Index: src/pmc_freeze.c
===================================================================
--- src/pmc_freeze.c	(revision 36986)
+++ src/pmc_freeze.c	(working copy)
@@ -132,13 +132,15 @@
         __attribute__nonnull__(1)
         __attribute__nonnull__(2);
 
-static void push_ascii_integer(PARROT_INTERP, ARGIN(IMAGE_IO *io), INTVAL v)
+static void push_ascii_integer(PARROT_INTERP,
+    ARGIN(IMAGE_IO *io),
+    const INTVAL v)
         __attribute__nonnull__(1)
         __attribute__nonnull__(2);
 
 static void push_ascii_number(PARROT_INTERP,
     ARGIN(const IMAGE_IO *io),
-    FLOATVAL v)
+    const FLOATVAL v)
         __attribute__nonnull__(1)
         __attribute__nonnull__(2);
 
@@ -158,26 +160,26 @@
 
 static void push_opcode_integer(PARROT_INTERP,
     ARGIN(IMAGE_IO *io),
-    INTVAL v)
+    const INTVAL v)
         __attribute__nonnull__(1)
         __attribute__nonnull__(2);
 
 static void push_opcode_number(PARROT_INTERP,
     ARGIN(IMAGE_IO *io),
-    FLOATVAL v)
+    const FLOATVAL v)
         __attribute__nonnull__(1)
         __attribute__nonnull__(2);
 
 static void push_opcode_pmc(PARROT_INTERP,
     ARGIN(IMAGE_IO *io),
-    ARGIN(PMC* v))
+    ARGIN(const PMC* v))
         __attribute__nonnull__(1)
         __attribute__nonnull__(2)
         __attribute__nonnull__(3);
 
 static void push_opcode_string(PARROT_INTERP,
     ARGIN(IMAGE_IO *io),
-    ARGIN(STRING *v))
+    ARGIN(const STRING *v))
         __attribute__nonnull__(1)
         __attribute__nonnull__(2)
         __attribute__nonnull__(3);
@@ -436,7 +438,7 @@
 /* HEADERIZER END: static */
 
 /*
- * define this to 1 for testing. TODO: 1 is broken.
+ * define this to 1 for testing. TODO TT #375: 1 is broken.
  */
 #ifndef FREEZE_ASCII
 #  define FREEZE_ASCII 0
@@ -510,7 +512,7 @@
 */
 
 static void
-push_ascii_integer(PARROT_INTERP, ARGIN(IMAGE_IO *io), INTVAL v)
+push_ascii_integer(PARROT_INTERP, ARGIN(IMAGE_IO *io), const INTVAL v)
 {
     ASSERT_ARGS(push_ascii_integer)
     char buffer[20];
@@ -530,7 +532,7 @@
 */
 
 static void
-push_ascii_number(PARROT_INTERP, ARGIN(const IMAGE_IO *io), FLOATVAL v)
+push_ascii_number(PARROT_INTERP, ARGIN(const IMAGE_IO *io), const FLOATVAL v)
 {
     ASSERT_ARGS(push_ascii_number)
     char buffer[40];
@@ -558,7 +560,7 @@
 {
     ASSERT_ARGS(push_ascii_string)
     const UINTVAL length = Parrot_str_byte_length(interp, s);
-    char * const buffer = (char *)malloc(4*length); /* XXX Why 4?  What does that mean? */
+    char * const buffer = (char *)malloc(OPCODE_T_SIZE*length);
     char *cursor = buffer;
     UINTVAL idx = 0;
 
@@ -777,7 +779,7 @@
 */
 
 static void
-push_opcode_integer(PARROT_INTERP, ARGIN(IMAGE_IO *io), INTVAL v)
+push_opcode_integer(PARROT_INTERP, ARGIN(IMAGE_IO *io), const INTVAL v)
 {
     ASSERT_ARGS(push_opcode_integer)
     PARROT_ASSERT(sizeof (opcode_t) == sizeof (INTVAL));
@@ -795,7 +797,7 @@
 */
 
 static void
-push_opcode_number(PARROT_INTERP, ARGIN(IMAGE_IO *io), FLOATVAL v)
+push_opcode_number(PARROT_INTERP, ARGIN(IMAGE_IO *io), const FLOATVAL v)
 {
     ASSERT_ARGS(push_opcode_number)
     const size_t   len  = PF_size_number() * sizeof (opcode_t);
@@ -822,7 +824,7 @@
 */
 
 static void
-push_opcode_string(PARROT_INTERP, ARGIN(IMAGE_IO *io), ARGIN(STRING *v))
+push_opcode_string(PARROT_INTERP, ARGIN(IMAGE_IO *io), ARGIN(const STRING *v))
 {
     ASSERT_ARGS(push_opcode_string)
     const size_t len = PF_size_string(v) * sizeof (opcode_t);
@@ -849,7 +851,7 @@
 */
 
 static void
-push_opcode_pmc(PARROT_INTERP, ARGIN(IMAGE_IO *io), ARGIN(PMC* v))
+push_opcode_pmc(PARROT_INTERP, ARGIN(IMAGE_IO *io), ARGIN(const PMC* v))
 {
     ASSERT_ARGS(push_opcode_pmc)
     op_append(interp, io->image, (opcode_t)v, sizeof (opcode_t));
Index: include/parrot/pmc_freeze.h
===================================================================
--- include/parrot/pmc_freeze.h	(revision 36906)
+++ include/parrot/pmc_freeze.h	(working copy)
@@ -28,10 +28,10 @@
 
 struct _image_io;
 #define IMAGE_IO struct _image_io
-typedef void (*push_integer_f)       (PARROT_INTERP, IMAGE_IO*, INTVAL);
-typedef void (*push_pmc_f)           (PARROT_INTERP, IMAGE_IO*, PMC*);
-typedef void (*push_string_f)        (PARROT_INTERP, IMAGE_IO*, STRING*);
-typedef void (*push_number_f)        (PARROT_INTERP, IMAGE_IO*, FLOATVAL);
+typedef void (*push_integer_f)       (PARROT_INTERP, IMAGE_IO*, const INTVAL);
+typedef void (*push_pmc_f)           (PARROT_INTERP, IMAGE_IO*, const PMC*);
+typedef void (*push_string_f)        (PARROT_INTERP, IMAGE_IO*, const STRING*);
+typedef void (*push_number_f)        (PARROT_INTERP, IMAGE_IO*, const FLOATVAL);
 typedef INTVAL (*shift_integer_f)      (PARROT_INTERP, IMAGE_IO*);
 typedef PMC*    (*shift_pmc_f)          (PARROT_INTERP, IMAGE_IO*);
 typedef STRING* (*shift_string_f)       (PARROT_INTERP, IMAGE_IO*);