Imported Upstream version 0.7.2upstream/0.7.2

1 files changed, 95 insertions, 0 deletions

diff --git a/fetch.h b/fetch.h
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--- /dev/null
+++ b/fetch.h
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+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef FETCH_H
+#define FETCH_H
+
+#include "forward.h"
+#include "param.h"
+
+/* XXX isn't SYSCALL TOF just a different ABI?  Maybe we needed to
+ * support variant ABIs all along.  */
+enum tof {
+	LT_TOF_FUNCTION,	/* A real library function */
+	LT_TOF_FUNCTIONR,	/* Return from a real library function */
+	LT_TOF_SYSCALL,		/* A syscall */
+	LT_TOF_SYSCALLR,	/* Return from a syscall */
+};
+
+/* The contents of the structure is defined by the back end.  */
+struct fetch_context;
+
+/* Initialize argument fetching.  Returns NULL on failure.  RET_INFO
+ * is the return type of the function.  */
+struct fetch_context *fetch_arg_init(enum tof type, struct Process *proc,
+				     struct arg_type_info *ret_info);
+
+/* Make a clone of context.  */
+struct fetch_context *fetch_arg_clone(struct Process *proc,
+				      struct fetch_context *context);
+
+/* Load next argument.  The function returns 0 on success or a
+ * negative value on failure.  The extracted value is stored in
+ * *VALUEP.  */
+int fetch_arg_next(struct fetch_context *context, enum tof type,
+		   struct Process *proc,
+		   struct arg_type_info *info, struct value *valuep);
+
+/* Load return value.  The function returns 0 on success or a negative
+ * value on failure.  The extracted value is stored in *VALUEP.  */
+int fetch_retval(struct fetch_context *context, enum tof type,
+		 struct Process *proc,
+		 struct arg_type_info *info, struct value *valuep);
+
+/* Destroy fetch context.  CONTEXT shall be the same memory location
+ * that was passed to fetch_arg_next.  */
+void fetch_arg_done(struct fetch_context *context);
+
+/* Called before fetching arguments that come from parameter packs.
+ * Returns 0 on success or a negative value on failure.  */
+int fetch_param_pack_start(struct fetch_context *context,
+			   enum param_pack_flavor ppflavor);
+
+/* Called after a parameter pack has been fetched.  */
+void fetch_param_pack_end(struct fetch_context *context);
+
+
+/* The following callbacks have to be implemented in backend if arch.h
+ * defines ARCH_HAVE_FETCH_ARG.  These backend callbacks correspond to
+ * above functions.  */
+struct fetch_context *arch_fetch_arg_init(enum tof type, struct Process *proc,
+					  struct arg_type_info *ret_info);
+struct fetch_context *arch_fetch_arg_clone(struct Process *proc,
+					   struct fetch_context *context);
+int arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
+			struct Process *proc, struct arg_type_info *info,
+			struct value *valuep);
+int arch_fetch_retval(struct fetch_context *ctx, enum tof type,
+		      struct Process *proc, struct arg_type_info *info,
+		      struct value *valuep);
+void arch_fetch_arg_done(struct fetch_context *context);
+
+/* The following callbacks have to be implemented in backend if arch.h
+ * defines ARCH_HAVE_FETCH_ARG and ARCH_HAVE_FETCH_PACK.  */
+int arch_fetch_param_pack_start(struct fetch_context *context,
+				enum param_pack_flavor ppflavor);
+void arch_fetch_param_pack_end(struct fetch_context *context);
+
+#endif /* FETCH_H */