105 lines
4.3 KiB
C++
105 lines
4.3 KiB
C++
//--------------------------------------------------------------------*- C++ -*-
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// CLING - the C++ LLVM-based InterpreterG :)
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// author: Baozeng Ding <sploving1@gmail.com>
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// author: Vassil Vassilev <vasil.georgiev.vasilev@cern.ch>
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//
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// This file is dual-licensed: you can choose to license it under the University
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// of Illinois Open Source License or the GNU Lesser General Public License. See
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// LICENSE.TXT for details.
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//------------------------------------------------------------------------------
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#include "cling/Interpreter/Exception.h"
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#include "cling/Interpreter/InterpreterCallbacks.h"
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#include "cling/Interpreter/Interpreter.h"
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#include "cling/Utils/Validation.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Basic/SourceLocation.h"
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#include "clang/Sema/Sema.h"
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#include "clang/Sema/SemaDiagnostic.h"
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extern "C" {
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/// Throw an InvalidDerefException if the Arg pointer is invalid.
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///\param Interp: The interpreter that has compiled the code.
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///\param Expr: The expression corresponding determining the pointer value.
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///\param Arg: The pointer to be checked.
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///\returns void*, const-cast from Arg, to reduce the complexity in the
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/// calling AST nodes, at the expense of possibly doing a
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/// T* -> const void* -> const_cast<void*> -> T* round trip.
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void* cling_runtime_internal_throwIfInvalidPointer(void* Interp, void* Expr,
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const void* Arg) {
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const clang::Expr* const E = (const clang::Expr*)Expr;
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// The isValidAddress function return true even when the pointer is
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// null thus the checks have to be done before returning successfully from the
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// function in this specific order.
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if (!Arg) {
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cling::Interpreter* I = (cling::Interpreter*)Interp;
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clang::Sema& S = I->getCI()->getSema();
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// Print a nice backtrace.
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I->getCallbacks()->PrintStackTrace();
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throw cling::InvalidDerefException(&S, E,
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cling::InvalidDerefException::DerefType::NULL_DEREF);
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} else if (!cling::utils::isAddressValid(Arg)) {
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cling::Interpreter* I = (cling::Interpreter*)Interp;
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clang::Sema& S = I->getCI()->getSema();
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// Print a nice backtrace.
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I->getCallbacks()->PrintStackTrace();
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throw cling::InvalidDerefException(&S, E,
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cling::InvalidDerefException::DerefType::INVALID_MEM);
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}
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return const_cast<void*>(Arg);
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}
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}
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namespace cling {
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InterpreterException::InterpreterException(const std::string& What) :
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std::runtime_error(What), m_Sema(nullptr) {}
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InterpreterException::InterpreterException(const char* What, clang::Sema* S) :
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std::runtime_error(What), m_Sema(S) {}
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bool InterpreterException::diagnose() const { return false; }
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InterpreterException::~InterpreterException() noexcept {}
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InvalidDerefException::InvalidDerefException(clang::Sema* S,
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const clang::Expr* E,
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DerefType type)
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: InterpreterException(type == INVALID_MEM ?
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"Trying to access a pointer that points to an invalid memory address." :
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"Trying to dereference null pointer or trying to call routine taking "
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"non-null arguments", S),
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m_Arg(E), m_Type(type) {}
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InvalidDerefException::~InvalidDerefException() noexcept {}
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bool InvalidDerefException::diagnose() const {
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// Construct custom diagnostic: warning for invalid memory address;
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// no equivalent in clang.
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if (m_Type == cling::InvalidDerefException::DerefType::INVALID_MEM) {
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clang::DiagnosticsEngine& Diags = m_Sema->getDiagnostics();
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unsigned DiagID =
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Diags.getCustomDiagID(clang::DiagnosticsEngine::Warning,
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"invalid memory pointer passed to a callee:");
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Diags.Report(m_Arg->getLocStart(), DiagID) << m_Arg->getSourceRange();
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}
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else
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m_Sema->Diag(m_Arg->getLocStart(), clang::diag::warn_null_arg)
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<< m_Arg->getSourceRange();
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return true;
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}
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CompilationException::CompilationException(const std::string& Reason) :
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InterpreterException(Reason) {}
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CompilationException::~CompilationException() noexcept {}
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void CompilationException::throwingHandler(void * /*user_data*/,
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const std::string& reason,
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bool /*gen_crash_diag*/) {
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throw cling::CompilationException(reason);
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}
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} // end namespace cling
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