mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33710 91177308-0d34-0410-b5e6-96231b3b80d8
2084 lines
73 KiB
C++
2084 lines
73 KiB
C++
//===- Reader.cpp - Code to read bytecode files ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This library implements the functionality defined in llvm/Bytecode/Reader.h
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//
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// Note that this library should be as fast as possible, reentrant, and
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// threadsafe!!
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//
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// TODO: Allow passing in an option to ignore the symbol table
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//
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//===----------------------------------------------------------------------===//
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#include "Reader.h"
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#include "llvm/Bytecode/BytecodeHandler.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Constants.h"
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#include "llvm/InlineAsm.h"
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#include "llvm/Instructions.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/TypeSymbolTable.h"
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#include "llvm/Bytecode/Format.h"
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#include "llvm/Config/alloca.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/Compressor.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include <sstream>
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#include <algorithm>
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using namespace llvm;
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namespace {
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/// @brief A class for maintaining the slot number definition
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/// as a placeholder for the actual definition for forward constants defs.
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class ConstantPlaceHolder : public ConstantExpr {
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ConstantPlaceHolder(); // DO NOT IMPLEMENT
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void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
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public:
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Use Op;
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ConstantPlaceHolder(const Type *Ty)
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: ConstantExpr(Ty, Instruction::UserOp1, &Op, 1),
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Op(UndefValue::get(Type::Int32Ty), this) {
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}
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};
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}
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// Provide some details on error
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inline void BytecodeReader::error(const std::string& err) {
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ErrorMsg = err + " (Vers=" + itostr(RevisionNum) + ", Pos="
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+ itostr(At-MemStart) + ")";
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longjmp(context,1);
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}
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//===----------------------------------------------------------------------===//
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// Bytecode Reading Methods
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//===----------------------------------------------------------------------===//
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/// Determine if the current block being read contains any more data.
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inline bool BytecodeReader::moreInBlock() {
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return At < BlockEnd;
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}
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/// Throw an error if we've read past the end of the current block
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inline void BytecodeReader::checkPastBlockEnd(const char * block_name) {
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if (At > BlockEnd)
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error(std::string("Attempt to read past the end of ") + block_name +
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" block.");
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}
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/// Read a whole unsigned integer
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inline unsigned BytecodeReader::read_uint() {
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if (At+4 > BlockEnd)
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error("Ran out of data reading uint!");
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At += 4;
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return At[-4] | (At[-3] << 8) | (At[-2] << 16) | (At[-1] << 24);
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}
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/// Read a variable-bit-rate encoded unsigned integer
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inline unsigned BytecodeReader::read_vbr_uint() {
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unsigned Shift = 0;
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unsigned Result = 0;
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BufPtr Save = At;
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do {
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if (At == BlockEnd)
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error("Ran out of data reading vbr_uint!");
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Result |= (unsigned)((*At++) & 0x7F) << Shift;
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Shift += 7;
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} while (At[-1] & 0x80);
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if (Handler) Handler->handleVBR32(At-Save);
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return Result;
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}
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/// Read a variable-bit-rate encoded unsigned 64-bit integer.
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inline uint64_t BytecodeReader::read_vbr_uint64() {
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unsigned Shift = 0;
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uint64_t Result = 0;
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BufPtr Save = At;
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do {
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if (At == BlockEnd)
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error("Ran out of data reading vbr_uint64!");
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Result |= (uint64_t)((*At++) & 0x7F) << Shift;
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Shift += 7;
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} while (At[-1] & 0x80);
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if (Handler) Handler->handleVBR64(At-Save);
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return Result;
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}
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/// Read a variable-bit-rate encoded signed 64-bit integer.
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inline int64_t BytecodeReader::read_vbr_int64() {
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uint64_t R = read_vbr_uint64();
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if (R & 1) {
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if (R != 1)
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return -(int64_t)(R >> 1);
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else // There is no such thing as -0 with integers. "-0" really means
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// 0x8000000000000000.
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return 1LL << 63;
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} else
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return (int64_t)(R >> 1);
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}
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/// Read a pascal-style string (length followed by text)
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inline std::string BytecodeReader::read_str() {
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unsigned Size = read_vbr_uint();
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const unsigned char *OldAt = At;
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At += Size;
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if (At > BlockEnd) // Size invalid?
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error("Ran out of data reading a string!");
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return std::string((char*)OldAt, Size);
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}
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/// Read an arbitrary block of data
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inline void BytecodeReader::read_data(void *Ptr, void *End) {
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unsigned char *Start = (unsigned char *)Ptr;
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unsigned Amount = (unsigned char *)End - Start;
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if (At+Amount > BlockEnd)
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error("Ran out of data!");
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std::copy(At, At+Amount, Start);
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At += Amount;
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}
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/// Read a float value in little-endian order
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inline void BytecodeReader::read_float(float& FloatVal) {
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/// FIXME: This isn't optimal, it has size problems on some platforms
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/// where FP is not IEEE.
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FloatVal = BitsToFloat(At[0] | (At[1] << 8) | (At[2] << 16) | (At[3] << 24));
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At+=sizeof(uint32_t);
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}
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/// Read a double value in little-endian order
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inline void BytecodeReader::read_double(double& DoubleVal) {
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/// FIXME: This isn't optimal, it has size problems on some platforms
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/// where FP is not IEEE.
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DoubleVal = BitsToDouble((uint64_t(At[0]) << 0) | (uint64_t(At[1]) << 8) |
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(uint64_t(At[2]) << 16) | (uint64_t(At[3]) << 24) |
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(uint64_t(At[4]) << 32) | (uint64_t(At[5]) << 40) |
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(uint64_t(At[6]) << 48) | (uint64_t(At[7]) << 56));
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At+=sizeof(uint64_t);
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}
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/// Read a block header and obtain its type and size
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inline void BytecodeReader::read_block(unsigned &Type, unsigned &Size) {
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Size = read_uint(); // Read the header
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Type = Size & 0x1F; // mask low order five bits to get type
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Size >>= 5; // high order 27 bits is the size
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BlockStart = At;
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if (At + Size > BlockEnd)
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error("Attempt to size a block past end of memory");
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BlockEnd = At + Size;
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if (Handler) Handler->handleBlock(Type, BlockStart, Size);
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}
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//===----------------------------------------------------------------------===//
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// IR Lookup Methods
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//===----------------------------------------------------------------------===//
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/// Determine if a type id has an implicit null value
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inline bool BytecodeReader::hasImplicitNull(unsigned TyID) {
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return TyID != Type::LabelTyID && TyID != Type::VoidTyID;
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}
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/// Obtain a type given a typeid and account for things like function level vs
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/// module level, and the offsetting for the primitive types.
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const Type *BytecodeReader::getType(unsigned ID) {
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if (ID <= Type::LastPrimitiveTyID)
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if (const Type *T = Type::getPrimitiveType((Type::TypeID)ID))
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return T; // Asked for a primitive type...
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// Otherwise, derived types need offset...
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ID -= Type::FirstDerivedTyID;
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// Is it a module-level type?
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if (ID < ModuleTypes.size())
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return ModuleTypes[ID].get();
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// Nope, is it a function-level type?
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ID -= ModuleTypes.size();
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if (ID < FunctionTypes.size())
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return FunctionTypes[ID].get();
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error("Illegal type reference!");
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return Type::VoidTy;
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}
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/// This method just saves some coding. It uses read_vbr_uint to read in a
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/// type id, errors that its not the type type, and then calls getType to
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/// return the type value.
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inline const Type* BytecodeReader::readType() {
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return getType(read_vbr_uint());
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}
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/// Get the slot number associated with a type accounting for primitive
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/// types and function level vs module level.
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unsigned BytecodeReader::getTypeSlot(const Type *Ty) {
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if (Ty->isPrimitiveType())
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return Ty->getTypeID();
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// Check the function level types first...
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TypeListTy::iterator I = std::find(FunctionTypes.begin(),
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FunctionTypes.end(), Ty);
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if (I != FunctionTypes.end())
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return Type::FirstDerivedTyID + ModuleTypes.size() +
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(&*I - &FunctionTypes[0]);
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// If we don't have our cache yet, build it now.
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if (ModuleTypeIDCache.empty()) {
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unsigned N = 0;
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ModuleTypeIDCache.reserve(ModuleTypes.size());
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for (TypeListTy::iterator I = ModuleTypes.begin(), E = ModuleTypes.end();
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I != E; ++I, ++N)
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ModuleTypeIDCache.push_back(std::make_pair(*I, N));
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std::sort(ModuleTypeIDCache.begin(), ModuleTypeIDCache.end());
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}
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// Binary search the cache for the entry.
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std::vector<std::pair<const Type*, unsigned> >::iterator IT =
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std::lower_bound(ModuleTypeIDCache.begin(), ModuleTypeIDCache.end(),
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std::make_pair(Ty, 0U));
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if (IT == ModuleTypeIDCache.end() || IT->first != Ty)
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error("Didn't find type in ModuleTypes.");
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return Type::FirstDerivedTyID + IT->second;
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}
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/// Retrieve a value of a given type and slot number, possibly creating
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/// it if it doesn't already exist.
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Value * BytecodeReader::getValue(unsigned type, unsigned oNum, bool Create) {
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assert(type != Type::LabelTyID && "getValue() cannot get blocks!");
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unsigned Num = oNum;
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// By default, the global type id is the type id passed in
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unsigned GlobalTyID = type;
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if (hasImplicitNull(GlobalTyID)) {
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const Type *Ty = getType(type);
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if (!isa<OpaqueType>(Ty)) {
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if (Num == 0)
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return Constant::getNullValue(Ty);
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--Num;
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}
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}
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if (GlobalTyID < ModuleValues.size() && ModuleValues[GlobalTyID]) {
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if (Num < ModuleValues[GlobalTyID]->size())
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return ModuleValues[GlobalTyID]->getOperand(Num);
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Num -= ModuleValues[GlobalTyID]->size();
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}
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if (FunctionValues.size() > type &&
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FunctionValues[type] &&
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Num < FunctionValues[type]->size())
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return FunctionValues[type]->getOperand(Num);
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if (!Create) return 0; // Do not create a placeholder?
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// Did we already create a place holder?
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std::pair<unsigned,unsigned> KeyValue(type, oNum);
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ForwardReferenceMap::iterator I = ForwardReferences.lower_bound(KeyValue);
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if (I != ForwardReferences.end() && I->first == KeyValue)
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return I->second; // We have already created this placeholder
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// If the type exists (it should)
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if (const Type* Ty = getType(type)) {
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// Create the place holder
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Value *Val = new Argument(Ty);
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ForwardReferences.insert(I, std::make_pair(KeyValue, Val));
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return Val;
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}
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error("Can't create placeholder for value of type slot #" + utostr(type));
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return 0; // just silence warning, error calls longjmp
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}
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/// Just like getValue, except that it returns a null pointer
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/// only on error. It always returns a constant (meaning that if the value is
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/// defined, but is not a constant, that is an error). If the specified
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/// constant hasn't been parsed yet, a placeholder is defined and used.
