[issue41215] AIX: build fails for xlc/xlC since new PEG parser

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

Ok, I have investigated more and it seems that XLC is miscompiling the keyword 
list. For instance, if you add:

index 9d3ac575df..70d431e6be 100644
--- a/Parser/pegen/parse.c
+++ b/Parser/pegen/parse.c
@@ -1,6 +1,6 @@
-// @generated by pegen.py from ./Grammar/python.gram
 #include "pegen.h"

+// @generated by pegen.py from ./Grammar/python.gram
 #if defined(Py_DEBUG) && defined(Py_BUILD_CORE)
 extern int Py_DebugFlag;
 #define D(x) if (Py_DebugFlag) x;
@@ -24735,7 +24735,12 @@ _PyPegen_parse(Parser *p)
     // Initialize keywords
     p->keywords = reserved_keywords;
     p->n_keyword_lists = n_keyword_lists;
-
+    for (int s=0; s<p->n_keyword_lists;s++) {
+        KeywordToken *kk = p->keywords[s];
+        if (kk) {
+            printf("--> %i %.*s\n", s,s, kk->str);
+        }
+    }
     // Run parser
     void *result = NULL;
     if (p->start_rule == Py_file_input) {


Before crashing, this will print the following:

--> 2 if
--> 3 del
--> 4 pass
--> 5 raise
--> 6 return
--> 7 finally
--> 8
--> 14 __peg_parser__
Segmentation fault (core dumped)

Notice that the entry for size 8 is missing. I don't understand why is missing 
because the data is static and there is an entry there:

static KeywordToken *reserved_keywords[] = {
    NULL,
    NULL,
    (KeywordToken[]) {
        {"if", 510},
        {"in", 518},
        {"as", 520},
        {"is", 527},
        {"or", 532},
        {NULL, -1},
    },
    (KeywordToken[]) {
        {"del", 503},
        {"try", 511},
        {"for", 517},
        {"def", 523},
        {"not", 526},
        {"and", 533},
        {NULL, -1},
    },
    (KeywordToken[]) {
        {"pass", 502},
        {"from", 514},
        {"elif", 515},
        {"else", 516},
        {"with", 519},
        {"True", 528},
        {"None", 530},
        {NULL, -1},
    },
    (KeywordToken[]) {
        {"raise", 501},
        {"yield", 504},
        {"break", 506},
        {"while", 512},
        {"class", 524},
        {"False", 529},
        {NULL, -1},
    },
    (KeywordToken[]) {
        {"return", 500},
        {"assert", 505},
        {"global", 508},
        {"import", 513},
        {"except", 521},
        {"lambda", 525},
        {NULL, -1},
    },
    (KeywordToken[]) {
        {"finally", 522},
        {NULL, -1},
    },
    (KeywordToken[]) {
        {"continue", 507},
        {"nonlocal", 509},
        {NULL, -1},
    },
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    (KeywordToken[]) {
        {"__peg_parser__", 531},
        {NULL, -1},
    },
};

----------

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