102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
//Defining a symbol table
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//Using a Linked List Structure. Head of linked List points to parent scope (if one exists)
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//Tail of Linked List points to a Linked List of all the child scopes
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//T
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//*#include "symbol_table.h"
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/*
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct ListOfTable{
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struct SymbolTable* table;
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//struct ListOfTable* prev;
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struct ListOfTable* next;
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}ListOfTable;
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typedef union Value{
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int* value_of_int;
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void* value_of_pointer;
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bool* value_of_bool;
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char* value_of_char;
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}Value;
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typedef struct TableNode{
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char* theType;
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char* theName;
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Value* value;
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struct TableNode* next;
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//this next value is an int for string types to tell you how far to traverse a buffer for the string
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int StrLength;
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}TableNode;
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typedef struct SymbolTable{
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TableNode* entries;
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struct SymbolTable* Parent_Scope;
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struct ListOfTable* Children_Scope;
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int Line_Number;
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int Column_Number;
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}SymbolTable;
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*/
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SymbolTable* CreateScope(SymbolTable* ParentScope, int Line, int Column){
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SymbolTable* table = (SymbolTable*)malloc(sizeof(SymbolTable));
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table->Line_Number = Line;
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table->Column_Number = Column;
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table->Parent_Scope = ParentScope;
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table->Children_Scope = NULL;
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table->entries = NULL;
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if(ParentScope != NULL){
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if(ParentScope->Children_Scope == NULL){
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ListOfTable* newEntry = (ListOfTable*)malloc(sizeof(ListOfTable));
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newEntry->next = NULL;
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//newEntry->prev = NULL;
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newEntry->table = table;
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ParentScope->Children_Scope = newEntry;
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} else{
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ListOfTable* newEntry = (ListOfTable*)malloc(sizeof(ListOfTable));
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//newEntry->prev = NULL;
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newEntry->table= table;
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ListOfTable* oldEntry = ParentScope->Children_Scope;
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ParentScope->Children_Scope = newEntry;
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newEntry->next = oldEntry;
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}
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}
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return table;
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}
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TableNode* CreateEntry(SymbolTable* table, char* typeOf, char* id, Value* value, int StringLength){
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TableNode* newEntry = (TableNode*)malloc(sizeof(TableNode));
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newEntry->theType = typeOf;
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newEntry->theName = id;
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newEntry->value = value;
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newEntry->StrLength = StringLength;
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if(table->entries == NULL){
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table->entries = newEntry;
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return newEntry;
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} else{
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TableNode* oldEntry = table->entries;
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table->entries = newEntry;
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newEntry->next = oldEntry;
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return newEntry;
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}
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}
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//uncomment the below main function along with the headers above for a simple standalone test of table and entry creation
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/*
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int main(){
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char* String = "STRING";
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char* X = "X";
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Value* ofX = (Value*)malloc(sizeof(Value));
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ofX->value_of_char = X;
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SymbolTable* Second = CreateScope(NULL, 2,2);
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printf("Line number is %d, Column number of scope is %d\n",Second->Line_Number,Second->Column_Number);
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TableNode* First_Entry = CreateEntry(Second,String,X,ofX,-1);
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printf("The value of the first entry is %s\n",First_Entry->value->value_of_char);
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return 0;
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}
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*/
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