auto merge of #9005 : alexcrichton/rust/rusty-log, r=brson

Also redefine all of the standard logging macros to use more rust code instead
of custom LLVM translation code. This makes them a bit easier to understand, but
also more flexibile for future types of logging.

Additionally, this commit removes the LogType language item in preparation for
changing how logging is performed.

Author: bors

src/librustc/middle/cfg/construct.rs

@@ -389,7 +389,6 @@ impl CFGBuilder {
                 self.straightline(expr, pred, [r, l])
             }
 
-            ast::ExprLog(l, r) |
             ast::ExprIndex(_, l, r) |
             ast::ExprBinary(_, _, l, r) => { // NB: && and || handled earlier
                 self.straightline(expr, pred, [l, r])
@@ -405,6 +404,7 @@ impl CFGBuilder {
                 self.straightline(expr, pred, [e])
             }
 
+            ast::ExprLogLevel |
             ast::ExprMac(*) |
             ast::ExprInlineAsm(*) |
             ast::ExprSelf |

src/librustc/middle/dataflow.rs

@@ -702,12 +702,12 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
                 join_bits(&self.dfcx.oper, temp, in_out);
             }
 
-            ast::ExprLog(l, r) |
             ast::ExprIndex(_, l, r) |
             ast::ExprBinary(_, _, l, r) => {
                 self.walk_exprs([l, r], in_out, loop_scopes);
             }
 
+            ast::ExprLogLevel |
             ast::ExprLit(*) |
             ast::ExprPath(*) |
             ast::ExprSelf => {

src/librustc/middle/lang_items.rs

@@ -59,7 +59,6 @@ pub enum LangItem {
 
     StrEqFnLangItem,                   // 19
     UniqStrEqFnLangItem,               // 20
-    LogTypeFnLangItem,                 // 21
     FailFnLangItem,                    // 22
     FailBoundsCheckFnLangItem,         // 23
     ExchangeMallocFnLangItem,          // 24
@@ -238,9 +237,6 @@ impl LanguageItems {
     pub fn uniq_str_eq_fn(&self) -> Option<DefId> {
         self.items[UniqStrEqFnLangItem as uint]
     }
-    pub fn log_type_fn(&self) -> Option<DefId> {
-        self.items[LogTypeFnLangItem as uint]
-    }
     pub fn fail_fn(&self) -> Option<DefId> {
         self.items[FailFnLangItem as uint]
     }
@@ -357,7 +353,6 @@ impl<'self> LanguageItemCollector<'self> {
 
         item_refs.insert(@"str_eq", StrEqFnLangItem as uint);
         item_refs.insert(@"uniq_str_eq", UniqStrEqFnLangItem as uint);
-        item_refs.insert(@"log_type", LogTypeFnLangItem as uint);
         item_refs.insert(@"fail_", FailFnLangItem as uint);
         item_refs.insert(@"fail_bounds_check",
                          FailBoundsCheckFnLangItem as uint);

src/librustc/middle/liveness.rs

@@ -526,7 +526,7 @@ fn visit_expr(v: &mut LivenessVisitor, expr: @Expr, this: @mut IrMaps) {
 
       // otherwise, live nodes are not required:
       ExprIndex(*) | ExprField(*) | ExprVstore(*) | ExprVec(*) |
-      ExprCall(*) | ExprMethodCall(*) | ExprTup(*) | ExprLog(*) |
+      ExprCall(*) | ExprMethodCall(*) | ExprTup(*) | ExprLogLevel |
       ExprBinary(*) | ExprAddrOf(*) |
       ExprDoBody(*) | ExprCast(*) | ExprUnary(*) | ExprBreak(_) |
       ExprAgain(_) | ExprLit(_) | ExprRet(*) | ExprBlock(*) |
@@ -1217,7 +1217,6 @@ impl Liveness {
             self.propagate_through_expr(l, ln)
           }
 
-          ExprLog(l, r) |
           ExprIndex(_, l, r) |
           ExprBinary(_, _, l, r) => {
             self.propagate_through_exprs([l, r], succ)
@@ -1240,6 +1239,7 @@ impl Liveness {
             }
           }
 
