Auto merge of rust-lang#53354 - kennytm:rollup, r=kennytm

Rollup of 11 pull requests

Successful merges:

 - rust-lang#53112 (pretty print BTreeSet)
 - rust-lang#53208 (Don't panic on std::env::vars() when env is null.)
 - rust-lang#53226 (driver: set the syntax edition in phase 1)
 - rust-lang#53229 (Make sure rlimit is only ever increased)
 - rust-lang#53233 (targets: aarch64: Add bare-metal aarch64 target)
 - rust-lang#53239 (rustc_codegen_llvm: Restore the closure env alloca hack for LLVM 5.)
 - rust-lang#53246 (A few cleanups)
 - rust-lang#53257 (Idiomatic improvements to IP method)
 - rust-lang#53274 (Remove statics field from CodegenCx)
 - rust-lang#53290 (Make LLVM emit assembly comments with -Z asm-comments)
 - rust-lang#53317 (Mark prior failure to avoid ICE)

src/etc/debugger_pretty_printers_common.py

@@ -48,6 +48,7 @@
 TYPE_KIND_REGULAR_UNION     = 17
 TYPE_KIND_OS_STRING         = 18
 TYPE_KIND_STD_VECDEQUE      = 19
+TYPE_KIND_STD_BTREESET      = 20
 
 ENCODED_ENUM_PREFIX = "RUST$ENCODED$ENUM$"
 ENUM_DISR_FIELD_NAME = "RUST$ENUM$DISR"
@@ -71,6 +72,9 @@
                             STD_VECDEQUE_FIELD_NAME_HEAD,
                             STD_VECDEQUE_FIELD_NAME_BUF]
 
+# std::collections::BTreeSet<> related constants
+STD_BTREESET_FIELD_NAMES = ["map"]
+
 # std::String related constants
 STD_STRING_FIELD_NAMES = ["vec"]
 
@@ -175,6 +179,11 @@ def __classify_struct(self):
             self.__conforms_to_field_layout(STD_VECDEQUE_FIELD_NAMES)):
             return TYPE_KIND_STD_VECDEQUE
 
+        # STD COLLECTION BTREESET
+        if (unqualified_type_name.startswith("BTreeSet<") and
+                self.__conforms_to_field_layout(STD_BTREESET_FIELD_NAMES)):
+            return TYPE_KIND_STD_BTREESET
+
         # STD STRING
         if (unqualified_type_name.startswith("String") and
             self.__conforms_to_field_layout(STD_STRING_FIELD_NAMES)):
@@ -358,6 +367,19 @@ def extract_tail_head_ptr_and_cap_from_std_vecdeque(vec_val):
     return (tail, head, data_ptr, capacity)
 
 
+def extract_length_and_ptr_from_std_btreeset(vec_val):
+    assert vec_val.type.get_type_kind() == TYPE_KIND_STD_BTREESET
+    map = vec_val.get_child_at_index(0)
+    root = map.get_child_at_index(0)
+    length = map.get_child_at_index(1).as_integer()
+    node = root.get_child_at_index(0)
+    ptr = node.get_child_at_index(0)
+    unique_ptr_val = ptr.get_child_at_index(0)
+    data_ptr = unique_ptr_val.get_child_at_index(0)
+    assert data_ptr.type.get_dwarf_type_kind() == DWARF_TYPE_CODE_PTR
+    return (length, data_ptr)
+
+
 def extract_length_and_ptr_from_slice(slice_val):
     assert (slice_val.type.get_type_kind() == TYPE_KIND_SLICE or
             slice_val.type.get_type_kind() == TYPE_KIND_STR_SLICE)

src/etc/gdb_rust_pretty_printing.py

@@ -127,6 +127,9 @@ def rust_pretty_printer_lookup_function(gdb_val):
     if type_kind == rustpp.TYPE_KIND_STD_VECDEQUE:
         return RustStdVecDequePrinter(val)
 
+    if type_kind == rustpp.TYPE_KIND_STD_BTREESET:
+        return RustStdBTreeSetPrinter(val)
+
     if type_kind == rustpp.TYPE_KIND_STD_STRING:
         return RustStdStringPrinter(val)
 
