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llvm-project/llvm/test/CodeGen/WebAssembly/cfg-stackify-eh-legacy.ll
Heejin Ahn a8e1135baa
[WebAssembly] Add -wasm-use-legacy-eh option (#122158) 
This replaces the existing `-wasm-enable-exnref` with
`-wasm-use-legacy-eh` option, in an effort to make the new standardized
exnref proposal the 'default' state and the legacy proposal needs to be
separately enabled an option. But given that most users haven't switched
to the new proposal and major web browsers haven't turned it on by
default, this `-wasm-use-legacy-eh` is turned on by default, so nothing
will change for now for the functionality perspective.

This also removes the restriction that `-wasm-enable-exnref` be only
used with `-wasm-enable-eh` because this option is enabled by default.
This option does not have any effect when `-wasm-enable-eh` is not used.
2025-01-09 22:36:10 -08:00

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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 -wasm-use-legacy-eh -exception-model=wasm -mattr=+exception-handling,bulk-memory | 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 -wasm-use-legacy-eh -exception-model=wasm -mattr=+exception-handling,bulk-memory
; RUN: llc < %s -O0 -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -verify-machineinstrs -wasm-enable-eh -wasm-use-legacy-eh -exception-model=wasm -mattr=+exception-handling,-bulk-memory,-bulk-memory-opt | 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 -wasm-use-legacy-eh -exception-model=wasm -mattr=+exception-handling,-bulk-memory,-bulk-memory-opt -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 -wasm-use-legacy-eh -exception-model=wasm -mattr=+exception-handling,-bulk-memory,-bulk-memory-opt -wasm-disable-ehpad-sort | FileCheck %s --check-prefix=NOSORT-LOCALS
target triple = "wasm32-unknown-unknown"
@_ZTIi = external constant ptr
@_ZTId = external constant ptr
%class.Object = type { i8 }
%class.MyClass = type { i32 }
; Simple test case with two catch clauses
;
; void foo();
; void two_catches() {
; try {
; foo();
; } catch (int) {
; } catch (double) {
; }
; }
; CHECK-LABEL: two_catches:
; 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 @two_catches() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr @_ZTIi, ptr @_ZTId]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi)
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch2, label %catch.fallthrough
catch2: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %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(ptr @_ZTId)
%matches1 = icmp eq i32 %3, %6
br i1 %matches1, label %catch, label %rethrow
catch: ; preds = %catch.fallthrough
%7 = call ptr @__cxa_begin_catch(ptr %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 nested_catch() {
; try {
; foo();
; } catch (int) {
; try {
; foo();
; } catch (int) {
; foo();
; }
; }
; }
; CHECK-LABEL: nested_catch:
; 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 @nested_catch() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi)
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %2) [ "funclet"(token %1) ]
%6 = load i32, ptr %5, align 4
invoke void @foo() [ "funclet"(token %1) ]
to label %try.cont unwind label %catch.dispatch2
catch.dispatch2: ; preds = %catch
%7 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup9
catch.start3: ; preds = %catch.dispatch2
%8 = catchpad within %7 [ptr @_ZTIi]
%9 = call ptr @llvm.wasm.get.exception(token %8)
%10 = call i32 @llvm.wasm.get.ehselector(token %8)
%11 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi)
%matches4 = icmp eq i32 %10, %11
br i1 %matches4, label %catch6, label %rethrow5
catch6: ; preds = %catch.start3
%12 = call ptr @__cxa_begin_catch(ptr %9) [ "funclet"(token %8) ]
%13 = load i32, ptr %12, align 4
invoke void @foo() [ "funclet"(token %8) ]
to label %invoke.cont8 unwind label %ehcleanup
invoke.cont8: ; preds = %catch6
call void @__cxa_end_catch() [ "funclet"(token %8) ]
catchret from %8 to label %try.cont
rethrow5: ; preds = %catch.start3
invoke void @llvm.wasm.rethrow() [ "funclet"(token %8) ]
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
%14 = cleanuppad within %8 []
call void @__cxa_end_catch() [ "funclet"(token %14) ]
cleanupret from %14 unwind label %ehcleanup9
ehcleanup9: ; preds = %ehcleanup, %rethrow5, %catch.dispatch2
%15 = cleanuppad within %1 []
call void @__cxa_end_catch() [ "funclet"(token %15) ]
cleanupret from %15 unwind to caller
unreachable: ; preds = %rethrow5
unreachable
}
; Nested try-catches within a try
; void nested_try() {
; try {
; try {
; foo();
; } catch (...) {
; }
; } catch (...) {
; }
; }
; CHECK-LABEL: nested_try:
; CHECK: try
; CHECK: try
; CHECK: call foo
; CHECK: catch
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: end_try
; CHECK: catch
