9e4eadeb13
This implements basic instructions for the new spec.
- Adds new versions of instructions: `catch`, `catch_all`, and `rethrow`
- Adds support for instruction selection for the new instructions
- `catch` needs a custom routine for the same reason `throw` needs one,
to encode `__cpp_exception` tag symbol.
- Updates `WebAssembly::isCatch` utility function to include `catch_all`
and Change code that compares an instruction's opcode with `catch` to
use that function.
- LateEHPrepare
- Previously in LateEHPrepare we added `catch` instruction to both
`catchpad`s (for user catches) and `cleanuppad`s (for destructors).
In the new version `catch` is generated from `llvm.catch` intrinsic
in instruction selection phase, so we only need to add `catch_all`
to the beginning of cleanup pads.
- `catch` is generated from instruction selection, but we need to
hoist the `catch` instruction to the beginning of every EH pad,
because `catch` can be in the middle of the EH pad or even in a
split BB from it after various code transformations.
- Removes `addExceptionExtraction` function, which was used to
generate `br_on_exn` before.
- CFGStackfiy: Deletes `fixUnwindMismatches` function. Running this
function on the new instruction causes crashes, and the new version
will be added in a later CL, whose contents will be completely
different. So deleting the whole function will make the diff easier to
read.
- Reenables all disabled tests in exception.ll and eh-lsda.ll and a
single basic test in cfg-stackify-eh.ll.
- Updates existing tests to use the new assembly format. And deletes
`br_on_exn` instructions from the tests and FileCheck lines.
Reviewed By: dschuff, tlively
Differential Revision: https://reviews.llvm.org/D94040
368 lines
13 KiB
LLVM
368 lines
13 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs | FileCheck -allow-deprecated-dag-overlap %s
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; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-keep-registers -exception-model=wasm -mattr=+exception-handling
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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%struct.Temp = type { i8 }
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@_ZTIi = external dso_local constant i8*
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; CHECK-LABEL: test_throw:
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; CHECK: throw __cpp_exception, $0
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; CHECK-NOT: unreachable
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define void @test_throw(i8* %p) {
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call void @llvm.wasm.throw(i32 0, i8* %p)
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ret void
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}
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; Simple test with a try-catch
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;
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; void foo();
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; void test_catch() {
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; try {
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; foo();
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; } catch (int) {
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; }
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; }
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; CHECK-LABEL: test_catch:
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; CHECK: global.get ${{.+}}=, __stack_pointer
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch $[[EXN:[0-9]+]]=, __cpp_exception
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; CHECK: global.set __stack_pointer
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; CHECK: i32.{{store|const}} {{.*}} __wasm_lpad_context
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; CHECK: call $drop=, _Unwind_CallPersonality, $[[EXN]]
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; CHECK: block
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; CHECK: br_if 0
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; CHECK: call $drop=, __cxa_begin_catch
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; CHECK: call __cxa_end_catch
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; CHECK: br 1
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; CHECK: end_block
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; CHECK: rethrow 0
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; CHECK: end_try
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define void @test_catch() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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invoke void @foo()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch.start] unwind to caller
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catch.start: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
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%2 = call i8* @llvm.wasm.get.exception(token %1)
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%3 = call i32 @llvm.wasm.get.ehselector(token %1)
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%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
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%matches = icmp eq i32 %3, %4
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br i1 %matches, label %catch, label %rethrow
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catch: ; preds = %catch.start
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%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
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call void @__cxa_end_catch() [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont
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rethrow: ; preds = %catch.start
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call void @llvm.wasm.rethrow() [ "funclet"(token %1) ]
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unreachable
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try.cont: ; preds = %catch, %entry
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ret void
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}
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; Destructor (cleanup) test
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;
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; void foo();
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; struct Temp {
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; ~Temp() {}
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; };
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; void test_cleanup() {
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; Temp t;
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; foo();
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; }
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; CHECK-LABEL: test_cleanup:
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch_all
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; CHECK: global.set __stack_pointer
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; CHECK: call $drop=, _ZN4TempD2Ev
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; CHECK: rethrow 0
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; CHECK: end_try
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define void @test_cleanup() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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%t = alloca %struct.Temp, align 1
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invoke void @foo()
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to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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%call = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t)
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ret void
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ehcleanup: ; preds = %entry
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%0 = cleanuppad within none []
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%call1 = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t) [ "funclet"(token %0) ]
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cleanupret from %0 unwind to caller
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}
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; Calling a function that may throw within a 'catch (...)' generates a
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; temrinatepad, because __cxa_end_catch() also can throw within 'catch (...)'.
