Add initial Rust JSG integration with error support

Author: anonrig

build/wd_rust_crate.bzl

@@ -8,7 +8,10 @@ def rust_cxx_bridge(
         deps = [],
         visibility = [],
         strip_include_prefix = None,
-        include_prefix = None):
+        include_prefix = None,
+        tags = [],
+        local_defines = [],
+        features = []):
     native.genrule(
         name = "%s/generated" % name,
         srcs = [src],
@@ -29,12 +32,15 @@ def rust_cxx_bridge(
         hdrs = [src + ".h"] + hdrs,
         strip_include_prefix = strip_include_prefix,
         include_prefix = include_prefix,
+        local_defines = local_defines,
+        features = features,
         linkstatic = select({
             "@platforms//os:windows": True,
             "//conditions:default": False,
         }),
         deps = deps,
         visibility = visibility,
+        tags = tags,
         target_compatible_with = select({
             "@//build/config:no_build": ["@platforms//:incompatible"],
             "//conditions:default": [],
@@ -53,6 +59,9 @@ def wd_rust_crate(
         test_deps = [],
         test_proc_macro_deps = [],
         cxx_bridge_deps = [],
+        cxx_bridge_tags = [],
+        cxx_bridge_local_defines = [],
+        cxx_bridge_features = [],
         visibility = None):
     """Define rust crate.
 
@@ -100,6 +109,9 @@ def wd_rust_crate(
             # Not applying visibility here – if you import the cxxbridge header, you will likely
             # also need the rust library itself to avoid linker errors.
             deps = cxx_bridge_deps,
+            tags = cxx_bridge_tags,
+            local_defines = cxx_bridge_local_defines,
+            features = cxx_bridge_features,
         )
 
     for bridge_src in cxx_bridge_srcs:

compile_flags.txt

@@ -56,13 +56,24 @@
 -isystembazel-bin/src/rust/cxx-integration/_virtual_includes/cxx-include/
 -isystembazel-bin/src/rust/cxx-integration/_virtual_includes/cxx-integration@cxx
 -isystembazel-bin/src/rust/cxx-integration-test/_virtual_includes/cxx-integration-test@cxx
--isystembazel-bin/src/rust/dns/_virtual_includes/dns@cxx
+-isystembazel-bin/src/rust/cxx-integration-test/_virtual_includes/lib.rs@cxx
+-isystembazel-bin/src/rust/kj/_virtual_includes/ffi
 -isystembazel-bin/src/rust/kj/_virtual_includes/http.rs@cxx
 -isystembazel-bin/src/rust/kj/_virtual_includes/io.rs@cxx
 -isystembazel-bin/src/rust/kj/tests/_virtual_includes/lib.rs@cxx
 -isystembazel-bin/src/rust/python-parser/_virtual_includes/python-parser@cxx
 -isystembazel-bin/src/rust/net/_virtual_includes/net@cxx
 -isystembazel-bin/src/rust/transpiler/_virtual_includes/transpiler@cxx
+-isystembazel-bin/src/rust/api/_virtual_includes/lib.rs@cxx
+-isystembazel-bin/src/rust/jsg/_virtual_includes/bridge
+-isystembazel-bin/src/rust/jsg/_virtual_includes/ffi
+-isystembazel-bin/src/rust/jsg/_virtual_includes/lib.rs@cxx
+-isystembazel-bin/src/rust/jsg/_virtual_includes/modules.rs@cxx
+-isystembazel-bin/src/rust/jsg/_virtual_includes/v8.rs@cxx
+-isystembazel-bin/src/rust/jsg-test/_virtual_includes/ffi-hdrs
+-isystembazel-bin/src/rust/jsg-test/_virtual_includes/lib.rs@cxx
+-isystembazel-bin/src/rust/gen-compile-cache/_virtual_includes/cxx-bridge
+-isystembazel-bin/src/rust/gen-compile-cache/_virtual_includes/gen-compile-cache@cxx
 -D_FORTIFY_SOURCE=1
 -D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES
 -D_LIBCPP_NO_ABI_TAG

patches/v8/0014-Add-another-slot-in-the-isolate-for-embedder.patch

@@ -14,7 +14,7 @@ index 9a39f8ede92bad9acf1c390cde2048d7a9eb6a88..efdd0ec674f11a0e68a2e996f6ac0dc6
    static const int kExternalOneByteRepresentationTag = 0x0a;
 
 -  static const uint32_t kNumIsolateDataSlots = 4;
-+  static const uint32_t kNumIsolateDataSlots = 5;
++  static const uint32_t kNumIsolateDataSlots = 6;
    static const int kStackGuardSize = 8 * kApiSystemPointerSize;
    static const int kNumberOfBooleanFlags = 6;
    static const int kErrorMessageParamSize = 1;

src/rust/api/BUILD.bazel

@@ -0,0 +1,16 @@
+load("//:build/wd_rust_crate.bzl", "wd_rust_crate")
+
+wd_rust_crate(
+    name = "api",
+    cxx_bridge_deps = ["//src/rust/jsg"],
+    cxx_bridge_srcs = ["lib.rs"],
+    proc_macro_deps = [
+        "//src/rust/jsg-macros",
+    ],
+    test_deps = ["//src/rust/jsg-test"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//src/rust/jsg",
+        "@crates_vendor//:thiserror",
+    ],
+)