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https://github.com/jart/cosmopolitan.git
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d26d7ae0e4
Building o//third_party/python now takes 5 seconds on my PC This change works towards modifying Python to use runtime dispatching when appropriate. For example, when loading the magnums in the socket module, it's a good idea to check if the magnum is zero, because that means the local system platform doesn't support it.
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/* clang-format off */
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/* Grammar subroutines needed by parser */
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#include "third_party/python/Include/Python.h"
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#include "third_party/python/Include/pgenheaders.h"
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#include "third_party/python/Include/grammar.h"
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#include "third_party/python/Include/token.h"
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/* Return the DFA for the given type */
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dfa *
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PyGrammar_FindDFA(grammar *g, int type)
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{
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dfa *d;
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#if 1
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/* Massive speed-up */
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d = &g->g_dfa[type - NT_OFFSET];
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assert(d->d_type == type);
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return d;
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#else
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/* Old, slow version */
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int i;
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for (i = g->g_ndfas, d = g->g_dfa; --i >= 0; d++) {
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if (d->d_type == type)
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return d;
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}
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assert(0);
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/* NOTREACHED */
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#endif
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}
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const char *
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PyGrammar_LabelRepr(label *lb)
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{
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static char buf[100];
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if (lb->lb_type == ENDMARKER)
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return "EMPTY";
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else if (ISNONTERMINAL(lb->lb_type)) {
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if (lb->lb_str == NULL) {
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PyOS_snprintf(buf, sizeof(buf), "NT%d", lb->lb_type);
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return buf;
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}
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else
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return lb->lb_str;
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}
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else if (lb->lb_type < N_TOKENS) {
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if (lb->lb_str == NULL)
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return _PyParser_TokenNames[lb->lb_type];
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else {
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PyOS_snprintf(buf, sizeof(buf), "%.32s(%.32s)",
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_PyParser_TokenNames[lb->lb_type], lb->lb_str);
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return buf;
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}
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}
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else {
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Py_FatalError("invalid label");
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return NULL;
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}
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}
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