#
# Copyright (c) 2011, 2015, 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 Init.gmk.
# It is divided in two parts, depending on if a SPEC is present or not
# (HAS_SPEC is true or not).
################################################################################

ifndef _INITSUPPORT_GMK
_INITSUPPORT_GMK := 1

# Setup information about available configurations, if any.
build_dir=$(topdir)/build
all_spec_files=$(wildcard $(build_dir)/*/spec.gmk)
# Extract the configuration names from the path
all_confs=$(patsubst %/spec.gmk, %, $(patsubst $(build_dir)/%, %, $(all_spec_files)))
any_spec_file=$(firstword $(all_spec_files))

ifeq ($(HAS_SPEC),)
  ##############################################################################
  # Helper functions for the initial part of Init.gmk, before the spec file is
  # loaded. Most of these functions provide parsing and setting up make options
  # from the command-line.
  ##############################################################################

  # Make control variables, handled by Init.gmk
  INIT_CONTROL_VARIABLES := LOG CONF SPEC JOBS CONF_CHECK

  # All known make control variables
  MAKE_CONTROL_VARIABLES := $(INIT_CONTROL_VARIABLES) TEST JDK_FILTER

  # Define a simple reverse function.
  # Should maybe move to MakeBase.gmk, but we can't include that file now.
  reverse = \
      $(if $(strip $(1)), $(call reverse, $(wordlist 2, $(words $(1)), $(1)))) \
          $(firstword $(1))

  # The variable MAKEOVERRIDES contains variable assignments from the command
  # line, but in reverse order to what the user entered.
  COMMAND_LINE_VARIABLES := $(subst \#,\ , $(call reverse, $(subst \ ,\#,$(MAKEOVERRIDES))))

  # A list like FOO="val1" BAR="val2" containing all user-supplied make variables
  # that we should propagate.
  USER_MAKE_VARS := $(filter-out $(addsuffix =%, $(INIT_CONTROL_VARIABLES)), \
      $(MAKEOVERRIDES))

  # Check for unknown command-line variables
  define CheckControlVariables
    command_line_variables := $$(strip $$(foreach var, \
        $$(subst \ ,_,$$(MAKEOVERRIDES)), \
        $$(firstword $$(subst =, , $$(var)))))
    unknown_command_line_variables := $$(strip $$(filter-out $$(MAKE_CONTROL_VARIABLES), $$(command_line_variables)))
    ifneq ($$(unknown_command_line_variables), )
      $$(info Note: Command line contains non-control variables:)
      $$(foreach var, $$(unknown_command_line_variables), $$(info * $$(var)=$$($$(var))))
      $$(info Make sure it is not mistyped, and that you intend to override this variable.)
      $$(info 'make help' will list known control variables.)
      $$(info )
    endif
  endef

  # Check for deprecated ALT_ variables
  define CheckDeprecatedEnvironment
    defined_alt_variables := $$(filter ALT_%, $$(.VARIABLES))
    ifneq ($$(defined_alt_variables), )
      $$(info Warning: You have the following ALT_ variables set:)
      $$(foreach var, $$(defined_alt_variables), $$(info * $$(var)=$$($$(var))))
      $$(info ALT_ variables are deprecated, and may result in a failed build.)
      $$(info Please clean your environment.)
      $$(info )
    endif
  endef

  # Check for invalid make flags like -j
  define CheckInvalidMakeFlags
    # This is a trick to get this rule to execute before any other rules
    # MAKEFLAGS only indicate -j if read in a recipe (!)
    $$(topdir)/make/Init.gmk: .FORCE
	$$(if $$(findstring --jobserver, $$(MAKEFLAGS)), \
	    $$(info Error: 'make -jN' is not supported, use 'make JOBS=N') \
	    $$(error Cannot continue) \
	)
    .FORCE:
    .PHONY: .FORCE
  endef

