; REQUIRES: asserts ; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling | FileCheck %s ; RUN: llc < %s -disable-wasm-fallthrough-return-opt -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling ; RUN: llc < %s -O0 -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -verify-machineinstrs -exception-model=wasm -mattr=+exception-handling | FileCheck %s --check-prefix=NOOPT ; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort | FileCheck %s --check-prefix=NOSORT ; RUN: llc < %s -disable-wasm-fallthrough-return-opt -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort | FileCheck %s --check-prefix=NOSORT-LOCALS ; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort -stats 2>&1 | FileCheck %s --check-prefix=NOSORT-STAT target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" target triple = "wasm32-unknown-unknown" @_ZTIi = external constant i8* @_ZTId = external constant i8* ; Simple test case with two catch clauses ; ; void foo(); ; void test0() { ; try { ; foo(); ; } catch (int) { ; } catch (double) { ; } ; } ; CHECK-LABEL: test0 ; CHECK: try ; CHECK: call foo ; CHECK: catch ; CHECK: block ; CHECK: br_if 0, {{.*}} # 0: down to label2 ; CHECK: call $drop=, __cxa_begin_catch ; CHECK: call __cxa_end_catch ; CHECK: br 1 # 1: down to label0 ; CHECK: end_block # label2: ; CHECK: block ; CHECK: br_if 0, {{.*}} # 0: down to label3 ; CHECK: call $drop=, __cxa_begin_catch ; CHECK: call __cxa_end_catch ; CHECK: br 1 # 1: down to label0 ; CHECK: end_block # label3: ; CHECK: rethrow {{.*}} # to caller ; CHECK: end_try # label0: define void @test0() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 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*), i8* bitcast (i8** @_ZTId 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 %catch2, label %catch.fallthrough catch2: ; 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 catch.fallthrough: ; preds = %catch.start %6 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTId to i8*)) %matches1 = icmp eq i32 %3, %6 br i1 %matches1, label %catch, label %rethrow catch: ; preds = %catch.fallthrough %7 = 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 rethrow: ; preds = %catch.fallthrough call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ] unreachable try.cont: ; preds = %catch, %catch2, %entry ret void } ; Nested try-catches within a catch ; void test1() { ; try { ; foo(); ; } catch (int) { ; try { ; foo(); ; } catch (int) { ; foo(); ; } ; } ; } ; CHECK-LABEL: test1 ; CHECK: try ; CHECK: call foo ; CHECK: catch ; CHECK: block ; CHECK: block ; CHECK: br_if 0, {{.*}} # 0: down to label7 ; CHECK: call $drop=, __cxa_begin_catch ; CHECK: try ; CHECK: call foo ; CHECK: br 2 # 2: down to label6 ; CHECK: catch ; CHECK: try ; CHECK: block ; CHECK: br_if 0, {{.*}} # 0: down to label11 ; CHECK: call $drop=, __cxa_begin_catch ; CHECK: try ; CHECK: call foo ; CHECK: br 2 # 2: down to label9 ; CHECK: catch ; CHECK: call __cxa_end_catch ; CHECK: rethrow {{.*}} # down to catch3 ; CHECK: end_try ; CHECK: end_block # label11: ; CHECK: rethrow {{.*}} # down to catch3 ; CHECK: catch {{.*}} # catch3: ; CHECK: call __cxa_end_catch ; CHECK: rethrow {{.*}} # to caller ; CHECK: end_try # label9: ; CHECK: call __cxa_end_catch ; CHECK: br 2 # 2: down to label6 ; CHECK: end_try ; CHECK: end_block # label7: ; CHECK: rethrow {{.