9 Scheme API for Compilation
The compiler/compiler library provides the functionality of mzc for compilation to bytecode and via C, but through a Scheme API.
9.1 Bytecode Compilation
((compile-zos expr) scheme-files dest-dir) → void? |
expr : any/c |
scheme-files : (listof path-string?) |
dest-dir : (or/c path-string? false/c (one-of/c 'auto)) |
Supplying just expr returns a compiler that is initialized with the expression expr, as described below.
The compiler takes a list of Scheme files and compiles each of them to bytecode, placing the resulting bytecode in a ".zo" file within the directory specified by dest-dir. If dest-dir is #f, each bytecode result is placed in the same directory as its source file. If dest-dir is 'auto, each bytecode file is placed in a "compiled" subdirectory relative to the source; the directory is created if necessary.
If expr is anything other than #f, then a namespace is created for compiling the files that are supplied later; expr is evaluated to initialize the created namespace. For example, expr might load a set of macros. In addition, the expansion-time part of each expression later compiled is evaluated in the namespace before being compiled, so that the effects are visible when compiling later expressions.
If expr is #f, then no compilation namespace is created, and expressions in the files are assumed to compile independently (so there’s no need to evaluate the expansion-time part of an expression to compile).
Typically, expr is #f for compiling module files, and it is (void) for compiling files with top-level definitions and expressions.
(compile-collection-zos collection ) → void? |
collection : string? |
Compiles the specified collection’s files to ".zo" files. The ".zo" files are placed into the collection’s "compiled" directory. By default, all files with the extension ".ss" or ".scm" in a collection are compiled, as are all such files within subdirectories.
The collection compiler reads the collection’s "info.ss" file (see "info.ss" File Format) to obtain further instructions for compiling the collection. The following fields are used:
name : The name of the collection as a string, used only for status and error reporting.
compile-omit-paths : A list of immediate file and directory paths that should not be compiled. Alternatively, this field’s value 'all, which is equivalent to specifying all files and directories in the collection (to effectively ignore the collection for compilation). Automatically omitted files and directories are "compiled", "doc", and those whose names start with ..
Files that are required by other files, however, are always compiled in the process of compiling the requiring file – even when the required file is listed with this field or when the field’s value is 'all.
compile-omit-files : A list of filenames (without directory paths); that are not compiled, in addition to the contents of compile-omit-paths. Do not use this field; it is for backward compatibility.
scribblings : A list of pairs, each of which starts with a path for documentation source. The sources (and the files that they require) are compiled in the same way as ".ss" and ".scm" files.
The compilation process for an individual file is driven by managed-compile-zo from compiler/cm.
(compile-directory-zos path info) → void? |
path : path-string? |
info : () |
Like compile-collection-zos, but compiles the given directory rather than a collection. The info function behaves like the result of get-info to supply "info.ss" fields, instead of using an "info.ss" file (if any) in the directory.
9.2 Compilation via C
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expr : any/c | |||||||||||||||||||||
scheme-files : (listof path-string?) | |||||||||||||||||||||
dest-dir : (or/c path-string? false/c (one-of/c 'auto)) |
Like compile-zos, but the scheme-files are compiled to native-code extensions via C. If dest-dir is 'auto, each extension file (".dll", ".so", or ".dylib") is placed in a subdirectory relative to the source produced by (build-path "compiled" "native" (system-library-subpath)); the directory is created if necessary.
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expr : any/c | |||||||||||||||||||||
scheme-files : (listof path-string?) | |||||||||||||||||||||
dest-dir : (or/c path-string? false/c (one-of/c 'auto)) |
Like compile-extensions, but only ".c" files are produced, not extensions.
(compile-c-extensions c-files dest-dir) → void? |
c-files : (listof path-string?) |
dest-dir : (or/c path-string? false/c (one-of/c 'auto)) |
Compiles each ".c" file (usually produced with compile-extensions-to-c) in c-files to an extension. The dest-dir argument is handled as in compile-extensions.
9.3 Loading compiler support
The compiler unit loads certain tools on demand via dynamic-require and get-info. If the namespace used during compilation is different from the namespace used to load the compiler, or if other load-related parameters are set, then the following parameter can be used to restore settings for dynamic-require.
A parameter whose value is a procedure that takes a thunk to apply. The default wrapper sets the current namespace (via parameterize) before calling the thunk, using the namespace in which the compiler/compiler library was originally instantiated.
