its own compiler, assembler, linker and tools, as well as the Go runtime and standard library. gccgo: extends the gcc project to support Go. llgo: built on top of the LLVM compiler infrastructure.

the gc compiler. This paper describes the second, a frontend to gcc, generally known as gccgo. A goal of the gccgo project is to be a typical gcc frontend. It is intended to require minimal changes to other from the less conventional gc compiler, which does significant code generation work at link time. Gccgo is written in C++. As of this writing it is slightly more than 50,000 lines, including blank lines object: a function, variable, type, constant, or package. Each of these structures is a class in gccgo's source code. The Statement, Expression and Type classes are base classes with pure virtual functions

Changes to the code are reviewed before being committed. The gccgo front end for GCC is hosted as a branch on the GCC Subversion server. See the gccgo installation instructions. ' alt='OCR图片'/> with a BSD-style license. There are two official Go compiler toolchains: the gcc Go compiler and the gccgo compiler that is part of the GNU C Compiler (GCC). The gc compiler is the more mature and well-tested compiler from source, see Installing Go from source. For information about installing gccgo, see Setting up and using gccgo. ## Download the Go tools Visit the Go project's downloads page and select the

Thompson) more experimental. generates OK code very quickly. not GCC-linkable but has FFI support. gccgo (Ian Taylor) Go front end for GCC. generates good code not as quickly. Both support 32- and 64-bit improving. 6g has good goroutine support, muxes them onto threads, implements segmented stacks. GCCGO is (for a little while yet) lacking segmented stacks, allocates one goroutine per thread. ## Garbage Recycler garbage collector $ ^{*} $ to build a very efficient, low-latency concurrent collector. GCCGO at the moment has no collector; the new collector is being developed for both compilers. ## Libraries

compiler, not for garbage collection GC). The Go design team also maintains a second Go compiler, gccgo. Nowadays it's use is less popular than gc, but it always serves as a reference, and both compilers declared variable must be used at least once effectively Please note, the standard Go compiler and gccgo both don't allow local variables declared but not used. Package-level variables have no such limit the current standard Go compiler (version 1.21.n) allows duplicate boolean case expressions, and gccgo (v8.2) allows both duplicate boolean and string case expressions. As the comments in the above example

compiler, not for garbage collection GC). The Go design team also maintains a second Go compiler, gccgo. Nowadays it's use is less popular than gc, but it always serves as a reference, and both compilers declared variable must be used at least once effectively Please note, the standard Go compiler and gccgo both don't allow local variables declared but not used. Package-level variables have no such limit the current standard Go compiler (version 1.21.n) allows duplicate boolean case expressions ☐, and gccgo (v8.2) allows both duplicate boolean and string case expressions. As the comments in the above example

compiler, not for garbage collection GC). The Go design team also maintains a second Go compiler, gccgo. Nowadays it's use is less popular than gc, but it always serves as a reference, and both compilers declared variable must be used at least once effectively Please note, the standard Go compiler and gccgo both don't allow local variables declared but not used. Package-level variables have no such limit the current standard Go compiler (version 1.21.n) allows duplicate boolean case expressions ☐, and gccgo (v8.2) allows both duplicate boolean and string case expressions. As the comments in the above example

译器。标准编译器也常常称为gc（是Go compiler的缩写，不是垃圾回收garbage collection的缩写）。Go官方设计和开发团队也维护着另外一个编译器，gccgo。gccgo是gcc编译器项目的一个子项目。gccgo的使用广泛度大不如gc，它的主要作用是作为一个参考，来保证gc的实现正确性。目前两个编译器的开发都很活跃，尽管Go开发团队在gc的开发上花费的精力更多。 gc编译器是 21版本）认为上例中的case 6，7，8一行是不合法的（如果此行未被注释掉）。但是其它编译器未必这么认为。事实上，当前的官方标准编译器允许重复的布尔case表达式在同一个switch-case流程控制中出现，而gccgo（v8.2）允许重复的布尔和字符串类型的case表达式在同一个switch-case流程控制中出现。 上面的例子中的前两个case分支中的注释已经解释了，和很多其它语言不一样，每个分支代码块的结 guarantee）。注意，同一个类型的值做为结构体字段和非结构体字段时地址对齐保证可能是不同的。当然，这和具体编译器的实现有关。对于目前的标准编译器，同一个类型的值做为结构体字段和非结构体字段时的地址对齐保证总是相同的。gccgo编译器对这两种情形是区别对待的。 - func Offsetof(selector ArbitraryType) uintptr。此函数用来取得一个结构体值的某个字段的地址相对于此结构体值的地址

译器。标准编译器也常常称为gc（是Go compiler的缩写，不是垃圾回收garbage collection的缩写）。Go官方设计和开发团队也维护着另外一个编译器，gccgo。gccgo是gcc编译器项目的一个子项目。gccgo的使用广泛度大不如gc，它的主要作用是作为一个参考，来保证gc的实现正确性。目前两个编译器的开发都很活跃，尽管Go开发团队在gc的开发上花费的精力更多。 gc 编译器 事实上，当前的官方标准编译器允许重复的布尔case表达式在同一个switch-case流程控制中出现 (https://github.com/golang/go/issues/28357)，而gccgo（v8.2）允许重复的布尔和字符串类型的case表达式在同一个switch-case流程控制中出现。 上面的例子中的前两个 case 分支中的注释已经解释了，和很多其它语言不一样，每个分支代码块的结尾不需要一条 guarantee）。注意，同一个类型的值做为结构体字段和非结构体字段时地址对齐保证可能是不同的。当然，这和具体编译器的实现有关。对于目前的标准编译器，同一个类型的值做为结构体字段和非结构体字段时的地址对齐保证总是相同的。gccgo 编译器对这两种情形是区别对待的。 - func Offsetof(selector ArbitraryType) uintptr。此函数用来取得一个结构体值的某个字段的地址相对于此结构体值的地

译器。标准编译器也常常称为gc（是Go compiler的缩写，不是垃圾回收garbage collection的缩写）。Go官方设计和开发团队也维护着另外一个编译器，gccgo。gccgo是gcc编译器项目的一个子项目。gccgo的使用广泛度大不如gc，它的主要作用是作为一个参考，来保证gc的实现正确性。目前两个编译器的开发都很活跃，尽管Go开发团队在gc的开发上花费的精力更多。 gc 编译器是 21版本）认为上例中的case 6，7，8一行是不合法的（如果此行未被注释掉）。但是其它编译器未必这么认为。事实上，当前的官方标准编译器允许重复的布尔case表达式在同一个switch-case流程控制中出现，而gccgo（v8.2）允许重复的布尔和字符串类型的case表达式在同一个switch-case流程控制中出现。 上面的例子中的前两个case分支中的注释已经解释了，和很多其它语言不一样，每个分支代码块的结 guarantee）。注意，同一个类型的值做为结构体字段和非结构体字段时地址对齐保证可能是不同的。当然，这和具体编译器的实现有关。对于目前的标准编译器，同一个类型的值做为结构体字段和非结构体字段时的地址对齐保证总是相同的。gccgo编译器对这两种情形是区别对待的。 - func Offsetof(selector ArbitraryType) uintptr。此函数用来取得一个结构体值的某个字段的地址相对于此结构体值的地址