This will make the intention clearer.
This is migrated from pre-c2go CL 4930.

Change-Id: I9103126a05323daedd729a43b94b2be8cd7408c9
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7410Reviewed-by: Austin Clements <austin@google.com>

Many headers in DWARF sections have a "unit length" that can be either
4 bytes or 12 bytes and indicates both the length of the unit and
whether the unit is in 32-bit or 64-bit format.

Currently, we implement unit length parsing in four different places.
Add a "unitLength" method to buf that parses a unit length and use it
in these four places.

Change-Id: I7950b91caaa92aa5e19aa63debc8ae46178ecc4d
Reviewed-on: https://go-review.googlesource.com/7281Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

The conversion of this logic from C introduced a few subtle behavior
changes.  E.g., assigning "name := data[p0:]" and then "name =
name[:p1-p0]" actually caused name to span the vast majority of the
package data, as at the time of the second statement p0 points just
after the package name and p1 points to the end of the package data.

Similarly, the logic for advancing past the newline at the end of the
package line changed slightly: for a "package foo safe" line, the new
code would only advance up to the newline, but not past.  (Albeit, in
practice this doesn't matter: newlines in package data are harmless.)

Lastly, "data[p0]" was incorrectly written as "data[0]" a few times.

Change-Id: I49017e16ba33a627f773532b418cbf85a84f2b4b
Reviewed-on: https://go-review.googlesource.com/7000Reviewed-by: Ian Lance Taylor <iant@golang.org>

The slash is replaced with os.PathSeparator before returning.
Split, SplitList are the exceptions; comments for them mention this.

Fixes golang/go#10122.

Change-Id: I66dbee8d09f378582e046be8df309a3930151820
Reviewed-on: https://go-review.googlesource.com/7310Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Rob Pike <r@golang.org>

Everything has moved to Go, but comments still refer to .c/.h files.
Fix all of those up, at least for these three directories.

Fixes #10138

Change-Id: Ie5efe89b247841e0b3f82aac5256b2c606ef67dc
Reviewed-on: https://go-review.googlesource.com/7431Reviewed-by: Russ Cox <rsc@golang.org>

Add cmd/internal/obj/stringer.go to do the generation and update
the architecture packages to use it to maintain the Anames tables.

Change-Id: I9c6d4def1bf21624668396d70c17973d0db11fbc
Reviewed-on: https://go-review.googlesource.com/7430Reviewed-by: Russ Cox <rsc@golang.org>

It's an oddball that needs special treatment because it is not really
an opcode, but a variant of MRC.

The String method of Prog still needs updating to print it nicely.

Change-Id: I6005b7f2234ccd3d4ac1f658948e3be97cf1f1c2
Reviewed-on: https://go-review.googlesource.com/7220Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Russ Cox <rsc@golang.org>

This allows to test goroutine analysis code in runtime/pprof tests.
Also fix a nil-deref crash in goroutine analysis code that happens on runtime/pprof tests.

Change-Id: Id7884aa29f7fe4a8d7042482a86fe434e030461e
Reviewed-on: https://go-review.googlesource.com/7301
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

Augment ProcStart events with OS thread id.
This helps in scheduler locality analysis.

Change-Id: I93fea75d3072cf68de66110d0b59d07101badcb5
Reviewed-on: https://go-review.googlesource.com/7302Reviewed-by: Keith Randall <khr@golang.org>

Fixes #10129.

Change-Id: I9f56c483726f14b6c1909740549de236d5bf9cfb
Reviewed-on: https://go-review.googlesource.com/7340Reviewed-by: Ian Lance Taylor <iant@golang.org>

More cleanups to gc.Node

- make Node.Local a boolean
- make Type.Local a boolean
- reduce the size of Node.Esc to a uint8

Reducing the size of Node.Esc shaves ~45mb off the RSS compiling cmd/internal/gc on amd64

before:
        Maximum resident set size (kbytes): 659496
after:
        Maximum resident set size (kbytes): 612196

- declare gc.Funcdepth as int32
- declare Node.Funcdepth as int32

In both cases, these were previously machine specific int types. This doesn't result in
any memory saving at the moment due to struct padding.

Change-Id: Iabef8da15e962fe8b79d7fd3d402fb26ce7ec31c
Reviewed-on: https://go-review.googlesource.com/7261Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This change adds the minimum necessary to implement applyRelocations.

For adg, this code uses the switch statement.