+          ExprLogLevel |
           ExprLit(*) => {
             succ
           }
@@ -1496,7 +1496,7 @@ fn check_expr(vt: &mut ErrorCheckVisitor, expr: @Expr, this: @Liveness) {
       // no correctness conditions related to liveness
       ExprCall(*) | ExprMethodCall(*) | ExprIf(*) | ExprMatch(*) |
       ExprWhile(*) | ExprLoop(*) | ExprIndex(*) | ExprField(*) |
-      ExprVstore(*) | ExprVec(*) | ExprTup(*) | ExprLog(*) |
+      ExprVstore(*) | ExprVec(*) | ExprTup(*) | ExprLogLevel |
       ExprBinary(*) | ExprDoBody(*) |
       ExprCast(*) | ExprUnary(*) | ExprRet(*) | ExprBreak(*) |
       ExprAgain(*) | ExprLit(_) | ExprBlock(*) |

src/librustc/middle/mem_categorization.rs

@@ -429,7 +429,7 @@ impl mem_categorization_ctxt {
           ast::ExprDoBody(*) | ast::ExprUnary(*) |
           ast::ExprMethodCall(*) | ast::ExprCast(*) | ast::ExprVstore(*) |
           ast::ExprVec(*) | ast::ExprTup(*) | ast::ExprIf(*) |
-          ast::ExprLog(*) | ast::ExprBinary(*) | ast::ExprWhile(*) |
+          ast::ExprLogLevel | ast::ExprBinary(*) | ast::ExprWhile(*) |
           ast::ExprBlock(*) | ast::ExprLoop(*) | ast::ExprMatch(*) |
           ast::ExprLit(*) | ast::ExprBreak(*) | ast::ExprMac(*) |
           ast::ExprAgain(*) | ast::ExprStruct(*) | ast::ExprRepeat(*) |

src/librustc/middle/moves.rs

@@ -480,6 +480,7 @@ impl VisitContext {
                 self.use_expr(base, Read, visitor);
             }
 
+            ExprLogLevel |
             ExprInlineAsm(*) |
             ExprBreak(*) |
             ExprAgain(*) |
@@ -489,11 +490,6 @@ impl VisitContext {
                 self.consume_block(blk, visitor);
             }
 
-            ExprLog(a_expr, b_expr) => {
-                self.consume_expr(a_expr, visitor);
-                self.use_expr(b_expr, Read, visitor);
-            }
-
             ExprWhile(cond_expr, ref blk) => {
                 self.consume_expr(cond_expr, visitor);
                 self.consume_block(blk, visitor);

src/librustc/middle/trans/controlflow.rs

@@ -8,13 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::c_str::ToCStr;
-
-use back::link;
-use lib;
 use lib::llvm::*;
 use middle::lang_items::{FailFnLangItem, FailBoundsCheckFnLangItem};
-use middle::lang_items::LogTypeFnLangItem;
 use middle::trans::base::*;
 use middle::trans::build::*;
 use middle::trans::callee;
@@ -28,7 +23,6 @@ use middle::trans::type_::Type;
 
 use syntax::ast;
 use syntax::ast::Ident;
-use syntax::ast_map::path_mod;
 use syntax::ast_util;
 use syntax::codemap::Span;
 
@@ -206,72 +200,6 @@ pub fn trans_loop(bcx:@mut Block,
     return next_bcx;
 }
 
-pub fn trans_log(log_ex: &ast::Expr,
-                 lvl: @ast::Expr,
-                 bcx: @mut Block,
-                 e: @ast::Expr) -> @mut Block {
-    let _icx = push_ctxt("trans_log");
-    let ccx = bcx.ccx();
-    let mut bcx = bcx;
-    if ty::type_is_bot(expr_ty(bcx, lvl)) {
-       return expr::trans_into(bcx, lvl, expr::Ignore);
-    }
-
-    let (modpath, modname) = {
-        let path = &mut bcx.fcx.path;
-        let mut modpath = ~[path_mod(ccx.sess.ident_of(ccx.link_meta.name))];
-        for e in path.iter() {
-            match *e {
-                path_mod(_) => { modpath.push(*e) }
-                _ => {}
-            }
-        }
-        let modname = path_str(ccx.sess, modpath);
-        (modpath, modname)
-    };
-
-    let global = if ccx.module_data.contains_key(&modname) {
-        ccx.module_data.get_copy(&modname)
-    } else {
-        let s = link::mangle_internal_name_by_path_and_seq(
-            ccx, modpath, "loglevel");
-        let global;
-        unsafe {
-            global = do s.with_c_str |buf| {
-                llvm::LLVMAddGlobal(ccx.llmod, Type::i32().to_ref(), buf)
-            };
-            llvm::LLVMSetGlobalConstant(global, False);
-            llvm::LLVMSetInitializer(global, C_null(Type::i32()));
-            lib::llvm::SetLinkage(global, lib::llvm::InternalLinkage);
-        }
-        ccx.module_data.insert(modname, global);
-        global
-    };
-    let current_level = Load(bcx, global);
-    let level = unpack_result!(bcx, {
-        do with_scope_result(bcx, lvl.info(), "level") |bcx| {
-            expr::trans_to_datum(bcx, lvl).to_result()
-        }
-    });
-
-    let llenabled = ICmp(bcx, lib::llvm::IntUGE, current_level, level);
-    do with_cond(bcx, llenabled) |bcx| {
-        do with_scope(bcx, log_ex.info(), "log") |bcx| {
-            let mut bcx = bcx;
-
-            // Translate the value to be logged
-            let val_datum = unpack_datum!(bcx, expr::trans_to_datum(bcx, e));
-
-            // Call the polymorphic log function
-            let val = val_datum.to_ref_llval(bcx);
-            let did = langcall(bcx, Some(e.span), "", LogTypeFnLangItem);
-            let bcx = callee::trans_lang_call_with_type_params(
-                bcx, did, [level, val], [val_datum.ty], expr::Ignore);
-            bcx
-        }
-    }
-}
-
 pub fn trans_break_cont(bcx: @mut Block,
                         opt_label: Option<Ident>,
                         to_end: bool)

