diff options
Diffstat (limited to 'generic')
-rw-r--r-- | generic/tclAssembly.c | 1554 | ||||
-rw-r--r-- | generic/tclAssembly.h | 73 |
2 files changed, 1277 insertions, 350 deletions
diff --git a/generic/tclAssembly.c b/generic/tclAssembly.c index 71e7412..ec9c9c1 100644 --- a/generic/tclAssembly.c +++ b/generic/tclAssembly.c @@ -17,6 +17,8 @@ static void BBEmitInstInt4(AssembleEnv* assemEnvPtr, int tblind, int opnd, static void BBEmitInst1or4(AssembleEnv* assemEnvPtr, int tblind, int param, int count); static void BBEmitOpcode(AssembleEnv* assemEnvPtr, int tblind, int count); +static int BuildExceptionRanges(AssembleEnv* assemEnvPtr); +static int CheckForUnclosedCatches(AssembleEnv*); static int CheckNamespaceQualifiers(Tcl_Interp*, const char*, int); static int CheckNonNegative(Tcl_Interp*, int); static int CheckOneByte(Tcl_Interp*, int); @@ -25,8 +27,10 @@ static int CheckStack(AssembleEnv*); static int CheckStrictlyPositive(Tcl_Interp*, int); static int CheckUndefinedLabels(AssembleEnv*); static ByteCode * CompileAssembleObj(Tcl_Interp *interp, Tcl_Obj *objPtr); +static void CompileEmbeddedScript(AssembleEnv*, Tcl_Token*, TalInstDesc*); static int DefineLabel(AssembleEnv* envPtr, const char* label); static void DupAssembleCodeInternalRep(Tcl_Obj* src, Tcl_Obj* dest); +static JumpLabel* FindLabel(AssembleEnv* envPtr, Tcl_Obj* name); static int FindLocalVar(AssembleEnv* envPtr, Tcl_Token** tokenPtrPtr); static int FinishAssembly(AssembleEnv*); static void FreeAssembleCodeInternalRep(Tcl_Obj *objPtr); @@ -35,13 +39,25 @@ static int GetBooleanOperand(AssembleEnv*, Tcl_Token**, int*); static int GetListIndexOperand(AssembleEnv*, Tcl_Token**, int*); static int GetIntegerOperand(AssembleEnv*, Tcl_Token**, int*); static int GetNextOperand(AssembleEnv*, Tcl_Token**, Tcl_Obj**); +static void LookForFreshCatches(BasicBlock*, BasicBlock**); +static void MoveExceptionRangesToBasicBlock(AssembleEnv*, int, int); static AssembleEnv* NewAssembleEnv(CompileEnv*, int); +static int ProcessCatches(AssembleEnv*); +static int ProcessCatchesInBasicBlock(AssembleEnv*, BasicBlock*, BasicBlock*, + enum BasicBlockCatchState, int); +static void ResetVisitedBasicBlocks(AssembleEnv*); +static void RestoreEmbeddedExceptionRanges(AssembleEnv*); static int StackCheckBasicBlock(AssembleEnv*, BasicBlock *, BasicBlock *, int); static BasicBlock* StartBasicBlock(AssembleEnv*, int fallthrough, Tcl_Obj* jumpLabel); /* static int AdvanceIp(const unsigned char *pc); */ static int StackCheckBasicBlock(AssembleEnv*, BasicBlock *, BasicBlock *, int); +static int StackCheckExit(AssembleEnv*); +static void StackFreshCatches(AssembleEnv*, BasicBlock*, int, BasicBlock**, + int*); static void SyncStackDepth(AssembleEnv*); +static void UnstackExpiredCatches(CompileEnv*, BasicBlock*, int, + BasicBlock**, int*); /* Tcl_ObjType that describes bytecode emitted by the assembler */ @@ -80,204 +96,133 @@ TalInstDesc TalInstructionTable[] = { /* PUSH must be first, see the code near the end of TclAssembleCode */ - {"push", ASSEM_PUSH , (INST_PUSH1<<8 - | INST_PUSH4), 0 , 1}, - - {"add", ASSEM_1BYTE , INST_ADD , 2 , 1}, - {"append", ASSEM_LVT, (INST_APPEND_SCALAR1<<8 - | INST_APPEND_SCALAR4), - 1, 1}, - {"appendArray", - ASSEM_LVT, (INST_APPEND_ARRAY1<<8 - | INST_APPEND_ARRAY4), - 2, 1}, - {"appendArrayStk", - ASSEM_1BYTE, INST_APPEND_ARRAY_STK, - 3, 1}, - {"appendStk", - ASSEM_1BYTE, INST_APPEND_STK, - 2, 1}, - {"bitand", ASSEM_1BYTE , INST_BITAND , 2 , 1}, - {"bitnot", ASSEM_1BYTE, INST_BITNOT, 1, 1}, - {"bitor", ASSEM_1BYTE , INST_BITOR , 2 , 1}, - {"bitxor", ASSEM_1BYTE , INST_BITXOR , 2 , 1}, - {"concat", ASSEM_CONCAT1, INST_CONCAT1, INT_MIN,1}, - {"dictAppend", - ASSEM_LVT4, INST_DICT_APPEND, - 2, 1}, - {"dictGet", ASSEM_DICT_GET, INST_DICT_GET, INT_MIN,1}, - {"dictIncrImm", - ASSEM_SINT4_LVT4, - INST_DICT_INCR_IMM, - 1, 1}, - {"dictLappend", - ASSEM_LVT4, INST_DICT_LAPPEND, - 2, 1}, - {"dictSet", ASSEM_DICT_SET, INST_DICT_SET, INT_MIN,1}, - {"dictUnset", - ASSEM_DICT_UNSET, - INST_DICT_UNSET,INT_MIN,1}, - {"div", ASSEM_1BYTE, INST_DIV, 2, 1}, - {"dup", ASSEM_1BYTE , INST_DUP , 1 , 2}, - {"eq", ASSEM_1BYTE , INST_EQ , 2 , 1}, - {"eval", ASSEM_EVAL, INST_EVAL_STK, 1, 1}, - {"evalStk", ASSEM_1BYTE, INST_EVAL_STK, 1, 1}, - {"exist", ASSEM_LVT4, INST_EXIST_SCALAR, - 0, 1}, - {"existArray", - ASSEM_LVT4, INST_EXIST_ARRAY, - 1, 1}, - {"existArrayStk", - ASSEM_1BYTE, INST_EXIST_ARRAY_STK, - 2, 1}, - {"existStk", - ASSEM_1BYTE, INST_EXIST_STK, 1, 1}, - {"expon", ASSEM_1BYTE, INST_EXPON, 2, 1}, - {"expr", ASSEM_EVAL, INST_EXPR_STK, 1, 1}, - {"exprStk", ASSEM_1BYTE, INST_EXPR_STK, 1, 1}, - {"ge", ASSEM_1BYTE , INST_GE , 2 , 1}, - {"gt", ASSEM_1BYTE , INST_GT , 2 , 1}, - {"incr", ASSEM_LVT1, INST_INCR_SCALAR1, - 1, 1}, - {"incrArray", - ASSEM_LVT1, INST_INCR_ARRAY1, - 2, 1}, - {"incrArrayImm", - ASSEM_LVT1_SINT1, - INST_INCR_ARRAY1_IMM, - 1, 1}, - {"incrArrayStk", ASSEM_1BYTE, INST_INCR_ARRAY_STK, - 3, 1}, - {"incrArrayStkImm", - ASSEM_SINT1, INST_INCR_ARRAY_STK_IMM, - 2, 1}, - {"incrImm", - ASSEM_LVT1_SINT1, - INST_INCR_SCALAR1_IMM, - 0, 1}, - {"incrStk", ASSEM_1BYTE, INST_INCR_SCALAR_STK, - 2, 1}, - {"incrStkImm", - ASSEM_SINT1, INST_INCR_SCALAR_STK_IMM, - 1, 1}, - {"invokeStk", - ASSEM_INVOKE, (INST_INVOKE_STK1 << 8 - | INST_INVOKE_STK4), - INT_MIN,1}, - {"jump", ASSEM_JUMP, (INST_JUMP1 << 8 - | INST_JUMP4), 0, 0}, - {"jumpFalse", - ASSEM_JUMP, (INST_JUMP_FALSE1 << 8 - | INST_JUMP_FALSE4), - 1, 0}, - {"jumpTrue",ASSEM_JUMP, (INST_JUMP_TRUE1 << 8 - | INST_JUMP_TRUE4), - 1, 0}, - {"label", ASSEM_LABEL, 0, 0, 0}, - {"land", ASSEM_1BYTE , INST_LAND , 2 , 1}, - {"lappend", ASSEM_LVT, (INST_LAPPEND_SCALAR1<<8 - | INST_LAPPEND_SCALAR4), - 1, 1}, - {"lappendArray", - ASSEM_LVT, (INST_LAPPEND_ARRAY1<<8 - | INST_LAPPEND_ARRAY4), - 2, 1}, - {"lappendArrayStk", - ASSEM_1BYTE, INST_LAPPEND_ARRAY_STK, - 3, 1}, - {"lappendStk", - ASSEM_1BYTE, INST_LAPPEND_STK, - 2, 1}, - {"le", ASSEM_1BYTE , INST_LE , 2 , 1}, - {"lindexMulti", - ASSEM_LINDEX_MULTI, - INST_LIST_INDEX_MULTI, - INT_MIN,1}, - {"list", ASSEM_LIST, INST_LIST, INT_MIN,1}, - {"listIn", ASSEM_1BYTE, INST_LIST_IN, 2, 1}, - {"listIndex", - ASSEM_1BYTE, INST_LIST_INDEX,2, 1}, - {"listIndexImm", - ASSEM_INDEX, INST_LIST_INDEX_IMM, - 1, 1}, - {"listLength", - ASSEM_1BYTE, INST_LIST_LENGTH, - 1, 1}, - {"listNotIn", - ASSEM_1BYTE, INST_LIST_NOT_IN, - 2, 1}, - {"load", ASSEM_LVT, (INST_LOAD_SCALAR1 << 8 - | INST_LOAD_SCALAR4), - 0, 1}, - {"loadArray", - ASSEM_LVT, (INST_LOAD_ARRAY1<<8 - | INST_LOAD_ARRAY4), - 1, 1}, - {"loadArrayStk", - ASSEM_1BYTE, INST_LOAD_ARRAY_STK, - 2, 1}, - {"loadStk", ASSEM_1BYTE, INST_LOAD_SCALAR_STK, - 1, 1}, - {"lor", ASSEM_1BYTE , INST_LOR , 2 , 1}, - {"lsetFlat", - ASSEM_LSET_FLAT,INST_LSET_FLAT, INT_MIN,1}, - {"lsetList", - ASSEM_1BYTE, INST_LSET_LIST, 3, 1}, - {"lshift", ASSEM_1BYTE , INST_LSHIFT , 2 , 1}, - {"lt", ASSEM_1BYTE , INST_LT , 2 , 1}, - {"mod", ASSEM_1BYTE, INST_MOD, 2, 1}, - {"mult", ASSEM_1BYTE , INST_MULT , 2 , 1}, - {"neq", ASSEM_1BYTE , INST_NEQ , 2 , 1}, - {"nop", ASSEM_1BYTE, INST_NOP, 0, 0}, - {"not", ASSEM_1BYTE, INST_LNOT, 1, 1}, - {"nsupvar", ASSEM_LVT4, INST_NSUPVAR, 2, 1}, - {"over", ASSEM_OVER, INST_OVER, INT_MIN, -1-1}, - {"pop", ASSEM_1BYTE , INST_POP , 1 , 0}, - {"regexp", ASSEM_REGEXP, INST_REGEXP, 2, 1}, - {"reverse", ASSEM_REVERSE, INST_REVERSE, INT_MIN, -1-0}, - {"rshift", ASSEM_1BYTE , INST_RSHIFT , 2 , 1}, - {"store", ASSEM_LVT, (INST_STORE_SCALAR1<<8 - | INST_STORE_SCALAR4), - 1, 1}, - {"storeArray", - ASSEM_LVT, (INST_STORE_ARRAY1<<8 - | INST_STORE_ARRAY4), - 2, 1}, - {"storeArrayStk", - ASSEM_1BYTE, INST_STORE_ARRAY_STK, - 