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Posted to commits@nifi.apache.org by ph...@apache.org on 2017/12/13 20:41:12 UTC

[05/51] [partial] nifi-minifi-cpp git commit: MINIFICPP-303 Update to civet 1.10

http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/df353561/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug.h
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diff --git a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug.h b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug.h
new file mode 100644
index 0000000..256d2dc
--- /dev/null
+++ b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug.h
@@ -0,0 +1,185 @@
+/*
+ *  Debugging macros, DUK_DPRINT() and its variants in particular.
+ *
+ *  DUK_DPRINT() allows formatted debug prints, and supports standard
+ *  and Duktape specific formatters.  See duk_debug_vsnprintf.c for details.
+ *
+ *  DUK_D(x), DUK_DD(x), and DUK_DDD(x) are used together with log macros
+ *  for technical reasons.  They are concretely used to hide 'x' from the
+ *  compiler when the corresponding log level is disabled.  This allows
+ *  clean builds on non-C99 compilers, at the cost of more verbose code.
+ *  Examples:
+ *
+ *    DUK_D(DUK_DPRINT("foo"));
+ *    DUK_DD(DUK_DDPRINT("foo"));
+ *    DUK_DDD(DUK_DDDPRINT("foo"));
+ *
+ *  This approach is preferable to the old "double parentheses" hack because
+ *  double parentheses make the C99 solution worse: __FILE__ and __LINE__ can
+ *  no longer be added transparently without going through globals, which
+ *  works poorly with threading.
+ */
+
+#ifndef DUK_DEBUG_H_INCLUDED
+#define DUK_DEBUG_H_INCLUDED
+
+#ifdef DUK_USE_DEBUG
+
+#if defined(DUK_USE_DPRINT)
+#define DUK_D(x) x
+#else
+#define DUK_D(x) do { } while (0) /* omit */
+#endif
+
+#if defined(DUK_USE_DDPRINT)
+#define DUK_DD(x) x
+#else
+#define DUK_DD(x) do { } while (0) /* omit */
+#endif
+
+#if defined(DUK_USE_DDDPRINT)
+#define DUK_DDD(x) x
+#else
+#define DUK_DDD(x) do { } while (0) /* omit */
+#endif
+
+/*
+ *  Exposed debug macros: debugging enabled
+ */
+
+#define DUK_LEVEL_DEBUG    1
+#define DUK_LEVEL_DDEBUG   2
+#define DUK_LEVEL_DDDEBUG  3
+
+#ifdef DUK_USE_VARIADIC_MACROS
+
+/* Note: combining __FILE__, __LINE__, and __func__ into fmt would be
+ * possible compile time, but waste some space with shared function names.
+ */
+#define DUK__DEBUG_LOG(lev,...)  duk_debug_log((duk_small_int_t) (lev), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, DUK_FUNC_MACRO, __VA_ARGS__);
+
+#define DUK_DPRINT(...)          DUK__DEBUG_LOG(DUK_LEVEL_DEBUG, __VA_ARGS__)
+
+#ifdef DUK_USE_DDPRINT
+#define DUK_DDPRINT(...)         DUK__DEBUG_LOG(DUK_LEVEL_DDEBUG, __VA_ARGS__)
+#else
+#define DUK_DDPRINT(...)
+#endif
+
+#ifdef DUK_USE_DDDPRINT
+#define DUK_DDDPRINT(...)        DUK__DEBUG_LOG(DUK_LEVEL_DDDEBUG, __VA_ARGS__)
+#else
+#define DUK_DDDPRINT(...)
+#endif
+
+#else  /* DUK_USE_VARIADIC_MACROS */
+
+#define DUK__DEBUG_STASH(lev)    \
+	(void) DUK_SNPRINTF(duk_debug_file_stash, DUK_DEBUG_STASH_SIZE, "%s", (const char *) DUK_FILE_MACRO), \
+	duk_debug_file_stash[DUK_DEBUG_STASH_SIZE - 1] = (char) 0; \
+	(void) DUK_SNPRINTF(duk_debug_line_stash, DUK_DEBUG_STASH_SIZE, "%ld", (long) DUK_LINE_MACRO), \
+	duk_debug_line_stash[DUK_DEBUG_STASH_SIZE - 1] = (char) 0; \
+	(void) DUK_SNPRINTF(duk_debug_func_stash, DUK_DEBUG_STASH_SIZE, "%s", (const char *) DUK_FUNC_MACRO), \
+	duk_debug_func_stash[DUK_DEBUG_STASH_SIZE - 1] = (char) 0; \
+	(void) (duk_debug_level_stash = (lev))
+
+/* Without variadic macros resort to comma expression trickery to handle debug
+ * prints.  This generates a lot of harmless warnings.  These hacks are not
+ * needed normally because DUK_D() and friends will hide the entire debug log
+ * statement from the compiler.
+ */
+
+#ifdef DUK_USE_DPRINT
+#define DUK_DPRINT  DUK__DEBUG_STASH(DUK_LEVEL_DEBUG), (void) duk_debug_log  /* args go here in parens */
+#else
+#define DUK_DPRINT  0 && /* args go here as a comma expression in parens */
+#endif
+
+#ifdef DUK_USE_DDPRINT
+#define DUK_DDPRINT  DUK__DEBUG_STASH(DUK_LEVEL_DDEBUG), (void) duk_debug_log  /* args go here in parens */
+#else
+#define DUK_DDPRINT  0 && /* args */
+#endif
+
+#ifdef DUK_USE_DDDPRINT
+#define DUK_DDDPRINT  DUK__DEBUG_STASH(DUK_LEVEL_DDDEBUG), (void) duk_debug_log  /* args go here in parens */
+#else
+#define DUK_DDDPRINT  0 && /* args */
+#endif
+
+#endif  /* DUK_USE_VARIADIC_MACROS */
+
+#else  /* DUK_USE_DEBUG */
+
+/*
+ *  Exposed debug macros: debugging disabled
+ */
+
+#define DUK_D(x) do { } while (0) /* omit */
+#define DUK_DD(x) do { } while (0) /* omit */
+#define DUK_DDD(x) do { } while (0) /* omit */
+
+#ifdef DUK_USE_VARIADIC_MACROS
+
+#define DUK_DPRINT(...)
+#define DUK_DDPRINT(...)
+#define DUK_DDDPRINT(...)
+
+#else  /* DUK_USE_VARIADIC_MACROS */
+
+#define DUK_DPRINT    0 && /* args go here as a comma expression in parens */
+#define DUK_DDPRINT   0 && /* args */
+#define DUK_DDDPRINT  0 && /* args */
+
+#endif  /* DUK_USE_VARIADIC_MACROS */
+
+#endif  /* DUK_USE_DEBUG */
+
+/*
+ *  Structs
+ */
+
+#ifdef DUK_USE_DEBUG
+struct duk_fixedbuffer {
+	duk_uint8_t *buffer;
+	duk_size_t length;
+	duk_size_t offset;
+	duk_bool_t truncated;
+};
+#endif
+
+/*
+ *  Prototypes
+ */
+
+#ifdef DUK_USE_DEBUG
+DUK_INTERNAL_DECL duk_int_t duk_debug_vsnprintf(char *str, duk_size_t size, const char *format, va_list ap);
+#if 0  /*unused*/
+DUK_INTERNAL_DECL duk_int_t duk_debug_snprintf(char *str, duk_size_t size, const char *format, ...);
+#endif
+DUK_INTERNAL_DECL void duk_debug_format_funcptr(char *buf, duk_size_t buf_size, duk_uint8_t *fptr, duk_size_t fptr_size);
+
+#ifdef DUK_USE_VARIADIC_MACROS
+DUK_INTERNAL_DECL void duk_debug_log(duk_small_int_t level, const char *file, duk_int_t line, const char *func, const char *fmt, ...);
+#else  /* DUK_USE_VARIADIC_MACROS */
+/* parameter passing, not thread safe */
+#define DUK_DEBUG_STASH_SIZE  128
+#if !defined(DUK_SINGLE_FILE)
+DUK_INTERNAL_DECL char duk_debug_file_stash[DUK_DEBUG_STASH_SIZE];
+DUK_INTERNAL_DECL char duk_debug_line_stash[DUK_DEBUG_STASH_SIZE];
+DUK_INTERNAL_DECL char duk_debug_func_stash[DUK_DEBUG_STASH_SIZE];
+DUK_INTERNAL_DECL duk_small_int_t duk_debug_level_stash;
+#endif
+DUK_INTERNAL_DECL void duk_debug_log(const char *fmt, ...);
+#endif  /* DUK_USE_VARIADIC_MACROS */
+
+DUK_INTERNAL_DECL void duk_fb_put_bytes(duk_fixedbuffer *fb, const duk_uint8_t *buffer, duk_size_t length);
+DUK_INTERNAL_DECL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x);
+DUK_INTERNAL_DECL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x);
+DUK_INTERNAL_DECL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...);
+DUK_INTERNAL_DECL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size);
+DUK_INTERNAL_DECL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb);
+
+#endif  /* DUK_USE_DEBUG */
+
+#endif  /* DUK_DEBUG_H_INCLUDED */

http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/df353561/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_fixedbuffer.c
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diff --git a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_fixedbuffer.c b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_fixedbuffer.c
new file mode 100644
index 0000000..b8538af
--- /dev/null
+++ b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_fixedbuffer.c
@@ -0,0 +1,69 @@
+/*
+ *  Fixed buffer helper useful for debugging, requires no allocation
+ *  which is critical for debugging.
