Now handling return values from main.

Changed to more strict handling of main() - if it's not defined in main-calling mode then the program will crash rather than ignoring the problem.
Tests changed to correspond to this approach.


git-svn-id: http://picoc.googlecode.com/svn/trunk@479 21eae674-98b7-11dd-bd71-f92a316d2d60

picoc.c

@@ -1,7 +1,9 @@
 #include "picoc.h"
 
-#define CALL_MAIN_NO_ARGS "main();"
-#define CALL_MAIN_WITH_ARGS "main(__argc,__argv);"
+#define CALL_MAIN_NO_ARGS_RETURN_VOID "main();"
+#define CALL_MAIN_WITH_ARGS_RETURN_VOID "main(__argc,__argv);"
+#define CALL_MAIN_NO_ARGS_RETURN_INT "__exit_value = main();"
+#define CALL_MAIN_WITH_ARGS_RETURN_INT "__exit_value = main(__argc,__argv);"
 
 /* initialise everything */
 void Initialise(int StackSize)
@@ -41,21 +43,34 @@ void CallMain(int argc, char **argv)
     struct Value *FuncValue = NULL;
 
     if (!VariableDefined(TableStrRegister("main")))
-        return;
+        ProgramFail(NULL, "main() is not defined");
         
     VariableGet(NULL, TableStrRegister("main"), &FuncValue);
     if (FuncValue->Typ->Base != TypeFunction)
         ProgramFail(NULL, "main is not a function - can't call it");
 
-    if (FuncValue->Val->FuncDef.NumParams == 0)
-        Parse("", CALL_MAIN_NO_ARGS, strlen(CALL_MAIN_NO_ARGS), TRUE);
-    else
+    if (FuncValue->Val->FuncDef.NumParams != 0)
     {
         /* define the arguments */
         VariableDefinePlatformVar(NULL, "__argc", &IntType, (union AnyValue *)&argc, FALSE);
         VariableDefinePlatformVar(NULL, "__argv", CharPtrPtrType, (union AnyValue *)&argv, FALSE);
+    }
 
-        Parse("", CALL_MAIN_WITH_ARGS, strlen(CALL_MAIN_WITH_ARGS), TRUE);
+    if (FuncValue->Val->FuncDef.ReturnType == &VoidType)
+    {
+        if (FuncValue->Val->FuncDef.NumParams == 0)
+            Parse("", CALL_MAIN_NO_ARGS_RETURN_VOID, strlen(CALL_MAIN_NO_ARGS_RETURN_VOID), TRUE);
+        else
+            Parse("", CALL_MAIN_WITH_ARGS_RETURN_VOID, strlen(CALL_MAIN_WITH_ARGS_RETURN_VOID), TRUE);
+    }
+    else
+    {
+        VariableDefinePlatformVar(NULL, "__exit_value", &IntType, (union AnyValue *)&ExitValue, TRUE);
+    
+        if (FuncValue->Val->FuncDef.NumParams == 0)
+            Parse("", CALL_MAIN_NO_ARGS_RETURN_INT, strlen(CALL_MAIN_NO_ARGS_RETURN_INT), TRUE);
+        else
+            Parse("", CALL_MAIN_WITH_ARGS_RETURN_INT, strlen(CALL_MAIN_WITH_ARGS_RETURN_INT), TRUE);
     }
 }
 
@@ -103,7 +118,7 @@ int main(int argc, char **argv)
     }
     
     Cleanup();
-    return 0;
+    return ExitValue;
 }
 #else
 # ifdef SURVEYOR_HOST
@@ -131,7 +146,7 @@ int picoc(char *SourceStr)
         Parse("test.c", SourceStr, strlen(SourceStr), TRUE);
     ParseInteractive();
     Cleanup();
-    return 0;
+    return ExitValue;
 }
 # endif
 #endif

tests/00_assignment.c

@@ -10,3 +10,4 @@ printf("%d\n", b);
 int c = 12, d = 34;
 printf("%d, %d\n", c, d);
 
