715 lines
28 KiB
C++
715 lines
28 KiB
C++
//===-- ClangExpressionDeclMap.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 liblldb_ClangExpressionDeclMap_h_
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#define liblldb_ClangExpressionDeclMap_h_
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// C Includes
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#include <signal.h>
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#include <stdint.h>
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// C++ Includes
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#include <vector>
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#include "ClangExpressionVariable.h"
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#include "ClangASTSource.h"
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// Other libraries and framework includes
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// Project includes
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#include "llvm/ADT/DenseMap.h"
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#include "clang/AST/Decl.h"
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#include "lldb/lldb-public.h"
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#include "lldb/Core/ClangForward.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Expression/Materializer.h"
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#include "lldb/Symbol/TaggedASTType.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Target/ExecutionContext.h"
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namespace lldb_private {
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//----------------------------------------------------------------------
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/// @class ClangExpressionDeclMap ClangExpressionDeclMap.h "lldb/Expression/ClangExpressionDeclMap.h"
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/// @brief Manages named entities that are defined in LLDB's debug information.
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///
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/// The Clang parser uses the ClangASTSource as an interface to request named
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/// entities from outside an expression. The ClangASTSource reports back, listing
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/// all possible objects corresponding to a particular name. But it in turn
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/// relies on ClangExpressionDeclMap, which performs several important functions.
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///
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/// First, it records what variables and functions were looked up and what Decls
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/// were returned for them.
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///
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/// Second, it constructs a struct on behalf of IRForTarget, recording which
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/// variables should be placed where and relaying this information back so that
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/// IRForTarget can generate context-independent code.
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///
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/// Third, it "materializes" this struct on behalf of the expression command,
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/// finding the current values of each variable and placing them into the
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/// struct so that it can be passed to the JITted version of the IR.
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///
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/// Fourth and finally, it "dematerializes" the struct after the JITted code has
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/// has executed, placing the new values back where it found the old ones.
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//----------------------------------------------------------------------
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class ClangExpressionDeclMap :
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public ClangASTSource
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{
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public:
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//------------------------------------------------------------------
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/// Constructor
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///
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/// Initializes class variables.
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///
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/// @param[in] keep_result_in_memory
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/// If true, inhibits the normal deallocation of the memory for
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/// the result persistent variable, and instead marks the variable
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/// as persisting.
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///
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/// @param[in] delegate
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/// If non-NULL, use this delegate to report result values. This
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/// allows the client ClangUserExpression to report a result.
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///
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/// @param[in] exe_ctx
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/// The execution context to use when parsing.
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//------------------------------------------------------------------
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ClangExpressionDeclMap (bool keep_result_in_memory,
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Materializer::PersistentVariableDelegate *result_delegate,
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ExecutionContext &exe_ctx);
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//------------------------------------------------------------------
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/// Destructor
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//------------------------------------------------------------------
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~ClangExpressionDeclMap() override;
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//------------------------------------------------------------------
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/// Enable the state needed for parsing and IR transformation.
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///
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/// @param[in] exe_ctx
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/// The execution context to use when finding types for variables.
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/// Also used to find a "scratch" AST context to store result types.
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///
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/// @param[in] materializer
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/// If non-NULL, the materializer to populate with information about
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/// the variables to use
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///
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/// @return
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/// True if parsing is possible; false if it is unsafe to continue.
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//------------------------------------------------------------------
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bool
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WillParse (ExecutionContext &exe_ctx,
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Materializer *materializer);
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void
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InstallCodeGenerator (clang::ASTConsumer *code_gen);
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//------------------------------------------------------------------
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/// [Used by ClangExpressionParser] For each variable that had an unknown
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/// type at the beginning of parsing, determine its final type now.
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///
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/// @return
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/// True on success; false otherwise.
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//------------------------------------------------------------------
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bool
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ResolveUnknownTypes();
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//------------------------------------------------------------------
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/// Disable the state needed for parsing and IR transformation.
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//------------------------------------------------------------------
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void
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DidParse ();
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Add a variable to the list of persistent
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/// variables for the process.
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///
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/// @param[in] decl
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/// The Clang declaration for the persistent variable, used for
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/// lookup during parsing.
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///
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/// @param[in] name
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/// The name of the persistent variable, usually $something.
