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https://github.com/intel/llvm.git
synced 2026-01-16 13:35:38 +08:00
JITed functions can now have debug info and be debugged with debug and source info:
(lldb) b puts
(lldb) expr -g -i0 -- (int)puts("hello")
First we will stop at the entry point of the expression before it runs, then we can step over a few times and hit the breakpoint in "puts", then we can continue and finishing stepping and fininsh the expression.
Main features:
- New ObjectFileJIT class that can be easily created for JIT functions
- debug info can now be enabled when parsing expressions
- source for any function that is run throught the JIT is now saved in LLDB process specific temp directory and cleaned up on exit
- "expr -g --" allows you to single step through your expression function with source code
<rdar://problem/16382881>
llvm-svn: 204682
This commit is contained in:
Greg Clayton
364
lldb/source/Plugins/ObjectFile/JIT/ObjectFileJIT.cpp
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364
lldb/source/Plugins/ObjectFile/JIT/ObjectFileJIT.cpp
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//===-- ObjectFileJIT.cpp ---------------------------------------*- 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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#include "llvm/ADT/StringRef.h"
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#include "ObjectFileJIT.h"
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#include "lldb/lldb-private-log.h"
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#include "lldb/Core/ArchSpec.h"
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#include "lldb/Core/DataBuffer.h"
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#include "lldb/Core/DataBufferHeap.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/FileSpecList.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleSpec.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/RangeMap.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Core/StreamString.h"
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#include "lldb/Core/Timer.h"
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#include "lldb/Core/UUID.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Host/FileSpec.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Target/Platform.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/SectionLoadList.h"
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#include "lldb/Target/Target.h"
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#ifndef __APPLE__
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#include "Utility/UuidCompatibility.h"
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#endif
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using namespace lldb;
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using namespace lldb_private;
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void
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ObjectFileJIT::Initialize()
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{
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PluginManager::RegisterPlugin (GetPluginNameStatic(),
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GetPluginDescriptionStatic(),
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CreateInstance,
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CreateMemoryInstance,
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GetModuleSpecifications);
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}
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void
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ObjectFileJIT::Terminate()
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{
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PluginManager::UnregisterPlugin (CreateInstance);
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}
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lldb_private::ConstString
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ObjectFileJIT::GetPluginNameStatic()
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{
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static ConstString g_name("jit");
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return g_name;
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}
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const char *
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ObjectFileJIT::GetPluginDescriptionStatic()
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{
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return "JIT code object file";
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}
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ObjectFile *
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ObjectFileJIT::CreateInstance (const lldb::ModuleSP &module_sp,
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DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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const FileSpec* file,
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lldb::offset_t file_offset,
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lldb::offset_t length)
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{
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// JIT'ed object file is backed by the ObjectFileJITDelegate, never
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// read from a file
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return NULL;
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}
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ObjectFile *
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ObjectFileJIT::CreateMemoryInstance (const lldb::ModuleSP &module_sp,
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DataBufferSP& data_sp,
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const ProcessSP &process_sp,
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lldb::addr_t header_addr)
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{
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// JIT'ed object file is backed by the ObjectFileJITDelegate, never
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// read from memory
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return NULL;
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}
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size_t
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ObjectFileJIT::GetModuleSpecifications (const lldb_private::FileSpec& file,
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lldb::DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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lldb::offset_t file_offset,
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lldb::offset_t length,
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lldb_private::ModuleSpecList &specs)
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{
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// JIT'ed object file can't be read from a file on disk
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return 0;
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}
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ObjectFileJIT::ObjectFileJIT (const lldb::ModuleSP &module_sp,
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const ObjectFileJITDelegateSP &delegate_sp) :
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ObjectFile(module_sp, NULL, 0, 0, DataBufferSP(), 0),
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m_delegate_wp ()
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{
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if (delegate_sp)
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{
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m_delegate_wp = delegate_sp;
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m_data.SetByteOrder(delegate_sp->GetByteOrder());
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m_data.SetAddressByteSize(delegate_sp->GetAddressByteSize());
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}
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}
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ObjectFileJIT::~ObjectFileJIT()
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{
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}
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bool
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ObjectFileJIT::ParseHeader ()
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{
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// JIT code is never in a file, nor is it required to have any header
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return false;
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}
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ByteOrder
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ObjectFileJIT::GetByteOrder () const
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{
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return m_data.GetByteOrder();
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}
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bool
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ObjectFileJIT::IsExecutable() const
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{
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return false;
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}
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uint32_t
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ObjectFileJIT::GetAddressByteSize () const
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{
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return m_data.GetAddressByteSize();
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}
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Symtab *
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ObjectFileJIT::GetSymtab()
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{
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ModuleSP module_sp(GetModule());
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if (module_sp)
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{
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lldb_private::Mutex::Locker locker(module_sp->GetMutex());
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if (m_symtab_ap.get() == NULL)
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{
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m_symtab_ap.reset(new Symtab(this));
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Mutex::Locker symtab_locker (m_symtab_ap->GetMutex());
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ObjectFileJITDelegateSP delegate_sp (m_delegate_wp.lock());
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if (delegate_sp)
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delegate_sp->PopulateSymtab(this, *m_symtab_ap);
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// TODO: get symbols from delegate
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m_symtab_ap->Finalize ();
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}
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}
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return m_symtab_ap.get();
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}
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bool
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ObjectFileJIT::IsStripped ()
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{
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return false; // JIT code that is in a module is never stripped
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}
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void
