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llvm-mirror/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
Lang Hames e759a41442 Make llvm-rtdlyd -check preserve automatic address mappings made by RuntimeDyld. 
Currently llvm-rtdyld in -check mode will map sections to back-to-back 4k
aligned slabs starting at 0x1000. Automatically remapping sections by default is
helpful because it quickly exposes relocation bugs due to use of local addresses
rather than load addresses (these would silently pass if the load address was
not remapped). These mappings can be explicitly overridden on a per-section
basis using llvm-rtdlyd's -map-section option. This patch extends this scheme to
also preserve any mappings made by RuntimeDyld itself. Preserving RuntimeDyld's
automatic mappings allows us to write test cases to verify that these automatic
mappings have been applied.

This will allow the fix in https://reviews.llvm.org/D32899 to be tested with
llvm-rtdyld -check.

llvm-svn: 302372
2017-05-07 17:19:53 +00:00

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//===--- RuntimeDyldChecker.cpp - RuntimeDyld tester framework --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/RuntimeDyldChecker.h"
#include "RuntimeDyldCheckerImpl.h"
#include "RuntimeDyldImpl.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/Path.h"
#include <cctype>
#include <memory>
#include <utility>
#define DEBUG_TYPE "rtdyld"
using namespace llvm;
namespace llvm {
// Helper class that implements the language evaluated by RuntimeDyldChecker.
class RuntimeDyldCheckerExprEval {
public:
RuntimeDyldCheckerExprEval(const RuntimeDyldCheckerImpl &Checker,
raw_ostream &ErrStream)
: Checker(Checker) {}
bool evaluate(StringRef Expr) const {
// Expect equality expression of the form 'LHS = RHS'.
Expr = Expr.trim();
size_t EQIdx = Expr.find('=');
ParseContext OutsideLoad(false);
// Evaluate LHS.
StringRef LHSExpr = Expr.substr(0, EQIdx).rtrim();
StringRef RemainingExpr;
EvalResult LHSResult;
std::tie(LHSResult, RemainingExpr) =
evalComplexExpr(evalSimpleExpr(LHSExpr, OutsideLoad), OutsideLoad);
if (LHSResult.hasError())
return handleError(Expr, LHSResult);
if (RemainingExpr != "")
return handleError(Expr, unexpectedToken(RemainingExpr, LHSExpr, ""));
// Evaluate RHS.
StringRef RHSExpr = Expr.substr(EQIdx + 1).ltrim();
EvalResult RHSResult;
std::tie(RHSResult, RemainingExpr) =
evalComplexExpr(evalSimpleExpr(RHSExpr, OutsideLoad), OutsideLoad);
if (RHSResult.hasError())
return handleError(Expr, RHSResult);
if (RemainingExpr != "")
return handleError(Expr, unexpectedToken(RemainingExpr, RHSExpr, ""));
if (LHSResult.getValue() != RHSResult.getValue()) {
Checker.ErrStream << "Expression '" << Expr << "' is false: "
<< format("0x%" PRIx64, LHSResult.getValue())
<< " != " << format("0x%" PRIx64, RHSResult.getValue())
<< "\n";
return false;
}
return true;
}
private:
// RuntimeDyldCheckerExprEval requires some context when parsing exprs. In
// particular, it needs to know whether a symbol is being evaluated in the
// context of a load, in which case we want the linker's local address for
// the symbol, or outside of a load, in which case we want the symbol's
// address in the remote target.
struct ParseContext {
bool IsInsideLoad;
ParseContext(bool IsInsideLoad) : IsInsideLoad(IsInsideLoad) {}
};
const RuntimeDyldCheckerImpl &Checker;
enum class BinOpToken : unsigned {
Invalid,
Add,
Sub,
BitwiseAnd,
BitwiseOr,
ShiftLeft,
ShiftRight
};
class EvalResult {
public:
EvalResult() : Value(0), ErrorMsg("") {}
EvalResult(uint64_t Value) : Value(Value), ErrorMsg("") {}
EvalResult(std::string ErrorMsg)
: Value(0), ErrorMsg(std::move(ErrorMsg)) {}
uint64_t getValue() const { return Value; }
bool hasError() const { return ErrorMsg != ""; }
const std::string &getErrorMsg() const { return ErrorMsg; }
private:
uint64_t Value;
std::string ErrorMsg;
};
StringRef getTokenForError(StringRef Expr) const {
if (Expr.empty())
return "";
StringRef Token, Remaining;
if (isalpha(Expr[0]))
std::tie(Token, Remaining) = parseSymbol(Expr);
else if (isdigit(Expr[0]))
std::tie(Token, Remaining) = parseNumberString(Expr);
else {
unsigned TokLen = 1;
if (Expr.startswith("<<") || Expr.startswith(">>"))
TokLen = 2;
Token = Expr.substr(0, TokLen);
}
return Token;
}
EvalResult unexpectedToken(StringRef TokenStart, StringRef SubExpr,
StringRef ErrText) const {
std::string ErrorMsg("Encountered unexpected token '");
ErrorMsg += getTokenForError(TokenStart);
if (SubExpr != "") {
ErrorMsg += "' while parsing subexpression '";
ErrorMsg += SubExpr;
}
ErrorMsg += "'";
if (ErrText != "") {
ErrorMsg += " ";
ErrorMsg += ErrText;
}
return EvalResult(std::move(ErrorMsg));
}
bool handleError(StringRef Expr, const EvalResult &R) const {
assert(R.hasError() && "Not an error result.");
Checker.ErrStream << "Error evaluating expression '" << Expr
<< "': " << R.getErrorMsg() << "\n";
return false;
}
std::pair<BinOpToken, StringRef> parseBinOpToken(StringRef Expr) const {
if (Expr.empty())
return std::make_pair(BinOpToken::Invalid, "");
// Handle the two 2-character tokens.