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: end_try
define void @nested_try() personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @foo()
to label %try.cont7 unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind label %catch.dispatch2
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %2) [ "funclet"(token %1) ]
invoke void @__cxa_end_catch() [ "funclet"(token %1) ]
to label %invoke.cont1 unwind label %catch.dispatch2
catch.dispatch2: ; preds = %catch.start, %catch.dispatch
%5 = catchswitch within none [label %catch.start3] unwind to caller
catch.start3: ; preds = %catch.dispatch2
%6 = catchpad within %5 [ptr null]
%7 = call ptr @llvm.wasm.get.exception(token %6)
%8 = call i32 @llvm.wasm.get.ehselector(token %6)
%9 = call ptr @__cxa_begin_catch(ptr %7) [ "funclet"(token %6) ]
call void @__cxa_end_catch() [ "funclet"(token %6) ]
catchret from %6 to label %try.cont7
try.cont7: ; preds = %entry, %invoke.cont1, %catch.start3
ret void
invoke.cont1: ; preds = %catch.start
catchret from %1 to label %try.cont7
}
; CHECK-LABEL: loop_within_catch:
; 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 @loop_within_catch() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %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: block_try_markers:
; 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 @block_try_markers() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @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-LABEL: loop_try_markers:
; CHECK: loop
; CHECK: try
; CHECK: call foo
; CHECK: catch
; CHECK: end_try
; CHECK: end_loop
define void @loop_try_markers(ptr %p) personality ptr @__gxx_wasm_personality_v0 {
entry:
store volatile i32 0, ptr %p
br label %loop
loop: ; preds = %try.cont, %entry
store volatile i32 1, ptr %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 [ptr null]
%2 = call ptr @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 the exception to the caller to fix
; this.
; NOSORT-LABEL: unwind_mismatches_0:
; 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 @unwind_mismatches_0() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @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 [ptr null]
%6 = call ptr @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 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: unwind_mismatches_1:
; 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 @unwind_mismatches_1() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @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 unwind_mismatches_0, 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: unwind_mismatches_2:
; 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 @unwind_mismatches_2() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @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 [ptr null]
%6 = call ptr @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 @unwind_mismatches_1. 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: unwind_mismatches_3:
; 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 @unwind_mismatches_3() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%3 = call ptr @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
}
; 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: unwind_mismatches_4:
; 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 @unwind_mismatches_4() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %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 [ptr null]
%7 = call ptr @llvm.wasm.get.exception(token %6)
%8 = call i32 @llvm.wasm.get.ehselector(token %6)
%9 = call ptr @__cxa_begin_catch(ptr %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
}
; This crashed when updating EHPadStack within fixCallUniwindMismatch had a bug.
; This should not crash and try-delegate has to be created around 'call @baz',
; because the initial TRY placement for 'call @quux' was done before 'call @baz'
; because 'call @baz''s return value is stackified.
; CHECK-LABEL: unwind_mismatches_5:
; CHECK: try
; --- try-delegate starts (call unwind mismatch)
; CHECK: try
; CHECK: call $[[RET:[0-9]+]]=, baz
; CHECK: delegate 1
; --- try-delegate ends (call unwind mismatch)
; CHECK: call quux, $[[RET]]
; CHECK: catch_all
; CHECK: end_try
define void @unwind_mismatches_5() personality ptr @__gxx_wasm_personality_v0 {
entry:
%call = call i32 @baz()
invoke void @quux(i32 %call)
to label %invoke.cont unwind label %ehcleanup
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
cleanupret from %0 unwind to caller
invoke.cont: ; preds = %entry
unreachable
}
; The structure is similar to unwind_mismatches_0, where the call to 'bar''s
; original unwind destination is catch.dispatch1 but after placing markers it
; unwinds to catch.dispatch0, which we fix. This additionally has a loop before
; the real unwind destination (catch.dispatch1).
