================ @@ -0,0 +1,146 @@ +//===-- WatchpointAlgorithms.cpp ------------------------------------------===// +// +// 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 "lldb/Breakpoint/WatchpointAlgorithms.h" +#include "lldb/Breakpoint/WatchpointResource.h" +#include "lldb/Target/Process.h" +#include "lldb/Utility/ArchSpec.h" + +#include <utility> +#include <vector> + +using namespace lldb; +using namespace lldb_private; + +std::vector<WatchpointResourceSP> +WatchpointAlgorithms::AtomizeWatchpointRequest( + addr_t addr, size_t size, bool read, bool write, + WatchpointHardwareFeature supported_features, ArchSpec &arch) { + + std::vector<std::pair<addr_t, size_t>> entries; + + if (supported_features & + WatchpointHardwareFeature::eWatchpointHardwareArmMASK) { + entries = + PowerOf2Watchpoints(addr, size, + /* min_byte_size */ 1, + /* max_byte_size */ INT32_MAX, + /* address_byte_size */ arch.GetAddressByteSize()); + } else { + // As a fallback, assume we can watch any power-of-2 + // number of bytes up through the size of an address in the target. + entries = + PowerOf2Watchpoints(addr, size, + /* min_byte_size */ 1, + /* max_byte_size */ arch.GetAddressByteSize(), + /* address_byte_size */ arch.GetAddressByteSize()); + } + + std::vector<WatchpointResourceSP> resources; + for (std::pair<addr_t, size_t> &ent : entries) { + addr_t addr = std::get<0>(ent); + size_t size = std::get<1>(ent); + WatchpointResourceSP wp_res_sp = + std::make_shared<WatchpointResource>(addr, size, read, write); + resources.push_back(wp_res_sp); + } + + return resources; +} + +/// Convert a user's watchpoint request (\a user_addr and \a user_size) +/// into hardware watchpoints, for a target that can watch a power-of-2 +/// region of memory (1, 2, 4, 8, etc), aligned to that same power-of-2 +/// memory address. +/// +/// If a user asks to watch 4 bytes at address 0x1002 (0x1002-0x1005 +/// inclusive) we can implement this with two 2-byte watchpoints +/// (0x1002 and 0x1004) or with an 8-byte watchpoint at 0x1000. +/// A 4-byte watchpoint at 0x1002 would not be properly 4 byte aligned. +/// +/// If a user asks to watch 16 bytes at 0x1000, and this target supports +/// 8-byte watchpoints, we can implement this with two 8-byte watchpoints +/// at 0x1000 and 0x1008. + ---------------- JDevlieghere wrote:
Spurious newline. https://github.com/llvm/llvm-project/pull/79962 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
