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cbuffer_parser.js
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cbuffer_parser.js
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const scalar_typenames = [
"float16_t", "float32_t", "float64_t",
/*"int8_t", "uint8_t",*/ "int16_t", "uint16_t", "int32_t", "uint32_t", "int64_t", "uint64_t",
"float", "int", "uint", "double", "bool", // NOTE: put these at the bottom since the previous ones have these as prefixes
"min12int", "min16int", "min16uint", "min10float", "min16float", "half"
];
const typenames_unsupported = [
"min12int", "min16int", "min16uint", "min10float", "min16float", "half"
];
const keywords_unsupported = [ // TODO: support these keywords
"define", "packoffset", "uniform", "pragma", "pack_matrix"
];
const tokens_unsupported = [
'#'
];
// TODO: for packoffset:
// - save "forced offset" in parser
// - first pass through layouting saves all forced offset variables in one array
// - whenever we layout the next variable, we need to loop through all forced offset vars to figure out whether we need to pad
// - whenever we calculate padding, we loop through all forced offset variables in addition to the last non-forced variable
// - this is based on an incomplete understanding of packoffset, make some examples and check how they affect padding
// - maybe we can do one pass layouting *only* the forced offset vars and then a second pass doing everything else? like a "shadow struct" overlaid on top?
export const TokenType = {
Identifier: "identifier",
Number: "number",
Keywords: {
CBuffer: "cbuffer", // NOTE: these must exactly match the keywords, at least on the right side
Struct: "struct",
Column_Major: "column_major",
Row_Major: "row_major",
ConstantBuffer: "ConstantBuffer",
StructuredBuffer: "StructuredBuffer",
Register: "register",
Typedef: "typedef",
// Define: "define",
// PackOffset: "packoffset",
// Uniform: "uniform",
// Pragma: "pragma",
// Pack_Matrix: "pack_matrix"
},
'(': '(',
')': ')',
'{': '{',
'}': '}',
'[': '[',
']': ']',
'<': '<',
'>': '>',
',': ',',
';': ';',
':': ':',
'#': '#'
};
export function GetSupportedKeywords() {
let ret = [];
for (const [key, value] of Object.entries(TokenType.Keywords)) {
ret.push(value);
}
return ret;
}
function GetKeyByValue(object, value) {
return Object.keys(object).find(key => object[key] === value);
}
function IsDigit(c) {
return c[0] >= '0' && c[0] <= '9';
}
export class HLSLError {
constructor(message, line, start_column, end_column = start_column + 1) {
this.message = message;
this.line = line;
this.start_column = start_column;
this.end_column = end_column;
}
static CreateFromToken(message, token) {
return new HLSLError(message, token.line, token.column, token.column + token.value.length);
}
};
export class Token {
constructor(type, value, line, column) {
this.type = type;
this.value = value;
this.line = line;
this.column = column;
}
};
export class Lexer {
constructor(input) {
this.input = input;
this.index = -1;
this.line = 1;
this.column = 0;
this.curstring = "";
}
SkipWhitespace() {
let char = '\0';
do {
char = this.PeekNext();
} while (/\s/.test(char) && this.Consume());
}
SkipLineComment() {
let char = '\0';
do {
char = this.GetNext();
} while (char != '\n' && char != '\0');
}
SkipMultiLineComment() {
while (true) {
let char = this.GetNext();
let next = this.PeekNext();
if (char == '*' && next == '/') {
this.Consume();
return true;
}
else if (next == '\0')
return false;
}
return false;
}
GetNext() {
if (this.CharactersLeft() > 0) {
return this.Consume();
}
return '\0';
}
PeekNext() {
if (this.CharactersLeft() > 0)
return this.input[this.index + 1];
return '\0';
}
Consume() {
this.index++;
this.curstring = this.input.slice(this.index);
let char = this.input[this.index];
this.column++;
if (char == '\n') {
this.line += 1;
this.column = 0;
}
return char;
}
CharactersLeft() {
let ret = this.input.length - this.index - 1;
return ret;
}
MakeToken(type, value, column = this.column) {
return new Token(type, value, this.line, column);
}
GetAllTokens() {
let tokens = [];
while (this.CharactersLeft() > 0) {
this.SkipWhitespace();
if (this.CharactersLeft() == 0)
