8d94ba0fb1
Turns out that most of the code that runs expressions (e.g. the ObjC runtime grubber) on behalf of the expression parser was using the currently selected thread. But sometimes, e.g. when we are evaluating breakpoint conditions/commands, we don't select the thread we're running on, we instead set the context for the interpreter, and explicitly pass that to other callers. That wasn't getting communicated to these utility expressions, so they would run on some other thread instead, and that could cause a variety of subtle and hard to reproduce problems. I also went through the commands and cleaned up the use of GetSelectedThread. All those uses should have been trying the thread in the m_exe_ctx belonging to the command object first. It would actually have been pretty hard to get misbehavior in these cases, but for correctness sake it is good to make this usage consistent. <rdar://problem/24978569> llvm-svn: 263326
276 lines
11 KiB
C++
276 lines
11 KiB
C++
//===-- InferiorCallPOSIX.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 "InferiorCallPOSIX.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Target/ExecutionContext.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/Target.h"
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#include "lldb/Target/ThreadPlanCallFunction.h"
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#include "lldb/Host/Config.h"
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#ifndef LLDB_DISABLE_POSIX
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#include <sys/mman.h>
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#else
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// define them
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#define PROT_NONE 0
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#define PROT_READ 1
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#define PROT_WRITE 2
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#define PROT_EXEC 4
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#endif
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using namespace lldb;
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using namespace lldb_private;
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bool
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lldb_private::InferiorCallMmap (Process *process,
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addr_t &allocated_addr,
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addr_t addr,
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addr_t length,
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unsigned prot,
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unsigned flags,
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addr_t fd,
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addr_t offset)
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{
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Thread *thread = process->GetThreadList().GetExpressionExecutionThread().get();
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if (thread == NULL)
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return false;
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const bool append = true;
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const bool include_symbols = true;
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const bool include_inlines = false;
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SymbolContextList sc_list;
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const uint32_t count
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= process->GetTarget().GetImages().FindFunctions (ConstString ("mmap"),
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eFunctionNameTypeFull,
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include_symbols,
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include_inlines,
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append,
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sc_list);
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if (count > 0)
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{
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SymbolContext sc;
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if (sc_list.GetContextAtIndex(0, sc))
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{
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const uint32_t range_scope = eSymbolContextFunction | eSymbolContextSymbol;
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const bool use_inline_block_range = false;
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EvaluateExpressionOptions options;
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options.SetStopOthers(true);
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options.SetUnwindOnError(true);
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options.SetIgnoreBreakpoints(true);
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options.SetTryAllThreads(true);
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options.SetDebug (false);
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options.SetTimeoutUsec(500000);
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options.SetTrapExceptions(false);
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addr_t prot_arg, flags_arg = 0;
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if (prot == eMmapProtNone)
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prot_arg = PROT_NONE;
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else {
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prot_arg = 0;
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if (prot & eMmapProtExec)
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prot_arg |= PROT_EXEC;
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if (prot & eMmapProtRead)
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prot_arg |= PROT_READ;
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if (prot & eMmapProtWrite)
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prot_arg |= PROT_WRITE;
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}
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const ArchSpec arch = process->GetTarget().GetArchitecture();
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flags_arg = process->GetTarget().GetPlatform()->ConvertMmapFlagsToPlatform(arch,flags);
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AddressRange mmap_range;
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if (sc.GetAddressRange(range_scope, 0, use_inline_block_range, mmap_range))
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{
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ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext();
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CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
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lldb::addr_t args[] = { addr, length, prot_arg, flags_arg, fd, offset };
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lldb::ThreadPlanSP call_plan_sp (new ThreadPlanCallFunction (*thread,
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mmap_range.GetBaseAddress(),
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clang_void_ptr_type,
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args,
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options));
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if (call_plan_sp)
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{
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StreamFile error_strm;
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StackFrame *frame = thread->GetStackFrameAtIndex (0).get();
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if (frame)
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{
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ExecutionContext exe_ctx;
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frame->CalculateExecutionContext (exe_ctx);
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ExpressionResults result = process->RunThreadPlan (exe_ctx,
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call_plan_sp,
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options,
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error_strm);
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if (result == eExpressionCompleted)
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{
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allocated_addr = call_plan_sp->GetReturnValueObject()->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
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if (process->GetAddressByteSize() == 4)
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{
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if (allocated_addr == UINT32_MAX)
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return false;
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}
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else if (process->GetAddressByteSize() == 8)
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{
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if (allocated_addr == UINT64_MAX)
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return false;
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}
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return true;
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}
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}
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}
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}
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}
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}
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return false;
