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author | dkf <donal.k.fellows@manchester.ac.uk> | 2013-06-20 11:05:20 (GMT) |
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committer | dkf <donal.k.fellows@manchester.ac.uk> | 2013-06-20 11:05:20 (GMT) |
commit | 2859532759626d4782896f4c151bf58a668da85b (patch) | |
tree | f14745f2116873e0bc99ff6fd376da56bb7e42cf /generic/tclDisassemble.c | |
parent | ccccb754c0f55dc8e8250ab8c3a2019c96c6add2 (diff) | |
download | tcl-2859532759626d4782896f4c151bf58a668da85b.zip tcl-2859532759626d4782896f4c151bf58a668da85b.tar.gz tcl-2859532759626d4782896f4c151bf58a668da85b.tar.bz2 |
Properly encode more operand types to reduce the number of special cases in the disassembler.
Diffstat (limited to 'generic/tclDisassemble.c')
-rw-r--r-- | generic/tclDisassemble.c | 164 |
1 files changed, 90 insertions, 74 deletions
diff --git a/generic/tclDisassemble.c b/generic/tclDisassemble.c index 7f0b11a..c7072ee 100644 --- a/generic/tclDisassemble.c +++ b/generic/tclDisassemble.c @@ -482,42 +482,52 @@ FormatInstruction( switch (instDesc->opTypes[i]) { case OPERAND_INT1: opnd = TclGetInt1AtPtr(pc+numBytes); numBytes++; - if (opCode == INST_JUMP1 || opCode == INST_JUMP_TRUE1 - || opCode == INST_JUMP_FALSE1) { - sprintf(suffixBuffer, "pc %u", pcOffset+opnd); - } Tcl_AppendPrintfToObj(bufferObj, "%+d ", opnd); break; case OPERAND_INT4: opnd = TclGetInt4AtPtr(pc+numBytes); numBytes += 4; - if (opCode == INST_JUMP4 || opCode == INST_JUMP_TRUE4 - || opCode == INST_JUMP_FALSE4) { - sprintf(suffixBuffer, "pc %u", pcOffset+opnd); - } else if (opCode == INST_START_CMD) { - sprintf(suffixBuffer, "next cmd at pc %u", pcOffset+opnd); - } Tcl_AppendPrintfToObj(bufferObj, "%+d ", opnd); break; case OPERAND_UINT1: opnd = TclGetUInt1AtPtr(pc+numBytes); numBytes++; - if (opCode == INST_PUSH1) { - suffixObj = codePtr->objArrayPtr[opnd]; - } Tcl_AppendPrintfToObj(bufferObj, "%u ", (unsigned) opnd); break; - case OPERAND_AUX4: case OPERAND_UINT4: opnd = TclGetUInt4AtPtr(pc+numBytes); numBytes += 4; - if (opCode == INST_PUSH4) { - suffixObj = codePtr->objArrayPtr[opnd]; - } else if (opCode == INST_START_CMD && opnd != 1) { + if (opCode == INST_START_CMD) { sprintf(suffixBuffer+strlen(suffixBuffer), ", %u cmds start here", opnd); } Tcl_AppendPrintfToObj(bufferObj, "%u ", (unsigned) opnd); - if (instDesc->opTypes[i] == OPERAND_AUX4) { - auxPtr = &codePtr->auxDataArrayPtr[opnd]; + break; + case OPERAND_OFFSET1: + opnd = TclGetInt1AtPtr(pc+numBytes); numBytes++; + sprintf(suffixBuffer, "pc %u", pcOffset+opnd); + Tcl_AppendPrintfToObj(bufferObj, "%+d ", opnd); + break; + case OPERAND_OFFSET4: + opnd = TclGetInt4AtPtr(pc+numBytes); numBytes += 4; + if (opCode == INST_START_CMD) { + sprintf(suffixBuffer, "next cmd at pc %u", pcOffset+opnd); + } else { + sprintf(suffixBuffer, "pc %u", pcOffset+opnd); } + Tcl_AppendPrintfToObj(bufferObj, "%+d ", opnd); + break; + case OPERAND_LIT1: + opnd = TclGetUInt1AtPtr(pc+numBytes); numBytes++; + suffixObj = codePtr->objArrayPtr[opnd]; + Tcl_AppendPrintfToObj(bufferObj, "%u ", (unsigned) opnd); + break; + case OPERAND_LIT4: + opnd = TclGetUInt4AtPtr(pc+numBytes); numBytes += 4; + suffixObj = codePtr->objArrayPtr[opnd]; + Tcl_AppendPrintfToObj(bufferObj, "%u ", (unsigned) opnd); + break; + case OPERAND_AUX4: + opnd = TclGetUInt4AtPtr(pc+numBytes); numBytes += 4; + Tcl_AppendPrintfToObj(bufferObj, "%u ", (unsigned) opnd); + auxPtr = &codePtr->auxDataArrayPtr[opnd]; break; case OPERAND_IDX4: opnd = TclGetInt4AtPtr(pc+numBytes); numBytes += 4; @@ -896,54 +906,67 @@ DisassembleByteCodeAsDicts( instructions = Tcl_NewObj(); for (pc=codePtr->codeStart; pc<codePtr->codeStart+codePtr->numCodeBytes;){ const InstructionDesc *instDesc = &tclInstructionTable[*pc]; + int address = pc - codePtr->codeStart; inst = Tcl_NewObj(); - Tcl_ListObjAppendElement(NULL, inst, - Tcl_NewStringObj(instDesc->name, -1)); + Tcl_ListObjAppendElement(NULL, inst, Tcl_NewStringObj( + instDesc->name, -1)); opnd = pc + 1; for (i=0 ; i<instDesc->numOperands ; i++) { switch (instDesc->opTypes[i]) { case OPERAND_INT1: val = TclGetInt1AtPtr(opnd); opnd += 1; - if (*pc == INST_JUMP1 || *pc == INST_JUMP_TRUE1 - || *pc == INST_JUMP_FALSE1) { - Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( - "pc %d", pc+val-codePtr->codeStart)); - } else { - Tcl_ListObjAppendElement(NULL, inst, Tcl_NewIntObj(val)); - } - break; + goto formatNumber; + case OPERAND_UINT1: + val = TclGetUInt1AtPtr(opnd); + opnd += 1; + goto formatNumber; case OPERAND_INT4: val = TclGetInt4AtPtr(opnd); opnd += 4; - if (*pc == INST_JUMP4 || *pc == INST_JUMP_TRUE4 - || *pc == INST_JUMP_FALSE4 || *pc == INST_START_CMD) { - Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( - "pc %d", pc+val-codePtr->codeStart)); - } else { - Tcl_ListObjAppendElement(NULL, inst, Tcl_NewIntObj(val)); - } + goto formatNumber; + case OPERAND_UINT4: + val = TclGetUInt4AtPtr(opnd); + opnd += 4; + formatNumber: + Tcl_ListObjAppendElement(NULL, inst, Tcl_NewIntObj(val)); break; - case OPERAND_UINT1: + + case OPERAND_OFFSET1: + val = TclGetInt1AtPtr(opnd); + opnd += 1; + goto formatAddress; + case OPERAND_OFFSET4: + val = TclGetInt4AtPtr(opnd); + opnd += 4; + formatAddress: + Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( + "pc %d", address + val)); + break; + + case OPERAND_LIT1: val = TclGetUInt1AtPtr(opnd); opnd += 1; - if (*pc == INST_PUSH1) { - Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( - "@%d", val)); - } else { - Tcl_ListObjAppendElement(NULL, inst, Tcl_NewIntObj(val)); - } + goto formatLiteral; + case OPERAND_LIT4: + val = TclGetUInt4AtPtr(opnd); + opnd += 4; + formatLiteral: + Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( + "@%d", val)); break; - case OPERAND_UINT4: + + case OPERAND_LVT1: + val = TclGetUInt1AtPtr(opnd); + opnd += 1; + goto formatVariable; + case OPERAND_LVT4: val = TclGetUInt4AtPtr(opnd); opnd += 4; - if (*pc == INST_PUSH4) { - Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( - "@%d", val)); - } else { - Tcl_ListObjAppendElement(NULL, inst, Tcl_NewIntObj(val)); - } + formatVariable: + Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( + "%%%d", val)); break; case OPERAND_IDX4: val = TclGetInt4AtPtr(opnd); @@ -952,37 +975,24 @@ DisassembleByteCodeAsDicts( Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( ".%d", val)); } else if (val == -2) { - Tcl_ListObjAppendElement(NULL, inst, - Tcl_NewStringObj(".end", -1)); + Tcl_ListObjAppendElement(NULL, inst, Tcl_NewStringObj( + ".end", -1)); } else { - Tcl_ListObjAppendElement(NULL, inst, - Tcl_ObjPrintf(".end-%d", -2-val)); + Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( + ".end-%d", -2-val)); } break; - case OPERAND_LVT1: - val = TclGetUInt1AtPtr(opnd); - opnd += 1; - Tcl_ListObjAppendElement(NULL, inst, - Tcl_ObjPrintf("%%%d", val)); - break; - case OPERAND_LVT4: - val = TclGetUInt4AtPtr(opnd); - opnd += 4; - Tcl_ListObjAppendElement(NULL, inst, - Tcl_ObjPrintf("%%%d", val)); - break; case OPERAND_AUX4: val = TclGetInt4AtPtr(opnd); opnd += 4; - Tcl_ListObjAppendElement(NULL, inst, - Tcl_ObjPrintf("?%d", val)); + Tcl_ListObjAppendElement(NULL, inst, Tcl_ObjPrintf( + "?%d", val)); break; case OPERAND_NONE: Tcl_Panic("opcode %d with more than zero 'no' operands", *pc); } } - Tcl_DictObjPut(NULL, instructions, - Tcl_NewIntObj(pc - codePtr->codeStart), inst); + Tcl_DictObjPut(NULL, instructions, Tcl_NewIntObj(address), inst); pc += instDesc->numBytes; } @@ -1039,18 +1049,23 @@ DisassembleByteCodeAsDicts( /* * Get the command information from the bytecode. + * + * The way these are encoded in the bytecode is non-trivial; the Decode + * macro (which updates its argument and returns the next decoded value) + * handles this so that the rest of the code does not. */ +#define Decode(ptr) \ + ((TclGetUInt1AtPtr(ptr) == 0xFF) \ + ? ((ptr)+=5 , TclGetInt4AtPtr((ptr)-4)) \ + : ((ptr)+=1 , TclGetInt1AtPtr((ptr)-1))) + commands = Tcl_NewObj(); codeOffPtr = codePtr->codeDeltaStart; codeLenPtr = codePtr->codeLengthStart; srcOffPtr = codePtr->srcDeltaStart; srcLenPtr = codePtr->srcLengthStart; codeOffset = sourceOffset = 0; -#define Decode(ptr) \ - ((TclGetUInt1AtPtr(ptr) == 0xFF) \ - ? ((ptr)+=5,TclGetInt4AtPtr((ptr)-4)) \ - : ((ptr)+=1,TclGetInt1AtPtr((ptr)-1))) for (i=0 ; i<codePtr->numCommands ; i++) { Tcl_Obj *cmd; @@ -1077,6 +1092,7 @@ DisassembleByteCodeAsDicts( Tcl_NewStringObj(codePtr->source+sourceOffset, sourceLength)); Tcl_ListObjAppendElement(NULL, commands, cmd); } + #undef Decode /* |