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Subject: Fix compilation issues with musl libc
Upstream: No
Author: The portola team at https://openjdk.java.net/projects/portola/
        With modifications by Simon Frankenberger <simon-alpine@fraho.eu>

This giant patch makes it possible to compile openjdk with musl libc.
The base was taken from a diff with the portola project and adjusted for latest musl libc.

This patch contains mainly code from the portola project.
Adopted, enhanced and fixed so that it actually compiles with alpine.

--- old/make/ReleaseFile.gmk
+++ new/make/ReleaseFile.gmk
@@ -53,6 +53,7 @@
   $(call info-file-item, "JAVA_VERSION_DATE", "$(VERSION_DATE)")
   $(call info-file-item, "OS_NAME", "$(RELEASE_FILE_OS_NAME)")
   $(call info-file-item, "OS_ARCH", "$(RELEASE_FILE_OS_ARCH)")
+  $(call info-file-item, "LIBC", "musl")
 endef
 
 # Param 1 - The file containing the MODULES list
--- old/make/hotspot/lib/CompileJvm.gmk
+++ new/make/hotspot/lib/CompileJvm.gmk
@@ -68,6 +68,7 @@
     -DHOTSPOT_BUILD_USER='"$(USERNAME)"' \
     -DHOTSPOT_VM_DISTRO='"$(HOTSPOT_VM_DISTRO)"' \
     -DCPU='"$(OPENJDK_TARGET_CPU_VM_VERSION)"' \
+    -DLIBC='"musl"' \
     #
 
 ifneq ($(HOTSPOT_BUILD_TIME), )
--- old/make/modules/java.base/lib/CoreLibraries.gmk
+++ new/make/modules/java.base/lib/CoreLibraries.gmk
@@ -183,6 +183,7 @@
 endif
 
 LIBJLI_CFLAGS += $(LIBZ_CFLAGS)
+LIBJLI_CFLAGS += -DLIBC=\"musl\"
 
 ifneq ($(USE_EXTERNAL_LIBZ), true)
   LIBJLI_EXTRA_FILES += \
--- old/src/hotspot/os/linux/os_linux.cpp
+++ new/src/hotspot/os/linux/os_linux.cpp
@@ -103,7 +103,6 @@
 # include <string.h>
 # include <syscall.h>
 # include <sys/sysinfo.h>
-# include <gnu/libc-version.h>
 # include <sys/ipc.h>
 # include <sys/shm.h>
 # include <link.h>
@@ -600,6 +599,11 @@
 // detecting pthread library
 
 void os::Linux::libpthread_init() {
+#if !defined(__GLIBC__) && !defined(__UCLIBC__)
+  // Hard code Alpine Linux supported musl compatible settings
+  os::Linux::set_glibc_version("glibc 2.9");
+  os::Linux::set_libpthread_version("NPTL");
+#else
   // Save glibc and pthread version strings.
 #if !defined(_CS_GNU_LIBC_VERSION) || \
     !defined(_CS_GNU_LIBPTHREAD_VERSION)
@@ -617,6 +621,7 @@
   str = (char *)malloc(n, mtInternal);
   confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n);
   os::Linux::set_libpthread_version(str);
+#endif
 }
 
 /////////////////////////////////////////////////////////////////////////////
@@ -3195,20 +3200,36 @@
 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { }
 extern "C" JNIEXPORT void numa_error(char *where) { }
 
+static void* dlvsym_if_available(void* handle, const char* name, const char* version) {
+  typedef void* (*dlvsym_func_type)(void* handle, const char* name, const char* version);
+  static dlvsym_func_type dlvsym_func;
+  static bool initialized = false;
+
+  if (!initialized) {
+    dlvsym_func = (dlvsym_func_type)dlsym(RTLD_NEXT, "dlvsym");
+    initialized = true;
+  }
+
+  if (dlvsym_func != NULL) {
+    void *f = dlvsym_func(handle, name, version);
+    if (f != NULL) {
+      return f;
+    }
+  }
+
+  return dlsym(handle, name);
+}
+
 // Handle request to load libnuma symbol version 1.1 (API v1). If it fails
 // load symbol from base version instead.
 void* os::Linux::libnuma_dlsym(void* handle, const char *name) {
-  void *f = dlvsym(handle, name, "libnuma_1.1");
-  if (f == NULL) {
-    f = dlsym(handle, name);
-  }
-  return f;
+  return dlvsym_if_available(handle, name, "libnuma_1.1");
 }
 
