97206d5727
This renames the LLDB error class to Status, as discussed on the lldb-dev mailing list. A change of this magnitude cannot easily be done without find and replace, but that has potential to catch unwanted occurrences of common strings such as "Error". Every effort was made to find all the obvious things such as the word "Error" appearing in a string, etc, but it's possible there are still some lingering occurences left around. Hopefully nothing too serious. llvm-svn: 302872
669 lines
26 KiB
C++
669 lines
26 KiB
C++
//===-- IRForTarget.h ---------------------------------------------*- C++
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//-*-===//
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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_IRForTarget_h_
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#define liblldb_IRForTarget_h_
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#include "lldb/Symbol/TaggedASTType.h"
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#include "lldb/Utility/ConstString.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/Stream.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/lldb-public.h"
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#include "llvm/Pass.h"
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#include <functional>
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#include <map>
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namespace llvm {
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class BasicBlock;
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class CallInst;
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class Constant;
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class ConstantInt;
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class Function;
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class GlobalValue;
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class GlobalVariable;
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class Instruction;
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class IntegerType;
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class Module;
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class StoreInst;
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class DataLayout;
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class Type;
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class Value;
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}
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namespace lldb_private {
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class ClangExpressionDeclMap;
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class IRExecutionUnit;
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class IRMemoryMap;
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}
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//----------------------------------------------------------------------
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/// @class IRForTarget IRForTarget.h "lldb/Expression/IRForTarget.h"
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/// @brief Transforms the IR for a function to run in the target
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///
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/// Once an expression has been parsed and converted to IR, it can run
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/// in two contexts: interpreted by LLDB as a DWARF location expression,
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/// or compiled by the JIT and inserted into the target process for
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/// execution.
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///
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/// IRForTarget makes the second possible, by applying a series of
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/// transformations to the IR which make it relocatable. These
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/// transformations are discussed in more detail next to their relevant
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/// functions.
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//----------------------------------------------------------------------
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class IRForTarget : public llvm::ModulePass {
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public:
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enum class LookupResult { Success, Fail, Ignore };
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//------------------------------------------------------------------
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/// Constructor
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///
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/// @param[in] decl_map
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/// The list of externally-referenced variables for the expression,
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/// for use in looking up globals and allocating the argument
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/// struct. See the documentation for ClangExpressionDeclMap.
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///
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/// @param[in] resolve_vars
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/// True if the external variable references (including persistent
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/// variables) should be resolved. If not, only external functions
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/// are resolved.
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///
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/// @param[in] execution_policy
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/// Determines whether an IR interpreter can be used to statically
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/// evaluate the expression.
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///
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/// @param[in] const_result
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/// This variable is populated with the statically-computed result
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/// of the function, if it has no side-effects and the result can
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/// be computed statically.
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///
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/// @param[in] execution_unit
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/// The holder for raw data associated with the expression.
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///
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/// @param[in] error_stream
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/// If non-NULL, a stream on which errors can be printed.
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///
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/// @param[in] func_name
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/// The name of the function to prepare for execution in the target.
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//------------------------------------------------------------------
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IRForTarget(lldb_private::ClangExpressionDeclMap *decl_map, bool resolve_vars,
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lldb_private::IRExecutionUnit &execution_unit,
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lldb_private::Stream &error_stream,
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const char *func_name = "$__lldb_expr");
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//------------------------------------------------------------------
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/// Destructor
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//------------------------------------------------------------------
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~IRForTarget() override;
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//------------------------------------------------------------------
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/// Run this IR transformer on a single module
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///
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/// Implementation of the llvm::ModulePass::runOnModule() function.
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///
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/// @param[in] llvm_module
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/// The module to run on. This module is searched for the function
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/// $__lldb_expr, and that function is passed to the passes one by
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/// one.
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///
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/// @param[in] interpreter_error
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/// An error. If the expression fails to be interpreted, this error
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/// is set to a reason why.
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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 runOnModule(llvm::Module &llvm_module) override;
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//------------------------------------------------------------------
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/// Interface stub
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///
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/// Implementation of the llvm::ModulePass::assignPassManager()
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/// function.
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//------------------------------------------------------------------
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void assignPassManager(llvm::PMStack &pass_mgr_stack,
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llvm::PassManagerType pass_mgr_type =
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llvm::PMT_ModulePassManager) override;
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//------------------------------------------------------------------
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/// Returns PMT_ModulePassManager
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///
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/// Implementation of the llvm::ModulePass::getPotentialPassManagerType()
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/// function.
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//------------------------------------------------------------------
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llvm::PassManagerType getPotentialPassManagerType() const override;
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private:
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//------------------------------------------------------------------
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/// Ensures that the current function's linkage is set to external.
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/// Otherwise the JIT may not return an address for it.
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///
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/// @param[in] llvm_function
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/// The function whose linkage is to be fixed.
