Features:
* Add basic support for `impl` virtual methods (override virtual method)
* Error on invalid declaration for `impl` and `virtual`, covering simple use cases
* Add `abstract` fn parser-only support
Changes:
* Modify parser to handle new function specifiers, resolve conflicts
* Group `virtual_override` and `FN`, and group `impl_kind` and `IMPL` to avoid ambiguities with around `impl` token parsing
* Add new `VirtualOverride` enum for function declarations, and matching `virt_override() -> VirtualOverride` getter
* Update function declaration logic
Depends on #2462
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
Protobufs code hits a warning with the latest system headers on macOS.
I figured this may have been fixed so I updated protobufs and Bazel to
the latest releases. This generally cleaned things up.
However, it actually added *more* warnings. This clearly isn't a really
well tested path. In fact, we already have a disabled warning that we'd
like for Carbon code because LLVM isn't clean for that warning.
So I've switched our warning strategy to a more durable approach of
suppressing all warnings for external repository headers and source
files. This lets us re-enable the missing warning and should fix the
protobuf warning that started me down this twisty path.
Sadly, we *have* to update to Bazel 6 in order to have the necessary
flag to use this approach to suppressing warnings, so I couldn't do this
as two PRs cleanly. =/ That's why I've bundled both the Bazel (and
protobuf) updates with the warning strategy change.
Last but not least, I've fixed several unused parameters in Carbon's
code that our warnings now catch.
Relates to https://github.com/carbon-language/carbon-lang/issues/1881
- Add support for `.base` field in structs for [parent class initialization](https://github.com/carbon-language/carbon-lang/blob/trunk/docs/design/classes.md#constructors)
- Disabling base class initialization without `.base`
- Support class constructors (`Create() -> Self`) for base classes
- Direct access to base class(es) attributes with `object.var` remains unaffected
Changes:
- Add `TypeChecker::FieldTypesWithBase` to help assessing if a struct with `base` fields can be converted to a class
- Add a new `base_type()` attribute+getter to `NominalClassDeclaration` to as a first step to allow resolving parametrized classes
- Add a new `base` attribute+getter to `NominalClassValue` that contains the base class `NominalClassValue`. It is currently used mainly to get and set members of a class object.
- Add `Interpreter::ConvertClassWithBase` to build `NominalClassValue` from a init struct, that contains `.base` fields with either `NominalClassValue` or `StructValue`
- Add `FindClassField` to find a field in a class or its base classes
- Remove superfluous `ClassDeclaration::base()` in favor of `ClassDeclaration::base_type()`
Limitations;
- Though some work is done in that direction, parametrized base class where time is not know at the declaration site are not supported. Namely the example below does not compile
```
base class A(T:! Type) {}
class B(T:! Type) extends A(T) {}
```
But this one is functional already
```
base class A(T:! Type) {}
class B extends A(i32) {}
```
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
In particular, this means that a type can implement `ImplicitAs(Type)` and have values of that type behave like types.
This implies that `()` and `{}` are no longer types. They are now values whose type is the result of converting `()` or `{}` to type `Type`, as has been discussed recently and seems to be the supported direction. This fixes various cases where these types were previously mishandled.
Note, not trying to address every last error, just some obvious/easy ones.
