#
# Copyright (c) 2011, 2019, 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.
#

################################################################
#
# Setup common utility functions.
#
################################################################

ifndef _MAKEBASE_GMK
_MAKEBASE_GMK := 1

ifeq ($(wildcard $(SPEC)),)
  $(error MakeBase.gmk needs SPEC set to a proper spec.gmk)
endif

# By defining this pseudo target, make will automatically remove targets
# if their recipe fails so that a rebuild is automatically triggered on the
# next make invocation.
.DELETE_ON_ERROR:

################################################################################
# Definitions for special characters
################################################################################

# When calling macros, the spaces between arguments are
# often semantically important! Sometimes we need to subst
# spaces and commas, therefore we need the following macros.
X:=
SPACE:=$(X) $(X)
COMMA:=,
DOLLAR:=$$
HASH:=\#
LEFT_PAREN:=(
RIGHT_PAREN:=)
SQUOTE:='
#'
DQUOTE:="
#"
define NEWLINE


endef

# In GNU Make 4.0 and higher, there is a file function for writing to files.
ifeq (4.0, $(firstword $(sort 4.0 $(MAKE_VERSION))))
  HAS_FILE_FUNCTION := true
  CORRECT_FUNCTION_IN_RECIPE_EVALUATION := true
endif


# For convenience, MakeBase.gmk continues to include these separate files, at
# least for now.

include $(TOPDIR)/make/common/Utils.gmk
include $(TOPDIR)/make/common/MakeIO.gmk
include $(TOPDIR)/make/common/CopyFiles.gmk

################################################################################
# Functions for timers
################################################################################

# Store the build times in this directory.
BUILDTIMESDIR=$(OUTPUTDIR)/make-support/build-times

# Record starting time for build of a sub repository.
define RecordStartTime
	$(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_start_$(strip $1) && \
	$(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_start_$(strip $1)_human_readable
endef

# Record ending time and calculate the difference and store it in a
# easy to read format. Handles builds that cross midnight. Expects
# that a build will never take 24 hours or more.
define RecordEndTime
	$(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_end_$(strip $1)
	$(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_end_$(strip $1)_human_readable
	$(ECHO) `$(CAT) $(BUILDTIMESDIR)/build_time_start_$(strip $1)` `$(CAT) $(BUILDTIMESDIR)/build_time_end_$(strip $1)` $1 | \
	    $(NAWK) '{ F=$$7; T=$$14; if (F > T) { T+=3600*24 }; D=T-F; H=int(D/3600); \
	    M=int((D-H*3600)/60); S=D-H*3600-M*60; printf("%02d:%02d:%02d %s\n",H,M,S,$$15); }' \
	    > $(BUILDTIMESDIR)/build_time_diff_$(strip $1)
endef

# Hook to be called when starting to execute a top-level target
define TargetEnter
	$(PRINTF) "## Starting $(patsubst %-only,%,$@)\n"
	$(call RecordStartTime,$(patsubst %-only,%,$@))
endef

# Hook to be called when finish executing a top-level target
define TargetExit
	$(call RecordEndTime,$(patsubst %-only,%,$@))
	$(PRINTF) "## Finished $(patsubst %-only,%,$@) (build time %s)\n\n" \
	    "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_$(patsubst %-only,%,$@) | $(CUT) -f 1 -d ' '`"
endef

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

# A file containing a way to uniquely identify the source code revision that
# the build was created from
SOURCE_REVISION_TRACKER := $(SUPPORT_OUTPUTDIR)/src-rev/source-revision-tracker

# Locate all hg repositories included in the forest, as absolute paths
FindAllReposAbs = \
    $(strip $(sort $(dir $(filter-out $(TOPDIR)/build/%, $(wildcard \
        $(addprefix $(TOPDIR)/, .hg */.hg */*/.hg */*/*/.hg */*/*/*/.hg) \
        $(addprefix $(TOPDIR)/, .git */.git */*/.git */*/*/.git */*/*/*/.git) \
    )))))

# Locate all hg repositories included in the forest, as relative paths
FindAllReposRel = \
    $(strip $(subst $(TOPDIR)/,.,$(patsubst $(TOPDIR)/%/, %, $(FindAllReposAbs))))

