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LibJS: Make basic block size customizable

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And keep the default 4 KiB for the code generator.
This commit is contained in:
Ali Mohammad Pur 2021-06-12 20:36:39 +04:30 • committed by Ali Mohammad Pur
parent f7f88adc78
commit e73b142a97
2 changed files with 7 additions and 6 deletions
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8
Userland/Libraries/LibJS/Bytecode/BasicBlock.cpp
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@ -11,18 +11,18 @@
namespace JS::Bytecode {
NonnullOwnPtr<BasicBlock> BasicBlock::create(String name)
NonnullOwnPtr<BasicBlock> BasicBlock::create(String name, size_t size)
{
return adopt_own(*new BasicBlock(move(name)));
return adopt_own(*new BasicBlock(move(name), max(size, static_cast<size_t>(4 * KiB))));
}
BasicBlock::BasicBlock(String name)
BasicBlock::BasicBlock(String name, size_t size)
: m_name(move(name))
{
// FIXME: This is not the smartest solution ever. Find something cleverer!
// The main issue we're working around here is that we don't want pointers into the bytecode stream to become invalidated
// during code generation due to dynamic buffer resizing. Otherwise we could just use a Vector.
m_buffer_capacity = 4 * KiB;
m_buffer_capacity = size;
m_buffer = (u8*)mmap(nullptr, m_buffer_capacity, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
VERIFY(m_buffer != MAP_FAILED);
}