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Refactored a bit

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This commit is contained in:
Dan Hirsch 2013-02-20 02:25:42 -05:00
parent b8314f6662
commit 55e5bc48ab
1 changed files with 40 additions and 9 deletions
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49
src/backends/regex.c
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@ -25,11 +25,15 @@ typedef struct HRVMThread_ {
uint16_t ip;
} HRVMThread;
// TODO(thequux): This function could really use a refactoring, at the
// very least, to split the two VMs.
void* h_rvm_run__m(HAllocator *mm__, HRVMProg *prog, const char* input, size_t len) {
HArena *arena = h_new_arena(mm__, 0);
HRVMTrace **heads_p = a_new(HRVMTrace*, prog->length),
**heads_n = a_new(HRVMTrace*, prog->length), **heads_t;
**heads_n = a_new(HRVMTrace*, prog->length),
**heads_t;
HRVMTrace *ret_trace;
uint8_t *insn_seen = a_new(uint8_t, prog->length); // 0 -> not seen, 1->processed, 2->queued
HRVMThread *ip_queue = a_new(HRVMThread, prog->length);
@ -61,7 +65,7 @@ void* h_rvm_run__m(HAllocator *mm__, HRVMProg *prog, const char* input, size_t l
}
memset(insn_seen, 0, prog->length); // no insns seen yet
if (!live_threads)
return NULL;
goto match_fail;
live_threads = 0;
for (ip_s = 0; ip_s < prog->length; ip_s++) {
ipq_top = 1;
@ -79,8 +83,9 @@ void* h_rvm_run__m(HAllocator *mm__, HRVMProg *prog, const char* input, size_t l
arg = prog->insns[THREAD.ip].arg;
switch(prog->insns[THREAD.ip].op) {
case RVM_ACCEPT:
// TODO: save current SVM pos, and jump to end
abort();
PUSH_SVM(SVM_ACCEPT, 0);
ret_trace = THREAD.trace;
goto run_trace;
case RVM_MATCH:
// Doesn't actually validate the "must be followed by MATCH
// or STEP. It should. Preproc perhaps?
@ -130,9 +135,35 @@ void* h_rvm_run__m(HAllocator *mm__, HRVMProg *prog, const char* input, size_t l
next_insn:
}
}
}
// No accept was reached.
match_fail:
h_delete_arena(arena);
return NULL;
run_trace:
// Invert the direction of the trace linked list.
ret_trace = invert_trace(ret_trace);
HParseResult *ret = run_trace(ret_trace, input, length);
// ret is in its own arena
h_delete_arena(arena);
return ret;
}
HRVMTrace *invert_trace(HRVMTrace *trace) {
HRVMTrace *next, *last = NULL;
if (!trace)
return NULL;
if (!trace->next)
return trace;
do {
HRVMTrace *next = trace->next;
trace->next = last;
last = trace;
trace = next;
} while (trace->next);
return trace;
}