Switch to api.ast.json.gz instead of api.ast.json

build/cc_ast_dump.bzl

@@ -37,7 +37,7 @@ def _cc_ast_dump_impl(ctx):
     inputs = depset(direct = [ctx.file.src], transitive = [cc_toolchain.all_files] + [cc_info.compilation_context.headers])
     env = cc_common.get_environment_variables(feature_configuration = feature_configuration, action_name = CPP_COMPILE_ACTION_NAME, variables = variables)
 
-    command = " ".join([executable] + arguments + [">", ctx.outputs.out.path])
+    command = " ".join([executable] + arguments + ["|", "gzip", "-3", "-", ">", ctx.outputs.out.path])
 
     # run_shell until https://github.com/bazelbuild/bazel/issues/5511 is fixed
     ctx.actions.run_shell(

rust-deps/BUILD.bazel

@@ -108,6 +108,9 @@ crates_vendor(
         "clang-ast": crate.spec(
             version = "0.1",
         ),
+        "flate2": crate.spec(
+            version = "1.0.24",
+        ),
         "serde": crate.spec(
             version = "1.0",
             features = ["default", "derive"],

rust-deps/crates/BUILD.bazel

@@ -57,6 +57,12 @@ alias(
     tags = ["manual"],
 )
 
+alias(
+    name = "flate2",
+    actual = "@crates_vendor__flate2-1.0.24//:flate2",
+    tags = ["manual"],
+)
+
 alias(
     name = "libc",
     actual = "@crates_vendor__libc-0.2.137//:libc",

src/workerd/tools/BUILD.bazel

@@ -89,7 +89,7 @@ filegroup(
 cc_ast_dump(
     name = "dump_api_ast",
     src = api_encoder_src,
-    out = "api.ast.json",
+    out = "api.ast.json.gz",
     deps = [":api_encoder_lib"],
 )
 
@@ -99,6 +99,7 @@ rust_binary(
     deps = [
         "@crates_vendor//:anyhow",
         "@crates_vendor//:clang-ast",
+        "@crates_vendor//:flate2",
         "@crates_vendor//:pico-args",
         "@crates_vendor//:serde",
         "@crates_vendor//:serde_json",

src/workerd/tools/param-extractor.rs

@@ -1,9 +1,12 @@
 use std::{
+    ffi::OsStr,
     fs::File,
     io::{BufReader, BufWriter, Write},
+    path::Path,
 };
 
 use anyhow::Result;
+use flate2::read::GzDecoder;
 use serde::{Deserialize, Serialize};
 
 /// Contains the declarations we care about
@@ -50,10 +53,14 @@ type ClangNode = clang_ast::Node<Clang>;
 fn main() -> Result<()> {
     let mut args = pico_args::Arguments::from_env();
 
-    let clang_ast = args.value_from_os_str("--input", |path| {
+    let clang_ast = args.value_from_os_str("--input", |path_str| {
+        let path = Path::new(path_str);
         let file = File::open(path)?;
-        let rdr = BufReader::new(file);
-        serde_json::from_reader(rdr).map_err(anyhow::Error::from)
+        let serde = match path.extension().and_then(OsStr::to_str) {
+            Some("gz") => serde_json::from_reader(BufReader::new(GzDecoder::new(file))),
+            _ => serde_json::from_reader(BufReader::new(file))
+        };
+        serde.map_err(anyhow::Error::from)
     })?;
 
     let value = get_parameter_names(clang_ast);