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The SwitchCaseBlockStatement was bound to the BlockStatement of an ast::CaseStatement, but we had nothing that mapped to the actual ast::CaseStatement. sem::CaseStatement replaces sem::SwitchCaseBlockStatement, and has a Block() accessor, providing a superset of the old behavior. With this, we can now easily validate the `fallthrough` rules directly, instead of scanning the switch case. This keeps the validation more tigtly coupled to the ast / sem nodes. Change-Id: I0f22eba37bb164b9e071a6166c7a41fc1a5ac532 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/71460 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Ben Clayton <bclayton@google.com>
1.7 KiB
1.7 KiB
Compound Statements
Compound statements are statements that can hold other statements.
This document maps the WGSL compound statements to their semantic tree representations.
if statement
WGSL:
if (condition_a) {
statement_a;
} else if (condition_b) {
statement_b;
} else {
statement_c;
}
Semantic tree:
sem::IfStatement {
condition_a
sem::BlockStatement {
statement_a
}
sem::ElseStatement {
condition_b
sem::BlockStatement {
statement_b
}
}
sem::ElseStatement {
sem::BlockStatement {
statement_c
}
}
}
for loop
WGSL:
for (initializer; condition; continuing) {
statement;
}
Semantic tree:
sem::ForLoopStatement {
sem::Statement initializer
sem::Expression condition
sem::Statement continuing
sem::LoopBlockStatement {
sem::Statement statement
}
}
loop
WGSL:
loop (condition) {
statement_a;
continuing {
statement_b;
}
}
Semantic tree:
sem::LoopStatement {
sem::Expression condition
sem::LoopBlockStatement {
sem::Statement statement_a
sem::LoopContinuingBlockStatement {
sem::Statement statement_b
}
}
}
switch statement
WGSL:
switch (condition) {
case literal_a, literal_b: {
statement_a;
}
default {
statement_b;
}
}
Semantic tree:
sem::SwitchStatement {
sem::Expression condition
sem::CaseStatement {
sem::BlockStatement {
sem::Statement statement_a
}
}
sem::CaseStatement {
sem::BlockStatement {
sem::Statement statement_b
}
}
}