The routine that adds an automatic to the stack was
adding ptrsize-1 to the size before rounding up.
That addition would only make sense to turn a round down
into a round up. Before a round up, it just wastes a word.
The effect was that a 6c function with one local and
one two-word function call used (8+8)+(16+8) = 40 bytes
instead of 8+16 = 24 bytes.
The wasted space mostly didn't matter, but one place where
it does matter is when trying to stay within the 128-byte
total frame constraint for #pragma textflag 7 functions.
This only affects the C compilers, not the Go compilers.
5c already had correct code, which is now copied to 6c and 8c.
R=ken2
CC=golang-dev
https://golang.org/cl/7303099
This works with at least one version of clang
that existed at one moment in time.
No guarantees about clangs past or future.
To try:
CC=clang all.bash
It does not work with the Xcode clang,
because that clang fails at printing a useful answer
to:
clang -print-libgcc-file-name
The clang that works prints a full path name for
that command, not just "libgcc.a".
Fixes#4713.
R=iant, minux.ma
CC=golang-dev
https://golang.org/cl/7323068
To make sure that Go code will work when moved to a
system with a case-insensitive file system, like OS X or Windows,
reject any package built from files with names differing
only in case, and also any package built from imported
dependencies with names differing only in case.
Fixes#4773.
R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7314104
This fixes a regression introduced in changeset 98034d036d03
which added support for producing host object files.
R=rsc, minux.ma
CC=dave, golang-dev
https://golang.org/cl/7307107
- use the new AllErrors flag where appropriate
- unless AllErrors is set, eliminate spurious
errors before they are added to the errors list
(it turns out that reporting spurious errors always
leads to too many uninformative errors after all)
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7323065
The IgnoredGoFiles are already listed in allgofiles,
so they were being run twice. Worse, the ones in
IgnoredGoFiles are not fully qualified paths, so they
weren't being found when executed outside the
package directory.
Fixes#4764.
R=golang-dev, minux.ma, franciscossouza
CC=golang-dev
https://golang.org/cl/7308049
Simplify the internal logic for flags controlling what to vet,
by introducing a map of flags that gathers them all together.
This change should simplify the process of adding further flags.
Add a test for untagged struct literals.
Delete a redundant test that was also in the wrong file.
Clean up some ERROR patterns that weren't working.
"make test" passes again.
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7305075
Plan 9 compilers insist this but as we don't have Plan 9
builders, we'd better let gcc check the prototypes.
Inspired by CL 7289050.
R=golang-dev, seed, dave, rsc, lucio.dere
CC=akumar, golang-dev
https://golang.org/cl/7288056
A new comment directive //go:noescape instructs the compiler
that the following external (no body) func declaration should be
treated as if none of its arguments escape to the heap.
Fixes#4099.
R=golang-dev, dave, minux.ma, daniel.morsing, remyoudompheng, adg, agl, iant
CC=golang-dev
https://golang.org/cl/7289048
If the analysis reached a node twice, then the analysis was cut off.
However, if the second arrival is at a lower depth (closer to escaping)
then it is important to repeat the traversal.
The repeating must be cut off at some point to avoid the occasional
infinite recursion. This CL cuts it off as soon as possible while still
passing all tests.
Fixes#4751.
R=ken2
CC=golang-dev, lvd
https://golang.org/cl/7303043
Was not re-walking the new AND node, so that its ullman
count was wrong, so that the code generator attempted to
store values in registers across the call.
Fixes#4752.
R=ken2
CC=golang-dev
https://golang.org/cl/7288054
In cmd/go's 'go help testflag':
* Rewrite list of flags to drop test. prefix on every name.
* Sort list of flags.
* Add example of using -bench to match all benchmarks.
In testing:
* Remove mention of undefined 'CPU group' concept.
Fixes#4488.
Fixes#4508.