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

define SetupLogging
  ifeq ($$(LOG_PROFILE_TIMES_FILE), true)
    ifeq ($$(IS_GNU_TIME), yes)
      SHELL :=  $$(BASH) $$(TOPDIR)/make/scripts/shell-profiler.sh \
                gnutime $$(TIME) \
                $$(OUTPUTDIR)/build-profile.log $$(SHELL)
    else ifneq ($$(FLOCK), )
      SHELL :=  $$(BASH) $$(TOPDIR)/make/scripts/shell-profiler.sh \
                flock $$(FLOCK) \
                $$(OUTPUTDIR)/build-profile.log $$(SHELL)
    endif
  endif

  ifeq ($$(LOG_LEVEL), trace)
    SHELL_NO_RECURSE := $$(SHELL)
    # Shell redefinition trick inspired by http://www.cmcrossroads.com/ask-mr-make/6535-tracing-rule-execution-in-gnu-make
    # For each target executed, will print
    # Building <TARGET> (from <FIRST PREREQUISITE>) (<ALL NEWER PREREQUISITES> newer)
    # but with a limit of 20 on <ALL NEWER PREREQUISITES>, to avoid cluttering logs too much
    # (and causing a crash on Cygwin).
    SHELL = $$(warning $$(if $$@,Building $$@,Running shell command) $$(if $$<, (from $$<))$$(if $$?, ($$(wordlist 1, 20, $$?) $$(if $$(wordlist 21, 22, $$?), ... [in total $$(words $$?) files]) newer)))$$(SHELL_NO_RECURSE) -x
  endif

  # The warn level can never be turned off
  LogWarn = $$(info $$(strip $$1))
  LOG_WARN :=
  ifneq ($$(findstring $$(LOG_LEVEL), info debug trace),)
    LogInfo = $$(info $$(strip $$1))
    LOG_INFO :=
  else
    LogInfo =
    LOG_INFO := > /dev/null
  endif
  ifneq ($$(findstring $$(LOG_LEVEL), debug trace),)
    LogDebug = $$(info $$(strip $$1))
    LOG_DEBUG :=
  else
    LogDebug =
    LOG_DEBUG := > /dev/null
  endif
  ifneq ($$(findstring $$(LOG_LEVEL), trace),)
    LogTrace = $$(info $$(strip $$1))
    LOG_TRACE :=
  else
    LogTrace =
    LOG_TRACE := > /dev/null
  endif
endef

# Make sure logging is setup for everyone that includes MakeBase.gmk.
$(eval $(call SetupLogging))

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

MAX_PARAMS := 36
PARAM_SEQUENCE := $(call sequence, 2, $(MAX_PARAMS))

# Template for creating a macro taking named parameters. To use it, assign the
# template to a variable with the name you want for your macro, using '='
# assignment. Then define a macro body with the suffix "Body". The Body macro
# should take 1 parameter which should be a unique string for that invocation
# of the macro.
# Ex:
# SetupFoo = $(NamedParamsMacroTemplate)
# define SetupFooBody
#   # do something
#   # access parameters as $$($1_BAR)
# endef
# Call it like this
# $(eval $(call SetupFoo, BUILD_SOMETHING, \
#     BAR := some parameter value, \
# ))
define NamedParamsMacroTemplate
  $(if $($(MAX_PARAMS)),$(error Internal makefile error: \
      Too many named arguments to macro, please update MAX_PARAMS in MakeBase.gmk))
  # Iterate over 2 3 4... and evaluate the named parameters with $1_ as prefix
  $(foreach i,$(PARAM_SEQUENCE), $(if $(strip $($i)),\
    $(strip $1)_$(strip $(call EscapeHash, $(call DoubleDollar, $($i))))$(NEWLINE)))
  # Debug print all named parameter names and values
  $(if $(findstring $(LOG_LEVEL),debug trace), \
    $(info $0 $(strip $1) $(foreach i,$(PARAM_SEQUENCE), \
      $(if $(strip $($i)),$(NEWLINE) $(strip [$i] $(if $(filter $(LOG_LEVEL), trace), \
        $($i), $(wordlist 1, 20, $($(i))) $(if $(word 21, $($(i))), ...)))))))