Change-Id: I0989daab8d0e36c2a4f6a315ced258b832744616
Reviewed-on: https://go-review.googlesource.com/7266Reviewed-by: Ian Lance Taylor <iant@golang.org>

The testdata was generated by:
convert video-001.png tmp1.tga
cjpeg -quality 100 -sample 2x2,1x2,1x2 tmp1.tga > video-001.221212.jpeg
djpeg -nosmooth -targa video-001.221212.jpeg > tmp2.tga
convert tmp2.tga video-001.221212.png
rm tmp1.tga tmp2.tga

Change-Id: Ica241dfc19b3eb47ade150bf0432373c6006c38a
Reviewed-on: https://go-review.googlesource.com/7264Reviewed-by: Rob Pike <r@golang.org>

Updates #9974

This change is in preparation for merging the arm64 platform.

Arm64 does not support SYS_DUP2 at all, so define a new constant to be
the minimum dup(2) version supported. This constant defaults to SYS_DUP2
on all existing platforms.

Change-Id: If405878105082c7c880f8541c1491970124c9ce4
Reviewed-on: https://go-review.googlesource.com/7123Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>

Kick start the upstreaming of the arm64 port. The only manual
change is cmd/go/pkg.go.

Change-Id: I0607ad045486f0998c4e21654b59276ca5348069
Reviewed-on: https://go-review.googlesource.com/7075Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Run-TryBot: Aram Hăvărneanu <aram@mgk.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #10125.

Change-Id: I99032912650cef8e5bf124bda0a60d5899760103
Reviewed-on: https://go-review.googlesource.com/7320Reviewed-by: Robert Griesemer <gri@golang.org>

Some of the trace stacks are OS-dependent due to OS-specific code
in net package. Check these stacks only on subset of OSes.

Change-Id: If95e4485839f4120fd6395725374c3a2f8706dfc
Reviewed-on: https://go-review.googlesource.com/7300
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

Even though the world is stopped the GC may do pointer
writes that need to be protected by write barriers.
This means that the write barrier must be on
continuously from the time the mark phase starts and
the mark termination phase ends. Checks were added to
ensure that no allocation happens during a GC.

Hoist the logic that clears pools the start of the GC
so that the memory can be reclaimed during this GC cycle.

Change-Id: I9d1551ac5db9bac7bac0cb5370d5b2b19a9e6a52
Reviewed-on: https://go-review.googlesource.com/6990Reviewed-by: Austin Clements <austin@google.com>

Stip uninteresting bottom and top frames from trace stacks.
This makes both binary and json trace files smaller,
and also makes stacks shorter and more readable in the viewer.

Change-Id: Ib9c80ccc280504f0e235f867f53f1d2652c41583
Reviewed-on: https://go-review.googlesource.com/5523Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>

This adds simple ELF test binaries generated by gcc and clang and
compares the line tables returned by the line table reader against
tables based on the output of readelf.

The binaries were generated with
    # gcc --version | head -n1
    gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
    # gcc -g -o line-gcc.elf line*.c

    # clang --version | head -n1
    Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4)
    # clang -g -o line-clang.elf line*.c

Change-Id: Id210fdc1d007ac9719e8f5dc845f2b94eed12234
Reviewed-on: https://go-review.googlesource.com/7070Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

This implements a LineReader for line tables that parallels the
existing Reader for debug entries.

This code is partly based on the debug subrepo's fork of dwarf, but it
is a more complete (and, I believe, correct) implementation of the
spec and exposes a more general API.  While the debug subrepo's
implementation exposed only a PC-to-line function, this version
exposes the line table rows to the caller.  This way the caller can
make its own trade-offs when implementing PC-to-line (or line-to-PC),
such as whether or not to build an index for fast lookup.

Change-Id: Ie157bc817f55e940b6f2e1ae010c5a4e1f29c5c8
Reviewed-on: https://go-review.googlesource.com/6734Reviewed-by: Nigel Tao <nigeltao@golang.org>

This factors out the code for finding which unit contains an offset in
the "info" section.  The new code also replaces linear search with a
binary search.  The line table reader will also need this
functionality.

Change-Id: I2076e4fc6719b6f06fd2796cbbc7548ec1876cb3
Reviewed-on: https://go-review.googlesource.com/6733Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I1e6c6b3e2984528c0331e17755cc057e7199193e
Reviewed-on: https://go-review.googlesource.com/7071Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

Change-Id: Ia6f9bd77a3d4250339dcb054edc76942864dd358
Reviewed-on: https://go-review.googlesource.com/6781Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Previously, different DWARF sections had relocations applied in very
different ways.  .debug_info was relocated, but only on x86-64 and 386
and using hard-coded relocation section names instead of relocation
links.  .debug_abbrev and .debug_str were never relocated (which is
excusable because they shouldn't need it).  .debug_types sections were
relocated on all architectures and found their relocation section
using a relocation link because section names could be ambiguous.

Simplify all of this so that every DWARF section that has a linked
relocation section gets those relocations applied.

This prepares this code to load .debug_line sections without the need
for yet more ad hoc relocation logic.

