Started working on Toy_Scope, incomplete

I only worked for a couple hours today.

source/toy_opcodes.h

@@ -3,8 +3,6 @@
 typedef enum Toy_OpcodeType {
 	//variable instructions
 	TOY_OPCODE_READ,
-	TOY_OPCODE_LOAD,
-	TOY_OPCODE_LOAD_LONG, //corner case
 	TOY_OPCODE_DECLARE,
 	TOY_OPCODE_ASSIGN,
 	TOY_OPCODE_ACCESS,
@@ -18,7 +16,7 @@ typedef enum Toy_OpcodeType {
 
 	//comparison instructions
 	TOY_OPCODE_COMPARE_EQUAL,
-	// TOY_OPCODE_COMPARE_NOT,
+	// TOY_OPCODE_COMPARE_NOT, //NOTE: optimized into a composite of TOY_OPCODE_COMPARE_EQUAL + TOY_OPCODE_NEGATE
 	TOY_OPCODE_COMPARE_LESS,
 	TOY_OPCODE_COMPARE_LESS_EQUAL,
 	TOY_OPCODE_COMPARE_GREATER,

source/toy_scope.c.txt

@@ -0,0 +1,149 @@
+#include "toy_scope.h"
+#include "toy_console_colors.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "toy_print.h"
+
+//utils
+static void incrementRefCount(Toy_Scope* scope) {
+	for (Toy_Scope* iter = scope; iter; iter = iter->next) {
+		iter->refCount++;
+	}
+}
+
+static void decrementRefCount(Toy_Scope* scope) {
+	for (Toy_Scope* iter = scope; iter; iter = iter->next) {	
+		iter->refCount--;
+	}
+}
+
+static Toy_Value* lookupScope(Toy_Scope* scope, Toy_Value key, unsigned int hash, bool recursive) {
+	//terminate
+	if (scope == NULL) {
+		return NULL;
+	}
+
+	//copy and modify the code from Toy_lookupTable, so it can behave slightly differently
+	unsigned int probe = hash % scope->table->capacity;
+
+	while (true) {
+		//found the entry
+		if (TOY_VALUES_ARE_EQUAL(scope->table->data[probe].key, key)) {
+			return &(scope->table->data[probe].value);
+		}
+
+		//if its an empty slot
+		if (TOY_VALUE_IS_NULL(scope->table->data[probe].key)) {
+			return recursive ? lookupScope(scope->next, key, hash, recursive) : NULL;
+		}
+
+		//adjust and continue
+		probe = (probe + 1) % scope->table->capacity;
+	}
+}
+
+//exposed functions
+Toy_Scope* Toy_pushScope(Toy_Bucket** bucketHandle, Toy_Scope* scope) {
+	Toy_Scope* newScope = Toy_partitionBucket(bucketHandle, sizeof(Toy_Scope));
+
+	newScope->next = scope;
+	newScope->table = Toy_allocateTable();
+	newScope->refCount = 0;
+
+	incrementRefCount(newScope);
+
+	return newScope;
+}
+
+Toy_Scope* Toy_popScope(Toy_Scope* scope) {
+	decrementRefCount(scope);
+
+	if (scope->refCount == 0) {
+		Toy_freeTable(scope->table);
+		scope->table = NULL;
+	}
+
+	return scope->next;
+}
+
+Toy_Scope* deepCopyScope(Toy_Bucket** bucketHandle, Toy_Scope* scope) {
+	Toy_Scope* newScope = Toy_pushScope(bucketHandle, scope->next);
+
+	//forcibly copy the contents
+	for (int i = 0; i < scope->table->capacity; i++) {
+		if (!TOY_VALUE_IS_NULL(scope->table->data[i].key)) {
+			Toy_insertTable(&newScope->table, scope->table->data[i].key, scope->table->data[i].value);
+		}
+	}
+
+	return newScope;
+}
+
+void Toy_declareScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key, Toy_Value value) {
+	if (key.type != TOY_STRING_NAME) {
+		fprintf(stderr, TOY_CC_ERROR "ERROR: Toy_Scope only allows name strings as keys\n" TOY_CC_RESET);
+		exit(-1);
+	}
+
+	Toy_Value* valuePtr = lookupScope(scope, key, Toy_hashValue(key), false);
+
+	if (valuePtr != NULL) {
+
+		char buffer[key.length + 256];
+		snprintf(buffer, "Can't redefine a variable: %s", key.as.name.data);
+		Toy_error(buffer);
+		return;
+	}
+
+	Toy_insertTable(&scope->table, key, value);
+}
+
+void Toy_assignScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key, Toy_Value value) {
+	if (key.type != TOY_STRING_NAME) {
+		fprintf(stderr, TOY_CC_ERROR "ERROR: Toy_Scope only allows name strings as keys\n" TOY_CC_RESET);
+		exit(-1);
+	}
+
+	Toy_Value* valuePtr = lookupScope(scope, key, Toy_hashValue(key), true);
+
+	if (valuePtr == NULL) {
+		char buffer[key.length + 256];
+		snprintf(buffer, "Undefined variable: %s", key.as.name.data);
+		Toy_error(buffer);
+		return;
+	}
+
+	*valuePtr = value;
+}
+
+Toy_Value Toy_accessScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key) {
+	if (key.type != TOY_STRING_NAME) {
+		fprintf(stderr, TOY_CC_ERROR "ERROR: Toy_Scope only allows name strings as keys\n" TOY_CC_RESET);
+		exit(-1);
+	}
+
+	Toy_Value* valuePtr = lookupScope(scope, key, Toy_hashValue(key), true);
+
+	if (valuePtr == NULL) {
+		char buffer[key.length + 256];
+		snprintf(buffer, "Undefined variable: %s", key.as.name.data);
+		Toy_error(buffer);
+		return;
+	}
+
+	return *valuePtr;
+}
+
+bool Toy_isDeclaredScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key) {
+	if (key.type != TOY_STRING_NAME) {
+		fprintf(stderr, TOY_CC_ERROR "ERROR: Toy_Scope only allows name strings as keys\n" TOY_CC_RESET);
+		exit(-1);
+	}
+
+	Toy_Value* valuePtr = lookupScope(scope, key, Toy_hashValue(key), true);
+
+	return valuePtr != NULL;
+}

