rt: Remove unused context functions

Author: brson

src/rt/arch/i386/context.h

@@ -41,20 +41,6 @@ class context {
 
   void swap(context &out);
   void call(void *f, void *arg, void *sp);
-  void call(void *f, void *sp);
-
-  // Note that this doesn't actually adjust esp. Instead, we adjust esp when
-  // we actually do the call. This is needed for exception safety -- if the
-  // function being called causes the task to fail, then we have to avoid
-  // leaking space on the C stack.
-  inline void *alloc_stack(size_t nbytes) {
-    uint32_t bot = regs.esp;
-    uint32_t top = align_down(bot - nbytes);
-
-    (void)VALGRIND_MAKE_MEM_UNDEFINED(top - 4, bot - top + 4);
-
-    return reinterpret_cast<void *>(top);
-  }
 
   void call_shim_on_c_stack(void *args, void *fn_ptr) {
       __morestack(args, fn_ptr, regs.esp);

src/rt/arch/x86_64/context.h

@@ -40,20 +40,6 @@ class context {
 
     void swap(context &out);
     void call(void *f, void *arg, void *sp);
-    void call(void *f, void *sp);
-    
-    // Note that this doesn't actually adjust esp. Instead, we adjust esp when
-    // we actually do the call. This is needed for exception safety -- if the
-    // function being called causes the task to fail, then we have to avoid
-    // leaking space on the C stack.
-    inline void *alloc_stack(size_t nbytes) {
-        uint64_t bot = regs.data[RUSTRT_RSP];
-        uint64_t top = align_down(bot - nbytes);
-
-        (void)VALGRIND_MAKE_MEM_UNDEFINED(top - 4, bot - top + 4);
-
-        return reinterpret_cast<void *>(top);
-    }
 
     void call_shim_on_c_stack(void *args, void *fn_ptr) {
         __morestack(args, fn_ptr, regs.data[RUSTRT_RSP]);