; NOSORT-LABEL: unwind_mismatches_with_loop:
; NOSORT: try
; NOSORT: try
; NOSORT: try
; NOSORT: call foo
; NOSORT: try
; NOSORT: call bar
; NOSORT: delegate 3 # label/catch{{[0-9]+}}: down to catch[[C0:[0-9]+]]
; NOSORT: catch $drop=, __cpp_exception
; NOSORT: end_try
; NOSORT: delegate 2 # label/catch{{[0-9]+}}: to caller
; NOSORT: loop
; NOSORT: call foo
; NOSORT: end_loop
; NOSORT: catch $drop=, __cpp_exception # catch[[C0]]:
; NOSORT: return
; NOSORT: end_try
define void @unwind_mismatches_with_loop() personality ptr @__gxx_wasm_personality_v0 {
bb0:
invoke void @foo()
to label %bb1 unwind label %catch.dispatch0
bb1: ; preds = %bb0
invoke void @bar()
to label %bb2 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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
catchret from %1 to label %bb2
bb2:
invoke void @foo()
to label %bb3 unwind label %catch.dispatch1
bb3: ; preds = %bb14
br label %bb2
catch.dispatch1: ; preds = %bb1
%4 = catchswitch within none [label %catch.start1] unwind to caller
catch.start1: ; preds = %catch.dispatch1
%5 = catchpad within %4 [ptr null]
%6 = call ptr @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
}
; Tests the case when TEE stackifies a register in RegStackify but it gets
; unstackified in fixCallUnwindMismatches in CFGStackify.
; NOSORT-LOCALS-LABEL: unstackify_when_fixing_unwind_mismatch:
define void @unstackify_when_fixing_unwind_mismatch(i32 %x) personality ptr @__gxx_wasm_personality_v0 {
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, we end up unstackifying the first dest register. In that case,
; we convert that tee into a copy.
%addr = inttoptr i32 %t to ptr
%load = load i32, ptr %addr
%call = call i32 @baz()
%add = add i32 %load, %call
store i32 %add, ptr %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 [ptr null]
%2 = call ptr @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
}
; 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: cfg_sort_order:
; NOOPT: block
; NOOPT: try
; NOOPT: call foo
; NOOPT: catch
; NOOPT: end_try
; NOOPT: call foo
; NOOPT: end_block
; NOOPT: return
define void @cfg_sort_order(i32 %arg) personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %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: mem_intrinsics:
; 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 @mem_intrinsics(ptr %a, ptr %b) personality ptr @__gxx_wasm_personality_v0 {
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.p0.p0.i32(ptr %a, ptr %b, i32 100, i1 false)
call void @llvm.memmove.p0.p0.i32(ptr %a, ptr %b, i32 100, i1 false)
call void @llvm.memset.p0.i32(ptr %a, i8 0, i32 100, i1 false)
%call = call ptr @_ZN6ObjectD2Ev(ptr %o)
ret void
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
%call2 = call ptr @_ZN6ObjectD2Ev(ptr %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: try_marker_with_stackified_input:
; CHECK: try
; CHECK: call $push{{.*}}=, nothrow_i32
; CHECK: call fun, $pop{{.*}}
define void @try_marker_with_stackified_input() personality ptr @__gxx_wasm_personality_v0 {
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 @loop_exception_region() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr @_ZTI7MyClass]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTI7MyClass)
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_get_exception_ptr(ptr %2) [ "funclet"(token %1) ]
%call = call ptr @_ZN7MyClassC2ERKS_(ptr %e, ptr dereferenceable(4) %5) [ "funclet"(token %1) ]
%6 = call ptr @__cxa_begin_catch(ptr %2) [ "funclet"(token %1) ]
%7 = load i32, ptr %e, align 4
invoke void @quux(i32 %7) [ "funclet"(token %1) ]
to label %invoke.cont2 unwind label %ehcleanup
invoke.cont2: ; preds = %catch
%call3 = call ptr @_ZN7MyClassD2Ev(ptr %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
%8 = cleanuppad within %1 []