 // Handle request to load libnuma symbol version 1.2 (API v2) only.
 // Return NULL if the symbol is not defined in this particular version.
 void* os::Linux::libnuma_v2_dlsym(void* handle, const char* name) {
-  return dlvsym(handle, name, "libnuma_1.2");
+  return dlvsym_if_available(handle, name, "libnuma_1.2");
 }
 
 bool os::Linux::libnuma_init() {
--- old/src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp
+++ new/src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp
@@ -76,9 +76,6 @@
 # include <pwd.h>
 # include <poll.h>
 # include <ucontext.h>
-#ifndef AMD64
-# include <fpu_control.h>
-#endif
 
 #ifdef AMD64
 #define REG_SP REG_RSP
--- old/src/hotspot/share/gc/shared/genCollectedHeap.cpp
+++ new/src/hotspot/share/gc/shared/genCollectedHeap.cpp
@@ -1121,7 +1121,7 @@
 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) {
   bool first = true;
   size_t min_size = 0;   // "first" makes this conceptually infinite.
-  ScratchBlock **smallest_ptr, *smallest;
+  ScratchBlock **smallest_ptr = NULL, *smallest;
   ScratchBlock  *cur = *prev_ptr;
   while (cur) {
     assert(*prev_ptr == cur, "just checking");
--- old/src/hotspot/share/utilities/globalDefinitions_gcc.hpp
+++ new/src/hotspot/share/utilities/globalDefinitions_gcc.hpp
@@ -112,7 +112,7 @@
 #if defined(__APPLE__)
 inline int g_isnan(double f) { return isnan(f); }
 #elif defined(LINUX) || defined(_ALLBSD_SOURCE)
-inline int g_isnan(float  f) { return isnanf(f); }
+inline int g_isnan(float  f) { return isnan(f); }
 inline int g_isnan(double f) { return isnan(f); }
 #else
 #error "missing platform-specific definition here"
--- old/src/java.base/linux/native/libnet/linux_close.c
+++ new/src/java.base/linux/native/libnet/linux_close.c
@@ -60,7 +60,7 @@
 /*
  * Signal to unblock thread
  */
-static int sigWakeup = (__SIGRTMAX - 2);
+static int sigWakeup;
 
 /*
  * fdTable holds one entry per file descriptor, up to a certain
@@ -149,6 +149,7 @@
     /*
      * Setup the signal handler
      */
+    sigWakeup = SIGRTMAX - 2;
     sa.sa_handler = sig_wakeup;
     sa.sa_flags   = 0;
     sigemptyset(&sa.sa_mask);
--- old/src/java.base/unix/native/libjava/childproc.c
+++ new/src/java.base/unix/native/libjava/childproc.c
@@ -236,7 +236,13 @@
 {
     if (envp == NULL || (char **) envp == environ) {
         execvp(file, (char **) argv);
-        return;
+        // ENOEXEC indicates that the file header was not recognized. The musl C
+        // library does not implement the fallback to /bin/sh for that case, so fall
+        // through to the code below which implements that fallback using
+        // execve_with_shell_fallback.
+        if (errno != ENOEXEC) {
+            return;
+        }
     }
 
     if (*file == '\0') {
--- old/src/java.base/unix/native/libjava/jdk_util_md.h
+++ new/src/java.base/unix/native/libjava/jdk_util_md.h
@@ -33,7 +33,7 @@
 #define ISNAND(d) isnan(d)
 #elif defined(__linux__) || defined(_ALLBSD_SOURCE)
 #include <math.h>
-#define ISNANF(f) isnanf(f)
+#define ISNANF(f) isnan(f)
 #define ISNAND(d) isnan(d)
 #elif defined(_AIX)
 #include <math.h>
--- old/src/java.base/unix/native/libjli/java_md.c
+++ new/src/java.base/unix/native/libjli/java_md.c
@@ -230,6 +230,39 @@
     char *dmllp = NULL;
     char *p; /* a utility pointer */
 