+ */
+
+#include "duk_internal.h"
+
+#ifdef DUK_USE_DEBUG
+
+DUK_INTERNAL void duk_fb_put_bytes(duk_fixedbuffer *fb, const duk_uint8_t *buffer, duk_size_t length) {
+	duk_size_t avail;
+	duk_size_t copylen;
+
+	avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
+	if (length > avail) {
+		copylen = avail;
+		fb->truncated = 1;
+	} else {
+		copylen = length;
+	}
+	DUK_MEMCPY(fb->buffer + fb->offset, buffer, copylen);
+	fb->offset += copylen;
+}
+
+DUK_INTERNAL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x) {
+	duk_fb_put_bytes(fb, (const duk_uint8_t *) &x, 1);
+}
+
+DUK_INTERNAL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x) {
+	duk_fb_put_bytes(fb, (const duk_uint8_t *) x, (duk_size_t) DUK_STRLEN(x));
+}
+
+DUK_INTERNAL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...) {
+	duk_size_t avail;
+	va_list ap;
+
+	va_start(ap, fmt);
+	avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
+	if (avail > 0) {
+		duk_int_t res = (duk_int_t) DUK_VSNPRINTF((char *) (fb->buffer + fb->offset), avail, fmt, ap);
+		if (res < 0) {
+			/* error */
+		} else if ((duk_size_t) res >= avail) {
+			/* (maybe) truncated */
+			fb->offset += avail;
+			if ((duk_size_t) res > avail) {
+				/* actual chars dropped (not just NUL term) */
+				fb->truncated = 1;
+			}
+		} else {
+			/* normal */
+			fb->offset += res;
+		}
+	}
+	va_end(ap);
+}
+
+DUK_INTERNAL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size) {
+	char buf[64+1];
+	duk_debug_format_funcptr(buf, sizeof(buf), fptr, fptr_size);
+	buf[sizeof(buf) - 1] = (char) 0;
+	duk_fb_put_cstring(fb, buf);
+}
+
+DUK_INTERNAL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb) {
+	return (fb->offset >= fb->length);
+}
+
+#endif  /* DUK_USE_DEBUG */

http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/df353561/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_heap.c
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diff --git a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_heap.c b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_heap.c
new file mode 100644
index 0000000..134e634
--- /dev/null
+++ b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_heap.c
@@ -0,0 +1,247 @@
+/*
+ *  Debug dumping of duk_heap.
+ */
+
+#include "duk_internal.h"
+
+#ifdef DUK_USE_DEBUG
+
+#if 0  /*unused*/
+DUK_LOCAL void duk__sanitize_snippet(char *buf, duk_size_t buf_size, duk_hstring *str) {
+	duk_size_t i;
+	duk_size_t nchars;
+	duk_size_t maxchars;
+	duk_uint8_t *data;
+
+	DUK_MEMZERO(buf, buf_size);
+
+	maxchars = (duk_size_t) (buf_size - 1);
+	data = DUK_HSTRING_GET_DATA(str);
+	nchars = ((duk_size_t) str->blen < maxchars ? (duk_size_t) str->blen : maxchars);
+	for (i = 0; i < nchars; i++) {
+		duk_small_int_t c = (duk_small_int_t) data[i];
+		if (c < 0x20 || c > 0x7e) {
+			c = '.';
+		}
+		buf[i] = (char) c;
+	}
+}
+#endif
+
+#if 0
+DUK_LOCAL const char *duk__get_heap_type_string(duk_heaphdr *hdr) {
+	switch (DUK_HEAPHDR_GET_TYPE(hdr)) {
+	case DUK_HTYPE_STRING:
+		return "string";
+	case DUK_HTYPE_OBJECT:
+		return "object";
+	case DUK_HTYPE_BUFFER:
+		return "buffer";
+	default:
+		return "???";
+	}
+}
+#endif
+
+#if 0
+DUK_LOCAL void duk__dump_indented(duk_heaphdr *obj, int index) {
+	DUK_UNREF(obj);
+	DUK_UNREF(index);
+	DUK_UNREF(duk__get_heap_type_string);
+
+#ifdef DUK_USE_REFERENCE_COUNTING
+	DUK_D(DUK_DPRINT("  [%ld]: %p %s (flags: 0x%08lx, ref: %ld) -> %!O",
+	                 (long) index,
+	                 (void *) obj,
+	                 (const char *) duk__get_heap_type_string(obj),
+	                 (unsigned long) DUK_HEAPHDR_GET_FLAGS(obj),
+	                 (long) DUK_HEAPHDR_GET_REFCOUNT(obj),
+	                 (duk_heaphdr *) obj));
+#else
+	DUK_D(DUK_DPRINT("  [%ld]: %p %s (flags: 0x%08lx) -> %!O",
+	                 (long) index,
+	                 (void *) obj,
+	                 (const char *) duk__get_heap_type_string(obj),
+	                 (unsigned long) DUK_HEAPHDR_GET_FLAGS(obj),
+	                 (duk_heaphdr *) obj));
+#endif
+}
+#endif
+
+#if 0  /*unused*/
+DUK_LOCAL void duk__dump_heaphdr_list(duk_heap *heap, duk_heaphdr *root, const char *name) {
+	duk_int_t count;
+	duk_heaphdr *curr;
+
+	DUK_UNREF(heap);
+	DUK_UNREF(name);
+
+	count = 0;
+	curr = root;
+	while (curr) {
+		count++;
+		curr = DUK_HEAPHDR_GET_NEXT(curr);
+	}
+
+	DUK_D(DUK_DPRINT("%s, %ld objects", (const char *) name, (long) count));
+
+	count = 0;
+	curr = root;
+	while (curr) {
+		count++;
+		duk__dump_indented(curr, count);
+		curr = DUK_HEAPHDR_GET_NEXT(curr);
+	}
+}
+#endif
+
+#if 0  /*unused*/
+DUK_LOCAL void duk__dump_stringtable(duk_heap *heap) {
+	duk_uint_fast32_t i;
+	char buf[64+1];
+
+	DUK_D(DUK_DPRINT("stringtable %p, used %ld, size %ld, load %ld%%",
+	                 (void *) heap->strtable,
+	                 (long) heap->st_used,
+	                 (long) heap->st_size,
+	                 (long) (((double) heap->st_used) / ((double) heap->st_size) * 100.0)));
+
+	for (i = 0; i < (duk_uint_fast32_t) heap->st_size; i++) {
+		duk_hstring *e = heap->strtable[i];
+
+		if (!e) {
+			DUK_D(DUK_DPRINT("  [%ld]: NULL", (long) i));
+		} else if (e == DUK_STRTAB_DELETED_MARKER(heap)) {
+			DUK_D(DUK_DPRINT("  [%ld]: DELETED", (long) i));
+		} else {
+			duk__sanitize_snippet(buf, sizeof(buf), e);
+
+#ifdef DUK_USE_REFERENCE_COUNTING
+			DUK_D(DUK_DPRINT("  [%ld]: %p (flags: 0x%08lx, ref: %ld) '%s', strhash=0x%08lx, blen=%ld, clen=%ld, "
+			                 "arridx=%ld, internal=%ld, reserved_word=%ld, strict_reserved_word=%ld, eval_or_arguments=%ld",
+			                 (long) i,
+			                 (void *) e,
+			                 (unsigned long) DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) e),
+			                 (long) DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) e),
+			                 (const char *) buf,
+			                 (unsigned long) e->hash,
+			                 (long) e->blen,
+			                 (long) e->clen,
+			                 (long) (DUK_HSTRING_HAS_ARRIDX(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_INTERNAL(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_RESERVED_WORD(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_STRICT_RESERVED_WORD(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_EVAL_OR_ARGUMENTS(e) ? 1 : 0)));
+#else
+			DUK_D(DUK_DPRINT("  [%ld]: %p (flags: 0x%08lx) '%s', strhash=0x%08lx, blen=%ld, clen=%ld, "
+			                 "arridx=%ld, internal=%ld, reserved_word=%ld, strict_reserved_word=%ld, eval_or_arguments=%ld",
+			                 (long) i,
+			                 (void *) e,
+			                 (unsigned long) DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) e),
+			                 (const char *) buf,
+			                 (long) e->hash,
+			                 (long) e->blen,
