checker: disallow op= and infix on a voidptr (#7175)

.github/workflows/ci.yml

@@ -167,7 +167,7 @@ jobs:
     - name: Fixed tests
       run: VJOBS=1 ./v -silent test-fixed
     - name: Build examples
-      run: ./v -silent build-examples
+      run: ./v build-examples
     - name: Build examples with -autofree
       run: |
         ./v -autofree -o tetris examples/tetris/tetris.v
@@ -231,7 +231,7 @@ jobs:
     - name: Fixed tests (-prod)
       run: ./v -o vprod -prod cmd/v && ./vprod -silent test-fixed
     - name: Build examples
-      run: ./v -silent build-examples
+      run: ./v build-examples
     - name: Build examples with -autofree
       run: |
         ./v -autofree -experimental -o tetris examples/tetris/tetris.v

cmd/tools/bench/wyhash.v

@@ -30,7 +30,7 @@ fn main() {
 	checksum = 0
 	for len in str_lens {
 		end_pos := start_pos + len
-		checksum ^= wyhash.wyhash_c(unsafe { bytepile.data + start_pos }, u64(len), 1)
+		checksum ^= wyhash.wyhash_c(unsafe { byteptr(bytepile.data) + start_pos }, u64(len), 1)
 		start_pos = end_pos
 	}
 	bhashing_1.measure('wyhash.wyhash_c  | checksum: ${checksum:22}')

vlib/term/ui/input_nix.c.v

@@ -46,7 +46,7 @@ pub fn (mut ctx Context) run() ? {
 // TODO: remove
 fn (mut ctx Context) shift(len int) {
 	unsafe {
-		C.memmove(ctx.read_buf.data, ctx.read_buf.data + len, ctx.read_buf.cap - len)
+		C.memmove(ctx.read_buf.data, byteptr(ctx.read_buf.data) + len, ctx.read_buf.cap - len)
 		ctx.resize_arr(ctx.read_buf.len - len)
 	}
 }

vlib/term/ui/termios_nix.c.v

@@ -221,7 +221,7 @@ fn (mut ctx Context) termios_loop() {
 			sw.restart()
 			if ctx.cfg.event_fn != voidptr(0) {
 				unsafe {
-					len := C.read(C.STDIN_FILENO, ctx.read_buf.data + ctx.read_buf.len, ctx.read_buf.cap - ctx.read_buf.len)
+					len := C.read(C.STDIN_FILENO, byteptr(ctx.read_buf.data) + ctx.read_buf.len, ctx.read_buf.cap - ctx.read_buf.len)
 					ctx.resize_arr(ctx.read_buf.len + len)
 				}
 				if ctx.read_buf.len > 0 {

vlib/v/checker/checker.v

@@ -627,9 +627,13 @@ pub fn (mut c Checker) infix_expr(mut infix_expr ast.InfixExpr) table.Type {
 	mut left := c.table.get_type_symbol(left_type)
 	left_pos := infix_expr.left.position()
 	right_pos := infix_expr.right.position()
-	if (left_type.is_ptr() || left.is_pointer()) &&
-		infix_expr.op in [.plus, .minus] && !c.inside_unsafe {
-		c.warn('pointer arithmetic is only allowed in `unsafe` blocks', left_pos)
+	if (left_type.is_ptr() || left.is_pointer()) && infix_expr.op in [.plus, .minus] {
+		if !c.inside_unsafe {
+			c.warn('pointer arithmetic is only allowed in `unsafe` blocks', left_pos)
+		}
+		if left_type == table.voidptr_type {
+			c.error('`$infix_expr.op` cannot be used with `voidptr`', left_pos)
+		}
 	}
 	mut return_type := left_type
 	if infix_expr.op != .key_is {
@@ -2228,10 +2232,10 @@ pub fn (mut c Checker) assign_stmt(mut assign_stmt ast.AssignStmt) {
 						c.error('invalid right operand: $left_sym.name $assign_stmt.op $right_sym.name',
 							right.position())
 					}
-				} else if !left_sym.is_number() && !left_sym.is_pointer() {
+				} else if !left_sym.is_number() && left_sym.kind !in [.byteptr, .charptr] {
 					c.error('operator `$assign_stmt.op` not defined on left operand type `$left_sym.name`',
 						left.position())
-				} else if !right_sym.is_number() && !right_sym.is_pointer() {
+				} else if !right_sym.is_number() && left_sym.kind !in [.byteptr, .charptr] {
 					c.error('invalid right operand: $left_sym.name $assign_stmt.op $right_sym.name',
 						right.position())
 				} else if right is ast.IntegerLiteral {

vlib/v/checker/tests/pointer_ops.out

@@ -0,0 +1,42 @@
+vlib/v/checker/tests/pointer_ops.vv:5:7: error: `+` cannot be used with `voidptr`
+    3 |     unsafe {
+    4 |         mut p := voidptr(0)
+    5 |         _ = p + 1
+      |             ^
+    6 |         p++
+    7 |         p += 3
+vlib/v/checker/tests/pointer_ops.vv:6:4: error: invalid operation: ++ (non-numeric type `voidptr`)
+    4 |         mut p := voidptr(0)
+    5 |         _ = p + 1
+    6 |         p++
+      |          ~~
+    7 |         p += 3
+    8 |         _ = p - 1
+vlib/v/checker/tests/pointer_ops.vv:7:3: error: operator `+=` not defined on left operand type `voidptr`
+    5 |         _ = p + 1
+    6 |         p++
+    7 |         p += 3
+      |         ^
+    8 |         _ = p - 1
+    9 |         p--
+vlib/v/checker/tests/pointer_ops.vv:8:7: error: `-` cannot be used with `voidptr`
+    6 |         p++
+    7 |         p += 3
+    8 |         _ = p - 1
+      |             ^
+    9 |         p--
+   10 |         p -= 3
+vlib/v/checker/tests/pointer_ops.vv:9:4: error: invalid operation: -- (non-numeric type `voidptr`)
+    7 |         p += 3
+    8 |         _ = p - 1
+    9 |         p--
+      |          ~~
+   10 |         p -= 3
+   11 |     }
+vlib/v/checker/tests/pointer_ops.vv:10:3: error: operator `-=` not defined on left operand type `voidptr`
+    8 |         _ = p - 1
+    9 |         p--
+   10 |         p -= 3
+      |         ^
+   11 |     }
+   12 | }

vlib/v/checker/tests/pointer_ops.vv

@@ -0,0 +1,12 @@
+// void* arithmetic is not allowed in MSVC, so ban it
+fn test_voidptr() {
+	unsafe {
+		mut p := voidptr(0)
+		_ = p + 1
+		p++
+		p += 3
+		_ = p - 1
+		p--
+		p -= 3
+	}
+}