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/// Later, after the real value is parsed, the placeholder is eliminated.
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Constant* BytecodeReader::getConstantValue(unsigned TypeSlot, unsigned Slot) {
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if (Value *V = getValue(TypeSlot, Slot, false))
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if (Constant *C = dyn_cast<Constant>(V))
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return C; // If we already have the value parsed, just return it
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else
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error("Value for slot " + utostr(Slot) +
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" is expected to be a constant!");
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std::pair<unsigned, unsigned> Key(TypeSlot, Slot);
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ConstantRefsType::iterator I = ConstantFwdRefs.lower_bound(Key);
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if (I != ConstantFwdRefs.end() && I->first == Key) {
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return I->second;
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} else {
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// Create a placeholder for the constant reference and
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// keep track of the fact that we have a forward ref to recycle it
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Constant *C = new ConstantPlaceHolder(getType(TypeSlot));
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// Keep track of the fact that we have a forward ref to recycle it
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ConstantFwdRefs.insert(I, std::make_pair(Key, C));
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return C;
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}
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}
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//===----------------------------------------------------------------------===//
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// IR Construction Methods
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//===----------------------------------------------------------------------===//
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/// As values are created, they are inserted into the appropriate place
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/// with this method. The ValueTable argument must be one of ModuleValues
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/// or FunctionValues data members of this class.
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unsigned BytecodeReader::insertValue(Value *Val, unsigned type,
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ValueTable &ValueTab) {
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if (ValueTab.size() <= type)
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ValueTab.resize(type+1);
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if (!ValueTab[type]) ValueTab[type] = new ValueList();
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ValueTab[type]->push_back(Val);
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bool HasOffset = hasImplicitNull(type) && !isa<OpaqueType>(Val->getType());
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return ValueTab[type]->size()-1 + HasOffset;
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}
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/// Insert the arguments of a function as new values in the reader.
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void BytecodeReader::insertArguments(Function* F) {
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const FunctionType *FT = F->getFunctionType();
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Function::arg_iterator AI = F->arg_begin();
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for (FunctionType::param_iterator It = FT->param_begin();
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It != FT->param_end(); ++It, ++AI)
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insertValue(AI, getTypeSlot(AI->getType()), FunctionValues);
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}
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//===----------------------------------------------------------------------===//
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// Bytecode Parsing Methods
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//===----------------------------------------------------------------------===//
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/// This method parses a single instruction. The instruction is
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/// inserted at the end of the \p BB provided. The arguments of
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/// the instruction are provided in the \p Oprnds vector.
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void BytecodeReader::ParseInstruction(std::vector<unsigned> &Oprnds,
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BasicBlock* BB) {
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BufPtr SaveAt = At;
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// Clear instruction data
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Oprnds.clear();
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unsigned iType = 0;
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unsigned Opcode = 0;
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unsigned Op = read_uint();
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// bits Instruction format: Common to all formats
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// --------------------------
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// 01-00: Opcode type, fixed to 1.
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// 07-02: Opcode
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Opcode = (Op >> 2) & 63;
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Oprnds.resize((Op >> 0) & 03);
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// Extract the operands
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switch (Oprnds.size()) {
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case 1:
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// bits Instruction format:
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// --------------------------
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// 19-08: Resulting type plane
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// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
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//
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iType = (Op >> 8) & 4095;
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Oprnds[0] = (Op >> 20) & 4095;
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if (Oprnds[0] == 4095) // Handle special encoding for 0 operands...
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Oprnds.resize(0);
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break;
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case 2:
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// bits Instruction format:
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// --------------------------
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// 15-08: Resulting type plane
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// 23-16: Operand #1
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// 31-24: Operand #2
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//
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iType = (Op >> 8) & 255;
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Oprnds[0] = (Op >> 16) & 255;
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Oprnds[1] = (Op >> 24) & 255;
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break;
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case 3:
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// bits Instruction format:
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// --------------------------
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// 13-08: Resulting type plane
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// 19-14: Operand #1
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// 25-20: Operand #2
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// 31-26: Operand #3
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//
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iType = (Op >> 8) & 63;
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Oprnds[0] = (Op >> 14) & 63;
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Oprnds[1] = (Op >> 20) & 63;
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Oprnds[2] = (Op >> 26) & 63;
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break;
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case 0:
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At -= 4; // Hrm, try this again...
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Opcode = read_vbr_uint();
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Opcode >>= 2;
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iType = read_vbr_uint();
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unsigned NumOprnds = read_vbr_uint();
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Oprnds.resize(NumOprnds);
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if (NumOprnds == 0)
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error("Zero-argument instruction found; this is invalid.");
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for (unsigned i = 0; i != NumOprnds; ++i)
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Oprnds[i] = read_vbr_uint();
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break;
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}
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const Type *InstTy = getType(iType);
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// Make the necessary adjustments for dealing with backwards compatibility
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// of opcodes.
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Instruction* Result = 0;
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// We have enough info to inform the handler now.
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if (Handler)
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Handler->handleInstruction(Opcode, InstTy, Oprnds, At-SaveAt);
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// First, handle the easy binary operators case
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if (Opcode >= Instruction::BinaryOpsBegin &&
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Opcode < Instruction::BinaryOpsEnd && Oprnds.size() == 2) {
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Result = BinaryOperator::create(Instruction::BinaryOps(Opcode),
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getValue(iType, Oprnds[0]),
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getValue(iType, Oprnds[1]));
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} else {
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// Indicate that we don't think this is a call instruction (yet).
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// Process based on the Opcode read
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switch (Opcode) {
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default: // There was an error, this shouldn't happen.
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if (Result == 0)
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error("Illegal instruction read!");
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break;
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case Instruction::VAArg:
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if (Oprnds.size() != 2)
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error("Invalid VAArg instruction!");
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Result = new VAArgInst(getValue(iType, Oprnds[0]),
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getType(Oprnds[1]));
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break;
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case Instruction::ExtractElement: {
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if (Oprnds.size() != 2)
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error("Invalid extractelement instruction!");
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Value *V1 = getValue(iType, Oprnds[0]);
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Value *V2 = getValue(Int32TySlot, Oprnds[1]);
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if (!ExtractElementInst::isValidOperands(V1, V2))
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error("Invalid extractelement instruction!");
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Result = new ExtractElementInst(V1, V2);
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break;
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}
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case Instruction::InsertElement: {
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const PackedType *PackedTy = dyn_cast<PackedType>(InstTy);
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if (!PackedTy || Oprnds.size() != 3)
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error("Invalid insertelement instruction!");
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Value *V1 = getValue(iType, Oprnds[0]);
|
|
Value *V2 = getValue(getTypeSlot(PackedTy->getElementType()),Oprnds[1]);
|
|
Value *V3 = getValue(Int32TySlot, Oprnds[2]);
|
|
|
|
if (!InsertElementInst::isValidOperands(V1, V2, V3))
|
|
error("Invalid insertelement instruction!");
|
|
Result = new InsertElementInst(V1, V2, V3);
|
|
break;
|
|
}
|
|
case Instruction::ShuffleVector: {
|
|
const PackedType *PackedTy = dyn_cast<PackedType>(InstTy);
|
|
if (!PackedTy || Oprnds.size() != 3)
|
|
error("Invalid shufflevector instruction!");
|
|
Value *V1 = getValue(iType, Oprnds[0]);
|
|
Value *V2 = getValue(iType, Oprnds[1]);
|
|
const PackedType *EltTy =
|
|
PackedType::get(Type::Int32Ty, PackedTy->getNumElements());
|
|
Value *V3 = getValue(getTypeSlot(EltTy), Oprnds[2]);
|
|
if (!ShuffleVectorInst::isValidOperands(V1, V2, V3))
|
|
error("Invalid shufflevector instruction!");
|
|
Result = new ShuffleVectorInst(V1, V2, V3);
|
|
break;
|
|
}
|
|
case Instruction::Trunc:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new TruncInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::ZExt:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new ZExtInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::SExt:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid Cast instruction!");
|
|
Result = new SExtInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::FPTrunc:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new FPTruncInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::FPExt:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new FPExtInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::UIToFP:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new UIToFPInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::SIToFP:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new SIToFPInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::FPToUI:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new FPToUIInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::FPToSI:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new FPToSIInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::IntToPtr:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new IntToPtrInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::PtrToInt:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new PtrToIntInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::BitCast:
|
|
if (Oprnds.size() != 2)
|
|
error("Invalid cast instruction!");
|
|
Result = new BitCastInst(getValue(iType, Oprnds[0]),
|
|
getType(Oprnds[1]));
|
|
break;
|
|
case Instruction::Select:
|
|
if (Oprnds.size() != 3)
|
|
error("Invalid Select instruction!");
|
|
Result = new SelectInst(getValue(BoolTySlot, Oprnds[0]),
|
|
getValue(iType, Oprnds[1]),
|
|
getValue(iType, Oprnds[2]));
|
|
break;
|
|
case Instruction::PHI: {
|
|
if (Oprnds.size() == 0 || (Oprnds.size() & 1))
|
|
error("Invalid phi node encountered!");
|
|
|
|
PHINode *PN = new PHINode(InstTy);
|
|
PN->reserveOperandSpace(Oprnds.size());
|
|
for (unsigned i = 0, e = Oprnds.size(); i != e; i += 2)
|
|
PN->addIncoming(
|
|
getValue(iType, Oprnds[i]), getBasicBlock(Oprnds[i+1]));
|
|
Result = PN;
|
|
break;
|
|
}
|
|
case Instruction::ICmp:
|
|
case Instruction::FCmp:
|
|
if (Oprnds.size() != 3)
|
|
error("Cmp instructions requires 3 operands");
|
|
// These instructions encode the comparison predicate as the 3rd operand.
