From 67b2a5eef2b815d3ab1f459e7f75374f2deeb59a Mon Sep 17 00:00:00 2001
From: matiasvlevi <matiasvlevi@gmail.com>
Date: Mon, 30 Sep 2024 19:48:46 -0400
Subject: [PATCH] wasm build

---
 .gitignore |   2 +
 linit.c    |   2 +
 makefile   | 204 ++++++++++++++++++++++++++++++++++++-----------------
 3 files changed, 143 insertions(+), 65 deletions(-)

diff --git a/.gitignore b/.gitignore
index ae2899e0..d5ed783b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,8 @@
 *.so
 *.o
 *.a
+*.o.wasm
+*.a.wasm
 
 manual/manual.html
 
diff --git a/linit.c b/linit.c
index 69808f84..4658bd8d 100644
--- a/linit.c
+++ b/linit.c
@@ -44,8 +44,10 @@ static const luaL_Reg loadedlibs[] = {
   {LUA_LOADLIBNAME, luaopen_package},
   {LUA_COLIBNAME, luaopen_coroutine},
   {LUA_TABLIBNAME, luaopen_table},
+#ifndef LUA_WASM
   {LUA_IOLIBNAME, luaopen_io},
   {LUA_OSLIBNAME, luaopen_os},
+#endif
   {LUA_STRLIBNAME, luaopen_string},
   {LUA_MATHLIBNAME, luaopen_math},
   {LUA_UTF8LIBNAME, luaopen_utf8},
diff --git a/makefile b/makefile
index 38e21f1f..085fd008 100644
--- a/makefile
+++ b/makefile
@@ -2,6 +2,30 @@
 # see luaconf.h for further customization
 
 # == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================
+PLATFORM ?= linux
+RM= rm -f
+
+ifeq ($(PLATFORM), wasm)
+# Wasm settings
+
+# Path to the WASI SDK
+WASI_SDK_PATH ?= /opt/wasi-sdk-24
+CC = $(WASI_SDK_PATH)/bin/clang
+AR = $(WASI_SDK_PATH)/bin/llvm-ar
+AR_OPT=rcs
+RANLIB = $(WASI_SDK_PATH)/bin/llvm-ranlib
+CFLAGS =\
+	-mllvm -wasm-enable-sjlj\
+	--target=wasm32-wasi\
+	--sysroot=$(WASI_SDK_PATH)/share/wasi-sysroot\
+	-I$(WASI_SDK_PATH)/share/wasi-sysroot/include\
+	-D_WASI_EMULATED_SIGNAL\
+	-D_WASI_EMULATED_PROCESS_CLOCKS\
+	-DLUA_USE_C89\
+	-DLUA_WASM\
+
+else 
+# Native settings
 
 # Warnings valid for both C and C++
 CWARNSCPP= \
@@ -13,16 +37,7 @@ CWARNSCPP= \
 	-Wredundant-decls \
 	-Wdisabled-optimization \
 	-Wdouble-promotion \
-	-Wmissing-declarations \
-        # the next warnings might be useful sometimes,
-	# but usually they generate too much noise
-	# -Werror \
-	# -pedantic   # warns if we use jump tables \
-	# -Wconversion  \
-	# -Wsign-conversion \
-	# -Wstrict-overflow=2 \
-	# -Wformat=2 \
-	# -Wcast-qual \
+	-Wmissing-declarations
 
 
 # Warnings for gcc, not valid for clang
@@ -39,53 +54,21 @@ CWARNSC= -Wdeclaration-after-statement \
 	-Wc++-compat \
 	-Wold-style-definition \
 
-
 CWARNS= $(CWARNSCPP) $(CWARNSC) $(CWARNGCC)
 
