938 lines
34 KiB
C++
938 lines
34 KiB
C++
//===--- RuntimeDyldChecker.cpp - RuntimeDyld tester framework --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ExecutionEngine/RuntimeDyldChecker.h"
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#include "RuntimeDyldCheckerImpl.h"
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#include "RuntimeDyldImpl.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDisassembler/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/Path.h"
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#include <cctype>
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#include <memory>
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#include <utility>
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#define DEBUG_TYPE "rtdyld"
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using namespace llvm;
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namespace llvm {
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// Helper class that implements the language evaluated by RuntimeDyldChecker.
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class RuntimeDyldCheckerExprEval {
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public:
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RuntimeDyldCheckerExprEval(const RuntimeDyldCheckerImpl &Checker,
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raw_ostream &ErrStream)
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: Checker(Checker) {}
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bool evaluate(StringRef Expr) const {
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// Expect equality expression of the form 'LHS = RHS'.
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Expr = Expr.trim();
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size_t EQIdx = Expr.find('=');
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ParseContext OutsideLoad(false);
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// Evaluate LHS.
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StringRef LHSExpr = Expr.substr(0, EQIdx).rtrim();
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StringRef RemainingExpr;
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EvalResult LHSResult;
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std::tie(LHSResult, RemainingExpr) =
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evalComplexExpr(evalSimpleExpr(LHSExpr, OutsideLoad), OutsideLoad);
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if (LHSResult.hasError())
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return handleError(Expr, LHSResult);
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if (RemainingExpr != "")
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return handleError(Expr, unexpectedToken(RemainingExpr, LHSExpr, ""));
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// Evaluate RHS.
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StringRef RHSExpr = Expr.substr(EQIdx + 1).ltrim();
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EvalResult RHSResult;
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std::tie(RHSResult, RemainingExpr) =
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evalComplexExpr(evalSimpleExpr(RHSExpr, OutsideLoad), OutsideLoad);
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if (RHSResult.hasError())
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return handleError(Expr, RHSResult);
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if (RemainingExpr != "")
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return handleError(Expr, unexpectedToken(RemainingExpr, RHSExpr, ""));
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if (LHSResult.getValue() != RHSResult.getValue()) {
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Checker.ErrStream << "Expression '" << Expr << "' is false: "
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<< format("0x%" PRIx64, LHSResult.getValue())
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<< " != " << format("0x%" PRIx64, RHSResult.getValue())
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<< "\n";
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return false;
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}
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return true;
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}
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private:
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// RuntimeDyldCheckerExprEval requires some context when parsing exprs. In
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// particular, it needs to know whether a symbol is being evaluated in the
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// context of a load, in which case we want the linker's local address for
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// the symbol, or outside of a load, in which case we want the symbol's
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// address in the remote target.
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struct ParseContext {
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bool IsInsideLoad;
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ParseContext(bool IsInsideLoad) : IsInsideLoad(IsInsideLoad) {}
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};
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const RuntimeDyldCheckerImpl &Checker;
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enum class BinOpToken : unsigned {
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Invalid,
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Add,
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Sub,
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BitwiseAnd,
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BitwiseOr,
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ShiftLeft,
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ShiftRight
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};
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class EvalResult {
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public:
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EvalResult() : Value(0), ErrorMsg("") {}
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EvalResult(uint64_t Value) : Value(Value), ErrorMsg("") {}
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EvalResult(std::string ErrorMsg)
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: Value(0), ErrorMsg(std::move(ErrorMsg)) {}
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uint64_t getValue() const { return Value; }
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bool hasError() const { return ErrorMsg != ""; }
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const std::string &getErrorMsg() const { return ErrorMsg; }
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private:
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uint64_t Value;
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std::string ErrorMsg;
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};
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StringRef getTokenForError(StringRef Expr) const {
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if (Expr.empty())
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return "";
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StringRef Token, Remaining;
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if (isalpha(Expr[0]))
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std::tie(Token, Remaining) = parseSymbol(Expr);
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else if (isdigit(Expr[0]))
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std::tie(Token, Remaining) = parseNumberString(Expr);
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else {
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unsigned TokLen = 1;
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if (Expr.startswith("<<") || Expr.startswith(">>"))
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TokLen = 2;
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Token = Expr.substr(0, TokLen);
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}
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return Token;
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}
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EvalResult unexpectedToken(StringRef TokenStart, StringRef SubExpr,
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StringRef ErrText) const {
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std::string ErrorMsg("Encountered unexpected token '");
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ErrorMsg += getTokenForError(TokenStart);
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if (SubExpr != "") {
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ErrorMsg += "' while parsing subexpression '";
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ErrorMsg += SubExpr;
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}
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ErrorMsg += "'";
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if (ErrText != "") {
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ErrorMsg += " ";
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ErrorMsg += ErrText;
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}
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return EvalResult(std::move(ErrorMsg));
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}
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bool handleError(StringRef Expr, const EvalResult &R) const {
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assert(R.hasError() && "Not an error result.");
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Checker.ErrStream << "Error evaluating expression '" << Expr
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<< "': " << R.getErrorMsg() << "\n";
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return false;
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}
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std::pair<BinOpToken, StringRef> parseBinOpToken(StringRef Expr) const {
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if (Expr.empty())
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return std::make_pair(BinOpToken::Invalid, "");
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// Handle the two 2-character tokens.
