debuggng for PR31361

base/strings/string_number_conversions_dup.cc

+#include <string>
+#include <vector>
+#include <stdint.h>
+
+namespace hack {
+
+bool CharToDigit(char c, uint8_t* digit) {
+  if (c >= '0' && c <= '9') {
+    *digit = c - '0';
+  } else if (c >= 'a' && c < 'a' + 16 - 10) {
+    *digit = c - 'a' + 10;
+  } else if (c >= 'A' && c < 'A' + 16 - 10) {
+    *digit = c - 'A' + 10;
+  } else {
+    return false;
+  }
+  return true;
+}
+
+bool HexStringToBytes(const std::string& input, std::vector<uint8_t>* output) {
+  size_t count = input.size();
+  if (count == 0 || (count % 2) != 0)
+    return false;
+  for (uintptr_t i = 0; i < count / 2; ++i) {
+    uint8_t msb = 0;  // most significant 4 bits
+    uint8_t lsb = 0;  // least significant 4 bits
+    if (!CharToDigit(input[i * 2], &msb) ||
+        !CharToDigit(input[i * 2 + 1], &lsb))
+      return false;
+    output->push_back((msb << 4) | lsb);
+  }
+  return true;
+}
+
+void f() {
+  // Make sure we have 1MB of code, so that the string accesses above have to
+  // use adrp instead of adr.
+  __asm__(".zero 1048576");
+}
+
+}