195a62e9ae
Summary: Before when we implemented the first EH proposal, 'catch <tag>' instruction may not catch an exception so there were multiple EH pads an exception can unwind to. That means a BB could have multiple EH pad successors. Now after we switched to the new proposal, every 'catch' instruction catches an exception, and there is only one catchpad per catchswitch, so we at most have one EH pad successor, making `ThrowUnwindDest` map in `WasmEHInfo` unnecessary. Keeping `ThrowUnwindDest` map in `WasmEHInfo` has its own problems, because other optimization passes can split a BB that contains possibly throwing calls (previously invokes), and we have to update the map every time that happens, which is not easy for common CodeGen passes. This also correctly updates successor info in LateEHPrepare when we add a rethrow instruction. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58486 llvm-svn: 355296
302 lines
12 KiB
LLVM
302 lines
12 KiB
LLVM
; 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
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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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@_ZTIi = external constant i8*
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@_ZTId = external constant i8*
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; Simple test case with two catch clauses
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;
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; void foo();
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; void test0() {
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; try {
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; foo();
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; } catch (int) {
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; } catch (double) {
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; }
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; }
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; CHECK-LABEL: test0
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK: block
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; CHECK: br_if 0, {{.*}} # 0: down to label2
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; CHECK: i32.call $drop=, __cxa_begin_catch
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; CHECK: call __cxa_end_catch
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; CHECK: br 1 # 1: down to label0
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; CHECK: end_block # label2:
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; CHECK: block
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; CHECK: br_if 0, {{.*}} # 0: down to label3
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; CHECK: i32.call $drop=, __cxa_begin_catch
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; CHECK: call __cxa_end_catch
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; CHECK: br 1 # 1: down to label0
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; CHECK: end_block # label3:
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; CHECK: call __cxa_rethrow
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; CHECK: end_try # label0:
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define void @test0() 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*), i8* bitcast (i8** @_ZTId 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 %catch2, label %catch.fallthrough
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catch2: ; 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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catch.fallthrough: ; preds = %catch.start
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%6 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTId to i8*))
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%matches1 = icmp eq i32 %3, %6
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br i1 %matches1, label %catch, label %rethrow
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catch: ; preds = %catch.fallthrough
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%7 = 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.fallthrough
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call void @__cxa_rethrow() [ "funclet"(token %1) ]
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unreachable
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try.cont: ; preds = %entry, %catch, %catch2
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ret void
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}
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; Nested try-catches within a catch
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; void test1() {
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; try {
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; foo();
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; } catch (int) {
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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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; }
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; CHECK-LABEL: test1
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK: block
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; CHECK: block
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; CHECK: br_if 0, {{.*}} # 0: down to label7
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; CHECK: i32.call $drop=, __cxa_begin_catch
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; CHECK: try
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; CHECK: call foo
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; CHECK: br 2 # 2: down to label6
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; CHECK: catch
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; CHECK: try
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; CHECK: block
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; CHECK: br_if 0, {{.*}} # 0: down to label11
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; CHECK: i32.call $drop=, __cxa_begin_catch
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; CHECK: try
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; CHECK: call foo
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; CHECK: br 2 # 2: down to label9
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; CHECK: catch
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; CHECK: call __cxa_end_catch
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; CHECK: rethrow # down to catch3
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; CHECK: end_try
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; CHECK: end_block # label11:
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; CHECK: call __cxa_rethrow
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; CHECK: unreachable
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; CHECK: catch {{.*}} # catch3:
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; CHECK: call __cxa_end_catch
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; CHECK: rethrow # to caller
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; CHECK: end_try # label9:
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; CHECK: call __cxa_end_catch
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; CHECK: br 2 # 2: down to label6
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; CHECK: end_try
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; CHECK: end_block # label7:
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; CHECK: call __cxa_rethrow
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; CHECK: unreachable
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; CHECK: end_block # label6:
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; CHECK: call __cxa_end_catch
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; CHECK: end_try
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define void @test1() 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.cont11 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 i32*
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%7 = load i32, i32* %6, align 4
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invoke void @foo() [ "funclet"(token %1) ]
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to label %try.cont unwind label %catch.dispatch2