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if (Expr.startswith("<<"))
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return std::make_pair(BinOpToken::ShiftLeft, Expr.substr(2).ltrim());
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if (Expr.startswith(">>"))
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return std::make_pair(BinOpToken::ShiftRight, Expr.substr(2).ltrim());
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// Handle one-character tokens.
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BinOpToken Op;
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switch (Expr[0]) {
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default:
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return std::make_pair(BinOpToken::Invalid, Expr);
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case '+':
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Op = BinOpToken::Add;
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break;
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case '-':
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Op = BinOpToken::Sub;
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break;
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case '&':
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Op = BinOpToken::BitwiseAnd;
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break;
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case '|':
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Op = BinOpToken::BitwiseOr;
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break;
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}
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return std::make_pair(Op, Expr.substr(1).ltrim());
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}
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EvalResult computeBinOpResult(BinOpToken Op, const EvalResult &LHSResult,
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const EvalResult &RHSResult) const {
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switch (Op) {
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default:
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llvm_unreachable("Tried to evaluate unrecognized operation.");
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case BinOpToken::Add:
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return EvalResult(LHSResult.getValue() + RHSResult.getValue());
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case BinOpToken::Sub:
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return EvalResult(LHSResult.getValue() - RHSResult.getValue());
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case BinOpToken::BitwiseAnd:
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return EvalResult(LHSResult.getValue() & RHSResult.getValue());
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case BinOpToken::BitwiseOr:
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return EvalResult(LHSResult.getValue() | RHSResult.getValue());
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case BinOpToken::ShiftLeft:
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return EvalResult(LHSResult.getValue() << RHSResult.getValue());
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case BinOpToken::ShiftRight:
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return EvalResult(LHSResult.getValue() >> RHSResult.getValue());
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}
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}
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// Parse a symbol and return a (string, string) pair representing the symbol
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// name and expression remaining to be parsed.
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std::pair<StringRef, StringRef> parseSymbol(StringRef Expr) const {
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size_t FirstNonSymbol = Expr.find_first_not_of("0123456789"
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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":_.$");
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return std::make_pair(Expr.substr(0, FirstNonSymbol),
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Expr.substr(FirstNonSymbol).ltrim());
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}
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// Evaluate a call to decode_operand. Decode the instruction operand at the
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// given symbol and get the value of the requested operand.
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// Returns an error if the instruction cannot be decoded, or the requested
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// operand is not an immediate.
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// On success, retuns a pair containing the value of the operand, plus
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// the expression remaining to be evaluated.
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std::pair<EvalResult, StringRef> evalDecodeOperand(StringRef Expr) const {
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if (!Expr.startswith("("))
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return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
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StringRef RemainingExpr = Expr.substr(1).ltrim();
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StringRef Symbol;
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std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr);
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if (!Checker.isSymbolValid(Symbol))
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return std::make_pair(
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EvalResult(("Cannot decode unknown symbol '" + Symbol + "'").str()),
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"");
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if (!RemainingExpr.startswith(","))
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return std::make_pair(
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unexpectedToken(RemainingExpr, RemainingExpr, "expected ','"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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EvalResult OpIdxExpr;
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std::tie(OpIdxExpr, RemainingExpr) = evalNumberExpr(RemainingExpr);
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if (OpIdxExpr.hasError())
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return std::make_pair(OpIdxExpr, "");
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if (!RemainingExpr.startswith(")"))
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return std::make_pair(
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unexpectedToken(RemainingExpr, RemainingExpr, "expected ')'"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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MCInst Inst;
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uint64_t Size;
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if (!decodeInst(Symbol, Inst, Size))
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return std::make_pair(
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EvalResult(("Couldn't decode instruction at '" + Symbol + "'").str()),
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"");
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unsigned OpIdx = OpIdxExpr.getValue();
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if (OpIdx >= Inst.getNumOperands()) {
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std::string ErrMsg;
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raw_string_ostream ErrMsgStream(ErrMsg);
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ErrMsgStream << "Invalid operand index '" << format("%i", OpIdx)
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<< "' for instruction '" << Symbol
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<< "'. Instruction has only "
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<< format("%i", Inst.getNumOperands())
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<< " operands.\nInstruction is:\n ";
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Inst.dump_pretty(ErrMsgStream, Checker.InstPrinter);
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return std::make_pair(EvalResult(ErrMsgStream.str()), "");
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}
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const MCOperand &Op = Inst.getOperand(OpIdx);
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if (!Op.isImm()) {
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std::string ErrMsg;
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raw_string_ostream ErrMsgStream(ErrMsg);
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ErrMsgStream << "Operand '" << format("%i", OpIdx) << "' of instruction '"
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<< Symbol << "' is not an immediate.\nInstruction is:\n ";
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Inst.dump_pretty(ErrMsgStream, Checker.InstPrinter);
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return std::make_pair(EvalResult(ErrMsgStream.str()), "");
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}
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return std::make_pair(EvalResult(Op.getImm()), RemainingExpr);
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}
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// Evaluate a call to next_pc.
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// Decode the instruction at the given symbol and return the following program
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// counter.