```
/usr/local/google/home/jperkins/dev/carbon-lang/common/string_helpers.cpp:200:13: warning: prefer transparent functors 'less_equal<>' [modernize-use-transparent-functors]
auto le = std::less_equal<const char*>();
^
/usr/local/google/home/jperkins/dev/carbon-lang/toolchain/semantics/nodes/function.h:22:45: warning: pass by value and use std::move [modernize-pass-by-value]
Function(ParseTree::Node node, NodeId id, llvm::SmallVector<NodeRef> body)
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/ast/declaration.cpp:230:14: warning: static member accessed through instance [readability-static-accessed-through-instance]
return cast<SelfDeclaration>(declaration).name();
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/interpreter/type_checker.cpp:1104:33: warning: std::move of the variable 'impl' of the trivially-copyable type 'ConstraintType::ImplConstraint' has no effect [performance-move-const-arg]
impl_constraints_.push_back(std::move(impl));
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/interpreter/type_checker.cpp:1145:36: warning: std::move of the variable 'rewrite' of the trivially-copyable type 'ConstraintType::RewriteConstraint' has no effect [performance-move-const-arg]
rewrite_constraints_.push_back(std::move(rewrite));
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/interpreter/type_checker.cpp:1156:32: warning: std::move of the variable 'context' of the trivially-copyable type 'ConstraintType::LookupContext' has no effect [performance-move-const-arg]
lookup_contexts_.push_back(std::move(context));
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/fuzzing/fuzzverter.cpp:74:42: warning: argument name 'trace' in comment does not match parameter name 'parser_debug' [bugprone-argument-comment]
/*trace=*/false);
^
./explorer/syntax/parse.h:19:17: note: 'parser_debug' declared here
bool parser_debug) -> ErrorOr<Carbon::AST>;
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/fuzzing/proto_to_carbon_test.cpp:34:55: warning: argument name 'trace' in comment does not match parameter name 'parser_debug' [bugprone-argument-comment]
const ErrorOr<AST> ast = Carbon::Parse(&arena, f, /*trace=*/false);
^
./explorer/syntax/parse.h:19:17: note: 'parser_debug' declared here
bool parser_debug) -> ErrorOr<Carbon::AST>;
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/fuzzing/proto_to_carbon_test.cpp:42:41: warning: argument name 'trace' in comment does not match parameter name 'parser_debug' [bugprone-argument-comment]
&arena, f, source_from_proto, /*trace=*/false);
^
./explorer/syntax/parse.h:25:59: note: 'parser_debug' declared here
std::string_view file_contents, bool parser_debug)
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/syntax/parse_test.cpp:27:60: warning: argument name 'trace' in comment does not match parameter name 'parser_debug' [bugprone-argument-comment]
ParseFromString(&arena, "file.carbon", FileContents, /*trace=*/false);
^
./explorer/syntax/parse.h:25:59: note: 'parser_debug' declared here
std::string_view file_contents, bool parser_debug)
^
/usr/local/google/home/jperkins/dev/carbon-lang/migrate_cpp/cpp_refactoring/var_decl.cpp:57:58: warning: string concatenation results in allocation of unnecessary temporary strings; consider using 'operator+=' or 'string::append()' instead [performance-inefficient-string-concatenation]
segments.push_back({type_loc_class, qual_str + " " + range_str});
^
/usr/local/google/home/jperkins/dev/carbon-lang/explorer/fuzzing/ast_to_proto_test.cpp:105:55: warning: argument name 'trace' in comment does not match parameter name 'parser_debug' [bugprone-argument-comment]
const ErrorOr<AST> ast = Carbon::Parse(&arena, f, /*trace=*/false);
^
./explorer/syntax/parse.h:19:17: note: 'parser_debug' declared here
bool parser_debug) -> ErrorOr<Carbon::AST>;
^
```
Implements basic support for rewrite constraints as proposed in #2173.
Support for associated constants and complex constraints in general is also made more robust: argument deduction now properly computes and substitutes witnesses, and interface declarations track a more correct description of the constraint that they introduce than the one we previously built.
Instead of forming a `SymbolicWitness` that contains an `Expression` when we can't directly resolve a witness to an `impl`, form different kinds of `Witness` values for the various situations:
- A `BindingWitness` witnesses that a type implements a constraint by reference to an `ImplBinding`.
- A `ConstraintWitness` witnesses that a type implements a constraint by reference to witnesses for each of the impl constraints within the constraint.
- A `ConstraintImplWitness` witnesses that a type implements a constraint by reference to a larger constraint which contains that constraint as an impl constraint.
Remove `SymbolicWitness` values and `InstantiateImpl` expressions, which are now unused. In order to remove the final usage of `SymbolicWitness`, I fixed a TODO to give `Self` the proper type within an interface declaration. I don't think this is an observable change.
No functional change intended.
* Multiplication and division have the same priority.
* A new builtin interface DivWith is added.
* In some tests expecting a compilation error (syntax error), the error
message now says it is expecting SLASH or binary *.
libprotobuf_mutator and abseil have warnings that are already fixed in newer versions.
bison outputs code that hits new warnings; there I'm just silencing it because testing a newer bison version is more difficult.
Fixes#1650Fixes#1660
* Replay changes from pre-force-push mixin branch
* Base MixinPseudoType off of the new InterfaceType
* Add more test cases.
