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JITInterface.hpp
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/
JITInterface.hpp
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/*******************************************************************************
* Copyright (c) 1991, 2019 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#if !defined(JITINTERFACE_HPP_)
#define JITINTERFACE_HPP_
#include "j9port.h"
/* TODO: Implement jitVTableIndex() to remove this #include */
#if defined(J9VM_ARCH_AARCH64)
#include "assert.h"
#endif
extern "C" {
#if defined(J9VM_ARCH_X86)
#if defined(J9VM_ENV_DATA64)
/* x86-64 */
typedef struct {
union {
UDATA numbered[16];
struct {
UDATA rax;
UDATA rbx;
UDATA rcx;
UDATA rdx;
UDATA rdi;
UDATA rsi;
UDATA rbp;
UDATA rsp;
UDATA r8;
UDATA r9;
UDATA r10;
UDATA r11;
UDATA r12;
UDATA r13;
UDATA r14;
UDATA r15;
} named;
} gpr;
U_64 fpr[16];
} J9JITRegisters;
#else /*J9VM_ENV_DATA64 */
/* x86-32*/
typedef struct {
union {
UDATA numbered[8];
struct {
UDATA eax;
UDATA ebx;
UDATA ecx;
UDATA edx;
UDATA edi;
UDATA esi;
UDATA ebp;
UDATA esp;
} named;
} gpr;
U_64 fpr[8];
} J9JITRegisters;
#endif /* J9VM_ENV_DATA64 */
#elif defined(J9VM_ARCH_POWER)
typedef struct {
union {
UDATA numbered[32];
} gpr;
U_64 fpr[32];
UDATA cr;
UDATA lr;
} J9JITRegisters;
#elif defined(J9VM_ARCH_S390)
typedef struct {
union {
#if defined(J9VM_JIT_32BIT_USES64BIT_REGISTERS)
UDATA numbered[32];
#else
UDATA numbered[16];
#endif
} gpr;
U_64 fpr[16];
} J9JITRegisters;
#elif defined(J9VM_ARCH_ARM)
typedef struct {
union {
UDATA numbered[16];
} gpr;
U_64 fpr[16];
} J9JITRegisters;
#elif defined(J9VM_ARCH_AARCH64)
typedef struct {
union {
UDATA numbered[32];
} gpr;
U_64 fpr[32];
} J9JITRegisters;
#else
#error UNKNOWN PROCESSOR
#endif
} /* extern "C" */
class VM_JITInterface
{
/*
* Data members
*/
private:
protected:
public:
/*
* Function members
*/
private:
protected:
public:
static VMINLINE UDATA
jitVTableIndex(void *jitReturnAddress, UDATA interfaceVTableIndex)
{
UDATA jitVTableIndex = interfaceVTableIndex;
#if defined(J9VM_ARCH_X86)
if (0xE8 != ((U_8*)jitReturnAddress)[-5]) {
/* Virtual call - decode from instruction */
jitVTableIndex = (UDATA)(IDATA)(((I_32*)jitReturnAddress)[-1]);
}
#elif defined(J9VM_ARCH_POWER)
if (0x7D8903A6 == ((U_32*)jitReturnAddress)[-2]) {
U_32 minus3 = ((U_32*)jitReturnAddress)[-3];
/* always fetch low 16 bits of vTable index from virtual send */
IDATA methodIndex = (IDATA)(I_16)minus3;
/* determine if we are a >32k send */
U_32 minus4 = ((U_32*)jitReturnAddress)[-4];
if (0x3D800000 == (minus4 & 0xFFE00000)) {
if (0x000C0000 == (minus3 & 0x001F0000)) {
/* fetch high 16 bits of vTable index from virtual send and merge */
IDATA indexHigh = (IDATA)(I_16)minus4;
methodIndex += (indexHigh << 16);
}
}
jitVTableIndex = (UDATA)methodIndex;
}
#elif defined(J9VM_ARCH_ARM)
/* Virtual send layout is:
* ...
* ldr r15,[register - vTableOffset]
* <- return address points here
*
* Interface send layout is:
* ...
* b snippet
* <- return address points here
*/
UDATA instruction = ((U_32*)jitReturnAddress)[-1];
if (0x0410F000 == (instruction & 0x0E10F000)) {
/* Virtual - unsigned offset is in the low 12 bits, assume the sign bit is set (i.e. the offset is always negative) */
jitVTableIndex = 0 - (instruction & 0x00000FFF);
}
#elif defined(J9VM_ARCH_AARCH64)
/* TODO: Implement this */
assert(0);
#elif defined(J9VM_ARCH_S390)
/* The vtable index is always in the register */
#else
#error UNKNOWN PROCESSOR
#endif
return jitVTableIndex;
}
static VMINLINE void*
peekJITReturnAddress(J9VMThread *vmThread, UDATA *sp)
{
#if defined(J9VM_ARCH_X86)
return *(void**)sp;
#elif defined(J9VM_ARCH_POWER)
return (void*)((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->lr;
#elif defined(J9VM_ARCH_ARM)
return (void*)((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->gpr.numbered[14];
#elif defined(J9VM_ARCH_AARCH64)
return (void*)((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->gpr.numbered[30]; // LR
#elif defined(J9VM_ARCH_S390)
return (void*)((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->gpr.numbered[14];
#else
#error UNKNOWN PROCESSOR
#endif
}
static VMINLINE void
restoreJITReturnAddress(J9VMThread *vmThread, UDATA * &sp, void *returnAddress)
{
#if defined(J9VM_ARCH_X86)
*--sp = (UDATA)returnAddress;
#elif defined(J9VM_ARCH_POWER)
((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->lr = (UDATA)returnAddress;
#elif defined(J9VM_ARCH_ARM)
((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->gpr.numbered[14] = (UDATA)returnAddress;
#elif defined(J9VM_ARCH_AARCH64)
((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->gpr.numbered[30] = (UDATA)returnAddress; // LR
#elif defined(J9VM_ARCH_S390)
((J9JITRegisters*)vmThread->entryLocalStorage->jitGlobalStorageBase)->gpr.numbered[14] = (UDATA)returnAddress;
#else
#error UNKNOWN PROCESSOR
#endif
}
static VMINLINE void*
fetchJITReturnAddress(J9VMThread *vmThread, UDATA * &sp)
{
void *returnAddress = peekJITReturnAddress(vmThread, sp);
sp += J9SW_JIT_STACK_SLOTS_USED_BY_CALL;
return returnAddress;
}
static VMINLINE void
enableRuntimeInstrumentation(J9VMThread *currentThread)
{
#if defined(J9VM_JIT_RUNTIME_INSTRUMENTATION)
if (J9_ARE_ANY_BITS_SET(currentThread->jitCurrentRIFlags, J9_JIT_TOGGLE_RI_ON_TRANSITION)) {
PORT_ACCESS_FROM_VMC(currentThread);
j9ri_enable(NULL);
}
#endif /* J9VM_JIT_RUNTIME_INSTRUMENTATION */
}
static VMINLINE void
disableRuntimeInstrumentation(J9VMThread *currentThread)
{
#if defined(J9VM_JIT_RUNTIME_INSTRUMENTATION)
if (J9_ARE_ANY_BITS_SET(currentThread->jitCurrentRIFlags, J9_JIT_TOGGLE_RI_ON_TRANSITION)) {
PORT_ACCESS_FROM_VMC(currentThread);
j9ri_disable(NULL);
}
#endif /* J9VM_JIT_RUNTIME_INSTRUMENTATION */
}
};
#endif /* JITINTERFACE_HPP_ */