libexpr: use allocBytes() to allocate StringData

src/libcmd/common-eval-args.cc

@@ -168,9 +168,9 @@ Bindings * MixEvalArgs::getAutoArgs(EvalState & state)
                                 ? state.rootPath(absPath(getCommandBaseDir()))
                                 : state.rootPath(".")));
                 },
-                [&](const AutoArgString & arg) { v->mkString(arg.s); },
-                [&](const AutoArgFile & arg) { v->mkString(readFile(arg.path.string())); },
-                [&](const AutoArgStdin & arg) { v->mkString(readFile(STDIN_FILENO)); }},
+                [&](const AutoArgString & arg) { v->mkString(arg.s, state.mem); },
+                [&](const AutoArgFile & arg) { v->mkString(readFile(arg.path.string()), state.mem); },
+                [&](const AutoArgStdin & arg) { v->mkString(readFile(STDIN_FILENO), state.mem); }},
             arg);
         res.insert(state.symbols.create(name), v);
     }

src/libexpr-c/nix_api_value.cc

@@ -497,13 +497,13 @@ nix_err nix_init_bool(nix_c_context * context, nix_value * value, bool b)
 }
 
 // todo string context
-nix_err nix_init_string(nix_c_context * context, nix_value * value, const char * str)
+nix_err nix_init_string(nix_c_context * context, EvalState * s, nix_value * value, const char * str)
 {
     if (context)
         context->last_err_code = NIX_OK;
     try {
         auto & v = check_value_out(value);
-        v.mkString(std::string_view(str));
+        v.mkString(std::string_view(str), s->state.mem);
     }
     NIXC_CATCH_ERRS
 }
@@ -514,7 +514,7 @@ nix_err nix_init_path_string(nix_c_context * context, EvalState * s, nix_value *
         context->last_err_code = NIX_OK;
     try {
         auto & v = check_value_out(value);
-        v.mkPath(s->state.rootPath(nix::CanonPath(str)));
+        v.mkPath(s->state.rootPath(nix::CanonPath(str)), s->state.mem);
     }
     NIXC_CATCH_ERRS
 }

src/libexpr-c/nix_api_value.h

@@ -520,7 +520,7 @@ nix_err nix_init_bool(nix_c_context * context, nix_value * value, bool b);
  * @param[in] str the string, copied
  * @return error code, NIX_OK on success.
  */
-nix_err nix_init_string(nix_c_context * context, nix_value * value, const char * str);
+nix_err nix_init_string(nix_c_context * context, EvalState * s, nix_value * value, const char * str);
 
 /** @brief Set a path
  * @ingroup value_create

src/libexpr-tests/json.cc

@@ -73,7 +73,7 @@ TEST_F(JSONValueTest, StringQuotes)
 TEST_F(JSONValueTest, DISABLED_Path)
 {
     Value v;
-    v.mkPath(state.rootPath(CanonPath("/test")));
+    v.mkPath(state.rootPath(CanonPath("/test")), state.mem);
     ASSERT_EQ(getJSONValue(v), "\"/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x\"");
 }
 } /* namespace nix */

src/libexpr-tests/nix_api_expr.cc

@@ -290,7 +290,7 @@ primop_repeat(void * user_data, nix_c_context * context, EvalState * state, nix_
     for (int i = 0; i < n; ++i)
         result += s;
 
-    nix_init_string(context, ret, result.c_str());
+    nix_init_string(context, state, ret, result.c_str());
 }
 
 TEST_F(nix_api_expr_test, nix_expr_primop_arity_2_multiple_calls)
@@ -305,7 +305,7 @@ TEST_F(nix_api_expr_test, nix_expr_primop_arity_2_multiple_calls)
 
     nix_value * hello = nix_alloc_value(ctx, state);
     assert_ctx_ok();
-    nix_init_string(ctx, hello, "hello");
+    nix_init_string(ctx, state, hello, "hello");
     assert_ctx_ok();
 
     nix_value * three = nix_alloc_value(ctx, state);
@@ -340,7 +340,7 @@ TEST_F(nix_api_expr_test, nix_expr_primop_arity_2_single_call)
 
