[WebAssembly] Add WebAssemblyLateEHPrepare pass
Summary:
Add WebAssemblyLateEHPrepare pass that does several small jobs for
exception handling. This runs before CFGSort, and is different from
WasmEHPrepare pass that runs before ISel, even though the names are
similar.
Reviewers: dschuff, majnemer
Subscribers: sbc100, jgravelle-google, sunfish, mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D46803
llvm-svn: 335438
diff --git a/llvm/test/CodeGen/WebAssembly/exception.ll b/llvm/test/CodeGen/WebAssembly/exception.ll
index c4d4a6a..c5e2975 100644
--- a/llvm/test/CodeGen/WebAssembly/exception.ll
+++ b/llvm/test/CodeGen/WebAssembly/exception.ll
@@ -17,7 +17,7 @@
ret void
}
-; CHECK-LABEL: test_catch:
+; CHECK-LABEL: test_catch_rethrow:
; CHECK: call foo@FUNCTION
; CHECK: i32.catch $push{{.+}}=, 0
; CHECK-DAG: i32.store __wasm_lpad_context
@@ -26,7 +26,8 @@
; CHECK: i32.call $push{{.+}}=, __cxa_begin_catch@FUNCTION
; CHECK: call __cxa_end_catch@FUNCTION
; CHECK: call __cxa_rethrow@FUNCTION
-define void @test_catch() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
+; CHECK-NEXT: rethrow
+define void @test_catch_rethrow() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
@@ -57,9 +58,9 @@
; CHECK-LABEL: test_cleanup:
; CHECK: call foo@FUNCTION
-; CHECK: return
+; CHECK: catch_all
; CHECK: i32.call $push20=, _ZN7CleanupD1Ev@FUNCTION
-; CHECK: rethrow 0
+; CHECK: rethrow
define void @test_cleanup() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
entry:
%c = alloca %struct.Cleanup, align 1
@@ -76,8 +77,75 @@
cleanupret from %0 unwind to caller
}
+; - Tests multple terminate pads are merged into one
+; - Tests a catch_all terminate pad is created after a catch terminate pad
+
+; CHECK-LABEL: test_terminatepad
+; CHECK: i32.catch
+; CHECK: call __clang_call_terminate@FUNCTION
+; CHECK: unreachable
+; CHECK: catch_all
+; CHECK: call _ZSt9terminatev@FUNCTION
+; CHECK-NOT: call __clang_call_terminate@FUNCTION
+define hidden i32 @test_terminatepad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
+entry:
+ %c = alloca %struct.Cleanup, align 1
+ %c1 = alloca %struct.Cleanup, align 1
+ invoke void @foo()
+ to label %invoke.cont unwind label %ehcleanup
+
+invoke.cont: ; preds = %entry
+ %call = invoke %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c1)
+ to label %try.cont unwind label %catch.dispatch
+
+ehcleanup: ; preds = %entry
+ %0 = cleanuppad within none []
+ %call4 = invoke %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c1) [ "funclet"(token %0) ]
+ to label %invoke.cont3 unwind label %terminate
+
+invoke.cont3: ; preds = %ehcleanup
+ cleanupret from %0 unwind label %catch.dispatch
+
+catch.dispatch: ; preds = %invoke.cont3, %invoke.cont
+ %1 = catchswitch within none [label %catch.start] unwind label %ehcleanup7
+
+catch.start: ; preds = %catch.dispatch
+ %2 = catchpad within %1 [i8* null]
+ %3 = call i8* @llvm.wasm.get.exception(token %2)
+ %4 = call i32 @llvm.wasm.get.ehselector(token %2)
+ %5 = call i8* @__cxa_begin_catch(i8* %3) [ "funclet"(token %2) ]
+ invoke void @__cxa_end_catch() [ "funclet"(token %2) ]
+ to label %invoke.cont5 unwind label %ehcleanup7
+
+invoke.cont5: ; preds = %catch.start
+ catchret from %2 to label %try.cont
+
+try.cont: ; preds = %invoke.cont5, %invoke.cont
+ %call6 = call %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c)
+ ret i32 0
+
+ehcleanup7: ; preds = %catch.start, %catch.dispatch
+ %6 = cleanuppad within none []
+ %call9 = invoke %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c) [ "funclet"(token %6) ]
+ to label %invoke.cont8 unwind label %terminate10
+
+invoke.cont8: ; preds = %ehcleanup7
+ cleanupret from %6 unwind to caller
+
+terminate: ; preds = %ehcleanup
+ %7 = cleanuppad within %0 []
+ %8 = call i8* @llvm.wasm.get.exception(token %7)
+ call void @__clang_call_terminate(i8* %8) [ "funclet"(token %7) ]
+ unreachable
+
+terminate10: ; preds = %ehcleanup7
+ %9 = cleanuppad within %6 []
+ %10 = call i8* @llvm.wasm.get.exception(token %9)
+ call void @__clang_call_terminate(i8* %10) [ "funclet"(token %9) ]
+ unreachable
+}
+
declare void @foo()
-declare void @func(i32)
declare i32 @__gxx_wasm_personality_v0(...)
declare i8* @llvm.wasm.get.exception(token)
declare i32 @llvm.wasm.get.ehselector(token)
@@ -86,4 +154,5 @@
declare void @__cxa_end_catch()
declare void @__cxa_rethrow()
declare void @__clang_call_terminate(i8*)
+declare void @_ZSt9terminatev()
declare %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* returned)