0.8.21.17:

[sbcl.git] / src / compiler / ppc / vm.lisp

diff --git a/src/compiler/ppc/vm.lisp b/src/compiler/ppc/vm.lisp
index 3f41b89..c52ddfe 100644 (file)
--- a/src/compiler/ppc/vm.lisp
+++ b/src/compiler/ppc/vm.lisp
@@ -1,6 +1,26 @@
-;;;
+;;;; miscellaneous VM definition noise for the PPC
+
+;;;; This software is part of the SBCL system. See the README file for
+;;;; more information.
+;;;;
+;;;; This software is derived from the CMU CL system, which was
+;;;; written at Carnegie Mellon University and released into the
+;;;; public domain. The software is in the public domain and is
+;;;; provided with absolutely no warranty. See the COPYING and CREDITS
+;;;; files for more information.
+
 (in-package "SB!VM")
 
+;;; NUMBER-STACK-DISPLACEMENT
+;;;
+;;; The number of bytes reserved above the number stack pointer.  These
+;;; slots are required by architecture, mostly (?) to make C backtrace
+;;; work. This must be a power of 2 - see BYTES-REQUIRED-FOR-NUMBER-STACK.
+;;; 
+(def!constant number-stack-displacement
+  (* #!-darwin 2
+     #!+darwin 8
+     n-word-bytes))
 \f
 ;;;; Define the registers
 
@@ -98,9 +118,7 @@
       ((null classes)
        (nreverse forms))))
 
-;; XXX this is most likely wrong.  Check with Eric Marsden next time you
-;; see him
-(def!constant sb!vm::kludge-nondeterministic-catch-block-size 7)
+(def!constant kludge-nondeterministic-catch-block-size 7)
 
 (define-storage-classes
 
@@ -123,7 +141,7 @@
   ;; The non-descriptor stacks.
   (signed-stack non-descriptor-stack) ; (signed-byte 32)
   (unsigned-stack non-descriptor-stack) ; (unsigned-byte 32)
-  (base-char-stack non-descriptor-stack) ; non-descriptor characters.
+  (character-stack non-descriptor-stack) ; non-descriptor characters.
   (sap-stack non-descriptor-stack) ; System area pointers.
   (single-stack non-descriptor-stack) ; single-floats
   (double-stack non-descriptor-stack
@@ -151,11 +169,11 @@
    :alternate-scs (control-stack))
 
   ;; Non-Descriptor characters
-  (base-char-reg registers
+  (character-reg registers
    :locations #.non-descriptor-regs
    :constant-scs (immediate)
    :save-p t
-   :alternate-scs (base-char-stack))
+   :alternate-scs (character-stack))
 
   ;; Non-Descriptor SAP's (arbitrary pointers into address space)
   (sap-reg registers
@@ -221,9 +239,7 @@
 
   ;; A catch or unwind block.
   (catch-block control-stack
-               :element-size sb!vm::kludge-nondeterministic-catch-block-size))
-
-
+               :element-size kludge-nondeterministic-catch-block-size))
 \f
 ;;;; Make some random tns for important registers.
 
@@ -256,7 +272,8 @@
      (sc-number-or-lose 'zero))
     (null
      (sc-number-or-lose 'null))
-    ((or fixnum system-area-pointer character)
+    ((or (integer #.sb!xc:most-negative-fixnum #.sb!xc:most-positive-fixnum)
+        system-area-pointer character)
      (sc-number-or-lose 'immediate))
     (symbol
      (if (static-symbol-p value)
@@ -316,11 +333,19 @@
       (immediate-constant "Immed"))))
 \f
 ;;; The loader uses this to convert alien names to the form they
-;;; occur in the symbol table.  This is ELF, so do nothing.
+;;; occur in the symbol table.
 
 (defun extern-alien-name (name)
-  (declare (type simple-base-string name))
-  ;; Darwin is non-ELF, and needs a _ prefix
-  #!+darwin (concatenate 'string "_" name)
-  ;; The other (ELF) ports currently don't need any prefix
-  #!-darwin name)
+  (declare (type string name))
+  ;; Darwin is non-ELF, and needs a _ prefix. The other (ELF) ports
+  ;; currently don't need any prefix.
+  (flet ((maybe-prefix (name)
+            #!+darwin (concatenate 'simple-base-string "_" name)
+            #!-darwin name))
+    (typecase name
+      (simple-base-string (maybe-prefix name))
+      (base-string (coerce (maybe-prefix name) 'simple-base-string))
+      (t
+       (handler-case (coerce (maybe-prefix name) 'simple-base-string)
+        (type-error ()
+          (error "invalid external alien name: ~S" name)))))))