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cfg-stackify-eh.ll
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; 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 -wasm-enable-eh -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 -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling
; RUN: llc < %s -O0 -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -verify-machineinstrs -wasm-enable-eh -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 -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort -stats 2>&1 | 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 -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort | FileCheck %s --check-prefix=NOSORT-LOCALS
target triple = "wasm32-unknown-unknown"
@_ZTIi = external constant i8*
@_ZTId = external constant i8*
%class.Object = type { i8 }
%class.MyClass = type { i32 }
; 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 label[[L0:[0-9]+]]
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: br 1 # 1: down to label[[L1:[0-9]+]]
; CHECK: end_block # label[[L0]]:
; CHECK: block
; CHECK: br_if 0, {{.*}} # 0: down to label[[L2:[0-9]+]]
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: br 1 # 1: down to label[[L1]]
; CHECK: end_block # label[[L2]]:
; CHECK: rethrow 0 # to caller
; CHECK: end_try # label[[L1]]:
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() [ "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 label[[L0:[0-9+]]]
; CHECK: call $drop=, __cxa_begin_catch, $0
; CHECK: try
; CHECK: try
; CHECK: call foo
; CHECK: br 3 # 3: down to label[[L1:[0-9+]]]
; CHECK: catch
; CHECK: block
; CHECK: block
; CHECK: br_if 0, {{.*}} # 0: down to label[[L2:[0-9+]]]
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: try
; CHECK: call foo
; CHECK: br 2 # 2: down to label[[L3:[0-9+]]]
; CHECK: catch_all
; CHECK: call __cxa_end_catch
; CHECK: rethrow 0 # down to catch[[L4:[0-9+]]]
; CHECK: end_try
; CHECK: end_block # label[[L2]]:
; CHECK: rethrow 1 # down to catch[[L4]]
; CHECK: end_block # label[[L3]]:
; CHECK: call __cxa_end_catch
; CHECK: br 3 # 3: down to label[[L1]]
; CHECK: end_try
; CHECK: catch_all # catch[[L4]]:
; CHECK: call __cxa_end_catch
; CHECK: rethrow 0 # to caller
; CHECK: end_try
; CHECK: end_block # label[[L0]]:
; CHECK: rethrow 1 # to caller
; CHECK: end_block # label[[L1]]:
; 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() [ "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() [ "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 # label[[L0:[0-9]+]]:
; CHECK: block
; CHECK: block
; CHECK: br_if 0, {{.*}} # 0: down to label[[L1:[0-9]+]]
; CHECK: try
; CHECK: call foo
; CHECK: br 2 # 2: down to label[[L2:[0-9]+]]
; CHECK: catch
; CHECK: try
; CHECK: call __cxa_end_catch
; CHECK: catch_all
; CHECK: call _ZSt9terminatev
; CHECK: unreachable
; CHECK: end_try
; CHECK: rethrow 0 # to caller
; CHECK: end_try
; CHECK: end_block # label[[L1]]:
; CHECK: call __cxa_end_catch
; CHECK: br 2 # 2: down to label[[L3:[0-9]+]]
; CHECK: end_block # label[[L2]]:
; CHECK: br 0 # 0: up to label[[L0]]
; CHECK: end_loop
; CHECK: end_try # label[[L3]]:
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 []
call void @_ZSt9terminatev() [ "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 unwind mismatch
; 'call bar''s original unwind destination was 'C0', but after control flow
; linearization, its unwind destination incorrectly becomes 'C1'. We fix this by
; wrapping the call with a nested try-delegate that targets 'C0'.
; - Catch unwind mismatch
; If 'call foo' throws a foreign exception, it will not be caught by C1, and
; should be rethrown to the caller. But after control flow linearization, it
; will instead unwind to C0, an incorrect next EH pad. We wrap the whole
; try-catch with try-delegate that rethrows an exception to the caller to fix
; this.
; NOSORT-LABEL: test5
; NOSORT: try
; --- try-delegate starts (catch unwind mismatch)
; NOSORT try
; NOSORT: try
; NOSORT: call foo
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: call bar
; NOSORT: delegate 2 # label/catch{{[0-9]+}}: down to catch[[C0:[0-9]+]]
; --- try-delegate ends (call unwind mismatch)
; NOSORT: catch {{.*}} # catch[[C1:[0-9]+]]:
; NOSORT: end_try
; NOSORT: delegate 1 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (catch unwind mismatch)
; NOSORT: catch {{.*}} # catch[[C0]]:
; NOSORT: end_try
; 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
}
; 'call bar' and 'call baz''s original unwind destination was the caller, but
; after control flow linearization, their unwind destination incorrectly becomes
; 'C0'. We fix this by wrapping the calls with a nested try-delegate that
; rethrows exceptions 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
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: call bar
; NOSORT: call $[[RET:[0-9]+]]=, baz
; NOSORT-NOT: call $push{{.*}}=, baz
; NOSORT: delegate 1 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (call unwind mismatch)
; NOSORT: call nothrow, $[[RET]]
; NOSORT: return
; NOSORT: catch {{.*}} # catch[[C0:[0-9]+]]:
; NOSORT: return
; NOSORT: end_try
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
}
; The same as test5, but we have one more call 'call @foo' in bb1 which unwinds
; to the caller. IN this case bb1 has two call unwind mismatches: 'call @foo'
; unwinds to the caller and 'call @bar' unwinds to catch C0.
