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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
//===-- LinuxProcMaps.cpp ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "LinuxProcMaps.h"
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#include "llvm/ADT/StringRef.h"
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#include "lldb/Target/MemoryRegionInfo.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/StringExtractor.h"
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using namespace lldb_private;
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static Status
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ParseMemoryRegionInfoFromProcMapsLine(llvm::StringRef maps_line,
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MemoryRegionInfo &memory_region_info) {
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memory_region_info.Clear();
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StringExtractor line_extractor(maps_line);
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// Format: {address_start_hex}-{address_end_hex} perms offset dev inode
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// pathname perms: rwxp (letter is present if set, '-' if not, final
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// character is p=private, s=shared).
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// Parse out the starting address
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lldb::addr_t start_address = line_extractor.GetHexMaxU64(false, 0);
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// Parse out hyphen separating start and end address from range.
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if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != '-'))
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return Status(
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"malformed /proc/{pid}/maps entry, missing dash between address range");
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// Parse out the ending address
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lldb::addr_t end_address = line_extractor.GetHexMaxU64(false, start_address);
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// Parse out the space after the address.
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if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != ' '))
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return Status(
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"malformed /proc/{pid}/maps entry, missing space after range");
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// Save the range.
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memory_region_info.GetRange().SetRangeBase(start_address);
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memory_region_info.GetRange().SetRangeEnd(end_address);
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// Any memory region in /proc/{pid}/maps is by definition mapped into the
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// process.
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memory_region_info.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
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// Parse out each permission entry.
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if (line_extractor.GetBytesLeft() < 4)
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return Status("malformed /proc/{pid}/maps entry, missing some portion of "
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"permissions");
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// Handle read permission.
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const char read_perm_char = line_extractor.GetChar();
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if (read_perm_char == 'r')
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memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
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else if (read_perm_char == '-')
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memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
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else
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return Status("unexpected /proc/{pid}/maps read permission char");
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// Handle write permission.
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const char write_perm_char = line_extractor.GetChar();
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if (write_perm_char == 'w')
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memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
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else if (write_perm_char == '-')
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memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
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else
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return Status("unexpected /proc/{pid}/maps write permission char");
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// Handle execute permission.
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const char exec_perm_char = line_extractor.GetChar();
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if (exec_perm_char == 'x')
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memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
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else if (exec_perm_char == '-')
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memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
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else
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return Status("unexpected /proc/{pid}/maps exec permission char");
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line_extractor.GetChar(); // Read the private bit
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line_extractor.SkipSpaces(); // Skip the separator
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line_extractor.GetHexMaxU64(false, 0); // Read the offset
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line_extractor.GetHexMaxU64(false, 0); // Read the major device number
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line_extractor.GetChar(); // Read the device id separator
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line_extractor.GetHexMaxU64(false, 0); // Read the major device number
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line_extractor.SkipSpaces(); // Skip the separator
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line_extractor.GetU64(0, 10); // Read the inode number
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line_extractor.SkipSpaces();
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const char *name = line_extractor.Peek();
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if (name)
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memory_region_info.SetName(name);
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return Status();
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}
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void lldb_private::ParseLinuxMapRegions(llvm::StringRef linux_map,
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LinuxMapCallback const &callback) {
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llvm::StringRef lines(linux_map);
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llvm::StringRef line;
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while (!lines.empty()) {
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std::tie(line, lines) = lines.split('\n');
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MemoryRegionInfo region;
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Status error = ParseMemoryRegionInfoFromProcMapsLine(line, region);
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if (!callback(region, error))
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break;
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}
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}
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