llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-lldb Author: Paolo Severini (paolosevMSFT) <details> <summary>Changes</summary> Add support for `DW_OP_WASM_location` in `DWARFExpression`. --- Full diff: https://github.com/llvm/llvm-project/pull/78977.diff 1 Files Affected: - (modified) lldb/source/Expression/DWARFExpression.cpp (+41) ``````````diff diff --git a/lldb/source/Expression/DWARFExpression.cpp b/lldb/source/Expression/DWARFExpression.cpp index fe4928d4f43a434..95033db5ed8f5a1 100644 --- a/lldb/source/Expression/DWARFExpression.cpp +++ b/lldb/source/Expression/DWARFExpression.cpp @@ -346,6 +346,16 @@ static offset_t GetOpcodeDataSize(const DataExtractor &data, return (offset - data_offset) + subexpr_len; } + case DW_OP_WASM_location: { + uint8_t wasm_op = data.GetU8(&offset); + if (wasm_op == 3) { + data.GetU32(&offset); + } else { + data.GetULEB128(&offset); + } + return offset - data_offset; + } + default: if (!dwarf_cu) { return LLDB_INVALID_OFFSET; @@ -2595,6 +2605,37 @@ bool DWARFExpression::Evaluate( break; } + case DW_OP_WASM_location: { + uint8_t wasm_op = opcodes.GetU8(&offset); + uint32_t index; + + /* LLDB doesn't have an address space to represents WebAssembly locals, + * globals and operand stacks. + * We encode these elements into virtual registers: + * | tag: 2 bits | index: 30 bits | + * where tag is: + * 0: Not a WebAssembly location + * 1: Local + * 2: Global + * 3: Operand stack value + */ + if (wasm_op == 3) { + index = opcodes.GetU32(&offset); + wasm_op = 2; // Global + } else { + index = opcodes.GetULEB128(&offset); + } + + reg_num = (((wasm_op + 1) & 0x03) << 30) | (index & 0x3fffffff); + + if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp)) + stack.push_back(tmp); + else + return false; + + break; + } + default: if (dwarf_cu) { if (dwarf_cu->GetSymbolFileDWARF().ParseVendorDWARFOpcode( `````````` </details> https://github.com/llvm/llvm-project/pull/78977 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
