eca07c592a
Clang recently improved its DWARF support for C VLA types. The DWARF
now looks like this:
0x00000051: DW_TAG_variable [4]
DW_AT_location( fbreg -32 )
DW_AT_name( "__vla_expr" )
DW_AT_type( {0x000000d3} ( long unsigned int ) )
DW_AT_artificial( true )
...
0x000000da: DW_TAG_array_type [10] *
DW_AT_type( {0x000000cc} ( int ) )
0x000000df: DW_TAG_subrange_type [11]
DW_AT_type( {0x000000e9} ( __ARRAY_SIZE_TYPE__ ) )
DW_AT_count( {0x00000051} )
Without this patch LLDB will naively interpret the DIE offset 0x51 as
the static size of the array, which is clearly wrong. This patch
extends ValueObject::GetNumChildren to query the dynamic properties of
incomplete array types.
See the testcase for an example:
4 int foo(int a) {
5 int vla[a];
6 for (int i = 0; i < a; ++i)
7 vla[i] = i;
8
-> 9 pause(); // break here
10 return vla[a-1];
11 }
(lldb) fr v vla
(int []) vla = ([0] = 0, [1] = 1, [2] = 2, [3] = 3)
(lldb) quit
rdar://problem/21814005
Differential Revision: https://reviews.llvm.org/D53530
llvm-svn: 346165
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
//===-- DWARFASTParser.h ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SymbolFileDWARF_DWARFASTParser_h_
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#define SymbolFileDWARF_DWARFASTParser_h_
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#include "DWARFDefines.h"
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#include "lldb/Core/PluginInterface.h"
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#include "lldb/Symbol/SymbolFile.h"
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#include "lldb/Symbol/CompilerDecl.h"
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#include "lldb/Symbol/CompilerDeclContext.h"
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class DWARFDIE;
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namespace lldb_private {
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class ExecutionContext;
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}
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class SymbolFileDWARF;
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class DWARFASTParser {
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public:
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virtual ~DWARFASTParser() {}
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virtual lldb::TypeSP ParseTypeFromDWARF(const lldb_private::SymbolContext &sc,
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const DWARFDIE &die,
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lldb_private::Log *log,
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bool *type_is_new_ptr) = 0;
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virtual lldb_private::Function *
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ParseFunctionFromDWARF(const lldb_private::SymbolContext &sc,
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const DWARFDIE &die) = 0;
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virtual bool
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CompleteTypeFromDWARF(const DWARFDIE &die, lldb_private::Type *type,
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lldb_private::CompilerType &compiler_type) = 0;
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virtual lldb_private::CompilerDecl
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GetDeclForUIDFromDWARF(const DWARFDIE &die) = 0;
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virtual lldb_private::CompilerDeclContext
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GetDeclContextForUIDFromDWARF(const DWARFDIE &die) = 0;
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virtual lldb_private::CompilerDeclContext
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GetDeclContextContainingUIDFromDWARF(const DWARFDIE &die) = 0;
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virtual std::vector<DWARFDIE>
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GetDIEForDeclContext(lldb_private::CompilerDeclContext decl_context) = 0;
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static llvm::Optional<lldb_private::SymbolFile::ArrayInfo>
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ParseChildArrayInfo(const DWARFDIE &parent_die,
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const lldb_private::ExecutionContext *exe_ctx = nullptr);
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};
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#endif // SymbolFileDWARF_DWARFASTParser_h_
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