jdk8-mips64-public/hotspot: comparison src/share/vm/opto/optoreg.hpp

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+/*
+* Copyright (c) 2006, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#ifndef SHARE_VM_OPTO_OPTOREG_HPP
+#define SHARE_VM_OPTO_OPTOREG_HPP
+//------------------------------OptoReg----------------------------------------
+// We eventually need Registers for the Real World.  Registers are essentially
+// non-SSA names.  A Register is represented as a number.  Non-regular values
+// (e.g., Control, Memory, I/O) use the Special register.  The actual machine
+// registers (as described in the ADL file for a machine) start at zero.
+// Stack-slots (spill locations) start at the nest Chunk past the last machine
+// register.
+//
+// Note that stack spill-slots are treated as a very large register set.
+// They have all the correct properties for a Register: not aliased (unique
+// named).  There is some simple mapping from a stack-slot register number
+// to the actual location on the stack; this mapping depends on the calling
+// conventions and is described in the ADL.
+//
+// Note that Name is not enum. C++ standard defines that the range of enum
+// is the range of smallest bit-field that can represent all enumerators
+// declared in the enum. The result of assigning a value to enum is undefined
+// if the value is outside the enumeration's valid range. OptoReg::Name is
+// typedef'ed as int, because it needs to be able to represent spill-slots.
+//
+class OptoReg VALUE_OBJ_CLASS_SPEC {
+friend class C2Compiler;
+public:
+typedef int Name;
+enum {
+// Chunk 0
+Physical = AdlcVMDeps::Physical, // Start of physical regs
+// A few oddballs at the edge of the world
+Special = -2,               // All special (not allocated) values
+Bad = -1                    // Not a register
+};
+private:
+static const VMReg opto2vm[REG_COUNT];
+static Name vm2opto[ConcreteRegisterImpl::number_of_registers];
+public:
+// Stack pointer register
+static OptoReg::Name c_frame_pointer;
+// Increment a register number.  As in:
+//    "for ( OptoReg::Name i; i=Control; i = add(i,1) ) ..."
+static Name add( Name x, int y ) { return Name(x+y); }
+// (We would like to have an operator+ for RegName, but it is not
+// a class, so this would be illegal in C++.)
+static void dump(int, outputStream *st = tty);
+// Get the stack slot number of an OptoReg::Name
+static unsigned int reg2stack( OptoReg::Name r) {
+assert( r >= stack0(), " must be");
+return r - stack0();
+}
+// convert a stack slot number into an OptoReg::Name
+static OptoReg::Name stack2reg( int idx) {
+return Name(stack0() + idx);
+}
+static bool is_stack(Name n) {
+return n >= stack0();
+}
+static bool is_valid(Name n) {
+return (n != Bad);
+}
+static bool is_reg(Name n) {
+return  is_valid(n) && !is_stack(n);
+}
+static VMReg as_VMReg(OptoReg::Name n) {
+if (is_reg(n)) {
+// Must use table, it'd be nice if Bad was indexable...
+return opto2vm[n];
+} else {
+assert(!is_stack(n), "must un warp");
+return VMRegImpl::Bad();
+}
+}
+// Can un-warp a stack slot or convert a register or Bad
+static VMReg as_VMReg(OptoReg::Name n, int frame_size, int arg_count) {
+if (is_reg(n)) {
+// Must use table, it'd be nice if Bad was indexable...
+return opto2vm[n];
+} else if (is_stack(n)) {
+int stack_slot = reg2stack(n);
+if (stack_slot < arg_count) {
+return VMRegImpl::stack2reg(stack_slot + frame_size);
+}
+return VMRegImpl::stack2reg(stack_slot - arg_count);
+// return return VMRegImpl::stack2reg(reg2stack(OptoReg::add(n, -arg_count)));
+} else {
+return VMRegImpl::Bad();
+}
+}
+static OptoReg::Name as_OptoReg(VMReg r) {
+if (r->is_stack()) {
+assert(false, "must warp");
+return stack2reg(r->reg2stack());
+} else if (r->is_valid()) {
+// Must use table, it'd be nice if Bad was indexable...
+return vm2opto[r->value()];
+} else {
+return Bad;
+}
+}
+static OptoReg::Name stack0() {
+return VMRegImpl::stack0->value();
+}
+static const char* regname(OptoReg::Name n) {
+return as_VMReg(n)->name();
+}
+};
+//---------------------------OptoRegPair-------------------------------------------
+// Pairs of 32-bit registers for the allocator.
+// This is a very similar class to VMRegPair. C2 only interfaces with VMRegPair
+// via the calling convention code which is shared between the compilers.
+// Since C2 uses OptoRegs for register allocation it is more efficient to use
+// VMRegPair internally for nodes that can contain a pair of OptoRegs rather
+// than use VMRegPair and continually be converting back and forth. So normally
+// C2 will take in a VMRegPair from the calling convention code and immediately
+// convert them to an OptoRegPair and stay in the OptoReg world. The only over
+// conversion between OptoRegs and VMRegs is for debug info and oopMaps. This
+// is not a high bandwidth spot and so it is not an issue.
+// Note that onde other consequence of staying in the OptoReg world with OptoRegPairs
+// is that there are "physical" OptoRegs that are not representable in the VMReg
+// world, notably flags. [ But by design there is "space" in the VMReg world
+// for such registers they just may not be concrete ]. So if we were to use VMRegPair
+// then the VMReg world would have to have a representation for these registers
+// so that a OptoReg->VMReg->OptoReg would reproduce ther original OptoReg. As it
+// stands if you convert a flag (condition code) to a VMReg you will get VMRegImpl::Bad
+// and converting that will return OptoReg::Bad losing the identity of the OptoReg.
+class OptoRegPair {
+friend class VMStructs;
+private:
+short _second;
+short _first;
+public:
+void set_bad (                   ) { _second = OptoReg::Bad; _first = OptoReg::Bad; }
+void set1    ( OptoReg::Name n  ) { _second = OptoReg::Bad; _first = n; }
+void set2    ( OptoReg::Name n  ) { _second = n + 1;       _first = n; }
+void set_pair( OptoReg::Name second, OptoReg::Name first    ) { _second= second;    _first= first; }
+void set_ptr ( OptoReg::Name ptr ) {
+#ifdef _LP64
+_second = ptr+1;
+#else
+_second = OptoReg::Bad;
+#endif
+_first = ptr;
+}
+OptoReg::Name second() const { return _second; }
+OptoReg::Name first() const { return _first; }
+OptoRegPair(OptoReg::Name second, OptoReg::Name first) {  _second = second; _first = first; }
+OptoRegPair(OptoReg::Name f) { _second = OptoReg::Bad; _first = f; }
+OptoRegPair() { _second = OptoReg::Bad; _first = OptoReg::Bad; }
+};
+#endif // SHARE_VM_OPTO_OPTOREG_HPP

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comparison: src/share/vm/opto/optoreg.hpp

src/share/vm/opto/optoreg.hpp