; NOSORT-LABEL: test7
; NOSORT: try
; --- try-delegate starts (catch unwind mismatch)
; NOSORT try
; NOSORT: try
; NOSORT: call foo
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: call foo
; NOSORT: delegate 3 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (call unwind mismatch)
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: call bar
; NOSORT: delegate 2 # label/catch{{[0-9]+}}: down to catch[[C0:[0-9]+]]
; --- try-delegate ends (call unwind mismatch)
; NOSORT: catch {{.*}} # catch[[C1:[0-9]+]]:
; NOSORT: end_try
; NOSORT: delegate 1 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (catch unwind mismatch)
; NOSORT: catch {{.*}} # catch[[C0]]:
; NOSORT: end_try
; NOSORT: return
define void @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
call void @foo()
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
}
; Similar situation as @test6. Here 'call @qux''s original unwind destination
; was the caller, but after control flow linearization, their unwind destination
; incorrectly becomes 'C0' within the function. We fix this by wrapping the call
; with a nested try-delegate that rethrows 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: test8
; NOSORT: try i32
; NOSORT: call foo
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: i32.const $push{{[0-9]+}}=, 5
; NOSORT: call ${{[0-9]+}}=, qux
; NOSORT: delegate 1 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (call unwind mismatch)
; NOSORT: return
; NOSORT: catch {{.*}} # catch[[C0:[0-9]+]]:
; NOSORT: return
; NOSORT: end_try
define i32 @test8() 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 fixCallUnwindMismatches in CFGStackify.
; NOSORT-LOCALS-LABEL: test9
define void @test9(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-delegate in fixCallUnwindMismatches 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
}
; We have two call unwind 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.
; We also have a catch unwind mismatch: If an exception is not caught by the
; first catch because it is a non-C++ exception, it shouldn't unwind to the next
; catch, but it should unwind to the caller.
; NOSORT-LABEL: test10
; NOSORT: try
; --- try-delegate starts (catch unwind mismatch)
; NOSORT: try
; NOSORT: try
; NOSORT: call foo
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: call bar
; NOSORT: delegate 2 # label/catch{{[0-9]+}}: down to catch[[C0:[0-9]+]]
; --- try-delegate ends (call unwind mismatch)
; NOSORT: catch
; NOSORT: call {{.*}} __cxa_begin_catch
; --- try-delegate starts (call unwind mismatch)
; NOSORT: try
; NOSORT: call __cxa_end_catch
; NOSORT: delegate 3 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (call unwind mismatch)
; NOSORT: end_try
; NOSORT: delegate 1 # label/catch{{[0-9]+}}: to caller
; --- try-delegate ends (catch unwind mismatch)
; NOSORT: catch {{.*}} # catch[[C0]]:
; NOSORT: call {{.*}} __cxa_begin_catch
; NOSORT: call __cxa_end_catch
; NOSORT: end_try
; NOSORT: return
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-LABEL: test11
; 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
}
; 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_all
; NOSORT: rethrow 0
; 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)
ret void
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
%call2 = call %class.Object* @_ZN6ObjectD2Ev(%class.Object* %o) [ "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 []
call void @_ZSt9terminatev() [ "funclet"(token %0) ]
unreachable
}
; 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*))
%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) [ "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) [ "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) [ "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() [ "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) [ "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 []
call void @_ZSt9terminatev() [ "funclet"(token %10) ]
unreachable
}
; Tests if CFGStackify's removeUnnecessaryInstrs() removes unnecessary branches
; correctly. The code is in the form below, where 'br' is unnecessary because
; after running the 'try' body the control flow will fall through to bb2 anyway.
; bb0:
; try
; ...
; br bb2 <- Not necessary
; bb1 (ehpad):
; catch
; ...
; bb2: <- Continuation BB
; end
; CHECK-LABEL: test15
define void @test15(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) [ "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
}
; void foo();
; void test16() {
; try {
; foo();
; try {
; foo();
; } catch (...) {
; }
; } catch (...) {
; }
; }
;
; This tests whether the 'br' can be removed in code in the form as follows.
; Here 'br' is inside an inner try, whose 'end' is in another EH pad. In this
; case, after running an inner try body, the control flow should fall through to
; bb3, so the 'br' in the code is unnecessary.
; bb0:
; try
; try
; ...
; br bb3 <- Not necessary
; bb1:
; catch
; bb2:
; end_try
; catch
; ...
; bb3: <- Continuation BB
; end
;
; CHECK-LABEL: test16
define void @test16() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK: call foo
entry:
invoke void @foo()
to label %invoke.cont unwind label %catch.dispatch3
; CHECK: call foo
; CHECK-NOT: br
invoke.cont: ; preds = %entry
invoke void @foo()
to label %try.cont8 unwind label %catch.dispatch
catch.dispatch: ; preds = %invoke.cont
%0 = catchswitch within none [label %catch.start] unwind label %catch.dispatch3
; CHECK: catch
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.cont2 unwind label %catch.dispatch3
catch.dispatch3: ; preds = %catch.start, %catch.dispatch, %entry
%5 = catchswitch within none [label %catch.start4] unwind to caller
catch.start4: ; preds = %catch.dispatch3
%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.cont8
try.cont8: ; preds = %invoke.cont2, %catch.start4, %invoke.cont
ret void