[solved]Loader stops working properly with more than ~80 .bin files

Haunebu123 · September 10, 2018, 4:29pm

so its going to work and we get a new loader?

jonne · September 10, 2018, 6:43pm

No. (edit: silly me, I mean yes it will work) The Link Time Optimization messes the vector table. @FManga : could you try the LTO option in Build options / Linker / All settings and see what you make of it ?

But, @Haunebu123, I optimized the living daylights out of the code without the LTO and I managed to shave 3000 bytes. So it is running. But it is slow, and now I am trying to find out why

FManga · September 10, 2018, 7:26pm

Can do. What does it do to the vector table?

jonne · September 10, 2018, 7:29pm

It does not respect the vector table. It overwrites all sort of stuff over it. edit : including the initial sp and pc

Haunebu123 · September 10, 2018, 7:39pm

wow, nice work @ “optimized the living daylights out of the Code”
keep it up

When do you think my 2 additional Pokittos going to be shipped?

jonne · September 10, 2018, 7:50pm

Tomorrow. Thanks for the order!

I’ll pick the most beautiful ones for you.

Haunebu123 · September 10, 2018, 8:10pm

Thank you an than they are going on the big journey from finland to germany, whoo

FManga · September 11, 2018, 12:04am

Looks like adding -Wl,--undefined=g_pfnVectors helps, but something else is missing now.

Edit: Oh, great… Compile with -Og and it works. This is going to be fun. >_<

Edit: One bug down:
PokittoClock.cpp, pt_count needs to be declared volatile. volatile uint32_t pt_count=0;
Now its getting stuck in the count down.

Edit: ~~No, wait. It only gets stuck in the emulator. It works on hardware.~~
It breaks on both, when a button is pressed.

Edit: Found it…
HWButtons.cpp: heldStates needs to be volatile. volatile uint8_t Pokitto::heldStates[NUM_BTN];

Looks like my test app works alright now.

jonne · September 11, 2018, 1:10pm

Almost ready

FManga · September 11, 2018, 1:33pm

Yay! Source! Now I can break stuff like never before!

Haunebu123 · September 11, 2018, 1:40pm

Verry impressive, cant wait to test it

Hanski · September 11, 2018, 2:12pm

I want to add python file load support to it

jonne · September 11, 2018, 2:16pm

I would like to add many things. But the space is tight.

Well, soon you can try it out yourself. Going to push it to the repo within 2 hours

FManga · September 11, 2018, 2:24pm

@jonne: 2 hours?

Summary


ifeq ($(shell echo $$OS),$$OS)
    MAKEDIR = if not exist "$(1)" mkdir "$(1)"
    RM = rmdir /S /Q "$(1)"
else
    MAKEDIR = '$(SHELL)' -c "mkdir -p \"$(1)\""
    RM = '$(SHELL)' -c "rm -rf \"$(1)\""
endif

OBJDIR := BUILD
SRCDIR := $(CURDIR)

.PHONY: clean

.SUFFIXES:
.SUFFIXES: .cpp .o

vpath %.cpp .
vpath %.c .
vpath %.h .

# Boiler-plate
###############################################################################
# Project settings

PROJECT := Loader

BPROJECT := BUILD/Loader

# Project settings
###############################################################################
# Objects and Paths

OBJECTS += BUILD/C64font.o
OBJECTS += BUILD/font8x8.o
OBJECTS += BUILD/font8x8ext.o
OBJECTS += BUILD/minibuttons.o
OBJECTS += BUILD/miniGFX.o
OBJECTS += BUILD/minijump.o
OBJECTS += BUILD/miniLCD.o
OBJECTS += BUILD/miniload.o
OBJECTS += BUILD/miniprint.o
OBJECTS += BUILD/PokittoLib/POKITTO_HW/iap.o
OBJECTS += BUILD/PokittoLib/POKITTO_CORE/PokittoDisk.o
OBJECTS += BUILD/PokittoLib/libpff/mmc.o
OBJECTS += BUILD/PokittoLib/libpff/pff.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/BusIn.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/BusInOut.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/BusOut.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/CAN.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/CallChain.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/Ethernet.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/FileBase.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/FileLike.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/FilePath.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/FileSystemLike.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/I2C.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/I2CSlave.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/InterruptIn.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/InterruptManager.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/LocalFileSystem.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/RawSerial.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/SPI.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/SPISlave.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/Serial.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/SerialBase.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/Stream.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/Ticker.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/Timeout.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/Timer.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/TimerEvent.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/assert.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/board.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/error.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/gpio.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/lp_ticker_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/mbed_interface.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/pinmap_common.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/retarget.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/rtc_time.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/semihost_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/ticker_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/us_ticker_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/common/wait_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/TOOLCHAIN_GCC_ARM/TARGET_LPC11U68/startup_LPC11U68.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/cmsis_nvic.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/system_LPC11U6x.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/gpio_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/gpio_irq_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/i2c_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/pinmap.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/pwmout_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/rtc_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/serial_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/sleep.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/spi_api.o
OBJECTS += BUILD/PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X/us_ticker.o

