compiler: optimize dwim.

* share/txr/stdlib/asm.tl (op-getf): Rename to op-oldgetf.
This opcode becomes obsolescent.
(op-getf): New opcode.

* share/txr/stdlib/compiler.tl
(assumed-fun): New global variable.
(compiler comp-fun): Use the new getf instruction which takes
a function table index instead of a data table index.
(compiler comp-lisp1-value): Don't use getl1 opcode any more
for dynamic lisp1-style lookup. Instead, we bake the behavior
at compile time perform a function lookup if the symbol is
completely unbound, a variable lookup if it is bound to a
variable (where we decide at compile tie whether it is lexical
or dynamic) or else a function if a function binding exists at
compile time. Also, if we assume that an unbound symbol is a
function, put it on the assumed-fun list.
(compiler comp-dwim): If the first argument is a symbol
with no lexical binding, and is not bound as a variable, then
treat it as a function by transforming the form into a
function call form with that symbol in the car position.
Put the symbol on the assumed-fun list.
(compiler-emit-warnings): New function.
(with-compilation-unit): Call compiler-emit-warnings when
bailing out of most enclosing compilation unit.
(%tlo-ver%): Bump compiled file version to 4, since
we added an opcode.

* vm.c (vm_execute): Follow rename of GETF to OLDGETF.
Implement the new GETF.

* parser.c (read_file_common): Extend version range to allow
version 4 compiled files.

* txr.1: Documented everything.

1 files changed, 4 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index c0a0d505..26d73304 100644
--- a/vm.c
+++ b/vm.c
@@ -991,7 +991,7 @@ NOINLINE static val vm_execute(struct vm *vm)
     case GETV:
       vm_getsym(vm, insn, lookup_var, lit("variable"));
       break;
-    case GETF:
+    case OLDGETF:
       vm_getsym(vm, insn, lookup_fun, lit("function"));
       break;
     case GETL1:
@@ -1024,6 +1024,9 @@ NOINLINE static val vm_execute(struct vm *vm)
     case SETLX:
       vm_settab(vm, insn, lookup_var, lit("variable"));
       break;
+    case GETF:
+      vm_gettab(vm, insn, lookup_fun, lit("function"));
+      break;
     default:
       uw_throwf(error_s, lit("invalid opcode ~s"), num_fast(opcode), nao);
     }