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[platform/framework/web/chromium-efl.git] / courgette / disassembler_win32_x86.cc
1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "courgette/disassembler_win32_x86.h"
6
7 #include <algorithm>
8
9 #include "base/logging.h"
10 #include "courgette/assembly_program.h"
11 #include "courgette/courgette.h"
12 #include "courgette/rel32_finder_x86.h"
13
14 #if COURGETTE_HISTOGRAM_TARGETS
15 #include <iostream>
16 #endif
17
18 namespace courgette {
19
20 DisassemblerWin32X86::DisassemblerWin32X86(const uint8_t* start, size_t length)
21     : DisassemblerWin32(start, length) {}
22
23 RVA DisassemblerWin32X86::PointerToTargetRVA(const uint8_t* p) const {
24   return Address32ToRVA(Read32LittleEndian(p));
25 }
26
27 RVA DisassemblerWin32X86::Address32ToRVA(uint32_t address) const {
28   if (address < image_base() || address >= image_base() + size_of_image_)
29     return kNoRVA;
30   return static_cast<RVA>(address - image_base());
31 }
32
33 CheckBool DisassemblerWin32X86::EmitAbs(Label* label,
34                                         InstructionReceptor* receptor) const {
35   return receptor->EmitAbs32(label);
36 }
37
38 void DisassemblerWin32X86::ParseRel32RelocsFromSection(const Section* section) {
39   // TODO(sra): use characteristic.
40   bool isCode = strcmp(section->name, ".text") == 0;
41   if (!isCode)
42     return;
43
44   FileOffset start_file_offset = section->file_offset_of_raw_data;
45   // |virtual_size < size_of_raw_data| is possible. In this case, disassembly
46   // should not proceed beyond |virtual_size|, so rel32 location RVAs remain
47   // translatable to file offsets.
48   FileOffset end_file_offset =
49       start_file_offset +
50       std::min(section->virtual_size, section->size_of_raw_data);
51
52   const uint8_t* start_pointer = FileOffsetToPointer(start_file_offset);
53   const uint8_t* end_pointer = FileOffsetToPointer(end_file_offset);
54
55   RVA start_rva = FileOffsetToRVA(start_file_offset);
56   RVA end_rva = start_rva + section->virtual_size;
57
58   Rel32FinderX86 finder(
59       base_relocation_table().address_,
60       base_relocation_table().address_ + base_relocation_table().size_);
61   finder.Find(start_pointer, end_pointer, start_rva, end_rva, abs32_locations_);
62   finder.SwapRel32Locations(&rel32_locations_);
63
64 #if COURGETTE_HISTOGRAM_TARGETS
65   DCHECK(rel32_target_rvas_.empty());
66   finder.SwapRel32TargetRVAs(&rel32_target_rvas_);
67 #endif
68 }
69
70 }  // namespace courgette