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Keith Randall 7a427143b6 cmd/compile: stack allocate variable-sized makeslice 
Instead of always allocating variable-sized "make" calls on the heap,
allocate a small, constant-sized array on the stack and use that array
as the backing store if it is big enough.

Requires the result of the "make" doesn't escape.

  if cap <= K {
      var arr [K]E
      slice = arr[:len:cap]
  } else {
      slice = makeslice(E, len, cap)
  }

Pretty conservatively for now, K = 32/sizeof(E). The slice header is
already 24 bytes, so wasting 32 bytes of stack if the requested size
is too big isn't that bad. Larger would waste more stack space but
maybe avoid more allocations.

This CL also requires the element type be pointer-free.  Maybe we
could relax that at some point, but it is hard. If the element type
has pointers we can get heap->stack pointers (in the case where the
requested size is too big and the slice is heap allocated).

Note that this only handles the case of makeslice called directly from
compiler-generated code. It does not handle slices built in the
runtime on behalf of the program (e.g. in growslice). Some of those
are currently handled by passing in a tmpBuf (e.g. concatstrings),
but we could probably do more.

Change-Id: I8378efad527cd00d25948a80b82a68d88fbd93a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/653856
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
 		2025-04-04 10:36:58 -07:00
..
abi test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
alias3.dir
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arenas
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asmhdr.dir
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chan
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closure3.dir cmd/compile: use very high budget for once-called closures 2024-11-22 02:04:41 +00:00
closure5.dir
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codegen cmd/compile: improve store-to-load forwarding with compatible types 2025-04-04 08:25:47 -07:00
ddd2.dir
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dwarf
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fixedbugs cmd/compile: remove implicit deref from len(p) where p is ptr-to-array 2025-03-19 09:55:46 -07:00
import2.dir
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import4.dir
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interface
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internal/runtime/sys runtime: move getcallersp to internal/runtime/sys 2024-09-17 17:01:20 +00:00
intrinsic.dir runtime,internal: move runtime/internal/sys to internal/runtime/sys 2024-07-23 19:05:35 +00:00
ken
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linkname.dir test: compile source files as if from "test" module 2022-03-24 17:50:47 +00:00
linknameasm.dir cmd/compile: generate args_stackmap for ABI0 assembly func regardless of linkname 2024-06-07 15:22:22 +00:00
method4.dir
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retjmp.dir
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stress test/stress: fix typo in comment 2024-03-25 19:21:35 +00:00
syntax cmd/compile: better error message when offending/missing token is a keyword 2024-11-14 02:14:13 +00:00
typeparam cmd/compile: export/import materialized aliases 2024-04-05 16:29:58 +00:00
uintptrescapes.dir
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wasmmemsize.dir test: add a test for wasm memory usage 2024-10-28 13:27:58 +00:00
64bit.go
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235.go
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README.md
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alg.go
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alias.go
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alias1.go
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alias2.go go/types, types2: qualify named types in error messages with type kind 2024-10-23 04:43:01 +00:00
alias3.go
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align.go
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append.go
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append1.go
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args.go
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armimm.go
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asmhdr.go
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assign.go sync: add explicit noCopy fields to Map, Mutex, and Once 2024-11-18 18:52:54 +00:00
assign1.go
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atomicload.go
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bigalg.go
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bigmap.go
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blank.go
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blank1.go
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bom.go
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bombad.go
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bounds.go
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cannotassign.go
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chancap.go
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chanlinear.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
char_lit.go
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char_lit1.go
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checkbce.go cmd/compile: rewrite the constant parts of the prove pass 2024-08-07 16:07:33 +00:00
clear.go
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clearfat.go
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closedchan.go
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closure.go
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closure1.go
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closure2.go
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closure3.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
closure4.go
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closure5.go
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closure6.go
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closure7.go
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cmp.go
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cmp6.go
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cmplx.go
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cmplxdivide.c
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cmplxdivide.go
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cmplxdivide1.go
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complit.go
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complit1.go go/types, types2: report better error messages for slice expressions 2025-03-11 05:44:15 -07:00
compos.go
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const.go
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const1.go
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const2.go
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const3.go
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const4.go
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const5.go
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const6.go
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const7.go
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const8.go
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convT2X.go
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convert.go
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convert1.go
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convert2.go
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convert3.go
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convert4.go
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convinline.go
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convlit.go
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convlit1.go
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copy.go
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copy1.go go/types, types2: better error messages for copy built-in 2025-03-10 21:30:51 -07:00
crlf.go
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ddd.go
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ddd1.go
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ddd2.go
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decl.go
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declbad.go
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defer.go
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defererrcheck.go test: add open-coded defer tests for too many exits path 2024-07-29 14:30:07 +00:00
deferfin.go
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defernil.go
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deferprint.go
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deferprint.out
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devirt.go
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directive.go cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
directive2.go
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divide.go
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divmod.go
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embedfunc.go
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embedvers.go
