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llvm-mirror/test/CodeGen/WebAssembly/wasmehprepare.ll
Heejin Ahn 9f0b3d7141 [WebAssembly] Fix wasm.lsda() optimization in WasmEHPrepare 
Summary:
When we insert a call to the personality function wrapper
(`_Unwind_CallPersonality`) for a catch pad, we store some necessary
info in `__wasm_lpad_context` struct and pass it. One of the info is the
LSDA address for the function. For this, we insert a call to
`wasm.lsda()`, which will be lowered down to the address of LSDA, and
store it in a field in `__wasm_lpad_context`.

There are exceptions to this personality call insertion: catchpads for
`catch (...)` and cleanuppads (for destructors) don't need personality
function calls, because we don't need to figure out whether the current
exception should be caught or not. (They always should.)

There was a little optimization to `wasm.lsda()` call insertion. Because
the LSDA address is the same throughout a function, we don't need to
insert a store of `wasm.lsda()` return value in every catchpad. For
example:
```
try {
  foo();
} catch (int) {
  // wasm.lsda() call and a store are inserted here, like, in
  // pseudocode,
  // %lsda = wasm.lsda();
  // store %lsda to a field in __wasm_lpad_context
  try {
    foo();
  } catch (int) {
    // We don't need to insert the wasm.lsda() and store again, because
    // to arrive here, we have already stored the LSDA address to
    // __wasm_lpad_context in the outer catch.
  }
}
```
So the previous algorithm checked if the current catch has a parent EH
pad, we didn't insert a call to `wasm.lsda()` and its store.

But this was incorrect, because what if the outer catch is `catch (...)`
or a cleanuppad?
```
try {
  foo();
} catch (...) {
  // wasm.lsda() call and a store are NOT inserted here
  try {
    foo();
  } catch (int) {
    // We need wasm.lsda() here!
  }
}
```
In this case we need to insert `wasm.lsda()` in the inner catchpad,
because the outer catchpad does not have one.

To minimize the number of inserted `wasm.lsda()` calls and stores, we
need a way to figure out whether we have encountered `wasm.lsda()` call
in any of EH pads that dominates the current EH pad. To figure that
out, we now visit EH pads in BFS order in the dominator tree so that we
visit parent BBs first before visiting its child BBs in the domtree.

We keep a set named `ExecutedLSDA`, which basically means "Do we have
`wasm.lsda()` either in the current EH pad or any of its parent EH
pads in the dominator tree?". This is to prevent scanning the domtree up
to the root in the worst case every time we examine an EH pad: each EH
pad only needs to examine its immediate parent EH pad.

- If any of its parent EH pads in the domtree has `wasm.lsda()`, this
  means we don't need `wasm.lsda()` in the current EH pad. We also insert
  the current EH pad in `ExecutedLSDA` set.
- If none of its parent EH pad has `wasm.lsda()`
  - If the current EH pad is a `catch (...)` or a cleanuppad, done.
  - If the current EH pad is neither a `catch (...)` nor a cleanuppad,
    add `wasm.lsda()` and the store in the current EH pad, and add the
    current EH pad to `ExecutedLSDA` set.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77423
2020-04-04 07:02:50 -07:00

615 lines
23 KiB
LLVM
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; RUN: opt < %s -winehprepare -demote-catchswitch-only -wasmehprepare -S | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
; CHECK: @__wasm_lpad_context = external global { i32, i8*, i32 }
@_ZTIi = external constant i8*
%struct.Temp = type { i8 }
; A single 'catch (int)' clause.
; A wasm.catch() call, wasm.lsda() call, and personality call to generate a
; selector should all be genereated after the catchpad.
