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Translate bootstrapping main from C to LLVM IR

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This avoids needing a C compiler for every platform.
This commit is contained in:
Ayke van Laethem
2018-06-03 17:32:10 +02:00
parent a9bbed2f6c
commit 588910792d
4 changed files with 53 additions and 46 deletions
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tgo.go
+23 -15
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@@ -199,8 +199,12 @@ func (c *Compiler) Parse(mainPath string, buildTags []string) error {
// After all packages are imported, add a synthetic initializer function
// that calls the initializer of each package.
initType := llvm.FunctionType(llvm.VoidType(), nil, false)
initFn := llvm.AddFunction(c.mod, "runtime.initAll", initType)
initFn := c.mod.NamedFunction("runtime.initAll")
if initFn.IsNil() {
initType := llvm.FunctionType(llvm.VoidType(), nil, false)
initFn = llvm.AddFunction(c.mod, "runtime.initAll", initType)
}
initFn.SetLinkage(llvm.PrivateLinkage)
block := c.ctx.AddBasicBlock(initFn, "entry")
c.builder.SetInsertPointAtEnd(block)
for _, fn := range c.initFuncs {
@@ -208,6 +212,11 @@ func (c *Compiler) Parse(mainPath string, buildTags []string) error {
}
c.builder.CreateRetVoid()
// Set functions referenced in runtime.ll to internal linkage, to improve
// optimization (hopefully).
main := c.mod.NamedFunction("main.main")
main.SetLinkage(llvm.PrivateLinkage)
return nil
}
@@ -518,6 +527,7 @@ func (c *Compiler) parseFuncDecl(f *ssa.Function) (*Frame, error) {
// Special function parser for generated package initializers (which also
// initializes global variables).
func (c *Compiler) parseInitFunc(frame *Frame, f *ssa.Function) error {
frame.llvmFn.SetLinkage(llvm.PrivateLinkage)
llvmBlock := c.ctx.AddBasicBlock(frame.llvmFn, "entry")
c.builder.SetInsertPointAtEnd(llvmBlock)
@@ -605,10 +615,7 @@ func (c *Compiler) parseInitFunc(frame *Frame, f *ssa.Function) error {
}
func (c *Compiler) parseFunc(frame *Frame, f *ssa.Function) error {
if frame.llvmFn.Name() != "main.main" {
// This function is only used from within Go.
frame.llvmFn.SetLinkage(llvm.PrivateLinkage)
}
frame.llvmFn.SetLinkage(llvm.PrivateLinkage)
// Pre-create all basic blocks in the function.
for _, block := range f.DomPreorder() {
@@ -1341,15 +1348,7 @@ func Compile(pkgName, runtimePath, outpath, target string, printIR bool) error {
return err
}
parseErr := c.Parse(pkgName, buildTags)
if printIR {
fmt.Println(c.IR())
}
if parseErr != nil {
return parseErr
}
// Add C runtime.
// Add C/LLVM runtime.
runtime, err := llvm.ParseBitcodeFile(runtimePath)
if err != nil {
return err
@@ -1359,6 +1358,15 @@ func Compile(pkgName, runtimePath, outpath, target string, printIR bool) error {
return err
}
// Compile Go code to IR.
parseErr := c.Parse(pkgName, buildTags)
if printIR {
fmt.Println(c.IR())
}
if parseErr != nil {
return parseErr
}
c.ApplyFunctionSections() // -ffunction-sections
if err := c.Verify(); err != nil {