return tokens;
let char = this.GetNext(); // NOTE: in hindsight, this almost certainly should have been a Peek, but it works now so I'm leaving it
if (TokenType.hasOwnProperty(char)) { // single character tokens like (){}[],;
tokens.push(this.MakeToken(char, char));
}
else if (char == '/') {
if (this.CharactersLeft() < 1)
throw new HLSLError(`unexpected token at end of input ${char}`, this.line, this.column);
let next = this.GetNext();
if (next == '/')
this.SkipLineComment();
else if (next == '*') {
let start_column = this.column;
let start_line = this.line;
if (!this.SkipMultiLineComment())
throw new HLSLError(`unterminated multi-line comment`, start_line, start_column);
}
else {
throw new HLSLError(`unexpected token ${char}${next}`, this.line, this.column);
}
}
else {
let token = "";
let start_column = this.column;
let is_number = false;
if (/\d/.test(char)) { // number
is_number = true;
do {
token += char;
char = this.PeekNext();
} while (/\d/.test(char) && this.Consume()); // aaaaaaaaaaaaaaaaa
}
else if (/\w/.test(char)) { // identifier/keyword
do {
token += char;
char = this.PeekNext();
} while (/\w/.test(char) && this.Consume()); // aaaaaaaaaaaaaaaaa
}
if (token != "") {
if (is_number)
tokens.push(this.MakeToken(TokenType.Number, token, start_column));
else if (GetKeyByValue(TokenType.Keywords, token))
tokens.push(this.MakeToken(token, token, start_column));
else
tokens.push(this.MakeToken(TokenType.Identifier, token, start_column));
}
else {
throw new HLSLError(`invalid or unexpected token ${char}`, this.line, start_column);
}
}
}
return tokens;
}
};
export class MemberVariable {
constructor(type, name) {
this.type = type;
this.name = name;
this.isCBuffer = false;
this.isSBuffer = false;
}
};
export class StructType {
constructor(name, members) {
this.name = name;
this.members = members;
}
};
export class ArrayType {
constructor(elementType, arraySize, created_from_matrix = false) {
this.elementType = elementType;
this.arraySize = arraySize;
this.name = `${elementType.name}[${arraySize}]`;
this.created_from_matrix = created_from_matrix;
}
};
export class BuiltinType {
constructor(name, elementsize, alignment, vectorsize, created_from_matrix = false) {
this.name = name;
this.elementsize = elementsize;
this.alignment = alignment;
this.vectorsize = (vectorsize == undefined) ? 1 : vectorsize;
this.created_from_matrix = created_from_matrix;
}
static Create(type, vectorsize, force_c_types, created_from_matrix = false) {
if (type == "bool" && force_c_types) // rename "bool" to "BOOL" for C layout to indicate 4 byte type
type = "BOOL";
let t = types_builtin[type];
return new BuiltinType(vectorsize == 1 ? t.name : t.name + vectorsize, t.elementsize, t.alignment, vectorsize, created_from_matrix);
}
};
class Typedef {
constructor(type, name) {
this.type = type;
this.name = name;
}
};
const types_builtin = {
"float": new BuiltinType("float", 4, 4),
"float16_t": new BuiltinType("float16_t", 2, 2),
"float32_t": new BuiltinType("float32_t", 4, 4),
"float64_t": new BuiltinType("float64_t", 8, 8),
//"int8_t" : new BuiltinType("int8_t" , 1, 1),
//"uint8_t" : new BuiltinType("uint8_t" , 1, 1),
"int16_t": new BuiltinType("int16_t", 2, 2),
"uint16_t": new BuiltinType("uint16_t", 2, 2),
"int32_t": new BuiltinType("int32_t", 4, 4),
"uint32_t": new BuiltinType("uint32_t", 4, 4),
"int64_t": new BuiltinType("int64_t", 8, 8),
"uint64_t": new BuiltinType("uint64_t", 8, 8),
"float": new BuiltinType("float", 4, 4),
"int": new BuiltinType("int", 4, 4),
"uint": new BuiltinType("uint", 4, 4),
"double": new BuiltinType("double", 8, 8),
"bool": new BuiltinType("bool", 4, 4),
"BOOL": new BuiltinType("BOOL", 4, 4), // NOTE: for C layouts
};
export class Parser {
constructor(lexer, force_c_types) {
this.index = -1;
this.lexer = lexer;
this.tokens = lexer.GetAllTokens();
this.curToken = null;
this.nextToken = this.tokens[this.index + 1] ?? null;
this.buffers = [];
this.typedefs = [];
this.counter = 0;
this.force_c_types = force_c_types;
}
GetNext() {
return this.Consume();
}
PeekNext() {
return this.nextToken;
}
Consume() {
this.index++;
this.curToken = this.tokens[this.index] ?? null;
this.nextToken = this.tokens[this.index + 1] ?? null;