Also removed an unnecessary check that would have already been
handled by the parser.
* WIP detect member clashes during mixing mixins
* Implement fuzzer changes
* Implement member name clash check when mixing mixins
* Modify parser and lexer for experimental mixin feature
* Add comments
* Update explorer/testdata/mixin/simple-mix-in-mixin.carbon
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
* Update explorer/testdata/mixin/use-mixin-method-in-class-method.carbon
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
* Make code review changes
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
The most significant change here is that explorer now uses the chosen spelling
rather than the old `Bool` spelling. Also update a few documentation examples
and some skeletal design docs to use the chosen spelling.
Provides a first implementation iteration towards class prefix and extension, along with user-friendly error regarding missing implementation for #1881
**Explorer behavior**
For class prefix `base` and `abstract`:
```
Class prefixes `base` and `abstract` are not supported yet
```
For extension with `extends`:
```
Class extension with `extends` is not supported yet
```
**Motivation**
* Provides user-friendly error for these unsupported features
* First implementation increment in supporting class prefix and extension.
Following #1191, add initial support for bitwise operators. Support for both
integer operations and for operator overloading via the interfaces specified in
#1191 is provided.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This allows us to combine multiple Errors together without repeating the prefix
information. Also fixes several cases where two "COMPILATION ERROR" prefixes
would be prepended to the same message when errors with prefixes and locations
were produced by the lexer and parser.
Allows unformed state for local variables. Reports a run-time error when an unformed local variable is used.
- Added declaration without initialization for local variables in the parser.
- Made the init expression of VariableDefinition optional.
- Expanded (alive, dead) to (uninitialized, alive, dead) in the Heap.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Basic support for declaring, specifying the values of, and using associated constants.
This is incomplete in various ways. For example, when checking whether a type satisfies a constraint, there is no check that its associated constants match those in the constraint, and name lookup into a value whose type is an associated constant is not supported yet.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This PR implements the `returned var` for the explorer.
- Enabled `returned var` and `return var` syntax in lexer and parser.
- Split `Return` statement into `ReturnVar` and `ReturnExpression` to distinguish the two types of returns.
- Added logic in name resolution, type checking and interpretation to process `returned var` definition and `ReturnVar` statement.
We fundamentally have cyclic references between declarations,
statements, expressions, and patterns, and there's no meaningful
layering between them. Combine them into a single build target.
Components such as paren_contents, static_scope, and library_name that
are defined without reference to specific AST nodes are kept as separate
BUILD targets.
* test cases for raw string literals
* raw string literal implementation
* match as block string if starting with triple ", and better error message for simple string
except for *#"""#*
* fix broken test case
block string literal cannot be one line
* test cases for raw string literals
* raw string literal implementation
* match as block string if starting with triple ", and better error message for simple string
except for *#"""#*
* fix broken test case
block string literal cannot be one line
* removed unused initial value
* rename flag to indicate multi-line string and remove comment
* use * to get value from std::optional
* clean-ups
* removed skip_scan flag and directly return in case of a single line string starting with #+\'\'\'
* Updated error message: simple string -> single-line string.
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
* Updated test cases according to changes in error message
* Removed counting_hashtag flag.
* Implemented ScanHelper class to handle scanning
* Fixed explanation of ReadHashTags.
* Addressed PR comment.
* Clarify that scan_helper holds the source text.
* Addressed PR comments.
* Updated error messages in test cases.
* Added const keyword to return type of GetCurrentStr().
* addressed PR comments.
1. Moved ScanHelper class to lex_scan_helper.h and lex_scan_helper.cpp.
2. Moved ReadHashTags and Process* functions to lex_scan_helper.cpp. Moved YY_USER_ACTION, SIMPLE_TOKEN and ARG_TOKEN to lex_helper.h. Added a wrapper function YyinputWrapper to call static function yyinput in lexer.lpp.
3. Renamed ScanHelper with StringLexHelper.
4. Modified BUILD accordingly.
5. Renamed data members and functions.
* Addressed PR comments.
1. Adjusted order to keep ret usage close.
2. Used resize to construct the string to avoid creation of temp string.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Removed the multi_line flag and skip_read field to improve readability.
* Copied default parameter value to definition of UnescapeStringLiteral.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Copied default parameter value to definition of ParseBlockStringLiteral.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Prefix CARBON_ to SIMPLE_TOKEN and ARG_TOKEN macros.