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// Returns an error if the instruction cannot be decoded.
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// On success, returns a pair containing the next PC, plus of the
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// expression remaining to be evaluated.
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std::pair<EvalResult, StringRef> evalNextPC(StringRef Expr,
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ParseContext PCtx) const {
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if (!Expr.startswith("("))
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return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
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StringRef RemainingExpr = Expr.substr(1).ltrim();
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StringRef Symbol;
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std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr);
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if (!Checker.isSymbolValid(Symbol))
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return std::make_pair(
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EvalResult(("Cannot decode unknown symbol '" + Symbol + "'").str()),
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"");
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if (!RemainingExpr.startswith(")"))
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return std::make_pair(
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unexpectedToken(RemainingExpr, RemainingExpr, "expected ')'"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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MCInst Inst;
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uint64_t InstSize;
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if (!decodeInst(Symbol, Inst, InstSize))
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return std::make_pair(
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EvalResult(("Couldn't decode instruction at '" + Symbol + "'").str()),
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"");
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uint64_t SymbolAddr = PCtx.IsInsideLoad
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? Checker.getSymbolLocalAddr(Symbol)
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: Checker.getSymbolRemoteAddr(Symbol);
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uint64_t NextPC = SymbolAddr + InstSize;
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return std::make_pair(EvalResult(NextPC), RemainingExpr);
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}
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// Evaluate a call to stub_addr.
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// Look up and return the address of the stub for the given
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// (<file name>, <section name>, <symbol name>) tuple.
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// On success, returns a pair containing the stub address, plus the expression
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// remaining to be evaluated.
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std::pair<EvalResult, StringRef> evalStubAddr(StringRef Expr,
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ParseContext PCtx) const {
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if (!Expr.startswith("("))
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return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
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StringRef RemainingExpr = Expr.substr(1).ltrim();
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// Handle file-name specially, as it may contain characters that aren't
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// legal for symbols.
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StringRef FileName;
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size_t ComaIdx = RemainingExpr.find(',');
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FileName = RemainingExpr.substr(0, ComaIdx).rtrim();
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RemainingExpr = RemainingExpr.substr(ComaIdx).ltrim();
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if (!RemainingExpr.startswith(","))
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return std::make_pair(
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unexpectedToken(RemainingExpr, Expr, "expected ','"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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StringRef SectionName;
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std::tie(SectionName, RemainingExpr) = parseSymbol(RemainingExpr);
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if (!RemainingExpr.startswith(","))
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return std::make_pair(
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unexpectedToken(RemainingExpr, Expr, "expected ','"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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StringRef Symbol;
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std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr);
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if (!RemainingExpr.startswith(")"))
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return std::make_pair(
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unexpectedToken(RemainingExpr, Expr, "expected ')'"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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uint64_t StubAddr;
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std::string ErrorMsg = "";
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std::tie(StubAddr, ErrorMsg) = Checker.getStubAddrFor(
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FileName, SectionName, Symbol, PCtx.IsInsideLoad);
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if (ErrorMsg != "")
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return std::make_pair(EvalResult(ErrorMsg), "");
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return std::make_pair(EvalResult(StubAddr), RemainingExpr);
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}
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std::pair<EvalResult, StringRef> evalSectionAddr(StringRef Expr,
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ParseContext PCtx) const {
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if (!Expr.startswith("("))
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return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
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StringRef RemainingExpr = Expr.substr(1).ltrim();
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// Handle file-name specially, as it may contain characters that aren't
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// legal for symbols.
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StringRef FileName;
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size_t ComaIdx = RemainingExpr.find(',');
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FileName = RemainingExpr.substr(0, ComaIdx).rtrim();
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RemainingExpr = RemainingExpr.substr(ComaIdx).ltrim();
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if (!RemainingExpr.startswith(","))
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return std::make_pair(
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unexpectedToken(RemainingExpr, Expr, "expected ','"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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StringRef SectionName;
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std::tie(SectionName, RemainingExpr) = parseSymbol(RemainingExpr);
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if (!RemainingExpr.startswith(")"))
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return std::make_pair(
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unexpectedToken(RemainingExpr, Expr, "expected ')'"), "");
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RemainingExpr = RemainingExpr.substr(1).ltrim();
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uint64_t StubAddr;
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std::string ErrorMsg = "";
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std::tie(StubAddr, ErrorMsg) = Checker.getSectionAddr(
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FileName, SectionName, PCtx.IsInsideLoad);
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if (ErrorMsg != "")
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return std::make_pair(EvalResult(ErrorMsg), "");
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return std::make_pair(EvalResult(StubAddr), RemainingExpr);
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}
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// Evaluate an identiefer expr, which may be a symbol, or a call to
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// one of the builtin functions: get_insn_opcode or get_insn_length.
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// Return the result, plus the expression remaining to be parsed.
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std::pair<EvalResult, StringRef> evalIdentifierExpr(StringRef Expr,
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ParseContext PCtx) const {
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StringRef Symbol;
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StringRef RemainingExpr;
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std::tie(Symbol, RemainingExpr) = parseSymbol(Expr);
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// Check for builtin function calls.
