c2548a8c4c
Add support for DW_OP_WASM_location in DWARFExpression. This PR rebases #78977 and cleans up the unit test. The DWARF extensions are documented at https://yurydelendik.github.io/webassembly-dwarf/ and supported by LLVM-based toolchains such as Clang, Swift, Emscripten, and Rust.
101 lines
3.1 KiB
C++
101 lines
3.1 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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#include "SymbolFileWasm.h"
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#include "Plugins/SymbolFile/DWARF/LogChannelDWARF.h"
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#include "Utility/WasmVirtualRegisters.h"
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#include "lldb/Utility/LLDBLog.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::plugin::dwarf;
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SymbolFileWasm::SymbolFileWasm(ObjectFileSP objfile_sp,
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SectionList *dwo_section_list)
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: SymbolFileDWARF(objfile_sp, dwo_section_list) {}
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SymbolFileWasm::~SymbolFileWasm() = default;
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lldb::offset_t
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SymbolFileWasm::GetVendorDWARFOpcodeSize(const DataExtractor &data,
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const lldb::offset_t data_offset,
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const uint8_t op) const {
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if (op != llvm::dwarf::DW_OP_WASM_location)
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return LLDB_INVALID_OFFSET;
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lldb::offset_t offset = data_offset;
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const uint8_t wasm_op = data.GetU8(&offset);
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switch (wasm_op) {
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case 0: // LOCAL
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case 1: // GLOBAL_FIXED
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case 2: // OPERAND_STACK
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data.GetULEB128(&offset);
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break;
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case 3: // GLOBAL_RELOC
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data.GetU32(&offset);
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break;
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default:
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return LLDB_INVALID_OFFSET;
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}
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return offset - data_offset;
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}
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bool SymbolFileWasm::ParseVendorDWARFOpcode(uint8_t op,
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const DataExtractor &opcodes,
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lldb::offset_t &offset,
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RegisterContext *reg_ctx,
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lldb::RegisterKind reg_kind,
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std::vector<Value> &stack) const {
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if (op != llvm::dwarf::DW_OP_WASM_location)
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return false;
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uint32_t index = 0;
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uint8_t tag = eWasmTagNotAWasmLocation;
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/// |DWARF Location Index | WebAssembly Construct |
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/// |---------------------|-----------------------|
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/// |0 | Local |
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/// |1 or 3 | Global |
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/// |2 | Operand Stack |
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const uint8_t wasm_op = opcodes.GetU8(&offset);
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switch (wasm_op) {
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case 0: // LOCAL
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index = opcodes.GetULEB128(&offset);
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tag = eWasmTagLocal;
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break;
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case 1: // GLOBAL_FIXED
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index = opcodes.GetULEB128(&offset);
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tag = eWasmTagGlobal;
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break;
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case 2: // OPERAND_STACK
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index = opcodes.GetULEB128(&offset);
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tag = eWasmTagOperandStack;
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break;
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case 3: // GLOBAL_RELOC
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index = opcodes.GetU32(&offset);
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tag = eWasmTagGlobal;
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break;
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default:
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return false;
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}
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const uint32_t reg_num = GetWasmRegister(tag, index);
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Value tmp;
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llvm::Error error = DWARFExpression::ReadRegisterValueAsScalar(
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reg_ctx, reg_kind, reg_num, tmp);
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if (error) {
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LLDB_LOG_ERROR(GetLog(DWARFLog::DebugInfo), std::move(error), "{0}");
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return false;
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}
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stack.push_back(tmp);
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return true;
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}
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