5cd022d6c0
This can be used to import a dynamic shared object and return an
arbitrary value, including new primops. This can be used both to test
new primops without having to recompile nix every time, and to build
specialized primops that probably don't belong upstream (e.g. a function
that calls out to gpg to decrypt a nixops secret as-needed).
The imported function should initialize the Value & as needed. A single
import can define multiple values by creating an attrset or list, of
course.
An example initialization function might look like:
extern "C" void initialize(nix::EvalState & state, nix::Value & v)
{
v.type = nix::tPrimOp;
v.primOp = NEW nix::PrimOp(myFun, 1, state.symbols.create("myFun"));
}
Then `builtins.importNative ./example.so "initialize"` will evaluate to
the primop defined in the myFun function.
31 lines
1,015 B
Makefile
31 lines
1,015 B
Makefile
libraries += libexpr
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libexpr_NAME = libnixexpr
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libexpr_DIR := $(d)
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libexpr_SOURCES := $(wildcard $(d)/*.cc) $(d)/lexer-tab.cc $(d)/parser-tab.cc
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libexpr_LIBS = libutil libstore libformat
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libexpr_LDFLAGS = -ldl
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# The dependency on libgc must be propagated (i.e. meaning that
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# programs/libraries that use libexpr must explicitly pass -lgc),
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# because inline functions in libexpr's header files call libgc.
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libexpr_LDFLAGS_PROPAGATED = $(BDW_GC_LIBS)
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$(d)/parser-tab.cc $(d)/parser-tab.hh: $(d)/parser.y
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$(trace-gen) bison -v -o $(libexpr_DIR)/parser-tab.cc $< -d
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$(d)/lexer-tab.cc $(d)/lexer-tab.hh: $(d)/lexer.l
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$(trace-gen) flex --outfile $(libexpr_DIR)/lexer-tab.cc --header-file=$(libexpr_DIR)/lexer-tab.hh $<
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$(d)/lexer-tab.o: $(d)/lexer-tab.hh $(d)/parser-tab.hh
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$(d)/parser-tab.o: $(d)/lexer-tab.hh $(d)/parser-tab.hh
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clean-files += $(d)/parser-tab.cc $(d)/parser-tab.hh $(d)/lexer-tab.cc $(d)/lexer-tab.hh
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dist-files += $(d)/parser-tab.cc $(d)/parser-tab.hh $(d)/lexer-tab.cc $(d)/lexer-tab.hh
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