3, 1}, - {"storeStk", - ASSEM_1BYTE, INST_STORE_SCALAR_STK, - 2, 1}, - {"strcmp", ASSEM_1BYTE, INST_STR_CMP, 2, 1}, - {"streq", ASSEM_1BYTE, INST_STR_EQ, 2, 1}, - {"strindex", - ASSEM_1BYTE, INST_STR_INDEX, 2, 1}, - {"strlen", ASSEM_1BYTE, INST_STR_LEN, 1, 1}, - {"strmatch", - ASSEM_BOOL, INST_STR_MATCH, 2, 1}, - {"strneq", ASSEM_1BYTE, INST_STR_NEQ, 2, 1}, - {"sub", ASSEM_1BYTE , INST_SUB , 2 , 1}, - {"tryCvtToNumeric", - ASSEM_1BYTE, INST_TRY_CVT_TO_NUMERIC, - 1, 1}, - {"uminus", ASSEM_1BYTE, INST_UMINUS, 1, 1}, - {"unset", ASSEM_BOOL_LVT4, - INST_UNSET_SCALAR, - 0, 0}, - {"unsetArray", - ASSEM_BOOL_LVT4, - INST_UNSET_ARRAY, - 1, 0}, - {"unsetArrayStk", - ASSEM_BOOL, INST_UNSET_ARRAY_STK, - 2, 0}, - {"unsetStk", - ASSEM_BOOL, INST_UNSET_STK, 1, 0}, - {"uplus", ASSEM_1BYTE, INST_UPLUS, 1, 1}, - {"upvar", ASSEM_LVT4, INST_UPVAR, 2, 1}, - {"variable",ASSEM_LVT4, INST_VARIABLE, 1, 0}, - {NULL, 0, 0,0} + {"push", ASSEM_PUSH , (INST_PUSH1<<8 + | INST_PUSH4), 0 , 1}, + + {"add", ASSEM_1BYTE , INST_ADD , 2 , 1}, + {"append", ASSEM_LVT, (INST_APPEND_SCALAR1<<8 + | INST_APPEND_SCALAR4),1, 1}, + {"appendArray", ASSEM_LVT, (INST_APPEND_ARRAY1<<8 + | INST_APPEND_ARRAY4), 2, 1}, + {"appendArrayStk", ASSEM_1BYTE, INST_APPEND_ARRAY_STK, 3, 1}, + {"appendStk", ASSEM_1BYTE, INST_APPEND_STK, 2, 1}, + {"beginCatch", ASSEM_BEGIN_CATCH, + INST_BEGIN_CATCH4, 0, 0}, + {"bitand", ASSEM_1BYTE , INST_BITAND , 2 , 1}, + {"bitnot", ASSEM_1BYTE, INST_BITNOT, 1, 1}, + {"bitor", ASSEM_1BYTE , INST_BITOR , 2 , 1}, + {"bitxor", ASSEM_1BYTE , INST_BITXOR , 2 , 1}, + {"concat", ASSEM_CONCAT1, INST_CONCAT1, INT_MIN,1}, + {"dictAppend", ASSEM_LVT4, INST_DICT_APPEND, 2, 1}, + {"dictGet", ASSEM_DICT_GET, INST_DICT_GET, INT_MIN,1}, + {"dictIncrImm", ASSEM_SINT4_LVT4, + INST_DICT_INCR_IMM, 1, 1}, + {"dictLappend", ASSEM_LVT4, INST_DICT_LAPPEND, 2, 1}, + {"dictSet", ASSEM_DICT_SET, INST_DICT_SET, INT_MIN,1}, + {"dictUnset", ASSEM_DICT_UNSET, + INST_DICT_UNSET, INT_MIN,1}, + {"div", ASSEM_1BYTE, INST_DIV, 2, 1}, + {"doneCatch", ASSEM_DONECATCH,0, 0, 0}, + {"dup", ASSEM_1BYTE , INST_DUP , 1 , 2}, + {"endCatch", ASSEM_END_CATCH,INST_END_CATCH, 0, 0}, + {"eq", ASSEM_1BYTE , INST_EQ , 2 , 1}, + {"eval", ASSEM_EVAL, INST_EVAL_STK, 1, 1}, + {"evalStk", ASSEM_1BYTE, INST_EVAL_STK, 1, 1}, + {"exist", ASSEM_LVT4, INST_EXIST_SCALAR, 0, 1}, + {"existArray", ASSEM_LVT4, INST_EXIST_ARRAY, 1, 1}, + {"existArrayStk", ASSEM_1BYTE, INST_EXIST_ARRAY_STK, 2, 1}, + {"existStk", ASSEM_1BYTE, INST_EXIST_STK, 1, 1}, + {"expon", ASSEM_1BYTE, INST_EXPON, 2, 1}, + {"expr", ASSEM_EVAL, INST_EXPR_STK, 1, 1}, + {"exprStk", ASSEM_1BYTE, INST_EXPR_STK, 1, 1}, + {"ge", ASSEM_1BYTE , INST_GE , 2 , 1}, + {"gt", ASSEM_1BYTE , INST_GT , 2 , 1}, + {"incr", ASSEM_LVT1, INST_INCR_SCALAR1, 1, 1}, + {"incrArray", ASSEM_LVT1, INST_INCR_ARRAY1, 2, 1}, + {"incrArrayImm", ASSEM_LVT1_SINT1, + INST_INCR_ARRAY1_IMM, 1, 1}, + {"incrArrayStk", ASSEM_1BYTE, INST_INCR_ARRAY_STK, 3, 1}, + {"incrArrayStkImm", ASSEM_SINT1, INST_INCR_ARRAY_STK_IMM,2, 1}, + {"incrImm", ASSEM_LVT1_SINT1, + INST_INCR_SCALAR1_IMM, 0, 1}, + {"incrStk", ASSEM_1BYTE, INST_INCR_SCALAR_STK, 2, 1}, + {"incrStkImm", ASSEM_SINT1, INST_INCR_SCALAR_STK_IMM, + 1, 1}, + {"invokeStk", ASSEM_INVOKE, (INST_INVOKE_STK1 << 8 + | INST_INVOKE_STK4), INT_MIN,1}, + {"jump", ASSEM_JUMP, (INST_JUMP1 << 8 + | INST_JUMP4), 0, 0}, + {"jumpFalse", ASSEM_JUMP, (INST_JUMP_FALSE1 << 8 + | INST_JUMP_FALSE4), 1, 0}, + {"jumpTrue", ASSEM_JUMP, (INST_JUMP_TRUE1 << 8 + | INST_JUMP_TRUE4), 1, 0}, + {"label", ASSEM_LABEL, 0, 0, 0}, + {"land", ASSEM_1BYTE , INST_LAND , 2 , 1}, + {"lappend", ASSEM_LVT, (INST_LAPPEND_SCALAR1<<8 + | INST_LAPPEND_SCALAR4), + 1, 1}, + {"lappendArray", ASSEM_LVT, (INST_LAPPEND_ARRAY1<<8 + | INST_LAPPEND_ARRAY4),2, 1}, + {"lappendArrayStk", ASSEM_1BYTE, INST_LAPPEND_ARRAY_STK, 3, 1}, + {"lappendStk", ASSEM_1BYTE, INST_LAPPEND_STK, 2, 1}, + {"le", ASSEM_1BYTE , INST_LE , 2 , 1}, + {"lindexMulti", ASSEM_LINDEX_MULTI, + INST_LIST_INDEX_MULTI, INT_MIN,1}, + {"list", ASSEM_LIST, INST_LIST, INT_MIN,1}, + {"listIn", ASSEM_1BYTE, INST_LIST_IN, 2, 1}, + {"listIndex", ASSEM_1BYTE, INST_LIST_INDEX, 2, 1}, + {"listIndexImm", ASSEM_INDEX, INST_LIST_INDEX_IMM, 1, 1}, + {"listLength", ASSEM_1BYTE, INST_LIST_LENGTH, 1, 1}, + {"listNotIn", ASSEM_1BYTE, INST_LIST_NOT_IN, 2, 1}, + {"load", ASSEM_LVT, (INST_LOAD_SCALAR1 << 8 + | INST_LOAD_SCALAR4), 0, 1}, + {"loadArray", ASSEM_LVT, (INST_LOAD_ARRAY1<<8 + | INST_LOAD_ARRAY4), 1, 1}, + {"loadArrayStk", ASSEM_1BYTE, INST_LOAD_ARRAY_STK, 2, 1}, + {"loadStk", ASSEM_1BYTE, INST_LOAD_SCALAR_STK, 1, 1}, + {"lor", ASSEM_1BYTE , INST_LOR , 2 , 1}, + {"lsetFlat", ASSEM_LSET_FLAT,INST_LSET_FLAT, INT_MIN,1}, + {"lsetList", ASSEM_1BYTE, INST_LSET_LIST, 3, 1}, + {"lshift", ASSEM_1BYTE , INST_LSHIFT , 2 , 1}, + {"lt", ASSEM_1BYTE , INST_LT , 2 , 1}, + {"mod", ASSEM_1BYTE, INST_MOD, 2, 1}, + {"mult", ASSEM_1BYTE , INST_MULT , 2 , 1}, + {"neq", ASSEM_1BYTE , INST_NEQ , 2 , 1}, + {"nop", ASSEM_1BYTE, INST_NOP, 0, 0}, + {"not", ASSEM_1BYTE, INST_LNOT, 1, 1}, + {"nsupvar", ASSEM_LVT4, INST_NSUPVAR, 2, 1}, + {"over", ASSEM_OVER, INST_OVER, INT_MIN,-1-1}, + {"pop", ASSEM_1BYTE , INST_POP , 1 , 0}, + {"pushReturnCode", ASSEM_1BYTE, INST_PUSH_RETURN_CODE, 0, 1}, + {"pushReturnOpts", ASSEM_1BYTE, INST_PUSH_RETURN_OPTIONS, + 0, 1}, + {"pushResult", ASSEM_1BYTE, INST_PUSH_RESULT, 0, 1}, + {"regexp", ASSEM_REGEXP, INST_REGEXP, 2, 1}, + {"reverse", ASSEM_REVERSE, INST_REVERSE, INT_MIN,-1-0}, + {"rshift", ASSEM_1BYTE , INST_RSHIFT , 2 , 1}, + {"store", ASSEM_LVT, (INST_STORE_SCALAR1<<8 + | INST_STORE_SCALAR4), 1, 1}, + {"storeArray", ASSEM_LVT, (INST_STORE_ARRAY1<<8 + | INST_STORE_ARRAY4), 2, 1}, + {"storeArrayStk", ASSEM_1BYTE, INST_STORE_ARRAY_STK, 3, 1}, + {"storeStk", ASSEM_1BYTE, INST_STORE_SCALAR_STK, 2, 1}, + {"strcmp", ASSEM_1BYTE, INST_STR_CMP, 2, 1}, + {"streq", ASSEM_1BYTE, INST_STR_EQ, 2, 1}, + {"strindex", ASSEM_1BYTE, INST_STR_INDEX, 2, 1}, + {"strlen", ASSEM_1BYTE, INST_STR_LEN, 1, 1}, + {"strmatch", ASSEM_BOOL, INST_STR_MATCH, 2, 1}, + {"strneq", ASSEM_1BYTE, INST_STR_NEQ, 2, 1}, + {"sub", ASSEM_1BYTE , INST_SUB , 2 , 1}, + {"tryCvtToNumeric", ASSEM_1BYTE, INST_TRY_CVT_TO_NUMERIC,1, 1}, + {"uminus", ASSEM_1BYTE, INST_UMINUS, 1, 1}, + {"unset", ASSEM_BOOL_LVT4,INST_UNSET_SCALAR, 0, 0}, + {"unsetArray", ASSEM_BOOL_LVT4,INST_UNSET_ARRAY, 1, 0}, + {"unsetArrayStk", ASSEM_BOOL, INST_UNSET_ARRAY_STK, 2, 0}, + {"unsetStk", ASSEM_BOOL, INST_UNSET_STK, 1, 0}, + {"uplus", ASSEM_1BYTE, INST_UPLUS, 1, 1}, + {"upvar", ASSEM_LVT4, INST_UPVAR, 2, 1}, + {"variable", ASSEM_LVT4, INST_VARIABLE, 1, 0}, + {NULL, 0, 0, 0, 0} }; /* @@ -854,6 +799,7 @@ NewAssembleEnv(CompileEnv* envPtr, assemEnvPtr->head_bb = AllocBB(assemEnvPtr); assemEnvPtr->curr_bb = assemEnvPtr->head_bb; + assemEnvPtr->head_bb->startLine = 1; /* Stash compilation flags */ @@ -894,6 +840,9 @@ FreeAssembleEnv(AssembleEnv* assemEnvPtr) if (thisBB->jumpTarget != NULL) { Tcl_DecrRefCount(thisBB->jumpTarget); } + if (thisBB->foreignExceptions != NULL) { + ckfree((char*)(thisBB->foreignExceptions)); + } nextBB = thisBB->successor1; ckfree((char*)thisBB); } @@ -947,11 +896,7 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) /* First operand to the instruction */ const char* operand1; /* String rep of the operand */ int operand1Len; /* String length of the operand */ - Tcl_HashEntry* entry; /* Hash entry from label and basic - * block operations */ - int isNew; /* Flag indicating that a new hash entry - * has been created */ - JumpLabel* l; /* Structure descibing a label in the + JumpLabel* l; /* Structure descibing a