v.ast #

fn all_registers(mut t Table, arch pref.Arch) map[string]ScopeObject

return all the registers for the given architecture

fn args2str(args []CallArg) string

fn empty_comptime_const_expr() ComptTimeConstValue

fn merge_types(params ...[]Type) []Type

fn mktyp(typ Type) Type

fn new_table() &Table

fn new_type(idx int) Type

return new type with TypeSymbol idx set to idx

fn new_type_ptr(idx int, nr_muls int) Type

return new type with TypeSymbol idx set to idx & nr_muls set to nr_muls

fn pref_arch_to_table_language(pref_arch pref.Arch) Language

fn resolve_init(node StructInit, typ Type, t &Table) Expr

fn set_global_table(t &Table)

fn sharetype_from_flags(is_shared bool, is_atomic bool) ShareType

fn type_can_start_with_token(tok &token.Token) bool

fn (attrs []Attr) contains(str string) bool

fn (attrs []Attr) find_first(aname string) ?Attr

fn (attrs []Attr) find_last(aname string) ?Attr

fn (attrs []Attr) find_comptime_define() ?int

fn (kinds []Kind) str() string

type AsmArg = AsmAddressing
	| AsmAlias
	| AsmDisp
	| AsmRegister
	| BoolLiteral
	| CharLiteral
	| FloatLiteral
	| IntegerLiteral
	| string

[eax+5] | j | displacement literal (e.g. 123 in [rax + 123] ) | eax | true | a | 0.594 | 123 | label_name

type ComptTimeConstValue = EmptyExpr
	| f32
	| f64
	| i16
	| i64
	| i8
	| int
	| rune
	| string
	| u16
	| u32
	| u64
	| u8

fn (val ComptTimeConstValue) i8() ?i8

fn (val ComptTimeConstValue) i16() ?i16

fn (val ComptTimeConstValue) int() ?int

fn (val ComptTimeConstValue) i64() ?i64

fn (val ComptTimeConstValue) u8() ?u8

fn (val ComptTimeConstValue) u16() ?u16

fn (val ComptTimeConstValue) u32() ?u32

fn (val ComptTimeConstValue) u64() ?u64

fn (val ComptTimeConstValue) f32() ?f32

fn (val ComptTimeConstValue) f64() ?f64

fn (val ComptTimeConstValue) string() ?string

type EmptyExpr = u8

type Expr = AnonFn
	| ArrayDecompose
	| ArrayInit
	| AsCast
	| Assoc
	| AtExpr
	| BoolLiteral
	| CTempVar
	| CallExpr
	| CastExpr
	| ChanInit
	| CharLiteral
	| Comment
	| ComptimeCall
	| ComptimeSelector
	| ComptimeType
	| ConcatExpr
	| DumpExpr
	| EmptyExpr
	| EnumVal
	| FloatLiteral
	| GoExpr
	| Ident
	| IfExpr
	| IfGuardExpr
	| IndexExpr
	| InfixExpr
	| IntegerLiteral
	| IsRefType
	| Likely
	| LockExpr
	| MapInit
	| MatchExpr
	| Nil
	| NodeError
	| None
	| OffsetOf
	| OrExpr
	| ParExpr
	| PostfixExpr
	| PrefixExpr
	| RangeExpr
	| SelectExpr
	| SelectorExpr
	| SizeOf
	| SqlExpr
	| StringInterLiteral
	| StringLiteral
	| StructInit
	| TypeNode
	| TypeOf
	| UnsafeExpr

fn (expr Expr) is_auto_deref_var() bool

fn (expr Expr) is_blank_ident() bool

fn (expr Expr) is_expr() bool

fn (expr Expr) is_literal() bool

is expr a literal, i.e. it does not depend on any other declarations (C compile time constant)

fn (e &Expr) is_lockable() bool

returns if an expression can be used in lock x, y.z {

fn (expr Expr) is_lvalue() bool

fn (expr Expr) is_pure_literal() bool

fn (expr Expr) pos() token.Pos

fn (x Expr) str() string

string representation of expr

type FnPanicHandler = fn (&Table, string)

type IdentInfo = IdentFn | IdentVar

type Node = CallArg
	| ConstField
	| EmptyNode
	| EnumField
	| Expr
	| File
	| GlobalField
	| IfBranch
	| MatchBranch
	| NodeError
	| Param
	| ScopeObject
	| SelectBranch
	| Stmt
	| StructField
	| StructInitField

TODO: replace Param

fn (node Node) pos() token.Pos

fn (node Node) children() []Node

type ScopeObject = AsmRegister | ConstField | GlobalField | Var

fn (obj ScopeObject) is_simple_define_const() bool

type Stmt = AsmStmt
	| AssertStmt
	| AssignStmt
	| Block
	| BranchStmt
	| ComptimeFor
	| ConstDecl
	| DeferStmt
	| EmptyStmt
	| EnumDecl
	| ExprStmt
	| FnDecl
	| ForCStmt
	| ForInStmt
	| ForStmt
	| GlobalDecl
	| GotoLabel
	| GotoStmt
	| HashStmt
	| Import
	| InterfaceDecl
	| Module
	| NodeError
	| Return
	| SqlStmt
	| StructDecl
	| TypeDecl

fn (node Stmt) str() string

type Type = int

fn (t Type) atomic_typename() string

<atomic.h> defines special typenames

fn (t Type) share() ShareType

fn (t Type) idx() int

return TypeSymbol idx for t

fn (t Type) is_void() bool

fn (t Type) is_full() bool

fn (t Type) nr_muls() int

return nr_muls for t

fn (t Type) is_ptr() bool

return true if t is a pointer (nr_muls>0)

fn (t Type) is_any_kind_of_pointer() bool

fn (t Type) set_nr_muls(nr_muls int) Type

set nr_muls on t and return it

fn (t Type) ref() Type

increments nr_muls on t and return it

fn (t Type) deref() Type

decrement nr_muls on t and return it

fn (t Type) set_flag(flag TypeFlag) Type

set flag on t and return t

fn (t Type) clear_flag(flag TypeFlag) Type

clear flag on t and return t

fn (t Type) clear_flags() Type

clear all flags

fn (t Type) has_flag(flag TypeFlag) bool

return true if flag is set on t

fn (t Type) str() string

fn (t Type) debug() []string

debug returns a verbose representation of the information in the type t, useful for tracing/debugging

