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Support p->member, rewriting it to (*p).member in the parser. (#2455)

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* Support `p->member`, rewriting it to `(*p).member` in the parser.

This behavior is as described in
https://github.com/carbon-language/carbon-lang/tree/trunk/docs/design#pointer-types:

> `p->m` is syntactic sugar for `(*p).m`.
This commit is contained in:
Richard Smith
2022-12-08 13:42:36 -08:00
committed by GitHub
parent f10531bcb3
commit 0ef7fa3a1d
2 changed files with 43 additions and 0 deletions
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explorer/syntax/parser.ypp
+16
View File
@@ -395,11 +395,27 @@ postfix_expression:
$$ = arena->New<SimpleMemberAccessExpression>(context.source_loc(), $1,
$2);
}
| postfix_expression ARROW identifier
{
auto deref = arena->New<OperatorExpression>(
context.source_loc(), Operator::Deref,
std::vector<Nonnull<Expression*>>({$1}));
$$ = arena->New<SimpleMemberAccessExpression>(context.source_loc(), deref,
$3);
}
| postfix_expression PERIOD LEFT_PARENTHESIS expression RIGHT_PARENTHESIS
{
$$ = arena->New<CompoundMemberAccessExpression>(context.source_loc(), $1,
$4);
}
| postfix_expression ARROW LEFT_PARENTHESIS expression RIGHT_PARENTHESIS
{
auto deref = arena->New<OperatorExpression>(
context.source_loc(), Operator::Deref,
std::vector<Nonnull<Expression*>>({$1}));
$$ = arena->New<CompoundMemberAccessExpression>(context.source_loc(),
deref, $4);
}
| postfix_expression LEFT_SQUARE_BRACKET expression RIGHT_SQUARE_BRACKET
{ $$ = arena->New<IndexExpression>(context.source_loc(), $1, $3); }
| intrinsic_identifier tuple
explorer/testdata/member_access/arrow.carbon
Vendored
+27
View File
@@ -0,0 +1,27 @@
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// RUN: %{explorer-run}
// RUN: %{explorer-run-trace}
// CHECK:STDOUT: 1
// CHECK:STDOUT: 1
// CHECK:STDOUT: 1
// CHECK:STDOUT: 1
// CHECK:STDOUT: result: 0
package Foo api;
class X {
fn F[self: Self]() -> i32 { return self.n; }
var n: i32;
}
fn Main() -> i32 {
var v: X = {.n = 1};
let p: X* = &v;
Print("{0}", p->n);
Print("{0}", p->(X.n));
Print("{0}", p->F());
Print("{0}", p->(X.F)());
return 0;
}