265 lines
9.6 KiB
C++
265 lines
9.6 KiB
C++
/*
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* Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_RUNTIME_JAVACALLS_HPP
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#define SHARE_VM_RUNTIME_JAVACALLS_HPP
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#include "memory/allocation.hpp"
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#include "oops/method.hpp"
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#include "runtime/handles.hpp"
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#include "runtime/javaFrameAnchor.hpp"
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#include "runtime/thread.hpp"
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#include "runtime/vmThread.hpp"
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#include "utilities/macros.hpp"
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#include CPU_HEADER(jniTypes)
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// A JavaCallWrapper is constructed before each JavaCall and destructed after the call.
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// Its purpose is to allocate/deallocate a new handle block and to save/restore the last
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// Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack.
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class JavaCallWrapper: StackObj {
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friend class VMStructs;
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private:
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JavaThread* _thread; // the thread to which this call belongs
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JNIHandleBlock* _handles; // the saved handle block
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Method* _callee_method; // to be able to collect arguments if entry frame is top frame
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oop _receiver; // the receiver of the call (if a non-static call)
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JavaFrameAnchor _anchor; // last thread anchor state that we must restore
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JavaValue* _result; // result value
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public:
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// Construction/destruction
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JavaCallWrapper(const methodHandle& callee_method, Handle receiver, JavaValue* result, TRAPS);
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~JavaCallWrapper();
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// Accessors
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JavaThread* thread() const { return _thread; }
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JNIHandleBlock* handles() const { return _handles; }
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JavaFrameAnchor* anchor(void) { return &_anchor; }
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JavaValue* result() const { return _result; }
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// GC support
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Method* callee_method() { return _callee_method; }
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oop receiver() { return _receiver; }
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void oops_do(OopClosure* f);
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bool is_first_frame() const { return _anchor.last_Java_sp() == NULL; }
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};
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// Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args)
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class JavaCallArguments : public StackObj {
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private:
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enum Constants {
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_default_size = 8 // Must be at least # of arguments in JavaCalls methods
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};
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intptr_t _value_buffer [_default_size + 1];
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u_char _value_state_buffer[_default_size + 1];
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intptr_t* _value;
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u_char* _value_state;
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int _size;
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int _max_size;
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bool _start_at_zero; // Support late setting of receiver
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JVMCI_ONLY(nmethod* _alternative_target;) // Nmethod that should be called instead of normal target
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void initialize() {
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// Starts at first element to support set_receiver.
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_value = &_value_buffer[1];
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_value_state = &_value_state_buffer[1];
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_max_size = _default_size;
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_size = 0;
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_start_at_zero = false;
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JVMCI_ONLY(_alternative_target = NULL;)
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}
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// Helper for push_oop and the like. The value argument is a
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// "handle" that refers to an oop. We record the address of the
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// handle rather than the designated oop. The handle is later
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// resolved to the oop by parameters(). This delays the exposure of
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// naked oops until it is GC-safe.
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template<typename T>
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inline int push_oop_impl(T handle, int size) {
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// JNITypes::put_obj expects an oop value, so we play fast and
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// loose with the type system. The cast from handle type to oop
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// *must* use a C-style cast. In a product build it performs a
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// reinterpret_cast. In a debug build (more accurately, in a
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// CHECK_UNHANDLED_OOPS build) it performs a static_cast, invoking
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// the debug-only oop class's conversion from void* constructor.
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JNITypes::put_obj((oop)handle, _value, size); // Updates size.
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return size; // Return the updated size.
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}
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public:
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JavaCallArguments() { initialize(); }
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JavaCallArguments(Handle receiver) {
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initialize();
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push_oop(receiver);
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}
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JavaCallArguments(int max_size) {
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if (max_size > _default_size) {
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_value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1);
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_value_state = NEW_RESOURCE_ARRAY(u_char, max_size + 1);
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// Reserve room for potential receiver in value and state
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_value++;
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_value_state++;
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_max_size = max_size;
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_size = 0;
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_start_at_zero = false;
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JVMCI_ONLY(_alternative_target = NULL;)
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} else {
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initialize();
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}
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}
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#if INCLUDE_JVMCI
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void set_alternative_target(nmethod* target) {
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_alternative_target = target;
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}
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nmethod* alternative_target() {
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return _alternative_target;
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}
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#endif
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// The possible values for _value_state elements.
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enum {
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value_state_primitive,
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value_state_oop,
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value_state_handle,
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value_state_jobject,
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value_state_limit
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};
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inline void push_oop(Handle h) {
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_value_state[_size] = value_state_handle;
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_size = push_oop_impl(h.raw_value(), _size);
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}
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inline void push_jobject(jobject h) {
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_value_state[_size] = value_state_jobject;
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_size = push_oop_impl(h, _size);
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}
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inline void push_int(int i) {
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_value_state[_size] = value_state_primitive;
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JNITypes::put_int(i, _value, _size);
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}
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inline void push_double(double d) {
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_value_state[_size] = value_state_primitive;
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_value_state[_size + 1] = value_state_primitive;
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JNITypes::put_double(d, _value, _size);
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}
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inline void push_long(jlong l) {
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_value_state[_size] = value_state_primitive;
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_value_state[_size + 1] = value_state_primitive;
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JNITypes::put_long(l, _value, _size);
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}
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inline void push_float(float f) {
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_value_state[_size] = value_state_primitive;
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JNITypes::put_float(f, _value, _size);
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}
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// receiver
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Handle receiver() {
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assert(_size > 0, "must at least be one argument");
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assert(_value_state[0] == value_state_handle,
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"first argument must be an oop");
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assert(_value[0] != 0, "receiver must be not-null");
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return Handle((oop*)_value[0], false);
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}
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void set_receiver(Handle h) {
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assert(_start_at_zero == false, "can only be called once");
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_start_at_zero = true;
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_value_state--;
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_value--;
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_size++;
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_value_state[0] = value_state_handle;
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push_oop_impl(h.raw_value(), 0);
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}
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// Converts all Handles to oops, and returns a reference to parameter vector
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intptr_t* parameters() ;
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int size_of_parameters() const { return _size; }
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// Verify that pushed arguments fits a given method
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void verify(const methodHandle& method, BasicType return_type);
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};
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// All calls to Java have to go via JavaCalls. Sets up the stack frame
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// and makes sure that the last_Java_frame pointers are chained correctly.
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//
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class JavaCalls: AllStatic {
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static void call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS);
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public:
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// call_special
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// ------------
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// The receiver must be first oop in argument list
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static void call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS);
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static void call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS); // No args
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static void call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS);
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static void call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS);
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// virtual call
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// ------------
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// The receiver must be first oop in argument list
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static void call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS);
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static void call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS); // No args
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static void call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS);
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static void call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS);
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// Static call
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// -----------
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static void call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS);
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static void call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS);
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static void call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS);
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static void call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS);
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static void call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS);
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// Low-level interface
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static void call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS);
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};
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#endif // SHARE_VM_RUNTIME_JAVACALLS_HPP
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