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Replaced std::exit() with return Carbon::ErrorOr for expected errors like invalid syntax (#1120)

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* Replaced std::exit() with return llvm::Expected/llvm::Error<T> for expected errors like invalid syntax.

* Use llvm::formatv() for formatting lexer error messages.
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* Addresed merge errors.

* Fixed impl scope.

* Made ErrorBuilder::operator<< nodiscard, to catch code forgetting 'return' in 'return FATAL_COMPILATION_ERROR()'.

* FatalComplationError() -> ParseAndLexContext::RecordLexerError().
Other usages of ERROR_TOKEN in lexer.lpp were actually supposed to be END_OF_FILE.

* Update executable_semantics/syntax/parse_and_lex_context.h

Co-authored-by: Jon Meow <jperkins@google.com>

* Code review fixes.

* Update executable_semantics/syntax/parser.ypp

Co-authored-by: Jon Meow <jperkins@google.com>

* More code review fixes.

* Update executable_semantics/interpreter/type_checker.h

Co-authored-by: Jon Meow <jperkins@google.com>

* Yet more code review fixes...

* Update executable_semantics/syntax/lexer.lpp

Co-authored-by: Jon Meow <jperkins@google.com>

* code review comments

* Update executable_semantics/interpreter/interpreter.cpp

Co-authored-by: Geoff Romer <gromer@google.com>

* Apply suggestions from code review

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/syntax/lexer.lpp

Co-authored-by: Jon Meow <jperkins@google.com>

* code review

* code review

* Apply suggestions from code review

Co-authored-by: Jon Meow <jperkins@google.com>

* formatted code

* review comments

* Switched to the new ErrorOr<V> error implementation

* code review comments

* fixed comment

* restored ostream.h as #976 makes the change unnecesary

* review comments

Co-authored-by: Jon Meow <jperkins@google.com>
Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
pk19604014
2022-03-22 16:17:04 -04:00
committed by GitHub
co-authored by Jon Meow Geoff Romer
parent e5a87af6fe
commit aa8a5f174d
43 changed files with 1324 additions and 873 deletions
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executable_semantics/ast/pattern.cpp
+5 -13
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@@ -108,23 +108,15 @@ auto TuplePatternFromParenContents(Nonnull<Arena*> arena,
// Used by AlternativePattern for constructor initialization. Produces a helpful
// error for incorrect expressions, rather than letting a default cast error
// apply.
static auto RequireFieldAccess(Nonnull<Expression*> alternative)
-> FieldAccessExpression& {
auto AlternativePattern::RequireFieldAccess(Nonnull<Expression*> alternative)
-> ErrorOr<Nonnull<FieldAccessExpression*>> {
if (alternative->kind() != ExpressionKind::FieldAccessExpression) {
FATAL_PROGRAM_ERROR(alternative->source_loc())
<< "Alternative pattern must have the form of a field access.";
return FATAL_PROGRAM_ERROR(alternative->source_loc())
<< "Alternative pattern must have the form of a field access.";
}
return cast<FieldAccessExpression>(*alternative);
return &cast<FieldAccessExpression>(*alternative);
}
AlternativePattern::AlternativePattern(SourceLocation source_loc,
Nonnull<Expression*> alternative,
Nonnull<TuplePattern*> arguments)
: Pattern(AstNodeKind::AlternativePattern, source_loc),
choice_type_(&RequireFieldAccess(alternative).aggregate()),
alternative_name_(RequireFieldAccess(alternative).field()),
arguments_(arguments) {}
auto ParenExpressionToParenPattern(Nonnull<Arena*> arena,
const ParenContents<Expression>& contents)
-> ParenContents<Pattern> {