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/* Copyright (C) 2009 Matthew Fluet.
* Copyright (C) 2004-2008 Henry Cejtin, Matthew Fluet, Suresh
* Jagannathan, and Stephen Weeks.
*
* MLton is released under a BSD-style license.
* See the file MLton-LICENSE for details.
*/
#define MLTON_GC_INTERNAL_TYPES
#ifndef MLTON_CODEGEN_STATIC_INLINE
#define MLTON_CODEGEN_STATIC_INLINE static inline
#endif
/* No need to declare inlined math functions, since <math.h> comes
* with "platform.h".
*/
#ifndef MLTON_CODEGEN_MATHFN
#define MLTON_CODEGEN_MATHFN(decl)
#endif
/* WordS<N>_quot and WordS<N>_rem can be inlined with the
* bytecode-codegen, since they will be used in a context where the
* arguments are variables.
*/
#ifndef MLTON_CODEGEN_WORDSQUOTREM
#define MLTON_CODEGEN_WORDSQUOTREM(func) func
#endif
#ifndef MLTON_CODEGEN_WORDSQUOTREM_IMPL
#define MLTON_CODEGEN_WORDSQUOTREM_IMPL(func) func
#endif
/* No need to declare memcpy, since <string.h> comes with platform.h.
*/
#ifndef MLTON_CODEGEN_MEMCPY
#define MLTON_CODEGEN_MEMCPY(decl)
#endif
#include "platform.h"
#include "c-chunk.h" // c-chunk.h must come before opcode.h because it
// redefines some opcode symbols
#include "interpret.h"
#include "opcode.h"
enum {
DEBUG_BYTECODE = FALSE,
};
#if defined (GC_MODEL_NATIVE32)
#define WordPointer Word32
#define WordArrayIndex Word32
#elif defined (GC_MODEL_NATIVE64)
#define WordPointer Word64
#define WordArrayIndex Word64
#else
#error GC_MODEL_* undefined
#endif
typedef WordArrayIndex ArrayIndex;
typedef Word16 ArrayOffset;
typedef Word16 CallCIndex;
typedef Word16 GlobalIndex;
typedef uintptr_t Label;
typedef Int16 Offset; // Offset must be signed.
typedef Pointer ProgramCounter;
typedef Word16 RegIndex;
typedef Word8 Scale;
typedef Int16 StackOffset; // StackOffset must be signed.
PRIVATE extern struct GC_state gcState;
//----------------------------------------------------------------------
// Imports
//----------------------------------------------------------------------
#define regs(ty) \
int ty##RegI = 0; \
PRIVATE extern ty global##ty[]; \
static ty ty##VReg[1000]; \
ty ty##Reg[1000] = { 0 }
regs(CPointer);
regs(Objptr);
regs(Real32);
regs(Real64);
regs(Word8);
regs(Word16);
regs(Word32);
regs(Word64);
PRIVATE extern Objptr globalObjptrNonRoot[];
#undef regs
//
// Virtual Registers. Explicitly referenced by the Machine IL.
//
#define R(ty, i) (ty##VReg [i])
//----------------------------------------------------------------------
#define Fetch(t, z) \
do { \
z = *(t*)pc; \
if (DEBUG or DEBUG_BYTECODE or disassemble) { \
if (! strcmp(#z,"label")) \
fprintf (stderr, " %s", offsetToLabel[z]); \
else if (! strcmp(#z, "opc")) \
fprintf (stderr, " %d", (int)z); \
} \
pc += sizeof (t); \
} while (0)
enum {
MODE_load,
MODE_store,
};
#define maybe unless (disassemble)
#define StoreReg(t, z) maybe PushReg(t) = z
#define loadStoreGen(mode, t, t2, z) \
switch (MODE_##mode) { \
case MODE_load: \
StoreReg (t2, (t2)z); \
break; \
case MODE_store: \
maybe z = (t) (PopReg (t2)); \
break; \
default: \
assert (FALSE); \
}
#define loadStore(mode, t, z) loadStoreGen(mode, t, t, z)
#define loadStoreArrayOffset(mode, ty) \
case opcodeSymOfTy2 (ty, mode##ArrayOffset): \
{ \
ArrayOffset arrayOffset; \
Pointer arrayBase; \
ArrayIndex arrayIndex; \
Scale arrayScale; \
Fetch (ArrayOffset, arrayOffset); \
Fetch (Scale, arrayScale); \
