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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.
x

* 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/static_scope.cpp
+22 -15
View File
@@ -5,43 +5,50 @@
#include "executable_semantics/ast/static_scope.h"
#include "executable_semantics/common/error.h"
#include "llvm/Support/Error.h"
namespace Carbon {
void StaticScope::Add(std::string name, ValueNodeView entity) {
auto StaticScope::Add(std::string name, ValueNodeView entity)
-> ErrorOr<Success> {
auto [it, success] = declared_names_.insert({name, entity});
if (!success && it->second != entity) {
FATAL_COMPILATION_ERROR(entity.base().source_loc())
<< "Duplicate name `" << name << "` also found at "
<< it->second.base().source_loc();
return FATAL_COMPILATION_ERROR(entity.base().source_loc())
<< "Duplicate name `" << name << "` also found at "
<< it->second.base().source_loc();
}
return Success();
}
auto StaticScope::Resolve(const std::string& name,
SourceLocation source_loc) const -> ValueNodeView {
std::optional<ValueNodeView> result = TryResolve(name, source_loc);
if (!result.has_value()) {
FATAL_COMPILATION_ERROR(source_loc) << "could not resolve '" << name << "'";
SourceLocation source_loc) const
-> ErrorOr<ValueNodeView> {
ASSIGN_OR_RETURN(std::optional<ValueNodeView> result,
TryResolve(name, source_loc));
if (!result) {
return FATAL_COMPILATION_ERROR(source_loc)
<< "could not resolve '" << name << "'";
}
return *result;
}
auto StaticScope::TryResolve(const std::string& name,
SourceLocation source_loc) const
-> std::optional<ValueNodeView> {
-> ErrorOr<std::optional<ValueNodeView>> {
auto it = declared_names_.find(name);
if (it != declared_names_.end()) {
return it->second;
return std::make_optional(it->second);
}
std::optional<ValueNodeView> result;
for (Nonnull<const StaticScope*> parent : parent_scopes_) {
auto parent_result = parent->TryResolve(name, source_loc);
ASSIGN_OR_RETURN(std::optional<ValueNodeView> parent_result,
parent->TryResolve(name, source_loc));
if (parent_result.has_value() && result.has_value() &&
*parent_result != *result) {
FATAL_COMPILATION_ERROR(source_loc)
<< "'" << name << "' is ambiguous between "
<< result->base().source_loc() << " and "
<< parent_result->base().source_loc();
return FATAL_COMPILATION_ERROR(source_loc)
<< "'" << name << "' is ambiguous between "
<< result->base().source_loc() << " and "
<< parent_result->base().source_loc();
}
result = parent_result;
}