CompileJvm.gmk

#
# Copyright (c) 2013, 2026, 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.  Oracle designates this
# particular file as subject to the "Classpath" exception as provided
# by Oracle in the LICENSE file that accompanied this code.
#
# 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.
#

include MakeIncludeStart.gmk
ifeq ($(INCLUDE), true)

################################################################################

include CopyFiles.gmk

# Include support files that will setup compiler flags due to the selected
# jvm feature set, specific file overrides, and general flags.
include lib/JvmFeatures.gmk
include lib/JvmOverrideFiles.gmk
include lib/JvmFlags.gmk

################################################################################
# Setup compilation of the main Hotspot native library (libjvm).

JVM_OUTPUTDIR := $(JVM_VARIANT_OUTPUTDIR)/libjvm

################################################################################
# Platform independent setup

JVM_LDFLAGS += \
    $(SHARED_LIBRARY_FLAGS) \
    $(JVM_LDFLAGS_FEATURES) \
    $(EXTRA_LDFLAGS) \
    #

JVM_ASFLAGS += $(EXTRA_ASFLAGS)

JVM_ASFLAGS += \
        -I$(TOPDIR)/src/hotspot/os_cpu/$(HOTSPOT_TARGET_OS)_$(HOTSPOT_TARGET_CPU_ARCH) \
        -I$(TOPDIR)/src/hotspot/os/$(HOTSPOT_TARGET_OS) \
        -I$(TOPDIR)/src/hotspot/os/$(HOTSPOT_TARGET_OS_TYPE) \
        #

JVM_LIBS += \
    $(JVM_LIBS_FEATURES) \
    #

# These files and directories are always excluded
JVM_EXCLUDE_FILES += args.cc
JVM_EXCLUDES += adlc

# Needed by abstract_vm_version.cpp
ifeq ($(call isTargetCpu, x86_64), true)
  OPENJDK_TARGET_CPU_VM_VERSION := amd64
else
  OPENJDK_TARGET_CPU_VM_VERSION := $(OPENJDK_TARGET_CPU)
endif

ifeq ($(VERSION_BUILD), )
  # Hotspot cannot handle an empty build number
  VERSION_BUILD := 0
endif

ifeq ($(HOTSPOT_BUILD_TIME), )
  HOTSPOT_BUILD_TIME := $(call EpochToISO8601, $(shell $(DATE) +"%s"))
endif

CFLAGS_VM_VERSION := \
    $(VERSION_CFLAGS) \
    -DHOTSPOT_VERSION_STRING='"$(VERSION_STRING)"' \
    -DDEBUG_LEVEL='"$(DEBUG_LEVEL)"' \
    -DHOTSPOT_VM_DISTRO='"$(HOTSPOT_VM_DISTRO)"' \
    -DCPU='"$(OPENJDK_TARGET_CPU_VM_VERSION)"' \
    -DHOTSPOT_BUILD_TIME='"$(HOTSPOT_BUILD_TIME)"' \
    -DJVM_VARIANT='"$(JVM_VARIANT)"' \
    #

################################################################################
# Disabled warnings

DISABLED_WARNINGS_gcc := array-bounds comment delete-non-virtual-dtor \
    empty-body format-zero-length implicit-fallthrough int-in-bool-context \
    invalid-offsetof \
    maybe-uninitialized missing-field-initializers \
    shift-negative-value unknown-pragmas unused-but-set-variable \
    unused-local-typedefs unused-variable

DISABLED_WARNINGS_clang := delete-non-abstract-non-virtual-dtor \
    invalid-offsetof missing-braces \
    sometimes-uninitialized unknown-pragmas unused-but-set-variable \
    unused-local-typedef unused-private-field unused-variable

ifneq ($(DEBUG_LEVEL), release)
  # Assert macro gives warning
  DISABLED_WARNINGS_clang += tautological-constant-out-of-range-compare
  # Some reasonable asserts produce warnings on GCC <= 7
  DISABLED_WARNINGS_gcc += strict-overflow
endif

DISABLED_WARNINGS_microsoft := 4624 4244 4291 4146 4127 4722

################################################################################
# Platform specific setup

