[wgsl-reader] Add `discard` parsing.
This CL adds parsing of the `discard` keyword to the WGSL reader.
Bug: tint:167
Change-Id: Iff91076a65715131f5f0f9bd1c8b6bf3a37cd3c7
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/25604
Reviewed-by: David Neto <dneto@google.com>
diff --git a/src/reader/wgsl/parser_impl.cc b/src/reader/wgsl/parser_impl.cc
index c3e7318..dd4a625 100644
--- a/src/reader/wgsl/parser_impl.cc
+++ b/src/reader/wgsl/parser_impl.cc
@@ -29,6 +29,7 @@
#include "src/ast/cast_expression.h"
#include "src/ast/continue_statement.h"
#include "src/ast/decorated_variable.h"
+#include "src/ast/discard_statement.h"
#include "src/ast/else_statement.h"
#include "src/ast/fallthrough_statement.h"
#include "src/ast/float_literal.h"
@@ -1426,6 +1427,7 @@
// | variable_stmt SEMICOLON
// | break_stmt SEMICOLON
// | continue_stmt SEMICOLON
+// | DISCARD SEMICOLON
// | KILL SEMICOLON
// | assignment_stmt SEMICOLON
std::unique_ptr<ast::Statement> ParserImpl::statement() {
@@ -1513,6 +1515,18 @@
return cont;
}
+ if (t.IsDiscard()) {
+ auto source = t.source();
+ next(); // Consume the peek
+
+ t = next();
+ if (!t.IsSemicolon()) {
+ set_error(t, "missing ;");
+ return nullptr;
+ }
+ return std::make_unique<ast::DiscardStatement>(source);
+ }
+
if (t.IsKill()) {
auto source = t.source();
next(); // Consume the peek