+#ifdef __linux
+#ifndef LIBC
+#error "LIBC not set"
+#endif
+
+    if (strcmp(LIBC, "musl") == 0) {
+      /*
+       * The musl library loader requires LD_LIBRARY_PATH to be set in
+       * order to correctly resolve the dependency libjava.so has on libjvm.so.
+       *
+       * Specifically, it differs from glibc in the sense that even if
+       * libjvm.so has already been loaded it will not be considered a
+       * candidate for resolving the dependency unless the *full* path
+       * of the already loaded library matches the dependency being loaded.
+       *
+       * libjvm.so is being loaded by the launcher using a long path to
+       * dlopen, not just the basename of the library. Typically this
+       * is something like "../lib/server/libjvm.so". However, if/when
+       * libjvm.so later tries to dlopen libjava.so (which it does in
+       * order to get access to a few functions implemented in
+       * libjava.so) the musl loader will, as part of loading
+       * dependent libraries, try to load libjvm.so using only its
+       * basename "libjvm.so". Since this does not match the longer
+       * path path it was first loaded with, the already loaded
+       * library is not considered a candidate, and the loader will
+       * instead look for libjvm.so elsewhere. If it's not in
+       * LD_LIBRARY_PATH the dependency load will fail, and libjava.so
+       * will therefore fail as well.
+       */
+      return JNI_TRUE;
+    }
+#endif
+
 #ifdef AIX
     /* We always have to set the LIBPATH on AIX because ld doesn't support $ORIGIN. */
     return JNI_TRUE;
--- old/src/java.base/unix/native/libnio/ch/NativeThread.c
+++ new/src/java.base/unix/native/libnio/ch/NativeThread.c
@@ -36,7 +36,7 @@
 #ifdef __linux__
   #include <pthread.h>
   /* Also defined in net/linux_close.c */
-  #define INTERRUPT_SIGNAL (__SIGRTMAX - 2)
+  #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
 #elif defined(_AIX)
   #include <pthread.h>
   /* Also defined in net/aix_close.c */
--- old/src/jdk.jdwp.agent/share/native/libjdwp/util.h
+++ new/src/jdk.jdwp.agent/share/native/libjdwp/util.h
@@ -35,15 +35,15 @@
 #ifdef DEBUG
     /* Just to make sure these interfaces are not used here. */
     #undef free
-    #define free(p) Do not use this interface.
+    #define free do_not_use_this_interface_free
     #undef malloc
-    #define malloc(p) Do not use this interface.
+    #define malloc do_not_use_this_interface_malloc
     #undef calloc
-    #define calloc(p) Do not use this interface.
+    #define calloc do_not_use_this_interface_calloc
     #undef realloc
-    #define realloc(p) Do not use this interface.
+    #define realloc do_not_use_this_interface_realloc
     #undef strdup
-    #define strdup(p) Do not use this interface.
+    #define strdup do_not_use_this_interface_strdup
 #endif
 
 #include "log_messages.h"
--- old/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c
+++ new/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c
@@ -33,6 +33,7 @@
 
 #include <assert.h>
 #include <jni.h>
+#include <jvm.h>
 #include <alloca.h>
 #include <signal.h>
 #include <string.h>
@@ -91,6 +92,20 @@
   }
 }
 
+int get_java_stacksize () {
+  size_t stacksize;
+  pthread_attr_t attr;
+  JDK1_1InitArgs jdk_args;
+
+  jdk_args.version = JNI_VERSION_1_1;
+  JNI_GetDefaultJavaVMInitArgs(&jdk_args);
+  if (jdk_args.javaStackSize <= 0) {
+    fprintf(stderr, "Test ERROR. Can't get a valid value for the default stacksize.\n");
+    exit(7);
+  }
+  return jdk_args.javaStackSize;
+}
+
 void *run_java_overflow (void *p) {
   JNIEnv *env;
   jclass class_id;
@@ -258,13 +273,19 @@
     exit(7);
   }
 