# ARM source selection

ifeq ($(call And, $(call isTargetOs, linux) $(call isTargetCpu, arm)), true)
  JVM_EXCLUDE_PATTERNS += arm_64

else ifeq ($(call And, $(call isTargetOs, linux) $(call isTargetCpu, aarch64)), true)
  # For 64-bit arm builds, we use the 64 bit hotspot/src/cpu/arm
  # hotspot sources if HOTSPOT_TARGET_CPU_ARCH is set to arm.
  # Exclude the aarch64 and 32 bit arm files for this build.
  ifeq ($(HOTSPOT_TARGET_CPU_ARCH), arm)
    JVM_EXCLUDE_PATTERNS += arm_32 aarch64
  endif
endif

JVM_PRECOMPILED_HEADER := $(TOPDIR)/src/hotspot/share/precompiled/precompiled.hpp

ifeq ($(call isTargetCpu, x86), true)
  JVM_EXCLUDE_PATTERNS += x86_64
else ifeq ($(call isTargetCpu, x86_64), true)
  JVM_EXCLUDE_PATTERNS += x86_32
endif

JVM_OPTIMIZATION ?= HIGHEST_JVM

# Need to set JVM_STRIPFLAGS to the default value from SPEC since the STRIPFLAGS
# parameter to SetupJdkLibrary allows an empty value to override the
# default.
JVM_STRIPFLAGS ?= $(STRIPFLAGS)

# This source set is reused so save in cache.
$(call FillFindCache, $(JVM_SRC_DIRS))

ifeq ($(SHIP_DEBUG_SYMBOLS), full)
  CFLAGS_SHIP_DEBUGINFO := -DSHIP_DEBUGINFO_FULL
else ifeq ($(SHIP_DEBUG_SYMBOLS), public)
  CFLAGS_SHIP_DEBUGINFO := -DSHIP_DEBUGINFO_PUBLIC
endif

ifeq ($(call isTargetOs, windows), true)
  ifeq ($(STATIC_LIBS), true)
    WIN_EXPORT_FILE := $(JVM_OUTPUTDIR)/static-win-exports.def
  else
    WIN_EXPORT_FILE := $(JVM_OUTPUTDIR)/win-exports.def
  endif

  JVM_LDFLAGS += -def:$(WIN_EXPORT_FILE)
endif

ifeq ($(call isTargetOs, linux bsd), true)
  HOTSPOT_VERSION_SCRIPT := $(TOPDIR)/make/data/hotspot-symbols/version-script-$(TOOLCHAIN_TYPE).txt

  JVM_LDFLAGS += -Wl,-version-script=$(HOTSPOT_VERSION_SCRIPT)
endif

################################################################################
## Build libjvm
################################################################################

