Displaying 4 results from an estimated 4 matches for "dw_op_llvm_argn".
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dw_op_llvm_arg
2020 Jul 07
2
Defining the DIExpression operator DW_OP_LLVM_arg
Currently, two patches undergoing review wish to add a new operator for LLVM's DIExpression: D70642[0], and D82363[1]. Though both of these cases use the same name, the operators have different meanings: in the former, it has the form `DW_OP_LLVM_argN` where N is in [0-7], and represents the Nth argument of the containing intrinsic; its purpose is to enable the intrinsic @llvm.dbg.derefval, which represents implicit pointers. In the latter, it has the form `DW_OP_LLVM_arg, N`, where N >= 0, and represents the Nth value in a variadic debug val...
2020 Jul 08
3
Defining the DIExpression operator DW_OP_LLVM_arg
...all operands of a DBG_VALUE to the stack, followed by a combination of DW_OP_dup, DW_OP_pick, DW_OP_swap, DW_OP_rot, and DW_OP_over. However, the resulting expressions can get very long and unwieldy and it is easier to generate efficient DWARF from DIExpressions that explicitly refer to arguments. DW_OP_LLVM_argN has the advantage of using less memory, at the cost of limiting the number of arguments to a hardcoded value.
I'd also add that since `DW_OP_pick N` picks the Nth argument from the top of the stack rather than the bottom, using it would require us to know how many elements are on the stack at...
2020 Jul 08
2
Defining the DIExpression operator DW_OP_LLVM_arg
...all operands of a DBG_VALUE to the stack, followed by a combination of DW_OP_dup, DW_OP_pick, DW_OP_swap, DW_OP_rot, and DW_OP_over. However, the resulting expressions can get very long and unwieldy and it is easier to generate efficient DWARF from DIExpressions that explicitly refer to arguments. DW_OP_LLVM_argN has the advantage of using less memory, at the cost of limiting the number of arguments to a hardcoded value.
> >
> > I'd also add that since `DW_OP_pick N` picks the Nth argument from the top of the stack rather than the bottom, using it would require us to know how many elements a...
2020 Jul 08
2
Defining the DIExpression operator DW_OP_LLVM_arg
...all operands of a DBG_VALUE to the stack, followed by a combination of DW_OP_dup, DW_OP_pick, DW_OP_swap, DW_OP_rot, and DW_OP_over. However, the resulting expressions can get very long and unwieldy and it is easier to generate efficient DWARF from DIExpressions that explicitly refer to arguments. DW_OP_LLVM_argN has the advantage of using less memory, at the cost of limiting the number of arguments to a hardcoded value.
> >>>
> >>> I'd also add that since `DW_OP_pick N` picks the Nth argument from the top of the stack rather than the bottom, using it would require us to know how...