* Rollback redefinition of arguments.
* Updated comment on the flex macro.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Updated wording.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Moved the EOF error out of the loop.
* Removed duplicated declaration.
* Changed type of `hashtag_num` and `leading_quotes` to int.
* Minor fix: string copy.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Added comment on YyinputWrapper.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Garmmar in comment.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
* Added check of eof before readling next char.
* Minor updates based on PR comments.
* Minor changes to address PR comments.
* Used a clearer way to calculate `hashtag_num` and `leading_quotes`. Switched back to indicate muti-line string with a flag.
* Directly copy StringRef for compilation error message.
* Make str_with_quote const as we don't change it.
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
* Added TODO for unsupported cases.
* Fixed a typo.
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
`.Self` is modeled as a new kind of expression, `DotSelfExpression`. Name resolution associates each occurrence of a `DotSelfExpression` with a generic binding, much like for an `IdentifierExpression`.
Both `:!` bindings and `where` expressions bring `.Self` into scope. The tentative intent is that if there are multiple `.Self`s in scope and they refer to different bindings, the result of using a `.Self` expression is an ambiguity error, but that is not implemented in this patch. Instead, like for `IdentifierExpression`s, we find the innermost enclosing definition of `.Self`.
`.Foo` expressions are rewritten to `.Self.Foo`, but this isn't enough to make them do anything useful, because associated constants aren't supported in general yet.
Build constraint types from `where` expressions. This is very bare-bones; there's no support for constraining `.Self` or associated types yet, but degenerate cases not involving self-reference work.
`==` constraints are syntactically supported but not semantically verified yet, and they aren't used for anything.
The syntax permitted in an `interface` is similar to, but different from, that permitted elsewhere. For example, associated constant declarations (`let T:! Type;`) with no initializers are valid in interfaces but nowhere else, and are a different kind of declaration from what a normal `let` declaration would produce both syntactically and semantically.
Because interfaces and impls permit only a very small subset of the complete set of kinds of declaration, it's simpler to list only the kinds that are permitted rather than to allow an arbitrary declaration and semantically disallow the invalid cases, and it's also likely to lead to better error messages as we won't try to parse unintended or meaningless things.
Add scaffolding for constraints in general, and support specifically constraints formed by applying a `&` operator.
No support for constraints formed with `where` nor for named constraints at this point.
* Implement addr keyword
* Add files that were deleted during merge
Some files got deleted during merging trunk because of the executable
semantics rename.
* Implement changes from code review.
Major changes:
- Rename AddrBindingPattern to AddrPattern
- Fix AddrPattern related changes in fuzzing
* Update documentation for GetField
* Fix AddPattern according to @zygoloid's suggestions
* Apply @zygoloid's changes to method comment
* Add a multi-component field example
* Incorporate AST changes to fuzzer corpus
* Refactor the deduced_param_list grammar rule
Suggested by @zygoloid
This supports aliases for types (including interfaces), functions, parameterized types, instance member names, and interface member names.
Co-authored-by: Jon Meow <jperkins@google.com>
Implement initial support for `A.(B)` syntax, per #989. Specifically, this supports:
* `object.(Type.member)` for instance members,
* `object.(Interface.member)` for instance and non-instance members,
* `object.(Type.(Interface.member))` for instance members,
* `Type.(Interface.member)` for non-instance members.
Three new AST nodes are introduced:
* `CompoundFieldAccessExpression` represents the `A.(B)` syntax.
* `MemberName` is a `Value` that represents the result of evaluating an expression such as `Type.member` or `Interface.member` or `Type.(Interface.member)`.
* `TypeOfMemberName` is the type of a `MemberName` value.
In order to handle members of classes and interfaces which have corresponding declarations and may need substitution into their types, and members of structs which don't have declarations but also don't need substitution, a class `Member` is introduced that can refer to either of these kinds of member.
Co-authored-by: Geoff Romer <gromer@google.com>
Co-authored-by: Jon Meow <jperkins@google.com>
Adrien Leravat
Chandler Carruth
Richard Smith
Jon Ross-Perkins
Geoff Romer
pmqtt
Junhee Cho
Darshal Shettyandjosh11b
pk19604014
Zenong Zhang