+void main() {}

tests/01_comment.c

@@ -5,3 +5,6 @@ printf("Hello\n"); /* this is a comment */ printf("Hello\n");
 printf("Hello\n");
 // this is also a comment sayhello();
 printf("Hello\n");
+
+
+void main() {}

tests/02_printf.c

@@ -9,3 +9,5 @@ for (Count = -5; Count <= 5; Count++)
 printf("String 'hello', 'there' is '%s', '%s'\n", "hello", "there");
 printf("Character 'A' is '%c'\n", 65);
 printf("Character 'a' is '%c'\n", 'a');
+
+void main() {}

tests/03_struct.c

@@ -13,3 +13,5 @@ bloggs.natasha = 34;
 
 printf("%d\n", bloggs.boris);
 printf("%d\n", bloggs.natasha);
+
+void main() {}

tests/04_for.c

@@ -6,3 +6,5 @@ for (Count = 1; Count <= 10; Count++)
 {
     printf("%d\n", Count);
 }
+
+void main() {}

tests/05_array.c

@@ -12,3 +12,5 @@ for (Count = 0; Count < 10; Count++)
 {
     printf("%d\n", Array[Count]);
 }
+
+void main() {}

tests/06_case.c

@@ -20,3 +20,5 @@ for (Count = 0; Count < 4; Count++)
             break;
     }
 }
+
+void main() {}

tests/07_function.c

@@ -21,3 +21,5 @@ void qfunc()
 }
 
 qfunc();
+
+void main() {}

tests/08_while.c

@@ -15,3 +15,5 @@ while (a < 100)
     a = t + p;
     p = t;
 }
+
+void main() {}

tests/09_do_while.c

@@ -16,3 +16,5 @@ do
     p = t;
 } while (a < 100);
 
+
+void main() {}

tests/10_pointer.c

@@ -33,3 +33,5 @@ printf("tsar->c = %d\n", tsar->c);
 b = &(bolshevic.b);
 printf("bolshevic.b = %d\n", *b);
 */
+
+void main() {}

tests/11_precedence.c

@@ -33,3 +33,5 @@ printf("%d\n", a != b && c != d);
 printf("%d\n", a + b * c / f);
 printf("%d\n", a + b * c / f);
 
+
+void main() {}

tests/12_hashdefine.c

@@ -6,3 +6,5 @@
 printf("%d\n", FRED);
 printf("%d, %d, %d\n", BLOGGS(1), BLOGGS(2), BLOGGS(3));
 
+
+void main() {}

tests/13_integer_literals.c

@@ -12,3 +12,5 @@ printf("%d\n", c);
 printf("%d\n", d);
 printf("%d\n", e);
 
+
+void main() {}

tests/14_if.c

@@ -13,3 +13,5 @@ if (b)
 else
     printf("b is false\n");
 
+
+void main() {}

tests/15_recursion.c

@@ -12,3 +12,5 @@ int Count;
 
 for (Count = 1; Count <= 10; Count++)
     printf("%d\n", factorial(Count));
+
+void main() {}

tests/16_nesting.c

@@ -12,3 +12,5 @@ for (x = 0; x < 2; x++)
         }
     }
 }
+
+void main() {}

tests/17_enum.c

@@ -20,3 +20,5 @@ frod = 12;
 printf("%d\n", frod);
 frod = e;
 printf("%d\n", frod);
+
+void main() {}

tests/18_include.c

@@ -3,3 +3,5 @@
 printf("including\n");
 #include "18_include.h"
 printf("done\n");
+
+void main() {}

tests/19_pointer_arithmetic.c

@@ -20,3 +20,5 @@ if (c == NULL)
 else
     printf("c is not NULL\n");
 
+
+void main() {}

tests/20_pointer_comparison.c

@@ -16,3 +16,5 @@ d = e;
 printf("%d\n", d == e);
 printf("%d\n", d != e);
 
+
+void main() {}

tests/21_char_array.c

@@ -25,3 +25,5 @@ while (*src != 0)
 
 printf("copied string is %s\n", destarray);
 
