128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/* picoc interactive debugger */
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#include "interpreter.h"
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#define BREAKPOINT_HASH(p) (((unsigned long)(p)->FileName) ^ (((p)->Line << 16) | ((p)->CharacterPos << 16)))
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#ifdef DEBUGGER
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/* initialise the debugger by clearing the breakpoint table */
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void DebugInit(Picoc *pc)
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{
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TableInitTable(&pc->BreakpointTable, &pc->BreakpointHashTable[0],
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BREAKPOINT_TABLE_SIZE, true);
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pc->BreakpointCount = 0;
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}
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/* free the contents of the breakpoint table */
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void DebugCleanup(Picoc *pc)
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{
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struct TableEntry *Entry;
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struct TableEntry *NextEntry;
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int Count;
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for (Count = 0; Count < pc->BreakpointTable.Size; Count++) {
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for (Entry = pc->BreakpointHashTable[Count]; Entry != NULL;
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Entry = NextEntry) {
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NextEntry = Entry->Next;
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HeapFreeMem(pc, Entry);
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}
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}
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}
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/* search the table for a breakpoint */
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static struct TableEntry *DebugTableSearchBreakpoint(struct ParseState *Parser,
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int *AddAt)
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{
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struct TableEntry *Entry;
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Picoc *pc = Parser->pc;
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int HashValue = BREAKPOINT_HASH(Parser) % pc->BreakpointTable.Size;
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for (Entry = pc->BreakpointHashTable[HashValue];
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Entry != NULL; Entry = Entry->Next) {
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if (Entry->p.b.FileName == Parser->FileName &&
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Entry->p.b.Line == Parser->Line &&
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Entry->p.b.CharacterPos == Parser->CharacterPos)
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return Entry; /* found */
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}
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*AddAt = HashValue; /* didn't find it in the chain */
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return NULL;
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}
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/* set a breakpoint in the table */
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void DebugSetBreakpoint(struct ParseState *Parser)
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{
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int AddAt;
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struct TableEntry *FoundEntry = DebugTableSearchBreakpoint(Parser, &AddAt);
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Picoc *pc = Parser->pc;
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if (FoundEntry == NULL) {
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/* add it to the table */
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struct TableEntry *NewEntry = HeapAllocMem(pc, sizeof(*NewEntry));
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if (NewEntry == NULL)
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ProgramFailNoParser(pc, "(DebugSetBreakpoint) out of memory");
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NewEntry->p.b.FileName = Parser->FileName;
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NewEntry->p.b.Line = Parser->Line;
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NewEntry->p.b.CharacterPos = Parser->CharacterPos;
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NewEntry->Next = pc->BreakpointHashTable[AddAt];
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pc->BreakpointHashTable[AddAt] = NewEntry;
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pc->BreakpointCount++;
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}
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}
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/* delete a breakpoint from the hash table */
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int DebugClearBreakpoint(struct ParseState *Parser)
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{
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struct TableEntry **EntryPtr;
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Picoc *pc = Parser->pc;
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int HashValue = BREAKPOINT_HASH(Parser) % pc->BreakpointTable.Size;
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for (EntryPtr = &pc->BreakpointHashTable[HashValue];
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*EntryPtr != NULL; EntryPtr = &(*EntryPtr)->Next) {
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struct TableEntry *DeleteEntry = *EntryPtr;
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if (DeleteEntry->p.b.FileName == Parser->FileName &&
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DeleteEntry->p.b.Line == Parser->Line &&
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DeleteEntry->p.b.CharacterPos == Parser->CharacterPos) {
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*EntryPtr = DeleteEntry->Next;
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HeapFreeMem(pc, DeleteEntry);
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pc->BreakpointCount--;
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return true;
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}
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}
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return false;
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}
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/* before we run a statement, check if there's anything we have to
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do with the debugger here */
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void DebugCheckStatement(struct ParseState *Parser)
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{
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int DoBreak = false;
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int AddAt;
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Picoc *pc = Parser->pc;
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/* has the user manually pressed break? */
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if (pc->DebugManualBreak) {
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PlatformPrintf(pc->CStdOut, "break\n");
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DoBreak = true;
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pc->DebugManualBreak = false;
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}
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/* is this a breakpoint location? */
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if (Parser->pc->BreakpointCount != 0 &&
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DebugTableSearchBreakpoint(Parser, &AddAt) != NULL)
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DoBreak = true;
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/* handle a break */
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if (DoBreak) {
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PlatformPrintf(pc->CStdOut, "Handling a break\n");
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PicocParseInteractiveNoStartPrompt(pc, false);
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}
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}
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void DebugStep()
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{
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}
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#endif /* DEBUGGER */
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