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empty.go
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env.go
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eof.go
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eof1.go
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escape.go
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escape2.go all: remove newline characters after return statements 2023-12-14 17:22:18 +00:00
escape2n.go all: remove newline characters after return statements 2023-12-14 17:22:18 +00:00
escape3.go
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escape4.go cmd/compile: retire "IsHiddenClosure" and "IsDeadcodeClosure" 2024-07-22 21:27:37 +00:00
escape5.go
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escape_array.go cmd/compile: determine static values of len and cap in make() calls 2025-02-19 13:38:58 -08:00
escape_calls.go cmd/compile: fix escape analysis of string min/max 2023-12-05 22:06:07 +00:00
escape_closure.go cmd/compile: retire "IsHiddenClosure" and "IsDeadcodeClosure" 2024-07-22 21:27:37 +00:00
escape_field.go
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escape_goto.go
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escape_hash_maphash.go
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escape_iface.go
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escape_indir.go
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escape_level.go
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escape_make_non_const.go cmd/compile: stack allocate variable-sized makeslice 2025-04-04 10:36:58 -07:00
escape_map.go
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escape_mutations.go
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escape_param.go
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escape_reflect.go reflect: remove calling mapiterkey, mapiterelem 2024-09-18 20:57:20 +00:00
escape_runtime_atomic.go runtime: migrate internal/atomic to internal/runtime 2024-03-25 19:53:03 +00:00
escape_selfassign.go
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escape_slice.go
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escape_struct_param1.go
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escape_struct_param2.go
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escape_struct_return.go
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escape_sync_atomic.go
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escape_unsafe.go
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fibo.go
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finprofiled.go test: ignore MemProfileRecords with no live objects in finprofiled.go 2023-11-16 05:48:00 +00:00
float_lit.go
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float_lit2.go
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float_lit3.go
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floatcmp.go
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for.go
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func.go
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func1.go
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func2.go
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func3.go go/parser, syntax: better error message for parameter missing type 2024-09-30 22:04:40 +00:00
func4.go
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func5.go
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func6.go
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func7.go
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func8.go
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funcdup.go
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funcdup2.go
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fuse.go cmd/compile: handle boolean and pointer relations 2024-08-07 16:07:55 +00:00
gc.go
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gc1.go
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gc2.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
gcgort.go
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gcstring.go
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goprint.go
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goprint.out
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goto.go
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heapsampling.go
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helloworld.go
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helloworld.out
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if.go
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import.go
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import1.go
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import2.go
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import4.go
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import5.go
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import6.go
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index.go
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index0.go
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index1.go
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index2.go
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indirect.go
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indirect1.go
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init.go
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init1.go
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initcomma.go
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initexp.go
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initialize.go
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initializerr.go
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initloop.go go/types: improve recursive type error message 2024-10-22 22:20:29 +00:00
inline.go cmd/compile: remove no-longer-necessary recursive inlining checks 2025-03-06 10:07:17 -08:00
inline_big.go
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inline_caller.go
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inline_callers.go
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inline_endian.go
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inline_literal.go
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inline_math_bits_rotate.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
inline_sync.go sync: use atomic.Uint32 in Once 2023-10-06 21:01:50 +00:00
inline_testingbloop.go testing: detect a stopped timer in B.Loop 2025-03-24 11:41:09 -07:00
inline_variadic.go
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int_lit.go
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intcvt.go
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intrinsic.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
intrinsic_atomic.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
iota.go
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label.go
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label1.go
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linkmain.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
linkmain_run.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
linkname.go
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linkname3.go cmd/compile: disallow linkname referring to instantiations 2024-05-15 19:27:25 +00:00
linknameasm.go cmd/compile: generate args_stackmap for ABI0 assembly func regardless of linkname 2024-06-07 15:22:22 +00:00
linkobj.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
linkx.go
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linkx_run.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
literal.go
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literal2.go
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live.go runtime: rename mapiterinit and mapiternext 2025-01-28 10:54:43 -08:00
live1.go
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live2.go cmd/compile,internal/runtime/maps: add extendible hashing 2024-10-21 14:16:20 +00:00
live_regabi.go runtime: rename mapiterinit and mapiternext 2025-01-28 10:54:43 -08:00
live_uintptrkeepalive.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
loopbce.go cmd/compile: remove no-longer-necessary recursive inlining checks 2025-03-06 10:07:17 -08:00
mainsig.go
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makechan.go all: fix some comments 2024-04-04 14:29:45 +00:00
makemap.go
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makenew.go
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makeslice.go
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mallocfin.go
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map.go
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map1.go
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mapclear.go
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maplinear.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
maymorestack.go
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mergemul.go
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method.go
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method1.go
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method2.go
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method3.go
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method4.go