  $(if $(DEBUG_$(strip $1)),
    $(info -------- <<< Begin expansion of $(strip $1)) \
    $(info $(call $(0)Body,$(strip $1))) \
    $(info -------- >>> End expansion of $(strip $1)) \
  )

  $(call $(0)Body,$(strip $1))
endef

################################################################################
# Make directory without forking mkdir if not needed.
#
# If a directory with an encoded space is provided, the wildcard function
# sometimes returns false answers (typically if the dir existed when the
# makefile was parsed, but was deleted by a previous rule). In that case, always
# call mkdir regardless of what wildcard says.
#
# 1: List of directories to create
MakeDir = \
    $(strip \
        $(eval MakeDir_dirs_to_make := $(strip $(foreach d, $1, \
          $(if $(findstring ?, $d), '$(call DecodeSpace, $d)', \
            $(if $(wildcard $d), , $d) \
          ) \
        ))) \
        $(if $(MakeDir_dirs_to_make), $(shell $(MKDIR) -p $(MakeDir_dirs_to_make))) \
    )

# Make directory for target file. Should handle spaces in filenames. Just
# calling $(call MakeDir $(@D)) will not work if the directory contains a space
# and the target file already exists. In that case, the target file will have
# its wildcard ? resolved and the $(@D) will evaluate each space separated dir
# part on its own.
MakeTargetDir = \
    $(call MakeDir, $(dir $(call EncodeSpace, $@)))

################################################################################
# All install-file and related macros automatically call DecodeSpace when needed.

ifeq ($(call isTargetOs, solaris), true)
  # On Solaris, if the target is a symlink and exists, cp won't overwrite.
  # Cp has to operate in recursive mode to allow for -P flag, to preserve soft links. If the
  # name of the target file differs from the source file, rename after copy.
  # If the source and target parent directories are the same, recursive copy doesn't work
  # so we fall back on regular copy, which isn't preserving symlinks.
  define install-file
	$(call MakeTargetDir)
	$(RM) '$(call DecodeSpace, $@)'
	if [ '$(call DecodeSpace, $(dir $(call EncodeSpace, $@)))' != \
	    '$(call DecodeSpace, $(dir $(call EncodeSpace, $<)))' ]; then \
	  $(CP) -f -r -P '$(call DecodeSpace, $<)' \
	      '$(call DecodeSpace, $(dir $(call EncodeSpace, $@)))'; \
	  if [ '$(call DecodeSpace, $(notdir $(call EncodeSpace, $@)))' != \
	      '$(call DecodeSpace, $(notdir $(call EncodeSpace, $(<))))' ]; then \
	    $(MV) '$(call DecodeSpace, $(dir $(call EncodeSpace, $@))/$(notdir $(call EncodeSpace, $<)))' \
	        '$(call DecodeSpace, $@)'; \
	  fi; \
	else \
	  if [ -L '$(call DecodeSpace, $<)' ]; then \
	    $(ECHO) "Source file is a symlink and target is in the same directory: $< $@" ; \
	    exit 1; \
	  fi; \
	  $(CP) -f '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'; \
	fi
  endef
else ifeq ($(call isTargetOs, macosx), true)
  # On mac, extended attributes sometimes creep into the source files, which may later
  # cause the creation of ._* files which confuses testing. Clear these with xattr if
  # set. Some files get their write permissions removed after being copied to the
  # output dir. When these are copied again to images, xattr would fail. By only clearing
  # attributes when they are present, failing on this is avoided.
  #
  # If copying a soft link to a directory, need to delete the target first to avoid
  # weird errors.
  define install-file
	$(call MakeTargetDir)
	$(RM) '$(call DecodeSpace, $@)'
        # Work around a weirdness with cp on Macosx. When copying a symlink, if
        # the target of the link is write protected (e.g. 444), cp will add
        # write permission for the user on the target file (644). Avoid this by
        # using ln to create a new link instead.
	if [ -h '$(call DecodeSpace, $<)' ]; then \
	  $(LN) -s "`$(READLINK) '$(call DecodeSpace, $<)'`" '$(call DecodeSpace, $@)'; \
	else \
	  $(CP) -fRP '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'; \
	fi
	if [ -n "`$(XATTR) -ls '$(call DecodeSpace, $@)'`" ]; then \
	  $(XATTR) -cs '$(call DecodeSpace, $@)'; \
	fi
  endef
else
  define install-file
	$(call MakeTargetDir)
	$(CP) -fP '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'
  endef
endif

# Variant of install file that does not preserve symlinks
define install-file-nolink
	$(call MakeTargetDir)
	$(CP) -f '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'
endef

