add a panic-strategy field to the target specification

Now a target can define its panic strategy in its specification. If a
user doesn't specify a panic strategy via the command line, i.e. '-C
panic', then the compiler will use the panic strategy defined by the
target specification.

Custom targets can pick their panic strategy via the "panic-strategy"
field of their target specification JSON file. If omitted in the
specification, the strategy defaults to "unwind".

closes #36647

src/librustc/middle/cstore.rs

@@ -32,7 +32,6 @@ use ty::{self, Ty, TyCtxt};
 use mir::repr::Mir;
 use mir::mir_map::MirMap;
 use session::Session;
-use session::config::PanicStrategy;
 use session::search_paths::PathKind;
 use util::nodemap::{NodeSet, DefIdMap};
 use std::path::PathBuf;
@@ -45,6 +44,7 @@ use syntax_pos::Span;
 use rustc_back::target::Target;
 use hir;
 use hir::intravisit::Visitor;
+use rustc_back::PanicStrategy;
 
 pub use self::NativeLibraryKind::{NativeStatic, NativeFramework, NativeUnknown};
 

src/librustc/middle/dependency_format.rs

@@ -64,9 +64,10 @@
 use hir::def_id::CrateNum;
 
 use session;
-use session::config::{self, PanicStrategy};
+use session::config;
 use middle::cstore::LinkagePreference::{self, RequireStatic, RequireDynamic};
 use util::nodemap::FnvHashMap;
+use rustc_back::PanicStrategy;
 
 /// A list of dependencies for a certain crate type.
 ///
@@ -357,7 +358,7 @@ fn verify_ok(sess: &session::Session, list: &[Linkage]) {
     // only one, but we perform validation here that all the panic strategy
     // compilation modes for the whole DAG are valid.
     if let Some((cnum, found_strategy)) = panic_runtime {
-        let desired_strategy = sess.opts.cg.panic.clone();
+        let desired_strategy = sess.panic_strategy();
 
         // First up, validate that our selected panic runtime is indeed exactly
         // our same strategy.

src/librustc/middle/weak_lang_items.rs

@@ -10,10 +10,11 @@
 
 //! Validity checking for weak lang items
 
-use session::config::{self, PanicStrategy};
+use session::config;
 use session::Session;
 use middle::lang_items;
 
+use rustc_back::PanicStrategy;
 use syntax::ast;
 use syntax::parse::token::InternedString;
 use syntax_pos::Span;
@@ -92,7 +93,7 @@ fn verify(sess: &Session, items: &lang_items::LanguageItems) {
     // symbols. Other panic runtimes ensure that the relevant symbols are
     // available to link things together, but they're never exercised.
     let mut whitelisted = HashSet::new();
-    if sess.opts.cg.panic != PanicStrategy::Unwind {
+    if sess.panic_strategy() != PanicStrategy::Unwind {
         whitelisted.insert(lang_items::EhPersonalityLangItem);
         whitelisted.insert(lang_items::EhUnwindResumeLangItem);
     }

src/librustc/session/config.rs

@@ -19,6 +19,7 @@ pub use self::DebugInfoLevel::*;
 use session::{early_error, early_warn, Session};
 use session::search_paths::SearchPaths;
 
+use rustc_back::PanicStrategy;
 use rustc_back::target::Target;
 use lint;
 use middle::cstore;
@@ -493,21 +494,6 @@ impl Passes {
     }
 }
 
-#[derive(Clone, PartialEq, Hash, RustcEncodable, RustcDecodable)]
-pub enum PanicStrategy {
-    Unwind,
-    Abort,
-}
-
-impl PanicStrategy {
-    pub fn desc(&self) -> &str {
-        match *self {
-            PanicStrategy::Unwind => "unwind",
-            PanicStrategy::Abort => "abort",
-        }
-    }
-}
-
 /// Declare a macro that will define all CodegenOptions/DebuggingOptions fields and parsers all
 /// at once. The goal of this macro is to define an interface that can be
 /// programmatically used by the option parser in order to initialize the struct
@@ -620,7 +606,8 @@ macro_rules! options {
 
     #[allow(dead_code)]
     mod $mod_set {
-        use super::{$struct_name, Passes, SomePasses, AllPasses, PanicStrategy};
+        use super::{$struct_name, Passes, SomePasses, AllPasses};
+        use rustc_back::PanicStrategy;
 