%call4 = call ptr @_ZN7MyClassD2Ev(ptr %e) [ "funclet"(token %8) ]
invoke void @__cxa_end_catch() [ "funclet"(token %8) ]
to label %invoke.cont6 unwind label %terminate7
invoke.cont6: ; preds = %ehcleanup
cleanupret from %8 unwind to caller
for.end: ; preds = %for.cond
ret void
terminate7: ; preds = %ehcleanup
%9 = cleanuppad within %8 []
call void @_ZSt9terminatev() [ "funclet"(token %9) ]
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: remove_unnecessary_instrs:
define void @remove_unnecessary_instrs(i32 %n) personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %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 remove_unnecessary_br() {
; 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: remove_unnecessary_br:
define void @remove_unnecessary_br() personality ptr @__gxx_wasm_personality_v0 {
; 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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %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 [ptr null]
%7 = call ptr @llvm.wasm.get.exception(token %6)
%8 = call i32 @llvm.wasm.get.ehselector(token %6)
%9 = call ptr @__cxa_begin_catch(ptr %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
invoke.cont2: ; preds = %catch.start
catchret from %1 to label %try.cont8
}
; 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: loop_contains_exception:
; NOSORT: loop
; NOSORT: try
; NOSORT: try
; NOSORT: end_try
; NOSORT: end_try
; NOSORT: end_loop
define void @loop_contains_exception(i32 %n) personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %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 []
call void @_ZSt9terminatev() [ "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_all`, because both `try` and `catch_all` body
; should satisfy the return type requirements.
; NOSORT-LABEL: fix_function_end_return_type_with_try_catch:
; NOSORT: try i32
; NOSORT: loop i32
; NOSORT: end_loop
; NOSORT: catch_all
; NOSORT: end_try
; NOSORT-NEXT: end_function
define i32 @fix_function_end_return_type_with_try_catch(i32 %n) personality ptr @__gxx_wasm_personality_v0 {
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 ptr @_ZN6ObjectD2Ev(ptr %t)
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 ptr @_ZN6ObjectD2Ev(ptr %t) [ "funclet"(token %0) ]
cleanupret from %0 unwind to caller
}
; This tests if invalidated branch destinations after fixing catch unwind
; mismatches are correctly remapped. For example, we have this code and suppose
; we need to wrap this try-catch-end in this code with a try-delegate to fix a
; catch unwind mismatch:
; - Before:
; block
; br (a)
; try
; catch
; end_try
; end_block
; <- (a)
;
; - After
; block
; br (a)
; try
; try
; catch
; end_try
; <- (a)
; delegate
; end_block
; <- (b)
; After adding a try-delegate, the 'br's destination BB, where (a) points,
; becomes invalid because it incorrectly branches into an inner scope. The
; destination should change to the BB where (b) points.
; NOSORT-LABEL: branch_remapping_after_fixing_unwind_mismatches_0:
; NOSORT: try
; NOSORT: br_if 0
define void @branch_remapping_after_fixing_unwind_mismatches_0(i1 %arg) personality ptr @__gxx_wasm_personality_v0 {
entry:
br i1 %arg, label %bb0, label %dest
bb0: ; preds = %entry
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
catchret from %1 to label %try.cont
dest: ; preds = %entry
ret void
catch.dispatch1: ; preds = %bb1
%4 = catchswitch within none [label %catch.start1] unwind to caller
catch.start1: ; preds = %catch.dispatch1
%5 = catchpad within %4 [ptr null]
%6 = call ptr @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
}
; The similar case with branch_remapping_after_fixing_unwind_mismatches_0, but
; multiple consecutive delegates are generated:
; - Before:
; block
; br (a)
; try
; catch
; end_try
; end_block
; <- (a)
;
; - After
; block
; br (a)
; try
; ...