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method5.go
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method6.go
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method7.go
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named.go
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named1.go
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newinline.go cmd/compile: remove no-longer-necessary recursive inlining checks 2025-03-06 10:07:17 -08:00
nil.go
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nilcheck.go
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nilptr.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr2.go
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nilptr3.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr4.go
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nilptr5.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr5_aix.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr5_wasm.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr_aix.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
noinit.go
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nosplit.go cmd/internal/objabi, internal/runtime: increase nosplit limit on OpenBSD 2024-12-06 00:35:41 +00:00
nowritebarrier.go
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nul1.go
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opt_branchlikely.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
parentype.go
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peano.go
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phiopt.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
print.go
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print.out
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printbig.go
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printbig.out
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prove.go cmd/compile: use min & max builtins to assert constant bounds in prove's tests 2025-03-11 19:51:59 -07:00
prove_constant_folding.go cmd/compile: rewrite the constant parts of the prove pass 2024-08-07 16:07:33 +00:00
prove_invert_loop_with_unused_iterators.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
prove_popcount.go cmd/compile: compute bits.OnesCount's limits from argument's limits 2025-03-11 20:17:36 -07:00
range.go
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range2.go all: rename GOEXPERIMENT=range to rangefunc 2023-11-08 15:32:14 +00:00
range3.go cmd/compile: fix typecheck range over rune literal 2023-12-01 17:20:08 +00:00
range4.go cmd/compile: handle defined iter func type correctly 2024-01-08 16:00:53 +00:00
rangegen.go test: skip rangegen.go on 32-bit platforms 2023-12-18 23:35:19 +00:00
recover.go
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recover1.go
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recover2.go
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recover3.go
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recover4.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
recover5.go
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reflectmethod1.go
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reflectmethod2.go
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reflectmethod3.go
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reflectmethod4.go
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reflectmethod5.go
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reflectmethod6.go
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reflectmethod7.go
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reflectmethod8.go
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rename.go
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rename1.go
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reorder.go
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reorder2.go
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retjmp.go
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return.go
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rotate.go
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rotate0.go
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rotate1.go
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rotate2.go
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rotate3.go
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rune.go
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runtime.go
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shift1.go
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shift2.go
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shift3.go
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sieve.go
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sigchld.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
sigchld.out
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simassign.go
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sizeof.go
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slice3.go
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slice3err.go
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slicecap.go
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sliceopt.go
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solitaire.go
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stack.go
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stackobj.go
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stackobj2.go
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stackobj3.go
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strcopy.go
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strength.go
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string_lit.go
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stringrange.go
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struct0.go
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switch.go
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switch2.go cmd/compile: better error message when offending/missing token is a keyword 2024-11-14 02:14:13 +00:00
switch3.go
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switch4.go
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switch5.go
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switch6.go
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switch7.go
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tailcall.go cmd/compile: Enable inlining of tail calls 2025-03-11 14:18:43 -07:00
tighten.go cmd/compile: pair loads and stores on arm64 2025-02-13 14:07:47 -08:00
tinyfin.go
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torture.go
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turing.go
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typecheck.go
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typecheckloop.go
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typeswitch.go
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typeswitch1.go
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typeswitch2.go
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typeswitch2b.go
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typeswitch3.go
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uintptrescapes.go
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uintptrescapes2.go
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uintptrescapes3.go
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uintptrkeepalive.go
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undef.go
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unsafe_slice_data.go
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unsafe_string.go
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unsafe_string_data.go
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unsafebuiltins.go
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used.go
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utf.go
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varerr.go
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varinit.go
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wasmexport.go cmd/compile: add basic wasmexport support 2024-08-09 20:07:54 +00:00
wasmexport2.go cmd/compile: allow more types for wasmimport/wasmexport parameters and results 2024-11-11 17:11:50 +00:00
wasmmemsize.go test: add a test for wasm memory usage 2024-10-28 13:27:58 +00:00
weak.go weak: prevent unsafe conversions using weak pointers 2025-02-06 13:16:59 -08:00
winbatch.go
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writebarrier.go
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zerodivide.go
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zerosize.go
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README.md

The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.

To run just these tests, execute:

../bin/go test cmd/internal/testdir

To run just tests from specified files in this directory, execute:

../bin/go test cmd/internal/testdir -run='Test/(file1.go|file2.go|...)'

Standard library tests should be written as regular Go tests in the appropriate package.

The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:

  • it is most naturally expressed using the test runner; or
  • it is also applicable to gccgo and other Go tool chains.