Remove dynastack support from runtime

Issue #1982

Author: marijnh

mk/rt.mk

@@ -56,7 +56,6 @@ RUNTIME_CS_$(1) := \
               rt/rust_srv.cpp \
               rt/rust_kernel.cpp \
               rt/rust_shape.cpp \
-              rt/rust_obstack.cpp \
               rt/rust_abi.cpp \
               rt/rust_cc.cpp \
               rt/rust_debug.cpp \
@@ -76,7 +75,6 @@ RUNTIME_HDR_$(1) := rt/globals.h \
                rt/rust_internal.h \
                rt/rust_util.h \
                rt/rust_env.h \
-               rt/rust_obstack.h \
                rt/rust_unwind.h \
                rt/rust_upcall.h \
                rt/rust_port.h \

src/rt/rust_obstack.cpp

@@ -79,7 +79,6 @@ rust_task::rust_task(rust_task_thread *thread, rust_task_list *state,
     boxed(&local_region),
     unwinding(false),
     propagate_failure(true),
-    dynastack(this),
     cc_counter(0),
     total_stack_sz(0),
     state(state),

src/rt/rust_obstack.h

@@ -13,7 +13,6 @@
 #include "rust_debug.h"
 #include "rust_internal.h"
 #include "rust_kernel.h"
-#include "rust_obstack.h"
 #include "boxed_region.h"
 #include "rust_stack.h"
 #include "rust_port_selector.h"
@@ -80,8 +79,6 @@ rust_task : public kernel_owned<rust_task>, rust_cond
 
     bool propagate_failure;
 
-    rust_obstack dynastack;
-
     uint32_t cc_counter;
 
     debug::task_debug_info debug;