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292c5ed168
Some OCaml developers reported that this bit of information is sometimes useful for disambiguating functions for which the OCaml compiler assigns the same name, e.g. nested or inlined functions. Signed-off-by: Fabian Hemmer <copy@copy.sh> Link: http://lore.kernel.org/lkml/20210226075223.p3s5oz4jbxwnqjtv@nyu Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <string.h>
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#include <stdlib.h>
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#include "util/string2.h"
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#include "demangle-ocaml.h"
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#include <linux/ctype.h>
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static const char *caml_prefix = "caml";
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static const size_t caml_prefix_len = 4;
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/* mangled OCaml symbols start with "caml" followed by an upper-case letter */
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static bool
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ocaml_is_mangled(const char *sym)
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{
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return 0 == strncmp(sym, caml_prefix, caml_prefix_len)
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&& isupper(sym[caml_prefix_len]);
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}
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/*
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* input:
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* sym: a symbol which may have been mangled by the OCaml compiler
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* return:
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* if the input doesn't look like a mangled OCaml symbol, NULL is returned
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* otherwise, a newly allocated string containing the demangled symbol is returned
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*/
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char *
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ocaml_demangle_sym(const char *sym)
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{
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char *result;
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int j = 0;
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int i;
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int len;
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if (!ocaml_is_mangled(sym)) {
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return NULL;
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}
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len = strlen(sym);
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/* the demangled symbol is always smaller than the mangled symbol */
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result = malloc(len + 1);
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if (!result)
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return NULL;
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/* skip "caml" prefix */
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i = caml_prefix_len;
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while (i < len) {
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if (sym[i] == '_' && sym[i + 1] == '_') {
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/* "__" -> "." */
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result[j++] = '.';
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i += 2;
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}
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else if (sym[i] == '$' && isxdigit(sym[i + 1]) && isxdigit(sym[i + 2])) {
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/* "$xx" is a hex-encoded character */
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result[j++] = (hex(sym[i + 1]) << 4) | hex(sym[i + 2]);
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i += 3;
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}
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else {
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result[j++] = sym[i++];
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}
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}
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result[j] = '\0';
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return result;
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}
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