Forth

.gitmodules

@@ -89,3 +89,6 @@
 [submodule "vendor/lpeg"]
 	path = vendor/lpeg
 	url = https://github.com/roberto-ieru/LPeg.git
+[submodule "vendor/pforth"]
+	path = vendor/pforth
+	url = https://github.com/philburk/pforth.git

CMakeLists.txt

@@ -179,6 +179,7 @@ include(cmake/squirrel.cmake)
 include(cmake/pocketpy.cmake)
 include(cmake/quickjs.cmake)
 include(cmake/janet.cmake)
+include(cmake/forth.cmake)
 
 include(cmake/core.cmake)
 include(cmake/wave.cmake)

assets.bat

@@ -20,6 +20,7 @@ build\bin\prj2cart demos\schemedemo.scm build\schemedemo.tic
 build\bin\prj2cart demos\sfx.lua build\sfx.tic
 build\bin\prj2cart demos\squirreldemo.nut build\squirreldemo.tic
 build\bin\prj2cart demos\tetris.lua build\tetris.tic
+build\bin\prj2cart demos\forthdemo.fth build\forthdemo.tic
 build\bin\prj2cart demos\wrendemo.wren build\wrendemo.tic
 build\bin\prj2cart demos\yuedemo.yue build\yuedemo.tic
 
@@ -59,6 +60,7 @@ build\bin\bin2txt build\schemedemo.tic build\assets\schemedemo.tic.dat -z
 build\bin\bin2txt build\sfx.tic build\assets\sfx.tic.dat -z
 build\bin\bin2txt build\squirreldemo.tic build\assets\squirreldemo.tic.dat -z
 build\bin\bin2txt build\tetris.tic build\assets\tetris.tic.dat -z
+build\bin\bin2txt build\forthdemo.tic build\assets\forthdemo.tic.dat -z
 build\bin\bin2txt build\wrendemo.tic build\assets\wrendemo.tic.dat -z
 build\bin\bin2txt build\janetmark.tic build\assets\janetmark.tic.dat -z
 build\bin\bin2txt build\jsmark.tic build\assets\jsmark.tic.dat -z

build/assets/forthdemo.tic.dat

@@ -0,0 +1 @@
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build/baremetalpi/Makefile

@@ -25,6 +25,7 @@ CFLAGS += -I "$(NEWLIBDIR)/include" -I $(STDDEF_INCPATH) -I $(CIRCLESTDLIB)/incl
 LIBS :=  \
     $(TIC80LIB)/libtic80studio.a \
     $(TIC80LIB)/libtic80core.a \
+    $(TIC80LIB)/libforth.a \
     $(TIC80LIB)/libgiflib.a \
     $(TIC80LIB)/liblpeg.a \
     $(TIC80LIB)/libluaapi.a \

cmake/core.cmake

@@ -113,6 +113,10 @@ if(BUILD_STATIC)
         target_link_libraries(tic80core PRIVATE wasm)
     endif()
 
+    if(BUILD_WITH_FORTH)
+        target_link_libraries(tic80core PRIVATE forth)
+    endif()
+
     target_link_libraries(tic80core PRIVATE runtime)
 
 endif()

