--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cpu/x86/vm/jniFastGetField_x86_32.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,356 @@
+/*
+ * Copyright 2004-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_jniFastGetField_x86_32.cpp.incl"
+
+#define __ masm->
+
+#define BUFFER_SIZE 30
+
+#ifdef _WINDOWS
+GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;
+GetByteField_t    JNI_FastGetField::jni_fast_GetByteField_fp;
+GetCharField_t    JNI_FastGetField::jni_fast_GetCharField_fp;
+GetShortField_t   JNI_FastGetField::jni_fast_GetShortField_fp;
+GetIntField_t     JNI_FastGetField::jni_fast_GetIntField_fp;
+GetLongField_t    JNI_FastGetField::jni_fast_GetLongField_fp;
+GetFloatField_t   JNI_FastGetField::jni_fast_GetFloatField_fp;
+GetDoubleField_t  JNI_FastGetField::jni_fast_GetDoubleField_fp;
+#endif
+
+// Instead of issuing lfence for LoadLoad barrier, we create data dependency
+// between loads, which is much more efficient than lfence.
+
+address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
+  const char *name;
+  switch (type) {
+    case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
+    case T_BYTE:    name = "jni_fast_GetByteField";    break;
+    case T_CHAR:    name = "jni_fast_GetCharField";    break;
+    case T_SHORT:   name = "jni_fast_GetShortField";   break;
+    case T_INT:     name = "jni_fast_GetIntField";     break;
+    default:        ShouldNotReachHere();
+  }
+  ResourceMark rm;
+  BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE*wordSize);
+  address fast_entry = b->instructions_begin();
+  CodeBuffer cbuf(fast_entry, b->instructions_size());
+  MacroAssembler* masm = new MacroAssembler(&cbuf);
+
+  Label slow;
+
+  // stack layout:    offset from rsp (in words):
+  //  return pc        0
+  //  jni env          1
+  //  obj              2
+  //  jfieldID         3
+
+  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
+  __ mov32 (rcx, counter);
+  __ testb (rcx, 1);
+  __ jcc (Assembler::notZero, slow);
+  if (os::is_MP()) {
+    __ movl (rax, rcx);
+    __ andl (rax, 1);                         // rax, must end up 0
+    __ movl (rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
+                                              // obj, notice rax, is 0.
+                                              // rdx is data dependent on rcx.
+  } else {
+    __ movl (rdx, Address(rsp, 2*wordSize));  // obj
+  }
+  __ movl (rax, Address(rsp, 3*wordSize));  // jfieldID
+  __ movl (rdx, Address(rdx, 0));           // *obj
+  __ shrl (rax, 2);                         // offset
+
+  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
+  speculative_load_pclist[count] = __ pc();
+  switch (type) {
+    case T_BOOLEAN: __ movzxb (rax, Address(rdx, rax, Address::times_1)); break;
+    case T_BYTE:    __ movsxb (rax, Address(rdx, rax, Address::times_1)); break;
+    case T_CHAR:    __ movzxw (rax, Address(rdx, rax, Address::times_1)); break;
+    case T_SHORT:   __ movsxw (rax, Address(rdx, rax, Address::times_1)); break;
+    case T_INT:     __ movl   (rax, Address(rdx, rax, Address::times_1)); break;
+    default:        ShouldNotReachHere();
+  }
+
+  Address ca1;
+  if (os::is_MP()) {
+    __ lea(rdx, counter);
+    __ xorl(rdx, rax);
+    __ xorl(rdx, rax);
+    __ cmp32(rcx, Address(rdx, 0));
+    // ca1 is the same as ca because
+    // rax, ^ counter_addr ^ rax, = address
+    // ca1 is data dependent on rax,.