fn (t Type) derive(t_from Type) Type

copy flags & nr_muls from t_from to t and return t

fn (t Type) derive_add_muls(t_from Type) Type

copy flags from t_from to t and return t

fn (typ Type) is_pointer() bool

fn (typ Type) is_voidptr() bool

fn (typ Type) is_real_pointer() bool

fn (typ Type) is_float() bool

fn (typ Type) is_int() bool

fn (typ Type) is_int_valptr() bool

fn (typ Type) is_float_valptr() bool

fn (typ Type) is_pure_int() bool

fn (typ Type) is_pure_float() bool

fn (typ Type) is_signed() bool

fn (typ Type) is_unsigned() bool

fn (typ Type) flip_signedness() Type

fn (typ Type) is_int_literal() bool

fn (typ Type) is_number() bool

fn (typ Type) is_string() bool

fn (typ Type) is_bool() bool

type TypeDecl = AliasTypeDecl | FnTypeDecl | SumTypeDecl

type TypeInfo = Aggregate
	| Alias
	| Array
	| ArrayFixed
	| Chan
	| Enum
	| FnType
	| GenericInst
	| Interface
	| Map
	| MultiReturn
	| Struct
	| SumType
	| Thread

enum AddressingMode {
	invalid
	displacement // displacement
	base // base
	base_plus_displacement // base + displacement
	index_times_scale_plus_displacement // (index ∗ scale) + displacement
	base_plus_index_plus_displacement // base + (index ∗ scale) + displacement
	base_plus_index_times_scale_plus_displacement // base + index + displacement
	rip_plus_displacement // rip + displacement
}

adressing modes:

enum AttrKind {
	plain // [name]
	string // ['name']
	number // [123]
	bool // [true] || [false]
	comptime_define // [if name]
}

enum ComptimeForKind {
	methods
	fields
	attributes
}

fn (e ComptimeForKind) str() string

enum ComptimeTypeKind {
	map_
	int
	float
	struct_
	iface
	array
	sum_type
	enum_
}

enum GenericKindField {
	unknown
	name
	typ
}

enum IdentKind {
	unresolved
	blank_ident
	variable
	constant
	global
	function
}

enum Kind {
	placeholder
	void
	voidptr
	byteptr
	charptr
	i8
	i16
	int
	i64
	isize
	u8
	u16
	u32
	u64
	usize
	f32
	f64
	char
	rune
	bool
	none_
	string
	array
	array_fixed
	map
	chan
	any
	struct_
	generic_inst
	multi_return
	sum_type
	alias
	enum_
	function
	interface_
	float_literal
	int_literal
	aggregate
	thread
}

fn (k Kind) str() string

for debugging/errors only, perf is not an issue

enum Language {
	v
	c
	js
	amd64 // aka x86_64
	i386
	arm64 // 64-bit arm
	arm32 // 32-bit arm
	rv64 // 64-bit risc-v
	rv32 // 32-bit risc-v
	wasm32
}

enum OrKind {
	absent
	block
	propagate_option
	propagate_result
}

enum ShareType {
	mut_t
	shared_t
	atomic_t
}

fn (t ShareType) str() string

enum SqlStmtKind {
	insert
	update
	delete
	create
	drop
}

enum StructInitKind {
	normal
	short_syntax
	anon
}

enum TypeFlag {
	optional
	result
	variadic
	generic
	shared_f
	atomic_f
}

max of 8

struct Aggregate {
mut:
	fields []StructField // used for faster lookup inside the module
pub:
	sum_type Type
	types    []Type
}

struct Alias {
pub:
	parent_type Type
	language    Language
	is_import   bool
}

struct AliasTypeDecl {
pub:
	name        string
	is_pub      bool
	parent_type Type
	pos         token.Pos
	type_pos    token.Pos
	comments    []Comment
}

struct AnonFn {
pub mut:
	decl           FnDecl
	inherited_vars []Param
	typ            Type // the type of anonymous fn. Both .typ and .decl.name are auto generated
	has_gen        bool // has been generated
}

anonymous function

fn (node &AnonFn) stringify(t &Table, cur_mod string, m2a map[string]string) string

These methods are used only by vfmt, vdoc, and for debugging.

struct Array {
pub:
	nr_dims int
pub mut:
	elem_type Type
}

struct ArrayDecompose {
pub:
	pos token.Pos
pub mut:
	expr      Expr
	expr_type Type
	arg_type  Type
}

struct ArrayFixed {
pub:
	size      int
	size_expr Expr // used by fmt for e.g. ´[my_const]u8´
pub mut:
	elem_type Type
}

struct ArrayInit {
pub:
	pos           token.Pos   // `[]` in []Type{} position
	elem_type_pos token.Pos   // `Type` in []Type{} position
	ecmnts        [][]Comment // optional iembed comments after each expr
	pre_cmnts     []Comment
	is_fixed      bool
	has_val       bool // fixed size literal `[expr, expr]!`
	mod           string
	has_len       bool
	has_cap       bool
	has_default   bool
	has_it        bool // true if temp variable it is used
pub mut:
	exprs        []Expr // `[expr, expr]` or `[expr]Type{}` for fixed array
	len_expr     Expr   // len: expr
	cap_expr     Expr   // cap: expr
	default_expr Expr   // init: expr
	expr_types   []Type // [Dog, Cat] // also used for interface_types
	elem_type    Type   // element type
	default_type Type   // default value type
	typ          Type   // array type
}

struct AsCast {
pub:
	typ Type // to type
	pos token.Pos
pub mut:
	expr      Expr // from expr: `expr` in `expr as Ident`
	expr_type Type // from type
}

expr as Ident

struct AsmAddressing {
pub:
	scale int = -1 // 1, 2, 4, or 8 literal
	mode  AddressingMode
	pos   token.Pos
pub mut:
	segment      string // fs:
	displacement AsmArg // 8, 16 or 32 bit literal value
	base         AsmArg // gpr
	index        AsmArg // gpr
}

struct AsmAlias {
pub:
	pos token.Pos
pub mut:
	name string // a
}

struct AsmClobbered {
pub mut:
	reg      AsmRegister
	comments []Comment
}

struct AsmDisp {
pub:
	val string
	pos token.Pos
}

struct AsmIO {
pub:
	alias      string    // [alias_a]
	constraint string    // '=r' TODO: allow all backends to easily use this with a struct
	expr       Expr      // (a)
	comments   []Comment // // this is a comment
	typ        Type
	pos        token.Pos
}

: [alias_a] '=r' (a) // this is a comment

struct AsmRegister {
pub mut:
	name string // eax or r12d etc.
	typ  Type
	size int
}

struct AsmStmt {
pub:
	arch        pref.Arch
	is_basic    bool
	is_volatile bool
	is_goto     bool
	clobbered   []AsmClobbered
	pos         token.Pos
pub mut:
	templates     []AsmTemplate
	scope         &Scope = unsafe { nil }
	output        []AsmIO
	input         []AsmIO
	global_labels []string // labels defined in assembly block, exported with `.globl`
	local_labels  []string // local to the assembly block
}

struct AsmTemplate {
pub mut:
	name         string
	is_label     bool // `example_label:`
	is_directive bool // .globl assembly_function
	args         []AsmArg
	comments     []Comment
	pos          token.Pos
}

struct AssertStmt {
pub:
	pos       token.Pos
	extra_pos token.Pos
pub mut:
	expr    Expr
	extra   Expr
	is_used bool // asserts are used in _test.v files, as well as in non -prod builds of all files
}

struct AssignStmt {
pub:
	op           token.Kind // include: =,:=,+=,-=,*=,/= and so on; for a list of all the assign operators, see vlib/token/token.v
	pos          token.Pos
	comments     []Comment
	end_comments []Comment
pub mut:
	right         []Expr
	left          []Expr
	left_types    []Type
	right_types   []Type
	is_static     bool // for translated code only
	is_volatile   bool // for disabling variable access optimisations (needed for hardware drivers)
	is_simple     bool // `x+=2` in `for x:=1; ; x+=2`
	has_cross_var bool
}

variable assign statement

struct Assoc {
pub:
	var_name string
	fields   []string
	pos      token.Pos
pub mut:
	exprs []Expr
	typ   Type
	scope &Scope = unsafe { nil }
}

deprecated

struct AtExpr {
pub:
	name string
	pos  token.Pos
	kind token.AtKind
pub mut:
	val string
}