*}} # to caller ; CHECK: end_block # label6: ; CHECK: call __cxa_end_catch ; CHECK: end_try define void @test1() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: invoke void @foo() to label %try.cont11 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 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.cont unwind label %catch.dispatch2 catch.dispatch2: ; preds = %catch %8 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup9 catch.start3: ; preds = %catch.dispatch2 %9 = catchpad within %8 [i8* bitcast (i8** @_ZTIi to i8*)] %10 = call i8* @llvm.wasm.get.exception(token %9) %11 = call i32 @llvm.wasm.get.ehselector(token %9) %12 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) %matches4 = icmp eq i32 %11, %12 br i1 %matches4, label %catch6, label %rethrow5 catch6: ; preds = %catch.start3 %13 = call i8* @__cxa_begin_catch(i8* %10) [ "funclet"(token %9) ] %14 = bitcast i8* %13 to i32* %15 = load i32, i32* %14, align 4 invoke void @foo() [ "funclet"(token %9) ] to label %invoke.cont8 unwind label %ehcleanup invoke.cont8: ; preds = %catch6 call void @__cxa_end_catch() [ "funclet"(token %9) ] catchret from %9 to label %try.cont rethrow5: ; preds = %catch.start3 invoke void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %9) ] to label %unreachable unwind label %ehcleanup9 try.cont: ; preds = %invoke.cont8, %catch call void @__cxa_end_catch() [ "funclet"(token %1) ] catchret from %1 to label %try.cont11 rethrow: ; preds = %catch.start call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ] unreachable try.cont11: ; preds = %try.cont, %entry ret void ehcleanup: ; preds = %catch6 %16 = cleanuppad within %9 [] call void @__cxa_end_catch() [ "funclet"(token %16) ] cleanupret from %16 unwind label %ehcleanup9 ehcleanup9: ; preds = %ehcleanup, %rethrow5, %catch.dispatch2 %17 = cleanuppad within %1 [] call void @__cxa_end_catch() [ "funclet"(token %17) ] cleanupret from %17 unwind to caller unreachable: ; preds = %rethrow5 unreachable } ; Nested loop within a catch clause ; void test2() { ; try { ; foo(); ; } catch (...) { ; for (int i = 0; i < 50; i++) ; foo(); ; } ; } ; CHECK-LABEL: test2 ; CHECK: try ; CHECK: call foo ; CHECK: catch ; CHECK: call $drop=, __cxa_begin_catch ; CHECK: loop # label15: ; CHECK: block ; CHECK: block ; CHECK: br_if 0, {{.*}} # 0: down to label17 ; CHECK: try ; CHECK: call foo ; CHECK: br 2 # 2: down to label16 ; CHECK: catch ; CHECK: try ; CHECK: call __cxa_end_catch ; CHECK: catch ; CHECK: call __clang_call_terminate ; CHECK: unreachable ; CHECK: end_try ; CHECK: rethrow {{.*}} # to caller ; CHECK: end_try ; CHECK: end_block # label17: ; CHECK: call __cxa_end_catch ; CHECK: br 2 # 2: down to label13 ; CHECK: end_block # label16: ; CHECK: br 0 # 0: up to label15 ; CHECK: end_loop ; CHECK: end_try # label13: define void @test2() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 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) ] br label %for.cond for.cond: ; preds = %for.inc, %catch.start %i.0 = phi i32 [ 0, %catch.start ], [ %inc, %for.inc ] %cmp = icmp slt i32 %i.0, 50 br i1 %cmp, label %for.body, label %for.end for.body: ; preds = %for.cond invoke void @foo() [ "funclet"(token %1) ] to label %for.inc unwind label %ehcleanup for.inc: ; preds = %for.body %inc = add nsw i32 %i.0, 1 br label %for.cond for.end: ; preds = %for.cond call void @__cxa_end_catch() [ "funclet"(token %1) ] catchret from %1 to label %try.cont try.cont: ; preds = %for.end, %entry ret void ehcleanup: ; preds = %for.body %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 } ; Tests if block and try markers are correctly placed. Even if two predecessors ; of the EH pad are bb2 and bb3 and their nearest common dominator is bb1, the ; TRY marker should be placed at bb0 because there's a branch from bb0 to bb2, ; and scopes cannot be interleaved. ; NOOPT-LABEL: test3 ; NOOPT: try ; NOOPT: block ; NOOPT: block ; NOOPT: block ; NOOPT: end_block ; NOOPT: end_block ; NOOPT: call foo ; NOOPT: end_block ; NOOPT: call bar ; NOOPT: catch {{.