From 50d3df1fafd26305742373a71022fdc4dd0d0ed4 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Fri, 22 May 2020 16:28:55 -0700
Subject: checkin: going to rework declaration structure to be more transparent

---
 sys/cmd/cc/cc.h | 143 ++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 98 insertions(+), 45 deletions(-)

(limited to 'sys/cmd/cc/cc.h')

diff --git a/sys/cmd/cc/cc.h b/sys/cmd/cc/cc.h
index 1412302..0d4c876 100644
--- a/sys/cmd/cc/cc.h
+++ b/sys/cmd/cc/cc.h
@@ -207,19 +207,22 @@ enum
 extern byte *tokens[NUM_TOKENS];
 
 /* TODO: store literals in a big val */
+union Val
+{
+    byte  *s;
+    double f;
+    vlong  i;
+    uvlong ui;
+    int32  c;
+    uint32 uc;
+    rune   r;
+};
+
 struct Token
 {
-    uint32 kind;
-    Pos    pos;
-    union {
-        byte  *s;
-        double f;
-        vlong  i;
-        uvlong ui;
-        int32  c;
-        uint32 uc;
-        rune   r;
-    } val;
+    uint32    kind;
+    Pos       pos;
+    union Val val;
 };
 
 enum
@@ -321,10 +324,10 @@ enum
     /* conditional */
     Xternary,
     /* unary prefix ops  */
-    Xref, Xstar, Xplus, Xminus, Xneg, Xnot, Xsizeof, Xalnof, Xpreinc, Xpredec, 
+    Xref, Xstar, Xplus, Xminus, Xneg, Xnot, Xsizeof, Xalignof, Xpreinc, Xpredec, 
     Xcast, 
     /* unary postfix ops */
-    Xpostinc, Xpostdec, Xindex, Xcall, Xsel, Xcmpndlit, 
+    Xpostinc, Xpostdec, Xindex, Xcall, Xselp, Xself, Xcmpdlit, 
     /* binary ops */
     Xoror, Xandand, Xor, Xxor, Xand, Xneq, Xeql, Xgt, Xlt, Xgteq, Xlteq, Xlsft, Xrsft, 
     Xadd, Xsub, Xmul, Xdiv, Xmod,
@@ -347,11 +350,35 @@ enum
 };
 
 /* expressions */
+struct Key
+{
+    /* 
+     * NOTE: bitpacked 
+     *       lower 32 -> index into designator array
+     *       upper 32 -> type
+     */ 
+    uint64 kind;
+    union {
+        Expr  *x;
+        string s;
+    };
+};
+
 struct Expr
 {
-    struct Node;
-    uint64 type;
+    struct  Node;
+    Type   *type;
     union {
+        struct {
+            uint64 kind;
+            union  Val;
+        } val;
+        struct {
+            int           n;
+            struct Key *key;
+            Expr       *val;
+        } cmpd;
+        Expr *x;
         struct {
             Expr *l;
             Expr *r;
@@ -361,13 +388,25 @@ struct Expr
             Expr *t;
             Expr *e;
         } cond;
+        struct {
+            Expr *x;
+            union {
+                Expr  *i;
+                string f;
+            };
+        } idx;
+        struct {
+            Expr *fn;
+            int  n;
+            Expr **arg;
+        } call;
         union {
             Expr *pre;
             Expr *post;
         } unary; 
         struct {
-            uint64 to;
-            Expr   *x;
+            Type *to;
+            Expr *x;
         } cast;
         struct {
             Expr *l;
@@ -417,33 +456,8 @@ struct Stmt
 
 /* declarations */
 
-struct Ptr
-{
-    uint64  kind;
-    Ptr    *link;
-};
-
-struct Name 
-{
-    struct Node;
-    union {
-        string       ident;
-        struct Dtor *paren;
-    };
-    union {
-        Expr *i;
-        Expr *p;
-    };
-};
-
-struct Dtor
-{
-    Ptr   ptr;
-    Name  name;
-};
-
-// specifiers
 /* 
+ * specifiers
  * the design is the following:
  * type info is held w/in a 64 bit integer.
  * the bottom 32 bits are associated to specializations 
@@ -510,6 +524,31 @@ enum
     Sbad    = -1,
 };
 
+struct Ptr
+{
+    uint64  kind;
+    Ptr    *link;
+};
+
+struct Name 
+{
+    struct Node;
+    union {
+        string       ident;
+        struct Dtor *paren;
+    };
+    union {
+        Expr *i;
+        Expr *p;
+    };
+};
+
+struct Dtor
+{
+    Ptr   ptr;
+    Name  name;
+};
+
 struct Decls
 {
     union {
@@ -538,24 +577,38 @@ struct Decl
     };
 };
 
+enum
+{
+    Tbad,
+    Tbase,
+    Tarray,
+    Tptr,
+};
+
 /* types */
 struct Type
 {
     Sym     *sym;
     string  ident;
+    uint64  kind;
     uintptr size;
     uint16  align;
     union {
+        Type *ptr;
+        struct {
+            int   len;
+            Type *elt;
+        } arr;
         struct {
             int    len;
             Dtor   *d;
             Expr   *x;
-        } su;
+        } agr;
         struct {
             int    len;
             string *s;
             Expr   *x;
-        } en;
+        } enm;
     };
 };
 
-- 
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