feat: Add interpreter operators (getppid, package VERSION, process control, math)

[fglock]

Summary

Multiple interpreter improvements to reduce feature gaps when eval blocks use the interpreter (JPERL_EVAL_USE_INTERPRETER=1):

1. getppid operator - Get parent process ID
2. Package VERSION - Automatically set $Package::VERSION for versioned packages
3. Process control operators - getpgrp, setpgrp, getpriority
4. Math operators - atan2

Changes

1. getppid Operator (CompileOperator.java)

./jperl --interpreter -E 'say getppid'  # Works

• Emits GETPPID opcode (135)
• Format: GETPPID rd

2. Package VERSION Setting (CompileOperator.java)

package Foo 1.23; say $Foo::VERSION;  # Prints 1.23

• Check for package version in symbol table
• Set $Package::VERSION using GlobalVariable
• Mirrors compiler behavior

3. Process Control Operators (CompileOperator.java)

getpgrp($pid)           # Get process group  
setpgrp($pid, $pgrp)    # Set process group
getpriority($which, $who)  # Get process priority

• Opcodes: GETPGRP=136, SETPGRP=137, GETPRIORITY=138
• Handlers already in SlowOpcodeHandler

4. Math Operators (CompileOperator.java)

atan2($y, $x)  # Arctangent of y/x

• Opcode: ATAN2=241
• Handler already in ScalarBinaryOpcodeHandler

Test Impact

With JPERL_EVAL_USE_INTERPRETER=1 (eval blocks use interpreter):

op/lex_assign.t: 320/353 → 323/353 (+3 tests, 91.5% pass rate)

• Fixes tests 57, 144, 145, 146
• Remaining 30 failures need more operator implementations

op/packagev.t: 218/307 (71.0% - same for both backends)

• $VERSION now set correctly in interpreter

Pure interpreter mode (JPERL_INTERPRETER=1):

op/lex_assign.t: 346/353 (98.0% - same as compiler)
op/packagev.t: 218/307 (71.0% - same as compiler)

Architecture

All fixes follow the compiler pattern:

• Direct opcode emission for operators
• GlobalVariable for package VERSION
• Consistent behavior between interpreter and compiler modes

Remaining Work

For full JPERL_EVAL_USE_INTERPRETER=1 support in op/lex_assign.t, still need:

Missing operators in eval blocks (18 more):

• File ops: chmod, umask, unlink, utime, rename, link, readlink
• I/O: qx (backticks), getc, fileno
• System: system, caller
• Hash: each
• String/data: pack, vec, crypt
• Time: localtime, gmtime

These would improve the pass rate from 91.5% to ~98%.

Related

Part of ongoing work to improve interpreter feature parity when eval blocks are executed in interpreter mode.

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