337 lines
10 KiB
C++
337 lines
10 KiB
C++
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// Copyright (c) 2013 Austin T. Clements. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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#include "internal.hh"
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#include <cstring>
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using namespace std;
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DWARFPP_BEGIN_NAMESPACE
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value::value(const unit *cu,
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DW_AT name, DW_FORM form, type typ, section_offset offset)
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: cu(cu), form(form), typ(typ), offset(offset) {
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if (form == DW_FORM::indirect)
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resolve_indirect(name);
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}
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section_offset
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value::get_section_offset() const
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{
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return cu->get_section_offset() + offset;
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}
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taddr
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value::as_address() const
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{
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if (form != DW_FORM::addr)
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throw value_type_mismatch("cannot read " + to_string(typ) + " as address");
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cursor cur(cu->data(), offset);
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return cur.address();
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}
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const void *
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value::as_block(size_t *size_out) const
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{
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// XXX Blocks can contain all sorts of things, including
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// references, which couldn't be resolved by callers in the
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// current minimal API.
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cursor cur(cu->data(), offset);
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switch (form) {
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case DW_FORM::block1:
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*size_out = cur.fixed<uint8_t>();
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break;
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case DW_FORM::block2:
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*size_out = cur.fixed<uint16_t>();
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break;
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case DW_FORM::block4:
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*size_out = cur.fixed<uint32_t>();
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break;
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case DW_FORM::block:
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case DW_FORM::exprloc:
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*size_out = cur.uleb128();
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break;
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as block");
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}
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cur.ensure(*size_out);
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return cur.pos;
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}
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uint64_t
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value::as_uconstant() const
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{
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cursor cur(cu->data(), offset);
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switch (form) {
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case DW_FORM::data1:
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return cur.fixed<uint8_t>();
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case DW_FORM::data2:
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return cur.fixed<uint16_t>();
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case DW_FORM::data4:
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return cur.fixed<uint32_t>();
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case DW_FORM::data8:
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return cur.fixed<uint64_t>();
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case DW_FORM::udata:
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return cur.uleb128();
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as uconstant");
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}
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}
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int64_t
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value::as_sconstant() const
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{
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cursor cur(cu->data(), offset);
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switch (form) {
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case DW_FORM::data1:
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return cur.fixed<int8_t>();
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case DW_FORM::data2:
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return cur.fixed<int16_t>();
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case DW_FORM::data4:
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return cur.fixed<int32_t>();
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case DW_FORM::data8:
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return cur.fixed<int64_t>();
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case DW_FORM::sdata:
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return cur.sleb128();
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as sconstant");
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}
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}
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expr
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value::as_exprloc() const
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{
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cursor cur(cu->data(), offset);
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size_t size;
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// Prior to DWARF 4, exprlocs were encoded as blocks.
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switch (form) {
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case DW_FORM::exprloc:
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case DW_FORM::block:
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size = cur.uleb128();
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break;
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case DW_FORM::block1:
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size = cur.fixed<uint8_t>();
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break;
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case DW_FORM::block2:
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size = cur.fixed<uint16_t>();
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break;
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case DW_FORM::block4:
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size = cur.fixed<uint32_t>();
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break;
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as exprloc");
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}
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return expr(cu, cur.get_section_offset(), size);
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}
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bool
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value::as_flag() const
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{
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switch (form) {
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case DW_FORM::flag: {
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cursor cur(cu->data(), offset);
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return cur.fixed<ubyte>() != 0;
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}
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case DW_FORM::flag_present:
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return true;
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as flag");
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}
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}
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rangelist
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value::as_rangelist() const
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{
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section_offset off = as_sec_offset();
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// The compilation unit may not have a base address. In this
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// case, the first entry in the range list must be a base
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// address entry, but we'll just assume 0 for the initial base
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// address.
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die cudie = cu->root();
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taddr cu_low_pc = cudie.has(DW_AT::low_pc) ? at_low_pc(cudie) : 0;
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auto sec = cu->get_dwarf().get_section(section_type::ranges);
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auto cusec = cu->data();
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return rangelist(sec, off, cusec->addr_size, cu_low_pc);
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}
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die
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value::as_reference() const
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{
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section_offset off;
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// XXX Would be nice if we could avoid this. The cursor is
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// all overhead here.