; try
; try
; catch
; end_try
; <- (a)
; delegate
; delegate
; end_block
; <- (b) The br destination should be remapped to here
;
; The test was reduced by bugpoint and should not crash in CFGStackify.
define void @branch_remapping_after_fixing_unwind_mismatches_1() personality ptr @__gxx_wasm_personality_v0 {
entry:
br i1 undef, label %if.then, label %if.end12
if.then: ; preds = %entry
invoke void @__cxa_throw(ptr null, ptr null, ptr null) #1
to label %unreachable unwind label %catch.dispatch
catch.dispatch: ; preds = %if.then
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
catchret from %1 to label %catchret.dest
catchret.dest: ; preds = %catch.start
invoke void @foo()
to label %invoke.cont unwind label %catch.dispatch4
invoke.cont: ; preds = %catchret.dest
invoke void @__cxa_throw(ptr null, ptr null, ptr null) #1
to label %unreachable unwind label %catch.dispatch4
catch.dispatch4: ; preds = %invoke.cont, %catchret.dest
%4 = catchswitch within none [label %catch.start5] unwind to caller
catch.start5: ; preds = %catch.dispatch4
%5 = catchpad within %4 [ptr @_ZTIi]
%6 = call ptr @llvm.wasm.get.exception(token %5)
%7 = call i32 @llvm.wasm.get.ehselector(token %5)
unreachable
if.end12: ; preds = %entry
invoke void @foo()
to label %invoke.cont14 unwind label %catch.dispatch16
catch.dispatch16: ; preds = %if.end12
%8 = catchswitch within none [label %catch.start17] unwind label %ehcleanup
catch.start17: ; preds = %catch.dispatch16
%9 = catchpad within %8 [ptr @_ZTIi]
%10 = call ptr @llvm.wasm.get.exception(token %9)
%11 = call i32 @llvm.wasm.get.ehselector(token %9)
br i1 undef, label %catch20, label %rethrow19
catch20: ; preds = %catch.start17
catchret from %9 to label %catchret.dest22
catchret.dest22: ; preds = %catch20
br label %try.cont23
rethrow19: ; preds = %catch.start17
invoke void @llvm.wasm.rethrow() #1 [ "funclet"(token %9) ]
to label %unreachable unwind label %ehcleanup
try.cont23: ; preds = %invoke.cont14, %catchret.dest22
invoke void @foo()
to label %invoke.cont24 unwind label %ehcleanup
invoke.cont24: ; preds = %try.cont23
ret void
invoke.cont14: ; preds = %if.end12
br label %try.cont23
ehcleanup: ; preds = %try.cont23, %rethrow19, %catch.dispatch16
%12 = cleanuppad within none []
cleanupret from %12 unwind to caller
unreachable: ; preds = %rethrow19, %invoke.cont, %if.then
unreachable
}
; Regression test for WasmEHFuncInfo's reverse mapping bug. 'UnwindDestToSrc'
; should return a vector and not a single BB, which was incorrect.
; This was reduced by bugpoint and should not crash in CFGStackify.
define void @wasm_eh_func_info_regression_test() personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @foo()
to label %invoke.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind label %ehcleanup22
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
invoke void @__cxa_throw(ptr null, ptr null, ptr null) #1 [ "funclet"(token %1) ]
to label %unreachable unwind label %catch.dispatch2
catch.dispatch2: ; preds = %catch.start
%4 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup
catch.start3: ; preds = %catch.dispatch2
%5 = catchpad within %4 [ptr @_ZTIi]
%6 = call ptr @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.start3
invoke void @foo() [ "funclet"(token %1) ]
to label %invoke.cont8 unwind label %ehcleanup
invoke.cont8: ; preds = %try.cont
invoke void @__cxa_throw(ptr null, ptr null, ptr null) #1 [ "funclet"(token %1) ]
to label %unreachable unwind label %catch.dispatch11
catch.dispatch11: ; preds = %invoke.cont8
%8 = catchswitch within %1 [label %catch.start12] unwind label %ehcleanup
catch.start12: ; preds = %catch.dispatch11
%9 = catchpad within %8 [ptr @_ZTIi]
%10 = call ptr @llvm.wasm.get.exception(token %9)
%11 = call i32 @llvm.wasm.get.ehselector(token %9)
unreachable
invoke.cont: ; preds = %entry
unreachable
ehcleanup: ; preds = %catch.dispatch11, %try.cont, %catch.dispatch2
%12 = cleanuppad within %1 []
cleanupret from %12 unwind label %ehcleanup22
ehcleanup22: ; preds = %ehcleanup, %catch.dispatch
%13 = cleanuppad within none []
cleanupret from %13 unwind to caller
unreachable: ; preds = %invoke.cont8, %catch.start
unreachable
}
; void exception_grouping_0() {
; try {
; try {
; throw 0;
; } catch (int) {
; }
; } catch (int) {
; }
; }
;
; Regression test for a WebAssemblyException grouping bug. After catchswitches
; are removed, EH pad catch.start2 is dominated by catch.start, but because
; catch.start2 is the unwind destination of catch.start, it should not be
; included in catch.start's exception. Also, after we take catch.start2's
; exception out of catch.start's exception, we have to take out try.cont8 out of
; catch.start's exception, because it has a predecessor in catch.start2.
