| Commit message (Collapse) | Author | Age | Files | Lines |
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Make segment management a little more consistent between initial segments
and add-on segments (using `mmap`).
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I'm still trying to figure out what the defaults should be. At the moment
you have to explicitly pass in every file you want loaded into the output
binary. Maybe that control is a good thing. The examples need no libraries
so far.
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More calling convention tweaks.
Use EBP to get consistently at parameters and locals.
Always put the first function argument closest to EBP.
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Get the calling convention right, per http://www.cs.virginia.edu/~evans/cs216/guides/x86.html
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Upgrade the test harness for the factorial "app" from ex11.
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check_ints_equal now prints a newline after the failure message on failure.
We still don't know how to print a final newline after all the tests have
run, for the common case when all tests pass.
Ideally I could just emit a few instructions to `run_tests`. But I'd also
need to add a variable for the newline to the data segment. Or I need some
literal syntax for newlines in strings. We don't have support for backslash-escapes
yet.
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Extract a helper from the factorial unit test: check_ints_equal.
Start of a vocabulary for unit tests.
I *could* also start thinking of supporting multi-file programs, but I'm
going to resist the temptation for now. Copy helpers as necessary, and
allow them to mutate and diverge for a while before we pummel them into
a Procrustean "standard library". Extracting a body of shared code immediately
starts to discourage innovation in the shared code.
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No automated tests for argv_equal because we need it to run automated tests.
But maybe we should have them anyway.
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All it takes is to code-generate a simple function called 'run_tests' that
calls all functions starting with 'test_' one by one.
I've temporarily switched the factorial app to run as a test. But that's
temporary, because all the code to print '.' vs 'F' needs to get extracted
out into a helper.
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Streamline the factorial function; we don't need to save a stack variable
into a register before operating on it. All instructions can take a stack
variable directly.
In the process we found two bugs:
a) Opcode f7 was not implemented correctly. It was internally consistent
but I'd never validated it against a natively running program. Turns out
it encodes multiple instructions, not just 'not'.
b) The way we look up imm32 operands was sometimes reading them before
disp8/disp32 operands.
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