Added some missing intrinsics

wasmrt.nim

@@ -679,12 +679,21 @@ proc mmap(a: pointer, len: csize_t, prot, flags, fildes: cint, off: int): pointe
 
   wasmAlloc(len)
 
+proc malloc(sz: csize_t): pointer {.exportc.} = alloc(sz)
+proc free(p: pointer) {.exportc.} = dealloc(p)
+
 # Suppress __wasm_call_ctors
 # https://stackoverflow.com/questions/72568387/why-is-an-objects-constructor-being-called-in-every-exported-wasm-function
 proc initialize() {.stackTrace: off, exportc: "_initialize", codegenDecl: wasmExportCodegenDecl.} =
   proc ctors() {.importc: "__wasm_call_ctors".}
   ctors()
 
+when compileOption("stackTrace"):
+  {.push stackTrace: off.}
+  proc wasmStackTrace() {.exportwasm.} =
+    writeStackTrace()
+  {.pop.}
+
 when not defined(gcDestructors):
   GC_disable()
 

wasmrt/libc.nim

@@ -1,7 +1,19 @@
-import posix
+import posix, strutils, os
 
 import ../wasmrt
 
+const
+  builtinsPath = currentSourcePath.rsplit({DirSep, AltSep}, 1)[0] &
+    "/llvm-builtins/builtins/"
+
+template c(s: string) =
+  {.compile: builtinsPath & s.}
+
+# TODO: Extend the following list as needed
+c "multi3.c"
+c "lshrti3.c"
+c "ashrti3.c"
+
 proc gettimeImpl(): cint {.importwasmf: "Date.now".}
 
 proc clock_gettime(clkId: Clockid, tp: var Timespec): cint {.exportc.} =

wasmrt/llvm-builtins/README.md

@@ -0,0 +1,4 @@
+The builtins directory in this dir is a copy of 
+https://github.com/llvm/llvm-project/tree/main/compiler-rt/lib/builtins
+of tag illvmorg-17.0.4
+