INCLUDE_PATHS += -I./.
INCLUDE_PATHS += -I./PokittoLib
INCLUDE_PATHS += -I./PokittoLib/POKITTO_CORE
INCLUDE_PATHS += -I./PokittoLib/POKITTO_HW
INCLUDE_PATHS += -I./PokittoLib/libpff
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/api
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/common
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/hal
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/cmsis
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/TOOLCHAIN_GCC_ARM
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/TOOLCHAIN_GCC_ARM/TARGET_LPC11U68
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TOOLCHAIN_GCC
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/hal
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP
INCLUDE_PATHS += -I./PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X

LIBRARY_PATHS :=
LIBRARIES :=
LINKER_SCRIPT ?= loader005.ld

# Objects and Paths
###############################################################################
# Tools and Flags

CDB :=

AS      = $(CDB)	 'arm-none-eabi-gcc' '-x' 'assembler-with-cpp' '-c' '-Wall' '-Wextra' '-Wno-unused-parameter' '-Wno-missing-field-initializers' '-fmessage-length=0' '-fno-exceptions' '-fno-builtin' '-ffunction-sections' '-fdata-sections' '-funsigned-char' '-MMD' '-fno-delete-null-pointer-checks' '-fomit-frame-pointer' '-Os' '-g1' '-DMBED_RTOS_SINGLE_THREAD' '-mcpu=cortex-m0plus' '-mthumb'
CC      = $(CDB)	 'arm-none-eabi-gcc' '-std=gnu89' '-c' '-Wall' '-Wextra' '-Wno-unused-parameter' '-Wno-missing-field-initializers' '-fmessage-length=0' '-fno-exceptions' '-fno-builtin' '-ffunction-sections' '-fdata-sections' '-funsigned-char' '-MMD' '-fno-delete-null-pointer-checks' '-fomit-frame-pointer' '-Os' '-g1' '-DMBED_RTOS_SINGLE_THREAD' '-mcpu=cortex-m0plus' '-mthumb'
CPP     = $(CDB)	 'arm-none-eabi-g++' '-std=gnu++98' '-fno-rtti' '-Wvla' '-c' '-Wall' '-Wextra' '-Wno-unused-parameter' '-Wno-missing-field-initializers' '-fmessage-length=0' '-fno-exceptions' '-fno-builtin' '-ffunction-sections' '-fdata-sections' '-funsigned-char' '-MMD' '-fno-delete-null-pointer-checks' '-fomit-frame-pointer' '-Os' '-g1' '-DMBED_RTOS_SINGLE_THREAD' '-mcpu=cortex-m0plus' '-mthumb'
LD      = $(CDB)	 'arm-none-eabi-gcc' '-Os'
ELF2BIN = 'arm-none-eabi-objcopy'
PREPROC = 'arm-none-eabi-cpp' '-E' '-P' '-Wl,--gc-sections' '-Wl,--wrap,_malloc_r' '-Wl,--wrap,_free_r' '-Wl,--wrap,_realloc_r' '-Wl,--wrap,_memalign_r' '-Wl,--wrap,_calloc_r' '-Wl,--wrap,exit' '-Wl,--wrap,atexit' '-Wl,-n' '--specs=nano.specs' '-mcpu=cortex-m0plus' '-mthumb'