source/toy_scope.h.txt

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "toy_common.h"
+
+#include "toy_bucket.h"
+#include "toy_value.h"
+#include "toy_string.h"
+#include "toy_table.h"
+
+//wraps Toy_Table, restricting keys to name strings, and handles scopes as a linked list
+typedef struct Toy_Scope {
+	struct Toy_Scope* next;
+	Toy_Table* table;
+	unsigned int refCount;
+} Toy_Scope;
+
+//handle deep scopes
+TOY_API Toy_Scope* Toy_pushScope(Toy_Bucket** bucketHandle, Toy_Scope* scope);
+TOY_API Toy_Scope* Toy_popScope(Toy_Scope* scope);
+
+TOY_API Toy_Scope* deepCopyScope(Toy_Bucket** bucketHandle, Toy_Scope* scope);
+
+//manage the contents
+TOY_API void Toy_declareScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key, Toy_Value value);
+TOY_API void Toy_assignScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key, Toy_Value value);
+TOY_API Toy_Value Toy_accessScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key);
+
+TOY_API bool Toy_isDeclaredScope(Toy_Bucket** bucketHandle, Toy_Scope* scope, Toy_String key);

source/toy_string.c

@@ -34,6 +34,17 @@ static void decrementRefCount(Toy_String* str) {
 	}
 }
 
+static unsigned int hashCString(const char* string) {
+	unsigned int hash = 2166136261u;
+
+	for (unsigned int i = 0; string[i]; i++) {
+		hash *= string[i];
+		hash ^= 16777619;
+	}
+
+	return hash;
+}
+
 //exposed functions
 Toy_String* Toy_createString(Toy_Bucket** bucketHandle, const char* cstring) {
 	int length = strlen(cstring);
@@ -59,7 +70,7 @@ Toy_String* Toy_createStringLength(Toy_Bucket** bucketHandle, const char* cstrin
 	return ret;
 }
 
-TOY_API Toy_String* Toy_createNameString(Toy_Bucket** bucketHandle, const char* cname) {
+TOY_API Toy_String* Toy_createNameString(Toy_Bucket** bucketHandle, const char* cname, Toy_ValueType type) {
 	int length = strlen(cname);
 
 	if (length > TOY_STRING_MAX_LENGTH) {
@@ -75,6 +86,7 @@ TOY_API Toy_String* Toy_createNameString(Toy_Bucket** bucketHandle, const char*
 	ret->cachedHash = 0; //don't calc until needed
 	memcpy(ret->as.name.data, cname, length + 1);
 	ret->as.name.data[length] = '\0';
+	ret->as.name.type = type;
 
 	return ret;
 }
@@ -271,3 +283,23 @@ int Toy_compareStrings(Toy_String* left, Toy_String* right) {
 