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if (Symbol == "decode_operand")
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return evalDecodeOperand(RemainingExpr);
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else if (Symbol == "next_pc")
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return evalNextPC(RemainingExpr, PCtx);
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else if (Symbol == "stub_addr")
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return evalStubAddr(RemainingExpr, PCtx);
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else if (Symbol == "section_addr")
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return evalSectionAddr(RemainingExpr, PCtx);
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if (!Checker.isSymbolValid(Symbol)) {
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std::string ErrMsg("No known address for symbol '");
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ErrMsg += Symbol;
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ErrMsg += "'";
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if (Symbol.startswith("L"))
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ErrMsg += " (this appears to be an assembler local label - "
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" perhaps drop the 'L'?)";
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return std::make_pair(EvalResult(ErrMsg), "");
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}
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// The value for the symbol depends on the context we're evaluating in:
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// Inside a load this is the address in the linker's memory, outside a
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// load it's the address in the target processes memory.
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uint64_t Value = PCtx.IsInsideLoad ? Checker.getSymbolLocalAddr(Symbol)
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: Checker.getSymbolRemoteAddr(Symbol);
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// Looks like a plain symbol reference.
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return std::make_pair(EvalResult(Value), RemainingExpr);
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}
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// Parse a number (hexadecimal or decimal) and return a (string, string)
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// pair representing the number and the expression remaining to be parsed.
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std::pair<StringRef, StringRef> parseNumberString(StringRef Expr) const {
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size_t FirstNonDigit = StringRef::npos;
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if (Expr.startswith("0x")) {
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FirstNonDigit = Expr.find_first_not_of("0123456789abcdefABCDEF", 2);
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if (FirstNonDigit == StringRef::npos)
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FirstNonDigit = Expr.size();
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} else {
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FirstNonDigit = Expr.find_first_not_of("0123456789");
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if (FirstNonDigit == StringRef::npos)
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FirstNonDigit = Expr.size();
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}
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return std::make_pair(Expr.substr(0, FirstNonDigit),
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Expr.substr(FirstNonDigit));
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}
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// Evaluate a constant numeric expression (hexidecimal or decimal) and
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// return a pair containing the result, and the expression remaining to be
|
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// evaluated.
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std::pair<EvalResult, StringRef> evalNumberExpr(StringRef Expr) const {
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StringRef ValueStr;
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StringRef RemainingExpr;
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std::tie(ValueStr, RemainingExpr) = parseNumberString(Expr);
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if (ValueStr.empty() || !isdigit(ValueStr[0]))
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return std::make_pair(
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unexpectedToken(RemainingExpr, RemainingExpr, "expected number"), "");
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uint64_t Value;
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ValueStr.getAsInteger(0, Value);
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return std::make_pair(EvalResult(Value), RemainingExpr);
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}
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|
|
// Evaluate an expression of the form "(<expr>)" and return a pair
|
|
// containing the result of evaluating <expr>, plus the expression
|
|
// remaining to be parsed.
|
|
std::pair<EvalResult, StringRef> evalParensExpr(StringRef Expr,
|
|
ParseContext PCtx) const {
|
|
assert(Expr.startswith("(") && "Not a parenthesized expression");
|
|
EvalResult SubExprResult;
|
|
StringRef RemainingExpr;
|
|
std::tie(SubExprResult, RemainingExpr) =
|
|
evalComplexExpr(evalSimpleExpr(Expr.substr(1).ltrim(), PCtx), PCtx);
|
|
if (SubExprResult.hasError())
|
|
return std::make_pair(SubExprResult, "");
|
|
if (!RemainingExpr.startswith(")"))
|
|
return std::make_pair(
|
|
unexpectedToken(RemainingExpr, Expr, "expected ')'"), "");
|
|
RemainingExpr = RemainingExpr.substr(1).ltrim();
|
|
return std::make_pair(SubExprResult, RemainingExpr);
|
|
}
|
|
|
|
// Evaluate an expression in one of the following forms:
|
|
// *{<number>}<expr>
|
|
// Return a pair containing the result, plus the expression remaining to be
|
|
// parsed.
|
|
std::pair<EvalResult, StringRef> evalLoadExpr(StringRef Expr) const {
|
|
assert(Expr.startswith("*") && "Not a load expression");
|
|
StringRef RemainingExpr = Expr.substr(1).ltrim();
|
|
|
|
// Parse read size.
|
|
if (!RemainingExpr.startswith("{"))
|
|
return std::make_pair(EvalResult("Expected '{' following '*'."), "");
|
|
RemainingExpr = RemainingExpr.substr(1).ltrim();
|
|
EvalResult ReadSizeExpr;
|
|
std::tie(ReadSizeExpr, RemainingExpr) = evalNumberExpr(RemainingExpr);
|
|
if (ReadSizeExpr.hasError())
|
|
return std::make_pair(ReadSizeExpr, RemainingExpr);
|
|
uint64_t ReadSize = ReadSizeExpr.getValue();
|
|
if (ReadSize < 1 || ReadSize > 8)
|
|
return std::make_pair(EvalResult("Invalid size for dereference."), "");
|
|
if (!RemainingExpr.startswith("}"))
|
|
return std::make_pair(EvalResult("Missing '}' for dereference."), "");
|
|
RemainingExpr = RemainingExpr.substr(1).ltrim();
|
|
|
|
// Evaluate the expression representing the load address.