@@ -299,6 +302,29 @@ def children(self):
             yield (str(index), (gdb_ptr + index).dereference())
 
 
+class RustStdBTreeSetPrinter(object):
+    def __init__(self, val):
+        self.__val = val
+
+    @staticmethod
+    def display_hint():
+        return "array"
+
+    def to_string(self):
+        (length, data_ptr) = \
+            rustpp.extract_length_and_ptr_from_std_btreeset(self.__val)
+        return (self.__val.type.get_unqualified_type_name() +
+                ("(len: %i)" % length))
+
+    def children(self):
+        (length, data_ptr) = \
+            rustpp.extract_length_and_ptr_from_std_btreeset(self.__val)
+        val = GdbValue(data_ptr.get_wrapped_value().dereference()).get_child_at_index(3)
+        gdb_ptr = val.get_wrapped_value()
+        for index in xrange(length):
+            yield (str(index), gdb_ptr[index])
+
+
 class RustStdStringPrinter(object):
     def __init__(self, val):
         self.__val = val

src/libfmt_macros/lib.rs

@@ -411,7 +411,7 @@ impl<'a> Parser<'a> {
 
         // fill character
         if let Some(&(_, c)) = self.cur.peek() {
-            match self.cur.clone().skip(1).next() {
+            match self.cur.clone().nth(1) {
                 Some((_, '>')) | Some((_, '<')) | Some((_, '^')) => {
                     spec.fill = Some(c);
                     self.cur.next();
@@ -504,13 +504,11 @@ impl<'a> Parser<'a> {
             if word.is_empty() {
                 self.cur = tmp;
                 CountImplied
+            } else if self.consume('$') {
+                CountIsName(word)
             } else {
-                if self.consume('$') {
-                    CountIsName(word)
-                } else {
-                    self.cur = tmp;
-                    CountImplied
-                }
+                self.cur = tmp;
+                CountImplied
             }
         }
     }

src/libgraphviz/lib.rs

@@ -420,7 +420,8 @@ impl<'a> Id<'a> {
         if !name.chars().all(|c| c.is_ascii_alphanumeric() || c == '_' ) {
             return Err(());
         }
-        return Ok(Id { name: name });
+
+        Ok(Id { name })
     }
 
     pub fn as_slice(&'a self) -> &'a str {
@@ -533,10 +534,10 @@ impl<'a> LabelText<'a> {
     /// Renders text as string suitable for a label in a .dot file.
     /// This includes quotes or suitable delimiters.
     pub fn to_dot_string(&self) -> String {
-        match self {
-            &LabelStr(ref s) => format!("\"{}\"", s.escape_default()),
-            &EscStr(ref s) => format!("\"{}\"", LabelText::escape_str(&s)),
-            &HtmlStr(ref s) => format!("<{}>", s),
+        match *self {
+            LabelStr(ref s) => format!("\"{}\"", s.escape_default()),
+            EscStr(ref s) => format!("\"{}\"", LabelText::escape_str(&s)),
+            HtmlStr(ref s) => format!("<{}>", s),
         }
     }
 

src/librustc_apfloat/ieee.rs

@@ -536,23 +536,21 @@ impl<S: Semantics> fmt::Display for IeeeFloat<S> {
         // Check whether we should use scientific notation.
         let scientific = if width == 0 {
             true
+        } else if exp >= 0 {
+            // 765e3 --> 765000
+            //              ^^^
+            // But we shouldn't make the number look more precise than it is.
+            exp as usize > width || digits + exp as usize > precision
         } else {
-            if exp >= 0 {
-                // 765e3 --> 765000
-                //              ^^^
-                // But we shouldn't make the number look more precise than it is.
-                exp as usize > width || digits + exp as usize > precision
+            // Power of the most significant digit.
+            let msd = exp + (digits - 1) as ExpInt;
+            if msd >= 0 {
+                // 765e-2 == 7.65
+                false
             } else {
-                // Power of the most significant digit.
-                let msd = exp + (digits - 1) as ExpInt;
-                if msd >= 0 {
-                    // 765e-2 == 7.65
-                    false
-                } else {
-                    // 765e-5 == 0.00765
-                    //           ^ ^^
-                    -msd as usize > width
-                }
+                // 765e-5 == 0.00765
+                //           ^ ^^
+                -msd as usize > width
             }
         };
 
