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package com.oracle.truffle.api;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
/**
* Directives that influence the optimizations of the host compiler. These operations affect how the
* Truffle interpreter is itself compiled.
*
* @since 21.0
*/
public final class HostCompilerDirectives {
/**
* This object is a placeholder for the static methods that implement compiler directives, and
* cannot be constructed.
*
* @since 21.0
*/
private HostCompilerDirectives() {
}
/**
* Marks a method that is an implementation of a Truffle interpreter, and which should receive
* additional optimization budget.
*
* This annotation is used to annotate the root method of a bytecode interpreter, and it hints
* the compiler to invest extra effort into optimizing such methods. Language implementers are
* advised to inspect the IR of the interpreter when using this.
*
* @since 21.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
public @interface BytecodeInterpreterSwitch {
}
/**
* Marks a method that is called from a Truffle interpreter, but is not called frequently and is
* not important for interpreter performance.
*
* This annotation is used to annotate methods that are called from a bytecode interpreter, but
* should generally not be inlined into the body of the bytecode interpreter. Language
* implementers are advised to inspect the IR of the interpreter when using this.
*
* @see BytecodeInterpreterSwitch to annotate the root method of a bytecode interpreter
*
* @deprecated use is no longer needed. boundaries for {@link BytecodeInterpreterSwitch} are
* mostly determined automatically. To migrate remove all usages.
* @since 21.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@Deprecated(since = "22.2")
public @interface BytecodeInterpreterSwitchBoundary {
}
/**
* Hints to Truffle host inlining that a particular method is partial evaluatable, but it would
* be a good place for a cutoff when performing host inlining. A host compiler may use this
* information as a hint to take trade-offs optimizing the code. Good examples of cutoffs are:
*
* - Methods related to instrumentation or tracing. Instrumentation and tracing are typically
* not critical for interpreter performance.
*
- Methods raising guest language exceptions. Such paths must often partially evaluate for
* good peak performance, but are not a priority to optimize during interpreter execution.
*
- Methods related to Truffle interoperability behavior. Such paths are typically only used
* exceptionally, as the vast majority of code is likely non-interop code.
*
- Methods that are very complex and would only deny other more important methods to be
* inlined.
*
* If a method is already annotated with {@link TruffleBoundary} or is dominated by a call to
* {@link CompilerDirectives#transferToInterpreterAndInvalidate() transferToInterpreter()} then
* this method has no effect, as any path that is not designed for partial evaluation is already
* considered a slow-path in hosted inlining.
*
* This annotation may be used to tune Truffle hosted inlining decisions. It is useful in cases
* where the host inliner did not have enough budget to exhaustively inline the entire partial
* evaluatable fast-path. In such a case it might be worthwhile to annotate rarely executed
* methods with {@link InliningCutoff} to reduce their priority to make room for more important
* methods.
*
* For more details on host inlining see the documentation
*
* @since 22.3
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
public @interface InliningCutoff {
}
}