;
; void foo();
; void test0() {
; try {
; foo();
; } catch (int) {
; }
; }
define void @test0() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test0()
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
; CHECK: catch.start:
; CHECK-NEXT: %[[CATCHPAD:.*]] = catchpad
; CHECK-NEXT: %[[EXN:.*]] = call i8* @llvm.wasm.extract.exception()
; CHECK-NEXT: call void @llvm.wasm.landingpad.index(token %[[CATCHPAD]], i32 0)
; CHECK-NEXT: store i32 0, i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 0)
; CHECK-NEXT: %[[LSDA:.*]] = call i8* @llvm.wasm.lsda()
; CHECK-NEXT: store i8* %[[LSDA]], i8** getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 1)
; CHECK-NEXT: call i32 @_Unwind_CallPersonality(i8* %[[EXN]]) {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
; CHECK-NEXT: %[[SELECTOR:.*]] = load i32, i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 2)
; CHECK: icmp eq i32 %[[SELECTOR]]
catch: ; preds = %catch.start
%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
; CHECK: catch:
; CHECK-NEXT: call i8* @__cxa_begin_catch(i8* %[[EXN]])
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ]
unreachable
try.cont: ; preds = %entry, %catch
ret void
}
; Two try-catches.
; For the catchpad with a single 'catch (...)', only a wasm.catch() call should
; be generated after the catchpad; wasm.landingpad.index() and personality call
; should NOT be generated. For the other catchpad, the argument of
; wasm.landingpad.index() should be not 1 but 0.
;
; void foo();
; void test1() {
; try {
; foo();
; } catch (...) {
; }
; try {
; foo();
; } catch (int) {
; }
; }
define void @test1() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test1()
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
; CHECK: catch.start:
; CHECK-NEXT: catchpad within %0 [i8* null]
; CHECK-NOT: call void @llvm.wasm.landingpad.index
; CHECK-NOT: store {{.*}} @__wasm_lpad_context
; CHECK-NOT: call i8* @llvm.wasm.lsda()
; CHECK-NOT: call i32 @_Unwind_CallPersonality
; CHECK-NOT: load {{.*}} @__wasm_lpad_context
try.cont: ; preds = %entry, %catch.start
invoke void @foo()
to label %try.cont7 unwind label %catch.dispatch2
catch.dispatch2: ; preds = %try.cont
%5 = catchswitch within none [label %catch.start3] unwind to caller
catch.start3: ; preds = %catch.dispatch2
%6 = catchpad within %5 [i8* bitcast (i8** @_ZTIi to i8*)]
%7 = call i8* @llvm.wasm.get.exception(token %6)
%8 = call i32 @llvm.wasm.get.ehselector(token %6)
%9 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %8, %9
br i1 %matches, label %catch4, label %rethrow
; CHECK: catch.start3:
; CHECK: call void @llvm.wasm.landingpad.index(token %{{.+}}, i32 0)
catch4: ; preds = %catch.start3
%10 = call i8* @__cxa_begin_catch(i8* %7) [ "funclet"(token %6) ]
call void @__cxa_end_catch() [ "funclet"(token %6) ]
catchret from %6 to label %try.cont7
rethrow: ; preds = %catch.start3
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %6) ]
unreachable
try.cont7: ; preds = %try.cont, %catch4
ret void
}
; A nested try-catch within a catch. The outer catch catches 'int'.
;
; void foo();
; void test2() {
; try {
; foo();
; } catch (int) {
; try {
; foo();
; } catch (int) {
; }
; }
; }
; Within the nested catchpad, wasm.lsda() call should NOT be generated.
define void @test2() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test2()
entry:
invoke void @foo()
to label %try.cont9 unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
; CHECK: catch.start:
; CHECK: call i8* @llvm.wasm.lsda()
catch: ; preds = %catch.start
%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
invoke void @foo() [ "funclet"(token %1) ]
to label %try.cont unwind label %catch.dispatch2
catch.dispatch2: ; preds = %catch
%6 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup
catch.start3: ; preds = %catch.dispatch2
%7 = catchpad within %6 [i8* bitcast (i8** @_ZTIi to i8*)]
%8 = call i8* @llvm.wasm.get.exception(token %7)
%9 = call i32 @llvm.wasm.get.ehselector(token %7)
%10 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches4 = icmp eq i32 %9, %10
br i1 %matches4, label %catch6, label %rethrow5
; CHECK: catch.start3:
; CHECK-NOT: call i8* @llvm.wasm.lsda()
catch6: ; preds = %catch.start3
%11 = call i8* @__cxa_begin_catch(i8* %8) [ "funclet"(token %7) ]
call void @__cxa_end_catch() [ "funclet"(token %7) ]
catchret from %7 to label %try.cont
rethrow5: ; preds = %catch.start3
invoke void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %7) ]
to label %unreachable unwind label %ehcleanup
try.cont: ; preds = %catch, %catch6
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont9
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ]
unreachable
try.cont9: ; preds = %entry, %try.cont
ret void
ehcleanup: ; preds = %rethrow5, %catch.dispatch2
%12 = cleanuppad within %1 []
call void @__cxa_end_catch() [ "funclet"(token %12) ]
cleanupret from %12 unwind to caller
; CHECK: ehcleanup:
; CHECK-NEXT: cleanuppad
; CHECK-NOT: call void @llvm.wasm.landingpad.index
; CHECK-NOT: store {{.*}} @__wasm_lpad_context
; CHECK-NOT: call i8* @llvm.wasm.lsda()
; CHECK-NOT: call i32 @_Unwind_CallPersonality
; CHECK-NOT: load {{.*}} @__wasm_lpad_context
unreachable: ; preds = %rethrow5
unreachable
}
; A nested try-catch within a catch. The outer catch is (...).
