TLDR: no need to call either of:
program.emit_insn_with_label_dependency() -> just call program.emit_insn()
program.defer_label_resolution() -> just call program.resolve_label()
Changes:
- make BranchOffset an explicit enum (Label, Offset, Placeholder)
- remove program.emit_insn_with_label_dependency() - label dependency is automatically detected
- for label to offset mapping, use a hashmap from label(negative i32) to offset (positive u32)
- resolve all labels in program.build()
- remove program.defer_label_resolution() - all labels are resolved in build()
- Limbo command line shell supports e.g. `SELECT x'616263';`
- `EXPLAIN SELECT x'616263';` lists the opcode
Missing:
- Command line shell not entirely compatible with SQLite when blobs have
non-printable characters in the middle (e.g. `SELECT x'610062';`)
- Python bindings not supported (incoming soon)
This reverts commit e365c12ce0, reversing
changes made to 21bd1a961e. The pull request broke some tests:
```
thread 'main' panicked at core/vdbe/mod.rs:1713:72:
index out of bounds: the len is 3 but the index is 3
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
while executing
"exec {*}$command"
(procedure "evaluate_sql" line 3)
invoked from within
"evaluate_sql $sqlite_exec $sql"
(procedure "run_test" line 2)
invoked from within
"run_test $::sqlite_exec $combined_sql $combined_expected_output"
(procedure "do_execsql_test" line 5)
invoked from within
"do_execsql_test sqlite_version {
SELECT sqlite_version();
} {3.46.1}"
(file "./testing/scalar-functions.test" line 434)
invoked from within
"source $testdir/scalar-functions.test"
(file "./testing/all.test" line 16)
make: *** [Makefile:59: test-compat] Error 1
```
