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Code Issues Packages Projects Releases 10 Wiki Activity

Explorer: support virtual class methods (#2462)

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Features:
* Add `virtual` virtual override keyword for functions
* Support `virtual` class methods using dynamic dispatch

Changes:
* Add `vtable` in `NominalClassType`, 
* Add `NominalClassValue**` in class values pointing to  descendant-most class
* Resolve virtual methods during member lookup

Limitations:
* Does not include yet `impl`, `abstract` virtual override keywords, or the complete logic for virtual function declaration

Depends on #2460 
Relates to #1881 
Relates to #2493
This commit is contained in:
Adrien Leravat
2023-01-02 12:37:49 -08:00
committed by GitHub
parent dd26ea6a15
commit 8301258ef8
17 changed files with 359 additions and 39 deletions
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explorer/testdata/class/fail_virtual_class_function.carbon
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+21
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// 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: %{not} %{explorer-run}
// RUN: %{not} %{explorer-run-trace}
package ExplorerTest api;
class C {
virtual fn Foo() -> i32 {
return 1;
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/class/fail_virtual_class_function.carbon:[[@LINE+1]]: Error declaring `Foo`: class functions cannot be virtual.
}
}
fn Main() -> i32 {
let c: C = {};
return 0;
}