rustc: Remove compiler support for __log_level()

This commit removes all internal support for the previously used __log_level()
expression. The logging subsystem was previously modified to not rely on this
magical expression. This also removes the only other function to use the
module_data map in trans, decl_gc_metadata. It appears that this is an ancient
function from a GC only used long ago.

This does not remove the crate map entirely, as libgreen still uses it to hook
in to the event loop provided by libgreen.

6 files changed, 2 insertions, 18 deletions

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 3e600249a7d..4ef46573e23 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -529,9 +529,6 @@ pub enum Expr_ {
     ExprAgain(Option<Ident>),
     ExprRet(Option<@Expr>),
 
-    /// Gets the log level for the enclosing module
-    ExprLogLevel,
-
     ExprInlineAsm(InlineAsm),
 
     ExprMac(Mac),
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index b575cfaade6..997bfcc2e94 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -120,7 +120,7 @@ impl MacResult {
     pub fn raw_dummy_expr(sp: codemap::Span) -> @ast::Expr {
         @ast::Expr {
             id: ast::DUMMY_NODE_ID,
-            node: ast::ExprLogLevel,
+            node: ast::ExprTup(Vec::new()),
             span: sp
         }
     }
diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs
index 0b56cd07c88..8cc74641db8 100644
--- a/src/libsyntax/fold.rs
+++ b/src/libsyntax/fold.rs
@@ -816,7 +816,6 @@ pub fn noop_fold_expr<T: Folder>(e: @Expr, folder: &mut T) -> @Expr {
             ExprIndex(folder.fold_expr(el), folder.fold_expr(er))
         }
         ExprPath(ref pth) => ExprPath(folder.fold_path(pth)),
-        ExprLogLevel => ExprLogLevel,
         ExprBreak(opt_ident) => ExprBreak(opt_ident.map(|x| folder.fold_ident(x))),
         ExprAgain(opt_ident) => ExprAgain(opt_ident.map(|x| folder.fold_ident(x))),
         ExprRet(ref e) => {
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 040c4da6885..f52effb8c81 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -25,7 +25,7 @@ use ast::{Expr, Expr_, ExprAddrOf, ExprMatch, ExprAgain};
 use ast::{ExprAssign, ExprAssignOp, ExprBinary, ExprBlock, ExprBox};
 use ast::{ExprBreak, ExprCall, ExprCast};
 use ast::{ExprField, ExprFnBlock, ExprIf, ExprIndex};
-use ast::{ExprLit, ExprLogLevel, ExprLoop, ExprMac};
+use ast::{ExprLit, ExprLoop, ExprMac};
 use ast::{ExprMethodCall, ExprParen, ExprPath, ExprProc};
 use ast::{ExprRepeat, ExprRet, ExprStruct, ExprTup, ExprUnary};
 use ast::{ExprVec, ExprVstore, ExprVstoreSlice};
@@ -1886,12 +1886,6 @@ impl Parser {
                 }
             }
             hi = self.last_span.hi;
-        } else if self.eat_keyword(keywords::__LogLevel) {
-            // LOG LEVEL expression
-            self.expect(&token::LPAREN);
-            ex = ExprLogLevel;
-            hi = self.span.hi;
-            self.expect(&token::RPAREN);
         } else if self.eat_keyword(keywords::Return) {
             // RETURN expression
             if can_begin_expr(&self.token) {
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 36c39220483..b1990476094 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -1490,11 +1490,6 @@ pub fn print_expr(s: &mut State, expr: &ast::Expr) -> io::IoResult<()> {
           _ => ()
         }
       }
-      ast::ExprLogLevel => {
-        try!(word(&mut s.s, "__log_level"));
-        try!(popen(s));
-        try!(pclose(s));
-      }
       ast::ExprInlineAsm(ref a) => {
         if a.volatile {
             try!(word(&mut s.s, "__volatile__ asm!"));
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 538528fb148..880fce58083 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -743,7 +743,6 @@ pub fn walk_expr<E: Clone, V: Visitor<E>>(visitor: &mut V, expression: &Expr, en
         ExprRet(optional_expression) => {
             walk_expr_opt(visitor, optional_expression, env.clone())
         }
-        ExprLogLevel => {}
         ExprMac(ref macro) => visitor.visit_mac(macro, env.clone()),
         ExprParen(subexpression) => {
             visitor.visit_expr(subexpression, env.clone())