@@ -702,7 +700,7 @@ impl<S: Semantics> Float for IeeeFloat<S> {
         //   exponent = 1..10
         //   significand = 1..1
         IeeeFloat {
-            sig: [!0 & ((1 << S::PRECISION) - 1)],
+            sig: [(1 << S::PRECISION) - 1],
             exp: S::MAX_EXP,
             category: Category::Normal,
             sign: false,
@@ -1507,10 +1505,11 @@ impl<S: Semantics, T: Semantics> FloatConvert<IeeeFloat<T>> for IeeeFloat<S> {
         }
 
         // If this is a truncation, perform the shift.
-        let mut loss = Loss::ExactlyZero;
-        if shift < 0 && (r.is_finite_non_zero() || r.category == Category::NaN) {
-            loss = sig::shift_right(&mut r.sig, &mut 0, -shift as usize);
-        }
+        let loss = if shift < 0 && (r.is_finite_non_zero() || r.category == Category::NaN) {
+            sig::shift_right(&mut r.sig, &mut 0, -shift as usize)
+        } else {
+            Loss::ExactlyZero
+        };
 
         // If this is an extension, perform the shift.
         if shift > 0 && (r.is_finite_non_zero() || r.category == Category::NaN) {
@@ -1738,27 +1737,25 @@ impl<S: Semantics> IeeeFloat<S> {
                 bit_pos -= 4;
                 if bit_pos >= 0 {
                     r.sig[0] |= (hex_value as Limb) << bit_pos;
-                } else {
-                    // If zero or one-half (the hexadecimal digit 8) are followed
-                    // by non-zero, they're a little more than zero or one-half.
-                    if let Some(ref mut loss) = loss {
-                        if hex_value != 0 {
-                            if *loss == Loss::ExactlyZero {
-                                *loss = Loss::LessThanHalf;
-                            }
-                            if *loss == Loss::ExactlyHalf {
-                                *loss = Loss::MoreThanHalf;
-                            }
+                // If zero or one-half (the hexadecimal digit 8) are followed
+                // by non-zero, they're a little more than zero or one-half.
+                } else if let Some(ref mut loss) = loss {
+                    if hex_value != 0 {
+                        if *loss == Loss::ExactlyZero {
+                            *loss = Loss::LessThanHalf;
+                        }
+                        if *loss == Loss::ExactlyHalf {
+                            *loss = Loss::MoreThanHalf;
                         }
-                    } else {
-                        loss = Some(match hex_value {
-                            0 => Loss::ExactlyZero,
-                            1..=7 => Loss::LessThanHalf,
-                            8 => Loss::ExactlyHalf,
-                            9..=15 => Loss::MoreThanHalf,
-                            _ => unreachable!(),
-                        });
                     }
+                } else {
+                    loss = Some(match hex_value {
+                        0 => Loss::ExactlyZero,
+                        1..=7 => Loss::LessThanHalf,
+                        8 => Loss::ExactlyHalf,
+                        9..=15 => Loss::MoreThanHalf,
+                        _ => unreachable!(),
+                    });
                 }
             } else if c == 'p' || c == 'P' {
                 if !any_digits {
@@ -2309,9 +2306,9 @@ mod sig {
 
     /// One, not zero, based LSB. That is, returns 0 for a zeroed significand.
     pub(super) fn olsb(limbs: &[Limb]) -> usize {
-        for i in 0..limbs.len() {
-            if limbs[i] != 0 {
-                return i * LIMB_BITS + limbs[i].trailing_zeros() as usize + 1;
+        for (i, &limb) in limbs.iter().enumerate() {
+            if limb != 0 {
+                return i * LIMB_BITS + limb.trailing_zeros() as usize + 1;
             }
         }
 
@@ -2320,9 +2317,9 @@ mod sig {
 
     /// One, not zero, based MSB. That is, returns 0 for a zeroed significand.
     pub(super) fn omsb(limbs: &[Limb]) -> usize {
-        for i in (0..limbs.len()).rev() {
-            if limbs[i] != 0 {
-                return (i + 1) * LIMB_BITS - limbs[i].leading_zeros() as usize;
+        for (i, &limb) in limbs.iter().enumerate().rev() {
+            if limb != 0 {
+                return (i + 1) * LIMB_BITS - limb.leading_zeros() as usize;
             }
         }
 
