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envelope-from=dave.anglin@bell.net; helo=mtlfep01.bell.net X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, NICE_REPLY_A=-0.265, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-guile@gnu.org List-Id: "Bug reports for GUILE, GNU's Ubiquitous Extension Language" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guile-bounces+guile-bugs=m.gmane-mx.org@gnu.org Original-Sender: "bug-guile" Xref: news.gmane.io gmane.lisp.guile.bugs:9980 Archived-At: On 2021-02-08 6:24 p.m., John David Anglin wrote: > We need to investigate why scm_sum is passed "x=x@entry=0x0".   SCM_BIGP (x) will fault on it.   Maybe SP_REF is broken. To be more specific, this is the type of sp: (gdb) ptype sp type = union scm_vm_stack_element {     uintptr_t as_uint;     uint32_t *as_vcode;     uint8_t *as_mcode;     SCM as_scm;     double as_f64;     uint64_t as_u64;     int64_t as_s64;     void *as_ptr;     scm_t_bits as_bits; } * (gdb) p/x &((union scm_vm_stack_element *)$r26)[0].as_scm $11 = 0xf34147f0 (gdb) p/x &((union scm_vm_stack_element *)$r26)[1].as_scm $12 = 0xf34147f8 (gdb) x/x 0xf34147f0 0xf34147f0:     0x00000001 (gdb) x/x 0xf34147f8 0xf34147f8:     0x0090020d (gdb) p/x ((union scm_vm_stack_element *)$r26)[1].as_scm $13 = 0x90020d (gdb) p/x ((union scm_vm_stack_element *)$r26)[0].as_scm $14 = 0x1 (gdb) x/8x 0xf34147f0 0xf34147f0:     0x00000001      0x00002c56      0x0090020d      0x0000097c 0xf3414800:     0x00000007      0x00000c83      0x0000097d      0x000d007f There are endian aspects to consider in accessing the scm_vm_stack_element struct. Dave -- John David Anglin dave.anglin@bell.net