#

# Copyright (c) 2011, 2012, 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.

#

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

#

# This file contains helper functions for the top-level Makefile that does

# not depend on the spec.gmk file having been read. (The purpose of this 

# file is ju to avoid cluttering the top-level Makefile.)

#

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

ifndef _MAKEHELPERS_GMK

_MAKEHELPERS_GMK := 1

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

# Stuff to run at include time

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

# Find out which variables were passed explicitely on the make command line. These

# will be passed on to sub-makes, overriding spec.gmk settings.

MAKE_ARGS=$(foreach var,$(subst =command,,$(filter %=command,$(foreach var,$(.VARIABLES),$(var)=$(firstword $(origin $(var)))))),$(var)=$($(var)))

list_alt_overrides_with_origins=$(filter ALT_%=environment ALT_%=command,$(foreach var,$(.VARIABLES),$(var)=$(firstword $(origin $(var)))))

list_alt_overrides=$(subst =command,,$(subst =environment,,$(list_alt_overrides_with_origins)))

# Store the build times in this directory.

BUILDTIMESDIR=$(OUTPUT_ROOT)/tmp/buildtimes

# Global targets are possible to run either with or without a SPEC. The prototypical

# global target is "help". 

global_targets=help configure

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

# Functions

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

define CheckEnvironment

    # Find all environment or command line variables that begin with ALT.

    $(if $(list_alt_overrides),

        @$(PRINTF) "\nWARNING: You have the following ALT_ variables set:\n"

    @$(PRINTF) "$(foreach var,$(list_alt_overrides),$(var)=$$$(var))\n"

    @$(PRINTF) "ALT_ variables are deprecated and will be ignored. Please clean your environment.\n\n"

    )

endef

### Functions for timers

# Record starting time for build of a sub repository.

define RecordStartTime

    $(MKDIR) -p $(BUILDTIMESDIR)

    $(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_start_$1

    $(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_start_$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_$1

    $(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_end_$1_human_readable

    $(ECHO) `$(CAT) $(BUILDTIMESDIR)/build_time_start_$1` `$(CAT) $(BUILDTIMESDIR)/build_time_end_$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_$1

endef

# Find all build_time_* files and print their contents in a list sorted

# on the name of the sub repository.

define ReportBuildTimes

    $(BUILD_LOG_WRAPPER) $(PRINTF) -- "----- Build times -------\nStart %s\nEnd   %s\n%s\n%s\n-------------------------\n" \

        "`$(CAT) $(BUILDTIMESDIR)/build_time_start_TOTAL_human_readable`" \

        "`$(CAT) $(BUILDTIMESDIR)/build_time_end_TOTAL_human_readable`" \

        "`$(LS) $(BUILDTIMESDIR)/build_time_diff_* | $(GREP) -v _TOTAL | $(XARGS) $(CAT) | $(SORT) -k 2`" \

        "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_TOTAL`"

endef

define ResetAllTimers

    $$(shell $(MKDIR) -p $(BUILDTIMESDIR) &&  $(RM) $(BUILDTIMESDIR)/build_time_*)

endef

define StartGlobalTimer

    $(call RecordStartTime,TOTAL)

endef

define StopGlobalTimer

    $(call RecordEndTime,TOTAL)

endef

### Functions for managing makefile structure (start/end of makefile and individual targets)

# Do not indent this function, this will add whitespace at the start which the caller won't handle

define GetRealTarget

$(strip $(if $(MAKECMDGOALS),$(MAKECMDGOALS),all))

endef

# Do not indent this function, this will add whitespace at the start which the caller won't handle

define LastGoal

$(strip $(lastword $(call GetRealTarget)))

endef

# Check if the current target is the final target, as specified by

# the user on the command line. If so, call AtRootMakeEnd.

define CheckIfMakeAtEnd

    # Check if the current target is the last goal

    $(if $(filter $@,$(call LastGoal)),$(call AtMakeEnd))

