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A builtin's own method no route compiles is refused, not a NoMethodError - #10166
h={a: 1,b: 2}e=h.transform_values# CRuby: an Enumeratorpe.class
CRuby prints Enumerator. Spinel compiled the program, and it raised undefined method 'transform_values' for an instance of Hash (NoMethodError) at run time, with no refusal.
Cause
emit_unresolved_call is where a call no emitter took ends up. Its gate raises NoMethodError, as CRuby would for a method that does not exist. A call on a value typed as a builtin's instance, of a method that class has in CRuby, is no such call: the compiler only has no route for it.
Fix
unresolved_builtin_refusal refuses such a call at compile time, naming the class and the method. This applies when the receiver's type is an Array, a Hash, a String, an Integer, a Float, a Symbol or a Range, and CRuby's own table (builtin_arity.inc) gives that class the method. Under --defer-refusals, it raises NotImplementedError where it runs.
Only a call the program wrote is refused (an_written_call: a call whose id is below the table's size when the analysis began). An arm a rewrite builds is guarded by a test that may never pass, and keeps its NoMethodError. Examples of such arms:
the class's own arm of desugar_builtin_enum_calls;
the arities and block forms of desugar_builtin_splat_forward;
desugar_unpack_block's block test.
Without that rule, three tests that pass on master were refused at such arms: builtin_splat_forward.rb, splat_forwarded_block_aref.rb and string_unpack_block.rb.
docs/limitations.md has a row for the refusal.
Tests
test/reject/unresolved_builtin_method.rb (new): the blockless Hash#transform_values above. It compiles on master, and is refused with this change. tools/refusals.sh --update adds its six lines to test/collect/refusals.expected.
test/reject/unresolved_builtin_method_sym_block.rb (new, second commit): none_yet.drop_while(&:label), on the answer of a method that returns a local assigned only []. It compiles on master and raises NoMethodError, and is refused with this change. It adds six more lines to refusals.expected.
REFUSALS_JOBS=4 tools/refusals.sh --corpus (test/, benchmark/, packages/*/test/, both overflow modes) adds no refusal. It differs from test/collect/refusals-corpus.expected only where master does too: the three packages/date promote lines it no longer has, and promote_rational_bignum.rb's default one.
make reject-test, make defer-refusals-test and tools/refusals.sh pass.
The 532 test/*.rb programs whose .expected mentions NoMethodError or "undefined method" were built with --int-overflow=raise and with --int-overflow=promote.
1046 of the 1064 builds print what CRuby prints.
15 print what their .expected holds.
Three differ from their .expected exactly as on master: poly_call_fast_abi_gate under promote, promote_array_index_sum under raise, and range_symbol_endpoints under promote.
scale-test
The same numbers before (master d4a4587) and after:
scale-test: boxed Hash store work at 2x the methods is 1.93x (limit 2.20)
scale-test: boxed-receiver alias work at 2x the writes is 1.85x (limit 2.20)
scale-test: instance_eval forwarding work at 2x the wrappers is 1.71x (limit 2.50)
scale-test: work at 4x the program is 4.96x (linear 4.00, limit 5.40)
scale-test: work at 4x the program, compiled to C, is 6.30x (limit 6.90)
scale-test: call-shape work at 4x the units, compiled to C, is 4.29x (linear 4.00, limit 4.50)
scale-test: the analysis of a String chain at 4x the links is 4.14x (linear 4.00, limit 4.60)
Summary by CodeRabbit
Bug Fixes
Calls to recognized methods on Array, Hash, String, Integer, Float, Symbol, and Range that the compiler cannot support are refused at compile time with a diagnostic naming the class and method.
With --defer-refusals, these calls raise NotImplementedError if reached, rather than falling through to NoMethodError.
Documentation
Updated the limitations table to describe how unsupported built-in method calls are handled.
Tests
Added coverage for unsupported Hash#transform_values and Array#drop_while call forms.
emit_unresolved_call raises NoMethodError for a call no emitter took, as
CRuby would for a method that does not exist. A call on a value typed as
an Array, a Hash, a String, an Integer, a Float, a Symbol or a Range of a
method that class has in CRuby (`h.transform_values` with no block) is
no such call: the compiler only has no route for it, and the program
raised NoMethodError where CRuby calls the method, with no refusal.
Such a call is now refused at compile time, naming the class and the
method; under --defer-refusals it raises NotImplementedError where it
runs. Only a call the program wrote is refused: an arm a rewrite builds
is guarded by a test that may never pass (a class's own arm of
desugar_builtin_enum_calls, the arities and block forms of
desugar_builtin_splat_forward, desugar_unpack_block's block test), and
keeps the NoMethodError it raised before.
`none_yet.drop_while(&:label)`, on the answer of a method that returns
a local assigned only `[]`: no route of the compiler takes the call, and
it is refused, naming Array#drop_while, where it raised NoMethodError.
The analyzer now identifies source-written calls. Code generation refuses unresolved calls to known methods on supported built-in types. Tests cover Hash#transform_values and Array#drop_while, and the limitations table describes the refusal behavior.
The analyzer records the initial node count to identify source-written calls. Code generation checks unresolved calls against known methods on supported built-in types before existing fallback handling. Tests cover Hash#transform_values and Array#drop_while; the limitations table describes the refusal behavior.
matz/spinel#10151: Reopened-builtin method resolution can affect whether an Array call reaches the new unresolved-call refusal.
matz/spinel#8197: Compiler routes for String methods determine whether calls reach the new refusal path.
matz/spinel#8211: This PR applies the unsupported-call refusal contract to known built-in methods without compiler routes.