define void @exception_grouping_0() personality ptr @__gxx_wasm_personality_v0 {
entry:
%exception = call ptr @__cxa_allocate_exception(i32 4) #0
store i32 0, ptr %exception, align 16
invoke void @__cxa_throw(ptr %exception, ptr @_ZTIi, ptr null) #1
to label %unreachable unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind label %catch.dispatch1
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #0
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %2) #0 [ "funclet"(token %1) ]
%6 = load i32, ptr %5, align 4
call void @__cxa_end_catch() #0 [ "funclet"(token %1) ]
catchret from %1 to label %catchret.dest
catchret.dest: ; preds = %catch
br label %try.cont
rethrow: ; preds = %catch.start
invoke void @llvm.wasm.rethrow() #1 [ "funclet"(token %1) ]
to label %unreachable unwind label %catch.dispatch1
catch.dispatch1: ; preds = %rethrow, %catch.dispatch
%7 = catchswitch within none [label %catch.start2] unwind to caller
catch.start2: ; preds = %catch.dispatch1
%8 = catchpad within %7 [ptr @_ZTIi]
%9 = call ptr @llvm.wasm.get.exception(token %8)
%10 = call i32 @llvm.wasm.get.ehselector(token %8)
%11 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #0
%matches3 = icmp eq i32 %10, %11
br i1 %matches3, label %catch5, label %rethrow4
catch5: ; preds = %catch.start2
%12 = call ptr @__cxa_begin_catch(ptr %9) #0 [ "funclet"(token %8) ]
%13 = load i32, ptr %12, align 4
call void @__cxa_end_catch() #0 [ "funclet"(token %8) ]
catchret from %8 to label %catchret.dest7
catchret.dest7: ; preds = %catch5
br label %try.cont8
rethrow4: ; preds = %catch.start2
call void @llvm.wasm.rethrow() #1 [ "funclet"(token %8) ]
unreachable
try.cont8: ; preds = %try.cont, %catchret.dest7
ret void
try.cont: ; preds = %catchret.dest
br label %try.cont8
unreachable: ; preds = %rethrow, %entry
unreachable
}
; Test for WebAssemblyException grouping. This test is hand-modified to generate
; this structure:
; catch.start dominates catch.start4 and catch.start4 dominates catch.start12,
; so the after dominator-based grouping, we end up with:
; catch.start's exception > catch4.start's exception > catch12.start's exception
; (> here represents subexception relationship)
;
; But the unwind destination chain is catch.start -> catch.start4 ->
; catch.start12. So all these subexception relationship should be deconstructed.
; We have to make sure to take out catch.start4's exception out of catch.start's
; exception first, before taking out catch.start12's exception out of
; catch.start4's exception; otherwise we end up with an incorrect relationship
; of catch.start's exception > catch.start12's exception.
