diff options
| -rw-r--r-- | src/go/build/deps_test.go | 4 | ||||
| -rw-r--r-- | src/internal/abi/abi.go | 12 | ||||
| -rw-r--r-- | src/internal/abi/abi_amd64.go | 20 | ||||
| -rw-r--r-- | src/internal/abi/abi_generic.go | 38 |
4 files changed, 72 insertions, 2 deletions
diff --git a/src/go/build/deps_test.go b/src/go/build/deps_test.go index c97c668cc4..02b29f498a 100644 --- a/src/go/build/deps_test.go +++ b/src/go/build/deps_test.go @@ -71,13 +71,13 @@ var depsRules = ` # No dependencies allowed for any of these packages. NONE < container/list, container/ring, - internal/cfg, internal/cpu, + internal/abi, internal/cfg, internal/cpu, internal/goversion, internal/nettrace, unicode/utf8, unicode/utf16, unicode, unsafe; # RUNTIME is the core runtime group of packages, all of them very light-weight. - internal/cpu, unsafe + internal/abi, internal/cpu, unsafe < internal/bytealg < internal/unsafeheader < runtime/internal/sys diff --git a/src/internal/abi/abi.go b/src/internal/abi/abi.go new file mode 100644 index 0000000000..07ea51df8f --- /dev/null +++ b/src/internal/abi/abi.go @@ -0,0 +1,12 @@ +// Copyright 2020 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. + +package abi + +// RegArgs is a struct that has space for each argument +// and return value register on the current architecture. +type RegArgs struct { + Ints [IntArgRegs]uintptr + Floats [FloatArgRegs]uint64 +} diff --git a/src/internal/abi/abi_amd64.go b/src/internal/abi/abi_amd64.go new file mode 100644 index 0000000000..6574d4216d --- /dev/null +++ b/src/internal/abi/abi_amd64.go @@ -0,0 +1,20 @@ +// Copyright 2020 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. + +// +build goexperiment.regabi + +package abi + +const ( + // See abi_generic.go. + + // RAX, RBX, RCX, RDI, RSI, R8, R9, R10, R11. + IntArgRegs = 9 + + // X0 -> X14. + FloatArgRegs = 15 + + // We use SSE2 registers which support 64-bit float operations. + EffectiveFloatRegSize = 8 +) diff --git a/src/internal/abi/abi_generic.go b/src/internal/abi/abi_generic.go new file mode 100644 index 0000000000..5ef9883dc6 --- /dev/null +++ b/src/internal/abi/abi_generic.go @@ -0,0 +1,38 @@ +// Copyright 2020 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. + +// +build !goexperiment.regabi + +package abi + +const ( + // ABI-related constants. + // + // In the generic case, these are all zero + // which lets them gracefully degrade to ABI0. + + // IntArgRegs is the number of registers dedicated + // to passing integer argument values. Result registers are identical + // to argument registers, so this number is used for those too. + IntArgRegs = 0 + + // FloatArgRegs is the number of registers dedicated + // to passing floating-point argument values. Result registers are + // identical to argument registers, so this number is used for + // those too. + FloatArgRegs = 0 + + // EffectiveFloatRegSize describes the width of floating point + // registers on the current platform from the ABI's perspective. + // + // Since Go only supports 32-bit and 64-bit floating point primitives, + // this number should be either 0, 4, or 8. 0 indicates no floating + // point registers for the ABI or that floating point values will be + // passed via the softfloat ABI. + // + // For platforms that support larger floating point register widths, + // such as x87's 80-bit "registers" (not that we support x87 currently), + // use 8. + EffectiveFloatRegSize = 0 +) |