add nilptrs, more conversion functions and change how ptrs work

Pointers now no longer point to the Value struct (the internal wrapper for
values) but to the value itself.

main.c

@@ -8,6 +8,7 @@
 #include "ir.h"
 #include "lex.h"
 #include "parse.h"
+#include "runtime.h"
 #include "util.h"
 #include "vm.h"
 
@@ -57,6 +58,7 @@ static Value fn_int(Value *args) {
 		case TypeFloat: ret.Int = (ssize_t)args[0].Float; break;
 		case TypeInt:   ret.Int = args[0].Int;            break;
 		case TypeBool:  ret.Int = (ssize_t)args[0].Bool;  break;
+		case TypeChar:  ret.Int = (ssize_t)args[0].Char;  break;
 		case TypeArr:
 			if (args[0].Arr.is_string && args[0].Arr.type == TypeChar) {
 				ssize_t endpos;
@@ -83,6 +85,7 @@ static Value fn_float(Value *args) {
 		case TypeFloat: ret.Float = args[0].Float;        break;
 		case TypeInt:   ret.Float = (double)args[0].Int;  break;
 		case TypeBool:  ret.Float = (double)args[0].Bool; break;
+		case TypeChar:  ret.Float = (double)args[0].Char; break;
 		case TypeArr:
 			if (args[0].Arr.is_string && args[0].Arr.type == TypeChar) {
 				ssize_t endpos;
@@ -99,6 +102,31 @@ static Value fn_float(Value *args) {
 	return ret;
 }
 
+static Value fn_bool(Value *args) {
+	return (Value){ .type = TypeBool, .Bool = is_nonzero(&args[0]) };
+}
+
+static Value fn_char(Value *args) {
+	Value ret = {
+		.type = TypeChar,
+		.Float = 0.0,
+	};
+	switch (args[0].type) {
+		case TypeVoid:  break;
+		case TypeFloat: ret.Char = (char)args[0].Float; break;
+		case TypeInt:   ret.Char = (char)args[0].Int;   break;
+		case TypeBool:  ret.Char = (char)args[0].Bool;  break;
+		case TypeChar:  ret.Char = args[0].Char;        break;
+		default: ASSERT_UNREACHED();
+	}
+	return ret;
+}
+
+static Value fn_ptr(Value *args) {
+	(void)args;
+	return (Value){ .type = TypePtr, .Ptr = { .type = TypeVoid, .val = NULL }};
+}
+
 static Value fn_pow(Value *args) {
 	if (!(args[0].type == TypeFloat && args[1].type == TypeFloat)) {
 		set_err("pow() requires arguments of type float");
@@ -209,6 +237,9 @@ int main(int argc, const char **argv) {
 		{ .name = "putln", .kind = FuncVarArgs,   .returns = false, .side_effects = true,  .VarArgs   = { .min_args = 0, .NoRet.func   = fn_putln, }},
 		{ .name = "int",   .kind = FuncFixedArgs, .returns = true,  .side_effects = false, .FixedArgs = { .n_args = 1,   .WithRet.func = fn_int,   }},
 		{ .name = "float", .kind = FuncFixedArgs, .returns = true,  .side_effects = false, .FixedArgs = { .n_args = 1,   .WithRet.func = fn_float, }},
+		{ .name = "bool",  .kind = FuncFixedArgs, .returns = true,  .side_effects = false, .FixedArgs = { .n_args = 1,   .WithRet.func = fn_bool,  }},
+		{ .name = "char",  .kind = FuncFixedArgs, .returns = true,  .side_effects = false, .FixedArgs = { .n_args = 1,   .WithRet.func = fn_char,  }},
+		{ .name = "ptr",   .kind = FuncFixedArgs, .returns = true,  .side_effects = false, .FixedArgs = { .n_args = 0,   .WithRet.func = fn_ptr,   }},
 		{ .name = "pow",   .kind = FuncFixedArgs, .returns = true,  .side_effects = false, .FixedArgs = { .n_args = 2,   .WithRet.func = fn_pow,   }},
 		{ .name = "sleep", .kind = FuncFixedArgs, .returns = false, .side_effects = true,  .FixedArgs = { .n_args = 1,   .NoRet.func   = fn_sleep, }},
 		{ .name = "getln", .kind = FuncFixedArgs, .returns = true,  .side_effects = true,  .FixedArgs = { .n_args = 0,   .WithRet.func = fn_getln, }},

runtime.c

@@ -133,6 +133,9 @@ bool is_nonzero(const Value *v) {
 		case TypeInt:   return v->Int     != 0;
 		case TypeFloat: return v->Float   != 0.0;
 		case TypeBool:  return v->Bool;
+		case TypeChar:  return v->Char    != 0;
+		case TypePtr:   return v->Ptr.val != NULL;
+		case TypeArr:   return v->Arr.len != 0;
 		default: ASSERT_UNREACHED();
 	}
 }

tok.c

@@ -11,6 +11,7 @@ size_t type_size[TypeEnumSize] = {
 	[TypeInt]   = sizeof(((Value*)NULL)->Int),
 	[TypeBool]  = sizeof(((Value*)NULL)->Bool),
 	[TypeChar]  = sizeof(((Value*)NULL)->Char),
+	[TypePtr]   = sizeof(((Value*)NULL)->Ptr),
 	[TypeArr]   = sizeof(((Value*)NULL)->Arr),
 };
 
@@ -47,11 +48,17 @@ void print_value(const Value *v, bool raw) {
 				else     printf("'%c'", v->Char);
 			}
 			break;
-		case TypePtr:
+		case TypePtr: {
+			if (v->Ptr.val) {
 				printf("ptr<%s>(", type_str[v->Ptr.type]);
-			print_value(v->Ptr.val, false);
+				Value deref = { .type = v->Ptr.type };
+				memcpy(&deref.Void, v->Ptr.val, type_size[v->Ptr.type]);
+				print_value(&deref, false);
 				printf(")");
+			} else
+				printf("ptr<%s>(nil)", type_str[v->Ptr.type]);
 			break;
+		}
 		case TypeArr:
 			if (v->Arr.is_string) {
 				if (v->Arr.type != TypeChar)

tok.h

@@ -31,7 +31,7 @@ typedef struct Value {
 		char Char;
 		struct {
 			Type type;
-			struct Value *val;
+			void *val;
 		} Ptr;
 		struct {
 			Type type;

vm.c

@@ -70,7 +70,7 @@ void run(const IRToks *ir, const BuiltinFunc *builtin_funcs) {
 					.type = TypePtr,
 					.Ptr = {
 						.type = v->type,
-						.val = v,
+						.val = &v->Void,
 					},
 				};
 				break;