src/blastradius/proto/blastradius.proto

// Copyright (c) 2026, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
syntax = "proto3";

package com.android.tools.r8.blastradius.proto;

// Don't put all messages under the outer class.
option java_multiple_files = true;

// Camel-case the outer class name (default is `Blastradius`).
option java_outer_classname = "KeepRuleBlastRadiusProtos";

// Java package consistent with R8 convention.
option java_package = "com.android.tools.r8.blastradius.proto";

// Information about a single keep rule and its immediate blast radius.
message KeepRuleBlastRadius {
  int32 id = 1;
  // Textual representation of the keep rule.
  string source = 2;
  // What this keep rule prohibits (e.g., optimization).
  // Id into KeepConstraints.
  int32 constraints_id = 3;
  // Where this rule comes from.
  TextFileOrigin origin = 4;
  // Blast radius information.
  BlastRadius blast_radius = 5;
  // Keep rule tags.
  repeated KeepRuleTag tags = 6;
}

enum KeepRuleTag {
  PACKAGE_WIDE = 0;
}

message BlastRadius {
  // Which rules subsume this rule. Note: This information could in principle
  // be computed offline using the kept_by info of Kept*Info.
  // Ids into KeepAnnotationBlastRadius and KeepRuleBlastRadius.
  repeated int32 subsumed_by = 1;
  // The immediate blast radius of this rule.
  // - Ids into KeptClassInfo.
  repeated int32 class_blast_radius = 2;
  // - Ids into KeptFieldInfo.
  repeated int32 field_blast_radius = 3;
  // - Ids into KeptMethodInfo.
  repeated int32 method_blast_radius = 4;
}

// The ids of GlobalKeepRuleBlastRadius and KeepRuleBlastRadius are
// non-overlapping by design, so that a single int32 id can be used to
// unambiguously reference a GlobalKeepRuleBlastRadius or KeepRuleBlastRadius.
message GlobalKeepRuleBlastRadius {
  int32 id = 1;
  // Textual representation of the keep rule.
  string source = 2;
  // Where this rule comes from.
  TextFileOrigin origin = 3;
}

// Information about the constraints of a single keep annotation or rule,
// i.e., what is prohibited by it.
//
// This is encoded as a message to support keep constraints that cannot be
// encoded as a bit in the future.
message KeepConstraints {
  int32 id = 1;
  repeated KeepConstraint constraints = 2;
}

enum KeepConstraint {
  DONT_OBFUSCATE = 0;
  DONT_OPTIMIZE = 1;
  DONT_SHRINK = 2;
}

// Information about a class in the app/library and which keep rules that
// keep it.
message KeptClassInfo {
  int32 id = 1;
  // Id into TypeReference.
  int32 class_reference_id = 2;
  // Id into FileOrigin or ClassFileInJarOrigin.
  int32 file_origin_id = 3;
  // Ids into KeepRuleBlastRadius, telling which rules keep this class.
  // Allows reasoning about properties such as:
  // - Which keep rules are fully subsumed by other keep rules?
  // - Which keep rules keep the most classes/fields/methods
  //   not kept by rules?
  repeated int32 kept_by = 4;
}

message KeptFieldInfo {
  int32 id = 1;
  // Id into FieldReference.
  int32 field_reference_id = 2;
  // Id into FileOrigin or ClassFileInJarOrigin.
  int32 file_origin_id = 3;
  // Ids into KeepRuleBlastRadius, telling which rules keep this field.
  repeated int32 kept_by = 4;
}

message KeptMethodInfo {
  int32 id = 1;
  // Id into MethodReference.
  int32 method_reference_id = 2;
  // Id into FileOrigin or ClassFileInJarOrigin.
  int32 file_origin_id = 3;
  // Ids into KeepRuleBlastRadius, telling which rules keep this method.
  repeated int32 kept_by = 4;
}

// References:

message FieldReference {
  int32 id = 1;
  // The class on which the field is declared.
  // Id into TypeReference.
  int32 class_reference_id = 2;
  // The type of the field.
  // Id into type reference.
  int32 type_reference_id = 3;
  // The name of the field.
  string name = 4;
}

message MethodReference {
  int32 id = 1;
  // The class on which the method is declared.
  // Id into TypeReference.
  int32 class_reference_id = 2;
  // The proto (return type, parameter types) of the method.
  // Id into ProtoReference.
  int32 proto_reference_id = 3;
  // The name of the method.
  string name = 4;
}

message ProtoReference {
  int32 id = 1;
  // Id into TypeReferenceList.
  int32 parameters_id = 2;
  // Id into TypeReference.
  int32 return_type_id = 3;
}

message TypeReference {
  int32 id = 1;
  // The descriptor, e.g.,
  // - Z
  // - Ljava/lang/Object;
  // - [[Ljava/lang/Object;
  string java_descriptor = 2;
}

message TypeReferenceList {
  int32 id = 1;
  repeated int32 type_reference_ids = 2;
}

// Origins:

message FileOrigin {
  int32 id = 1;
  string filename = 2;
  MavenCoordinate maven_coordinate = 3;
  bool provided_by_build_system = 4;
}

// The ids of ClassFileInJarOrigin and FileOrigin are non-overlapping
// by design, so that a single int32 id can be used to
// unambiguously reference a ClassFileInJarOrigin or FileOrigin.
message ClassFileInJarOrigin {
  int32 id = 1;
  int32 file_origin_id = 2;
  string entry = 3;
}

// Intentionally doesn't declare an id since each keep rule has its own
// TextFileOrigin, i.e., there is no sharing of TextFileOrigin.
message TextFileOrigin {
  // Id into FileOrigin
  int32 file_origin_id = 1;
  int32 line_number = 2;
  int32 column_number = 3;
}

message MavenCoordinate {
  int32 id = 1;
  string group_id = 2;
  string artifact_id = 3;
  string version = 4;
}

message BuildInfo {
  int32 class_count = 1;
  int32 field_count = 2;
  int32 method_count = 3;
  int32 live_class_count = 4;
  int32 live_field_count = 5;
  int32 live_method_count = 6;
}

// Container.

message BlastRadiusContainer {
  // Origins.
  repeated FileOrigin file_origin_table = 1;
  repeated ClassFileInJarOrigin class_file_in_jar_origin_table = 2;
  repeated MavenCoordinate maven_coordinate_table = 3;

  // References.
  repeated FieldReference field_reference_table = 4;
  repeated MethodReference method_reference_table = 5;
  repeated ProtoReference proto_reference_table = 6;
  repeated TypeReference type_reference_table = 7;
  repeated TypeReferenceList type_reference_list_table = 8;

  // Kept items.
  repeated KeptClassInfo kept_class_info_table = 9;
  repeated KeptFieldInfo kept_field_info_table = 10;
  repeated KeptMethodInfo kept_method_info_table = 11;

  // Keep specifications.
  repeated KeepConstraints keep_constraints_table = 12;
  repeated KeepRuleBlastRadius keep_rule_blast_radius_table = 13;
  repeated GlobalKeepRuleBlastRadius global_keep_rule_blast_radius_table = 14;

  // Build info.
  BuildInfo build_info = 15;
}