From patchwork Wed Apr 15 19:47:32 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Marchi X-Patchwork-Id: 6237 Received: (qmail 52848 invoked by alias); 15 Apr 2015 19:47:53 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Delivered-To: mailing list gdb-patches@sourceware.org Received: (qmail 52821 invoked by uid 89); 15 Apr 2015 19:47:52 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL, BAYES_00, SPF_PASS autolearn=ham version=3.3.2 X-HELO: usevmg21.ericsson.net Received: from usevmg21.ericsson.net (HELO usevmg21.ericsson.net) (198.24.6.65) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-SHA encrypted) ESMTPS; Wed, 15 Apr 2015 19:47:50 +0000 Received: from EUSAAHC001.ericsson.se (Unknown_Domain [147.117.188.75]) by usevmg21.ericsson.net (Symantec Mail Security) with SMTP id 65.E5.17241.A5D5E255; Wed, 15 Apr 2015 14:45:14 +0200 (CEST) Received: from elxcz23q12-y4.mo.ca.am.ericsson.se (147.117.188.8) by smtps-am.internal.ericsson.com (147.117.188.75) with Microsoft SMTP Server (TLS) id 14.3.210.2; Wed, 15 Apr 2015 15:47:46 -0400 From: Simon Marchi To: CC: Simon Marchi Subject: [PATCH v2 1/7] Various cleanups in target read/write code Date: Wed, 15 Apr 2015 15:47:32 -0400 Message-ID: <1429127258-1033-2-git-send-email-simon.marchi@ericsson.com> In-Reply-To: <1429127258-1033-1-git-send-email-simon.marchi@ericsson.com> References: <1429127258-1033-1-git-send-email-simon.marchi@ericsson.com> MIME-Version: 1.0 X-IsSubscribed: yes This contains various cleanups in the target memory read and write code. They are not directly related to the non-8-bits changes, but they clarify things a bit down the line. gdb/ChangeLog: * target.c (target_read): Rename variables and use TARGET_XFER_E_IO. (target_read_with_progress): Same. (read_memory_robust): Constify parameters and rename variables. (read_whatever_is_readable): Constify parameters, rename variables, adjust formatting. * target.h (read_memory_robust): Constify parameters. --- gdb/target.c | 90 +++++++++++++++++++++++++++++++----------------------------- gdb/target.h | 6 ++-- 2 files changed, 49 insertions(+), 47 deletions(-) diff --git a/gdb/target.c b/gdb/target.c index 306c21d..fcf7090 100644 --- a/gdb/target.c +++ b/gdb/target.c @@ -1592,28 +1592,28 @@ target_read (struct target_ops *ops, const char *annex, gdb_byte *buf, ULONGEST offset, LONGEST len) { - LONGEST xfered = 0; + LONGEST xfered_total = 0; - while (xfered < len) + while (xfered_total < len) { - ULONGEST xfered_len; + ULONGEST xfered_partial; enum target_xfer_status status; status = target_read_partial (ops, object, annex, - (gdb_byte *) buf + xfered, - offset + xfered, len - xfered, - &xfered_len); + buf + xfered_total, + offset + xfered_total, len - xfered_total, + &xfered_partial); /* Call an observer, notifying them of the xfer progress? */ if (status == TARGET_XFER_EOF) - return xfered; + return xfered_total; else if (status == TARGET_XFER_OK) { - xfered += xfered_len; + xfered_total += xfered_partial; QUIT; } else - return -1; + return TARGET_XFER_E_IO; } return len; @@ -1642,7 +1642,7 @@ target_read (struct target_ops *ops, static void read_whatever_is_readable (struct target_ops *ops, - ULONGEST begin, ULONGEST end, + const ULONGEST begin, const ULONGEST end, VEC(memory_read_result_s) **result) { gdb_byte *buf = xmalloc (end - begin); @@ -1669,7 +1669,7 @@ read_whatever_is_readable (struct target_ops *ops, ++current_begin; } else if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, - buf + (end-begin) - 1, end - 1, 1, + buf + (end - begin) - 1, end - 1, 1, &xfered_len) == TARGET_XFER_OK) { forward = 0; @@ -1691,7 +1691,7 @@ read_whatever_is_readable (struct target_ops *ops, ULONGEST first_half_begin, first_half_end; ULONGEST second_half_begin, second_half_end; LONGEST xfer; - ULONGEST middle = current_begin + (current_end - current_begin)/2; + ULONGEST middle = current_begin + (current_end - current_begin) / 2; if (forward) { @@ -1723,7 +1723,7 @@ read_whatever_is_readable (struct target_ops *ops, else { /* This half is not readable. Because we've tried one byte, we - know some part of this half if actually redable. Go to the next + know some part of this half if actually readable. Go to the next iteration to divide again