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interp: add new compile-time package initialization interpreter

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This interpreter currently complements the Go SSA level interpreter. It
may stay complementary or may be the only interpreter in the future.

This interpreter is experimental and not yet finished (there are known
bugs!) so it is disabled by default. It can be enabled by passing the
-initinterp flag.

The goal is to be able to run all initializations at compile time except
for the ones having side effects. This mostly works except perhaps for a
few edge cases.

In the future, this interpeter may be used to actually run regular Go
code, perhaps in a shell.
This commit is contained in:
Ayke van Laethem
2018-10-31 10:43:29 +01:00
parent f900d3f9d5
commit bb3d05169d
14 changed files with 1591 additions and 36 deletions
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compiler/compiler.go
+17 -9
View File
@@ -31,12 +31,13 @@ func init() {
// Configure the compiler.
type Config struct {
Triple string // LLVM target triple, e.g. x86_64-unknown-linux-gnu (empty string means default)
DumpSSA bool // dump Go SSA, for compiler debugging
Debug bool // add debug symbols for gdb
RootDir string // GOROOT for TinyGo
GOPATH string // GOPATH, like `go env GOPATH`
BuildTags []string // build tags for TinyGo (empty means {runtime.GOOS/runtime.GOARCH})
Triple string // LLVM target triple, e.g. x86_64-unknown-linux-gnu (empty string means default)
DumpSSA bool // dump Go SSA, for compiler debugging
Debug bool // add debug symbols for gdb
RootDir string // GOROOT for TinyGo
GOPATH string // GOPATH, like `go env GOPATH`
BuildTags []string // build tags for TinyGo (empty means {runtime.GOOS/runtime.GOARCH})
InitInterp bool // use new init interpretation, meaning the old one is disabled
}
type Compiler struct {
@@ -164,6 +165,11 @@ func (c *Compiler) Module() llvm.Module {
return c.mod
}
// Return the LLVM target data object. Only valid after a successful compile.
func (c *Compiler) TargetData() llvm.TargetData {
return c.targetData
}
// Compile the given package path or .go file path. Return an error when this
// fails (in any stage).
func (c *Compiler) Compile(mainPath string) error {
@@ -295,9 +301,11 @@ func (c *Compiler) Compile(mainPath string) error {
// continues at runtime).
// This should only happen when it hits a function call or the end
// of the block, ideally.
err := c.ir.Interpret(frame.fn.Blocks[0], c.DumpSSA)
if err != nil {
return err
if !c.InitInterp {
err := c.ir.Interpret(frame.fn.Blocks[0], c.DumpSSA)
if err != nil {
return err
}
}
err = c.parseFunc(frame)
if err != nil {