if (Expr.startswith("<<"))
return std::make_pair(BinOpToken::ShiftLeft, Expr.substr(2).ltrim());
if (Expr.startswith(">>"))
return std::make_pair(BinOpToken::ShiftRight, Expr.substr(2).ltrim());
// Handle one-character tokens.
BinOpToken Op;
switch (Expr[0]) {
default:
return std::make_pair(BinOpToken::Invalid, Expr);
case '+':
Op = BinOpToken::Add;
break;
case '-':
Op = BinOpToken::Sub;
break;
case '&':
Op = BinOpToken::BitwiseAnd;
break;
case '|':
Op = BinOpToken::BitwiseOr;
break;
}
return std::make_pair(Op, Expr.substr(1).ltrim());
}
EvalResult computeBinOpResult(BinOpToken Op, const EvalResult &LHSResult,
const EvalResult &RHSResult) const {
switch (Op) {
default:
llvm_unreachable("Tried to evaluate unrecognized operation.");
case BinOpToken::Add:
return EvalResult(LHSResult.getValue() + RHSResult.getValue());
case BinOpToken::Sub:
return EvalResult(LHSResult.getValue() - RHSResult.getValue());
case BinOpToken::BitwiseAnd:
return EvalResult(LHSResult.getValue() & RHSResult.getValue());
case BinOpToken::BitwiseOr:
return EvalResult(LHSResult.getValue() | RHSResult.getValue());
case BinOpToken::ShiftLeft:
return EvalResult(LHSResult.getValue() << RHSResult.getValue());
case BinOpToken::ShiftRight:
return EvalResult(LHSResult.getValue() >> RHSResult.getValue());
}
}
// Parse a symbol and return a (string, string) pair representing the symbol
// name and expression remaining to be parsed.
std::pair<StringRef, StringRef> parseSymbol(StringRef Expr) const {
size_t FirstNonSymbol = Expr.find_first_not_of("0123456789"
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
":_.$");
return std::make_pair(Expr.substr(0, FirstNonSymbol),
Expr.substr(FirstNonSymbol).ltrim());
}
// Evaluate a call to decode_operand. Decode the instruction operand at the
// given symbol and get the value of the requested operand.
// Returns an error if the instruction cannot be decoded, or the requested
// operand is not an immediate.
// On success, returns a pair containing the value of the operand, plus
// the expression remaining to be evaluated.