;
; void foo();
; void test2() {
; try {
; foo();
; } catch (...) {
; try {
; foo();
; } catch (int) {
; }
; }
; }
; Within the innermost catchpad, wasm.lsda() call should be generated, because
; the outer catch is 'catch (...)', which does not need wasm.lsda() call.
define void @test3() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test3()
entry:
invoke void @foo()
to label %try.cont8 unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
invoke void @foo() [ "funclet"(token %1) ]
to label %try.cont unwind label %catch.dispatch2
; CHECK: catch.start:
; CHECK-NOT: call i8* @llvm.wasm.lsda()
catch.dispatch2: ; preds = %catch.start
%5 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup
catch.start3: ; preds = %catch.dispatch2
%6 = catchpad within %5 [i8* bitcast (i8** @_ZTIi to i8*)]
%7 = call i8* @llvm.wasm.get.exception(token %6)
%8 = call i32 @llvm.wasm.get.ehselector(token %6)
%9 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %8, %9
br i1 %matches, label %catch4, label %rethrow
; CHECK: catch.start3:
; CHECK: call i8* @llvm.wasm.lsda()
catch4: ; preds = %catch.start3
%10 = call i8* @__cxa_begin_catch(i8* %7) [ "funclet"(token %6) ]
%11 = bitcast i8* %10 to i32*
%12 = load i32, i32* %11, align 4
call void @__cxa_end_catch() [ "funclet"(token %6) ]
catchret from %6 to label %try.cont
rethrow: ; preds = %catch.start3
invoke void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %6) ]
to label %unreachable unwind label %ehcleanup
try.cont: ; preds = %catch.start, %catch4
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont8
try.cont8: ; preds = %entry, %try.cont
ret void
ehcleanup: ; preds = %rethrow, %catch.dispatch2
%13 = cleanuppad within %1 []
invoke void @__cxa_end_catch() [ "funclet"(token %13) ]
to label %invoke.cont6 unwind label %terminate
invoke.cont6: ; preds = %ehcleanup
cleanupret from %13 unwind to caller
unreachable: ; preds = %rethrow
unreachable
terminate: ; preds = %ehcleanup
%14 = cleanuppad within %13 []
%15 = call i8* @llvm.wasm.get.exception(token %14)
call void @__clang_call_terminate(i8* %15) [ "funclet"(token %14) ]
unreachable
}
; void foo();
; void test4() {
; try {
; foo();
; } catch (int) {
; try {
; foo();
; } catch (...) {
; try {
; foo();
; } catch (int) {
; }
; }
; }
; }
; wasm.lsda() call should be generated only once in the outermost catchpad. The
; innermost 'catch (int)' can reuse the wasm.lsda() generated in the outermost
; catch.