label in the * assembly code */ int opnd; /* Integer representation of an operand */ int litIndex; /* Literal pool index of a constant */ @@ -1002,6 +947,26 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) BBEmitOpcode(assemEnvPtr, tblind, 0); break; + case ASSEM_BEGIN_CATCH: + /* + * Emit the BEGIN_CATCH instruction with the code offset of the + * exception branch target instead of the exception range index. + * The correct index will be generated and inserted later, when + * catches are being resolved. + */ + if (parsePtr->numWords != 2) { + Tcl_WrongNumArgs(interp, 1, &instNameObj, "label"); + goto cleanup; + } + if (GetNextOperand(assemEnvPtr, &tokenPtr, &operand1Obj) != TCL_OK) { + goto cleanup; + } + FindLabel(assemEnvPtr, operand1Obj); + BBEmitInstInt4(assemEnvPtr, tblind, 0, 0); + assemEnvPtr->curr_bb->flags |= BB_BEGINCATCH; + StartBasicBlock(assemEnvPtr, 1, operand1Obj); + break; + case ASSEM_BOOL: if (parsePtr->numWords != 2) { Tcl_WrongNumArgs(interp, 1, &instNameObj, "boolean"); @@ -1079,6 +1044,21 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) TclEmitInt4(localVar, envPtr); break; + case ASSEM_DONECATCH: + StartBasicBlock(assemEnvPtr, 0, NULL); + assemEnvPtr->curr_bb->flags |= BB_DONECATCH; + break; + + case ASSEM_END_CATCH: + if (parsePtr->numWords != 1) { + Tcl_WrongNumArgs(interp, 1, &instNameObj, ""); + goto cleanup; + } + assemEnvPtr->curr_bb->flags |= BB_ENDCATCH; + BBEmitOpcode(assemEnvPtr, tblind, 0); + StartBasicBlock(assemEnvPtr, 1, NULL); + break; + case ASSEM_EVAL: /* TODO - Refactor this stuff into a subroutine * that takes the inst code, the message ("script" or "expression") @@ -1092,34 +1072,10 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) goto cleanup; } if (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { - /* - * The expression or script is not only known at compile time, - * but actually a "simple word". It can be compiled inline by - * invoking the compiler recursively. - */ - int savedStackDepth = envPtr->currStackDepth; - int savedMaxStackDepth = envPtr->maxStackDepth; - envPtr->currStackDepth = 0; - envPtr->maxStackDepth = 0; - switch(TalInstructionTable[tblind].tclInstCode) { - case INST_EVAL_STK: - TclCompileScript(interp, tokenPtr[1].start, - tokenPtr[1].size, envPtr); - break; - case INST_EXPR_STK: - TclCompileExpr(interp, tokenPtr[1].start, - tokenPtr[1].size, envPtr, 1); - break; - default: - Tcl_Panic("no ASSEM_EVAL case for %s (%d), can't happen", - TalInstructionTable[tblind].name, - TalInstructionTable[tblind].tclInstCode); - } - SyncStackDepth(assemEnvPtr); - envPtr->currStackDepth = savedStackDepth; - envPtr->maxStackDepth = savedMaxStackDepth; - } else if (GetNextOperand(assemEnvPtr, &tokenPtr, &operand1Obj) - != TCL_OK) { + CompileEmbeddedScript(assemEnvPtr, tokenPtr+1, + TalInstructionTable+tblind); + } else if (GetNextOperand(assemEnvPtr, &tokenPtr, + &operand1Obj) != TCL_OK) { goto cleanup; } else { operand1 = Tcl_GetStringFromObj(operand1Obj, &operand1Len); @@ -1151,17 +1107,8 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) if (GetNextOperand(assemEnvPtr, &tokenPtr, &operand1Obj) != TCL_OK) { goto cleanup; } - entry = Tcl_CreateHashEntry(&assemEnvPtr->labelHash, - Tcl_GetString(operand1Obj), &isNew); - if (isNew) { - l = (JumpLabel*) ckalloc(sizeof(JumpLabel)); - l -> isDefined = 0; - l -> offset = -1; - Tcl_SetHashValue(entry, l); - } else { - l = Tcl_GetHashValue(entry); - } - if (l -> isDefined) { + l = FindLabel(assemEnvPtr, operand1Obj); + if (l->isDefined) { BBEmitInst1or4(assemEnvPtr, tblind, l->offset - (envPtr->codeNext - envPtr->codeStart), 0); @@ -1175,7 +1122,7 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) assemEnvPtr->curr_bb->jumpLine = assemEnvPtr->cmdLine; StartBasicBlock(assemEnvPtr, - TalInstructionTable[tblind].operandsConsumed, + (TalInstructionTable[tblind].operandsConsumed != 0), operand1Obj); break; @@ -1380,6 +1327,199 @@ AssembleOneLine(AssembleEnv* assemEnvPtr) /* *----------------------------------------------------------------------------- * + * CompileEmbeddedScript -- + * + * Compile an embedded 'eval' or 'expr' that appears in assembly code. + * + * This procedure is called when the 'eval' or 'expr' assembly directive + * is encountered, and the argument to the directive is a simple word that + * requires no substitution. The appropriate compiler (TclCompileScript or + * TclCompileExpr) is invoked recursively, and emits bytecode. + * + * Before the compiler is invoked, the compilation environment's stack + * consumption is reset to zero. Upon return from the compilation, the + * net stack effect of the compilation is in the compiler env, and this + * stack effect is posted to the assembler environment. The compile + * environment's stack consumption is then restored to what it was + * before (which is actually the state of the stack on entry to the block + * of assembly code). + * + * Any exception ranges pushed by the compilation are copied to the basic + * block and removed from the compiler environment. They will be rebuilt at + * the end of assembly, when the exception stack depth is actually known. + * + *----------------------------------------------------------------------------- + */ + +static void +CompileEmbeddedScript(AssembleEnv* assemEnvPtr, + /* Assembler environment */ + Tcl_Token* tokenPtr, + /* Tcl_Token containing the script */ + TalInstDesc* instPtr) + /* Instruction that determines whether + * the script is 'expr' or 'eval' */ +{ + /* + * The expression or script is not only known at compile time, + * but actually a "simple word". It can be compiled inline by + * invoking the compiler recursively. + */ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; + /* Tcl interpreter */ + + /* + * Save away the stack depth and reset it before compiling the script. + * We'll record the stack usage of the script in the BasicBlock, and + * accumulate it together with the stack usage of the enclosing assembly + * code. + */ + + int savedStackDepth = envPtr->currStackDepth; + int savedMaxStackDepth = envPtr->maxStackDepth; + int savedCodeIndex = envPtr->codeNext - envPtr->codeStart; + int savedExceptArrayNext = envPtr->exceptArrayNext; + + envPtr->currStackDepth = 0; + envPtr->maxStackDepth = 0; + + StartBasicBlock(assemEnvPtr, 1, NULL); + switch(instPtr->tclInstCode) { + case INST_EVAL_STK: + TclCompileScript(interp, tokenPtr->start, tokenPtr->size, envPtr); + break; + case INST_EXPR_STK: + TclCompileExpr(interp, tokenPtr->start, tokenPtr->size, envPtr, 1); + break; + default: + Tcl_Panic("no ASSEM_EVAL case for %s (%d), can't happen", + instPtr->name, instPtr->tclInstCode); + } + + /* + * Roll up the stack usage of the embedded block into the assembler + * environment. + */ + SyncStackDepth(assemEnvPtr); + envPtr->currStackDepth = savedStackDepth; + envPtr->maxStackDepth = savedMaxStackDepth; + + /* + * Save any exception ranges that were pushed by the compiler, They + * will need to be fixed up once the stack depth is known. + */ + + MoveExceptionRangesToBasicBlock(assemEnvPtr, savedCodeIndex, + savedExceptArrayNext); + + /* Flush the current basic block */ + + StartBasicBlock(assemEnvPtr, 1, NULL); +} + +/* + *----------------------------------------------------------------------------- + * + * SyncStackDepth -- + * + * Copies the stack depth from the compile environment to a basic + * block. + * + * Side effects: + * Current and max stack depth in the current basic block are + * adjusted. + * + * This procedure is called on return from invoking the compiler for + * the 'eval' and 'expr' operations. It adjusts the stack depth