Imported Upstream version 60

1 files changed, 0 insertions, 96 deletions

diff --git a/src/pkg/runtime/stack.h b/src/pkg/runtime/stack.h
deleted file mode 100644
index 2b6b0e387..000000000
--- a/src/pkg/runtime/stack.h
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2011 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.
-
-/*
-Stack layout parameters.
-Included both by runtime (compiled via 6c) and linkers (compiled via gcc).
-
-The per-goroutine g->stackguard is set to point StackGuard bytes
-above the bottom of the stack.  Each function compares its stack
-pointer against g->stackguard to check for overflow.  To cut one
-instruction from the check sequence for functions with tiny frames,
-the stack is allowed to protrude StackSmall bytes below the stack
-guard.  Functions with large frames don't bother with the check and
-always call morestack.  The sequences are (for amd64, others are
-similar):
- 
-	guard = g->stackguard
-	frame = function's stack frame size
-	argsize = size of function arguments (call + return)
-
-	stack frame size <= StackSmall:
-		CMPQ guard, SP
-		JHI 3(PC)
-		MOVQ m->morearg, $(argsize << 32)
-		CALL morestack(SB)
-
-	stack frame size > StackSmall but < StackBig
-		LEAQ (frame-StackSmall)(SP), R0
-		CMPQ guard, R0
-		JHI 3(PC)
-		MOVQ m->morearg, $(argsize << 32)
-		CALL morestack(SB)
-
-	stack frame size >= StackBig:
-		MOVQ m->morearg, $((argsize << 32) | frame)
-		CALL morestack(SB)
-
-The bottom StackGuard - StackSmall bytes are important: there has
-to be enough room to execute functions that refuse to check for
-stack overflow, either because they need to be adjacent to the
-actual caller's frame (deferproc) or because they handle the imminent
-stack overflow (morestack).
-
-For example, deferproc might call malloc, which does one of the
-above checks (without allocating a full frame), which might trigger
-a call to morestack.  This sequence needs to fit in the bottom
-section of the stack.  On amd64, morestack's frame is 40 bytes, and
-deferproc's frame is 56 bytes.  That fits well within the
-StackGuard - StackSmall = 128 bytes at the bottom.  
-The linkers explore all possible call traces involving non-splitting
-functions to make sure that this limit cannot be violated.
- */
-
-enum {
-	// StackSystem is a number of additional bytes to add
-	// to each stack below the usual guard area for OS-specific
-	// purposes like signal handling. Used on Windows because
-	// it does not use a separate stack.
-#ifdef __WINDOWS__
-	StackSystem = 2048,
-#else
-	StackSystem = 0,
-#endif
-
-	// The amount of extra stack to allocate beyond the size
-	// needed for the single frame that triggered the split.
-	StackExtra = 1024,
-
-	// The minimum stack segment size to allocate.
-	// If the amount needed for the splitting frame + StackExtra
-	// is less than this number, the stack will have this size instead.
-	StackMin = 4096,
-
-	// Functions that need frames bigger than this call morestack
-	// unconditionally.  That is, on entry to a function it is assumed
-	// that the amount of space available in the current stack segment
-	// couldn't possibly be bigger than StackBig.  If stack segments
-	// do run with more space than StackBig, the space may not be
-	// used efficiently.  As a result, StackBig should not be significantly
-	// smaller than StackMin or StackExtra.
-	StackBig = 4096,
-
-	// The stack guard is a pointer this many bytes above the
-	// bottom of the stack.
-	StackGuard = 256 + StackSystem,
-
-	// After a stack split check the SP is allowed to be this
-	// many bytes below the stack guard.  This saves an instruction
-	// in the checking sequence for tiny frames.
-	StackSmall = 128,
-
-	// The maximum number of bytes that a chain of NOSPLIT
-	// functions can use.
-	StackLimit = StackGuard - StackSystem - StackSmall,
-};