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clang-p2996/llvm/test/CodeGen/WebAssembly/lower-em-exceptions.ll
Thomas Lively 89fe083c19 [WebAssembly] Check features before making SjLj vars thread-local 
1c5a3c4d38 updated the variables inserted by Emscripten SjLj lowering to be
thread-local, depending on the CoalesceFeaturesAndStripAtomics pass to downgrade
them to normal globals if the target features did not support TLS. However, this
had the unintended side effect of preventing all non-TLS-supporting objects from
being linked into modules with shared memory, because stripping TLS marks an
object as thread-unsafe. This patch fixes the problem by only making the SjLj
lowering variables thread-local if the target machine supports TLS so that it
never introduces new usage of TLS that will be stripped. Since SjLj lowering
works on Modules instead of Functions, this required that the
WebAssemblyTargetMachine have its feature string updated to reflect the
coalesced features collected from all the functions so that a
WebAssemblySubtarget can be created without using any particular function.

Differential Revision: https://reviews.llvm.org/D88323
2020-09-25 11:45:16 -07:00

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; RUN: opt < %s -wasm-lower-em-ehsjlj -S | FileCheck %s --check-prefixes=CHECK,NO-TLS
; RUN: opt < %s -wasm-lower-em-ehsjlj -S --mattr=+atomics,+bulk-memory | FileCheck %s --check-prefixes=CHECK,TLS
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
@_ZTIi = external constant i8*
@_ZTIc = external constant i8*
; NO-TLS-DAG: __THREW__ = external global i32
; NO-TLS-DAG: __threwValue = external global i32
; TLS-DAG: __THREW__ = external thread_local(localexec) global i32
; TLS-DAG: __threwValue = external thread_local(localexec) global i32
; Test invoke instruction with clauses (try-catch block)
define void @clause() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @clause(
entry:
invoke void @foo(i32 3)
to label %invoke.cont unwind label %lpad
; CHECK: entry:
; CHECK-NEXT: store i32 0, i32* @__THREW__
; CHECK-NEXT: call cc{{.*}} void @__invoke_void_i32(void (i32)* @foo, i32 3)
; CHECK-NEXT: %[[__THREW__VAL:.*]] = load i32, i32* @__THREW__
; CHECK-NEXT: store i32 0, i32* @__THREW__
; CHECK-NEXT: %cmp = icmp eq i32 %[[__THREW__VAL]], 1
; CHECK-NEXT: br i1 %cmp, label %lpad, label %invoke.cont
invoke.cont: ; preds = %entry
br label %try.cont
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 }
catch i8* bitcast (i8** @_ZTIi to i8*)
catch i8* null
%1 = extractvalue { i8*, i32 } %0, 0
%2 = extractvalue { i8*, i32 } %0, 1
br label %catch.dispatch
; CHECK: lpad:
; CHECK-NEXT: %[[FMC:.*]] = call i8* @__cxa_find_matching_catch_4(i8* bitcast (i8** @_ZTIi to i8*), i8* null)
; CHECK-NEXT: %[[IVI1:.*]] = insertvalue { i8*, i32 } undef, i8* %[[FMC]], 0
; CHECK-NEXT: %[[TEMPRET0_VAL:.*]] = call i32 @getTempRet0()
; CHECK-NEXT: %[[IVI2:.*]] = insertvalue { i8*, i32 } %[[IVI1]], i32 %[[TEMPRET0_VAL]], 1
; CHECK-NEXT: extractvalue { i8*, i32 } %[[IVI2]], 0
; CHECK-NEXT: %[[CDR:.*]] = extractvalue { i8*, i32 } %[[IVI2]], 1
catch.dispatch: ; preds = %lpad
%3 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %2, %3
br i1 %matches, label %catch1, label %catch
; CHECK: catch.dispatch:
; CHECK-NEXT: %[[TYPEID:.*]] = call i32 @llvm_eh_typeid_for(i8* bitcast (i8** @_ZTIi to i8*))
; CHECK-NEXT: %matches = icmp eq i32 %[[CDR]], %[[TYPEID]]
catch1: ; preds = %catch.dispatch
%4 = call i8* @__cxa_begin_catch(i8* %1)
%5 = bitcast i8* %4 to i32*
%6 = load i32, i32* %5, align 4
call void @__cxa_end_catch()
br label %try.cont
try.cont: ; preds = %catch, %catch1, %invoke.cont
ret void
catch: ; preds = %catch.dispatch
%7 = call i8* @__cxa_begin_catch(i8* %1)
call void @__cxa_end_catch()
br label %try.cont
}
