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Add `expression` into the WGSL parser. 

The parser skipped over the `expression` node and went straight
to `logical_or_expression`. This CL adds `expression` which just
calls `logical_or_expression`. This will allow moving the rest of the
parser to more closely match the WGSL spec.

Bug: tint:1633

Change-Id: I994a186ea50f3b3196c9ded77d9c478cb08b019b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/98220
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
This commit is contained in:
dan sinclair 2022-08-04 21:06:07 +00:00 committed by Dawn LUCI CQ
parent cd0622c823
commit 737fd8223e
2 changed files with 38 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
src/tint/reader/wgsl/parser_impl.cc
View File

@ -581,7 +581,7 @@ Maybe<bool> ParserImpl::global_decl() {
// global_variable_decl
// : variable_attribute_list* variable_decl
// | variable_attribute_list* variable_decl EQUAL const_expr
// | variable_attribute_list* variable_decl EQUAL expression
Maybe<const ast::Variable*> ParserImpl::global_variable_decl(AttributeList& attrs) {
auto decl = variable_decl();
if (decl.errored) {
@ -593,7 +593,7 @@ Maybe<const ast::Variable*> ParserImpl::global_variable_decl(AttributeList& attr
const ast::Expression* initializer = nullptr;
if (match(Token::Type::kEqual)) {
auto expr = logical_or_expression();
auto expr = expression();
if (expr.errored) {
return Failure::kErrored;
}
@ -653,7 +653,7 @@ Maybe<const ast::Variable*> ParserImpl::global_constant_decl(AttributeList& attr
const ast::Expression* initializer = nullptr;
if (has_initializer) {
auto expr = logical_or_expression();
auto expr = expression();
if (expr.errored) {
return Failure::kErrored;
}
@ -1374,13 +1374,15 @@ Expect<ast::StructMember*> ParserImpl::expect_struct_member() {
decl->type, std::move(attrs.value));
}
// static_assert
// : STATIC_ASSERT expression
Maybe<const ast::StaticAssert*> ParserImpl::static_assert_stmt() {
Source start;
if (!match(Token::Type::kStaticAssert, &start)) {
return Failure::kNoMatch;
}
auto condition = logical_or_expression();
auto condition = expression();
if (condition.errored) {
return Failure::kErrored;
}
@ -1583,10 +1585,10 @@ Expect<ast::BlockStatement*> ParserImpl::expect_body_stmt() {
}
// paren_expression
// : PAREN_LEFT logical_or_expression PAREN_RIGHT
// : PAREN_LEFT expression PAREN_RIGHT
Expect<const ast::Expression*> ParserImpl::expect_paren_expression() {
return expect_paren_block("", [&]() -> Expect<const ast::Expression*> {
auto expr = logical_or_expression();
auto expr = expression();
if (expr.errored) {
return Failure::kErrored;
}
@ -1791,7 +1793,7 @@ Maybe<const ast::Statement*> ParserImpl::non_block_statement() {
}
// return_stmt
// : RETURN logical_or_expression?
// : RETURN expression?
Maybe<const ast::ReturnStatement*> ParserImpl::return_stmt() {
Source source;
if (!match(Token::Type::kReturn, &source)) {
@ -1802,7 +1804,7 @@ Maybe<const ast::ReturnStatement*> ParserImpl::return_stmt() {
return create<ast::ReturnStatement>(source, nullptr);
}
auto expr = logical_or_expression();
auto expr = expression();
if (expr.errored) {
return Failure::kErrored;
}
@ -1813,8 +1815,8 @@ Maybe<const ast::ReturnStatement*> ParserImpl::return_stmt() {
// variable_stmt
// : variable_decl
// | variable_decl EQUAL logical_or_expression
// | CONST variable_ident_decl EQUAL logical_or_expression
// | variable_decl EQUAL expression
// | CONST variable_ident_decl EQUAL expression
Maybe<const ast::VariableDeclStatement*> ParserImpl::variable_stmt() {
if (match(Token::Type::kConst)) {
auto decl = expect_variable_ident_decl("'const' declaration",
@ -1827,7 +1829,7 @@ Maybe<const ast::VariableDeclStatement*> ParserImpl::variable_stmt() {
return Failure::kErrored;
}
auto initializer = logical_or_expression();
auto initializer = expression();
if (initializer.errored) {
return Failure::kErrored;
}
@ -1855,7 +1857,7 @@ Maybe<const ast::VariableDeclStatement*> ParserImpl::variable_stmt() {
return Failure::kErrored;
}
auto initializer = logical_or_expression();
auto initializer = expression();
if (initializer.errored) {
return Failure::kErrored;
}
@ -1882,7 +1884,7 @@ Maybe<const ast::VariableDeclStatement*> ParserImpl::variable_stmt() {
const ast::Expression* initializer = nullptr;
if (match(Token::Type::kEqual)) {
