_ESTR(start, "  ; lesser\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  cmp rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[1], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  setl al\n");
+                APPEND_ESTR(start, "  movzx rax, al\n");
+                APPEND_ESTR(start, "  mov [");
+                APPEND_ESTR(start, varName);
+                APPEND_ESTR(start, "], rax\n");
+                break;
+            }
+            case PRINT:
+            case PRINTLN: {
+                if (gi.args.length < 1) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 1 or more args", &gi, i);
+                }
+                
+                for (size_t j = 0; j < gi.args.length; j++) {
+                    if (gi.args.args[j].type != VALUE && gi.args.args[j].type != VALREF) {
+                        runtimeError(ARG_TYPE_MISMATCH, "Expecting a Value", &gi, i);
+                    }
+                    if (j > 0) {
+                        // Print space between arguments
+                        APPEND_ESTR(start, "  ; print space\n");
+                        APPEND_ESTR(start, "  mov rax, 1\n");
+                        APPEND_ESTR(start, "  mov rdi, 1\n");
+                        APPEND_ESTR(start, "  lea rsi, [rel space_char]\n");
+                        APPEND_ESTR(start, "  mov rdx, 1\n");
+                        APPEND_ESTR(start, "  syscall\n");
+                    }
+                    APPEND_ESTR(start, "  ; print int\n");
+                    APPEND_ESTR(start, "  mov rax, ");
+                    APPEND_ESTR(start, processValueString(gi.args.args[j], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
+                    APPEND_ESTR(start, "\n");
+                    APPEND_ESTR(start, "  call print_int\n");
+                }
+                
+                if (gi.type == PRINTLN) {
+                    APPEND_ESTR(start, "  ; print newline\n");
+                    APPEND_ESTR(start, "  mov rax, 1\n");
+                    APPEND_ESTR(start, "  mov rdi, 1\n");
+                    APPEND_ESTR(start, "  lea rsi, [rel newline_char]\n");
+                    APPEND_ESTR(start, "  mov rdx, 1\n");
+                    APPEND_ESTR(start, "  syscall\n");
+                }
+                break;
+            }
             case END: {
                 if (gi.args.length < 1) {
                     runtimeError(TOO_FEW_ARGS, "Expecting 1 arg for end instruction", &gi, i);
@@ -216,11 +895,15 @@ char* compileGroundProgram(GroundProgram* program) {
                 APPEND_ESTR(start, "  ; end\n");
                 APPEND_ESTR(start, "  mov rax, 60\n");
                 APPEND_ESTR(start, "  mov rdi, ");
-                APPEND_ESTR(start, processValueString(gi.args.args[0]));
+                APPEND_ESTR(start, processValueString(gi.args.args[0], &varTable, NULL, &doubleTable, &rodata, &doubleConstCounter));
                 APPEND_ESTR(start, "\n");
                 APPEND_ESTR(start, "  syscall\n");
                 break;
             }
+            case DROP: {
+                // Drop does nothing in ground->asm as we use the stack
+                break;
+            }
             default: {
                 printf("no\n");
                 exit(1);
@@ -231,7 +914,9 @@ char* compileGroundProgram(GroundProgram* program) {
     Estr complete = CREATE_ESTR("");
     APPEND_ESTR(complete, start.str);
     APPEND_ESTR(complete, "  ; End of program\n  mov rax, 60\n  mov rdi, 0\n  syscall\n");
-    APPEND_ESTR(complete, data.str)
+    APPEND_ESTR(complete, helpers.str);
+    APPEND_ESTR(complete, data.str);
+    APPEND_ESTR(complete, rodata.str);
 
     return complete.str;
 }

src/compiler.h

@@ -7,6 +7,7 @@ char* compileGroundProgram(GroundProgram* program);
 typedef struct VariableInfo {
     char name[256];
     int offset;
+    GroundValueType type;
 } VariableInfo;
 
 typedef struct VariableTable {
@@ -15,4 +16,13 @@ typedef struct VariableTable {
     size_t capacity;
 } VariableTable;
 
+typedef struct DoubleConstant {
+    double value;
+    char label[64];
+} DoubleConstant;
 
+typedef struct DoubleTable {
+    DoubleConstant* constants;
+    size_t count;
+    size_t capacity;
+} DoubleTable;

src/interface.c

@@ -1,5 +1,6 @@
 #include "parser.h"
 #include "interpreter.h"
+#include "compiler.h"
 #include "types.h"
 
