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Keith Randall e0a364b061 [release-branch.go1.18] cmd/compile: avoid using destination pointer base type in memmove optimization 
The type of the source and destination of a memmove call isn't
always accurate. It will always be a pointer (or an unsafe.Pointer), but
the base type might not be accurate. This comes about because multiple
copies of a pointer with different base types are coalesced into a single value.

In the failing example, the IData selector of the input argument is a
*[32]byte in one branch of the type switch, and a *[]byte in the other branch.
During the expand_calls pass both IDatas become just copies of the input
register. Those copies are deduped and an arbitrary one wins (in this case,
*[]byte is the unfortunate winner).

Generally an op v can rely on v.Type during rewrite rules. But relying
on v.Args[i].Type is discouraged.

Fixes #55151

Change-Id: I348fd9accf2058a87cd191eec01d39cda612f120
Reviewed-on: https://go-review.googlesource.com/c/go/+/431496
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
(cherry picked from commit e283473ebb)
Reviewed-on: https://go-review.googlesource.com/c/go/+/431918
 		2022-09-21 20:24:17 +00:00
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abi cmd/compile: restore tail call for method wrappers 2021-09-17 22:59:44 +00:00
alias3.dir
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asmhdr.dir cmd/compile: use exact constant in go_asm.h 2022-01-10 21:27:19 +00:00
bench test/bench/go1: fix size for RegexpMatchMedium_32 2021-07-18 21:03:43 +00:00
chan [dev.typeparams] cmd/compile/internal/types2: implement close(ch) where ch is of type parameter type 2021-07-14 23:33:46 +00:00
closure3.dir cmd/compile/internal/inline: revise closure inl position fix 2021-11-24 15:55:56 +00:00
closure5.dir
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codegen test/codegen: updated arithmetic tests to verify on ppc64,ppc64le 2021-11-01 13:12:37 +00:00
ddd2.dir
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dwarf
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fixedbugs [release-branch.go1.18] cmd/compile: avoid using destination pointer base type in memmove optimization 2022-09-21 20:24:17 +00:00
import2.dir
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import4.dir
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interface cmd/compile: match Go 1.17 compiler error messages more closely 2021-11-12 23:07:01 +00:00
intrinsic.dir
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ken test/ken/slicearray.go: correct type width in comment 2021-12-05 12:50:44 +00:00
linkname.dir cmd/compile: allow inlining of ORANGE 2021-10-28 14:25:03 +00:00
method4.dir
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oldescape_linkname.dir
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retjmp.dir cmd/internal/obj: fix tail call in non-zero frame leaf function on MIPS and S390X 2021-12-13 22:42:08 +00:00
runtime
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stress
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syntax
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typeparam [release-branch.go1.18] cmd/compile/internal/inline: fix latent CalleeEffects issue 2022-09-19 21:52:38 +00:00
uintptrescapes.dir
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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 cmd/compile: match Go 1.17 compiler error messages more closely 2021-11-12 23:07:01 +00:00
alias3.go
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align.go
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append.go
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append1.go cmd/compile: match Go 1.17 compiler error messages more closely 2021-11-12 23:07:01 +00:00
args.go
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armimm.go
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asmhdr.go cmd/compile: emit sensible go_asm.h consts for big ints 2021-10-30 18:30:05 +00:00
assign.go
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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
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char_lit.go
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char_lit1.go
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checkbce.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
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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
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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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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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convlit.go
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convlit1.go
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copy.go
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copy1.go
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crlf.go
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ddd.go
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ddd1.go cmd/compile: match Go 1.17 compiler error messages more closely 2021-11-12 23:07:01 +00:00
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
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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 [dev.typeparams] cmd/compile: simplify interface conversions 2021-08-09 16:10:20 +00:00
directive.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
directive2.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
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
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escape2n.go
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escape3.go
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escape4.go
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escape5.go [dev.typeparams] test: rename blank functions 2021-07-28 21:41:07 +00:00
escape_array.go
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escape_calls.go
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escape_closure.go
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escape_field.go
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escape_goto.go [dev.typeparams] test: rename blank functions 2021-07-28 21:41:07 +00:00
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_map.go
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escape_param.go
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escape_runtime_atomic.go
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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
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float_lit.go
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float_lit2.go
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float_lit3.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
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
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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
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gc.go
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gc1.go
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gc2.go
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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 test: re-enable most go/tests that were disabled because of types2 differences 2022-01-11 02:26:58 +00:00
import2.go
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import4.go
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import5.go
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import6.go test: re-enable most go/tests that were disabled because of types2 differences 2022-01-11 02:26:58 +00:00
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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initempty.go
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initexp.go
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initialize.go
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initializerr.go test: re-enable most go/tests that were disabled because of types2 differences 2022-01-11 02:26:58 +00:00