std::pair<EvalResult, StringRef> evalDecodeOperand(StringRef Expr) const {
if (!Expr.startswith("("))
return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
StringRef RemainingExpr = Expr.substr(1).ltrim();
StringRef Symbol;
std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr);
if (!Checker.isSymbolValid(Symbol))
return std::make_pair(
EvalResult(("Cannot decode unknown symbol '" + Symbol + "'").str()),
"");
if (!RemainingExpr.startswith(","))
return std::make_pair(
unexpectedToken(RemainingExpr, RemainingExpr, "expected ','"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
EvalResult OpIdxExpr;
std::tie(OpIdxExpr, RemainingExpr) = evalNumberExpr(RemainingExpr);
if (OpIdxExpr.hasError())
return std::make_pair(OpIdxExpr, "");
if (!RemainingExpr.startswith(")"))
return std::make_pair(
unexpectedToken(RemainingExpr, RemainingExpr, "expected ')'"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
MCInst Inst;
uint64_t Size;
if (!decodeInst(Symbol, Inst, Size))
return std::make_pair(
EvalResult(("Couldn't decode instruction at '" + Symbol + "'").str()),
"");
unsigned OpIdx = OpIdxExpr.getValue();
if (OpIdx >= Inst.getNumOperands()) {
std::string ErrMsg;
raw_string_ostream ErrMsgStream(ErrMsg);
ErrMsgStream << "Invalid operand index '" << format("%i", OpIdx)
<< "' for instruction '" << Symbol
<< "'. Instruction has only "
<< format("%i", Inst.getNumOperands())
<< " operands.\nInstruction is:\n ";
Inst.dump_pretty(ErrMsgStream, Checker.InstPrinter);
return std::make_pair(EvalResult(ErrMsgStream.str()), "");
}
const MCOperand &Op = Inst.getOperand(OpIdx);
if (!Op.isImm()) {
std::string ErrMsg;
raw_string_ostream ErrMsgStream(ErrMsg);
ErrMsgStream << "Operand '" << format("%i", OpIdx) << "' of instruction '"
<< Symbol << "' is not an immediate.\nInstruction is:\n ";
Inst.dump_pretty(ErrMsgStream, Checker.InstPrinter);
return std::make_pair(EvalResult(ErrMsgStream.str()), "");
}
return std::make_pair(EvalResult(Op.getImm()), RemainingExpr);
}
// Evaluate a call to next_pc.
// Decode the instruction at the given symbol and return the following program
// counter.
// Returns an error if the instruction cannot be decoded.
// On success, returns a pair containing the next PC, plus of the
// expression remaining to be evaluated.
std::pair<EvalResult, StringRef> evalNextPC(StringRef Expr,
ParseContext PCtx) const {
if (!Expr.startswith("("))
return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
StringRef RemainingExpr = Expr.substr(1).ltrim();
StringRef Symbol;
std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr);
if (!Checker.isSymbolValid(Symbol))
return std::make_pair(
EvalResult(("Cannot decode unknown symbol '" + Symbol + "'").str()),
"");
if (!RemainingExpr.startswith(")"))
return std::make_pair(
unexpectedToken(RemainingExpr, RemainingExpr, "expected ')'"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
MCInst Inst;
uint64_t InstSize;
if (!decodeInst(Symbol, Inst, InstSize))
return std::make_pair(
EvalResult(("Couldn't decode instruction at '" + Symbol + "'").str()),
"");
uint64_t SymbolAddr = PCtx.IsInsideLoad
? Checker.getSymbolLocalAddr(Symbol)
: Checker.getSymbolRemoteAddr(Symbol);
uint64_t NextPC = SymbolAddr + InstSize;
return std::make_pair(EvalResult(NextPC), RemainingExpr);
}
// Evaluate a call to stub_addr.
// Look up and return the address of the stub for the given
// (<file name>, <section name>, <symbol name>) tuple.
// On success, returns a pair containing the stub address, plus the expression
// remaining to be evaluated.
std::pair<EvalResult, StringRef> evalStubAddr(StringRef Expr,
ParseContext PCtx) const {
if (!Expr.startswith("("))
return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
StringRef RemainingExpr = Expr.substr(1).ltrim();
// Handle file-name specially, as it may contain characters that aren't
// legal for symbols.
StringRef FileName;
size_t ComaIdx = RemainingExpr.find(',');
FileName = RemainingExpr.substr(0, ComaIdx).rtrim();
RemainingExpr = RemainingExpr.substr(ComaIdx).ltrim();
if (!RemainingExpr.startswith(","))
return std::make_pair(
unexpectedToken(RemainingExpr, Expr, "expected ','"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
StringRef SectionName;
std::tie(SectionName, RemainingExpr) = parseSymbol(RemainingExpr);
if (!RemainingExpr.startswith(","))
return std::make_pair(
unexpectedToken(RemainingExpr, Expr, "expected ','"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
StringRef Symbol;
std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr);
if (!RemainingExpr.startswith(")"))
return std::make_pair(
unexpectedToken(RemainingExpr, Expr, "expected ')'"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
uint64_t StubAddr;
std::string ErrorMsg = "";
std::tie(StubAddr, ErrorMsg) = Checker.getStubAddrFor(
FileName, SectionName, Symbol, PCtx.IsInsideLoad);
if (ErrorMsg != "")
return std::make_pair(EvalResult(ErrorMsg), "");
return std::make_pair(EvalResult(StubAddr), RemainingExpr);
}
std::pair<EvalResult, StringRef> evalSectionAddr(StringRef Expr,
ParseContext PCtx) const {
if (!Expr.startswith("("))
return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), "");
StringRef RemainingExpr = Expr.substr(1).ltrim();
// Handle file-name specially, as it may contain characters that aren't
// legal for symbols.
