/* * Copyright (c) 2018, 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. */ /* Pseudo Java code: class CondyNestedResolution { public static Object bsm1arg(MethodHandles$Lookup p1, String p2, Object p3, Object p4) { System.out.println("In bsm1arg"); System.out.println(p4); return p4; } public static Object bsm2arg(MethodHandles$Lookup p1, String p2, Object p3, Object p4, Object p5) { System.out.println("In bsm2arg"); System.out.println(p4); System.out.println(p5); return p4; } public static Object bsm3arg(MethodHandles$Lookup p1, String p2, Object p3, Object p4, Object p5, Object p6) { System.out.println("In bsm3arg"); System.out.println(p4); System.out.println(p5); System.out.println(p6); return p4; } public static Object bsm4arg(MethodHandles$Lookup p1, String p2, Object p3, Object p4, Object p5, Object p6, Object p7) { System.out.println("In bsm4arg"); System.out.println(p4); System.out.println(p5); System.out.println(p6); System.out.println(p7); return p4; } public static void test_condy() { // The following condy of BSM#8 results in the invocation of bootstrap method bsm4arg with the following // parameters: // bsm4arg(bsm1arg("hello1"), // bsm1arg("hello2"), // bsm3arg(bsm1arg("hello4"), bsm2arg(bsm1arg("hello6"), (circular reference to BSM#8)), bsm1arg("hello5")), // bsm1arg("hello3")); // JVMS 5.4.3.6 Dynamically-Computed Constant and Call Site Resolution // Ensure that calls to bsm1arg("hello5") and bsm1arg("hello3") are never resolved due to the nested condy circularity // which results in a StackOverflowError. // ldc Dynamic BSM#8; } public static void main(String args[]) { CondyNestedResolution.test_condy(); } } BootstrapMethods: BSM0=invokestatic CondyNestedResolution.bsm1arg("hello1"); BSM1=invokestatic CondyNestedResolution.bsm1arg("hello2"); BSM2=invokestatic CondyNestedResolution.bsm1arg("hello4"); BSM3=invokestatic CondyNestedResolution.bsm1arg("hello6"); BSM4=invokestatic CondyNestedResolution.bsm2arg(BSM#3, BSM#8); BSM5=invokestatic CondyNestedResolution.bsm1arg("hello5"); BSM6=invokestatic CondyNestedResolution.bsm3arg(BSM#2, BSM#4, BSM#5); BSM7=invokestatic CondyNestedResolution.bsm1arg("hello3"); BSM8=invokestatic CondyNestedResolution.bsm4arg(BSM#0, BSM#1, BSM#6, BSM#7); Expected output: In bsm1arg hello1 In bsm1arg hello2 In bsm1arg hello4 In bsm1arg hello6 Exception in thread "main" java.lang.StackOverflowError at java.base/java.lang.invoke.MethodHandleNatives.copyOutBootstrapArguments(Native Method) */ class CondyNestedResolution { 0xCAFEBABE; 0; // minor version 55; // version [85] { // Constant Pool ; // first element is empty String #22; // #1 at 0x0A String #61; // #2 at 0x0D String #11; // #3 at 0x10 Dynamic 8s #12; // #4 at 0x13 Method #51 #10; // #5 at 0x18 Method #13 #39; // #6 at 0x1D Field #50 #81; // #7 at 0x22 Method #84 #45; // #8 at 0x27 Utf8 "java/io/PrintStream"; // #9 at 0x2C NameAndType #71 #47; // #10 at 0x42 Utf8 "In bsm1arg"; // #11 at 0x47 NameAndType #18 #17; // #12 at 0x54 class #9; // #13 at 0x59 Utf8 "SourceFile"; // #14 at 0x5C Utf8 "bsm3arg"; // #15 at 0x69 Utf8 "CondyNestedResolution.jasm"; // #16 at 0x73 Utf8 "Ljava/lang/String;"; // #17 at 0x90 Utf8 "name"; // #18 at 0xA5 Utf8 "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"; // #19 at 0xAC Utf8 "test_condy"; // #20 at 0x0144 NameAndType #15 #19; // #21 at 0x0151 Utf8 "In bsm2arg"; // #22 at 0x0156 Utf8 "Code"; // #23 at 0x0163 Utf8 "([Ljava/lang/String;)V"; // #24 at 0x016A Utf8 "bsm4arg"; // #25 at 0x0183 Utf8 "out"; // #26 at 0x018D NameAndType #69 #55; // #27 at 0x0193 Utf8 "BootstrapMethods"; // #28 at 0x0198 MethodHandle 6b #44; // #29 at 0x01AB Method #84 #63; // #30 at 0x01AF Utf8 "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"; // #31 at 0x01B4 Method #84 #27; // #32 at 0x0228 MethodHandle 6b #30; // #33 at 0x022D MethodHandle 6b #30; // #34 at 0x0231 MethodHandle 6b #30; // #35 at 0x0235 MethodHandle 6b #30; // #36 at 0x0239 MethodHandle 6b #30; // #37 at 0x023D MethodHandle 6b #30; // #38 at 0x0241 NameAndType #40 #41; // #39 at 0x0245 Utf8 "println"; // #40 at 0x024A Utf8 "(Ljava/lang/Object;)V"; // #41 at 0x0254 Utf8 "java/lang/Object"; // #42 at 0x026C Utf8 "java/lang/System"; // #43 at 0x027F Method #84 #21; // #44 at 0x0292 NameAndType #20 #47; // #45 at 0x0297 MethodHandle 6b #82; // #46 at 0x029C Utf8 "()V"; // #47 at 0x02A0 String #62; // #48 at 0x02A6 String #64; // #49 at 0x02A9 class #43; // #50 at 0x02AC class #42; // #51 at 0x02AF String #65; // #52 at 0x02B2 String #66; // #53 at 0x02B5 String #67; // #54 at 0x02B8 Utf8 "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"; // #55 at 0x02BB Utf8 "main"; // #56 at 0x0341 String #68; // #57 at 0x0348 MethodHandle 6b #32; // #58 at 0x034B Utf8 "bsm1arg"; // #59 at 0x034F NameAndType #25 #83; // #60 at 0x0359 Utf8 "In bsm4arg"; // #61 at 0x035E Utf8 "hello6"; // #62 at 0x036B NameAndType #59 #31; // #63 at 0x0374 Utf8 "hello5"; // #64 at 0x0379 Utf8 "hello4"; // #65 at 0x0382 Utf8 "hello3"; // #66 at 0x038B Utf8 "hello2"; // #67 at 0x0394 Utf8 "hello1"; // #68 at 0x039D Utf8 "bsm2arg"; // #69 at 0x03A6 Utf8 "Ljava/io/PrintStream;"; // #70 at 0x03B0 Utf8 ""; // #71 at 0x03C8 Utf8 "CondyNestedResolution"; // #72 at 0x03D1 Dynamic 7s #12; // #73 at 0x03E9 Dynamic 6s #12; // #74 at 0x03EE Dynamic 5s #12; // #75 at 0x03F3 Dynamic 4s #12; // #76 at 0x03F8 Dynamic 3s #12; // #77 at 0x03FD Dynamic 0s #12; // #78 at 0x0402 Dynamic 1s #12; // #79 at 0x0407 Dynamic 2s #12; // #80 at 0x040C NameAndType #26 #70; // #81 at 0x0411 Method #84 #60; // #82 at 0x0416 Utf8 "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"; // #83 at 0x041B class #72; // #84 at 0x04C5 } // Constant Pool 0x0000; // access [ ] #84;// this_cpx #51;// super_cpx [0] { // Interfaces } // Interfaces [0] { // fields } // fields [7] { // methods { // Member at 0x04D4 0x0001; // access #71; // name_cpx #47; // sig_cpx [1] { // Attributes Attr(#23, 17) { // Code at 0x04DC 1; // max_stack 1; // max_locals Bytes[5]{ 0x2AB70005B1; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member ; { // Member at 0x04F3 0x0009; // access #59; // name_cpx #31; // sig_cpx [1] { // Attributes Attr(#23, 29) { // Code at 0x04FB 4; // max_stack 4; // max_locals Bytes[17]{ 0xB200071203B60006; 