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;
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; void foo();
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; void test_terminatepad() {
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; try {
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; foo();
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; } catch (...) {
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; foo();
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; }
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; }
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; CHECK-LABEL: test_terminatepad
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK: call $drop=, __cxa_begin_catch
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch_all
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; CHECK: try
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; CHECK: call __cxa_end_catch
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; CHECK: catch $[[EXN:[0-9]+]]=, __cpp_exception
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; CHECK: call __clang_call_terminate, $[[EXN]]
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; CHECK: unreachable
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; CHECK: end_try
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; CHECK: rethrow
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; CHECK: end_try
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; CHECK: call __cxa_end_catch
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; CHECK: end_try
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define void @test_terminatepad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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invoke void @foo()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch.start] unwind to caller
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catch.start: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* null]
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%2 = call i8* @llvm.wasm.get.exception(token %1)
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%3 = call i32 @llvm.wasm.get.ehselector(token %1)
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%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
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invoke void @foo() [ "funclet"(token %1) ]
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to label %invoke.cont1 unwind label %ehcleanup
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invoke.cont1: ; preds = %catch.start
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call void @__cxa_end_catch() [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont
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try.cont: ; preds = %invoke.cont1, %entry
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ret void
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ehcleanup: ; preds = %catch.start
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%5 = cleanuppad within %1 []
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invoke void @__cxa_end_catch() [ "funclet"(token %5) ]
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to label %invoke.cont2 unwind label %terminate
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invoke.cont2: ; preds = %ehcleanup
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cleanupret from %5 unwind to caller
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terminate: ; preds = %ehcleanup
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%6 = cleanuppad within %5 []
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%7 = call i8* @llvm.wasm.get.exception(token %6)
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call void @__clang_call_terminate(i8* %7) [ "funclet"(token %6) ]
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unreachable
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}
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; Tests prologues and epilogues are not generated within EH scopes.
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; They should not be treated as funclets; BBs starting with a catch instruction
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; should not have a prologue, and BBs ending with a catchret/cleanupret should
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; not have an epilogue. This is separate from __stack_pointer restoring
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; instructions after a catch instruction.
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;
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; void bar(int) noexcept;
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; void test_no_prolog_epilog_in_ehpad() {
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; int stack_var = 0;
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; bar(stack_var);
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; try {
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; foo();
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; } catch (int) {
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; foo();
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; }
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; }
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; CHECK-LABEL: test_no_prolog_epilog_in_ehpad
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK-NOT: global.get $push{{.+}}=, __stack_pointer
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; CHECK: global.set __stack_pointer
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; CHECK: block
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; CHECK: block
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; CHECK: br_if 0
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; CHECK: call $drop=, __cxa_begin_catch
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK-NOT: global.get $push{{.+}}=, __stack_pointer
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; CHECK: global.set __stack_pointer
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; CHECK: call __cxa_end_catch
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; CHECK: rethrow
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; CHECK-NOT: global.set __stack_pointer, $pop{{.+}}
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; CHECK: end_try
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; CHECK: end_block
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; CHECK: rethrow
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; CHECK: end_block
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; CHECK-NOT: global.set __stack_pointer, $pop{{.+}}
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; CHECK: call __cxa_end_catch
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; CHECK: end_try
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define void @test_no_prolog_epilog_in_ehpad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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%stack_var = alloca i32, align 4
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call void @bar(i32* %stack_var)
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invoke void @foo()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch.start] unwind to caller
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catch.start: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
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%2 = call i8* @llvm.wasm.get.exception(token %1)
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%3 = call i32 @llvm.wasm.get.ehselector(token %1)
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%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
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%matches = icmp eq i32 %3, %4
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br i1 %matches, label %catch, label %rethrow
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catch: ; preds = %catch.start
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%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
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%6 = bitcast i8* %5 to float*
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%7 = load float, float* %6, align 4
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invoke void @foo() [ "funclet"(token %1) ]
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to label %invoke.cont1 unwind label %ehcleanup
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invoke.cont1: ; preds = %catch
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call void @__cxa_end_catch() [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont
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rethrow: ; preds = %catch.start
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call void @llvm.wasm.rethrow() [ "funclet"(token %1) ]
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unreachable
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try.cont: ; preds = %invoke.cont1, %entry
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ret void
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ehcleanup: ; preds = %catch
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%8 = cleanuppad within %1 []
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call void @__cxa_end_catch() [ "funclet"(token %8) ]
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cleanupret from %8 unwind to caller
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}
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; When a function does not have stack-allocated objects, it does not need to
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; store SP back to __stack_pointer global at the epilog.
