runtime: use funcdata to supply garbage collection information
This CL introduces a FUNCDATA number for runtime-specific
garbage collection metadata, changes the C and Go compilers
to emit that metadata, and changes the runtime to expect it.
The old pseudo-instructions that carried this information
are gone, as is the linker code to process them.
R=golang-dev, dvyukov, cshapiro
CC=golang-dev
https://golang.org/cl/11406044
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 811ec76..f405287 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -407,10 +407,10 @@
// TODO: Remove these fields.
int32 args; // in/out args size
- int32 locals; // locals size
+ int32 x1; // locals size
int32 frame; // legacy frame size; use pcsp if possible
- int32 ptrsoff;
- int32 ptrslen;
+ int32 x2;
+ int32 x3;
int32 pcsp;
int32 pcfile;
@@ -677,10 +677,9 @@
uintptr lr; // program counter at caller aka link register
uintptr sp; // stack pointer at pc
uintptr fp; // stack pointer at caller aka frame pointer
+ byte* varp; // top of local variables
byte* argp; // pointer to function arguments
uintptr arglen; // number of bytes at argp
- byte* varp; // pointer to local variables
- uintptr varlen; // number of bytes at varp
};
int32 runtime·gentraceback(uintptr, uintptr, uintptr, G*, int32, uintptr*, int32, void(*)(Stkframe*, void*), void*, bool);
@@ -856,6 +855,7 @@
void runtime·crash(void);
void runtime·parsedebugvars(void);
void _rt0_go(void);
+void* runtime·funcdata(Func*, int32);
#pragma varargck argpos runtime·printf 1
#pragma varargck type "c" int32