+  int stack_size = get_java_stacksize();
   pthread_t thr;
+  pthread_attr_t thread_attr;
 
+  pthread_attr_init(&thread_attr);
+  pthread_attr_setstacksize(&thread_attr, stack_size);
+
   if (argc > 1 && strcmp(argv[1], "test_java_overflow") == 0) {
     printf("\nTesting JAVA_OVERFLOW\n");
 
     printf("Testing stack guard page behaviour for other thread\n");
-    pthread_create (&thr, NULL, run_java_overflow, NULL);
+
+    pthread_create (&thr, &thread_attr, run_java_overflow, NULL);
     pthread_join (thr, NULL);
 
     printf("Testing stack guard page behaviour for initial thread\n");
@@ -277,7 +298,7 @@
     printf("\nTesting NATIVE_OVERFLOW\n");
 
     printf("Testing stack guard page behaviour for other thread\n");
-    pthread_create (&thr, NULL, run_native_overflow, NULL);
+    pthread_create (&thr, &thread_attr, run_native_overflow, NULL);
     pthread_join (thr, NULL);
 
     printf("Testing stack guard page behaviour for initial thread\n");
--- old/test/jdk/java/lang/ProcessBuilder/Basic.java
+++ new/test/jdk/java/lang/ProcessBuilder/Basic.java
@@ -400,8 +400,8 @@
                 if (failed != 0) throw new Error("null PATH");
             } else if (action.equals("PATH search algorithm")) {
                 equal(System.getenv("PATH"), "dir1:dir2:");
-                check(new File("/bin/true").exists());
-                check(new File("/bin/false").exists());
+                check(new File(TrueExe.path()).exists());
+                check(new File(FalseExe.path()).exists());
                 String[] cmd = {"prog"};
                 ProcessBuilder pb1 = new ProcessBuilder(cmd);
                 ProcessBuilder pb2 = new ProcessBuilder(cmd);
@@ -442,13 +442,13 @@
                         checkPermissionDenied(pb);
 
                         // continue searching if EACCES
-                        copy("/bin/true", "dir2/prog");
+                        copy(TrueExe.path(), "dir2/prog");
                         equal(run(pb).exitValue(), True.exitValue());
                         new File("dir1/prog").delete();
                         new File("dir2/prog").delete();
 
                         new File("dir2/prog").mkdirs();
-                        copy("/bin/true", "dir1/prog");
+                        copy(TrueExe.path(), "dir1/prog");
                         equal(run(pb).exitValue(), True.exitValue());
 
                         // Check empty PATH component means current directory.
@@ -464,10 +464,10 @@
                             pb.command(command);
                             File prog = new File("./prog");
                             // "Normal" binaries
-                            copy("/bin/true", "./prog");
+                            copy(TrueExe.path(), "./prog");
                             equal(run(pb).exitValue(),
                                   True.exitValue());
-                            copy("/bin/false", "./prog");
+                            copy(FalseExe.path(), "./prog");
                             equal(run(pb).exitValue(),
                                   False.exitValue());
                             prog.delete();
@@ -522,12 +522,12 @@
                         new File("dir2/prog").delete();
                         new File("prog").delete();
                         new File("dir3").mkdirs();
-                        copy("/bin/true", "dir1/prog");
-                        copy("/bin/false", "dir3/prog");
+                        copy(TrueExe.path(), "dir1/prog");
+                        copy(FalseExe.path(), "dir3/prog");
                         pb.environment().put("PATH","dir3");
                         equal(run(pb).exitValue(), True.exitValue());
-                        copy("/bin/true", "dir3/prog");
-                        copy("/bin/false", "dir1/prog");
+                        copy(TrueExe.path(), "dir3/prog");
+                        copy(FalseExe.path(), "dir1/prog");
                         equal(run(pb).exitValue(), False.exitValue());
 
                     } finally {
@@ -624,6 +624,13 @@
              new File("/bin/false").exists());
     }
 
