Attribute work

git-svn-id: svn://svn.cc65.org/cc65/trunk@1201 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/src/cc65/declattr.c b/src/cc65/declattr.c
index beeb8a76b81ed4af7f3e6dbf587c444e9456b5a0..3ac3e147974fb15987bb56fd0da81be94d694819 100644 (file)
--- a/src/cc65/declattr.c
+++ b/src/cc65/declattr.c
@@ -1,15 +1,15 @@
 /*****************************************************************************/
 /*                                                                           */
-/*                               declattr.c                                 */
+/*                               declattr.c                                 */
 /*                                                                           */
 /*                         Declaration attributes                           */
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2000     Ullrich von Bassewitz                                        */
-/*              Wacholderweg 14                                              */
-/*              D-70597 Stuttgart                                            */
-/* EMail:       uz@musoftware.de                                             */
+/* (C) 2000-2002 Ullrich von Bassewitz                                       */
+/*               Wacholderweg 14                                             */
+/*               D-70597 Stuttgart                                           */
+/* EMail:        uz@musoftware.de                                            */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -50,9 +50,23 @@
 
 
 
-/* Attribute names */
-static const char* const AttrNames [atCount] = {
-    "alias",
+/* Forwards for attribute handlers */
+static void AliasAttr (const Declaration* D, DeclAttr* A);
+static void UnusedAttr (const Declaration* D, DeclAttr* A);
+static void ZeroPageAttr (const Declaration* D, DeclAttr* A);
+
+
+
+/* Attribute table */
+typedef struct AttrDesc AttrDesc;
+struct AttrDesc {
+    const char Name[12];
+    void       (*Handler) (const Declaration*, DeclAttr*);
+};
+static const AttrDesc AttrTable [atCount] = {
+    { "alias",         AliasAttr       },
+    { "unused",                UnusedAttr      },
+    { "zeropage",              ZeroPageAttr    },
 };
 
 
@@ -63,28 +77,28 @@ static const char* const AttrNames [atCount] = {
 
 
 
-static attrib_t FindAttribute (const char* Attr)
-/* Search the attribute and return the corresponding attribute constant.
- * Return atNone if the attribute name is not known.
+static const AttrDesc* FindAttribute (const char* Attr)
+/* Search the attribute and return the corresponding attribute descriptor.
+ * Return NULL if the attribute name is not known.
  */
 {
-    int A;
+    unsigned A;
 
     /* For now do a linear search */
     for (A = 0; A < atCount; ++A) {
-       if (strcmp (Attr, AttrNames[A]) == 0) {
+               if (strcmp (Attr, AttrTable[A].Name) == 0) {
            /* Found */
-                   return (attrib_t) A;
+                   return AttrTable + A;
        }
     }
 
     /* Not found */
-    return atNone;
+    return 0;
 }
 
 
 
-static void AliasAttrib (const Declaration* D, DeclAttr* A)
+static void AliasAttr (const Declaration* D, DeclAttr* A)
 /* Handle the "alias" attribute */
 {
     SymEntry* Sym;
@@ -123,11 +137,29 @@ static void AliasAttrib (const Declaration* D, DeclAttr* A)
 
 
 
+static void UnusedAttr (const Declaration* D attribute ((unused)), DeclAttr* A)
+/* Handle the "unused" attribute */
+{
+    /* No parameters */
+    A->AttrType = atUnused;
+}
+
+
+
+static void ZeroPageAttr (const Declaration* D attribute ((unused)), DeclAttr* A)
+/* Handle the "zeropage" attribute */
+{
+    /* No parameters */
+    A->AttrType = atZeroPage;
+}
+
+
+
 void ParseAttribute (const Declaration* D, DeclAttr* A)
 /* Parse an additional __attribute__ modifier */
 {
-    ident    AttrName;
-    attrib_t AttrType;
+    ident          AttrName;
+    const AttrDesc* Attr;
 
     /* Initialize the attribute description with "no attribute" */
     A->AttrType = atNone;
@@ -154,25 +186,36 @@ void ParseAttribute (const Declaration* D, DeclAttr* A)
 
     /* Map the attribute name to its id, then skip the identifier */
     strcpy (AttrName, CurTok.Ident);
-    AttrType = FindAttribute (AttrName);
+    Attr = FindAttribute (AttrName);
     NextToken ();
 
-    /* Handle possible attributes */
-    switch (AttrType) {
+    /* Did we find a valid attribute? */
+    if (Attr) {
 
-       case atAlias:
-           AliasAttrib (D, A);
-           break;
+       /* Call the handler */
+       Attr->Handler (D, A);
 
-       default:
-           /* Attribute not known, maybe typo */
-           Error ("Illegal attribute: `%s'", AttrName);
-           break;
-    }
+       /* Read the two closing braces */
+       ConsumeRParen ();
+       ConsumeRParen ();
 
-    /* Read the two closing braces */
-    ConsumeRParen ();
-    ConsumeRParen ();
+    } else {
+       /* List of tokens to skip */
+       static const token_t SkipList[] = { TOK_LPAREN, TOK_SEMI };
+
+       /* Attribute not known, maybe typo */
+       Error ("Illegal attribute: `%s'", AttrName);
+
+       /* Skip until closing brace or semicolon */
+       SkipTokens (SkipList, sizeof (SkipList) / sizeof (SkipList[0]));
+
+       /* If we have a closing brace, read it, otherwise bail out */
+       if (CurTok.Tok == TOK_LPAREN) {
+           /* Read the two closing braces */
+           ConsumeRParen ();
+           ConsumeRParen ();
+       }
+    }
 }
 
 

diff --git a/src/cc65/declattr.h b/src/cc65/declattr.h
index 9975b40d114f978ddc7e72b76d00ae4c4a434862..cef08b30f5661e535871702c5dc04c8b4f215c54 100644 (file)
--- a/src/cc65/declattr.h
+++ b/src/cc65/declattr.h
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2000     Ullrich von Bassewitz                                        */
-/*              Wacholderweg 14                                              */
-/*              D-70597 Stuttgart                                            */
-/* EMail:       uz@musoftware.de                                             */
+/* (C) 2000-2002 Ullrich von Bassewitz                                       */
+/*               Wacholderweg 14                                             */
+/*               D-70597 Stuttgart                                           */
+/* EMail:        uz@musoftware.de                                            */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -52,6 +52,8 @@
 typedef enum {
     atNone     = -1,           /* No attribute */
     atAlias,                   /* Alias declaration */
+    atUnused,                  /* Variable is unused */
+    atZeroPage,                        /* Zero page symbol */
 
     atCount                    /* Number of attributes */
 } attrib_t;