Merge pull request #98 from max-schaefer/extract-frontend-errors

Add support for extracting frontend errors
This commit is contained in:
Sauyon Lee
2020-04-15 01:40:31 -07:00
committed by GitHub
9 changed files with 1878 additions and 71 deletions

View File

@@ -4,6 +4,7 @@ import (
"go/ast"
"go/token"
gotypes "go/types"
"golang.org/x/tools/go/packages"
)
var defaultSnippet = AddDefaultSnippet(`
@@ -642,6 +643,20 @@ var ModLParenType = ModExprKind.NewBranch("@modlparen")
// ModRParenType is the type of go.mod line block end AST nodes
var ModRParenType = ModExprKind.NewBranch("@modrparen")
// ErrorType is the type of frontend errors
var ErrorType = NewPrimaryKeyType("@error")
// ErrorKind is a case type for distinguishing different kinds of frontend errors
var ErrorKind = NewCaseType(ErrorType, "kind")
// ErrorTypes is a map from error kinds to the corresponding type
var ErrorTypes = map[packages.ErrorKind]*BranchType{
packages.UnknownError: ErrorKind.NewBranch("@unknownerror"),
packages.ListError: ErrorKind.NewBranch("@listerror"),
packages.ParseError: ErrorKind.NewBranch("@parseerror"),
packages.TypeError: ErrorKind.NewBranch("@typeerror"),
}
// LocationsDefaultTable is the table defining location objects
var LocationsDefaultTable = NewTable("locations_default",
EntityColumn(LocationDefaultType, "id").Key(),
@@ -915,3 +930,16 @@ var ModTokensTable = NewTable("modtokens",
EntityColumn(ModExprType, "parent"),
IntColumn("idx"),
).KeySet("parent", "idx")
// ErrorsTable is the table describing frontend errors
var ErrorsTable = NewTable("errors",
EntityColumn(ErrorType, "id").Key(),
IntColumn("kind"),
StringColumn("msg"),
StringColumn("rawpos"),
StringColumn("file"),
IntColumn("line"),
IntColumn("col"),
EntityColumn(PackageType, "package"),
IntColumn("idx"),
).KeySet("package", "idx")

View File

@@ -57,13 +57,6 @@ func ExtractWithFlags(buildFlags []string, patterns []string) error {
packages.Visit(pkgs, func(pkg *packages.Package) bool {
return true
}, func(pkg *packages.Package) {
if len(pkg.Errors) != 0 {
log.Printf("Warning: encountered errors extracting package `%s`:", pkg.PkgPath)
for _, err := range pkg.Errors {
log.Printf(" %s", err.Error())
}
}
tw, err := trap.NewWriter(pkg.PkgPath, pkg)
if err != nil {
log.Fatal(err)
@@ -74,6 +67,14 @@ func ExtractWithFlags(buildFlags []string, patterns []string) error {
tw.ForEachObject(extractObjectType)
lbl := tw.Labeler.GlobalID(pkg.PkgPath + ";pkg")
dbscheme.PackagesTable.Emit(tw, lbl, pkg.Name, pkg.PkgPath, scope)
if len(pkg.Errors) != 0 {
log.Printf("Warning: encountered errors extracting package `%s`:", pkg.PkgPath)
for i, err := range pkg.Errors {
log.Printf(" %s", err.Error())
extractError(tw, err, lbl, i)
}
}
})
// this sets the number of threads that the Go runtime will spawn; this is separate
@@ -253,6 +254,43 @@ func extractObjectType(tw *trap.Writer, obj types.Object, lbl trap.Label) {
}
}
// extractError extracts the message and location of a frontend error
func extractError(tw *trap.Writer, err packages.Error, pkglbl trap.Label, idx int) {
var (
lbl = tw.Labeler.FreshID()
kind = dbscheme.ErrorTypes[err.Kind].Index()
pos = err.Pos
posComponents = strings.Split(err.Pos, ":")
file = ""
line = 0
col = 0
e error
)
switch len(posComponents) {
case 3:
// "file:line:col"
col, e = strconv.Atoi(posComponents[2])
if e != nil {
log.Printf("Warning: malformed column number `%s`: %v", posComponents[2], e)
}
fallthrough
case 2:
// "file:line"
file = posComponents[0]
line, e = strconv.Atoi(posComponents[1])
if e != nil {
log.Printf("Warning: malformed line number `%s`: %v", posComponents[1], e)
}
default:
// "", "-"
if pos != "" && pos != "-" {
log.Printf("Warning: malformed error position `%s`", pos)
}
}
file = filepath.ToSlash(srcarchive.TransformPath(file))
dbscheme.ErrorsTable.Emit(tw, lbl, kind, err.Msg, pos, file, line, col, pkglbl, idx)
}
// extractPackage extracts AST information for all files in the given package
func extractPackage(pkg *packages.Package, wg *sync.WaitGroup,
goroutineSem *semaphore, fdSem *semaphore) {