Suggested reviewers:matz
Merge Risk: Minimal · up to fcba9
No confirmed merge-blocking risk remains in the reviewed change.
Pre-merge checks: 4 · 1
Failed checks: 1 inconclusive
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Explanation
Resolution
Docstring Coverage
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (4 skipped: 2 …
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title clearly describes the main change: unresolved methods defined by builtins are refused at compile time instead of producing NoMethodError.
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Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
Explanation
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (4 skipped: 2 unsupported, 2 too large.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/codegen_call.c:
- Line 22474: In the eligible source-written `lazy` call path, check for a
stored lazy chain before calling `unresolved_builtin_refusal`; this prevents
`Array#lazy` handling from invoking `unsupported(...)` first. Preserve the
stored-chain limitation and workaround diagnostic as the reported error.
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unresolved_builtin_refusal ran ahead of the lazy-chain refusal in
emit_unresolved_call. `unsupported` does not return, so a call both
would refuse would have been named only as a method no route takes,
losing the lazy-chain refusal's words on what to write instead. It now
runs after every refusal of a particular shape there, just before the
NoMethodError gate. No refusal's words change: the program-written
`lazy` calls of test/reject reach the lazy-chain refusal either way.
#10166 refused every call on a builtin's value of a method the class has
that no emitter took. A call with arguments can lack a route because
CRuby rejects one of them as well: `[1, 2, 3].find(42) { false }` raises
NoMethodError over 42.call (ruby/spec core/array find_spec__008 and
rfind_spec__008, which passed and were refused), and gsub!(an Array)
raises TypeError (test/rbs-seed/str_gsub_bang_enum_pattern, refused).
The gate's raise stands for that, so only a call with no arguments is
refused, the shape #10166's examples have.
Refs #10166
Co-Authored-By: Claude <noreply@anthropic.com>
Merged in 4ea5afb, with one follow-up (d2c1873): the refusal now applies only to a call with no arguments. With arguments, a missing route can coincide with CRuby raising over one of them: [1, 2, 3].find(42) { false } raises NoMethodError (42.call), which ruby/spec core/array find_spec__008 and rfind_spec__008 check and which passed through the gate's raise; and gsub!(an_array) raises TypeError (test/rbs-seed/str_gsub_bang_enum_pattern). Both were refused with the first version. Your two examples (transform_values, drop_while(&:label)) take no arguments and are still refused. Thanks!
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Symptom
CRuby prints
Enumerator. Spinel compiled the program, and it raisedundefined method 'transform_values' for an instance of Hash (NoMethodError)at run time, with no refusal.Cause
emit_unresolved_callis where a call no emitter took ends up. Its gate raises NoMethodError, as CRuby would for a method that does not exist. A call on a value typed as a builtin's instance, of a method that class has in CRuby, is no such call: the compiler only has no route for it.Fix
unresolved_builtin_refusalrefuses such a call at compile time, naming the class and the method. This applies when the receiver's type is an Array, a Hash, a String, an Integer, a Float, a Symbol or a Range, and CRuby's own table (builtin_arity.inc) gives that class the method. Under--defer-refusals, it raises NotImplementedError where it runs.Only a call the program wrote is refused (
an_written_call: a call whose id is below the table's size when the analysis began). An arm a rewrite builds is guarded by a test that may never pass, and keeps its NoMethodError. Examples of such arms:desugar_builtin_enum_calls;desugar_builtin_splat_forward;desugar_unpack_block's block test.Without that rule, three tests that pass on master were refused at such arms:
builtin_splat_forward.rb,splat_forwarded_block_aref.rbandstring_unpack_block.rb.docs/limitations.mdhas a row for the refusal.Tests
test/reject/unresolved_builtin_method.rb(new): the blocklessHash#transform_valuesabove. It compiles on master, and is refused with this change.tools/refusals.sh --updateadds its six lines totest/collect/refusals.expected.test/reject/unresolved_builtin_method_sym_block.rb(new, second commit):none_yet.drop_while(&:label), on the answer of a method that returns a local assigned only[]. It compiles on master and raises NoMethodError, and is refused with this change. It adds six more lines torefusals.expected.REFUSALS_JOBS=4 tools/refusals.sh --corpus(test/, benchmark/, packages/*/test/, both overflow modes) adds no refusal. It differs fromtest/collect/refusals-corpus.expectedonly where master does too: the three packages/date promote lines it no longer has, andpromote_rational_bignum.rb's default one.make reject-test,make defer-refusals-testandtools/refusals.shpass.test/*.rbprograms whose.expectedmentions NoMethodError or "undefined method" were built with--int-overflow=raiseand with--int-overflow=promote..expectedholds..expectedexactly as on master:poly_call_fast_abi_gateunder promote,promote_array_index_sumunder raise, andrange_symbol_endpointsunder promote.scale-test
The same numbers before (master d4a4587) and after:
Summary by CodeRabbit
Array,Hash,String,Integer,Float,Symbol, andRangethat the compiler cannot support are refused at compile time with a diagnostic naming the class and method.--defer-refusals, these calls raiseNotImplementedErrorif reached, rather than falling through toNoMethodError.Hash#transform_valuesandArray#drop_whilecall forms.