I would like to check if a symbol is defined before trying to access it.
Some symbols aren't available on all platforms, so instead of raising an
exception, I want to check if it's defined first.
Today we have to do:
```ruby
begin
addr = Fiddle::Handle.sym("something")
# do something
rescue Fiddle::DLError
end
```
I want to write this:
```ruby
if Fiddle::Handle.sym_defined?("something")
addr = Fiddle::Handle.sym("something")
# do something
end
```
9d3371de13
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
This helps to reduce repetition in code. Instead of doing "TYPE_*"
everywhere, you can do `include Fiddle::Types`, and write the type name
directly.
This PR is to help reduce repetition when writing Fiddle code. Right now
we have to type `TYPE_` everywhere, and you also have to include all of
`Fiddle` to access `TYPE_*` constants. With this change, you can just
include `Fiddle::Types` and it will shorten your code and also you only
have to include those constants.
Here is an example before:
```ruby
require "fiddle"
module MMAP
# All Fiddle constants included
include Fiddle
def self.make_function name, args, ret
ptr = Handle::DEFAULT[name]
func = Function.new ptr, args, ret, name: name
define_singleton_method name, &func.to_proc
end
make_function "munmap", [TYPE_VOIDP, # addr
TYPE_SIZE_T], # len
TYPE_INT
make_function "mmap", [TYPE_VOIDP,
TYPE_SIZE_T,
TYPE_INT,
TYPE_INT,
TYPE_INT,
TYPE_INT], TYPE_VOIDP
make_function "mprotect", [TYPE_VOIDP, TYPE_SIZE_T, TYPE_INT], TYPE_INT
end
```
After:
```ruby
require "fiddle"
module MMAP
# Only type names included
include Fiddle::Types
def self.make_function name, args, ret
ptr = Fiddle::Handle::DEFAULT[name]
func = Fiddle::Function.new ptr, args, ret, name: name
define_singleton_method name, &func.to_proc
end
make_function "munmap", [VOIDP, # addr
SIZE_T], # len
INT
make_function "mmap", [VOIDP, SIZE_T, INT, INT, INT, INT], VOIDP
make_function "mprotect", [VOIDP, SIZE_T, INT], INT
end
```
We only need to import the type names, and you don't have to type
`TYPE_` over and over. I think this makes Fiddle code easier to read.
49fa7233e5
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
This commit adds constants for unsigned values. Currently we can use `-`
to mean "unsigned", but I think having a specific name makes Fiddle more
user friendly. This commit continues to support `-`, but introduces
negative constants with "unsigned" names
I think this will help to eliminate [this
code](3a56bf0bcc/lib/mjit/c_type.rb (L31-L38))
2bef0f1082
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
We set the PC in branch_stub_hit(), which only makes sense if we're
running with the intended iseq for the stub. We ran into an issue caught
by this while tweaking code layout.
For logical instructions such as AND, there is a constraint that the N
part of the bitmask immediate must be 0. We weren't respecting this
condition previously and were silently emitting undefined instructions.
Check for this condition in the assembler and tweak the backend to
correctly detect whether a number could be encoded as an immediate in a
32 bit logical instruction. Due to the nature of the immediate encoding,
the same numeric value encodes differently depending on the size of
the register the instruction works on.
We currently don't have cases where we use 32 bit immediates but we ran
into this encoding issue during development.
When the generic_iv_tbl is resized up, rebuild_table performs
allocations that can trigger GC. If autocompaction is enabled, then
moved objects are removed from and inserted into the generic_iv_tbl.
This may cause another call to rebuild_table to resize the
generic_iv_tbl. When returning back to the original rebuild_table, some
of the data may be stale, causing the generic_iv_tbl to be corrupted.
This commit changes rebuild_table to only read data from the st_table
after the allocations have completed.
Co-Authored-By: Matt Valentine-House <matt@eightbitraptor.com>