$(eval $(call SetupJdkLibrary, BUILD_LIBJVM, \
    NAME := jvm, \
    LINK_TYPE := C++, \
    OUTPUT_DIR := $(JVM_LIB_OUTPUTDIR), \
    SRC := $(JVM_SRC_DIRS), \
    EXCLUDES := $(JVM_EXCLUDES), \
    EXCLUDE_FILES := $(JVM_EXCLUDE_FILES), \
    EXCLUDE_PATTERNS := $(JVM_EXCLUDE_PATTERNS), \
    DEFAULT_CFLAGS := false, \
    CFLAGS := $(JVM_CFLAGS), \
    abstract_vm_version.cpp_CXXFLAGS := $(CFLAGS_VM_VERSION), \
    arguments.cpp_CXXFLAGS := $(CFLAGS_VM_VERSION), \
    whitebox.cpp_CXXFLAGS := $(CFLAGS_SHIP_DEBUGINFO), \
    $(call ExtendFlags, $(TOPDIR)/src/hotspot/share/gc/g1, \
        g1Numa.cpp, _CXXFLAGS, $(CFLAGS_CONVERSION_WARNINGS)), \
    DISABLED_WARNINGS_gcc := $(DISABLED_WARNINGS_gcc), \
    DISABLED_WARNINGS_gcc_ad_$(HOTSPOT_TARGET_CPU_ARCH).cpp := nonnull, \
    DISABLED_WARNINGS_gcc_bytecodeInterpreter.cpp := unused-label, \
    DISABLED_WARNINGS_gcc_c1_Runtime1_aarch64.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_cgroupV1Subsystem_linux.cpp := address, \
    DISABLED_WARNINGS_gcc_cgroupV2Subsystem_linux.cpp := address, \
    DISABLED_WARNINGS_gcc_handshake.cpp := stringop-overflow, \
    DISABLED_WARNINGS_gcc_interp_masm_x86.cpp := uninitialized, \
    DISABLED_WARNINGS_gcc_javaClasses.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_jfrChunkWriter.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_jfrMemorySizer.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_jfrTraceIdKlassQueue.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_jvmciCodeInstaller.cpp := stringop-overflow, \
    DISABLED_WARNINGS_gcc_jvmFlag.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_jvmtiTagMap.cpp := stringop-overflow, \
    DISABLED_WARNINGS_gcc_macroAssembler_ppc_sha.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_postaloc.cpp := address, \
    DISABLED_WARNINGS_gcc_shenandoahLock.cpp := stringop-overflow, \
    DISABLED_WARNINGS_gcc_stubGenerator_s390.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_synchronizer.cpp := stringop-overflow, \
    DISABLED_WARNINGS_gcc_templateInterpreterGenerator_x86.cpp := unused-const-variable, \
    DISABLED_WARNINGS_gcc_xGlobals_ppc.cpp := unused-const-variable, \
    DISABLED_WARNINGS_clang := $(DISABLED_WARNINGS_clang), \
    DISABLED_WARNINGS_clang_arguments.cpp := missing-field-initializers, \
    DISABLED_WARNINGS_clang_codeBuffer.cpp := tautological-undefined-compare, \
    DISABLED_WARNINGS_clang_directivesParser.cpp := missing-field-initializers, \
    DISABLED_WARNINGS_clang_g1ParScanThreadState.cpp := delete-abstract-non-virtual-dtor, \
    DISABLED_WARNINGS_clang_g1YoungGCPostEvacuateTasks.cpp := delete-abstract-non-virtual-dtor, \
    DISABLED_WARNINGS_clang_management.cpp := missing-field-initializers, \
    DISABLED_WARNINGS_clang_notificationThread.cpp := bitwise-instead-of-logical, \
    DISABLED_WARNINGS_clang_os_bsd_aarch64.cpp := format-nonliteral, \
    DISABLED_WARNINGS_clang_os_posix.cpp := mismatched-tags missing-field-initializers, \
    DISABLED_WARNINGS_clang_aix_os_posix.cpp := format-nonliteral, \
    DISABLED_WARNINGS_clang_postaloc.cpp := tautological-undefined-compare, \
    DISABLED_WARNINGS_clang_serviceThread.cpp := bitwise-instead-of-logical, \
    DISABLED_WARNINGS_clang_vm_version_x86.cpp := missing-field-initializers, \
    DISABLED_WARNINGS_clang_zTracer.cpp := undefined-var-template, \
    DISABLED_WARNINGS_clang_aix_debug.cpp := format-nonliteral, \
    DISABLED_WARNINGS_clang_aix_jvm.cpp := format-nonliteral, \
    DISABLED_WARNINGS_clang_aix_osThread_aix.cpp := tautological-undefined-compare, \
    DISABLED_WARNINGS_microsoft := $(DISABLED_WARNINGS_microsoft), \
    ASFLAGS := $(JVM_ASFLAGS), \
    LD_SET_ORIGIN := false, \
    DEFAULT_LDFLAGS := false, \
    LDFLAGS := $(JVM_LDFLAGS), \
    LIBS := $(JVM_LIBS), \
    OPTIMIZATION := $(JVM_OPTIMIZATION), \
    LINK_TIME_OPTIMIZATION := $(JVM_LTO), \
    OBJECT_DIR := $(JVM_OUTPUTDIR)/objs, \
    STRIPFLAGS := $(JVM_STRIPFLAGS), \
    EMBED_MANIFEST := true, \
    RC_FILEDESC := $(HOTSPOT_VM_DISTRO) $(OPENJDK_TARGET_CPU_BITS)-Bit $(JVM_VARIANT) VM, \
    PRECOMPILED_HEADER := $(JVM_PRECOMPILED_HEADER), \
    PRECOMPILED_HEADER_EXCLUDE := $(JVM_PRECOMPILED_HEADER_EXCLUDE), \
))