View File

@@ -124,6 +124,10 @@ modexprs(unique int id: @modexpr, int kind: int ref, int parent: @modexprparent
#keyset[parent, idx]
modtokens(string token: string ref, int parent: @modexpr ref, int idx: int ref);
#keyset[package, idx]
errors(unique int id: @error, int kind: int ref, string msg: string ref, string rawpos: string ref,
string file: string ref, int line: int ref, int col: int ref, int package: @package ref, int idx: int ref);
@container = @file | @folder;
@locatable = @node | @localscope;
@@ -418,3 +422,9 @@ case @modexpr.kind of
| 3 = @modlparen
| 4 = @modrparen;
case @error.kind of
0 = @unknownerror
| 1 = @listerror
| 2 = @parseerror
| 3 = @typeerror;

File diff suppressed because it is too large Load Diff

View File

@@ -7,6 +7,7 @@ import semmle.go.AST
import semmle.go.Comments
import semmle.go.Concepts
import semmle.go.Decls
import semmle.go.Errors
import semmle.go.Expr
import semmle.go.Files
import semmle.go.GoMod

View File

@@ -0,0 +1,50 @@
/** Provides classes for working with Go frontend errors recorded during extraction. */
import go
/**
* An error reported by the Go frontend during extraction.
*/
class Error extends @error {
/** Gets the message associated with this error. */
string getMessage() { errors(this, _, result, _, _, _, _, _, _) }
/** Gets the raw position reported by the frontend for this error. */
string getRawPosition() { errors(this, _, _, result, _, _, _, _, _) }
/** Gets the package in which this error was reported. */
Package getPackage() { errors(this, _, _, _, _, _, _, result, _) }
/** Gets the index of this error among all errors reported for the same package. */
int getIndex() { errors(this, _, _, _, _, _, _, _, result) }
/**
* Holds if this element is at the specified location.
* The location spans column `startcolumn` of line `startline` to
* column `endcolumn` of line `endline` in file `filepath`.
* For more information, see
* [LGTM locations](https://lgtm.com/help/ql/locations).
*/
predicate hasLocationInfo(
string filepath, int startline, int startcolumn, int endline, int endcolumn
) {
errors(this, _, _, _, filepath, startline, startcolumn, _, _) and
endline = startline and
endcolumn = startcolumn
}
/** Gets a textual representation of this error. */
string toString() { result = getMessage() }
}
/** An error reported by an unknown part of the Go frontend. */
class UnknownError extends Error, @unknownerror { }
/** An error reported by the Go frontend driver. */
class ListError extends Error, @listerror { }
/** An error reported by the Go parser. */
class ParseError extends Error, @parseerror { }
/** An error reported by the Go type checker. */
class TypeError extends Error, @typeerror { }