of the + * current basic block to reflect the stack required by the just-compiled + * code. + * + *----------------------------------------------------------------------------- + */ + +static void +SyncStackDepth(AssembleEnv* assemEnvPtr) + /* Assembly environment */ +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + BasicBlock* curr_bb = assemEnvPtr->curr_bb; + /* Current basic block */ + int maxStackDepth = curr_bb->finalStackDepth + envPtr->maxStackDepth; + /* Max stack depth in the basic block */ + + if (maxStackDepth > curr_bb->maxStackDepth) { + curr_bb->maxStackDepth = maxStackDepth; + } + curr_bb->finalStackDepth += envPtr->currStackDepth; +} + +/* + *----------------------------------------------------------------------------- + * + * MoveExceptionRangesToBasicBlock -- + * + * Removes exception ranges that were created by compiling an embedded + * script from the CompileEnv, and stores them in the BasicBlock. They + * will be reinstalled, at the correct stack depth, after control flow + * analysis is complete on the assembly code. + * + *----------------------------------------------------------------------------- + */ + +static void +MoveExceptionRangesToBasicBlock(AssembleEnv* assemEnvPtr, + /* Assembler environment */ + int savedCodeIndex, + /* Start of the embedded code */ + int savedExceptArrayNext) + /* Saved index of the end of the exception + * range array */ +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + BasicBlock* curr_bb = assemEnvPtr->curr_bb; + /* Current basic block */ + int exceptionCount = envPtr->exceptArrayNext - savedExceptArrayNext; + /* Number of ranges that must be moved */ + int i; + + if (exceptionCount == 0) { + /* Nothing to do */ + return; + } + + /* + * Save the exception ranges in the basic block. They will be re-added + * at the conclusion of assembly; at this time, the INST_BEGIN_CATCH + * instructions in the block will be adjusted from whatever range + * indices they have [savedExceptArrayNext .. envPtr->exceptArrayNext) + * to the indices that the exceptions acquire. The saved exception ranges + * are converted to a relative nesting depth. The depth will be recomputed + * once flow analysis has determined the actual stack depth of the block. + */ + + /*fprintf(stderr, "basic block %p has %d exceptions starting at %d\n", + curr_bb, exceptionCount, savedExceptArrayNext); */ + curr_bb->foreignExceptionBase = savedExceptArrayNext; + curr_bb->foreignExceptionCount = exceptionCount; + curr_bb->foreignExceptions = (ExceptionRange*) + ckalloc(exceptionCount * sizeof(ExceptionRange)); + memcpy(curr_bb->foreignExceptions, + envPtr->exceptArrayPtr + savedExceptArrayNext, + exceptionCount * sizeof(ExceptionRange)); + for (i = 0; i < exceptionCount; ++i) { + curr_bb->foreignExceptions[i].nestingLevel -= envPtr->exceptDepth; + } + envPtr->exceptArrayNext = savedExceptArrayNext; + +} + +/* + *----------------------------------------------------------------------------- + * * GetNextOperand -- * * Retrieves the next operand in sequence from an assembly @@ -1656,43 +1796,6 @@ FindLocalVar(AssembleEnv* assemEnvPtr, /* *----------------------------------------------------------------------------- * - * SyncStackDepth -- - * - * Copies the stack depth from the compile environment to a basic - * block. - * - * Side effects: - * Current and max stack depth in the current basic block are - * adjusted. - * - * This procedure is called on return from invoking the compiler for - * the 'eval' and 'expr' operations. It adjusts the stack depth of the - * current basic block to reflect the stack required by the just-compiled - * code. - * - *----------------------------------------------------------------------------- - */ - -static void -SyncStackDepth(AssembleEnv* assemEnvPtr) - /* Assembly environment */ -{ - CompileEnv* envPtr = assemEnvPtr->envPtr; - /* Compilation environment */ - BasicBlock* curr_bb = assemEnvPtr->curr_bb; - /* Current basic block */ - int maxStackDepth = curr_bb->finalStackDepth + envPtr->maxStackDepth; - /* Max stack depth in the basic block */ - - if (maxStackDepth > curr_bb->maxStackDepth) { - curr_bb->maxStackDepth = maxStackDepth; - } - curr_bb->finalStackDepth += envPtr->currStackDepth; -} - -/* - *----------------------------------------------------------------------------- - * * CheckNamespaceQualifiers -- * * Verify that a variable name has no namespace qualifiers before @@ -1943,6 +2046,40 @@ DefineLabel(AssembleEnv* assemEnvPtr, /* Assembly environment */ return TCL_OK; } +/* + *----------------------------------------------------------------------------- + * + * FindLabel -- + * + * Find a named label in the bytecode. + * + * Results: + * Returns a pointer to the label. If the label is not known, an + * undefined placeholder is created for it. + * + *----------------------------------------------------------------------------- + */ + +static JumpLabel* +FindLabel(AssembleEnv* assemEnvPtr, + /* Assembler environment */ + Tcl_Obj* name) /* Name of the label */ +{ + int isNew; /* Flag == 1 iff the label is undefined */ + JumpLabel* l; /* Label structure for an undefined label */ + Tcl_HashEntry* entry = + Tcl_CreateHashEntry(&assemEnvPtr->labelHash, + Tcl_GetString(name), &isNew); + if (isNew) { + l = (JumpLabel*) ckalloc(sizeof(JumpLabel)); + l -> isDefined = 0; + l -> offset = -1; + Tcl_SetHashValue(entry, l); + } else { + l = Tcl_GetHashValue(entry); + } + return l; +} /* *----------------------------------------------------------------------------- @@ -1977,6 +2114,7 @@ StartBasicBlock(AssembleEnv* assemEnvPtr, /* Coalesce zero-length blocks */ if (currBB->startOffset == envPtr->codeNext - envPtr->codeStart) { + currBB->startLine = assemEnvPtr->cmdLine; return currBB; } @@ -1992,7 +2130,9 @@ StartBasicBlock(AssembleEnv* assemEnvPtr, /* Record the fallthrough if there is one. */ - currBB->may_fall_thru = fallsThrough; + if (fallsThrough) { + currBB->flags |= BB_FALLTHRU; + } /* Record the successor block */ @@ -2023,19 +2163,20 @@ AllocBB(AssembleEnv* assemEnvPtr) BasicBlock * bb = (BasicBlock *) ckalloc(sizeof(BasicBlock)); bb->startOffset = envPtr->codeNext - envPtr->codeStart; - bb->startLine = assemEnvPtr->cmdLine; + bb->startLine = assemEnvPtr->cmdLine + 1; bb->jumpLine = -1; + bb->predecessor = NULL; + bb->successor1 = NULL; + bb->jumpTarget = NULL; bb->initialStackDepth = 0; bb->minStackDepth = 0; bb->maxStackDepth = 0; bb->finalStackDepth = 0; - - bb->visited = 0; - - bb->predecessor = NULL; - bb->may_fall_thru = 0; - bb->jumpTarget = NULL; - bb->successor1 = NULL; + bb->enclosingCatch = NULL; + bb->foreignExceptionBase = -1; + bb->foreignExceptionCount = 0; + bb->foreignExceptions = NULL; + bb->flags = 0; return bb; } @@ -2065,20 +2206,6 @@ static int FinishAssembly(AssembleEnv* assemEnvPtr) /* Assembly environment */ { - CompileEnv* envPtr = assemEnvPtr->envPtr; - /* Compilation environment */ - Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; - /* Tcl interpreter */ - BasicBlock* curr_bb = assemEnvPtr->curr_bb; - /* Last basic block in the program */ - Tcl_Obj* depthObj; /* Depth of the stack on exit */ - Tcl_Obj* resultObj; /* Error message from this function */ - int litIndex; /* Index of the empty literal {} */ - - /* Tie off the last basic block */ - - curr_bb->may_fall_thru = 0; - curr_bb->jumpTarget = NULL; /* Make sure there are no undefined labels */ @@ -2086,6 +2213,12 @@ FinishAssembly(AssembleEnv* assemEnvPtr) return TCL_ERROR; } + /* Label each basic block with its catch context. Quit on inconsistency */ + + if (ProcessCatches(assemEnvPtr) != TCL_OK) { + return