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-rw-r--r--generic/tclCompile.c136
1 files changed, 62 insertions, 74 deletions
diff --git a/generic/tclCompile.c b/generic/tclCompile.c
index a150fc2..dcd74f1 100644
--- a/generic/tclCompile.c
+++ b/generic/tclCompile.c
@@ -1755,7 +1755,6 @@ CompileExpanded(
int wordIdx = 0;
DefineLineInformation;
-
StartExpanding(envPtr);
if (cmdObj) {
CompileCmdLiteral(interp, cmdObj, envPtr);
@@ -1787,19 +1786,17 @@ CompileExpanded(
}
/*
- * The stack depth during argument expansion can only be
- * managed at runtime, as the number of elements in the
- * expanded lists is not known at compile time. We adjust here
- * the stack depth estimate so that it is correct after the
- * command with expanded arguments returns.
+ * The stack depth during argument expansion can only be managed at
+ * runtime, as the number of elements in the expanded lists is not known
+ * at compile time. We adjust here the stack depth estimate so that it is
+ * correct after the command with expanded arguments returns.
*
- * The end effect of this command's invocation is that all the
- * words of the command are popped from the stack, and the
- * result is pushed: the stack top changes by (1-wordIdx).
+ * The end effect of this command's invocation is that all the words of
+ * the command are popped from the stack, and the result is pushed: the
+ * stack top changes by (1-wordIdx).
*
- * Note that the estimates are not correct while the command
- * is being prepared and run, INST_EXPAND_STKTOP is not
- * stack-neutral in general.
+ * Note that the estimates are not correct while the command is being
+ * prepared and run, INST_EXPAND_STKTOP is not stack-neutral in general.
*/
TclEmitInvoke(envPtr, INST_INVOKE_EXPANDED, wordIdx);
@@ -1816,8 +1813,8 @@ CompileCmdCompileProc(
DefineLineInformation;
/*
- * Emit of the INST_START_CMD instruction is controlled by
- * the value of envPtr->atCmdStart:
+ * Emit of the INST_START_CMD instruction is controlled by the value of
+ * envPtr->atCmdStart:
*
* atCmdStart == 2 : We are not using the INST_START_CMD instruction.
* atCmdStart == 1 : INST_START_CMD was the last instruction emitted.
@@ -1848,9 +1845,10 @@ CompileCmdCompileProc(
if (TCL_OK == TclAttemptCompileProc(interp, parsePtr, 1, cmdPtr, envPtr)) {
if (incrOffset >= 0) {
/*
- * We successfully compiled a command. Increment the number
- * of commands that start at the currently active INST_START_CMD.
+ * We successfully compiled a command. Increment the number of
+ * commands that start at the currently active INST_START_CMD.
*/
+
unsigned char *incrPtr = envPtr->codeStart + incrOffset;
unsigned char *startPtr = incrPtr - 5;
@@ -1866,9 +1864,9 @@ CompileCmdCompileProc(
envPtr->codeNext -= unwind; /* Unwind INST_START_CMD */
/*
- * Throw out any line information generated by the failed
- * compile attempt.
+ * Throw out any line information generated by the failed compile attempt.
*/
+
while (mapPtr->nuloc - 1 > eclIndex) {
mapPtr->nuloc--;
ckfree(mapPtr->loc[mapPtr->nuloc].line);
@@ -1876,11 +1874,11 @@ CompileCmdCompileProc(
}
/*
- * Reset the index of next command.
- * Toss out any from failed nested partial compiles.
+ * Reset the index of next command. Toss out any from failed nested
+ * partial compiles.
*/
- envPtr->numCommands = mapPtr->nuloc;
+ envPtr->numCommands = mapPtr->nuloc;
return TCL_ERROR;
}
@@ -1912,11 +1910,10 @@ CompileCommandTokens(
parsePtr->commandStart - envPtr->source, startCodeOffset);
/*
- * TIP #280. Scan the words and compute the extended location
- * information. The map first contain full per-word line
- * information for use by the compiler. This is later replaced by
- * a reduced form which signals non-literal words, stored in
- * 'wlines'.
+ * TIP #280. Scan the words and compute the extended location information.
+ * The map first contain full per-word line information for use by the
+ * compiler. This is later replaced by a reduced form which signals
+ * non-literal words, stored in 'wlines'.
*/
EnterCmdWordData(eclPtr, parsePtr->commandStart - envPtr->source,
@@ -1938,8 +1935,8 @@ CompileCommandTokens(
cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, cmdObj);
if (cmdPtr) {
/*
- * Found a command. Test the ways we can be told
- * not to attempt to compile it.
+ * Found a command. Test the ways we can be told not to attempt
+ * to compile it.
*/
if ((cmdPtr->compileProc == NULL)
|| (cmdPtr->nsPtr->flags & NS_SUPPRESS_COMPILATION)
@@ -1983,8 +1980,8 @@ CompileCommandTokens(
(envPtr->codeNext-envPtr->codeStart) - startCodeOffset);
/*
- * TIP #280: Free full form of per-word line data and insert the
- * reduced form now
+ * TIP #280: Free full form of per-word line data and insert the reduced
+ * form now
*/
envPtr->line = cmdLine;
@@ -2069,20 +2066,20 @@ TclCompileScript(
if (parse.numWords == 0) {
/*
- * The "command" parsed has no words. In this case
- * we can skip the rest of the loop body. With no words,
- * clearly CompileCommandTokens() has nothing to do. Since
- * the parser aggressively sucks up leading comment and white
- * space, including newlines, parse.commandStart must be
- * pointing at either the end of script, or a command-terminating
- * semi-colon. In either case, the TclAdvance*() calls have
- * nothing to do. Finally, when no words are parsed, no
- * tokens have been allocated at parse.tokenPtr so there's
- * also nothing for Tcl_FreeParse() to do.