; Test invoke instruction with filters (functions with throw(...) declaration)
define void @filter() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @filter(
entry:
invoke void @foo(i32 3)
to label %invoke.cont unwind label %lpad
; CHECK: entry:
; CHECK-NEXT: store i32 0, i32* @__THREW__
; CHECK-NEXT: call cc{{.*}} void @__invoke_void_i32(void (i32)* @foo, i32 3)
; CHECK-NEXT: %[[__THREW__VAL:.*]] = load i32, i32* @__THREW__
; CHECK-NEXT: store i32 0, i32* @__THREW__
; CHECK-NEXT: %cmp = icmp eq i32 %[[__THREW__VAL]], 1
; CHECK-NEXT: br i1 %cmp, label %lpad, label %invoke.cont
invoke.cont: ; preds = %entry
ret void
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 }
filter [2 x i8*] [i8* bitcast (i8** @_ZTIi to i8*), i8* bitcast (i8** @_ZTIc to i8*)]
%1 = extractvalue { i8*, i32 } %0, 0
%2 = extractvalue { i8*, i32 } %0, 1
br label %filter.dispatch
; CHECK: lpad:
; CHECK-NEXT: %[[FMC:.*]] = call i8* @__cxa_find_matching_catch_4(i8* bitcast (i8** @_ZTIi to i8*), i8* bitcast (i8** @_ZTIc to i8*))
; CHECK-NEXT: %[[IVI1:.*]] = insertvalue { i8*, i32 } undef, i8* %[[FMC]], 0
; CHECK-NEXT: %[[TEMPRET0_VAL:.*]] = call i32 @getTempRet0()
; CHECK-NEXT: %[[IVI2:.*]] = insertvalue { i8*, i32 } %[[IVI1]], i32 %[[TEMPRET0_VAL]], 1
; CHECK-NEXT: extractvalue { i8*, i32 } %[[IVI2]], 0
; CHECK-NEXT: extractvalue { i8*, i32 } %[[IVI2]], 1
filter.dispatch: ; preds = %lpad
%ehspec.fails = icmp slt i32 %2, 0
br i1 %ehspec.fails, label %ehspec.unexpected, label %eh.resume
ehspec.unexpected: ; preds = %filter.dispatch
call void @__cxa_call_unexpected(i8* %1) #4
unreachable
eh.resume: ; preds = %filter.dispatch
%lpad.val = insertvalue { i8*, i32 } undef, i8* %1, 0
%lpad.val3 = insertvalue { i8*, i32 } %lpad.val, i32 %2, 1
resume { i8*, i32 } %lpad.val3
; CHECK: eh.resume:
; CHECK-NEXT: insertvalue
; CHECK-NEXT: %[[LPAD_VAL:.*]] = insertvalue
; CHECK-NEXT: %[[LOW:.*]] = extractvalue { i8*, i32 } %[[LPAD_VAL]], 0
; CHECK-NEXT: call void @__resumeException(i8* %[[LOW]])
; CHECK-NEXT: unreachable
}
; Test if argument attributes indices in newly created call instructions are correct
define void @arg_attributes() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @arg_attributes(
entry:
%0 = invoke noalias i8* @bar(i8 signext 1, i8 zeroext 2)
to label %invoke.cont unwind label %lpad
; CHECK: entry:
; CHECK-NEXT: store i32 0, i32* @__THREW__
; CHECK-NEXT: %0 = call cc{{.*}} noalias i8* @"__invoke_i8*_i8_i8"(i8* (i8, i8)* @bar, i8 signext 1, i8 zeroext 2)
invoke.cont: ; preds = %entry
br label %try.cont
lpad: ; preds = %entry
%1 = landingpad { i8*, i32 }
catch i8* bitcast (i8** @_ZTIi to i8*)
catch i8* null
%2 = extractvalue { i8*, i32 } %1, 0
%3 = extractvalue { i8*, i32 } %1, 1
br label %catch.dispatch
catch.dispatch: ; preds = %lpad
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch1, label %catch
catch1: ; preds = %catch.dispatch
%5 = call i8* @__cxa_begin_catch(i8* %2)
%6 = bitcast i8* %5 to i32*
%7 = load i32, i32* %6, align 4
call void @__cxa_end_catch()
br label %try.cont
try.cont: ; preds = %catch, %catch1, %invoke.cont
ret void
catch: ; preds = %catch.dispatch
%8 = call i8* @__cxa_begin_catch(i8* %2)
call void @__cxa_end_catch()
br label %try.cont
}
declare void @foo(i32)
declare i8* @bar(i8, i8)
declare i32 @__gxx_personality_v0(...)
declare i32 @llvm.eh.typeid.for(i8*)
declare i8* @__cxa_begin_catch(i8*)
declare void @__cxa_end_catch()
declare void @__cxa_call_unexpected(i8*)
; JS glue functions and invoke wrappers declaration
; CHECK-DAG: declare i32 @getTempRet0()
; CHECK-DAG: declare void @setTempRet0(i32)
; CHECK-DAG: declare void @__resumeException(i8*)
; CHECK-DAG: declare void @__invoke_void_i32(void (i32)*, i32)
; CHECK-DAG: declare i8* @__cxa_find_matching_catch_4(i8*, i8*)
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