+			                 (long) e->clen,
+			                 (long) (DUK_HSTRING_HAS_ARRIDX(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_INTERNAL(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_RESERVED_WORD(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_STRICT_RESERVED_WORD(e) ? 1 : 0),
+			                 (long) (DUK_HSTRING_HAS_EVAL_OR_ARGUMENTS(e) ? 1 : 0)));
+#endif
+		}
+	}
+}
+#endif
+
+#if 0  /*unused*/
+DUK_LOCAL void duk__dump_strcache(duk_heap *heap) {
+	duk_uint_fast32_t i;
+	char buf[64+1];
+
+	DUK_D(DUK_DPRINT("stringcache"));
+
+	for (i = 0; i < (duk_uint_fast32_t) DUK_HEAP_STRCACHE_SIZE; i++) {
+		duk_strcache *c = &heap->strcache[i];
+		if (!c->h) {
+			DUK_D(DUK_DPRINT("  [%ld]: bidx=%ld, cidx=%ld, str=NULL",
+			                 (long) i, (long) c->bidx, (long) c->cidx));
+		} else {
+			duk__sanitize_snippet(buf, sizeof(buf), c->h);
+			DUK_D(DUK_DPRINT("  [%ld]: bidx=%ld cidx=%ld str=%s",
+			                 (long) i, (long) c->bidx, (long) c->cidx, (const char *) buf));
+		}
+	}
+}
+#endif
+
+#if 0  /*unused*/
+DUK_INTERNAL void duk_debug_dump_heap(duk_heap *heap) {
+	char buf[64+1];
+
+	DUK_D(DUK_DPRINT("=== heap %p ===", (void *) heap));
+	DUK_D(DUK_DPRINT("  flags: 0x%08lx", (unsigned long) heap->flags));
+
+	/* Note: there is no standard formatter for function pointers */
+#ifdef DUK_USE_GCC_PRAGMAS
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-pedantic"
+#endif
+	duk_debug_format_funcptr(buf, sizeof(buf), (duk_uint8_t *) &heap->alloc_func, sizeof(heap->alloc_func));
+	DUK_D(DUK_DPRINT("  alloc_func: %s", (const char *) buf));
+	duk_debug_format_funcptr(buf, sizeof(buf), (duk_uint8_t *) &heap->realloc_func, sizeof(heap->realloc_func));
+	DUK_D(DUK_DPRINT("  realloc_func: %s", (const char *) buf));
+	duk_debug_format_funcptr(buf, sizeof(buf), (duk_uint8_t *) &heap->free_func, sizeof(heap->free_func));
+	DUK_D(DUK_DPRINT("  free_func: %s", (const char *) buf));
+	duk_debug_format_funcptr(buf, sizeof(buf), (duk_uint8_t *) &heap->fatal_func, sizeof(heap->fatal_func));
+	DUK_D(DUK_DPRINT("  fatal_func: %s", (const char *) buf));
+#ifdef DUK_USE_GCC_PRAGMAS
+#pragma GCC diagnostic pop
+#endif
+
+	DUK_D(DUK_DPRINT("  heap_udata: %p", (void *) heap->heap_udata));
+
+#ifdef DUK_USE_MARK_AND_SWEEP
+#ifdef DUK_USE_VOLUNTARY_GC
+	DUK_D(DUK_DPRINT("  mark-and-sweep trig counter: %ld", (long) heap->mark_and_sweep_trigger_counter));
+#endif
+	DUK_D(DUK_DPRINT("  mark-and-sweep rec depth: %ld", (long) heap->mark_and_sweep_recursion_depth));
+	DUK_D(DUK_DPRINT("  mark-and-sweep base flags: 0x%08lx", (unsigned long) heap->mark_and_sweep_base_flags));
+#endif
+
+	DUK_D(DUK_DPRINT("  lj.jmpbuf_ptr: %p", (void *) heap->lj.jmpbuf_ptr));
+	DUK_D(DUK_DPRINT("  lj.type: %ld", (long) heap->lj.type));
+	DUK_D(DUK_DPRINT("  lj.value1: %!T", (duk_tval *) &heap->lj.value1));
+	DUK_D(DUK_DPRINT("  lj.value2: %!T", (duk_tval *) &heap->lj.value2));
+	DUK_D(DUK_DPRINT("  lj.iserror: %ld", (long) heap->lj.iserror));
+
+	DUK_D(DUK_DPRINT("  handling_error: %ld", (long) heap->handling_error));
+
+	DUK_D(DUK_DPRINT("  heap_thread: %!@O", (duk_heaphdr *) heap->heap_thread));
+	DUK_D(DUK_DPRINT("  curr_thread: %!@O", (duk_heaphdr *) heap->curr_thread));
+	DUK_D(DUK_DPRINT("  heap_object: %!@O", (duk_heaphdr *) heap->heap_object));
+
+	DUK_D(DUK_DPRINT("  call_recursion_depth: %ld", (long) heap->call_recursion_depth));
+	DUK_D(DUK_DPRINT("  call_recursion_limit: %ld", (long) heap->call_recursion_limit));
+
+	DUK_D(DUK_DPRINT("  hash_seed: 0x%08lx", (unsigned long) heap->hash_seed));
+	DUK_D(DUK_DPRINT("  rnd_state: 0x%08lx", (unsigned long) heap->rnd_state));
+
+	duk__dump_strcache(heap);
+
+	duk__dump_heaphdr_list(heap, heap->heap_allocated, "heap allocated");
+
+#ifdef DUK_USE_REFERENCE_COUNTING
+	duk__dump_heaphdr_list(heap, heap->refzero_list, "refcounting refzero list");
+#endif
+
+#ifdef DUK_USE_MARK_AND_SWEEP
+	duk__dump_heaphdr_list(heap, heap->finalize_list, "mark-and-sweep finalize list");
+#endif
+
+	duk__dump_stringtable(heap);
+
+	/* heap->strs: not worth dumping */
+}
+#endif
+
+#endif  /* DUK_USE_DEBUG */

http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/df353561/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_macros.c
----------------------------------------------------------------------
diff --git a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_macros.c b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_macros.c
new file mode 100644
index 0000000..582a981
--- /dev/null
+++ b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_macros.c
@@ -0,0 +1,144 @@
+/*
+ *  Debugging macro calls.
+ */
+
+#include "duk_internal.h"
+
+#ifdef DUK_USE_DEBUG
+
+/*
+ *  Debugging enabled
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#define DUK__DEBUG_BUFSIZE  DUK_USE_DEBUG_BUFSIZE
+DUK_LOCAL char duk__debug_buf[DUK__DEBUG_BUFSIZE];
+
+DUK_LOCAL const char *duk__get_level_string(duk_small_int_t level) {
+	switch ((int) level) {
+	case DUK_LEVEL_DEBUG:
+		return "D";
+	case DUK_LEVEL_DDEBUG:
+		return "DD";
+	case DUK_LEVEL_DDDEBUG:
+		return "DDD";
+	}
+	return "???";
+}
+
+#ifdef DUK_USE_DPRINT_COLORS
+
+/* http://en.wikipedia.org/wiki/ANSI_escape_code */
+#define DUK__TERM_REVERSE  "\x1b[7m"
+#define DUK__TERM_BRIGHT   "\x1b[1m"
+#define DUK__TERM_RESET    "\x1b[0m"
+#define DUK__TERM_BLUE     "\x1b[34m"
+#define DUK__TERM_RED      "\x1b[31m"
+
+DUK_LOCAL const char *duk__get_term_1(duk_small_int_t level) {
+	DUK_UNREF(level);
+	return (const char *) DUK__TERM_RED;
+}
+
+DUK_LOCAL const char *duk__get_term_2(duk_small_int_t level) {
+	switch ((int) level) {
+	case DUK_LEVEL_DEBUG:
+		return (const char *) (DUK__TERM_RESET DUK__TERM_BRIGHT);
+	case DUK_LEVEL_DDEBUG:
+		return (const char *) (DUK__TERM_RESET);
+	case DUK_LEVEL_DDDEBUG:
+		return (const char *) (DUK__TERM_RESET DUK__TERM_BLUE);
+	}
+	return (const char *) DUK__TERM_RESET;
+}
+
+DUK_LOCAL const char *duk__get_term_3(duk_small_int_t level) {
+	DUK_UNREF(level);
+	return (const char *) DUK__TERM_RESET;
+}
+
+#else
+
+DUK_LOCAL const char *duk__get_term_1(duk_small_int_t level) {
+	DUK_UNREF(level);
+	return (const char *) "";
+}
+
+DUK_LOCAL const char *duk__get_term_2(duk_small_int_t level) {
+	DUK_UNREF(level);
+	return (const char *) "";
+}
+
+DUK_LOCAL const char *duk__get_term_3(duk_small_int_t level) {
+	DUK_UNREF(level);
+	return (const char *) "";
+}
+
+#endif  /* DUK_USE_DPRINT_COLORS */
+
+#ifdef DUK_USE_VARIADIC_MACROS
+
+DUK_INTERNAL void duk_debug_log(duk_small_int_t level, const char *file, duk_int_t line, const char *func, const char *fmt, ...) {
+	va_list ap;
+
+	va_start(ap, fmt);
+
+	DUK_MEMZERO((void *) duk__debug_buf, (size_t) DUK__DEBUG_BUFSIZE);
+	duk_debug_vsnprintf(duk__debug_buf, DUK__DEBUG_BUFSIZE - 1, fmt, ap);
