zig

commit 2174d205409c17588f22cf60f8bba1fc1aa5c8d5 (tree)
parent 728103467edba5f3407b1aaa89c9b6dda9432884
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Fri, 20 Dec 2024 22:42:07 -0800

fix stack pointer initialized to wrong vaddr

Diffstat:
M
src/link/Wasm/Flush.zig
 | 
13
++++++-------

1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/src/link/Wasm/Flush.zig b/src/link/Wasm/Flush.zig
@@ -564,13 +564,12 @@ pub fn finish(f: *Flush, wasm: *Wasm) !void {
                 .__heap_base => @panic("TODO"),
                 .__heap_end => @panic("TODO"),
                 .__stack_pointer => {
-                    try binary_bytes.appendSlice(gpa, &.{
-                        @intFromEnum(std.wasm.Valtype.i32),
-                        @intFromBool(true), // mutable
-                        @intFromEnum(std.wasm.Opcode.i32_const),
-                        0, // leb128 init value
-                        @intFromEnum(std.wasm.Opcode.end),
-                    });
+                    try binary_bytes.ensureUnusedCapacity(gpa, 9);
+                    binary_bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Valtype.i32));
+                    binary_bytes.appendAssumeCapacity(1); // mutable
+                    binary_bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Opcode.i32_const));
+                    leb.writeUleb128(binary_bytes.fixedWriter(), virtual_addrs.stack_pointer) catch unreachable;
+                    binary_bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Opcode.end));
                 },
                 .__tls_align => @panic("TODO"),
                 .__tls_base => @panic("TODO"),