auto merge of rust-lang#9809 : fhahn/rust/remove-old-cratemap-code, r=alexcrichton

This patch removes the code responsible for handling older CrateMap versions (as discussed during rust-lang#9593). Only the new (safer) layout is supported now.

Author: bors

src/libstd/rt/crate_map.rs

@@ -13,45 +13,13 @@ use hashmap::HashSet;
 use option::{Some, None, Option};
 use vec::ImmutableVector;
 
-/// Imports for old crate map versions
-use cast::transmute;
-use libc::c_char;
-use ptr;
-use str::raw::from_c_str;
-use vec;
-
 // Need to tell the linker on OS X to not barf on undefined symbols
 // and instead look them up at runtime, which we need to resolve
 // the crate_map properly.
 #[cfg(target_os = "macos")]
 #[link_args = "-undefined dynamic_lookup"]
 extern {}
 
-#[cfg(not(windows))]
-extern {
-    #[weak_linkage]
-    #[link_name = "_rust_crate_map_toplevel"]
-    static CRATE_MAP: CrateMap<'static>;
-}
-
-/// structs for old crate map versions
-pub struct ModEntryV0 {
-    name: *c_char,
-    log_level: *mut u32
-}
-pub struct CrateMapV0 {
-    entries: *ModEntryV0,
-    children: [*CrateMapV0, ..1]
-}
-
-pub struct CrateMapV1 {
-    version: i32,
-    entries: *ModEntryV0,
-    /// a dynamically sized struct, where all pointers to children are listed adjacent
-    /// to the struct, terminated with NULL
-    children: [*CrateMapV1, ..1]
-}
-
 pub struct ModEntry<'self> {
     name: &'self str,
     log_level: *mut u32
@@ -65,6 +33,12 @@ pub struct CrateMap<'self> {
 
 #[cfg(not(windows))]
 pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
+    extern {
+        #[weak_linkage]
+        #[link_name = "_rust_crate_map_toplevel"]
+        static CRATE_MAP: CrateMap<'static>;
+    }
+
     let ptr: (*CrateMap) = &'static CRATE_MAP;
     if ptr.is_null() {
         return None;
@@ -77,6 +51,7 @@ pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
 #[fixed_stack_segment]
 #[inline(never)]
 pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
+    use cast::transmute;
     use c_str::ToCStr;
     use unstable::dynamic_lib::dl;
 
@@ -101,54 +76,23 @@ pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
 fn version(crate_map: &CrateMap) -> i32 {
     match crate_map.version {
         2 => return 2,
-        1 => return 1,
         _ => return 0
     }
 }
 