define void @exception_grouping_1() personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @foo()
to label %invoke.cont unwind label %catch.dispatch
invoke.cont: ; preds = %entry
invoke void @foo()
to label %invoke.cont1 unwind label %catch.dispatch
invoke.cont1: ; preds = %invoke.cont
invoke void @foo()
to label %try.cont18 unwind label %catch.dispatch
catch.dispatch11: ; preds = %rethrow6, %catch.dispatch3
%0 = catchswitch within none [label %catch.start12] unwind to caller
catch.start12: ; preds = %catch.dispatch11
%1 = catchpad within %0 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #0
%matches13 = icmp eq i32 %3, %4
br i1 %matches13, label %catch15, label %rethrow14
catch15: ; preds = %catch.start12
%5 = call ptr @__cxa_begin_catch(ptr %2) #0 [ "funclet"(token %1) ]
%6 = load i32, ptr %5, align 4
call void @__cxa_end_catch() #0 [ "funclet"(token %1) ]
catchret from %1 to label %try.cont18
rethrow14: ; preds = %catch.start12
call void @llvm.wasm.rethrow() #1 [ "funclet"(token %1) ]
unreachable
catch.dispatch3: ; preds = %rethrow, %catch.dispatch
%7 = catchswitch within none [label %catch.start4] unwind label %catch.dispatch11
catch.start4: ; preds = %catch.dispatch3
%8 = catchpad within %7 [ptr @_ZTIi]
%9 = call ptr @llvm.wasm.get.exception(token %8)
%10 = call i32 @llvm.wasm.get.ehselector(token %8)
%11 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #0
%matches5 = icmp eq i32 %10, %11
br i1 %matches5, label %catch7, label %rethrow6
catch7: ; preds = %catch.start4
%12 = call ptr @__cxa_begin_catch(ptr %9) #0 [ "funclet"(token %8) ]
%13 = load i32, ptr %12, align 4
call void @__cxa_end_catch() #0 [ "funclet"(token %8) ]
catchret from %8 to label %try.cont18
rethrow6: ; preds = %catch.start4
invoke void @llvm.wasm.rethrow() #1 [ "funclet"(token %8) ]
to label %unreachable unwind label %catch.dispatch11
catch.dispatch: ; preds = %invoke.cont1, %invoke.cont, %entry
%14 = catchswitch within none [label %catch.start] unwind label %catch.dispatch3
catch.start: ; preds = %catch.dispatch
%15 = catchpad within %14 [ptr @_ZTIi]
%16 = call ptr @llvm.wasm.get.exception(token %15)
%17 = call i32 @llvm.wasm.get.ehselector(token %15)
%18 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #0
%matches = icmp eq i32 %17, %18
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%19 = call ptr @__cxa_begin_catch(ptr %16) #0 [ "funclet"(token %15) ]
%20 = load i32, ptr %19, align 4
call void @__cxa_end_catch() #0 [ "funclet"(token %15) ]
catchret from %15 to label %try.cont18
rethrow: ; preds = %catch.start
invoke void @llvm.wasm.rethrow() #1 [ "funclet"(token %15) ]
to label %unreachable unwind label %catch.dispatch3
try.cont18: ; preds = %catch, %catch7, %catch15, %invoke.cont1
ret void
unreachable: ; preds = %rethrow, %rethrow6
unreachable
}
; void exception_grouping_2() {
; try {
; try {
; throw 0;
; } catch (int) { // (a)
; }
; } catch (int) { // (b)
; }
; try {
; foo();
; } catch (int) { // (c)
; }
; }
;
; Regression test for an ExceptionInfo grouping bug. Because the first (inner)
; try always throws, both EH pads (b) (catch.start2) and (c) (catch.start10) are
; dominated by EH pad (a) (catch.start), even though they are not semantically
; contained in (a)'s exception. Because (a)'s unwind destination is (b), (b)'s
; exception is taken out of (a)'s. But because (c) is reachable from (b), we
; should make sure to take out (c)'s exception out of (a)'s exception too.