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///
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/// @param[in] type
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/// The type of the variable, in the Clang parser's context.
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///
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/// @return
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/// True on success; false otherwise.
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//------------------------------------------------------------------
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bool
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AddPersistentVariable (const clang::NamedDecl *decl,
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const ConstString &name,
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TypeFromParser type,
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bool is_result,
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bool is_lvalue);
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Add a variable to the struct that needs to
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/// be materialized each time the expression runs.
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///
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/// @param[in] decl
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/// The Clang declaration for the variable.
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///
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/// @param[in] name
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/// The name of the variable.
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///
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/// @param[in] value
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/// The LLVM IR value for this variable.
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///
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/// @param[in] size
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/// The size of the variable in bytes.
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///
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/// @param[in] alignment
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/// The required alignment of the variable in bytes.
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///
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/// @return
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/// True on success; false otherwise.
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//------------------------------------------------------------------
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bool
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AddValueToStruct (const clang::NamedDecl *decl,
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const ConstString &name,
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llvm::Value *value,
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size_t size,
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lldb::offset_t alignment);
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Finalize the struct, laying out the position
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/// of each object in it.
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///
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/// @return
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/// True on success; false otherwise.
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//------------------------------------------------------------------
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bool
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DoStructLayout ();
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Get general information about the laid-out
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/// struct after DoStructLayout() has been called.
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///
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/// @param[out] num_elements
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/// The number of elements in the struct.
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///
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/// @param[out] size
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/// The size of the struct, in bytes.
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///
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/// @param[out] alignment
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/// The alignment of the struct, in bytes.
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///
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/// @return
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/// True if the information could be retrieved; false otherwise.
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//------------------------------------------------------------------
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bool
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GetStructInfo (uint32_t &num_elements,
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size_t &size,
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lldb::offset_t &alignment);
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Get specific information about one field
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/// of the laid-out struct after DoStructLayout() has been called.
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///
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/// @param[out] decl
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/// The parsed Decl for the field, as generated by ClangASTSource
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/// on ClangExpressionDeclMap's behalf. In the case of the result
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/// value, this will have the name $__lldb_result even if the
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/// result value ends up having the name $1. This is an
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/// implementation detail of IRForTarget.
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///
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/// @param[out] value
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/// The IR value for the field (usually a GlobalVariable). In
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/// the case of the result value, this will have the correct
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/// name ($1, for instance). This is an implementation detail
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/// of IRForTarget.
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///
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/// @param[out] offset
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/// The offset of the field from the beginning of the struct.
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/// As long as the struct is aligned according to its required
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/// alignment, this offset will align the field correctly.
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///
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/// @param[out] name
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/// The name of the field as used in materialization.
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///
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/// @param[in] index
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/// The index of the field about which information is requested.
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///
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/// @return
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/// True if the information could be retrieved; false otherwise.
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//------------------------------------------------------------------
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bool
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GetStructElement (const clang::NamedDecl *&decl,
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llvm::Value *&value,
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lldb::offset_t &offset,
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ConstString &name,
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uint32_t index);
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Get information about a function given its
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/// Decl.
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///
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/// @param[in] decl
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/// The parsed Decl for the Function, as generated by ClangASTSource
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/// on ClangExpressionDeclMap's behalf.
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///
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/// @param[out] ptr
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/// The absolute address of the function in the target.
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///
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/// @return
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/// True if the information could be retrieved; false otherwise.
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//------------------------------------------------------------------
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bool
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GetFunctionInfo (const clang::NamedDecl *decl,
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uint64_t &ptr);
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Get the address of a function given nothing
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/// but its name. Some functions are needed but didn't get Decls made
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/// during parsing -- specifically, sel_registerName is never called
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/// in the generated IR but we need to call it nonetheless.
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///
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/// @param[in] name
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/// The name of the function.
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///
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/// @param[out] ptr
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/// The absolute address of the function in the target.
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///
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/// @return
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/// True if the address could be retrieved; false otherwise.
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//------------------------------------------------------------------
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bool
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GetFunctionAddress (const ConstString &name,
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uint64_t &ptr);
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//------------------------------------------------------------------
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/// [Used by IRForTarget] Get the address of a symbol given nothing
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/// but its name.