return this.curToken;
}
Unconsume() {
this.index--;
this.curToken = this.tokens[this.index] ?? null;
this.nextToken = this.tokens[this.index + 1] ?? null;
return this.curToken;
}
TokensLeft() {
let ret = this.tokens.length - this.index - 1;
return ret;
}
CheckSupport(token) {
if (keywords_unsupported.indexOf(token.value) != -1)
throw HLSLError.CreateFromToken(`unsupported keyword '${token.value}'`, token);
else if (tokens_unsupported.indexOf(token.type) != -1)
throw HLSLError.CreateFromToken(`unsupported token ${token.type}`, token);
}
ExpectAny(...types) {
let ret = null;
for (let t of types) {
if (ret = this.Accept(t))
return ret;
}
// error
let lastToken = this.curToken;
let token = this.nextToken;
let error = "expected ";
for (let t of types) {
error += `${t} or `;
}
error = error.substring(0, error.length - 4); // remove superfluous " or "
let lastToken_str = lastToken ? ` after '${lastToken.value}' (line ${lastToken.line})` : "";
let token_str = "";
if (!token)
token_str = "end of file";
else if (token.type == TokenType.Identifier || token.type == TokenType.Number)
token_str = `${token.type} '${token.value}'`;
else
token_str = `${token.type}`;
error += `${lastToken_str} but got ${token_str}`;
if (!token)
throw new HLSLError(error, this.lexer.line, 1, this.lexer.input.length - this.lexer.input.lastIndexOf('\n'));
else
throw HLSLError.CreateFromToken(error, token);
}
Expect(type) {
let lastToken = this.curToken;
let token = this.GetNext();
if (!token)
throw new HLSLError(`expected ${type}, but got end of file`, this.lexer.line, 1, this.lexer.input.length - this.lexer.input.lastIndexOf('\n'));
this.CheckSupport(token);
if (token.type != type) {
let lastToken_str = lastToken ? ` after '${lastToken.value}' (line ${lastToken.line})` : "";
if (token.type == TokenType.Identifier || token.type == TokenType.Number)
throw HLSLError.CreateFromToken(`expected ${type}${lastToken_str} but got ${token.type} '${token.value}'`, token);
else
throw HLSLError.CreateFromToken(`expected ${type}${lastToken_str} but got ${token.type}`, token);
}
return token;
}
AcceptAny(...types) {
let ret = null;
for (let t of types) {
if (ret = this.Accept(t))
return ret;
}
return ret;
}
Accept(type) {
let token = this.PeekNext();
if (!token)
return null;
this.CheckSupport(token);
if (token.type != type)
return null;
return this.Consume();
}
MakeAnonymousName() {
return "_anon" + this.counter++;
}
ParseInteger() {
let str = this.Expect(TokenType.Number).value;
if (String(Number(str)) != str)
throw HLSLError.CreateFromToken(`invalid integer ${str}`, this.curToken);
return Number(str);
}
CheckSize(size, sizestr, name, min = 1, max = 4) {
if (!(size >= min && size <= max)) // negated test to catch NaN
throw HLSLError.CreateFromToken(`invalid ${name} '${sizestr}' (must be between ${min} and ${max} inclusive)`, this.curToken);
}
AddTypedef(type, name) {
if (this.typedefs.find((e) => e.name == name)) {
throw HLSLError.CreateFromToken(`redefinition of type '${name}'`, this.curToken);
}
this.typedefs.push(new Typedef(type, name));
}
ParseOptionalRegisterBinding() {
if (this.Accept(':')) {
this.Expect(TokenType.Keywords.Register);
this.Expect('(');
this.Expect(TokenType.Identifier); // not going to check whether this is a correct register, we're not a compiler
if (this.Accept(','))
this.Expect(TokenType.Identifier); // same here
this.Expect(')');
}
}
ParseFile() {
do {
let token_type = this.ExpectAny(
TokenType.Keywords.Struct,
TokenType.Keywords.CBuffer,
TokenType.Keywords.ConstantBuffer,
TokenType.Keywords.StructuredBuffer,
TokenType.Keywords.Typedef).type;
if (token_type == TokenType.Keywords.Typedef) {
let local_typedefs = [];
this.ParseMemberVariableIntoArray(local_typedefs); // typedefs are syntactically like member variable declarations you can have multiple names using comma
for (let t of local_typedefs) {
AddTypedef(t.type, t.name);
}
}
else { // type / variable declaration (struct, cbuffer, ConstantBuffer, StructuredBuffer)
let type_declaration = null;
let variable_name_token = null;
// ConstantBuffer<T>, where T must be a previously defined struct (not inline, not a scalar/vector, etc.)
