diff --git a/phpunit/src/CallCacheCodegenTest.php b/phpunit/src/CallCacheCodegenTest.php
index 2058c34a..f987fbd0 100644
--- a/phpunit/src/CallCacheCodegenTest.php
+++ b/phpunit/src/CallCacheCodegenTest.php
@@ -43,6 +43,44 @@ public function testDynamicCallSitesUseRequestLocalTypePhpCaches(): void
         self::assertStringContainsString('typephp_get_method_call_cache(MethodCallCacheId cache_id)', $extension);
     }
 
+    public function testSlotAccessorsDeclareNoexceptWithoutChangingResolvingLookups(): void
+    {
+        global $translator;
+        $compiler = CompilerTest::create(TYPEPHP_ROOT_PATH);
+        $translator = $compiler;
+        $compiler->setBuildMode(CompilerBase::BUILD_MODE_EXT);
+        $compiler->setTargetName('noexcept_cache_accessors');
+        $source = TYPEPHP_ROOT_PATH . '/phpunit/code/call-cache-sites.php';
+        $compiler->addFiles([$source]);
+        $compiler->prepareFile($source);
+        $compiler->convertFile($source);
+        $headerFile = tempnam(sys_get_temp_dir(), 'typephp-noexcept-');
+        try {
+            $compiler->genDataDeclarations($headerFile);
+            $header = file_get_contents($headerFile);
+            $extension = file_get_contents($compiler->genExtension());
+            foreach ([
+                'get_property_cache(PropertyCacheId cache_id)',
+                'typephp_get_method_call_cache(MethodCallCacheId cache_id)',
+                'typephp_get_function_call_cache(FunctionCallCacheId cache_id)',
+            ] as $signature) {
+                self::assertStringContainsString($signature . ' noexcept;', $header);
+                self::assertStringContainsString($signature . ' noexcept {', $extension);
+            }
+            // Resolving lookups may throw and must retain that contract.
+            self::assertStringContainsString(
+                'get_persistent_func(PersistentFuncId func_id, const php::Str &func_name);',
+                $header,
+            );
+            self::assertStringContainsString(
+                'get_persistent_func(PersistentFuncId func_id, const php::Str &func_name) {',
+                $extension,
+            );
+        } finally {
+            unlink($headerFile);
+        }
+    }
+
     public function testCallArgumentLimitRejectsBrokenUnboundedLowering(): void
     {
         $compiler = CompilerTest::create(TYPEPHP_ROOT_PATH);
diff --git a/phpunit/src/CompilerBaseApiTest.php b/phpunit/src/CompilerBaseApiTest.php
index e06e64cd..48a1450e 100644
--- a/phpunit/src/CompilerBaseApiTest.php
+++ b/phpunit/src/CompilerBaseApiTest.php
@@ -1499,7 +1499,7 @@ public function testLibraryFunctionHeaderExportsDefaultValueHelpersWithoutLitera
         $this->assertStringContainsString('extern php::Var _const_var_EXPORTED_ABI_STRING;', $dataHeader);
         $this->assertStringContainsString('extern php::Var _const_var_EXPORTED_ABI_ARRAY;', $dataHeader);
         $this->assertStringContainsString(
-            'ZEND_ATTRIBUTE_CONST php::Str &get_str(uint32_t index);',
+            'ZEND_ATTRIBUTE_CONST php::Str &get_str(uint32_t index) noexcept;',
             $dataHeader,
         );
         $this->assertStringNotContainsString('_literal_strings', $dataHeader);
@@ -1510,6 +1510,7 @@ public function testLibraryFunctionHeaderExportsDefaultValueHelpersWithoutLitera
         $extension = file_get_contents($extensionFile);
         $this->assertStringContainsString('php::Str php_exported_defaults_arg_0_default_value() {', $extension);
         $this->assertStringContainsString('static php::Str _literal_strings[]', $extension);
+        $this->assertStringContainsString('php::Str &get_str(uint32_t index) noexcept {', $extension);
         $this->assertStringContainsString('return get_str(', $extension);
         $this->assertStringContainsString('php::Array php_exported_variadic_arg_0_default_value() {', $extension);
     }
diff --git a/src/Translator.php b/src/Translator.php
index b3a465b6..e72f9b65 100644
--- a/src/Translator.php
+++ b/src/Translator.php
@@ -975,7 +975,7 @@ public function genDataDeclarations(string $file): void
 
