From 2ed3fb102e82ad2127a78a905dce5acf55afc729 Mon Sep 17 00:00:00 2001 From: Mark Kettenis Date: Mon, 27 Dec 2004 13:17:06 +0000 Subject: GDB 6.3 (excluding .info files) --- gnu/usr.bin/binutils/gdb/dwarf2expr.h | 43 +++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'gnu/usr.bin/binutils/gdb/dwarf2expr.h') diff --git a/gnu/usr.bin/binutils/gdb/dwarf2expr.h b/gnu/usr.bin/binutils/gdb/dwarf2expr.h index 0a60edb8237..f22d085273d 100644 --- a/gnu/usr.bin/binutils/gdb/dwarf2expr.h +++ b/gnu/usr.bin/binutils/gdb/dwarf2expr.h @@ -74,6 +74,49 @@ struct dwarf_expr_context /* Non-zero if the result is in a register. The register number will be on the expression stack. */ int in_reg; + + /* An array of pieces. PIECES points to its first element; + NUM_PIECES is its length. + + Each time DW_OP_piece is executed, we add a new element to the + end of this array, recording the current top of the stack, the + current in_reg flag, and the size given as the operand to + DW_OP_piece. We then pop the top value from the stack, clear the + in_reg flag, and resume evaluation. + + The Dwarf spec doesn't say whether DW_OP_piece pops the top value + from the stack. We do, ensuring that clients of this interface + expecting to see a value left on the top of the stack (say, code + evaluating frame base expressions or CFA's specified with + DW_CFA_def_cfa_expression) will get an error if the expression + actually marks all the values it computes as pieces. + + If an expression never uses DW_OP_piece, num_pieces will be zero. + (It would be nice to present these cases as expressions yielding + a single piece, with in_reg clear, so that callers need not + distinguish between the no-DW_OP_piece and one-DW_OP_piece cases. + But expressions with no DW_OP_piece operations have no value to + place in a piece's 'size' field; the size comes from the + surrounding data. So the two cases need to be handled + separately.) */ + int num_pieces; + struct dwarf_expr_piece *pieces; +}; + + +/* A piece of an object, as recorded by DW_OP_piece. */ +struct dwarf_expr_piece +{ + /* If IN_REG is zero, then the piece is in memory, and VALUE is its address. + If IN_REG is non-zero, then the piece is in a register, and VALUE + is the register number. */ + int in_reg; + + /* This piece's address or register number. */ + CORE_ADDR value; + + /* The length of the piece, in bytes. */ + ULONGEST size; }; struct dwarf_expr_context *new_dwarf_expr_context (void); -- cgit v1.2.3