StringRef FileName;
size_t ComaIdx = RemainingExpr.find(',');
FileName = RemainingExpr.substr(0, ComaIdx).rtrim();
RemainingExpr = RemainingExpr.substr(ComaIdx).ltrim();
if (!RemainingExpr.startswith(","))
return std::make_pair(
unexpectedToken(RemainingExpr, Expr, "expected ','"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
StringRef SectionName;
std::tie(SectionName, RemainingExpr) = parseSymbol(RemainingExpr);
if (!RemainingExpr.startswith(")"))
return std::make_pair(
unexpectedToken(RemainingExpr, Expr, "expected ')'"), "");
RemainingExpr = RemainingExpr.substr(1).ltrim();
uint64_t StubAddr;
std::string ErrorMsg = "";
std::tie(StubAddr, ErrorMsg) = Checker.getSectionAddr(
FileName, SectionName, PCtx.IsInsideLoad);
if (ErrorMsg != "")
return std::make_pair(EvalResult(ErrorMsg), "");
return std::make_pair(EvalResult(StubAddr), RemainingExpr);
}
// Evaluate an identiefer expr, which may be a symbol, or a call to
// one of the builtin functions: get_insn_opcode or get_insn_length.
// Return the result, plus the expression remaining to be parsed.
std::pair<EvalResult, StringRef> evalIdentifierExpr(StringRef Expr,
ParseContext PCtx) const {
StringRef Symbol;
StringRef RemainingExpr;
std::tie(Symbol, RemainingExpr) = parseSymbol(Expr);
// Check for builtin function calls.
if (Symbol == "decode_operand")
return evalDecodeOperand(RemainingExpr);
else if (Symbol == "next_pc")
return evalNextPC(RemainingExpr, PCtx);
else if (Symbol == "stub_addr")
return evalStubAddr(RemainingExpr, PCtx);
else if (Symbol == "section_addr")
return evalSectionAddr(RemainingExpr, PCtx);
if (!Checker.isSymbolValid(Symbol)) {
std::string ErrMsg("No known address for symbol '");
ErrMsg += Symbol;
ErrMsg += "'";
if (Symbol.startswith("L"))
ErrMsg += " (this appears to be an assembler local label - "
" perhaps drop the 'L'?)";
return std::make_pair(EvalResult(ErrMsg), "");
}
// The value for the symbol depends on the context we're evaluating in:
// Inside a load this is the address in the linker's memory, outside a
// load it's the address in the target processes memory.
uint64_t Value = PCtx.IsInsideLoad ? Checker.getSymbolLocalAddr(Symbol)
: Checker.getSymbolRemoteAddr(Symbol);
// Looks like a plain symbol reference.
return std::make_pair(EvalResult(Value), RemainingExpr);
}
// Parse a number (hexadecimal or decimal) and return a (string, string)
// pair representing the number and the expression remaining to be parsed.
std::pair<StringRef, StringRef> parseNumberString(StringRef Expr) const {
size_t FirstNonDigit = StringRef::npos;
if (Expr.startswith("0x")) {
FirstNonDigit = Expr.find_first_not_of("0123456789abcdefABCDEF", 2);
if (FirstNonDigit == StringRef::npos)
FirstNonDigit = Expr.size();
} else {
FirstNonDigit = Expr.find_first_not_of("0123456789");
if (FirstNonDigit == StringRef::npos)
FirstNonDigit = Expr.size();
}
return std::make_pair(Expr.substr(0, FirstNonDigit),
Expr.substr(FirstNonDigit));
}
// Evaluate a constant numeric expression (hexadecimal or decimal) and
// return a pair containing the result, and the expression remaining to be
// evaluated.
std::pair<EvalResult, StringRef> evalNumberExpr(StringRef Expr) const {
StringRef ValueStr;
StringRef RemainingExpr;
std::tie(ValueStr, RemainingExpr) = parseNumberString(Expr);
if (ValueStr.empty() || !isdigit(ValueStr[0]))
return std::make_pair(
unexpectedToken(RemainingExpr, RemainingExpr, "expected number"), "");
uint64_t Value;
ValueStr.getAsInteger(0, Value);
return std::make_pair(EvalResult(Value), RemainingExpr);
}
// 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());
}
Optional<uint64_t>
RuntimeDyldCheckerImpl::getSectionLoadAddress(void *LocalAddress) const {
for (auto &S : getRTDyld().Sections) {
if (S.getAddress() == LocalAddress)
return S.getLoadAddress();
}
return Optional<uint64_t>();
}
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);
}
Optional<uint64_t>
RuntimeDyldChecker::getSectionLoadAddress(void *LocalAddress) const {
return Impl->getSectionLoadAddress(LocalAddress);
}
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