Imported Upstream version 1.4upstream/1.4

1 files changed, 60 insertions, 0 deletions

diff --git a/src/runtime/funcdata.h b/src/runtime/funcdata.h
new file mode 100644
index 000000000..d6c14fcb4
--- /dev/null
+++ b/src/runtime/funcdata.h
@@ -0,0 +1,60 @@
+// Copyright 2013 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file defines the IDs for PCDATA and FUNCDATA instructions
+// in Go binaries. It is included by both C and assembly, so it must
+// be written using #defines. It is included by the runtime package
+// as well as the compilers.
+//
+// symtab.go also contains a copy of these constants.
+
+#define PCDATA_StackMapIndex 0
+
+#define FUNCDATA_ArgsPointerMaps 0 /* garbage collector blocks */
+#define FUNCDATA_LocalsPointerMaps 1
+#define FUNCDATA_DeadValueMaps 2
+
+// Pseudo-assembly statements.
+
+// GO_ARGS, GO_RESULTS_INITIALIZED, and NO_LOCAL_POINTERS are macros
+// that communicate to the runtime information about the location and liveness
+// of pointers in an assembly function's arguments, results, and stack frame.
+// This communication is only required in assembly functions that make calls
+// to other functions that might be preempted or grow the stack.
+// NOSPLIT functions that make no calls do not need to use these macros.
+
+// GO_ARGS indicates that the Go prototype for this assembly function
+// defines the pointer map for the function's arguments.
+// GO_ARGS should be the first instruction in a function that uses it.
+// It can be omitted if there are no arguments at all.
+// GO_ARGS is inserted implicitly by the linker for any function
+// that also has a Go prototype and therefore is usually not necessary
+// to write explicitly.
+#define GO_ARGS	FUNCDATA $FUNCDATA_ArgsPointerMaps, go_args_stackmap(SB)
+
+// GO_RESULTS_INITIALIZED indicates that the assembly function
+// has initialized the stack space for its results and that those results
+// should be considered live for the remainder of the function.
+#define GO_RESULTS_INITIALIZED	FUNCDATA PCDATA $PCDATA_StackMapIndex, 1
+
+// NO_LOCAL_POINTERS indicates that the assembly function stores
+// no pointers to heap objects in its local stack variables.
+#define NO_LOCAL_POINTERS	FUNCDATA $FUNCDATA_LocalsPointerMaps, runtime·no_pointers_stackmap(SB)
+
+// ArgsSizeUnknown is set in Func.argsize to mark all functions
+// whose argument size is unknown (C vararg functions, and
+// assembly code without an explicit specification).
+// This value is generated by the compiler, assembler, or linker.
+#define ArgsSizeUnknown 0x80000000
+
+/*c2go
+enum {
+	PCDATA_ArgSize = 0,
+	PCDATA_StackMapIndex = 1,
+	FUNCDATA_ArgsPointerMaps = 0,
+	FUNCDATA_LocalsPointerMaps = 1,
+	FUNCDATA_DeadValueMaps = 2,
+	ArgsSizeUnknown = 0x80000000,
+};
+*/