 #include <stdlib.h>
@@ -123,3 +124,7 @@ void groundAddValueToScope(GroundScope* gs, const char* name, GroundValue value)
 void groundAddFieldToStruct(GroundStruct* gstruct, char* name, GroundValue field) {
     addFieldToStruct(gstruct, name, field);
 }
+
+char* groundCompileProgram(GroundProgram* program) {
+    return compileGroundProgram(program);
+}

src/interpreter.c

@@ -2028,6 +2028,77 @@ GroundValue interpretGroundInstruction(GroundInstruction inst, GroundScope* scop
             break;
         }
 
+        /*
+         * OBJECTS
+         * Allows manipulation of Ground objects.
+         */
+        // getfield $obj &field &result
+        case GETFIELD: {
+            if (in->args.length < 3) {
+                runtimeError(TOO_FEW_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.length > 3) {
+                runtimeError(TOO_MANY_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.args[0].type != VALUE) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting an Object for arg 1", in, currentInstruction);
+            }
+            if (in->args.args[0].value.value.type != CUSTOM) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting an Object for arg 1", in, currentInstruction);
+            }
+            if (in->args.args[1].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 2", in, currentInstruction);
+            }
+            if (in->args.args[2].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", in, currentInstruction);
+            }
+
+            GroundObjectField* field = findField(*in->args.args[0].value.value.data.customVal, in->args.args[1].value.refName);
+            if (field == NULL) {
+                runtimeError(UNKNOWN_VARIABLE, "Struct does not contain that field", in, currentInstruction);
+            }
+            addVariable(scope->variables, in->args.args[2].value.refName, field->value);
+            
+            break;
+        }
+        // setfield &obj &field $value
+        case SETFIELD: {
+            if (in->args.length < 3) {
+                runtimeError(TOO_FEW_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.length > 3) {
+                runtimeError(TOO_MANY_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.args[0].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef to an Object for arg 1", in, currentInstruction);
+            }
+            if (in->args.args[1].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 2", in, currentInstruction);
+            }
+            if (in->args.args[2].type != VALUE) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a Value for arg 3", in, currentInstruction);
+            }
+
+            GroundVariable* var = findVariable(*scope->variables, in->args.args[0].value.refName);
+            if (var == NULL) {
+                runtimeError(UNKNOWN_VARIABLE, "Could not find that object", in, currentInstruction);
+            }
+            if (var->value.type != CUSTOM) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef to an Object for arg 1", in, currentInstruction);
+            }
+
+            GroundObjectField* field = findField(*var->value.data.customVal, in->args.args[1].value.refName);
+            if (field == NULL) {
+                runtimeError(UNKNOWN_VARIABLE, "Struct does not contain that field", in, currentInstruction);
+            }
+            if (field->value.type != in->args.args[2].value.value.type) {
+                runtimeError(ARG_TYPE_MISMATCH, "Field type and provided type do not match", in, currentInstruction);
+            }
+
+            field->value = copyGroundValue(&in->args.args[2].value.value);
+            break;
+        }
+
         case DROP: {
             if (in->args.length < 1) {
                 runtimeError(TOO_FEW_ARGS, "Expecting 1 arg", in, currentInstruction);

src/parser.c

@@ -168,6 +168,8 @@ static GroundInstType getInstructionType(const char* inst) {
     if (strcmp(inst, "struct") == 0) return STRUCT;
     if (strcmp(inst, "endstruct") == 0) return ENDSTRUCT;
     if (strcmp(inst, "init") == 0) return INIT;
+    if (strcmp(inst, "getfield") == 0) return GETFIELD;
+    if (strcmp(inst, "setfield") == 0) return SETFIELD;
     if (strcmp(inst, "use") == 0) return USE;
     if (strcmp(inst, "extern") == 0) return EXTERN;
     if (strcmp(inst, "drop") == 0) return DROP;

src/types.h

@@ -9,7 +9,7 @@
 #include "include/uthash.h"
 
 typedef enum GroundInstType {
-    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
+    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, GETFIELD, SETFIELD, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
 } GroundInstType;
 
 typedef enum GroundValueType {
@@ -63,7 +63,7 @@ typedef struct GroundError {
 typedef struct GroundValue {
     GroundValueType type;
     struct GroundStruct* customType;
-    union {
+    struct {
         int64_t intVal;
         double doubleVal;
         char* stringVal;

tests/struct.grnd

@@ -0,0 +1,17 @@
+struct -point
+
+    init &x -int
+    init &y -int
+
+endstruct
+
+init &mypoint -point
+
+setfield &mypoint &x 53
+setfield &mypoint &y 32
+
+getfield $mypoint &x &value
+println $value
+
+getfield $mypoint &y &value
+println $value