auto initializer_expr = logical_or_expression();
auto initializer_expr = expression();
if (initializer_expr.errored) {
return Failure::kErrored;
}
@ -1926,7 +1928,7 @@ Maybe<const ast::IfStatement*> ParserImpl::if_stmt() {
return Failure::kNoMatch;
}
auto condition = logical_or_expression();
auto condition = expression();
if (condition.errored) {
return Failure::kErrored;
}
@ -1987,14 +1989,14 @@ Maybe<const ast::IfStatement*> ParserImpl::if_stmt() {
}
// switch_stmt
// : SWITCH paren_expression BRACKET_LEFT switch_body+ BRACKET_RIGHT
// : SWITCH expression BRACKET_LEFT switch_body+ BRACKET_RIGHT
Maybe<const ast::SwitchStatement*> ParserImpl::switch_stmt() {
Source source;
if (!match(Token::Type::kSwitch, &source)) {
return Failure::kNoMatch;
}
auto condition = logical_or_expression();
auto condition = expression();
if (condition.errored) {
return Failure::kErrored;
}
@ -2210,7 +2212,7 @@ Maybe<const ast::Statement*> ParserImpl::for_header_continuing() {
// for_header
// : (variable_stmt | assignment_stmt | func_call_stmt)?
// SEMICOLON
// logical_or_expression? SEMICOLON
// expression? SEMICOLON
// (assignment_stmt | func_call_stmt)?
Expect<std::unique_ptr<ForHeader>> ParserImpl::expect_for_header() {
auto initializer = for_header_initializer();
@ -2222,7 +2224,7 @@ Expect<std::unique_ptr<ForHeader>> ParserImpl::expect_for_header() {
return Failure::kErrored;
}
auto condition = logical_or_expression();
auto condition = expression();
if (condition.errored) {
return Failure::kErrored;
}
@ -2270,7 +2272,7 @@ Maybe<const ast::WhileStatement*> ParserImpl::while_stmt() {
return Failure::kNoMatch;
}
auto condition = logical_or_expression();
auto condition = expression();
if (condition.errored) {
return Failure::kErrored;
}
@ -2420,7 +2422,7 @@ Maybe<const ast::Expression*> ParserImpl::primary_expression() {
// postfix_expression
// :
// | BRACE_LEFT logical_or_expression BRACE_RIGHT postfix_expr
// | BRACE_LEFT expression BRACE_RIGHT postfix_expr
// | PERIOD IDENTIFIER postfix_expr
Maybe<const ast::Expression*> ParserImpl::postfix_expression(const ast::Expression* prefix) {
Source source;
@ -2428,7 +2430,7 @@ Maybe<const ast::Expression*> ParserImpl::postfix_expression(const ast::Expressi
while (continue_parsing()) {
if (match(Token::Type::kBracketLeft, &source)) {
auto res = sync(Token::Type::kBracketRight, [&]() -> Maybe<const ast::Expression*> {
auto param = logical_or_expression();
auto param = expression();
if (param.errored) {
return Failure::kErrored;
}
@ -2484,14 +2486,14 @@ Maybe<const ast::Expression*> ParserImpl::singular_expression() {
}
// argument_expression_list
// : PAREN_LEFT ((logical_or_expression COMMA)* logical_or_expression COMMA?)?
// : PAREN_LEFT ((expression COMMA)* expression COMMA?)?
// PAREN_RIGHT
Expect<ParserImpl::ExpressionList> ParserImpl::expect_argument_expression_list(
std::string_view use) {
return expect_paren_block(use, [&]() -> Expect<ExpressionList> {
ExpressionList ret;
while (continue_parsing()) {
auto arg = logical_or_expression();
auto arg = expression();
if (arg.errored) {
return Failure::kErrored;
} else if (!arg.matched) {
@ -2984,6 +2986,15 @@ Maybe<const ast::Expression*> ParserImpl::logical_or_expression() {
return expect_logical_or_expr(lhs.value);
}
// expression:
// : relational_expression
// | short_circuit_or_expression or_or relational_expression
// | short_circuit_and_expression and_and relational_expression
// | bitwise_expression
Maybe<const ast::Expression*> ParserImpl::expression() {
return logical_or_expression();
}
// compound_assignment_operator:
// | plus_equal
// | minus_equal
@ -3076,7 +3087,7 @@ Maybe<const ast::Statement*> ParserImpl::assignment_stmt() {
}
}
auto rhs = logical_or_expression();
auto rhs = expression();
if (rhs.errored) {
return Failure::kErrored;
}

3
src/tint/reader/wgsl/parser_impl.h
View File

@ -655,6 +655,9 @@ class ParserImpl {
/// Parses a `logical_or_expression` grammar element
/// @returns the parsed expression or nullptr
Maybe<const ast::Expression*> logical_or_expression();
/// Parses an `expression` grammar element
/// @returns the parsed expression or nullptr
Maybe<const ast::Expression*> expression();
/// Parses a `compound_assignment_operator` grammar element
/// @returns the parsed compound assignment operator
Maybe<ast::BinaryOp> compound_assignment_operator();