C_FLAGS += -flto
CXX_FLAGS += -flto
C_FLAGS += -DMINILOADHIGH
CXX_FLAGS += -DMINILOADHIGH

C_FLAGS += -std=gnu89
C_FLAGS += -DTARGET_LPC11U68
C_FLAGS += -D__MBED__=1
C_FLAGS += -DDEVICE_I2CSLAVE=1
C_FLAGS += -DTARGET_LIKE_MBED
C_FLAGS += -DTARGET_NXP
C_FLAGS += -D__MBED_CMSIS_RTOS_CM
C_FLAGS += -DDEVICE_RTC=1
C_FLAGS += -DTOOLCHAIN_object
C_FLAGS += -D__CMSIS_RTOS
C_FLAGS += -DTOOLCHAIN_GCC
C_FLAGS += -DTARGET_CORTEX_M
C_FLAGS += -DTARGET_M0P
C_FLAGS += -DTARGET_UVISOR_UNSUPPORTED
C_FLAGS += -DMBED_BUILD_TIMESTAMP=1526086019.89
C_FLAGS += -DDEVICE_SERIAL=1
C_FLAGS += -DDEVICE_INTERRUPTIN=1
C_FLAGS += -DTARGET_LPCTarget
C_FLAGS += -DTARGET_CORTEX
C_FLAGS += -DDEVICE_I2C=1
C_FLAGS += -D__CORTEX_M0PLUS
C_FLAGS += -DTARGET_FF_ARDUINO
C_FLAGS += -DTARGET_RELEASE
C_FLAGS += -DARM_MATH_CM0PLUS
C_FLAGS += -DTARGET_LPC11U6X
C_FLAGS += -DDEVICE_SLEEP=1
C_FLAGS += -DTOOLCHAIN_GCC_ARM
C_FLAGS += -DDEVICE_SPI=1
C_FLAGS += -DDEVICE_ANALOGIN=1
C_FLAGS += -DDEVICE_PWMOUT=1
C_FLAGS += -DTARGET_LIKE_CORTEX_M0


CXX_FLAGS += -std=gnu++14
CXX_FLAGS += -fno-rtti
CXX_FLAGS += -Wvla
CXX_FLAGS += -DTARGET_LPC11U68
CXX_FLAGS += -D__MBED__=1
CXX_FLAGS += -DDEVICE_I2CSLAVE=1
CXX_FLAGS += -DTARGET_LIKE_MBED
CXX_FLAGS += -DTARGET_NXP
CXX_FLAGS += -D__MBED_CMSIS_RTOS_CM
CXX_FLAGS += -DDEVICE_RTC=1
CXX_FLAGS += -DTOOLCHAIN_object
CXX_FLAGS += -D__CMSIS_RTOS
CXX_FLAGS += -DTOOLCHAIN_GCC
CXX_FLAGS += -DTARGET_CORTEX_M
CXX_FLAGS += -DTARGET_M0P
CXX_FLAGS += -DTARGET_UVISOR_UNSUPPORTED
CXX_FLAGS += -DMBED_BUILD_TIMESTAMP=1526086019.89
CXX_FLAGS += -DDEVICE_SERIAL=1
CXX_FLAGS += -DDEVICE_INTERRUPTIN=1
CXX_FLAGS += -DTARGET_LPCTarget
CXX_FLAGS += -DTARGET_CORTEX
CXX_FLAGS += -DDEVICE_I2C=1
CXX_FLAGS += -D__CORTEX_M0PLUS
CXX_FLAGS += -DTARGET_FF_ARDUINO
CXX_FLAGS += -DTARGET_RELEASE
CXX_FLAGS += -DARM_MATH_CM0PLUS
CXX_FLAGS += -DTARGET_LPC11U6X
CXX_FLAGS += -DDEVICE_SLEEP=1
CXX_FLAGS += -DTOOLCHAIN_GCC_ARM
CXX_FLAGS += -DDEVICE_SPI=1
CXX_FLAGS += -DDEVICE_ANALOGIN=1
CXX_FLAGS += -DDEVICE_PWMOUT=1
CXX_FLAGS += -DTARGET_LIKE_CORTEX_M0

ASM_FLAGS += -x
ASM_FLAGS += assembler-with-cpp
ASM_FLAGS += -D__CMSIS_RTOS
ASM_FLAGS += -D__MBED_CMSIS_RTOS_CM
ASM_FLAGS += -D__CORTEX_M0PLUS
ASM_FLAGS += -DARM_MATH_CM0PLUS
ASM_FLAGS += -I./.
ASM_FLAGS += -I./PokittoLib
ASM_FLAGS += -I./PokittoLib/POKITTO_CORE
ASM_FLAGS += -I./PokittoLib/POKITTO_CORE/FONTS
ASM_FLAGS += -I./PokittoLib/POKITTO_CORE/PALETTES
ASM_FLAGS += -I./PokittoLib/POKITTO_HW
ASM_FLAGS += -I./PokittoLib/POKITTO_LIBS
ASM_FLAGS += -I./PokittoLib/POKITTO_LIBS/ImageFormat
ASM_FLAGS += -I./PokittoLib/POKITTO_LIBS/Synth
ASM_FLAGS += -I./PokittoLib/POKITTO_XTERNALS
ASM_FLAGS += -I./PokittoLib/POKITTO_XTERNALS/Arduino
ASM_FLAGS += -I./PokittoLib/libpff
ASM_FLAGS += -I./PokittoLib/mbed-pokitto
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/api
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/common
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/hal
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/cmsis
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/TOOLCHAIN_GCC_ARM
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/TOOLCHAIN_GCC_ARM/TARGET_LPC11U68
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/cmsis/TOOLCHAIN_GCC
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/hal
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP
ASM_FLAGS += -I./PokittoLib/mbed-pokitto/targets/hal/TARGET_NXP/TARGET_LPC11U6X