|
|
Result = CmpInst::create(Instruction::OtherOps(Opcode),
|
|
static_cast<unsigned short>(Oprnds[2]),
|
|
getValue(iType, Oprnds[0]), getValue(iType, Oprnds[1]));
|
|
break;
|
|
case Instruction::Shl:
|
|
case Instruction::LShr:
|
|
case Instruction::AShr:
|
|
Result = new ShiftInst(Instruction::OtherOps(Opcode),
|
|
getValue(iType, Oprnds[0]),
|
|
getValue(Int8TySlot, Oprnds[1]));
|
|
break;
|
|
case Instruction::Ret:
|
|
if (Oprnds.size() == 0)
|
|
Result = new ReturnInst();
|
|
else if (Oprnds.size() == 1)
|
|
Result = new ReturnInst(getValue(iType, Oprnds[0]));
|
|
else
|
|
error("Unrecognized instruction!");
|
|
break;
|
|
|
|
case Instruction::Br:
|
|
if (Oprnds.size() == 1)
|
|
Result = new BranchInst(getBasicBlock(Oprnds[0]));
|
|
else if (Oprnds.size() == 3)
|
|
Result = new BranchInst(getBasicBlock(Oprnds[0]),
|
|
getBasicBlock(Oprnds[1]), getValue(BoolTySlot, Oprnds[2]));
|
|
else
|
|
error("Invalid number of operands for a 'br' instruction!");
|
|
break;
|
|
case Instruction::Switch: {
|
|
if (Oprnds.size() & 1)
|
|
error("Switch statement with odd number of arguments!");
|
|
|
|
SwitchInst *I = new SwitchInst(getValue(iType, Oprnds[0]),
|
|
getBasicBlock(Oprnds[1]),
|
|
Oprnds.size()/2-1);
|
|
for (unsigned i = 2, e = Oprnds.size(); i != e; i += 2)
|
|
I->addCase(cast<ConstantInt>(getValue(iType, Oprnds[i])),
|
|
getBasicBlock(Oprnds[i+1]));
|
|
Result = I;
|
|
break;
|
|
}
|
|
case 58: // Call with extra operand for calling conv
|
|
case 59: // tail call, Fast CC
|
|
case 60: // normal call, Fast CC
|
|
case 61: // tail call, C Calling Conv
|
|
case Instruction::Call: { // Normal Call, C Calling Convention
|
|
if (Oprnds.size() == 0)
|
|
error("Invalid call instruction encountered!");
|
|
Value *F = getValue(iType, Oprnds[0]);
|
|
|
|
unsigned CallingConv = CallingConv::C;
|
|
bool isTailCall = false;
|
|
|
|
if (Opcode == 61 || Opcode == 59)
|
|
isTailCall = true;
|
|
|
|
if (Opcode == 58) {
|
|
isTailCall = Oprnds.back() & 1;
|
|
CallingConv = Oprnds.back() >> 1;
|
|
Oprnds.pop_back();
|
|
} else if (Opcode == 59 || Opcode == 60) {
|
|
CallingConv = CallingConv::Fast;
|
|
}
|
|
|
|
// Check to make sure we have a pointer to function type
|
|
const PointerType *PTy = dyn_cast<PointerType>(F->getType());
|
|
if (PTy == 0) error("Call to non function pointer value!");
|
|
const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
|
|
if (FTy == 0) error("Call to non function pointer value!");
|
|
|
|
std::vector<Value *> Params;
|
|
if (!FTy->isVarArg()) {
|
|
FunctionType::param_iterator It = FTy->param_begin();
|
|
|
|
for (unsigned i = 1, e = Oprnds.size(); i != e; ++i) {
|
|
if (It == FTy->param_end())
|
|
error("Invalid call instruction!");
|
|
Params.push_back(getValue(getTypeSlot(*It++), Oprnds[i]));
|
|
}
|
|
if (It != FTy->param_end())
|
|
error("Invalid call instruction!");
|
|
} else {
|
|
Oprnds.erase(Oprnds.begin(), Oprnds.begin()+1);
|
|
|
|
unsigned FirstVariableOperand;
|
|
if (Oprnds.size() < FTy->getNumParams())
|
|
error("Call instruction missing operands!");
|
|
|
|
// Read all of the fixed arguments
|
|
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
|
|
Params.push_back(
|
|
getValue(getTypeSlot(FTy->getParamType(i)),Oprnds[i]));
|
|
|
|
FirstVariableOperand = FTy->getNumParams();
|
|
|
|
if ((Oprnds.size()-FirstVariableOperand) & 1)
|
|
error("Invalid call instruction!"); // Must be pairs of type/value
|
|
|
|
for (unsigned i = FirstVariableOperand, e = Oprnds.size();
|
|
i != e; i += 2)
|
|
Params.push_back(getValue(Oprnds[i], Oprnds[i+1]));
|
|
}
|
|
|
|
Result = new CallInst(F, Params);
|
|
if (isTailCall) cast<CallInst>(Result)->setTailCall();
|
|
if (CallingConv) cast<CallInst>(Result)->setCallingConv(CallingConv);
|
|
break;
|
|
}
|
|
case Instruction::Invoke: { // Invoke C CC
|
|
if (Oprnds.size() < 3)
|
|
error("Invalid invoke instruction!");
|
|
Value *F = getValue(iType, Oprnds[0]);
|
|
|
|
// Check to make sure we have a pointer to function type
|
|
const PointerType *PTy = dyn_cast<PointerType>(F->getType());
|
|
if (PTy == 0)
|
|
error("Invoke to non function pointer value!");
|
|
const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
|
|
if (FTy == 0)
|
|
error("Invoke to non function pointer value!");
|
|
|
|
std::vector<Value *> Params;
|
|
BasicBlock *Normal, *Except;
|
|
unsigned CallingConv = Oprnds.back();
|
|
Oprnds.pop_back();
|
|
|
|
if (!FTy->isVarArg()) {
|
|
Normal = getBasicBlock(Oprnds[1]);
|
|
Except = getBasicBlock(Oprnds[2]);
|
|
|
|
FunctionType::param_iterator It = FTy->param_begin();
|
|
for (unsigned i = 3, e = Oprnds.size(); i != e; ++i) {
|
|
if (It == FTy->param_end())
|
|
error("Invalid invoke instruction!");
|
|
Params.push_back(getValue(getTypeSlot(*It++), Oprnds[i]));
|
|
}
|
|
if (It != FTy->param_end())
|
|
error("Invalid invoke instruction!");
|
|
} else {
|
|
Oprnds.erase(Oprnds.begin(), Oprnds.begin()+1);
|
|
|
|
Normal = getBasicBlock(Oprnds[0]);
|
|
Except = getBasicBlock(Oprnds[1]);
|
|
|
|
unsigned FirstVariableArgument = FTy->getNumParams()+2;
|
|
for (unsigned i = 2; i != FirstVariableArgument; ++i)
|
|
Params.push_back(getValue(getTypeSlot(FTy->getParamType(i-2)),
|
|
Oprnds[i]));
|
|
|
|
// Must be type/value pairs. If not, error out.
|
|
if (Oprnds.size()-FirstVariableArgument & 1)
|
|
error("Invalid invoke instruction!");
|
|
|
|
for (unsigned i = FirstVariableArgument; i < Oprnds.size(); i += 2)
|
|
Params.push_back(getValue(Oprnds[i], Oprnds[i+1]));
|
|
}
|
|
|
|
Result = new InvokeInst(F, Normal, Except, Params);
|
|
if (CallingConv) cast<InvokeInst>(Result)->setCallingConv(CallingConv);
|
|
break;
|
|
}
|
|
case Instruction::Malloc: {
|
|
unsigned Align = 0;
|
|
if (Oprnds.size() == 2)
|
|
Align = (1 << Oprnds[1]) >> 1;
|
|
else if (Oprnds.size() > 2)
|
|
error("Invalid malloc instruction!");
|
|
if (!isa<PointerType>(InstTy))
|
|
error("Invalid malloc instruction!");
|
|
|
|
Result = new MallocInst(cast<PointerType>(InstTy)->getElementType(),
|
|
getValue(Int32TySlot, Oprnds[0]), Align);
|
|
break;
|
|
}
|
|
case Instruction::Alloca: {
|
|
unsigned Align = 0;
|
|
if (Oprnds.size() == 2)
|
|
Align = (1 << Oprnds[1]) >> 1;
|
|
else if (Oprnds.size() > 2)
|
|
error("Invalid alloca instruction!");
|
|
if (!isa<PointerType>(InstTy))
|
|
error("Invalid alloca instruction!");
|
|
|
|
Result = new AllocaInst(cast<PointerType>(InstTy)->getElementType(),
|
|
getValue(Int32TySlot, Oprnds[0]), Align);
|
|
break;
|
|
}
|
|
case Instruction::Free:
|
|
if (!isa<PointerType>(InstTy))
|
|
error("Invalid free instruction!");
|
|
Result = new FreeInst(getValue(iType, Oprnds[0]));
|
|
break;
|
|
case Instruction::GetElementPtr: {
|
|
if (Oprnds.size() == 0 || !isa<PointerType>(InstTy))
|
|
error("Invalid getelementptr instruction!");
|
|
|
|
SmallVector<Value*, 8> Idx;
|
|
|
|
const Type *NextTy = InstTy;
|
|
for (unsigned i = 1, e = Oprnds.size(); i != e; ++i) {
|
|
const CompositeType *TopTy = dyn_cast_or_null<CompositeType>(NextTy);
|
|
if (!TopTy)
|
|
error("Invalid getelementptr instruction!");
|
|
|
|
unsigned ValIdx = Oprnds[i];
|
|
unsigned IdxTy = 0;
|
|
// Struct indices are always uints, sequential type indices can be
|
|
// any of the 32 or 64-bit integer types. The actual choice of
|
|
// type is encoded in the low bit of the slot number.
|
|
if (isa<StructType>(TopTy))
|
|
IdxTy = Int32TySlot;
|
|
else {
|
|
switch (ValIdx & 1) {
|
|
default:
|
|
case 0: IdxTy = Int32TySlot; break;
|
|
case 1: IdxTy = Int64TySlot; break;
|
|
}
|
|
ValIdx >>= 1;
|
|
}
|
|
Idx.push_back(getValue(IdxTy, ValIdx));
|
|
NextTy = GetElementPtrInst::getIndexedType(InstTy, &Idx[0], Idx.size(),
|
|
true);
|
|
}
|
|
|
|
Result = new GetElementPtrInst(getValue(iType, Oprnds[0]),
|
|
&Idx[0], Idx.size());
|
|
break;
|
|
}
|
|
case 62: // volatile load
|
|
case Instruction::Load:
|
|
if (Oprnds.size() != 1 || !isa<PointerType>(InstTy))
|
|
error("Invalid load instruction!");
|
|
Result = new LoadInst(getValue(iType, Oprnds[0]), "", Opcode == 62);
|
|
break;
|
|
case 63: // volatile store
|
|
case Instruction::Store: {
|
|
if (!isa<PointerType>(InstTy) || Oprnds.size() != 2)
|
|
error("Invalid store instruction!");
|
|
|
|
Value *Ptr = getValue(iType, Oprnds[1]);
|
|
const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
|
|
Result = new StoreInst(getValue(getTypeSlot(ValTy), Oprnds[0]), Ptr,
|
|
Opcode == 63);
|
|
break;
|
|
}
|
|
case Instruction::Unwind:
|
|
if (Oprnds.size() != 0) error("Invalid unwind instruction!");
|
|
Result = new UnwindInst();
|
|
break;
|
|
case Instruction::Unreachable:
|
|
if (Oprnds.size() != 0) error("Invalid unreachable instruction!");
|
|
Result = new UnreachableInst();
|
|
break;
|
|
} // end switch(Opcode)
|
|
} // end if !Result
|
|
|
|
BB->getInstList().push_back(Result);
|
|
|
|
unsigned TypeSlot;
|
|
if (Result->getType() == InstTy)
|
|
TypeSlot = iType;
|
|
else
|
|
TypeSlot = getTypeSlot(Result->getType());
|
|
|
|
insertValue(Result, TypeSlot, FunctionValues);
|
|
}
|
|
|
|
/// Get a particular numbered basic block, which might be a forward reference.