+
+	DUK_FPRINTF(DUK_STDERR, "%s[%s] %s:%ld (%s):%s %s%s\n",
+	            (const char *) duk__get_term_1(level),
+	            (const char *) duk__get_level_string(level),
+	            (const char *) file,
+	            (long) line,
+	            (const char *) func,
+	            (const char *) duk__get_term_2(level),
+	            (const char *) duk__debug_buf,
+	            (const char *) duk__get_term_3(level));
+	DUK_FFLUSH(DUK_STDERR);
+
+	va_end(ap);
+}
+
+#else  /* DUK_USE_VARIADIC_MACROS */
+
+DUK_INTERNAL char duk_debug_file_stash[DUK_DEBUG_STASH_SIZE];
+DUK_INTERNAL char duk_debug_line_stash[DUK_DEBUG_STASH_SIZE];
+DUK_INTERNAL char duk_debug_func_stash[DUK_DEBUG_STASH_SIZE];
+DUK_INTERNAL duk_small_int_t duk_debug_level_stash;
+
+DUK_INTERNAL void duk_debug_log(const char *fmt, ...) {
+	va_list ap;
+	duk_small_int_t level = duk_debug_level_stash;
+
+	va_start(ap, fmt);
+
+	DUK_MEMZERO((void *) duk__debug_buf, (size_t) DUK__DEBUG_BUFSIZE);
+	duk_debug_vsnprintf(duk__debug_buf, DUK__DEBUG_BUFSIZE - 1, fmt, ap);
+
+	DUK_FPRINTF(DUK_STDERR, "%s[%s] %s:%s (%s):%s %s%s\n",
+	            (const char *) duk__get_term_1(level),
+	            (const char *) duk__get_level_string(duk_debug_level_stash),
+	            (const char *) duk_debug_file_stash,
+	            (const char *) duk_debug_line_stash,
+	            (const char *) duk_debug_func_stash,
+	            (const char *) duk__get_term_2(level),
+	            (const char *) duk__debug_buf,
+	            (const char *) duk__get_term_3(level));
+	DUK_FFLUSH(DUK_STDERR);
+
+	va_end(ap);
+}
+
+#endif  /* DUK_USE_VARIADIC_MACROS */
+
+#else  /* DUK_USE_DEBUG */
+
+/*
+ *  Debugging disabled
+ */
+
+#endif  /* DUK_USE_DEBUG */

http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/df353561/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_vsnprintf.c
----------------------------------------------------------------------
diff --git a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_vsnprintf.c b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_vsnprintf.c
new file mode 100644
index 0000000..50881c5
--- /dev/null
+++ b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_debug_vsnprintf.c
@@ -0,0 +1,1049 @@
+/*
+ *  Custom formatter for debug printing, allowing Duktape specific data
+ *  structures (such as tagged values and heap objects) to be printed with
+ *  a nice format string.  Because debug printing should not affect execution
+ *  state, formatting here must be independent of execution (see implications
+ *  below) and must not allocate memory.
+ *
+ *  Custom format tags begin with a '%!' to safely distinguish them from
+ *  standard format tags.  The following conversions are supported:
+ *
+ *     %!T    tagged value (duk_tval *)
+ *     %!O    heap object (duk_heaphdr *)
+ *     %!I    decoded bytecode instruction
+ *     %!C    bytecode instruction opcode name (arg is long)
+ *
+ *  Everything is serialized in a JSON-like manner.  The default depth is one
+ *  level, internal prototype is not followed, and internal properties are not
+ *  serialized.  The following modifiers change this behavior:
+ *
+ *     @      print pointers
+ *     #      print binary representations (where applicable)
+ *     d      deep traversal of own properties (not prototype)
+ *     p      follow prototype chain (useless without 'd')
+ *     i      include internal properties (other than prototype)
+ *     x      hexdump buffers
+ *     h      heavy formatting
+ *
+ *  For instance, the following serializes objects recursively, but does not
+ *  follow the prototype chain nor print internal properties: "%!dO".
+ *
+ *  Notes:
+ *
+ *    * Standard snprintf return value semantics seem to vary.  This
+ *      implementation returns the number of bytes it actually wrote
+ *      (excluding the null terminator).  If retval == buffer size,
+ *      output was truncated (except for corner cases).
+ *
+ *    * Output format is intentionally different from Ecmascript
+ *      formatting requirements, as formatting here serves debugging
+ *      of internals.
+ *
+ *    * Depth checking (and updating) is done in each type printer
+ *      separately, to allow them to call each other freely.
+ *
+ *    * Some pathological structures might take ages to print (e.g.
+ *      self recursion with 100 properties pointing to the object
+ *      itself).  To guard against these, each printer also checks
+ *      whether the output buffer is full; if so, early exit.
+ *
+ *    * Reference loops are detected using a loop stack.
+ */
+
+#include "duk_internal.h"
+
+#ifdef DUK_USE_DEBUG
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+
+/* list of conversion specifiers that terminate a format tag;
+ * this is unfortunately guesswork.
+ */
+#define DUK__ALLOWED_STANDARD_SPECIFIERS  "diouxXeEfFgGaAcsCSpnm"
+
+/* maximum length of standard format tag that we support */
+#define DUK__MAX_FORMAT_TAG_LENGTH  32
+
+/* heapobj recursion depth when deep printing is selected */
+#define DUK__DEEP_DEPTH_LIMIT  8
+
+/* maximum recursion depth for loop detection stacks */
+#define DUK__LOOP_STACK_DEPTH  256
+
+/* must match bytecode defines now; build autogenerate? */
+DUK_LOCAL const char *duk__bc_optab[64] = {
+	"LDREG",    "STREG",    "LDCONST",  "LDINT",    "LDINTX",   "MPUTOBJ",  "MPUTOBJI", "MPUTARR",  "MPUTARRI", "NEW",
+	"NEWI",     "REGEXP",   "CSREG",    "CSREGI",   "GETVAR",   "PUTVAR",   "DECLVAR",  "DELVAR",   "CSVAR",    "CSVARI",
+	"CLOSURE",  "GETPROP",  "PUTPROP",  "DELPROP",  "CSPROP",   "CSPROPI",  "ADD",      "SUB",      "MUL",      "DIV",
+	"MOD",      "BAND",     "BOR",      "BXOR",     "BASL",     "BLSR",     "BASR",     "EQ",       "NEQ",      "SEQ",
+	"SNEQ",     "GT",       "GE",       "LT",       "LE",       "IF",       "JUMP",     "RETURN",   "CALL",     "CALLI",
+	"TRYCATCH", "EXTRA",    "PREINCR",  "PREDECR",  "POSTINCR", "POSTDECR", "PREINCV",  "PREDECV",  "POSTINCV", "POSTDECV",
+	"PREINCP",  "PREDECP",  "POSTINCP", "POSTDECP"
+};
+
+DUK_LOCAL const char *duk__bc_extraoptab[256] = {
+	"NOP", "INVALID", "LDTHIS", "LDUNDEF", "LDNULL", "LDTRUE", "LDFALSE", "NEWOBJ", "NEWARR", "SETALEN",
+	"TYPEOF", "TYPEOFID", "INITENUM", "NEXTENUM", "INITSET", "INITSETI", "INITGET", "INITGETI", "ENDTRY", "ENDCATCH",
+	"ENDFIN", "THROW", "INVLHS", "UNM", "UNP", "DEBUGGER", "BREAK", "CONTINUE", "BNOT", "LNOT",
+	"INSTOF", "IN", "LABEL", "ENDLABEL", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX",
+
+	"XXX", "XXX", "XXX", "XXX", "XXX", "XXX"
+};
+
+typedef struct duk__dprint_state duk__dprint_state;
+struct duk__dprint_state {
+	duk_fixedbuffer *fb;
+
+	/* loop_stack_index could be perhaps be replaced by 'depth', but it's nice
+	 * to not couple these two mechanisms unnecessarily.