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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 FixFunctionLinkage(llvm::Function &llvm_function);
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//------------------------------------------------------------------
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/// A module-level pass to replace all function pointers with their
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/// integer equivalents.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] llvm_module
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/// The module currently being processed.
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///
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/// @param[in] llvm_function
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/// The function currently being processed.
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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 HasSideEffects(llvm::Function &llvm_function);
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//------------------------------------------------------------------
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/// A function-level pass to check whether the function has side
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/// effects.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Get the address of a function, and a location to put the complete
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/// Value of the function if one is available.
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///
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/// @param[in] function
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/// The function to find the location of.
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///
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/// @param[out] ptr
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/// The location of the function in the target.
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///
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/// @param[out] name
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/// The resolved name of the function (matters for intrinsics).
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///
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/// @param[out] value_ptr
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/// A variable to put the function's completed Value* in, or NULL
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/// if the Value* shouldn't be stored anywhere.
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///
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/// @return
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/// The pointer.
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//------------------------------------------------------------------
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LookupResult GetFunctionAddress(llvm::Function *function, uint64_t &ptr,
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lldb_private::ConstString &name,
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llvm::Constant **&value_ptr);
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//------------------------------------------------------------------
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/// A function-level pass to take the generated global value
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/// $__lldb_expr_result and make it into a persistent variable.
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/// Also see ASTResultSynthesizer.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Find the NamedDecl corresponding to a Value. This interface is
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/// exposed for the IR interpreter.
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///
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/// @param[in] module
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/// The module containing metadata to search
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///
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/// @param[in] global
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/// The global entity to search for
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///
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/// @return
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/// The corresponding variable declaration
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//------------------------------------------------------------------
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public:
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static clang::NamedDecl *DeclForGlobal(const llvm::GlobalValue *global_val,
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llvm::Module *module);
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private:
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clang::NamedDecl *DeclForGlobal(llvm::GlobalValue *global);
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//------------------------------------------------------------------
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/// Set the constant result variable m_const_result to the provided
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/// constant, assuming it can be evaluated. The result variable
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/// will be reset to NULL later if the expression has side effects.
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///
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/// @param[in] initializer
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/// The constant initializer for the variable.
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///
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/// @param[in] name
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/// The name of the result variable.
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///
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/// @param[in] type
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/// The Clang type of the result variable.
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//------------------------------------------------------------------
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void MaybeSetConstantResult(llvm::Constant *initializer,
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const lldb_private::ConstString &name,
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lldb_private::TypeFromParser type);
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//------------------------------------------------------------------
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/// If the IR represents a cast of a variable, set m_const_result
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/// to the result of the cast. The result variable will be reset to
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/// NULL latger if the expression has side effects.
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///
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/// @param[in] type
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/// The Clang type of the result variable.
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//------------------------------------------------------------------
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void MaybeSetCastResult(lldb_private::TypeFromParser type);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] llvm_function
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/// The function currently being processed.
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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 CreateResultVariable(llvm::Function &llvm_function);
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//------------------------------------------------------------------
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/// A module-level pass to find Objective-C constant strings and
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/// transform them to calls to CFStringCreateWithBytes.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Rewrite a single Objective-C constant string.
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///
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/// @param[in] NSStr
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/// The constant NSString to be transformed
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///
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/// @param[in] CStr
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/// The constant C string inside the NSString. This will be
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/// passed as the bytes argument to CFStringCreateWithBytes.
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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 RewriteObjCConstString(llvm::GlobalVariable *NSStr,
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llvm::GlobalVariable *CStr);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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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 RewriteObjCConstStrings();
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//------------------------------------------------------------------
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/// A basic block-level pass to find all Objective-C method calls and
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/// rewrite them to use sel_registerName instead of statically allocated
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/// selectors. The reason is that the selectors are created on the
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/// assumption that the Objective-C runtime will scan the appropriate
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/// section and prepare them. This doesn't happen when code is copied
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/// into the target, though, and there's no easy way to induce the
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/// runtime to scan them. So instead we get our selectors from
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/// sel_registerName.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Replace a single selector reference
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///
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/// @param[in] selector_load
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/// The load of the statically-allocated selector.
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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 RewriteObjCSelector(llvm::Instruction *selector_load);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] basic_block
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/// The basic block currently being processed.
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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 RewriteObjCSelectors(llvm::BasicBlock &basic_block);
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//------------------------------------------------------------------
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/// A basic block-level pass to find all Objective-C class references that
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/// use the old-style Objective-C runtime and rewrite them to use
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/// class_getClass instead of statically allocated class references.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Replace a single old-style class reference
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///
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/// @param[in] selector_load
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/// The load of the statically-allocated selector.
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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 RewriteObjCClassReference(llvm::Instruction *class_load);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] basic_block
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/// The basic block currently being processed.