|
|
/// This works together with ParseInstructionList to handle these forward
|
|
/// references in a clean manner. This function is used when constructing
|
|
/// phi, br, switch, and other instructions that reference basic blocks.
|
|
/// Blocks are numbered sequentially as they appear in the function.
|
|
BasicBlock *BytecodeReader::getBasicBlock(unsigned ID) {
|
|
// Make sure there is room in the table...
|
|
if (ParsedBasicBlocks.size() <= ID) ParsedBasicBlocks.resize(ID+1);
|
|
|
|
// First check to see if this is a backwards reference, i.e. this block
|
|
// has already been created, or if the forward reference has already
|
|
// been created.
|
|
if (ParsedBasicBlocks[ID])
|
|
return ParsedBasicBlocks[ID];
|
|
|
|
// Otherwise, the basic block has not yet been created. Do so and add it to
|
|
// the ParsedBasicBlocks list.
|
|
return ParsedBasicBlocks[ID] = new BasicBlock();
|
|
}
|
|
|
|
/// Parse all of the BasicBlock's & Instruction's in the body of a function.
|
|
/// In post 1.0 bytecode files, we no longer emit basic block individually,
|
|
/// in order to avoid per-basic-block overhead.
|
|
/// @returns the number of basic blocks encountered.
|
|
unsigned BytecodeReader::ParseInstructionList(Function* F) {
|
|
unsigned BlockNo = 0;
|
|
std::vector<unsigned> Args;
|
|
|
|
while (moreInBlock()) {
|
|
if (Handler) Handler->handleBasicBlockBegin(BlockNo);
|
|
BasicBlock *BB;
|
|
if (ParsedBasicBlocks.size() == BlockNo)
|
|
ParsedBasicBlocks.push_back(BB = new BasicBlock());
|
|
else if (ParsedBasicBlocks[BlockNo] == 0)
|
|
BB = ParsedBasicBlocks[BlockNo] = new BasicBlock();
|
|
else
|
|
BB = ParsedBasicBlocks[BlockNo];
|
|
++BlockNo;
|
|
F->getBasicBlockList().push_back(BB);
|
|
|
|
// Read instructions into this basic block until we get to a terminator
|
|
while (moreInBlock() && !BB->getTerminator())
|
|
ParseInstruction(Args, BB);
|
|
|
|
if (!BB->getTerminator())
|
|
error("Non-terminated basic block found!");
|
|
|
|
if (Handler) Handler->handleBasicBlockEnd(BlockNo-1);
|
|
}
|
|
|
|
return BlockNo;
|
|
}
|
|
|
|
/// Parse a type symbol table.
|
|
void BytecodeReader::ParseTypeSymbolTable(TypeSymbolTable *TST) {
|
|
// Type Symtab block header: [num entries]
|
|
unsigned NumEntries = read_vbr_uint();
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
// Symtab entry: [type slot #][name]
|
|
unsigned slot = read_vbr_uint();
|
|
std::string Name = read_str();
|
|
const Type* T = getType(slot);
|
|
TST->insert(Name, T);
|
|
}
|
|
}
|
|
|
|
/// Parse a value symbol table. This works for both module level and function
|
|
/// level symbol tables. For function level symbol tables, the CurrentFunction
|
|
/// parameter must be non-zero and the ST parameter must correspond to
|
|
/// CurrentFunction's symbol table. For Module level symbol tables, the
|
|
/// CurrentFunction argument must be zero.
|
|
void BytecodeReader::ParseValueSymbolTable(Function *CurrentFunction,
|
|
SymbolTable *ST) {
|
|
|
|
if (Handler) Handler->handleSymbolTableBegin(CurrentFunction,ST);
|
|
|
|
// Allow efficient basic block lookup by number.
|
|
std::vector<BasicBlock*> BBMap;
|
|
if (CurrentFunction)
|
|
for (Function::iterator I = CurrentFunction->begin(),
|
|
E = CurrentFunction->end(); I != E; ++I)
|
|
BBMap.push_back(I);
|
|
|
|
while (moreInBlock()) {
|
|
// Symtab block header: [num entries][type id number]
|
|
unsigned NumEntries = read_vbr_uint();
|
|
unsigned Typ = read_vbr_uint();
|
|
|
|
for (unsigned i = 0; i != NumEntries; ++i) {
|
|
// Symtab entry: [def slot #][name]
|
|
unsigned slot = read_vbr_uint();
|
|
std::string Name = read_str();
|
|
Value *V = 0;
|
|
if (Typ == LabelTySlot) {
|
|
if (slot < BBMap.size())
|
|
V = BBMap[slot];
|
|
} else {
|
|
V = getValue(Typ, slot, false); // Find mapping...
|
|
}
|
|
if (V == 0)
|
|
error("Failed value look-up for name '" + Name + "'");
|
|
V->setName(Name);
|
|
}
|
|
}
|
|
checkPastBlockEnd("Symbol Table");
|
|
if (Handler) Handler->handleSymbolTableEnd();
|
|
}
|
|
|
|
// Parse a single type. The typeid is read in first. If its a primitive type
|
|
// then nothing else needs to be read, we know how to instantiate it. If its
|
|
// a derived type, then additional data is read to fill out the type
|
|
// definition.
|
|
const Type *BytecodeReader::ParseType() {
|
|
unsigned PrimType = read_vbr_uint();
|
|
const Type *Result = 0;
|
|
if ((Result = Type::getPrimitiveType((Type::TypeID)PrimType)))
|
|
return Result;
|
|
|
|
switch (PrimType) {
|
|
case Type::IntegerTyID: {
|
|
unsigned NumBits = read_vbr_uint();
|
|
Result = IntegerType::get(NumBits);
|
|
break;
|
|
}
|
|
case Type::FunctionTyID: {
|
|
const Type *RetType = readType();
|
|
unsigned RetAttr = read_vbr_uint();
|
|
|
|
unsigned NumParams = read_vbr_uint();
|
|
|
|
std::vector<const Type*> Params;
|
|
std::vector<FunctionType::ParameterAttributes> Attrs;
|
|
Attrs.push_back(FunctionType::ParameterAttributes(RetAttr));
|
|
while (NumParams--) {
|
|
Params.push_back(readType());
|
|
if (Params.back() != Type::VoidTy)
|
|
Attrs.push_back(FunctionType::ParameterAttributes(read_vbr_uint()));
|
|
}
|
|
|
|
bool isVarArg = Params.size() && Params.back() == Type::VoidTy;
|
|
if (isVarArg) Params.pop_back();
|
|
|
|
Result = FunctionType::get(RetType, Params, isVarArg, Attrs);
|
|
break;
|
|
}
|
|
case Type::ArrayTyID: {
|
|
const Type *ElementType = readType();
|
|
unsigned NumElements = read_vbr_uint();
|
|
Result = ArrayType::get(ElementType, NumElements);
|
|
break;
|
|
}
|
|
case Type::PackedTyID: {
|
|
const Type *ElementType = readType();
|
|
unsigned NumElements = read_vbr_uint();
|
|
Result = PackedType::get(ElementType, NumElements);
|
|
break;
|
|
}
|
|
case Type::StructTyID: {
|
|
std::vector<const Type*> Elements;
|
|
unsigned Typ = read_vbr_uint();
|
|
while (Typ) { // List is terminated by void/0 typeid
|
|
Elements.push_back(getType(Typ));
|
|
Typ = read_vbr_uint();
|
|
}
|
|
|
|
Result = StructType::get(Elements, false);
|
|
break;
|
|
}
|
|
case Type::PackedStructTyID: {
|
|
std::vector<const Type*> Elements;
|
|
unsigned Typ = read_vbr_uint();
|
|
while (Typ) { // List is terminated by void/0 typeid
|
|
Elements.push_back(getType(Typ));
|
|
Typ = read_vbr_uint();
|
|
}
|
|
|
|
Result = StructType::get(Elements, true);
|
|
break;
|
|
}
|
|
case Type::PointerTyID: {
|
|
Result = PointerType::get(readType());
|
|
break;
|
|
}
|
|
|
|
case Type::OpaqueTyID: {
|
|
Result = OpaqueType::get();
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error("Don't know how to deserialize primitive type " + utostr(PrimType));
|
|
break;
|
|
}
|
|
if (Handler) Handler->handleType(Result);
|
|
return Result;
|
|
}
|
|
|
|
// ParseTypes - We have to use this weird code to handle recursive
|
|
// types. We know that recursive types will only reference the current slab of
|
|
// values in the type plane, but they can forward reference types before they
|
|
// have been read. For example, Type #0 might be '{ Ty#1 }' and Type #1 might
|
|
// be 'Ty#0*'. When reading Type #0, type number one doesn't exist. To fix
|
|
// this ugly problem, we pessimistically insert an opaque type for each type we
|
|
// are about to read. This means that forward references will resolve to
|
|
// something and when we reread the type later, we can replace the opaque type
|
|
// with a new resolved concrete type.
|
|
//
|
|
void BytecodeReader::ParseTypes(TypeListTy &Tab, unsigned NumEntries){
|
|
assert(Tab.size() == 0 && "should not have read type constants in before!");
|
|
|
|
// Insert a bunch of opaque types to be resolved later...
|
|
Tab.reserve(NumEntries);
|
|
for (unsigned i = 0; i != NumEntries; ++i)
|
|
Tab.push_back(OpaqueType::get());
|
|
|
|
if (Handler)
|
|
Handler->handleTypeList(NumEntries);
|
|
|
|
// If we are about to resolve types, make sure the type cache is clear.
|
|
if (NumEntries)
|
|
ModuleTypeIDCache.clear();
|
|
|
|
// Loop through reading all of the types. Forward types will make use of the
|
|
// opaque types just inserted.