         $(
             pub fn $opt(cg: &mut $struct_name, v: Option<&str>) -> bool {
@@ -725,10 +712,10 @@ macro_rules! options {
             }
         }
 
-        fn parse_panic_strategy(slot: &mut PanicStrategy, v: Option<&str>) -> bool {
+        fn parse_panic_strategy(slot: &mut Option<PanicStrategy>, v: Option<&str>) -> bool {
             match v {
-                Some("unwind") => *slot = PanicStrategy::Unwind,
-                Some("abort") => *slot = PanicStrategy::Abort,
+                Some("unwind") => *slot = Some(PanicStrategy::Unwind),
+                Some("abort") => *slot = Some(PanicStrategy::Abort),
                 _ => return false
             }
             true
@@ -800,7 +787,7 @@ options! {CodegenOptions, CodegenSetter, basic_codegen_options,
         "explicitly enable the cfg(debug_assertions) directive"),
     inline_threshold: Option<usize> = (None, parse_opt_uint, [TRACKED],
         "set the inlining threshold for"),
-    panic: PanicStrategy = (PanicStrategy::Unwind, parse_panic_strategy,
+    panic: Option<PanicStrategy> = (None, parse_panic_strategy,
         [TRACKED], "panic strategy to compile crate with"),
 }
 
@@ -1676,9 +1663,10 @@ mod dep_tracking {
     use std::collections::BTreeMap;
     use std::hash::{Hash, SipHasher};
     use std::path::PathBuf;
-    use super::{Passes, PanicStrategy, CrateType, OptLevel, DebugInfoLevel,
+    use super::{Passes, CrateType, OptLevel, DebugInfoLevel,
                 OutputTypes, Externs, ErrorOutputType};
     use syntax::feature_gate::UnstableFeatures;
+    use rustc_back::PanicStrategy;
 
     pub trait DepTrackingHash {
         fn hash(&self, &mut SipHasher, ErrorOutputType);
@@ -1717,6 +1705,7 @@ mod dep_tracking {
     impl_dep_tracking_hash_via_hash!(Option<bool>);
     impl_dep_tracking_hash_via_hash!(Option<usize>);
     impl_dep_tracking_hash_via_hash!(Option<String>);
+    impl_dep_tracking_hash_via_hash!(Option<PanicStrategy>);
     impl_dep_tracking_hash_via_hash!(Option<lint::Level>);
     impl_dep_tracking_hash_via_hash!(Option<PathBuf>);
     impl_dep_tracking_hash_via_hash!(CrateType);
@@ -1783,7 +1772,8 @@ mod tests {
     use std::iter::FromIterator;
     use std::path::PathBuf;
     use std::rc::Rc;
-    use super::{OutputType, OutputTypes, Externs, PanicStrategy};
+    use super::{OutputType, OutputTypes, Externs};
+    use rustc_back::PanicStrategy;
     use syntax::{ast, attr};
     use syntax::parse::token::InternedString;
     use syntax::codemap::dummy_spanned;

src/librustc/session/mod.rs

@@ -15,7 +15,7 @@ use lint;
 use middle::cstore::CrateStore;
 use middle::dependency_format;
 use session::search_paths::PathKind;
-use session::config::{DebugInfoLevel, PanicStrategy};
+use session::config::DebugInfoLevel;
 use ty::tls;
 use util::nodemap::{NodeMap, FnvHashMap};
 use util::common::duration_to_secs_str;
@@ -33,6 +33,7 @@ use syntax::{ast, codemap};
 use syntax::feature_gate::AttributeType;
 use syntax_pos::{Span, MultiSpan};
 
+use rustc_back::PanicStrategy;
 use rustc_back::target::Target;
 use rustc_data_structures::flock;
 use llvm;
@@ -306,9 +307,13 @@ impl Session {
     pub fn lto(&self) -> bool {
         self.opts.cg.lto
     }
+    /// Returns the panic strategy for this compile session. If the user explicitly selected one
+    /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
+    pub fn panic_strategy(&self) -> PanicStrategy {
+        self.opts.cg.panic.unwrap_or(self.target.target.options.panic_strategy)
+    }
     pub fn no_landing_pads(&self) -> bool {
-        self.opts.debugging_opts.no_landing_pads ||
-            self.opts.cg.panic == PanicStrategy::Abort
+        self.opts.debugging_opts.no_landing_pads || self.panic_strategy() == PanicStrategy::Abort
     }
     pub fn unstable_options(&self) -> bool {
         self.opts.debugging_opts.unstable_options