ec57db083f
This new SVH is used to uniquely identify all crates as a snapshot in time of their ABI/API/publicly reachable state. This current calculation is just a hash of the entire crate's AST. This is obviously incorrect, but it is currently the reality for today. This change threads through the new Svh structure which originates from crate dependencies. The concept of crate id hash is preserved to provide efficient matching on filenames for crate loading. The inspected hash once crate metadata is opened has been changed to use the new Svh. The goal of this hash is to identify when upstream crates have changed but downstream crates have not been recompiled. This will prevent the def-id drift problem where upstream crates were recompiled, thereby changing their metadata, but downstream crates were not recompiled. In the future this hash can be expanded to exclude contents of the AST like doc comments, but limitations in the compiler prevent this change from being made at this time. Closes #10207
216 lines
6.3 KiB
Rust
216 lines
6.3 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#[allow(non_camel_case_types)];
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use std::cast;
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use syntax::crateid::CrateId;
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use back::svh::Svh;
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// EBML enum definitions and utils shared by the encoder and decoder
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pub static tag_items: uint = 0x00;
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pub static tag_paths_data_name: uint = 0x01;
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pub static tag_def_id: uint = 0x02;
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pub static tag_items_data: uint = 0x03;
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pub static tag_items_data_item: uint = 0x04;
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pub static tag_items_data_item_family: uint = 0x05;
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pub static tag_items_data_item_ty_param_bounds: uint = 0x06;
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pub static tag_items_data_item_type: uint = 0x07;
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pub static tag_items_data_item_symbol: uint = 0x08;
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pub static tag_items_data_item_variant: uint = 0x09;
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pub static tag_items_data_parent_item: uint = 0x0a;
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pub static tag_items_data_item_is_tuple_struct_ctor: uint = 0x0b;
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pub static tag_index: uint = 0x0c;
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pub static tag_index_buckets: uint = 0x0d;
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pub static tag_index_buckets_bucket: uint = 0x0e;
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pub static tag_index_buckets_bucket_elt: uint = 0x0f;
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pub static tag_index_table: uint = 0x10;
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pub static tag_meta_item_name_value: uint = 0x11;
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pub static tag_meta_item_name: uint = 0x12;
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pub static tag_meta_item_value: uint = 0x13;
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pub static tag_attributes: uint = 0x14;
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pub static tag_attribute: uint = 0x15;
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pub static tag_meta_item_word: uint = 0x16;
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pub static tag_meta_item_list: uint = 0x17;
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// The list of crates that this crate depends on
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pub static tag_crate_deps: uint = 0x18;
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// A single crate dependency
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pub static tag_crate_dep: uint = 0x19;
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pub static tag_crate_hash: uint = 0x1a;
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pub static tag_crate_crateid: uint = 0x1b;
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pub static tag_parent_item: uint = 0x1c;
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pub static tag_crate_dep_crateid: uint = 0x1d;
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pub static tag_crate_dep_hash: uint = 0x1e;
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pub static tag_mod_impl: uint = 0x1f;
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pub static tag_item_trait_method: uint = 0x20;
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pub static tag_item_trait_ref: uint = 0x21;
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pub static tag_item_super_trait_ref: uint = 0x22;
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// discriminator value for variants
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pub static tag_disr_val: uint = 0x23;
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// used to encode ast_map::PathElem
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pub static tag_path: uint = 0x24;
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pub static tag_path_len: uint = 0x25;
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pub static tag_path_elem_mod: uint = 0x26;
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pub static tag_path_elem_name: uint = 0x27;
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pub static tag_item_field: uint = 0x28;
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pub static tag_struct_mut: uint = 0x29;
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pub static tag_item_variances: uint = 0x2a;
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pub static tag_mod_impl_trait: uint = 0x2b;
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/*
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trait items contain tag_item_trait_method elements,
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impl items contain tag_item_impl_method elements, and classes
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have both. That's because some code treats classes like traits,
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and other code treats them like impls. Because classes can contain
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both, tag_item_trait_method and tag_item_impl_method have to be two
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different tags.