*}} ; NOOPT: end_try define void @test3() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { bb0: br i1 undef, label %bb1, label %bb2 bb1: ; preds = %bb0 br i1 undef, label %bb3, label %bb4 bb2: ; preds = %bb0 br label %try.cont bb3: ; preds = %bb1 invoke void @foo() to label %try.cont unwind label %catch.dispatch bb4: ; preds = %bb1 invoke void @bar() to label %try.cont unwind label %catch.dispatch catch.dispatch: ; preds = %bb4, %bb3 %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) catchret from %1 to label %try.cont try.cont: ; preds = %catch.start, %bb4, %bb3, %bb2 ret void } ; Tests if try/end_try markers are placed correctly wrt loop/end_loop markers, ; when try and loop markers are in the same BB and end_try and end_loop are in ; another BB. ; CHECK: loop ; CHECK: try ; CHECK: call foo ; CHECK: catch ; CHECK: end_try ; CHECK: end_loop define void @test4(i32* %p) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: store volatile i32 0, i32* %p br label %loop loop: ; preds = %try.cont, %entry store volatile i32 1, i32* %p invoke void @foo() to label %try.cont unwind label %catch.dispatch catch.dispatch: ; preds = %loop %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) catchret from %1 to label %try.cont try.cont: ; preds = %catch.start, %loop br label %loop } ; Some of test cases below are hand-tweaked by deleting some library calls to ; simplify tests and changing the order of basic blocks to cause unwind ; destination mismatches. And we use -wasm-disable-ehpad-sort to create maximum ; number of mismatches in several tests below. ; 'call bar''s original unwind destination was 'catch14', but after control flow ; linearization, its unwind destination incorrectly becomes 'catch15'. We fix ; this by wrapping the call with a nested try/catch/end_try and branching to the ; right destination (label32). ; NOSORT-LABEL: test5 ; NOSORT: block ; NOSORT: try ; NOSORT: try ; NOSORT: call foo ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT: call bar ; NOSORT: catch $drop= ; NOSORT: br 2 # 2: down to label32 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: br 2 # 2: down to label31 ; NOSORT: catch $drop= # catch15: ; NOSORT: br 2 # 2: down to label31 ; NOSORT: end_try ; NOSORT: catch $drop= # catch14: ; NOSORT: end_try # label32: ; NOSORT: end_block # label31: ; NOSORT: return define void @test5() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { bb0: invoke void @foo() to label %bb1 unwind label %catch.dispatch0 bb1: ; preds = %bb0 invoke void @bar() to label %try.cont unwind label %catch.dispatch1 catch.dispatch0: ; preds = %bb0 %0 = catchswitch within none [label %catch.start0] unwind to caller catch.start0: ; preds = %catch.dispatch0 %1 = catchpad within %0 [i8* null] %2 = call i8* @llvm.wasm.get.exception(token %1) %3 = call i32 @llvm.wasm.get.ehselector(token %1) catchret from %1 to label %try.cont catch.dispatch1: ; preds = %bb1 %4 = catchswitch within none [label %catch.start1] unwind to caller catch.start1: ; preds = %catch.dispatch1 %5 = catchpad within %4 [i8* null] %6 = call i8* @llvm.wasm.get.exception(token %5) %7 = call i32 @llvm.wasm.get.ehselector(token %5) catchret from %5 to label %try.cont try.cont: ; preds = %catch.start1, %catch.start0, %bb1 ret void } ; Two 'call bar''s original unwind destination was the caller, but after control ; flow linearization, their unwind destination incorrectly becomes 'catch17'. We ; fix this by wrapping the call with a nested try/catch/end_try and branching to ; the right destination (label4), from which we rethrow the exception to the ; caller. ; And the return value of 'baz' should NOT be stackified because the BB is split ; during fixing unwind mismatches. ; NOSORT-LABEL: test6 ; NOSORT: try ; NOSORT: call foo ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT: call bar ; NOSORT: call ${{[0-9]+}}=, baz ; NOSORT-NOT: call $push{{.