69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
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// 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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