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}
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bool
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lldb_private::InferiorCallMunmap (Process *process,
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addr_t addr,
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addr_t length)
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{
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Thread *thread = process->GetThreadList().GetExpressionExecutionThread().get();
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if (thread == NULL)
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return false;
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const bool append = true;
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const bool include_symbols = true;
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const bool include_inlines = false;
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SymbolContextList sc_list;
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const uint32_t count
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= process->GetTarget().GetImages().FindFunctions (ConstString ("munmap"),
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eFunctionNameTypeFull,
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include_symbols,
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include_inlines,
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append,
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sc_list);
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if (count > 0)
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{
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SymbolContext sc;
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if (sc_list.GetContextAtIndex(0, sc))
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{
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const uint32_t range_scope = eSymbolContextFunction | eSymbolContextSymbol;
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const bool use_inline_block_range = false;
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EvaluateExpressionOptions options;
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options.SetStopOthers(true);
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options.SetUnwindOnError(true);
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options.SetIgnoreBreakpoints(true);
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options.SetTryAllThreads(true);
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options.SetDebug (false);
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options.SetTimeoutUsec(500000);
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options.SetTrapExceptions(false);
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AddressRange munmap_range;
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if (sc.GetAddressRange(range_scope, 0, use_inline_block_range, munmap_range))
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{
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lldb::addr_t args[] = { addr, length };
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lldb::ThreadPlanSP call_plan_sp (new ThreadPlanCallFunction (*thread,
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munmap_range.GetBaseAddress(),
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CompilerType(),
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args,
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options));
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if (call_plan_sp)
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{
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StreamFile error_strm;
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StackFrame *frame = thread->GetStackFrameAtIndex (0).get();
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if (frame)
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{
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ExecutionContext exe_ctx;
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frame->CalculateExecutionContext (exe_ctx);
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ExpressionResults result = process->RunThreadPlan (exe_ctx,
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call_plan_sp,
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options,
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error_strm);
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if (result == eExpressionCompleted)
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{
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return true;
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}
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}
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}
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}
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}
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}
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return false;
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}
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// FIXME: This has nothing to do with Posix, it is just a convenience function that calls a
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// function of the form "void * (*)(void)". We should find a better place to put this.
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bool
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lldb_private::InferiorCall (Process *process,
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const Address *address,
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addr_t &returned_func,
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bool trap_exceptions)
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{
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Thread *thread = process->GetThreadList().GetExpressionExecutionThread().get();
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if (thread == NULL || address == NULL)
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return false;
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EvaluateExpressionOptions options;
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options.SetStopOthers(true);
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options.SetUnwindOnError(true);
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options.SetIgnoreBreakpoints(true);
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options.SetTryAllThreads(true);
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options.SetDebug (false);
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options.SetTimeoutUsec(500000);
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options.SetTrapExceptions(trap_exceptions);
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ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext();
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CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
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lldb::ThreadPlanSP call_plan_sp (new ThreadPlanCallFunction (*thread,
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*address,
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clang_void_ptr_type,
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llvm::ArrayRef<addr_t>(),
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options));
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if (call_plan_sp)
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{
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StreamString error_strm;
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StackFrame *frame = thread->GetStackFrameAtIndex (0).get();
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if (frame)
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{
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ExecutionContext exe_ctx;
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frame->CalculateExecutionContext (exe_ctx);
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ExpressionResults result = process->RunThreadPlan (exe_ctx,
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call_plan_sp,
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options,
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error_strm);
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if (result == eExpressionCompleted)
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{
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returned_func = call_plan_sp->GetReturnValueObject()->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
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if (process->GetAddressByteSize() == 4)
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{
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if (returned_func == UINT32_MAX)
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return false;
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}
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else if (process->GetAddressByteSize() == 8)
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{
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if (returned_func == UINT64_MAX)
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return false;
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}
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return true;
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}
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}
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}
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return false;
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}
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