*}}=, baz ; NOSORT: catch $[[REG:[0-9]+]]= ; NOSORT: br 1 # 1: down to label35 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: return ; NOSORT: catch $drop= # catch17: ; NOSORT: return ; NOSORT: end_try # label35: ; NOSORT: rethrow $[[REG]] # to caller define void @test6() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { bb0: invoke void @foo() to label %bb1 unwind label %catch.dispatch0 bb1: ; preds = %bb0 call void @bar() %call = call i32 @baz() call void @nothrow(i32 %call) #0 ret void catch.dispatch0: ; preds = %bb0 %0 = catchswitch within none [label %catch.start0] unwind to caller catch.start0: ; preds = %catch.dispatch0 %1 = catchpad within %0 [i8* null] %2 = call i8* @llvm.wasm.get.exception(token %1) %3 = call i32 @llvm.wasm.get.ehselector(token %1) catchret from %1 to label %try.cont try.cont: ; preds = %catch.start0 ret void } ; Similar situation as @test6. Here 'call @qux''s original unwind destination ; was the caller, but after control flow linearization, their unwind destination ; incorrectly becomes another catch within the function. We fix this by wrapping ; the call with a nested try/catch/end_try and branching to the right ; destination, from which we rethrow the exception to the caller. ; Because 'call @qux' pops an argument pushed by 'i32.const 5' from stack, the ; nested 'try' should be placed before `i32.const 5', not between 'i32.const 5' ; and 'call @qux'. ; NOSORT-LABEL: test7 ; NOSORT: try ; NOSORT: call foo ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT-NEXT: i32.const $push{{[0-9]+}}=, 5 ; NOSORT-NEXT: call ${{[0-9]+}}=, qux ; NOSORT: catch $[[REG:[0-9]+]]= ; NOSORT: br 1 # 1: down to label37 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: return ; NOSORT: catch $drop= # catch19: ; NOSORT: return ; NOSORT: end_try # label37: ; NOSORT: rethrow $[[REG]] # to caller define i32 @test7() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { bb0: invoke void @foo() to label %bb1 unwind label %catch.dispatch0 bb1: ; preds = %bb0 %0 = call i32 @qux(i32 5) ret i32 %0 catch.dispatch0: ; preds = %bb0 %1 = catchswitch within none [label %catch.start0] unwind to caller catch.start0: ; preds = %catch.dispatch0 %2 = catchpad within %1 [i8* null] %3 = call i8* @llvm.wasm.get.exception(token %2) %j = call i32 @llvm.wasm.get.ehselector(token %2) catchret from %2 to label %try.cont try.cont: ; preds = %catch.start0 ret i32 0 } ; Tests the case when TEE stackifies a register in RegStackify but it gets ; unstackified in fixUnwindMismatches in CFGStackify. ; NOSORT-LOCALS-LABEL: test8 define void @test8(i32 %x) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { bb0: invoke void @foo() to label %bb1 unwind label %catch.dispatch0 bb1: ; preds = %bb0 %t = add i32 %x, 4 ; This %addr is used in multiple places, so tee is introduced in RegStackify, ; which stackifies the use of %addr in store instruction. A tee has two dest ; registers, the first of which is stackified and the second is not. ; But when we introduce a nested try-catch in fixUnwindMismatches in ; CFGStackify, it is possible that we end up unstackifying the first dest ; register. In that case, we convert that tee into a copy. %addr = inttoptr i32 %t to i32* %load = load i32, i32* %addr %call = call i32 @baz() %add = add i32 %load, %call store i32 %add, i32* %addr ret void ; NOSORT-LOCALS: i32.add ; NOSORT-LOCALS-NOT: local.tee ; NOSORT-LOCALS-NEXT: local.set catch.dispatch0: ; preds = %bb0 %0 = catchswitch within none [label %catch.start0] unwind to caller catch.start0: ; preds = %catch.dispatch0 %1 = catchpad within %0 [i8* null] %2 = call i8* @llvm.wasm.get.exception(token %1) %3 = call i32 @llvm.wasm.get.ehselector(token %1) catchret from %1 to label %try.cont try.cont: ; preds = %catch.start0 ret void } ; If not for the unwind destination mismatch, the LOOP marker here would have an ; i32 signature. But because we add a rethrow instruction at the end of the ; appendix block, now the LOOP marker does not have a signature (= has a void ; signature). Here the two calls two 'bar' are supposed to throw up to the ; caller, but incorrectly unwind to 'catch19' after linearizing the CFG. ; NOSORT-LABEL: test9 ; NOSORT: block ; NOSORT-NOT: loop i32 ; NOSORT: loop # label42: ; NOSORT: try ; NOSORT: call foo ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT: call bar ; NOSORT: call bar ; NOSORT: catch $[[REG:[0-9]+]]= ; NOSORT: br 1 # 1: down to label43 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: return {{.