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Fixed a LONG standing, SCARY problem with bytecode encoding. It turns out to be an endian problem that only shows up with type 0 instructions in LARGE programs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@961 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-10-23 03:21:10 +00:00
parent e638c10cb0
commit 2b9f6004df
3 changed files with 65 additions and 41 deletions
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48
lib/Bytecode/Reader/InstructionReader.cpp
View File

@ -22,30 +22,53 @@ bool BytecodeParser::ParseRawInst(const uchar *&Buf, const uchar *EndBuf,
unsigned Op, Typ;
if (read(Buf, EndBuf, Op)) return failure(true);
Result.NumOperands = Op >> 30;
Result.Opcode = (Op >> 24) & 63;
// bits Instruction format: Common to all formats
// --------------------------
// 01-00: Opcode type, fixed to 1.
// 07-02: Opcode
Result.NumOperands = (Op >> 0) & 03;
Result.Opcode = (Op >> 2) & 63;
switch (Result.NumOperands) {
case 1:
Result.Ty = getType((Op >> 12) & 4095);
Result.Arg1 = Op & 4095;
// bits Instruction format:
// --------------------------
// 19-08: Resulting type plane
// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
//
Result.Ty = getType((Op >> 8) & 4095);
Result.Arg1 = (Op >> 20) & 4095;
if (Result.Arg1 == 4095) // Handle special encoding for 0 operands...
Result.NumOperands = 0;
break;
case 2:
Result.Ty = getType((Op >> 16) & 255);
Result.Arg1 = (Op >> 8 ) & 255;
Result.Arg2 = (Op >> 0 ) & 255;
// bits Instruction format:
// --------------------------
// 15-08: Resulting type plane
// 23-16: Operand #1
// 31-24: Operand #2
//
Result.Ty = getType((Op >> 8) & 255);
Result.Arg1 = (Op >> 16) & 255;
Result.Arg2 = (Op >> 24) & 255;
break;
case 3:
Result.Ty = getType((Op >> 18) & 63);
Result.Arg1 = (Op >> 12) & 63;
Result.Arg2 = (Op >> 6 ) & 63;
Result.Arg3 = (Op >> 0 ) & 63;
// bits Instruction format:
// --------------------------
// 13-08: Resulting type plane
// 19-14: Operand #1
// 25-20: Operand #2
// 31-26: Operand #3
//
Result.Ty = getType((Op >> 8) & 63);
Result.Arg1 = (Op >> 14) & 63;
Result.Arg2 = (Op >> 20) & 63;
Result.Arg3 = (Op >> 26) & 63;
break;
case 0:
Buf -= 4; // Hrm, try this again...
if (read_vbr(Buf, EndBuf, Result.Opcode)) return failure(true);
Result.Opcode >>= 2;
if (read_vbr(Buf, EndBuf, Typ)) return failure(true);
Result.Ty = getType(Typ);
if (Result.Ty == 0) return failure(true);
@ -93,7 +116,8 @@ bool BytecodeParser::ParseRawInst(const uchar *&Buf, const uchar *EndBuf,
bool BytecodeParser::ParseInstruction(const uchar *&Buf, const uchar *EndBuf,
Instruction *&Res) {
RawInst Raw;
if (ParseRawInst(Buf, EndBuf, Raw)) return failure(true);
if (ParseRawInst(Buf, EndBuf, Raw))
return failure(true);
if (Raw.Opcode >= Instruction::FirstUnaryOp &&
Raw.Opcode < Instruction::NumUnaryOps && Raw.NumOperands == 1) {

2
lib/Bytecode/Reader/ReaderInternals.h
View File

@ -16,7 +16,7 @@
#include <list>
// Enable to trace to figure out what the heck is going on when parsing fails
#define TRACE_LEVEL 0
#define TRACE_LEVEL 10
#if TRACE_LEVEL // ByteCodeReading_TRACEer
#include "llvm/Assembly/Writer.h"

