#
# Copyright (c) 2013, 2023, 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 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
JVM_MAPFILE := $(JVM_OUTPUTDIR)/mapfile

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

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

JVM_ASFLAGS += $(EXTRA_ASFLAGS)

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='"$(DEBUG_LEVEL)"' \
    -DHOTSPOT_BUILD_USER='"$(USERNAME)"' \
    -DHOTSPOT_VM_DISTRO='"$(HOTSPOT_VM_DISTRO)"' \
    -DCPU='"$(OPENJDK_TARGET_CPU_VM_VERSION)"' \
    -DHOTSPOT_BUILD_TIME='"$(HOTSPOT_BUILD_TIME)"' \
    #

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

DISABLED_WARNINGS_gcc := array-bounds comment delete-non-virtual-dtor \
    empty-body ignored-qualifiers implicit-fallthrough int-in-bool-context \
    maybe-uninitialized missing-field-initializers parentheses \
    shift-negative-value unknown-pragmas

DISABLED_WARNINGS_clang := ignored-qualifiers sometimes-uninitialized \
    missing-braces delete-non-abstract-non-virtual-dtor unknown-pragmas

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_xlc := tautological-compare shift-negative-value

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

ifeq ($(call isTargetOs, linux macosx windows), true)
  JVM_PRECOMPILED_HEADER := $(TOPDIR)/src/hotspot/share/precompiled/precompiled.hpp
endif

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 SetupNativeCompilation 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))

################################################################################
# Now set up the actual compilation of the main hotspot native library

$(eval $(call SetupJdkLibrary, BUILD_LIBJVM, \
    NAME := jvm, \
    TOOLCHAIN := TOOLCHAIN_LINK_CXX, \
    OUTPUT_DIR := $(JVM_LIB_OUTPUTDIR), \
    SRC := $(JVM_SRC_DIRS), \
    EXCLUDES := $(JVM_EXCLUDES), \
    EXCLUDE_FILES := $(JVM_EXCLUDE_FILES), \
    EXCLUDE_PATTERNS := $(JVM_EXCLUDE_PATTERNS), \
    CFLAGS := $(JVM_CFLAGS), \
    abstract_vm_version.cpp_CXXFLAGS := $(CFLAGS_VM_VERSION), \
    arguments.cpp_CXXFLAGS := $(CFLAGS_VM_VERSION), \
    DISABLED_WARNINGS_gcc := $(DISABLED_WARNINGS_gcc), \
    DISABLED_WARNINGS_gcc_ad_$(HOTSPOT_TARGET_CPU_ARCH).cpp := nonnull, \
    DISABLED_WARNINGS_gcc_cgroupV1Subsystem_linux.cpp := address, \
    DISABLED_WARNINGS_gcc_cgroupV2Subsystem_linux.cpp := address, \
    DISABLED_WARNINGS_gcc_interp_masm_x86.cpp := uninitialized, \
    DISABLED_WARNINGS_gcc_postaloc.cpp := address, \
    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_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_xlc := $(DISABLED_WARNINGS_xlc), \
    DISABLED_WARNINGS_microsoft := $(DISABLED_WARNINGS_microsoft), \
    ASFLAGS := $(JVM_ASFLAGS), \
    LDFLAGS := $(JVM_LDFLAGS), \
    LIBS := $(JVM_LIBS), \
    OPTIMIZATION := $(JVM_OPTIMIZATION), \
    OBJECT_DIR := $(JVM_OUTPUTDIR)/objs, \
    MAPFILE := $(JVM_MAPFILE), \
    USE_MAPFILE_FOR_SYMBOLS := true, \
    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), \
))

# 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) $(JVM_MAPFILE), \
    $(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 ...

# Include mapfile generation. It relies on BUILD_LIBJVM_ALL_OBJS which is only
# defined after the above call to BUILD_LIBJVM. Mapfile will be generated
# after all object files are built, but before the jvm library is linked.
include lib/JvmMapfile.gmk

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.

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 := \
        _ZdaPv \
        _ZdlPv \
        _Znam \
        _Znwm \
        #
    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