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llvm/test/CodeGen/WebAssembly/exception.ll
Wouter van Oortmerssen a26aa42625 [WebAssembly] Added default stack-only instruction mode for MC. 
Summary:
Made it convert from register to stack based instructions, and removed the registers.
Fixes to related code that was expecting register based instructions.
Added the correct testing flag to all tests, depending on what the
format they were expecting so far.
Translated one test to stack format as example: reg-stackify-stack.ll

tested:
llvm-lit -v `find test -name WebAssembly`
unittests/MC/*

Reviewers: dschuff, sunfish

Subscribers: sbc100, jgravelle-google, eraman, aheejin, llvm-commits, jfb

Differential Revision: https://reviews.llvm.org/D51241

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340750 91177308-0d34-0410-b5e6-96231b3b80d8
2018-08-27 15:45:51 +00:00

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; RUN: not llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-keep-registers -exception-model=wasm
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-keep-registers -exception-model=wasm -mattr=+exception-handling | FileCheck -allow-deprecated-dag-overlap %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
%struct.Cleanup = type { i8 }
@_ZTIi = external constant i8*
declare void @llvm.wasm.throw(i32, i8*)
; CHECK-LABEL: test_throw:
; CHECK-NEXT: i32.const $push0=, 0
; CHECK-NEXT: throw 0, $pop0
define void @test_throw() {
call void @llvm.wasm.throw(i32 0, i8* null)
ret void
}
; CHECK-LABEL: test_catch_rethrow:
; CHECK: get_global $push{{.+}}=, __stack_pointer@GLOBAL
; CHECK: try
; CHECK: call foo@FUNCTION
; CHECK: i32.catch $push{{.+}}=, 0
; CHECK: set_global __stack_pointer@GLOBAL
; CHECK-DAG: i32.store __wasm_lpad_context
; CHECK-DAG: i32.store __wasm_lpad_context+4
; CHECK: i32.call $push{{.+}}=, _Unwind_CallPersonality@FUNCTION
; CHECK: i32.call $push{{.+}}=, __cxa_begin_catch@FUNCTION
; CHECK: call __cxa_end_catch@FUNCTION
; CHECK: call __cxa_rethrow@FUNCTION
; CHECK-NEXT: rethrow
; CHECK: end_try
define void @test_catch_rethrow() 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*)]
%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) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
rethrow: ; preds = %catch.start
call void @__cxa_rethrow() [ "funclet"(token %1) ]
unreachable
try.cont: ; preds = %entry, %catch
ret void
}
; CHECK-LABEL: test_cleanup:
; CHECK: try
; CHECK: call foo@FUNCTION
; CHECK: catch_all
; CHECK: set_global __stack_pointer@GLOBAL
; CHECK: i32.call $push{{.+}}=, _ZN7CleanupD1Ev@FUNCTION
; CHECK: rethrow
; CHECK: end_try
define void @test_cleanup() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
entry:
%c = alloca %struct.Cleanup, align 1
invoke void @foo()
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%call = call %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c)
ret void
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
%call1 = call %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c) [ "funclet"(token %0) ]
cleanupret from %0 unwind to caller
}
; - Tests multple terminate pads are merged into one
; - Tests a catch_all terminate pad is created after a catch terminate pad
; CHECK-LABEL: test_terminatepad
; CHECK: i32.catch
; CHECK: call __clang_call_terminate@FUNCTION
; CHECK: unreachable
; CHECK: catch_all
; CHECK: call _ZSt9terminatev@FUNCTION
; CHECK-NOT: call __clang_call_terminate@FUNCTION
define hidden i32 @test_terminatepad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
entry:
%c = alloca %struct.Cleanup, align 1
%c1 = alloca %struct.Cleanup, align 1
invoke void @foo()
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%call = invoke %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c1)
to label %try.cont unwind label %catch.dispatch
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
%call4 = invoke %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c1) [ "funclet"(token %0) ]
to label %invoke.cont3 unwind label %terminate
invoke.cont3: ; preds = %ehcleanup