src/librustc/middle/trans/debuginfo.rs

@@ -1995,6 +1995,7 @@ fn populate_scope_map(cx: &mut CrateContext,
         scope_map.insert(exp.id, scope_stack.last().scope_metadata);
 
         match exp.node {
+            ast::ExprLogLevel |
             ast::ExprSelf     |
             ast::ExprLit(_)   |
             ast::ExprBreak(_) |
@@ -2033,7 +2034,6 @@ fn populate_scope_map(cx: &mut CrateContext,
             }
 
             ast::ExprAssign(@ref sub_exp1, @ref sub_exp2)    |
-            ast::ExprLog(@ref sub_exp1, @ref sub_exp2)       |
             ast::ExprRepeat(@ref sub_exp1, @ref sub_exp2, _) => {
                 walk_expr(cx, sub_exp1, scope_stack, scope_map);
                 walk_expr(cx, sub_exp2, scope_stack, scope_map);

src/librustc/middle/trans/expr.rs

@@ -115,7 +115,8 @@ return type, such as `while` loops or assignments (`a = b`).
 
 
 use back::abi;
-use lib::llvm::{ValueRef, llvm, SetLinkage, ExternalLinkage};
+use back::link;
+use lib::llvm::{ValueRef, llvm, SetLinkage, ExternalLinkage, False};
 use lib;
 use metadata::csearch;
 use middle::trans::_match;
@@ -150,6 +151,7 @@ use std::hashmap::HashMap;
 use std::vec;
 use syntax::print::pprust::{expr_to_str};
 use syntax::ast;
+use syntax::ast_map::path_mod;
 use syntax::codemap;
 
 // Destinations
@@ -578,6 +580,9 @@ fn trans_rvalue_datum_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBloc
         ast::ExprParen(e) => {
             return trans_rvalue_datum_unadjusted(bcx, e);
         }
+        ast::ExprLogLevel => {
+            return trans_log_level(bcx);
+        }
         _ => {
             bcx.tcx().sess.span_bug(
                 expr.span,
@@ -608,9 +613,6 @@ fn trans_rvalue_stmt_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> @mut Block
         ast::ExprRet(ex) => {
             return controlflow::trans_ret(bcx, ex);
         }
-        ast::ExprLog(lvl, a) => {
-            return controlflow::trans_log(expr, lvl, bcx, a);
-        }
         ast::ExprWhile(cond, ref body) => {
             return controlflow::trans_while(bcx, cond, body);
         }
@@ -1757,3 +1759,41 @@ fn trans_assign_op(bcx: @mut Block,
 fn shorten(x: &str) -> @str {
     (if x.char_len() > 60 {x.slice_chars(0, 60)} else {x}).to_managed()
 }
+
+pub fn trans_log_level(bcx: @mut Block) -> DatumBlock {
+    let _icx = push_ctxt("trans_log_level");
+    let ccx = bcx.ccx();
+
+    let (modpath, modname) = {
+        let path = &mut bcx.fcx.path;
+        let mut modpath = ~[path_mod(ccx.sess.ident_of(ccx.link_meta.name))];
+        for e in path.iter() {
+            match *e {
+                path_mod(_) => { modpath.push(*e) }
+                _ => {}
+            }
+        }
+        let modname = path_str(ccx.sess, modpath);
+        (modpath, modname)
+    };
+
+    let global = if ccx.module_data.contains_key(&modname) {
+        ccx.module_data.get_copy(&modname)
+    } else {
+        let s = link::mangle_internal_name_by_path_and_seq(
+            ccx, modpath, "loglevel");
+        let global;
+        unsafe {
+            global = do s.with_c_str |buf| {
+                llvm::LLVMAddGlobal(ccx.llmod, Type::i32().to_ref(), buf)
+            };
+            llvm::LLVMSetGlobalConstant(global, False);
+            llvm::LLVMSetInitializer(global, C_null(Type::i32()));
+            lib::llvm::SetLinkage(global, lib::llvm::InternalLinkage);
+        }
+        ccx.module_data.insert(modname, global);
+        global
+    };
+
+    return immediate_rvalue_bcx(bcx, Load(bcx, global), ty::mk_u32());
+}

