6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.code; 24 25 import java.util.Arrays; 26 27 /** 28 * A collection of register attributes. The specific attribute values for a register may be local to 29 * a compilation context. For example, a {@link RegisterConfig} in use during a compilation will 30 * determine which registers are callee saved. 31 */ 32 public class RegisterAttributes { 33 34 private final boolean callerSave; 35 private final boolean calleeSave; 36 private final boolean allocatable; 37 38 public RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) { 39 this.callerSave = isCallerSave; 40 this.calleeSave = isCalleeSave; 41 this.allocatable = isAllocatable; 42 } 43 44 public static final RegisterAttributes NONE = new RegisterAttributes(false, false, false); 45 46 /** 47 * Creates a map from register {@linkplain Register#number numbers} to register 48 * {@linkplain RegisterAttributes attributes} for a given register configuration and set of 49 * registers. 50 * 51 * @param registerConfig a register configuration 52 * @param registers a set of registers 53 * @return an array whose length is the max register number in {@code registers} plus 1. An 54 * element at index i holds the attributes of the register whose number is i. 55 */ 56 public static RegisterAttributes[] createMap(RegisterConfig registerConfig, Register[] registers) { 57 RegisterAttributes[] map = new RegisterAttributes[registers.length]; 58 for (Register reg : registers) { 59 if (reg != null) { 60 Register[] csr = registerConfig.getCalleeSaveRegisters(); 61 RegisterAttributes attr = new RegisterAttributes(Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg), csr == null ? false : Arrays.asList(csr).contains(reg), 62 Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg)); 63 if (map.length <= reg.number) { 64 map = Arrays.copyOf(map, reg.number + 1); 65 } 66 map[reg.number] = attr; 67 } 68 } 69 for (int i = 0; i < map.length; i++) { 70 if (map[i] == null) { 71 map[i] = NONE; 72 } 73 } 74 return map; 75 } 76 77 /** 78 * @return Denotes a register that is available for use by a register allocator. 79 */ 80 public boolean isAllocatable() { 81 return allocatable; 82 } 83 84 /** 85 * @return Denotes a register whose value preservation (if required) across a call is the 86 * responsibility of the callee. 87 */ 88 public boolean isCalleeSave() { 89 return calleeSave; 90 } 91 92 /** 93 * @return Denotes a register whose value preservation (if required) across a call is the 94 * responsibility of the caller. 95 */ 96 public boolean isCallerSave() { 97 return callerSave; 98 } 99 } | 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.code; 24 25 import java.util.Arrays; 26 import java.util.Collections; 27 import java.util.List; 28 29 /** 30 * A collection of register attributes. The specific attribute values for a register may be local to 31 * a compilation context. For example, a {@link RegisterConfig} in use during a compilation will 32 * determine which registers are callee saved. 33 */ 34 public class RegisterAttributes { 35 36 private final boolean callerSave; 37 private final boolean calleeSave; 38 private final boolean allocatable; 39 40 public RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) { 41 this.callerSave = isCallerSave; 42 this.calleeSave = isCalleeSave; 43 this.allocatable = isAllocatable; 44 } 45 46 public static final RegisterAttributes NONE = new RegisterAttributes(false, false, false); 47 48 /** 49 * Creates a map from register {@linkplain Register#number numbers} to register 50 * {@linkplain RegisterAttributes attributes} for a given register configuration and set of 51 * registers. 52 * 53 * @param registerConfig a register configuration 54 * @param registers a set of registers 55 * @return an array whose length is the max register number in {@code registers} plus 1. An 56 * element at index i holds the attributes of the register whose number is i. 57 */ 58 public static RegisterAttributes[] createMap(RegisterConfig registerConfig, RegisterArray registers) { 59 RegisterAttributes[] map = new RegisterAttributes[registers.size()]; 60 List<Register> callerSaveRegisters = registerConfig.getCallerSaveRegisters().asList(); 61 List<Register> calleeSaveRegisters = registerConfig.getCalleeSaveRegisters() == null ? Collections.emptyList() : registerConfig.getCalleeSaveRegisters().asList(); 62 List<Register> allocatableRegisters = registerConfig.getAllocatableRegisters().asList(); 63 for (Register reg : registers) { 64 if (reg != null) { 65 RegisterAttributes attr = new RegisterAttributes(callerSaveRegisters.contains(reg), calleeSaveRegisters.contains(reg), allocatableRegisters.contains(reg)); 66 if (map.length <= reg.number) { 67 map = Arrays.copyOf(map, reg.number + 1); 68 } 69 map[reg.number] = attr; 70 } 71 } 72 for (int i = 0; i < map.length; i++) { 73 if (map[i] == null) { 74 map[i] = NONE; 75 } 76 } 77 return map; 78 } 79 80 /** 81 * @return {@code true} if a register is available for use by a register allocator otherwise 82 * {@code false} 83 */ 84 public boolean isAllocatable() { 85 return allocatable; 86 } 87 88 /** 89 * @return {@code true} if a register whose value preservation (if required) across a call is 90 * the responsibility of the callee otherwise {@code false} 91 */ 92 public boolean isCalleeSave() { 93 return calleeSave; 94 } 95 96 /** 97 * @return {@code true} if a register whose value preservation (if required) across a call is 98 * the responsibility of the caller otherwise {@code false} 99 */ 100 public boolean isCallerSave() { 101 return callerSave; 102 } 103 } |