1 files changed, 132 insertions, 0 deletions
diff --git a/debug.c b/debug.c
new file mode 100644
index 0000000..7290555
--- /dev/null
+++ b/debug.c
@@ -0,0 +1,132 @@
+/*
+    Copyright Rene Rivera 2005.
+    Distributed under the Boost Software License, Version 1.0.
+    (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#include "jam.h"
+
+#include "hash.h"
+
+#include <time.h>
+#include <assert.h>
+
+
+static profile_frame * profile_stack = 0;
+static struct hash   * profile_hash  = 0;
+static profile_info    profile_other = { "[OTHER]", 0, 0, 0, 0, 0 };
+static profile_info    profile_total = { "[TOTAL]", 0, 0, 0, 0, 0 };
+
+
+profile_frame * profile_init( char * rulename, profile_frame * frame )
+{
+    if ( DEBUG_PROFILE ) profile_enter( rulename, frame );
+    return frame;
+}
+
+
+void profile_enter( char * rulename, profile_frame * frame )
+{
+    if ( DEBUG_PROFILE )
+    {
+        clock_t start = clock();
+        profile_info info;
+        profile_info * p = &info;
+
+        if ( !rulename ) p = &profile_other;
+
+        if ( !profile_hash && rulename )
+            profile_hash = hashinit( sizeof( profile_info ), "profile" );
+
+        info.name = rulename;
+
+        if ( rulename && hashenter( profile_hash, (HASHDATA * *)&p ) )
+            p->cumulative = p->net = p->num_entries = p->stack_count = p->memory = 0;
+
+        ++p->num_entries;
+        ++p->stack_count;
+
+        frame->info = p;
+
+        frame->caller = profile_stack;
+        profile_stack = frame;
+
+        frame->entry_time = clock();
+        frame->overhead = 0;
+        frame->subrules = 0;
+
+        /* caller pays for the time it takes to play with the hash table */
+        if ( frame->caller )
+            frame->caller->overhead += frame->entry_time - start;
+    }
+}
+
+
+void profile_memory( long mem )
+{
+    if ( DEBUG_PROFILE )
+        if ( profile_stack && profile_stack->info )
+            profile_stack->info->memory += mem;
+}
+
+
+void profile_exit( profile_frame * frame )
+{
+    if ( DEBUG_PROFILE )
+    {
+        /* Cumulative time for this call. */
+        clock_t t = clock() - frame->entry_time - frame->overhead;
+        /* If this rule is already present on the stack, don't add the time for
+         * this instance.
+         */
+        if ( frame->info->stack_count == 1 )
+            frame->info->cumulative += t;
+        /* Net time does not depend on presense of the same rule in call stack.
+         */
+        frame->info->net += t - frame->subrules;
+
+        if ( frame->caller )
+        {
+            /* Caller's cumulative time must account for this overhead. */
+            frame->caller->overhead += frame->overhead;
+            frame->caller->subrules += t;
+        }
+        /* Pop this stack frame. */
+        --frame->info->stack_count;
+        profile_stack = frame->caller;
+    }
+}
+
+
+static void dump_profile_entry( void * p_, void * ignored )
+{
+    profile_info * p = (profile_info *)p_;
+    unsigned long mem_each = ( p->memory / ( p->num_entries ? p->num_entries : 1 ) );
+    double cumulative = p->cumulative;
+    double net = p->net;
+    double q = p->net;
+    q /= ( p->num_entries ? p->num_entries : 1 );
+    cumulative /= CLOCKS_PER_SEC;
+    net /= CLOCKS_PER_SEC;
+    q /= CLOCKS_PER_SEC;
+    if ( !ignored )
+    {
+        profile_total.cumulative += p->net;
+        profile_total.memory += p->memory;
+    }
+    printf( "%10ld %12.6f %12.6f %12.8f %10ld %10ld %s\n", p->num_entries,
+        cumulative, net, q, p->memory, mem_each, p->name );
+}
+
+
+void profile_dump()
+{
+    if ( profile_hash )
+    {
+        printf( "%10s %12s %12s %12s %10s %10s %s\n", "--count--", "--gross--",
+            "--net--", "--each--", "--mem--", "--each--", "--name--" );
+        hashenumerate( profile_hash, dump_profile_entry, 0 );
+        dump_profile_entry( &profile_other, 0 );
+        dump_profile_entry( &profile_total, (void *)1 );
+    }
+}