|
|
ParseContext LoadCtx(true);
|
|
EvalResult LoadAddrExprResult;
|
|
std::tie(LoadAddrExprResult, RemainingExpr) =
|
|
evalComplexExpr(evalSimpleExpr(RemainingExpr, LoadCtx), LoadCtx);
|
|
|
|
if (LoadAddrExprResult.hasError())
|
|
return std::make_pair(LoadAddrExprResult, "");
|
|
|
|
uint64_t LoadAddr = LoadAddrExprResult.getValue();
|
|
|
|
return std::make_pair(
|
|
EvalResult(Checker.readMemoryAtAddr(LoadAddr, ReadSize)),
|
|
RemainingExpr);
|
|
}
|
|
|
|
// Evaluate a "simple" expression. This is any expression that _isn't_ an
|
|
// un-parenthesized binary expression.
|
|
//
|
|
// "Simple" expressions can be optionally bit-sliced. See evalSlicedExpr.
|
|
//
|
|
// Returns a pair containing the result of the evaluation, plus the
|
|
// expression remaining to be parsed.
|
|
std::pair<EvalResult, StringRef> evalSimpleExpr(StringRef Expr,
|
|
ParseContext PCtx) const {
|
|
EvalResult SubExprResult;
|
|
StringRef RemainingExpr;
|
|
|
|
if (Expr.empty())
|
|
return std::make_pair(EvalResult("Unexpected end of expression"), "");
|
|
|
|
if (Expr[0] == '(')
|
|
std::tie(SubExprResult, RemainingExpr) = evalParensExpr(Expr, PCtx);
|
|
else if (Expr[0] == '*')
|
|
std::tie(SubExprResult, RemainingExpr) = evalLoadExpr(Expr);
|
|
else if (isalpha(Expr[0]) || Expr[0] == '_')
|
|
std::tie(SubExprResult, RemainingExpr) = evalIdentifierExpr(Expr, PCtx);
|
|
else if (isdigit(Expr[0]))
|
|
std::tie(SubExprResult, RemainingExpr) = evalNumberExpr(Expr);
|
|
else
|
|
return std::make_pair(
|
|
unexpectedToken(Expr, Expr,
|
|
"expected '(', '*', identifier, or number"), "");
|
|
|
|
if (SubExprResult.hasError())
|
|
return std::make_pair(SubExprResult, RemainingExpr);
|
|
|
|
// Evaluate bit-slice if present.
|
|
if (RemainingExpr.startswith("["))
|
|
std::tie(SubExprResult, RemainingExpr) =
|
|
evalSliceExpr(std::make_pair(SubExprResult, RemainingExpr));
|
|
|
|
return std::make_pair(SubExprResult, RemainingExpr);
|
|
}
|
|
|
|
// Evaluate a bit-slice of an expression.
|
|
// A bit-slice has the form "<expr>[high:low]". The result of evaluating a
|
|
// slice is the bits between high and low (inclusive) in the original
|
|
// expression, right shifted so that the "low" bit is in position 0 in the
|
|
// result.
|
|
// Returns a pair containing the result of the slice operation, plus the
|
|
// expression remaining to be parsed.
|
|
std::pair<EvalResult, StringRef>
|
|
evalSliceExpr(const std::pair<EvalResult, StringRef> &Ctx) const {
|
|
EvalResult SubExprResult;
|
|
StringRef RemainingExpr;
|
|
std::tie(SubExprResult, RemainingExpr) = Ctx;
|
|
|
|
assert(RemainingExpr.startswith("[") && "Not a slice expr.");
|
|
RemainingExpr = RemainingExpr.substr(1).ltrim();
|
|
|
|
EvalResult HighBitExpr;
|
|
std::tie(HighBitExpr, RemainingExpr) = evalNumberExpr(RemainingExpr);
|
|
|
|
if (HighBitExpr.hasError())
|
|
return std::make_pair(HighBitExpr, RemainingExpr);
|
|
|
|
if (!RemainingExpr.startswith(":"))
|
|
return std::make_pair(
|
|
unexpectedToken(RemainingExpr, RemainingExpr, "expected ':'"), "");
|
|
RemainingExpr = RemainingExpr.substr(1).ltrim();
|
|
|
|
EvalResult LowBitExpr;
|
|
std::tie(LowBitExpr, RemainingExpr) = evalNumberExpr(RemainingExpr);
|
|
|
|
if (LowBitExpr.hasError())
|
|
return std::make_pair(LowBitExpr, RemainingExpr);
|
|
|
|
if (!RemainingExpr.startswith("]"))
|
|
return std::make_pair(
|
|
unexpectedToken(RemainingExpr, RemainingExpr, "expected ']'"), "");
|
|
RemainingExpr = RemainingExpr.substr(1).ltrim();
|
|
|
|
unsigned HighBit = HighBitExpr.getValue();
|
|
unsigned LowBit = LowBitExpr.getValue();
|
|
uint64_t Mask = ((uint64_t)1 << (HighBit - LowBit + 1)) - 1;
|
|
uint64_t SlicedValue = (SubExprResult.getValue() >> LowBit) & Mask;
|
|
return std::make_pair(EvalResult(SlicedValue), RemainingExpr);
|
|
}
|
|
|
|
// Evaluate a "complex" expression.