     nix_value * hello = nix_alloc_value(ctx, state);
     assert_ctx_ok();
-    nix_init_string(ctx, hello, "hello");
+    nix_init_string(ctx, state, hello, "hello");
     assert_ctx_ok();
 
     nix_value * three = nix_alloc_value(ctx, state);

src/libexpr-tests/nix_api_value.cc

@@ -80,7 +80,7 @@ TEST_F(nix_api_expr_test, nix_value_set_get_string)
 {
     std::string string_value;
     const char * myString = "some string";
-    nix_init_string(ctx, value, myString);
+    nix_init_string(ctx, state, value, myString);
 
     nix_get_string(ctx, value, OBSERVE_STRING(string_value));
     ASSERT_STREQ(myString, string_value.c_str());
@@ -306,7 +306,7 @@ TEST_F(nix_api_expr_test, nix_build_and_init_attr)
     nix_init_int(ctx, intValue, 42);
 
     nix_value * stringValue = nix_alloc_value(ctx, state);
-    nix_init_string(ctx, stringValue, "foo");
+    nix_init_string(ctx, state, stringValue, "foo");
 
     nix_bindings_builder_insert(ctx, builder, "a", intValue);
     nix_bindings_builder_insert(ctx, builder, "b", stringValue);
@@ -625,7 +625,7 @@ TEST_F(nix_api_expr_test, nix_value_init)
 TEST_F(nix_api_expr_test, nix_value_init_apply_error)
 {
     nix_value * some_string = nix_alloc_value(ctx, state);
-    nix_init_string(ctx, some_string, "some string");
+    nix_init_string(ctx, state, some_string, "some string");
     assert_ctx_ok();
 
     nix_value * v = nix_alloc_value(ctx, state);

src/libexpr-tests/value/print.cc

@@ -268,7 +268,7 @@ struct StringPrintingTests : LibExprTest
     void test(std::string_view literal, std::string_view expected, unsigned int maxLength, A... args)
     {
         Value v;
-        v.mkString(literal);
+        v.mkString(literal, state.mem);
 
         std::stringstream out;
         printValue(state, out, v, PrintOptions{.maxStringLength = maxLength});
@@ -353,7 +353,7 @@ TEST_F(ValuePrintingTests, ansiColorsStringElided)
 TEST_F(ValuePrintingTests, ansiColorsPath)
 {
     Value v;
-    v.mkPath(state.rootPath(CanonPath("puppy")));
+    v.mkPath(state.rootPath(CanonPath("puppy")), state.mem);
 
     test(v, ANSI_GREEN "/puppy" ANSI_NORMAL, PrintOptions{.ansiColors = true});
 }

src/libexpr/eval.cc

@@ -81,20 +81,20 @@ static const char * makeImmutableString(std::string_view s)
     return t;
 }
 
-StringData & StringData::alloc(size_t size)
+StringData & StringData::alloc(EvalMemory & mem, size_t size)
 {
-    void * t = GC_MALLOC_ATOMIC(sizeof(StringData) + size + 1);
+    void * t = mem.allocBytes(sizeof(StringData) + size + 1);
     if (!t)
         throw std::bad_alloc();
     auto res = new (t) StringData(size);
     return *res;
 }
 
-const StringData & StringData::make(std::string_view s)
+const StringData & StringData::make(EvalMemory & mem, std::string_view s)
 {
     if (s.empty())
         return ""_sds;
-    auto & res = alloc(s.size());
+    auto & res = alloc(mem, s.size());
     std::memcpy(&res.data_, s.data(), s.size());
     res.data_[s.size()] = '\0';
     return res;
@@ -849,9 +849,9 @@ DebugTraceStacker::DebugTraceStacker(EvalState & evalState, DebugTrace t)
         evalState.runDebugRepl(nullptr, trace.env, trace.expr);
 }
 
-void Value::mkString(std::string_view s)
+void Value::mkString(std::string_view s, EvalMemory & mem)
 {
-    mkStringNoCopy(StringData::make(s));
+    mkStringNoCopy(StringData::make(mem, s));
 }
 
