wasm: remove dependency on thirdparty/binaryen, webassembly backend rewrite (#18120)

vlib/builtin/wasm/builtin.v

@@ -6,6 +6,20 @@ fn __memory_grow(size usize) usize
 fn __memory_fill(dest &u8, value isize, size isize)
 fn __memory_copy(dest &u8, src &u8, size isize)
 
+// add doc comments for the below functions
+
+// __reinterpret_f32_u32 converts a `u32` to a `f32` without changing the bit pattern.
+pub fn __reinterpret_f32_u32(v f32) u32
+
+// __reinterpret_u32_f32 converts a `f32` to a `u32` without changing the bit pattern.
+pub fn __reinterpret_u32_f32(v u32) f32
+
+// __reinterpret_f64_u64 converts a `u64` to a `f64` without changing the bit pattern.
+pub fn __reinterpret_f64_u64(v f64) u64
+
+// __reinterpret_u64_f64 converts a `f64` to a `u64` without changing the bit pattern.
+pub fn __reinterpret_u64_f64(v u64) f64
+
 // vcalloc dynamically allocates a zeroed `n` bytes block of memory on the heap.
 // vcalloc returns a `byteptr` pointing to the memory address of the allocated space.
 // Unlike `v_calloc` vcalloc checks for negative values given in `n`.

vlib/builtin/wasm/wasi/builtin.v

@@ -7,7 +7,7 @@ pub fn print(s string) {
 		len: usize(s.len)
 	}
 
-	WASM.fd_write(1, &elm, 1, -1)
+	WASM.fd_write(1, &elm, 1, 0)
 }
 
 // println prints a message with a line end, to stdout.
@@ -20,7 +20,7 @@ pub fn println(s string) {
 		len: 1
 	}]!
 
-	WASM.fd_write(1, &elm[0], 2, -1)
+	WASM.fd_write(1, &elm[0], 2, 0)
 }
 
 // eprint prints a message to stderr.
@@ -30,7 +30,7 @@ pub fn eprint(s string) {
 		len: usize(s.len)
 	}
 
-	WASM.fd_write(2, &elm, 1, -1)
+	WASM.fd_write(2, &elm, 1, 0)
 }
 
 // eprintln prints a message with a line end, to stderr.
@@ -43,7 +43,7 @@ pub fn eprintln(s string) {
 		len: 1
 	}]!
 
-	WASM.fd_write(2, &elm[0], 2, -1)
+	WASM.fd_write(2, &elm[0], 2, 0)
 }
 
 // exit terminates execution immediately and returns exit `code` to the shell.
@@ -57,6 +57,5 @@ pub fn exit(code int) {
 pub fn panic(s string) {
 	eprint('V panic: ')
 	eprintln(s)
-	_ := *&u8(-1)
 	exit(1)
 }

vlib/builtin/wasm/wasi/int.v

@@ -52,21 +52,18 @@ fn (nn int) str_l(max int) string {
 		}
 		diff := max - index
 		vmemmove(buf, voidptr(buf + index), diff + 1)
-		/*
-		// === manual memory move for bare metal ===
-		mut c:= 0
-		for c < diff {
-			buf[c] = buf[c+index]
-			c++
-		}
-		buf[c] = 0
-		*/
 		return tos(buf, diff)
 
 		// return tos(memdup(&buf[0] + index, (max - index)), (max - index))
 	}
 }
 
+// str returns the value of the `u8` as a `string`.
+// Example: assert u8(2).str() == '2'
+pub fn (n u8) str() string {
+	return int(n).str_l(5)
+}
+
 // str returns the value of the `i8` as a `string`.
 // Example: assert i8(-2).str() == '-2'
 pub fn (n i8) str() string {

vlib/builtin/wasm/wasi/wasi.v

@@ -1,4 +1,3 @@
-[wasm_import_namespace: 'wasi_snapshot_preview1']
 module builtin
 
 struct CIOVec {
@@ -9,6 +8,9 @@ struct CIOVec {
 type Errno = u16
 type FileDesc = int
 
+[wasm_import_namespace: 'wasi_snapshot_preview1']
 fn WASM.fd_write(fd FileDesc, iovs &CIOVec, iovs_len usize, retptr &usize) Errno
+
+[wasm_import_namespace: 'wasi_snapshot_preview1']
 [noreturn]
 fn WASM.proc_exit(rval int)