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///
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/// @param[in] target
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/// The target to find the symbol in. If not provided,
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/// then the current parsing context's Target.
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///
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/// @param[in] process
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/// The process to use. For Objective-C symbols, the process's
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/// Objective-C language runtime may be queried if the process
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/// is non-NULL.
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///
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/// @param[in] name
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/// The name of the symbol.
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///
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/// @param[in] module
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/// The module to limit the search to. This can be NULL
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///
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/// @return
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/// Valid load address for the symbol
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//------------------------------------------------------------------
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lldb::addr_t
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GetSymbolAddress (Target &target,
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Process *process,
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const ConstString &name,
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lldb::SymbolType symbol_type,
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Module *module = NULL);
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lldb::addr_t
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GetSymbolAddress (const ConstString &name,
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lldb::SymbolType symbol_type);
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//------------------------------------------------------------------
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/// [Used by IRInterpreter] Get basic target information.
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///
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/// @param[out] byte_order
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/// The byte order of the target.
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///
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/// @param[out] address_byte_size
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/// The size of a pointer in bytes.
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///
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/// @return
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/// True if the information could be determined; false
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/// otherwise.
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//------------------------------------------------------------------
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struct TargetInfo
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{
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lldb::ByteOrder byte_order;
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size_t address_byte_size;
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TargetInfo() :
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byte_order(lldb::eByteOrderInvalid),
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address_byte_size(0)
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{
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}
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bool IsValid()
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{
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return (byte_order != lldb::eByteOrderInvalid &&
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address_byte_size != 0);
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}
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};
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TargetInfo GetTargetInfo();
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//------------------------------------------------------------------
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/// [Used by ClangASTSource] Find all entities matching a given name,
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/// using a NameSearchContext to make Decls for them.
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///
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/// @param[in] context
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/// The NameSearchContext that can construct Decls for this name.
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///
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/// @return
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/// True on success; false otherwise.
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//------------------------------------------------------------------
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void
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FindExternalVisibleDecls(NameSearchContext &context) override;
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//------------------------------------------------------------------
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/// Find all entities matching a given name in a given module/namespace,
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/// using a NameSearchContext to make Decls for them.
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///
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/// @param[in] context
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/// The NameSearchContext that can construct Decls for this name.
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///
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/// @param[in] module
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/// If non-NULL, the module to query.
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///
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/// @param[in] namespace_decl
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/// If valid and module is non-NULL, the parent namespace.
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///
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/// @param[in] name
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/// The name as a plain C string. The NameSearchContext contains
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/// a DeclarationName for the name so at first the name may seem
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/// redundant, but ClangExpressionDeclMap operates in RTTI land so
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/// it can't access DeclarationName.
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///
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/// @param[in] current_id
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/// The ID for the current FindExternalVisibleDecls invocation,
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/// for logging purposes.
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///
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/// @return
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/// True on success; false otherwise.
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//------------------------------------------------------------------
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void
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FindExternalVisibleDecls (NameSearchContext &context,
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lldb::ModuleSP module,
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CompilerDeclContext &namespace_decl,
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unsigned int current_id);
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private:
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ExpressionVariableList m_found_entities; ///< All entities that were looked up for the parser.
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ExpressionVariableList m_struct_members; ///< All entities that need to be placed in the struct.
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bool m_keep_result_in_memory; ///< True if result persistent variables generated by this expression should stay in memory.
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Materializer::PersistentVariableDelegate *m_result_delegate; ///< If non-NULL, used to report expression results to ClangUserExpression.
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//----------------------------------------------------------------------
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/// The following values should not live beyond parsing
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//----------------------------------------------------------------------
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class ParserVars
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{
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public:
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ParserVars(ClangExpressionDeclMap &decl_map) :
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m_decl_map(decl_map)
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{
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}
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Target *
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GetTarget()
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{
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if (m_exe_ctx.GetTargetPtr())
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return m_exe_ctx.GetTargetPtr();
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else if (m_sym_ctx.target_sp)
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m_sym_ctx.target_sp.get();
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return NULL;
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}
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ExecutionContext m_exe_ctx; ///< The execution context to use when parsing.
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SymbolContext m_sym_ctx; ///< The symbol context to use in finding variables and types.
