src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotForeignCallLinkage.java
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package org.graalvm.compiler.hotspot;
import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;
import org.graalvm.compiler.core.target.Backend;
import org.graalvm.compiler.hotspot.stubs.Stub;
import jdk.internal.vm.compiler.word.LocationIdentity;
import jdk.vm.ci.meta.InvokeTarget;
/**
* The details required to link a HotSpot runtime or stub call.
*/
public interface HotSpotForeignCallLinkage extends ForeignCallLinkage, InvokeTarget {
/**
* Constants for specifying whether a foreign call destroys or preserves registers. A foreign
* call will always destroy {@link HotSpotForeignCallLinkage#getOutgoingCallingConvention() its}
* {@linkplain ForeignCallLinkage#getTemporaries() temporary} registers.
*/
enum RegisterEffect {
DESTROYS_ALL_CALLER_SAVE_REGISTERS,
COMPUTES_REGISTERS_KILLED
}
/**
* Constants for specifying whether a call is a leaf or not and whether a
* {@code JavaFrameAnchor} prologue and epilogue is required around the call. A leaf function
* does not lock, GC or throw exceptions.
*/
enum Transition {
/**
* A call to a leaf function that is guaranteed to not use floating point registers.
* Consequently, floating point registers cleanup will be waived. On AMD64, this means the
* compiler will no longer emit vzeroupper instruction around the foreign call, which it
* normally does for unknown foreign calls to avoid potential SSE-AVX transition penalty.
* Besides, this foreign call will never have its caller stack inspected by the VM. That is,
* {@code JavaFrameAnchor} management around the call can be omitted.
*/
LEAF_NO_VZERO,
/**
* A call to a leaf function that might use floating point registers but will never have its
* caller stack inspected. That is, {@code JavaFrameAnchor} management around the call can
* be omitted.
*/
LEAF,
/**
* A call to a leaf function that might use floating point registers and may have its caller
* stack inspected. That is, {@code JavaFrameAnchor} management code around the call is
* required.
*/
STACK_INSPECTABLE_LEAF,
/**
* A function that may lock, GC or raise an exception and thus requires debug info to be
* associated with a call site to the function. The execution stack may be inspected while
* in the called function. That is, {@code JavaFrameAnchor} management code around the call
* is required.
*/
SAFEPOINT,
}
/**
* Constants specifying when a foreign call or stub call is re-executable.
*/
enum Reexecutability {
/**
* Denotes a call that cannot be re-executed. If an exception is raised, the call is
* deoptimized and the exception is passed on to be dispatched. If the call can throw an
* exception it needs to have a precise frame state.
*/
NOT_REEXECUTABLE,
/**
* Denotes a call that can always be re-executed. If an exception is raised by the call it
* may be cleared, compiled code deoptimized and reexecuted. Since the call has no side
* effects it is assumed that the same exception will be thrown.
*/
REEXECUTABLE
}
/**
* Sentinel marker for a computed jump address.
*/
long JUMP_ADDRESS = 0xDEADDEADBEEFBEEFL;
/**
* Determines if the call has side effects.
*/
boolean isReexecutable();
LocationIdentity[] getKilledLocations();
void setCompiledStub(Stub stub);
RegisterEffect getEffect();
/**
* Determines if this is a call to a compiled {@linkplain Stub stub}.
*/
boolean isCompiledStub();
/**
* Gets the stub, if any, this foreign call links to.
*/
Stub getStub();
void finalizeAddress(Backend backend);
long getAddress();
/**
* Determines if the runtime function or stub might use floating point registers. If the answer
* is no, then no FPU state management prologue or epilogue needs to be emitted around the call.
*/
boolean mayContainFP();
/**
* Determines if a {@code JavaFrameAnchor} needs to be set up and torn down around this call.
*/
boolean needsJavaFrameAnchor();
/**
* Gets the VM symbol associated with the target {@linkplain #getAddress() address} of the call.
*/
String getSymbol();
/**
* Identifies foreign calls which are guaranteed to include a safepoint check.
*/
boolean isGuaranteedSafepoint();
}