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ObjectFileJIT::CreateSections (SectionList &unified_section_list)
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{
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if (!m_sections_ap.get())
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{
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m_sections_ap.reset(new SectionList());
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ObjectFileJITDelegateSP delegate_sp (m_delegate_wp.lock());
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if (delegate_sp)
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{
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delegate_sp->PopulateSectionList(this, *m_sections_ap);
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unified_section_list = *m_sections_ap;
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}
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}
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}
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void
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ObjectFileJIT::Dump (Stream *s)
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{
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ModuleSP module_sp(GetModule());
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if (module_sp)
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{
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lldb_private::Mutex::Locker locker(module_sp->GetMutex());
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s->Printf("%p: ", this);
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s->Indent();
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s->PutCString("ObjectFileJIT");
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ArchSpec arch;
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if (GetArchitecture(arch))
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*s << ", arch = " << arch.GetArchitectureName();
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s->EOL();
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SectionList *sections = GetSectionList();
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if (sections)
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sections->Dump(s, NULL, true, UINT32_MAX);
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if (m_symtab_ap.get())
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m_symtab_ap->Dump(s, NULL, eSortOrderNone);
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}
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}
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bool
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ObjectFileJIT::GetUUID (lldb_private::UUID* uuid)
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{
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// TODO: maybe get from delegate, not needed for first pass
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return false;
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}
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uint32_t
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ObjectFileJIT::GetDependentModules (FileSpecList& files)
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{
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// JIT modules don't have dependencies, but they could
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// if external functions are called and we know where they are
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files.Clear();
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return 0;
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}
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lldb_private::Address
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ObjectFileJIT::GetEntryPointAddress ()
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{
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return Address();
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}
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lldb_private::Address
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ObjectFileJIT::GetHeaderAddress ()
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{
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return Address();
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}
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ObjectFile::Type
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ObjectFileJIT::CalculateType()
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{
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return eTypeJIT;
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}
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ObjectFile::Strata
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ObjectFileJIT::CalculateStrata()
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{
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return eStrataJIT;
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}
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bool
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ObjectFileJIT::GetArchitecture (ArchSpec &arch)
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{
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ObjectFileJITDelegateSP delegate_sp (m_delegate_wp.lock());
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if (delegate_sp)
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return delegate_sp->GetArchitecture(arch);
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return false;
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}
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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lldb_private::ConstString
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ObjectFileJIT::GetPluginName()
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{
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return GetPluginNameStatic();
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}
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uint32_t
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ObjectFileJIT::GetPluginVersion()
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{
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return 1;
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}
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bool
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ObjectFileJIT::SetLoadAddress (Target &target,
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lldb::addr_t value,
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bool value_is_offset)
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{
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bool changed = false;
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size_t num_loaded_sections = 0;
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SectionList *section_list = GetSectionList ();
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if (section_list)
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{
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const size_t num_sections = section_list->GetSize();
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// "value" is an offset to apply to each top level segment
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for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx)
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{
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// Iterate through the object file sections to find all
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// of the sections that size on disk (to avoid __PAGEZERO)
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// and load them
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SectionSP section_sp (section_list->GetSectionAtIndex (sect_idx));
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if (section_sp &&
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section_sp->GetFileSize() > 0 &&
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section_sp->IsThreadSpecific() == false)
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{
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if (target.GetSectionLoadList().SetSectionLoadAddress (section_sp, section_sp->GetFileAddress() + value))
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++num_loaded_sections;
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}
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}
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}
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changed = num_loaded_sections > 0;
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return num_loaded_sections > 0;
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}
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size_t
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ObjectFileJIT::ReadSectionData (const lldb_private::Section *section,
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off_t section_offset,
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void *dst,
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size_t dst_len) const
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{
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lldb::offset_t file_size = section->GetFileSize();
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if (section_offset < file_size)
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{
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uint64_t src_len = file_size - section_offset;
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if (src_len > dst_len)
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src_len = dst_len;
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const uint8_t *src = ((uint8_t *)(uintptr_t)section->GetFileOffset()) + section_offset;
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memcpy (dst, src, src_len);
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return src_len;
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}
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return 0;
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}
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size_t
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ObjectFileJIT::ReadSectionData (const lldb_private::Section *section,
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lldb_private::DataExtractor& section_data) const
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{
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if (section->GetFileSize())
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{
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const void *src = (void *)(uintptr_t)section->GetFileOffset();
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DataBufferSP data_sp (new lldb_private::DataBufferHeap(src, section->GetFileSize()));
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if (data_sp)
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{
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section_data.SetData (data_sp, 0, data_sp->GetByteSize());
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section_data.SetByteOrder (GetByteOrder());
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section_data.SetAddressByteSize (GetAddressByteSize());
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return section_data.GetByteSize();
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}
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}
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section_data.Clear();
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return 0;
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}
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