+	 */
+	duk_hobject *loop_stack[DUK__LOOP_STACK_DEPTH];
+	duk_int_t loop_stack_index;
+	duk_int_t loop_stack_limit;
+
+	duk_int_t depth;
+	duk_int_t depth_limit;
+
+	duk_bool_t pointer;
+	duk_bool_t heavy;
+	duk_bool_t binary;
+	duk_bool_t follow_proto;
+	duk_bool_t internal;
+	duk_bool_t hexdump;
+};
+
+/* helpers */
+DUK_LOCAL_DECL void duk__print_hstring(duk__dprint_state *st, duk_hstring *k, duk_bool_t quotes);
+DUK_LOCAL_DECL void duk__print_hobject(duk__dprint_state *st, duk_hobject *h);
+DUK_LOCAL_DECL void duk__print_hbuffer(duk__dprint_state *st, duk_hbuffer *h);
+DUK_LOCAL_DECL void duk__print_tval(duk__dprint_state *st, duk_tval *tv);
+DUK_LOCAL_DECL void duk__print_instr(duk__dprint_state *st, duk_instr_t ins);
+DUK_LOCAL_DECL void duk__print_heaphdr(duk__dprint_state *st, duk_heaphdr *h);
+DUK_LOCAL_DECL void duk__print_shared_heaphdr(duk__dprint_state *st, duk_heaphdr *h);
+DUK_LOCAL_DECL void duk__print_shared_heaphdr_string(duk__dprint_state *st, duk_heaphdr_string *h);
+
+DUK_LOCAL void duk__print_shared_heaphdr(duk__dprint_state *st, duk_heaphdr *h) {
+	duk_fixedbuffer *fb = st->fb;
+
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "(%p)", (void *) h);
+	}
+
+	if (!h) {
+		return;
+	}
+
+	if (st->binary) {
+		duk_size_t i;
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LBRACKET);
+		for (i = 0; i < (duk_size_t) sizeof(*h); i++) {
+			duk_fb_sprintf(fb, "%02lx", (unsigned long) ((duk_uint8_t *)h)[i]);
+		}
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RBRACKET);
+	}
+
+#ifdef DUK_USE_REFERENCE_COUNTING  /* currently implicitly also DUK_USE_DOUBLE_LINKED_HEAP */
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "[h_next=%p,h_prev=%p,h_refcount=%lu,h_flags=%08lx,type=%ld,"
+		               "reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]",
+		               (void *) DUK_HEAPHDR_GET_NEXT(NULL, h),
+		               (void *) DUK_HEAPHDR_GET_PREV(NULL, h),
+		               (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(h),
+		               (unsigned long) DUK_HEAPHDR_GET_FLAGS(h),
+		               (long) DUK_HEAPHDR_GET_TYPE(h),
+		               (long) (DUK_HEAPHDR_HAS_REACHABLE(h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_TEMPROOT(h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZABLE(h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZED(h) ? 1 : 0));
+	}
+#else
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "[h_next=%p,h_flags=%08lx,type=%ld,reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]",
+		               (void *) DUK_HEAPHDR_GET_NEXT(NULL, h),
+		               (unsigned long) DUK_HEAPHDR_GET_FLAGS(h),
+		               (long) DUK_HEAPHDR_GET_TYPE(h),
+		               (long) (DUK_HEAPHDR_HAS_REACHABLE(h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_TEMPROOT(h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZABLE(h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZED(h) ? 1 : 0));
+	}
+#endif
+}
+
+DUK_LOCAL void duk__print_shared_heaphdr_string(duk__dprint_state *st, duk_heaphdr_string *h) {
+	duk_fixedbuffer *fb = st->fb;
+
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "(%p)", (void *) h);
+	}
+
+	if (!h) {
+		return;
+	}
+
+	if (st->binary) {
+		duk_size_t i;
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LBRACKET);
+		for (i = 0; i < (duk_size_t) sizeof(*h); i++) {
+			duk_fb_sprintf(fb, "%02lx", (unsigned long) ((duk_uint8_t *)h)[i]);
+		}
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RBRACKET);
+	}
+
+#ifdef DUK_USE_REFERENCE_COUNTING
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "[h_refcount=%lu,h_flags=%08lx,type=%ld,reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]",
+		               (unsigned long) DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h),
+		               (unsigned long) DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) h),
+		               (long) DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) h),
+		               (long) (DUK_HEAPHDR_HAS_REACHABLE((duk_heaphdr *) h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_TEMPROOT((duk_heaphdr *) h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZABLE((duk_heaphdr *) h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) h) ? 1 : 0));
+	}
+#else
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "[h_flags=%08lx,type=%ld,reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]",
+		               (unsigned long) DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) h),
+		               (long) DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) h),
+		               (long) (DUK_HEAPHDR_HAS_REACHABLE((duk_heaphdr *) h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_TEMPROOT((duk_heaphdr *) h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZABLE((duk_heaphdr *) h) ? 1 : 0),
+		               (long) (DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) h) ? 1 : 0));
+	}
+#endif
+}
+
+DUK_LOCAL void duk__print_hstring(duk__dprint_state *st, duk_hstring *h, duk_bool_t quotes) {
+	duk_fixedbuffer *fb = st->fb;
+	const duk_uint8_t *p;
+	const duk_uint8_t *p_end;
+
+	/* terminal type: no depth check */
+
+	if (duk_fb_is_full(fb)) {
+		return;
+	}
+
+	duk__print_shared_heaphdr_string(st, &h->hdr);
+
+	if (!h) {
+		duk_fb_put_cstring(fb, "NULL");
+		return;
+	}
+
+	p = DUK_HSTRING_GET_DATA(h);
+	p_end = p + DUK_HSTRING_GET_BYTELEN(h);
+
+	if (p_end > p && p[0] == DUK_ASC_UNDERSCORE) {
+		/* if property key begins with underscore, encode it with
+		 * forced quotes (e.g. "_Foo") to distinguish it from encoded
+		 * internal properties (e.g. \xffBar -> _Bar).
+		 */
+		quotes = 1;
+	}
+
+	if (quotes) {
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_DOUBLEQUOTE);
+	}
+	while (p < p_end) {
+		duk_uint8_t ch = *p++;
+
+		/* two special escapes: '\' and '"', other printables as is */
+		if (ch == '\\') {
+			duk_fb_sprintf(fb, "\\\\");
+		} else if (ch == '"') {
+			duk_fb_sprintf(fb, "\\\"");
+		} else if (ch >= 0x20 && ch <= 0x7e) {
+			duk_fb_put_byte(fb, ch);
+		} else if (ch == 0xff && !quotes) {
+			/* encode \xffBar as _Bar if no quotes are applied, this is for
+			 * readable internal keys.
+			 */
+			duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_UNDERSCORE);
+		} else {
+			duk_fb_sprintf(fb, "\\x%02lx", (unsigned long) ch);
+		}
+	}
+	if (quotes) {
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_DOUBLEQUOTE);
+	}
+#ifdef DUK_USE_REFERENCE_COUNTING
+	/* XXX: limit to quoted strings only, to save keys from being cluttered? */
+	duk_fb_sprintf(fb, "/%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(&h->hdr));
+#endif
+}
+
+#ifdef DUK__COMMA
+#undef DUK__COMMA
+#endif
+#define DUK__COMMA()  do { \
+		if (first) { \
+			first = 0; \
+		} else { \
+			duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_COMMA); \
+		} \
+	} while (0)
+
+DUK_LOCAL void duk__print_hobject(duk__dprint_state *st, duk_hobject *h) {
+	duk_fixedbuffer *fb = st->fb;
+	duk_uint_fast32_t i;
+	duk_tval *tv;
+	duk_hstring *key;
+	duk_bool_t first = 1;
+	const char *brace1 = "{";
+	const char *brace2 = "}";
+	duk_bool_t pushed_loopstack = 0;
+
+	if (duk_fb_is_full(fb)) {
+		return;
+	}
+
+	duk__print_shared_heaphdr(st, &h->hdr);
+
+	if (h && DUK_HOBJECT_HAS_ARRAY_PART(h)) {
+		brace1 = "[";
+		brace2 = "]";
+	}
+
+	if (!h) {
+		duk_fb_put_cstring(fb, "NULL");
+		goto finished;
+	}
+
+	if (st->depth >= st->depth_limit) {
+		if (DUK_HOBJECT_IS_COMPILEDFUNCTION(h)) {
+			duk_fb_sprintf(fb, "%sobject/compiledfunction %p%s", (const char *) brace1, (void *) h, (const char *) brace2);
+		} else if (DUK_HOBJECT_IS_NATIVEFUNCTION(h)) {
+			duk_fb_sprintf(fb, "%sobject/nativefunction %p%s", (const char *) brace1, (void *) h, (const char *) brace2);
+		} else if (DUK_HOBJECT_IS_THREAD(h)) {
+			duk_fb_sprintf(fb, "%sobject/thread %p%s", (const char *) brace1, (void *) h, (const char *) brace2);
+		} else {
+			duk_fb_sprintf(fb, "%sobject %p%s", (const char *) brace1, (void *) h, (const char *) brace2);  /* may be NULL */
+		}
+		return;
+	}
+
+	for (i = 0; i < (duk_uint_fast32_t) st->loop_stack_index; i++) {
+		if (st->loop_stack[i] == h) {
+			duk_fb_sprintf(fb, "%sLOOP:%p%s", (const char *) brace1, (void *) h, (const char *) brace2);
+			return;
+		}
+	}
+
+	/* after this, return paths should 'goto finished' for decrement */
+	st->depth++;
+
+	if (st->loop_stack_index >= st->loop_stack_limit) {
+		duk_fb_sprintf(fb, "%sOUT-OF-LOOP-STACK%s", (const char *) brace1, (const char *) brace2);
+		goto finished;
+	}
+	st->loop_stack[st->loop_stack_index++] = h;
+	pushed_loopstack = 1;
+
+	/*
+	 *  Notation: double underscore used for internal properties which are not
+	 *  stored in the property allocation (e.g. '__valstack').