  # Check that the CONF_CHECK option is valid and set up handling
  define ParseConfCheckOption
    ifeq ($$(CONF_CHECK), )
      # Default behavior is fail
      CONF_CHECK := fail
    else ifneq ($$(filter-out auto fail ignore, $$(CONF_CHECK)),)
      $$(info Error: CONF_CHECK must be one of: auto, fail or ignore.)
      $$(error Cannot continue)
    endif
  endef

  define ParseLogLevel
    # Catch old-style VERBOSE= command lines.
    ifneq ($$(origin VERBOSE), undefined)
      $$(info Error: VERBOSE is deprecated. Use LOG=<warn|info|debug|trace> instead.)
      $$(error Cannot continue)
    endif

    # Setup logging according to LOG

    # If the "nofile" argument is given, act on it and strip it away
    ifneq ($$(findstring nofile, $$(LOG)),)
      LOG_NOFILE := true
      # COMMA is defined in spec.gmk, but that is not included yet
      COMMA := ,
      # First try to remove ",nofile" if it exists, otherwise just remove "nofile"
      LOG_STRIPPED := $$(subst nofile,, $$(subst $$(COMMA)nofile,, $$(LOG)))
      # We might have ended up with a leading comma. Remove it
      LOG_LEVEL := $$(strip $$(patsubst $$(COMMA)%, %, $$(LOG_STRIPPED)))
    else
      LOG_LEVEL := $$(LOG)
    endif

    ifeq ($$(LOG_LEVEL),)
      # Set LOG to "warn" as default if not set
      LOG_LEVEL := warn
    endif

    ifeq ($$(LOG_LEVEL), warn)
      MAKE_LOG_FLAGS := -s
    else ifeq ($$(LOG_LEVEL), info)
      MAKE_LOG_FLAGS := -s
    else ifeq ($$(LOG_LEVEL), debug)
      MAKE_LOG_FLAGS :=
    else ifeq ($$(LOG_LEVEL), trace)
      MAKE_LOG_FLAGS := -d
    else
      $$(info Error: LOG must be one of: warn, info, debug or trace.)
      $$(error Cannot continue)
    endif
  endef

  define ParseConfAndSpec
    ifneq ($$(origin SPEC), undefined)
      # We have been given a SPEC, check that it works out properly
      ifneq ($$(origin CONF), undefined)
        # We also have a CONF argument. We can't have both.
        $$(info Error: Cannot use CONF=$$(CONF) and SPEC=$$(SPEC) at the same time. Choose one.)
        $$(error Cannot continue)
      endif
      ifeq ($$(wildcard $$(SPEC)),)
        $$(info Error: Cannot locate spec.gmk, given by SPEC=$$(SPEC).)
        $$(error Cannot continue)
      endif
      ifeq ($$(filter /%, $$(SPEC)),)
        # If given with relative path, make it absolute
        SPECS := $$(CURDIR)/$$(strip $$(SPEC))
      else
        SPECS := $$(SPEC)
      endif

      # For now, unset this SPEC variable.
      override SPEC :=
    else
      # Use spec.gmk files in the build output directory
      ifeq ($$(any_spec_file),)
        $$(info Error: No configurations found for $$(topdir).)
        $$(info Please run 'bash configure' to create a configuration.)
        $$(info )
        $$(error Cannot continue)
      endif

      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 Error: No configurations found matching CONF=$$(CONF).)
          $$(info Available configurations in $$(build_dir):)
          $$(foreach var, $$(all_confs), $$(info * $$(var)))
          $$(error Cannot continue)
        else
          ifeq ($$(words $$(matching_confs)), 1)
            $$(info Building configuration '$$(matching_confs)' (matching CONF=$$(CONF)))
          else
            $$(info Building these 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.
        SPECS := $$(addsuffix /spec.gmk, $$(addprefix $$(build_dir)/, $$(matching_confs)))
      else
        # No CONF or SPEC given, check the available configurations
        ifneq ($$(words $$(all_spec_files)), 1)
          $$(info Error: No CONF given, but more than one configuration found.)
          $$(info Available configurations in $$(build_dir):)
          $$(foreach var, $$(all_confs), $$(info * $$(var)))
          $$(info Please retry building with CONF=<config pattern> (or SPEC=<spec file>).)
          $$(info )
          $$(error Cannot continue)
        endif