-# Some useful compiler options for internal tests:
-# -DLUAI_ASSERT turns on all assertions inside Lua.
-# -DHARDSTACKTESTS forces a reallocation of the stack at every point where
-# the stack can be reallocated.
-# -DHARDMEMTESTS forces a full collection at all points where the collector
-# can run.
-# -DEMERGENCYGCTESTS forces an emergency collection at every single allocation.
-# -DEXTERNMEMCHECK removes internal consistency checking of blocks being
-# deallocated (useful when an external tool like valgrind does the check).
-# -DMAXINDEXRK=k limits range of constants in RK instruction operands.
-# -DLUA_COMPAT_5_3
-
-# -pg -malign-double
-# -DLUA_USE_CTYPE -DLUA_USE_APICHECK
-
-# The following options help detect "undefined behavior"s that seldom
-# create problems; some are only available in newer gcc versions. To
-# use some of them, we also have to define an environment variable
-# ASAN_OPTIONS="detect_invalid_pointer_pairs=2".
-# -fsanitize=undefined
-# -fsanitize=pointer-subtract -fsanitize=address -fsanitize=pointer-compare
-# TESTS= -DLUA_USER_H='"ltests.h"' -O0 -g
-
-
-LOCAL = $(TESTS) $(CWARNS)
-
-
-# enable Linux goodies
-MYCFLAGS= $(LOCAL) -std=c99 -DLUA_USE_LINUX -DLUA_USE_READLINE
-MYLDFLAGS= $(LOCAL) -Wl,-E
+MYCFLAGS= $(CWARNS) -std=c99 -DLUA_USE_LINUX -DLUA_USE_READLINE
+MYLDFLAGS= $(CWARNS) -Wl,-E
 MYLIBS= -ldl -lreadline
 
-
 CC= gcc
 CFLAGS= -Wall -O2 $(MYCFLAGS) -fno-stack-protector -fno-common -march=native
-AR= ar rc
+AR= ar
+AR_OPT=rc
 RANLIB= ranlib
-RM= rm -f
-
-
+endif
 
 # == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
 
-
 LIBS = -lm
 
 CORE_T=	liblua.a
@@ -93,54 +76,144 @@ CORE_O=	lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o \
 	lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o \
 	ltm.o lundump.o lvm.o lzio.o ltests.o
 AUX_O=	lauxlib.o
-LIB_O=	lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o lstrlib.o \
+LIB_O=	lbaselib.o ldblib.o lmathlib.o ltablib.o lstrlib.o \
 	lutf8lib.o loadlib.o lcorolib.o linit.o
 
-LUA_T=	lua
-LUA_O=	lua.o
+ifeq ($(PLATFORM), wasm)
 
+# Append .wasm extention to objects
+CORE_O := $(CORE_O:.o=.o.wasm)
+AUX_O  := $(AUX_O:.o=.o.wasm)
+LIB_O  := $(LIB_O:.o=.o.wasm)
+CORE_T := $(CORE_T:.a=.a.wasm)
 
-ALL_T= $(CORE_T) $(LUA_T)
-ALL_O= $(CORE_O) $(LUA_O) $(AUX_O) $(LIB_O)
+# implicit rule for .wasm objects
+%.o.wasm: %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+%.wat: %.o.wasm
+	wasm2wat --enable-all $^ -o $@
+
+else
+
+# Add os related libs
+LIB_O += liolib.o loslib.o
+
+endif
+
+ALL_O= $(CORE_O) $(AUX_O) $(LIB_O)
+ALL_WAT=$(ALL_O:.o.wasm=.wat)
 ALL_A= $(CORE_T)
 
-all:	$(ALL_T)
+
+all: $(ALL_A)
 	touch all
 
 o:	$(ALL_O)
+	@echo $(ALL_O)
 
 a:	$(ALL_A)
+	@echo $(ALL_A)
 
-$(CORE_T): $(CORE_O) $(AUX_O) $(LIB_O)
-	$(AR) $@ $?
+$(CORE_T): $(ALL_O)
+	$(AR) $(AR_OPT) $@ $?
 	$(RANLIB) $@
 
-$(LUA_T): $(LUA_O) $(CORE_T)
-	$(CC) -o $@ $(MYLDFLAGS) $(LUA_O) $(CORE_T) $(LIBS) $(MYLIBS) $(DL)
-
-
 clean:
-	$(RM) $(ALL_T) $(ALL_O)
+	$(RM) $(ALL_O) $(ALL_WAT) $(ALL_A)
+
+ifeq ($(PLATFORM), wasm)
+
+wat: $(ALL_WAT) 
+	@echo $(ALL_WAT)
 
+depend:
+	@$(CC) $(CFLAGS) -MM *.c > .d
+	@sed -e 's/\.o:/.o.wasm:/' .d
+else
 depend:
 	@$(CC) $(CFLAGS) -MM *.c
+endif	
 
 echo:
 	@echo "CC = $(CC)"
 	@echo "CFLAGS = $(CFLAGS)"
 	@echo "AR = $(AR)"
+	@echo "AR_OPT = $(AR_OPT)"
 	@echo "RANLIB = $(RANLIB)"
 	@echo "RM = $(RM)"
-	@echo "MYCFLAGS = $(MYCFLAGS)"
-	@echo "MYLDFLAGS = $(MYLDFLAGS)"
-	@echo "MYLIBS = $(MYLIBS)"
-	@echo "DL = $(DL)"
 