define void @test4() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test4()
entry:
invoke void @foo()
to label %try.cont19 unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
; CHECK: catch.start:
; CHECK: call i8* @llvm.wasm.lsda()
catch: ; preds = %catch.start
%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
%6 = bitcast i8* %5 to i32*
%7 = load i32, i32* %6, align 4
invoke void @foo() [ "funclet"(token %1) ]
to label %try.cont16 unwind label %catch.dispatch2
catch.dispatch2: ; preds = %catch
%8 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup17
catch.start3: ; preds = %catch.dispatch2
%9 = catchpad within %8 [i8* null]
%10 = call i8* @llvm.wasm.get.exception(token %9)
%11 = call i32 @llvm.wasm.get.ehselector(token %9)
%12 = call i8* @__cxa_begin_catch(i8* %10) [ "funclet"(token %9) ]
invoke void @foo() [ "funclet"(token %9) ]
to label %try.cont unwind label %catch.dispatch7
; CHECK: catch.start3:
; CHECK-NOT: call i8* @llvm.wasm.lsda()
catch.dispatch7: ; preds = %catch.start3
%13 = catchswitch within %9 [label %catch.start8] unwind label %ehcleanup
catch.start8: ; preds = %catch.dispatch7
%14 = catchpad within %13 [i8* bitcast (i8** @_ZTIi to i8*)]
%15 = call i8* @llvm.wasm.get.exception(token %14)
%16 = call i32 @llvm.wasm.get.ehselector(token %14)
%17 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches9 = icmp eq i32 %16, %17
br i1 %matches9, label %catch11, label %rethrow10
; CHECK: catch.start8:
; CHECK-NOT: call i8* @llvm.wasm.lsda()
catch11: ; preds = %catch.start8
%18 = call i8* @__cxa_begin_catch(i8* %15) [ "funclet"(token %14) ]
%19 = bitcast i8* %18 to i32*
%20 = load i32, i32* %19, align 4
call void @__cxa_end_catch() [ "funclet"(token %14) ]
catchret from %14 to label %try.cont
rethrow10: ; preds = %catch.start8
invoke void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %14) ]
to label %unreachable unwind label %ehcleanup
try.cont: ; preds = %catch.start3, %catch11
invoke void @__cxa_end_catch() [ "funclet"(token %9) ]
to label %invoke.cont13 unwind label %ehcleanup17
invoke.cont13: ; preds = %try.cont
catchret from %9 to label %try.cont16
try.cont16: ; preds = %catch, %invoke.cont13
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont19
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ]
unreachable
try.cont19: ; preds = %entry, %try.cont16
ret void
ehcleanup: ; preds = %rethrow10, %catch.dispatch7
%21 = cleanuppad within %9 []
invoke void @__cxa_end_catch() [ "funclet"(token %21) ]
to label %invoke.cont14 unwind label %terminate
invoke.cont14: ; preds = %ehcleanup
cleanupret from %21 unwind label %ehcleanup17
ehcleanup17: ; preds = %invoke.cont14, %try.cont, %catch.dispatch2
%22 = cleanuppad within %1 []
call void @__cxa_end_catch() [ "funclet"(token %22) ]
cleanupret from %22 unwind to caller
unreachable: ; preds = %rethrow10
unreachable
terminate: ; preds = %ehcleanup
%23 = cleanuppad within %21 []
%24 = call i8* @llvm.wasm.get.exception(token %23)
call void @__clang_call_terminate(i8* %24) [ "funclet"(token %23) ]
unreachable
}
; A cleanuppad with a call to __clang_call_terminate().
;
; void foo();
; void test5() {
; try {
; foo();
; } catch (...) {
; foo();
; }
; }
define void @test5() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test5
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
invoke void @foo() [ "funclet"(token %1) ]
to label %invoke.cont1 unwind label %ehcleanup
invoke.cont1: ; preds = %catch.start
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
try.cont: ; preds = %entry, %invoke.cont1
ret void
ehcleanup: ; preds = %catch.start
%5 = cleanuppad within %1 []
invoke void @__cxa_end_catch() [ "funclet"(token %5) ]
to label %invoke.cont2 unwind label %terminate
invoke.cont2: ; preds = %ehcleanup
cleanupret from %5 unwind to caller
terminate: ; preds = %ehcleanup
%6 = cleanuppad within %5 []
%7 = call i8* @llvm.wasm.get.exception(token %6)
call void @__clang_call_terminate(i8* %7) [ "funclet"(token %6) ]
unreachable
; CHECK: terminate:
; CHECK-NEXT: cleanuppad
; CHECK-NEXT: %[[EXN:.*]] = call i8* @llvm.wasm.extract.exception
; CHECK-NEXT: call void @__clang_call_terminate(i8* %[[EXN]])
}
; PHI demotion test. Only the phi before catchswitch should be demoted; the phi
; before cleanuppad should NOT.