9.4 Options for the Compiler
The compiler/option module provides options (in the form of parameters) that control the compiler’s behaviors.
More options are defined by the dynext/compile and dynext/link libraries, which control the actual C compiler and linker that are used for compilation via C.
on? : any/c |
A #t value for the parameter causes the compiler to print verbose messages about its operations. The default is #f.
(setup-prefix) → string? |
(setup-prefix str) → void? |
str : string? |
A parameter that specifies a string to embed in public function names when compiling via C. This is used mainly for compiling extensions with the collection name so that cross-extension conflicts are less likely in architectures that expose the public names of loaded extensions. The default is "".
(clean-intermediate-files clean?) → void? |
clean? : any/c |
A #f value for the parameter keeps intermediate ".c" and ".o" files generated during compilation via C. The default is #t.
(compile-subcollections) → (one-of/c #t #f) |
(compile-subcollections cols) → void? |
cols : (one-of/c #t #f) |
A parameter that specifies whether sub-collections are compiled by compile-collection-zos. The default is #t.
(compile-for-embedded embed?) → void? |
embed? : any/c |
A #t values for this parameter creates ".c" files and object files to be linked directly with an embedded PLT Scheme run-time system, instead of ".c" files and object files to be dynamically loaded into PLT Scheme as an extension. The default is #f.
(propagate-constants prop?) → void? |
prop? : any/c |
A parameter to control the compiler’s constant propagating when compiling via C. The default is #t.
(assume-primitives assume?) → void? |
assume? : any/c |
A #t parameter value effectively adds (require mzscheme) to the beginning of the program. This parameter is useful only when compiling non-module code. The default is #f.
allow? : any/c |
A parameter that allow obvious non-syntactic errors, such as ((lambda () 0) 1 2 3), when compiling via C. The default is #f.
mode : symbol? |
A parameter that controls how closures are compiled via C. The possible values are:
'vehicles:automatic : automatic grouping
'vehicles:functions : groups within a procedure
'vehicles:monolithic : groups randomly
(vehicles:monoliths count) → void? |
count : exact-nonnegative-integer? |
A parameter that determines the number of random groups for 'vehicles:monolithic mode.
Sets the randomizer seed for 'vehicles:monolithic mode.
A parameter that determines the number of top-level Scheme expressions crammed into one C function when compiling via C. The default is 25.
(unpack-environments unpack?) → void? |
unpack? : any/c |
Setting this parameter to #f might help compilation via C for register-poor architectures. The default is #t.
on? : any/c |
A #t creates a "debug.txt" debugging file when compiling via C. The default is #f.
on? : any/c |
A #t value for this parameter causes compilation via C to ignore top-level expressions with syntax errors. The default is #f.
9.5 The Compiler as a Unit
9.5.1 Signatures
compiler^ : signature |
Includes all of the names exported by compiler/compiler.
compiler:option^ : signature |
Includes all of the names exported by compiler/option.
compiler:inner^ : signature |
The high-level compiler/compiler interface relies on a low-level implementation of the extension compiler, which is available from compiler/comp-unit as implementing the compiler:inner^ signature.
(eval-compile-prefix expr) → void?
expr : any/c
Evaluates expr. Future calls to compile-extension or compile-extension-to-c see the effects of the evaluation.
(compile-extension scheme-source dest-dir) → void?
scheme-source : path-string?
dest-dir : path-string?
Compiles a single Scheme file to an extension.
scheme-source
dest-dir)
→
scheme-source : path-string?
dest-dir : path-string?
Compiles a single Scheme file to a ".c" file.
(compile-c-extension c-source dest-dir) → void?
c-source : path-string?
dest-dir : path-string?
Compiles a single ".c" file to an extension.
9.5.2 Main Compiler Unit
Provides the exports of compiler/compiler in unit form, where C-compiler operations are imports to the unit.
The unit imports compiler:option^, dynext:compile^, dynext:link^, and dynext:file^. It exports compiler^.
9.5.3 Options Unit
Provides the exports of compiler/option in unit form. It imports no signatures, and exports compiler:option^.
9.5.4 Compiler Inner Unit
The unit imports compiler:option^, dynext:compile^, dynext:link^, and dynext:file^. It exports compiler:inner^.