 Value::StringWithContext::Context *
@@ -862,23 +862,23 @@ Value::StringWithContext::Context::fromBuilder(const NixStringContext & context,
 
     auto ctx = new (mem.allocBytes(sizeof(Context) + context.size() * sizeof(value_type))) Context(context.size());
     std::ranges::transform(
-        context, ctx->elems, [](const NixStringContextElem & elt) { return &StringData::make(elt.to_string()); });
+        context, ctx->elems, [&](const NixStringContextElem & elt) { return &StringData::make(mem, elt.to_string()); });
     return ctx;
 }
 
 void Value::mkString(std::string_view s, const NixStringContext & context, EvalMemory & mem)
 {
-    mkStringNoCopy(StringData::make(s), Value::StringWithContext::Context::fromBuilder(context, mem));
+    mkStringNoCopy(StringData::make(mem, s), Value::StringWithContext::Context::fromBuilder(context, mem));
 }
 
 void Value::mkStringMove(const StringData & s, const NixStringContext & context, EvalMemory & mem)
 {
     mkStringNoCopy(s, Value::StringWithContext::Context::fromBuilder(context, mem));
 }
 
-void Value::mkPath(const SourcePath & path)
+void Value::mkPath(const SourcePath & path, EvalMemory & mem)
 {
-    mkPath(&*path.accessor, StringData::make(path.path.abs()));
+    mkPath(&*path.accessor, StringData::make(mem, path.path.abs()));
 }
 
 inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
@@ -943,7 +943,7 @@ void EvalState::mkPos(Value & v, PosIdx p)
     auto origin = positions.originOf(p);
     if (auto path = std::get_if<SourcePath>(&origin)) {
         auto attrs = buildBindings(3);
-        attrs.alloc(s.file).mkString(path->path.abs());
+        attrs.alloc(s.file).mkString(path->path.abs(), mem);
         makePositionThunks(*this, p, attrs.alloc(s.line), attrs.alloc(s.column));
         v.mkAttrs(attrs);
     } else
@@ -2139,9 +2139,9 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
         for (const auto & part : strings) {
             resultStr += *part;
         }
-        v.mkPath(state.rootPath(CanonPath(resultStr)));
+        v.mkPath(state.rootPath(CanonPath(resultStr)), state.mem);
     } else {
-        auto & resultStr = StringData::alloc(sSize);
+        auto & resultStr = StringData::alloc(state.mem, sSize);
         auto * tmp = resultStr.data();
         for (const auto & part : strings) {
             std::memcpy(tmp, part->data(), part->size());

src/libexpr/include/nix/expr/value.hh

@@ -232,13 +232,13 @@ public:
      * Allocate StringData on the (possibly) GC-managed heap and copy
      * the contents of s to it.
      */
-    static const StringData & make(std::string_view s);
+    static const StringData & make(EvalMemory & mem, std::string_view s);
 
     /**
      * Allocate StringData on the (possibly) GC-managed heap.
      * @param size Length of the string (without the NUL terminator).
      */
-    static StringData & alloc(size_t size);
+    static StringData & alloc(EvalMemory & mem, size_t size);
 
     size_t size() const
     {
@@ -1147,13 +1147,13 @@ public:
         setStorage(StringWithContext{.str = &s, .context = context});
     }
 
-    void mkString(std::string_view s);
+    void mkString(std::string_view s, EvalMemory & mem);
 
     void mkString(std::string_view s, const NixStringContext & context, EvalMemory & mem);
 
     void mkStringMove(const StringData & s, const NixStringContext & context, EvalMemory & mem);
 
-    void mkPath(const SourcePath & path);
+    void mkPath(const SourcePath & path, EvalMemory & mem);
 
     inline void mkPath(SourceAccessor * accessor, const StringData & path) noexcept
     {

src/libexpr/json-to-value.cc

@@ -151,7 +151,7 @@ class JSONSax : nlohmann::json_sax<json>
     bool string(string_t & val) override
     {
         forceNoNullByte(val);
-        rs->value(state).mkString(val);
+        rs->value(state).mkString(val, state.mem);
         rs->add();
         return true;
     }