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| 1 | +//===----------------------------------------------------------------------===// |
| 2 | +// |
| 3 | +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | +// See https://llvm.org/LICENSE.txt for license information. |
| 5 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | +// |
| 7 | +//===----------------------------------------------------------------------===// |
| 8 | + |
| 9 | +#include "lldb/Utility/VirtualDataExtractor.h" |
| 10 | +#include <cassert> |
| 11 | + |
| 12 | +using namespace lldb; |
| 13 | +using namespace lldb_private; |
| 14 | + |
| 15 | +VirtualDataExtractor::VirtualDataExtractor(const void *data, |
| 16 | + offset_t data_length, |
| 17 | + ByteOrder byte_order, |
| 18 | + uint32_t addr_size, |
| 19 | + LookupTable lookup_table) |
| 20 | + : DataExtractor(data, data_length, byte_order, addr_size), |
| 21 | + m_lookup_table(std::move(lookup_table)) { |
| 22 | + m_lookup_table.Sort(); |
| 23 | +} |
| 24 | + |
| 25 | +VirtualDataExtractor::VirtualDataExtractor(const DataBufferSP &data_sp, |
| 26 | + ByteOrder byte_order, |
| 27 | + uint32_t addr_size, |
| 28 | + LookupTable lookup_table) |
| 29 | + : DataExtractor(data_sp, byte_order, addr_size), |
| 30 | + m_lookup_table(std::move(lookup_table)) { |
| 31 | + m_lookup_table.Sort(); |
| 32 | +} |
| 33 | + |
| 34 | +const VirtualDataExtractor::LookupTable::Entry * |
| 35 | +VirtualDataExtractor::FindEntry(offset_t virtual_addr) const { |
| 36 | + // Use RangeDataVector's binary search instead of linear search. |
| 37 | + return m_lookup_table.FindEntryThatContains(virtual_addr); |
| 38 | +} |
| 39 | + |
| 40 | +bool VirtualDataExtractor::ValidateVirtualRead(offset_t virtual_addr, |
| 41 | + offset_t length) const { |
| 42 | + const LookupTable::Entry *entry = FindEntry(virtual_addr); |
| 43 | + if (!entry) |
| 44 | + return false; |
| 45 | + |
| 46 | + // Assert that the read does not cross entry boundaries. |
| 47 | + // RangeData.Contains() checks if a range is fully contained. |
| 48 | + assert(entry->Contains(LookupTable::Range(virtual_addr, length)) && |
| 49 | + "Read crosses lookup table entry boundary"); |
| 50 | + |
| 51 | + // Also validate that the physical offset is within the data buffer. |
| 52 | + // RangeData.data contains the physical offset. |
| 53 | + offset_t physical_offset = entry->data + (virtual_addr - entry->base); |
| 54 | + return ValidOffsetForDataOfSize(physical_offset, length); |
| 55 | +} |
| 56 | + |
| 57 | +const void *VirtualDataExtractor::GetData(offset_t *offset_ptr, |
| 58 | + offset_t length) const { |
| 59 | + // Override to treat offset as virtual address. |
| 60 | + if (!offset_ptr) |
| 61 | + return nullptr; |
| 62 | + |
| 63 | + offset_t virtual_addr = *offset_ptr; |
| 64 | + |
| 65 | + if (!ValidateVirtualRead(virtual_addr, length)) |
| 66 | + return nullptr; |
| 67 | + |
| 68 | + const LookupTable::Entry *entry = FindEntry(virtual_addr); |
| 69 | + assert(entry && "ValidateVirtualRead should have found an entry"); |
| 70 | + |
| 71 | + offset_t physical_offset = entry->data + (virtual_addr - entry->base); |
| 72 | + // Use base class PeekData directly to avoid recursion. |
| 73 | + const void *result = DataExtractor::PeekData(physical_offset, length); |
| 74 | + |
| 75 | + if (result) { |
| 76 | + // Advance the virtual offset pointer. |
| 77 | + *offset_ptr += length; |
| 78 | + } |
| 79 | + |
| 80 | + return result; |
| 81 | +} |
| 82 | + |
| 83 | +const uint8_t *VirtualDataExtractor::PeekData(offset_t offset, |
| 84 | + offset_t length) const { |
| 85 | + // Override to treat offset as virtual address. |
| 86 | + if (!ValidateVirtualRead(offset, length)) |
| 87 | + return nullptr; |
| 88 | + |
| 89 | + const LookupTable::Entry *entry = FindEntry(offset); |
| 90 | + assert(entry && "ValidateVirtualRead should have found an entry"); |
| 91 | + |
| 92 | + offset_t physical_offset = entry->data + (offset - entry->base); |
| 93 | + // Use the base class PeekData with the physical offset. |
| 94 | + return DataExtractor::PeekData(physical_offset, length); |
| 95 | +} |
| 96 | + |
| 97 | +uint8_t VirtualDataExtractor::GetU8_unchecked(offset_t *offset_ptr) const { |
| 98 | + offset_t virtual_addr = *offset_ptr; |
| 99 | + const LookupTable::Entry *entry = FindEntry(virtual_addr); |
| 100 | + assert(entry && "Unchecked methods require valid virtual address"); |
| 101 | + |
| 102 | + offset_t physical_offset = entry->data + (virtual_addr - entry->base); |
| 103 | + uint8_t result = DataExtractor::GetU8_unchecked(&physical_offset); |
| 104 | + *offset_ptr += 1; |
| 105 | + return result; |
| 106 | +} |
| 107 | + |
| 108 | +uint16_t VirtualDataExtractor::GetU16_unchecked(offset_t *offset_ptr) const { |
| 109 | + offset_t virtual_addr = *offset_ptr; |
| 110 | + const LookupTable::Entry *entry = FindEntry(virtual_addr); |
| 111 | + assert(entry && "Unchecked methods require valid virtual address"); |
| 112 | + |
| 113 | + offset_t physical_offset = entry->data + (virtual_addr - entry->base); |
| 114 | + uint16_t result = DataExtractor::GetU16_unchecked(&physical_offset); |
| 115 | + *offset_ptr += 2; |
| 116 | + return result; |
| 117 | +} |
| 118 | + |
| 119 | +uint32_t VirtualDataExtractor::GetU32_unchecked(offset_t *offset_ptr) const { |
| 120 | + offset_t virtual_addr = *offset_ptr; |
| 121 | + const LookupTable::Entry *entry = FindEntry(virtual_addr); |
| 122 | + assert(entry && "Unchecked methods require valid virtual address"); |
| 123 | + |
| 124 | + offset_t physical_offset = entry->data + (virtual_addr - entry->base); |
| 125 | + uint32_t result = DataExtractor::GetU32_unchecked(&physical_offset); |
| 126 | + *offset_ptr += 4; |
| 127 | + return result; |
| 128 | +} |
| 129 | + |
| 130 | +uint64_t VirtualDataExtractor::GetU64_unchecked(offset_t *offset_ptr) const { |
| 131 | + offset_t virtual_addr = *offset_ptr; |
| 132 | + const LookupTable::Entry *entry = FindEntry(virtual_addr); |
| 133 | + assert(entry && "Unchecked methods require valid virtual address"); |
| 134 | + |
| 135 | + offset_t physical_offset = entry->data + (virtual_addr - entry->base); |
| 136 | + uint64_t result = DataExtractor::GetU64_unchecked(&physical_offset); |
| 137 | + *offset_ptr += 8; |
| 138 | + return result; |
| 139 | +} |
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