+	 */
+
+	duk_fb_put_cstring(fb, brace1);
+
+	if (DUK_HOBJECT_GET_PROPS(NULL, h)) {
+		duk_uint32_t a_limit;
+
+		a_limit = DUK_HOBJECT_GET_ASIZE(h);
+		if (st->internal) {
+			/* dump all allocated entries, unused entries print as 'unused',
+			 * note that these may extend beyond current 'length' and look
+			 * a bit funny.
+			 */
+		} else {
+			/* leave out trailing 'unused' elements */
+			while (a_limit > 0) {
+				tv = DUK_HOBJECT_A_GET_VALUE_PTR(NULL, h, a_limit - 1);
+				if (!DUK_TVAL_IS_UNUSED(tv)) {
+					break;
+				}
+				a_limit--;
+			}
+		}
+
+		for (i = 0; i < a_limit; i++) {
+			tv = DUK_HOBJECT_A_GET_VALUE_PTR(NULL, h, i);
+			DUK__COMMA();
+			duk__print_tval(st, tv);
+		}
+		for (i = 0; i < DUK_HOBJECT_GET_ENEXT(h); i++) {
+			key = DUK_HOBJECT_E_GET_KEY(NULL, h, i);
+			if (!key) {
+				continue;
+			}
+			if (!st->internal &&
+			    DUK_HSTRING_GET_BYTELEN(key) > 0 &&
+			    DUK_HSTRING_GET_DATA(key)[0] == 0xff) {
+				/* XXX: use DUK_HSTRING_FLAG_INTERNAL? */
+				continue;
+			}
+			DUK__COMMA();
+			duk__print_hstring(st, key, 0);
+			duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_COLON);
+			if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(NULL, h, i)) {
+				duk_fb_sprintf(fb, "[get:%p,set:%p]",
+				               (void *) DUK_HOBJECT_E_GET_VALUE(NULL, h, i).a.get,
+				               (void *) DUK_HOBJECT_E_GET_VALUE(NULL, h, i).a.set);
+			} else {
+				tv = &DUK_HOBJECT_E_GET_VALUE(NULL, h, i).v;
+				duk__print_tval(st, tv);
+			}
+			if (st->heavy) {
+				duk_fb_sprintf(fb, "<%02lx>", (unsigned long) DUK_HOBJECT_E_GET_FLAGS(NULL, h, i));
+			}
+		}
+	}
+	if (st->internal) {
+		if (DUK_HOBJECT_HAS_EXTENSIBLE(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__extensible:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_CONSTRUCTABLE(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__constructable:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_BOUND(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__bound:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_COMPILEDFUNCTION(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__compiledfunction:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_NATIVEFUNCTION(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__nativefunction:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_THREAD(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__thread:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_ARRAY_PART(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__array_part:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_STRICT(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__strict:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_NEWENV(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__newenv:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_NAMEBINDING(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__namebinding:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_CREATEARGS(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__createargs:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_ENVRECCLOSED(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__envrecclosed:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_array:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_stringobj:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_arguments:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_EXOTIC_DUKFUNC(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_dukfunc:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_IS_BUFFEROBJECT(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_bufferobj:true");
+		} else {
+			;
+		}
+		if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h)) {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_proxyobj:true");
+		} else {
+			;
+		}
+	}
+	if (st->internal && DUK_HOBJECT_IS_COMPILEDFUNCTION(h)) {
+		duk_hcompiledfunction *f = (duk_hcompiledfunction *) h;
+		DUK__COMMA(); duk_fb_put_cstring(fb, "__data:");
+		duk__print_hbuffer(st, (duk_hbuffer *) DUK_HCOMPILEDFUNCTION_GET_DATA(NULL, f));
+		DUK__COMMA(); duk_fb_sprintf(fb, "__nregs:%ld", (long) f->nregs);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__nargs:%ld", (long) f->nargs);
+#if defined(DUK_USE_DEBUGGER_SUPPORT)
+		DUK__COMMA(); duk_fb_sprintf(fb, "__start_line:%ld", (long) f->start_line);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__end_line:%ld", (long) f->end_line);
+#endif
+		DUK__COMMA(); duk_fb_put_cstring(fb, "__data:");
+		duk__print_hbuffer(st, (duk_hbuffer *) DUK_HCOMPILEDFUNCTION_GET_DATA(NULL, f));
+	} else if (st->internal && DUK_HOBJECT_IS_NATIVEFUNCTION(h)) {
+		duk_hnativefunction *f = (duk_hnativefunction *) h;
+		DUK__COMMA(); duk_fb_sprintf(fb, "__func:");
+		duk_fb_put_funcptr(fb, (duk_uint8_t *) &f->func, sizeof(f->func));
+		DUK__COMMA(); duk_fb_sprintf(fb, "__nargs:%ld", (long) f->nargs);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__magic:%ld", (long) f->magic);
+	} else if (st->internal && DUK_HOBJECT_IS_BUFFEROBJECT(h)) {
+		duk_hbufferobject *b = (duk_hbufferobject *) h;
+		DUK__COMMA(); duk_fb_sprintf(fb, "__buf:");
+		duk__print_hbuffer(st, (duk_hbuffer *) b->buf);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__offset:%ld", (long) b->offset);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__length:%ld", (long) b->length);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__shift:%ld", (long) b->shift);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__elemtype:%ld", (long) b->elem_type);
+	} else if (st->internal && DUK_HOBJECT_IS_THREAD(h)) {
+		duk_hthread *t = (duk_hthread *) h;
+		DUK__COMMA(); duk_fb_sprintf(fb, "__strict:%ld", (long) t->strict);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__state:%ld", (long) t->state);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__unused1:%ld", (long) t->unused1);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__unused2:%ld", (long) t->unused2);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_max:%ld", (long) t->valstack_max);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__callstack_max:%ld", (long) t->callstack_max);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__catchstack_max:%ld", (long) t->catchstack_max);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__valstack:%p", (void *) t->valstack);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_end:%p/%ld", (void *) t->valstack_end, (long) (t->valstack_end - t->valstack));
+		DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_bottom:%p/%ld", (void *) t->valstack_bottom, (long) (t->valstack_bottom - t->valstack));
+		DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_top:%p/%ld", (void *) t->valstack_top, (long) (t->valstack_top - t->valstack));
+		DUK__COMMA(); duk_fb_sprintf(fb, "__catchstack:%p", (void *) t->catchstack);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__catchstack_size:%ld", (long) t->catchstack_size);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__catchstack_top:%ld", (long) t->catchstack_top);
+		DUK__COMMA(); duk_fb_sprintf(fb, "__resumer:"); duk__print_hobject(st, (duk_hobject *) t->resumer);
+		/* XXX: print built-ins array? */
+
+	}
+#ifdef DUK_USE_REFERENCE_COUNTING
+	if (st->internal) {
+		DUK__COMMA(); duk_fb_sprintf(fb, "__refcount:%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h));
+	}
+#endif
+	if (st->internal) {
+		DUK__COMMA(); duk_fb_sprintf(fb, "__class:%ld", (long) DUK_HOBJECT_GET_CLASS_NUMBER(h));
+	}
+
+	DUK__COMMA(); duk_fb_sprintf(fb, "__heapptr:%p", (void *) h);  /* own pointer */
+
+	/* prototype should be last, for readability */
+	if (DUK_HOBJECT_GET_PROTOTYPE(NULL, h)) {
+		if (st->follow_proto) {
