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That means it's a method not to be included in the backtrace, for
example `raise`.
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Instead, copy them from the outer frame as CRuby does.
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- `mrb_exc_backtrace` to implement `Exception#backtrace`
- `mrb_get_backtrace` to implement `#caller`
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- add comment for unpacking
- avoid saving the symbol in a local variable
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Otherwise we suffer `(unknown):0:` errors.
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When debug information is omitted within ireps, show that a stack
frame existed rather than silently hiding it.
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This reverts commit dc51d89ac22acc60b9bfeed87115863565b74085.
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Instead of including `mruby/presym.h` everywhere, we provided the
fallback `mruby/presym.inc` under `include/mruby` directory, and specify
`-I<build-dir>/include` before `-I<top-dir>/include` in `presym.rake`.
So even when someone drops `-I<build-dir>/include` in compiler options,
it just compiles without failure.
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https://github.com/shuujii/mruby into shuujii-avoid-including-presym.inc-in-existing-header-files
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Addressed an issue where existing programs linking `libmruby.a` could only
be built by adding `<build-dir>/include` to compiler's include path.
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This enhances self-containment.
- Changed the `mrb_callinfo::pc` field to point to itself.
Previously it indicated the return destination of the previous call level.
`mrb_callinfo::pc` will now hold the address to its own `proc->body.irep->iseq`.
- Removed `mrb_callinfo::err` field.
This is because `mrb_callinfo::pc - 1` is semantically the same as the previous `err`.
- The `pc0` and `pc_save` variables in `mrb_vm_exec()` are no longer needed and have been deleted.
- It removes the argument because `cipush()` doesn't need to save the previous `pc`.
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| Previous Name | New Name |
|------------------------------|-------------------------|
| MRB_ENABLE_ALL_SYMBOLS | MRB_USE_ALL_SYMBOLS |
| MRB_ENABLE_SYMBOLL_ALL | MRB_USE_ALL_SYMBOLS |
| MRB_ENABLE_CXX_ABI | MRB_USE_CXX_ABI |
| MRB_ENABLE_CXX_EXCEPTION | MRB_USE_CXX_EXCEPTION |
| MRB_ENABLE_DEBUG_HOOK | MRB_USE_DEBUG_HOOK |
| MRB_DISABLE_DIRECT_THREADING | MRB_NO_DIRECT_THREADING |
| MRB_DISABLE_STDIO | MRB_NO_STDIO |
| ENABLE_LINENOISE | MRB_USE_LINENOISE |
| ENABLE_READLINE | MRB_USE_READLINE |
| DISABLE_MIRB_UNDERSCORE | MRB_NO_MIRB_UNDERSCORE |
| DISABLE_GEMS | MRB_NO_GEMS |
* `MRB_ENABLE_SYMBOLL_ALL` seems to be a typo, so it is fixed.
* `MRB_` prefix is added to those without.
* The previous names can also be used for compatibility.
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- `pool`
- `syms`
- `reps`
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The following improvements are made according to Ruby's behavior:
- Match location number to index.
- Remove duplicate most recent call output.
- Fix that first call is not output when array (unpacked) backtrace.
### Example
```ruby
def a; raise "error!" end
def b; a end
begin
b
rescue => e
e.backtrace if ARGV[0] == "unpack" # unpack backtrace
raise e
end
```
#### Before this patch:
```
$ bin/mruby example.rb unpack
trace (most recent call last):
[0] example.rb:2:in b
[1] example.rb:1:in a
example.rb:1: error! (RuntimeError)
```
#### After this patch:
```
$ bin/mruby example.rb unpack
trace (most recent call last):
[2] example.rb:4
[1] example.rb:2:in b
example.rb:1:in a: error! (RuntimeError)
```
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`struct backtrace_location` is created only in `each_backtrace()`, and
the `filename` field will never be null (it will be `(unknown)` if null).
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* mrb_sym2name -> mrb_sym_name
* mrb_sym2name_len -> mrb_sym_name_len
* mrb_sym2str -> mrb_sym_str
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The binary sizes (gems are only `mruby-bin-mruby`) are reduced slightly in
my environment than before the introduction of new specifiers/modifiers
(5116789a) with this change.
------------+-------------------+-------------------+--------
BINARY | BEFORE (5116789a) | AFTER (This PR) | RATIO
------------+-------------------+-------------------+--------
mruby | 593416 bytes | 593208 bytes | -0.04%
libmruby.a | 769048 bytes | 767264 bytes | -0.23%
------------+-------------------+-------------------+--------
BTW, I accidentally changed `tasks/toolchains/visualcpp.rake` at #4613,
so I put it back.
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The addresses for packed inline symbols reference `mrb->symbuf` that
could be overridden by the later call of `mrb_sym2name_len`. Since
file names in call stack information are kept as symbols, keeping the
address in the C structures could cause problems like #4342.
This changes small incompatible changes in function prototypes:
* `mrb_parser_get_filename`: return value changed to `mrb_sym`.
* `mrb_debug_get_filename`: add `mrb_state*` as a first argument.
* `mrb_debug_get_line`: ditto.
I believe above functions are almost internal, and no third-party
mrbgem use them.
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- Move calling `mrb_debug_get_filename()` to after `lineno` check.
- Remove unneeded array check in `print_backtrace()`.
- Add a few `const` qualifier.
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shuujii/reorder-members-in-struct-backtrace_location
Reorder members in `struct backtrace_location`
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`sizeof(struct backtrace_location)` is 24 bytes -> 16 bytes in LP64
data model etc.
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'int', possible loss of data
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