View File

@@ -0,0 +1,430 @@
/** Auto-generated dbscheme; do not edit. */
/** Duplicate code **/
duplicateCode(
unique int id : @duplication,
varchar(900) relativePath : string ref,
int equivClass : int ref);
similarCode(
unique int id : @similarity,
varchar(900) relativePath : string ref,
int equivClass : int ref);
@duplication_or_similarity = @duplication | @similarity;
tokens(
int id : @duplication_or_similarity ref,
int offset : int ref,
int beginLine : int ref,
int beginColumn : int ref,
int endLine : int ref,
int endColumn : int ref);
/** External data **/
externalData(
int id : @externalDataElement,
varchar(900) path : string ref,
int column: int ref,
varchar(900) value : string ref
);
snapshotDate(unique date snapshotDate : date ref);
sourceLocationPrefix(varchar(900) prefix : string ref);
locations_default(unique int id: @location_default, int file: @file ref, int beginLine: int ref, int beginColumn: int ref,
int endLine: int ref, int endColumn: int ref);
numlines(int element_id: @sourceline ref, int num_lines: int ref, int num_code: int ref, int num_comment: int ref);
files(unique int id: @file, string name: string ref, string simple: string ref, string ext: string ref, int fromSource: int ref);
folders(unique int id: @folder, string name: string ref, string simple: string ref);
containerparent(int parent: @container ref, unique int child: @container ref);
has_location(unique int locatable: @locatable ref, int location: @location ref);
comment_groups(unique int id: @comment_group);
comments(unique int id: @comment, int kind: int ref, int parent: @comment_group ref, int idx: int ref, string text: string ref);
doc_comments(unique int node: @documentable ref, int comment: @comment_group ref);
#keyset[parent, idx]
exprs(unique int id: @expr, int kind: int ref, int parent: @exprparent ref, int idx: int ref);
literals(unique int expr: @expr ref, string value: string ref, string raw: string ref);
constvalues(unique int expr: @expr ref, string value: string ref, string exact: string ref);
fields(unique int id: @field, int parent: @fieldparent ref, int idx: int ref);
#keyset[parent, idx]
stmts(unique int id: @stmt, int kind: int ref, int parent: @stmtparent ref, int idx: int ref);
#keyset[parent, idx]
decls(unique int id: @decl, int kind: int ref, int parent: @declparent ref, int idx: int ref);
#keyset[parent, idx]
specs(unique int id: @spec, int kind: int ref, int parent: @gendecl ref, int idx: int ref);
scopes(unique int id: @scope, int kind: int ref);
scopenesting(unique int inner: @scope ref, int outer: @scope ref);
scopenodes(unique int node: @scopenode ref, int scope: @localscope ref);
objects(unique int id: @object, int kind: int ref, string name: string ref);
objectscopes(unique int object: @object ref, int scope: @scope ref);
objecttypes(unique int object: @object ref, int tp: @type ref);
methodreceivers(unique int method: @object ref, int receiver: @object ref);
fieldstructs(unique int field: @object ref, int struct: @structtype ref);
methodhosts(int method: @object ref, int host: @namedtype ref);
defs(int ident: @ident ref, int object: @object ref);
uses(int ident: @ident ref, int object: @object ref);
types(unique int id: @type, int kind: int ref);
type_of(unique int expr: @expr ref, int tp: @type ref);
typename(unique int tp: @type ref, string name: string ref);
key_type(unique int map: @maptype ref, int tp: @type ref);
element_type(unique int container: @containertype ref, int tp: @type ref);
base_type(unique int ptr: @pointertype ref, int tp: @type ref);
underlying_type(unique int named: @namedtype ref, int tp: @type ref);
#keyset[parent, index]
component_types(int parent: @compositetype ref, int index: int ref, string name: string ref, int tp: @type ref);
array_length(unique int tp: @arraytype ref, string len: string ref);
type_objects(unique int tp: @type ref, int object: @object ref);
