Support r2core.js for Emscripten >=v1.37.24 (#12502)

* Support r2core.js for Emscripten >=v1.37.24

cwrap needs to be exported explicitly via EXTRA_EXPORTED_RUNTIME_METHODS
+ allocate larger memory, allow for growth and no aborting malloc

* wasm_asm was wrongly also included in anal.wasm

This causes link errors where duplicate symbols aren't allowed.

* supply wasm plugin to suppress meta arch warning

r2 core initializes itself for the current architecture until one is
explicitly specified (e.g. loading a binary).  Since asm.wasm and
arch.wasm isn't supplied by default, r2 when built for WebAssembly
emits some ugly warnings when loading.  Besides, those modules
(incl. bin.wasm) aren't that large.

* r2core: Make it possible to know when init is done

binr/radare2/Makefile

@@ -20,6 +20,10 @@ ifeq (${COMPILER},emscripten)
 # -s INLINING_LIMIT=1
 # --memory-init-file 0
 CFLAGS+=-s EXPORTED_FUNCTIONS='["_r2_asmjs_new", "_r2_asmjs_cmd", "_r2_asmjs_free", "_r2_asmjs_openurl"]'
+CFLAGS+=-s EXTRA_EXPORTED_RUNTIME_METHODS='["cwrap", "addOnInit"]'
+CFLAGS+=-s TOTAL_MEMORY=33554432
+CFLAGS+=-s ALLOW_MEMORY_GROWTH=1
+CFLAGS+=-s ABORTING_MALLOC=0
 #CFLAGS+=-Oz --memory-init-file 0
 endif
 

libr/anal/p/wasm.mk

@@ -1,6 +1,4 @@
-WASM_ROOT=../../asm/arch/wasm
 OBJ_WASM=anal_wasm.o
-OBJ_WASM+=$(WASM_ROOT)/wasm.o
 CFLAGS+=-I$(WASM_ROOT)
 
 STATIC_OBJ+=${OBJ_WASM}

plugins.emscripten.cfg

@@ -6,12 +6,14 @@ asm.x86_cs
 asm.x86_nz
 asm.mips_cs
 asm.avr
+asm.wasm
 anal.avr
 anal.mips_cs
 anal.x86_cs
 anal.arm_cs
 anal.java
 anal.dalvik
+anal.wasm
 bin.any
 bin.elf
 bin.elf64
@@ -22,6 +24,7 @@ bin.mz
 bin.pe64
 bin.mach0
 bin.mach064
+bin.wasm
 bin_xtr.xtr_fatmach0
 core.java
 core.a2f