Intrinsics for dynamic state instructions

* libguile/intrinsics.c (wind, unwind, push_fluid, pop_fluid)
  (fluid_ref): New intrinsics.
  (scm_bootstrap_intrinsics): Wire them up.
* libguile/intrinsics.h (SCM_FOR_ALL_VM_INTRINSICS): Declare new
  intrinsics.
* libguile/vm-engine.c (wind, unwind, push_fluid, pop_fluid)
  (fluid_ref): Disable these instructions.
* module/language/cps/reify-primitives.scm (compute-known-primitives):
  Add new intrinsics.
* module/system/vm/assembler.scm (wind, unwind, push_fluid, pop_fluid)
  (fluid_ref): Assemble as intrinsics.

libguile/intrinsics.c

@@ -96,6 +96,58 @@ logsub (SCM x, SCM y)
   return scm_logand (x, scm_lognot (y));
 }
 
+static void
+wind (scm_i_thread *thread, SCM winder, SCM unwinder)
+{
+  scm_dynstack_push_dynwind (&thread->dynstack, winder, unwinder);
+}
+
+static void
+unwind (scm_i_thread *thread)
+{
+  scm_dynstack_pop (&thread->dynstack);
+}
+
+static void
+push_fluid (scm_i_thread *thread, SCM fluid, SCM value)
+{
+  scm_dynstack_push_fluid (&thread->dynstack, fluid, value,
+                           thread->dynamic_state);
+}
+
+static void
+pop_fluid (scm_i_thread *thread)
+{
+  scm_dynstack_unwind_fluid (&thread->dynstack, thread->dynamic_state);
+}
+
+static SCM
+fluid_ref (scm_i_thread *thread, SCM fluid)
+{
+  struct scm_cache_entry *entry;
+
+  /* If we find FLUID in the cache, then it is indeed a fluid.  */
+  entry = scm_cache_lookup (&thread->dynamic_state->cache, fluid);
+  if (SCM_LIKELY (scm_is_eq (SCM_PACK (entry->key), fluid)
+                  && !SCM_UNBNDP (SCM_PACK (entry->value))))
+    return SCM_PACK (entry->value);
+
+  return scm_fluid_ref (fluid);
+}
+
+static void
+fluid_set_x (scm_i_thread *thread, SCM fluid, SCM value)
+{
+  struct scm_cache_entry *entry;
+
+  /* If we find FLUID in the cache, then it is indeed a fluid.  */
+  entry = scm_cache_lookup (&thread->dynamic_state->cache, fluid);
+  if (SCM_LIKELY (scm_is_eq (SCM_PACK (entry->key), fluid)))
+    entry->value = SCM_UNPACK (value);
+  else
+    scm_fluid_set_x (fluid, value);
+}
+
 void
 scm_bootstrap_intrinsics (void)
 {
@@ -123,6 +175,12 @@ scm_bootstrap_intrinsics (void)
   scm_vm_intrinsics.u64_to_scm = scm_from_uint64;
   scm_vm_intrinsics.s64_to_scm = scm_from_int64;
   scm_vm_intrinsics.logsub = logsub;
+  scm_vm_intrinsics.wind = wind;
+  scm_vm_intrinsics.unwind = unwind;
+  scm_vm_intrinsics.push_fluid = push_fluid;
+  scm_vm_intrinsics.pop_fluid = pop_fluid;
+  scm_vm_intrinsics.fluid_ref = fluid_ref;
+  scm_vm_intrinsics.fluid_set_x = fluid_set_x;
 
   scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
                             "scm_init_intrinsics",

libguile/intrinsics.h

@@ -61,6 +61,12 @@ typedef SCM (*scm_t_scm_from_thread_scm_intrinsic) (scm_i_thread*, SCM);
   M(scm_from_u64, u64_to_scm, "u64->scm", U64_TO_SCM) \
   M(scm_from_s64, s64_to_scm, "s64->scm", S64_TO_SCM) \
   M(scm_from_scm_scm, logsub, "logsub", LOGSUB) \
+  M(thread_scm_scm, wind, "wind", WIND) \
+  M(thread, unwind, "unwind", UNWIND) \
+  M(thread_scm_scm, push_fluid, "push-fluid", PUSH_FLUID) \
+  M(thread, pop_fluid, "pop-fluid", POP_FLUID) \
+  M(scm_from_thread_scm, fluid_ref, "fluid-ref", FLUID_REF) \
+  M(thread_scm_scm, fluid_set_x, "fluid-set!", FLUID_SET_X) \
   /* Add new intrinsics here; also update scm_bootstrap_intrinsics.  */
 
 enum scm_vm_intrinsic

libguile/vm-engine.c

@@ -1992,15 +1992,7 @@ VM_NAME (scm_i_thread *thread, struct scm_vm *vp,
       NEXT (3);
     }
 