56
lib/Bytecode/Writer/InstructionWriter.cpp
View File

@ -30,7 +30,7 @@ static void outputInstructionFormat0(const Instruction *I,
const SlotCalculator &Table,
unsigned Type, deque<uchar> &Out) {
// Opcode must have top two bits clear...
output_vbr(I->getOpcode(), Out); // Instruction Opcode ID
output_vbr(I->getOpcode() << 2, Out); // Instruction Opcode ID
output_vbr(Type, Out); // Result type
unsigned NumArgs = I->getNumOperands();
@ -66,7 +66,7 @@ static void outputInstrVarArgsCall(const Instruction *I,
deque<uchar> &Out) {
assert(isa<CallInst>(I) || isa<InvokeInst>(I));
// Opcode must have top two bits clear...
output_vbr(I->getOpcode(), Out); // Instruction Opcode ID
output_vbr(I->getOpcode() << 2, Out); // Instruction Opcode ID
output_vbr(Type, Out); // Result type (varargs type)
unsigned NumArgs = I->getNumOperands();
@ -107,18 +107,18 @@ static void outputInstrVarArgsCall(const Instruction *I,
static void outputInstructionFormat1(const Instruction *I,
const SlotCalculator &Table, int *Slots,
unsigned Type, deque<uchar> &Out) {
unsigned IType = I->getOpcode(); // Instruction Opcode ID
unsigned Opcode = I->getOpcode(); // Instruction Opcode ID
// bits Instruction format:
// --------------------------
// 31-30: Opcode type, fixed to 1.
// 29-24: Opcode
// 23-12: Resulting type plane
// 11- 0: Operand #1 (if set to (2^12-1), then zero operands)
// 01-00: Opcode type, fixed to 1.
// 07-02: Opcode
// 19-08: Resulting type plane
// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
//
unsigned Opcode = (1 << 30) | (IType << 24) | (Type << 12) | Slots[0];
unsigned Bits = 1 | (Opcode << 2) | (Type << 8) | (Slots[0] << 20);
// cerr << "1 " << IType << " " << Type << " " << Slots[0] << endl;
output(Opcode, Out);
output(Bits, Out);
}
@ -128,21 +128,21 @@ static void outputInstructionFormat1(const Instruction *I,
static void outputInstructionFormat2(const Instruction *I,
const SlotCalculator &Table, int *Slots,
unsigned Type, deque<uchar> &Out) {
unsigned IType = I->getOpcode(); // Instruction Opcode ID
unsigned Opcode = I->getOpcode(); // Instruction Opcode ID
// bits Instruction format:
// --------------------------
// 31-30: Opcode type, fixed to 2.
// 29-24: Opcode
// 23-16: Resulting type plane
// 15- 8: Operand #1
// 7- 0: Operand #2
// 01-00: Opcode type, fixed to 2.
// 07-02: Opcode
// 15-08: Resulting type plane
// 23-16: Operand #1
// 31-24: Operand #2
//
unsigned Opcode = (2 << 30) | (IType << 24) | (Type << 16) |
(Slots[0] << 8) | (Slots[1] << 0);
unsigned Bits = 2 | (Opcode << 2) | (Type << 8) |
(Slots[0] << 16) | (Slots[1] << 24);
// cerr << "2 " << IType << " " << Type << " " << Slots[0] << " "
// << Slots[1] << endl;
output(Opcode, Out);
output(Bits, Out);
}
@ -152,22 +152,22 @@ static void outputInstructionFormat2(const Instruction *I,
static void outputInstructionFormat3(const Instruction *I,
const SlotCalculator &Table, int *Slots,
unsigned Type, deque<uchar> &Out) {
unsigned IType = I->getOpcode(); // Instruction Opcode ID
unsigned Opcode = I->getOpcode(); // Instruction Opcode ID
// bits Instruction format:
// --------------------------
// 31-30: Opcode type, fixed to 3
// 29-24: Opcode
// 23-18: Resulting type plane
// 17-12: Operand #1
// 11- 6: Operand #2
// 5- 0: Operand #3
// 01-00: Opcode type, fixed to 3.
// 07-02: Opcode
// 13-08: Resulting type plane
// 19-14: Operand #1
// 25-20: Operand #2
// 31-26: Operand #3
//
unsigned Opcode = (3 << 30) | (IType << 24) | (Type << 18) |
(Slots[0] << 12) | (Slots[1] << 6) | (Slots[2] << 0);
unsigned Bits = 3 | (Opcode << 2) | (Type << 8) |
(Slots[0] << 14) | (Slots[1] << 20) | (Slots[2] << 26);
//cerr << "3 " << IType << " " << Type << " " << Slots[0] << " "
// << Slots[1] << " " << Slots[2] << endl;
output(Opcode, Out);
output(Bits, Out);
}
void BytecodeWriter::processInstruction(const Instruction *I) {