*}} ; NOSORT: catch $drop= # catch23: ; NOSORT: br 1 # 1: up to label42 ; NOSORT: end_try # label43: ; NOSORT: end_loop ; NOSORT: end_block ; NOSORT: rethrow $[[REG]] # to caller define i32 @test9(i32* %p) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: store volatile i32 0, i32* %p br label %loop loop: ; preds = %try.cont, %entry store volatile i32 1, i32* %p invoke void @foo() to label %bb unwind label %catch.dispatch bb: ; preds = %loop call void @bar() call void @bar() ret i32 0 catch.dispatch: ; preds = %loop %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) catchret from %1 to label %try.cont try.cont: ; preds = %catch.start br label %loop } ; When we have both kinds of EH pad unwind mismatches: ; - A may-throw instruction unwinds to an incorrect EH pad after linearizing the ; CFG, when it is supposed to unwind to another EH pad. ; - A may-throw instruction unwinds to an incorrect EH pad after linearizing the ; CFG, when it is supposed to unwind to the caller. ; NOSORT-LABEL: test10 ; NOSORT: block ; NOSORT: block ; NOSORT: try ; NOSORT: try ; NOSORT: call foo ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT: call bar ; NOSORT: catch $[[REG0:[0-9]+]]= ; NOSORT: br 2 # 2: down to label47 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: br 2 # 2: down to label46 ; NOSORT: catch {{.*}} ; NOSORT: block i32 ; NOSORT: br_on_exn 0, {{.*}} # 0: down to label50 ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT: rethrow {{.*}} # down to catch28 ; NOSORT: catch $[[REG1:[0-9]+]]= # catch28: ; NOSORT: br 5 # 5: down to label45 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: end_block # label50: ; NOSORT: call $drop=, __cxa_begin_catch ; --- Nested try/catch/end_try starts ; NOSORT: try ; NOSORT: call __cxa_end_catch ; NOSORT: catch $[[REG1]]= ; NOSORT: br 4 # 4: down to label45 ; NOSORT: end_try ; --- Nested try/catch/end_try ends ; NOSORT: br 2 # 2: down to label46 ; NOSORT: end_try ; NOSORT: catch $[[REG0]]= ; NOSORT: end_try # label47: ; NOSORT: call $drop=, __cxa_begin_catch ; NOSORT: call __cxa_end_catch ; NOSORT: end_block # label46: ; NOSORT: return ; NOSORT: end_block # label45: ; NOSORT: rethrow $[[REG1]] # to caller define void @test10() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { bb0: invoke void @foo() to label %bb1 unwind label %catch.dispatch0 bb1: ; preds = %bb0 invoke void @bar() to label %try.cont unwind label %catch.dispatch1 catch.dispatch0: ; preds = %bb0 %0 = catchswitch within none [label %catch.start0] unwind to caller catch.start0: ; preds = %catch.dispatch0 %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 catch.dispatch1: ; preds = %bb1 %5 = catchswitch within none [label %catch.start1] unwind to caller catch.start1: ; preds = %catch.dispatch1 %6 = catchpad within %5 [i8* null] %7 = call i8* @llvm.wasm.get.exception(token %6) %8 = call i32 @llvm.wasm.get.ehselector(token %6) %9 = call i8* @__cxa_begin_catch(i8* %7) [ "funclet"(token %6) ] call void @__cxa_end_catch() [ "funclet"(token %6) ] catchret from %6 to label %try.cont try.cont: ; preds = %catch.start1, %catch.start0, %bb1 ret void } ; In CFGSort, EH pads should be sorted as soon as it is available and ; 'Preferred' queue and should NOT be entered into 'Ready' queue unless we are ; in the middle of sorting another region that does not contain the EH pad. In ; this example, 'catch.start' should be sorted right after 'if.then' is sorted ; (before 'cont' is sorted) and there should not be any unwind destination ; mismatches in CFGStackify. ; NOOPT: block ; NOOPT: try ; NOOPT: call foo ; NOOPT: catch ; NOOPT: end_try ; NOOPT: call foo ; NOOPT: end_block ; NOOPT: return define void @test11(i32 %arg) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: %tobool = icmp ne i32 %arg, 0 br i1 %tobool, label %if.then, label %if.end catch.dispatch: ; preds = %if.then %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 %if.end if.then: ; preds = %entry invoke void @foo() to label %cont unwind label %catch.dispatch cont: ; preds = %if.then call void @foo() br label %if.end if.end: ; preds = %cont, %catch.start, %entry ret void } %class.Object = type { i8 } ; Intrinsics like memcpy, memmove, and memset don't throw and are lowered into ; calls to external symbols (not global addresses) in instruction selection, ; which will be eventually lowered to library function calls. ; Because this test runs with -wasm-disable-ehpad-sort, these library calls in ; invoke.cont BB fall within try~end_try, but they shouldn't cause crashes or ; unwinding destination mismatches in CFGStackify. ; NOSORT-LABEL: test12 ; NOSORT: try ; NOSORT: call foo ; NOSORT: call {{.*}} memcpy ; NOSORT: call {{.*}} memmove ; NOSORT: call {{.*}} memset ; NOSORT: return ; NOSORT: catch ; NOSORT: rethrow ; NOSORT: end_try define void @test12(i8* %a, i8* %b) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: %o = alloca %class.Object, align 1 invoke void @foo() to label %invoke.cont unwind label %ehcleanup invoke.cont: ; preds = %entry call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %b, i32 100, i1 false) call void @llvm.memmove.p0i8.p0i8.i32(i8* %a, i8* %b, i32 100, i1 false) call void @llvm.memset.p0i8.i32(i8* %a, i8 0, i32 100, i1 false) %call = call %class.Object* @_ZN6ObjectD2Ev(%class.Object* %o) #1 ret void ehcleanup: ; preds = %entry %0 = cleanuppad within none [] %call2 = call %class.Object* @_ZN6ObjectD2Ev(%class.Object* %o) #1 [ "funclet"(token %0) ] cleanupret from %0 unwind to caller } ; Tests if 'try' marker is placed correctly. In this test, 'try' should be ; placed before the call to 'nothrow_i32' and not between the call to ; 'nothrow_i32' and 'fun', because the return value of 'nothrow_i32' is ; stackified and pushed onto the stack to be consumed by the call to 'fun'. ; CHECK-LABEL: test13 ; CHECK: try ; CHECK: call $push{{.*}}=, nothrow_i32 ; CHECK: call fun, $pop{{.*}} define void @test13() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: %call = call i32 @nothrow_i32() invoke void @fun(i32 %call) to label %invoke.cont unwind label %terminate invoke.cont: ; preds = %entry ret void terminate: ; preds = %entry %0 = cleanuppad within none [] %1 = tail call i8* @llvm.wasm.get.exception(token %0) call void @__clang_call_terminate(i8* %1) [ "funclet"(token %0) ] unreachable } %class.MyClass = type { i32 } ; This crashed on debug mode (= when NDEBUG is not defined) when the logic for ; computing the innermost region was not correct, in which a loop region ; contains an exception region. This should pass CFGSort without crashing. define void @test14() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: %e = alloca %class.MyClass, align 4 br label %for.cond for.cond: ; preds = %for.inc, %entry %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] %cmp = icmp slt i32 %i.0, 9 br i1 %cmp, label %for.body, label %for.end for.body: ; preds = %for.cond invoke void @quux(i32 %i.0) to label %for.inc unwind label %catch.dispatch catch.dispatch: ; preds = %for.body %0 = catchswitch within none [label %catch.start] unwind to caller catch.start: ; preds = %catch.dispatch %1 = catchpad within %0 [i8* bitcast ({ i8*, i8* }* @_ZTI7MyClass 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*, i8* }* @_ZTI7MyClass to i8*)) #3 %matches = icmp eq i32 %3, %4 br i1 %matches, label %catch, label %rethrow catch: ; preds = %catch.start %5 = call i8* @__cxa_get_exception_ptr(i8* %2) #3 [ "funclet"(token %1) ] %6 = bitcast i8* %5 to %class.MyClass* %call = call %class.MyClass* @_ZN7MyClassC2ERKS_(%class.MyClass* %e, %class.MyClass* dereferenceable(4) %6) [ "funclet"(token %1) ] %7 = call i8* @__cxa_begin_catch(i8* %2) #3 [ "funclet"(token %1) ] %x = getelementptr inbounds %class.MyClass, %class.MyClass* %e, i32 0, i32 0 %8 = load i32, i32* %x, align 4 invoke void @quux(i32 %8) [ "funclet"(token %1) ] to label %invoke.cont2 unwind label %ehcleanup invoke.cont2: ; preds = %catch %call3 = call %class.MyClass* @_ZN7MyClassD2Ev(%class.MyClass* %e) #3 [ "funclet"(token %1) ] call void @__cxa_end_catch() [ "funclet"(token %1) ] catchret from %1 to label %for.inc rethrow: ; preds = %catch.start call void @llvm.wasm.rethrow.in.catch() #6 [ "funclet"(token %1) ] unreachable for.inc: ; preds = %invoke.cont2, %for.body %inc = add nsw i32 %i.0, 1 br label %for.cond ehcleanup: ; preds = %catch %9 = cleanuppad within %1 [] %call4 = call %class.MyClass* @_ZN7MyClassD2Ev(%class.MyClass* %e) #3 [ "funclet"(token %9) ] invoke void @__cxa_end_catch() [ "funclet"(token %9) ] to label %invoke.cont6 unwind label %terminate7 invoke.cont6: ; preds = %ehcleanup cleanupret from %9 unwind to caller for.end: ; preds = %for.cond ret void terminate7: ; preds = %ehcleanup %10 = cleanuppad within %9 [] %11 = call i8* @llvm.wasm.get.exception(token %10) call void @__clang_call_terminate(i8* %11) #7 [ "funclet"(token %10) ] unreachable } ; We don't need to call placeBlockMarker after fixUnwindMismatches unless the ; destination is the appendix BB at the very end. This should not crash. define void @test16(i32* %p, i32 %a, i32 %b) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: br label %loop loop: ; preds = %try.cont, %entry invoke void @foo() to label %bb0 unwind label %catch.dispatch0 bb0: ; preds = %loop %cmp = icmp ne i32 %a, %b br i1 %cmp, label %bb1, label %last bb1: ; preds = %bb0 invoke void @bar() to label %try.cont unwind label %catch.dispatch1 catch.dispatch0: ; preds = %loop %0 = catchswitch within none [label %catch.start0] unwind to caller catch.start0: ; preds = %catch.dispatch0 %1 = catchpad within %0 [i8* null] %2 = call i8* @llvm.wasm.get.exception(token %1) %3 = call i32 @llvm.wasm.get.ehselector(token %1) catchret from %1 to label %try.cont catch.dispatch1: ; preds = %bb1 %4 = catchswitch within none [label %catch.start1] unwind to caller catch.start1: ; preds = %catch.dispatch1 %5 = catchpad within %4 [i8* null] %6 = call i8* @llvm.wasm.get.exception(token %5) %7 = call i32 @llvm.wasm.get.ehselector(token %5) catchret from %5 to label %try.cont try.cont: ; preds = %catch.start1, %catch.start0, %bb1 br label %loop last: ; preds = %bb0 ret void } ; Tests if CFGStackify's removeUnnecessaryInstrs() removes unnecessary branches ; correctly. ; CHECK-LABEL: test17 define void @test17(i32 %n) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: invoke void @foo() to label %for.body unwind label %catch.dispatch for.body: ; preds = %for.end, %entry %i = phi i32 [ %inc, %for.end ], [ 0, %entry ] invoke void @foo() to label %for.end unwind label %catch.dispatch ; Before going to CFGStackify, this BB will have a conditional branch followed ; by an unconditional branch. CFGStackify should remove only the unconditional ; one. for.end: ; preds = %for.body %inc = add nuw nsw i32 %i, 1 %exitcond = icmp eq i32 %inc, %n br i1 %exitcond, label %try.cont, label %for.body ; CHECK: br_if ; CHECK-NOT: br ; CHECK: end_loop ; CHECK: catch catch.dispatch: ; preds = %for.body, %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) #2 [ "funclet"(token %1) ] call void @__cxa_end_catch() [ "funclet"(token %1) ] catchret from %1 to label %try.cont try.cont: ; preds = %catch.start, %for.end ret void } ; Here an exception is semantically contained in a loop. 