R=adg
CC=golang-dev
https://golang.org/cl/7288053
* Avoid treating CALL fn(SB) as justification for introducing
and tracking a registerized variable for fn(SB).
* Remove USED(n) after declaration and zeroing of n.
It was left over from when the compiler emitted more
aggressive set and not used errors, and it was keeping
the optimizer from removing a redundant zeroing of n
when n was a pointer or integer variable.
Update #597.
R=ken2
CC=golang-dev
https://golang.org/cl/7277048
It accepts all the build flags.
Say that instead of making a copy that will go stale.
Fixes#4742.
R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7229081
Those symbols are only allowed during imports;
the parser may expect them but saying that doesn't help users.
Fixes#3434.
R=ken2
CC=golang-dev
https://golang.org/cl/7277045
For consistency with conversions that look like function calls,
conversions that don't look like function calls now allow an
optional trailing comma.
That is, int(x,) has always been syntactically valid.
Now []int(x,) is valid too.
Fixes#4162.
R=ken2
CC=golang-dev
https://golang.org/cl/7288045
Expressions involving nil, even if they can be evaluated
at compile time, do not count as Go constants and cannot
be used in const initializers.
Fixes#4673.
Fixes#4680.
R=ken2
CC=golang-dev
https://golang.org/cl/7278043
Change the stack unwinding code to compensate for the dynamic
relocation of symbols.
Change the gc instruction GC_CALL to use a relative offset instead of
an absolute address.
R=golang-dev
CC=golang-dev
https://golang.org/cl/7248048
Everybody either gets confused and thinks this is
TrimLeft/TrimRight or does this by hand which gets
repetitive looking.
R=rsc, kevlar
CC=golang-dev
https://golang.org/cl/7239044
Cut out temporary cgo file in error message.
Show C.foo instead of _Ctype_foo.
Before:
x.go:20[/var/folders/00/05_b8000h01000cxqpysvccm000n9d/T/go-build242036121/command-line-arguments/_obj/x.cgo1.go:19]: cannot use tv.Usec (type int32) as type _Ctype___darwin_suseconds_t in assignment
After:
x.go:20: cannot use tv.Usec (type int32) as type C.__darwin_suseconds_t in assignment
Fixes#4255.
R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7231075
The old version was using go/ast's CommentGroup.Text method,
but that method drops leading blank lines from the result, so that
if the comment looked like one of
//
// syntax error
import "C"
/*
syntax error
*/
import "C"
then the line numbers for the syntax error would be off by the
number of leading blank lines (1 in each of the above cases).
The new text extractor preserves blank lines.
Fixes#4019.
R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7232071
The Unix and Plan 9 readfile call breset(b) but Windows was not,
leaving dregs in the buffer.
TBR=golang-dev
CC=golang-dev
https://golang.org/cl/7229069
If runtime's proc.c does not compile, cmd/dist used to show
the compile errors in a sea of acid output, making them impossible
to find. Change the command invocation to write the acid output
to a file, so that the errors are the only thing shown on failure.
R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7221082
A step toward a fix for issue 4069.
To allow linking with arbitrary host object files, add a linker mode
that can generate a host object file instead of an executable.
Then the host linker can be invoked to generate the final executable.
This CL adds a new -hostobj flag that instructs the linker to write
a host object file instead of an executable.
That is, this works:
go tool 6g x.go
go tool 6l -hostobj -o x.o x.6
ld -e _rt0_amd64_linux x.o
./a.out
as does:
go tool 8g x.go
go tool 8l -hostld ignored -o x.o x.8
ld -m elf_i386 -e _rt0_386_linux x.o
./a.out
Because 5l was never updated to use the standard relocation scheme,
it will take more work to get this working on ARM.
This is a checkpoint of the basic functionality. It does not work
with cgo yet, and cgo is the main reason for the change.
The command-line interface will likely change too.
The gc linker has other information that needs to be returned to
the caller for use when invoking the host linker besides the single
object file.