initloop.go
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inline.go cmd/compile/internal/inline: revise closure inl position fix 2021-11-24 15:55:56 +00:00
inline_big.go
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inline_caller.go
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inline_callers.go
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inline_endian.go test: skip endian inlining test on noopt builder 2021-10-07 00:39:17 +00:00
inline_literal.go
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inline_math_bits_rotate.go
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inline_sync.go
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inline_variadic.go
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int_lit.go
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intcvt.go
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intrinsic.go
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intrinsic_atomic.go
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iota.go
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label.go
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label1.go
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linkmain.go
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linkmain_run.go
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linkname.go
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linkname2.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
linkname3.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
linkobj.go
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linkx.go
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linkx_run.go
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literal.go
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literal2.go
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live.go [dev.typeparams] cmd/compile: simplify interface conversions 2021-08-09 16:10:20 +00:00
live1.go
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live2.go
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live_regabi.go test: enable regabi test on arm64 2021-08-20 19:58:13 +00:00
live_syscall.go
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locklinear.go
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loopbce.go
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mainsig.go
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makechan.go
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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
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maymorestack.go cmd/{asm,compile,internal/obj}: add "maymorestack" support 2021-11-05 00:52:06 +00:00
mergemul.go
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method.go
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method1.go
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method2.go go/types, types2: better error message when using *interface instead of interface 2022-01-10 22:48:40 +00:00
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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nil.go
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nilcheck.go
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nilptr.go
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nilptr2.go
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nilptr3.go
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nilptr4.go
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nilptr5.go [release-branch.go1.18] cmd/compile: handle partially overlapping assignments 2022-08-29 19:12:46 +00:00
nilptr5_aix.go
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nilptr5_wasm.go
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nilptr_aix.go
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nosplit.go
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notinheap.go
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notinheap2.go
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notinheap3.go
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nowritebarrier.go
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nul1.go
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opt_branchlikely.go
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parentype.go
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peano.go
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phiopt.go
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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
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recover.go
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recover1.go
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recover4.go test/recover4.go: use mprotect to create a hole instead of munmap 2021-11-12 16:58:34 +00:00
recover5.go
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reflectmethod1.go
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reflectmethod2.go
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reflectmethod5.go
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reflectmethod6.go
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reflectmethod7.go all: use reflect.{Pointer,PointerTo} 2021-10-26 14:24:17 +00:00
reflectmethod8.go [dev.typeparams] cmd/compile: fix missing condition in usemethod 2021-07-22 17:48:41 +00:00
rename.go
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run.go [release-branch.go1.18] go/types,types2: delay the check for conflicting struct field names 2022-05-09 20:14:33 +00:00
rune.go
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runtime.go
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shift1.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
shift2.go
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sieve.go
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sigchld.go
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sigchld.out
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simassign.go
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sizeof.go
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solitaire.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
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switch3.go
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switch4.go
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switch5.go
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switch6.go cmd/compile, types2: better error message for invalid type assertion 2021-10-19 17:01:35 +00:00
switch7.go
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tinyfin.go
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torture.go
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turing.go
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typecheck.go test: re-enable most go/tests that were disabled because of types2 differences 2022-01-11 02:26:58 +00:00
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 cmd/compile/internal/types2: better error for type assertion/switch on type parameter value 2021-11-12 22:20:51 +00:00
uintptrescapes.go
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uintptrescapes2.go
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uintptrescapes3.go
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undef.go
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unsafebuiltins.go unsafe: allow unsafe.Slice up to end of address space 2021-10-13 18:15:16 +00:00
used.go
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utf.go
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varerr.go
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varinit.go
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winbatch.go
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writebarrier.go cmd/compile: don't emit write barriers for offsets of global addresses 2021-08-23 19:46:36 +00:00
zerodivide.go all: use bytes.Cut, strings.Cut 2021-10-06 15:53:04 +00:00

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 run run.go

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

../bin/go run run.go -- 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.