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ClangPersistentVariables *m_persistent_vars = nullptr; ///< The persistent variables for the process.
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bool m_enable_lookups = false; ///< Set to true during parsing if we have found the first "$__lldb" name.
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TargetInfo m_target_info; ///< Basic information about the target.
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Materializer *m_materializer = nullptr; ///< If non-NULL, the materializer to use when reporting used variables.
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clang::ASTConsumer *m_code_gen = nullptr; ///< If non-NULL, a code generator that receives new top-level functions.
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private:
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ClangExpressionDeclMap &m_decl_map;
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DISALLOW_COPY_AND_ASSIGN (ParserVars);
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};
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std::unique_ptr<ParserVars> m_parser_vars;
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//----------------------------------------------------------------------
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/// Activate parser-specific variables
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//----------------------------------------------------------------------
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void
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EnableParserVars()
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{
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if (!m_parser_vars.get())
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m_parser_vars.reset(new ParserVars(*this));
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}
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//----------------------------------------------------------------------
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/// Deallocate parser-specific variables
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//----------------------------------------------------------------------
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void
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DisableParserVars()
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{
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m_parser_vars.reset();
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}
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//----------------------------------------------------------------------
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/// The following values contain layout information for the materialized
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/// struct, but are not specific to a single materialization
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//----------------------------------------------------------------------
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struct StructVars {
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StructVars() :
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m_struct_alignment(0),
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m_struct_size(0),
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m_struct_laid_out(false),
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m_result_name(),
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m_object_pointer_type(NULL, NULL)
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{
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}
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lldb::offset_t m_struct_alignment; ///< The alignment of the struct in bytes.
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size_t m_struct_size; ///< The size of the struct in bytes.
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bool m_struct_laid_out; ///< True if the struct has been laid out and the layout is valid (that is, no new fields have been added since).
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ConstString m_result_name; ///< The name of the result variable ($1, for example)
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TypeFromUser m_object_pointer_type; ///< The type of the "this" variable, if one exists
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};
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std::unique_ptr<StructVars> m_struct_vars;
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//----------------------------------------------------------------------
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/// Activate struct variables
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//----------------------------------------------------------------------
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void
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EnableStructVars()
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{
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if (!m_struct_vars.get())
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m_struct_vars.reset(new struct StructVars);
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}
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//----------------------------------------------------------------------
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/// Deallocate struct variables
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//----------------------------------------------------------------------
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void
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DisableStructVars()
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{
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m_struct_vars.reset();
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}
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//----------------------------------------------------------------------
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/// Get this parser's ID for use in extracting parser- and JIT-specific
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/// data from persistent variables.
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//----------------------------------------------------------------------
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uint64_t
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GetParserID()
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{
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return (uint64_t)this;
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}
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//------------------------------------------------------------------
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/// Given a target, find a data symbol that has the given name.
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///
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/// @param[in] target
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/// The target to use as the basis for the search.
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///
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/// @param[in] name
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/// The name as a plain C string.
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///
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/// @param[in] module
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/// The module to limit the search to. This can be NULL
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///
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/// @return
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/// The LLDB Symbol found, or NULL if none was found.
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//------------------------------------------------------------------
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const Symbol *
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FindGlobalDataSymbol (Target &target,
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const ConstString &name,
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Module *module = NULL);
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//------------------------------------------------------------------
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/// Given a target, find a variable that matches the given name and
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/// type.
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///
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/// @param[in] target
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/// The target to use as a basis for finding the variable.
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///
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/// @param[in] module
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/// If non-NULL, the module to search.
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///
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/// @param[in] name
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/// The name as a plain C string.
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///
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/// @param[in] namespace_decl
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/// If non-NULL and module is non-NULL, the parent namespace.
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///
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/// @param[in] type
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/// The required type for the variable. This function may be called
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/// during parsing, in which case we don't know its type; hence the
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/// default.
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///
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/// @return
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/// The LLDB Variable found, or NULL if none was found.
