Added support for functions and dynamic contexts. Improved work with constant pool

VaninVM/CodeHeader.h

@@ -0,0 +1,39 @@
+#ifndef CODE_HEADER
+#define CODE_HEADER
+#pragma pack(push, 1)
+struct 
+{
+	char signature[4];
+	int version;
+	int count_const;
+	int size_const;
+}First_Header;
+
+struct
+{
+	short id_start;
+	int count_code;
+}ByteCodeH_Common;
+
+struct
+{
+	int size_func;
+	int size_bytecode;
+	int size_signature;
+}ByteCodeH_Signat;
+
+struct
+{
+	short id;
+	int count_locals;
+	int count_args;
+}ByteCodeH_Primary;
+
+typedef struct
+{
+	int count_locals;
+	int count_args;
+	char* code;
+} func;
+#endif
+#pragma pop

VaninVM/Context.c

@@ -0,0 +1,33 @@
+#include "Context.h"
+#include <malloc.h>
+context* create_context(int function, func** hash, char** code)
+{
+	context* cont;
+	cont = (context*)malloc(sizeof(context));
+
+	cont->id = function;
+	cont->locals=malloc(8*hash[function]->count_locals);
+	*(code)=hash[function]->code;
+	return cont;
+}
+
+void remove_context(context* cont)
+{
+	free(cont->locals);
+	free(cont);
+}
+
+void push_context(context* cont)
+{
+	c_node* node;
+	node = (c_node*)malloc(sizeof(c_node));
+	node->obj=cont;
+	node->prev = node_last;
+	node_last = node;
+}
+context* pop_context()
+{
+	c_node* last = node_last;
+	node_last = node_last->prev;
+	return last->obj;
+}

VaninVM/Context.h

@@ -0,0 +1,27 @@
+#ifndef CONTEXT_H
+#define CONTEXT_H
+
+#include "CodeHeader.h"
+#include <stdio.h>
+
+
+typedef struct
+{
+	int id;
+	void* locals;
+} context;
+
+typedef struct NODE
+{
+	context* obj;
+	struct NODE* prev;
+} c_node;
+
+c_node* node_last;
+
+context* create_context(int function, func** hash,char** code);
+void push_context(context*);
+context* pop_context();
+void remove_context(context*);
+
+#endif

VaninVM/IOcode.c

@@ -1,12 +1,37 @@
 #include "IOcode.h"
 #include "CodeHeader.h"
+#include <string.h>
 
-char* read_bytecode(FILE* stream)
+int read_bytecode(FILE* stream, func*** hash)
 {
-	char* buffer = (char*)calloc(1, 1000); //Early version without bytecode file
-	fread_s(buffer, 1000, sizeof(char), 1000, stream); //Early version without bytecode file
+	int i;
+	char* name;
+	char* code;
+	func* function;
+
+	*(hash) = (func**)malloc(sizeof(func*)*65536);
+	fread_s(&ByteCodeH_Common, sizeof(ByteCodeH_Common), sizeof(ByteCodeH_Common), 1, stream);
+
+	for (i=0; i<ByteCodeH_Common.count_code; i++)
+	{
+		function = (func*)malloc(sizeof(func));
+
+		fread(&ByteCodeH_Signat, sizeof(ByteCodeH_Signat), 1, stream);
+		name = (char*)malloc(ByteCodeH_Signat.size_signature);
+		fread(name, ByteCodeH_Signat.size_signature, 1, stream);
+		free(name);
+
+		fread(&ByteCodeH_Primary, sizeof(ByteCodeH_Primary), 1, stream);
+		code = (char*)malloc(ByteCodeH_Signat.size_bytecode);
+		fread(code, ByteCodeH_Signat.size_bytecode, 1, stream);
+
+		function->code=code;
+		function->count_args=ByteCodeH_Primary.count_args;
+		function->count_locals=ByteCodeH_Primary.count_locals;
+		(*(hash))[ByteCodeH_Primary.id]=function;
+	}
+	return ByteCodeH_Common.id_start;
 
-	return buffer;
 }
 
 int read_constant(FILE* stream, int* count, char*** index)
@@ -17,24 +42,22 @@ int read_constant(FILE* stream, int* count, char*** index)
 	fread_s(&First_Header, sizeof(First_Header), sizeof(First_Header), 1, stream); //Reading first part of header
 	*(count) = First_Header.count_const;
 
-	buffer = (char*)malloc(First_Header.size_const);
-	*(index) = (char**)malloc(sizeof(char**)*2);
+	buffer = (char*)malloc(First_Header.size_const+1);
+	buffer[0]=0;
+	*(index) = (char**)malloc(sizeof(char**)*First_Header.count_const);
 
 
-	fread_s(buffer, First_Header.size_const, sizeof(char), First_Header.size_const, stream); //Reading constant values
+	fread_s(buffer+1, First_Header.size_const, sizeof(char), First_Header.size_const, stream); //Reading constant values
 
 	j=0;
-	if (First_Header.count_const>0)
+	(*(index))[j++]=buffer;
+	for (i = 0; i<First_Header.size_const+1; i++)
 	{
-		(*(index))[j++] = buffer;
-		for (i = 0; i<First_Header.size_const; i++)
-		{
-			if (j==First_Header.count_const)
-				break;
+		if (j==First_Header.count_const)
+			break;
 
