mirror of https://github.com/python/cpython
Name mangling, what the heck!
This commit is contained in:
Guido van Rossum
parent
93fccacc84
commit
8ff077b094
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@ -35,6 +35,10 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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XXX other JAR tricks?
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*/
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#ifndef NO_PRIVATE_NAME_MANGLING
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#define PRIVATE_NAME_MANGLING
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#endif
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#include "allobjects.h"
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#include "node.h"
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@ -252,6 +256,9 @@ struct compiling {
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int c_nblocks; /* current block stack level */
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char *c_filename; /* filename of current node */
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char *c_name; /* name of object (e.g. function) */
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#ifdef PRIVATE_NAME_MANGLING
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char *c_private; /* for private name mangling */
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#endif
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};
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@ -304,6 +311,8 @@ static void com_addopname PROTO((struct compiling *, int, node *));
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static void com_list PROTO((struct compiling *, node *, int));
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static int com_argdefs PROTO((struct compiling *, node *));
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static int com_newlocal PROTO((struct compiling *, char *));
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static codeobject *icompile PROTO((struct _node *, struct compiling *));
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static codeobject *jcompile PROTO((struct _node *, char *, struct compiling *));
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static int
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com_init(c, filename)
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@ -489,6 +498,41 @@ com_addname(c, v)
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return com_add(c, c->c_names, v);
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}
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#ifdef PRIVATE_NAME_MANGLING
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static int
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com_mangle(c, name, buffer, maxlen)
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struct compiling *c;
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char *name;
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char *buffer;
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int maxlen;
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{
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/* Name mangling: __private becomes _classname_private.
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This is independent from how the name is used. */
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char *p;
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int nlen, plen;
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nlen = strlen(name);
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if (nlen+1 >= maxlen)
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return 0; /* Don't mangle __extremely_long_names */
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if (name[nlen-1] == '_' && name[nlen-2] == '_')
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return 0; /* Don't mangle __whatever__ */
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p = c->c_private;
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/* Strip leading underscores from class name */
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while (*p == '_')
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p++;
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if (*p == '\0')
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return 0; /* Don't mangle if class is just underscores */
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plen = strlen(p);
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if (plen + nlen >= maxlen)
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plen = maxlen-nlen-1; /* Truncate class name if too long */
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/* buffer = "_" + p[:plen] + name[1:] # i.e. plen+nlen bytes */
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buffer[0] = '_';
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strncpy(buffer+1, p, plen);
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strcpy(buffer+plen+1, name+1);
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/* fprintf(stderr, "mangle %s -> %s\n", name, buffer); */
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return 1;
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}
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#endif
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static void
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com_addopnamestr(c, op, name)
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struct compiling *c;
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@ -497,6 +541,13 @@ com_addopnamestr(c, op, name)
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{
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object *v;
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int i;
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#ifdef PRIVATE_NAME_MANGLING
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char buffer[256];
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if (name != NULL && name[0] == '_' && name[1] == '_' &&
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c->c_private != NULL &&
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com_mangle(c, name, buffer, (int)sizeof(buffer)))
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name = buffer;
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#endif
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if (name == NULL || (v = newstringobject(name)) == NULL) {
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c->c_errors++;
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i = 255;
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@ -1382,7 +1433,7 @@ com_test(c, n)
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object *v;
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int i;
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int ndefs = com_argdefs(c, CHILD(n, 0));
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v = (object *) compile(CHILD(n, 0), c->c_filename);
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v = (object *) icompile(CHILD(n, 0), c);
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if (v == NULL) {
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c->c_errors++;
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i = 255;
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@ -2285,7 +2336,7 @@ com_funcdef(c, n)
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{
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object *v;
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REQ(n, funcdef); /* funcdef: 'def' NAME parameters ':' suite */
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v = (object *)compile(n, c->c_filename);
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v = (object *)icompile(n, c);
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if (v == NULL)
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c->c_errors++;
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else {
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@ -2333,7 +2384,7 @@ com_classdef(c, n)
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com_addoparg(c, BUILD_TUPLE, 0);
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else
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com_bases(c, CHILD(n, 3));
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v = (object *)compile(n, c->c_filename);
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v = (object *)icompile(n, c);
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if (v == NULL)
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c->c_errors++;
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else {
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@ -2706,6 +2757,9 @@ compile_classdef(c, n)
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REQ(n, classdef);
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/* classdef: 'class' NAME ['(' testlist ')'] ':' suite */
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c->c_name = STR(CHILD(n, 1));
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#ifdef PRIVATE_NAME_MANGLING
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c->c_private = c->c_name;
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#endif
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ch = CHILD(n, NCH(n)-1); /* The suite */
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doc = get_docstring(ch);
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if (doc != NULL) {
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@ -2877,11 +2931,34 @@ codeobject *
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compile(n, filename)
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node *n;
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char *filename;
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{
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return jcompile(n, filename, NULL);
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}
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static codeobject *
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icompile(n, base)
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node *n;
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struct compiling *base;
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{
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return jcompile(n, base->c_filename, base);
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}
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static codeobject *
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jcompile(n, filename, base)
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node *n;
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char *filename;
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struct compiling *base;
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{
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struct compiling sc;
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codeobject *co;
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if (!com_init(&sc, filename))
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return NULL;
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#ifdef PRIVATE_NAME_MANGLING
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if (base)
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sc.c_private = base->c_private;
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else
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sc.c_private = NULL;
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#endif
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compile_node(&sc, n);
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com_done(&sc);
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if ((TYPE(n) == funcdef || TYPE(n) == lambdef) && sc.c_errors == 0) {
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