[WebAssembly] Add tests for EH/SjLj option errors (#93583)

This adds tests for EH/SjLj option errors and swaps the error checking
order for unimportant cosmetic reasons (I think checking EH/SjLj
conflicts is more important than the model checking)

Author: aheejin

llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp

@@ -388,15 +388,29 @@ using WebAssembly::WasmEnableEmSjLj;
 using WebAssembly::WasmEnableSjLj;
 
 static void basicCheckForEHAndSjLj(TargetMachine *TM) {
-  // Before checking, we make sure TargetOptions.ExceptionModel is the same as
+
+  // You can't enable two modes of EH at the same time
+  if (WasmEnableEmEH && WasmEnableEH)
+    report_fatal_error(
+        "-enable-emscripten-cxx-exceptions not allowed with -wasm-enable-eh");
+  // You can't enable two modes of SjLj at the same time
+  if (WasmEnableEmSjLj && WasmEnableSjLj)
+    report_fatal_error(
+        "-enable-emscripten-sjlj not allowed with -wasm-enable-sjlj");
+  // You can't mix Emscripten EH with Wasm SjLj.
+  if (WasmEnableEmEH && WasmEnableSjLj)
+    report_fatal_error(
+        "-enable-emscripten-cxx-exceptions not allowed with -wasm-enable-sjlj");
+
+  // Here we make sure TargetOptions.ExceptionModel is the same as
   // MCAsmInfo.ExceptionsType. Normally these have to be the same, because clang
   // stores the exception model info in LangOptions, which is later transferred
   // to TargetOptions and MCAsmInfo. But when clang compiles bitcode directly,
   // clang's LangOptions is not used and thus the exception model info is not
   // correctly transferred to TargetOptions and MCAsmInfo, so we make sure we
-  // have the correct exception model in WebAssemblyMCAsmInfo constructor.
-  // But in this case TargetOptions is still not updated, so we make sure they
-  // are the same.
+  // have the correct exception model in WebAssemblyMCAsmInfo constructor. But
+  // in this case TargetOptions is still not updated, so we make sure they are
+  // the same.
   TM->Options.ExceptionModel = TM->getMCAsmInfo()->getExceptionHandlingType();
 
   // Basic Correctness checking related to -exception-model
@@ -418,18 +432,6 @@ static void basicCheckForEHAndSjLj(TargetMachine *TM) {
         "-exception-model=wasm only allowed with at least one of "
         "-wasm-enable-eh or -wasm-enable-sjlj");
 
-  // You can't enable two modes of EH at the same time
-  if (WasmEnableEmEH && WasmEnableEH)
-    report_fatal_error(
-        "-enable-emscripten-cxx-exceptions not allowed with -wasm-enable-eh");
-  // You can't enable two modes of SjLj at the same time
-  if (WasmEnableEmSjLj && WasmEnableSjLj)
-    report_fatal_error(
-        "-enable-emscripten-sjlj not allowed with -wasm-enable-sjlj");
-  // You can't mix Emscripten EH with Wasm SjLj.
-  if (WasmEnableEmEH && WasmEnableSjLj)
-    report_fatal_error(
-        "-enable-emscripten-cxx-exceptions not allowed with -wasm-enable-sjlj");
   // Currently it is allowed to mix Wasm EH with Emscripten SjLj as an interim
   // measure, but some code will error out at compile time in this combination.
   // See WebAssemblyLowerEmscriptenEHSjLj pass for details.

llvm/test/CodeGen/WebAssembly/eh-option-errors.ll

@@ -0,0 +1,19 @@
+target triple = "wasm32-unknown-unknown"
+
+; RUN: not --crash llc < %s -enable-emscripten-cxx-exceptions -wasm-enable-eh 2>&1 | FileCheck %s --check-prefix=EM_EH_W_WASM_EH
+; EM_EH_W_WASM_EH: LLVM ERROR: -enable-emscripten-cxx-exceptions not allowed with -wasm-enable-eh
+
+; RUN: not --crash llc < %s -enable-emscripten-sjlj -wasm-enable-sjlj 2>&1 | FileCheck %s --check-prefix=EM_SJLJ_W_WASM_SJLJ
+; EM_SJLJ_W_WASM_SJLJ: LLVM ERROR: -enable-emscripten-sjlj not allowed with -wasm-enable-sjlj
+
+; RUN: not --crash llc < %s -enable-emscripten-cxx-exceptions -wasm-enable-sjlj 2>&1 | FileCheck %s --check-prefix=EM_EH_W_WASM_SJLJ
+; EM_EH_W_WASM_SJLJ: LLVM ERROR: -enable-emscripten-cxx-exceptions not allowed with -wasm-enable-sjlj
+
+; RUN: not --crash llc < %s -wasm-enable-eh -exception-model=dwarf 2>&1 | FileCheck %s --check-prefix=EH_MODEL_DWARF
+; EH_MODEL_DWARF: LLVM ERROR: -exception-model should be either 'none' or 'wasm'
+
+; RUN: not --crash llc < %s -enable-emscripten-cxx-exceptions -exception-model=wasm 2>&1 | FileCheck %s --check-prefix=EM_EH_W_MODEL_WASM
+; EM_EH_W_MODEL_WASM: LLVM ERROR: -exception-model=wasm not allowed with -enable-emscripten-cxx-exceptions
+
+; RUN: not --crash llc < %s -exception-model=wasm 2>&1 | FileCheck %s --check-prefix=MODEL_WASM_WO_WASM_EH_SJLJ
+; MODEL_WASM_WO_WASM_EH_SJLJ: LLVM ERROR: -exception-model=wasm only allowed with at least one of -wasm-enable-eh or -wasm-enable-sjlj

llvm/test/CodeGen/WebAssembly/lower-em-ehsjlj-options.ll

@@ -1,7 +1,6 @@
 ; RUN: llc < %s -enable-emscripten-cxx-exceptions | FileCheck %s --check-prefix=EH
 ; RUN: llc < %s -enable-emscripten-sjlj | FileCheck %s --check-prefix=SJLJ
 ; RUN: llc < %s | FileCheck %s --check-prefix=NONE
-; RUN: not --crash llc < %s -enable-emscripten-cxx-exceptions -exception-model=wasm 2>&1 | FileCheck %s --check-prefix=WASM-EH-EM-EH
 
 target triple = "wasm32-unknown-unknown"
 
@@ -97,5 +96,3 @@ declare void @free(ptr)
 attributes #0 = { returns_twice }
 attributes #1 = { noreturn }
 attributes #2 = { nounwind }
-
-; WASM-EH-EM-EH: LLVM ERROR: -exception-model=wasm not allowed with -enable-emscripten-cxx-exceptions