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wsgl parser: Remove pointless nullptr checks 

The `expect_` prefixes now clearly indicate when a method will internally error, or produce a valid AST object.

Verified by code coverage.

Bug: tint:282
Change-Id: Icbdae9db02bd48c69aec010a4f8fdc5a496125f8
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/32002
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
This commit is contained in:
Ben Clayton 2020-11-09 15:58:42 +00:00 committed by Commit Bot service account
parent 7b750dc733
commit cd477e6b7b
1 changed files with 0 additions and 41 deletions
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41
src/reader/wgsl/parser_impl.cc
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@ -306,11 +306,6 @@ std::unique_ptr<ast::Variable> ParserImpl::global_variable_decl(
auto expr = expect_const_expr();
if (has_error())
return nullptr;
if (expr == nullptr) {
add_error(peek(), "invalid expression");
return nullptr;
}
var->set_constructor(std::move(expr));
}
return var;
@ -343,10 +338,6 @@ std::unique_ptr<ast::Variable> ParserImpl::global_constant_decl() {
auto init = expect_const_expr();
if (has_error())
return nullptr;
if (init == nullptr) {
add_error(peek(), "error parsing scalar constructor");
return nullptr;
}
var->set_constructor(std::move(init));
return var;
@ -1163,10 +1154,6 @@ ast::StructMemberList ParserImpl::expect_struct_body_decl() {
auto mem = expect_struct_member(decos);
if (has_error())
return ast::StructMemberList{};
if (mem == nullptr) {
add_error(peek(), "invalid struct member");
return ast::StructMemberList{};
}
members.push_back(std::move(mem));
}
@ -1593,10 +1580,6 @@ std::unique_ptr<ast::IfStatement> ParserImpl::if_stmt() {
auto condition = expect_paren_rhs_stmt();
if (has_error())
return nullptr;
if (condition == nullptr) {
add_error(peek(), "unable to parse if condition");
return nullptr;
}
auto body = expect_body_stmt();
if (has_error())
@ -1635,10 +1618,6 @@ ast::ElseStatementList ParserImpl::elseif_stmt() {
auto condition = expect_paren_rhs_stmt();
if (has_error())
return {};
if (condition == nullptr) {
add_error(peek(), "unable to parse condition expression");
return {};
}
auto body = expect_body_stmt();
if (has_error())
@ -1682,10 +1661,6 @@ std::unique_ptr<ast::SwitchStatement> ParserImpl::switch_stmt() {
auto condition = expect_paren_rhs_stmt();
if (has_error())
return nullptr;
if (condition == nullptr) {
add_error(peek(), "unable to parse switch expression");
return nullptr;
}
ast::CaseStatementList body;
bool ok = expect_brace_block("switch statement", [&] {
@ -2063,10 +2038,6 @@ std::unique_ptr<ast::Expression> ParserImpl::primary_expression() {
auto params = expect_paren_rhs_stmt();
if (has_error())
return nullptr;
if (params == nullptr) {
add_error(peek(), "unable to parse parameters");
return nullptr;
}
return std::make_unique<ast::BitcastExpression>(source, type,
std::move(params));
@ -2749,19 +2720,11 @@ ParserImpl::expect_const_expr_internal(uint32_t depth) {
auto param = expect_const_expr_internal(depth + 1);
if (has_error())
return false;
if (param == nullptr) {
add_error(peek(), "unable to parse constant expression");
return false;
}
params.push_back(std::move(param));
while (match(Token::Type::kComma)) {
param = expect_const_expr_internal(depth + 1);
if (has_error())
return false;
if (param == nullptr) {
add_error(peek(), "unable to parse constant expression");
return false;
}
params.push_back(std::move(param));
}
return true;
@ -2810,10 +2773,6 @@ bool ParserImpl::decoration_bracketed_list(ast::DecorationList& decos) {
return false;
}
if (has_error()) {
return false;
}
if (match(Token::Type::kComma)) {
continue;
}