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compiler: Implement initializers for arrays in global structs

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This commit is contained in:
Ayke van Laethem
2018-05-05 18:30:58 +02:00
parent db8b6c6900
commit 84b45a33f1
1 changed files with 24 additions and 7 deletions
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tgo.go
+24 -7
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@@ -471,14 +471,13 @@ func (c *Compiler) parseInitFunc(frame *Frame, f *ssa.Function) error {
for _, instr := range block.Instrs {
var err error
switch instr := instr.(type) {
case *ssa.Convert:
// ignore: CGo pointer conversion
case *ssa.Return:
case *ssa.Call, *ssa.Return:
err = c.parseInstr(frame, instr)
case *ssa.FieldAddr:
// ignore
case *ssa.Convert:
// Ignore: CGo pointer conversion.
case *ssa.FieldAddr, *ssa.IndexAddr:
// Ignore: handled below with *ssa.Store.
case *ssa.Store:
var llvmAddr llvm.Value
switch addr := instr.Addr.(type) {
case *ssa.Global:
// Regular store, like a global int variable.
@@ -491,7 +490,7 @@ func (c *Compiler) parseInitFunc(frame *Frame, f *ssa.Function) error {
return err
}
fullName := pkgPrefix(addr.Pkg) + "." + addr.Name()
llvmAddr = c.mod.NamedGlobal(fullName)
llvmAddr := c.mod.NamedGlobal(fullName)
llvmAddr.SetInitializer(val)
case *ssa.FieldAddr:
// Initialize field of a global struct.
@@ -508,6 +507,24 @@ func (c *Compiler) parseInitFunc(frame *Frame, f *ssa.Function) error {
llvmValue := llvmAddr.Initializer()
llvmValue = c.builder.CreateInsertValue(llvmValue, val, addr.Field, "")
llvmAddr.SetInitializer(llvmValue)
case *ssa.IndexAddr:
val, err := c.parseExpr(frame, instr.Val)
if err != nil {
return err
}
constIndex := addr.Index.(*ssa.Const)
index, exact := constant.Int64Val(constIndex.Value)
if !exact {
return errors.New("could not get store index: " + constIndex.Value.ExactString())
}
fieldAddr := addr.X.(*ssa.FieldAddr)
global := fieldAddr.X.(*ssa.Global)
llvmAddr := c.mod.NamedGlobal(pkgPrefix(global.Pkg) + "." + global.Name())
llvmValue := c.mod.NamedGlobal(pkgPrefix(global.Pkg) + "." + global.Name()).Initializer()
llvmFieldValue := c.builder.CreateExtractValue(llvmValue, fieldAddr.Field, "")
llvmFieldValue = c.builder.CreateInsertValue(llvmFieldValue, val, int(index), "")
llvmValue = c.builder.CreateInsertValue(llvmValue, llvmFieldValue, fieldAddr.Field, "")
llvmAddr.SetInitializer(llvmValue)
default:
return errors.New("unknown init store: " + fmt.Sprintf("%#v", addr))
}