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Runtime.cpp
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Runtime.cpp
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// This file is part of SymCC.
//
// SymCC is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// SymCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// SymCC. If not, see <https://www.gnu.org/licenses/>.
#include "Runtime.h"
#include <llvm/ADT/StringSet.h>
#include <llvm/Config/llvm-config.h>
#include <llvm/IR/IRBuilder.h>
using namespace llvm;
namespace {
template <typename... ArgsTy>
SymFnT import(llvm::Module &M, llvm::StringRef name, llvm::Type *ret,
ArgsTy... args) {
#if LLVM_VERSION_MAJOR >= 9 && LLVM_VERSION_MAJOR < 11
return M.getOrInsertFunction(name, ret, args...).getCallee();
#else
return M.getOrInsertFunction(name, ret, args...);
#endif
}
} // namespace
Runtime::Runtime(Module &M) {
IRBuilder<> IRB(M.getContext());
auto *intPtrType = M.getDataLayout().getIntPtrType(M.getContext());
auto *ptrT = IRB.getInt8Ty()->getPointerTo();
auto *int8T = IRB.getInt8Ty();
auto *int1T = IRB.getInt1Ty();
auto *voidT = IRB.getVoidTy();
buildInteger = import(M, "_sym_build_integer", ptrT, IRB.getInt64Ty(), int8T);
buildInteger128 = import(M, "_sym_build_integer128", ptrT, IRB.getInt64Ty(),
IRB.getInt64Ty());
buildFloat = import(M, "_sym_build_float", ptrT, IRB.getDoubleTy(), int1T);
buildNullPointer = import(M, "_sym_build_null_pointer", ptrT);
buildTrue = import(M, "_sym_build_true", ptrT);
buildFalse = import(M, "_sym_build_false", ptrT);
buildBool = import(M, "_sym_build_bool", ptrT, int1T);
buildSExt = import(M, "_sym_build_sext", ptrT, ptrT, int8T);
buildZExt = import(M, "_sym_build_zext", ptrT, ptrT, int8T);
buildTrunc = import(M, "_sym_build_trunc", ptrT, ptrT, int8T);
buildBswap = import(M, "_sym_build_bswap", ptrT, ptrT);
buildIntToFloat =
import(M, "_sym_build_int_to_float", ptrT, ptrT, int1T, int1T);
buildFloatToFloat = import(M, "_sym_build_float_to_float", ptrT, ptrT, int1T);
buildBitsToFloat = import(M, "_sym_build_bits_to_float", ptrT, ptrT, int1T);
buildFloatToBits = import(M, "_sym_build_float_to_bits", ptrT, ptrT);
buildFloatToSignedInt =
import(M, "_sym_build_float_to_signed_integer", ptrT, ptrT, int8T);
buildFloatToUnsignedInt =
import(M, "_sym_build_float_to_unsigned_integer", ptrT, ptrT, int8T);
buildFloatAbs = import(M, "_sym_build_fp_abs", ptrT, ptrT);
buildBoolAnd = import(M, "_sym_build_bool_and", ptrT, ptrT, ptrT);
buildBoolOr = import(M, "_sym_build_bool_or", ptrT, ptrT, ptrT);
buildBoolXor = import(M, "_sym_build_bool_xor", ptrT, ptrT, ptrT);
buildBoolToBit = import(M, "_sym_build_bool_to_bit", ptrT, ptrT);
buildBitToBool = import(M, "_sym_build_bit_to_bool", ptrT, ptrT);
buildConcat =
import(M, "_sym_concat_helper", ptrT, ptrT,