+  } else {
+    __ cmp32(rcx, counter);
+  }
+  __ jcc (Assembler::notEqual, slow);
+
+#ifndef _WINDOWS
+  __ ret (0);
+#else
+  // __stdcall calling convention
+  __ ret (3*wordSize);
+#endif
+
+  slowcase_entry_pclist[count++] = __ pc();
+  __ bind (slow);
+  address slow_case_addr;
+  switch (type) {
+    case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
+    case T_BYTE:    slow_case_addr = jni_GetByteField_addr();    break;
+    case T_CHAR:    slow_case_addr = jni_GetCharField_addr();    break;
+    case T_SHORT:   slow_case_addr = jni_GetShortField_addr();   break;
+    case T_INT:     slow_case_addr = jni_GetIntField_addr();
+  }
+  // tail call
+  __ jump (ExternalAddress(slow_case_addr));
+
+  __ flush ();
+
+#ifndef _WINDOWS
+  return fast_entry;
+#else
+  switch (type) {
+    case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t)fast_entry; break;
+    case T_BYTE:    jni_fast_GetByteField_fp = (GetByteField_t)fast_entry; break;
+    case T_CHAR:    jni_fast_GetCharField_fp = (GetCharField_t)fast_entry; break;
+    case T_SHORT:   jni_fast_GetShortField_fp = (GetShortField_t)fast_entry; break;
+    case T_INT:     jni_fast_GetIntField_fp = (GetIntField_t)fast_entry;
+  }
+  return os::win32::fast_jni_accessor_wrapper(type);
+#endif
+}
+
+address JNI_FastGetField::generate_fast_get_boolean_field() {
+  return generate_fast_get_int_field0(T_BOOLEAN);
+}
+
+address JNI_FastGetField::generate_fast_get_byte_field() {
+  return generate_fast_get_int_field0(T_BYTE);
+}
+
+address JNI_FastGetField::generate_fast_get_char_field() {
+  return generate_fast_get_int_field0(T_CHAR);
+}
+
+address JNI_FastGetField::generate_fast_get_short_field() {
+  return generate_fast_get_int_field0(T_SHORT);
+}
+
+address JNI_FastGetField::generate_fast_get_int_field() {
+  return generate_fast_get_int_field0(T_INT);
+}
+
+address JNI_FastGetField::generate_fast_get_long_field() {
+  const char *name = "jni_fast_GetLongField";
+  ResourceMark rm;
+  BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE*wordSize);
+  address fast_entry = b->instructions_begin();
+  CodeBuffer cbuf(fast_entry, b->instructions_size());
+  MacroAssembler* masm = new MacroAssembler(&cbuf);
+
+  Label slow;
+
+  // stack layout:    offset from rsp (in words):
+  //  old rsi          0
+  //  return pc        1
+  //  jni env          2
+  //  obj              3
+  //  jfieldID         4
+
+  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
+
+  __ pushl (rsi);
+  __ mov32 (rcx, counter);
+  __ testb (rcx, 1);
+  __ jcc (Assembler::notZero, slow);
+  if (os::is_MP()) {
+    __ movl (rax, rcx);
+    __ andl (rax, 1);                         // rax, must end up 0
+    __ movl (rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
+                                              // obj, notice rax, is 0.
+                                              // rdx is data dependent on rcx.
+  } else {
+    __ movl (rdx, Address(rsp, 3*wordSize));  // obj
+  }
+  __ movl (rsi, Address(rsp, 4*wordSize));  // jfieldID
+  __ movl (rdx, Address(rdx, 0));           // *obj
+  __ shrl (rsi, 2);                         // offset
+
+  assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
+  speculative_load_pclist[count++] = __ pc();
+  __ movl (rax, Address(rdx, rsi, Address::times_1));
+  speculative_load_pclist[count] = __ pc();
+  __ movl (rdx, Address(rdx, rsi, Address::times_1, 4));
+
+  if (os::is_MP()) {
+    __ lea  (rsi, counter);
+    __ xorl (rsi, rdx);
+    __ xorl (rsi, rax);
+    __ xorl (rsi, rdx);
+    __ xorl (rsi, rax);
+    __ cmp32(rcx, Address(rsi, 0));
+    // ca1 is the same as ca because
+    // rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
+    // ca1 is data dependent on both rax, and rdx.