@FN, @STRUCT, @MOD etc. See full list in token.valid_at_tokens

struct Attr {
pub:
	name    string // [name]
	has_arg bool
	arg     string // [name: arg]
	kind    AttrKind
	ct_expr Expr // .kind == comptime_define, for [if !name]
	ct_opt  bool // true for [if user_defined_name?]
	pos     token.Pos
pub mut:
	ct_evaled bool // whether ct_skip has been evaluated already
	ct_skip   bool // is the comptime expr *false*, filled by checker
}

e.g. [unsafe]

fn (a Attr) debug() string

fn (a Attr) str() string

str returns the string representation without square brackets

struct Block {
pub:
	stmts     []Stmt
	is_unsafe bool
	pos       token.Pos
}

{stmts} or unsafe {stmts}

struct BoolLiteral {
pub:
	val bool
	pos token.Pos
}

struct BranchStmt {
pub:
	kind  token.Kind
	label string
	pos   token.Pos
}

break, continue

fn (node &BranchStmt) str() string

struct CallArg {
pub:
	is_mut   bool
	share    ShareType
	comments []Comment
pub mut:
	expr            Expr
	typ             Type
	is_tmp_autofree bool // this tells cgen that a tmp variable has to be used for the arg expression in order to free it after the call
	pos             token.Pos
// tmp_name        string // for autofree
}

function call argument: f(callarg)

fn (a CallArg) str() string

struct CallExpr {
pub:
	pos      token.Pos
	name_pos token.Pos
	mod      string
pub mut:
	name               string // left.name()
	is_method          bool
	is_field           bool // temp hack, remove ASAP when re-impl CallExpr / Selector (joe)
	is_fn_var          bool // fn variable
	is_keep_alive      bool // GC must not free arguments before fn returns
	is_noreturn        bool // whether the function/method is marked as [noreturn]
	is_ctor_new        bool // if JS ctor calls requires `new` before call, marked as `[use_new]` in V
	args               []CallArg
	expected_arg_types []Type
	language           Language
	or_block           OrExpr
	left               Expr // `user` in `user.register()`
	left_type          Type // type of `user`
	receiver_type      Type // User
	return_type        Type
	fn_var_type        Type   // fn variable type
	should_be_skipped  bool   // true for calls to `[if someflag?]` functions, when there is no `-d someflag`
	concrete_types     []Type // concrete types, e.g. 
	concrete_list_pos  token.Pos
	raw_concrete_types []Type
	free_receiver      bool // true if the receiver expression needs to be freed
	scope              &Scope = unsafe { nil }
	from_embed_types   []Type // holds the type of the embed that the method is called from
	comments           []Comment
}

function or method call expr

fn (node &CallExpr) fkey() string

struct CastExpr {
pub mut:
	arg       Expr   // `n` in `string(buf, n)`
	typ       Type   // `string`
	expr      Expr   // `buf` in `string(buf, n)` and `&Type(buf)`
	typname   string // `&Type` in `&Type(buf)`
	expr_type Type   // `byteptr`, the type of the `buf` expression
	has_arg   bool   // true for `string(buf, n)`, false for `&Type(buf)`
	pos       token.Pos
}

struct Chan {
pub mut:
	elem_type Type
	is_mut    bool
}

struct ChanInit {
pub:
	pos           token.Pos
	elem_type_pos token.Pos
	has_cap       bool
pub mut:
	cap_expr  Expr
	typ       Type
	elem_type Type
}

struct CharLiteral {
pub:
	val string
	pos token.Pos
}

struct Comment {
pub:
	text      string
	is_multi  bool // true only for /* comment */, that use many lines
	is_inline bool // true for all /* comment */ comments
	pos       token.Pos
}

struct ComptimeCall {
pub:
	pos         token.Pos
	has_parens  bool // if $() is used, for vfmt
	method_name string
	method_pos  token.Pos
	scope       &Scope = unsafe { nil }
	left        Expr
	args_var    string
//
	is_vweb   bool
	vweb_tmpl File
//
	is_embed bool
//
	is_env  bool
	env_pos token.Pos
//
	is_pkgconfig bool
pub mut:
	left_type   Type
	result_type Type
	env_value   string
	args        []CallArg
	embed_file  EmbeddedFile
}

struct ComptimeFor {
pub:
	val_var string
	stmts   []Stmt
	kind    ComptimeForKind
	pos     token.Pos
	typ_pos token.Pos
pub mut:
// expr    Expr
	typ Type
}

struct ComptimeSelector {
pub:
	has_parens bool // if $() is used, for vfmt
	pos        token.Pos
pub mut:
	left       Expr
	left_type  Type
	field_expr Expr
	typ        Type
}

struct ComptimeType {
pub:
	kind ComptimeTypeKind
	pos  token.Pos
}

fn (cty ComptimeType) str() string

struct ConcatExpr {
pub:
	vals []Expr
	pos  token.Pos
pub mut:
	return_type Type
}

struct ConstDecl {
pub:
	is_pub bool
	pos    token.Pos
	attrs  []Attr // tags like `[markused]`, valid for all the consts in the list
pub mut:
	fields       []ConstField // all the const fields in the `const (...)` block
	end_comments []Comment    // comments that after last const field
	is_block     bool // const() block
}

const declaration

struct ConstField {
pub:
	mod         string
	name        string
	is_pub      bool
	is_markused bool // an explict `[markused]` tag; the const will NOT be removed by `-skip-unused`, no matter what
	pos         token.Pos
pub mut:
	expr         Expr      // the value expr of field; everything after `=`
	typ          Type      // the type of the const field, it can be any type in V
	comments     []Comment // comments before current const field
	end_comments []Comment // comments that after const field
// the comptime_expr_value field is filled by the checker, when it has enough
// info to evaluate the constant at compile time
	comptime_expr_value ComptTimeConstValue = empty_comptime_const_expr()
}

const field in const declaration group

fn (obj ConstField) comptime_expr_value() ?ComptTimeConstValue

fn (obj ConstField) is_simple_define_const() bool

struct CTempVar {
pub:
	name   string // the name of the C temporary variable; used by g.expr(x)
	typ    Type   // the type of the original expression
	is_ptr bool   // whether the type is a pointer
pub mut:
	orig Expr // the original expression, which produced the C temp variable; used by x.str()
}