|
|
//
|
|
for (unsigned i = 0; i != NumEntries; ++i) {
|
|
const Type* NewTy = ParseType();
|
|
const Type* OldTy = Tab[i].get();
|
|
if (NewTy == 0)
|
|
error("Couldn't parse type!");
|
|
|
|
// Don't directly push the new type on the Tab. Instead we want to replace
|
|
// the opaque type we previously inserted with the new concrete value. This
|
|
// approach helps with forward references to types. The refinement from the
|
|
// abstract (opaque) type to the new type causes all uses of the abstract
|
|
// type to use the concrete type (NewTy). This will also cause the opaque
|
|
// type to be deleted.
|
|
cast<DerivedType>(const_cast<Type*>(OldTy))->refineAbstractTypeTo(NewTy);
|
|
|
|
// This should have replaced the old opaque type with the new type in the
|
|
// value table... or with a preexisting type that was already in the system.
|
|
// Let's just make sure it did.
|
|
assert(Tab[i] != OldTy && "refineAbstractType didn't work!");
|
|
}
|
|
}
|
|
|
|
/// Parse a single constant value
|
|
Value *BytecodeReader::ParseConstantPoolValue(unsigned TypeID) {
|
|
// We must check for a ConstantExpr before switching by type because
|
|
// a ConstantExpr can be of any type, and has no explicit value.
|
|
//
|
|
// 0 if not expr; numArgs if is expr
|
|
unsigned isExprNumArgs = read_vbr_uint();
|
|
|
|
if (isExprNumArgs) {
|
|
// 'undef' is encoded with 'exprnumargs' == 1.
|
|
if (isExprNumArgs == 1)
|
|
return UndefValue::get(getType(TypeID));
|
|
|
|
// Inline asm is encoded with exprnumargs == ~0U.
|
|
if (isExprNumArgs == ~0U) {
|
|
std::string AsmStr = read_str();
|
|
std::string ConstraintStr = read_str();
|
|
unsigned Flags = read_vbr_uint();
|
|
|
|
const PointerType *PTy = dyn_cast<PointerType>(getType(TypeID));
|
|
const FunctionType *FTy =
|
|
PTy ? dyn_cast<FunctionType>(PTy->getElementType()) : 0;
|
|
|
|
if (!FTy || !InlineAsm::Verify(FTy, ConstraintStr))
|
|
error("Invalid constraints for inline asm");
|
|
if (Flags & ~1U)
|
|
error("Invalid flags for inline asm");
|
|
bool HasSideEffects = Flags & 1;
|
|
return InlineAsm::get(FTy, AsmStr, ConstraintStr, HasSideEffects);
|
|
}
|
|
|
|
--isExprNumArgs;
|
|
|
|
// FIXME: Encoding of constant exprs could be much more compact!
|
|
std::vector<Constant*> ArgVec;
|
|
ArgVec.reserve(isExprNumArgs);
|
|
unsigned Opcode = read_vbr_uint();
|
|
|
|
// Read the slot number and types of each of the arguments
|
|
for (unsigned i = 0; i != isExprNumArgs; ++i) {
|
|
unsigned ArgValSlot = read_vbr_uint();
|
|
unsigned ArgTypeSlot = read_vbr_uint();
|
|
|
|
// Get the arg value from its slot if it exists, otherwise a placeholder
|
|
ArgVec.push_back(getConstantValue(ArgTypeSlot, ArgValSlot));
|
|
}
|
|
|
|
// Construct a ConstantExpr of the appropriate kind
|
|
if (isExprNumArgs == 1) { // All one-operand expressions
|
|
if (!Instruction::isCast(Opcode))
|
|
error("Only cast instruction has one argument for ConstantExpr");
|
|
|
|
Constant *Result = ConstantExpr::getCast(Opcode, ArgVec[0],
|
|
getType(TypeID));
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::GetElementPtr) { // GetElementPtr
|
|
Constant *Result = ConstantExpr::getGetElementPtr(ArgVec[0], &ArgVec[1],
|
|
ArgVec.size()-1);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::Select) {
|
|
if (ArgVec.size() != 3)
|
|
error("Select instruction must have three arguments.");
|
|
Constant* Result = ConstantExpr::getSelect(ArgVec[0], ArgVec[1],
|
|
ArgVec[2]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::ExtractElement) {
|
|
if (ArgVec.size() != 2 ||
|
|
!ExtractElementInst::isValidOperands(ArgVec[0], ArgVec[1]))
|
|
error("Invalid extractelement constand expr arguments");
|
|
Constant* Result = ConstantExpr::getExtractElement(ArgVec[0], ArgVec[1]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::InsertElement) {
|
|
if (ArgVec.size() != 3 ||
|
|
!InsertElementInst::isValidOperands(ArgVec[0], ArgVec[1], ArgVec[2]))
|
|
error("Invalid insertelement constand expr arguments");
|
|
|
|
Constant *Result =
|
|
ConstantExpr::getInsertElement(ArgVec[0], ArgVec[1], ArgVec[2]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::ShuffleVector) {
|
|
if (ArgVec.size() != 3 ||
|
|
!ShuffleVectorInst::isValidOperands(ArgVec[0], ArgVec[1], ArgVec[2]))
|
|
error("Invalid shufflevector constant expr arguments.");
|
|
Constant *Result =
|
|
ConstantExpr::getShuffleVector(ArgVec[0], ArgVec[1], ArgVec[2]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::ICmp) {
|
|
if (ArgVec.size() != 2)
|
|
error("Invalid ICmp constant expr arguments.");
|
|
unsigned predicate = read_vbr_uint();
|
|
Constant *Result = ConstantExpr::getICmp(predicate, ArgVec[0], ArgVec[1]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else if (Opcode == Instruction::FCmp) {
|
|
if (ArgVec.size() != 2)
|
|
error("Invalid FCmp constant expr arguments.");
|
|
unsigned predicate = read_vbr_uint();
|
|
Constant *Result = ConstantExpr::getFCmp(predicate, ArgVec[0], ArgVec[1]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
} else { // All other 2-operand expressions
|
|
Constant* Result = ConstantExpr::get(Opcode, ArgVec[0], ArgVec[1]);
|
|
if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
|
|
return Result;
|
|
}
|
|
}
|
|
|
|
// Ok, not an ConstantExpr. We now know how to read the given type...
|
|
const Type *Ty = getType(TypeID);
|
|
Constant *Result = 0;
|
|
switch (Ty->getTypeID()) {
|
|
case Type::IntegerTyID: {
|
|
const IntegerType *IT = cast<IntegerType>(Ty);
|
|
if (IT->getBitWidth() <= 32) {
|
|
uint32_t Val = read_vbr_uint();
|
|
if (!ConstantInt::isValueValidForType(Ty, uint64_t(Val)))
|
|
error("Integer value read is invalid for type.");
|
|
Result = ConstantInt::get(IT, Val);
|
|
if (Handler) Handler->handleConstantValue(Result);
|
|
} else if (IT->getBitWidth() <= 64) {
|
|
uint64_t Val = read_vbr_uint64();
|
|
if (!ConstantInt::isValueValidForType(Ty, Val))
|
|
error("Invalid constant integer read.");
|
|
Result = ConstantInt::get(IT, Val);
|
|
if (Handler) Handler->handleConstantValue(Result);
|
|
} else
|
|
assert("Integer types > 64 bits not supported");
|
|
break;
|
|
}
|
|
case Type::FloatTyID: {
|
|
float Val;
|
|
read_float(Val);
|
|
Result = ConstantFP::get(Ty, Val);
|
|
if (Handler) Handler->handleConstantValue(Result);
|
|
break;
|
|
}
|
|
|
|
case Type::DoubleTyID: {
|
|
double Val;
|
|
read_double(Val);
|
|
Result = ConstantFP::get(Ty, Val);
|
|
if (Handler) Handler->handleConstantValue(Result);
|
|
break;
|
|
}
|
|
|
|
case Type::ArrayTyID: {
|
|
const ArrayType *AT = cast<ArrayType>(Ty);
|
|
unsigned NumElements = AT->getNumElements();
|
|
unsigned TypeSlot = getTypeSlot(AT->getElementType());
|
|
std::vector<Constant*> Elements;
|
|
Elements.reserve(NumElements);
|
|
while (NumElements--) // Read all of the elements of the constant.
|
|
Elements.push_back(getConstantValue(TypeSlot,
|
|
read_vbr_uint()));
|
|
Result = ConstantArray::get(AT, Elements);
|
|
if (Handler) Handler->handleConstantArray(AT, Elements, TypeSlot, Result);
|
|
break;
|
|
}
|
|
|
|
case Type::StructTyID: {
|
|
const StructType *ST = cast<StructType>(Ty);
|
|
|
|
std::vector<Constant *> Elements;
|
|
Elements.reserve(ST->getNumElements());
|
|
for (unsigned i = 0; i != ST->getNumElements(); ++i)
|
|
Elements.push_back(getConstantValue(ST->getElementType(i),
|
|
read_vbr_uint()));
|
|
|
|
Result = ConstantStruct::get(ST, Elements);
|
|
if (Handler) Handler->handleConstantStruct(ST, Elements, Result);
|
|
break;
|
|
}
|
|
|
|
case Type::PackedTyID: {
|
|
const PackedType *PT = cast<PackedType>(Ty);
|
|
unsigned NumElements = PT->getNumElements();
|
|
unsigned TypeSlot = getTypeSlot(PT->getElementType());
|
|
std::vector<Constant*> Elements;
|
|
Elements.reserve(NumElements);
|
|
while (NumElements--) // Read all of the elements of the constant.
|
|
Elements.push_back(getConstantValue(TypeSlot,
|
|
read_vbr_uint()));
|
|
Result = ConstantPacked::get(PT, Elements);
|
|
if (Handler) Handler->handleConstantPacked(PT, Elements, TypeSlot, Result);
|
|
break;
|
|
}
|
|
|
|
case Type::PointerTyID: { // ConstantPointerRef value (backwards compat).
|
|
const PointerType *PT = cast<PointerType>(Ty);
|
|
unsigned Slot = read_vbr_uint();
|
|
|
|
// Check to see if we have already read this global variable...
|
|
Value *Val = getValue(TypeID, Slot, false);
|
|
if (Val) {
|
|
GlobalValue *GV = dyn_cast<GlobalValue>(Val);
|
|
if (!GV) error("GlobalValue not in ValueTable!");
|
|
if (Handler) Handler->handleConstantPointer(PT, Slot, GV);
|
|
return GV;
|
|
} else {
|
|
error("Forward references are not allowed here.");
|
|
}
|
|
}
|
|
|
|
default:
|
|
error("Don't know how to deserialize constant value of type '" +
|
|
Ty->getDescription());
|
|
break;
|
|
}
|
|
|
|
// Check that we didn't read a null constant if they are implicit for this
|
|
// type plane. Do not do this check for constantexprs, as they may be folded
|
|
// to a null value in a way that isn't predicted when a .bc file is initially
|
|
// produced.
