71d778f33e
Before, NativePDB uses scoped range as a workaround for value range, that causes problems (e.g. a variable's value can only have one range, but usually a variable's value is located at different address ranges, each at different locations, in optimized build). This patch let NativePDB switch to DWARFLocationList so a variable's value can be described at multiple non-overlapped address ranges and each range maps to a location. Because overlapping ranges exists, here's peference when choosing ranges: 1. Always prefer whole value locations. Suppose a variable size is 8 bytes, one record is that for range [1, 5) first 4 bytes is at ecx, and another record is that for range [2, 8) the 8 bytes value is at rdx. This results: [1, 2) has first 4 bytes at ecx, [2, 8) has the whole value at rdx. 2. Always prefer the locations parsed later. Suppose first record is that for range [1, 5) value is at ecx, second record is that for range [2, 6) value is at eax. This results: [1, 2) -> ecx, [2, 6) -> eax. Differential Revision: https://reviews.llvm.org/D130796
58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
//===-- DWARFLocationExpression.h -------------------------------*- 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_SYMBOLFILE_NATIVEPDB_DWARFLOCATIONEXPRESSION_H
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#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_NATIVEPDB_DWARFLOCATIONEXPRESSION_H
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#include "lldb/lldb-forward.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include <map>
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namespace llvm {
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class APSInt;
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class StringRef;
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namespace codeview {
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class TypeIndex;
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}
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namespace pdb {
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class TpiStream;
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}
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} // namespace llvm
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namespace lldb_private {
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namespace npdb {
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struct MemberValLocation {
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uint16_t reg_id;
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uint16_t reg_offset;
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bool is_at_reg = true;
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};
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DWARFExpression
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MakeEnregisteredLocationExpression(llvm::codeview::RegisterId reg,
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lldb::ModuleSP module);
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DWARFExpression MakeRegRelLocationExpression(llvm::codeview::RegisterId reg,
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int32_t offset,
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lldb::ModuleSP module);
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DWARFExpression MakeVFrameRelLocationExpression(llvm::StringRef fpo_program,
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int32_t offset,
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lldb::ModuleSP module);
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DWARFExpression MakeGlobalLocationExpression(uint16_t section, uint32_t offset,
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lldb::ModuleSP module);
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DWARFExpression MakeConstantLocationExpression(
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llvm::codeview::TypeIndex underlying_ti, llvm::pdb::TpiStream &tpi,
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const llvm::APSInt &constant, lldb::ModuleSP module);
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DWARFExpression MakeEnregisteredLocationExpressionForComposite(
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const std::map<uint64_t, MemberValLocation> &offset_to_location,
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std::map<uint64_t, size_t> &offset_to_size, size_t total_size,
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lldb::ModuleSP module);
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} // namespace npdb
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} // namespace lldb_private
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#endif
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