CTempVar is used in cgen only, to hold nodes for temporary variables

struct DeferStmt {
pub:
	stmts []Stmt
	pos   token.Pos
pub mut:
	defer_vars []Ident
	ifdef      string
	idx_in_fn  int = -1 // index in FnDecl.defer_stmts
}

TODO: handle this differently v1 excludes non current os ifdefs so the defer's never get added in the first place

struct DumpExpr {
pub:
	pos token.Pos
pub mut:
	expr      Expr
	expr_type Type
	cname     string // filled in the checker
}

struct Embed {
pub:
	typ      Type
	pos      token.Pos
	comments []Comment
}

struct EmbeddedFile {
pub:
	rpath            string // used in the source code, as an ID/key to the embed
	apath            string // absolute path during compilation to the resource
	compression_type string
pub mut:
// these are set by gen_embed_file_init in v/gen/c/embed
	is_compressed bool
	bytes         []u8
	len           int
}

fn (e EmbeddedFile) hash() u64

struct EmptyNode {
pub:
	pos token.Pos
}

struct EmptyStmt {
pub:
	pos token.Pos
}

struct Enum {
pub:
	vals             []string
	is_flag          bool
	is_multi_allowed bool
	uses_exprs       bool
}

struct EnumDecl {
pub:
	name             string
	is_pub           bool
	is_flag          bool        // true when the enum has [flag] tag,for bit field enum
	is_multi_allowed bool        // true when the enum has [_allow_multiple_values] tag
	comments         []Comment   // comments before the first EnumField
	fields           []EnumField // all the enum fields
	attrs            []Attr      // attributes of enum declaration
	pos              token.Pos
}

enum declaration

struct EnumField {
pub:
	name          string
	pos           token.Pos
	comments      []Comment // comment after Enumfield in the same line
	next_comments []Comment // comments between current EnumField and next EnumField
	has_expr      bool      // true, when .expr has a value
pub mut:
	expr Expr // the value of current EnumField; 123 in `ename = 123`
}

enum field in enum declaration

struct EnumVal {
pub:
	enum_name string
	val       string
	mod       string // for full path `mod_Enum_val`
	pos       token.Pos
pub mut:
	typ Type
}

An enum value, like OS.macos or .macos

struct ExprStmt {
pub:
	pos      token.Pos
	comments []Comment
pub mut:
	expr    Expr
	is_expr bool
	typ     Type
}

| IncDecStmt k Stand-alone expression in a statement list.

struct File {
pub:
	nr_lines      int    // number of source code lines in the file (including newlines and comments)
	nr_bytes      int    // number of processed source code bytes
	mod           Module // the module of the source file (from `module xyz` at the top)
	global_scope  &Scope = unsafe { nil }
	is_test       bool // true for _test.v files
	is_generated  bool // true for `[generated] module xyz` files; turn off notices
	is_translated bool // true for `[translated] module xyz` files; turn off some checks
pub mut:
	idx              int    // index in an external container; can be used to refer to the file in a more efficient way, just by its integer index
	path             string // absolute path of the source file - '/projects/v/file.v'
	path_base        string // file name - 'file.v' (useful for tracing)
	scope            &Scope = unsafe { nil }
	stmts            []Stmt            // all the statements in the source file
	imports          []Import          // all the imports
	auto_imports     []string          // imports that were implicitely added
	embedded_files   []EmbeddedFile    // list of files to embed in the binary
	imported_symbols map[string]string // used for `import {symbol}`, it maps symbol => module.symbol
	errors           []errors.Error    // all the checker errors in the file
	warnings         []errors.Warning  // all the checker warnings in the file
	notices          []errors.Notice   // all the checker notices in the file
	generic_fns      []&FnDecl
	global_labels    []string // from `asm { .globl labelname }`
}

Each V source file is represented by one File structure.
When the V compiler runs, the parser will fill an []File.
That array is then passed to V's checker.

fn (f &File) free()

struct FloatLiteral {
pub:
	val string
	pos token.Pos
}

struct Fn {
pub:
	is_variadic     bool
	language        Language
	is_pub          bool
	is_ctor_new     bool // `[use_new] fn JS.Array.prototype.constructor()`
	is_deprecated   bool // `[deprecated] fn abc(){}`
	is_noreturn     bool // `[noreturn] fn abc(){}`
	is_unsafe       bool // `[unsafe] fn abc(){}`
	is_placeholder  bool
	is_main         bool // `fn main(){}`
	is_test         bool // `fn test_abc(){}`
	is_keep_alive   bool // passed memory must not be freed (by GC) before function returns
	is_method       bool // true for `fn (x T) name()`, and for interface declarations (which are also for methods)
	no_body         bool // a pure declaration like `fn abc(x int)`; used in .vh files, C./JS. fns.
	mod             string
	file            string
	file_mode       Language
	pos             token.Pos
	return_type_pos token.Pos
pub mut:
	return_type    Type
	receiver_type  Type // != 0, when .is_method == true
	name           string
	params         []Param
	source_fn      voidptr // set in the checker, while processing fn declarations
	usages         int
	generic_names  []string
	dep_names      []string // globals or consts dependent names
	attrs          []Attr   // all fn attributes
	is_conditional bool     // true for `[if abc]fn(){}`
	ctdefine_idx   int      // the index of the attribute, containing the compile time define [if mytag]
}