-fn iter_module_map(mod_entries: &[ModEntry], f: &fn(&ModEntry)) {
-    for entry in mod_entries.iter() {
-        f(entry);
-    }
-}
-
-unsafe fn iter_module_map_v0(entries: *ModEntryV0, f: &fn(&ModEntry)) {
-    let mut curr = entries;
-    while !(*curr).name.is_null() {
-        let mod_entry = ModEntry { name: from_c_str((*curr).name), log_level: (*curr).log_level };
-        f(&mod_entry);
-        curr = curr.offset(1);
-    }
-}
-
 fn do_iter_crate_map<'a>(crate_map: &'a CrateMap<'a>, f: &fn(&ModEntry),
                             visited: &mut HashSet<*CrateMap<'a>>) {
     if visited.insert(crate_map as *CrateMap) {
         match version(crate_map) {
             2 => {
                 let (entries, children) = (crate_map.entries, crate_map.children);
-                iter_module_map(entries, |x| f(x));
+                for entry in entries.iter() {
+                    f(entry);
+                }
                 for child in children.iter() {
                     do_iter_crate_map(*child, |x| f(x), visited);
                 }
             },
-            // code for old crate map versions
-            1 => unsafe {
-                let v1: *CrateMapV1 = transmute(crate_map);
-                iter_module_map_v0((*v1).entries, |x| f(x));
-                let children = vec::raw::to_ptr((*v1).children);
-                do ptr::array_each(children) |child| {
-                    do_iter_crate_map(transmute(child), |x| f(x), visited);
-                }
-            },
-            0 => unsafe {
-                let v0: *CrateMapV0 = transmute(crate_map);
-                iter_module_map_v0((*v0).entries, |x| f(x));
-                let children = vec::raw::to_ptr((*v0).children);
-                do ptr::array_each(children) |child| {
-                    do_iter_crate_map(transmute(child), |x| f(x), visited);
-                }
-            },
             _ => fail2!("invalid crate map version")
         }
     }
@@ -234,108 +178,4 @@ mod tests {
             assert!(cnt == 4);
         }
     }
-
-
-    /// Tests for old crate map versions
-    #[test]
-    fn iter_crate_map_duplicates_v1() {
-        use c_str::ToCStr;
-        use cast::transmute;
-        use ptr;
-        use rt::crate_map::{CrateMapV1, ModEntryV0, iter_crate_map};
-        use vec;
-
-        struct CrateMapT3 {
-            version: i32,
-            entries: *ModEntryV0,
-            children: [*CrateMapV1, ..3]
-        }
-
-        unsafe {
-            let mod_name1 = "c::m1".to_c_str();
-            let mut level3: u32 = 3;
-
-            let entries: ~[ModEntryV0] = ~[
-                ModEntryV0 { name: mod_name1.with_ref(|buf| buf), log_level: &mut level3},
-                ModEntryV0 { name: ptr::null(), log_level: ptr::mut_null()}
-            ];
-            let child_crate = CrateMapV1 {
-                version: 1,
-                entries: vec::raw::to_ptr(entries),
-                children: [ptr::null()]
-            };
-
-            let root_crate = CrateMapT3 {
-                version: 1,
-                entries: vec::raw::to_ptr([
-                    ModEntryV0 { name: ptr::null(), log_level: ptr::mut_null()}
-                ]),
-                children: [&child_crate as *CrateMapV1, &child_crate as *CrateMapV1, ptr::null()]
-            };
-
-            let mut cnt = 0;
-            do iter_crate_map(transmute(&root_crate)) |entry| {
-                assert!(*(*entry).log_level == 3);
-                cnt += 1;
-            }
-            assert!(cnt == 1);
-        }
-    }
-
-    #[test]
-    fn iter_crate_map_follow_children_v1() {
-        use c_str::ToCStr;
-        use cast::transmute;
-        use ptr;
-        use rt::crate_map::{CrateMapV1, ModEntryV0, iter_crate_map};
-        use vec;
-
-        struct CrateMapT2 {
-            version: i32,
-            entries: *ModEntryV0,
-            children: [*CrateMapV1, ..2]
-        }
-
-        unsafe {
-            let mod_name1 = "c::m1".to_c_str();
-            let mod_name2 = "c::m2".to_c_str();
-            let mut level2: u32 = 2;
-            let mut level3: u32 = 3;
-            let child_crate2 = CrateMapV1 {
-                version: 1,
-                entries: vec::raw::to_ptr([
-                    ModEntryV0 { name: mod_name1.with_ref(|buf| buf), log_level: &mut level2},
-                    ModEntryV0 { name: mod_name2.with_ref(|buf| buf), log_level: &mut level3},
-                    ModEntryV0 { name: ptr::null(), log_level: ptr::mut_null()}
-                ]),
-                children: [ptr::null()]
-            };
-
-            let child_crate1 = CrateMapT2 {
-                version: 1,
-                entries: vec::raw::to_ptr([
-                    ModEntryV0 { name: "t::f1".with_c_str(|buf| buf), log_level: &mut 1},
-                    ModEntryV0 { name: ptr::null(), log_level: ptr::mut_null()}
-                ]),
-                children: [&child_crate2 as *CrateMapV1, ptr::null()]
-            };
-
-            let child_crate1_ptr: *CrateMapV1 = transmute(&child_crate1);
-            let root_crate = CrateMapT2 {
-                version: 1,
-                entries: vec::raw::to_ptr([
-                    ModEntryV0 { name: "t::f1".with_c_str(|buf| buf), log_level: &mut 0},
-                    ModEntryV0 { name: ptr::null(), log_level: ptr::mut_null()}
-                ]),
-                children: [child_crate1_ptr, ptr::null()]
-            };
-
-            let mut cnt = 0;
-            do iter_crate_map(transmute(&root_crate)) |entry| {
-                assert!(*(*entry).log_level == cnt);
-                cnt += 1;
-            }
-            assert!(cnt == 4);
-        }
-    }
 }