0xB200072DB600062D; 0xB0; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member ; { // Member at 0x051E 0x0009; // access #69; // name_cpx #55; // sig_cpx [1] { // Attributes Attr(#23, 37) { // Code at 0x0526 8; // max_stack 8; // max_locals Bytes[25]{ 0xB200071201B60006; 0xB200072DB60006B2; 0x00071904B600062D; 0xB0; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member ; { // Member at 0x0551 0x0009; // access #15; // name_cpx #19; // sig_cpx [1] { // Attributes Attr(#23, 45) { // Code at 0x0559 19; // max_stack 19; // max_locals Bytes[33]{ 0xB200071202B60006; 0xB200072DB60006B2; 0x00071904B60006B2; 0x00071905B600062D; 0xB0; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member ; { // Member at 0x058C 0x0009; // access #25; // name_cpx #83; // sig_cpx [1] { // Attributes Attr(#23, 53) { // Code at 0x0594 19; // max_stack 19; // max_locals Bytes[41]{ 0xB200071202B60006; 0xB200072DB60006B2; 0x00071904B60006B2; 0x00071905B60006B2; 0x00071906B600062D; 0xB0; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member ; { // Member at 0x05CF 0x0009; // access #20; // name_cpx #47; // sig_cpx [1] { // Attributes Attr(#23, 15) { // Code at 0x05D7 12; // max_stack 12; // max_locals Bytes[3]{ 0x1204B1; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member ; { // Member at 0x05EC 0x0009; // access #56; // name_cpx #24; // sig_cpx [1] { // Attributes Attr(#23, 16) { // Code at 0x05F4 2; // max_stack 2; // max_locals Bytes[4]{ 0xB80008B1; } [0] { // Traps } // end Traps [0] { // Attributes } // Attributes } // end Code } // Attributes } // Member } // methods [2] { // Attributes Attr(#14, 2) { // SourceFile at 0x060C #16; } // end SourceFile ; Attr(#28, 68) { // BootstrapMethods at 0x0614 [9] { // bootstrap_methods { // bootstrap_method #36; // bootstrap_method_ref [1] { // bootstrap_arguments #57; // at 0x0622 } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #37; // bootstrap_method_ref [1] { // bootstrap_arguments #54; // at 0x0628 } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #38; // bootstrap_method_ref [1] { // bootstrap_arguments #52; // at 0x062E } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #35; // bootstrap_method_ref [1] { // bootstrap_arguments #48; // at 0x0634 } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #58; // bootstrap_method_ref [2] { // bootstrap_arguments #77; // at 0x063A #4; // at 0x063C } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #34; // bootstrap_method_ref [1] { // bootstrap_arguments #49; // at 0x0642 } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #29; // bootstrap_method_ref [3] { // bootstrap_arguments #80; // at 0x0648 #76; // at 0x064A #75; // at 0x064C } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #33; // bootstrap_method_ref [1] { // bootstrap_arguments #53; // at 0x0652 } // bootstrap_arguments } // bootstrap_method ; { // bootstrap_method #46; // bootstrap_method_ref [4] { // bootstrap_arguments #78; // at 0x0658 #79; // at 0x065A #74; // at 0x065C #73; // at 0x065E } // bootstrap_arguments } // bootstrap_method } } // end BootstrapMethods } // Attributes } // end class CondyNestedResolution