[hackers] [scc] [cc1] Add support for defined in cpp || Roberto E. Vargas Caballero

[git]

commit b93fb91a6000311ebf202fa2d618e1f9e2158bbd
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Tue Sep 27 15:27:47 2016 +0200
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Tue Sep 27 15:27:47 2016 +0200

    [cc1] Add support for defined in cpp

diff --git a/cc1/expr.c b/cc1/expr.c
index c4ebc09..1a75299 100644
--- a/cc1/expr.c
+++ b/cc1/expr.c
@@ -838,8 +838,10 @@ static Node *
 unary(int needdecay)
 {
        Node *(*fun)(char, Node *), *np;
+       Symbol *sym;
        char op;
        Type *tp;
+       int paren;
 
        switch (yytoken) {
        case '!': op = 0;     fun = negation;     break;
@@ -860,7 +862,26 @@ unary(int needdecay)
                next();
                np = incdec(unary(1), op);
                goto chk_decay;
+       case IDEN:
+       case TYPEIDEN:
+               if (lexmode != CPPMODE || strcmp(yylval.sym->name, "defined"))
+                       goto call_postfix;
+               disexpand = 1;
+               next();
+               paren = accept('(');
+               if (yytoken != IDEN && yytoken != TYPEIDEN)
+                       cpperror("operator 'defined' requires an identifier");
+               if (yytoken == TYPEIDEN || !(yylval.sym->flags & SDECLARED))
+                       sym = zero;
+               else
+                       sym = one;
+               disexpand = 0;
+               next();
+               if (paren)
+                       expect(')');
+               return constnode(sym);
        default:
+       call_postfix:
                np = postfix(primary());
                goto chk_decay;
        }
diff --git a/cc1/tests/test066.c b/cc1/tests/test066.c
new file mode 100644
index 0000000..386871f
--- /dev/null
+++ b/cc1/tests/test066.c
@@ -0,0 +1,55 @@
+/* See LICENSE file for copyright and license details. */
+
+/*
+name: TEST066
+description: Test cpp defined operator
+error:
+test066.c:53: error: operator 'defined' requires an identifier
+test066.c:53: error: expected ')' before '<EOF>'
+output:
+G1     I       "x      (
+       #I0
+)
+G3     I       F       "main
+{
+\
+       h       #I0
+*/
+
+
+#if defined X
+X
+#endif
+
+#if defined(X)
+X
+#endif
+
+#if X
+X
+#endif
+
+#define X 0
+
+#if X
+X
+#endif
+
+#if defined(X)
+int x = 0;
+#endif
+
+#undef X
+#define X 1
+
+#if X
+int
+main()
+{
+       return 0;
+}
+#endif
+
+#if defined (1)
+#error 1 is defined
+#endif