diff options
| author | Austin Clements <austin@google.com> | 2017-01-13 15:32:53 -0500 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2017-02-07 18:39:12 +0000 |
| commit | efb5eae3cf1c5f9be8cc5d4c85a7314204513b4c (patch) | |
| tree | f1efae1fe7ebcd59c38421d3018f33f8ed765d95 /src/runtime/malloc.go | |
| parent | 46085c4b3620fb3be29ea6ecc6206ffdb963f8bf (diff) | |
| download | go-efb5eae3cf1c5f9be8cc5d4c85a7314204513b4c.tar.xz | |
runtime: make _MaxMem an untyped constant
Currently _MaxMem is a uintptr, which is going to complicate some
further changes. Make it untyped so we'll be able to do untyped math
on it before truncating it to a uintptr.
The runtime assembly is identical before and after this change on
{linux,windows}/{amd64,386}.
Updates #18651.
Change-Id: I0f64511faa9e0aa25179a556ab9f185ebf8c9cf8
Reviewed-on: https://go-review.googlesource.com/35251
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Diffstat (limited to 'src/runtime/malloc.go')
| -rw-r--r-- | src/runtime/malloc.go | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go index da39dac510..37e6b4b2ef 100644 --- a/src/runtime/malloc.go +++ b/src/runtime/malloc.go @@ -148,7 +148,11 @@ const ( _MHeapMap_TotalBits = (_64bit*sys.GoosWindows)*35 + (_64bit*(1-sys.GoosWindows)*(1-sys.GoosDarwin*sys.GoarchArm64))*39 + sys.GoosDarwin*sys.GoarchArm64*31 + (1-_64bit)*(32-(sys.GoarchMips+sys.GoarchMipsle)) _MHeapMap_Bits = _MHeapMap_TotalBits - _PageShift - _MaxMem = uintptr(1<<_MHeapMap_TotalBits - 1) + // _MaxMem is the maximum heap arena size minus 1. + // + // On 32-bit, this is also the maximum heap pointer value, + // since the arena starts at address 0. + _MaxMem = 1<<_MHeapMap_TotalBits - 1 // Max number of threads to run garbage collection. // 2, 3, and 4 are all plausible maximums depending |