feat(stable-api): add float, hash, and encoding methods #681
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Implements #668, #661, #663 - Add num2dbl to StableApiDefinition for NUM2DBL Converts Ruby numeric (Float, Fixnum) to C double Uses rb_num2dbl for all numeric types - Add dbl2num to StableApiDefinition for DBL2NUM Converts C double to Ruby Float VALUE Uses rb_float_new for heap allocation - Add rhash_size to StableApiDefinition for RHASH_SIZE Returns number of entries in a Hash Converts fixnum result from rb_hash_size to usize - Add rhash_empty_p to StableApiDefinition for RHASH_EMPTY_P Returns true if hash size is 0 Implemented as wrapper around rhash_size - Add encoding_get to StableApiDefinition for ENCODING_GET Extracts encoding index from object flags (bits 16-23) Provides both macro-based and manual extraction Implement for all Ruby versions: - Ruby 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, 4.0 Add C fallbacks in compiled.c: - impl_num2dbl calls NUM2DBL - impl_dbl2num calls DBL2NUM - impl_rhash_size calls RHASH_SIZE - impl_rhash_empty_p calls RHASH_EMPTY_P - impl_encoding_get with fallback for older Ruby versions Add public macro wrappers in macros.rs: - NUM2DBL, DBL2NUM, RHASH_SIZE, RHASH_EMPTY_P, ENCODING_GET Add comprehensive parity tests: - test_num2dbl_float: float conversion - test_num2dbl_fixnum: fixnum conversion - test_num2dbl_negative_fixnum: negative fixnum - test_dbl2num_and_num2dbl_roundtrip: roundtrip test - test_rhash_size_empty: empty hash - test_rhash_size_with_elements: hash with entries - test_rhash_empty_p_empty: empty check - test_rhash_empty_p_with_elements: non-empty check - test_encoding_get_utf8_string: UTF-8 encoding - test_encoding_get_ascii_string: ASCII encoding All 90 stable API tests pass.
Add fast path optimizations to NUM2DBL for all Ruby versions: - Flonum decoding: Direct bit manipulation when ruby_use_flonum=true - Fixnum conversion: Fast right-shift conversion to double - Fallback: Use rb_num2dbl for heap Float and Bignum This matches the Ruby C implementation in internal/numeric.h and significantly improves performance for common numeric conversions.
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Summary
Batch 8 of the stable API implementation plan - Adds complex methods to the Stable API:
NUM2DBL/DBL2NUM- Float conversions with Flonum supportRHASH_SIZE/RHASH_EMPTY_P- Hash size operationsENCODING_GET- Get encoding index from objectChanges
num2dbl(),dbl2num(),rhash_size(),rhash_empty_p(), andencoding_get()methodsNUM2DBL: Handles Flonum encoding (platform-dependent) with fast paths for Fixnum and FlonumDBL2NUM: May return Flonum or heap FloatRHASH_SIZE: Callsrb_hash_size_num()ENCODING_GET: Extracts from flags (bits 16-23)compiled.cand Rust wrapper incompiled.rsmacros.rswith comprehensive documentationstable_api_test.rsTesting
All tests pass successfully ✅
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