Change-Id: Ia00ac8e656b22f22bb31a5f6ef9b0f23cda64d19
Reviewed-on: https://go-review.googlesource.com/6780Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

The testdata was generated by:
convert video-001.png tmp1.tga
cjpeg -rgb -sample 2x2,1x1,1x1 tmp1.tga > video-001.rgb.jpeg
djpeg -nosmooth -targa video-001.rgb.jpeg > tmp2.tga
convert tmp2.tga video-001.rgb.png
rm tmp1.tga tmp2.tga

Change-Id: I5da0591b9005c1c75e807311f157d385e0e20a38
Reviewed-on: https://go-review.googlesource.com/6910Reviewed-by: Rob Pike <r@golang.org>

Convert Node.Isddd to a boolean and simplify usage.

- Node.Isddd converted to bool
- Type.Isddd converted to bool
- mkinlcall converted to take isddd as a bool
- typecheckaste converted to take isddd as a bool
- ascompatte converted to take isddd as a bool

Change-Id: I52586145619c44182bb0c2c5d80a0a3fe3e50a07
Reviewed-on: https://go-review.googlesource.com/7172Reviewed-by: Keith Randall <khr@golang.org>

Removes a potential data race between os.Setenv and runtime.GOROOT,
along with a bug where os.Setenv would only sometimes change the
value of runtime.GOROOT.

Change-Id: I7d2a905115c667ea6e73f349f3784a1d3e8f810d
Reviewed-on: https://go-review.googlesource.com/6611Reviewed-by: Keith Randall <khr@golang.org>

Change-Id: I9d2c84237f7b1c4dc2e53adf249b7518dda81a21
Reviewed-on: https://go-review.googlesource.com/7165
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

Updates #7338.

Change-Id: I859a73543352dbdd13ec05efb23a95aecbcc628a
Reviewed-on: https://go-review.googlesource.com/7164Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The struct XMLName sets the default namespace, but
that's not good enough for nested tags, because an
earlier tag can set the implicit parents of a subsequent
tag. This change makes sure that we always explicitly set the
namespace on a tag when possible.

See https://go-review.googlesource.com/#/c/5910/4/src/encoding/xml/marshal_test.go@628
for discussion.

Change-Id: If1afc536471c0be83e5dd80381b598476ea3f44d
Reviewed-on: https://go-review.googlesource.com/6927Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>

More Node cleanups, these ones touch go.y.

- convert Node.Implicit to bool
- convert Node.Used to bool

Change-Id: I85c7ff9e66cee7122b560adedc995166c874f2f2
Reviewed-on: https://go-review.googlesource.com/7124Reviewed-by: Keith Randall <khr@golang.org>

Updates #10119

Temporarily disable cgo by default to get the freebsd/arm
builder running again.

Change-Id: I4de1f896fcac650184df77c692b102ea6fb73bba
Reviewed-on: https://go-review.googlesource.com/7125Reviewed-by: Andrew Gerrand <adg@golang.org>

Fix the build.

This reverts commit e7398151.

Change-Id: I979e138991c06b3295be08212d3ce80b30c2381b
Reviewed-on: https://go-review.googlesource.com/7160Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Minux Ma <minux@golang.org>

Somehow, terribly embarrassingly, I lost part of the "re-enable
-shared on amd64" patch when rebasing before it got submitted.
This restores it and also fixes the addend to be the necessary -4.

Change-Id: If71a09121d911a863bc07f1828ef76e3a54c1074
Reviewed-on: https://go-review.googlesource.com/6802Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: Ifcf7b96e67b63a08f410a7ba21e8bf4dd20e7d8e
Reviewed-on: https://go-review.googlesource.com/7122Reviewed-by: Minux Ma <minux@golang.org>

The unix and windows getaddrinfo calls return a zone with IPv6
addresses. IPv6 link-local addresses returned are only valid on the
given zone. When the zone is dropped, connections to the address
will fail. This patch replaces IP with IPAddr in several internal
resolver functions, and plumbs through the zone.

Change-Id: Ifea891654f586f15b76988464f82e04a42ccff6d
Reviewed-on: https://go-review.googlesource.com/5851Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>

some x86 instructions (e.g. PINSRW) might store memory address in Prog.From3,
so we must also rewrite Prog.From3 on nacl.

Change-Id: I2a0da0f692ba321eba17fbc454d68aaafa133515
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7074
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>

Also fixed a stack corruption bug for nacl/amd64p32.

Change-Id: I64b821b16999c296a159137d971af3870053c621
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7073Reviewed-by: Dave Cheney <dave@cheney.net>

Change-Id: I11b4cf00ceeb4441b865e0de3f1674095d1c32d0
Reviewed-on: https://go-review.googlesource.com/7043Reviewed-by: Ian Lance Taylor <iant@golang.org>