ruby.git - The Ruby Programming Language

Age	Commit message (Collapse)	Author
2020-10-08	Fix lldb disassembler so it works with core files	Aaron Patterson
	This fixes the lldb disassembler script so that it doesn't need a live process when disassembling rb_iseq_t. I also added the PC to the output so you can tell what the VM is executing when it crashed. For example: ``` (lldb) rbdisasm ec->cfp->iseq PC IDX insn_name(operands) 0x56039f0a1720 0000 nop 0x56039f0a1728 0001 getlocal_WC_1( 5 ) 0x56039f0a1738 0003 branchunless( 7 ) 0x56039f0a1748 0005 getlocal_WC_0( 3 ) 0x56039f0a1758 0007 putstring( (VALUE)0x56039f0c7eb8 ) 0x56039f0a1768 0009 opt_send_without_block( (struct rb_call_data )0x56039f09f140 ) 0x56039f0a1778 0011 pop 0x56039f0a1780 0012 getglobal( ID: 0x7fd7 ) 0x56039f0a1790 0014 branchunless( 7 ) 0x56039f0a17a0 0016 getlocal_WC_0( 3 ) 0x56039f0a17b0 0018 putstring( (VALUE)0x56039f0c7e90 ) 0x56039f0a17c0 0020 opt_send_without_block( (struct rb_call_data )0x56039f09f150 ) 0x56039f0a17d0 0022 pop 0x56039f0a17d8 0023 getlocal_WC_0( 3 ) 0x56039f0a17e8 0025 putobject( (VALUE)0x56039f0c7e68 ) 0x56039f0a17f8 0027 getlocal_WC_1( 6 ) 0x56039f0a1808 0029 dup 0x56039f0a1810 0030 checktype( 5 ) 0x56039f0a1820 0032 branchif( 4 ) 0x56039f0a1830 0034 dup 0x56039f0a1838 0035 opt_send_without_block( (struct rb_call_data )0x56039f09f160 ) 0x56039f0a1848 0037 tostring 0x56039f0a1850 0038 putobject( (VALUE)0x56039f0c7e40 ) 0x56039f0a1860 0040 concatstrings( 3 ) 0x56039f0a1870 0042 opt_send_without_block( (struct rb_call_data )0x56039f09f170 ) 0x56039f0a1880 0044 nop 0x56039f0a1888 0045 leave (lldb) p ec->cfp->pc (const VALUE *) $146 = 0x000056039f0a1848 ``` Here we can see the VM is currently executing `opt_send_without_block` (because the PC is one ahead of the current instruction)
2020-09-22	Rudimentary support for disassembling rb_iseq_t	Aaron Patterson
	I need to disassemble instruction sequences while debugging, so I wrote this. Usage is like this: ``` (lldb) p iseq (rb_iseq_t ) $147 = 0x0000000101068400 (lldb) rbdisasm iseq 0000 putspecialobject( 3 ) 0002 putnil 0003 defineclass( ID: 0x560b, (rb_iseq_t )0x1010681d0, 2 ) 0007 pop 0008 putspecialobject( 3 ) 0010 putnil 0011 defineclass( ID: 0x56eb, (rb_iseq_t *)0x101063b58, 2 ) 0015 leave ``` Also thanks a ton to @kivikakk helping me figure out how to navigate LLDB's Python 😆 Notes: Merged: https://github.com/ruby/ruby/pull/3554