Update Xray for PNaCl

native_client_sdk/src/libraries/xray/browser.c

Index: native_client_sdk/src/libraries/xray/browser.c
diff --git a/native_client_sdk/src/libraries/xray/browser.c b/native_client_sdk/src/libraries/xray/browser.c
new file mode 100644
index 0000000000000000000000000000000000000000..ac8e04aec1abc7af77ebdf35585a12205344a595
--- /dev/null
+++ b/native_client_sdk/src/libraries/xray/browser.c
@@ -0,0 +1,133 @@
+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+/* XRay -- a simple profiler for Native Client */
+
+#ifndef XRAY_DISABLE_BROWSER_INTEGRATION
+
+#include <alloca.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "ppapi/c/dev/ppb_trace_event_dev.h"
+#include "xray/xray_priv.h"
+
+
+#if defined(XRAY)
+static PPB_Trace_Event_Dev* ppb_trace_event_interface = NULL;
+
+static const char* XRayGetName(struct XRaySymbolTable* symbols,
+      struct XRayTraceBufferEntry* e) {
+  uint32_t addr = XRAY_EXTRACT_ADDR(e->depth_addr);
+  struct XRaySymbol* symbol = XRaySymbolTableLookup(symbols, addr);
+  return XRaySymbolGetName(symbol);
+}
+
+struct XRayTimestampPair XRayGenerateTimestampsNow(void) {
+  struct XRayTimestampPair pair;
+  assert(ppb_trace_event_interface);
+
+  XRayGetTSC(&pair.xray);
+  pair.pepper = ppb_trace_event_interface->Now();
+  return pair;
+}
+
+
+void XRayBrowserTraceReport(struct XRayTraceCapture* capture) {
+
+  const void* cat_enabled = ppb_trace_event_interface->GetCategoryEnabled(
+      "xray");
+  struct XRaySymbolTable* symbols = XRayGetSymbolTable(capture);
+
+  int32_t thread_id = XRayGetSavedThreadID(capture);
+
+  int head = XRayFrameGetHead(capture);
+  int frame = XRayFrameGetTail(capture);
+  while(frame != head) {
+
+    struct XRayTimestampPair* start_time = XRayGetTimestamp(
+        capture, frame, false);
+    struct XRayTimestampPair* end_time = XRayGetTimestamp(
+        capture, frame, true);

[nfullagar1, 2013/07/18 18:21:06]

See comment in xray.c about XRayGetTimestamp(...)

[grosse, 2013/07/18 20:45:37]

Done.

+
+    double pdiff = (end_time->pepper - start_time->pepper);
+    double odiff = (end_time->xray - start_time->xray);
+    double scale_a = pdiff / odiff;
+    double scale_b = ((double)end_time->pepper) - (scale_a * end_time->xray);
+    printf("Xray timestamp calibration frame %d: %f %f\n",
+        frame, scale_a, scale_b);
+
+
+    int start = XRayFrameGetTraceStartIndex(capture, frame);
+    int end = XRayFrameGetTraceEndIndex(capture, frame);
+    int count = XRayFrameGetTraceCount(capture, frame);
+
+    struct XRayTraceBufferEntry** stack_base = XRayMalloc(
+      sizeof(struct XRayTraceBufferEntry*) * (count+1));

[nfullagar1, 2013/07/18 18:21:06]

see earlier comment (if new snapshots are uploaded, it is easy to miss earlier
comments from previous snap.  Alternatively, read through the comments sent via
email to catch all comments across multiple snapshots)

[grosse, 2013/07/18 20:45:37]

Done.

+    struct XRayTraceBufferEntry** stack_top = stack_base;
+    *stack_top = NULL;
+
+    int i;
+    for(i = start; i != end; i = XRayTraceNextEntry(capture, i)) {

[nfullagar1, 2013/07/18 18:21:06]

see earlier comment

[grosse, 2013/07/18 20:45:37]

The separate int i; is required for it to compile. Presumably the build scripts
aren't defining -std=c99 for some reason.

+      if (XRayTraceIsAnnotation(capture, i)) {
+        continue;
+      }
+
+      uint64_t current_tick = XRayTraceGetEntry(capture, i)->start_tick;
+      while(*stack_top && current_tick >= (*stack_top)->end_tick) {
+        struct XRayTraceBufferEntry* e = *(stack_top--);
+        ppb_trace_event_interface->AddTraceEventWithThreadIdAndTimestamp(
+            'E', cat_enabled,
+            XRayGetName(symbols, e),
+            0, thread_id,
+            (scale_a * e->end_tick) + scale_b,
+            0, NULL, NULL, NULL, 0
+        );
+      }
+
+      {

[nfullagar1, 2013/07/18 18:21:06]

see earlier comment

[grosse, 2013/07/18 20:45:37]

Done.

+        struct XRayTraceBufferEntry* e = XRayTraceGetEntry(capture, i);
+        ppb_trace_event_interface->AddTraceEventWithThreadIdAndTimestamp(
+            'B', cat_enabled,
+            XRayGetName(symbols, e),
+            0, thread_id,
+            (scale_a * e->start_tick) + scale_b,
+            0, NULL, NULL, NULL, 0
+        );
+
+        *(++stack_top) = e;
+      }
+    }
+
+    while(*stack_top) {
+      struct XRayTraceBufferEntry* e = *(stack_top--);
+      ppb_trace_event_interface->AddTraceEventWithThreadIdAndTimestamp(
+          'E', cat_enabled,
+          XRayGetName(symbols, e),
+          0, thread_id,
+          (scale_a * e->end_tick) + scale_b,
+          0, NULL, NULL, NULL, 0
+      );
+    }
+
+    frame = XRayFrameGetNext(capture, frame);
+    XRayFree(stack_base);
+  }
+}
+
+void XRayRegisterBrowserInterface(PPB_GetInterface interface) {
+  ppb_trace_event_interface = (PPB_Trace_Event_Dev*)interface(
+      PPB_TRACE_EVENT_DEV_INTERFACE);
+  assert(ppb_trace_event_interface);
+}
+
+#endif  /* XRAY */
+#endif  /* XRAY_DISABLE_BROWSER_INTEGRATION */