base: Remove Rust

src/base/BUILD.gn

@@ -1040,12 +1040,6 @@ component("base") {
   if (!is_nacl) {
     # Used by metrics/crc32, except on NaCl builds.
     deps += [ "//third_party/zlib" ]
-
-    # NaCl does not support Rust.
-    deps += [
-      ":rust_logger",
-      "//third_party/rust/serde_json_lenient/v0_2/wrapper",
-    ]
   }
 
   # `raw_ptr` cannot be made a component due to CRT symbol issues.
@@ -1085,17 +1079,6 @@ component("base") {
   # accidentally (transitively) depend on it anymore.
   public_deps += [ "//build:chromeos_buildflags" ]
 
-  if (!is_nacl) {
-    sources += [
-      "containers/span_rust.h",
-      "strings/string_view_rust.h",
-    ]
-
-    # Base provides conversions between CXX types and base types (e.g.
-    # std::string_view).
-    public_deps += [ "//build/rust:cxx_cppdeps" ]
-  }
-
   # Needed for <atomic> if using newer C++ library than sysroot, except if
   # building inside the cros_sdk environment - use host_toolchain as a
   # more robust check for this.
@@ -1563,8 +1546,6 @@ component("base") {
       "files/scoped_temp_file.h",
       "json/json_file_value_serializer.cc",
       "json/json_file_value_serializer.h",
-      "logging/rust_log_integration.cc",
-      "logging/rust_log_integration.h",
       "memory/discardable_memory.cc",
       "memory/discardable_memory.h",
       "memory/discardable_memory_allocator.cc",
@@ -2497,46 +2478,6 @@ component("base") {
   }
 }
 
-rust_bindgen("logging_log_severity_bindgen") {
-  # TODO(danakj): Maybe combine all base bindgen targets, or all base/logging
-  # ones even) into a single GN target? But the GN rule needs to handle multiple
-  # headers then.
-  header = "logging/log_severity.h"
-  cpp = true
-  visibility = [ ":*" ]
-
-  # Transitive generated header dependency.
-  deps = [ ":debugging_buildflags" ]
-}
-
-rust_static_library("rust_logger") {
-  allow_unsafe = true  # Unsafe needed for FFI.
-  deps = [
-    ":debugging_buildflags",
-    ":logging_log_severity_bindgen",
-    ":tracing_buildflags",
-    "//build:chromeos_buildflags",
-    "//third_party/rust/log/v0_4:lib",
-
-    # Needed because of circular dependency: base depends on this target and by
-    # extension the cxx-generated C++ code, but the cxx-generated code includes
-    # base headers and calls base code. This seems to generally not cause
-    # issues, except for partition_alloc which applies configs when depended on.
-    #
-    # This allows the generated C++ code to transitively include partition alloc
-    # headers without issue.
-    #
-    # TODO(collinbaker): determine how to handle these cxx bindings-induced
-    # circular dependencies more robustly.
-    "//base/allocator/partition_allocator:raw_ptr",
-  ]
-  visibility = [ ":base" ]
-  sources = [ "logging/rust_logger.rs" ]
-  crate_root = "logging/rust_logger.rs"
-
-  cxx_bindings = [ "logging/rust_logger.rs" ]
-}
-
 if (is_linux || is_chromeos) {
   # Split out as a separate target for two reasons:
   # - the line number reader is 2x slower in debug builds if not optimized,

src/base/json/json_reader.cc

@@ -13,7 +13,7 @@
 #include "base/metrics/histogram_macros.h"
 #include "build/build_config.h"
 
-#if !BUILDFLAG(IS_NACL)
+#if 0  // Disables Rust
 #include "base/strings/string_view_rust.h"
 #include "third_party/rust/serde_json_lenient/v0_2/wrapper/functions.h"
 #include "third_party/rust/serde_json_lenient/v0_2/wrapper/lib.rs.h"
@@ -21,7 +21,7 @@
 
 // TODO(crbug.com/40811643): Move the C++ parser into components/nacl to just
 // run in-process there. Don't compile base::JSONReader on NaCL at all.
-#if !BUILDFLAG(IS_NACL)
+#if 0  // Disables Rust
 
 namespace {
 const char kSecurityJsonParsingTime[] = "Security.JSONParser.ParsingTime";
@@ -138,7 +138,7 @@ namespace base {
 std::optional<Value> JSONReader::Read(std::string_view json,
                                       int options,
                                       size_t max_depth) {
-#if BUILDFLAG(IS_NACL)
+#if 1  // Disables Rust
   internal::JSONParser parser(options, max_depth);
   return parser.Parse(json);
 #else   // BUILDFLAG(IS_NACL)
@@ -183,7 +183,7 @@ std::optional<Value::List> JSONReader::ReadList(std::string_view json,
 JSONReader::Result JSONReader::ReadAndReturnValueWithError(
     std::string_view json,
     int options) {
-#if BUILDFLAG(IS_NACL)
+#if 1  // Disables Rust
   internal::JSONParser parser(options);
   auto value = parser.Parse(json);
   if (!value) {
@@ -224,7 +224,7 @@ bool JSONReader::UsingRust() {
   if (!base::FeatureList::GetInstance()) {
     return false;
   }
-#if BUILDFLAG(IS_NACL)
+#if 1  // Disables Rust
   return false;
 #else
   return base::FeatureList::IsEnabled(base::features::kUseRustJsonParser);

src/base/logging.cc

@@ -118,7 +118,7 @@ typedef FILE* FileHandle;
 #include "base/fuchsia/scoped_fx_logger.h"
 #endif
 
-#if !BUILDFLAG(IS_NACL)
+#if 0  // Disables Rust
 #include "base/logging/rust_logger.rs.h"
 #endif
 
@@ -530,7 +530,7 @@ bool BaseInitLoggingImpl(const LoggingSettings& settings) {
   }
 #endif
 
-#if !BUILDFLAG(IS_NACL)
+#if 0  // Disables Rust
   // Connects Rust logging with the //base logging functionality.
   internal::init_rust_log_crate();
 #endif