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//===-- DumpRegisterValue.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/Core/DumpRegisterValue.h"
#include "lldb/Core/DumpDataExtractor.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/DataFormatters/DumpValueObjectOptions.h"
#include "lldb/Target/RegisterFlags.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/lldb-private-types.h"
#include "llvm/ADT/bit.h"
using namespace lldb;
template <typename T>
static void dump_type_value(lldb_private::CompilerType &fields_type, T value,
lldb_private::ExecutionContextScope *exe_scope,
const lldb_private::RegisterInfo ®_info,
lldb_private::Stream &strm) {
lldb::ByteOrder target_order = exe_scope->CalculateProcess()->GetByteOrder();
// For the bitfield types we generate, it is expected that the fields are
// in what is usually a big endian order. Most significant field first.
// This is also clang's internal ordering and the order we want to print
// them. On a big endian host this all matches up, for a little endian
// host we have to swap the order of the fields before display.
if (target_order == lldb::ByteOrder::eByteOrderLittle) {
value = reg_info.flags_type->ReverseFieldOrder(value);
}
// Then we need to match the target's endian on a byte level as well.
if (lldb_private::endian::InlHostByteOrder() != target_order)
value = llvm::byteswap(value);
lldb_private::DataExtractor data_extractor{
&value, sizeof(T), lldb_private::endian::InlHostByteOrder(), 8};
lldb::ValueObjectSP vobj_sp = lldb_private::ValueObjectConstResult::Create(
exe_scope, fields_type, lldb_private::ConstString(), data_extractor);
lldb_private::DumpValueObjectOptions dump_options;
lldb_private::DumpValueObjectOptions::ChildPrintingDecider decider =
[](lldb_private::ConstString varname) {
// Unnamed bit-fields are padding that we don't want to show.
return varname.GetLength();
};
dump_options.SetChildPrintingDecider(decider).SetHideRootType(true);
if (llvm::Error error = vobj_sp->Dump(strm, dump_options))
strm << "error: " << toString(std::move(error));
}
void lldb_private::DumpRegisterValue(const RegisterValue ®_val, Stream &s,
const RegisterInfo ®_info,
bool prefix_with_name,
bool prefix_with_alt_name, Format format,
uint32_t reg_name_right_align_at,
ExecutionContextScope *exe_scope,
bool print_flags, TargetSP target_sp) {
DataExtractor data;
if (!reg_val.GetData(data))
return;
bool name_printed = false;
// For simplicity, alignment of the register name printing applies only in
// the most common case where:
//
// prefix_with_name^prefix_with_alt_name is true
//
StreamString format_string;
if (reg_name_right_align_at && (prefix_with_name ^ prefix_with_alt_name))
format_string.Printf("%%%us", reg_name_right_align_at);
else
format_string.Printf("%%s");
std::string fmt = std::string(format_string.GetString());
if (prefix_with_name) {
if (reg_info.name) {
s.Printf(fmt.c_str(), reg_info.name);
name_printed = true;
} else if (reg_info.alt_name) {
s.Printf(fmt.c_str(), reg_info.alt_name);
prefix_with_alt_name = false;
name_printed = true;
}
}
if (prefix_with_alt_name) {
if (name_printed)
s.PutChar('/');
if (reg_info.alt_name) {
s.Printf(fmt.c_str(), reg_info.alt_name);
name_printed = true;
} else if (!name_printed) {
// No alternate name but we were asked to display a name, so show the
// main name
s.Printf(fmt.c_str(), reg_info.name);
name_printed = true;
}
}
if (name_printed)
s.PutCString(" = ");
if (format == eFormatDefault)
format = reg_info.format;
DumpDataExtractor(data, &s,
0, // Offset in "data"
format, // Format to use when dumping
reg_info.byte_size, // item_byte_size
1, // item_count
UINT32_MAX, // num_per_line
LLDB_INVALID_ADDRESS, // base_addr
0, // item_bit_size
0, // item_bit_offset
exe_scope);
if (!print_flags || !reg_info.flags_type || !exe_scope || !target_sp ||
(reg_info.byte_size != 4 && reg_info.byte_size != 8))
return;
CompilerType fields_type = target_sp->GetRegisterType(
reg_info.name, *reg_info.flags_type, reg_info.byte_size);
// Use a new stream so we can remove a trailing newline later.
StreamString fields_stream;
if (reg_info.byte_size == 4) {
dump_type_value(fields_type, reg_val.GetAsUInt32(), exe_scope, reg_info,
fields_stream);
} else {
dump_type_value(fields_type, reg_val.GetAsUInt64(), exe_scope, reg_info,
fields_stream);
}
// Registers are indented like:
// (lldb) register read foo
// foo = 0x12345678
// So we need to indent to match that.
// First drop the extra newline that the value printer added. The register
// command will add one itself.
llvm::StringRef fields_str = fields_stream.GetString().drop_back();
// End the line that contains " foo = 0x12345678".
s.EOL();
// Then split the value lines and indent each one.
bool first = true;
while (fields_str.size()) {
std::pair<llvm::StringRef, llvm::StringRef> split = fields_str.split('\n');
fields_str = split.second;
// Indent as far as the register name did.
s.Printf(fmt.c_str(), "");
// Lines after the first won't have " = " so compensate for that.
if (!first)
s << " ";
first = false;
s << split.first;
// On the last line we don't want a newline because the command will add
// one too.
if (fields_str.size())
s.EOL();
}
}
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