From d07aa27c361c424e1da383ae49e98e5dfb33425e Mon Sep 17 00:00:00 2001
From: pacien
Date: Tue, 5 Jun 2018 22:16:36 +0200
Subject: handle decl. of read-only vars

---
 src/generator.c    |  4 ++--
 src/symbol_table.c | 28 ++++++++++++++++++++++------
 src/symbol_table.h |  4 ++++
 3 files changed, 28 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/generator.c b/src/generator.c
index 33fade9..0040c02 100644
--- a/src/generator.c
+++ b/src/generator.c
@@ -96,12 +96,12 @@ void gen_const_declaration() {
 void gen_const(const char name[], int value, Scope scope) {
   switch (scope) {
   case LOCAL:
-    loc_addVar(name, INT); // TODO: make read only
+    loc_addConst(name);
     fprintf(output, "push %d\n", value);
     return;
 
   case GLOBAL:
-    glo_addVar(name, INT); // TODO: make read only
+    glo_addConst(name);
     fprintf(output, "%s: db QWORD %d\n", name, value);
     return;
   }
diff --git a/src/symbol_table.c b/src/symbol_table.c
index 483de4c..08124ac 100644
--- a/src/symbol_table.c
+++ b/src/symbol_table.c
@@ -66,7 +66,7 @@ int fun_lookup(const char name[], int nb_param) {
   return -1;
 }
 
-void glo_addVar(const char name[], int type) {
+static void glo_add(const char name[], int type, bool read_only) {
   int count;
   for (count = 0; count < glo_symbol_table.size; count++) {
     if (!strcmp(glo_symbol_table.entries[count].name, name)) {
@@ -82,8 +82,16 @@ void glo_addVar(const char name[], int type) {
   }
   strcpy(glo_symbol_table.entries[glo_symbol_table.size - 1].name, name);
   glo_symbol_table.entries[glo_symbol_table.size - 1].type = type;
-  glo_symbol_table.entries[glo_symbol_table.size - 1].addr =
-      (glo_symbol_table.size - 1) * 8;
+  glo_symbol_table.entries[glo_symbol_table.size - 1].addr = (glo_symbol_table.size - 1) * 8;
+  glo_symbol_table.entries[glo_symbol_table.size - 1].read_only = read_only;
+}
+
+void glo_addVar(const char name[], int type) {
+  glo_add(name, type, false);
+}
+
+void glo_addConst(const char name[]) {
+  glo_add(name, INT, true);
 }
 
 // Verifies that the variable exists and returns the type
@@ -125,7 +133,7 @@ void glo_display_table() {
   fprintf(output, "\n");
 }
 
-void loc_addVar(const char name[], int type) {
+static void loc_add(const char name[], int type, bool read_only) {
   int count;
   for (count = 0; count < loc_symbol_table.size; count++) {
     if (!strcmp(loc_symbol_table.entries[count].name, name)) {
@@ -141,8 +149,16 @@ void loc_addVar(const char name[], int type) {
   }
   strcpy(loc_symbol_table.entries[loc_symbol_table.size - 1].name, name);
   loc_symbol_table.entries[loc_symbol_table.size - 1].type = type;
-  loc_symbol_table.entries[loc_symbol_table.size - 1].addr =
-      (loc_symbol_table.size - 1) * 8 + 8;
+  loc_symbol_table.entries[loc_symbol_table.size - 1].addr = (loc_symbol_table.size - 1) * 8 + 8;
+  loc_symbol_table.entries[loc_symbol_table.size - 1].read_only = read_only;
+}
+
+void loc_addVar(const char name[], int type) {
+  loc_add(name, type, false);
+}
+
+void loc_addConst(const char name[]) {
+  loc_add(name, INT, true);
 }
 
 int loc_lookup(const char name[]) {
diff --git a/src/symbol_table.h b/src/symbol_table.h
index d0ac440..b2c8879 100644
--- a/src/symbol_table.h
+++ b/src/symbol_table.h
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdbool.h>
 
 #define MAXNAME 32
 #define MAXSYMBOLS 256
@@ -24,6 +25,7 @@ typedef struct {
   char name[MAXNAME];
   int type;
   int addr;
+  bool read_only;
 } STentry;
 
 typedef struct {
@@ -48,10 +50,12 @@ void fun_add(const char name[], int rt_type, int nb_par);
 void fun_display_table();
 int fun_lookup(const char name[], int nb_param);
 void glo_addVar(const char name[], int type);
+void glo_addConst(const char name[]);
 int glo_lookup(const char name[]);
 int glo_get_addr(const char name[]);
 void glo_display_table();
 void loc_addVar(const char name[], int type);
+void loc_addConst(const char name[]);
 int loc_lookup(const char name[]);
 int loc_get_addr(const char name[]);
 void loc_display_table();
-- 
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