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cursor cur(cu->data(), offset);
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switch (form) {
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case DW_FORM::ref1:
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off = cur.fixed<ubyte>();
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break;
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case DW_FORM::ref2:
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off = cur.fixed<uhalf>();
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break;
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case DW_FORM::ref4:
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off = cur.fixed<uword>();
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break;
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case DW_FORM::ref8:
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off = cur.fixed<uint64_t>();
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break;
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case DW_FORM::ref_udata:
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off = cur.uleb128();
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break;
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case DW_FORM::ref_addr: {
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off = cur.offset();
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// These seem to be extremely rare in practice (I
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// haven't been able to get gcc to produce a
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// ref_addr), so it's not worth caching this lookup.
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const compilation_unit *base_cu = nullptr;
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for (auto &file_cu : cu->get_dwarf().compilation_units()) {
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if (file_cu.get_section_offset() > off)
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break;
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base_cu = &file_cu;
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}
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die d(base_cu);
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d.read(off - base_cu->get_section_offset());
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return d;
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}
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case DW_FORM::ref_sig8: {
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uint64_t sig = cur.fixed<uint64_t>();
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try {
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return cu->get_dwarf().get_type_unit(sig).type();
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} catch (std::out_of_range &e) {
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throw format_error("unknown type signature 0x" + to_hex(sig));
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}
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}
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as reference");
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}
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die d(cu);
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d.read(off);
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return d;
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}
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void
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value::as_string(string &buf) const
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{
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size_t size;
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const char *p = as_cstr(&size);
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buf.resize(size);
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memmove(&buf.front(), p, size);
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}
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string
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value::as_string() const
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{
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size_t size;
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const char *s = as_cstr(&size);
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return string(s, size);
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}
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const char *
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value::as_cstr(size_t *size_out) const
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{
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cursor cur(cu->data(), offset);
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switch (form) {
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case DW_FORM::string:
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return cur.cstr(size_out);
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case DW_FORM::strp: {
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section_offset off = cur.offset();
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cursor scur(cu->get_dwarf().get_section(section_type::str), off);
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return scur.cstr(size_out);
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}
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as string");
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}
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}
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section_offset
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value::as_sec_offset() const
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{
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// Prior to DWARF 4, sec_offsets were encoded as data4 or
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// data8.
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cursor cur(cu->data(), offset);
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switch (form) {
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case DW_FORM::data4:
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return cur.fixed<uint32_t>();
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case DW_FORM::data8:
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return cur.fixed<uint64_t>();
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case DW_FORM::sec_offset:
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return cur.offset();
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default:
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throw value_type_mismatch("cannot read " + to_string(typ) + " as sec_offset");
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}
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}
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void
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value::resolve_indirect(DW_AT name)
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{
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if (form != DW_FORM::indirect)
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return;
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cursor c(cu->data(), offset);
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DW_FORM form;
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do {
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form = (DW_FORM)c.uleb128();
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} while (form == DW_FORM::indirect);
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typ = attribute_spec(name, form).type;
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offset = c.get_section_offset();
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}
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string
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to_string(const value &v)
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{
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switch (v.get_type()) {
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case value::type::invalid:
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return "<invalid value type>";
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case value::type::address:
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return "0x" + to_hex(v.as_address());
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case value::type::block: {
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size_t size;
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const char *b = (const char*)v.as_block(&size);
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string res = ::to_string(size) + " byte block:";
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for (size_t pos = 0; pos < size; ++pos) {
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res += ' ';
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res += to_hex(b[pos]);
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}
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return res;
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}
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case value::type::constant:
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return "0x" + to_hex(v.as_uconstant());
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case value::type::uconstant:
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return ::to_string(v.as_uconstant());
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case value::type::sconstant:
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return ::to_string(v.as_sconstant());
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case value::type::exprloc:
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// XXX
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return "<exprloc>";
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case value::type::flag:
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return v.as_flag() ? "true" : "false";
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case value::type::line:
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return "<line 0x" + to_hex(v.as_sec_offset()) + ">";
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case value::type::loclist:
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return "<loclist 0x" + to_hex(v.as_sec_offset()) + ">";
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case value::type::mac:
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return "<mac 0x" + to_hex(v.as_sec_offset()) + ">";
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case value::type::rangelist:
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return "<rangelist 0x" + to_hex(v.as_sec_offset()) + ">";
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case value::type::reference: {
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die d = v.as_reference();
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auto tu = dynamic_cast<const type_unit*>(&d.get_unit());
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if (tu)
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return "<.debug_types+0x" + to_hex(d.get_section_offset()) + ">";
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return "<0x" + to_hex(d.get_section_offset()) + ">";
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}
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case value::type::string:
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return v.as_string();
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}
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return "<unexpected value type " + to_string(v.get_type()) + ">";
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}
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DWARFPP_END_NAMESPACE
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