 	return deepCompareUtil(left, right, &leftHead, &rightHead);
 }
+
+unsigned int Toy_hashString(Toy_String* str) {
+	if (str->cachedHash != 0) {
+		return str->cachedHash;
+	}
+	else if (str->type == TOY_STRING_NODE) {
+		//TODO: I wonder if it would be possible to discretely swap the composite node string with a new leaf string here? Would that speed up other parts of the code by not having to walk the tree in future?
+		char* buffer = Toy_getStringRawBuffer(str);
+		str->cachedHash = hashCString(buffer);
+		free(buffer);
+	}
+	else if (str->type == TOY_STRING_LEAF) {
+		str->cachedHash = hashCString(str->as.leaf.data);
+	}
+	else if (str->type == TOY_STRING_NAME) {
+		str->cachedHash = hashCString(str->as.name.data);
+	}
+
+	return str->cachedHash;
+}

source/toy_string.h

@@ -41,7 +41,7 @@ typedef struct Toy_String {             //32 | 64 BITNESS
 TOY_API Toy_String* Toy_createString(Toy_Bucket** bucketHandle, const char* cstring);
 TOY_API Toy_String* Toy_createStringLength(Toy_Bucket** bucketHandle, const char* cstring, int length);
 
-TOY_API Toy_String* Toy_createNameString(Toy_Bucket** bucketHandle, const char* cname); //for variable names
+TOY_API Toy_String* Toy_createNameString(Toy_Bucket** bucketHandle, const char* cname, Toy_ValueType type); //for variable names
 
 TOY_API Toy_String* Toy_copyString(Toy_Bucket** bucketHandle, Toy_String* str);
 TOY_API Toy_String* Toy_deepCopyString(Toy_Bucket** bucketHandle, Toy_String* str);
@@ -57,3 +57,4 @@ TOY_API char* Toy_getStringRawBuffer(Toy_String* str); //allocates the buffer on
 
 TOY_API int Toy_compareStrings(Toy_String* left, Toy_String* right); //return value mimics strcmp()
 
+TOY_API unsigned int Toy_hashString(Toy_String* string);

source/toy_value.c

@@ -70,18 +70,7 @@ bool Toy_private_isEqual(Toy_Value left, Toy_Value right) {
 	return 0;
 }
 
-//hash utils
-static unsigned int hashCString(const char* string) {
-	unsigned int hash = 2166136261u;
-
-	for (unsigned int i = 0; string[i]; i++) {
-		hash *= string[i];
-		hash ^= 16777619;
-	}
-
-	return hash;
-}
-
+//hash util
 static unsigned int hashUInt(unsigned int x) {
     x = ((x >> 16) ^ x) * 0x45d9f3b;
     x = ((x >> 16) ^ x) * 0x45d9f3b;
@@ -89,7 +78,6 @@ static unsigned int hashUInt(unsigned int x) {
     return x;
 }
 
-
 unsigned int Toy_hashValue(Toy_Value value) {
 	switch(value.type) {
 		case TOY_VALUE_NULL:
@@ -104,27 +92,8 @@ unsigned int Toy_hashValue(Toy_Value value) {
 		case TOY_VALUE_FLOAT:
 			return hashUInt( *((int*)(&TOY_VALUE_AS_FLOAT(value))) );
 
-		case TOY_VALUE_STRING: {
-			Toy_String* str = TOY_VALUE_AS_STRING(value);
-
-			if (str->cachedHash != 0) {
-				return str->cachedHash;
-			}
-			else if (str->type == TOY_STRING_NODE) {
-				//TODO: I wonder if it would be possible to discretely swap the composite node string with a new leaf string here? Would that speed up other parts of the code by not having to walk the tree in future?
-				char* buffer = Toy_getStringRawBuffer(str);
-				str->cachedHash = hashCString(buffer);
-				free(buffer);
-			}
-			else if (str->type == TOY_STRING_LEAF) {
-				str->cachedHash = hashCString(str->as.leaf.data);
-			}
-			else if (str->type == TOY_STRING_NAME) {
-				str->cachedHash = hashCString(str->as.name.data);
-			}
-
-			return str->cachedHash;
-		}
+		case TOY_VALUE_STRING:
+			return Toy_hashString(TOY_VALUE_AS_STRING(value));
 
 		case TOY_VALUE_ARRAY:
 		case TOY_VALUE_DICTIONARY:

source/toy_vm.c

@@ -371,8 +371,6 @@ static void process(Toy_VM* vm) {
 				break;
 
 			//not yet implemented
-			case TOY_OPCODE_LOAD:
-			case TOY_OPCODE_LOAD_LONG:
 			case TOY_OPCODE_DECLARE:
 			case TOY_OPCODE_ASSIGN:
 			case TOY_OPCODE_ACCESS: