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. _______________________________________________ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
