rustc: Remove all crate map support

The crate map is no longer necessary now that logging and event loop factories
have been moved out.

Closes #11617
Closes #11731

Author: alexcrichton

src/librustc/driver/session.rs

@@ -451,8 +451,6 @@ cgoptions!(
         "don't run LLVM's SLP vectorization pass"),
     soft_float: bool = (false, parse_bool,
         "generate software floating point library calls"),
-    gen_crate_map: bool = (false, parse_bool,
-        "force generation of a toplevel crate map"),
     prefer_dynamic: bool = (false, parse_bool,
         "prefer dynamic linking to static linking"),
     no_integrated_as: bool = (false, parse_bool,

src/librustc/middle/lang_items.rs

@@ -254,8 +254,6 @@ lets_do_this! {
     TyVisitorTraitLangItem,          "ty_visitor",              ty_visitor;
     OpaqueStructLangItem,            "opaque",                  opaque;
 
-    EventLoopFactoryLangItem,        "event_loop_factory",      event_loop_factory;
-
     TypeIdLangItem,                  "type_id",                 type_id;
 
     EhPersonalityLangItem,           "eh_personality",          eh_personality_fn;

src/librustc/middle/lint.rs

@@ -980,7 +980,7 @@ static other_attrs: &'static [&'static str] = &[
     "thread_local", // for statics
     "allow", "deny", "forbid", "warn", // lint options
     "deprecated", "experimental", "unstable", "stable", "locked", "frozen", //item stability
-    "crate_map", "cfg", "doc", "export_name", "link_section",
+    "cfg", "doc", "export_name", "link_section",
     "no_mangle", "static_assert", "unsafe_no_drop_flag", "packed",
     "simd", "repr", "deriving", "unsafe_destructor", "link", "phase",
     "macro_export", "must_use", "automatically_derived",

src/librustc/middle/trans/base.rs

@@ -76,7 +76,7 @@ use std::c_str::ToCStr;
 use std::cell::{Cell, RefCell};
 use std::libc::c_uint;
 use std::local_data;
-use syntax::abi::{X86, X86_64, Arm, Mips, Rust, RustIntrinsic, OsWin32};
+use syntax::abi::{X86, X86_64, Arm, Mips, Rust, RustIntrinsic};
 use syntax::ast_map::PathName;
 use syntax::ast_util::{local_def, is_local};
 use syntax::attr::AttrMetaMethods;
@@ -2316,65 +2316,6 @@ pub fn symname(name: &str, hash: &str, vers: &str) -> ~str {
     link::exported_name(ast_map::Values(path.iter()).chain(None), hash, vers)
 }
 
-pub fn decl_crate_map(ccx: &mut CrateContext) {
-    let mut n_subcrates = 1;
-    while ccx.sess().cstore.have_crate_data(n_subcrates) {
-        n_subcrates += 1;
-    }
-    let is_top = !ccx.sess().building_library.get() || ccx.sess().opts.cg.gen_crate_map;
-    let sym_name = if is_top {
-        ~"_rust_crate_map_toplevel"
-    } else {
-        symname("_rust_crate_map_" + ccx.link_meta.crateid.name,
-                ccx.link_meta.crate_hash.as_str(),
-                ccx.link_meta.crateid.version_or_default())
-    };
-
-    let maptype = Type::struct_(ccx, [
-        Type::i32(ccx),        // version
-        ccx.int_type.ptr_to(), // event loop factory
-    ], false);
-    let map = sym_name.with_c_str(|buf| {
-        unsafe {
-            llvm::LLVMAddGlobal(ccx.llmod, maptype.to_ref(), buf)
-        }
-    });
-    lib::llvm::SetLinkage(map, lib::llvm::ExternalLinkage);
-
-    // On windows we'd like to export the toplevel cratemap
-    // such that we can find it from libstd.
-    if ccx.sess().targ_cfg.os == OsWin32 && is_top {
-        unsafe { llvm::LLVMRustSetDLLExportStorageClass(map) }
-    }
-
-    ccx.crate_map_name = sym_name;
-    ccx.crate_map = map;
-}
-
-pub fn fill_crate_map(ccx: &CrateContext, map: ValueRef) {
-    let event_loop_factory = match ccx.tcx.lang_items.event_loop_factory() {
-        Some(did) => unsafe {
-            if is_local(did) {
-                llvm::LLVMConstPointerCast(get_item_val(ccx, did.node),
-                                           ccx.int_type.ptr_to().to_ref())
-            } else {
-                let name = csearch::get_symbol(&ccx.sess().cstore, did);
-                let global = name.with_c_str(|buf| {
-                    llvm::LLVMAddGlobal(ccx.llmod, ccx.int_type.to_ref(), buf)
-                });
-                global
-            }
-        },
-        None => C_null(ccx.int_type.ptr_to())
-    };
-    unsafe {
-        llvm::LLVMSetInitializer(map, C_struct(ccx,
-            [C_i32(ccx, 2),
-            event_loop_factory,
-        ], false));
-    }
-}
-
 pub fn crate_ctxt_to_encode_parms<'r>(cx: &'r CrateContext, ie: encoder::EncodeInlinedItem<'r>)
     -> encoder::EncodeParams<'r> {
 
@@ -2467,26 +2408,6 @@ pub fn trans_crate(krate: ast::Crate,
         trans_mod(&ccx, &krate.module);
     }
 