if (disassemble) goto mainLoop; \
arrayIndex = PopRegX (WordArrayIndex); \
arrayBase = (Pointer) (PopRegX (WordPointer)); \
loadStore (mode, ty, \
*(ty*)(arrayBase + (arrayIndex * arrayScale) + arrayOffset)); \
goto mainLoop; \
}
#define loadStoreContents(mode, ty) \
case opcodeSymOfTy2 (ty, mode##Contents): \
if (disassemble) goto mainLoop; \
{ \
Pointer base; \
base = (Pointer) (PopRegX (WordPointer)); \
loadStore (mode, ty, C (ty, base)); \
goto mainLoop; \
}
#define loadStoreFrontier(mode) \
case opcodeSym (mode##Frontier): \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, Pointer, WordPointer, Frontier); \
goto mainLoop;
#define loadGCState() \
case opcodeSym (loadGCState): \
if (disassemble) goto mainLoop; \
StoreReg (WordPointer, (WordPointer)&gcState); \
goto mainLoop;
#define loadStoreGlobal(mode, ty) \
case opcodeSymOfTy2 (ty, mode##Global): \
{ \
GlobalIndex globalIndex; \
Fetch (GlobalIndex, globalIndex); \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, ty, ty, G (ty, globalIndex)); \
goto mainLoop; \
}
#define loadStoreGlobalPointer(mode, ty) \
case opcodeSymOfTy2 (ty, mode##Global): \
{ \
GlobalIndex globalIndex; \
Fetch (GlobalIndex, globalIndex); \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, ty, WordPointer, G (ty, globalIndex)); \
goto mainLoop; \
}
#define loadStoreGPNR(mode) \
case opcodeSym (mode##GPNR): \
{ \
GlobalIndex globalIndex; \
Fetch (GlobalIndex, globalIndex); \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, Objptr, WordPointer, GPNR (globalIndex)); \
goto mainLoop; \
}
#define loadStoreOffset(mode, ty) \
case opcodeSymOfTy2 (ty, mode##Offset): \
{ \
Pointer base; \
Offset offset; \
Fetch (Offset, offset); \
if (disassemble) goto mainLoop; \
base = (Pointer) (PopRegX (WordPointer)); \
maybe loadStore (mode, ty, O (ty, base, offset)); \
goto mainLoop; \
}
#define loadStoreRegister(mode, ty) \
case opcodeSymOfTy2 (ty, mode##Register): \
{ \
RegIndex regIndex; \
Fetch (RegIndex, regIndex); \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, ty, ty, R (ty, regIndex)); \
goto mainLoop; \
}
#define loadStoreRegisterPointer(mode, ty) \
case opcodeSymOfTy2 (ty, mode##Register): \
{ \
RegIndex regIndex; \
Fetch (RegIndex, regIndex); \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, ty, WordPointer, R (ty, regIndex)); \
goto mainLoop; \
}
#define loadStoreStackOffset(mode, ty) \
case opcodeSymOfTy2 (ty, mode##StackOffset): \
{ \
StackOffset stackOffset; \
Fetch (StackOffset, stackOffset); \
if (disassemble) goto mainLoop; \
loadStore (mode, ty, S (ty, stackOffset)); \
goto mainLoop; \
}
#define loadStoreStackTop(mode) \
case opcodeSym (mode##StackTop): \
if (disassemble) goto mainLoop; \
loadStoreGen (mode, Pointer, WordPointer, StackTop); \
goto mainLoop;
#define loadWord(size) \
case opcodeSymOfTy (Word, size, loadWord): \
{ \
Word##size t0; \
Fetch (Word##size, t0); \
if (disassemble) goto mainLoop; \
loadStore (load, Word##size, t0); \
goto mainLoop; \
}
#define binary(ty, f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
ty t0 = PopReg (ty); \
ty t1 = PopReg (ty); \
PushReg (ty) = f (t0, t1); \
goto mainLoop; \
}
/* The bytecode interpreter relies on the fact that the overflow checking
* primitives implemented in c-chunk.h only set the result if the operation does
* not overflow. When the result overflow, the interpreter pushes a zero on
* the stack for the result.
