librustc: Remove calls to upcall_reset_stack_limit

Author: pcwalton

src/librustc/back/upcall.rs

@@ -17,20 +17,13 @@ use lib::llvm::{ModuleRef, ValueRef};
 pub struct Upcalls {
     trace: ValueRef,
     rust_personality: ValueRef,
-    reset_stack_limit: ValueRef
 }
 
 macro_rules! upcall (
     (fn $name:ident($($arg:expr),+) -> $ret:expr) => ({
         let fn_ty = Type::func([ $($arg),* ], &$ret);
         base::decl_cdecl_fn(llmod, ~"upcall_" + stringify!($name), fn_ty)
     });
-    (nothrow fn $name:ident($($arg:expr),+) -> $ret:expr) => ({
-        let fn_ty = Type::func([ $($arg),* ], &$ret);
-        let decl = base::decl_cdecl_fn(llmod, ~"upcall_" + stringify!($name), fn_ty);
-        base::set_no_unwind(decl);
-        decl
-    });
     (nothrow fn $name:ident -> $ret:expr) => ({
         let fn_ty = Type::func([], &$ret);
         let decl = base::decl_cdecl_fn(llmod, ~"upcall_" + stringify!($name), fn_ty);
@@ -46,6 +39,5 @@ pub fn declare_upcalls(targ_cfg: @session::config, llmod: ModuleRef) -> @Upcalls
     @Upcalls {
         trace: upcall!(fn trace(opaque_ptr, opaque_ptr, int_ty) -> Type::void()),
         rust_personality: upcall!(nothrow fn rust_personality -> Type::i32()),
-        reset_stack_limit: upcall!(nothrow fn reset_stack_limit -> Type::void())
     }
 }

src/librustc/middle/trans/base.rs

@@ -1012,11 +1012,6 @@ pub fn get_landing_pad(bcx: @mut Block) -> BasicBlockRef {
     // The landing pad block is a cleanup
     SetCleanup(pad_bcx, llretval);
 
-    // Because we may have unwound across a stack boundary, we must call into
-    // the runtime to figure out which stack segment we are on and place the
-    // stack limit back into the TLS.
-    Call(pad_bcx, bcx.ccx().upcalls.reset_stack_limit, [], []);
-
     // We store the retval in a function-central alloca, so that calls to
     // Resume can find it.
     match bcx.fcx.personality {