> On Mar 17, 2017, at 2:49 PM, David Anderson <dave...@linuxmail.org> wrote: > > On 03/17/2017 01:18 PM, Adrian Prantl wrote: >> Are these two expressions equivalent? >> 1. DW_OP_breg1 0 DW_OP_breg2 0 DW_OP_plus DW_OP_stack_value >> 2. DW_OP_reg1 DW_OP_reg2 DW_OP_plus DW_OP_stack_value > > In DW4 (DW5 has same text) > These operations name a register location. To fetch the contents of a > register, it is necessary to > use one of the register based addressing operations, such as DW_OP_bregx > (see Section > 2.5.1.2). > > To me that means that 2. above cannot work. > > In 1. the value of DW_OP_breg1 0 > (for example) is pushed on the stack. > > Can someone point out > where the standard (4 or 5 or?) states the push happens? > Ah yes: DW5: > > 2.5.1.2 Register Values > > The following operations push a value onto the stack > that is either the contents of a register or the result > of adding the contents of a register to a given > signed offset. DW_OP_regval_type pushes the > contents of the register together with the given > base type, while the other operations push the > result of adding the contents of a register > to a given signed offset together with the generic type. > > Notice that DW_OP_reg<n> is NOT in the list where something > gets pushed on the stack. > > Comments/correction? > DavidA.
Would you say that the example in Appendix D, pg 291, line 23 DW_OP_entry_value 1 DW_OP_reg1 DW_OP_stack_value is incorrect, because DW_OP_ref is not allowed outside of a register location description? -- adrian _______________________________________________ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
