Emerald C

Simple Compiler for (somewhat) C

What is Emerald C?

Emerald C is a compiler. It's language is a lot like C, although it is not even close to compliant to ANSI or any other C standards. It is not even close to finished yet.

Emerald C is aimed to some day be ANSI C compliant, and after that to be C89 and possible C11 compliant.

It is based in part on the tutorial by Jack Crenshaw at http://compilers.iecc.com/crenshaw/ but there are marked differences. Obviously, Emerald C uses C syntax rather than a more Pascal-like one. Emerald C also outputs MIPS or amd64 instead of 68k ASM.

The amd64 code generator is known to be wrong.

Emerald C has an optimizer that targets simple peephole optimizations. It only works with the MIPS target currently.

How Emerald C Generates Code

Unlike some more complex compilers, Emerald C does not have an explicit bytecode or intermediate representation. Rather, an abstract CPU interface is defined (CPU.hpp) that is called by the parser. This is interface then outputs a series of target-specific op codes, which are written using the Flush method. How exactly the virtual CPU operations are translated into actual Assembly statements is totally independant of the parser and the actual Assembly writing features.

The actual CPU interface is currently implemented as very simple calls that immediately output op codes, a so-called pure compiler.

License

Emerald C is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

Name		Name	Last commit message	Last commit date
Latest commit History 48 Commits
MIPS		MIPS
MIPS_opt		MIPS_opt
amd64		amd64
amd64_opt		amd64_opt
new_cpu		new_cpu
CPU.cpp		CPU.cpp
CPU.hpp		CPU.hpp
README.md		README.md
SConscript		SConscript
SConstruct		SConstruct
asm.cpp		asm.cpp
asm.hpp		asm.hpp
asm_inner.hpp		asm_inner.hpp
boolean_expression.cpp		boolean_expression.cpp
boolean_expression.hpp		boolean_expression.hpp
compiler.cpp		compiler.cpp
compiler.hpp		compiler.hpp
declaration.cpp		declaration.cpp
declaration.hpp		declaration.hpp
error.cpp		error.cpp
error.hpp		error.hpp
function.cpp		function.cpp
function.hpp		function.hpp
integral_types.cpp		integral_types.cpp
integral_types.hpp		integral_types.hpp
io.cpp		io.cpp
io.hpp		io.hpp
math_expression.cpp		math_expression.cpp
math_expression.hpp		math_expression.hpp
program.cpp		program.cpp
program.hpp		program.hpp
relation.cpp		relation.cpp
relation.hpp		relation.hpp
scope.cpp		scope.cpp
scope.hpp		scope.hpp
term_type.cpp		term_type.cpp
term_type.hpp		term_type.hpp

FlyingJester/EmeraldC

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Emerald C

What is Emerald C?

How Emerald C Generates Code

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