-  /* wind winder:12 unwinder:12
-   *
-   * Push wind and unwind procedures onto the dynamic stack. Note that
-   * neither are actually called; the compiler should emit calls to wind
-   * and unwind for the normal dynamic-wind control flow.  Also note that
-   * the compiler should have inserted checks that they wind and unwind
-   * procs are thunks, if it could not prove that to be the case.
-   */
-  VM_DEFINE_OP (70, wind, "wind", OP1 (X8_S12_S12))
+  VM_DEFINE_OP (70, unused_70, NULL, NOP)
     {
       scm_t_uint16 winder, unwinder;
       UNPACK_12_12 (op, winder, unwinder);
@@ -2010,22 +2002,13 @@ VM_NAME (scm_i_thread *thread, struct scm_vm *vp,
       NEXT (1);
     }
 
-  /* unwind _:24
-   *
-   * A normal exit from the dynamic extent of an expression. Pop the top
-   * entry off of the dynamic stack.
-   */
-  VM_DEFINE_OP (71, unwind, "unwind", OP1 (X32))
+  VM_DEFINE_OP (71, unused_71, NULL, NOP)
     {
       scm_dynstack_pop (&thread->dynstack);
       NEXT (1);
     }
 
-  /* push-fluid fluid:12 value:12
-   *
-   * Dynamically bind VALUE to FLUID.
-   */
-  VM_DEFINE_OP (72, push_fluid, "push-fluid", OP1 (X8_S12_S12))
+  VM_DEFINE_OP (72, unused_72, NULL, NOP)
     {
       scm_t_uint32 fluid, value;
 
@@ -2038,12 +2021,7 @@ VM_NAME (scm_i_thread *thread, struct scm_vm *vp,
       NEXT (1);
     }
 
-  /* pop-fluid _:24
-   *
-   * Leave the dynamic extent of a with-fluid* expression, restoring the
-   * fluid to its previous value.
-   */
-  VM_DEFINE_OP (73, pop_fluid, "pop-fluid", OP1 (X32))
+  VM_DEFINE_OP (73, unused_73, NULL, NOP)
     {
       /* This function must not allocate.  */
       scm_dynstack_unwind_fluid (&thread->dynstack,
@@ -2051,11 +2029,7 @@ VM_NAME (scm_i_thread *thread, struct scm_vm *vp,
       NEXT (1);
     }
 
-  /* fluid-ref dst:12 src:12
-   *
-   * Reference the fluid in SRC, and place the value in DST.
-   */
-  VM_DEFINE_OP (74, fluid_ref, "fluid-ref", OP1 (X8_S12_S12) | OP_DST)
+  VM_DEFINE_OP (74, unused_74, NULL, NOP)
     {
       scm_t_uint16 dst, src;
       SCM fluid;
@@ -2080,11 +2054,7 @@ VM_NAME (scm_i_thread *thread, struct scm_vm *vp,
         }
     }
 
-  /* fluid-set fluid:12 val:12
-   *
-   * Set the value of the fluid in DST to the value in SRC.
-   */
-  VM_DEFINE_OP (75, fluid_set, "fluid-set!", OP1 (X8_S12_S12))
+  VM_DEFINE_OP (75, unused_75, NULL, NOP)
     {
       scm_t_uint16 a, b;
       SCM fluid, value;

module/language/cps/reify-primitives.scm

@@ -235,7 +235,9 @@
       u64->s64 u64->scm scm->u64 scm->u64/truncate
       cache-current-module!
       cached-toplevel-box
-      cached-module-box))
+      cached-module-box
+      wind unwind
+      push-fluid pop-fluid fluid-ref fluid-set!))
   (let ((table (make-hash-table)))
     (for-each
      (match-lambda ((inst . _) (hashq-set! table inst #t)))

module/system/vm/assembler.scm

@@ -212,6 +212,12 @@
             emit-scm->s64
             emit-u64->scm
             emit-s64->scm
+            emit-wind
+            emit-unwind
+            emit-push-fluid
+            emit-pop-fluid
+            emit-fluid-ref
+            emit-fluid-set!
 
             emit-call
             emit-call-label
@@ -238,15 +244,9 @@
             emit-toplevel-box
             emit-module-box
             emit-prompt
-            emit-wind
-            emit-unwind
-            emit-push-fluid
-            emit-pop-fluid
             emit-push-dynamic-state
             emit-pop-dynamic-state
             emit-current-thread
-            emit-fluid-ref
-            emit-fluid-set!
             emit-lsh
             emit-rsh
             emit-lsh/immediate
@@ -1355,6 +1355,12 @@ returned instead."
 (define-s64<-scm-intrinsic scm->s64)
 (define-scm<-u64-intrinsic u64->scm)
 (define-scm<-s64-intrinsic s64->scm)
+(define-thread-scm-scm-intrinsic wind)
+(define-thread-intrinsic unwind)
+(define-thread-scm-scm-intrinsic push-fluid)
+(define-thread-intrinsic pop-fluid)
+(define-scm<-thread-scm-intrinsic fluid-ref)
+(define-thread-scm-scm-intrinsic fluid-set!)
 
 (define-macro-assembler (begin-program asm label properties)
   (emit-label asm label)