R=iant, iant
CC=golang-dev
https://golang.org/cl/7060044
* Reject import paths of the form cmd/x/y.
* Reject 'go install' of command outside GOPATH
* Clearer error rejecting 'go install' of package outside GOPATH.
* Name temporary binary for first file in 'go run' list or for test.
* Provide a way to pass -ldflags arguments with spaces.
* Pass all Go files (even +build ignored ones) to go fix, go fmt, go vet.
* Reject 'go run foo_test.go'.
* Silence 'exit 1' prints from 'go tool' invocations.
* Make go test -xxxprofile leave binary behind for analysis.
* Reject ~ in GOPATH except on Windows.
* Get a little less confused by symlinks.
* Document that go test x y z runs three test binaries.
* Fix go test -timeout=0.
* Add -tags flag to 'go list'.
* Use pkg/gccgo_$GOOS_$GOARCH for gccgo output.
Fixes#3389.
Fixes#3500.
Fixes#3503.
Fixes#3760.
Fixes#3941.
Fixes#4007.
Fixes#4032.
Fixes#4074.
Fixes#4127.
Fixes#4140.
Fixes#4311.
Fixes#4568.
Fixes#4576.
Fixes#4702.
R=adg
CC=golang-dev
https://golang.org/cl/7225074
The linker accepts MOVB involving non-byte-addressable
registers, by generating XCHG instructions to AX or BX.
It does not handle the case where nor AX nor BX are available.
See also revision 1470920a2804.
Assembling
TEXT ·Truc(SB),7,$0
MOVB BP, (BX)(AX*1)
RET
gives before:
08048c60 <main.Truc>:
8048c60: 87 dd xchg %ebx,%ebp
8048c62: 88 1c 03 mov %bl,(%ebx,%eax,1)
8048c65: 87 dd xchg %ebx,%ebp
8048c67: c3 ret
and after:
08048c60 <main.Truc>:
8048c60: 87 cd xchg %ecx,%ebp
8048c62: 88 0c 03 mov %cl,(%ebx,%eax,1)
8048c65: 87 cd xchg %ecx,%ebp
8048c67: c3 ret
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7226066
Export data was broken after revision 6b602ab487d6
when -l is specified at least 3 times: it makes the compiler
write out func (*T).Method() declarations in export data, which
is not supported.
Also fix the formatting of recover() in export data. It was
not treated like panic() and was rendered as "<node RECOVER>".
R=golang-dev, lvd, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7067051
To allow for stdcall decorated names on Windows, two changes were needed:
1. Change the symbol versioning delimiter '@' in cgo's dynimport output to a '#', and in cmd/ld when it parses dynimports.
2. Remove the "@N" decorator from the first argument of cgo's dynimport output (PE only).
Fixes#4607.
R=minux.ma, adg, rsc
CC=golang-dev
https://golang.org/cl/7047043
Re-assigning the return value of an atomic operation to the same variable being operated is a common mistake:
x = atomic.AddUint64(&x, 1)
Add this check to go vet.
Fixes#4065.
R=dvyukov, golang-dev, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/7097048
This change also resolves some issues with note handling: we now make
sure that there is enough room at the bottom of every goroutine to
execute the note handler, and the `exitstatus' is no longer a global
entity, which resolves some race conditions.
R=rminnich, npe, rsc, ality
CC=golang-dev
https://golang.org/cl/6569068
The dumping routine incorrectly assumed that all incoming
symbols would be non-nil and load through it to retrieve the
symbol name. Instead of using the symbol to retrieve a name,
use the name provided by the caller.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7224043
These changes to test.bash were intended to be submitted with CL 6941058, but were accidentally excluded from the original CL.
R=golang-dev
CC=golang-dev
https://golang.org/cl/7232043
It wasn't removing names from func parameters for func types,
and it was handling "a, b string" as "string", not "string, string".