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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 RewriteObjCClassReferences(llvm::BasicBlock &basic_block);
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//------------------------------------------------------------------
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/// A basic block-level pass to find all newly-declared persistent
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/// variables and register them with the ClangExprDeclMap. This
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/// allows them to be materialized and dematerialized like normal
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/// external variables. Before transformation, these persistent
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/// variables look like normal locals, so they have an allocation.
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/// This pass excises these allocations and makes references look
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/// like external references where they will be resolved -- like all
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/// other external references -- by ResolveExternals().
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Handle a single allocation of a persistent variable
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///
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/// @param[in] persistent_alloc
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/// The allocation of the persistent variable.
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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 RewritePersistentAlloc(llvm::Instruction *persistent_alloc);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] basic_block
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/// The basic block currently being processed.
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//------------------------------------------------------------------
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bool RewritePersistentAllocs(llvm::BasicBlock &basic_block);
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//------------------------------------------------------------------
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/// A function-level pass to find all external variables and functions
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/// used in the IR. Each found external variable is added to the
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/// struct, and each external function is resolved in place, its call
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/// replaced with a call to a function pointer whose value is the
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/// address of the function in the target process.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Write an initializer to a memory array of assumed sufficient
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/// size.
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///
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/// @param[in] data
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/// A pointer to the data to write to.
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///
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/// @param[in] initializer
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/// The initializer itself.
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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 MaterializeInitializer(uint8_t *data, llvm::Constant *initializer);
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//------------------------------------------------------------------
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/// Move an internal variable into the static allocation section.
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///
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/// @param[in] global_variable
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/// The variable.
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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 MaterializeInternalVariable(llvm::GlobalVariable *global_variable);
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//------------------------------------------------------------------
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/// Handle a single externally-defined variable
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///
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/// @param[in] value
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/// The variable.
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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 MaybeHandleVariable(llvm::Value *value);
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//------------------------------------------------------------------
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/// Handle a single externally-defined symbol
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///
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/// @param[in] symbol
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/// The symbol.
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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 HandleSymbol(llvm::Value *symbol);
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//------------------------------------------------------------------
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/// Handle a single externally-defined Objective-C class
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///
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/// @param[in] classlist_reference
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/// The reference, usually "01L_OBJC_CLASSLIST_REFERENCES_$_n"
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/// where n (if present) is an index.
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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 HandleObjCClass(llvm::Value *classlist_reference);
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//------------------------------------------------------------------
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/// Handle all the arguments to a function call
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///
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/// @param[in] C
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/// The call instruction.
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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 MaybeHandleCallArguments(llvm::CallInst *call_inst);
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//------------------------------------------------------------------
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/// Resolve variable references in calls to external functions
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///
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/// @param[in] basic_block
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/// The basic block currently being processed.
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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 ResolveCalls(llvm::BasicBlock &basic_block);
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//------------------------------------------------------------------
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/// Remove calls to __cxa_atexit, which should never be generated by
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/// expressions.
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///
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/// @param[in] call_inst
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/// The call instruction.
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///
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/// @return
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/// True if the scan was successful; false if some operation
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/// failed
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//------------------------------------------------------------------
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bool RemoveCXAAtExit(llvm::BasicBlock &basic_block);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] basic_block
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/// The function currently being processed.
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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 ResolveExternals(llvm::Function &llvm_function);
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//------------------------------------------------------------------
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/// A basic block-level pass to excise guard variables from the code.
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/// The result for the function is passed through Clang as a static
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/// variable. Static variables normally have guard variables to
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/// ensure that they are only initialized once.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// Rewrite a load to a guard variable to return constant 0.
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///
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/// @param[in] guard_load
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/// The load instruction to zero out.
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//------------------------------------------------------------------
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void TurnGuardLoadIntoZero(llvm::Instruction *guard_load);
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] basic_block
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/// The basic block currently being processed.
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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 RemoveGuards(llvm::BasicBlock &basic_block);
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//------------------------------------------------------------------
|
|
/// A function-level pass to make all external variable references
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/// point at the correct offsets from the void* passed into the
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/// function. ClangExpressionDeclMap::DoStructLayout() must be called
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/// beforehand, so that the offsets are valid.
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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/// The top-level pass implementation
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///
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/// @param[in] llvm_function
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/// The function currently being processed.
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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 ReplaceVariables(llvm::Function &llvm_function);
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|
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/// Flags
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|
bool m_resolve_vars; ///< True if external variable references and persistent
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|
///variable references should be resolved
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|
lldb_private::ConstString
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|
m_func_name; ///< The name of the function to translate
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|
lldb_private::ConstString
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|
m_result_name; ///< The name of the result variable ($0, $1, ...)
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|
lldb_private::TypeFromParser
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|
m_result_type; ///< The type of the result variable.
