Refactor the logging system for fewer allocations

This lifts various restrictions on the runtime, for example the character limit
when logging a message. Right now the old debug!-style macros still involve
allocating (because they use fmt! syntax), but the new debug2! macros don't
involve allocating at all (unless the formatter for a type requires allocation.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 64f30803ca7..80cb9424fa1 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -813,13 +813,17 @@ pub fn std_macros() -> @str {
         ($lvl:expr, $arg:expr) => ({
             let lvl = $lvl;
             if lvl <= __log_level() {
-                ::std::logging::log(lvl, fmt!(\"%?\", $arg))
+                format_args!(|args| {
+                    ::std::logging::log(lvl, args)
+                }, \"{}\", fmt!(\"%?\", $arg))
             }
         });
         ($lvl:expr, $($arg:expr),+) => ({
             let lvl = $lvl;
             if lvl <= __log_level() {
-                ::std::logging::log(lvl, fmt!($($arg),+))
+                format_args!(|args| {
+                    ::std::logging::log(lvl, args)
+                }, \"{}\", fmt!($($arg),+))
             }
         })
     )
@@ -834,7 +838,9 @@ pub fn std_macros() -> @str {
         ($lvl:expr, $($arg:tt)+) => ({
             let lvl = $lvl;
             if lvl <= __log_level() {
-                ::std::logging::log(lvl, format!($($arg)+))
+                format_args!(|args| {
+                    ::std::logging::log(lvl, args)
+                }, $($arg)+)
             }
         })
     )