packages(unique int id: @package, string name: string ref, string path: string ref, int scope: @packagescope ref);
#keyset[parent, idx]
modexprs(unique int id: @modexpr, int kind: int ref, int parent: @modexprparent ref, int idx: int ref);
#keyset[parent, idx]
modtokens(string token: string ref, int parent: @modexpr ref, int idx: int ref);
#keyset[package, idx]
errors(unique int id: @error, int kind: int ref, string msg: string ref, string rawpos: string ref,
string file: string ref, int line: int ref, int col: int ref, int package: @package ref, int idx: int ref);
@container = @file | @folder;
@locatable = @node | @localscope;
@node = @documentable | @exprparent | @modexprparent | @fieldparent | @stmtparent | @declparent | @scopenode
| @comment_group | @comment;
@documentable = @file | @field | @spec | @gendecl | @funcdecl | @modexpr;
@exprparent = @funcdef | @file | @expr | @field | @stmt | @decl | @spec;
@modexprparent = @file | @modexpr;
@fieldparent = @decl | @structtypeexpr | @functypeexpr | @interfacetypeexpr;
@stmtparent = @funcdef | @stmt | @decl;
@declparent = @file | @declstmt;
@funcdef = @funclit | @funcdecl;
@scopenode = @file | @functypeexpr | @blockstmt | @ifstmt | @caseclause | @switchstmt | @commclause | @loopstmt;
@location = @location_default;
@sourceline = @locatable;
case @comment.kind of
0 = @slashslashcomment
| 1 = @slashstarcomment;
case @expr.kind of
0 = @badexpr
| 1 = @ident
| 2 = @ellipsis
| 3 = @intlit
| 4 = @floatlit
| 5 = @imaglit
| 6 = @charlit
| 7 = @stringlit
| 8 = @funclit
| 9 = @compositelit
| 10 = @parenexpr
| 11 = @selectorexpr
| 12 = @indexexpr
| 13 = @sliceexpr
| 14 = @typeassertexpr
| 15 = @callorconversionexpr
| 16 = @starexpr
| 17 = @keyvalueexpr
| 18 = @arraytypeexpr
| 19 = @structtypeexpr
| 20 = @functypeexpr
| 21 = @interfacetypeexpr
| 22 = @maptypeexpr
| 23 = @plusexpr
| 24 = @minusexpr
| 25 = @notexpr
| 26 = @complementexpr
| 27 = @derefexpr
| 28 = @addressexpr
| 29 = @arrowexpr
| 30 = @lorexpr
| 31 = @landexpr
| 32 = @eqlexpr
| 33 = @neqexpr
| 34 = @lssexpr
| 35 = @leqexpr
| 36 = @gtrexpr
| 37 = @geqexpr
| 38 = @addexpr
| 39 = @subexpr
| 40 = @orexpr
| 41 = @xorexpr
| 42 = @mulexpr
| 43 = @quoexpr
| 44 = @remexpr
| 45 = @shlexpr
| 46 = @shrexpr
| 47 = @andexpr
| 48 = @andnotexpr
| 49 = @sendchantypeexpr
| 50 = @recvchantypeexpr
| 51 = @sendrcvchantypeexpr;
@basiclit = @intlit | @floatlit | @imaglit | @charlit | @stringlit;
@operatorexpr = @logicalexpr | @arithmeticexpr | @bitwiseexpr | @unaryexpr | @binaryexpr;
@logicalexpr = @logicalunaryexpr | @logicalbinaryexpr;
@arithmeticexpr = @arithmeticunaryexpr | @arithmeticbinaryexpr;
@bitwiseexpr = @bitwiseunaryexpr | @bitwisebinaryexpr;
@unaryexpr = @logicalunaryexpr | @bitwiseunaryexpr | @arithmeticunaryexpr | @derefexpr | @addressexpr | @arrowexpr;
@logicalunaryexpr = @notexpr;
@bitwiseunaryexpr = @complementexpr;
@arithmeticunaryexpr = @plusexpr | @minusexpr;
@binaryexpr = @logicalbinaryexpr | @bitwisebinaryexpr | @arithmeticbinaryexpr | @comparison;
@logicalbinaryexpr = @lorexpr | @landexpr;
@bitwisebinaryexpr = @shiftexpr | @orexpr | @xorexpr | @andexpr | @andnotexpr;
@arithmeticbinaryexpr = @addexpr | @subexpr | @mulexpr | @quoexpr | @remexpr;
@shiftexpr = @shlexpr | @shrexpr;
@comparison = @equalitytest | @relationalcomparison;
@equalitytest = @eqlexpr | @neqexpr;
@relationalcomparison = @lssexpr | @leqexpr | @gtrexpr | @geqexpr;
@chantypeexpr = @sendchantypeexpr | @recvchantypeexpr | @sendrcvchantypeexpr;
case @stmt.kind of
0 = @badstmt
| 1 = @declstmt
| 2 = @emptystmt
| 3 = @labeledstmt
| 4 = @exprstmt
| 5 = @sendstmt
| 6 = @incstmt
| 7 = @decstmt
| 8 = @gostmt
| 9 = @deferstmt
| 10 = @returnstmt
| 11 = @breakstmt
| 12 = @continuestmt
| 13 = @gotostmt
| 14 = @fallthroughstmt
| 15 = @blockstmt
| 16 = @ifstmt
| 17 = @caseclause
| 18 = @exprswitchstmt
| 19 = @typeswitchstmt
| 20 = @commclause
| 21 = @selectstmt
