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dwarf/op: return register values when they are the only piece

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When there is a single piece and it's a register value just return it.
This is important for clang compiled programs which will use DW_OP_regN
to specify the value of the frame base.
This commit is contained in:
aarzilli 2020-04-08 15:44:06 +02:00 committed by Derek Parker
parent c078223d56
commit 96890bbe1e
1 changed files with 8 additions and 1 deletions
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9
pkg/dwarf/op/op.go
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@ -54,7 +54,11 @@ func ExecuteStackProgram(regs DwarfRegisters, instructions []byte, ptrSize int)
}
opcode := Opcode(opcodeByte)
if ctxt.reg && opcode != DW_OP_piece {
break
// last opcode was DW_OP_regN and next one isn't DW_OP_piece so convert
// the register piece into a stack value.
ctxt.stack = append(ctxt.stack, int64(regs.Uint64Val(ctxt.pieces[len(ctxt.pieces)-1].RegNum)))
ctxt.pieces = ctxt.pieces[:len(ctxt.pieces)-1]
ctxt.reg = false
}
fn, ok := oplut[opcode]
if !ok {
@ -68,6 +72,9 @@ func ExecuteStackProgram(regs DwarfRegisters, instructions []byte, ptrSize int)
}
if ctxt.pieces != nil {
if len(ctxt.pieces) == 1 && ctxt.pieces[0].IsRegister {
return int64(regs.Uint64Val(ctxt.pieces[0].RegNum)), ctxt.pieces, nil
}
return 0, ctxt.pieces, nil
}