Beginning of the symbol table implementation

1 files changed, 35 insertions, 0 deletions

diff --git a/src/symboltable.c b/src/symboltable.c
new file mode 100644
index 0000000..852d1b8
--- /dev/null
+++ b/src/symboltable.c
@@ -0,0 +1,35 @@
+#include "symboltable.h"
+
+extern int lineno; /* from lexical analyser */
+
+SymbolTable symbol_table = {{{{0},0}},MAXSYMBOLS,0};
+
+void addVar(const char name[], int type) {
+  int count;
+  for (count = 0; count < symbol_table.size; count++) {
+    if (!strcmp(symbol_table.entries[count].name, name)) {
+      printf("semantic error, redefinition of variable %s near line %d\n", name,
+             lineno);
+      return;
+    }
+  }
+  if (++symbol_table.size > symbol_table.maxsize) {
+    printf("too many variables near line %d\n", lineno);
+    exit(1);
+  }
+  strcpy(symbol_table.entries[symbol_table.size - 1].name, name);
+  symbol_table.entries[symbol_table.size - 1].type = type;
+}
+
+void lookup(const char name[]) {
+  int count;
+
+  for (count = 0; count < symbol_table.size; count++) {
+    if (!strcmp(symbol_table.entries[count].name, name)) {
+      return;
+    }
+    printf("No definition of the variable %s near line %d\n", name,
+           lineno);
+  }
+}
+