From d0bbc1460756466acb45bf0d8f8a61e0f59b1d56 Mon Sep 17 00:00:00 2001
From: Nathan Memmott <memmott@chromium.org>
Date: Wed, 17 Jun 2026 11:53:17 -0700
Subject: [PATCH 4/7] Disable exceptions in darts.h under
 DARTS_DISABLE_EXCEPTIONS

---
 .../src/third_party/darts_clone/darts.h       | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/third_party/sentencepiece/src/third_party/darts_clone/darts.h b/third_party/sentencepiece/src/third_party/darts_clone/darts.h
index aeb5115662c41..fad75422bd280 100644
--- a/third_party/sentencepiece/src/third_party/darts_clone/darts.h
+++ b/third_party/sentencepiece/src/third_party/darts_clone/darts.h
@@ -6,6 +6,10 @@
 #include <exception>
 #include <new>
 
+#if DARTS_DISABLE_EXCEPTIONS
+#include "absl/log/absl_check.h"
+#endif
+
 #define DARTS_VERSION "0.32"
 
 // DARTS_THROW() throws a <Darts::Exception> whose message starts with the
@@ -16,8 +20,12 @@
 #define DARTS_INT_TO_STR(value) #value
 #define DARTS_LINE_TO_STR(line) DARTS_INT_TO_STR(line)
 #define DARTS_LINE_STR DARTS_LINE_TO_STR(__LINE__)
+#if DARTS_DISABLE_EXCEPTIONS
+#define DARTS_THROW(msg) ABSL_CHECK(false) << (msg)
+#else
 #define DARTS_THROW(msg) throw Darts::Details::Exception( \
   __FILE__ ":" DARTS_LINE_STR ": exception: " msg)
+#endif
 
 namespace Darts {
 
@@ -387,15 +395,19 @@ int DoubleArrayImpl<A, B, T, C>::open(const char *file_name,
   }
 
   unit_type *buf;
+#if !DARTS_DISABLE_EXCEPTIONS
   try {
+#endif
     buf = new unit_type[size];
     for (id_type i = 0; i < 256; ++i) {
       buf[i] = units[i];
     }
+#if !DARTS_DISABLE_EXCEPTIONS
   } catch (const std::bad_alloc &) {
     std::fclose(file);
     DARTS_THROW("failed to open double-array: std::bad_alloc");
   }
+#endif
 
   if (size > 256) {
     if (std::fread(buf + 256, unit_size(), size - 256, file) != size - 256) {
@@ -731,11 +743,15 @@ void AutoPool<T>::resize_buf(std::size_t size) {
   }
 
   AutoArray<char> buf;
+#if !DARTS_DISABLE_EXCEPTIONS
   try {
+#endif
     buf.reset(new char[sizeof(T) * capacity]);
+#if !DARTS_DISABLE_EXCEPTIONS
   } catch (const std::bad_alloc &) {
     DARTS_THROW("failed to resize pool: std::bad_alloc");
   }
+#endif
 
   if (size_ > 0) {
     T *src = reinterpret_cast<T *>(&buf_[0]);
@@ -870,11 +886,15 @@ class BitVector {
 };
 
 inline void BitVector::build() {
+#if !DARTS_DISABLE_EXCEPTIONS
   try {
+#endif
     ranks_.reset(new id_type[units_.size()]);
+#if !DARTS_DISABLE_EXCEPTIONS
   } catch (const std::bad_alloc &) {
     DARTS_THROW("failed to build rank index: std::bad_alloc");
   }
+#endif
 
   num_ones_ = 0;
   for (std::size_t i = 0; i < units_.size(); ++i) {
-- 
2.54.0.1189.g8c84645362-goog