TCL_ERROR; + } + /* Compute stack balance throughout the program */ if (CheckStack(assemEnvPtr) != TCL_OK) { @@ -2093,44 +2226,8 @@ FinishAssembly(AssembleEnv* assemEnvPtr) } /* TODO - Check for unreachable code */ + /* Maybe not - unreachable code is Mostly Harmless. */ - /* If the exit is reachable, make sure that the program exits with - * 1 operand on the stack. */ - - if (curr_bb->visited) { - - /* Exit with no operands; push an empty one. */ - - int depth = curr_bb->finalStackDepth + curr_bb->initialStackDepth; - if (depth == 0) { - /* Emit a 'push' of the empty literal */ - litIndex = TclRegisterNewLiteral(envPtr, "", 0); - /* Assumes that 'push' is at slot 0 in TalInstructionTable */ - BBEmitInst1or4(assemEnvPtr, 0, litIndex, 0); - ++depth; - } - - /* Exit with unbalanced stack */ - - if (depth != 1) { - if (assemEnvPtr->flags & TCL_EVAL_DIRECT) { - depthObj = Tcl_NewIntObj(depth); - Tcl_IncrRefCount(depthObj); - resultObj = Tcl_NewStringObj("stack is unbalanced on exit " - "from the code (depth=", -1); - Tcl_AppendObjToObj(resultObj, depthObj); - Tcl_DecrRefCount(depthObj); - Tcl_AppendToObj(resultObj, ")", -1); - Tcl_SetObjResult(interp, resultObj); - Tcl_SetErrorCode(interp, "TCL", "ASSEM", "BADSTACK", NULL); - } - return TCL_ERROR; - } - - /* Record stack usage */ - - envPtr->currStackDepth += depth; - } return TCL_OK; } @@ -2212,10 +2309,10 @@ CheckStack(AssembleEnv* assemEnvPtr) /* Compilation environment */ int maxDepth; /* Maximum stack depth overall */ - /* Checking the head block will check all the other blocks recursively. */ + /* Checking the head block will check all the other blocks recursively. */ assemEnvPtr->maxDepth = 0; - if(StackCheckBasicBlock(assemEnvPtr, + if (StackCheckBasicBlock(assemEnvPtr, assemEnvPtr->head_bb, NULL, 0) == TCL_ERROR) { return TCL_ERROR; } @@ -2227,6 +2324,17 @@ CheckStack(AssembleEnv* assemEnvPtr) envPtr->maxStackDepth = maxDepth; } + /* If the exit is reachable, make sure that the program exits with + * 1 operand on the stack. */ + + if (StackCheckExit(assemEnvPtr) != TCL_OK) { + return TCL_ERROR; + } + + /* Reset the visited state on all basic blocks */ + + ResetVisitedBasicBlocks(assemEnvPtr); + return TCL_OK; } @@ -2263,7 +2371,7 @@ StackCheckBasicBlock(AssembleEnv* assemEnvPtr, * to this one. */ int initialStackDepth) /* Stack depth on entry to the block */ -{ +{ CompileEnv* envPtr = assemEnvPtr->envPtr; /* Compilation environment */ Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; @@ -2272,7 +2380,7 @@ StackCheckBasicBlock(AssembleEnv* assemEnvPtr, int maxDepth; /* Maximum stack depth so far */ int result; /* Tcl status return */ - if (blockPtr->visited) { + if (blockPtr->flags & BB_VISITED) { /* * If the block is already visited, check stack depth for consistency @@ -2302,7 +2410,7 @@ StackCheckBasicBlock(AssembleEnv* assemEnvPtr, * block underflows the stack, and update max stack depth in the * assembly environment. */ - blockPtr->visited = 1; + blockPtr->flags |= BB_VISITED; blockPtr->predecessor = predecessor; blockPtr->initialStackDepth = initialStackDepth; if (initialStackDepth + blockPtr->minStackDepth < 0) { @@ -2327,7 +2435,7 @@ StackCheckBasicBlock(AssembleEnv* assemEnvPtr, stackDepth = initialStackDepth + blockPtr->finalStackDepth; result = TCL_OK; - if (blockPtr->may_fall_thru) { + if (blockPtr->flags & BB_FALLTHRU) { result = StackCheckBasicBlock(assemEnvPtr, blockPtr->successor1, blockPtr, stackDepth); @@ -2346,6 +2454,760 @@ StackCheckBasicBlock(AssembleEnv* assemEnvPtr, /* *----------------------------------------------------------------------------- * + * StackCheckExit -- + * + * Makes sure that the net stack effect of an entire assembly language + * script is to push 1 result. + * + * Results: + * Returns a standard Tcl result, with an error message in the interpreter + * result if the stack is wrong. + * + * Side effects: + * If the assembly code had a net stack effect of zero, emits code + * to the concluding block to push a null result. In any case, + * updates the stack depth in the compile environment to reflect + * the net effect of the assembly code. + * + *----------------------------------------------------------------------------- + */ + +static int +StackCheckExit(AssembleEnv* assemEnvPtr) + /* Assembler environment */ +{ + + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; + /* Tcl interpreter */ + int depth; /* Net stack effect */ + int litIndex; /* Index in the literal pool of the empty + * string */ + Tcl_Obj* depthObj; /* Net stack effect for an error message */ + Tcl_Obj* resultObj; /* Error message from this procedure */ + BasicBlock* curr_bb = assemEnvPtr->curr_bb; + /* Final basic block in the assembly */ + + /* + * Don't perform these checks if execution doesn't reach the + * exit (either because of an infinite loop or because the only + * return is from the middle. + */ + + if (curr_bb->flags & BB_VISITED) { + + /* Exit with no operands; push an empty one. */ + + depth = curr_bb->finalStackDepth + curr_bb->initialStackDepth; + if (depth == 0) { + /* Emit a 'push' of the empty literal */ + litIndex = TclRegisterNewLiteral(envPtr, "", 0); + /* Assumes that 'push' is at slot 0 in TalInstructionTable */ + BBEmitInst1or4(assemEnvPtr, 0, litIndex, 0); + ++depth; + } + + /* Exit with unbalanced stack */ + + if (depth != 1) { + if (assemEnvPtr->flags & TCL_EVAL_DIRECT) { + depthObj = Tcl_NewIntObj(depth); + Tcl_IncrRefCount(depthObj); + resultObj = Tcl_NewStringObj("stack is unbalanced on exit " + "from the code (depth=", -1); + Tcl_AppendObjToObj(resultObj, depthObj); + Tcl_DecrRefCount(depthObj); + Tcl_AppendToObj(resultObj, ")", -1); + Tcl_SetObjResult(interp, resultObj); + Tcl_SetErrorCode(interp, "TCL", "ASSEM", "BADSTACK", NULL); + } + return TCL_ERROR; + } + + /* Record stack usage */ + + envPtr->currStackDepth += depth; + } + + return TCL_OK; +} + +/* + *----------------------------------------------------------------------------- + * + * ProcessCatches -- + * + * First pass of 'catch' processing. + * + * Results: + * Returns a standard Tcl result, with an appropriate error message + * if the result is TCL_ERROR. + * + * Side effects: + * Labels all basic blocks with their enclosing catches. + * + *----------------------------------------------------------------------------- + */ + +static int +ProcessCatches(AssembleEnv* assemEnvPtr) + /* Assembler environment */ +{ + BasicBlock* blockPtr; /* Pointer to a basic block */ + + /* + * Clear the catch state of all basic blocks + */ + + for (blockPtr = assemEnvPtr->head_bb; + blockPtr != NULL; + blockPtr = blockPtr->successor1) { + blockPtr->catchState = BBCS_UNKNOWN; + blockPtr->enclosingCatch = NULL; + } + + /* + * Start the check recursively from the first basic block, which + * is outside any exception context + */ + + if (ProcessCatchesInBasicBlock(assemEnvPtr, assemEnvPtr->head_bb, + NULL, BBCS_NONE, 0) != TCL_OK) { + return TCL_ERROR; + } + + /* Check for unclosed catch on exit */ + + if (CheckForUnclosedCatches(assemEnvPtr) != TCL_OK) { + return TCL_ERROR; + } + + /* Now there's enough information to build the exception ranges. */ + + if (BuildExceptionRanges(assemEnvPtr) != TCL_OK) { + return TCL_ERROR; + } + + /* Finally, restore any exception ranges from embedded scripts */ + + RestoreEmbeddedExceptionRanges(assemEnvPtr); + + return TCL_OK; +} + +/* + *----------------------------------------------------------------------------- + * + * ProcessCatchesInBasicBlock -- + * + * First-pass catch processing for one basic block. + * + * Results: + * Returns a standard Tcl result, with error message in the interpreter + * result if an error occurs. + * + * This procedure checks consistency of the exception context through the + * assembler program, and records the enclosing 'catch' for every basic + * block. + * + *----------------------------------------------------------------------------- + */ + +static int +ProcessCatchesInBasicBlock(AssembleEnv* assemEnvPtr, + /* Assembler environment */ + BasicBlock* bbPtr, + /* Basic block being processed */ + BasicBlock* enclosing, + /* Start basic block of the enclosing catch */ + enum BasicBlockCatchState state, + /* BBCS_NONE, BBCS_INCATCH, or BBCS_CAUGHT */ + int catchDepth) + /* Depth of nesting of catches */ +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; + /* Tcl interpreter */ + int result; /* Return value from this procedure */ + BasicBlock* fallThruEnclosing; + /* Enclosing catch if execution falls thru */ + enum BasicBlockCatchState fallThruState; + /* Catch state of the successor block */ + BasicBlock* jumpEnclosing; + /* Enclosing catch if execution goes to + * jump target */ + enum BasicBlockCatchState jumpState; + /* Catch state of the jump target */ + int changed = 0; /* Flag == 1 iff successor blocks need + * to be checked because the state of this + * block has changed. */ + + /* + * Update the state of the current block, checking for consistency. + * Set 'changed' to 1 if the state changes and successor blocks + * need to be rechecked. + */ + + if (bbPtr->catchState == BBCS_UNKNOWN) { + bbPtr->enclosingCatch = enclosing; + } else if (bbPtr->enclosingCatch != enclosing) { + if (assemEnvPtr->flags & TCL_EVAL_DIRECT) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj("execution reaches block in " + "inconsistent exception contexts", + -1)); + Tcl_SetErrorLine(interp, bbPtr->startLine); + Tcl_SetErrorCode(interp, "TCL", "ASSEM", "BADCATCH", NULL); + } + return TCL_ERROR; + } + if (state > bbPtr->catchState) { + bbPtr->catchState = state; + changed = 1; + } + + /* + * If this block has been visited before, and its state hasn't + * changed, we're done with it for now. + */ + + if (!changed) { + return TCL_OK; + } + bbPtr->catchDepth = catchDepth; + + /* + * Determine enclosing catch and 'caught' state for the fallthrough + * and the jump target. Default for both is the state of the current block. + */ + + fallThruEnclosing = enclosing; + fallThruState = state; + jumpEnclosing = enclosing; + jumpState = state; + + /* TODO: Make sure that the test cases include validating + * that a natural loop can't include 'beginCatch' or 'endCatch' */ + + if (bbPtr->flags & BB_DONECATCH) { + /* + * If the block finishes a catch body, the block and its successors + * are outside the exception range. (The block may also end the + * catch or begin another one, so we need to check for those + * conditions as well.) + */ + if (enclosing == NULL) { + if (assemEnvPtr->flags & TCL_EVAL_DIRECT) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj("doneCatch without a " + "corresponding beginCatch", + -1)); + Tcl_SetErrorLine(interp, bbPtr->startLine); + Tcl_SetErrorCode(interp, "TCL", "ASSEM", "BADENDCATCH", NULL); + } + return TCL_ERROR; + } + if (bbPtr->catchState < BB_DONECATCH) { + bbPtr->catchState = BBCS_DONECATCH; + fallThruState = BBCS_DONECATCH; + jumpState = BBCS_DONECATCH; + } + } + + if (bbPtr->flags & BB_BEGINCATCH) { + /* + * If the block begins a catch, the state for the successor is + * 'in catch'. The jump target is the exception exit, and the state + * of the jump target is 'caught.' + */ + fallThruEnclosing = bbPtr; + fallThruState = BBCS_INCATCH; + jumpEnclosing = bbPtr; + jumpState = BBCS_CAUGHT; + ++catchDepth; + } + + if (bbPtr->flags & BB_ENDCATCH) { + /* + * If the block ends a catch, the state for the successor is + * whatever the state was on entry to the catch. + */ + if (enclosing == NULL) { + if (assemEnvPtr->flags & TCL_EVAL_DIRECT) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj("endCatch without a " + "corresponding beginCatch", + -1)); + Tcl_SetErrorLine(interp, bbPtr->startLine); + Tcl_SetErrorCode(interp, "TCL", "ASSEM", "BADENDCATCH", NULL); + } + return TCL_ERROR; + } + fallThruEnclosing = enclosing->enclosingCatch; + fallThruState = enclosing->catchState; + --catchDepth; + } + + /* + * Visit any successor blocks with the appropriate exception context + */ + + result = TCL_OK; + if (bbPtr->flags & BB_FALLTHRU) { + result = ProcessCatchesInBasicBlock(assemEnvPtr, bbPtr->successor1, + fallThruEnclosing, fallThruState, + catchDepth); + } + if (result == TCL_OK && bbPtr->jumpTarget != NULL) { + Tcl_HashEntry* entry = + Tcl_FindHashEntry(&assemEnvPtr->labelHash, + Tcl_GetString(bbPtr->jumpTarget)); + JumpLabel* targetLabel = (JumpLabel*) Tcl_GetHashValue(entry); + result = ProcessCatchesInBasicBlock(assemEnvPtr, + targetLabel->basicBlock, + jumpEnclosing, jumpState, + catchDepth); + } + return result; +} + +/* + *----------------------------------------------------------------------------- + * + * CheckForUnclosedCatches -- + * + * Checks that a sequence of assembly code has no unclosed catches + * on exit. + * + * Results: + * Returns a standard Tcl result, with an error message for unclosed + * catches. + * + *----------------------------------------------------------------------------- + */ + +static int +CheckForUnclosedCatches(AssembleEnv* assemEnvPtr) +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; + /* Tcl interpreter */ + + if (assemEnvPtr->curr_bb->catchState >= BBCS_INCATCH) { + if (assemEnvPtr->flags & TCL_EVAL_DIRECT) { + Tcl_SetObjResult(interp, Tcl_NewStringObj("catch still active on " + "exit from block", -1)); + Tcl_SetErrorLine(interp, + assemEnvPtr->curr_bb->enclosingCatch->startLine); + Tcl_SetErrorCode(interp, "TCL", "ASSEM", "UNCLOSEDCATCH", -1); + } + return TCL_ERROR; + } + return TCL_OK; +} + +/* + *----------------------------------------------------------------------------- + * + * BuildExceptionRanges -- + * + * Walks through the assembly code and builds exception ranges for + * the catches embedded therein. + * + * Results: + * Returns a standard Tcl result with an error message in the interpreter + * if anything is unsuccessful. + * + * Side effects: + * Each contiguous block of code with a given catch exit is assigned + * an exception range at the appropriate level. + * Exception ranges in embedded blocks have their levels corrected + * and collated into the table. + * Blocks that end with 'beginCatch' are associated with the innermost + * exception range of the following block. + * + *----------------------------------------------------------------------------- + */ + +static int +BuildExceptionRanges(AssembleEnv* assemEnvPtr) + /* Assembler environment */ +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ +#if 0 + Tcl_Interp* interp = (Tcl_Interp*) envPtr->iPtr; + /* Tcl interpreter */ +#endif + BasicBlock* bbPtr; /* Current basic block */ + BasicBlock* prevPtr = NULL; /* Previous basic block */ + int catchDepth = 0; /* Current catch depth */ + int maxCatchDepth= 0; /* Maximum catch depth in the program */ + BasicBlock** catches; /* Stack of catches in progress */ + int* catchIndices; /* Indices of the exception ranges + * of catches in progress */ + int i; + + /* + * Determine the max catch depth for the entire assembly script + * (excluding embedded eval's and expr's, which will be handled later). + */ + for (bbPtr = assemEnvPtr->head_bb; bbPtr != NULL; bbPtr=bbPtr->successor1) { + if (bbPtr->catchDepth > maxCatchDepth) { + maxCatchDepth = bbPtr->catchDepth; + } + } + + /* Allocate memory for a stack of active catches */ + + catches = (BasicBlock**) ckalloc(maxCatchDepth * sizeof(BasicBlock*)); + catchIndices = (int*) ckalloc(maxCatchDepth * sizeof(int)); + for (i = 0; i < maxCatchDepth; ++i) { + catches[i] = NULL; + catchIndices[i] = -1; + } + + /* Walk through the basic blocks and manage exception ranges. */ + + for (bbPtr = assemEnvPtr->head_bb; bbPtr != NULL; bbPtr=bbPtr->successor1) { + + /*fprintf(stderr, "block %p line %d byte %#x enclosing %p state %d" + " depth %d\n", + bbPtr, bbPtr->startLine, bbPtr->startOffset, + bbPtr->enclosingCatch, bbPtr->catchState, bbPtr->catchDepth); + fflush(stderr); */ + + UnstackExpiredCatches(envPtr, bbPtr, catchDepth, + catches, catchIndices); + LookForFreshCatches(bbPtr, catches); + StackFreshCatches(assemEnvPtr, bbPtr, catchDepth, + catches, catchIndices); + + /* If the last block was a 'begin catch', fill in the exception range */ + + catchDepth = bbPtr->catchDepth; + if (prevPtr != NULL + && (prevPtr->flags & BB_BEGINCATCH)) { + /*fprintf(stderr, "beginCatch at %d (depth=%d) " + "is exception range %d\n", + bbPtr->startOffset, catchDepth-1, + catchIndices[catchDepth-1]); fflush(stderr); */ + TclStoreInt4AtPtr(catchIndices[catchDepth-1], + envPtr->codeStart + bbPtr->startOffset - 4); + } + + prevPtr = bbPtr; + } + + if (catchDepth != 0) { + Tcl_Panic("unclosed catch at end of code in " + "tclAssembly.c:BuildExceptionRanges, can't happen"); + } + + return TCL_OK; +} + +/* + *----------------------------------------------------------------------------- + * + * UnstackExpiredCatches -- + * + * Unstacks and closes the exception ranges for any catch contexts that + * were active in the previous basic block but are inactive in the + * current one. + * + *----------------------------------------------------------------------------- + */ + +static void +UnstackExpiredCatches(CompileEnv* envPtr, + /* Compilation environment */ + BasicBlock* bbPtr, + /* Basic block being processed */ + int catchDepth, + /* Depth of nesting of catches prior to + * entry to this block */ + BasicBlock** catches, + /* Array of catch contexts */ + int* catchIndices) + /* Indices of the exception ranges + * corresponding to the catch contexts */ +{ + + ExceptionRange* range; /* Exception range for a specific catch */ + BasicBlock* catch; /* Catch block being examined */ + BasicBlockCatchState catchState; + /* State of the code relative to + * the catch block being examined + * ("in catch" or "caught") */ + + /* + * Unstack any catches that are deeper than the nesting level of + * the basic block being entered. + */ + + while (catchDepth > bbPtr->catchDepth) { + --catchDepth; + /* fprintf(stderr, "unstack exception range %d\n", + catchIndices[catchDepth]); fflush(stderr); */ + range = envPtr->exceptArrayPtr + catchIndices[catchDepth]; + range->numCodeBytes = bbPtr->startOffset - range->codeOffset; + catches[catchDepth] = NULL; + catchIndices[catchDepth] = -1; + } + + /* + * Unstack any catches that don't match the basic block being entered, + * either because they are no longer part of the context, or because + * the context has changed from INCATCH to CAUGHT. + */ + + catchState = bbPtr->catchState; + catch = bbPtr->enclosingCatch; + while (catchDepth > 0) { + --catchDepth; + if (catches[catchDepth] != NULL) { + if (catches[catchDepth] != catch + || catchState >= BBCS_DONECATCH) { + /* fprintf(stderr, "unstack changed exception range %d\n", + catchIndices[catchDepth]); fflush(stderr); */ + range = envPtr->exceptArrayPtr + catchIndices[catchDepth]; + range->numCodeBytes = bbPtr->startOffset - range->codeOffset; + catches[catchDepth] = NULL; + catchIndices[catchDepth] = -1; + } + catchState = catch->catchState; + catch = catch->enclosingCatch; + } + } +} + +/* + *----------------------------------------------------------------------------- + * + * LookForFreshCatches -- + * + * Determines whether a basic block being entered needs any exception + * ranges that are not already stacked. + * + * Does not create the ranges: this procedure iterates from the innermost + * catch outward, but exception ranges must be created from the outermost + * catch inward. + * + *----------------------------------------------------------------------------- + */ + +static void +LookForFreshCatches(BasicBlock* bbPtr, + /* Basic block being entered */ + BasicBlock** catches) + /* Array of catch contexts that are + * already entered */ +{ + BasicBlockCatchState catchState; + /* State ("in catch" or "caught" of + * the current catch. */ + BasicBlock* catch; /* Current enclosing catch */ + int catchDepth; /* Nesting depth of the current catch */ + + catchState = bbPtr->catchState; + catch = bbPtr->enclosingCatch; + catchDepth = bbPtr->catchDepth; + while (catchDepth > 0) { + --catchDepth; + if (catches[catchDepth] != catch && catchState < BBCS_DONECATCH) { + /* fprintf(stderr, "new exception range needed for %s.\n", + Tcl_GetString(catch->jumpTarget)); */ + catches[catchDepth] = catch; + /* } else { + fprintf(stderr, "new exception range not needed for %s\n", + Tcl_GetString(catch->jumpTarget));*/ + } + catchState = catch->catchState; + catch = catch->enclosingCatch; + } +} + +/* + *-----------------------------------------------------------------------------\ * + * StackFreshCatches -- + * + * Make ExceptionRange records for any catches that are in the + * basic block being entered and were not in the previous basic block. + * + *----------------------------------------------------------------------------- + */ + +static void +StackFreshCatches(AssembleEnv* assemEnvPtr, + /* Assembly environment */ + BasicBlock* bbPtr, + /* Basic block being processed */ + int catchDepth, + /* Depth of nesting of catches prior to + * entry to this block */ + BasicBlock** catches, + /* Array of catch contexts */ + int* catchIndices) + /* Indices of the exception ranges + * corresponding to the catch contexts */ +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + ExceptionRange* range; /* Exception range for a specific catch */ + BasicBlock* catch; /* Catch block being examined */ + JumpLabel* l; /* Error exit from the catch block */ + + catchDepth = 0; + + /* + * Iterate through the enclosing catch blocks from the outside in, + * looking for ones that don't have exception ranges (and are uncaught) + */ + + for (catchDepth = 0; catchDepth < bbPtr->catchDepth; ++catchDepth) { + if (catchIndices[catchDepth] == -1 && catches[catchDepth] != NULL) { + + /* Create an exception range for a block that needs one. */ + + catch = catches[catchDepth]; + catchIndices[catchDepth] = + TclCreateExceptRange(CATCH_EXCEPTION_RANGE, envPtr); + /* fprintf(stderr, "stack exception range %d at depth %d for %s\n", + catchIndices[catchDepth], catchDepth, + Tcl_GetString(catch->jumpTarget)); fflush(stderr); */ + range = envPtr->exceptArrayPtr + catchIndices[catchDepth]; + range->nestingLevel = envPtr->exceptDepth + catchDepth; + envPtr->maxExceptDepth = + TclMax(range->nestingLevel + 1, envPtr->maxExceptDepth); + range->codeOffset = bbPtr->startOffset; + l = FindLabel(assemEnvPtr, catch->jumpTarget); + if (!l->isDefined) { + Tcl_Panic("undefined label in tclAssembly.c:" + "BuildExceptionRanges, can't happen"); + } else { + range->catchOffset = l->offset; + } + } + } +} + +/* + *----------------------------------------------------------------------------- + * + * RestoreEmbeddedExceptionRanges -- + * + * Processes an assembly script, replacing any exception ranges that + * were present in embedded code. + * + *----------------------------------------------------------------------------- + */ + +static void +RestoreEmbeddedExceptionRanges(AssembleEnv* assemEnvPtr) + /* Assembler