f62370290a
This PR implements a register context for Wasm, which uses virtual registers to resolve Wasm local, globals and stack values. The registers are used to implement support for `DW_OP_WASM_location` in the DWARF expression evaluator (#151010). This also adds a more comprehensive test, showing that we can use this to show local variables.
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
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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#ifndef LLDB_SOURCE_PLUGINS_PROCESS_WASM_PROCESSWASM_H
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#define LLDB_SOURCE_PLUGINS_PROCESS_WASM_PROCESSWASM_H
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#include "Plugins/Process/gdb-remote/ProcessGDBRemote.h"
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#include "Utility/WasmVirtualRegisters.h"
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namespace lldb_private {
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namespace wasm {
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/// Each WebAssembly module has separated address spaces for Code and Memory.
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/// A WebAssembly module also has a Data section which, when the module is
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/// loaded, gets mapped into a region in the module Memory.
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enum WasmAddressType : uint8_t { Memory = 0x00, Object = 0x01, Invalid = 0xff };
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/// For the purpose of debugging, we can represent all these separated 32-bit
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/// address spaces with a single virtual 64-bit address space. The
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/// wasm_addr_t provides this encoding using bitfields.
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struct wasm_addr_t {
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uint64_t offset : 32;
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uint64_t module_id : 30;
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uint64_t type : 2;
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wasm_addr_t(lldb::addr_t addr)
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: offset(addr & 0x00000000ffffffff),
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module_id((addr & 0x00ffffff00000000) >> 32), type(addr >> 62) {}
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wasm_addr_t(WasmAddressType type, uint32_t module_id, uint32_t offset)
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: offset(offset), module_id(module_id), type(type) {}
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WasmAddressType GetType() { return static_cast<WasmAddressType>(type); }
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operator lldb::addr_t() { return *(uint64_t *)this; }
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};
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static_assert(sizeof(wasm_addr_t) == 8, "");
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/// ProcessWasm provides the access to the Wasm program state
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/// retrieved from the Wasm engine.
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class ProcessWasm : public process_gdb_remote::ProcessGDBRemote {
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public:
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ProcessWasm(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp);
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~ProcessWasm() override = default;
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static lldb::ProcessSP CreateInstance(lldb::TargetSP target_sp,
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lldb::ListenerSP listener_sp,
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const FileSpec *crash_file_path,
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bool can_connect);
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static void Initialize();
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static void DebuggerInitialize(Debugger &debugger);
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static void Terminate();
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static llvm::StringRef GetPluginNameStatic();
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static llvm::StringRef GetPluginDescriptionStatic();
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llvm::StringRef GetPluginName() override;
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size_t ReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
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Status &error) override;
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bool CanDebug(lldb::TargetSP target_sp,
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bool plugin_specified_by_name) override;
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/// Retrieve the current call stack from the WebAssembly remote process.
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llvm::Expected<std::vector<lldb::addr_t>> GetWasmCallStack(lldb::tid_t tid);
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/// Query the value of a WebAssembly variable from the WebAssembly
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/// remote process.
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llvm::Expected<lldb::DataBufferSP>
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GetWasmVariable(WasmVirtualRegisterKinds kind, int frame_index, int index);
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protected:
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std::shared_ptr<process_gdb_remote::ThreadGDBRemote>
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CreateThread(lldb::tid_t tid) override;
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private:
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friend class UnwindWasm;
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friend class ThreadWasm;
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process_gdb_remote::GDBRemoteDynamicRegisterInfoSP &GetRegisterInfo() {
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return m_register_info_sp;
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}
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ProcessWasm(const ProcessWasm &);
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const ProcessWasm &operator=(const ProcessWasm &) = delete;
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};
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} // namespace wasm
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} // namespace lldb_private
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#endif
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