    # If the target is 'foo-only', check if our goal was stated as 'foo'

    $(if $(filter $(patsubst %-only,%,$@),$(call LastGoal)),$(call AtMakeEnd))

    # If no goal is given, 'all' is default, but the last target executed for all is 'jdk-only'. Check for that, too.

    # At most one of the tests can be true.

    $(if $(subst all,,$(call LastGoal)),,$(if $(filter $@,jdk-only),$(call AtMakeEnd)))

endef

# Hook to be called when starting to execute a top-level target

define TargetEnter

    $(BUILD_LOG_WRAPPER) $(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,%,$@))

    $(BUILD_LOG_WRAPPER) $(PRINTF) "## Finished $(patsubst %-only,%,$@) (build time %s)\n\n" \

        "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_$(patsubst %-only,%,$@) | $(CUT) -f 1 -d " "`"

    $(call CheckIfMakeAtEnd)

endef

# Hook to be called as the very first thing when running a normal build

define AtMakeStart

    $(if $(findstring --jobserver,$(MAKEFLAGS)),$(error make -j is not supported, use make JOBS=n))

    $(call CheckEnvironment)

    @$(PRINTF) $(LOG_INFO) "Running make as '$(MAKE) $(MFLAGS) $(MAKE_ARGS)'\n"

    @$(PRINTF) "Building $(PRODUCT_NAME) for target '$(call GetRealTarget)' in configuration '$(CONF_NAME)'\n\n"

    $(call StartGlobalTimer)

endef

# Hook to be called as the very last thing for targets that are "top level" targets

define AtMakeEnd

    $(call StopGlobalTimer)

    $(call ReportBuildTimes)

    @$(PRINTF) "Finished building $(PRODUCT_NAME) for target '$(call GetRealTarget)'\n"

    $(call CheckEnvironment)

endef

### Functions for parsing and setting up make options from command-line

define FatalError

    # If the user specificed a "global" target (e.g. 'help'), do not exit but continue running

    $$(if $$(filter-out $(global_targets),$$(call GetRealTarget)),$$(error Cannot continue))

endef

define ParseLogLevel

    ifeq ($$(origin VERBOSE),undefined)

        # Setup logging according to LOG (but only if VERBOSE is not given)

        ifneq ($$(findstring nofile,$$(LOG)),)

          # Reset the build log wrapper, regardless of other values

          override BUILD_LOG_WRAPPER=

          # COMMA is defined in spec.gmk, but that is not included yet

          COMMA=,

          # First try to remove ",nofile" if it exists

          LOG_STRIPPED1=$$(subst $$(COMMA)nofile,,$$(LOG))

          # Otherwise just remove "nofile"

          LOG_STRIPPED2=$$(subst nofile,,$$(LOG_STRIPPED1))

          # We might have ended up with a leading comma. Remove it

          LOG_STRIPPED3=$$(strip $$(patsubst $$(COMMA)%,%,$$(LOG_STRIPPED2)))

          override LOG:=$$(LOG_STRIPPED3)

        endif

        ifeq ($$(LOG),)

            # Set LOG to "warn" as default if not set (and no VERBOSE given)

            override LOG=warn

        endif

        ifeq ($$(LOG),warn)

            VERBOSE=-s

        else ifeq ($$(LOG),info)

            VERBOSE=-s

        else ifeq ($$(LOG),debug)

            VERBOSE=

        else ifeq ($$(LOG),trace)

            VERBOSE=

        else

            $$(info Error: LOG must be one of: warn, info, debug or trace.)

            $$(eval $$(call FatalError))

        endif

    else

        ifneq ($$(LOG),)

            # We have both a VERBOSE and a LOG argument. This is OK only if this is a repeated call by ourselves,

            # but complain if this is the top-level make call.

            ifeq ($$(MAKELEVEL),0)

                $$(info Cannot use LOG=$$(LOG) and VERBOSE=$$(VERBOSE) at the same time. Choose one.)

