1 files changed, 183 insertions, 0 deletions
diff --git a/vere/ext/nasm/asm/srcfile.h b/vere/ext/nasm/asm/srcfile.h
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+++ b/vere/ext/nasm/asm/srcfile.h
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+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 1996-2020 The NASM Authors - All Rights Reserved
+ *   See the file AUTHORS included with the NASM distribution for
+ *   the specific copyright holders.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following
+ *   conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above
+ *     copyright notice, this list of conditions and the following
+ *     disclaimer in the documentation and/or other materials provided
+ *     with the distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * These functions are used to keep track of the source code file and name.
+ */
+#ifndef ASM_SRCFILE_H
+#define ASM_SRCFILE_H
+
+#include "compiler.h"
+
+struct src_location {
+    const char *filename;
+    int32_t lineno;
+};
+
+static inline const_func struct src_location src_nowhere(void)
+{
+    struct src_location no_where = { NULL, 0 };
+    return no_where;
+}
+
+/*
+ * Comparing the *pointer value* of filenames is valid, because the
+ * filename hash system guarantees that each unique filename string is
+ * permanently allocated in exactly one location.
+ */
+static inline bool
+src_location_same(struct src_location here, struct src_location there)
+{
+    return here.filename == there.filename && here.lineno == there.lineno;
+}
+
+struct src_location_stack {
+    struct src_location l;
+    struct src_location_stack *up, *down;
+    const void *macro;
+};
+extern struct src_location_stack _src_top;
+extern struct src_location_stack *_src_bottom;
+extern struct src_location_stack *_src_error;
+
+void src_init(void);
+void src_free(void);
+const char *src_set_fname(const char *newname);
+static inline const char *src_get_fname(void)
+{
+    return _src_bottom->l.filename;
+}
+static inline int32_t src_set_linnum(int32_t newline)
+{
+    int32_t oldline = _src_bottom->l.lineno;
+    _src_bottom->l.lineno = newline;
+    return oldline;
+}
+static inline int32_t src_get_linnum(void)
+{
+    return _src_bottom->l.lineno;
+}
+
+/* Can be used when there is no need for the old information */
+void src_set(int32_t line, const char *filename);
+
+/*
+ * src_get gets both the source file name and line.
+ * It is also used if you maintain private status about the source location
+ * It return 0 if the information was the same as the last time you
+ * checked, -2 if the name changed and (new-old) if just the line changed.
+ *
+ * xname must point to a filename string previously returned from any
+ * function of this subsystem or be NULL; another string value will
+ * not work.
+ */
+static inline int32_t src_get(int32_t *xline, const char **xname)
+{
+    const char *xn = *xname;
+    int32_t xl = *xline;
+    int32_t line = _src_bottom->l.lineno;
+
+    *xline = line;
+    *xname = _src_bottom->l.filename;
+
+    /* The return value is expected to be optimized out almost everywhere */
+    if (!xn || xn != _src_bottom->l.filename)
+        return -2;
+    else
+        return line - xl;
+}
+
+/*
+ * Returns the current information as a structure.
+ */
+static inline struct src_location src_where(void)
+{
+    return _src_bottom->l;
+}
+
+/*
+ * Returns the top-level information as a structure. Use this for panic
+ * errors, since descent is not possible there.
+ */
+static inline struct src_location src_where_top(void)
+{
+    return _src_top.l;
+}
+
+/*
+ * Returns the appropriate level of the location stack to use for error
+ * messages. This is the same as the top level except during the descent
+ * through the macro hierarchy for elucidation;
+ */
+static inline struct src_location src_where_error(void)
+{
+    return _src_error->l;
+}
+static inline const void *src_error_down(void)
+{
+    if (_src_error->down) {
+        _src_error = _src_error->down;
+        return _src_error->macro;
+    } else {
+        return NULL;
+    }
+}
+static inline void src_error_reset(void)
+{
+    _src_error = &_src_top;
+}
+
+/*
+ * Sets the current information. The filename member of the structure
+ * *must* have been previously returned by src_get(), src_where(), or
+ * src_get_fname() and therefore be present in the hash.
+ */
+static inline struct src_location src_update(struct src_location whence)
+{
+    struct src_location old = _src_bottom->l;
+    _src_bottom->l = whence;
+    return old;
+}
+
+/*
+ * Push/pop macro expansion level. "macroname" must remain constant at
+ * least until the same macro expansion level is popped.
+ */
+void src_macro_push(const void *macroname, struct src_location where);
+static inline const void *src_macro_current(void)
+{
+    return _src_bottom->macro;
+}
+void src_macro_pop(void);
+
+#endif /* ASM_SRCFILE_H */