+ * The "command" parsed has no words. In this case we can skip
+ * the rest of the loop body. With no words, clearly
+ * CompileCommandTokens() has nothing to do. Since the parser
+ * aggressively sucks up leading comment and white space,
+ * including newlines, parse.commandStart must be pointing at
+ * either the end of script, or a command-terminating semi-colon.
+ * In either case, the TclAdvance*() calls have nothing to do.
+ * Finally, when no words are parsed, no tokens have been
+ * allocated at parse.tokenPtr so there's also nothing for
+ * Tcl_FreeParse() to do.
*
* The advantage of this shortcut is that CompileCommandTokens()
- * can be written with an assumption that parse.numWords > 0,
- * with the implication the CCT() always generates bytecode.
+ * can be written with an assumption that parse.numWords > 0, with
+ * the implication the CCT() always generates bytecode.
*/
continue;
}
@@ -2101,23 +2098,25 @@ TclCompileScript(
if (lastCmdIdx == -1) {
/*
- * Compiling the script yielded no bytecode. The script must be
- * all whitespace, comments, and empty commands. Such scripts
- * are defined to successfully produce the empty string result,
- * so we emit the simple bytecode that makes that happen.
+ * Compiling the script yielded no bytecode. The script must be all
+ * whitespace, comments, and empty commands. Such scripts are defined
+ * to successfully produce the empty string result, so we emit the
+ * simple bytecode that makes that happen.
*/
+
PushStringLiteral(envPtr, "");
} else {
/*
* We compiled at least one command to bytecode. The routine
* CompileCommandTokens() follows the bytecode of each compiled
- * command with an INST_POP, so that stack balance is maintained
- * when several commands are in sequence. (The result of each
- * command is thrown away before moving on to the next command).
- * For the last command compiled, we need to undo that INST_POP
- * so that the result of the last command becomes the result of
- * the script. The code here removes that trailing INST_POP.
+ * command with an INST_POP, so that stack balance is maintained when
+ * several commands are in sequence. (The result of each command is
+ * thrown away before moving on to the next command). For the last
+ * command compiled, we need to undo that INST_POP so that the result
+ * of the last command becomes the result of the script. The code
+ * here removes that trailing INST_POP.
*/
+
envPtr->cmdMapPtr[lastCmdIdx].numCodeBytes--;
envPtr->codeNext--;
envPtr->currStackDepth++;
@@ -3353,9 +3352,9 @@ TclAddLoopContinueFixup(
*
* TclCleanupStackForBreakContinue --
*
- * Ditch the extra elements from the auxiliary stack and the main
- * stack. How to do this exactly depends on whether there are any
- * elements on the auxiliary stack to pop.
+ * Ditch the extra elements from the auxiliary stack and the main stack.
+ * How to do this exactly depends on whether there are any elements on
+ * the auxiliary stack to pop.
*
* ---------------------------------------------------------------------
*/
@@ -3369,23 +3368,16 @@ TclCleanupStackForBreakContinue(
int toPop = envPtr->expandCount - auxPtr->expandTarget;
if (toPop > 0) {
- while (toPop > 0) {
+ while (toPop --> 0) {
TclEmitOpcode(INST_EXPAND_DROP, envPtr);
- toPop--;
}
TclAdjustStackDepth(auxPtr->expandTargetDepth - envPtr->currStackDepth,
envPtr);
- toPop = auxPtr->expandTargetDepth - auxPtr->stackDepth;
- while (toPop > 0) {
- TclEmitOpcode(INST_POP, envPtr);
- toPop--;
- }
- } else {
- toPop = envPtr->currStackDepth - auxPtr->stackDepth;
- while (toPop > 0) {
- TclEmitOpcode(INST_POP, envPtr);
- toPop--;
- }
+ envPtr->currStackDepth = auxPtr->expandTargetDepth;
+ }
+ toPop = envPtr->currStackDepth - auxPtr->stackDepth;
+ while (toPop --> 0) {
+ TclEmitOpcode(INST_POP, envPtr);
}
envPtr->currStackDepth = savedStackDepth;
}
@@ -4062,11 +4054,9 @@ TclEmitInvoke(
if (auxBreakPtr != NULL) {
TclAdjustStackDepth(-1, envPtr);
- exceptAux->stackDepth = auxBreakPtr->stackDepth;
- exceptAux->expandTarget = auxBreakPtr->expandTarget;
ExceptionRangeTarget(envPtr, loopRange, breakOffset);
- TclCleanupStackForBreakContinue(envPtr, exceptAux);
+ TclCleanupStackForBreakContinue(envPtr, auxBreakPtr);
TclAddLoopBreakFixup(envPtr, auxBreakPtr);
envPtr->currStackDepth = savedStackDepth;
@@ -4075,11 +4065,9 @@ TclEmitInvoke(
if (auxContinuePtr != NULL) {
TclAdjustStackDepth(-1, envPtr);
- exceptAux->stackDepth = auxContinuePtr->stackDepth;
- exceptAux->expandTarget = auxContinuePtr->expandTarget;
ExceptionRangeTarget(envPtr, loopRange, continueOffset);
- TclCleanupStackForBreakContinue(envPtr, exceptAux);
+ TclCleanupStackForBreakContinue(envPtr, auxContinuePtr);
TclAddLoopContinueFixup(envPtr, auxContinuePtr);
envPtr->currStackDepth = savedStackDepth;