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//------------------------------------------------------------------
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lldb::VariableSP
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FindGlobalVariable (Target &target,
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lldb::ModuleSP &module,
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const ConstString &name,
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CompilerDeclContext *namespace_decl,
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TypeFromUser *type = NULL);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Get the value of a variable in a given execution context and return
|
|
/// the associated Types if needed.
|
|
///
|
|
/// @param[in] var
|
|
/// The variable to evaluate.
|
|
///
|
|
/// @param[out] var_location
|
|
/// The variable location value to fill in
|
|
///
|
|
/// @param[out] found_type
|
|
/// The type of the found value, as it was found in the user process.
|
|
/// This is only useful when the variable is being inspected on behalf
|
|
/// of the parser, hence the default.
|
|
///
|
|
/// @param[out] parser_type
|
|
/// The type of the found value, as it was copied into the parser's
|
|
/// AST context. This is only useful when the variable is being
|
|
/// inspected on behalf of the parser, hence the default.
|
|
///
|
|
/// @param[in] decl
|
|
/// The Decl to be looked up.
|
|
///
|
|
/// @return
|
|
/// Return true if the value was successfully filled in.
|
|
//------------------------------------------------------------------
|
|
bool
|
|
GetVariableValue (lldb::VariableSP &var,
|
|
lldb_private::Value &var_location,
|
|
TypeFromUser *found_type = NULL,
|
|
TypeFromParser *parser_type = NULL);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Use the NameSearchContext to generate a Decl for the given LLDB
|
|
/// Variable, and put it in the Tuple list.
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] var
|
|
/// The LLDB Variable that needs a Decl.
|
|
///
|
|
/// @param[in] valobj
|
|
/// The LLDB ValueObject for that variable.
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddOneVariable (NameSearchContext &context,
|
|
lldb::VariableSP var,
|
|
lldb::ValueObjectSP valobj,
|
|
unsigned int current_id);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Use the NameSearchContext to generate a Decl for the given
|
|
/// persistent variable, and put it in the list of found entities.
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] pvar
|
|
/// The persistent variable that needs a Decl.
|
|
///
|
|
/// @param[in] current_id
|
|
/// The ID of the current invocation of FindExternalVisibleDecls
|
|
/// for logging purposes.
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddOneVariable (NameSearchContext &context,
|
|
lldb::ExpressionVariableSP &pvar_sp,
|
|
unsigned int current_id);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Use the NameSearchContext to generate a Decl for the given LLDB
|
|
/// symbol (treated as a variable), and put it in the list of found
|
|
/// entities.
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] var
|
|
/// The LLDB Variable that needs a Decl.
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddOneGenericVariable (NameSearchContext &context,
|
|
const Symbol &symbol,
|
|
unsigned int current_id);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Use the NameSearchContext to generate a Decl for the given
|
|
/// function. (Functions are not placed in the Tuple list.) Can
|
|
/// handle both fully typed functions and generic functions.
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] fun
|
|
/// The Function that needs to be created. If non-NULL, this is
|
|
/// a fully-typed function.
|
|
///
|
|
/// @param[in] sym
|
|
/// The Symbol that corresponds to a function that needs to be
|
|
/// created with generic type (unitptr_t foo(...)).
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddOneFunction (NameSearchContext &context,
|
|
Function *fun,
|
|
Symbol *sym,
|
|
unsigned int current_id);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Use the NameSearchContext to generate a Decl for the given
|
|
/// register.
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] reg_info
|
|
/// The information corresponding to that register.
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddOneRegister (NameSearchContext &context,
|
|
const RegisterInfo *reg_info,
|
|
unsigned int current_id);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Use the NameSearchContext to generate a Decl for the given
|
|
/// type. (Types are not placed in the Tuple list.)
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] type
|
|
/// The type that needs to be created.
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddOneType (NameSearchContext &context,
|
|
TypeFromUser &type,
|
|
unsigned int current_id);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Generate a Decl for "*this" and add a member function declaration
|
|
/// to it for the expression, then report it.
|
|
///
|
|
/// @param[in] context
|
|
/// The NameSearchContext to use when constructing the Decl.
|
|
///
|
|
/// @param[in] type
|
|
/// The type for *this.
|
|
//------------------------------------------------------------------
|
|
void
|
|
AddThisType(NameSearchContext &context,
|
|
TypeFromUser &type,
|
|
unsigned int current_id);
|
|
};
|
|
|
|
} // namespace lldb_private
|
|
|
|
#endif // liblldb_ClangExpressionDeclMap_h_
|