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added if control structure

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This commit is contained in:
Marc Zinnschlag 2010-06-30 19:58:25 +02:00
parent 73f9436ed9
commit 69342f320d
9 changed files with 366 additions and 3 deletions
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50
components/compiler/generator.cpp
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@ -175,6 +175,26 @@ namespace
{
code.push_back (segment5 (23));
}
void opJumpForward (Compiler::Generator::CodeContainer& code, int offset)
{
code.push_back (segment0 (1, offset));
}
void opJumpBackward (Compiler::Generator::CodeContainer& code, int offset)
{
code.push_back (segment0 (2, offset));
}
void opSkipOnZero (Compiler::Generator::CodeContainer& code)
{
code.push_back (segment5 (24));
}
void opSkipOnNonZero (Compiler::Generator::CodeContainer& code)
{
code.push_back (segment5 (25));
}
}
namespace Compiler
@ -389,6 +409,36 @@ namespace Compiler
assert (0);
}
}
void jump (CodeContainer& code, int offset)
{
if (offset>0)
opJumpForward (code, offset);
else if (offset<0)
opJumpBackward (code, offset);
else
throw std::logic_error ("inifite loop");
}
void jumpOnZero (CodeContainer& code, int offset)
{
opSkipOnNonZero (code);
if (offset<0)
--offset; // compensate for skip instruction
jump (code, offset);
}
void jumpOnNonZero (CodeContainer& code, int offset)
{
opSkipOnZero (code);
if (offset<0)
--offset; // compensate for skip instruction
jump (code, offset);
}
}
}