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;
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; void foo();
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; void test_no_sp_writeback() {
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; try {
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; foo();
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; } catch (...) {
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; }
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; }
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; CHECK-LABEL: test_no_sp_writeback
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK: call $drop=, __cxa_begin_catch
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; CHECK: call __cxa_end_catch
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; CHECK: end_try
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; CHECK-NOT: global.set __stack_pointer
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; CHECK: return
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define void @test_no_sp_writeback() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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invoke void @foo()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch.start] unwind to caller
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catch.start: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* null]
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%2 = call i8* @llvm.wasm.get.exception(token %1)
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%3 = call i32 @llvm.wasm.get.ehselector(token %1)
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%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
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call void @__cxa_end_catch() [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont
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try.cont: ; preds = %catch.start, %entry
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ret void
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}
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; When the result of @llvm.wasm.get.exception is not used. This is created to
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; fix a bug in LateEHPrepare and this should not crash.
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define void @test_get_exception_wo_use() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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invoke void @foo()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch.start] unwind to caller
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catch.start: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* null]
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%2 = call i8* @llvm.wasm.get.exception(token %1)
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%3 = call i32 @llvm.wasm.get.ehselector(token %1)
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catchret from %1 to label %try.cont
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try.cont: ; preds = %catch.start, %entry
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ret void
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}
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; Tests a case when a cleanup region (cleanuppad ~ clanupret) contains another
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; catchpad
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define void @test_complex_cleanup_region() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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invoke void @foo()
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to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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ret void
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ehcleanup: ; preds = %entry
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%0 = cleanuppad within none []
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invoke void @foo() [ "funclet"(token %0) ]
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to label %ehcleanupret unwind label %catch.dispatch
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catch.dispatch: ; preds = %ehcleanup
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%1 = catchswitch within %0 [label %catch.start] unwind label %ehcleanup.1
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catch.start: ; preds = %catch.dispatch
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%2 = catchpad within %1 [i8* null]
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%3 = call i8* @llvm.wasm.get.exception(token %2)
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%4 = call i32 @llvm.wasm.get.ehselector(token %2)
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catchret from %2 to label %ehcleanupret
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ehcleanup.1: ; preds = %catch.dispatch
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%5 = cleanuppad within %0 []
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unreachable
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ehcleanupret: ; preds = %catch.start, %ehcleanup
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cleanupret from %0 unwind to caller
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}
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declare void @foo()
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declare void @bar(i32*)
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declare i32 @__gxx_wasm_personality_v0(...)
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declare void @llvm.wasm.throw(i32, i8*)
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declare i8* @llvm.wasm.get.exception(token)
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declare i32 @llvm.wasm.get.ehselector(token)
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declare void @llvm.wasm.rethrow()
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declare i32 @llvm.eh.typeid.for(i8*)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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declare void @__clang_call_terminate(i8*)
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declare %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* returned)
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; CHECK: __cpp_exception:
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; CHECK: .eventtype __cpp_exception i32
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