Image.mk file Regarding the firmware generation, I would like to know

Where does Build/Compile defined?
Where does Build/Clean defined?
I've been looking for a long time but couldn't find it

 ifeq ($(IB),)
    .PHONY: download prepare compile compile-dtb clean image_prepare kernel_prepare install install-images
    compile:
		$(call Build/Compile)  ##Where does Build/Compile defined?

    clean:
		$(call Build/Clean)  ## Where does Build/Clean defined?

    compile-dtb:
    image_prepare: compile compile-dtb
		mkdir -p $(BIN_DIR) $(KDIR)/tmp
		rm -rf $(BUILD_DIR)/json_info_files
		$(call Image/Prepare)

  else
    image_prepare:
		rm -rf $(KDIR)/tmp
		mkdir -p $(BIN_DIR) $(KDIR)/tmp
  endif