################################################################################
# link-file-* works similarly to install-file but creates a symlink instead.
# There are two versions, either creating a relative or an absolute link. Be
# careful when using this on Windows since the symlink created is only valid in
# the unix emulation environment.
define link-file-relative
	$(call MakeTargetDir)
	$(RM) '$(call DecodeSpace, $@)'
	$(LN) -s '$(call DecodeSpace, $(call RelativePath, $<, $(@D)))' '$(call DecodeSpace, $@)'
endef

define link-file-absolute
	$(call MakeTargetDir)
	$(RM) '$(call DecodeSpace, $@)'
	$(LN) -s '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'
endef

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

ifneq ($(DISABLE_CACHE_FIND), true)
  # In Cygwin, finds are very costly, both because of expensive forks and because
  # of bad file system caching. Find is used extensively in $(shell) commands to
  # find source files. This makes rerunning make with no or few changes rather
  # expensive. To speed this up, these two macros are used to cache the results
  # of simple find commands for reuse.
  #
  # Runs a find and stores both the directories where it was run and the results.
  # This macro can be called multiple times to add to the cache. Only finds files
  # with no filters.
  #
  # Files containing space will get spaces replaced with ? because GNU Make
  # cannot handle lists of files with space in them. By using ?, make will match
  # the wildcard to space in many situations so we don't need to replace back
  # to space on every use. While not a complete solution it does allow some uses
  # of CacheFind to function with spaces in file names, including for
  # SetupCopyFiles.
  #
  # Needs to be called with $(eval )
  #
  # Even if the performance benifit is negligible on other platforms, keep the
  # functionality active unless explicitly disabled to exercise it more.
  #
  # Initialize FIND_CACHE_DIRS with := to make it a non recursively-expanded variable
  FIND_CACHE_DIRS :=
  # Param 1 - Dirs to find in
  # Param 2 - (optional) specialization. Normally "-a \( ... \)" expression.
  define FillCacheFind
    # Filter out already cached dirs. The - is needed when FIND_CACHE_DIRS is empty
    # since filter out will then return empty.
    FIND_CACHE_NEW_DIRS := $$(filter-out $$(addsuffix /%,\
        - $(FIND_CACHE_DIRS)) $(FIND_CACHE_DIRS), $1)
    ifneq ($$(FIND_CACHE_NEW_DIRS), )
      # Remove any trailing slash from dirs in the cache dir list
      FIND_CACHE_DIRS += $$(patsubst %/,%, $$(FIND_CACHE_NEW_DIRS))
      FIND_CACHE := $$(sort $$(FIND_CACHE) \
          $$(shell $(FIND) $$(wildcard $$(FIND_CACHE_NEW_DIRS)) \
              \( -type f -o -type l \) $2 | $(TR) ' ' '?'))
    endif
  endef

  # Mimics find by looking in the cache if all of the directories have been cached.
  # Otherwise reverts to shell find. This is safe to call on all platforms, even if
  # cache is deactivated.
  #
  # $1 can be either a directory or a file. If it's a directory, make
  # sure we have exactly one trailing slash before the wildcard.
  # The extra - is needed when FIND_CACHE_DIRS is empty but should be harmless.
  #
  # Param 1 - Dirs to find in
  # Param 2 - (optional) specialization. Normally "-a \( ... \)" expression.
  define CacheFind
    $(if $(filter-out $(addsuffix /%,- $(FIND_CACHE_DIRS)) $(FIND_CACHE_DIRS),$1), \
      $(if $(wildcard $1), $(shell $(FIND) $(wildcard $1) \( -type f -o -type l \) $2 \
          | $(TR) ' ' '?')), \
      $(filter $(addsuffix /%,$(patsubst %/,%,$1)) $1,$(FIND_CACHE)))
  endef

else
  # If CacheFind is disabled, just run the find command.
  # Param 1 - Dirs to find in
  # Param 2 - (optional) specialization. Normally "-a \( ... \)" expression.
  define CacheFind
    $(if $(wildcard $1, \
      $(shell $(FIND) $(wildcard $1) \( -type f -o -type l \) $2 | $(TR) ' ' '?') \
    )
  endef
endif

################################################################################
# FixPath
#
# On Windows, converts a path from cygwin/unix style (e.g. /bin/foo) into
# "mixed mode" (e.g. c:/cygwin/bin/foo). On other platforms, return the path
# unchanged.
# This is normally not needed since we use the FIXPATH prefix for command lines,
# but might be needed in certain circumstances.
ifeq ($(call isTargetOs, windows), true)
  FixPath = \
      $(shell $(CYGPATH) -m $1)
else
  FixPath = \
      $1
endif

