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Keith Randall 66197f01e1 [release-branch.go1.18] cmd/compile: handle partially overlapping assignments 
Normally, when moving Go values of type T from one location to another,
we don't need to worry about partial overlaps. The two Ts must either be
in disjoint (nonoverlapping) memory or in exactly the same location.
There are 2 cases where this isn't true:
 1) Using unsafe you can arrange partial overlaps.
 2) Since Go 1.17, you can use a cast from a slice to a ptr-to-array.
    https://go.dev/ref/spec#Conversions_from_slice_to_array_pointer
    This feature can be used to construct partial overlaps of array types.
      var a [3]int
      p := (*[2]int)(a[:])
      q := (*[2]int)(a[1:])
      *p = *q
We don't care about solving 1. Or at least, we haven't historically
and no one has complained.
For 2, we need to ensure that if there might be partial overlap,
then we can't use OpMove; we must use memmove instead.
(memmove handles partial overlap by copying in the correct
direction. OpMove does not.)

Note that we have to be careful here not to introduce a call when
we're marshaling arguments to a call or unmarshaling results from a call.

Fixes #54603

Change-Id: I1ca6aba8041576849c1d85f1fa33ae61b80a373d
Reviewed-on: https://go-review.googlesource.com/c/go/+/425076
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
(cherry picked from commit 332a5981d0)
Reviewed-on: https://go-review.googlesource.com/c/go/+/425198
 		2022-08-29 19:12:46 +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
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chan
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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: handle partially overlapping assignments 2022-08-29 19:12:46 +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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typeparam [release-branch.go1.18] cmd/compile: revert "fix missing dict pass for type assertions" 2022-07-27 16:55:10 +00:00
uintptrescapes.dir
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64bit.go
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README.md
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alg.go
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alias.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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ddd1.go cmd/compile: match Go 1.17 compiler error messages more closely 2021-11-12 23:07:01 +00:00
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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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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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goto.go
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heapsampling.go
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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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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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linkmain.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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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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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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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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nosplit.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
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reflectmethod7.go all: use reflect.{Pointer,PointerTo} 2021-10-26 14:24:17 +00:00
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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
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shift1.go test: re-enable a bunch of tests with types2 2021-12-03 16:24:32 +00:00
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switch6.go cmd/compile, types2: better error message for invalid type assertion 2021-10-19 17:01:35 +00:00
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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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typeswitch3.go cmd/compile/internal/types2: better error for type assertion/switch on type parameter value 2021-11-12 22:20:51 +00:00
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unsafebuiltins.go unsafe: allow unsafe.Slice up to end of address space 2021-10-13 18:15:16 +00:00
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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.