         if ($this->literalStrings) {
             $lines[] = 'ZEND_ATTRIBUTE_CONST ' . Type::STR . ' &'
-                . self::LITERAL_STRING_GETTER . '(uint32_t index);' . PHP_EOL;
+                . self::LITERAL_STRING_GETTER . '(uint32_t index) noexcept;' . PHP_EOL;
         }
 
         foreach ($this->constants as $name => $constant) {
@@ -1003,9 +1003,9 @@ public function genDataDeclarations(string $file): void
         $lines[] = 'zend_function *get_persistent_func(PersistentFuncId func_id, const php::Str &func_name);';
         $lines[] = 'zend_function *get_persistent_method(PersistentFuncId func_id, const php::Str &method_name, PersistentClassId class_id, const php::Str &class_name);';
         $lines[] = 'uint32_t get_persistent_prop(PersistentPropertyId prop_id, const php::Str &prop_name, const php::Str &class_name);' . PHP_EOL;
-        $lines[] = 'php::PropertyCacheSlot &get_property_cache(PropertyCacheId cache_id);' . PHP_EOL;
-        $lines[] = 'php::MethodCallCacheSlot &typephp_get_method_call_cache(MethodCallCacheId cache_id);' . PHP_EOL;
-        $lines[] = 'php::FunctionCallCacheSlot &typephp_get_function_call_cache(FunctionCallCacheId cache_id);' . PHP_EOL;
+        $lines[] = 'php::PropertyCacheSlot &get_property_cache(PropertyCacheId cache_id) noexcept;' . PHP_EOL;
+        $lines[] = 'php::MethodCallCacheSlot &typephp_get_method_call_cache(MethodCallCacheId cache_id) noexcept;' . PHP_EOL;
+        $lines[] = 'php::FunctionCallCacheSlot &typephp_get_function_call_cache(FunctionCallCacheId cache_id) noexcept;' . PHP_EOL;
 
         foreach ($this->getClassLikesWithConstants() as $classDef) {
             foreach ($classDef->constants as $constant) {
@@ -1275,15 +1275,15 @@ private function doGenExtension(): string
     return value - 1024;
 }
 
-php::PropertyCacheSlot &get_property_cache(PropertyCacheId cache_id) {
+php::PropertyCacheSlot &get_property_cache(PropertyCacheId cache_id) noexcept {
     return php_request_cache->property_cache_map[static_cast<uint32_t>(cache_id)];
 }
 
-php::MethodCallCacheSlot &typephp_get_method_call_cache(MethodCallCacheId cache_id) {
+php::MethodCallCacheSlot &typephp_get_method_call_cache(MethodCallCacheId cache_id) noexcept {
     return php_request_cache->method_call_cache_map[static_cast<uint32_t>(cache_id)];
 }
 
-php::FunctionCallCacheSlot &typephp_get_function_call_cache(FunctionCallCacheId cache_id) {
+php::FunctionCallCacheSlot &typephp_get_function_call_cache(FunctionCallCacheId cache_id) noexcept {
     return php_request_cache->function_call_cache_map[static_cast<uint32_t>(cache_id)];
 }
 CODE;
@@ -1302,7 +1302,7 @@ private function doGenExtension(): string
             }
             $code .= '};' . PHP_EOL . PHP_EOL;
             $code .= 'ZEND_ATTRIBUTE_CONST ' . Type::STR . ' &'
-                . self::LITERAL_STRING_GETTER . '(uint32_t index) {' . PHP_EOL;
+                . self::LITERAL_STRING_GETTER . '(uint32_t index) noexcept {' . PHP_EOL;
             $code .= $this->getIndent() . 'return ' . self::LITERAL_STRINGS . '[index];' . PHP_EOL;
             $code .= '}' . PHP_EOL . PHP_EOL;
         } else {