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8253842: [JVMCI] Allow implicit exception to dispatch to other addres…
…s in jvmci compilers.

Reviewed-by: kvn
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Yudi Zheng authored and Doug Simon committed Oct 5, 2020
1 parent 289ae79 commit 5d4a1350d0c2c87acc9a44bc36688103ba19c216
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Showing 4 changed files with 91 additions and 2 deletions.
@@ -897,8 +897,14 @@ JVMCI::CodeInstallResult CodeInstaller::initialize_buffer(CodeBuffer& buffer, bo
JVMCI_ERROR_OK("method contains safepoint, but has no deopt rescue slot");
if (JVMCIENV->equals(reason, jvmci_env()->get_site_InfopointReason_IMPLICIT_EXCEPTION())) {
JVMCI_event_4("implicit exception at %i", pc_offset);
if (jvmci_env()->isa_site_ImplicitExceptionDispatch(site)) {
jint dispatch_offset = jvmci_env()->get_site_ImplicitExceptionDispatch_dispatchOffset(site);
JVMCI_event_4("implicit exception at %i, dispatch to %i", pc_offset, dispatch_offset);
_implicit_exception_table.append(pc_offset, dispatch_offset);
} else {
JVMCI_event_4("implicit exception at %i", pc_offset);
} else {
JVMCI_event_4("infopoint at %i", pc_offset);
@@ -177,6 +177,9 @@
object_field(site_Call, target, "Ljdk/vm/ci/meta/InvokeTarget;") \
boolean_field(site_Call, direct) \
end_class \
start_class(site_ImplicitExceptionDispatch, jdk_vm_ci_code_site_ImplicitExceptionDispatch) \
int_field(site_ImplicitExceptionDispatch, dispatchOffset) \
end_class \
start_class(site_DataPatch, jdk_vm_ci_code_site_DataPatch) \
object_field(site_DataPatch, reference, "Ljdk/vm/ci/code/site/Reference;") \
end_class \
@@ -92,6 +92,7 @@
template(jdk_vm_ci_code_site_DataSectionReference, "jdk/vm/ci/code/site/DataSectionReference") \
template(jdk_vm_ci_code_site_ExceptionHandler, "jdk/vm/ci/code/site/ExceptionHandler") \
template(jdk_vm_ci_code_site_Mark, "jdk/vm/ci/code/site/Mark") \
template(jdk_vm_ci_code_site_ImplicitExceptionDispatch, "jdk/vm/ci/code/site/ImplicitExceptionDispatch") \
template(jdk_vm_ci_code_site_Infopoint, "jdk/vm/ci/code/site/Infopoint") \
template(jdk_vm_ci_code_stack_InspectedFrameVisitor, "jdk/vm/ci/code/stack/InspectedFrameVisitor") \
template(jdk_vm_ci_code_site_Site, "jdk/vm/ci/code/site/Site") \
@@ -0,0 +1,79 @@
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit if you need additional information or have any
* questions.


* Represents an implicit exception dispatch in the code. Implicit exception dispatch is a
* platform-specific optimization that makes use of an operating system's trap mechanism, to turn
* specific branches into sequential code with implicit traps. Information contained in this class
* will be used by the runtime to register implicit exception dispatch, i.e., a mapping from an
* exceptional PC offset to a continuation PC offset.
public final class ImplicitExceptionDispatch extends Infopoint {

public final int dispatchOffset;

* Construct an implicit exception dispatch.
* @param pcOffset the exceptional PC offset
* @param dispatchOffset the continuation PC offset
* @param debugInfo debugging information at the exceptional PC
public ImplicitExceptionDispatch(int pcOffset, int dispatchOffset, DebugInfo debugInfo) {
super(pcOffset, debugInfo, InfopointReason.IMPLICIT_EXCEPTION);
this.dispatchOffset = dispatchOffset;

public boolean equals(Object obj) {
if (this == obj) {
return true;
if (obj instanceof ImplicitExceptionDispatch && super.equals(obj)) {
ImplicitExceptionDispatch that = (ImplicitExceptionDispatch) obj;
if (this.dispatchOffset == that.dispatchOffset) {
return true;
return false;

public String toString() {
StringBuilder sb = new StringBuilder();

if (debugInfo != null) {
appendDebugInfo(sb, debugInfo);

return sb.toString();

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