fn (node &Fn) fkey() string

fn (f &Fn) new_method_with_receiver_type(new_type Type) Fn

struct FnDecl {
pub:
	name            string // 'math.bits.normalize'
	short_name      string // 'normalize'
	mod             string // 'math.bits'
	is_deprecated   bool
	is_pub          bool
	is_variadic     bool
	is_anon         bool
	is_noreturn     bool        // true, when [noreturn] is used on a fn
	is_manualfree   bool        // true, when [manualfree] is used on a fn
	is_main         bool        // true for `fn main()`
	is_test         bool        // true for `fn test_abcde() {}`, false for `fn test_abc(x int) {}`, or for fns that do not start with test_
	is_conditional  bool        // true for `[if abc] fn abc(){}`
	is_exported     bool        // true for `[export: 'exact_C_name']`
	is_keep_alive   bool        // passed memory must not be freed (by GC) before function returns
	is_unsafe       bool        // true, when [unsafe] is used on a fn
	is_markused     bool        // true, when an explict `[markused]` tag was put on a fn; `-skip-unused` will not remove that fn
	receiver        StructField // TODO this is not a struct field
	receiver_pos    token.Pos   // `(u User)` in `fn (u User) name()` position
	is_method       bool
	method_type_pos token.Pos // `User` in ` fn (u User)` position
	method_idx      int
	rec_mut         bool // is receiver mutable
	rec_share       ShareType
	language        Language  // V, C, JS
	file_mode       Language  // whether *the file*, where a function was a '.c.v', '.js.v' etc.
	no_body         bool      // just a definition `fn C.malloc()`
	is_builtin      bool      // this function is defined in builtin/strconv
	body_pos        token.Pos // function bodys position
	file            string
	generic_names   []string
	is_direct_arr   bool // direct array access
	attrs           []Attr
	ctdefine_idx    int = -1 // the index in fn.attrs of `[if xyz]`, when such attribute exists
pub mut:
	idx               int // index in an external container; can be used to refer to the function in a more efficient way, just by its integer index
	params            []Param
	stmts             []Stmt
	defer_stmts       []DeferStmt
	return_type       Type
	return_type_pos   token.Pos // `string` in `fn (u User) name() string` position
	has_return        bool
	should_be_skipped bool      // true, when -skip-unused could not find any usages of that function, starting from main + other known used functions
	ninstances        int  // 0 for generic functions with no concrete instances
	has_await         bool // 'true' if this function uses JS.await
//
	comments      []Comment // comments *after* the header, but *before* `{`; used for InterfaceDecl
	end_comments  []Comment // comments *after* header declarations. E.g.: `fn C.C_func(x int) int // Comment`
	next_comments []Comment // comments that are one line after the decl; used for InterfaceDecl
//
	source_file &File  = unsafe { nil }
	scope       &Scope = unsafe { nil }
	label_names []string
	pos         token.Pos // function declaration position
}

function or method declaration

fn (node &FnDecl) fkey() string

fkey returns a unique name of the function/method.
it is used in table.used_fns and v.markused.

fn (node &FnDecl) modname() string

fn (f &FnDecl) new_method_with_receiver_type(new_type Type) FnDecl

fn (node &FnDecl) stringify(t &Table, cur_mod string, m2a map[string]string) string

struct FnSignatureOpts {
	skip_receiver bool
	type_only     bool
}

struct FnType {
pub mut:
	is_anon  bool
	has_decl bool
	func     Fn
}

struct FnTypeDecl {
pub:
	name     string
	is_pub   bool
	typ      Type
	pos      token.Pos
	type_pos token.Pos
	comments []Comment
	attrs    []Attr // attributes of type declaration
}

struct ForCStmt {
pub:
	has_init bool
	has_cond bool
	has_inc  bool
	is_multi bool // for a,b := 0,1; a < 10; a,b = a+b, a {...}
	pos      token.Pos
pub mut:
	init  Stmt // i := 0;
	cond  Expr // i < 10;
	inc   Stmt // i++; i += 2
	stmts []Stmt
	label string // `label: for {`
	scope &Scope = unsafe { nil }
}

struct ForInStmt {
pub:
	key_var    string
	val_var    string
	is_range   bool
	high       Expr // `10` in `for i in 0..10 {`
	stmts      []Stmt
	pos        token.Pos
	val_is_mut bool // `for mut val in vals {` means that modifying `val` will modify the array
// and the array cannot be indexed inside the loop
pub mut:
	val_is_ref bool // `for val in &arr {` means that value of `val` will be the reference of the value in `arr`
	cond       Expr
	key_type   Type
	val_type   Type
	cond_type  Type
	high_type  Type
	kind       Kind   // array/map/string
	label      string // `label: for {`
	scope      &Scope = unsafe { nil }
}

struct ForStmt {
pub:
	is_inf bool // `for {}`
	pos    token.Pos
pub mut:
	cond  Expr
	stmts []Stmt
	label string // `label: for {`
	scope &Scope = unsafe { nil }
}

struct GenericInst {
pub mut:
	parent_idx     int    // idx of the base generic struct
	concrete_types []Type // concrete types, e.g. 
}

instantiation of a generic struct

struct GetEmbedsOptions {
	preceding []Type
}

struct GlobalDecl {
pub:
	mod      string
	pos      token.Pos
	is_block bool   // __global() block
	attrs    []Attr // tags like `[markused]`, valid for all the globals in the list
pub mut:
	fields       []GlobalField
	end_comments []Comment
}

struct GlobalField {
pub:
	name        string
	has_expr    bool
	pos         token.Pos
	typ_pos     token.Pos
	is_markused bool // an explict `[markused]` tag; the global will NOT be removed by `-skip-unused`
	is_volatile bool
pub mut:
	expr     Expr
	typ      Type
	comments []Comment
}

struct GoExpr {
pub:
	pos token.Pos
pub mut:
	call_expr CallExpr
	is_expr   bool
}

struct GotoLabel {
pub:
	name string
	pos  token.Pos
}

struct GotoStmt {
pub:
	name string
	pos  token.Pos
}

struct HashStmt {
pub:
	mod         string
	pos         token.Pos
	source_file string
pub mut:
	val      string // example: 'include  # please install openssl // comment'
	kind     string // : 'include'
	main     string // : ''
	msg      string // : 'please install openssl'
	ct_conds []Expr // *all* comptime conditions, that must be true, for the hash to be processed
// ct_conds is filled by the checker, based on the current nesting of `$if cond1 {}` blocks
}

#include, #define etc

struct Ident {
pub:
	language Language
	tok_kind token.Kind
	pos      token.Pos
	mut_pos  token.Pos
	comptime bool
pub mut:
	scope  &Scope = unsafe { nil }
	obj    ScopeObject
	mod    string
	name   string
	kind   IdentKind
	info   IdentInfo
	is_mut bool // if mut *token* is before name. Use `is_mut()` to lookup mut variable
}

A single identifier

fn (i &Ident) is_mut() bool

fn (i &Ident) var_info() IdentVar

struct IdentFn {
pub mut:
	typ Type
}

struct IdentVar {
pub mut:
	typ         Type
	is_mut      bool
	is_static   bool
	is_volatile bool
	is_optional bool
	share       ShareType
}