 $(ALL_O): makefile ltests.h
 
 # DO NOT EDIT
 # automatically made with 'gcc -MM l*.c'
-
+ifeq ($(PLATFORM), wasm)
+lapi.o.wasm: lapi.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
+ lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lstring.h \
+ ltable.h lundump.h lvm.h
+lauxlib.o.wasm: lauxlib.c lprefix.h lua.h luaconf.h lauxlib.h
+lbaselib.o.wasm: lbaselib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lcode.o.wasm: lcode.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \
+ llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \
+ ldo.h lgc.h lstring.h ltable.h lvm.h
+lcorolib.o.wasm: lcorolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lctype.o.wasm: lctype.c lprefix.h lctype.h lua.h luaconf.h llimits.h
+ldblib.o.wasm: ldblib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+ldebug.o.wasm: ldebug.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
+ lobject.h ltm.h lzio.h lmem.h lcode.h llex.h lopcodes.h lparser.h \
+ ldebug.h ldo.h lfunc.h lstring.h lgc.h ltable.h lvm.h
+ldo.o.wasm: ldo.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
+ lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lopcodes.h \
+ lparser.h lstring.h ltable.h lundump.h lvm.h
+ldump.o.wasm: ldump.c lprefix.h lua.h luaconf.h lobject.h llimits.h lstate.h \
+ ltm.h lzio.h lmem.h lundump.h
+lfunc.o.wasm: lfunc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
+ llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h
+lgc.o.wasm: lgc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
+ llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h
+linit.o.wasm: linit.c lprefix.h lua.h luaconf.h lualib.h lauxlib.h
+liolib.o.wasm: liolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+llex.o.wasm: llex.c lprefix.h lua.h luaconf.h lctype.h llimits.h ldebug.h \
+ lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lgc.h llex.h lparser.h \
+ lstring.h ltable.h
+lmathlib.o.wasm: lmathlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lmem.o.wasm: lmem.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
+ llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h
+loadlib.o.wasm: loadlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lobject.o.wasm: lobject.c lprefix.h lua.h luaconf.h lctype.h llimits.h \
+ ldebug.h lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lstring.h lgc.h \
+ lvm.h
+lopcodes.o.wasm: lopcodes.c lprefix.h lopcodes.h llimits.h lua.h luaconf.h
+loslib.o.wasm: loslib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lparser.o.wasm: lparser.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \
+ llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \
+ ldo.h lfunc.h lstring.h lgc.h ltable.h
+lstate.o.wasm: lstate.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
+ lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h llex.h \
+ lstring.h ltable.h
+lstring.o.wasm: lstring.c lprefix.h lua.h luaconf.h ldebug.h lstate.h \
+ lobject.h llimits.h ltm.h lzio.h lmem.h ldo.h lstring.h lgc.h
+lstrlib.o.wasm: lstrlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+ltable.o.wasm: ltable.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
+ llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h lstring.h ltable.h lvm.h
+ltablib.o.wasm: ltablib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+ltests.o.wasm: ltests.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
+ lobject.h ltm.h lzio.h lmem.h lauxlib.h lcode.h llex.h lopcodes.h \
+ lparser.h lctype.h ldebug.h ldo.h lfunc.h lopnames.h lstring.h lgc.h \
+ ltable.h lualib.h
+ltm.o.wasm: ltm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
+ llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h lstring.h ltable.h lvm.h
+lua.o.wasm: lua.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lundump.o.wasm: lundump.c lprefix.h lua.h luaconf.h ldebug.h lstate.h \
+ lobject.h llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lstring.h lgc.h \
+ lundump.h
+lutf8lib.o.wasm: lutf8lib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h
+lvm.o.wasm: lvm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
+ llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lstring.h \
+ ltable.h lvm.h ljumptab.h
+lzio.o.wasm: lzio.c lprefix.h lua.h luaconf.h llimits.h lmem.h lstate.h \
+ lobject.h ltm.h lzio.h
+else
 lapi.o: lapi.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
  lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lstring.h \
  ltable.h lundump.h lvm.h
@@ -206,5 +279,6 @@ lvm.o: lvm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
  ltable.h lvm.h ljumptab.h
 lzio.o: lzio.c lprefix.h lua.h luaconf.h llimits.h lmem.h lstate.h \
  lobject.h ltm.h lzio.h
+endif
 
 # (end of Makefile)