src/librustc/middle/trans/type_use.rs

@@ -377,9 +377,6 @@ pub fn mark_for_expr(cx: &Context, e: &Expr) {
         let base_ty = ty::node_id_to_type(cx.ccx.tcx, base.id);
         type_needs(cx, use_repr, ty::type_autoderef(cx.ccx.tcx, base_ty));
       }
-      ExprLog(_, val) => {
-        node_type_needs(cx, use_tydesc, val.id);
-      }
       ExprCall(f, _, _) => {
           let r = ty::ty_fn_args(ty::node_id_to_type(cx.ccx.tcx, f.id));
           for a in r.iter() {
@@ -411,7 +408,7 @@ pub fn mark_for_expr(cx: &Context, e: &Expr) {
       ExprMatch(*) | ExprBlock(_) | ExprIf(*) | ExprWhile(*) |
       ExprBreak(_) | ExprAgain(_) | ExprUnary(*) | ExprLit(_) |
       ExprMac(_) | ExprAddrOf(*) | ExprRet(_) | ExprLoop(*) |
-      ExprDoBody(_) => (),
+      ExprDoBody(_) | ExprLogLevel => (),
 
       ExprForLoop(*) => fail!("non-desugared expr_for_loop")
     }

src/librustc/middle/ty.rs

@@ -3320,7 +3320,6 @@ pub fn expr_kind(tcx: ctxt,
         ast::ExprBreak(*) |
         ast::ExprAgain(*) |
         ast::ExprRet(*) |
-        ast::ExprLog(*) |
         ast::ExprWhile(*) |
         ast::ExprLoop(*) |
         ast::ExprAssign(*) |
@@ -3331,6 +3330,7 @@ pub fn expr_kind(tcx: ctxt,
 
         ast::ExprForLoop(*) => fail!("non-desugared expr_for_loop"),
 
+        ast::ExprLogLevel |
         ast::ExprLit(_) | // Note: lit_str is carved out above
         ast::ExprUnary(*) |
         ast::ExprAddrOf(*) |

src/librustc/middle/typeck/check/mod.rs

@@ -2526,18 +2526,8 @@ pub fn check_expr_with_unifier(fcx: @mut FnCtxt,
         }
         fcx.write_bot(id);
       }
-      ast::ExprLog(lv, e) => {
-        check_expr_has_type(fcx, lv,
-                                  ty::mk_mach_uint(ast::ty_u32));
-
-        // Note: this does not always execute, so do not propagate bot:
-        check_expr(fcx, e);
-        if ty::type_is_error(fcx.expr_ty(e)) {
-            fcx.write_error(id);
-        }
-        else {
-            fcx.write_nil(id);
-        }
+      ast::ExprLogLevel => {
+        fcx.write_ty(id, ty::mk_u32())
       }
       ast::ExprParen(a) => {
         check_expr_with_opt_hint(fcx, a, expected);

src/librustc/middle/typeck/check/regionck.rs

@@ -1020,7 +1020,7 @@ pub mod guarantor {
             ast::ExprBreak(*) |
             ast::ExprAgain(*) |
             ast::ExprRet(*) |
-            ast::ExprLog(*) |
+            ast::ExprLogLevel |
             ast::ExprWhile(*) |
             ast::ExprLoop(*) |
             ast::ExprAssign(*) |

src/libstd/logging.rs

@@ -37,7 +37,7 @@ pub fn console_off() {
     rt::logging::console_off();
 }
 
-#[cfg(not(test))]
+#[cfg(not(test), stage0)]
 #[lang="log_type"]
 #[allow(missing_doc)]
 pub fn log_type<T>(_level: u32, object: &T) {
@@ -67,3 +67,10 @@ fn newsched_log_str(msg: ~str) {
         }
     }
 }
+
+// XXX: This will change soon to not require an allocation. This is an unstable
+//      api which should not be used outside of the macros in ext/expand.
+#[doc(hidden)]
+pub fn log(_level: u32, msg: ~str) {
+    newsched_log_str(msg);
+}