define void @exception_grouping_2() personality ptr @__gxx_wasm_personality_v0 {
entry:
%exception = call ptr @__cxa_allocate_exception(i32 4) #1
store i32 0, ptr %exception, align 16
invoke void @__cxa_throw(ptr %exception, ptr @_ZTIi, ptr null) #3
to label %unreachable unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind label %catch.dispatch1
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #1
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %2) #1 [ "funclet"(token %1) ]
%6 = load i32, ptr %5, align 4
call void @__cxa_end_catch() #1 [ "funclet"(token %1) ]
catchret from %1 to label %try.cont8
rethrow: ; preds = %catch.start
invoke void @llvm.wasm.rethrow() #3 [ "funclet"(token %1) ]
to label %unreachable unwind label %catch.dispatch1
catch.dispatch1: ; preds = %rethrow, %catch.dispatch
%7 = catchswitch within none [label %catch.start2] unwind to caller
catch.start2: ; preds = %catch.dispatch1
%8 = catchpad within %7 [ptr @_ZTIi]
%9 = call ptr @llvm.wasm.get.exception(token %8)
%10 = call i32 @llvm.wasm.get.ehselector(token %8)
%11 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #1
%matches3 = icmp eq i32 %10, %11
br i1 %matches3, label %catch5, label %rethrow4
catch5: ; preds = %catch.start2
%12 = call ptr @__cxa_begin_catch(ptr %9) #1 [ "funclet"(token %8) ]
%13 = load i32, ptr %12, align 4
call void @__cxa_end_catch() #1 [ "funclet"(token %8) ]
catchret from %8 to label %try.cont8
rethrow4: ; preds = %catch.start2
call void @llvm.wasm.rethrow() #3 [ "funclet"(token %8) ]
unreachable
try.cont8: ; preds = %catch, %catch5
invoke void @foo()
to label %try.cont16 unwind label %catch.dispatch9
catch.dispatch9: ; preds = %try.cont8
%14 = catchswitch within none [label %catch.start10] unwind to caller
catch.start10: ; preds = %catch.dispatch9
%15 = catchpad within %14 [ptr @_ZTIi]
%16 = call ptr @llvm.wasm.get.exception(token %15)
%17 = call i32 @llvm.wasm.get.ehselector(token %15)
%18 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #1
%matches11 = icmp eq i32 %17, %18
br i1 %matches11, label %catch13, label %rethrow12
catch13: ; preds = %catch.start10
%19 = call ptr @__cxa_begin_catch(ptr %16) #1 [ "funclet"(token %15) ]
%20 = load i32, ptr %19, align 4
call void @__cxa_end_catch() #1 [ "funclet"(token %15) ]
catchret from %15 to label %try.cont16
rethrow12: ; preds = %catch.start10
call void @llvm.wasm.rethrow() #3 [ "funclet"(token %15) ]
unreachable
try.cont16: ; preds = %try.cont8, %catch13
ret void
unreachable: ; preds = %rethrow, %entry
unreachable
}
; Check if the unwind destination mismatch stats are correct
; NOSORT: 24 wasm-cfg-stackify - Number of call unwind mismatches found
; NOSORT: 5 wasm-cfg-stackify - Number of catch 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
; Function Attrs: nounwind
declare i32 @nothrow_i32() #0
; Function Attrs: nounwind
declare ptr @_ZN6ObjectD2Ev(ptr returned) #0
@_ZTI7MyClass = external constant { ptr, ptr }, align 4
; Function Attrs: nounwind
declare ptr @_ZN7MyClassD2Ev(ptr returned) #0
; Function Attrs: nounwind
declare ptr @_ZN7MyClassC2ERKS_(ptr returned, ptr dereferenceable(4)) #0
declare i32 @__gxx_wasm_personality_v0(...)
; Function Attrs: nounwind
declare ptr @llvm.wasm.get.exception(token) #0
; Function Attrs: nounwind
declare i32 @llvm.wasm.get.ehselector(token) #0
declare ptr @__cxa_allocate_exception(i32) #0
declare void @__cxa_throw(ptr, ptr, ptr)
; Function Attrs: noreturn
declare void @llvm.wasm.rethrow() #1
; Function Attrs: nounwind
declare i32 @llvm.eh.typeid.for(ptr) #0
declare ptr @__cxa_begin_catch(ptr)
declare void @__cxa_end_catch()
declare ptr @__cxa_get_exception_ptr(ptr)
declare void @_ZSt9terminatev()
; Function Attrs: nounwind
declare void @llvm.memcpy.p0.p0.i32(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i32, i1 immarg) #0
; Function Attrs: nounwind
declare void @llvm.memmove.p0.p0.i32(ptr nocapture, ptr nocapture readonly, i32, i1 immarg) #0
; Function Attrs: nounwind
declare void @llvm.memset.p0.i32(ptr nocapture writeonly, i8, i32, i1 immarg) #0
attributes #0 = { nounwind }
attributes #1 = { noreturn }
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