Removing exceptions from core/compiler-core (#1953)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Refactor Stream. Working on all tests.

* Split out CharEncode.

* Make method names lower camel.
m_prefix in Writer/Reader

* Tidy up around CharEncode interface.

* Small improvements around encode/decode.

* Better use of types.

* Remove readLine from TextReader.

* Remove exceptions from Stream/Text handling.

* Fix some typos.

* Fix tabbing.

* Fix missing override.

* Remove remaining exception throw/catch via using signal mechanism.

* Remove exceptions that are not used anymore.

* Document the Stream interface.

* Remove index for decoding 'get byte' function.

* Fix CharReader -> ByteReader.

1 files changed, 44 insertions, 0 deletions

diff --git a/source/core/slang-signal.h b/source/core/slang-signal.h
new file mode 100644
index 000000000..2151bdcfe
--- /dev/null
+++ b/source/core/slang-signal.h
@@ -0,0 +1,44 @@
+#ifndef SLANG_CORE_SIGNAL_H
+#define SLANG_CORE_SIGNAL_H
+
+#include "slang-common.h"
+
+namespace Slang
+{
+
+enum class SignalType
+{
+    Unexpected,
+    Unimplemented,
+    AssertFailure,
+    Unreachable,
+    InvalidOperation,
+    AbortCompilation,
+};
+
+
+// Note that message can be passed as nullptr for no message.
+SLANG_RETURN_NEVER void handleSignal(SignalType type, char const* message);
+
+#define SLANG_UNEXPECTED(reason) \
+    ::Slang::handleSignal(::Slang::SignalType::Unexpected, reason)
+
+#define SLANG_UNIMPLEMENTED_X(what) \
+    ::Slang::handleSignal(::Slang::SignalType::Unimplemented, what)
+
+#define SLANG_UNREACHABLE(msg) \
+    ::Slang::handleSignal(::Slang::SignalType::Unreachable, msg)
+
+#define SLANG_ASSERT_FAILURE(msg) \
+    ::Slang::handleSignal(::Slang::SignalType::AssertFailure, msg)
+
+#define SLANG_INVALID_OPERATION(msg) \
+    ::Slang::handleSignal(::Slang::SignalType::InvalidOperation, msg)
+
+#define SLANG_ABORT_COMPILATION(msg) \
+    ::Slang::handleSignal(::Slang::SignalType::AbortCompilation, msg)
+
+
+}
+
+#endif