if (token_type == TokenType.Keywords.ConstantBuffer) {
this.Expect('<');
let template_type_name_token = this.Expect(TokenType.Identifier);
type_declaration = this.typedefs.find((element) => element.name == template_type_name_token.value)?.type;
if (!type_declaration) {
// try to see if it's a valid type name, but not a struct
this.Unconsume();
type_declaration = this.ParseNonStructType();
if (!type_declaration)
throw HLSLError.CreateFromToken(`cannot find type named '${template_type_name_token.value}'`, template_type_name_token);
}
if (!(type_declaration instanceof StructType))
throw HLSLError.CreateFromToken(`template type '${template_type_name_token.value}' must be a struct type (is '${type_declaration.constructor.name}')`, template_type_name_token);
this.Expect('>');
variable_name_token = this.Expect(TokenType.Identifier);
while (this.Accept('[')) {
this.ParseInteger();
this.Expect(']');
}
this.ParseOptionalRegisterBinding();
// make things slightly more consistent between cbuffer and ConstantBuffer by making an inner struct declaration
type_declaration = new StructType(variable_name_token.value, [new MemberVariable(type_declaration, "")]);
}
else if (token_type == TokenType.Keywords.StructuredBuffer) { // StructuredBuffer<T>, accepts any type T except inline struct definitions
this.Expect('<');
let template_type = this.ParseNonStructType(); // NOTE: unlike the name implies, this can still return a struct type defined elsewhere, just not inline structs
if (!template_type)
throw HLSLError.CreateFromToken(`cannot find type named '${this.curToken.value}'`, this.curToken);
this.Expect('>');
variable_name_token = this.Expect(TokenType.Identifier);
while (this.Accept('[')) {
this.ParseInteger();
this.Expect(']');
}
this.ParseOptionalRegisterBinding();
// put template type into outer struct for the buffer
type_declaration = new StructType(variable_name_token.value, [new MemberVariable(template_type, "")]);
}
else if (token_type == TokenType.Keywords.Struct) { // struct declaration
type_declaration = this.ParseStructTypeDeclaration(true);
variable_name_token = this.Accept(TokenType.Identifier);
while (this.Accept('[')) {
this.ParseInteger();
this.Expect(']');
}
}
else if (token_type == TokenType.Keywords.CBuffer) { // cbuffer declaration
type_declaration = this.ParseStructTypeDeclaration(true, true);
}
this.Expect(';');
if (token_type == TokenType.Keywords.CBuffer || token_type == TokenType.Keywords.ConstantBuffer || token_type == TokenType.Keywords.StructuredBuffer) {
// treat top level declarations as "member variables" of the global scope so we can get their variable names
let global_member = new MemberVariable(type_declaration, variable_name_token ? variable_name_token.value : "");
global_member.isCBuffer = (token_type == TokenType.Keywords.CBuffer || token_type == TokenType.Keywords.ConstantBuffer);
global_member.isSBuffer = token_type == TokenType.Keywords.StructuredBuffer;
this.buffers.push(global_member);
}
}
} while (this.TokensLeft() > 0);
return this.buffers;
}
ParseStructTypeDeclaration(is_top_level = false, is_cbuffer = false) {
let type_name = is_top_level ? this.Expect(TokenType.Identifier).value : this.Accept(TokenType.Identifier)?.value;
if (is_cbuffer)
this.ParseOptionalRegisterBinding();
this.Expect('{');
let members = [];
while (!this.Accept('}')) {
this.ParseMemberVariableIntoArray(members);
}
let struct = new StructType(type_name ?? this.MakeAnonymousName(), members);
if (!is_cbuffer && type_name) {
// TODO: Technically I'd need to know the parent and use Parent::Child as name for the typedef if applicable, but the code is already complicated enough.
// For lookup I'd also need to do the locally nested types first, they have precedence over global definitions.
