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| author | Greg Clayton <gclayton@apple.com> | 2014-02-12 23:16:19 +0000 |
|---|---|---|
| committer | Greg Clayton <gclayton@apple.com> | 2014-02-12 23:16:19 +0000 |
| commit | 7a1bd0baa17a80eedfcc8b0cdf9192ab1aac077b (patch) | |
| tree | 0a87bfb520f516309ce8012870c6b790b24ac144 | |
| parent | 3c7e961b29ce95d86207bf7cfe42814569fe4325 (diff) | |
| download | bcm5719-llvm-7a1bd0baa17a80eedfcc8b0cdf9192ab1aac077b.tar.gz bcm5719-llvm-7a1bd0baa17a80eedfcc8b0cdf9192ab1aac077b.zip | |
Add support for DW_OP_piece and DW_OP_bit_piece.
llvm-svn: 201268
| -rw-r--r-- | lldb/source/Expression/DWARFExpression.cpp | 87 |
1 files changed, 84 insertions, 3 deletions
diff --git a/lldb/source/Expression/DWARFExpression.cpp b/lldb/source/Expression/DWARFExpression.cpp index e8ed9c5cb58..28aa6d02a56 100644 --- a/lldb/source/Expression/DWARFExpression.cpp +++ b/lldb/source/Expression/DWARFExpression.cpp @@ -2574,9 +2574,90 @@ DWARFExpression::Evaluate // variable a particular DWARF expression refers to. //---------------------------------------------------------------------- case DW_OP_piece: - if (error_ptr) - error_ptr->SetErrorString ("Unimplemented opcode DW_OP_piece."); - return false; + if (stack.size() < 1) + { + if (error_ptr) + error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_piece."); + return false; + } + else + { + const uint64_t piece_byte_size = opcodes.GetULEB128(&offset); + switch (stack.back().GetValueType()) + { + case Value::eValueTypeScalar: + case Value::eValueTypeFileAddress: + case Value::eValueTypeLoadAddress: + case Value::eValueTypeHostAddress: + { + uint32_t bit_size = piece_byte_size * 8; + uint32_t bit_offset = 0; + if (!stack.back().GetScalar().ExtractBitfield (bit_size, bit_offset)) + { + if (error_ptr) + error_ptr->SetErrorStringWithFormat("unable to extract %" PRIu64 " bytes from a %" PRIu64 " byte scalar value.", piece_byte_size, (uint64_t)stack.back().GetScalar().GetByteSize()); + return false; + } + } + break; + + case Value::eValueTypeVector: + { + if (stack.back().GetVector().length >= piece_byte_size) + stack.back().GetVector().length = piece_byte_size; + else + { + if (error_ptr) + error_ptr->SetErrorStringWithFormat("unable to extract %" PRIu64 " bytes from a %" PRIu64 " byte vector value.", piece_byte_size, (uint64_t)stack.back().GetVector().length); + return false; + } + } + break; + } + } + break; + + case DW_OP_bit_piece: // 0x9d ULEB128 bit size, ULEB128 bit offset (DWARF3); + if (stack.size() < 1) + { + if (error_ptr) + error_ptr->SetErrorString("Expression stack needs at least 1 item for DW_OP_bit_piece."); + return false; + } + else + { + const uint64_t piece_bit_size = opcodes.GetULEB128(&offset); + const uint64_t piece_bit_offset = opcodes.GetULEB128(&offset); + switch (stack.back().GetValueType()) + { + case Value::eValueTypeScalar: + case Value::eValueTypeFileAddress: + case Value::eValueTypeLoadAddress: + case Value::eValueTypeHostAddress: + { + if (!stack.back().GetScalar().ExtractBitfield (piece_bit_size, piece_bit_offset)) + { + if (error_ptr) + error_ptr->SetErrorStringWithFormat("unable to extract %" PRIu64 " bit value with %" PRIu64 " bit offset from a %" PRIu64 " bit scalar value.", + piece_bit_size, + piece_bit_offset, + (uint64_t)(stack.back().GetScalar().GetByteSize()*8)); + return false; + } + } + break; + + case Value::eValueTypeVector: + if (error_ptr) + { + error_ptr->SetErrorStringWithFormat ("unable to extract %" PRIu64 " bit value with %" PRIu64 " bit offset from a vector value.", + piece_bit_size, + piece_bit_offset); + } + return false; + } + } + break; //---------------------------------------------------------------------- // OPCODE: DW_OP_push_object_address |