Fixes#4688
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7181051
Before:
$ go list -f '{{range .Deps}}{{println $.Name .}}{{end}}' math time
math runtime
math unsafe
time errors
time runtime
time sync
time sync/atomic
time syscall
time unsafe
$
After:
$ go list -f '{{range .Deps}}{{println $.Name .}}{{end}}' math time
math runtime
math unsafe
time errors
time runtime
time sync
time sync/atomic
time syscall
time unsafe
$
R=minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7130052
1. note that to use C.free <stdlib.h> must be included
2. can also extract errno from a void C function
R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6935045
sizeof(Adr) from 24 bytes down to 20 bytes.
sizeof(Prog) from 84 bytes down to 76 bytes.
5l linking cmd/godoc statistics:
Before:
Maximum resident set size (kbytes): 106668
After:
Maximum resident set size (kbytes): 99412
R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7100059
Prog
* Remove the unused Prog* dlink
* note that align is also unused, but removing it does not help due to alignment issues.
Saves 4 bytes, sizeof(Prog): 84 => 80.
Sym
* Align {u,}char fields on word boundaries
Saves 4 bytes, sizeof(Sym): 136 => 132.
Tested on linux/arm and freebsd/arm.
R=minux.ma, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/7106050
cmd/8g/gsubr.c: unreachable code
cmd/8g/reg.c: overspecifed class
cmd/dist/plan9.c: unused parameter
cmd/gc/fmt.c: stkdelta is now a vlong
cmd/gc/racewalk.c: used but not set
R=golang-dev, seed, rsc
CC=golang-dev
https://golang.org/cl/7067052
The FmtLong flag should only be used with the %D verb
when printing an ATEXT Prog. It was erroneously used
for every Prog except ADATA. This caused a preponderance
of exclamation points, "!!", in the assembly listings.
I also cleaned up the code so that the list.c files look
very similar. Now the real differences are easily spotted
with a simple diff.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7128045
For simplicity, only recognizes expressions of the exact form
"(x << a) | (x >> b)" where x is a variable and a and b are
integer constant expressions that add to x's bit width.
Fixes#4629.
$ cat rotate.c
unsigned int
rotate(unsigned int x)
{
x = (x << 3) | (x >> (sizeof(x) * 8 - 3));
return x;
}
## BEFORE
$ go tool 6c -S rotate.c
(rotate.c:2) TEXT rotate+0(SB),$0-8
(rotate.c:2) MOVL x+0(FP),!!DX
(rotate.c:4) MOVL DX,!!AX
(rotate.c:4) SALL $3,!!AX
(rotate.c:4) MOVL DX,!!CX
(rotate.c:4) SHRL $29,!!CX
(rotate.c:4) ORL CX,!!AX
(rotate.c:5) RET ,!!
(rotate.c:5) RET ,!!
(rotate.c:5) END ,!!
## AFTER
$ go tool 6c -S rotate.c
(rotate.c:2) TEXT rotate+0(SB),$0-8
(rotate.c:4) MOVL x+0(FP),!!AX
(rotate.c:4) ROLL $3,!!AX
(rotate.c:5) RET ,!!
(rotate.c:5) RET ,!!
(rotate.c:5) END ,!!
R=rsc, minux.ma
CC=golang-dev
https://golang.org/cl/7069056
The test case of issue 4585 was not passing due to
miscalculation of memequal args, and the previous fix
does not handle padding at the end of a struct.
Handling of padding at end of structs also fixes the case
of [n]T where T is such a padded struct.
Fixes#4585.
(again)
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7133059
Reference the 80386 compiler documentation now that the
documentation for the 68020 is offline.
R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7127053
sse2 is a more precise description of the requirement,
and it matches what people will see in, for example
grep sse2 /proc/cpuinfo # linux
sysctl hw.optional.sse2 # os x
R=golang-dev, dsymonds, iant
CC=golang-dev
https://golang.org/cl/7057050
