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path: root/usr/austin/eval/compiler.go
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2009-07-29Flatten the Frame tree. Now each function call produces aAustin Clements1-10/+7
single frame and non-overlapping variables reuse frame slots. As a result, entering and exiting blocks no longer requires code execution, which means jumps across block boundaries should be doable now. Frame slot initialization happens at definition time now, instead of at frame creation time. As an added bonus, Scope's are now exclusively compile-time objects and we no longer need to specially track the function activation frame for access to out vars. R=rsc APPROVED=rsc DELTA=313 (102 added, 90 deleted, 121 changed) OCL=32416 CL=32420
2009-07-28Implement if, for (modulo ranges), break, continue, increment,Austin Clements1-2/+16
and decrement. blockCompilers now form a tree the mimics the nesting of scopes and provide convenient ways to enter and exit scopes. blockCompilers also track the break and continue PC for the current block. The statement testing interface now works in lists of statements, which simplifies a bunch of things. R=rsc APPROVED=rsc DELTA=401 (335 added, 44 deleted, 22 changed) OCL=32308 CL=32317
2009-07-27Implement multi-valued functions, multi-valued return, andAustin Clements1-1/+5
unpacking for assignments, call arguments, and returns. This change revamps the whole assignment compilation system to be multi-valued, using the new MultiType type and multiV value. Function calls, returns, and assignments now share a lot of code and produce very consistent error messages. R=rsc APPROVED=rsc DELTA=510 (335 added, 74 deleted, 101 changed) OCL=32248 CL=32258
2009-07-27Implement single-valued, non-variadic function literals andAustin Clements1-0/+79
function calling. Implement a type compiler and named types. Implement a universal scope containing built-in named types, and some built-in constants. Implement a simple virtual machine for executing statements and single-valued return. Fix many places that incorrectly dealt with named types. In particular, the Type.Zero methods now use the type's bit count to determine the appropriate value representation. As a result, a bit count of 0 now means architecture-dependent and bounded types use unsafe.Sizeof to determine the correct bounds. Previously, the bounds on a 32-bit machine would have been wrong. Eliminated Type.compatible, since the implementation is equivalent for all types. Added Type.rep that shallowly strips named types. Replaced almost all uses of Type.literal with Type.rep. Fix implementation of assign-op's so it only evaluates the left side once. As part of this, there is now a generic way to separate out the effect and value of an expression. R=rsc APPROVED=rsc DELTA=1530 (1244 added, 68 deleted, 218 changed) OCL=32184 CL=32230