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all: remove init interpretation during IR construction

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The interp package does a much better job at interpretation, and is
implemented as a pass on the IR which makes it much easier to compose.
Also, the implementation works much better as it is based on LLVM IR
instead of Go SSA.
This commit is contained in:
Ayke van Laethem
2019-02-09 13:31:51 +01:00
committed by Ron Evans
parent da345e8723
commit 92d9b780b5
6 changed files with 46 additions and 917 deletions
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compiler/interface.go
+8 -19
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@@ -22,28 +22,17 @@ import (
// value field.
//
// An interface value is a {typecode, value} tuple, or {i16, i8*} to be exact.
func (c *Compiler) parseMakeInterface(val llvm.Value, typ types.Type, global string, pos token.Pos) (llvm.Value, error) {
func (c *Compiler) parseMakeInterface(val llvm.Value, typ types.Type, pos token.Pos) (llvm.Value, error) {
var itfValue llvm.Value
size := c.targetData.TypeAllocSize(val.Type())
if size > c.targetData.TypeAllocSize(c.i8ptrType) {
if global != "" {
// Allocate in a global variable.
global := llvm.AddGlobal(c.mod, val.Type(), global+"$itfvalue")
global.SetInitializer(val)
global.SetLinkage(llvm.InternalLinkage)
global.SetGlobalConstant(true)
zero := llvm.ConstInt(c.ctx.Int32Type(), 0, false)
itfValueRaw := llvm.ConstInBoundsGEP(global, []llvm.Value{zero, zero})
itfValue = llvm.ConstBitCast(itfValueRaw, c.i8ptrType)
} else {
// Allocate on the heap and put a pointer in the interface.
// TODO: escape analysis.
sizeValue := llvm.ConstInt(c.uintptrType, size, false)
alloc := c.createRuntimeCall("alloc", []llvm.Value{sizeValue}, "makeinterface.alloc")
itfValueCast := c.builder.CreateBitCast(alloc, llvm.PointerType(val.Type(), 0), "makeinterface.cast.value")
c.builder.CreateStore(val, itfValueCast)
itfValue = c.builder.CreateBitCast(itfValueCast, c.i8ptrType, "makeinterface.cast.i8ptr")
}
// Allocate on the heap and put a pointer in the interface.
// TODO: escape analysis.
sizeValue := llvm.ConstInt(c.uintptrType, size, false)
alloc := c.createRuntimeCall("alloc", []llvm.Value{sizeValue}, "makeinterface.alloc")
itfValueCast := c.builder.CreateBitCast(alloc, llvm.PointerType(val.Type(), 0), "makeinterface.cast.value")
c.builder.CreateStore(val, itfValueCast)
itfValue = c.builder.CreateBitCast(itfValueCast, c.i8ptrType, "makeinterface.cast.i8ptr")
} else if size == 0 {
itfValue = llvm.ConstPointerNull(c.i8ptrType)
} else {