        # We found exactly one configuration, use it
        SPECS := $$(strip $$(all_spec_files))
      endif
    endif
  endef

  define PrintConfCheckFailed
	@echo ' '
	@echo "Please rerun configure! Easiest way to do this is by running"
	@echo "'make reconfigure'."
	@echo "This behavior may also be changed using CONF_CHECK=<ignore|auto>."
	@echo ' '
  endef

else # $(HAS_SPEC)=true
  ##############################################################################
  # Helper functions for the 'main' target. These functions assume a single,
  # proper and existing SPEC is provided, and will load it.
  ##############################################################################

  include $(SPEC)
  include $(SRC_ROOT)/make/common/MakeBase.gmk

  # Define basic logging setup
  BUILD_LOG := $(OUTPUT_ROOT)/build.log
  BUILD_TRACE_LOG := $(OUTPUT_ROOT)/build-trace-time.log

  BUILD_LOG_WRAPPER := $(BASH) $(SRC_ROOT)/common/bin/logger.sh $(BUILD_LOG)

  # Disable the build log wrapper on sjavac+windows until
  # we have solved how to prevent the log wrapper to wait
  # for the background sjavac server process.
  ifeq ($(ENABLE_SJAVAC)X$(OPENJDK_BUILD_OS),yesXwindows)
    LOG_NOFILE := true
  endif

  # Sanity check the spec file, so it matches this source code
  define CheckSpecSanity
    ifneq ($$(topdir), $$(TOPDIR))
      ifneq ($$(topdir), $$(ORIGINAL_TOPDIR))
        ifneq ($$(topdir), $$(CANONICAL_TOPDIR))
          $$(info Error: SPEC mismatch! Current working directory)
          $$(info $$(topdir))
          $$(info does not match either TOPDIR, ORIGINAL_TOPDIR or CANONICAL_TOPDIR)
          $$(info $$(TOPDIR))
          $$(info $$(ORIGINAL_TOPDIR))
          $$(info $$(CANONICAL_TOPDIR))
          $$(error Cannot continue)
        endif
      endif
    endif
  endef

  define RotateLogFiles
	$(RM) $(BUILD_LOG).old 2> /dev/null
	$(MV) $(BUILD_LOG) $(BUILD_LOG).old 2> /dev/null || true
	$(if $(findstring trace, $(LOG_LEVEL)), \
	  $(RM) $(BUILD_TRACE_LOG).old 2> /dev/null && \
	  $(MV) $(BUILD_TRACE_LOG) $(BUILD_TRACE_LOG).old 2> /dev/null || true \
	)
  endef

  # Remove any javac server logs and port files. This
  # prevents a new make run to reuse the previous servers.
  define PrepareSmartJavac
	$(if $(SJAVAC_SERVER_DIR), \
	  $(RM) -r $(SJAVAC_SERVER_DIR) 2> /dev/null && \
	  $(MKDIR) -p $(SJAVAC_SERVER_DIR) \
	)
  endef

  define CleanupSmartJavac
	[ -f $(SJAVAC_SERVER_DIR)/server.port ] && $(ECHO) Stopping sjavac server && \
	    $(TOUCH) $(SJAVAC_SERVER_DIR)/server.port.stop; true
  endef

  define StartGlobalTimer
	$(RM) -r $(BUILDTIMESDIR) 2> /dev/null
	$(MKDIR) -p $(BUILDTIMESDIR)
	$(call RecordStartTime,TOTAL)
  endef

  define StopGlobalTimer
	$(call RecordEndTime,TOTAL)
  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) $(LOG_INFO) -- \
	    "----- Build times -------\nStart %s\nEnd   %s\n%s\n%s\n-------------------------\n" \
	    "`$(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

endif # HAS_SPEC

endif # _INITSUPPORT_GMK