+			DUK__COMMA(); duk_fb_put_cstring(fb, "__prototype:"); duk__print_hobject(st, DUK_HOBJECT_GET_PROTOTYPE(NULL, h));
+		} else {
+			DUK__COMMA(); duk_fb_sprintf(fb, "__prototype:%p", (void *) DUK_HOBJECT_GET_PROTOTYPE(NULL, h));
+		}
+	}
+
+	duk_fb_put_cstring(fb, brace2);
+
+#if defined(DUK_USE_HOBJECT_HASH_PART)
+	if (st->heavy && DUK_HOBJECT_GET_HSIZE(h) > 0) {
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LANGLE);
+		for (i = 0; i < DUK_HOBJECT_GET_HSIZE(h); i++) {
+			duk_uint_t h_idx = DUK_HOBJECT_H_GET_INDEX(NULL, h, i);
+			if (i > 0) {
+				duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_COMMA);
+			}
+			if (h_idx == DUK_HOBJECT_HASHIDX_UNUSED) {
+				duk_fb_sprintf(fb, "u");
+			} else if (h_idx == DUK_HOBJECT_HASHIDX_DELETED) {
+				duk_fb_sprintf(fb, "d");
+			} else {
+				duk_fb_sprintf(fb, "%ld", (long) h_idx);
+			}
+		}
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RANGLE);
+	}
+#endif
+
+ finished:
+	st->depth--;
+	if (pushed_loopstack) {
+		st->loop_stack_index--;
+		st->loop_stack[st->loop_stack_index] = NULL;
+	}
+}
+
+#undef DUK__COMMA
+
+DUK_LOCAL void duk__print_hbuffer(duk__dprint_state *st, duk_hbuffer *h) {
+	duk_fixedbuffer *fb = st->fb;
+	duk_size_t i, n;
+	duk_uint8_t *p;
+
+	if (duk_fb_is_full(fb)) {
+		return;
+	}
+
+	/* terminal type: no depth check */
+
+	if (!h) {
+		duk_fb_put_cstring(fb, "NULL");
+		return;
+	}
+
+	if (DUK_HBUFFER_HAS_DYNAMIC(h)) {
+		if (DUK_HBUFFER_HAS_EXTERNAL(h)) {
+			duk_hbuffer_external *g = (duk_hbuffer_external *) h;
+			duk_fb_sprintf(fb, "buffer:external:%p:%ld",
+			               (void *) DUK_HBUFFER_EXTERNAL_GET_DATA_PTR(NULL, g),
+			               (long) DUK_HBUFFER_EXTERNAL_GET_SIZE(g));
+		} else {
+			duk_hbuffer_dynamic *g = (duk_hbuffer_dynamic *) h;
+			duk_fb_sprintf(fb, "buffer:dynamic:%p:%ld",
+			               (void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(NULL, g),
+			               (long) DUK_HBUFFER_DYNAMIC_GET_SIZE(g));
+		}
+	} else {
+		duk_fb_sprintf(fb, "buffer:fixed:%ld", (long) DUK_HBUFFER_GET_SIZE(h));
+	}
+
+#ifdef DUK_USE_REFERENCE_COUNTING
+	duk_fb_sprintf(fb, "/%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(&h->hdr));
+#endif
+
+	if (st->hexdump) {
+		duk_fb_sprintf(fb, "=[");
+		n = DUK_HBUFFER_GET_SIZE(h);
+		p = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(NULL, h);
+		for (i = 0; i < n; i++) {
+			duk_fb_sprintf(fb, "%02lx", (unsigned long) p[i]);
+		}
+		duk_fb_sprintf(fb, "]");
+	}
+}
+
+DUK_LOCAL void duk__print_heaphdr(duk__dprint_state *st, duk_heaphdr *h) {
+	duk_fixedbuffer *fb = st->fb;
+
+	if (duk_fb_is_full(fb)) {
+		return;
+	}
+
+	if (!h) {
+		duk_fb_put_cstring(fb, "NULL");
+		return;
+	}
+
+	switch (DUK_HEAPHDR_GET_TYPE(h)) {
+	case DUK_HTYPE_STRING:
+		duk__print_hstring(st, (duk_hstring *) h, 1);
+		break;
+	case DUK_HTYPE_OBJECT:
+		duk__print_hobject(st, (duk_hobject *) h);
+		break;
+	case DUK_HTYPE_BUFFER:
+		duk__print_hbuffer(st, (duk_hbuffer *) h);
+		break;
+	default:
+		duk_fb_sprintf(fb, "[unknown htype %ld]", (long) DUK_HEAPHDR_GET_TYPE(h));
+		break;
+	}
+}
+
+DUK_LOCAL void duk__print_tval(duk__dprint_state *st, duk_tval *tv) {
+	duk_fixedbuffer *fb = st->fb;
+
+	if (duk_fb_is_full(fb)) {
+		return;
+	}
+
+	/* depth check is done when printing an actual type */
+
+	if (st->heavy) {
+		duk_fb_sprintf(fb, "(%p)", (void *) tv);
+	}
+
+	if (!tv) {
+		duk_fb_put_cstring(fb, "NULL");
+		return;
+	}
+
+	if (st->binary) {
+		duk_size_t i;
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LBRACKET);
+		for (i = 0; i < (duk_size_t) sizeof(*tv); i++) {
+			duk_fb_sprintf(fb, "%02lx", (unsigned long) ((duk_uint8_t *)tv)[i]);
+		}
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RBRACKET);
+	}
+
+	if (st->heavy) {
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LANGLE);
+	}
+	switch (DUK_TVAL_GET_TAG(tv)) {
+	case DUK_TAG_UNDEFINED: {
+		duk_fb_put_cstring(fb, "undefined");
+		break;
+	}
+	case DUK_TAG_UNUSED: {
+		duk_fb_put_cstring(fb, "unused");
+		break;
+	}
+	case DUK_TAG_NULL: {
+		duk_fb_put_cstring(fb, "null");
+		break;
+	}
+	case DUK_TAG_BOOLEAN: {
+		duk_fb_put_cstring(fb, DUK_TVAL_GET_BOOLEAN(tv) ? "true" : "false");
+		break;
+	}
+	case DUK_TAG_STRING: {
+		/* Note: string is a terminal heap object, so no depth check here */
+		duk__print_hstring(st, DUK_TVAL_GET_STRING(tv), 1);
+		break;
+	}
+	case DUK_TAG_OBJECT: {
+		duk__print_hobject(st, DUK_TVAL_GET_OBJECT(tv));
+		break;
+	}
+	case DUK_TAG_BUFFER: {
+		duk__print_hbuffer(st, DUK_TVAL_GET_BUFFER(tv));
+		break;
+	}
+	case DUK_TAG_POINTER: {
+		duk_fb_sprintf(fb, "pointer:%p", (void *) DUK_TVAL_GET_POINTER(tv));
+		break;
+	}
+	case DUK_TAG_LIGHTFUNC: {
+		duk_c_function func;
+		duk_small_uint_t lf_flags;
+
+		DUK_TVAL_GET_LIGHTFUNC(tv, func, lf_flags);
+		duk_fb_sprintf(fb, "lightfunc:");
+		duk_fb_put_funcptr(fb, (duk_uint8_t *) &func, sizeof(func));
+		duk_fb_sprintf(fb, ":%04lx", (long) lf_flags);
+		break;
+	}
+#if defined(DUK_USE_FASTINT)
+	case DUK_TAG_FASTINT:
+#endif
+	default: {
+		/* IEEE double is approximately 16 decimal digits; print a couple extra */
+		DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv));
+		DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv));
+		duk_fb_sprintf(fb, "%.18g", (double) DUK_TVAL_GET_NUMBER(tv));
+		break;
+	}
+	}
+	if (st->heavy) {
+		duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RANGLE);
+	}
+}
+
+DUK_LOCAL void duk__print_instr(duk__dprint_state *st, duk_instr_t ins) {
+	duk_fixedbuffer *fb = st->fb;
+	duk_small_int_t op;
+	const char *op_name;
+	const char *extraop_name;
+
+	op = (duk_small_int_t) DUK_DEC_OP(ins);
+	op_name = duk__bc_optab[op];
+
+	/* XXX: option to fix opcode length so it lines up nicely */
+
+	if (op == DUK_OP_EXTRA) {
+		extraop_name = duk__bc_extraoptab[DUK_DEC_A(ins)];
+
+		duk_fb_sprintf(fb, "%s %ld, %ld",
+		               (const char *) extraop_name, (long) DUK_DEC_B(ins), (long) DUK_DEC_C(ins));
+	} else if (op == DUK_OP_JUMP) {
+		duk_int_t diff1 = DUK_DEC_ABC(ins) - DUK_BC_JUMP_BIAS;  /* from next pc */
+		duk_int_t diff2 = diff1 + 1;                            /* from curr pc */
+
+		duk_fb_sprintf(fb, "%s %ld (to pc%c%ld)",
+		               (const char *) op_name, (long) diff1,
+		               (int) (diff2 >= 0 ? '+' : '-'),  /* char format: use int */
+		               (long) (diff2 >= 0 ? diff2 : -diff2));
+	} else {
+		duk_fb_sprintf(fb, "%s %ld, %ld, %ld",
+		               (const char *) op_name, (long) DUK_DEC_A(ins),
+		               (long) DUK_DEC_B(ins), (long) DUK_DEC_C(ins));
+	}
+}
+
+DUK_LOCAL void duk__print_opcode(duk__dprint_state *st, duk_small_int_t opcode) {
+	duk_fixedbuffer *fb = st->fb;
+
+	if (opcode < DUK_BC_OP_MIN || opcode > DUK_BC_OP_MAX) {
+		duk_fb_sprintf(fb, "?(%ld)", (long) opcode);
+	} else {
+		duk_fb_sprintf(fb, "%s", (const char *) duk__bc_optab[opcode]);
+	}
+}
+
+DUK_INTERNAL duk_int_t duk_debug_vsnprintf(char *str, duk_size_t size, const char *format, va_list ap) {
+	duk_fixedbuffer fb;
+	const char *p = format;
+	const char *p_end = p + DUK_STRLEN(format);
+	duk_int_t retval;
+
+	DUK_MEMZERO(&fb, sizeof(fb));
+	fb.buffer = (duk_uint8_t *) str;
+	fb.length = size;
+	fb.offset = 0;
+	fb.truncated = 0;
+
+	while (p < p_end) {
+		char ch = *p++;
+		const char *p_begfmt = NULL;
+		duk_bool_t got_exclamation = 0;
+		duk_bool_t got_long = 0;  /* %lf, %ld etc */
+		duk__dprint_state st;
+
+		if (ch != DUK_ASC_PERCENT) {
+			duk_fb_put_byte(&fb, (duk_uint8_t) ch);
+			continue;
+		}
+
+		/*
+		 *  Format tag parsing.  Since we don't understand all the
+		 *  possible format tags allowed, we just scan for a terminating
+		 *  specifier and keep track of relevant modifiers that we do
+		 *  understand.  See man 3 printf.
