Neg instruction

quazi-irfan · May 5, 2017 · 6249176 · 6249176
1 parent 33373c2
commit 6249176
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Showing 2 changed files with 30 additions and 3 deletions.
diff --git a/TACx86Pkg/x86Templates.java b/TACx86Pkg/x86Templates.java
@@ -143,4 +143,25 @@ public static String writeInteger(String var1){
 
         return writeIntegerTemplate;
     }
+
+    public static String negTemplate(String var1, String var2) {
+        String negTemplate = "";
+        if(var2.charAt(0) == '@'){
+            negTemplate = negTemplate.concat("\t\tmov bx,").concat(var2.substring(1, var2.length())).concat("\n");
+            negTemplate = negTemplate.concat("\t\tmov ax, [bx]").concat("\n");
+            negTemplate = negTemplate.concat("\t\tneg ax").concat(var2).concat("\n");
+        } else {
+            negTemplate = negTemplate.concat("\t\tmov ax, ").concat(var2.substring(1, var2.length())).concat("\n");
+            negTemplate = negTemplate.concat("\t\tneg ax").concat("\n");
+        }
+
+        if(var1.charAt(0) == '@'){
+            negTemplate = negTemplate.concat("\t\tmov bx, ").concat(var1.substring(1, var1.length())).concat("\n");
+            negTemplate = negTemplate.concat("\t\tmov [bx], ax");
+        } else {
+            negTemplate = negTemplate.concat("\t\tmov ").concat(var1).concat(", ax").concat("\n");
+        }
+
+        return negTemplate;
+    }
 }
diff --git a/TACx86Pkg/x86Translator.java b/TACx86Pkg/x86Translator.java
@@ -123,18 +123,22 @@ else if(statement.length() > 38){
                 if(operator.equals("+")){
                     asmWriter.println(x86Templates.additionTemplate(var1,var2,var3));
                 } else if(operator.equals("-")){
-
+                    //todo subtraction
                 } else if(operator.equals("*")){
                     asmWriter.println(x86Templates.multiplicationTemplate(var1,var2,var3));
                 } else if(operator.equals("/")){
-
+                    // todo division
                 }
 
                 continue;
             }
 
             // Assignment statement #2 : x = op y
-            else if(statement.length() > 22 && (statement.charAt(16) == '-' || statement.charAt(16) == '+')){
+            else if(statement.length() > 22 && (statement.charAt(16) == '-')){
+                String var1 = fixBP(firstToken);
+                tokenizer.nextToken();
+                String var2 = fixBP(tokenizer.nextToken());
+                asmWriter.println(x86Templates.negTemplate(var1, var2));
 
                 continue;
             }
@@ -151,6 +155,8 @@ else if(statement.length() > 22 && (statement.charAt(16) == '-' || statement.cha
             }
         } while (statement != null);
 
+        isSuccessfullyTranslated = true;
+
         asmWriter.close();
     }