environment */ +{ + CompileEnv* envPtr = assemEnvPtr->envPtr; + /* Compilation environment */ + BasicBlock* bbPtr; /* Current basic block */ + int rangeBase; /* Base of the foreign exception ranges + * when they are reinstalled */ + int rangeIndex; /* Index of the current foreign exception + * range as reinstalled */ + ExceptionRange* range; /* Current foreign exception range */ + unsigned char opcode; /* Current instruction's opcode */ + unsigned int catchIndex; /* Index of the exception range to which + * the current instruction refers */ + int i; + + /* Walk the basic blocks looking for exceptions in embedded scripts */ + + for (bbPtr = assemEnvPtr->head_bb; + bbPtr != NULL; + bbPtr = bbPtr->successor1) { + if (bbPtr->foreignExceptionCount != 0) { + /* fprintf(stderr, "basic block %p has %d foreign exception ranges" + " starting at %d\n", + bbPtr, bbPtr->foreignExceptionCount, + bbPtr->foreignExceptionBase); fflush(stderr); */ + + /* + * Reinstall the embedded exceptions and track their + * nesting level + */ + rangeBase = envPtr->exceptArrayNext; + /* fprintf(stderr, "next exception at %d\n", rangeBase); */ + for (i = 0; i < bbPtr->foreignExceptionCount; ++i) { + range = bbPtr->foreignExceptions + i; + rangeIndex = TclCreateExceptRange(range->type, envPtr); + /* fprintf(stderr, "restore range %d -> %d\n", + i + bbPtr->foreignExceptionBase, + rangeIndex); fflush(stderr); */ + range->nestingLevel += envPtr->exceptDepth + bbPtr->catchDepth; + memcpy(envPtr->exceptArrayPtr + rangeIndex, range, + sizeof(ExceptionRange)); + if (range->nestingLevel >= envPtr->maxExceptDepth) { + envPtr->maxExceptDepth = range->nestingLevel + 1; + } + } + + /* + * Walk through the bytecode of the basic block, and relocate + * INST_BEGIN_CATCH4 instructions to the new locations + */ + i = bbPtr->startOffset; + while (i < bbPtr->successor1->startOffset) { + opcode = envPtr->codeStart[i]; + if (opcode == INST_BEGIN_CATCH4) { + catchIndex = TclGetUInt4AtPtr(envPtr->codeStart + i + 1); + /* fprintf(stderr, "pc %d exception %d\n", + i, catchIndex); fflush(stderr); */ + if (catchIndex >= bbPtr->foreignExceptionBase + && catchIndex < (bbPtr->foreignExceptionBase + + bbPtr->foreignExceptionCount)) { + catchIndex -= bbPtr->foreignExceptionBase; + catchIndex += rangeBase; + /* fprintf(stderr, + "alter catch at %d to refer to range %d\n", + i, catchIndex); fflush(stderr); */ + TclStoreInt4AtPtr(catchIndex, + envPtr->codeStart + i + 1); + } + } + i += tclInstructionTable[opcode].numBytes; + } + } + } + +} + +/* + *----------------------------------------------------------------------------- + * + * ResetVisitedBasicBlocks -- + * + * Turns off the 'visited' flag in all basic blocks at the conclusion + * of a pass. + * + *----------------------------------------------------------------------------- + */ + +static void +ResetVisitedBasicBlocks(AssembleEnv* assemEnvPtr) +{ + BasicBlock* block; + for (block = assemEnvPtr->head_bb; block != NULL; + block = block->successor1) { + block->flags &= ~BB_VISITED; + } +} + +/* + *----------------------------------------------------------------------------- + * * AddBasicBlockRangeToErrorInfo -- * * Updates the error info of the Tcl interpreter to show a given diff --git a/generic/tclAssembly.h b/generic/tclAssembly.h index 1f67e4f..182e210 100644 --- a/generic/tclAssembly.h +++ b/generic/tclAssembly.h @@ -3,6 +3,24 @@ #include "tclCompile.h" +/* State identified for a basic block's catch context */ + +typedef enum BasicBlockCatchState { + BBCS_UNKNOWN = 0, /* Catch context has not yet been identified */ + BBCS_NONE, /* Block is outside of any catch */ + BBCS_INCATCH, /* Block is within a catch context */ + BBCS_DONECATCH, /* Block is nominally within a catch context + * but has passed a 'doneCatch' directive + * and wants exceptions to propagate. */ + BBCS_CAUGHT, /* Block is within a catch context and + * may be executed after an exception fires */ +} BasicBlockCatchState; + +typedef struct CodeRange { + int startOffset; /* Start offset in the bytecode array */ + int endOffset; /* End offset in the bytecode array */ +} CodeRange; + /* * Structure that defines a basic block - a linear sequence of bytecode * instructions with no jumps in or out. @@ -17,10 +35,6 @@ typedef struct BasicBlock { int jumpLine; /* Line number in the input script of the * 'jump' instruction that ends the block, * or -1 if there is no jump */ - int may_fall_thru; /* Flag == 1 if control passes from this - * block to its successor. */ - int visited; /* Flag==1 if this block has been visited - * in the stack checker*/ struct BasicBlock* predecessor; /* Predecessor of this block in the * spanning tree */ @@ -37,13 +51,55 @@ typedef struct BasicBlock { int maxStackDepth; /* High-water relative stack depth */ int finalStackDepth; /* Relative stack depth on exit */ + enum BasicBlockCatchState catchState; + /* State of the block for 'catch' analysis */ + int catchDepth; /* Number of nested catches in which the + * basic block appears */ + struct BasicBlock* enclosingCatch; + /* BasicBlock structure of the last + * startCatch executed on a path to this + * block, or NULL if there is no + * enclosing catch */ + + int foreignExceptionBase; /* Base index of foreign exceptions */ + int foreignExceptionCount; /* Count of foreign exceptions */ + ExceptionRange* foreignExceptions; + /* ExceptionRange structures for + * exception ranges belonging to embedded + * scripts and expressions in this block */ + + int flags; /* Boolean flags */ + } BasicBlock; +/* Flags that pertain to a basic block */ + +enum BasicBlockFlags { + BB_VISITED = (1 << 0), /* Block has been visited in the current + * traversal */ + BB_FALLTHRU = (1 << 1), /* Control may pass from this block to + * a successor */ + BB_BEGINCATCH = (1 << 2), /* Block ends with a 'beginCatch' instruction, + * marking it as the start of a 'catch' + * sequence. The 'jumpTarget' is the exception + * exit from the catch block. */ + BB_DONECATCH = (1 << 3), /* Block commences with a 'doneCatch' + * directive, indicating that the program + * is finished with the body of a catch block. + */ + BB_ENDCATCH = (1 << 4), /* Block ends with an 'endCatch' instruction, + * unwinding the catch from the exception + * stack. */ +}; + /* Source instruction type recognized by the assembler */ typedef enum TalInstType { ASSEM_1BYTE, /* Fixed arity, 1-byte instruction */ + ASSEM_BEGIN_CATCH, + /* Begin catch: one 4-byte jump offset to be converted + * to appropriate exception ranges */ ASSEM_BOOL, /* One Boolean operand */ ASSEM_BOOL_LVT4,/* One Boolean, one 4-byte LVT ref. */ ASSEM_CONCAT1, /* 1-byte unsigned-integer operand count, must be @@ -55,6 +111,11 @@ typedef enum TalInstType { ASSEM_DICT_UNSET, /* specifies key count and LVT index, consumes N operands, * produces 1, N > 0 */ + ASSEM_DONECATCH,/* Directive indicating that the body of a catch block + * is complete. Generates no instructions, affects only + * the exception ranges. */ + ASSEM_END_CATCH,/* End catch. No args. Exception range popped from stack + * and stack pointer restored. */ ASSEM_EVAL, /* 'eval' - evaluate a constant script (by compiling it * in line with the assembly code! I love Tcl!) */ ASSEM_INDEX, /* 4 byte operand, integer or end-integer */ @@ -131,6 +192,10 @@ typedef struct AssembleEnv { BasicBlock* curr_bb; /* Current basic block */ int maxDepth; /* Maximum stack depth encountered */ + + int curCatchDepth; /* Current depth of catches */ + int maxCatchDepth; /* Maximum depth of catches encountered */ + int flags; /* Compilation flags (TCL_EVAL_DIRECT) */ } AssembleEnv; |