                $$(eval $$(call FatalError))

            endif

        endif

    endif

endef

define ParseConfAndSpec

    ifneq ($$(filter-out $(global_targets),$$(call GetRealTarget)),)

        # If we only have global targets, no need to bother with SPEC or CONF

        ifneq ($$(origin SPEC),undefined)

            # We have been given a SPEC, check that it works out properly

            ifeq ($$(wildcard $$(SPEC)),)

                $$(info Cannot locate spec.gmk, given by SPEC=$$(SPEC))

                $$(eval $$(call FatalError))

            endif

            ifneq ($$(origin CONF),undefined)

                # We also have a CONF argument. This is OK only if this is a repeated call by ourselves,

                # but complain if this is the top-level make call.

                ifeq ($$(MAKELEVEL),0)

                    $$(info Cannot use CONF=$$(CONF) and SPEC=$$(SPEC) at the same time. Choose one.)

                    $$(eval $$(call FatalError))

                endif

            endif

            # ... OK, we're satisfied, we'll use this SPEC later on

        else

            # Find all spec.gmk files in the build output directory

            output_dir=$$(root_dir)/build

            all_spec_files=$$(wildcard $$(output_dir)/*/spec.gmk)

            ifeq ($$(all_spec_files),)

                $$(info No configurations found for $$(root_dir)! Please run configure to create a configuration.)

                $$(eval $$(call FatalError))

            endif

            # Extract the configuration names from the path

            all_confs=$$(patsubst %/spec.gmk,%,$$(patsubst $$(output_dir)/%,%,$$(all_spec_files)))

            ifneq ($$(origin CONF),undefined)

                # User have given a CONF= argument.

                ifeq ($$(CONF),)

                    # If given CONF=, match all configurations

                    matching_confs=$$(strip $$(all_confs))

                else

                    # Otherwise select those that contain the given CONF string

                    matching_confs=$$(strip $$(foreach var,$$(all_confs),$$(if $$(findstring $$(CONF),$$(var)),$$(var))))

                endif

                ifeq ($$(matching_confs),)

                    $$(info No configurations found matching CONF=$$(CONF))

                    $$(info Available configurations:)

                    $$(foreach var,$$(all_confs),$$(info * $$(var)))

                    $$(eval $$(call FatalError))

                else

                    ifeq ($$(words $$(matching_confs)),1)

                        $$(info Building '$$(matching_confs)' (matching CONF=$$(CONF)))

                    else

                        $$(info Building target '$(call GetRealTarget)' in the following configurations (matching CONF=$$(CONF)):)

                        $$(foreach var,$$(matching_confs),$$(info * $$(var)))

                    endif

                endif

                # Create a SPEC definition. This will contain the path to one or more spec.gmk files.

                SPEC=$$(addsuffix /spec.gmk,$$(addprefix $$(output_dir)/,$$(matching_confs)))

            else

                # No CONF or SPEC given, check the available configurations

                ifneq ($$(words $$(all_spec_files)),1)

                    $$(info No CONF given, but more than one configuration found in $$(output_dir).)

                    $$(info Available configurations:)

                    $$(foreach var,$$(all_confs),$$(info * $$(var)))

                    $$(info Please retry building with CONF=<config pattern> (or SPEC=<specfile>))

                    $$(eval $$(call FatalError))

                endif

                # We found exactly one configuration, use it

                SPEC=$$(strip $$(all_spec_files))

            endif

        endif

    endif

endef

### Convenience functions from Main.gmk

# Cleans the component given as $1

define CleanComponent

    @$(PRINTF) "Cleaning $1 build artifacts ..."

    @($(CD) $(OUTPUT_ROOT) && $(RM) -r $1)

    @$(PRINTF) " done\n"

endef

endif # _MAKEHELPERS_GMK