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| //===-- LinuxProcMaps.cpp ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "LinuxProcMaps.h"
#include "llvm/ADT/StringRef.h"
#include "lldb/Target/MemoryRegionInfo.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StringExtractor.h"
using namespace lldb_private;
static Status
ParseMemoryRegionInfoFromProcMapsLine(llvm::StringRef maps_line,
MemoryRegionInfo &memory_region_info) {
memory_region_info.Clear();
StringExtractor line_extractor(maps_line);
// Format: {address_start_hex}-{address_end_hex} perms offset dev inode
// pathname perms: rwxp (letter is present if set, '-' if not, final
// character is p=private, s=shared).
// Parse out the starting address
lldb::addr_t start_address = line_extractor.GetHexMaxU64(false, 0);
// Parse out hyphen separating start and end address from range.
if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != '-'))
return Status(
"malformed /proc/{pid}/maps entry, missing dash between address range");
// Parse out the ending address
lldb::addr_t end_address = line_extractor.GetHexMaxU64(false, start_address);
// Parse out the space after the address.
if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != ' '))
return Status(
"malformed /proc/{pid}/maps entry, missing space after range");
// Save the range.
memory_region_info.GetRange().SetRangeBase(start_address);
memory_region_info.GetRange().SetRangeEnd(end_address);
// Any memory region in /proc/{pid}/maps is by definition mapped into the
// process.
memory_region_info.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
// Parse out each permission entry.
if (line_extractor.GetBytesLeft() < 4)
return Status("malformed /proc/{pid}/maps entry, missing some portion of "
"permissions");
// Handle read permission.
const char read_perm_char = line_extractor.GetChar();
if (read_perm_char == 'r')
memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
else if (read_perm_char == '-')
memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
else
return Status("unexpected /proc/{pid}/maps read permission char");
// Handle write permission.
const char write_perm_char = line_extractor.GetChar();
if (write_perm_char == 'w')
memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
else if (write_perm_char == '-')
memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
else
return Status("unexpected /proc/{pid}/maps write permission char");
// Handle execute permission.
const char exec_perm_char = line_extractor.GetChar();
if (exec_perm_char == 'x')
memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
else if (exec_perm_char == '-')
memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
else
return Status("unexpected /proc/{pid}/maps exec permission char");
line_extractor.GetChar(); // Read the private bit
line_extractor.SkipSpaces(); // Skip the separator
line_extractor.GetHexMaxU64(false, 0); // Read the offset
line_extractor.GetHexMaxU64(false, 0); // Read the major device number
line_extractor.GetChar(); // Read the device id separator
line_extractor.GetHexMaxU64(false, 0); // Read the major device number
line_extractor.SkipSpaces(); // Skip the separator
line_extractor.GetU64(0, 10); // Read the inode number
line_extractor.SkipSpaces();
const char *name = line_extractor.Peek();
if (name)
memory_region_info.SetName(name);
return Status();
}
void lldb_private::ParseLinuxMapRegions(llvm::StringRef linux_map,
LinuxMapCallback const &callback) {
llvm::StringRef lines(linux_map);
llvm::StringRef line;
while (!lines.empty()) {
std::tie(line, lines) = lines.split('\n');
MemoryRegionInfo region;
Status error = ParseMemoryRegionInfoFromProcMapsLine(line, region);
if (!callback(region, error))
break;
}
}
|