upload android base code part6

android/system/core/demangle/demangle.cpp

@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <cctype>
+#include <string>
+
+#include <demangle.h>
+
+extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
+
+static void Usage(const char* prog_name) {
+  printf("usage: %s [-c] [NAME_TO_DEMANGLE...]\n", prog_name);
+  printf("\n");
+  printf("Demangles C++ mangled names if supplied on the command-line, or found\n");
+  printf("reading from stdin otherwise.\n");
+  printf("\n");
+  printf("-c\tCompare against __cxa_demangle\n");
+  printf("\n");
+}
+
+static std::string DemangleWithCxa(const char* name) {
+  const char* cxa_demangle = __cxa_demangle(name, nullptr, nullptr, nullptr);
+  if (cxa_demangle == nullptr) {
+    return name;
+  }
+
+  // The format of our demangler is slightly different from the cxa demangler
+  // so modify the cxa demangler output. Specifically, for templates, remove
+  // the spaces between '>' and '>'.
+  std::string demangled_str;
+  for (size_t i = 0; i < strlen(cxa_demangle); i++) {
+    if (i > 2 && cxa_demangle[i] == '>' && std::isspace(cxa_demangle[i - 1]) &&
+        cxa_demangle[i - 2] == '>') {
+      demangled_str.resize(demangled_str.size() - 1);
+    }
+    demangled_str += cxa_demangle[i];
+  }
+  return demangled_str;
+}
+
+static void Compare(const char* name, const std::string& demangled_name) {
+  std::string cxa_demangled_name(DemangleWithCxa(name));
+  if (cxa_demangled_name != demangled_name) {
+    printf("\nMismatch!\n");
+    printf("\tmangled name: %s\n", name);
+    printf("\tour demangle: %s\n", demangled_name.c_str());
+    printf("\tcxa demangle: %s\n", cxa_demangled_name.c_str());
+    exit(1);
+  }
+}
+
+static int Filter(bool compare) {
+  char* line = nullptr;
+  size_t line_length = 0;
+
+  while ((getline(&line, &line_length, stdin)) != -1) {
+    char* p = line;
+    char* name;
+    while ((name = strstr(p, "_Z")) != nullptr) {
+      // Output anything before the identifier.
+      *name = 0;
+      printf("%s", p);
+      *name = '_';
+
+      // Extract the identifier.
+      p = name;
+      while (*p && (std::isalnum(*p) || *p == '_' || *p == '.' || *p == '$')) ++p;
+
+      // Demangle and output.
+      std::string identifier(name, p);
+      std::string demangled_name = demangle(identifier.c_str());
+      printf("%s", demangled_name.c_str());
+
+      if (compare) Compare(identifier.c_str(), demangled_name);
+    }
+    // Output anything after the last identifier.
+    printf("%s", p);
+  }
+
+  free(line);
+  return 0;
+}
+
+int main(int argc, char** argv) {
+#ifdef __BIONIC__
+  const char* prog_name = getprogname();
+#else
+  const char* prog_name = argv[0];
+#endif
+
+  bool compare = false;
+  int opt_char;
+  while ((opt_char = getopt(argc, argv, "c")) != -1) {
+    if (opt_char == 'c') {
+      compare = true;
+    } else {
+      Usage(prog_name);
+      return 1;
+    }
+  }
+
+  // With no arguments, act as a filter.
+  if (optind == argc) return Filter(compare);
+
+  // Otherwise demangle each argument.
+  while (optind < argc) {
+    const char* name = argv[optind++];
+    std::string demangled_name = demangle(name);
+    printf("%s\n", demangled_name.c_str());
+
+    if (compare) Compare(name, demangled_name);
+  }
+  return 0;
+}