this.AddTypedef(struct, struct.name);
}
return struct;
}
ParseMemberVariableIntoArray(members) {
let member_type = this.ParseMemberType();
if (!member_type)
throw HLSLError.CreateFromToken(`cannot find type named '${this.curToken.value}'`, this.curToken);
do {
let member_name = this.Expect(TokenType.Identifier).value;
if (this.Accept('[')) {
let array_type = this.ParseArrayType(member_type);
members.push(new MemberVariable(array_type, member_name));
}
else {
members.push(new MemberVariable(member_type, member_name));
}
} while (this.Accept(','));
this.Expect(';');
}
ParseMemberType() {
if (this.Accept(TokenType.Keywords.Struct)) // inner structs
return this.ParseStructTypeDeclaration();
else
return this.ParseNonStructType();
}
ParseNonStructTypeImpl(is_row_major) {
let name = this.Expect(TokenType.Identifier).value;
if (name == "matrix" || name == "vector") {
return this.ParseTemplateType(name, is_row_major);
}
for (let t of scalar_typenames) {
if (name.startsWith(t)) {
if (name == t) {
if (typenames_unsupported.indexOf(t) != -1) throw HLSLError.CreateFromToken(`unsupported type '${this.curToken.value}'`, this.curToken);
return BuiltinType.Create(t, 1, this.force_c_types);
}
let suffix = name.substring(t.length);
if (suffix.length == 1 && IsDigit(suffix[0])) {
let vectorsize = Number(suffix[0]);
this.CheckSize(vectorsize, suffix[0], "vector size");
if (typenames_unsupported.indexOf(t) != -1) throw HLSLError.CreateFromToken(`unsupported type '${this.curToken.value}'`, this.curToken);
return BuiltinType.Create(t, vectorsize, this.force_c_types);
}
else if (suffix.length == 3 && IsDigit(suffix[0]) && suffix[1] == 'x' && IsDigit(suffix[2])) {
let rows = Number(suffix[0]);
let cols = Number(suffix[2]);
this.CheckSize(rows, suffix[0], "matrix row size");
this.CheckSize(cols, suffix[2], "matrix column size");
let vectorsize = is_row_major ? cols : rows;
let arraysize = is_row_major ? rows : cols;
if (typenames_unsupported.indexOf(t) != -1) throw HLSLError.CreateFromToken(`unsupported type '${this.curToken.value}'`, this.curToken);
let vector_type = BuiltinType.Create(t, vectorsize, this.force_c_types, true);
if (arraysize == 1)
return vector_type; // typeNx1 matrices are layout equivalent to just typeN, not typeN[1]
else
return new ArrayType(vector_type, arraysize, true);
}
}
}
return this.typedefs.find((element) => element.name == name)?.type;
}
ParseNonStructType() {
let matrix_orientation = this.AcceptAny(TokenType.Keywords.Row_Major, TokenType.Keywords.Column_Major);
// NOTE: we already default to column major
// TODO: allow emulating compiler flags / #pragma to change default
let is_row_major = matrix_orientation && matrix_orientation.type == TokenType.Keywords.Row_Major;
//let is_column_major = matrix_orientation && matrix_orientation.type == TokenType.Keywords.Column_Major;
let type = this.ParseNonStructTypeImpl(is_row_major);
// I need to do this check with a boolean tag instead of a separate MatrixType because a matrix can be equivalent to either an array or vector and I want to not change all the code down the line
if (matrix_orientation && !type.created_from_matrix)
throw HLSLError.CreateFromToken(`cannot define ${matrix_orientation.type} for non-matrix type ${type.name}`, matrix_orientation);
return type;
}
ParseTemplateType(name, is_row_major) {
// template type arguments are optional and default to the following:
let scalar_type = "float";
let vectorsize = 4;
let arraysize = 4;
let is_matrix = (name == "matrix");
if (this.Accept('<')) {
let id = this.Expect(TokenType.Identifier).value;
scalar_type = scalar_typenames.find((t) => t == id);
if (!scalar_type) {
let corrected = scalar_typenames.find((t) => id.includes(t));
throw HLSLError.CreateFromToken(`invalid scalar type '${id}'${corrected ? ", did you mean " + corrected + "?" : ""}`, this.curToken);
}
if (this.Accept(',')) {
vectorsize = this.ParseInteger();
this.CheckSize(vectorsize, this.curToken.value, is_matrix ? "matrix row size" : "vector size");
}
if (is_matrix && this.Accept(',')) {
arraysize = this.ParseInteger();
this.CheckSize(arraysize, this.curToken.value, "matrix column size");
}
this.Expect('>');
}
if (is_matrix) {
if (is_row_major) {
let tmp = vectorsize;
vectorsize = arraysize;
arraysize = tmp;
}
let vector_type = BuiltinType.Create(scalar_type, vectorsize, this.force_c_types, true);
if (arraysize == 1)
return vector_type; // typeNx1 matrices are layout equivalent to just typeN, not typeN[1]
else
return new ArrayType(vector_type, arraysize, true);
}
else {
return BuiltinType.Create(scalar_type, vectorsize, this.force_c_types);
}
}
ParseArrayType(member_type) {
let arraysize = 1;
do { // NOTE: we just treat multi-dimensional arrays as one-dimensional, makes everything massively easier
arraysize *= this.ParseInteger();
this.CheckSize(arraysize, this.curToken.value, "array size", 1, 4096);
this.Expect(']');
} while (this.Accept('['));
let array_type = new ArrayType(member_type, arraysize);
return array_type;
}
};