'ehcleanup' BB belongs ; to the exception, but does not belong to the loop (because it does not have a ; path back to the loop header), and is placed after the loop latch block ; 'invoke.cont' intentionally. This tests if 'end_loop' marker is placed ; correctly not right after 'invoke.cont' part but after 'ehcleanup' part, ; NOSORT-LABEL: test18 ; NOSORT: loop ; NOSORT: try ; NOSORT: end_try ; NOSORT: end_loop define void @test18(i32 %n) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: br label %while.cond while.cond: ; preds = %invoke.cont, %entry %n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %invoke.cont ] %tobool = icmp ne i32 %n.addr.0, 0 br i1 %tobool, label %while.body, label %while.end while.body: ; preds = %while.cond %dec = add nsw i32 %n.addr.0, -1 invoke void @foo() to label %while.end unwind label %catch.dispatch catch.dispatch: ; preds = %while.body %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 @__cxa_end_catch() [ "funclet"(token %1) ] to label %invoke.cont unwind label %ehcleanup invoke.cont: ; preds = %catch.start catchret from %1 to label %while.cond ehcleanup: ; preds = %catch.start %5 = cleanuppad within %1 [] %6 = call i8* @llvm.wasm.get.exception(token %5) call void @__clang_call_terminate(i8* %6) [ "funclet"(token %5) ] unreachable while.end: ; preds = %while.body, %while.cond ret void } ; When the function return type is non-void and 'end' instructions are at the ; very end of a function, CFGStackify's fixEndsAtEndOfFunction function fixes ; the corresponding block/loop/try's type to match the function's return type. ; But when a `try`'s type is fixed, we should also check `end` instructions ; before its corresponding `catch`, because both `try` and `catch` body should ; satisfy the return type requirements. ; NOSORT-LABEL: test19 ; NOSORT: try i32 ; NOSORT: loop i32 ; NOSORT: end_loop ; NOSORT: catch ; NOSORT: end_try ; NOSORT-NEXT: end_function define i32 @test19(i32 %n) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { entry: %t = alloca %class.Object, align 1 br label %for.cond for.cond: ; preds = %for.inc, %entry %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] %cmp = icmp slt i32 %i.0, %n br label %for.body for.body: ; preds = %for.cond %div = sdiv i32 %n, 2 %cmp1 = icmp eq i32 %i.0, %div br i1 %cmp1, label %if.then, label %for.inc if.then: ; preds = %for.body %call = invoke i32 @baz() to label %invoke.cont unwind label %ehcleanup invoke.cont: ; preds = %if.then %call2 = call %class.Object* @_ZN6ObjectD2Ev(%class.Object* %t) #4 ret i32 %call for.inc: ; preds = %for.body %inc = add nsw i32 %i.0, 1 br label %for.cond ehcleanup: ; preds = %if.then %0 = cleanuppad within none [] %call3 = call %class.Object* @_ZN6ObjectD2Ev(%class.Object* %t) #4 [ "funclet"(token %0) ] cleanupret from %0 unwind to caller } ; Check if the unwind destination mismatch stats are correct ; NOSORT-STAT: 17 wasm-cfg-stackify - Number of EH pad unwind mismatches found declare void @foo() declare void @bar() declare i32 @baz() declare i32 @qux(i32) declare void @quux(i32) declare void @fun(i32) ; Function Attrs: nounwind declare void @nothrow(i32) #0 declare i32 @nothrow_i32() #0 ; Function Attrs: nounwind declare %class.Object* @_ZN6ObjectD2Ev(%class.Object* returned) #0 @_ZTI7MyClass = external constant { i8*, i8* }, align 4 ; Function Attrs: nounwind declare %class.MyClass* @_ZN7MyClassD2Ev(%class.MyClass* returned) #0 ; Function Attrs: nounwind declare %class.MyClass* @_ZN7MyClassC2ERKS_(%class.MyClass* returned, %class.MyClass* dereferenceable(4)) #0 declare i32 @__gxx_wasm_personality_v0(...) declare i8* @llvm.wasm.get.exception(token) declare i32 @llvm.wasm.get.ehselector(token) declare void @llvm.wasm.rethrow.in.catch() declare i32 @llvm.eh.typeid.for(i8*) declare i8* @__cxa_begin_catch(i8*) declare void @__cxa_end_catch() declare i8* @__cxa_get_exception_ptr(i8*) declare void @__clang_call_terminate(i8*) declare void @_ZSt9terminatev() ; Function Attrs: nounwind declare void @llvm.memcpy.p0i8.p0i8.i32(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i32, i1 immarg) #0 ; Function Attrs: nounwind declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i1 immarg) #0 ; Function Attrs: nounwind declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1 immarg) #0 attributes #0 = { nounwind }