TODO: (joe) remove completely, use ident.obj instead which points to the scope object

struct IfBranch {
pub:
	pos      token.Pos
	body_pos token.Pos
	comments []Comment
pub mut:
	cond      Expr
	pkg_exist bool
	stmts     []Stmt
	scope     &Scope = unsafe { nil }
}

struct IfExpr {
pub:
	is_comptime   bool
	tok_kind      token.Kind
	pos           token.Pos
	post_comments []Comment
pub mut:
	left     Expr       // `a` in `a := if ...`
	branches []IfBranch // includes all `else if` branches
	is_expr  bool
	typ      Type
	has_else bool
// implements bool // comptime $if implements interface
}

struct IfGuardExpr {
pub:
	vars []IfGuardVar
pub mut:
	expr      Expr
	expr_type Type
}

if x := opt() {

struct IfGuardVar {
pub mut:
	name   string
	is_mut bool
	pos    token.Pos
}

struct Import {
pub:
	mod       string // the module name of the import
	alias     string // the `x` in `import xxx as x`
	pos       token.Pos
	mod_pos   token.Pos
	alias_pos token.Pos
	syms_pos  token.Pos
pub mut:
	syms          []ImportSymbol // the list of symbols in `import {symbol1, symbol2}`
	comments      []Comment
	next_comments []Comment
}

import statement

struct ImportSymbol {
pub:
	pos  token.Pos
	name string
}

import symbol,for import {symbol} syntax

struct IndexExpr {
pub:
	pos token.Pos
pub mut:
	index     Expr // [0], RangeExpr [start..end] or map[key]
	or_expr   OrExpr
	left      Expr
	left_type Type // array, map, fixed array
	is_setter bool
	is_map    bool
	is_array  bool
	is_farray bool
	is_option bool // IfGuard
	is_direct bool // Set if the underlying memory can be safely accessed
	is_gated  bool // #[] gated array
}

fn (mut lx IndexExpr) recursive_mapset_is_setter(val bool)

helper for dealing with m[k1][k2][k3][k3] = value

fn (mut lx IndexExpr) recursive_arraymap_set_is_setter()

struct InfixExpr {
pub:
	op      token.Kind
	pos     token.Pos
	is_stmt bool
pub mut:
	left        Expr
	right       Expr
	left_type   Type
	right_type  Type
	auto_locked string
	or_block    OrExpr
//
	ct_left_value_evaled  bool
	ct_left_value         ComptTimeConstValue = empty_comptime_const_expr()
	ct_right_value_evaled bool
	ct_right_value        ComptTimeConstValue = empty_comptime_const_expr()
}

left op right See: token.Kind.is_infix

struct IntegerLiteral {
pub:
	val string
	pos token.Pos
}

struct Interface {
pub mut:
	types   []Type // all types that implement this interface
	fields  []StructField
	methods []Fn
	embeds  []Type
// `I1 is I2` conversions
	conversions map[int][]Type
// generic interface support
	is_generic     bool
	generic_types  []Type
	concrete_types []Type
	parent_type    Type
}

fn (i &Interface) find_field(name string) ?StructField

fn (i &Interface) find_method(name string) ?Fn

fn (i &Interface) has_method(name string) bool

fn (i Interface) defines_method(name string) bool

struct InterfaceDecl {
pub:
	name          string
	typ           Type
	name_pos      token.Pos
	language      Language
	field_names   []string
	is_pub        bool
	mut_pos       int // mut:
	pos           token.Pos
	pre_comments  []Comment
	generic_types []Type
	attrs         []Attr
pub mut:
	methods             []FnDecl
	fields              []StructField
	embeds              []InterfaceEmbedding
	are_embeds_expanded bool
}

struct InterfaceEmbedding {
pub:
	name     string
	typ      Type
	pos      token.Pos
	comments []Comment
}

struct IsRefType {
pub:
	is_type bool
	pos     token.Pos
pub mut:
	expr Expr // checker uses this to set typ
	typ  Type
}

struct Likely {
pub:
	pos       token.Pos
	is_likely bool // false for _unlikely_
pub mut:
	expr Expr
}

struct LockExpr {
pub:
	is_rlock []bool
	pos      token.Pos
pub mut:
	stmts    []Stmt
	lockeds  []Expr // `x`, `y.z` in `lock x, y.z {`
	comments []Comment
	is_expr  bool
	typ      Type
	scope    &Scope = unsafe { nil }
}

struct Map {
pub mut:
	key_type   Type
	value_type Type
}

struct MapInit {
pub:
	pos       token.Pos
	comments  [][]Comment // comments after key-value pairs
	pre_cmnts []Comment   // comments before the first key-value pair
pub mut:
	keys       []Expr
	vals       []Expr
	val_types  []Type
	typ        Type
	key_type   Type
	value_type Type
}

struct MatchBranch {
pub:
	ecmnts        [][]Comment // inline comments for each left side expr
	pos           token.Pos
	is_else       bool
	post_comments []Comment // comments below ´... }´
	branch_pos    token.Pos // for checker errors about invalid branches
pub mut:
	stmts []Stmt // right side
	exprs []Expr // left side
	scope &Scope = unsafe { nil }
}

struct MatchExpr {
pub:
	tok_kind token.Kind
	pos      token.Pos
	comments []Comment // comments before the first branch
pub mut:
	cond          Expr
	branches      []MatchBranch
	is_expr       bool // returns a value
	return_type   Type
	cond_type     Type // type of `x` in `match x {`
	expected_type Type // for debugging only
	is_sum_type   bool
}

struct Module {
pub:
	name       string // encoding.base64
	short_name string // base64
	attrs      []Attr
	pos        token.Pos
	name_pos   token.Pos // `name` in import name
	is_skipped bool      // module main can be skipped in single file programs
}

module declaration

struct MultiReturn {
pub mut:
	types []Type
}

struct Nil {
pub:
	pos token.Pos
}

struct NodeError {
pub:
	idx int // index for referencing the related File error
	pos token.Pos
}

struct None {
pub:
	pos token.Pos
}

struct OffsetOf {
pub:
	struct_type Type
	field       string
	pos         token.Pos
}

struct OrExpr {
pub:
	stmts []Stmt
	kind  OrKind
	pos   token.Pos
}

or { ... }

struct Param {
pub:
	pos         token.Pos
	name        string
	is_mut      bool
	is_auto_rec bool
	type_pos    token.Pos
	is_hidden   bool // interface first arg
pub mut:
	typ Type
}

struct ParExpr {
pub:
	pos token.Pos
pub mut:
	expr Expr
}

(3+4)

struct PostfixExpr {
pub:
	op            token.Kind
	pos           token.Pos
	is_c2v_prefix bool // for `--x` (`x--$`), only for translated code until c2v can handle it
pub mut:
	expr        Expr
	auto_locked string
}

++, --

struct PrefixExpr {
pub:
	op  token.Kind
	pos token.Pos
pub mut:
	right_type Type
	right      Expr
	or_block   OrExpr
	is_option  bool // IfGuard
}