;
; void foo();
; int bar(int) noexcept;
; struct Temp {
; ~Temp() {}
; };
;
; void test6() {
; int num;
; try {
; Temp t;
; num = 1;
; foo();
; num = 2;
; foo();
; } catch (...) {
; bar(num);
; }
; try {
; foo();
; num = 1;
; foo();
; num = 2;
; } catch (...) {
; bar(num);
; }
; }
define void @test6() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test6
entry:
%t = alloca %struct.Temp, align 1
invoke void @foo()
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
invoke void @foo()
to label %invoke.cont1 unwind label %ehcleanup
invoke.cont1: ; preds = %invoke.cont
%call = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t)
br label %try.cont
ehcleanup: ; preds = %invoke.cont, %entry
%num.0 = phi i32 [ 2, %invoke.cont ], [ 1, %entry ]
%0 = cleanuppad within none []
%call2 = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t) [ "funclet"(token %0) ]
cleanupret from %0 unwind label %catch.dispatch
; CHECK: ehcleanup:
; CHECK-NEXT: = phi
catch.dispatch: ; preds = %ehcleanup
%1 = catchswitch within none [label %catch.start] unwind to caller
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) ]
call void @bar(i32 %num.0) [ "funclet"(token %2) ]
call void @__cxa_end_catch() [ "funclet"(token %2) ]
catchret from %2 to label %try.cont
try.cont: ; preds = %catch.start, %invoke.cont1
invoke void @foo()
to label %invoke.cont3 unwind label %catch.dispatch5
invoke.cont3: ; preds = %try.cont
invoke void @foo()
to label %try.cont10 unwind label %catch.dispatch5
catch.dispatch5: ; preds = %invoke.cont3, %try.cont
%num.1 = phi i32 [ 2, %invoke.cont3 ], [ 1, %try.cont ]
%6 = catchswitch within none [label %catch.start6] unwind to caller
; CHECK: catch.dispatch5:
; CHECK-NOT: = phi
catch.start6: ; preds = %catch.dispatch5
%7 = catchpad within %6 [i8* null]
%8 = call i8* @llvm.wasm.get.exception(token %7)
%9 = call i32 @llvm.wasm.get.ehselector(token %7)
%10 = call i8* @__cxa_begin_catch(i8* %8) [ "funclet"(token %7) ]
call void @bar(i32 %num.1) [ "funclet"(token %7) ]
call void @__cxa_end_catch() [ "funclet"(token %7) ]
catchret from %7 to label %try.cont10
try.cont10: ; preds = %invoke.cont3, %catch.start6
ret void
}
; Tests if instructions after a call to @llvm.wasm.throw are deleted and the
; BB's dead children are deleted.
; CHECK-LABEL: @test7
define i32 @test7(i1 %b, i8* %p) {
entry:
br i1 %b, label %bb.true, label %bb.false
; CHECK: bb.true:
; CHECK-NEXT: call void @llvm.wasm.throw(i32 0, i8* %p)
; CHECK-NEXT: unreachable
bb.true: ; preds = %entry
call void @llvm.wasm.throw(i32 0, i8* %p)
br label %bb.true.0
; CHECK-NOT: bb.true.0
bb.true.0: ; preds = %bb.true
br label %merge
; CHECK: bb.false
bb.false: ; preds = %entry
br label %merge
; CHECK: merge
merge: ; preds = %bb.true.0, %bb.false
ret i32 0
}
declare void @foo()
declare void @bar(i32)
declare %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* returned)
declare i32 @__gxx_wasm_personality_v0(...)
declare i8* @llvm.wasm.get.exception(token)
declare i32 @llvm.wasm.get.ehselector(token)
declare i32 @llvm.eh.typeid.for(i8*)
declare void @llvm.wasm.throw(i32, i8*)
declare void @llvm.wasm.rethrow.in.catch()
declare i8* @__cxa_begin_catch(i8*)
declare void @__cxa_end_catch()
declare void @__clang_call_terminate(i8*)
; CHECK-DAG: declare void @llvm.wasm.landingpad.index(token, i32 immarg)
; CHECK-DAG: declare i8* @llvm.wasm.lsda()
; CHECK-DAG: declare i32 @_Unwind_CallPersonality(i8*)
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