|
|
assert((!isa<Constant>(Result) || !cast<Constant>(Result)->isNullValue()) ||
|
|
!hasImplicitNull(TypeID) &&
|
|
"Cannot read null values from bytecode!");
|
|
return Result;
|
|
}
|
|
|
|
/// Resolve references for constants. This function resolves the forward
|
|
/// referenced constants in the ConstantFwdRefs map. It uses the
|
|
/// replaceAllUsesWith method of Value class to substitute the placeholder
|
|
/// instance with the actual instance.
|
|
void BytecodeReader::ResolveReferencesToConstant(Constant *NewV, unsigned Typ,
|
|
unsigned Slot) {
|
|
ConstantRefsType::iterator I =
|
|
ConstantFwdRefs.find(std::make_pair(Typ, Slot));
|
|
if (I == ConstantFwdRefs.end()) return; // Never forward referenced?
|
|
|
|
Value *PH = I->second; // Get the placeholder...
|
|
PH->replaceAllUsesWith(NewV);
|
|
delete PH; // Delete the old placeholder
|
|
ConstantFwdRefs.erase(I); // Remove the map entry for it
|
|
}
|
|
|
|
/// Parse the constant strings section.
|
|
void BytecodeReader::ParseStringConstants(unsigned NumEntries, ValueTable &Tab){
|
|
for (; NumEntries; --NumEntries) {
|
|
unsigned Typ = read_vbr_uint();
|
|
const Type *Ty = getType(Typ);
|
|
if (!isa<ArrayType>(Ty))
|
|
error("String constant data invalid!");
|
|
|
|
const ArrayType *ATy = cast<ArrayType>(Ty);
|
|
if (ATy->getElementType() != Type::Int8Ty &&
|
|
ATy->getElementType() != Type::Int8Ty)
|
|
error("String constant data invalid!");
|
|
|
|
// Read character data. The type tells us how long the string is.
|
|
char *Data = reinterpret_cast<char *>(alloca(ATy->getNumElements()));
|
|
read_data(Data, Data+ATy->getNumElements());
|
|
|
|
std::vector<Constant*> Elements(ATy->getNumElements());
|
|
const Type* ElemType = ATy->getElementType();
|
|
for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
|
|
Elements[i] = ConstantInt::get(ElemType, (unsigned char)Data[i]);
|
|
|
|
// Create the constant, inserting it as needed.
|
|
Constant *C = ConstantArray::get(ATy, Elements);
|
|
unsigned Slot = insertValue(C, Typ, Tab);
|
|
ResolveReferencesToConstant(C, Typ, Slot);
|
|
if (Handler) Handler->handleConstantString(cast<ConstantArray>(C));
|
|
}
|
|
}
|
|
|
|
/// Parse the constant pool.
|
|
void BytecodeReader::ParseConstantPool(ValueTable &Tab,
|
|
TypeListTy &TypeTab,
|
|
bool isFunction) {
|
|
if (Handler) Handler->handleGlobalConstantsBegin();
|
|
|
|
/// In LLVM 1.3 Type does not derive from Value so the types
|
|
/// do not occupy a plane. Consequently, we read the types
|
|
/// first in the constant pool.
|
|
if (isFunction) {
|
|
unsigned NumEntries = read_vbr_uint();
|
|
ParseTypes(TypeTab, NumEntries);
|
|
}
|
|
|
|
while (moreInBlock()) {
|
|
unsigned NumEntries = read_vbr_uint();
|
|
unsigned Typ = read_vbr_uint();
|
|
|
|
if (Typ == Type::VoidTyID) {
|
|
/// Use of Type::VoidTyID is a misnomer. It actually means
|
|
/// that the following plane is constant strings
|
|
assert(&Tab == &ModuleValues && "Cannot read strings in functions!");
|
|
ParseStringConstants(NumEntries, Tab);
|
|
} else {
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
Value *V = ParseConstantPoolValue(Typ);
|
|
assert(V && "ParseConstantPoolValue returned NULL!");
|
|
unsigned Slot = insertValue(V, Typ, Tab);
|
|
|
|
// If we are reading a function constant table, make sure that we adjust
|
|
// the slot number to be the real global constant number.
|
|
//
|
|
if (&Tab != &ModuleValues && Typ < ModuleValues.size() &&
|
|
ModuleValues[Typ])
|
|
Slot += ModuleValues[Typ]->size();
|
|
if (Constant *C = dyn_cast<Constant>(V))
|
|
ResolveReferencesToConstant(C, Typ, Slot);
|
|
}
|
|
}
|
|
}
|
|
|
|
// After we have finished parsing the constant pool, we had better not have
|
|
// any dangling references left.
|
|
if (!ConstantFwdRefs.empty()) {
|
|
ConstantRefsType::const_iterator I = ConstantFwdRefs.begin();
|
|
Constant* missingConst = I->second;
|
|
error(utostr(ConstantFwdRefs.size()) +
|
|
" unresolved constant reference exist. First one is '" +
|
|
missingConst->getName() + "' of type '" +
|
|
missingConst->getType()->getDescription() + "'.");
|
|
}
|
|
|
|
checkPastBlockEnd("Constant Pool");
|
|
if (Handler) Handler->handleGlobalConstantsEnd();
|
|
}
|
|
|
|
/// Parse the contents of a function. Note that this function can be
|
|
/// called lazily by materializeFunction
|
|
/// @see materializeFunction
|
|
void BytecodeReader::ParseFunctionBody(Function* F) {
|
|
|
|
unsigned FuncSize = BlockEnd - At;
|
|
GlobalValue::LinkageTypes Linkage = GlobalValue::ExternalLinkage;
|
|
GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
|
|
|
|
unsigned rWord = read_vbr_uint();
|
|
unsigned LinkageID = rWord & 65535;
|
|
unsigned VisibilityID = rWord >> 16;
|
|
switch (LinkageID) {
|
|
case 0: Linkage = GlobalValue::ExternalLinkage; break;
|
|
case 1: Linkage = GlobalValue::WeakLinkage; break;
|
|
case 2: Linkage = GlobalValue::AppendingLinkage; break;
|
|
case 3: Linkage = GlobalValue::InternalLinkage; break;
|
|
case 4: Linkage = GlobalValue::LinkOnceLinkage; break;
|
|
case 5: Linkage = GlobalValue::DLLImportLinkage; break;
|
|
case 6: Linkage = GlobalValue::DLLExportLinkage; break;
|
|
case 7: Linkage = GlobalValue::ExternalWeakLinkage; break;
|
|
default:
|
|
error("Invalid linkage type for Function.");
|
|
Linkage = GlobalValue::InternalLinkage;
|
|
break;
|
|
}
|
|
switch (VisibilityID) {
|
|
case 0: Visibility = GlobalValue::DefaultVisibility; break;
|
|
case 1: Visibility = GlobalValue::HiddenVisibility; break;
|
|
default:
|
|
error("Unknown visibility type: " + utostr(VisibilityID));
|
|
Visibility = GlobalValue::DefaultVisibility;
|
|
break;
|
|
}
|
|
|
|
F->setLinkage(Linkage);
|
|
F->setVisibility(Visibility);
|
|
if (Handler) Handler->handleFunctionBegin(F,FuncSize);
|
|
|
|
// Keep track of how many basic blocks we have read in...
|
|
unsigned BlockNum = 0;
|
|
bool InsertedArguments = false;
|
|
|
|
BufPtr MyEnd = BlockEnd;
|
|
while (At < MyEnd) {
|
|
unsigned Type, Size;
|
|
BufPtr OldAt = At;
|
|
read_block(Type, Size);
|
|
|
|
switch (Type) {
|
|
case BytecodeFormat::ConstantPoolBlockID:
|
|
if (!InsertedArguments) {
|
|
// Insert arguments into the value table before we parse the first basic
|
|
// block in the function
|
|
insertArguments(F);
|
|
InsertedArguments = true;
|
|
}
|
|
|
|
ParseConstantPool(FunctionValues, FunctionTypes, true);
|
|
break;
|
|
|
|
case BytecodeFormat::InstructionListBlockID: {
|
|
// Insert arguments into the value table before we parse the instruction
|
|
// list for the function
|
|
if (!InsertedArguments) {
|
|
insertArguments(F);
|
|
InsertedArguments = true;
|
|
}
|
|
|
|
if (BlockNum)
|
|
error("Already parsed basic blocks!");
|
|
BlockNum = ParseInstructionList(F);
|
|
break;
|
|
}
|
|
|
|
case BytecodeFormat::ValueSymbolTableBlockID:
|
|
ParseValueSymbolTable(F, &F->getValueSymbolTable());
|
|
break;
|
|
|
|
case BytecodeFormat::TypeSymbolTableBlockID:
|
|
error("Functions don't have type symbol tables");
|
|
break;
|
|
|
|
default:
|
|
At += Size;
|
|
if (OldAt > At)
|
|
error("Wrapped around reading bytecode.");
|
|
break;
|
|
}
|
|
BlockEnd = MyEnd;
|
|
}
|
|
|
|
// Make sure there were no references to non-existant basic blocks.
|
|
if (BlockNum != ParsedBasicBlocks.size())
|
|
error("Illegal basic block operand reference");
|
|
|
|
ParsedBasicBlocks.clear();
|
|
|
|
// Resolve forward references. Replace any uses of a forward reference value
|
|
// with the real value.
|
|
while (!ForwardReferences.empty()) {
|
|
std::map<std::pair<unsigned,unsigned>, Value*>::iterator
|
|
I = ForwardReferences.begin();
|
|
Value *V = getValue(I->first.first, I->first.second, false);
|
|
Value *PlaceHolder = I->second;
|
|
PlaceHolder->replaceAllUsesWith(V);
|
|
ForwardReferences.erase(I);
|
|
delete PlaceHolder;
|
|
}
|
|
|
|
// Clear out function-level types...
|
|
FunctionTypes.clear();
|
|
freeTable(FunctionValues);
|
|
|
|
if (Handler) Handler->handleFunctionEnd(F);
|
|
}
|
|
|
|
/// This function parses LLVM functions lazily. It obtains the type of the
|
|
/// function and records where the body of the function is in the bytecode
|
|
/// buffer. The caller can then use the ParseNextFunction and
|
|
/// ParseAllFunctionBodies to get handler events for the functions.
|
|
void BytecodeReader::ParseFunctionLazily() {
|
|
if (FunctionSignatureList.empty())
|
|
error("FunctionSignatureList empty!");
|
|
|
|
Function *Func = FunctionSignatureList.back();
|
|
FunctionSignatureList.pop_back();
|
|
|
|
// Save the information for future reading of the function
|
|
LazyFunctionLoadMap[Func] = LazyFunctionInfo(BlockStart, BlockEnd);
|
|
|
|
// This function has a body but it's not loaded so it appears `External'.