cmake/forth.cmake

@@ -0,0 +1,139 @@
+################################
+# Forth (pForth)
+################################
+
+option(BUILD_WITH_FORTH "Forth Enabled" ${BUILD_WITH_ALL})
+message("BUILD_WITH_FORTH: ${BUILD_WITH_FORTH}")
+
+if(BUILD_WITH_FORTH)
+
+    set(PFORTH_DIR ${THIRDPARTY_DIR}/pforth/csrc)
+    set(PFORTH_FTH_DIR ${THIRDPARTY_DIR}/pforth/fth)
+
+    # -------------------------------------------------------------------------
+    # pforth C sources — all files from sources.cmake, excluding the default
+    # pfcustom.c (our forth.c serves as the replacement).
+    # -------------------------------------------------------------------------
+    set(PFORTH_KERNEL_SOURCES
+        ${PFORTH_DIR}/pf_cglue.c
+        ${PFORTH_DIR}/pf_clib.c
+        ${PFORTH_DIR}/pf_core.c
+        ${PFORTH_DIR}/pf_inner.c
+        ${PFORTH_DIR}/pf_io.c
+        ${PFORTH_DIR}/pf_io_none.c
+        ${PFORTH_DIR}/pf_mem.c
+        ${PFORTH_DIR}/pf_save.c
+        ${PFORTH_DIR}/pf_text.c
+        ${PFORTH_DIR}/pf_words.c
+        ${PFORTH_DIR}/pfcompil.c
+        ${PFORTH_DIR}/paging/pagedmem.c
+        ${PFORTH_DIR}/paging/lockpage.c
+        ${PFORTH_DIR}/paging/qadmpage.c
+    )
+
+    # -------------------------------------------------------------------------
+    # pfdicdat.h — pre-compiled standard dictionary for pforth.
+    # Cell size (32 vs 64 bit) must match the target platform:
+    #   cmake/pfdicdat.h     — 64-bit (x86-64, ARM64, …)
+    #   cmake/pfdicdat_32.h  — 32-bit (WASM/Emscripten, 32-bit ARM, …)
+    # To regenerate after updating pforth:
+    #   64-bit: cd vendor/pforth && cmake . && make pforth_dic_header
+    #           cp vendor/pforth/csrc/pfdicdat.h cmake/pfdicdat.h
+    #   32-bit: cmake -DCMAKE_C_COMPILER=gcc-13 -DCMAKE_C_FLAGS=-m32 \
+    #                 -DCMAKE_CXX_COMPILER_WORKS=TRUE \
+    #                 -S vendor/pforth -B /tmp/pf32 && \
+    #           cmake --build /tmp/pf32 --target pforth_dic_header && \
+    #           cp vendor/pforth/csrc/pfdicdat.h cmake/pfdicdat_32.h
+    # -------------------------------------------------------------------------
+    set(PFORTH_DICDAT ${PFORTH_DIR}/pfdicdat.h)
+
+    # Use the 32-bit dictionary only for Emscripten/WASM; all other targets
+    # (including 32-bit ARM like 3DS or RPI) use the 64-bit dictionary as
+    # a fallback — those builds were already broken before this change.
+    if(EMSCRIPTEN)
+        set(_PFORTH_DICDAT_BUNDLED "${CMAKE_SOURCE_DIR}/cmake/pfdicdat_32.h")
+    else()
+        set(_PFORTH_DICDAT_BUNDLED "${CMAKE_SOURCE_DIR}/cmake/pfdicdat.h")
+    endif()
+
+    if(NOT EXISTS ${PFORTH_DICDAT})
+        if(EXISTS ${_PFORTH_DICDAT_BUNDLED})
+            message(STATUS "Forth: copying bundled ${_PFORTH_DICDAT_BUNDLED} to ${PFORTH_DICDAT}")
+            configure_file(${_PFORTH_DICDAT_BUNDLED} ${PFORTH_DICDAT} COPYONLY)
+        else()
+            message(STATUS "Forth: pfdicdat.h not found — bootstrapping pforth to generate it...")
+            set(_PFORTH_BOOTSTRAP_DIR "${CMAKE_BINARY_DIR}/pforth_bootstrap")
+            execute_process(
+                COMMAND ${CMAKE_COMMAND} -G "Unix Makefiles"
+                        -DCMAKE_CXX_COMPILER_WORKS=TRUE
+                        -S "${THIRDPARTY_DIR}/pforth" -B "${_PFORTH_BOOTSTRAP_DIR}"
+                RESULT_VARIABLE _pforth_cfg_result
+            )
+            execute_process(
+                COMMAND ${CMAKE_COMMAND} --build "${_PFORTH_BOOTSTRAP_DIR}"
+                        --target pforth_dic_header
+                RESULT_VARIABLE _pforth_build_result
+            )
+            if(NOT EXISTS ${PFORTH_DICDAT})
+                message(FATAL_ERROR
+                    "Forth: failed to generate pfdicdat.h at ${PFORTH_DICDAT}.\n"
+                    "Try manually: cd ${THIRDPARTY_DIR}/pforth && cmake . && make pforth_dic_header\n"
+                    "Then: cp ${THIRDPARTY_DIR}/pforth/csrc/pfdicdat.h ${_PFORTH_DICDAT_BUNDLED}")
+            endif()
+            message(STATUS "Forth: pfdicdat.h generated successfully")
+        endif()
+    endif()
+
+    # -------------------------------------------------------------------------
+    # forthdemo.tic.dat — demo cartridge for 'new forth' command.
+    # Source: demos/forthdemo.fth
+    # Regenerate (after building prj2cart and bin2txt):
+    #   prj2cart demos/forthdemo.fth /tmp/forthdemo.tic
+    #   bin2txt  /tmp/forthdemo.tic build/assets/forthdemo.tic.dat -z
+    # -------------------------------------------------------------------------
+
+    # -------------------------------------------------------------------------
+    # TIC-80 forth library
+    # -------------------------------------------------------------------------
+    set(FORTH_SRC
+        ${PFORTH_KERNEL_SOURCES}
+        ${CMAKE_SOURCE_DIR}/src/api/forth.c
+        ${CMAKE_SOURCE_DIR}/src/api/forth_io.c
+        ${CMAKE_SOURCE_DIR}/src/api/parse_note.c
+    )
+
+    add_library(forth ${TIC_RUNTIME} ${FORTH_SRC})
+
+    if(NOT BUILD_STATIC)
+        set_target_properties(forth PROPERTIES PREFIX "")
+    endif()
+
+    target_compile_definitions(forth INTERFACE TIC_BUILD_WITH_FORTH=1)
+
+    target_compile_definitions(forth PRIVATE
+        PF_STATIC_DIC       # load the pre-compiled dictionary from pfdicdat.h
+        PF_SUPPORT_FP       # enable floating-point word set
+        PF_NO_FILEIO        # stub out file I/O (no filesystem in cartridges)
+        PF_DEMAND_PAGING=0
+    )
+
+
+    target_link_libraries(forth PRIVATE runtime)
+
+    target_include_directories(forth
+        PRIVATE
+            # pfdicdat.h lives here; must come before any other include that
+            # could shadow it.
+            ${PFORTH_DIR}
+            ${CMAKE_SOURCE_DIR}/include
+            ${CMAKE_SOURCE_DIR}/src
+    )
+
+    # Suppress warnings from pforth's own C files to avoid noise in TIC-80
+    # build logs (pforth was not written to match TIC-80's warning flags).
+    foreach(SRC ${PFORTH_KERNEL_SOURCES})
+        set_source_files_properties(${SRC} PROPERTIES COMPILE_FLAGS
+            "-w")
+    endforeach()
+
+endif(BUILD_WITH_FORTH)