[Lightning] [PATCH 1/3] misc: Make jit_note and related functions take a const argument

[Holger Hans Peter Freyther]

From: Holger Hans Peter Freyther <address@hidden>

Make jit_memcpy, jit_memmove, jit_data take const pointers to
allow jit_note to be used with a const string (e.g. a string
literal, __FILE__ or __func__). This is needed for GNU Smalltalk
to silence compiler warnings.

Sadly "const jit_pointer_t" is not the same as "typedef const void *"
so I introduced a new typedef for a const jit pointer. The other
option would be to replace jit_pointer_t with void*.
---
 include/lightning.h             | 5 +++--
 include/lightning/jit_private.h | 4 ++--
 lib/jit_memory.c                | 4 ++--
 lib/jit_note.c                  | 2 +-
 lib/lightning.c                 | 8 ++++----
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/include/lightning.h b/include/lightning.h
index b495af8..ad48af8 100644
--- a/include/lightning.h
+++ b/include/lightning.h
@@ -120,6 +120,7 @@ typedef jit_uint64_t                jit_uword_t;
 typedef float                  jit_float32_t;
 typedef double                 jit_float64_t;
 typedef void*                  jit_pointer_t;
+typedef const void*            jit_const_pointer_t;
 typedef jit_int32_t            jit_bool_t;
 typedef jit_int32_t            jit_gpr_t;
 typedef jit_int32_t            jit_fpr_t;
@@ -856,10 +857,10 @@ extern void _jit_destroy_state(jit_state_t*);
 
 #define jit_address(node)      _jit_address(_jit, node)
 extern jit_pointer_t _jit_address(jit_state_t*, jit_node_t*);
-extern jit_node_t *_jit_data(jit_state_t*, jit_pointer_t,
+extern jit_node_t *_jit_data(jit_state_t*, jit_const_pointer_t,
                             jit_word_t, jit_int32_t);
 extern jit_node_t *_jit_name(jit_state_t*, char*);
-extern jit_node_t *_jit_note(jit_state_t*, char*, int);
+extern jit_node_t *_jit_note(jit_state_t*, const char*, int);
 extern jit_node_t *_jit_label(jit_state_t*);
 extern jit_node_t *_jit_forward(jit_state_t*);
 extern jit_node_t *_jit_indirect(jit_state_t*);
diff --git a/include/lightning/jit_private.h b/include/lightning/jit_private.h
index 128bd1a..a92a69a 100644
--- a/include/lightning/jit_private.h
+++ b/include/lightning/jit_private.h
@@ -611,8 +611,8 @@ extern void _jit_set_note(jit_state_t*, jit_note_t*, char*, 
int, jit_int32_t);
 #define jit_annotate()         _jit_annotate(_jit)
 extern void _jit_annotate(jit_state_t*);
 
-extern jit_pointer_t jit_memcpy(jit_pointer_t,jit_pointer_t,jit_word_t);
-extern jit_pointer_t jit_memmove(jit_pointer_t,jit_pointer_t,jit_word_t);
+extern jit_pointer_t jit_memcpy(jit_pointer_t,jit_const_pointer_t,jit_word_t);
+extern jit_pointer_t jit_memmove(jit_pointer_t,jit_const_pointer_t,jit_word_t);
 extern void jit_alloc(jit_pointer_t*, jit_word_t);
 extern void jit_realloc(jit_pointer_t*, jit_word_t, jit_word_t);
 void jit_free(jit_pointer_t*);
diff --git a/lib/jit_memory.c b/lib/jit_memory.c
index b4193e4..491a42f 100644
--- a/lib/jit_memory.c
+++ b/lib/jit_memory.c
@@ -39,7 +39,7 @@ static jit_free_func_ptr jit_free_ptr = jit_default_free_func;
  * Implementation
  */
 jit_pointer_t
-jit_memcpy(jit_pointer_t dst, jit_pointer_t src, jit_word_t size)
+jit_memcpy(jit_pointer_t dst, jit_const_pointer_t src, jit_word_t size)
 {
     if (size)
        return (memcpy(dst, src, size));
@@ -47,7 +47,7 @@ jit_memcpy(jit_pointer_t dst, jit_pointer_t src, jit_word_t 
size)
 }
 
 jit_pointer_t
-jit_memmove(jit_pointer_t dst, jit_pointer_t src , jit_word_t size)
+jit_memmove(jit_pointer_t dst, jit_const_pointer_t src , jit_word_t size)
 {
     if (size)
        return (memmove(dst, src, size));
diff --git a/lib/jit_note.c b/lib/jit_note.c
index f3d35fa..b8a18ce 100644
--- a/lib/jit_note.c
+++ b/lib/jit_note.c
@@ -70,7 +70,7 @@ _jit_name(jit_state_t *_jit, char *name)
 }
 
 jit_node_t *
-_jit_note(jit_state_t *_jit, char *name, int line)
+_jit_note(jit_state_t *_jit, const char *name, int line)
 {
     jit_node_t         *node;
 
diff --git a/lib/lightning.c b/lib/lightning.c
index 7240f6b..883d652 100644
--- a/lib/lightning.c
+++ b/lib/lightning.c
@@ -44,7 +44,7 @@
 /*
  * Prototypes
  */
-static jit_word_t hash_data(jit_pointer_t, jit_word_t);
+static jit_word_t hash_data(jit_const_pointer_t, jit_word_t);
 
 #define new_pool()                     _new_pool(_jit)
 static void _new_pool(jit_state_t*);
@@ -536,9 +536,9 @@ _jit_load(jit_state_t *_jit, jit_int32_t reg)
 }
 
 static jit_word_t
-hash_data(jit_pointer_t data, jit_word_t length)
+hash_data(jit_const_pointer_t data, jit_word_t length)
 {
-    jit_uint8_t                *ptr;
+    const jit_uint8_t          *ptr;
     jit_word_t          i, key;
     for (i = key = 0, ptr = data; i < length; i++)
        key = (key << (key & 1)) ^ ptr[i];
@@ -558,7 +558,7 @@ _jit_address(jit_state_t *_jit, jit_node_t *node)
 }
 
 jit_node_t *
-_jit_data(jit_state_t *_jit, jit_pointer_t data,
+_jit_data(jit_state_t *_jit, jit_const_pointer_t data,
          jit_word_t length, jit_int32_t align)
 {
     jit_word_t          key;
-- 
2.1.1