|
|
// Mark it as a `Ghost' instead to notify the users that it has a body.
|
|
Func->setLinkage(GlobalValue::GhostLinkage);
|
|
|
|
// Pretend we've `parsed' this function
|
|
At = BlockEnd;
|
|
}
|
|
|
|
/// The ParserFunction method lazily parses one function. Use this method to
|
|
/// casue the parser to parse a specific function in the module. Note that
|
|
/// this will remove the function from what is to be included by
|
|
/// ParseAllFunctionBodies.
|
|
/// @see ParseAllFunctionBodies
|
|
/// @see ParseBytecode
|
|
bool BytecodeReader::ParseFunction(Function* Func, std::string* ErrMsg) {
|
|
|
|
if (setjmp(context)) {
|
|
// Set caller's error message, if requested
|
|
if (ErrMsg)
|
|
*ErrMsg = ErrorMsg;
|
|
// Indicate an error occurred
|
|
return true;
|
|
}
|
|
|
|
// Find {start, end} pointers and slot in the map. If not there, we're done.
|
|
LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.find(Func);
|
|
|
|
// Make sure we found it
|
|
if (Fi == LazyFunctionLoadMap.end()) {
|
|
error("Unrecognized function of type " + Func->getType()->getDescription());
|
|
return true;
|
|
}
|
|
|
|
BlockStart = At = Fi->second.Buf;
|
|
BlockEnd = Fi->second.EndBuf;
|
|
assert(Fi->first == Func && "Found wrong function?");
|
|
|
|
LazyFunctionLoadMap.erase(Fi);
|
|
|
|
this->ParseFunctionBody(Func);
|
|
return false;
|
|
}
|
|
|
|
/// The ParseAllFunctionBodies method parses through all the previously
|
|
/// unparsed functions in the bytecode file. If you want to completely parse
|
|
/// a bytecode file, this method should be called after Parsebytecode because
|
|
/// Parsebytecode only records the locations in the bytecode file of where
|
|
/// the function definitions are located. This function uses that information
|
|
/// to materialize the functions.
|
|
/// @see ParseBytecode
|
|
bool BytecodeReader::ParseAllFunctionBodies(std::string* ErrMsg) {
|
|
if (setjmp(context)) {
|
|
// Set caller's error message, if requested
|
|
if (ErrMsg)
|
|
*ErrMsg = ErrorMsg;
|
|
// Indicate an error occurred
|
|
return true;
|
|
}
|
|
|
|
LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.begin();
|
|
LazyFunctionMap::iterator Fe = LazyFunctionLoadMap.end();
|
|
|
|
while (Fi != Fe) {
|
|
Function* Func = Fi->first;
|
|
BlockStart = At = Fi->second.Buf;
|
|
BlockEnd = Fi->second.EndBuf;
|
|
ParseFunctionBody(Func);
|
|
++Fi;
|
|
}
|
|
LazyFunctionLoadMap.clear();
|
|
return false;
|
|
}
|
|
|
|
/// Parse the global type list
|
|
void BytecodeReader::ParseGlobalTypes() {
|
|
// Read the number of types
|
|
unsigned NumEntries = read_vbr_uint();
|
|
ParseTypes(ModuleTypes, NumEntries);
|
|
}
|
|
|
|
/// Parse the Global info (types, global vars, constants)
|
|
void BytecodeReader::ParseModuleGlobalInfo() {
|
|
|
|
if (Handler) Handler->handleModuleGlobalsBegin();
|
|
|
|
// SectionID - If a global has an explicit section specified, this map
|
|
// remembers the ID until we can translate it into a string.
|
|
std::map<GlobalValue*, unsigned> SectionID;
|
|
|
|
// Read global variables...
|
|
unsigned VarType = read_vbr_uint();
|
|
while (VarType != Type::VoidTyID) { // List is terminated by Void
|
|
// VarType Fields: bit0 = isConstant, bit1 = hasInitializer, bit2,3,4 =
|
|
// Linkage, bit4+ = slot#
|
|
unsigned SlotNo = VarType >> 5;
|
|
unsigned LinkageID = (VarType >> 2) & 7;
|
|
unsigned VisibilityID = 0;
|
|
bool isConstant = VarType & 1;
|
|
bool hasInitializer = (VarType & 2) != 0;
|
|
unsigned Alignment = 0;
|
|
unsigned GlobalSectionID = 0;
|
|
|
|
// An extension word is present when linkage = 3 (internal) and hasinit = 0.
|
|
if (LinkageID == 3 && !hasInitializer) {
|
|
unsigned ExtWord = read_vbr_uint();
|
|
// The extension word has this format: bit 0 = has initializer, bit 1-3 =
|
|
// linkage, bit 4-8 = alignment (log2), bit 9 = has section,
|
|
// bits 10-12 = visibility, bits 13+ = future use.
|
|
hasInitializer = ExtWord & 1;
|
|
LinkageID = (ExtWord >> 1) & 7;
|
|
Alignment = (1 << ((ExtWord >> 4) & 31)) >> 1;
|
|
VisibilityID = (ExtWord >> 10) & 7;
|
|
|
|
if (ExtWord & (1 << 9)) // Has a section ID.
|
|
GlobalSectionID = read_vbr_uint();
|
|
}
|
|
|
|
GlobalValue::LinkageTypes Linkage;
|
|
switch (LinkageID) {
|
|
case 0: Linkage = GlobalValue::ExternalLinkage; break;
|
|
case 1: Linkage = GlobalValue::WeakLinkage; break;
|
|
case 2: Linkage = GlobalValue::AppendingLinkage; break;
|
|
case 3: Linkage = GlobalValue::InternalLinkage; break;
|
|
case 4: Linkage = GlobalValue::LinkOnceLinkage; break;
|
|
case 5: Linkage = GlobalValue::DLLImportLinkage; break;
|
|
case 6: Linkage = GlobalValue::DLLExportLinkage; break;
|
|
case 7: Linkage = GlobalValue::ExternalWeakLinkage; break;
|
|
default:
|
|
error("Unknown linkage type: " + utostr(LinkageID));
|
|
Linkage = GlobalValue::InternalLinkage;
|
|
break;
|
|
}
|
|
GlobalValue::VisibilityTypes Visibility;
|
|
switch (VisibilityID) {
|
|
case 0: Visibility = GlobalValue::DefaultVisibility; break;
|
|
case 1: Visibility = GlobalValue::HiddenVisibility; break;
|
|
default:
|
|
error("Unknown visibility type: " + utostr(VisibilityID));
|
|
Visibility = GlobalValue::DefaultVisibility;
|
|
break;
|
|
}
|
|
|
|
const Type *Ty = getType(SlotNo);
|
|
if (!Ty)
|
|
error("Global has no type! SlotNo=" + utostr(SlotNo));
|
|
|
|
if (!isa<PointerType>(Ty))
|
|
error("Global not a pointer type! Ty= " + Ty->getDescription());
|
|
|
|
const Type *ElTy = cast<PointerType>(Ty)->getElementType();
|
|
|
|
// Create the global variable...
|
|
GlobalVariable *GV = new GlobalVariable(ElTy, isConstant, Linkage,
|
|
0, "", TheModule);
|
|
GV->setAlignment(Alignment);
|
|
GV->setVisibility(Visibility);
|
|
insertValue(GV, SlotNo, ModuleValues);
|
|
|
|
if (GlobalSectionID != 0)
|
|
SectionID[GV] = GlobalSectionID;
|
|
|
|
unsigned initSlot = 0;
|
|
if (hasInitializer) {
|
|
initSlot = read_vbr_uint();
|
|
GlobalInits.push_back(std::make_pair(GV, initSlot));
|
|
}
|
|
|
|
// Notify handler about the global value.
|
|
if (Handler)
|
|
Handler->handleGlobalVariable(ElTy, isConstant, Linkage, Visibility,
|
|
SlotNo, initSlot);
|
|
|
|
// Get next item
|
|
VarType = read_vbr_uint();
|
|
}
|
|
|
|
// Read the function objects for all of the functions that are coming
|
|
unsigned FnSignature = read_vbr_uint();
|
|
|
|
// List is terminated by VoidTy.
|
|
while (((FnSignature & (~0U >> 1)) >> 5) != Type::VoidTyID) {
|
|
const Type *Ty = getType((FnSignature & (~0U >> 1)) >> 5);
|
|
if (!isa<PointerType>(Ty) ||
|
|
!isa<FunctionType>(cast<PointerType>(Ty)->getElementType())) {
|
|
error("Function not a pointer to function type! Ty = " +
|
|
Ty->getDescription());
|
|
}
|
|
|
|
// We create functions by passing the underlying FunctionType to create...
|
|
const FunctionType* FTy =
|
|
cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
|
|
|
|
// Insert the place holder.
|
|
Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
|
|
"", TheModule);
|
|
|
|
insertValue(Func, (FnSignature & (~0U >> 1)) >> 5, ModuleValues);
|
|
|
|
// Flags are not used yet.
|
|
unsigned Flags = FnSignature & 31;
|
|
|
|
// Save this for later so we know type of lazily instantiated functions.
|
|
// Note that known-external functions do not have FunctionInfo blocks, so we
|
|
// do not add them to the FunctionSignatureList.
|
|
if ((Flags & (1 << 4)) == 0)
|
|
FunctionSignatureList.push_back(Func);
|
|
|
|
// Get the calling convention from the low bits.
|
|
unsigned CC = Flags & 15;
|
|
unsigned Alignment = 0;
|
|
if (FnSignature & (1 << 31)) { // Has extension word?
|
|
unsigned ExtWord = read_vbr_uint();
|
|
Alignment = (1 << (ExtWord & 31)) >> 1;
|
|
CC |= ((ExtWord >> 5) & 15) << 4;
|
|
|
|
if (ExtWord & (1 << 10)) // Has a section ID.
|
|
SectionID[Func] = read_vbr_uint();
|
|
|
|
// Parse external declaration linkage
|
|
switch ((ExtWord >> 11) & 3) {
|
|
case 0: break;
|
|
case 1: Func->setLinkage(Function::DLLImportLinkage); break;
|
|
case 2: Func->setLinkage(Function::ExternalWeakLinkage); break;
|
|
default: assert(0 && "Unsupported external linkage");
|
|
}
|
|
}
|
|
|
|
Func->setCallingConv(CC-1);
|
|
Func->setAlignment(Alignment);
|
|
|
|
if (Handler) Handler->handleFunctionDeclaration(Func);
|
|
|
|
// Get the next function signature.
|
|
FnSignature = read_vbr_uint();
|
|
}
|
|
|
|
// Now that the function signature list is set up, reverse it so that we can
|
|
// remove elements efficiently from the back of the vector.