+  } else {
+    __ cmp32(rcx, counter);
+  }
+  __ jcc (Assembler::notEqual, slow);
+
+  __ popl (rsi);
+
+#ifndef _WINDOWS
+  __ ret (0);
+#else
+  // __stdcall calling convention
+  __ ret (3*wordSize);
+#endif
+
+  slowcase_entry_pclist[count-1] = __ pc();
+  slowcase_entry_pclist[count++] = __ pc();
+  __ bind (slow);
+  __ popl (rsi);
+  address slow_case_addr = jni_GetLongField_addr();;
+  // tail call
+  __ jump (ExternalAddress(slow_case_addr));
+
+  __ flush ();
+
+#ifndef _WINDOWS
+  return fast_entry;
+#else
+  jni_fast_GetLongField_fp = (GetLongField_t)fast_entry;
+  return os::win32::fast_jni_accessor_wrapper(T_LONG);
+#endif
+}
+
+address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
+  const char *name;
+  switch (type) {
+    case T_FLOAT:  name = "jni_fast_GetFloatField";  break;
+    case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
+    default:       ShouldNotReachHere();
+  }
+  ResourceMark rm;
+  BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE*wordSize);
+  address fast_entry = b->instructions_begin();
+  CodeBuffer cbuf(fast_entry, b->instructions_size());
+  MacroAssembler* masm = new MacroAssembler(&cbuf);
+
+  Label slow_with_pop, slow;
+
+  // stack layout:    offset from rsp (in words):
+  //  return pc        0
+  //  jni env          1
+  //  obj              2
+  //  jfieldID         3
+
+  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
+
+  __ mov32 (rcx, counter);
+  __ testb (rcx, 1);
+  __ jcc (Assembler::notZero, slow);
+  if (os::is_MP()) {
+    __ movl (rax, rcx);
+    __ andl (rax, 1);                         // rax, must end up 0
+    __ movl (rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
+                                              // obj, notice rax, is 0.
+                                              // rdx is data dependent on rcx.
+  } else {
+    __ movl (rdx, Address(rsp, 2*wordSize)); // obj
+  }
+  __ movl (rax, Address(rsp, 3*wordSize));  // jfieldID
+  __ movl (rdx, Address(rdx, 0));           // *obj
+  __ shrl (rax, 2);                         // offset
+
+  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
+  speculative_load_pclist[count] = __ pc();
+  switch (type) {
+    case T_FLOAT:  __ fld_s (Address(rdx, rax, Address::times_1)); break;
+    case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
+    default:       ShouldNotReachHere();
+  }
+
+  Address ca1;
+  if (os::is_MP()) {
+    __ fst_s (Address(rsp, -4));
+    __ lea(rdx, counter);
+    __ movl (rax, Address(rsp, -4));
+    __ xorl(rdx, rax);
+    __ xorl(rdx, rax);
+    __ cmp32(rcx, Address(rdx, 0));
+                                          // rax, ^ counter_addr ^ rax, = address
+                                          // ca1 is data dependent on the field
+                                          // access.
+  } else {
+    __ cmp32(rcx, counter);
+  }
+  __ jcc (Assembler::notEqual, slow_with_pop);
+
+#ifndef _WINDOWS
+  __ ret (0);
+#else
+  // __stdcall calling convention
+  __ ret (3*wordSize);
+#endif
+
+  __ bind (slow_with_pop);
+  // invalid load. pop FPU stack.
+  __ fstp_d (0);
+
+  slowcase_entry_pclist[count++] = __ pc();
+  __ bind (slow);
+  address slow_case_addr;
+  switch (type) {
+    case T_FLOAT:  slow_case_addr = jni_GetFloatField_addr();  break;
+    case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
+    default:       ShouldNotReachHere();
+  }
+  // tail call
+  __ jump (ExternalAddress(slow_case_addr));
+
+  __ flush ();
+
+#ifndef _WINDOWS
+  return fast_entry;
+#else
+  switch (type) {
+    case T_FLOAT:  jni_fast_GetFloatField_fp = (GetFloatField_t)fast_entry; break;
+    case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t)fast_entry;
+  }
+  return os::win32::fast_jni_accessor_wrapper(type);
+#endif
+}
+
+address JNI_FastGetField::generate_fast_get_float_field() {
+  return generate_fast_get_float_field0(T_FLOAT);
+}
+
+address JNI_FastGetField::generate_fast_get_double_field() {
+  return generate_fast_get_float_field0(T_DOUBLE);
+}