ptrT); // doesn't follow naming convention for historic reasons
pushPathConstraint =
import(M, "_sym_push_path_constraint", voidT, ptrT, int1T, intPtrType);
// Overflow arithmetic
buildAddOverflow =
import(M, "_sym_build_add_overflow", ptrT, ptrT, ptrT, int1T, int1T);
buildSubOverflow =
import(M, "_sym_build_sub_overflow", ptrT, ptrT, ptrT, int1T, int1T);
buildMulOverflow =
import(M, "_sym_build_mul_overflow", ptrT, ptrT, ptrT, int1T, int1T);
// Saturating arithmetic
buildSAddSat = import(M, "_sym_build_sadd_sat", ptrT, ptrT, ptrT);
buildUAddSat = import(M, "_sym_build_uadd_sat", ptrT, ptrT, ptrT);
buildSSubSat = import(M, "_sym_build_ssub_sat", ptrT, ptrT, ptrT);
buildUSubSat = import(M, "_sym_build_usub_sat", ptrT, ptrT, ptrT);
buildSShlSat = import(M, "_sym_build_sshl_sat", ptrT, ptrT, ptrT);
buildUShlSat = import(M, "_sym_build_ushl_sat", ptrT, ptrT, ptrT);
buildFshl = import(M, "_sym_build_funnel_shift_left", ptrT, ptrT, ptrT, ptrT);
buildFshr =
import(M, "_sym_build_funnel_shift_right", ptrT, ptrT, ptrT, ptrT);
buildAbs = import(M, "_sym_build_abs", ptrT, ptrT);
setParameterExpression =
import(M, "_sym_set_parameter_expression", voidT, int8T, ptrT);
getParameterExpression =
import(M, "_sym_get_parameter_expression", ptrT, int8T);
setReturnExpression = import(M, "_sym_set_return_expression", voidT, ptrT);
getReturnExpression = import(M, "_sym_get_return_expression", ptrT);
#define LOAD_BINARY_OPERATOR_HANDLER(constant, name) \
binaryOperatorHandlers[Instruction::constant] = \
import(M, "_sym_build_" #name, ptrT, ptrT, ptrT);
LOAD_BINARY_OPERATOR_HANDLER(Add, add)
LOAD_BINARY_OPERATOR_HANDLER(Sub, sub)
LOAD_BINARY_OPERATOR_HANDLER(Mul, mul)
LOAD_BINARY_OPERATOR_HANDLER(UDiv, unsigned_div)
LOAD_BINARY_OPERATOR_HANDLER(SDiv, signed_div)
LOAD_BINARY_OPERATOR_HANDLER(URem, unsigned_rem)
LOAD_BINARY_OPERATOR_HANDLER(SRem, signed_rem)
LOAD_BINARY_OPERATOR_HANDLER(Shl, shift_left)
LOAD_BINARY_OPERATOR_HANDLER(LShr, logical_shift_right)
LOAD_BINARY_OPERATOR_HANDLER(AShr, arithmetic_shift_right)
LOAD_BINARY_OPERATOR_HANDLER(And, and)
LOAD_BINARY_OPERATOR_HANDLER(Or, or)
LOAD_BINARY_OPERATOR_HANDLER(Xor, xor)
// Floating-point arithmetic
LOAD_BINARY_OPERATOR_HANDLER(FAdd, fp_add)
LOAD_BINARY_OPERATOR_HANDLER(FSub, fp_sub)
LOAD_BINARY_OPERATOR_HANDLER(FMul, fp_mul)
LOAD_BINARY_OPERATOR_HANDLER(FDiv, fp_div)
LOAD_BINARY_OPERATOR_HANDLER(FRem, fp_rem)
#undef LOAD_BINARY_OPERATOR_HANDLER
#define LOAD_UNARY_OPERATOR_HANDLER(constant, name) \
unaryOperatorHandlers[Instruction::constant] = \
import(M, "_sym_build_" #name, ptrT, ptrT);
LOAD_UNARY_OPERATOR_HANDLER(FNeg, fp_neg)
#undef LOAD_UNARY_OPERATOR_HANDLER
#define LOAD_COMPARISON_HANDLER(constant, name) \
comparisonHandlers[CmpInst::constant] = \