-    fill_crate_map(&ccx, ccx.crate_map);
-
-    // win32: wart with exporting crate_map symbol
-    // We set the crate map (_rust_crate_map_toplevel) to use dll_export
-    // linkage but that ends up causing the linker to look for a
-    // __rust_crate_map_toplevel symbol (extra underscore) which it will
-    // subsequently fail to find. So to mitigate that we just introduce
-    // an alias from the symbol it expects to the one that actually exists.
-    if ccx.sess().targ_cfg.os == OsWin32 && !ccx.sess().building_library.get() {
-
-        let maptype = val_ty(ccx.crate_map).to_ref();
-
-        "__rust_crate_map_toplevel".with_c_str(|buf| {
-            unsafe {
-                llvm::LLVMAddAlias(ccx.llmod, maptype,
-                                   ccx.crate_map, buf);
-            }
-        })
-    }
-
     glue::emit_tydescs(&ccx);
     if ccx.sess().opts.debuginfo != NoDebugInfo {
         debuginfo::finalize(&ccx);
@@ -2537,7 +2458,6 @@ pub fn trans_crate(krate: ast::Crate,
     // symbol. This symbol is required for use by the libmorestack library that
     // we link in, so we must ensure that this symbol is not internalized (if
     // defined in the crate).
-    reachable.push(ccx.crate_map_name.to_owned());
     reachable.push(~"main");
     reachable.push(~"rust_stack_exhausted");
     reachable.push(~"rust_eh_personality"); // referenced from .eh_frame section on some platforms

src/librustc/middle/trans/context.rs

@@ -22,7 +22,6 @@ use middle::trans::base;
 use middle::trans::builder::Builder;
 use middle::trans::common::{C_i32, C_null};
 use middle::trans::common::{mono_id,ExternMap,tydesc_info,BuilderRef_res,Stats};
-use middle::trans::base::{decl_crate_map};
 use middle::trans::debuginfo;
 use middle::trans::type_::Type;
 use middle::ty;
@@ -105,8 +104,6 @@ pub struct CrateContext {
     int_type: Type,
     opaque_vec_type: Type,
     builder: BuilderRef_res,
-    crate_map: ValueRef,
-    crate_map_name: ~str,
     // Set when at least one function uses GC. Needed so that
     // decl_gc_metadata knows whether to link to the module metadata, which
     // is not emitted by LLVM's GC pass when no functions use GC.
@@ -200,8 +197,6 @@ impl CrateContext {
                 int_type: Type::from_ref(ptr::null()),
                 opaque_vec_type: Type::from_ref(ptr::null()),
                 builder: BuilderRef_res(llvm::LLVMCreateBuilderInContext(llcx)),
-                crate_map: ptr::null(),
-                crate_map_name: ~"",
                 uses_gc: false,
                 dbg_cx: dbg_cx,
             };
@@ -215,8 +210,6 @@ impl CrateContext {
             str_slice_ty.set_struct_body([Type::i8p(&ccx), ccx.int_type], false);
             ccx.tn.associate_type("str_slice", &str_slice_ty);
 
-            decl_crate_map(&mut ccx);
-
             base::declare_intrinsics(&mut ccx);
 
             if ccx.sess().count_llvm_insns() {

src/librustc/middle/trans/foreign.rs

@@ -134,28 +134,6 @@ pub fn register_static(ccx: &CrateContext,
     let ty = ty::node_id_to_type(ccx.tcx(), foreign_item.id);
     let llty = type_of::type_of(ccx, ty);
 
-    // Treat the crate map static specially in order to
-    // a weak-linkage-like functionality where it's
-    // dynamically resolved at runtime. If we're
-    // building a library, then we declare the static
-    // with weak linkage, but if we're building a
-    // library then we've already declared the crate map
-    // so use that instead.
-    if attr::contains_name(foreign_item.attrs.as_slice(), "crate_map") {
-        return if ccx.sess().building_library.get() {
-            let s = "_rust_crate_map_toplevel";
-            let g = unsafe {
-                s.with_c_str(|buf| {
-                    llvm::LLVMAddGlobal(ccx.llmod, llty.to_ref(), buf)
-                })
-            };
-            lib::llvm::SetLinkage(g, lib::llvm::ExternalWeakLinkage);
-            g
-        } else {
-            ccx.crate_map
-        }
-    }
-
     let ident = link_name(foreign_item);
     match attr::first_attr_value_str_by_name(foreign_item.attrs.as_slice(),
                                              "linkage") {

src/libstd/rt/crate_map.rs

@@ -104,9 +104,6 @@ pub mod env;
 /// The local, managed heap
 pub mod local_heap;
 
-/// Crate map
-pub mod crate_map;
-
 /// The runtime needs to be able to put a pointer into thread-local storage.
 mod local_ptr;
 

src/libstd/rt/mod.rs

@@ -1,7 +1,7 @@
 -include ../tools.mk
 
 all:
-	$(RUSTC) lib.rs -C gen-crate-map
+	$(RUSTC) lib.rs
 	ln -nsf $(call DYLIB,boot-*) $(call DYLIB,boot)
 	$(CC) main.c -o $(call RUN,main) -lboot
 	$(call RUN,main)

src/test/run-make/bootstrap-from-c-with-green/Makefile

@@ -1,7 +1,7 @@
 -include ../tools.mk
 
 all:
-	$(RUSTC) lib.rs -C gen-crate-map
+	$(RUSTC) lib.rs
 	ln -nsf $(call DYLIB,boot-*) $(call DYLIB,boot)
 	$(CC) main.c -o $(call RUN,main) -lboot
 	$(call RUN,main)

src/test/run-make/bootstrap-from-c-with-native/Makefile

@@ -5,7 +5,7 @@ ifneq ($(shell uname),Darwin)
 endif
 
 all:
-	$(RUSTC) foo.rs -C gen-crate-map
+	$(RUSTC) foo.rs
 	ln -s $(call STATICLIB,foo-*) $(call STATICLIB,foo)
 	$(CC) bar.c -lfoo -o $(call RUN,bar) $(EXTRAFLAGS) -lstdc++
 	$(call RUN,bar)