|
|
// Takes an already evaluated subexpression and checks for the presence of a
|
|
// binary operator, computing the result of the binary operation if one is
|
|
// found. Used to make arithmetic expressions left-associative.
|
|
// Returns a pair containing the ultimate result of evaluating the
|
|
// expression, plus the expression remaining to be evaluated.
|
|
std::pair<EvalResult, StringRef>
|
|
evalComplexExpr(const std::pair<EvalResult, StringRef> &LHSAndRemaining,
|
|
ParseContext PCtx) const {
|
|
EvalResult LHSResult;
|
|
StringRef RemainingExpr;
|
|
std::tie(LHSResult, RemainingExpr) = LHSAndRemaining;
|
|
|
|
// If there was an error, or there's nothing left to evaluate, return the
|
|
// result.
|
|
if (LHSResult.hasError() || RemainingExpr == "")
|
|
return std::make_pair(LHSResult, RemainingExpr);
|
|
|
|
// Otherwise check if this is a binary expressioan.
|
|
BinOpToken BinOp;
|
|
std::tie(BinOp, RemainingExpr) = parseBinOpToken(RemainingExpr);
|
|
|
|
// If this isn't a recognized expression just return.
|
|
if (BinOp == BinOpToken::Invalid)
|
|
return std::make_pair(LHSResult, RemainingExpr);
|
|
|
|
// This is a recognized bin-op. Evaluate the RHS, then evaluate the binop.
|
|
EvalResult RHSResult;
|
|
std::tie(RHSResult, RemainingExpr) = evalSimpleExpr(RemainingExpr, PCtx);
|
|
|
|
// If there was an error evaluating the RHS, return it.
|
|
if (RHSResult.hasError())
|
|
return std::make_pair(RHSResult, RemainingExpr);
|
|
|
|
// This is a binary expression - evaluate and try to continue as a
|
|
// complex expr.
|
|
EvalResult ThisResult(computeBinOpResult(BinOp, LHSResult, RHSResult));
|
|
|
|
return evalComplexExpr(std::make_pair(ThisResult, RemainingExpr), PCtx);
|
|
}
|
|
|
|
bool decodeInst(StringRef Symbol, MCInst &Inst, uint64_t &Size) const {
|
|
MCDisassembler *Dis = Checker.Disassembler;
|
|
StringRef SectionMem = Checker.getSubsectionStartingAt(Symbol);
|
|
ArrayRef<uint8_t> SectionBytes(
|
|
reinterpret_cast<const uint8_t *>(SectionMem.data()),
|
|
SectionMem.size());
|
|
|
|
MCDisassembler::DecodeStatus S =
|
|
Dis->getInstruction(Inst, Size, SectionBytes, 0, nulls(), nulls());
|
|
|
|
return (S == MCDisassembler::Success);
|
|
}
|
|
};
|
|
}
|
|
|
|
RuntimeDyldCheckerImpl::RuntimeDyldCheckerImpl(RuntimeDyld &RTDyld,
|
|
MCDisassembler *Disassembler,
|
|
MCInstPrinter *InstPrinter,
|
|
raw_ostream &ErrStream)
|
|
: RTDyld(RTDyld), Disassembler(Disassembler), InstPrinter(InstPrinter),
|
|
ErrStream(ErrStream) {
|
|
RTDyld.Checker = this;
|
|
}
|
|
|
|
bool RuntimeDyldCheckerImpl::check(StringRef CheckExpr) const {
|
|
CheckExpr = CheckExpr.trim();
|
|
DEBUG(dbgs() << "RuntimeDyldChecker: Checking '" << CheckExpr << "'...\n");
|
|
RuntimeDyldCheckerExprEval P(*this, ErrStream);
|
|
bool Result = P.evaluate(CheckExpr);
|
|
(void)Result;
|
|
DEBUG(dbgs() << "RuntimeDyldChecker: '" << CheckExpr << "' "
|
|
<< (Result ? "passed" : "FAILED") << ".\n");
|
|
return Result;
|
|
}
|
|
|
|
bool RuntimeDyldCheckerImpl::checkAllRulesInBuffer(StringRef RulePrefix,
|
|
MemoryBuffer *MemBuf) const {
|
|
bool DidAllTestsPass = true;
|
|
unsigned NumRules = 0;
|
|
|
|
const char *LineStart = MemBuf->getBufferStart();
|
|
|
|
// Eat whitespace.
|
|
while (LineStart != MemBuf->getBufferEnd() && std::isspace(*LineStart))
|
|
++LineStart;
|
|
|
|
while (LineStart != MemBuf->getBufferEnd() && *LineStart != '\0') {
|
|
const char *LineEnd = LineStart;
|
|
while (LineEnd != MemBuf->getBufferEnd() && *LineEnd != '\r' &&
|
|
*LineEnd != '\n')
|
|
++LineEnd;
|
|
|
|
StringRef Line(LineStart, LineEnd - LineStart);
|
|
if (Line.startswith(RulePrefix)) {
|
|
DidAllTestsPass &= check(Line.substr(RulePrefix.size()));
|
|
++NumRules;
|
|
}
|
|
|
|
// Eat whitespace.
|
|
LineStart = LineEnd;
|
|
while (LineStart != MemBuf->getBufferEnd() && std::isspace(*LineStart))
|
|
++LineStart;
|
|
}
|
|
return DidAllTestsPass && (NumRules != 0);
|
|
}
|
|
|
|
bool RuntimeDyldCheckerImpl::isSymbolValid(StringRef Symbol) const {
|
|
if (getRTDyld().getSymbol(Symbol))
|
|
return true;
|
|
return !!getRTDyld().Resolver.findSymbol(Symbol);
|
|
}
|
|
|
|
uint64_t RuntimeDyldCheckerImpl::getSymbolLocalAddr(StringRef Symbol) const {
|
|
return static_cast<uint64_t>(
|
|
reinterpret_cast<uintptr_t>(getRTDyld().getSymbolLocalAddress(Symbol)));
|
|
}
|
|
|
|
uint64_t RuntimeDyldCheckerImpl::getSymbolRemoteAddr(StringRef Symbol) const {
|
|
if (auto InternalSymbol = getRTDyld().getSymbol(Symbol))
|
|
return InternalSymbol.getAddress();
|
|
return getRTDyld().Resolver.findSymbol(Symbol).getAddress();
|
|
}
|
|
|
|
uint64_t RuntimeDyldCheckerImpl::readMemoryAtAddr(uint64_t SrcAddr,
|
|
unsigned Size) const {
|
|
uintptr_t PtrSizedAddr = static_cast<uintptr_t>(SrcAddr);
|
|
assert(PtrSizedAddr == SrcAddr && "Linker memory pointer out-of-range.");
|
|
uint8_t *Src = reinterpret_cast<uint8_t*>(PtrSizedAddr);
|
|
return getRTDyld().readBytesUnaligned(Src, Size);
|
|
}
|
|
|
|
|
|
std::pair<const RuntimeDyldCheckerImpl::SectionAddressInfo*, std::string>
|
|
RuntimeDyldCheckerImpl::findSectionAddrInfo(StringRef FileName,
|
|
StringRef SectionName) const {
|
|
|
|
auto SectionMapItr = Stubs.find(FileName);
|
|
if (SectionMapItr == Stubs.end()) {
|
|
std::string ErrorMsg = "File '";
|
|
ErrorMsg += FileName;
|
|
ErrorMsg += "' not found. ";
|
|
if (Stubs.empty())
|
|
ErrorMsg += "No stubs registered.";
|
|
else {
|
|
ErrorMsg += "Available files are:";
|
|
for (const auto& StubEntry : Stubs) {
|
|
ErrorMsg += " '";
|
|
ErrorMsg += StubEntry.first;
|
|
ErrorMsg += "'";
|
|
}
|
|
}
|
|
ErrorMsg += "\n";
|
|
return std::make_pair(nullptr, ErrorMsg);
|
|
}
|
|
|
|
auto SectionInfoItr = SectionMapItr->second.find(SectionName);
|
|
if (SectionInfoItr == SectionMapItr->second.end())
|
|
return std::make_pair(nullptr,
|
|
("Section '" + SectionName + "' not found in file '" +
|
|
FileName + "'\n").str());
|
|
|
|
return std::make_pair(&SectionInfoItr->second, std::string(""));
|
|
}
|
|
|
|
std::pair<uint64_t, std::string> RuntimeDyldCheckerImpl::getSectionAddr(
|
|
StringRef FileName, StringRef SectionName, bool IsInsideLoad) const {
|
|
|
|
const SectionAddressInfo *SectionInfo = nullptr;
|
|
{
|
|
std::string ErrorMsg;
|
|
std::tie(SectionInfo, ErrorMsg) =
|
|
findSectionAddrInfo(FileName, SectionName);
|
|
if (ErrorMsg != "")
|
|
return std::make_pair(0, ErrorMsg);
|
|
}
|
|
|
|
unsigned SectionID = SectionInfo->SectionID;
|
|
uint64_t Addr;
|
|
if (IsInsideLoad)
|
|
Addr = static_cast<uint64_t>(reinterpret_cast<uintptr_t>(
|
|
getRTDyld().Sections[SectionID].getAddress()));
|
|
else
|
|
Addr = getRTDyld().Sections[SectionID].getLoadAddress();
|
|
|
|
return std::make_pair(Addr, std::string(""));
|
|
}
|
|
|
|
std::pair<uint64_t, std::string> RuntimeDyldCheckerImpl::getStubAddrFor(
|
|
StringRef FileName, StringRef SectionName, StringRef SymbolName,
|
|
bool IsInsideLoad) const {
|
|
|
|
const SectionAddressInfo *SectionInfo = nullptr;
|
|
{
|
|
std::string ErrorMsg;
|
|
std::tie(SectionInfo, ErrorMsg) =
|
|
findSectionAddrInfo(FileName, SectionName);
|
|
if (ErrorMsg != "")
|
|
return std::make_pair(0, ErrorMsg);
|
|
}
|
|
|
|
unsigned SectionID = SectionInfo->SectionID;
|
|
const StubOffsetsMap &SymbolStubs = SectionInfo->StubOffsets;
|
|
auto StubOffsetItr = SymbolStubs.find(SymbolName);
|
|
if (StubOffsetItr == SymbolStubs.end())
|
|
return std::make_pair(0,
|
|
("Stub for symbol '" + SymbolName + "' not found. "
