From 37cd29c0299dc3a726c7f8273cf203a868133f57 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Wed, 17 Aug 2022 12:21:57 +0200
Subject: struct,union

---
 src/parse.cff | 122 ++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 89 insertions(+), 33 deletions(-)

(limited to 'src/parse.cff')

diff --git a/src/parse.cff b/src/parse.cff
index 13c89f5..34e7943 100644
--- a/src/parse.cff
+++ b/src/parse.cff
@@ -566,6 +566,8 @@ fn putdecl(P *Parser, eloc Loc, decl Decl) *Decl {
 // Types Parsing //
 ///////////////////
 
+fn parsetype(P *Parser) *const Type;
+
 fn parseagg(P *Parser, kind AggKind, name *const u8, retdecl **Decl) *const Type {
    let loc = P.tokloc;
    let tok Tok #?;
@@ -577,9 +579,10 @@ fn parseagg(P *Parser, kind AggKind, name *const u8, retdecl **Decl) *const Type
       }
    }
    let ty = decl ? decl.u.Ty : interntype({ .u: :Agg { kind, name, id++ }});
-   let agg = &(as(*Type)ty).u.Agg;
+   let ty = as(*Type)ty;
+   let agg = &ty.u.Agg;
 
-   if name != #null and lexmatch(P, &tok, ';') {
+   if name != #null {
       agg.fwd = #t;
       if decl == #null {
          decl = putdecl(P, loc, { name, loc, .u: :Ty(ty)});
@@ -587,11 +590,34 @@ fn parseagg(P *Parser, kind AggKind, name *const u8, retdecl **Decl) *const Type
             *retdecl = decl;
          }
       }
-      return ty;
-   } else {
+   }
+   if !lexmatch(P, &tok, ';') {
       agg.fwd = #f;
-            
+      lexexpect(P, '{');
+      let size = 0, align = 1;
+      let flds Vec<AggField> = {};
+      while !lexmatch(P, #null, '}') {
+         let off = size;
+         let name = lexexpect(P, :ident).u.ident;
+         let type = parsetype(P);
+         if type {
+            off = ALIGNUP(off, type.align);
+            align = MAX(align, type.align);
+            size = kind == :Struct ? off + type.size
+                                   : MAX(size, type.size);
+         }
+         flds->push({ name, type, off });
+
+         if !lexmatch(P, #null, ',') {
+            lexexpect(P, '}');
+            break;
+         }
+      }
+      ty.size = size;
+      ty.align = align; 
+      agg.flds = flds.dat[0::flds.len];
    }
+   return ty;
 }
 
 fn xident2type(P *Parser, eloc Loc, name *const u8) *const Type {
@@ -605,15 +631,68 @@ fn xident2type(P *Parser, eloc Loc, name *const u8) *const Type {
    return decl.u.Ty;
 }
 
+fn parsefnparams(P *Parser, variadic *bool, paramnames *Vec<*const u8>, paramtys *Vec<*const Type>) void {
+   lexexpect(P, '(');
+   let tok Tok #?;
+   *variadic = #t;
+   while !lexmatch(P, &tok, ')') {
+      if lexmatch(P, #null, '...') {
+         *variadic = #t;
+         lexmatch(P, #null, ',');
+         lexexpect(P, ')');
+         break;
+      }
+      let name *const u8 = #null;
+      let type *const Type #?;
+      if lexmatch(P, &tok, :ident) {
+         let tok2 Tok #?;
+         if (tok2 = lexpeek(P)).t == ',' or tok2.t == ')' {
+            type = xident2type(P, tok.loc, tok.u.ident);
+         } else {
+            name = tok.u.ident;
+            type = parsetype(P);
+         }
+      } else {
+         type = parsetype(P);
+      }
+      if paramnames {
+         paramnames->push(name);
+      }
+      paramtys->push(type);
+      if !lexmatch(P, &tok, ',') {
+         lexexpect(P, ')');
+         break;
+      }
+   }
+}
+
+fn parsefntype(P *Parser) *const Type {
+   let variadic = #f;
+   let paramtys Vec<*const Type> = {};
+   parsefnparams(P, &variadic, #null, &paramtys);
+   let ret = parsetype(P);
+   return interntype({ .u: :Fn {
+      paramtys->move(P.alloc),
+      variadic,
+      ret,
+   }});
+}
+
 fn parsetype(P *Parser) *const Type {
    let tok Tok = {};
    switch {
    case lexmatch(P, &tok, :kw_const);
       return constify(parsetype(P));
+
    case lexmatch(P, &tok, '*');
       return mkptrtype(parsetype(P));
+
    case lexmatch(P, &tok, :ident);
       return xident2type(P, tok.loc, tok.u.ident);
+
+   case lexmatch(P, &tok, :kw_fn);
+      return parsefntype(P);
+
    case else;
       fatal(P, tok.loc, "expected type (near %qT)", tok);
    }
@@ -1252,34 +1331,7 @@ fn parsefn(P *Parser, externp bool, name *const u8) *Decl {
        paramnames Vec<*const u8> = {},
        paramtys Vec<*const Type> = {};
 
-   lexexpect(P, '(');
-   while !lexmatch(P, &tok, ')') {
-      if lexmatch(P, #null, '...') {
-         Fn.variadic = #t;
-         lexmatch(P, #null, ',');
-         lexexpect(P, ')');
-         break;
-      }
-      let name *const u8 = #null;
-      let type *const Type #?;
-      if lexmatch(P, &tok, :ident) {
-         let tok2 Tok #?;
-         if (tok2 = lexpeek(P)).t == ',' or tok2.t == ')' {
-            type = xident2type(P, tok.loc, tok.u.ident);
-         } else {
-            name = tok.u.ident;
-            type = parsetype(P);
-         }
-      } else {
-         type = parsetype(P);
-      }
-      paramnames->push(name);
-      paramtys->push(type);
-      if !lexmatch(P, &tok, ',') {
-         lexexpect(P, ')');
-         break;
-      }
-   }
+   parsefnparams(P, &Fn.variadic, &paramnames, &paramtys);
    Fn.paramnames = paramnames->move(P.alloc);
    let retty = parsetype(P);
    Fn.ty = interntype({ .size: 0, .align: 1, .u: :Fn {
@@ -1393,6 +1445,10 @@ fn parsedecls(P *Parser, yield DeclYielder, yarg *void, toplevel bool) void {
       let name = lexexpect(P, :ident).u.ident;
       parseagg(P, :Struct, name, &decl);
 
+   case lexmatch(P, &tok, :kw_union);
+      let name = lexexpect(P, :ident).u.ident;
+      parseagg(P, :Union, name, &decl);
+
    case lexmatch(P, &tok, :kw_static);
       struct Arg {
          P *Parser,
-- 
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