| 22 = @forstmt
| 23 = @rangestmt
| 24 = @assignstmt
| 25 = @definestmt
| 26 = @addassignstmt
| 27 = @subassignstmt
| 28 = @mulassignstmt
| 29 = @quoassignstmt
| 30 = @remassignstmt
| 31 = @andassignstmt
| 32 = @orassignstmt
| 33 = @xorassignstmt
| 34 = @shlassignstmt
| 35 = @shrassignstmt
| 36 = @andnotassignstmt;
@incdecstmt = @incstmt | @decstmt;
@assignment = @simpleassignstmt | @compoundassignstmt;
@simpleassignstmt = @assignstmt | @definestmt;
@compoundassignstmt = @addassignstmt | @subassignstmt | @mulassignstmt | @quoassignstmt | @remassignstmt
| @andassignstmt | @orassignstmt | @xorassignstmt | @shlassignstmt | @shrassignstmt | @andnotassignstmt;
@branchstmt = @breakstmt | @continuestmt | @gotostmt | @fallthroughstmt;
@switchstmt = @exprswitchstmt | @typeswitchstmt;
@loopstmt = @forstmt | @rangestmt;
case @decl.kind of
0 = @baddecl
| 1 = @importdecl
| 2 = @constdecl
| 3 = @typedecl
| 4 = @vardecl
| 5 = @funcdecl;
@gendecl = @importdecl | @constdecl | @typedecl | @vardecl;
case @spec.kind of
0 = @importspec
| 1 = @valuespec
| 2 = @typespec;
case @object.kind of
0 = @pkgobject
| 1 = @decltypeobject
| 2 = @builtintypeobject
| 3 = @declconstobject
| 4 = @builtinconstobject
| 5 = @declvarobject
| 6 = @declfunctionobject
| 7 = @builtinfunctionobject
| 8 = @labelobject;
@declobject = @decltypeobject | @declconstobject | @declvarobject | @declfunctionobject;
@builtinobject = @builtintypeobject | @builtinconstobject | @builtinfunctionobject;
@typeobject = @decltypeobject | @builtintypeobject;
@valueobject = @constobject | @varobject | @functionobject;
@constobject = @declconstobject | @builtinconstobject;
@varobject = @declvarobject;
@functionobject = @declfunctionobject | @builtinfunctionobject;
case @scope.kind of
0 = @universescope
| 1 = @packagescope
| 2 = @localscope;
case @type.kind of
0 = @invalidtype
| 1 = @boolexprtype
| 2 = @inttype
| 3 = @int8type
| 4 = @int16type
| 5 = @int32type
| 6 = @int64type
| 7 = @uinttype
| 8 = @uint8type
| 9 = @uint16type
| 10 = @uint32type
| 11 = @uint64type
| 12 = @uintptrtype
| 13 = @float32type
| 14 = @float64type
| 15 = @complex64type
| 16 = @complex128type
| 17 = @stringexprtype
| 18 = @unsafepointertype
| 19 = @boolliteraltype
| 20 = @intliteraltype
| 21 = @runeliteraltype
| 22 = @floatliteraltype
| 23 = @complexliteraltype
| 24 = @stringliteraltype
| 25 = @nilliteraltype
| 26 = @arraytype
| 27 = @slicetype
| 28 = @structtype
| 29 = @pointertype
| 30 = @interfacetype
| 31 = @tupletype
| 32 = @signaturetype
| 33 = @maptype
| 34 = @sendchantype
| 35 = @recvchantype
| 36 = @sendrcvchantype
| 37 = @namedtype;
@basictype = @booltype | @numerictype | @stringtype | @literaltype | @invalidtype | @unsafepointertype;
@booltype = @boolexprtype | @boolliteraltype;
@numerictype = @integertype | @floattype | @complextype;
@integertype = @signedintegertype | @unsignedintegertype;
@signedintegertype = @inttype | @int8type | @int16type | @int32type | @int64type | @intliteraltype | @runeliteraltype;
@unsignedintegertype = @uinttype | @uint8type | @uint16type | @uint32type | @uint64type | @uintptrtype;
@floattype = @float32type | @float64type | @floatliteraltype;
@complextype = @complex64type | @complex128type | @complexliteraltype;
@stringtype = @stringexprtype | @stringliteraltype;
@literaltype = @boolliteraltype | @intliteraltype | @runeliteraltype | @floatliteraltype | @complexliteraltype
| @stringliteraltype | @nilliteraltype;
@compositetype = @containertype | @structtype | @pointertype | @interfacetype | @tupletype | @signaturetype | @namedtype;
@containertype = @arraytype | @slicetype | @maptype | @chantype;
@chantype = @sendchantype | @recvchantype | @sendrcvchantype;
case @modexpr.kind of
0 = @modcommentblock
| 1 = @modline
| 2 = @modlineblock
| 3 = @modlparen
| 4 = @modrparen;
case @error.kind of
0 = @unknownerror
| 1 = @listerror
| 2 = @parseerror
| 3 = @typeerror;