*/
#define binaryCheck(ty, f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
ty t0 = PopReg (ty); \
ty t1 = PopReg (ty); \
f (PushReg (ty), t0, t1, f##Overflow); \
overflow = FALSE; \
goto mainLoop; \
f##Overflow: \
PushReg (ty) = 0; /* overflow, push 0 */ \
overflow = TRUE; \
goto mainLoop; \
}
#define coerceOp(n, f, t) opcodeSym (f##_##n##To##t)
#define coerce(n, f1, t1, f2, t2) \
case coerceOp (n, f2, t2): \
if (disassemble) goto mainLoop; \
{ \
f1 t0 = PopReg (f1); \
PushReg (t1) = f2##_##n##To##t2 (t0); \
goto mainLoop; \
}
#define compare(ty, f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
ty t0 = PopReg (ty); \
ty t1 = PopReg (ty); \
PushReg (Word32) = f (t0, t1); \
goto mainLoop; \
}
#define cpointerBinary(f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
Pointer t0; \
t0 = (Pointer) (PopRegX (WordPointer)); \
WordPointer t1 = PopRegX (WordPointer); \
Pointer t2 = f (t0, t1); \
PushRegX (WordPointer) = (WordPointer) t2; \
goto mainLoop; \
}
#define cpointerCompare(f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
Pointer t0, t1; \
t0 = (Pointer) (PopRegX (WordPointer)); \
t1 = (Pointer) (PopRegX (WordPointer)); \
PushReg (Word32) = f (t0, t1); \
goto mainLoop; \
}
#define cpointerCoerceFrom(f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
WordPointer t0 = PopRegX (WordPointer); \
Pointer t1 = f (t0); \
PushRegX (WordPointer) = (WordPointer) t1; \
goto mainLoop; \
}
#define cpointerCoerceTo(f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
Pointer t0; \
t0 = (Pointer) (PopRegX (WordPointer)); \
PushRegX (WordPointer) = f (t0); \
goto mainLoop; \
}
#define cpointerDiff(f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
Pointer t0, t1; \
t0 = (Pointer) (PopRegX (WordPointer)); \
t1 = (Pointer) (PopRegX (WordPointer)); \
PushRegX (WordPointer) = f (t0, t1); \
goto mainLoop; \
}
#define cpointerLoadWord(f) \
case opcodeSym (f): \
{ \
size_t t0; \
Fetch (WordPointer, t0); \
if (disassemble) goto mainLoop; \
StoreReg (CPointer, (CPointer)t0); \
goto mainLoop; \
}
#define shift(ty, f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
ty w = PopReg (ty); \
Word32 s = PopReg (Word32); \
ty w2 = f (w, s); \
PushReg (ty) = w2; \
goto mainLoop; \
}
#define unary(ty, f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
ty t0 = PopReg (ty); \
PushReg (ty) = f (t0); \
goto mainLoop; \
}
/* The bytecode interpreter relies on the fact that the overflow checking
* primitives implemented in c-chunk.h only set the result if the operation does
* not overflow. When the result overflow, the interpreter pushes a zero on
* the stack for the result.
*/
#define unaryCheck(ty, f) \
case opcodeSym (f): \
if (disassemble) goto mainLoop; \
{ \
ty t0 = PopReg (ty); \
f (PushReg (ty), t0, f##Overflow); \
overflow = FALSE; \
goto mainLoop; \
f##Overflow: \
PushReg (ty) = 0; /* overflow, push 0 */ \
overflow = TRUE; \
goto mainLoop; \
}
#define Goto(l) \
do { \
maybe pc = code + l; \
goto mainLoop; \
} while (0)
#define Switch(size) \
case OPCODE_Switch##size: \
{ \
Label label; \
ProgramCounter lastCase; \
Word##size test = 0; \
Word16 numCases; \
\
Fetch (Word16, numCases); \
if (sizeof(Label) == 4) { \
lastCase = pc + (4 + size/8) * numCases; \
} else if (sizeof(Label) == 8) { \
lastCase = pc + (8 + size/8) * numCases; \
} else { assert (FALSE); } \
maybe test = PopReg (Word##size); \
assertRegsEmpty (); \
while (pc < lastCase) { \
Word##size caseWord; \
if (DEBUG or DEBUG_BYTECODE or disassemble) \
fprintf (stderr, "\n\t "); \
Fetch (Word##size, caseWord); \
if (DEBUG or DEBUG_BYTECODE or disassemble) \
fprintf (stderr, " =>"); \
Fetch (Label, label); \
if (not disassemble and test == caseWord) \
Goto (label); \
} \
goto mainLoop; \
}
typedef char *String;
#undef CacheFrontier
#undef CacheStackTop
#undef FlushFrontier
#undef FlushStackTop
