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//===---- RuntimeDyldChecker.h - RuntimeDyld tester framework -----*- C++ -*-=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_RUNTIMEDYLDCHECKER_H
#define LLVM_EXECUTIONENGINE_RUNTIMEDYLDCHECKER_H
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/Support/Endian.h"
#include "llvm/TargetParser/SubtargetFeature.h"
#include "llvm/TargetParser/Triple.h"
#include <optional>
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
namespace llvm {
class StringRef;
class MCDisassembler;
class MemoryBuffer;
class MCInstPrinter;
class RuntimeDyld;
class RuntimeDyldCheckerImpl;
class raw_ostream;
/// Holds target-specific properties for a symbol.
using TargetFlagsType = uint8_t;
/// RuntimeDyld invariant checker for verifying that RuntimeDyld has
/// correctly applied relocations.
///
/// The RuntimeDyldChecker class evaluates expressions against an attached
/// RuntimeDyld instance to verify that relocations have been applied
/// correctly.
///
/// The expression language supports basic pointer arithmetic and bit-masking,
/// and has limited disassembler integration for accessing instruction
/// operands and the next PC (program counter) address for each instruction.
///
/// The language syntax is:
///
/// check = expr '=' expr
///
/// expr = binary_expr
/// | sliceable_expr
///
/// sliceable_expr = '*{' number '}' load_addr_expr [slice]
/// | '(' expr ')' [slice]
/// | ident_expr [slice]
/// | number [slice]
///
/// slice = '[' high-bit-index ':' low-bit-index ']'
///
/// load_addr_expr = symbol
/// | '(' symbol '+' number ')'
/// | '(' symbol '-' number ')'
///
/// ident_expr = 'decode_operand' '(' symbol ',' operand-index ')'
/// | 'next_pc' '(' symbol ')'
/// | 'stub_addr' '(' stub-container-name ',' symbol ')'
/// | 'got_addr' '(' stub-container-name ',' symbol ')'
/// | 'section_addr' '(' stub-container-name ',' symbol ')'
/// | symbol
///
/// binary_expr = expr '+' expr
/// | expr '-' expr
/// | expr '&' expr
/// | expr '|' expr
/// | expr '<<' expr
/// | expr '>>' expr
///
class RuntimeDyldChecker {
public:
class MemoryRegionInfo {
public:
MemoryRegionInfo() = default;
/// Constructor for symbols/sections with content and TargetFlag.
MemoryRegionInfo(ArrayRef<char> Content, JITTargetAddress TargetAddress,
TargetFlagsType TargetFlags)
: ContentPtr(Content.data()), Size(Content.size()),
TargetAddress(TargetAddress), TargetFlags(TargetFlags) {}
/// Constructor for zero-fill symbols/sections.
MemoryRegionInfo(uint64_t Size, JITTargetAddress TargetAddress)
: Size(Size), TargetAddress(TargetAddress) {}
/// Returns true if this is a zero-fill symbol/section.
bool isZeroFill() const {
assert(Size && "setContent/setZeroFill must be called first");
return !ContentPtr;
}
/// Set the content for this memory region.
void setContent(ArrayRef<char> Content) {
assert(!ContentPtr && !Size && "Content/zero-fill already set");
ContentPtr = Content.data();
Size = Content.size();
}
/// Set a zero-fill length for this memory region.
void setZeroFill(uint64_t Size) {
assert(!ContentPtr && !this->Size && "Content/zero-fill already set");
this->Size = Size;
}
/// Returns the content for this section if there is any.
ArrayRef<char> getContent() const {
assert(!isZeroFill() && "Can't get content for a zero-fill section");
return {ContentPtr, static_cast<size_t>(Size)};
}
/// Returns the zero-fill length for this section.
uint64_t getZeroFillLength() const {
assert(isZeroFill() && "Can't get zero-fill length for content section");
return Size;
}
/// Set the target address for this region.
void setTargetAddress(JITTargetAddress TargetAddress) {
assert(!this->TargetAddress && "TargetAddress already set");
this->TargetAddress = TargetAddress;
}
/// Return the target address for this region.
JITTargetAddress getTargetAddress() const { return TargetAddress; }
/// Get the target flags for this Symbol.
TargetFlagsType getTargetFlags() const { return TargetFlags; }
/// Set the target flags for this Symbol.
void setTargetFlags(TargetFlagsType Flags) {
assert(Flags <= 1 && "Add more bits to store more than one flag");
TargetFlags = Flags;
}
private:
const char *ContentPtr = nullptr;
uint64_t Size = 0;
JITTargetAddress TargetAddress = 0;
TargetFlagsType TargetFlags = 0;
};
using IsSymbolValidFunction = std::function<bool(StringRef Symbol)>;
using GetSymbolInfoFunction =
std::function<Expected<MemoryRegionInfo>(StringRef SymbolName)>;
using GetSectionInfoFunction = std::function<Expected<MemoryRegionInfo>(
StringRef FileName, StringRef SectionName)>;
using GetStubInfoFunction = std::function<Expected<MemoryRegionInfo>(
StringRef StubContainer, StringRef TargetName, StringRef StubKindFilter)>;
using GetGOTInfoFunction = std::function<Expected<MemoryRegionInfo>(
StringRef GOTContainer, StringRef TargetName)>;
RuntimeDyldChecker(IsSymbolValidFunction IsSymbolValid,
GetSymbolInfoFunction GetSymbolInfo,
GetSectionInfoFunction GetSectionInfo,
GetStubInfoFunction GetStubInfo,
GetGOTInfoFunction GetGOTInfo, llvm::endianness Endianness,
Triple TT, StringRef CPU, SubtargetFeatures TF,
raw_ostream &ErrStream);
~RuntimeDyldChecker();
/// Check a single expression against the attached RuntimeDyld
/// instance.
bool check(StringRef CheckExpr) const;
/// Scan the given memory buffer for lines beginning with the string
/// in RulePrefix. The remainder of the line is passed to the check
/// method to be evaluated as an expression.
bool checkAllRulesInBuffer(StringRef RulePrefix, MemoryBuffer *MemBuf) const;
/// Returns the address of the requested section (or an error message
/// in the second element of the pair if the address cannot be found).
///
/// if 'LocalAddress' is true, this returns the address of the section
/// within the linker's memory. If 'LocalAddress' is false it returns the
/// address within the target process (i.e. the load address).
std::pair<uint64_t, std::string> getSectionAddr(StringRef FileName,
StringRef SectionName,
bool LocalAddress);
/// If there is a section at the given local address, return its load
/// address, otherwise return std::nullopt.
std::optional<uint64_t> getSectionLoadAddress(void *LocalAddress) const;
private:
std::unique_ptr<RuntimeDyldCheckerImpl> Impl;
};
} // end namespace llvm
#endif
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