agra
179310d62b
mem: Phase 1.4a — fat-pointer aggregates from #run serialize via host memory
...
The Phase 1.4 serializer left a silent malformed-const case: when the
interp evaluated a `#run` returning a string (or anything with a fat
pointer inside), the data field came in as a `.int` holding a libc
host address. `LLVMConstInt(ptr_type, addr, 1)` happily emitted `i0 0`
in the static const, and the runtime segfaulted on the first read.
Phase 1.4a closes this for string and slice destinations. The signature
of `valueToLLVMConst` now takes the IR `TypeId` (instead of just the
LLVM type) and a borrowed `*Interpreter`. A new helper
`serializeAggregateValue` splits on the IR type:
- `string` / `slice` (fat pointer `{data, len}`): extract `len`, read
that many bytes from the data field's address (via `interp.heapSlice`
for `heap_ptr`, via a new `readHostBytes` for `byte_ptr` / `.int`,
via slice indexing for string literals). Emit the bytes as a private
global byte array using the existing `emitConstStringGlobal`. The
fat-pointer aggregate's data ptr resolves to the byte array's address.
- `struct`: walk the IR field types in lockstep with the value's
fields; recurse with each declared field TypeId. This replaces the
old LLVM-type-walk via `LLVMStructGetTypeAtIndex` which couldn't tell
string-typed fields from generic ptr fields.
- `array`: walk with the element TypeId.
The remaining `.int → ptr` trap (a host address landing in a bare ptr
field outside a fat pointer) now bails loudly with a named diagnostic
identifying it as Phase 1.4a heap-walk follow-up territory. No
practical trigger in-tree, so deferred.
`Interpreter.heapSlice` promoted from package-private to `pub` so
the serializer can read interp-managed heap data.
Regression: `examples/136-comptime-string-global.sx` —
`GREETING :: #run build_greeting();` where `build_greeting` returns
`concat("hello", " world")`. Runtime prints `greeting = 'hello world'`
and `greeting.len = 11`. Pre-1.4a this segfaulted on the first read.
158/158 example tests; chess clean on macOS / iOS sim / Android via
`tools/verify-step.sh`.
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..
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