#define CacheFrontier() \
do { \
frontier = (Pointer)(gcState.frontier); \
} while (0)
#define CacheStackTop() \
do { \
stackTop = (Pointer)(gcState.stackTop); \
} while (0)
#define FlushFrontier() \
do { \
gcState.frontier = (pointer)frontier; \
} while (0)
#define FlushStackTop() \
do { \
gcState.stackTop = (pointer)stackTop; \
} while (0)
#define disp(ty,ty2,fmt) \
for (i = 0; i < ty##RegI; ++i) \
fprintf (stderr, "\n" #ty "Reg[%d] = "fmt, \
i, (ty2)(ty##Reg[i]))
static inline void displayRegs (void) {
int i;
disp (CPointer,uintptr_t,FMTPTR);
disp (Objptr,uintptr_t,FMTPTR);
disp (Word8,Word8,"0x%02"PRIx8);
disp (Word16,Word16,"0x%04"PRIx16);
disp (Word32,Word32,"0x%08"PRIx32);
disp (Word64,Word64,"0x%016"PRIx64);
disp (Real32,Real32,"%f");
disp (Real64,Real64,"%f");
}
static void interpret (Bytecode b, CodeOffset codeOffset, Bool disassemble) {
CallCIndex callCIndex;
Pointer code;
Pointer frontier;
unsigned int i;
String name;
String *offsetToLabel = NULL;
Opcode opc;
Bool overflow = FALSE;
ProgramCounter pc;
ProgramCounter pcMax;
Pointer stackTop;
code = b->code;
pcMax = b->code + b->codeSize;
if (DEBUG or DEBUG_BYTECODE or disassemble) {
offsetToLabel =
(String*)(calloc_safe (b->codeSize, sizeof(*offsetToLabel)));
for (i = 0; i < b->nameOffsetsSize; ++i)
offsetToLabel [b->nameOffsets[i].codeOffset] =
b->addressNames + b->nameOffsets[i].nameOffset;
}
if (disassemble)
pc = code;
else {
pc = code + codeOffset;
}
CacheFrontier ();
CacheStackTop ();
mainLoop:
if (DEBUG_BYTECODE)
displayRegs ();
if (DEBUG or DEBUG_BYTECODE or disassemble) {
if (pc == pcMax)
goto done;
name = offsetToLabel [pc - b->code];
unless (NULL == name)
fprintf (stderr, "\n%s:", name);
fprintf (stderr, "\n\t");
}
assert (code <= pc and pc < pcMax);
Fetch (Opcode, opc);
assert (opc < (cardof (opcodeStrings)));
if (DEBUG or DEBUG_BYTECODE or disassemble)
fprintf (stderr, "%s", opcodeStrings[opc]);
switch ((enum OpcodeEnum)opc) {
prims ();
case opcodeSym (CacheFrontier):
{
if (disassemble) goto mainLoop;
CacheFrontier ();
goto mainLoop;
}
case opcodeSym (FlushFrontier):
{
if (disassemble) goto mainLoop;
FlushFrontier ();
goto mainLoop;
}
case opcodeSym (CacheStackTop):
{
if (disassemble) goto mainLoop;
CacheStackTop ();
goto mainLoop;
}
case opcodeSym (FlushStackTop):
{
if (disassemble) goto mainLoop;
FlushStackTop ();
goto mainLoop;
}
case opcodeSym (BranchIfZero):
{
Label label;
Fetch (Label, label);
if (disassemble) goto mainLoop;
if (0 == PopReg (Word32))
Goto (label);
goto mainLoop;
}
case opcodeSym (CallC):
Fetch (CallCIndex, callCIndex);
unless (disassemble) {
FlushFrontier ();
FlushStackTop ();
MLton_callC (callCIndex);
CacheFrontier ();
CacheStackTop ();
}
goto mainLoop;
case opcodeSym (Goto):
{
Label label;
Fetch (Label, label);
Goto (label);
}
loadStoreGPNR(load);
loadStoreGPNR(store);
case opcodeSym (JumpOnOverflow):
{
Label label;
Fetch (Label, label);
if (overflow)
Goto (label);
goto mainLoop;
}
case opcodeSym (Raise):
maybe StackTop = (Pointer)(gcState.stackBottom + gcState.exnStack);
// fall through to Return.
case opcodeSym (Return):
Goto (*(Label*)(StackTop - sizeof (Label)));
Switch(8);
Switch(16);
Switch(32);
Switch(64);
case opcodeSym (Thread_returnToC):
if (disassemble) goto mainLoop;
FlushFrontier ();
FlushStackTop ();
goto done;
default:
assert (FALSE);
}
assert (FALSE);
done:
if (DEBUG or DEBUG_BYTECODE or disassemble)
free (offsetToLabel);
return;
}
static void disassemble (Bytecode b, CodeOffset codeOffset) {
interpret (b, codeOffset, TRUE);
fprintf (stderr, "\n");
}
void MLton_Bytecode_interpret (Bytecode b, CodeOffset codeOffset) {
if (DEBUG or DEBUG_BYTECODE) {
fprintf (stderr, "MLton_Bytecode_interpret ("FMTPTR", %"PRIxPTR")\n",
(uintptr_t)b,
codeOffset);
disassemble (b, codeOffset);
fprintf (stderr, "interpret starting\n");
}
interpret (b, codeOffset, FALSE);
}
|
