stage1 caching: zig no longer uses zig-cache

src/compiler.cpp

@@ -0,0 +1,66 @@
+#include "cache_hash.hpp"
+
+#include <stdio.h>
+
+static Buf saved_compiler_id = BUF_INIT;
+static Buf saved_app_data_dir = BUF_INIT;
+static Buf saved_stage1_path = BUF_INIT;
+
+Buf *get_stage1_cache_path() {
+    if (saved_stage1_path.list.length != 0) {
+        return &saved_stage1_path;
+    }
+    Error err;
+    if ((err = os_get_app_data_dir(&saved_app_data_dir, "zig"))) {
+        fprintf(stderr, "Unable to get app data dir: %s\n", err_str(err));
+        exit(1);
+    }
+    os_path_join(&saved_app_data_dir, buf_create_from_str("stage1"), &saved_stage1_path);
+    return &saved_stage1_path;
+}
+
+Error get_compiler_id(Buf **result) {
+    if (saved_compiler_id.list.length != 0) {
+        *result = &saved_compiler_id;
+        return ErrorNone;
+    }
+
+    Error err;
+    Buf *stage1_dir = get_stage1_cache_path();
+    Buf *manifest_dir = buf_alloc();
+    os_path_join(stage1_dir, buf_create_from_str("exe"), manifest_dir);
+
+    CacheHash cache_hash;
+    CacheHash *ch = &cache_hash;
+    cache_init(ch, manifest_dir);
+    Buf self_exe_path = BUF_INIT;
+    if ((err = os_self_exe_path(&self_exe_path)))
+        return err;
+
+    cache_file(ch, &self_exe_path);
+
+    buf_resize(&saved_compiler_id, 0);
+    if ((err = cache_hit(ch, &saved_compiler_id)))
+        return err;
+    if (buf_len(&saved_compiler_id) != 0) {
+        cache_release(ch);
+        *result = &saved_compiler_id;
+        return ErrorNone;
+    }
+    ZigList<Buf *> lib_paths = {};
+    if ((err = os_self_exe_shared_libs(lib_paths)))
+        return err;
+    for (size_t i = 0; i < lib_paths.length; i += 1) {
+        Buf *lib_path = lib_paths.at(i);
+        if ((err = cache_add_file(ch, lib_path)))
+            return err;
+    }
+    if ((err = cache_final(ch, &saved_compiler_id)))
+        return err;
+
+    cache_release(ch);
+
+    *result = &saved_compiler_id;
+    return ErrorNone;
+}
+