Implemented if statements and made putuint work with 0

flagpole/fvmstd.fp

@@ -8,16 +8,19 @@ endproc
 
 proc putuint
   @val
+  if &val 0 == then
+    48 :putchar return
+  endif
   1 @divisor
-
+  
   while &val &divisor u/ 9 u> do
     10 &divisor u* @divisor
   endwhile
-
+  
   while &divisor 0 u> do
     &val &divisor u/ 10 u%
     48 u+ :putchar
-
+  
     &divisor 10 u/ @divisor
   endwhile
 endproc

flagpole/src/main.c

@@ -68,10 +68,21 @@ bool SBeq(Lz_SB *sb, const char *cstr) {
   return !memcmp(sb->data, cstr, l);
 }
 
+void commentStack(void *stack) {
+  typedef Lz_DA(int) intstack;
+  intstack *s = stack;
+  printf("  ; Stack:");
+  lz_da_foreach(int, x, *s) {
+    printf(" %d", *x);
+  }
+  printf("\n");
+}
+
 static inline bool isKW(Lz_SB *sb) {
   return
        SBeq(sb, "proc")
     || SBeq(sb, "endproc")
+    || SBeq(sb, "return")
     || SBeq(sb, "ld8")
     || SBeq(sb, "st8")
     || SBeq(sb, "dup")
@@ -199,6 +210,7 @@ codegen:
     //printf("I must gen code i am now Amista Azozin\n");
     //fprintf(stderr,"Token type: %d\n", currTokenKind);
     //fprintf(stderr,"Tok: "LZ_STR_FMT"\n", LZ_STR_PRINTF(tokenAccumulator));
+    printf("  ; "LZ_STR_FMT"\n", LZ_STR_PRINTF(tokenAccumulator));
     switch (currTokenKind) {
       case TOKEN_KEYWORD: {
         if (SBeq(&tokenAccumulator, "proc")) {
@@ -208,9 +220,18 @@ codegen:
         if (SBeq(&tokenAccumulator, "endproc")) {
           printf("  Ret\n");
           printf("\n\n");
+          if (labelStack.cnt != 0) {
+            fprintf(stderr, 
+                "Unmatched statement in function %s\n", funcName);
+            exit(1);
+          }
           funcName[0] = 0;
           break;
         }
+        if (SBeq(&tokenAccumulator, "return")) {
+          printf("  Ret\n");
+          break;
+        }
         if (SBeq(&tokenAccumulator, "ld8")) {
           printf("  popstack 101\n");
           printf("  Ld8 102, 101\n");
@@ -238,6 +259,7 @@ codegen:
         }
         if (SBeq(&tokenAccumulator, "while")) {
           lz_da_append(labelStack, counter);
+          commentStack(&labelStack);
           printf("__whilehead_%d:\n", counter);
           break;
         }
@@ -251,24 +273,27 @@ codegen:
         }
         if (SBeq(&tokenAccumulator, "endwhile")) {
           int lbl = lz_da_pop(labelStack);
+          commentStack(&labelStack);
           printf("  Jmp __whilehead_%d\n", lbl);
           printf("__whiletail_%d:\n", lbl);
           break;
         }
         if (SBeq(&tokenAccumulator, "if")) {
           lz_da_append(labelStack, counter);
+          commentStack(&labelStack);
           break;
         }
         if (SBeq(&tokenAccumulator, "then")) {
-          int lbl = labelStack.data[labelStack.cnt-1];
-          //int lbl = lz_da_pop(labelStack);
-          //lz_da_append(labelStack, lbl);
+          commentStack(&labelStack);
+          int lbl = lz_da_pop(labelStack);
+          lz_da_append(labelStack, lbl);
           printf("  popstack 123\n");
           printf("  RSetF 123\n");
           printf("  JmpIE __iftail_%d\n", lbl);
           break;
         }
         if (SBeq(&tokenAccumulator, "endif")) {
+          commentStack(&labelStack);
           int lbl = lz_da_pop(labelStack);
           printf("__iftail_%d:\n", lbl);
           break;

flagpole/tests/ifs.fp

@@ -11,4 +11,3 @@ proc main
     "Alright, have a nice day" :puts :newline
   endif
 endproc
-

flagpole/tests/numbers.fp

@@ -2,5 +2,8 @@ $inc fvmstd.fp
 
 proc main
   "Hello World!" :puts :newline
-  23 :putuint
+  23  :putuint :newline
+  0   :putuint :newline
+  69  :putuint :newline
+  420 :putuint :newline
 endproc