caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
dad55c22182e267c5baaeec9754039081b052dba
clang-p2996/llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.ll
Heejin Ahn c93b955939 [WebAssembly] Remove more unnecessary brs in CFGStackify 
After placing markers, we removed some unnecessary branches, but it only
handled the simplest case. This makes more unnecessary branches to be
removed.

Reviewed By: dschuff, tlively

Differential Revision: https://reviews.llvm.org/D94047
2021-01-12 01:18:10 -08:00

1197 lines
48 KiB
LLVM
Raw Blame History

; REQUIRES: asserts
; TODO Reenable disabled lines after updating the backend to the new spec
; 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
; R UN: 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
; R UN: 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
; R UN: 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*
%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
; CHECK: try
; CHECK: call foo
; CHECK: br 2 # 2: down to label[[L1:[0-9]+]]
; CHECK: catch
; CHECK: try
; 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
; CHECK: call __cxa_end_catch
; CHECK: rethrow 0 # down to catch[[C0:[0-9]+]]
; CHECK: end_try
; CHECK: end_block # label[[L2]]:
; CHECK: rethrow 0 # down to catch[[C0]]
; CHECK: catch_all # catch[[C0]]:
; CHECK: call __cxa_end_catch
; CHECK: rethrow 0 # to caller
; CHECK: end_try # label[[L3]]:
; CHECK: call __cxa_end_catch
; CHECK: br 2 # 2: down to label[[L1]]
; CHECK: end_try
; CHECK: end_block # label[[L0]]:
; CHECK: rethrow 0 # 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
; CHECK: call __clang_call_terminate
; 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 []
%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 'C1', but after control flow
; linearization, its unwind destination incorrectly becomes 'C0'. We fix this by
; wrapping the call with a nested try/catch/end_try and branching to the right
; destination (L0).
; 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 label[[L0:[0-9]+]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: br 2 # 2: down to label[[L1:[0-9]+]]
; NOSORT: catch $drop= # catch[[C0:[0-9]+]]:
; NOSORT: br 2 # 2: down to label[[L1]]
; NOSORT: end_try
; NOSORT: catch $drop= # catch[[C1:[0-9]+]]:
; NOSORT: end_try # label[[L0]]:
; NOSORT: end_block # label[[L1]]:
; 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 'C0'. We fix
; this by wrapping the call with a nested try/catch/end_try and branching to the
; right destination (L0), 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 label[[L0:[0-9]+]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: return
; NOSORT: catch $drop= # catch[[C0:[0-9]+]]:
; NOSORT: return
; NOSORT: end_try # label[[L0]]:
; 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 'C0' 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 label[[L0:[0-9]+]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: return
; NOSORT: catch $drop= # catch[[C0:[0-9]+]]:
; NOSORT: return
; NOSORT: end_try # label[[L0]]:
; 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 'C0' after linearizing the CFG.
; NOSORT-LABEL: test9
; NOSORT: block
; NOSORT-NOT: loop i32
; NOSORT: loop # label[[L0:[0-9]+]]:
; 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 label[[L1:[0-9]+]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: return {{.*}}
; NOSORT: catch $drop= # catch[[C0:[0-9]+]]:
; NOSORT: br 1 # 1: up to label[[L0]]
; NOSORT: end_try # label[[L1]]:
; 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 label[[L0:[0-9]+]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: br 2 # 2: down to label[[L1:[0-9]+]]
; NOSORT: catch {{.*}}
; NOSORT: block i32
; NOSORT: br_on_exn 0, {{.*}} # 0: down to label[[L2:[0-9]+]]
; --- Nested try/catch/end_try starts
; NOSORT: try
; NOSORT: rethrow 0 # down to catch[[C0:[0-9]+]]
; NOSORT: catch $[[REG1:[0-9]+]]= # catch[[C0]]:
; NOSORT: br 5 # 5: down to label[[L3:[0-9]+]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: end_block # label[[L2]]:
; 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 label[[L3]]
; NOSORT: end_try
; --- Nested try/catch/end_try ends
; NOSORT: br 2 # 2: down to label[[L1]]
; NOSORT: end_try
; NOSORT: catch $[[REG0]]=
; NOSORT: end_try # label[[L0]]:
; NOSORT: call $drop=, __cxa_begin_catch
; NOSORT: call __cxa_end_catch
; NOSORT: end_block # label[[L1]]:
; NOSORT: return
; NOSORT: end_block # label[[L3]]:
; 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
}
; 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
}
; 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() #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. 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: 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
}
; void foo();
; void test18() {
; 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: test18
define void @test18() 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) #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) #2 [ "funclet"(token %6) ]
call void @__cxa_end_catch() [ "funclet"(token %6) ]
catchret from %6 to label %try.cont8
try.cont8: ; preds = %invoke.cont, %invoke.cont2, %catch.start4
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: test19
; NOSORT: loop
; NOSORT: try
; NOSORT: end_try
; NOSORT: end_loop
define void @test19(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: test20
; NOSORT: try i32
; NOSORT: loop i32
; NOSORT: end_loop
; NOSORT: catch
; NOSORT: end_try
; NOSORT-NEXT: end_function
define i32 @test20(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()
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 }
Reference in New Issue View Git Blame Copy Permalink