|
|
std::reverse(FunctionSignatureList.begin(), FunctionSignatureList.end());
|
|
|
|
/// SectionNames - This contains the list of section names encoded in the
|
|
/// moduleinfoblock. Functions and globals with an explicit section index
|
|
/// into this to get their section name.
|
|
std::vector<std::string> SectionNames;
|
|
|
|
// Read in the dependent library information.
|
|
unsigned num_dep_libs = read_vbr_uint();
|
|
std::string dep_lib;
|
|
while (num_dep_libs--) {
|
|
dep_lib = read_str();
|
|
TheModule->addLibrary(dep_lib);
|
|
if (Handler)
|
|
Handler->handleDependentLibrary(dep_lib);
|
|
}
|
|
|
|
// Read target triple and place into the module.
|
|
std::string triple = read_str();
|
|
TheModule->setTargetTriple(triple);
|
|
if (Handler)
|
|
Handler->handleTargetTriple(triple);
|
|
|
|
// Read the data layout string and place into the module.
|
|
std::string datalayout = read_str();
|
|
TheModule->setDataLayout(datalayout);
|
|
// FIXME: Implement
|
|
// if (Handler)
|
|
// Handler->handleDataLayout(datalayout);
|
|
|
|
if (At != BlockEnd) {
|
|
// If the file has section info in it, read the section names now.
|
|
unsigned NumSections = read_vbr_uint();
|
|
while (NumSections--)
|
|
SectionNames.push_back(read_str());
|
|
}
|
|
|
|
// If the file has module-level inline asm, read it now.
|
|
if (At != BlockEnd)
|
|
TheModule->setModuleInlineAsm(read_str());
|
|
|
|
// If any globals are in specified sections, assign them now.
|
|
for (std::map<GlobalValue*, unsigned>::iterator I = SectionID.begin(), E =
|
|
SectionID.end(); I != E; ++I)
|
|
if (I->second) {
|
|
if (I->second > SectionID.size())
|
|
error("SectionID out of range for global!");
|
|
I->first->setSection(SectionNames[I->second-1]);
|
|
}
|
|
|
|
// This is for future proofing... in the future extra fields may be added that
|
|
// we don't understand, so we transparently ignore them.
|
|
//
|
|
At = BlockEnd;
|
|
|
|
if (Handler) Handler->handleModuleGlobalsEnd();
|
|
}
|
|
|
|
/// Parse the version information and decode it by setting flags on the
|
|
/// Reader that enable backward compatibility of the reader.
|
|
void BytecodeReader::ParseVersionInfo() {
|
|
unsigned RevisionNum = read_vbr_uint();
|
|
|
|
// We don't provide backwards compatibility in the Reader any more. To
|
|
// upgrade, the user should use llvm-upgrade.
|
|
if (RevisionNum < 7)
|
|
error("Bytecode formats < 7 are no longer supported. Use llvm-upgrade.");
|
|
|
|
if (Handler) Handler->handleVersionInfo(RevisionNum);
|
|
}
|
|
|
|
/// Parse a whole module.
|
|
void BytecodeReader::ParseModule() {
|
|
unsigned Type, Size;
|
|
|
|
FunctionSignatureList.clear(); // Just in case...
|
|
|
|
// Read into instance variables...
|
|
ParseVersionInfo();
|
|
|
|
bool SeenModuleGlobalInfo = false;
|
|
bool SeenGlobalTypePlane = false;
|
|
BufPtr MyEnd = BlockEnd;
|
|
while (At < MyEnd) {
|
|
BufPtr OldAt = At;
|
|
read_block(Type, Size);
|
|
|
|
switch (Type) {
|
|
|
|
case BytecodeFormat::GlobalTypePlaneBlockID:
|
|
if (SeenGlobalTypePlane)
|
|
error("Two GlobalTypePlane Blocks Encountered!");
|
|
|
|
if (Size > 0)
|
|
ParseGlobalTypes();
|
|
SeenGlobalTypePlane = true;
|
|
break;
|
|
|
|
case BytecodeFormat::ModuleGlobalInfoBlockID:
|
|
if (SeenModuleGlobalInfo)
|
|
error("Two ModuleGlobalInfo Blocks Encountered!");
|
|
ParseModuleGlobalInfo();
|
|
SeenModuleGlobalInfo = true;
|
|
break;
|
|
|
|
case BytecodeFormat::ConstantPoolBlockID:
|
|
ParseConstantPool(ModuleValues, ModuleTypes,false);
|
|
break;
|
|
|
|
case BytecodeFormat::FunctionBlockID:
|
|
ParseFunctionLazily();
|
|
break;
|
|
|
|
case BytecodeFormat::ValueSymbolTableBlockID:
|
|
ParseValueSymbolTable(0, &TheModule->getValueSymbolTable());
|
|
break;
|
|
|
|
case BytecodeFormat::TypeSymbolTableBlockID:
|
|
ParseTypeSymbolTable(&TheModule->getTypeSymbolTable());
|
|
break;
|
|
|
|
default:
|
|
At += Size;
|
|
if (OldAt > At) {
|
|
error("Unexpected Block of Type #" + utostr(Type) + " encountered!");
|
|
}
|
|
break;
|
|
}
|
|
BlockEnd = MyEnd;
|
|
}
|
|
|
|
// After the module constant pool has been read, we can safely initialize
|
|
// global variables...
|
|
while (!GlobalInits.empty()) {
|
|
GlobalVariable *GV = GlobalInits.back().first;
|
|
unsigned Slot = GlobalInits.back().second;
|
|
GlobalInits.pop_back();
|
|
|
|
// Look up the initializer value...
|
|
// FIXME: Preserve this type ID!
|
|
|
|
const llvm::PointerType* GVType = GV->getType();
|
|
unsigned TypeSlot = getTypeSlot(GVType->getElementType());
|
|
if (Constant *CV = getConstantValue(TypeSlot, Slot)) {
|
|
if (GV->hasInitializer())
|
|
error("Global *already* has an initializer?!");
|
|
if (Handler) Handler->handleGlobalInitializer(GV,CV);
|
|
GV->setInitializer(CV);
|
|
} else
|
|
error("Cannot find initializer value.");
|
|
}
|
|
|
|
if (!ConstantFwdRefs.empty())
|
|
error("Use of undefined constants in a module");
|
|
|
|
/// Make sure we pulled them all out. If we didn't then there's a declaration
|
|
/// but a missing body. That's not allowed.
|
|
if (!FunctionSignatureList.empty())
|
|
error("Function declared, but bytecode stream ended before definition");
|
|
}
|
|
|
|
/// This function completely parses a bytecode buffer given by the \p Buf
|
|
/// and \p Length parameters.
|
|
bool BytecodeReader::ParseBytecode(volatile BufPtr Buf, unsigned Length,
|
|
const std::string &ModuleID,
|
|
std::string* ErrMsg) {
|
|
|
|
/// We handle errors by
|
|
if (setjmp(context)) {
|
|
// Cleanup after error
|
|
if (Handler) Handler->handleError(ErrorMsg);
|
|
freeState();
|
|
delete TheModule;
|
|
TheModule = 0;
|
|
if (decompressedBlock != 0 ) {
|
|
::free(decompressedBlock);
|
|
decompressedBlock = 0;
|
|
}
|
|
// Set caller's error message, if requested
|
|
if (ErrMsg)
|
|
*ErrMsg = ErrorMsg;
|
|
// Indicate an error occurred
|
|
return true;
|
|
}
|
|
|
|
RevisionNum = 0;
|
|
At = MemStart = BlockStart = Buf;
|
|
MemEnd = BlockEnd = Buf + Length;
|
|
|
|
// Create the module
|
|
TheModule = new Module(ModuleID);
|
|
|
|
if (Handler) Handler->handleStart(TheModule, Length);
|
|
|
|
// Read the four bytes of the signature.
|
|
unsigned Sig = read_uint();
|
|
|
|
// If this is a compressed file
|
|
if (Sig == ('l' | ('l' << 8) | ('v' << 16) | ('c' << 24))) {
|
|
|
|
// Invoke the decompression of the bytecode. Note that we have to skip the
|
|
// file's magic number which is not part of the compressed block. Hence,
|
|
// the Buf+4 and Length-4. The result goes into decompressedBlock, a data
|
|
// member for retention until BytecodeReader is destructed.
|
|
unsigned decompressedLength = Compressor::decompressToNewBuffer(
|
|
(char*)Buf+4,Length-4,decompressedBlock);
|
|
|
|
// We must adjust the buffer pointers used by the bytecode reader to point
|
|
// into the new decompressed block. After decompression, the
|
|
// decompressedBlock will point to a contiguous memory area that has
|
|
// the decompressed data.
|
|
At = MemStart = BlockStart = Buf = (BufPtr) decompressedBlock;
|
|
MemEnd = BlockEnd = Buf + decompressedLength;
|
|
|
|
// else if this isn't a regular (uncompressed) bytecode file, then its
|
|
// and error, generate that now.
|
|
} else if (Sig != ('l' | ('l' << 8) | ('v' << 16) | ('m' << 24))) {
|
|
error("Invalid bytecode signature: " + utohexstr(Sig));
|
|
}
|
|
|
|
// Tell the handler we're starting a module
|
|
if (Handler) Handler->handleModuleBegin(ModuleID);
|
|
|
|
// Get the module block and size and verify. This is handled specially
|
|
// because the module block/size is always written in long format. Other
|
|
// blocks are written in short format so the read_block method is used.
|
|
unsigned Type, Size;
|
|
Type = read_uint();
|
|
Size = read_uint();
|
|
if (Type != BytecodeFormat::ModuleBlockID) {
|
|
error("Expected Module Block! Type:" + utostr(Type) + ", Size:"
|
|
+ utostr(Size));
|
|
}
|
|
|
|
// It looks like the darwin ranlib program is broken, and adds trailing
|
|
// garbage to the end of some bytecode files. This hack allows the bc
|
|
// reader to ignore trailing garbage on bytecode files.
|
|
if (At + Size < MemEnd)
|
|
MemEnd = BlockEnd = At+Size;
|
|
|
|
if (At + Size != MemEnd)
|
|
error("Invalid Top Level Block Length! Type:" + utostr(Type)
|
|
+ ", Size:" + utostr(Size));
|
|
|
|
// Parse the module contents
|
|
this->ParseModule();
|
|
|
|
// Check for missing functions
|
|
if (hasFunctions())
|
|
error("Function expected, but bytecode stream ended!");
|
|
|
|
// Tell the handler we're done with the module
|
|
if (Handler)
|
|
Handler->handleModuleEnd(ModuleID);
|
|
|
|
// Tell the handler we're finished the parse
|
|
if (Handler) Handler->handleFinish();
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//=== Default Implementations of Handler Methods
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
BytecodeHandler::~BytecodeHandler() {}
|
|
|