cleanupret from %0 unwind label %catch.dispatch
catch.dispatch: ; preds = %invoke.cont3, %invoke.cont
%1 = catchswitch within none [label %catch.start] unwind label %ehcleanup7
catch.start: ; preds = %catch.dispatch
%2 = catchpad within %1 [i8* null]
%3 = call i8* @llvm.wasm.get.exception(token %2)
%4 = call i32 @llvm.wasm.get.ehselector(token %2)
%5 = call i8* @__cxa_begin_catch(i8* %3) [ "funclet"(token %2) ]
invoke void @__cxa_end_catch() [ "funclet"(token %2) ]
to label %invoke.cont5 unwind label %ehcleanup7
invoke.cont5: ; preds = %catch.start
catchret from %2 to label %try.cont
try.cont: ; preds = %invoke.cont5, %invoke.cont
%call6 = call %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c)
ret i32 0
ehcleanup7: ; preds = %catch.start, %catch.dispatch
%6 = cleanuppad within none []
%call9 = invoke %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %c) [ "funclet"(token %6) ]
to label %invoke.cont8 unwind label %terminate10
invoke.cont8: ; preds = %ehcleanup7
cleanupret from %6 unwind to caller
terminate: ; preds = %ehcleanup
%7 = cleanuppad within %0 []
%8 = call i8* @llvm.wasm.get.exception(token %7)
call void @__clang_call_terminate(i8* %8) [ "funclet"(token %7) ]
unreachable
terminate10: ; preds = %ehcleanup7
%9 = cleanuppad within %6 []
%10 = call i8* @llvm.wasm.get.exception(token %9)
call void @__clang_call_terminate(i8* %10) [ "funclet"(token %9) ]
unreachable
}
; Tests prologues and epilogues are not generated within EH scopes.
; They should not be treated as funclets; BBs starting with a catch instruction
; should not have a prologue, and BBs ending with a catchret/cleanupret should
; not have an epilogue. This is separate from __stack_pointer restoring
; instructions after a catch instruction.
; CHECK-LABEL: test_no_prolog_epilog_in_ehpad
; CHECK: try
; CHECK: call foo@FUNCTION
; CHECK: i32.catch
; CHECK-NOT: get_global $push{{.+}}=, __stack_pointer@GLOBAL
; CHECK: set_global __stack_pointer@GLOBAL
; CHECK: try
; CHECK: call foo@FUNCTION
; CHECK: catch_all
; CHECK-NOT: get_global $push{{.+}}=, __stack_pointer@GLOBAL
; CHECK: set_global __stack_pointer@GLOBAL
; CHECK: call __cxa_end_catch@FUNCTION
; CHECK-NOT: set_global __stack_pointer@GLOBAL, $pop{{.+}}
; CHECK: end_try
; CHECK-NOT: set_global __stack_pointer@GLOBAL, $pop{{.+}}
; CHECK: end_try
define void @test_no_prolog_epilog_in_ehpad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
entry:
%stack_var = alloca i32, align 4
call void @bar(i32* %stack_var)
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*)]
%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 float*
%7 = load float, float* %6, align 4
invoke void @foo() [ "funclet"(token %1) ]
to label %invoke.cont1 unwind label %ehcleanup
invoke.cont1: ; preds = %catch
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
rethrow: ; preds = %catch.start
call void @__cxa_rethrow() [ "funclet"(token %1) ]
unreachable
try.cont: ; preds = %entry, %invoke.cont1
ret void
ehcleanup: ; preds = %catch
%8 = cleanuppad within %1 []
call void @__cxa_end_catch() [ "funclet"(token %8) ]
cleanupret from %8 unwind to caller
}
; When a function does not have stack-allocated objects, it does not need to
; store SP back to __stack_pointer global at the epilog.
; CHECK-LABEL: no_sp_writeback
; CHECK: try
; CHECK: call foo@FUNCTION
; CHECK: end_try
; CHECK-NOT: set_global __stack_pointer@GLOBAL
; CHECK: return
define void @no_sp_writeback() 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) #2 [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
try.cont: ; preds = %entry, %catch.start
ret void
}
declare void @foo()
declare void @bar(i32*)
declare i32 @__gxx_wasm_personality_v0(...)
declare i8* @llvm.wasm.get.exception(token)
declare i32 @llvm.wasm.get.ehselector(token)
declare i32 @llvm.eh.typeid.for(i8*)
declare i8* @__cxa_begin_catch(i8*)
declare void @__cxa_end_catch()
declare void @__cxa_rethrow()
declare void @__clang_call_terminate(i8*)
declare void @_ZSt9terminatev()
declare %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* returned)
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