################################################################################
# DependOnVariable
#
# This macro takes a variable name and puts the value in a file only if the
# value has changed since last. The name of the file is returned. This can be
# used to create rule dependencies on make variable values. The following
# example would get rebuilt if the value of SOME_VAR was changed:
#
# path/to/some-file: $(call DependOnVariable, SOME_VAR)
#         echo $(SOME_VAR) > $@
#
# Note that leading and trailing white space in the value is ignored.
#

# Defines the sub directory structure to store variable value file in
DependOnVariableDirName = \
    $(strip $(addsuffix $(if $(MODULE),/$(MODULE)), \
        $(subst $(TOPDIR)/,, $(if $(filter /%, $(firstword $(MAKEFILE_LIST))), \
          $(firstword $(MAKEFILE_LIST)), \
          $(CURDIR)/$(firstword $(MAKEFILE_LIST))))))

# Defines the name of the file to store variable value in. Generates a name
# unless parameter 2 is given.
# Param 1 - Name of variable
# Param 2 - (optional) name of file to store value in
DependOnVariableFileName = \
    $(strip $(if $(strip $2), $2, \
      $(MAKESUPPORT_OUTPUTDIR)/vardeps/$(DependOnVariableDirName)/$(strip $1).vardeps))

# Does the actual work with parameters stripped.
# If the file exists AND the contents is the same as the variable, do nothing
# else print a new file.
# Always returns the name of the file where the value was printed.
# Param 1 - Name of variable
# Param 2 - (optional) name of file to store value in
DependOnVariableHelper = \
    $(strip \
        $(eval -include $(call DependOnVariableFileName, $1, $2)) \
        $(if $(call equals, $(strip $($1)), $(strip $($1_old))),,\
          $(call MakeDir, $(dir $(call DependOnVariableFileName, $1, $2))) \
          $(if $(findstring $(LOG_LEVEL), trace), \
              $(info NewVariable $1: >$(strip $($1))<) \
              $(info OldVariable $1: >$(strip $($1_old))<)) \
          $(call WriteFile, $1_old:=$(call DoubleDollar,$(call EscapeHash,$($1))), \
              $(call DependOnVariableFileName, $1, $2))) \
        $(call DependOnVariableFileName, $1, $2) \
    )

# Main macro
# Param 1 - Name of variable
# Param 2 - (optional) name of file to store value in
DependOnVariable = \
    $(call DependOnVariableHelper,$(strip $1),$(strip $2))

# LogCmdlines is only intended to be used by ExecuteWithLog
ifeq ($(LOG_CMDLINES), true)
  LogCmdlines = $(info $(strip $1))
else
  LogCmdlines =
endif

################################################################################
# ExecuteWithLog will run a command and log the output appropriately. This is
# meant to be used by commands that do "real" work, like a compilation.
# The output is stored in a specified log file, which is displayed at the end
# of the build in case of failure. The  command line itself is stored in a file,
# and also logged to stdout if the LOG=cmdlines option has been given.
#
# NOTE: If the command redirects stdout, the caller needs to wrap it in a
# subshell (by adding parentheses around it), otherwise the redirect to the
# subshell tee process will create a race condition where the target file may
# not be fully written when the make recipe is done.
#
# Param 1 - The path to base the name of the log file / command line file on
# Param 2 - The command to run
ExecuteWithLog = \
  $(call LogCmdlines, Exececuting: [$(strip $2)]) \
  $(call MakeDir, $(dir $(strip $1))) \
  $(call WriteFile, $2, $(strip $1).cmdline) \
  ( $(RM) $(strip $1).log && $(strip $2) > >($(TEE) -a $(strip $1).log) 2> >($(TEE) -a $(strip $1).log >&2) || \
      ( exitcode=$(DOLLAR)? && \
      $(CP) $(strip $1).log $(MAKESUPPORT_OUTPUTDIR)/failure-logs/$(subst /,_,$(patsubst $(OUTPUTDIR)/%,%,$(strip $1))).log && \
      $(CP) $(strip $1).cmdline $(MAKESUPPORT_OUTPUTDIR)/failure-logs/$(subst /,_,$(patsubst $(OUTPUTDIR)/%,%,$(strip $1))).cmdline && \
      exit $(DOLLAR)exitcode ) )

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

# Hook to include the corresponding custom file, if present.
$(eval $(call IncludeCustomExtension, common/MakeBase.gmk))

endif # _MAKEBASE_GMK