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|
llvm::Module *m_module; ///< The module being processed, or NULL if that has
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///not been determined yet.
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|
std::unique_ptr<llvm::DataLayout> m_target_data; ///< The target data for the
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|
///module being processed, or
|
|
///NULL if there is no
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|
///module.
|
|
lldb_private::ClangExpressionDeclMap
|
|
*m_decl_map; ///< The DeclMap containing the Decls
|
|
llvm::Constant *m_CFStringCreateWithBytes; ///< The address of the function
|
|
///CFStringCreateWithBytes, cast to
|
|
///the
|
|
/// appropriate function pointer type
|
|
llvm::Constant *m_sel_registerName; ///< The address of the function
|
|
///sel_registerName, cast to the
|
|
///appropriate
|
|
/// function pointer type
|
|
llvm::Constant *m_objc_getClass; ///< The address of the function
|
|
///objc_getClass, cast to the
|
|
///appropriate
|
|
/// function pointer type
|
|
llvm::IntegerType
|
|
*m_intptr_ty; ///< The type of an integer large enough to hold a pointer.
|
|
lldb_private::Stream
|
|
&m_error_stream; ///< The stream on which errors should be printed
|
|
lldb_private::IRExecutionUnit &
|
|
m_execution_unit; ///< The execution unit containing the IR being created.
|
|
|
|
llvm::StoreInst *m_result_store; ///< If non-NULL, the store instruction that
|
|
///writes to the result variable. If
|
|
/// m_has_side_effects is true, this is NULL.
|
|
bool m_result_is_pointer; ///< True if the function's result in the AST is a
|
|
///pointer (see comments in
|
|
/// ASTResultSynthesizer::SynthesizeBodyResult)
|
|
|
|
llvm::GlobalVariable *m_reloc_placeholder; ///< A placeholder that will be
|
|
///replaced by a pointer to the
|
|
///final
|
|
/// location of the static allocation.
|
|
|
|
//------------------------------------------------------------------
|
|
/// UnfoldConstant operates on a constant [Old] which has just been
|
|
/// replaced with a value [New]. We assume that new_value has
|
|
/// been properly placed early in the function, in front of the
|
|
/// first instruction in the entry basic block
|
|
/// [FirstEntryInstruction].
|
|
///
|
|
/// UnfoldConstant reads through the uses of Old and replaces Old
|
|
/// in those uses with New. Where those uses are constants, the
|
|
/// function generates new instructions to compute the result of the
|
|
/// new, non-constant expression and places them before
|
|
/// FirstEntryInstruction. These instructions replace the constant
|
|
/// uses, so UnfoldConstant calls itself recursively for those.
|
|
///
|
|
/// @param[in] llvm_function
|
|
/// The function currently being processed.
|
|
///
|
|
/// @return
|
|
/// True on success; false otherwise
|
|
//------------------------------------------------------------------
|
|
|
|
class FunctionValueCache {
|
|
public:
|
|
typedef std::function<llvm::Value *(llvm::Function *)> Maker;
|
|
|
|
FunctionValueCache(Maker const &maker);
|
|
~FunctionValueCache();
|
|
llvm::Value *GetValue(llvm::Function *function);
|
|
|
|
private:
|
|
Maker const m_maker;
|
|
typedef std::map<llvm::Function *, llvm::Value *> FunctionValueMap;
|
|
FunctionValueMap m_values;
|
|
};
|
|
|
|
FunctionValueCache m_entry_instruction_finder;
|
|
|
|
static bool UnfoldConstant(llvm::Constant *old_constant,
|
|
llvm::Function *llvm_function,
|
|
FunctionValueCache &value_maker,
|
|
FunctionValueCache &entry_instruction_finder,
|
|
lldb_private::Stream &error_stream);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Construct a reference to m_reloc_placeholder with a given type
|
|
/// and offset. This typically happens after inserting data into
|
|
/// m_data_allocator.
|
|
///
|
|
/// @param[in] type
|
|
/// The type of the value being loaded.
|
|
///
|
|
/// @param[in] offset
|
|
/// The offset of the value from the base of m_data_allocator.
|
|
///
|
|
/// @return
|
|
/// The Constant for the reference, usually a ConstantExpr.
|
|
//------------------------------------------------------------------
|
|
llvm::Constant *BuildRelocation(llvm::Type *type, uint64_t offset);
|
|
|
|
//------------------------------------------------------------------
|
|
/// Commit the allocation in m_data_allocator and use its final
|
|
/// location to replace m_reloc_placeholder.
|
|
///
|
|
/// @param[in] module
|
|
/// The module that m_data_allocator resides in
|
|
///
|
|
/// @return
|
|
/// True on success; false otherwise
|
|
//------------------------------------------------------------------
|
|
bool CompleteDataAllocation();
|
|
};
|
|
|
|
#endif // liblldb_IRForTarget_h_
|