and try to read. We don't handle the other half, because this function only tries @@ -1743,10 +1743,10 @@ read_whatever_is_readable (struct target_ops *ops, else { /* The [current_end, end) range has been read. */ - LONGEST rlen = end - current_end; + LONGEST region_len = end - current_end; - r.data = xmalloc (rlen); - memcpy (r.data, buf + current_end - begin, rlen); + r.data = xmalloc (region_len); + memcpy (r.data, buf + current_end - begin, region_len); r.begin = current_end; r.end = end; xfree (buf); @@ -1769,57 +1769,59 @@ free_memory_read_result_vector (void *x) } VEC(memory_read_result_s) * -read_memory_robust (struct target_ops *ops, ULONGEST offset, LONGEST len) +read_memory_robust (struct target_ops *ops, + const ULONGEST offset, const LONGEST len) { VEC(memory_read_result_s) *result = 0; - LONGEST xfered = 0; - while (xfered < len) + LONGEST xfered_total = 0; + while (xfered_total < len) { - struct mem_region *region = lookup_mem_region (offset + xfered); - LONGEST rlen; + struct mem_region *region = lookup_mem_region (offset + xfered_total); + LONGEST region_len; /* If there is no explicit region, a fake one should be created. */ gdb_assert (region); if (region->hi == 0) - rlen = len - xfered; + region_len = len - xfered_total; else - rlen = region->hi - offset; + region_len = region->hi - offset; if (region->attrib.mode == MEM_NONE || region->attrib.mode == MEM_WO) { /* Cannot read this region. Note that we can end up here only if the region is explicitly marked inaccessible, or 'inaccessible-by-default' is in effect. */ - xfered += rlen; + xfered_total += region_len; } else { - LONGEST to_read = min (len - xfered, rlen); + LONGEST to_read = min (len - xfered_total, region_len); gdb_byte *buffer = (gdb_byte *)xmalloc (to_read); - LONGEST xfer = target_read (ops, TARGET_OBJECT_MEMORY, NULL, - (gdb_byte *) buffer, - offset + xfered, to_read); + LONGEST xfered_partial = + target_read (ops, TARGET_OBJECT_MEMORY, NULL, + (gdb_byte *) buffer, + offset + xfered_total, to_read); /* Call an observer, notifying them of the xfer progress? */ - if (xfer <= 0) + if (xfered_partial <= 0) { /* Got an error reading full chunk. See if maybe we can read some subrange. */ xfree (buffer); - read_whatever_is_readable (ops, offset + xfered, - offset + xfered + to_read, &result); - xfered += to_read; + read_whatever_is_readable (ops, offset + xfered_total, + offset + xfered_total + to_read, &result); + xfered_total += to_read; } else { struct memory_read_result r; r.data = buffer; - r.begin = offset + xfered; - r.end = r.begin + xfer; + r.begin = offset + xfered_total; + r.end = r.begin + xfered_partial; VEC_safe_push (memory_read_result_s, result, &r); - xfered += xfer; + xfered_total += xfered_partial; } QUIT; } @@ -1837,29 +1839,29 @@ target_write_with_progress (struct target_ops *ops, ULONGEST offset, LONGEST len, void (*progress) (ULONGEST, void *), void *baton) { - LONGEST xfered = 0; + LONGEST xfered_total = 0; /* Give the progress callback a chance to set up. */ if (progress) (*progress) (0, baton); - while (xfered < len) + while (xfered_total < len) { - ULONGEST xfered_len; + ULONGEST xfered_partial; enum target_xfer_status status; status = target_write_partial (ops, object, annex, - (gdb_byte *) buf + xfered, - offset + xfered, len - xfered, - &xfered_len); + (gdb_byte *) buf + xfered_total, + offset + xfered_total, len - xfered_total, + &xfered_partial); if (status != TARGET_XFER_OK) - return status == TARGET_XFER_EOF ? xfered : -1; + return status == TARGET_XFER_EOF ? xfered_total : TARGET_XFER_E_IO; if (progress) - (*progress) (xfered_len, baton); + (*progress) (xfered_partial, baton); - xfered += xfered_len; + xfered_total += xfered_partial; QUIT; } return len; diff --git a/gdb/target.h b/gdb/target.h index f57e431..ad50f07 100644 --- a/gdb/target.h +++ b/gdb/target.h @@ -291,9 +291,9 @@ DEF_VEC_O(memory_read_result_s); extern void free_memory_read_result_vector (void *); extern VEC(memory_read_result_s)* read_memory_robust (struct target_ops *ops, - ULONGEST offset, - LONGEST len); - + const ULONGEST offset, + const LONGEST len); + extern LONGEST target_write (struct target_ops *ops, enum target_object object, const char *annex, const gdb_byte *buf,