View File

@@ -0,0 +1,420 @@
/** Auto-generated dbscheme; do not edit. */
/** Duplicate code **/
duplicateCode(
unique int id : @duplication,
varchar(900) relativePath : string ref,
int equivClass : int ref);
similarCode(
unique int id : @similarity,
varchar(900) relativePath : string ref,
int equivClass : int ref);
@duplication_or_similarity = @duplication | @similarity;
tokens(
int id : @duplication_or_similarity ref,
int offset : int ref,
int beginLine : int ref,
int beginColumn : int ref,
int endLine : int ref,
int endColumn : int ref);
/** External data **/
externalData(
int id : @externalDataElement,
varchar(900) path : string ref,
int column: int ref,
varchar(900) value : string ref
);
snapshotDate(unique date snapshotDate : date ref);
sourceLocationPrefix(varchar(900) prefix : string ref);
locations_default(unique int id: @location_default, int file: @file ref, int beginLine: int ref, int beginColumn: int ref,
int endLine: int ref, int endColumn: int ref);
numlines(int element_id: @sourceline ref, int num_lines: int ref, int num_code: int ref, int num_comment: int ref);
files(unique int id: @file, string name: string ref, string simple: string ref, string ext: string ref, int fromSource: int ref);
folders(unique int id: @folder, string name: string ref, string simple: string ref);
containerparent(int parent: @container ref, unique int child: @container ref);
has_location(unique int locatable: @locatable ref, int location: @location ref);
comment_groups(unique int id: @comment_group);
comments(unique int id: @comment, int kind: int ref, int parent: @comment_group ref, int idx: int ref, string text: string ref);
doc_comments(unique int node: @documentable ref, int comment: @comment_group ref);
#keyset[parent, idx]
exprs(unique int id: @expr, int kind: int ref, int parent: @exprparent ref, int idx: int ref);
literals(unique int expr: @expr ref, string value: string ref, string raw: string ref);
constvalues(unique int expr: @expr ref, string value: string ref, string exact: string ref);
fields(unique int id: @field, int parent: @fieldparent ref, int idx: int ref);
#keyset[parent, idx]
stmts(unique int id: @stmt, int kind: int ref, int parent: @stmtparent ref, int idx: int ref);
#keyset[parent, idx]
decls(unique int id: @decl, int kind: int ref, int parent: @declparent ref, int idx: int ref);
#keyset[parent, idx]
specs(unique int id: @spec, int kind: int ref, int parent: @gendecl ref, int idx: int ref);
scopes(unique int id: @scope, int kind: int ref);
scopenesting(unique int inner: @scope ref, int outer: @scope ref);
scopenodes(unique int node: @scopenode ref, int scope: @localscope ref);
objects(unique int id: @object, int kind: int ref, string name: string ref);
objectscopes(unique int object: @object ref, int scope: @scope ref);
objecttypes(unique int object: @object ref, int tp: @type ref);
methodreceivers(unique int method: @object ref, int receiver: @object ref);
fieldstructs(unique int field: @object ref, int struct: @structtype ref);
methodhosts(int method: @object ref, int host: @namedtype ref);
defs(int ident: @ident ref, int object: @object ref);
uses(int ident: @ident ref, int object: @object ref);
types(unique int id: @type, int kind: int ref);
type_of(unique int expr: @expr ref, int tp: @type ref);
typename(unique int tp: @type ref, string name: string ref);
key_type(unique int map: @maptype ref, int tp: @type ref);
element_type(unique int container: @containertype ref, int tp: @type ref);
base_type(unique int ptr: @pointertype ref, int tp: @type ref);
underlying_type(unique int named: @namedtype ref, int tp: @type ref);
#keyset[parent, index]
component_types(int parent: @compositetype ref, int index: int ref, string name: string ref, int tp: @type ref);
array_length(unique int tp: @arraytype ref, string len: string ref);
