runtime: cleanup: use ArgsSizeUnknown to mark all functions

whose argument size is unknown (C vararg functions, and
assembly code without an explicit specification).

We used to use 0 to mean "unknown" and 1 to mean "zero".
Now we use ArgsSizeUnknown (0x80000000) to mean "unknown".

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/11590043

4 files changed, 8 insertions, 6 deletions

diff --git a/src/pkg/runtime/funcdata.h b/src/pkg/runtime/funcdata.h
index 8fcadcb611..850288bf64 100644
--- a/src/pkg/runtime/funcdata.h
+++ b/src/pkg/runtime/funcdata.h
@@ -11,3 +11,9 @@
 
 // To be used in assembly.
 #define ARGSIZE(n) PCDATA $PCDATA_ArgSize, $n
+
+// 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
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 3a11f88954..811ec76653 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -148,12 +148,6 @@ enum
 	// Global <-> per-M stack segment cache transfer batch size.
 	StackCacheBatch = 16,
 };
-enum
-{
-	// This value is generated by the linker and should be kept in
-	// sync with cmd/ld/lib.h
-	ArgsSizeUnknown = 0x80000000,
-};
 /*
  * structures
  */
diff --git a/src/pkg/runtime/traceback_arm.c b/src/pkg/runtime/traceback_arm.c
index 73ae2225bb..5aea699e34 100644
--- a/src/pkg/runtime/traceback_arm.c
+++ b/src/pkg/runtime/traceback_arm.c
@@ -5,6 +5,7 @@
 #include "runtime.h"
 #include "arch_GOARCH.h"
 #include "malloc.h"
+#include "funcdata.h"
 
 void runtime·sigpanic(void);
 
diff --git a/src/pkg/runtime/traceback_x86.c b/src/pkg/runtime/traceback_x86.c
index 10f69c47ec..3153103d34 100644
--- a/src/pkg/runtime/traceback_x86.c
+++ b/src/pkg/runtime/traceback_x86.c
@@ -7,6 +7,7 @@
 #include "runtime.h"
 #include "arch_GOARCH.h"
 #include "malloc.h"
+#include "funcdata.h"
 
 void runtime·deferproc(void);
 void runtime·newproc(void);