See: token.Kind.is_prefix

struct RangeExpr {
pub:
	has_high bool
	has_low  bool
	pos      token.Pos
	is_gated bool // #[] gated array
pub mut:
	low  Expr
	high Expr
}

s[10..20]

struct Return {
pub:
	pos      token.Pos
	comments []Comment
pub mut:
	exprs []Expr
	types []Type
}

function return statement

struct Scope {
pub mut:
// mut:
	objects              map[string]ScopeObject
	struct_fields        map[string]ScopeStructField
	parent               &Scope = unsafe { nil }
	detached_from_parent bool
	children             []&Scope
	start_pos            int
	end_pos              int
}

fn (s &Scope) free()

fn (s &Scope) find(name string) ?ScopeObject

fn (s &Scope) find_struct_field(name string, struct_type Type, field_name string) ?ScopeStructField

selector_expr: name.field_name

fn (s &Scope) find_var(name string) ?&Var

fn (s &Scope) find_global(name string) ?&GlobalField

fn (s &Scope) find_const(name string) ?&ConstField

fn (s &Scope) known_var(name string) bool

fn (s &Scope) known_global(name string) bool

fn (s &Scope) known_const(name string) bool

fn (mut s Scope) update_var_type(name string, typ Type)

fn (mut s Scope) register_struct_field(name string, field ScopeStructField)

selector_expr: name.field_name

fn (mut s Scope) register(obj ScopeObject)

fn (s &Scope) innermost(pos int) &Scope

returns the innermost scope containing pos pub fn (s &Scope) innermost(pos int) ?&Scope {

fn (s &Scope) contains(pos int) bool

fn (s &Scope) has_inherited_vars() bool

fn (sc Scope) show(depth int, max_depth int) string

fn (sc Scope) str() string

struct ScopeStructField {
pub:
	struct_type Type // type of struct
	name        string
	pos         token.Pos
	typ         Type
	smartcasts  []Type // nested sum types require nested smart casting, for that a list of types is needed
	orig_type   Type   // original sumtype type; 0 if it's not a sumtype
// TODO: move this to a real docs site later
// 10 <- original type (orig_type)
//   [11, 12, 13] <- cast order (smartcasts)
//        12 <- the current casted type (typ)
}

used for smartcasting only struct fields change type in scopes

struct SelectBranch {
pub:
	pos           token.Pos
	comment       Comment // comment above `select {`
	is_else       bool
	is_timeout    bool
	post_comments []Comment
pub mut:
	stmt  Stmt   // `a := <-ch` or `ch <- a`
	stmts []Stmt // right side
}

struct SelectExpr {
pub:
	branches      []SelectBranch
	pos           token.Pos
	has_exception bool
pub mut:
	is_expr       bool // returns a value
	expected_type Type // for debugging only
}

struct SelectorExpr {
pub:
	pos        token.Pos
	field_name string
	is_mut     bool // is used for the case `if mut ident.selector is MyType {`, it indicates if the root ident is mutable
	mut_pos    token.Pos
	next_token token.Kind
pub mut:
	expr                Expr // expr.field_name
	expr_type           Type // type of `Foo` in `Foo.bar`
	typ                 Type // type of the entire thing (`Foo.bar`)
	name_type           Type // T in `T.name` or typeof in `typeof(expr).name`
	gkind_field         GenericKindField // `T.name` => ast.GenericKindField.name, `T.typ` => ast.GenericKindField.typ, or .unknown
	scope               &Scope = unsafe { nil }
	from_embed_types    []Type // holds the type of the embed that the method is called from
	has_hidden_receiver bool
}

foo.bar

fn (e &SelectorExpr) root_ident() ?Ident

root_ident returns the origin ident where the selector started.

struct SizeOf {
pub:
	is_type bool
	pos     token.Pos
pub mut:
	expr Expr // checker uses this to set typ
	typ  Type
}

struct SqlExpr {
pub:
	is_count   bool
	has_where  bool
	has_order  bool
	has_limit  bool
	has_offset bool
	has_desc   bool
	is_array   bool
	or_expr    OrExpr
	pos        token.Pos
pub mut:
	typ         Type
	db_expr     Expr // `db` in `sql db {`
	where_expr  Expr
	order_expr  Expr
	limit_expr  Expr
	offset_expr Expr
	table_expr  TypeNode
	fields      []StructField
	sub_structs map[int]SqlExpr
}

struct SqlStmt {
pub:
	pos     token.Pos
	db_expr Expr // `db` in `sql db {`
	or_expr OrExpr
pub mut:
	lines []SqlStmtLine
}

struct SqlStmtLine {
pub:
	kind         SqlStmtKind
	pos          token.Pos
	where_expr   Expr
	update_exprs []Expr // for `update`
pub mut:
	object_var_name string   // `user`
	updated_columns []string // for `update set x=y`
	table_expr      TypeNode
	fields          []StructField
	sub_structs     map[int]SqlStmtLine
}

struct StringInterLiteral {
pub:
	vals       []string
	fwidths    []int
	precisions []int
	pluss      []bool
	fills      []bool
	fmt_poss   []token.Pos
	pos        token.Pos
pub mut:
	exprs      []Expr
	expr_types []Type
	fmts       []u8
	need_fmts  []bool // an explicit non-default fmt required, e.g. `x`
}

'name: $name'

fn (lit &StringInterLiteral) get_fspec_braces(i int) (string, bool)

Expressions in string interpolations may have to be put in braces if they are non-trivial, if they would interfere with the next character or if a format specification is given. In the latter case the format specifier must be appended, separated by a colon: '$z $z.b $z.c.x ${x[4]} ${z:8.3f} ${a:-20} ${a>b+2}' This method creates the format specifier (including the colon) or an empty string if none is needed and also returns (as bool) if the expression must be enclosed in braces.

struct StringLiteral {
pub:
	val      string
	is_raw   bool
	language Language
	pos      token.Pos
}

struct Struct {
pub:
	attrs []Attr
pub mut:
	embeds         []Type
	fields         []StructField
	is_typedef     bool // C. [typedef]
	is_union       bool
	is_heap        bool
	is_minify      bool
	is_anon        bool
	is_generic     bool
	generic_types  []Type
	concrete_types []Type
	parent_type    Type
}

fn (s Struct) find_field(name string) ?StructField

fn (s Struct) get_field(name string) StructField

struct StructDecl {
pub:
	pos           token.Pos
	name          string
	generic_types []Type
	is_pub        bool
// _pos fields for vfmt
	mut_pos      int // mut:
	pub_pos      int // pub:
	pub_mut_pos  int // pub mut:
	global_pos   int // __global:
	module_pos   int // module:
	language     Language
	is_union     bool
	attrs        []Attr
	end_comments []Comment
	embeds       []Embed
pub mut:
	fields []StructField
}

struct StructField {
pub:
	pos              token.Pos
	type_pos         token.Pos
	comments         []Comment
	i                int
	has_default_expr bool
	attrs            []Attr
	is_pub           bool
	default_val      string
	is_mut           bool
	is_global        bool
	is_volatile      bool
	is_deprecated    bool
pub mut:
	default_expr     Expr
	default_expr_typ Type
	name             string
	typ              Type
	anon_struct_decl StructDecl // only if the field is an anonymous struct
}

fn (f &StructField) equals(o &StructField) bool

struct StructInit {
pub:
	pos             token.Pos
	name_pos        token.Pos
	no_keys         bool // `Foo{val1, val2}`
	is_short_syntax bool // `foo(field1: val1, field2: val2)`
	is_anon         bool //  `x: struct{ foo: bar }`
pub mut:
	unresolved           bool
	pre_comments         []Comment
	typ_str              string // 'Foo'
	typ                  Type   // the type of this struct
	update_expr          Expr   // `a` in `...a`
	update_expr_type     Type
	update_expr_comments []Comment
	is_update_embed      bool
	has_update_expr      bool // has `...a`
	fields               []StructInitField
	embeds               []StructInitEmbed
	generic_types        []Type
}