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catch.dispatch2: ; preds = %catch
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%8 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup9
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catch.start3: ; preds = %catch.dispatch2
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%9 = catchpad within %8 [i8* bitcast (i8** @_ZTIi to i8*)]
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%10 = call i8* @llvm.wasm.get.exception(token %9)
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%11 = call i32 @llvm.wasm.get.ehselector(token %9)
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%12 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
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%matches4 = icmp eq i32 %11, %12
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br i1 %matches4, label %catch6, label %rethrow5
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catch6: ; preds = %catch.start3
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%13 = call i8* @__cxa_begin_catch(i8* %10) [ "funclet"(token %9) ]
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%14 = bitcast i8* %13 to i32*
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%15 = load i32, i32* %14, align 4
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invoke void @foo() [ "funclet"(token %9) ]
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to label %invoke.cont8 unwind label %ehcleanup
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invoke.cont8: ; preds = %catch6
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call void @__cxa_end_catch() [ "funclet"(token %9) ]
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catchret from %9 to label %try.cont
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rethrow5: ; preds = %catch.start3
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invoke void @__cxa_rethrow() [ "funclet"(token %9) ]
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to label %unreachable unwind label %ehcleanup9
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try.cont: ; preds = %catch, %invoke.cont8
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call void @__cxa_end_catch() [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont11
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rethrow: ; preds = %catch.start
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call void @__cxa_rethrow() [ "funclet"(token %1) ]
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unreachable
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try.cont11: ; preds = %entry, %try.cont
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ret void
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ehcleanup: ; preds = %catch6
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%16 = cleanuppad within %9 []
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call void @__cxa_end_catch() [ "funclet"(token %16) ]
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cleanupret from %16 unwind label %ehcleanup9
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ehcleanup9: ; preds = %ehcleanup, %rethrow5, %catch.dispatch2
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%17 = cleanuppad within %1 []
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call void @__cxa_end_catch() [ "funclet"(token %17) ]
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cleanupret from %17 unwind to caller
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unreachable: ; preds = %rethrow5
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unreachable
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}
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; Nested loop within a catch clause
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; void test2() {
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; try {
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; foo();
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; } catch (...) {
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; for (int i = 0; i < 50; i++)
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; foo();
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; }
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; }
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; CHECK-LABEL: test2
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; CHECK: try
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; CHECK: call foo
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; CHECK: catch
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; CHECK: i32.call $drop=, __cxa_begin_catch
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; CHECK: loop # label15:
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; CHECK: block
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; CHECK: block
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; CHECK: br_if 0, {{.*}} # 0: down to label17
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; CHECK: try
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; CHECK: call foo
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; CHECK: br 2 # 2: down to label16
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; CHECK: catch
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; CHECK: try
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; CHECK: call __cxa_end_catch
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; CHECK: catch
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; CHECK: call __clang_call_terminate
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; CHECK: unreachable
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; CHECK: end_try
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; CHECK: rethrow # to caller
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; CHECK: end_try
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; CHECK: end_block # label17:
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; CHECK: call __cxa_end_catch
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; CHECK: br 2 # 2: down to label13
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; CHECK: end_block # label16:
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; CHECK: br 0 # 0: up to label15
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; CHECK: end_loop
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; CHECK: end_try # label13:
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define void @test2() 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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br label %for.cond
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for.cond: ; preds = %for.inc, %catch.start
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%i.0 = phi i32 [ 0, %catch.start ], [ %inc, %for.inc ]
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%cmp = icmp slt i32 %i.0, 50
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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invoke void @foo() [ "funclet"(token %1) ]
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to label %for.inc unwind label %ehcleanup
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for.inc: ; preds = %for.body
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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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 = %for.end, %entry
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ret void
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ehcleanup: ; preds = %for.body
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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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declare void @foo()
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declare void @bar()
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declare i32 @__gxx_wasm_personality_v0(...)
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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 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 @__cxa_rethrow()
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declare void @__clang_call_terminate(i8*)
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declare void @_ZSt9terminatev()
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