import(M, "_sym_build_" #name, ptrT, ptrT, ptrT);
LOAD_COMPARISON_HANDLER(ICMP_EQ, equal)
LOAD_COMPARISON_HANDLER(ICMP_NE, not_equal)
LOAD_COMPARISON_HANDLER(ICMP_UGT, unsigned_greater_than)
LOAD_COMPARISON_HANDLER(ICMP_UGE, unsigned_greater_equal)
LOAD_COMPARISON_HANDLER(ICMP_ULT, unsigned_less_than)
LOAD_COMPARISON_HANDLER(ICMP_ULE, unsigned_less_equal)
LOAD_COMPARISON_HANDLER(ICMP_SGT, signed_greater_than)
LOAD_COMPARISON_HANDLER(ICMP_SGE, signed_greater_equal)
LOAD_COMPARISON_HANDLER(ICMP_SLT, signed_less_than)
LOAD_COMPARISON_HANDLER(ICMP_SLE, signed_less_equal)
// Floating-point comparisons
LOAD_COMPARISON_HANDLER(FCMP_OGT, float_ordered_greater_than)
LOAD_COMPARISON_HANDLER(FCMP_OGE, float_ordered_greater_equal)
LOAD_COMPARISON_HANDLER(FCMP_OLT, float_ordered_less_than)
LOAD_COMPARISON_HANDLER(FCMP_OLE, float_ordered_less_equal)
LOAD_COMPARISON_HANDLER(FCMP_OEQ, float_ordered_equal)
LOAD_COMPARISON_HANDLER(FCMP_ONE, float_ordered_not_equal)
LOAD_COMPARISON_HANDLER(FCMP_ORD, float_ordered)
LOAD_COMPARISON_HANDLER(FCMP_UNO, float_unordered)
LOAD_COMPARISON_HANDLER(FCMP_UGT, float_unordered_greater_than)
LOAD_COMPARISON_HANDLER(FCMP_UGE, float_unordered_greater_equal)
LOAD_COMPARISON_HANDLER(FCMP_ULT, float_unordered_less_than)
LOAD_COMPARISON_HANDLER(FCMP_ULE, float_unordered_less_equal)
LOAD_COMPARISON_HANDLER(FCMP_UEQ, float_unordered_equal)
LOAD_COMPARISON_HANDLER(FCMP_UNE, float_unordered_not_equal)
#undef LOAD_COMPARISON_HANDLER
memcpy = import(M, "_sym_memcpy", voidT, ptrT, ptrT, intPtrType);
memset = import(M, "_sym_memset", voidT, ptrT, ptrT, intPtrType);
memmove = import(M, "_sym_memmove", voidT, ptrT, ptrT, intPtrType);
readMemory =
import(M, "_sym_read_memory", ptrT, intPtrType, intPtrType, int1T);
writeMemory = import(M, "_sym_write_memory", voidT, intPtrType, intPtrType,
ptrT, int1T);
buildZeroBytes = import(M, "_sym_build_zero_bytes", ptrT, intPtrType);
buildInsert =
import(M, "_sym_build_insert", ptrT, ptrT, ptrT, IRB.getInt64Ty(), int1T);
buildExtract = import(M, "_sym_build_extract", ptrT, ptrT, IRB.getInt64Ty(),
IRB.getInt64Ty(), int1T);
notifyCall = import(M, "_sym_notify_call", voidT, intPtrType);
notifyRet = import(M, "_sym_notify_ret", voidT, intPtrType);
notifyBasicBlock = import(M, "_sym_notify_basic_block", voidT, intPtrType);
}
/// Decide whether a function is called symbolically.
bool isInterceptedFunction(const Function &f) {
static const StringSet<> kInterceptedFunctions = {
"malloc", "calloc", "mmap", "mmap64", "open", "read",
"lseek", "lseek64", "fopen", "fopen64", "fread", "fseek",
"fseeko", "rewind", "fseeko64", "getc", "ungetc", "memcpy",
"memset", "strncpy", "strchr", "memcmp", "memmove", "ntohl",
"fgets", "fgetc", "getchar", "bcopy", "bcmp", "bzero"};
return (kInterceptedFunctions.count(f.getName()) > 0);
}