s := Foo{ ...a field1: 'hello' }

struct StructInitEmbed {
pub:
	pos           token.Pos
	comments      []Comment
	next_comments []Comment
pub mut:
	expr          Expr
	name          string
	typ           Type
	expected_type Type
}

struct StructInitField {
pub:
	pos           token.Pos
	name_pos      token.Pos
	comments      []Comment
	next_comments []Comment
pub mut:
	expr          Expr   // `val1`
	name          string // 'field1'
	typ           Type   // the type of this field
	expected_type Type
	parent_type   Type
}

field1: val1

struct SumType {
pub mut:
	fields       []StructField
	found_fields bool
	is_anon      bool
// generic sumtype support
	is_generic     bool
	variants       []Type
	generic_types  []Type
	concrete_types []Type
	parent_type    Type
}

fn (s &SumType) find_field(name string) ?StructField

struct SumTypeDecl {
pub:
	name          string
	is_pub        bool
	pos           token.Pos
	name_pos      token.Pos
	comments      []Comment
	typ           Type
	generic_types []Type
	attrs         []Attr // attributes of type declaration
pub mut:
	variants []TypeNode
}

SumTypeDecl is the ast node for type MySumType = string | int

struct Table {
mut:
	parsing_type string // name of the type to enable recursive type parsing
pub mut:
	type_symbols       []&TypeSymbol
	type_idxs          map[string]int
	fns                map[string]Fn
	iface_types        map[string][]Type
	dumps              map[int]string // needed for efficiently generating all _v_dump_expr_TNAME() functions
	imports            []string       // List of all imports
	modules            []string       // Topologically sorted list of all modules registered by the application
	global_scope       &Scope = unsafe { nil }
	cflags             []cflag.CFlag
	redefined_fns      []string
	fn_generic_types   map[string][][]Type // for generic functions
	interfaces         map[int]InterfaceDecl
	cmod_prefix        string // needed for ast.type_to_str(Type) while vfmt; contains `os.`
	is_fmt             bool
	used_fns           map[string]bool // filled in by the checker, when pref.skip_unused = true;
	used_consts        map[string]bool // filled in by the checker, when pref.skip_unused = true;
	used_globals       map[string]bool // filled in by the checker, when pref.skip_unused = true;
	used_vweb_types    []Type // vweb context types, filled in by checker, when pref.skip_unused = true;
	used_maps          int    // how many times maps were used, filled in by checker, when pref.skip_unused = true;
	panic_handler      FnPanicHandler = default_table_panic_handler
	panic_userdata     voidptr        = unsafe { nil } // can be used to pass arbitrary data to panic_handler;
	panic_npanics      int
	cur_fn             &FnDecl = unsafe { nil } // previously stored in Checker.cur_fn and Gen.cur_fn
	cur_concrete_types []Type  // current concrete types, e.g. 
	gostmts            int     // how many `go` statements there were in the parsed files.
// When table.gostmts > 0, __VTHREADS__ is defined, which can be checked with `$if threads {`
	enum_decls        map[string]EnumDecl
	module_deprecated map[string]bool
	module_attrs      map[string][]Attr // module attributes
	builtin_pub_fns   map[string]bool
	pointer_size      int
// cache for type_to_str_using_aliases
	cached_type_to_str map[u64]string
	anon_struct_names  map[string]int // anon struct name -> struct sym idx
// counter for anon struct, avoid name conflicts.
	anon_struct_counter int
}

fn (mut t Table) add_placeholder_type(name string, language Language) int

fn (t &Table) array_cname(elem_type Type) string

fn (t &Table) array_fixed_cname(elem_type Type, size int) string

fn (t &Table) array_fixed_name(elem_type Type, size int, size_expr Expr) string

array_fixed_source_name generates the original name for the v source.
e. g. [16][8]int

fn (t &Table) array_name(elem_type Type) string

array_source_name generates the original name for the v source.
e. g. []int

fn (mut t Table) bitsize_to_type(bit_size int) Type

bitsize_to_type returns a type corresponding to the bit_size Examples:

8 > i8

32 > int

123 > panic()

128 > [16]u8

608 > [76]u8

fn (t &Table) chan_cname(elem_type Type, is_mut bool) string

fn (t &Table) chan_name(elem_type Type, is_mut bool) string

fn (t &Table) clean_generics_type_str(typ Type) string

clean type name from generics form. From Type<int> -> Type

fn (mut t Table) complete_interface_check()

complete_interface_check does a MxN check for all M interfaces vs all N types, to determine what types implement what interfaces.
It short circuits most checks when an interface can not possibly be implemented by a type.

fn (t &Table) dependent_names_in_expr(expr Expr) []string

fn (t &Table) dependent_names_in_stmt(stmt Stmt) []string

fn (t Table) does_type_implement_interface(typ Type, inter_typ Type) bool

fn (t &Table) final_sym(typ Type) &TypeSymbol

final_sym follows aliases until it gets to a "real" Type

fn (t &Table) find_field(s &TypeSymbol, name string) ?StructField

search from current type up through each parent looking for field

fn (t &Table) find_field_from_embeds(sym &TypeSymbol, field_name string) ?(StructField, []Type)

find_field_from_embeds tries to find a field in the nested embeds

fn (t &Table) find_field_with_embeds(sym &TypeSymbol, field_name string) ?StructField

find_field_with_embeds searches for a given field, also looking through embedded fields

fn (t &Table) find_fn(name string) ?Fn

fn (t &Table) find_method(s &TypeSymbol, name string) ?Fn

find_method searches from current type up through each parent looking for method

fn (t &Table) find_method_from_embeds(sym &TypeSymbol, method_name string) ?(Fn, []Type)

fn (t &Table) find_method_with_embeds(sym &TypeSymbol, method_name string) ?Fn

find_method_with_embeds searches for a given method, also looking through embedded fields

fn (mut t Table) find_or_register_array(elem_type Type) int

fn (mut t Table) find_or_register_array_fixed(elem_type Type, size int, size_expr Expr) int

fn (mut t Table) find_or_register_array_with_dims(elem_type Type, nr_dims int) int

fn (mut t Table) find_or_register_chan(elem_type Type, is_mut bool) int

fn (mut t Table) find_or_register_fn_type(f Fn, is_anon bool, has_decl bool) int

fn (mut t Table) find_or_register_map(key_type Type, value_type Type) int

fn (mut t Table) find_or_register_multi_return(mr_typs []Type) int

fn (mut t Table) find_or_register_promise(return_type Type) int

fn (mut t Table) find_or_register_thread(return_type Type) int

fn (t &Table) find_sym(name string) ?&TypeSymbol