LD_FLAGS :=-Wl,--gc-sections -Wl,-n --specs=nano.specs -mcpu=cortex-m0plus -mthumb -flto -Wl,--undefined=g_pfnVectors
LD_SYS_LIBS :=-Wl,--start-group -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys  -Wl,--end-group

# Tools and Flags
###############################################################################
# Rules

.PHONY: all lst size


all: $(BPROJECT).bin $(BPROJECT).hex size
	+@$(call MAKEDIR,$(OBJDIR))


.s.o:
	+@$(call MAKEDIR,$(dir $@))
	+@echo "Assemble: $(notdir $<)"
	@$(AS) -c $(ASM_FLAGS) -o $@ $<


.S.o:
	+@$(call MAKEDIR,$(dir $@))
	+@echo "Assemble: $(notdir $<)"
	@$(AS) -c $(ASM_FLAGS) -o $@ $<

BUILD/%.o : %.c
	+@$(call MAKEDIR,$(dir $@))
	+@echo "Compile: $(notdir $<)"
	@$(CC) $(C_FLAGS) $(INCLUDE_PATHS) -o $@ $<

BUILD/%.o : %.cpp
	+@$(call MAKEDIR,$(dir $@))
	+@echo "Compile: $(notdir $<)"
	@$(CPP) $(CXX_FLAGS) $(INCLUDE_PATHS) -o $@ $<


$(BPROJECT).link_script.ld: $(LINKER_SCRIPT)
	@$(PREPROC) $< -o $@



$(BPROJECT).elf: $(OBJECTS) $(SYS_OBJECTS) $(BPROJECT).link_script.ld 
	+@echo "link: $(notdir $@)"
	@$(LD) $(LD_FLAGS) -T $(filter-out %.o, $^) $(LIBRARY_PATHS) --output $@ $(filter %.o, $^) $(LIBRARIES) $(LD_SYS_LIBS)


$(BPROJECT).bin: $(BPROJECT).elf
	$(ELF2BIN) -O binary $< $@
	+@echo "===== bin file ready to flash: $(OBJDIR)/$@ =====" 

$(BPROJECT).hex: $(BPROJECT).elf
	$(ELF2BIN) -O ihex $< $@


# Rules
###############################################################################
# Dependencies

DEPS = $(OBJECTS:.o=.d) $(SYS_OBJECTS:.o=.d)
-include $(DEPS)
# endif

# Dependencies
###############################################################################

clean :
	$(call RM,$(OBJDIR))

jonne · September 11, 2018, 2:27pm

There is already something but it does not have the latest tweaks.

The loader is harder to maintain than apps. I want to test it completely before release

FManga · September 11, 2018, 2:31pm

Hehe, I know. I noticed I had to use this for it to work:

unsigned char upHeld() { if ( UBtn ) return 1; return 0;}
unsigned char downHeld() { if ( DBtn ) return 1; return 0;}
unsigned char leftHeld() { if ( LBtn ) return 1; return 0;}
unsigned char rightHeld() { if ( RBtn ) return 1; return 0;}
unsigned char aHeld() { if ( ABtn ) return 1; return 0;}
unsigned char bHeld() { if ( BBtn ) return 1; return 0;}
unsigned char cHeld() { if ( CBtn ) return 1; return 0;}

Still, looks like it is much better than v4 already, so I don’t mind beta testing.

FManga · September 11, 2018, 2:38pm

You want to put the whole python interpreter in the loader? o_O

I’d like to make a “.pok” file that contains a bin and a header with a full name and a screenshot/title image. Short file names can get really confusing.

spinal · September 11, 2018, 2:54pm

Don’t forget a small icon…

jonne · September 11, 2018, 3:23pm

Aaand we also now have automatic sorting!

tumblr_llo6cv7fck1qfiwl0

EDIT:

it works! and is blistering fast too. You do not see any difference in boot up time

Pharap · September 11, 2018, 3:46pm

Like the Arduboy’s .arduboy files.

I’d rather have something like YAML or .ini than .json though.
Something less strict and easier to write a parser for.