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*/
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pub static tag_item_impl_method: uint = 0x2c;
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pub static tag_item_trait_method_explicit_self: uint = 0x2d;
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pub static tag_item_trait_method_self_ty_region: uint = 0x2e;
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// Reexports are found within module tags. Each reexport contains def_ids
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// and names.
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pub static tag_items_data_item_reexport: uint = 0x2f;
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pub static tag_items_data_item_reexport_def_id: uint = 0x30;
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pub static tag_items_data_item_reexport_name: uint = 0x31;
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// used to encode crate_ctxt side tables
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#[deriving(Eq)]
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#[repr(uint)]
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pub enum astencode_tag { // Reserves 0x32 -- 0x45
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tag_ast = 0x32,
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tag_tree = 0x33,
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tag_id_range = 0x34,
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tag_table = 0x35,
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tag_table_id = 0x36,
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tag_table_val = 0x37,
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tag_table_def = 0x38,
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tag_table_node_type = 0x39,
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tag_table_node_type_subst = 0x3a,
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tag_table_freevars = 0x3b,
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tag_table_tcache = 0x3c,
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tag_table_param_defs = 0x3d,
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tag_table_mutbl = 0x3e,
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tag_table_last_use = 0x3f,
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tag_table_spill = 0x40,
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tag_table_method_map = 0x41,
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tag_table_vtable_map = 0x42,
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tag_table_adjustments = 0x43,
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tag_table_moves_map = 0x44,
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tag_table_capture_map = 0x45
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}
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static first_astencode_tag: uint = tag_ast as uint;
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static last_astencode_tag: uint = tag_table_capture_map as uint;
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impl astencode_tag {
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pub fn from_uint(value : uint) -> Option<astencode_tag> {
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let is_a_tag = first_astencode_tag <= value && value <= last_astencode_tag;
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if !is_a_tag { None } else {
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Some(unsafe { cast::transmute(value) })
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}
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}
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}
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pub static tag_item_trait_method_sort: uint = 0x46;
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pub static tag_item_impl_type_basename: uint = 0x47;
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// Language items are a top-level directory (for speed). Hierarchy:
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//
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// tag_lang_items
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// - tag_lang_items_item
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// - tag_lang_items_item_id: u32
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// - tag_lang_items_item_node_id: u32
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pub static tag_lang_items: uint = 0x48;
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pub static tag_lang_items_item: uint = 0x49;
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pub static tag_lang_items_item_id: uint = 0x4a;
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pub static tag_lang_items_item_node_id: uint = 0x4b;
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pub static tag_item_unnamed_field: uint = 0x4c;
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pub static tag_items_data_item_struct_ctor: uint = 0x4d;
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pub static tag_items_data_item_visibility: uint = 0x4e;
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pub static tag_link_args: uint = 0x4f;
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pub static tag_link_args_arg: uint = 0x50;
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pub static tag_item_method_tps: uint = 0x51;
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pub static tag_item_method_fty: uint = 0x52;
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pub static tag_mod_child: uint = 0x53;
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pub static tag_misc_info: uint = 0x54;
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pub static tag_misc_info_crate_items: uint = 0x55;
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pub static tag_item_method_provided_source: uint = 0x56;
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pub static tag_item_impl_vtables: uint = 0x57;
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pub static tag_impls: uint = 0x58;
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pub static tag_impls_impl: uint = 0x59;
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pub static tag_items_data_item_inherent_impl: uint = 0x5a;
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pub static tag_items_data_item_extension_impl: uint = 0x5b;
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pub static tag_region_param_def: uint = 0x5c;
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pub static tag_region_param_def_ident: uint = 0x5d;
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pub static tag_region_param_def_def_id: uint = 0x5e;
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pub static tag_native_libraries: uint = 0x5f;
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pub static tag_native_libraries_lib: uint = 0x60;
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pub static tag_native_libraries_name: uint = 0x61;
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pub static tag_native_libraries_kind: uint = 0x62;
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pub static tag_macro_registrar_fn: uint = 0x63;
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pub static tag_exported_macros: uint = 0x64;
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pub static tag_macro_def: uint = 0x65;
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#[deriving(Clone, Show)]
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pub struct LinkMeta {
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crateid: CrateId,
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crate_hash: Svh,
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}
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