|
|
"If '" + SymbolName + "' is an internal symbol this "
|
|
"may indicate that the stub target offset is being "
|
|
"computed incorrectly.\n").str());
|
|
|
|
uint64_t StubOffset = StubOffsetItr->second;
|
|
|
|
uint64_t Addr;
|
|
if (IsInsideLoad) {
|
|
uintptr_t SectionBase = reinterpret_cast<uintptr_t>(
|
|
getRTDyld().Sections[SectionID].getAddress());
|
|
Addr = static_cast<uint64_t>(SectionBase) + StubOffset;
|
|
} else {
|
|
uint64_t SectionBase = getRTDyld().Sections[SectionID].getLoadAddress();
|
|
Addr = SectionBase + StubOffset;
|
|
}
|
|
|
|
return std::make_pair(Addr, std::string(""));
|
|
}
|
|
|
|
StringRef
|
|
RuntimeDyldCheckerImpl::getSubsectionStartingAt(StringRef Name) const {
|
|
RTDyldSymbolTable::const_iterator pos =
|
|
getRTDyld().GlobalSymbolTable.find(Name);
|
|
if (pos == getRTDyld().GlobalSymbolTable.end())
|
|
return StringRef();
|
|
const auto &SymInfo = pos->second;
|
|
uint8_t *SectionAddr = getRTDyld().getSectionAddress(SymInfo.getSectionID());
|
|
return StringRef(reinterpret_cast<const char *>(SectionAddr) +
|
|
SymInfo.getOffset(),
|
|
getRTDyld().Sections[SymInfo.getSectionID()].getSize() -
|
|
SymInfo.getOffset());
|
|
}
|
|
|
|
void RuntimeDyldCheckerImpl::registerSection(
|
|
StringRef FilePath, unsigned SectionID) {
|
|
StringRef FileName = sys::path::filename(FilePath);
|
|
const SectionEntry &Section = getRTDyld().Sections[SectionID];
|
|
StringRef SectionName = Section.getName();
|
|
|
|
Stubs[FileName][SectionName].SectionID = SectionID;
|
|
}
|
|
|
|
void RuntimeDyldCheckerImpl::registerStubMap(
|
|
StringRef FilePath, unsigned SectionID,
|
|
const RuntimeDyldImpl::StubMap &RTDyldStubs) {
|
|
StringRef FileName = sys::path::filename(FilePath);
|
|
const SectionEntry &Section = getRTDyld().Sections[SectionID];
|
|
StringRef SectionName = Section.getName();
|
|
|
|
Stubs[FileName][SectionName].SectionID = SectionID;
|
|
|
|
for (auto &StubMapEntry : RTDyldStubs) {
|
|
std::string SymbolName = "";
|
|
|
|
if (StubMapEntry.first.SymbolName)
|
|
SymbolName = StubMapEntry.first.SymbolName;
|
|
else {
|
|
// If this is a (Section, Offset) pair, do a reverse lookup in the
|
|
// global symbol table to find the name.
|
|
for (auto &GSTEntry : getRTDyld().GlobalSymbolTable) {
|
|
const auto &SymInfo = GSTEntry.second;
|
|
if (SymInfo.getSectionID() == StubMapEntry.first.SectionID &&
|
|
SymInfo.getOffset() ==
|
|
static_cast<uint64_t>(StubMapEntry.first.Offset)) {
|
|
SymbolName = GSTEntry.first();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (SymbolName != "")
|
|
Stubs[FileName][SectionName].StubOffsets[SymbolName] =
|
|
StubMapEntry.second;
|
|
}
|
|
}
|
|
|
|
RuntimeDyldChecker::RuntimeDyldChecker(RuntimeDyld &RTDyld,
|
|
MCDisassembler *Disassembler,
|
|
MCInstPrinter *InstPrinter,
|
|
raw_ostream &ErrStream)
|
|
: Impl(make_unique<RuntimeDyldCheckerImpl>(RTDyld, Disassembler,
|
|
InstPrinter, ErrStream)) {}
|
|
|
|
RuntimeDyldChecker::~RuntimeDyldChecker() {}
|
|
|
|
RuntimeDyld& RuntimeDyldChecker::getRTDyld() {
|
|
return Impl->RTDyld;
|
|
}
|
|
|
|
const RuntimeDyld& RuntimeDyldChecker::getRTDyld() const {
|
|
return Impl->RTDyld;
|
|
}
|
|
|
|
bool RuntimeDyldChecker::check(StringRef CheckExpr) const {
|
|
return Impl->check(CheckExpr);
|
|
}
|
|
|
|
bool RuntimeDyldChecker::checkAllRulesInBuffer(StringRef RulePrefix,
|
|
MemoryBuffer *MemBuf) const {
|
|
return Impl->checkAllRulesInBuffer(RulePrefix, MemBuf);
|
|
}
|
|
|
|
std::pair<uint64_t, std::string>
|
|
RuntimeDyldChecker::getSectionAddr(StringRef FileName, StringRef SectionName,
|
|
bool LocalAddress) {
|
|
return Impl->getSectionAddr(FileName, SectionName, LocalAddress);
|
|
}
|