From 69487ed29aed49ca0e3481e9783e02e9156258b2 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Fri, 22 May 2020 17:14:48 -0700
Subject: fix: encapsulated the IO stack into the lexer

---
 sys/cmd/cc/cc.h | 123 ++++++++++++++++++++++++++++----------------------------
 1 file changed, 61 insertions(+), 62 deletions(-)

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

diff --git a/sys/cmd/cc/cc.h b/sys/cmd/cc/cc.h
index 0d4c876..62837c4 100644
--- a/sys/cmd/cc/cc.h
+++ b/sys/cmd/cc/cc.h
@@ -263,17 +263,46 @@ Sym  *lookup(SymTab *tab, string ident);
 error forget(SymTab *tab, string ident);
 void  forgetall(SymTab *tab);
 
+enum
+{
+    IOnil  = iota(0),
+    IOfile = iota(1),
+    IObuff = iota(2),
+};
+
+struct Io
+{
+    io·Buffer  rdr;
+    string     path;
+    uint32     kind;
+    union {
+        Stream  *f;
+        byte    *b;
+    };
+
+    Pos        store;
+    struct Io *link;
+};
+
 struct Lexer
 {
     Pos     pos;
-    Io     *io;
-    SymTab sym;
+    SymTab  sym;
     byte   *b;
     byte    buf[2*1024];
 
     /* predefined dynamic macros */
     uintptr macfile;
     uintptr macline;
+
+    /* i/o data */
+    Io     *io, *new;
+    Io      iostk[100];
+    struct {
+        int      cap;
+        int      len;
+        string  *path;
+    } omit;
 };
 
 /* lex.c functions */
@@ -285,8 +314,11 @@ rune  getrune(Lexer *);
 byte  ungetbyte(Lexer *);
 rune  ungetrune(Lexer *, rune r);
 
-void  pushio(Lexer *lx, Io *new);
-void  popio(Lexer *lx);
+Io*  openio(Lexer *lx, byte *path);
+Io*  makeio(Lexer *lx, byte *name);
+void freeio(Lexer *lx, Io *io);
+void pushio(Lexer *lx, Io *new);
+void popio(Lexer *lx);
 
 void puttok(Token);
 
@@ -524,6 +556,7 @@ enum
     Sbad    = -1,
 };
 
+/* intermediate nodes */
 struct Ptr
 {
     uint64  kind;
@@ -551,29 +584,22 @@ struct Dtor
 
 struct Decls
 {
-    union {
-        struct Dtor;
-        Dtor   dtor;
-    };
+    Type  *type;
     Expr  *init;
     struct Decls *link;
 };
 
+/* final ast node */
 struct Decl
 {
     struct Node;
-    uint64 spec;
+    uint32 spec;
+    string name;
+    Type  *type;
     union {
-        struct {
-            struct Dtor;
-            Stmt  *body;
-        } func;
-        struct {
-            struct Dtor;
-            Expr  *init;
-            struct Decls *link;
-        } var;
-        struct Dtor type;
+        Stmt *func;
+        Expr *init;
+        struct Decls *link;
     };
 };
 
@@ -627,42 +653,23 @@ struct Parser
         Decl  **decls;
     } ast;
 
+    /* static buffers */
     Scope *sp;
     Scope  spstk[20];
+
+    Name  *nm;
+    Name   nmstk[40];
+
+    Dtor  *dt;
+    Dtor   dtstk[40];
 };
 
 /* ast.c functions */
-void parse(Parser *, Lexer *);
+error parse(Parser *, Lexer *);
 
 // -----------------------------------------------------------------------
 // global compiler
 
-enum
-{
-    IOnil  = iota(0),
-    IOfile = iota(1),
-    IObuff = iota(2),
-};
-
-struct Io
-{
-    io·Buffer  rdr;
-    string     path;
-    uint32     kind;
-    union {
-        Stream  *f;
-        byte    *b;
-    };
-
-    Pos        store;
-    struct Io *link;
-};
-
-/* cc.c io functions */
-Io*  openio(byte *path);
-Io*  makeio(byte *name);
-void freeio(Io *io);
-
 struct StrTab
 {
   int32  n_buckets;
@@ -687,35 +694,27 @@ struct Compiler
     string     outfile;
 
     struct {
-        int   cap;
-        int   len;
-        Type *info;
-    } type;
+        int     cap;
+        int     len;
+        string *val;
+    } def;
 
-    /* i/o data */
     struct {
         int     cap;
         int     len;
         string *dir;
     } inc;
 
-    Io     *io;
-    Io      iostk[100];
     struct {
-        int      cap;
-        int      len;
-        string  *path;
-    } omit;
-
-    /* partitioned data for stages */
-    Lexer  lxr;
-    Parser psr;
+        int   cap;
+        int   len;
+        Type *info;
+    } type;
 }; 
 
 extern Compiler C;
 
 /* cc.c compiler functions */
-void pushomit(string omit);
 void init();
 
 #undef iota
-- 
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