conf: rewrite filtering for capabilities lookup

The virCapabilitiesDomainDataLookupInternal() is given a list of
parameters representing the desired domain characteristics. It then has
to look throught the capabilities to identify an acceptable match.

The virCapsDomainDataCompare() method is used for filtering out
candidates which don't match the desired criteria. It is called
primarily from the innermost loops and as such is doing many repeated
checks. For example if architcture and os type were checked at the top
level loop the two inner loops could be avoided entirely. If emulator
and domain type were checked in the 2nd level loop the 3rd level loop
can be avoided too.

This change thus removes the virCapsDomainDataCompare() method and puts
suitable checks at the start of each loop to ensure it executes the
minimal number of loop iterations possible. The code becomes clearer to
understand as a nice side-effect.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/conf/capabilities.c

@@ -604,46 +604,6 @@ virCapabilitiesHostSecModelAddBaseLabel(virCapsHostSecModelPtr secmodel,
     return -1;
 }
 
-static bool
-virCapsDomainDataCompare(virCapsGuestPtr guest,
-                         virCapsGuestDomainPtr domain,
-                         virCapsGuestMachinePtr machine,
-                         int ostype,
-                         virArch arch,
-                         virDomainVirtType domaintype,
-                         const char *emulator,
-                         const char *machinetype)
-{
-    const char *check_emulator = NULL;
-
-    if (ostype != -1 && guest->ostype != ostype)
-        return false;
-    if ((arch != VIR_ARCH_NONE) && (guest->arch.id != arch))
-        return false;
-
-    if (domaintype != VIR_DOMAIN_VIRT_NONE &&
-        (!domain || domain->type != domaintype))
-        return false;
-
-    if (emulator) {
-        if (domain)
-            check_emulator = domain->info.emulator;
-        if (!check_emulator)
-            check_emulator = guest->arch.defaultInfo.emulator;
-        if (STRNEQ_NULLABLE(check_emulator, emulator))
-            return false;
-    }
-
-    if (machinetype) {
-        if (!machine)
-            return false;
-        if (STRNEQ(machine->name, machinetype) &&
-            (STRNEQ_NULLABLE(machine->canonical, machinetype)))
-            return false;
-    }
-
-    return true;
-}
 
 static virCapsDomainDataPtr
 virCapabilitiesDomainDataLookupInternal(virCapsPtr caps,
@@ -659,13 +619,45 @@ virCapabilitiesDomainDataLookupInternal(virCapsPtr caps,
     virCapsDomainDataPtr ret = NULL;
     size_t i, j, k;
 
+    VIR_DEBUG("Lookup ostype=%d arch=%d domaintype=%d emulator=%s machine=%s",
+              ostype, arch, domaintype, NULLSTR(emulator), NULLSTR(machinetype));
     for (i = 0; i < caps->nguests; i++) {
         virCapsGuestPtr guest = caps->guests[i];
 
+        if (ostype != -1 && guest->ostype != ostype) {
+            VIR_DEBUG("Skip os type want=%d vs got=%d", ostype, guest->ostype);
+            continue;
+        }
+        VIR_DEBUG("Match os type %d", ostype);
+
+        if ((arch != VIR_ARCH_NONE) && (guest->arch.id != arch)) {
+            VIR_DEBUG("Skip arch want=%d vs got=%d", arch, guest->arch.id);
+            continue;
+        }
+        VIR_DEBUG("Match arch %d", arch);
+
         for (j = 0; j < guest->arch.ndomains; j++) {
             virCapsGuestDomainPtr domain = guest->arch.domains[j];
             virCapsGuestMachinePtr *machinelist;
             int nmachines;
+            const char *check_emulator = NULL;
+
+            if (domaintype != VIR_DOMAIN_VIRT_NONE &&
+                (domain->type != domaintype)) {
+                VIR_DEBUG("Skip domain type want=%d vs got=%d", domaintype, domain->type);
+                continue;
+            }
+            VIR_DEBUG("Match domain type %d", domaintype);
+
+            check_emulator = domain->info.emulator;
+            if (!check_emulator)
+                check_emulator = guest->arch.defaultInfo.emulator;
+            if (emulator && STRNEQ_NULLABLE(check_emulator, emulator)) {
+                VIR_DEBUG("Skip emulator got=%s vs want=%s",
+                          emulator, NULLSTR(check_emulator));
+                continue;
+            }
+            VIR_DEBUG("Match emulator %s", NULLSTR(emulator));
 
             if (domain->info.nmachines) {
                 nmachines = domain->info.nmachines;
@@ -677,32 +669,29 @@ virCapabilitiesDomainDataLookupInternal(virCapsPtr caps,
 
             for (k = 0; k < nmachines; k++) {
                 virCapsGuestMachinePtr machine = machinelist[k];
-                if (!virCapsDomainDataCompare(guest, domain, machine,
-                                              ostype, arch, domaintype,
-                                              emulator, machinetype))
+
+                if (machinetype &&
+                    STRNEQ(machine->name, machinetype) &&
+                    STRNEQ_NULLABLE(machine->canonical, machinetype)) {
+                    VIR_DEBUG("Skip machine type want=%s vs got=%s got=%s",
+                              machinetype, machine->name, NULLSTR(machine->canonical));
                     continue;
+                }
+                VIR_DEBUG("Match machine type machine %s\n", NULLSTR(machinetype));
 
                 foundmachine = machine;
                 break;
             }
 
-            if (!foundmachine) {
-                if (!virCapsDomainDataCompare(guest, domain, NULL,
-                                              ostype, arch, domaintype,
-                                              emulator, machinetype))
+            if (!foundmachine && nmachines)
                 continue;
-            }
 
             founddomain = domain;
             break;
         }
 
-        if (!founddomain) {
-            if (!virCapsDomainDataCompare(guest, NULL, NULL,
-                                          ostype, arch, domaintype,
-                                          emulator, machinetype))
+        if (!founddomain)
             continue;
-        }
 
         foundguest = guest;
         break;