+
+void main() {}

tests/22_floating_point.c

@@ -41,3 +41,5 @@ printf("%f\n", -12.34);
 a = 2;
 printf("%f\n", a);
 printf("%f\n", sin(2));
+
+void main() {}

tests/23_type_coercion.c

@@ -45,3 +45,5 @@ float f = 'a';
 float g = 97;
 
 printf("%f %f\n", f, g);
+
+void main() {}

tests/24_math_library.c

@@ -19,3 +19,5 @@ printf("%f\n", sqrt(0.12));
 printf("%f\n", round(12.34));
 printf("%f\n", ceil(12.34));
 printf("%f\n", floor(12.34));
+
+void main() {}

tests/26_character_constants.c

@@ -9,3 +9,5 @@ printf("%d\n", '\x10');
 printf("%d\n", '\x40');
 printf("test \x407\n");
 
+
+void main() {}

tests/27_sizeof.c

@@ -8,3 +8,5 @@ printf("%d\n", sizeof(a));
 printf("%d\n", sizeof(b));
 printf("%d\n", sizeof(c));
 
+
+void main() {}

tests/28_strings.c

@@ -37,3 +37,5 @@ printf("%d\n", memcmp(a, "apple", 4) > 0);
 printf("%d\n", memcmp(a, "grgr", 4) == 0);
 printf("%d\n", memcmp(a, "zebra", 4) < 0);
 
+
+void main() {}

tests/29_array_address.c

@@ -4,3 +4,5 @@
 char a[10];
 strcpy(a, "abcdef");
 printf("%s\n", &a[1]);
+
+void main() {}

tests/33_ternary_op.c

@@ -6,3 +6,5 @@ for (Count = 0; Count < 10; Count++)
 {
     printf("%d\n", (Count < 5) ? (Count*Count) : (Count * 3));
 }
+
+void main() {}

tests/34_array_assignment.c

@@ -14,3 +14,5 @@ int b[4];
 b = a;
 
 printf("%d %d %d %d\n", b[0], b[1], b[2], b[3]);
+
+void main() {}

tests/35_sizeof.c

@@ -5,3 +5,5 @@ short b;
 
 printf("%d %d\n", sizeof(char), sizeof(a));
 printf("%d %d\n", sizeof(short), sizeof(b));
+
+void main() {}

tests/36_array_initialisers.c

@@ -12,3 +12,5 @@ int Array2[10] = { 12, 34, 56, 78, 90, 123, 456, 789, 8642, 9753, };
 for (Count = 0; Count < 10; Count++)
     printf("%d: %d\n", Count, Array2[Count]);
 
+
+void main() {}

tests/37_sprintf.c

@@ -8,3 +8,5 @@ for (Count = 1; Count <= 20; Count++)
     sprintf(Buf, "->%02d<-\n", Count);
     printf("%s", Buf);
 }
+
+void main() {}

tests/38_multiple_array_index.c

@@ -25,3 +25,5 @@ for (x = 0; x < 4; x++)
     }
     printf("\n");
 }
+
+void main() {}

tests/39_typedef.c

@@ -22,3 +22,5 @@ typedef MyFunStruct *MoreFunThanEver;
 
 MoreFunThanEver c = &b;
 printf("%d,%d\n", c->i, c->j);
+
+void main() {}

tests/40_stdio.c

@@ -43,3 +43,5 @@ while (fgets(freddy, sizeof(freddy), f) != NULL)
     printf("x: %s", freddy);
 
 fclose(f);
+
+void main() {}

tests/41_hashif.c

@@ -76,3 +76,5 @@ printf("#include test\n");
   printf("t\n");
  #endif
 #endif
+
+void main() {}

tests/43_void_param.c

@@ -6,3 +6,5 @@ void fred(void)
 }
 
 fred();
+
+void main() {}

tests/44_scoped_declarations.c

@@ -8,3 +8,5 @@ for (a = 0; a < 2; a++)
 }
 
 printf("it's all good\n");
+
+void main() {}