ifeq ($(call isTargetOs, windows), true)
  # The following lines create a list of vftable symbols to be filtered out of
  # the symbol file. Removing this line causes the linker to complain about too
  # many (> 64K) symbols, so the _guess_ is that this line is here to keep down
  # the number of exported symbols below that limit.
  #
  # Some usages of C++ lambdas require the vftable symbol of classes that use
  # the lambda type as a template parameter. The usage of those classes won't
  # link if their vftable symbols are removed. That's why there's an exception
  # for vftable symbols containing the string 'lambda'.
  #
  # A very simple example of a lambda usage that fails if the lambda vftable
  # symbols are missing in the symbol file:
  #
  # #include <functional>
  # std::function<void()> f = [](){}
  FILTER_SYMBOLS_AWK_SCRIPT := \
      '{ \
        if ($$7 ~ /\?\?_7.*@@6B@/ && $$7 !~ /type_info/ && $$7 !~ /lambda/) print "  " $$7; \
      }'

  # A more correct solution would be to send BUILD_LIBJVM_ALL_OBJS instead of
  # cd && *.obj, but this will result in very long command lines, which could be
  # problematic.
  $(WIN_EXPORT_FILE): $(BUILD_LIBJVM_ALL_OBJS)
	$(call LogInfo, Generating list of symbols to export from object files)
	$(call MakeDir, $(@D))
	$(ECHO) "EXPORTS" > $@.tmp
	$(CD) $(BUILD_LIBJVM_OBJECT_DIR) && \
	    $(DUMPBIN) -symbols *$(OBJ_SUFFIX) | $(AWK) $(FILTER_SYMBOLS_AWK_SCRIPT) | $(SORT) -u >> $@.tmp
	$(RM) $@
	$(MV) $@.tmp $@

  $(BUILD_LIBJVM_TARGET): $(WIN_EXPORT_FILE)
endif

# Always recompile abstract_vm_version.cpp if libjvm needs to be relinked. This ensures
# that the internal vm version is updated as it relies on __DATE__ and __TIME__
# macros.
ABSTRACT_VM_VERSION_OBJ := $(JVM_OUTPUTDIR)/objs/abstract_vm_version$(OBJ_SUFFIX)
$(ABSTRACT_VM_VERSION_OBJ): $(filter-out $(ABSTRACT_VM_VERSION_OBJ), \
    $(BUILD_LIBJVM_TARGET_DEPS))

ifneq ($(GENERATE_COMPILE_COMMANDS_ONLY), true)
  ifeq ($(call isTargetOs, windows), true)
    # It doesn't matter which jvm.lib file gets exported, but we need
    # to pick just one.
    ifeq ($(JVM_VARIANT), $(JVM_VARIANT_MAIN))
      $(eval $(call SetupCopyFiles, COPY_JVM_LIB, \
          DEST := $(LIB_OUTPUTDIR), \
          FILES := $(BUILD_LIBJVM_IMPORT_LIBRARY), \
      ))
      TARGETS += $(COPY_JVM_LIB)
    endif
  endif
endif

# AIX warning explanation:
# 1500-010  : (W) WARNING in ...: Infinite loop.  Program may not stop.
#             There are several infinite loops in the vm, so better suppress.
# 1540-0198 : (W) The omitted keyword "private" is assumed for base class "...".
# 1540-0216 : (W) An expression of type .. cannot be converted to type ..
#             In hotspot this fires for functionpointer to pointer conversions
# 1540-1088 : (W) The exception specification is being ignored.
#             In hotspot this is caused by throw() in declaration of new() in nmethod.hpp.
# 1540-1090 : (I) The destructor of "..." might not be called.
# 1540-1639 : (I) The behavior of long type bit fields has changed ...

