org.graalvm.compiler.replacements.classfile

Class ClassfileBytecodeProvider

java.lang.Object

org.graalvm.compiler.replacements.classfile.ClassfileBytecodeProvider

All Implemented Interfaces:

BytecodeProvider

public final class ClassfileBytecodeProvider
extends Object
implements BytecodeProvider

A BytecodeProvider that provides bytecode properties of a ResolvedJavaMethod as parsed from a class file. This avoids all instrumentation and any bytecode rewriting performed by the VM. This mechanism retrieves class files based on the name and ClassLoader of existing Class instances. It bypasses all VM parsing and verification of the class file and assumes the class files are well formed. As such, it should only be used for classes from a trusted source such as the boot class (or module) path. A combination of Class.forName(String) and an existing MetaAccessProvider is used to resolve constant pool references. This opens up the opportunity for linkage errors if the referee is structurally changed through redefinition (e.g., a referred to method is renamed or deleted). This will result in an appropriate LinkageError being thrown. The only way to avoid this is to have a completely isolated jdk.vm.ci.meta implementation for parsing snippet/intrinsic bytecodes.

Constructor Summary

Constructors

Constructor and Description
ClassfileBytecodeProvider(MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection)
ClassfileBytecodeProvider(MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection, ClassLoader loader)

Method Summary

Modifier and Type	Method and Description
Bytecode	getBytecode(ResolvedJavaMethod method) Gets a Bytecode object that supplies bytecode properties for method.
boolean	shouldRecordMethodDependencies() Determines if methods parsed using this provider should be recorded so that method redefinition can invalidate the resulting code.
boolean	supportsInvokedynamic() Determines if this provider supports the INVOKEDYNAMIC bytecode.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ClassfileBytecodeProvider

public ClassfileBytecodeProvider(MetaAccessProvider metaAccess,
                                 SnippetReflectionProvider snippetReflection)

ClassfileBytecodeProvider

public ClassfileBytecodeProvider(MetaAccessProvider metaAccess,
                                 SnippetReflectionProvider snippetReflection,
                                 ClassLoader loader)

Method Detail

getBytecode

public Bytecode getBytecode(ResolvedJavaMethod method)

Description copied from interface: BytecodeProvider

Gets a Bytecode object that supplies bytecode properties for method.

Specified by:

getBytecode in interface BytecodeProvider

supportsInvokedynamic

public boolean supportsInvokedynamic()

Description copied from interface: BytecodeProvider

Determines if this provider supports the INVOKEDYNAMIC bytecode.

Specified by:

supportsInvokedynamic in interface BytecodeProvider

shouldRecordMethodDependencies

public boolean shouldRecordMethodDependencies()

Description copied from interface: BytecodeProvider

Determines if methods parsed using this provider should be recorded so that method redefinition can invalidate the resulting code.

Specified by:

shouldRecordMethodDependencies in interface BytecodeProvider