add beginning of print stack trace function

introduce std.debug and move std.assert to std.debug.assert
add mem.copy

1 files changed, 16 insertions, 0 deletions

diff --git a/std/debug.zig b/std/debug.zig
new file mode 100644
index 0000000000..1a289b645e
--- /dev/null
+++ b/std/debug.zig
@@ -0,0 +1,16 @@
+const io = @import("io.zig");
+
+pub fn assert(b: bool) {
+    if (!b) unreachable{}
+}
+
+pub fn print_stack_trace() {
+    var maybe_fp: ?&const u8 = @frame_address();
+    while (true) {
+        const fp = maybe_fp ?? break;
+        const return_address = *(&const usize)(usize(fp) + @sizeof(usize));
+        %%io.stderr.print_u64(return_address);
+        %%io.stderr.printf("\n");
+        maybe_fp = *(&const ?&const u8)(fp);
+    }
+}