type_objects(unique int tp: @type ref, int object: @object ref);
packages(unique int id: @package, string name: string ref, string path: string ref, int scope: @packagescope ref);
#keyset[parent, idx]
modexprs(unique int id: @modexpr, int kind: int ref, int parent: @modexprparent ref, int idx: int ref);
#keyset[parent, idx]
modtokens(string token: string ref, int parent: @modexpr ref, int idx: int ref);
@container = @file | @folder;
@locatable = @node | @localscope;
@node = @documentable | @exprparent | @modexprparent | @fieldparent | @stmtparent | @declparent | @scopenode
| @comment_group | @comment;
@documentable = @file | @field | @spec | @gendecl | @funcdecl | @modexpr;
@exprparent = @funcdef | @file | @expr | @field | @stmt | @decl | @spec;
@modexprparent = @file | @modexpr;
@fieldparent = @decl | @structtypeexpr | @functypeexpr | @interfacetypeexpr;
@stmtparent = @funcdef | @stmt | @decl;
@declparent = @file | @declstmt;
@funcdef = @funclit | @funcdecl;
@scopenode = @file | @functypeexpr | @blockstmt | @ifstmt | @caseclause | @switchstmt | @commclause | @loopstmt;
@location = @location_default;
@sourceline = @locatable;
case @comment.kind of
0 = @slashslashcomment
| 1 = @slashstarcomment;
case @expr.kind of
0 = @badexpr
| 1 = @ident
| 2 = @ellipsis
| 3 = @intlit
| 4 = @floatlit
| 5 = @imaglit
| 6 = @charlit
| 7 = @stringlit
| 8 = @funclit
| 9 = @compositelit
| 10 = @parenexpr
| 11 = @selectorexpr
| 12 = @indexexpr
| 13 = @sliceexpr
| 14 = @typeassertexpr
| 15 = @callorconversionexpr
| 16 = @starexpr
| 17 = @keyvalueexpr
| 18 = @arraytypeexpr
| 19 = @structtypeexpr
| 20 = @functypeexpr
| 21 = @interfacetypeexpr
| 22 = @maptypeexpr
| 23 = @plusexpr
| 24 = @minusexpr
| 25 = @notexpr
| 26 = @complementexpr
| 27 = @derefexpr
| 28 = @addressexpr
| 29 = @arrowexpr
| 30 = @lorexpr
| 31 = @landexpr
| 32 = @eqlexpr
| 33 = @neqexpr
| 34 = @lssexpr
| 35 = @leqexpr
| 36 = @gtrexpr
| 37 = @geqexpr
| 38 = @addexpr
| 39 = @subexpr
| 40 = @orexpr
| 41 = @xorexpr
| 42 = @mulexpr
| 43 = @quoexpr
| 44 = @remexpr
| 45 = @shlexpr
| 46 = @shrexpr
| 47 = @andexpr
| 48 = @andnotexpr
| 49 = @sendchantypeexpr
| 50 = @recvchantypeexpr
| 51 = @sendrcvchantypeexpr;
@basiclit = @intlit | @floatlit | @imaglit | @charlit | @stringlit;
@operatorexpr = @logicalexpr | @arithmeticexpr | @bitwiseexpr | @unaryexpr | @binaryexpr;
@logicalexpr = @logicalunaryexpr | @logicalbinaryexpr;
@arithmeticexpr = @arithmeticunaryexpr | @arithmeticbinaryexpr;
@bitwiseexpr = @bitwiseunaryexpr | @bitwisebinaryexpr;
@unaryexpr = @logicalunaryexpr | @bitwiseunaryexpr | @arithmeticunaryexpr | @derefexpr | @addressexpr | @arrowexpr;
@logicalunaryexpr = @notexpr;
@bitwiseunaryexpr = @complementexpr;
@arithmeticunaryexpr = @plusexpr | @minusexpr;
@binaryexpr = @logicalbinaryexpr | @bitwisebinaryexpr | @arithmeticbinaryexpr | @comparison;
@logicalbinaryexpr = @lorexpr | @landexpr;
@bitwisebinaryexpr = @shiftexpr | @orexpr | @xorexpr | @andexpr | @andnotexpr;
@arithmeticbinaryexpr = @addexpr | @subexpr | @mulexpr | @quoexpr | @remexpr;
@shiftexpr = @shlexpr | @shrexpr;
@comparison = @equalitytest | @relationalcomparison;
@equalitytest = @eqlexpr | @neqexpr;
@relationalcomparison = @lssexpr | @leqexpr | @gtrexpr | @geqexpr;
@chantypeexpr = @sendchantypeexpr | @recvchantypeexpr | @sendrcvchantypeexpr;
case @stmt.kind of
0 = @badstmt
| 1 = @declstmt
| 2 = @emptystmt
| 3 = @labeledstmt
| 4 = @exprstmt
| 5 = @sendstmt
| 6 = @incstmt
| 7 = @decstmt
| 8 = @gostmt
| 9 = @deferstmt
| 10 = @returnstmt
| 11 = @breakstmt
| 12 = @continuestmt
| 13 = @gotostmt
| 14 = @fallthroughstmt
| 15 = @blockstmt
| 16 = @ifstmt
| 17 = @caseclause
| 18 = @exprswitchstmt
| 19 = @typeswitchstmt
| 20 = @commclause
| 21 = @selectstmt
| 22 = @forstmt
| 23 = @rangestmt
| 24 = @assignstmt
| 25 = @definestmt
| 26 = @addassignstmt
