1b6cbc17e7
Return-trace frames now resolve to real `func at file:line:col`
in-process — no DWARF, no symbolizer.
- New niladic, span-stamped `.trace_frame` IR op (mirrors is_comptime):
carries no operands; each backend derives the frame from context.
lower.zig's placeholderTraceFrame emits it; the existing
sx_trace_push call consumes it.
- emit_llvm: resolve the op's span + current function to
{file(basename), line, col, func}, build an interned Frame global
({string,i32,i32,string}, strings cached by content), push its
address (ptrtoint).
- interp: pack (func_id << 32 | span.start) for the comptime resolver
(slice 3b); never a pointer.
- sx_trace.c report_unhandled derefs SxFrame; trace.sx gains the Frame
struct, frame_at -> *Frame, and field-reading to_string. Layout
mirrored in 3 places with cross-ref comments.
Verified JIT + AOT. Snapshots 243/244/247 regenerated (placeholder ->
func at file:line:col). Gates: zig build, zig build test,
run_examples.sh -> 290 passed.
78 lines
3.0 KiB
Plaintext
78 lines
3.0 KiB
Plaintext
#import "std.sx";
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// =====================================================================
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// trace.sx — error return-trace formatting (ERR step E3.3).
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//
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// Reads the thread-local return-trace buffer (ERR E3.1, populated by the
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// push/clear wiring in E3.2) and renders it. A `raise` / propagating `try`
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// pushes a frame; an absorbing site (`catch` / `or value` / destructure)
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// clears the buffer. So at format time the buffer holds exactly the frames
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// of failures that escaped to where you're formatting — typically inside a
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// `catch` handler (the clear fires when the handler completes, so the body
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// still sees the chain) or the (future) failable-`main` wrapper.
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//
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// Frame resolution (ERR E3.0 slice 3a): in compiled code a frame is a pointer
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// to an interned `Frame` the compiler stamped in at the push site, so the
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// location resolves in-process with no DWARF and no symbolizer. (The comptime
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// path — a packed `(func_id, ir_offset)` resolved via the interpreter's IR
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// tables — lands with slice 3b.)
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// =====================================================================
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libc :: #library "c";
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// The compiled return-trace frame. Layout MUST match `getFrameStructType` in
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// src/ir/emit_llvm.zig and `SxFrame` in library/vendors/sx_trace_runtime/sx_trace.c.
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Frame :: struct {
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file: string;
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line: s32;
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col: s32;
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func: string;
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}
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// The error-trace buffer C API (library/vendors/sx_trace_runtime/sx_trace.c),
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// linked in for the JIT and auto-injected for AOT when traces are used.
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// `frame_at` hands back the stamped `*Frame` (the compiler stored its address).
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sx_trace_len :: () -> u32 #foreign;
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sx_trace_truncated :: () -> u32 #foreign;
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sx_trace_frame_at :: (i: u32) -> *Frame #foreign;
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write :: (fd: s32, buf: [*]u8, count: usize) -> isize #foreign libc;
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// Render the current trace buffer to a string (allocated from
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// context.allocator). Empty buffer → "" so callers can cheaply skip output.
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to_string :: () -> string {
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n := sx_trace_len();
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if n == 0 { return ""; }
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result := "error return trace (most recent call last):\n";
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if sx_trace_truncated() != 0 {
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result = concat(result, " ... older frames omitted (buffer full)\n");
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}
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i : u32 = 0;
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while i < n {
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f := sx_trace_frame_at(i);
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line := format(" {} at {}:{}:{}\n", f.func, f.file, f.line, f.col);
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result = concat(result, line);
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i = i + 1;
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}
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result;
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}
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// Write the current trace to stderr (fd 2). No-op when the buffer is empty.
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print_current :: () {
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s := to_string();
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if s.len > 0 {
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write(2, s.ptr, xx s.len);
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}
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}
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// Dump the comptime (`#run`) interpreter call-frame chain (ERR E4.1). At
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// comptime the interpreter walks its active sx frames and appends them to the
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// build output; in compiled code this folds to nothing (there is no
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// interpreter stack — the only caller is a dead `is_comptime()` branch).
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// Frame source locations await IR-offset resolution, so only names print today.
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print_interpreter_frames :: () {
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__interp_print_frames();
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}
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