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Traceparser generally takes 20-30% less space than internal/trace. The only user of these pakcages is cmd/trace, and the new package lets it handle some trace files that were too large. The new parser will also convert segments of the raw trace file (e.g. the last 10 seconds) to Events. Trace files from go 1.8 and before are not supported. Change-Id: If83fa183246db8f75182ccd3ba8df07673c0ebd0 Reviewed-on: https://go-review.googlesource.com/c/137635 Run-TryBot: Peter Weinberger <pjw@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
122 lines
4.2 KiB
Plaintext
122 lines
4.2 KiB
Plaintext
Native Client
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=============
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This document outlines the basics of building and developing the Go runtime and
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programs in the Native Client (NaCl) environment.
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Go 1.3 supports three architectures
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* nacl/386 which is standard 386.
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* nacl/amd64p32 which is a 64 bit architecture, where the address space is
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limited to a 4gb window.
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* nacl/arm which is 32-bit ARMv7A architecture with 1GB address space.
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For background it is recommended that you read https://golang.org/s/go13nacl.
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Prerequisites
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-------------
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Native Client programs are executed inside a sandbox, the NaCl runtime. This
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runtime must be installed before you can use NaCl programs.
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The NaCl distribution comes with an installer which ensures you have access to
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the latest version of the runtime. The version tracks the Chrome numbering
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scheme.
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# Download NaCl
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Download nacl_sdk.zip file from
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https://developer.chrome.com/native-client/sdk/download
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and unpack it. I chose /opt/nacl_sdk.
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# Update
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The zip file contains a small skeleton that can be used to download the correct
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sdk. These are released every 6-8 weeks, in line with Chrome releases.
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% cd /opt/nacl_sdk
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% ./naclsdk update
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At this time pepper_49 is the stable version. The NaCl port needs at least pepper_39
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to work. If naclsdk downloads a later version, please adjust accordingly.
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The cmd/go helper scripts expect that the loaders sel_ldr_{x86_{32,64},arm} and
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nacl_helper_bootstrap_arm are in your path. I find it easiest to make a symlink
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from the NaCl distribution to my $GOPATH/bin directory.
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% ln -nfs /opt/nacl_sdk/pepper_39/tools/sel_ldr_x86_32 $GOPATH/bin/sel_ldr_x86_32
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% ln -nfs /opt/nacl_sdk/pepper_39/tools/sel_ldr_x86_64 $GOPATH/bin/sel_ldr_x86_64
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% ln -nfs /opt/nacl_sdk/pepper_39/tools/sel_ldr_arm $GOPATH/bin/sel_ldr_arm
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Additionally, for NaCl/ARM only:
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% ln -nfs /opt/nacl_sdk/pepper_39/tools/nacl_helper_bootstrap_arm $GOPATH/bin/nacl_helper_bootstrap_arm
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Support scripts
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---------------
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Symlink the two scripts in this directory into your $PATH, just as you did with
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NaCl sdk above.
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% ln -nfs $GOROOT/misc/nacl/go_nacl_amd64p32_exec $GOPATH/bin/go_nacl_amd64p32_exec
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% ln -nfs $GOROOT/misc/nacl/go_nacl_386_exec $GOPATH/bin/go_nacl_386_exec
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% ln -nfs $GOROOT/misc/nacl/go_nacl_arm_exec $GOPATH/bin/go_nacl_arm_exec
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Building and testing
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--------------------
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Building for NaCl is similar to cross compiling for other platforms. However,
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as it is not possible to ever build in a `native` NaCl environment, the cmd/go
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tool has been enhanced to allow the full build, all.bash, to be executed,
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rather than just the compile stage, make.bash.
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The cmd/go tool knows that if GOOS is set to `nacl` it should not try to
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execute any binaries itself. Instead it passes their execution to a support
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script which sets up a Native Client environment and invokes the NaCl sandbox.
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The script's name has a special format, go_$GOOS_$GOARCH_exec, so cmd/go can
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find it.
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In short, if the support scripts are in place, the cmd/go tool can be used as
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per normal.
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# Build and test Go for NaCl
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NaCl does not permit direct file system access. Instead, package syscall
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provides a simulated file system served by in-memory data. The script
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nacltest.bash is the NaCl equivalent of all.bash. It builds NaCl with an
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in-memory file system containing files needed for tests, and then it runs the
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tests.
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% cd go/src
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% env GOARCH=amd64p32 ./nacltest.bash
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Debugging
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---------
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Assuming that you have built nacl/amd64p32 binary ./mybin and can run as:
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% sel_ldr_x86_64 -l /dev/null -S -e ./mybin
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Create the nacl manifest file mybin.manifest with the following contents:
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{ "program": { "x86-64": { "url": "mybin" } } }
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url is the path to the binary relative to the manifest file.
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Then, run the program as:
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% sel_ldr_x86_64 -g -l /dev/null -S -e ./mybin
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The -g flag instructs the loader to stop at startup. Then, in another console:
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% /opt/nacl_sdk/pepper_39/toolchain/linux_x86_glibc/bin/x86_64-nacl-gdb
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% nacl-manifest mybin.manifest
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% target remote :4014
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If you see that the program is stopped in _rt0_amd64p32_nacl, then symbols are
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loaded successfully and you can type 'c' to start the program.
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Next time you can automate it as:
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% /opt/nacl_sdk/pepper_39/toolchain/linux_x86_glibc/bin/x86_64-nacl-gdb \
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-ex 'nacl-manifest mybin.manifest' -ex 'target remote :4014'
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