TARGETS += $(BUILD_LIBJVM)

################################################################################
# Hotspot disallows the use of global operators 'new' and 'delete'. This build
# time check helps enforce this requirement. If you trigger this check and the
# reference is not obvious from the source, GNU objdump can be used to help find
# the reference if compiled with GCC:
#
# objdump -lrdSC <path/to/file.o>
#
# -C demangle
# -d disassemble
# -r print relocation entries, interspersed with the disassembly
# -S print source code, intermixed with disassembly
# -l include filenames and line numbers
#
# Search the output for the operator(s) of interest, to see where they are
# referenced.
#
# When a reference to the global 'operator delete' is reported, it might be
# due to a "deleting destructor".  In this case, objdump may show the
# reference to be associated with but not actually in a destructor.  A
# deleting destructor is automatically generated for a class whose destructor
# is virtual.  A deleting destructor requires an accessible 'operator delete'
# for the associated class.  If the class doesn't provide a more specific
# declaration (either directly or by inheriting from a class that provides
# one) then the global definition will be used, triggering this check.
#

# The HotSpot wrapper for <new> declares as deprecated all the allocation and
# deallocation functions that use the global allocator. But that blocking
# isn't a bullet-proof. Some of these functions are implicitly available in
# every translation unit, without the need to include <new>. So even with that
# wrapper we still need this link-time check. The implicitly declared
# functions and their mangled names are - from C++17 6.7.4:
#
# void* operator new(size_t)               // _Znwm
# void* operator new(size_t, align_val_t)  // _ZnwmSt11align_val_t
#
# void operator delete(void*) noexcept                      // _ZdlPv
# void operator delete(void*, size_t) noexcept              // _ZdlPvm
# void operator delete(void*, align_val_t) noexcept         // _ZdlPvSt11align_val_t
# void operator delete(void*, size_t, align_val_t) noexcept // _ZdlPvmSt11align_val_t
#
# void* operator new[](size_t)               // _Znam
# void* operator new[](size_t, align_val_t)  // _ZnamSt11align_val_t
#
# void operator delete[](void*) noexcept                      // _ZdaPv
# void operator delete[](void*, size_t) noexcept              // _ZdaPvm
# void operator delete[](void*, align_val_t) noexcept         // _ZdaPvSt11align_val_t
# void operator delete[](void*, size_t, align_val_t) noexcept // _ZdaPvmSt11align_val_t

ifneq ($(GENERATE_COMPILE_COMMANDS_ONLY), true)
  ifneq ($(filter $(TOOLCHAIN_TYPE), gcc clang), )

    DEMANGLED_REGEXP := [^:]operator (new|delete)

    # Running c++filt to find offending symbols in all files is too expensive,
    # so use mangled names when looking for symbols.
    # Save the demangling for when something is actually found.
    MANGLED_SYMS := \
        _Znwm \
        _ZnwmSt11align_val_t \
        _ZdlPv \
        _ZdlPvm \
        _ZdlPvSt11align_val_t \
        _ZdlPvmSt11align_val_t \
        _Znam \
        _ZnamSt11align_val_t \
        _ZdaPv \
        _ZdaPvm \
        _ZdaPvSt11align_val_t \
        _ZdaPvmSt11align_val_t \
        #
    UNDEF_PATTERN := ' U '

    define SetupOperatorNewDeleteCheck
        $1.op_check: $1
	  $$(call ExecuteWithLog, $1.op_check, \
	      $$(NM) $$(NMFLAGS) $$<  2>&1 | $$(GREP) $$(addprefix -e , $$(MANGLED_SYMS)) | $$(GREP) $$(UNDEF_PATTERN) > $1.op_check || true)
	  if [ -s $1.op_check ]; then \
	    $$(ECHO) "$$(notdir $$<): Error: Use of global operators new and delete is not allowed in Hotspot:"; \
	    $$(NM) $$(NMFLAGS) $$< | $$(CXXFILT) | $$(EGREP) '$$(DEMANGLED_REGEXP)' | $$(GREP) $$(UNDEF_PATTERN); \
	    $$(ECHO) "See: $$(TOPDIR)/make/hotspot/lib/CompileJvm.gmk"; \
	    exit 1; \
	  fi

      TARGETS += $1.op_check
    endef

    $(foreach o, $(BUILD_LIBJVM_ALL_OBJS), $(eval $(call SetupOperatorNewDeleteCheck,$o)))
  endif
endif

################################################################################

endif # include guard
include MakeIncludeEnd.gmk