+    static class BusyBox {
+        public static boolean is() { return is; }
+        private static final boolean is =
+            (! Windows.is() &&
+             new File("/bin/busybox").exists());
+    }
+
     static class UnicodeOS {
         public static boolean is() { return is; }
         private static final String osName = System.getProperty("os.name");
@@ -662,6 +669,45 @@
         }
     }
 
+    // On alpine linux, /bin/true and /bin/false are just links to /bin/busybox.
+    // Some tests copy /bin/true and /bin/false to files with a different filename.
+    // However, copying the busbox executable into a file with a different name
+    // won't result in the expected return codes. As workaround, we create
+    // executable files that can be copied and produce the exepected return
+    // values. We use this workaround, if we find the busybox executable.
+
+    private static class TrueExe {
+        public static String path() { return path; }
+        private static final String path = path0();
+        private static String path0(){
+            if (!BusyBox.is()) {
+                return "/bin/true";
+            }
+            else {
+                File trueExe = new File("true");
+                setFileContents(trueExe, "#!/bin/true\n");
+                trueExe.setExecutable(true);
+                return trueExe.getAbsolutePath();
+            }
+        }
+    }
+
+    private static class FalseExe {
+        public static String path() { return path; }
+        private static final String path = path0();
+        private static String path0(){
+            if (!BusyBox.is()) {
+                return "/bin/false";
+            }
+            else {
+                File falseExe = new File("false");
+                setFileContents(falseExe, "#!/bin/false\n");
+                falseExe.setExecutable(true);
+                return falseExe.getAbsolutePath();
+            }
+        }
+    }
+
     static class EnglishUnix {
         private static final Boolean is =
             (! Windows.is() && isEnglish("LANG") && isEnglish("LC_ALL"));
@@ -1965,7 +2011,7 @@
             //----------------------------------------------------------------
             try {
                 new File("suBdiR").mkdirs();
-                copy("/bin/true", "suBdiR/unliKely");
+                copy(TrueExe.path(), "suBdiR/unliKely");
                 final ProcessBuilder pb =
                     new ProcessBuilder(new String[]{"unliKely"});
                 pb.environment().put("PATH", "suBdiR");
--- old/test/jdk/java/lang/ProcessHandle/InfoTest.java
+++ new/test/jdk/java/lang/ProcessHandle/InfoTest.java
@@ -298,7 +298,14 @@
                 }
                 if (info.command().isPresent()) {
                     String command = info.command().get();
-                    String expected = Platform.isWindows() ? "sleep.exe" : "sleep";
+                    String expected = "sleep";
+                    if (Platform.isWindows()) {
+                        expected = "sleep.exe";
+                    } else if (new File("/bin/busybox").exists()) {
+                        // With busybox sleep is just a sym link to busybox.
+                        // The busbox executable is seen as ProcessHandle.Info command.
+                        expected = "busybox";
+                    }
                     Assert.assertTrue(command.endsWith(expected), "Command: expected: \'" +
                             expected + "\', actual: " + command);
 
--- old/test/hotspot/jtreg/runtime/TLS/exestack-tls.c
+++ new/test/hotspot/jtreg/runtime/TLS/exestack-tls.c
@@ -26,7 +26,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <gnu/libc-version.h>

 // Declare the thread local variable(s) in the main executable. This can be
 // used to demonstrate the issues associated with the on-stack static TLS blocks
@@ -56,6 +55,10 @@

 // glibc 2.15 introduced __pthread_get_minstack
 int glibc_has_pthread_get_minstack() {
+#if !defined(__GLIBC__) && !defined(__UCLIBC__)
+  // Hard code Alpine Linux supported musl compatible settings
+  return 0;
+#else
   const char* glibc_vers = gnu_get_libc_version();
   const int glibc_vers_major = atoi(glibc_vers);
   const int glibc_vers_minor = atoi(strchr(glibc_vers, '.') + 1);;
@@ -65,6 +68,7 @@
   }
   printf("This version does not provide __pthread_get_minstack\n");
   return 0;
+#endif
 }

 int run(jboolean addTLS) {