@@ -2378,7 +2375,7 @@ mod sig {
                     limb = dst[i - jump];
                     if shift > 0 {
                         limb <<= shift;
-                        if i >= jump + 1 {
+                        if i > jump {
                             limb |= dst[i - jump - 1] >> (LIMB_BITS - shift);
                         }
                     }
@@ -2448,7 +2445,7 @@ mod sig {
         let n = dst_limbs * LIMB_BITS - shift;
         if n < src_bits {
             let mask = (1 << (src_bits - n)) - 1;
-            dst[dst_limbs - 1] |= (src[dst_limbs] & mask) << n % LIMB_BITS;
+            dst[dst_limbs - 1] |= (src[dst_limbs] & mask) << (n % LIMB_BITS);
         } else if n > src_bits && src_bits % LIMB_BITS > 0 {
             dst[dst_limbs - 1] &= (1 << (src_bits % LIMB_BITS)) - 1;
         }

src/librustc_codegen_llvm/back/write.rs

@@ -180,6 +180,8 @@ pub fn target_machine_factory(sess: &Session, find_features: bool)
     let is_pie_binary = !find_features && is_pie_binary(sess);
     let trap_unreachable = sess.target.target.options.trap_unreachable;
 
+    let asm_comments = sess.asm_comments();
+
     Arc::new(move || {
         let tm = unsafe {
             llvm::LLVMRustCreateTargetMachine(
@@ -193,6 +195,7 @@ pub fn target_machine_factory(sess: &Session, find_features: bool)
                 fdata_sections,
                 trap_unreachable,
                 singlethread,
+                asm_comments,
             )
         };
 

src/librustc_codegen_llvm/consts.rs

@@ -230,7 +230,6 @@ pub fn get_static(cx: &CodegenCx<'ll, '_>, def_id: DefId) -> &'ll Value {
     }
 
     cx.instances.borrow_mut().insert(instance, g);
-    cx.statics.borrow_mut().insert(g, def_id);
     g
 }
 

src/librustc_codegen_llvm/context.rs

@@ -13,7 +13,6 @@ use common;
 use llvm;
 use rustc::dep_graph::DepGraphSafe;
 use rustc::hir;
-use rustc::hir::def_id::DefId;
 use debuginfo;
 use callee;
 use base;
@@ -78,9 +77,6 @@ pub struct CodegenCx<'a, 'tcx: 'a> {
     /// Cache of emitted const globals (value -> global)
     pub const_globals: RefCell<FxHashMap<&'a Value, &'a Value>>,
 
-    /// Mapping from static definitions to their DefId's.
-    pub statics: RefCell<FxHashMap<&'a Value, DefId>>,
-
     /// List of globals for static variables which need to be passed to the
     /// LLVM function ReplaceAllUsesWith (RAUW) when codegen is complete.
     /// (We have to make sure we don't invalidate any Values referring
@@ -297,7 +293,6 @@ impl<'a, 'tcx> CodegenCx<'a, 'tcx> {
             const_cstr_cache: RefCell::new(FxHashMap()),
             const_unsized: RefCell::new(FxHashMap()),
             const_globals: RefCell::new(FxHashMap()),
-            statics: RefCell::new(FxHashMap()),
             statics_to_rauw: RefCell::new(Vec::new()),
             used_statics: RefCell::new(Vec::new()),
             lltypes: RefCell::new(FxHashMap()),

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -1455,7 +1455,8 @@ extern "C" {
                                        FunctionSections: bool,
                                        DataSections: bool,
                                        TrapUnreachable: bool,
-                                       Singlethread: bool)
+                                       Singlethread: bool,
+                                       AsmComments: bool)
                                        -> Option<&'static mut TargetMachine>;
     pub fn LLVMRustDisposeTargetMachine(T: &'static mut TargetMachine);
     pub fn LLVMRustAddAnalysisPasses(T: &'a TargetMachine, PM: &PassManager<'a>, M: &'a Module);