[pull] master from ruby:master #370
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We have a lot of patchpoint exits on some applications and this helps pin down why.
Now methods on singleton classes (for example, `new`) get split up into
`String*#new`, `Array*#new`, ... (where the `*` indicates a singleton
class) instead of all looking like `Class#new`.
before:
```
***ZJIT: Printing ZJIT statistics on exit***
Top-20 not inlined C methods (59.8% of total 10,506,888):
String#<<: 987,752 ( 9.4%)
Kernel#is_a?: 755,223 ( 7.2%)
Hash#[]=: 700,802 ( 6.7%)
Regexp#match?: 400,129 ( 3.8%)
String#empty?: 353,775 ( 3.4%)
String#start_with?: 334,961 ( 3.2%)
Hash#key?: 331,080 ( 3.2%)
ObjectSpace::WeakKeyMap#[]: 238,978 ( 2.3%)
TrueClass#===: 235,771 ( 2.2%)
FalseClass#===: 231,144 ( 2.2%)
Array#include?: 213,362 ( 2.0%)
Kernel#respond_to?: 198,730 ( 1.9%)
Kernel#dup: 178,920 ( 1.7%)
Kernel#block_given?: 178,767 ( 1.7%)
BasicObject#!=: 170,602 ( 1.6%)
Class#new: 168,079 ( 1.6%)
Kernel#kind_of?: 165,600 ( 1.6%)
String#==: 158,036 ( 1.5%)
Module#clock_gettime: 144,992 ( 1.4%)
NilClass#===: 137,833 ( 1.3%)
```
after:
```
***ZJIT: Printing ZJIT statistics on exit***
Top-20 not inlined C methods (59.8% of total 10,506,906):
String#<<: 987,752 ( 9.4%)
Kernel#is_a?: 755,237 ( 7.2%)
Hash#[]=: 700,802 ( 6.7%)
Regexp#match?: 400,129 ( 3.8%)
String#empty?: 353,775 ( 3.4%)
String#start_with?: 334,961 ( 3.2%)
Hash#key?: 331,080 ( 3.2%)
ObjectSpace::WeakKeyMap#[]: 238,978 ( 2.3%)
TrueClass#===: 235,771 ( 2.2%)
FalseClass#===: 231,144 ( 2.2%)
Array#include?: 213,362 ( 2.0%)
Kernel#respond_to?: 198,730 ( 1.9%)
Kernel#dup: 178,920 ( 1.7%)
Kernel#block_given?: 178,767 ( 1.7%)
BasicObject#!=: 170,602 ( 1.6%)
String*#new: 166,696 ( 1.6%)
Kernel#kind_of?: 165,600 ( 1.6%)
String#==: 158,039 ( 1.5%)
Process*#clock_gettime: 144,992 ( 1.4%)
NilClass#===: 137,833 ( 1.3%)
```
This counts methods that can be folded away to nothing *in addition* to the already-counted `CCall`.
remove_class_from_subclasses calls st_insert, which mallocs. Malloc is not
allowed in GC. This commit replaces the st_insert with an st_update since
we know that ns_id exists in the st_table.
The following script reproduces the crash:
require "tempfile"
Tempfile.create do |file|
ns = Namespace.new
ns.require(file)
end
…e fetcher The remote fetcher only works with certain schemes (`http`, `https`, `s3`, and `file`). It's possible for other schemes to show up in this code and it can cause bugs. Before this patch, doing `gem install path:///hello` would result in an infinite loop because this function would do `send "fetch_path"`, calling itself forever. Now we see an exception. I think we should validate gem names earlier, but it's really best practice to restrict the possible strings passed to `send`. ruby/rubygems@54e2781b73
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