+		 */
+
+		DUK_MEMZERO(&st, sizeof(st));
+		st.fb = &fb;
+		st.depth = 0;
+		st.depth_limit = 1;
+		st.loop_stack_index = 0;
+		st.loop_stack_limit = DUK__LOOP_STACK_DEPTH;
+
+		p_begfmt = p - 1;
+		while (p < p_end) {
+			ch = *p++;
+
+			if (ch == DUK_ASC_STAR) {
+				/* unsupported: would consume multiple args */
+				goto error;
+			} else if (ch == DUK_ASC_PERCENT) {
+				duk_fb_put_byte(&fb, (duk_uint8_t) DUK_ASC_PERCENT);
+				break;
+			} else if (ch == DUK_ASC_EXCLAMATION) {
+				got_exclamation = 1;
+			} else if (!got_exclamation && ch == DUK_ASC_LC_L) {
+				got_long = 1;
+			} else if (got_exclamation && ch == DUK_ASC_LC_D) {
+				st.depth_limit = DUK__DEEP_DEPTH_LIMIT;
+			} else if (got_exclamation && ch == DUK_ASC_LC_P) {
+				st.follow_proto = 1;
+			} else if (got_exclamation && ch == DUK_ASC_LC_I) {
+				st.internal = 1;
+			} else if (got_exclamation && ch == DUK_ASC_LC_X) {
+				st.hexdump = 1;
+			} else if (got_exclamation && ch == DUK_ASC_LC_H) {
+				st.heavy = 1;
+			} else if (got_exclamation && ch == DUK_ASC_ATSIGN) {
+				st.pointer = 1;
+			} else if (got_exclamation && ch == DUK_ASC_HASH) {
+				st.binary = 1;
+			} else if (got_exclamation && ch == DUK_ASC_UC_T) {
+				duk_tval *t = va_arg(ap, duk_tval *);
+				if (st.pointer && !st.heavy) {
+					duk_fb_sprintf(&fb, "(%p)", (void *) t);
+				}
+				duk__print_tval(&st, t);
+				break;
+			} else if (got_exclamation && ch == DUK_ASC_UC_O) {
+				duk_heaphdr *t = va_arg(ap, duk_heaphdr *);
+				if (st.pointer && !st.heavy) {
+					duk_fb_sprintf(&fb, "(%p)", (void *) t);
+				}
+				duk__print_heaphdr(&st, t);
+				break;
+			} else if (got_exclamation && ch == DUK_ASC_UC_I) {
+				duk_instr_t t = va_arg(ap, duk_instr_t);
+				duk__print_instr(&st, t);
+				break;
+			} else if (got_exclamation && ch == DUK_ASC_UC_C) {
+				long t = va_arg(ap, long);
+				duk__print_opcode(&st, (duk_small_int_t) t);
+				break;
+			} else if (!got_exclamation && strchr(DUK__ALLOWED_STANDARD_SPECIFIERS, (int) ch)) {
+				char fmtbuf[DUK__MAX_FORMAT_TAG_LENGTH];
+				duk_size_t fmtlen;
+
+				DUK_ASSERT(p >= p_begfmt);
+				fmtlen = (duk_size_t) (p - p_begfmt);
+				if (fmtlen >= sizeof(fmtbuf)) {
+					/* format is too large, abort */
+					goto error;
+				}
+				DUK_MEMZERO(fmtbuf, sizeof(fmtbuf));
+				DUK_MEMCPY(fmtbuf, p_begfmt, fmtlen);
+
+				/* assume exactly 1 arg, which is why '*' is forbidden; arg size still
+				 * depends on type though.
+				 */
+
+				if (ch == DUK_ASC_LC_F || ch == DUK_ASC_LC_G || ch == DUK_ASC_LC_E) {
+					/* %f and %lf both consume a 'long' */
+					double arg = va_arg(ap, double);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_D && got_long) {
+					/* %ld */
+					long arg = va_arg(ap, long);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_D) {
+					/* %d; only 16 bits are guaranteed */
+					int arg = va_arg(ap, int);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_U && got_long) {
+					/* %lu */
+					unsigned long arg = va_arg(ap, unsigned long);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_U) {
+					/* %u; only 16 bits are guaranteed */
+					unsigned int arg = va_arg(ap, unsigned int);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_X && got_long) {
+					/* %lx */
+					unsigned long arg = va_arg(ap, unsigned long);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_X) {
+					/* %x; only 16 bits are guaranteed */
+					unsigned int arg = va_arg(ap, unsigned int);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else if (ch == DUK_ASC_LC_S) {
+					/* %s */
+					const char *arg = va_arg(ap, const char *);
+					if (arg == NULL) {
+						/* '%s' and NULL is not portable, so special case
+						 * it for debug printing.
+						 */
+						duk_fb_sprintf(&fb, "NULL");
+					} else {
+						duk_fb_sprintf(&fb, fmtbuf, arg);
+					}
+				} else if (ch == DUK_ASC_LC_P) {
+					/* %p */
+					void *arg = va_arg(ap, void *);
+					if (arg == NULL) {
+						/* '%p' and NULL is portable, but special case it
+						 * anyway to get a standard NULL marker in logs.
+						 */
+						duk_fb_sprintf(&fb, "NULL");
+					} else {
+						duk_fb_sprintf(&fb, fmtbuf, arg);
+					}
+				} else if (ch == DUK_ASC_LC_C) {
+					/* '%c', passed concretely as int */
+					int arg = va_arg(ap, int);
+					duk_fb_sprintf(&fb, fmtbuf, arg);
+				} else {
+					/* Should not happen. */
+					duk_fb_sprintf(&fb, "INVALID-FORMAT(%s)", (const char *) fmtbuf);
+				}
+				break;
+			} else {
+				/* ignore */
+			}
+		}
+	}
+	goto done;
+
+ error:
+	duk_fb_put_cstring(&fb, "FMTERR");
+	/* fall through */
+
+ done:
+	retval = (duk_int_t) fb.offset;
+	duk_fb_put_byte(&fb, (duk_uint8_t) 0);
+
+	/* return total chars written excluding terminator */
+	return retval;
+}
+
+#if 0  /*unused*/
+DUK_INTERNAL duk_int_t duk_debug_snprintf(char *str, duk_size_t size, const char *format, ...) {
+	duk_int_t retval;
+	va_list ap;
+	va_start(ap, format);
+	retval = duk_debug_vsnprintf(str, size, format, ap);
+	va_end(ap);
+	return retval;
+}
+#endif
+
+/* Formatting function pointers is tricky: there is no standard pointer for
+ * function pointers and the size of a function pointer may depend on the
+ * specific pointer type.  This helper formats a function pointer based on
+ * its memory layout to get something useful on most platforms.
+ */
+DUK_INTERNAL void duk_debug_format_funcptr(char *buf, duk_size_t buf_size, duk_uint8_t *fptr, duk_size_t fptr_size) {
+	duk_size_t i;
+	duk_uint8_t *p = (duk_uint8_t *) buf;
+	duk_uint8_t *p_end = (duk_uint8_t *) (buf + buf_size - 1);
+
+	DUK_MEMZERO(buf, buf_size);
+
+	for (i = 0; i < fptr_size; i++) {
+		duk_int_t left = (duk_int_t) (p_end - p);
+		duk_uint8_t ch;
+		if (left <= 0) {
+			break;
+		}
+
+		/* Quite approximate but should be useful for little and big endian. */
+#ifdef DUK_USE_INTEGER_BE
+		ch = fptr[i];
+#else
+		ch = fptr[fptr_size - 1 - i];
+#endif
+		p += DUK_SNPRINTF((char *) p, left, "%02lx", (unsigned long) ch);
+	}
+}
+
+#endif  /* DUK_USE_DEBUG */