| 27 = @subassignstmt
| 28 = @mulassignstmt
| 29 = @quoassignstmt
| 30 = @remassignstmt
| 31 = @andassignstmt
| 32 = @orassignstmt
| 33 = @xorassignstmt
| 34 = @shlassignstmt
| 35 = @shrassignstmt
| 36 = @andnotassignstmt;
@incdecstmt = @incstmt | @decstmt;
@assignment = @simpleassignstmt | @compoundassignstmt;
@simpleassignstmt = @assignstmt | @definestmt;
@compoundassignstmt = @addassignstmt | @subassignstmt | @mulassignstmt | @quoassignstmt | @remassignstmt
| @andassignstmt | @orassignstmt | @xorassignstmt | @shlassignstmt | @shrassignstmt | @andnotassignstmt;
@branchstmt = @breakstmt | @continuestmt | @gotostmt | @fallthroughstmt;
@switchstmt = @exprswitchstmt | @typeswitchstmt;
@loopstmt = @forstmt | @rangestmt;
case @decl.kind of
0 = @baddecl
| 1 = @importdecl
| 2 = @constdecl
| 3 = @typedecl
| 4 = @vardecl
| 5 = @funcdecl;
@gendecl = @importdecl | @constdecl | @typedecl | @vardecl;
case @spec.kind of
0 = @importspec
| 1 = @valuespec
| 2 = @typespec;
case @object.kind of
0 = @pkgobject
| 1 = @decltypeobject
| 2 = @builtintypeobject
| 3 = @declconstobject
| 4 = @builtinconstobject
| 5 = @declvarobject
| 6 = @declfunctionobject
| 7 = @builtinfunctionobject
| 8 = @labelobject;
@declobject = @decltypeobject | @declconstobject | @declvarobject | @declfunctionobject;
@builtinobject = @builtintypeobject | @builtinconstobject | @builtinfunctionobject;
@typeobject = @decltypeobject | @builtintypeobject;
@valueobject = @constobject | @varobject | @functionobject;
@constobject = @declconstobject | @builtinconstobject;
@varobject = @declvarobject;
@functionobject = @declfunctionobject | @builtinfunctionobject;
case @scope.kind of
0 = @universescope
| 1 = @packagescope
| 2 = @localscope;
case @type.kind of
0 = @invalidtype
| 1 = @boolexprtype
| 2 = @inttype
| 3 = @int8type
| 4 = @int16type
| 5 = @int32type
| 6 = @int64type
| 7 = @uinttype
| 8 = @uint8type
| 9 = @uint16type
| 10 = @uint32type
| 11 = @uint64type
| 12 = @uintptrtype
| 13 = @float32type
| 14 = @float64type
| 15 = @complex64type
| 16 = @complex128type
| 17 = @stringexprtype
| 18 = @unsafepointertype
| 19 = @boolliteraltype
| 20 = @intliteraltype
| 21 = @runeliteraltype
| 22 = @floatliteraltype
| 23 = @complexliteraltype
| 24 = @stringliteraltype
| 25 = @nilliteraltype
| 26 = @arraytype
| 27 = @slicetype
| 28 = @structtype
| 29 = @pointertype
| 30 = @interfacetype
| 31 = @tupletype
| 32 = @signaturetype
| 33 = @maptype
| 34 = @sendchantype
| 35 = @recvchantype
| 36 = @sendrcvchantype
| 37 = @namedtype;
@basictype = @booltype | @numerictype | @stringtype | @literaltype | @invalidtype | @unsafepointertype;
@booltype = @boolexprtype | @boolliteraltype;
@numerictype = @integertype | @floattype | @complextype;
@integertype = @signedintegertype | @unsignedintegertype;
@signedintegertype = @inttype | @int8type | @int16type | @int32type | @int64type | @intliteraltype | @runeliteraltype;
@unsignedintegertype = @uinttype | @uint8type | @uint16type | @uint32type | @uint64type | @uintptrtype;
@floattype = @float32type | @float64type | @floatliteraltype;
@complextype = @complex64type | @complex128type | @complexliteraltype;
@stringtype = @stringexprtype | @stringliteraltype;
@literaltype = @boolliteraltype | @intliteraltype | @runeliteraltype | @floatliteraltype | @complexliteraltype
| @stringliteraltype | @nilliteraltype;
@compositetype = @containertype | @structtype | @pointertype | @interfacetype | @tupletype | @signaturetype | @namedtype;
@containertype = @arraytype | @slicetype | @maptype | @chantype;
@chantype = @sendchantype | @recvchantype | @sendrcvchantype;
case @modexpr.kind of
0 = @modcommentblock
| 1 = @modline
| 2 = @modlineblock
| 3 = @modlparen
| 4 = @modrparen;

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description: Add tables for extracting frontend errors.
compatibility: backwards