-			if (buffer[i] == 0)
-				(*(index))[j++]=&buffer[i+1];
-		}
+		if (buffer[i] == 0)
+			(*(index))[j++]=&buffer[i+1];
 	}
 	return 0;
 }

VaninVM/IOcode.h

@@ -1,9 +1,10 @@
 #ifndef IOCODE_H
 #define IOCODE_H
 
+#include "CodeHeader.h"
 #include <malloc.h>
 #include <stdio.h>
 
-char* read_bytecode(FILE*);
+int read_bytecode(FILE*, func***);
 int read_constant(FILE*, int*, char***);
 #endif

VaninVM/Main.c

@@ -2,6 +2,8 @@
 #include "TOS.h"
 #include "OpCode.h"
 #include "CodeHeader.h"
+#include "Context.h"
+#include "ReturnStack.h"
 
 
 
@@ -15,29 +17,33 @@ int main(int argc, char** argv)
 	long long i1, i2;
 	short s1;
 	char* code;	
-	int ip;
+	int ip, startfunc;
 
 	//ConstSection Variables
 	int const_count;
 	char** const_index;
 
-	//Execution Variable
+	//CodeSection Variables
+	func** phash_table;
+	context* current_context;
+
+	//Running Variable
 	int exec_status = 1;
 
 	fopen_s(&input, "bytecode", "rb");
-
 	//const_pull
 	read_constant(input, &const_count, &const_index);
-	
-	code=read_bytecode(input);
-
+	//code_pull
+	startfunc = read_bytecode(input, &phash_table);
 	fclose(input);
 	
 
 	initTOS();
-
+	initRStack();
 	ip = 0;
 
+	current_context = create_context(startfunc, phash_table, &code);
+
 	while (exec_status)
 	{
 		switch (code[ip])
@@ -54,11 +60,11 @@ int main(int argc, char** argv)
 				//DO(ILOAD, "Load int on TOS, inlined into insn stream.", 9)
 				i1 = *((long long*)(code+(++ip)));
 				push_int(i1);
-				ip++; break;
+				ip+=8; break;
 			case SLOAD:
 				s1 = *((short*)(code+(++ip)));
 				push_int((long long)(const_index[s1]));
-				ip++; break;
+				ip+=2; break;
 			case DLOAD0:
 				// DO(DLOAD0, "Load double 0 on TOS.", 1)
 				push_double(0);
@@ -173,18 +179,16 @@ int main(int argc, char** argv)
 			case IPRINT:
 				//DO(IPRINT, "Pop and print integer TOS.", 1)
 				i1 = pop_int();
-				push_int(i1);
 				printf("%d", i1);
 				ip++; break;
 			case DPRINT:
 				//DO(DPRINT, "Pop and print double TOS.", 1)
 				d1 = pop_double();
-				push_double(d1);
 				printf("%f", d1);
 				ip++; break;
 			case SPRINT:
+				//DO(SPRINT, "Pop and print string TOS.", 1)
 				i1 = pop_int();
-				push_int(i1);
 				printf("%s", (char*)i1);
 				ip++; break;
 			case I2D:
@@ -214,8 +218,21 @@ int main(int argc, char** argv)
 				//DO(STOP, "Stop execution.", 1)
 				exec_status = 0;				
 				break;
+			case CALL:
+				s1 = *((short*)(code+(++ip)));
+				ip+=2; push_ret(ip);
+				push_context(current_context);
+				current_context = create_context(s1, phash_table, &code);
+				ip = 0; break;
+			case RETURN:
+				remove_context(current_context);
+				current_context = pop_context();
+				code = phash_table[current_context->id]->code;
+				ip = pop_ret();	break;
+
 		}
 	}
+	remove_context(current_context);
 	getchar();
 	return 0;
 }

VaninVM/OpCode.h

@@ -33,6 +33,8 @@ enum opcode
 	D2I,
 	SWAP,
 	POP,
-	STOP
+	STOP,
+	CALL,
+	RETURN
 };
 #endif

VaninVM/ReturnStack.c

@@ -0,0 +1,20 @@
+#include <malloc.h>
+#include "ReturnStack.h"
+
+void push_ret(int num)
+{
+	RStack[rp++] = num;
+}
+
+int pop_ret()
+{
+	int num = RStack[--rp];
+	return num;
+}
+
+int initRStack()
+{
+	RStack = (int*)calloc(1, 1000);
+	rp = 0;
+	return 0;
+}

VaninVM/ReturnStack.h

@@ -0,0 +1,9 @@
+#ifndef RETURNSTACK_H
+#define RETURNSTACK_H
+
+int* RStack;
+int rp;
+int initRStack();
+void push_ret(int);
+int pop_ret();
+#endif